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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1211.0798
|
Marco Matone
|
Alon E. Faraggi and Marco Matone
|
Energy Quantisation and Time Parameterisation
|
11 pages. The main addition concerns a discussion on the variational
principle in the case of discrete energy spectra (Jacobi's Theorem).
References added
|
Eur. Phys. J. C 74 (2014) 2694
|
10.1140/epjc/s10052-013-2694-1
|
LTH-961
|
hep-th quant-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that if space is compact, then trajectories cannot be defined in the
framework of quantum Hamilton--Jacobi equation. The starting point is the
simple observation that when the energy is quantized it is not possible to make
variations with respect to the energy, and the time parameterisation
t-t_0=\partial_E S_0, implied by Jacobi's theorem and that leads to group
velocity, is ill defined. It should be stressed that this follows directly form
the quantum HJ equation without any axiomatic assumption concerning the
standard formulation of quantum mechanics. This provides a stringent connection
between the quantum HJ equation and the Copenhagen interpretation. Together
with tunneling and the energy quantization theorem for confining potentials,
formulated in the framework of quantum HJ equation, it leads to the main
features of the axioms of quantum mechanics from a unique geometrical
principle. Similarly to the case of the classical HJ equation, this fixes its
quantum analog by requiring that there exist point transformations, rather than
canonical ones, leading to the trivial hamiltonian. This is equivalent to a
basic cocycle condition on the states. Such a cocycle condition can be
implemented on compact spaces, so that continuous energy spectra are allowed
only as a limiting case. Remarkably, a compact space would also imply that the
Dirac and von Neumann formulations of quantum mechanics essentially coincide.
We suggest that there is a definition of time parameterisation leading to
trajectories in the context of the quantum HJ equation having the probabilistic
interpretation of the Copenhagen School.
|
[
{
"created": "Mon, 5 Nov 2012 09:20:15 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Dec 2013 15:24:33 GMT",
"version": "v2"
}
] |
2014-01-24
|
[
[
"Faraggi",
"Alon E.",
""
],
[
"Matone",
"Marco",
""
]
] |
We show that if space is compact, then trajectories cannot be defined in the framework of quantum Hamilton--Jacobi equation. The starting point is the simple observation that when the energy is quantized it is not possible to make variations with respect to the energy, and the time parameterisation t-t_0=\partial_E S_0, implied by Jacobi's theorem and that leads to group velocity, is ill defined. It should be stressed that this follows directly form the quantum HJ equation without any axiomatic assumption concerning the standard formulation of quantum mechanics. This provides a stringent connection between the quantum HJ equation and the Copenhagen interpretation. Together with tunneling and the energy quantization theorem for confining potentials, formulated in the framework of quantum HJ equation, it leads to the main features of the axioms of quantum mechanics from a unique geometrical principle. Similarly to the case of the classical HJ equation, this fixes its quantum analog by requiring that there exist point transformations, rather than canonical ones, leading to the trivial hamiltonian. This is equivalent to a basic cocycle condition on the states. Such a cocycle condition can be implemented on compact spaces, so that continuous energy spectra are allowed only as a limiting case. Remarkably, a compact space would also imply that the Dirac and von Neumann formulations of quantum mechanics essentially coincide. We suggest that there is a definition of time parameterisation leading to trajectories in the context of the quantum HJ equation having the probabilistic interpretation of the Copenhagen School.
|
hep-th/0207165
|
Soumitra SenGupta
|
Biswarup Mukhopadhyaya, Somasri Sen, Soumitra SenGupta, Saurabh Sur
|
Parity violation in four and higher dimensional spacetime with torsion
|
13 Pages, Latex, Title changed and thoroughly revised. To appear in
Eur.Phys.J.C
|
Eur.Phys.J. C35 (2004) 129-135
|
10.1140/epjc/s2004-01759-7
| null |
hep-th
| null |
The possibility of parity violation in a gravitational theory with torsion is
extensively explored in four and higher dimensions. In the former case,we have
listed our conclusions on when and whether parity ceases to be conserved, with
both two-and three-index antisymmetry of the torsion field. In the latter, the
bulk spacetime is assumed to have torsion, and the survival of parity-violating
terms in the four dimensional effective action is studied, using the
compactification schemes proposed by Arkani-Hamed-Dimopoulos-Dvali and
Randall-Sundrum. An interesting conclusion is that the torsion-axion duality
arising in a stringy scenario via the second rank antisymmetric Kalb-Ramond
field leads to conservation of parity in the gravity sector in any dimension.
However, parity-violating interactions do appear for spin 1/2 fermions in such
theories, which can have crucial phenomenological implications.
|
[
{
"created": "Thu, 18 Jul 2002 13:28:50 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Apr 2003 11:45:20 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Apr 2004 05:56:51 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Mukhopadhyaya",
"Biswarup",
""
],
[
"Sen",
"Somasri",
""
],
[
"SenGupta",
"Soumitra",
""
],
[
"Sur",
"Saurabh",
""
]
] |
The possibility of parity violation in a gravitational theory with torsion is extensively explored in four and higher dimensions. In the former case,we have listed our conclusions on when and whether parity ceases to be conserved, with both two-and three-index antisymmetry of the torsion field. In the latter, the bulk spacetime is assumed to have torsion, and the survival of parity-violating terms in the four dimensional effective action is studied, using the compactification schemes proposed by Arkani-Hamed-Dimopoulos-Dvali and Randall-Sundrum. An interesting conclusion is that the torsion-axion duality arising in a stringy scenario via the second rank antisymmetric Kalb-Ramond field leads to conservation of parity in the gravity sector in any dimension. However, parity-violating interactions do appear for spin 1/2 fermions in such theories, which can have crucial phenomenological implications.
|
1611.03948
|
Kenji Mohri
|
Kenji Mohri
|
Algebra of Kodaira-Spencer Gravity and Deformation of Calabi-Yau
Manifold
|
preprint of an article published in Rev.Math.Phys. (C) World
Scientific Publishing Company
|
Reviews in Mathematical Physics vol.29, No.3 (2017) 1750010 (23
pages)
|
10.1142/S0129055X17500106
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the algebraic structure of the configuration space of the
Kodaira-Spencer gravity theory on a Calabi-Yau threefold. We then investigate
the deformation problem of the Kodaira-Spencer gravity at the classical level
using the algebraic tools obtained here.
|
[
{
"created": "Sat, 12 Nov 2016 03:47:08 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Feb 2017 04:48:38 GMT",
"version": "v2"
}
] |
2017-02-24
|
[
[
"Mohri",
"Kenji",
""
]
] |
We study the algebraic structure of the configuration space of the Kodaira-Spencer gravity theory on a Calabi-Yau threefold. We then investigate the deformation problem of the Kodaira-Spencer gravity at the classical level using the algebraic tools obtained here.
|
1505.07107
|
Raffaele Tito D'Agnolo
|
Raffaele Tito D'Agnolo and Joshua T. Ruderman
|
Forbidden Dark Matter
|
6 Pages, 3 Figures; Version published in PRL
|
Phys. Rev. Lett. 115, 061301 (2015)
|
10.1103/PhysRevLett.115.061301
| null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Dark Matter (DM) may be a thermal relic that annihilates into heavier states
in the early Universe. This Forbidden DM framework accommodates a wide range of
DM masses from keV to weak scales. An exponential hierarchy between the DM mass
and the weak scale follows from the exponential suppression of the thermally
averaged cross section. Stringent constraints from the cosmic microwave
background are evaded because annihilations turn off at late times. We provide
an example where DM annihilates into dark photons, which is testable through
large DM self-interactions and direct detection.
|
[
{
"created": "Tue, 26 May 2015 20:00:21 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Aug 2015 01:58:57 GMT",
"version": "v2"
}
] |
2015-08-13
|
[
[
"D'Agnolo",
"Raffaele Tito",
""
],
[
"Ruderman",
"Joshua T.",
""
]
] |
Dark Matter (DM) may be a thermal relic that annihilates into heavier states in the early Universe. This Forbidden DM framework accommodates a wide range of DM masses from keV to weak scales. An exponential hierarchy between the DM mass and the weak scale follows from the exponential suppression of the thermally averaged cross section. Stringent constraints from the cosmic microwave background are evaded because annihilations turn off at late times. We provide an example where DM annihilates into dark photons, which is testable through large DM self-interactions and direct detection.
|
1810.05393
|
Nikolaos Mavromatos
|
John Ellis, Nick E. Mavromatos, Dimitri V. Nanopoulos
|
Constraining D-foam via the 21-cm Line
|
15 pages revetex; possible minor text overlap with arXiv:1706.04080
[gr-qc] and arXiv:1712.03395 [hep-ph]
|
Phys. Rev. D 99, 015031 (2019)
|
10.1103/PhysRevD.99.015031
|
CERN-TH-2018-217,KCL-PH-TH/2018-45,ACT-03-18, MI-TH-18-183
|
gr-qc astro-ph.CO hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We have suggested earlier that D-particles, which are stringy space-time
defects predicted in brane-inspired models of the Universe, might constitute a
component of dark matter, and that they might contribute to the masses of
singlet fermions that could provide another component. Interactions of the
quantum-fluctuating D-particles with matter induce vector forces that are
mediated by a massless effective U(1) gauge field, the "D-photon", which is
distinct from the ordinary photon and has different properties from dark
photons. We discuss the form of interactions of D-matter with conventional
matter induced by D-photon exchange and calculate their strength, which depends
on the density of D-particles. Observations of the hydrogen 21~cm line at
redshifts >= 15 can constrain these interactions and the density of D-matter in
the early Universe.
|
[
{
"created": "Fri, 12 Oct 2018 08:09:59 GMT",
"version": "v1"
}
] |
2019-01-30
|
[
[
"Ellis",
"John",
""
],
[
"Mavromatos",
"Nick E.",
""
],
[
"Nanopoulos",
"Dimitri V.",
""
]
] |
We have suggested earlier that D-particles, which are stringy space-time defects predicted in brane-inspired models of the Universe, might constitute a component of dark matter, and that they might contribute to the masses of singlet fermions that could provide another component. Interactions of the quantum-fluctuating D-particles with matter induce vector forces that are mediated by a massless effective U(1) gauge field, the "D-photon", which is distinct from the ordinary photon and has different properties from dark photons. We discuss the form of interactions of D-matter with conventional matter induced by D-photon exchange and calculate their strength, which depends on the density of D-particles. Observations of the hydrogen 21~cm line at redshifts >= 15 can constrain these interactions and the density of D-matter in the early Universe.
|
1205.6805
|
Raphael Flauger
|
Sergei Dubovsky, Raphael Flauger, Victor Gorbenko
|
Solving the Simplest Theory of Quantum Gravity
|
32+4 pages, 1 figure, v2: typos fixed, published version
|
JHEP 1209 (2012) 133
|
10.1007/JHEP09(2012)133
| null |
hep-th gr-qc hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We solve what is quite likely the simplest model of quantum gravity, the
worldsheet theory of an infinitely long, free bosonic string in Minkowski
space. Contrary to naive expectations, this theory is non-trivial. We
illustrate this by constructing its exact factorizable S-matrix. Despite its
simplicity, the theory exhibits many of the salient features expected from more
mature quantum gravity models, including the absence of local off-shell
observables, a minimal length, a maximum achievable (Hagedorn) temperature, as
well as (integrable relatives of) black holes. All these properties follow from
the exact S-matrix. We show that the complete finite volume spectrum can be
reconstructed analytically from this S-matrix with the help of the
thermodynamic Bethe Ansatz. We argue that considered as a UV complete
relativistic two-dimensional quantum field theory the model exhibits a new type
of renormalization group flow behavior, "asymptotic fragility". Asymptotically
fragile flows do not originate from a UV fixed point.
|
[
{
"created": "Wed, 30 May 2012 20:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2013 21:01:33 GMT",
"version": "v2"
}
] |
2013-02-18
|
[
[
"Dubovsky",
"Sergei",
""
],
[
"Flauger",
"Raphael",
""
],
[
"Gorbenko",
"Victor",
""
]
] |
We solve what is quite likely the simplest model of quantum gravity, the worldsheet theory of an infinitely long, free bosonic string in Minkowski space. Contrary to naive expectations, this theory is non-trivial. We illustrate this by constructing its exact factorizable S-matrix. Despite its simplicity, the theory exhibits many of the salient features expected from more mature quantum gravity models, including the absence of local off-shell observables, a minimal length, a maximum achievable (Hagedorn) temperature, as well as (integrable relatives of) black holes. All these properties follow from the exact S-matrix. We show that the complete finite volume spectrum can be reconstructed analytically from this S-matrix with the help of the thermodynamic Bethe Ansatz. We argue that considered as a UV complete relativistic two-dimensional quantum field theory the model exhibits a new type of renormalization group flow behavior, "asymptotic fragility". Asymptotically fragile flows do not originate from a UV fixed point.
|
1612.05742
|
Steven Abel
|
Benedict Aaronson, Steven Abel, Eirini Mavroudi
|
On interpolations from SUSY to non-SUSY strings and their properties
|
21 pages, 5 figures, improved figure, background and appendix
|
Phys. Rev. D 95, 106001 (2017)
|
10.1103/PhysRevD.95.106001
|
IPPP/16/123
|
hep-th hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The interpolation from supersymmetric to non-supersymmetric heterotic
theories is studied, via the Scherk-Schwarz compactification of supersymmetric
6D theories to 4D. A general modular-invariant Scherk-Schwarz deformation is
deduced from the properties of the 6D theories at the endpoints, which
significantly extends previously known examples. This wider class of
non-supersymmetric 4D theories opens up new possibilities for model building.
The full one-loop cosmological constant of such theories is studied as a
function of compactification radius for a number of cases, and the following
interpolating configurations are found: two supersymmetric 6D theories related
by a T-duality transformation, with intermediate 4D maximum or minimum at the
string scale; a non-supersymmetric 6D theory interpolating to a supersymmetric
6D theory, with the 4D theory possibly having an AdS minimum; a "metastable"
non-supersymmetric 6D theory interpolating via a 4D theory to a supersymmetric
6D theory.
|
[
{
"created": "Sat, 17 Dec 2016 12:04:52 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Mar 2017 09:37:26 GMT",
"version": "v2"
}
] |
2017-05-10
|
[
[
"Aaronson",
"Benedict",
""
],
[
"Abel",
"Steven",
""
],
[
"Mavroudi",
"Eirini",
""
]
] |
The interpolation from supersymmetric to non-supersymmetric heterotic theories is studied, via the Scherk-Schwarz compactification of supersymmetric 6D theories to 4D. A general modular-invariant Scherk-Schwarz deformation is deduced from the properties of the 6D theories at the endpoints, which significantly extends previously known examples. This wider class of non-supersymmetric 4D theories opens up new possibilities for model building. The full one-loop cosmological constant of such theories is studied as a function of compactification radius for a number of cases, and the following interpolating configurations are found: two supersymmetric 6D theories related by a T-duality transformation, with intermediate 4D maximum or minimum at the string scale; a non-supersymmetric 6D theory interpolating to a supersymmetric 6D theory, with the 4D theory possibly having an AdS minimum; a "metastable" non-supersymmetric 6D theory interpolating via a 4D theory to a supersymmetric 6D theory.
|
hep-th/0205278
|
T. Padmanabhan
|
T.Padmanabhan
|
Is gravity an intrinsically quantum phenomenon? Dynamics of Gravity from
the Entropy of Spacetime and the Principle of Equivalence
|
12 pages; latex with style macros built-in; to appear in
Mod.Phys.Letts.A
|
Mod.Phys.Lett. A17 (2002) 1147-1158
|
10.1142/S0217732302007260
|
IUCAA preprint 23/2002
|
hep-th astro-ph gr-qc
| null |
The two surprising features of gravity are (a) the principle of equivalence
and (b) the connection between gravity and thermodynamics. Using principle of
equivalence and special relativity in the {\it local inertial frame}, one could
obtain the insight that gravity must possess a geometrical description. I show
that, using the same principle of equivalence, special relativity and quantum
theory in the {\it local Rindler frame} one can obtain the Einstein-Hilbert
action functional for gravity and thus the dynamics of the spacetime. This
approach, which essentially involves postulating that the horizon area must be
proportional to the entropy, uses the local Rindler frame as a natural
extension of the local inertial frame and leads to the interpretation that the
gravitational action represents the free energy of the spacetime geometry. As
an aside, one also obtains a natural explanation as to: (i) why the covariant
action for gravity contains second derivatives of the metric tensor and (ii)
why the gravitational coupling constant is positive. The analysis suggests that
gravity is intrinsically holographic and even intrinsically quantum mechanical.
|
[
{
"created": "Mon, 27 May 2002 12:09:07 GMT",
"version": "v1"
}
] |
2009-11-07
|
[
[
"Padmanabhan",
"T.",
""
]
] |
The two surprising features of gravity are (a) the principle of equivalence and (b) the connection between gravity and thermodynamics. Using principle of equivalence and special relativity in the {\it local inertial frame}, one could obtain the insight that gravity must possess a geometrical description. I show that, using the same principle of equivalence, special relativity and quantum theory in the {\it local Rindler frame} one can obtain the Einstein-Hilbert action functional for gravity and thus the dynamics of the spacetime. This approach, which essentially involves postulating that the horizon area must be proportional to the entropy, uses the local Rindler frame as a natural extension of the local inertial frame and leads to the interpretation that the gravitational action represents the free energy of the spacetime geometry. As an aside, one also obtains a natural explanation as to: (i) why the covariant action for gravity contains second derivatives of the metric tensor and (ii) why the gravitational coupling constant is positive. The analysis suggests that gravity is intrinsically holographic and even intrinsically quantum mechanical.
|
2103.03618
|
Qiming Fu
|
Qi-Ming Fu, Li Zhao, and Qun-Ying Xie
|
Thick braneworld model in nonmetricity formulation of general relativity
and its stability
| null | null |
10.1140/epjc/s10052-021-09584-w
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we study the thick brane system in the so-called $f(Q)$
gravity, where the gravitational interaction was encoded by the nonmetricity
$Q$ like scalar curvature $R$ in general relativity. With a special choice of
$f(Q)=Q-b Q^n$, we find that the thick brane system can be solved analytically
with the first-order formalism, where the complicated second-order differential
equation is transformed to several first-order differential equations.
Moreover, the stability of the thick brane system under tensor perturbation is
also investigated. It is shown that the tachyonic states are absent and the
graviton zero mode can be localized on the brane. Thus, the four-dimensional
Newtonian potential can be recovered at low energy. Besides, the corrections of
the massive graviton Kaluza-Klein modes to the Newtonian potential are also
analyzed briefly.
|
[
{
"created": "Fri, 5 Mar 2021 11:42:35 GMT",
"version": "v1"
}
] |
2021-10-27
|
[
[
"Fu",
"Qi-Ming",
""
],
[
"Zhao",
"Li",
""
],
[
"Xie",
"Qun-Ying",
""
]
] |
In this paper, we study the thick brane system in the so-called $f(Q)$ gravity, where the gravitational interaction was encoded by the nonmetricity $Q$ like scalar curvature $R$ in general relativity. With a special choice of $f(Q)=Q-b Q^n$, we find that the thick brane system can be solved analytically with the first-order formalism, where the complicated second-order differential equation is transformed to several first-order differential equations. Moreover, the stability of the thick brane system under tensor perturbation is also investigated. It is shown that the tachyonic states are absent and the graviton zero mode can be localized on the brane. Thus, the four-dimensional Newtonian potential can be recovered at low energy. Besides, the corrections of the massive graviton Kaluza-Klein modes to the Newtonian potential are also analyzed briefly.
|
0907.3872
|
Antonio Lopez Maroto
|
A. de la Cruz-Dombriz, A. Dobado, A. L. Maroto
|
Black Holes in f(R) theories
|
19 pages, 9 figures. New comments and figures included. Accepted for
publication in Phys. Rev. D
|
Phys.Rev.D80:124011,2009
|
10.1103/PhysRevD.80.124011
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the context of $f(R)$ theories of gravity, we address the problem of
finding static and spherically symmetric black hole solutions. Several aspects
of constant curvature solutions with and without electric charge are discussed.
We also study the general case (without imposing constant curvature). Following
a perturbative approach around the Einstein-Hilbert action, it is found that
only solutions of the Schwarzschild-(anti) de Sitter type are present up to
second order in perturbations. Explicit expressions for the effective
cosmological constant are obtained in terms of the $f(R)$ function. Finally, we
have considered the thermodynamics of black holes in anti-de Sitter space-time
and found that this kind of solutions can only exist provided the theory
satisfies $R_0+f(R_0)<0$. Interestingly, this expression is related to the
condition which guarantees the positivity of the effective Newton's constant in
this type of theories. In addition, it also ensures that the thermodynamical
properties in $f(R)$ gravities are qualitatively similar to those of standard
General Relativity.
|
[
{
"created": "Wed, 22 Jul 2009 16:05:13 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Nov 2009 17:13:03 GMT",
"version": "v2"
}
] |
2010-01-15
|
[
[
"de la Cruz-Dombriz",
"A.",
""
],
[
"Dobado",
"A.",
""
],
[
"Maroto",
"A. L.",
""
]
] |
In the context of $f(R)$ theories of gravity, we address the problem of finding static and spherically symmetric black hole solutions. Several aspects of constant curvature solutions with and without electric charge are discussed. We also study the general case (without imposing constant curvature). Following a perturbative approach around the Einstein-Hilbert action, it is found that only solutions of the Schwarzschild-(anti) de Sitter type are present up to second order in perturbations. Explicit expressions for the effective cosmological constant are obtained in terms of the $f(R)$ function. Finally, we have considered the thermodynamics of black holes in anti-de Sitter space-time and found that this kind of solutions can only exist provided the theory satisfies $R_0+f(R_0)<0$. Interestingly, this expression is related to the condition which guarantees the positivity of the effective Newton's constant in this type of theories. In addition, it also ensures that the thermodynamical properties in $f(R)$ gravities are qualitatively similar to those of standard General Relativity.
|
1006.3199
|
Pavlos Pasipoularides
|
G. Koutsoumbas and P. Pasipoularides
|
Black hole solutions in Horava-Lifshitz Gravity with cubic terms
|
25 pages, 3 figures, accepted in Phys. Rev. D
|
Phys.Rev.D82:044046,2010
|
10.1103/PhysRevD.82.044046
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study four dimensional non-projectable Horava-Lifshitz type gravity, in
the case of an action with terms, cubic in curvature. For special choices of
the free parameters of the model, we obtain two new analytic black hole
solutions which exhibit the standard Schwarzschild asymptotic behavior in the
large distance limit. The effect of cubic terms in the short range behavior of
the black hole solutions is discussed.
|
[
{
"created": "Wed, 16 Jun 2010 13:07:36 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jun 2010 13:56:51 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Aug 2010 10:13:59 GMT",
"version": "v3"
}
] |
2014-11-21
|
[
[
"Koutsoumbas",
"G.",
""
],
[
"Pasipoularides",
"P.",
""
]
] |
We study four dimensional non-projectable Horava-Lifshitz type gravity, in the case of an action with terms, cubic in curvature. For special choices of the free parameters of the model, we obtain two new analytic black hole solutions which exhibit the standard Schwarzschild asymptotic behavior in the large distance limit. The effect of cubic terms in the short range behavior of the black hole solutions is discussed.
|
hep-ph/9405312
|
Neven
|
Neven Bilic
|
Supercooling of the quark-gluon plasma
|
10 pages, UCT-TP-212/94
| null | null | null |
hep-ph
| null |
Transition from the quark-gluon (QG) plasma to a hadronic gas is studied in
the framework of the relativistic combustion theory. The calculations reveal
that the QG phase must be in a strongly supercooled state. The stability of
this solution with respect to minor modifications is investigated. In
particular the effect of an admixture of hadronic matter in the QG phase is
considered in detail.
|
[
{
"created": "Tue, 17 May 1994 07:04:37 GMT",
"version": "v1"
}
] |
2009-09-25
|
[
[
"Bilic",
"Neven",
""
]
] |
Transition from the quark-gluon (QG) plasma to a hadronic gas is studied in the framework of the relativistic combustion theory. The calculations reveal that the QG phase must be in a strongly supercooled state. The stability of this solution with respect to minor modifications is investigated. In particular the effect of an admixture of hadronic matter in the QG phase is considered in detail.
|
hep-ph/0703184
|
Ismail Turan
|
Mariana Frank and Ismail Turan (Concordia University, Montreal)
|
CP Asymmetry in Charged Higgs Decays in MSSM
|
25 pages, 9 figures. Discussion about charged Higgs observability
added, typos corrected, accepted for publication in PRD
|
Phys.Rev.D76:016001,2007
|
10.1103/PhysRevD.76.016001
|
CUMQ/HEP 143
|
hep-ph
| null |
We discuss and compare the charge-parity (CP) asymmetry in the charged Higgs
boson decays H -> \bar{u}_i d_j for the second and third generation quarks in
the minimal supersymmetric standard model. As part of the analysis, we derive
some general analytical formulas for the imaginary parts of two-point and
three-point scalar one-loop integrals and use them for calculating vectorial
and tensorial type integrals needed for the problem under consideration. We
find that, even though each decay mode has a potential to yield a CP asymmetry
larger than 10%, further analysis based on the number of required charged Higgs
events at colliders favors the \bar{t}b, \bar{c}b, and \bar{c}s channels, whose
asymmetry could reach 10-15% in certain parts of the parameter space.
|
[
{
"created": "Fri, 16 Mar 2007 20:03:37 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jun 2007 05:07:21 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Frank",
"Mariana",
"",
"Concordia University, Montreal"
],
[
"Turan",
"Ismail",
"",
"Concordia University, Montreal"
]
] |
We discuss and compare the charge-parity (CP) asymmetry in the charged Higgs boson decays H -> \bar{u}_i d_j for the second and third generation quarks in the minimal supersymmetric standard model. As part of the analysis, we derive some general analytical formulas for the imaginary parts of two-point and three-point scalar one-loop integrals and use them for calculating vectorial and tensorial type integrals needed for the problem under consideration. We find that, even though each decay mode has a potential to yield a CP asymmetry larger than 10%, further analysis based on the number of required charged Higgs events at colliders favors the \bar{t}b, \bar{c}b, and \bar{c}s channels, whose asymmetry could reach 10-15% in certain parts of the parameter space.
|
hep-ph/0106120
|
Michael Kraemer
|
Michael Kr\"amer
|
Quarkonium Production at High-Energy Colliders
|
61 pages, 20 figures. To be published in Progress in Particle and
Nuclear Physics, Vol. 47, issue 1
|
Prog.Part.Nucl.Phys.47:141-201,2001
|
10.1016/S0146-6410(01)00154-5
|
Edinburgh 2001/06
|
hep-ph
| null |
The theoretical description of heavy quarkonium production at high-energy
p-pbar and e-p colliders is reviewed. Predictions based on non-relativistic QCD
factorisation are confronted with recent charmonium and bottomonium data from
the Tevatron and HERA. Potential shortcomings of the present theoretical
analyses are discussed, and the prospects for quarkonium physics at the
upgraded Tevatron and HERA colliders and at the LHC are summarised.
|
[
{
"created": "Tue, 12 Jun 2001 11:29:42 GMT",
"version": "v1"
}
] |
2009-04-13
|
[
[
"Krämer",
"Michael",
""
]
] |
The theoretical description of heavy quarkonium production at high-energy p-pbar and e-p colliders is reviewed. Predictions based on non-relativistic QCD factorisation are confronted with recent charmonium and bottomonium data from the Tevatron and HERA. Potential shortcomings of the present theoretical analyses are discussed, and the prospects for quarkonium physics at the upgraded Tevatron and HERA colliders and at the LHC are summarised.
|
1106.0611
|
Igor Samsonov
|
Dmitry V. Belyaev, Igor B. Samsonov
|
Bi-harmonic superspace for N=4 d=4 super Yang-Mills
|
1+19 pages; minor corrections, references added
| null |
10.1007/JHEP09(2011)056
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop N=4 d=4 bi-harmonic superspace and use it to derive a novel form
for the low-energy effective action in N=4 super Yang-Mills theory. We solve
the N=4 supergauge constraints in this superspace in terms of analytic
superfields. Using these superfields, we construct a simple functional that
respects N=4 supersymmetry and scale invariance. In components, it reproduces
all on-shell terms in the four-derivative part of the N=4 SYM effective action;
in particular, the F^4/X^4 and Wess-Zumino terms. The latter comes out in a
novel SO(3) x SO(3)-invariant form.
|
[
{
"created": "Fri, 3 Jun 2011 11:24:21 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Jun 2011 09:21:22 GMT",
"version": "v2"
}
] |
2015-05-28
|
[
[
"Belyaev",
"Dmitry V.",
""
],
[
"Samsonov",
"Igor B.",
""
]
] |
We develop N=4 d=4 bi-harmonic superspace and use it to derive a novel form for the low-energy effective action in N=4 super Yang-Mills theory. We solve the N=4 supergauge constraints in this superspace in terms of analytic superfields. Using these superfields, we construct a simple functional that respects N=4 supersymmetry and scale invariance. In components, it reproduces all on-shell terms in the four-derivative part of the N=4 SYM effective action; in particular, the F^4/X^4 and Wess-Zumino terms. The latter comes out in a novel SO(3) x SO(3)-invariant form.
|
1612.01351
|
Gennady Lykasov I
|
S.J. Brodsky, V.A. Bednyakov, G.I. Lykasov, J. Smiesko, S. Tokar
|
The Physics of Heavy Quark Distributions in Hadrons: Collider Tests
|
74 pages, 31 figures. It is submitted and accepted for publishing in
the journal "Progress in Particle and Nuclear Physics"
| null |
10.1016/j.ppnp.2016.12.001
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present a review of the current understanding of the heavy quark
distributions in the nucleon and their impact on collider physics. The origin
of strange, charm and bottom quark pairs at high light-front (LF) momentum
fractions in hadron wave functions---the "intrinsic" quarks, is reviewed. The
determination of heavy-quark parton distribution functions (PDFs) is
particularly significant for the analysis of hard processes at LHC energies. We
show that a careful study of the inclusive production of open charm and the
production of $\gamma$/$Z$/$W$ particles, accompanied by the heavy jets at
large transverse momenta can give essential information on the intrinsic heavy
quark (IQ) distributions. We also focus on the theoretical predictions
concerning other observables which are very sensitive to the intrinsic charm
contribution to PDFs including Higgs production at high xf and novel fixed
target measurements which can be tested at the LHC.
|
[
{
"created": "Mon, 5 Dec 2016 13:45:46 GMT",
"version": "v1"
}
] |
2017-03-08
|
[
[
"Brodsky",
"S. J.",
""
],
[
"Bednyakov",
"V. A.",
""
],
[
"Lykasov",
"G. I.",
""
],
[
"Smiesko",
"J.",
""
],
[
"Tokar",
"S.",
""
]
] |
We present a review of the current understanding of the heavy quark distributions in the nucleon and their impact on collider physics. The origin of strange, charm and bottom quark pairs at high light-front (LF) momentum fractions in hadron wave functions---the "intrinsic" quarks, is reviewed. The determination of heavy-quark parton distribution functions (PDFs) is particularly significant for the analysis of hard processes at LHC energies. We show that a careful study of the inclusive production of open charm and the production of $\gamma$/$Z$/$W$ particles, accompanied by the heavy jets at large transverse momenta can give essential information on the intrinsic heavy quark (IQ) distributions. We also focus on the theoretical predictions concerning other observables which are very sensitive to the intrinsic charm contribution to PDFs including Higgs production at high xf and novel fixed target measurements which can be tested at the LHC.
|
hep-th/0405174
|
Mariano Cadoni
|
M. Cadoni
|
Horizons and the Thermal Harmonic Oscillator
|
Content changed, title slightly modified
|
Mod.Phys.Lett.A20:1503-1511,2005
|
10.1142/S0217732305017603
| null |
hep-th
| null |
We show that two-dimensional anti-de Sitter spacetime (AdS_2) can be put in
correspondence, holographically, both with the harmonic oscillator and the free
particle. When AdS_2 has an horizon the corresponding mechanical system is a
thermal harmonic oscillator at temperature given by the Hawking temperature of
the horizon.
|
[
{
"created": "Thu, 20 May 2004 09:22:32 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jun 2004 07:50:42 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Jun 2004 15:56:08 GMT",
"version": "v3"
}
] |
2010-11-05
|
[
[
"Cadoni",
"M.",
""
]
] |
We show that two-dimensional anti-de Sitter spacetime (AdS_2) can be put in correspondence, holographically, both with the harmonic oscillator and the free particle. When AdS_2 has an horizon the corresponding mechanical system is a thermal harmonic oscillator at temperature given by the Hawking temperature of the horizon.
|
2112.04695
|
El Hassan Saidi
|
E.H Saidi and L.B Drissi
|
5D N=1 super QFT: symplectic quivers
|
49 pages, 14 figures
| null |
10.1016/j.nuclphysb.2021.115632
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We develop a method to build new 5D $\mathcal{N}=1$ gauge models based on
Sasaki-Einstein manifolds $Y^{p,q}.$ These models extend the standard 5D ones
having a unitary SU$\left( p\right) _{q}$ gauge symmetry based on $% Y^{p,q}$.
Particular focus is put on the building of a gauge family with symplectic
SP$\left( 2r,\mathbb{R}\right) $ symmetry. These super QFTs are embedded in
M-theory compactified on folded toric Calabi-Yau threefolds $%
\hat{X}(Y^{2r,0})$ constructed from conical $Y^{2r,0}$. By using
outer-automorphism symmetries of 5D $\mathcal{N}=1$\textbf{\ }BPS quivers with
unitary SU$\left( 2r\right) $ gauge invariance, we also construct BPS quivers
with symplectic SP$\left( 2r,\mathbb{R}\right) $ gauge symmetry. Other related
aspects are discussed. Keywords: SCFT$_{5}$, 5D $\mathcal{N}=1$ super QFT on a
finite circle, Sasaki-Einstein manifolds, BPS quivers, outer-automorphisms.
|
[
{
"created": "Thu, 9 Dec 2021 04:27:09 GMT",
"version": "v1"
}
] |
2021-12-10
|
[
[
"Saidi",
"E. H",
""
],
[
"Drissi",
"L. B",
""
]
] |
We develop a method to build new 5D $\mathcal{N}=1$ gauge models based on Sasaki-Einstein manifolds $Y^{p,q}.$ These models extend the standard 5D ones having a unitary SU$\left( p\right) _{q}$ gauge symmetry based on $% Y^{p,q}$. Particular focus is put on the building of a gauge family with symplectic SP$\left( 2r,\mathbb{R}\right) $ symmetry. These super QFTs are embedded in M-theory compactified on folded toric Calabi-Yau threefolds $% \hat{X}(Y^{2r,0})$ constructed from conical $Y^{2r,0}$. By using outer-automorphism symmetries of 5D $\mathcal{N}=1$\textbf{\ }BPS quivers with unitary SU$\left( 2r\right) $ gauge invariance, we also construct BPS quivers with symplectic SP$\left( 2r,\mathbb{R}\right) $ gauge symmetry. Other related aspects are discussed. Keywords: SCFT$_{5}$, 5D $\mathcal{N}=1$ super QFT on a finite circle, Sasaki-Einstein manifolds, BPS quivers, outer-automorphisms.
|
2103.06311
|
Itamar Shamir
|
Christopher P. Herzog and Itamar Shamir
|
Anomalies from correlation functions in defect conformal field theory
| null | null |
10.1007/JHEP07(2021)091
| null |
hep-th
|
http://creativecommons.org/licenses/by/4.0/
|
In previous work, we showed that an anomaly in the one point function of
marginal operators is related by the Wess-Zumino condition to the Euler density
anomaly on a two dimensional defect or boundary. Here we analyze in detail the
two point functions of marginal operators with the stress tensor and with the
displacement operator in three dimensions. We show how to get the boundary
anomaly from these bulk two point functions and find perfect agreement with our
anomaly effective action. For a higher dimensional conformal field theory with
a four dimensional defect, we describe for the first time the anomaly effective
action that relates the Euler density term to the one point function anomaly,
generalizing our result for two dimensional defects.
|
[
{
"created": "Wed, 10 Mar 2021 19:26:52 GMT",
"version": "v1"
}
] |
2021-07-28
|
[
[
"Herzog",
"Christopher P.",
""
],
[
"Shamir",
"Itamar",
""
]
] |
In previous work, we showed that an anomaly in the one point function of marginal operators is related by the Wess-Zumino condition to the Euler density anomaly on a two dimensional defect or boundary. Here we analyze in detail the two point functions of marginal operators with the stress tensor and with the displacement operator in three dimensions. We show how to get the boundary anomaly from these bulk two point functions and find perfect agreement with our anomaly effective action. For a higher dimensional conformal field theory with a four dimensional defect, we describe for the first time the anomaly effective action that relates the Euler density term to the one point function anomaly, generalizing our result for two dimensional defects.
|
1406.1461
|
El\'ias Castellanos Dr.
|
E. Castellanos, J. I. Rivas
|
Planck-Scale Traces from the Interference Pattern of two Bose-Einstein
Condensates
| null |
Phys. Rev. D 91, 084019 (2015)
|
10.1103/PhysRevD.91.084019
| null |
gr-qc cond-mat.quant-gas
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyze the possible effects arising from Planck scale regime upon the
interference pattern of two non-interacting Bose-Einstein condensates. We start
with the analysis of the free expansion of a condensate, taken into account the
effects produced by a deformed dispersion relation, suggested in several
quantum-gravity models. The analysis of the condensate free expansion, in
particular, the modified free velocity expansion, suggests in a natural way, a
modified uncertainty principle that could leads to new phenomenological
implications related to the quantum structure of space time. Finally, we
analyze the corresponding separation between the interference fringes after the
two condensates overlap, in order to explore the sensitivity of the system to
possible signals caused by the Planck scale regime.
|
[
{
"created": "Thu, 5 Jun 2014 18:08:38 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Nov 2014 06:34:20 GMT",
"version": "v2"
}
] |
2015-04-13
|
[
[
"Castellanos",
"E.",
""
],
[
"Rivas",
"J. I.",
""
]
] |
We analyze the possible effects arising from Planck scale regime upon the interference pattern of two non-interacting Bose-Einstein condensates. We start with the analysis of the free expansion of a condensate, taken into account the effects produced by a deformed dispersion relation, suggested in several quantum-gravity models. The analysis of the condensate free expansion, in particular, the modified free velocity expansion, suggests in a natural way, a modified uncertainty principle that could leads to new phenomenological implications related to the quantum structure of space time. Finally, we analyze the corresponding separation between the interference fringes after the two condensates overlap, in order to explore the sensitivity of the system to possible signals caused by the Planck scale regime.
|
gr-qc/9709011
|
Clifford M. Will
|
Clifford M. Will (Washington University, St. Louis)
|
Bounding the mass of the graviton using gravitional-wave observations of
inspiralling compact binaries
|
8 pages, RevTeX, submitted to Phys. Rev. D
|
Phys.Rev.D57:2061-2068,1998
|
10.1103/PhysRevD.57.2061
|
WUGRAV-97-4
|
gr-qc
| null |
If gravitation is propagated by a massive field, then the velocity of
gravitational waves (gravitons) will depend upon their frequency and the
effective Newtonian potential will have a Yukawa form. In the case of
inspiralling compact binaries, gravitational waves emitted at low frequency
early in the inspiral will travel slightly slower than those emitted at high
frequency later, modifying the phase evolution of the observed inspiral
gravitational waveform, similar to that caused by post-Newtonian corrections to
quadrupole phasing. Matched filtering of the waveforms can bound such
frequency-dependent variations in propagation speed, and thereby bound the
graviton mass. The bound depends on the mass of the source and on noise
characteristics of the detector, but is independent of the distance to the
source, except for weak cosmological redshift effects. For observations of
stellar-mass compact inspiral using ground-based interferometers of the
LIGO/VIRGO type, the bound on the graviton Compton wavelength is of the order
of $6 \times 10^{12}$ km, about double that from solar-system tests of Yukawa
modifications of Newtonian gravity. For observations of super-massive black
hole binary inspiral at cosmological distances using the proposed laser
interferometer space antenna (LISA), the bound can be as large as $6 \times
10^{16}$ km. This is three orders of magnitude weaker than model-dependent
bounds from galactic cluster dynamics.
|
[
{
"created": "Thu, 4 Sep 1997 15:10:09 GMT",
"version": "v1"
}
] |
2009-12-30
|
[
[
"Will",
"Clifford M.",
"",
"Washington University, St. Louis"
]
] |
If gravitation is propagated by a massive field, then the velocity of gravitational waves (gravitons) will depend upon their frequency and the effective Newtonian potential will have a Yukawa form. In the case of inspiralling compact binaries, gravitational waves emitted at low frequency early in the inspiral will travel slightly slower than those emitted at high frequency later, modifying the phase evolution of the observed inspiral gravitational waveform, similar to that caused by post-Newtonian corrections to quadrupole phasing. Matched filtering of the waveforms can bound such frequency-dependent variations in propagation speed, and thereby bound the graviton mass. The bound depends on the mass of the source and on noise characteristics of the detector, but is independent of the distance to the source, except for weak cosmological redshift effects. For observations of stellar-mass compact inspiral using ground-based interferometers of the LIGO/VIRGO type, the bound on the graviton Compton wavelength is of the order of $6 \times 10^{12}$ km, about double that from solar-system tests of Yukawa modifications of Newtonian gravity. For observations of super-massive black hole binary inspiral at cosmological distances using the proposed laser interferometer space antenna (LISA), the bound can be as large as $6 \times 10^{16}$ km. This is three orders of magnitude weaker than model-dependent bounds from galactic cluster dynamics.
|
0712.4146
|
David Tucker-Smith
|
Zoe Thomas, David Tucker-Smith, and Neal Weiner
|
Mixed Sneutrinos, Dark Matter and the LHC
| null |
Phys.Rev.D77:115015,2008
|
10.1103/PhysRevD.77.115015
| null |
hep-ph
| null |
We study the phenomenology of supersymmetric models in which gauge-singlet
scalars mix with the MSSM sneutrinos through weak-scale $A$ terms. After
reviewing the constraints on mixed-sneutrino dark matter from measurements of
$\Omega_{CDM}$ and from direct-detection experiments, we explore
mixed-sneutrino signatures relevant to the LHC. For a mixed-sneutrino LSP and a
right-handed slepton NLSP, decays of the lightest neturalino can produce
opposite-sign, same-flavor (OSSF) dileptons with an invariant-mass distribution
shifted away from the kinematic endpoint. In different parameter regions, the
charginos and neutralinos produced in cascades all decay dominantly to the
lighter sneutrinos, leading to a kinematic edge in the jet-lepton
invariant-mass distribution from the decay chain $\tilde{q} \to \chi^- q \to
\snu^* l q$, without an OSSF dilepton signature. We explore the possibility of
using mass estimation methods to distinguish this mixed-sneutrino jet-lepton
signature from an MSSM one. Finally, we consider signatures associated with
Higgs-lepton or $Z$-lepton production in cascades involving the heavier
sneutrinos.
|
[
{
"created": "Wed, 26 Dec 2007 21:34:09 GMT",
"version": "v1"
}
] |
2022-09-09
|
[
[
"Thomas",
"Zoe",
""
],
[
"Tucker-Smith",
"David",
""
],
[
"Weiner",
"Neal",
""
]
] |
We study the phenomenology of supersymmetric models in which gauge-singlet scalars mix with the MSSM sneutrinos through weak-scale $A$ terms. After reviewing the constraints on mixed-sneutrino dark matter from measurements of $\Omega_{CDM}$ and from direct-detection experiments, we explore mixed-sneutrino signatures relevant to the LHC. For a mixed-sneutrino LSP and a right-handed slepton NLSP, decays of the lightest neturalino can produce opposite-sign, same-flavor (OSSF) dileptons with an invariant-mass distribution shifted away from the kinematic endpoint. In different parameter regions, the charginos and neutralinos produced in cascades all decay dominantly to the lighter sneutrinos, leading to a kinematic edge in the jet-lepton invariant-mass distribution from the decay chain $\tilde{q} \to \chi^- q \to \snu^* l q$, without an OSSF dilepton signature. We explore the possibility of using mass estimation methods to distinguish this mixed-sneutrino jet-lepton signature from an MSSM one. Finally, we consider signatures associated with Higgs-lepton or $Z$-lepton production in cascades involving the heavier sneutrinos.
|
1609.06535
|
Xiao-Xiong Zeng
|
Xiao-Xiong Zeng, Li-Fang Li
|
Holographic phase transition probed by non-local observables
|
22 pages,37figures. arXiv admin note: text overlap with
arXiv:1601.01160, arXiv:1512.08855
|
Advances in High Energy Physics, 2016, 6153435
| null | null |
hep-th gr-qc
|
http://creativecommons.org/licenses/by-nc-sa/4.0/
|
From the viewpoint of holography, the phase structure of a 5-dimensional
Reissner-Nordstr\"{o}m-AdS black hole is probed by the two point correlation
function, Wilson loop, and entanglement entropy. As the case of thermal
entropy, we find for all the probes, the black hole undergos a Hawking-Page
phase transition, a first order phase transition and a second order phase
transition successively before it reaches to a stable phase. In addition, for
these probes, we find the equal area law for the first order phase transition
is valid always and the critical exponent of the heat capacity for the second
order phase transition coincides with that of the mean field theory regardless
of the size of the boundary region.
|
[
{
"created": "Wed, 21 Sep 2016 12:54:44 GMT",
"version": "v1"
}
] |
2016-09-22
|
[
[
"Zeng",
"Xiao-Xiong",
""
],
[
"Li",
"Li-Fang",
""
]
] |
From the viewpoint of holography, the phase structure of a 5-dimensional Reissner-Nordstr\"{o}m-AdS black hole is probed by the two point correlation function, Wilson loop, and entanglement entropy. As the case of thermal entropy, we find for all the probes, the black hole undergos a Hawking-Page phase transition, a first order phase transition and a second order phase transition successively before it reaches to a stable phase. In addition, for these probes, we find the equal area law for the first order phase transition is valid always and the critical exponent of the heat capacity for the second order phase transition coincides with that of the mean field theory regardless of the size of the boundary region.
|
2307.03161
|
Andrea Tesi
|
Michele Redi, Andrea Tesi
|
Neutrinos, Dark Matter and Higgs Vacua in Parity Solutions of the strong
CP problem
|
27 pages, 5 figures. v2) added discussion on DM direct detection
constraints, refs added and minor improvements
| null | null | null |
hep-ph astro-ph.CO
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The strong CP problem can be solved if the laws of nature are invariant under
a space-time parity exchanging the Standard Model with its mirror copy. We
review and extend different realizations of this idea with the aim of
discussing Dark Matter, neutrino physics, leptogenesis and collider physics
within the same context. In the minimal realization of Ref. [1] the mirror
world contains a massless dark photon, which leads to a rather interesting
cosmology. Mirror electrons reproduce the dark matter abundance for masses
between 500-1000 GeV with traces of strongly interacting dark matter. This
scenario also predicts deviations from cold dark matter, sizable $\Delta N_{\rm
eff}$ and colored states in the TeV range that will be tested in a variety of
upcoming experiments. We also explore scenarios where the mirror photon is
massive and the mirror particles are charged under ordinary electro-magnetism
with very different phenomenology. We also show that, for the measured values
of the SM parameters, the Higgs effective potential can give rise to a second
minimum at large field value as required to break spontaneously the parity
symmetry.
|
[
{
"created": "Thu, 6 Jul 2023 17:42:53 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Oct 2023 13:43:02 GMT",
"version": "v2"
}
] |
2023-10-23
|
[
[
"Redi",
"Michele",
""
],
[
"Tesi",
"Andrea",
""
]
] |
The strong CP problem can be solved if the laws of nature are invariant under a space-time parity exchanging the Standard Model with its mirror copy. We review and extend different realizations of this idea with the aim of discussing Dark Matter, neutrino physics, leptogenesis and collider physics within the same context. In the minimal realization of Ref. [1] the mirror world contains a massless dark photon, which leads to a rather interesting cosmology. Mirror electrons reproduce the dark matter abundance for masses between 500-1000 GeV with traces of strongly interacting dark matter. This scenario also predicts deviations from cold dark matter, sizable $\Delta N_{\rm eff}$ and colored states in the TeV range that will be tested in a variety of upcoming experiments. We also explore scenarios where the mirror photon is massive and the mirror particles are charged under ordinary electro-magnetism with very different phenomenology. We also show that, for the measured values of the SM parameters, the Higgs effective potential can give rise to a second minimum at large field value as required to break spontaneously the parity symmetry.
|
2404.15569
|
Cristobal Corral
|
Crist\'obal Corral, Daniel Flores-Alfonso, Gast\'on Giribet, Julio
Oliva
|
Self-gravitating solutions in Yang-Mills-Chern-Simons theory coupled to
3D massive gravity
|
v1: 16 pages
| null | null | null |
hep-th gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
We study self-gravitating solutions of 3-dimensional massive gravity coupled
to Yang-Mills-Chern-Simons gauge theory. Among these, there is a family of
asymptotically Warped-Anti de Sitter black holes that come to generalize
previous solutions found in the literature and studied in the context of
WAdS$_3$/CFT$_2$. We also present self-gravitating solutions to the
3-dimensional Einstein-Yang-Mills theory, as well as other self-gravitating
solutions in the presence of higher-curvature terms.
|
[
{
"created": "Tue, 23 Apr 2024 23:57:56 GMT",
"version": "v1"
}
] |
2024-04-25
|
[
[
"Corral",
"Cristóbal",
""
],
[
"Flores-Alfonso",
"Daniel",
""
],
[
"Giribet",
"Gastón",
""
],
[
"Oliva",
"Julio",
""
]
] |
We study self-gravitating solutions of 3-dimensional massive gravity coupled to Yang-Mills-Chern-Simons gauge theory. Among these, there is a family of asymptotically Warped-Anti de Sitter black holes that come to generalize previous solutions found in the literature and studied in the context of WAdS$_3$/CFT$_2$. We also present self-gravitating solutions to the 3-dimensional Einstein-Yang-Mills theory, as well as other self-gravitating solutions in the presence of higher-curvature terms.
|
2301.04851
|
Xiangyu Wang
|
Xiangyu Wang, Yehui Hou and Minyong Guo
|
How different are shadows of compact objects with and without horizons?
|
19 pages,5 figures
| null |
10.1088/1475-7516/2023/05/036
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this work, we theoretically assume that a compact object (CO) can have a
dark surface so that the CO is simplified to have no emissions and reflections.
Considering that the radius of the surface can be located inside or outside the
photon region, which is closely related to the shadow curve, we investigate if
a CO without an event horizon could produce shadow structures similar to black
holes and figure out how different of shadows of COs with and without horizons.
In particular, by introducing the (possible) observational photon region, we
analytically construct an exact correspondence between the shadow curves with
the impact parameters of photons and find that there are indeed several
differences for shadows of COs without horizons and black holes. More
precisely, We found the shadow curve is still determined by the photon region
when the radius of the surface is small enough to retain a whole photon region
outside the shell. When only part of the photon region remains, the shadow
curve is partially determined by the photon region, and the remaining portion
of the shadow curve is partly controlled by the impact parameters of photons
which has a turning point on the surface. When there's no photon region outside
the surface, the shadow curve is totally controlled by the impact parameters of
photons which has a turning point on the surface.
|
[
{
"created": "Thu, 12 Jan 2023 07:31:46 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Mar 2023 14:36:00 GMT",
"version": "v2"
}
] |
2023-05-24
|
[
[
"Wang",
"Xiangyu",
""
],
[
"Hou",
"Yehui",
""
],
[
"Guo",
"Minyong",
""
]
] |
In this work, we theoretically assume that a compact object (CO) can have a dark surface so that the CO is simplified to have no emissions and reflections. Considering that the radius of the surface can be located inside or outside the photon region, which is closely related to the shadow curve, we investigate if a CO without an event horizon could produce shadow structures similar to black holes and figure out how different of shadows of COs with and without horizons. In particular, by introducing the (possible) observational photon region, we analytically construct an exact correspondence between the shadow curves with the impact parameters of photons and find that there are indeed several differences for shadows of COs without horizons and black holes. More precisely, We found the shadow curve is still determined by the photon region when the radius of the surface is small enough to retain a whole photon region outside the shell. When only part of the photon region remains, the shadow curve is partially determined by the photon region, and the remaining portion of the shadow curve is partly controlled by the impact parameters of photons which has a turning point on the surface. When there's no photon region outside the surface, the shadow curve is totally controlled by the impact parameters of photons which has a turning point on the surface.
|
1103.2598
|
Andrew Neitzke
|
Davide Gaiotto, Gregory W. Moore, Andrew Neitzke
|
Wall-Crossing in Coupled 2d-4d Systems
|
170 pages, 45 figures
| null |
10.1007/JHEP12(2012)082
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We introduce a new wall-crossing formula which combines and generalizes the
Cecotti-Vafa and Kontsevich-Soibelman formulas for supersymmetric 2d and 4d
systems respectively. This 2d-4d wall-crossing formula governs the
wall-crossing of BPS states in an N=2 supersymmetric 4d gauge theory coupled to
a supersymmetric surface defect. When the theory and defect are compactified on
a circle, we get a 3d theory with a supersymmetric line operator, corresponding
to a hyperholomorphic connection on a vector bundle over a hyperkahler space.
The 2d-4d wall-crossing formula can be interpreted as a smoothness condition
for this hyperholomorphic connection. We explain how the 2d-4d BPS spectrum can
be determined for 4d theories of class S, that is, for those theories obtained
by compactifying the six-dimensional (0,2) theory with a partial topological
twist on a punctured Riemann surface C. For such theories there are canonical
surface defects. We illustrate with several examples in the case of A_1
theories of class S. Finally, we indicate how our results can be used to
produce solutions to the A_1 Hitchin equations on the Riemann surface C.
|
[
{
"created": "Mon, 14 Mar 2011 07:55:32 GMT",
"version": "v1"
}
] |
2015-05-27
|
[
[
"Gaiotto",
"Davide",
""
],
[
"Moore",
"Gregory W.",
""
],
[
"Neitzke",
"Andrew",
""
]
] |
We introduce a new wall-crossing formula which combines and generalizes the Cecotti-Vafa and Kontsevich-Soibelman formulas for supersymmetric 2d and 4d systems respectively. This 2d-4d wall-crossing formula governs the wall-crossing of BPS states in an N=2 supersymmetric 4d gauge theory coupled to a supersymmetric surface defect. When the theory and defect are compactified on a circle, we get a 3d theory with a supersymmetric line operator, corresponding to a hyperholomorphic connection on a vector bundle over a hyperkahler space. The 2d-4d wall-crossing formula can be interpreted as a smoothness condition for this hyperholomorphic connection. We explain how the 2d-4d BPS spectrum can be determined for 4d theories of class S, that is, for those theories obtained by compactifying the six-dimensional (0,2) theory with a partial topological twist on a punctured Riemann surface C. For such theories there are canonical surface defects. We illustrate with several examples in the case of A_1 theories of class S. Finally, we indicate how our results can be used to produce solutions to the A_1 Hitchin equations on the Riemann surface C.
|
1109.1534
|
Dan Israel
|
Luca Carlevaro and Dan Israel
|
Local models of heterotic flux vacua: spacetime and worldsheet aspects
|
Proceedings from a seminar given during the XVIth European Workshop
on String Theory 2010, Madrid, 14--18 June 2010; v2:refs added
|
Fortschritte der Physik, Volume 59, Issue 7-8, pages 716--722,
July 2011
|
10.1002/prop.201100018
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on some recent progress in understanding heterotic flux
compactifications, from a worldsheet perspective mainly. We consider local
models consisting in torus fibration over warped Eguchi-Hanson space and
non-K\"ahler resolved conifold geometries. We analyze the supergravity
solutions and define a double-scaling limit of the resolved singularities,
defined such that the geometry is smooth and weakly coupled. We show that,
remarkably, the heterotic solutions admit solvable worldsheet CFT descriptions
in this limit. This allows in particular to understand the important role of
worldsheet non-perturbative effects.
|
[
{
"created": "Wed, 7 Sep 2011 18:49:39 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Sep 2011 09:30:34 GMT",
"version": "v2"
}
] |
2011-09-28
|
[
[
"Carlevaro",
"Luca",
""
],
[
"Israel",
"Dan",
""
]
] |
We report on some recent progress in understanding heterotic flux compactifications, from a worldsheet perspective mainly. We consider local models consisting in torus fibration over warped Eguchi-Hanson space and non-K\"ahler resolved conifold geometries. We analyze the supergravity solutions and define a double-scaling limit of the resolved singularities, defined such that the geometry is smooth and weakly coupled. We show that, remarkably, the heterotic solutions admit solvable worldsheet CFT descriptions in this limit. This allows in particular to understand the important role of worldsheet non-perturbative effects.
|
1706.05192
|
Romanczukiewicz Tomasz Ph.D.
|
Tomasz Roma\'nczukiewicz
|
Could the primordial radiation be responsible for vanishing of
topological defects?
|
5 pages, 3 figures, additional 3 movies (simulations)
| null |
10.1016/j.physletb.2017.08.045
| null |
hep-th math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the motion of topological defects in 1+1 and 2+1 d relativistic
$\phi^6$ model with three equal vacua in the presence of radiation. We show
that even small fluctuations can trigger a chain reaction leading to vanishing
of topological defects. Only one vacuum remains stable and domains containing
other vacua vanish. We explain this phenomenon in terms of radiation pressure
(both positive and negative). We construct an effective model which translates
the fluctuations into additional term in the field theory potential. In case of
two dimensional model we find a relation between the critical size of the bulk
and amplitude of the perturbation.
|
[
{
"created": "Fri, 16 Jun 2017 09:22:21 GMT",
"version": "v1"
}
] |
2017-11-22
|
[
[
"Romańczukiewicz",
"Tomasz",
""
]
] |
We study the motion of topological defects in 1+1 and 2+1 d relativistic $\phi^6$ model with three equal vacua in the presence of radiation. We show that even small fluctuations can trigger a chain reaction leading to vanishing of topological defects. Only one vacuum remains stable and domains containing other vacua vanish. We explain this phenomenon in terms of radiation pressure (both positive and negative). We construct an effective model which translates the fluctuations into additional term in the field theory potential. In case of two dimensional model we find a relation between the critical size of the bulk and amplitude of the perturbation.
|
hep-th/0201161
|
Harald Dorn
|
Harald Dorn (Humboldt Univ. Berlin)
|
Gauge invariant operators in field theories on non-commutative spaces
|
7 pages, Latex, to appear in the Proceedings of the RTN meeting ``The
Quantum Structure of Spacetime and the Geometric Nature of Fundamental
Interactions'', Corfu, September 13-20, 2001
|
Fortsch.Phys. 50 (2002) 884-889
|
10.1002/1521-3978(200209)50:8/9<884::AID-PROP884>3.0.CO;2-B
|
HU Berlin-EP-02/02
|
hep-th
| null |
We review some selected aspects of the construction of gauge invariant
operators in field theories on non-commutative spaces and their relation to the
energy momentum tensor as well as to the non-commutative loop equations.
|
[
{
"created": "Mon, 21 Jan 2002 16:17:51 GMT",
"version": "v1"
}
] |
2015-06-26
|
[
[
"Dorn",
"Harald",
"",
"Humboldt Univ. Berlin"
]
] |
We review some selected aspects of the construction of gauge invariant operators in field theories on non-commutative spaces and their relation to the energy momentum tensor as well as to the non-commutative loop equations.
|
hep-th/9705014
|
Leonid Chekhov
|
L. Chekhov and K. Zarembo
|
Effective Action and Measure in Matrix Model of IIB Superstrings
|
9pp., Latex; v2: the discussion of the large N limit of the induced
measure is substantially expanded
|
Mod.Phys.Lett. A12 (1997) 2331-2340
|
10.1142/S0217732397002417
|
ITEP-TH-18/97
|
hep-th
| null |
We calculate an effective action and measure induced by the integration over
the auxiliary field in the matrix model recently proposed to describe IIB
superstrings. It is shown that the measure of integration over the auxiliary
matrix is uniquely determined by locality and reparametrization invariance of
the resulting effective action. The large--$N$ limit of the induced measure for
string coordinates is discussed in detail. It is found to be ultralocal and,
thus, possibly is irrelevant in the continuum limit. The model of the GKM type
is considered in relation to the effective action problem.
|
[
{
"created": "Sun, 4 May 1997 14:25:46 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jul 1997 12:15:02 GMT",
"version": "v2"
}
] |
2009-10-30
|
[
[
"Chekhov",
"L.",
""
],
[
"Zarembo",
"K.",
""
]
] |
We calculate an effective action and measure induced by the integration over the auxiliary field in the matrix model recently proposed to describe IIB superstrings. It is shown that the measure of integration over the auxiliary matrix is uniquely determined by locality and reparametrization invariance of the resulting effective action. The large--$N$ limit of the induced measure for string coordinates is discussed in detail. It is found to be ultralocal and, thus, possibly is irrelevant in the continuum limit. The model of the GKM type is considered in relation to the effective action problem.
|
1505.02413
|
Zurab Kakushadze
|
Zura Kakushadze
|
Quantization Rules for Dynamical Systems
|
5 pages; two misprints corrected
|
Ukrainian Journal of Physics 61(2) (2016) 95-97
| null | null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We discuss a manifestly covariant way of arriving at the quantization rules
based on causality, with no reference to Poisson or Peierls brackets of any
kind.
|
[
{
"created": "Sun, 10 May 2015 17:53:24 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Nov 2015 07:20:42 GMT",
"version": "v2"
}
] |
2016-02-24
|
[
[
"Kakushadze",
"Zura",
""
]
] |
We discuss a manifestly covariant way of arriving at the quantization rules based on causality, with no reference to Poisson or Peierls brackets of any kind.
|
hep-th/0003226
|
Yolanda Lozano
|
Yolanda Lozano
|
Non-BPS D-brane Solutions in Six Dimensional Orbifolds
|
13 pages, latex file, transverse metric corrected, some changes in
section 5
|
Phys.Lett. B487 (2000) 180-186
|
10.1016/S0370-2693(00)00804-2
|
CERN-TH/2000-096
|
hep-th
| null |
Starting with the non-BPS D0-brane solution of IIB/$(-1)^{F_L}I_4$
constructed recently by Eyras and Panda we construct via T-duality the non-BPS
D2-brane and D1-brane solutions of IIB/$(-1)^{F_L}I_4$ and IIA/$(-1)^{F_L}I_4$
predicted by Sen. The D2-brane couples magnetically to the vector field of the
NS5B-brane living in the twisted sector of the Type IIB orbifold, whereas the
D1-brane couples (electrically and magnetically) to the self-dual 2-form
potential of the NS5A-brane that is present in the twisted sector of the Type
IIA orbifold construction. Finally we discuss the eleven dimensional
interpretation of these branes as originating from a non-BPS M1-brane solution
of M-theory orientifolded by $\Omega_\rho I_5$.
|
[
{
"created": "Fri, 24 Mar 2000 20:43:54 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Mar 2000 20:00:35 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Mar 2000 16:19:00 GMT",
"version": "v3"
}
] |
2009-10-31
|
[
[
"Lozano",
"Yolanda",
""
]
] |
Starting with the non-BPS D0-brane solution of IIB/$(-1)^{F_L}I_4$ constructed recently by Eyras and Panda we construct via T-duality the non-BPS D2-brane and D1-brane solutions of IIB/$(-1)^{F_L}I_4$ and IIA/$(-1)^{F_L}I_4$ predicted by Sen. The D2-brane couples magnetically to the vector field of the NS5B-brane living in the twisted sector of the Type IIB orbifold, whereas the D1-brane couples (electrically and magnetically) to the self-dual 2-form potential of the NS5A-brane that is present in the twisted sector of the Type IIA orbifold construction. Finally we discuss the eleven dimensional interpretation of these branes as originating from a non-BPS M1-brane solution of M-theory orientifolded by $\Omega_\rho I_5$.
|
hep-ph/0309016
|
Shaouly Bar-Shalom
|
David Atwood, Shaouly Bar-Shalom, Gad Eilam, Amarjit Soni
|
Three heavy jet events at hadron colliders as a sensitive probe of the
Higgs sector
|
Revtex, 11 pages, 4 figures embedded in the text. Main changes with
respect to Version 1: Numerical results re-calculated using the CTEQ5L pdf,
improved discussion on the experimental consequences, new references added.
Conclusions remain unchanged. As will appear in Phys. Rev. D
|
Phys.Rev. D69 (2004) 033006
|
10.1103/PhysRevD.69.033006
| null |
hep-ph
| null |
Assuming that a non-standard neutral Higgs with an enhanced Yukawa coupling
to a bottom quark is observed at future hadron experiments, we propose a method
for a better understanding of the Higgs sector. Our procedure is based on
"counting" the number of events with heavy jets (where "heavy" stands for a c
or b jet) versus b jets, in the final state of processes in which the Higgs is
produced in association with a single high p_T c or b jet. We show that an
observed signal of the type proposed, at either the Tevatron or the LHC, will
rule out the popular two Higgs doublet model of type II as well as its
supersymmetric version - the Minimal Supersymmetric Standard Model (MSSM), and
may provide new evidence in favor of some more exotic multi Higgs scenarios. As
an example, we show that in a version of a two Higgs doublet model which
naturally accounts for the large mass of the top quark, our signal can be
easily detected at the LHC within that framework. We also find that such a
signal may be observable at the upgraded Tevatron RunIII, if the neutral Higgs
in this model has a mass around 100 GeV and \tan\beta > 50 and if the
efficiency for distinguishing a c jet from a light jet will reach the level of
50%.
|
[
{
"created": "Mon, 1 Sep 2003 19:07:48 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Feb 2004 08:28:06 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Atwood",
"David",
""
],
[
"Bar-Shalom",
"Shaouly",
""
],
[
"Eilam",
"Gad",
""
],
[
"Soni",
"Amarjit",
""
]
] |
Assuming that a non-standard neutral Higgs with an enhanced Yukawa coupling to a bottom quark is observed at future hadron experiments, we propose a method for a better understanding of the Higgs sector. Our procedure is based on "counting" the number of events with heavy jets (where "heavy" stands for a c or b jet) versus b jets, in the final state of processes in which the Higgs is produced in association with a single high p_T c or b jet. We show that an observed signal of the type proposed, at either the Tevatron or the LHC, will rule out the popular two Higgs doublet model of type II as well as its supersymmetric version - the Minimal Supersymmetric Standard Model (MSSM), and may provide new evidence in favor of some more exotic multi Higgs scenarios. As an example, we show that in a version of a two Higgs doublet model which naturally accounts for the large mass of the top quark, our signal can be easily detected at the LHC within that framework. We also find that such a signal may be observable at the upgraded Tevatron RunIII, if the neutral Higgs in this model has a mass around 100 GeV and \tan\beta > 50 and if the efficiency for distinguishing a c jet from a light jet will reach the level of 50%.
|
gr-qc/9411064
|
Robert Bruce Mann
|
J.S.F. Chan and R.B. Mann
|
Inflationary Behaviour in Axial-symmetric Gravitational Collapse
|
5 pages, latex, epsf, 3 figures (appended as postscript files)
| null | null |
WATPHYS TH-94/07
|
gr-qc
| null |
We show that the interior of a charged, spinning black hole formed from a
general axially symmetric gravitational collapse is unstable to inflation of
both its mass and angular momentum parameters. Although our results are
formulated in the context of $(2+1)$-dimensional black holes, we argue that
they are applicable to $(3+1)$ dimensions.
|
[
{
"created": "Fri, 25 Nov 1994 15:30:16 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Nov 1994 10:22:38 GMT",
"version": "v2"
}
] |
2008-02-03
|
[
[
"Chan",
"J. S. F.",
""
],
[
"Mann",
"R. B.",
""
]
] |
We show that the interior of a charged, spinning black hole formed from a general axially symmetric gravitational collapse is unstable to inflation of both its mass and angular momentum parameters. Although our results are formulated in the context of $(2+1)$-dimensional black holes, we argue that they are applicable to $(3+1)$ dimensions.
|
1204.3001
|
David Beke
|
David Beke
|
Scalar-Tensor theories from $\Lambda(\phi)$ Plebanski gravity
|
21 pages
| null |
10.1088/1742-6596/360/1/012043
| null |
hep-th gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study a modification of the Plebanski action, which generically
corresponds to a bi-metric theory of gravity, and identify a subclass which is
equivalent to the Bergmann-Wagoner-Nordtvedt class of scalar-tensor theories.
In this manner, scalar-tensor theories are displayed as constrained BF
theories. We find that in this subclass, there is no need to impose reality of
the Urbantke metrics, as also the theory with real bivectors is a scalar-tensor
theory with a real Lorentzian metric. Furthermore, while under the former
reality conditions instabilities can arise from a wrong sign of the scalar mode
kinetic term, we show that such problems do not appear if the bivectors are
required to be real. Finally, we discuss how matter can be coupled to these
theories. The phenomenology of scalar field dark matter arises naturally within
this framework.
|
[
{
"created": "Fri, 13 Apr 2012 14:11:49 GMT",
"version": "v1"
}
] |
2015-06-04
|
[
[
"Beke",
"David",
""
]
] |
We study a modification of the Plebanski action, which generically corresponds to a bi-metric theory of gravity, and identify a subclass which is equivalent to the Bergmann-Wagoner-Nordtvedt class of scalar-tensor theories. In this manner, scalar-tensor theories are displayed as constrained BF theories. We find that in this subclass, there is no need to impose reality of the Urbantke metrics, as also the theory with real bivectors is a scalar-tensor theory with a real Lorentzian metric. Furthermore, while under the former reality conditions instabilities can arise from a wrong sign of the scalar mode kinetic term, we show that such problems do not appear if the bivectors are required to be real. Finally, we discuss how matter can be coupled to these theories. The phenomenology of scalar field dark matter arises naturally within this framework.
|
hep-th/9705130
|
Matthias Gaberdiel
|
O. Bergman, M.R. Gaberdiel, G. Lifschytz
|
Branes, Orientifolds and the Creation of Elementary Strings
|
24 pages, LaTeX, 4 postscript-figures; substantial changes to
sections 2 and 3
|
Nucl.Phys. B509 (1998) 194-215
|
10.1016/S0550-3213(97)00632-9
|
HUTP-97/A022, BRX TH-413, PUPT-1703
|
hep-th
| null |
The potential of a configuration of two Dirichlet branes for which the number
of ND-directions is eight is determined. Depending on whether one of the branes
is an anti-brane or a brane, the potential vanishes or is twice as large as the
dilaton-gravitational potential. This is shown to be related to the fact that a
fundamental string is created when two such branes cross. Special emphasis is
given to the D0-D8 system, for which an interpretation of these results in
terms of the massive IIA supergravity is presented. It is also shown that the
branes cannot move non-adiabatically in the transverse direction. The
configuration of a zero brane and an orientifold 8-plane is analyzed in a
similar way, and some implications for the type IA-heterotic duality and the
heterotic matrix theory are discussed.
|
[
{
"created": "Sun, 18 May 1997 20:41:31 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jun 1997 16:04:25 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Nov 1997 15:48:02 GMT",
"version": "v3"
}
] |
2009-10-30
|
[
[
"Bergman",
"O.",
""
],
[
"Gaberdiel",
"M. R.",
""
],
[
"Lifschytz",
"G.",
""
]
] |
The potential of a configuration of two Dirichlet branes for which the number of ND-directions is eight is determined. Depending on whether one of the branes is an anti-brane or a brane, the potential vanishes or is twice as large as the dilaton-gravitational potential. This is shown to be related to the fact that a fundamental string is created when two such branes cross. Special emphasis is given to the D0-D8 system, for which an interpretation of these results in terms of the massive IIA supergravity is presented. It is also shown that the branes cannot move non-adiabatically in the transverse direction. The configuration of a zero brane and an orientifold 8-plane is analyzed in a similar way, and some implications for the type IA-heterotic duality and the heterotic matrix theory are discussed.
|
hep-th/0304219
|
Inyong Cho
|
Inyong Cho (LPT, Orsay) and Alexander Vilenkin (Tufts University)
|
Gravity of superheavy higher-dimensional global defects
|
19 pages, revtex, 6 eps figures
|
Phys.Rev. D68 (2003) 025013
|
10.1103/PhysRevD.68.025013
|
LPT-ORSAY 03-32
|
hep-th gr-qc
| null |
Numerical solutions of Einstein's and scalar-field equations are found for a
global defect in a higher-dimensional spacetime. The defect has a
$(3+1)$-dimensional core and a ``hedgehog'' scalar-field configuration in $n=3$
extra dimensions. For sufficiently low symmetry-breaking scales $\eta$, the
solutions are characterized by a flat worldsheet geometry and a constant solid
deficit angle in the extra dimensions, in agreement with previous work. For
$\eta$ above the higher-dimensional Planck scale, we find that static-defect
solutions are singular. The singularity can be removed if the requirement of
staticity is relaxed and defect cores are allowed to inflate. We obtain an
analytic solution for the metric of such inflating defects at large distances
from the core. The three extra dimensions of the nonsingular solutions have a
``cigar'' geometry. Although our numerical solutions were obtained for defects
of codimension $n=3$, we argue that the conclusions are likely to apply to all
$n\geq 3$.
|
[
{
"created": "Fri, 25 Apr 2003 16:51:45 GMT",
"version": "v1"
}
] |
2009-11-10
|
[
[
"Cho",
"Inyong",
"",
"LPT, Orsay"
],
[
"Vilenkin",
"Alexander",
"",
"Tufts University"
]
] |
Numerical solutions of Einstein's and scalar-field equations are found for a global defect in a higher-dimensional spacetime. The defect has a $(3+1)$-dimensional core and a ``hedgehog'' scalar-field configuration in $n=3$ extra dimensions. For sufficiently low symmetry-breaking scales $\eta$, the solutions are characterized by a flat worldsheet geometry and a constant solid deficit angle in the extra dimensions, in agreement with previous work. For $\eta$ above the higher-dimensional Planck scale, we find that static-defect solutions are singular. The singularity can be removed if the requirement of staticity is relaxed and defect cores are allowed to inflate. We obtain an analytic solution for the metric of such inflating defects at large distances from the core. The three extra dimensions of the nonsingular solutions have a ``cigar'' geometry. Although our numerical solutions were obtained for defects of codimension $n=3$, we argue that the conclusions are likely to apply to all $n\geq 3$.
|
hep-th/9910017
|
HGirotti
|
H. O. Girotti, Victor O. Rivelles
|
Gauge Dependence in the AdS/CFT Correspondence
|
13 pages, REVTEX, misprints in the abstract corrected. Minor changes.
Version to be published
|
Int.J.Mod.Phys. A15 (2000) 4379
|
10.1142/S0217751X00001439
| null |
hep-th
| null |
We consider the AdS space formulation of the classical dynamics deriving from
the Stueckelberg Lagrangian. The on-shell action is shown to be free of
infrared singularities as the vector boson mass tends to zero. In this limit
the model becomes Maxwell theory formulated in an arbitrary covariant gauge.
Then we use the AdS/CFT correspondence to compute the two-point correlation
functions on the boundary. It is shown that the gauge dependence concentrates
on the contact terms.
|
[
{
"created": "Fri, 1 Oct 1999 21:44:26 GMT",
"version": "v1"
},
{
"created": "Mon, 22 May 2000 21:07:43 GMT",
"version": "v2"
}
] |
2016-12-28
|
[
[
"Girotti",
"H. O.",
""
],
[
"Rivelles",
"Victor O.",
""
]
] |
We consider the AdS space formulation of the classical dynamics deriving from the Stueckelberg Lagrangian. The on-shell action is shown to be free of infrared singularities as the vector boson mass tends to zero. In this limit the model becomes Maxwell theory formulated in an arbitrary covariant gauge. Then we use the AdS/CFT correspondence to compute the two-point correlation functions on the boundary. It is shown that the gauge dependence concentrates on the contact terms.
|
1711.07942
|
S. Weinzierl
|
Leonardo de la Cruz, Alexander Kniss and Stefan Weinzierl
|
Properties of scattering forms and their relation to associahedra
|
40 pages, version to be published
| null |
10.1007/JHEP03(2018)064
| null |
hep-th math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the half-integrands in the CHY representation of tree amplitudes
give rise to the definition of differential forms -- the scattering forms -- on
the moduli space of a Riemann sphere with $n$ marked points. These differential
forms have some remarkable properties. We show that all singularities are on
the divisor $\overline{\mathcal M}_{0,n} \backslash {\mathcal M}_{0,n}$. Each
singularity is logarithmic and the residue factorises into two differential
forms of lower points. In order for this to work, we provide a threefold
generalisation of the CHY polarisation factor (also known as reduced Pfaffian)
towards off-shell momenta, unphysical polarisations and away from the solutions
of the scattering equations. We discuss explicitly the cases of bi-adjoint
scalar amplitudes, Yang-Mills amplitudes and gravity amplitudes.
|
[
{
"created": "Tue, 21 Nov 2017 18:05:11 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Feb 2018 21:34:18 GMT",
"version": "v2"
}
] |
2018-04-04
|
[
[
"de la Cruz",
"Leonardo",
""
],
[
"Kniss",
"Alexander",
""
],
[
"Weinzierl",
"Stefan",
""
]
] |
We show that the half-integrands in the CHY representation of tree amplitudes give rise to the definition of differential forms -- the scattering forms -- on the moduli space of a Riemann sphere with $n$ marked points. These differential forms have some remarkable properties. We show that all singularities are on the divisor $\overline{\mathcal M}_{0,n} \backslash {\mathcal M}_{0,n}$. Each singularity is logarithmic and the residue factorises into two differential forms of lower points. In order for this to work, we provide a threefold generalisation of the CHY polarisation factor (also known as reduced Pfaffian) towards off-shell momenta, unphysical polarisations and away from the solutions of the scattering equations. We discuss explicitly the cases of bi-adjoint scalar amplitudes, Yang-Mills amplitudes and gravity amplitudes.
|
hep-th/9510242
|
Nam SoonKeon
|
Changhyun Ahn and Soonkeon Nam
|
Yangian Symmetries in the $SU(N)_1$ WZW Model and the
Calogero-Sutherland Model
|
12 pages, Latex; Errors in the previous version are corrected and new
results on spinons are included
|
Phys.Lett.B378:107-112,1996
|
10.1016/0370-2693(96)00402-9
|
SNUTP/95-113
|
hep-th cond-mat
| null |
We study the $SU(N)$, level $1$ Wess-Zumino-Witten model, with affine primary
fields as spinon fields of fundamental representation. By evaluating the action
of the Yangian generators $Q_{0}^{a}, Q_{1}^{a}$ and the Hamiltonian $H_2$ on
two spinon states we get a new connection between this conformal field theory
and the Calogero-Sutherland model with $SU(N)$ spin. This connection clearly
confirms the need for the $W_3$ generator in $H_2$ and an additional term in
the $Q^{a}_{1}$. We also evaluate some energy spectra of $H_2$, by acting it on
multi-spinon states.
|
[
{
"created": "Wed, 1 Nov 1995 06:53:59 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Nov 1995 05:20:03 GMT",
"version": "v2"
}
] |
2010-02-05
|
[
[
"Ahn",
"Changhyun",
""
],
[
"Nam",
"Soonkeon",
""
]
] |
We study the $SU(N)$, level $1$ Wess-Zumino-Witten model, with affine primary fields as spinon fields of fundamental representation. By evaluating the action of the Yangian generators $Q_{0}^{a}, Q_{1}^{a}$ and the Hamiltonian $H_2$ on two spinon states we get a new connection between this conformal field theory and the Calogero-Sutherland model with $SU(N)$ spin. This connection clearly confirms the need for the $W_3$ generator in $H_2$ and an additional term in the $Q^{a}_{1}$. We also evaluate some energy spectra of $H_2$, by acting it on multi-spinon states.
|
hep-th/0012177
|
Ennio Gozzi
|
E.Deotto, E.Gozzi
|
On the "Universal" N=2 Supersymmetry of Classical Mechanics
|
few misprints fixed with respect to Int.Jour.Mod.Phys.A vol 16, no15
(2001) 2709
|
Int.J.Mod.Phys.A16:2709,2001
|
10.1142/S0217751X01004190
| null |
hep-th
| null |
In this paper we continue the study of the geometrical features of a
functional approach to classical mechanics proposed some time ago. In
particular we try to shed some light on a N=2 "universal" supersymmetry which
seems to have an interesting interplay with the concept of ergodicity of the
system. To study the geometry better we make this susy local and clarify
pedagogically several issues present in the literature. Secondly, in order to
prepare the ground for a better understanding of its relation to ergodicity, we
study the system on constant energy surfaces. We find that the procedure of
constraining the system on these surfaces injects in it some local grassmannian
invariances and reduces the N=2 global susy to an N=1.
|
[
{
"created": "Tue, 19 Dec 2000 18:03:23 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jan 2001 13:09:57 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Mar 2001 13:18:49 GMT",
"version": "v3"
},
{
"created": "Thu, 18 Oct 2001 14:02:02 GMT",
"version": "v4"
}
] |
2014-11-18
|
[
[
"Deotto",
"E.",
""
],
[
"Gozzi",
"E.",
""
]
] |
In this paper we continue the study of the geometrical features of a functional approach to classical mechanics proposed some time ago. In particular we try to shed some light on a N=2 "universal" supersymmetry which seems to have an interesting interplay with the concept of ergodicity of the system. To study the geometry better we make this susy local and clarify pedagogically several issues present in the literature. Secondly, in order to prepare the ground for a better understanding of its relation to ergodicity, we study the system on constant energy surfaces. We find that the procedure of constraining the system on these surfaces injects in it some local grassmannian invariances and reduces the N=2 global susy to an N=1.
|
1509.04645
|
Georgi Dvali
|
Gia Dvali
|
Non-Thermal Corrections to Hawking Radiation Versus the Information
Paradox
|
5 pages, Latex
| null |
10.1002/prop.201500096
| null |
hep-th astro-ph.CO gr-qc hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We provide a model-independent argument indicating that for a black hole of
entropy N the non-thermal deviations from Hawking radiation, per each emission
time, are of order 1/N, as opposed to exp(-N). This fact abolishes the standard
a priory basis for the information paradox.
|
[
{
"created": "Tue, 15 Sep 2015 17:10:49 GMT",
"version": "v1"
}
] |
2016-12-21
|
[
[
"Dvali",
"Gia",
""
]
] |
We provide a model-independent argument indicating that for a black hole of entropy N the non-thermal deviations from Hawking radiation, per each emission time, are of order 1/N, as opposed to exp(-N). This fact abolishes the standard a priory basis for the information paradox.
|
2203.01396
|
Matthew Sullivan
|
Hooman Davoudiasl, Ian M. Lewis, Matthew Sullivan
|
Good things to do with extra Higgs doublets
|
contribution to Snowmass 2021, 6 pages, 4 figures, based on
arXiv:2103.12089 and arXiv:2111.08020
| null | null | null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this contribution to the Snowmass 2021 process, we outline models with two
or three Higgs doublets that address open questions of particle physics and
cosmology. In particular, we show that with two additional Higgs doublets one
can provide a mechanism for the generation of lepton asymmetry and hence baryon
asymmetry, through CP violating Higgs decays, near weak scale temperatures. In
another model with only one extra Higgs doublet, we illustrate that Yukawa
couplings to quarks and neutrinos can lead to a viable mechanism for the
generation of Dirac neutrino masses, sourced by the QCD chiral condensate of
strange quarks. We adapt Spontaneous Flavor Violation -- a framework for
coupling light fermions to new Higgs doublets while avoiding tree level
flavor-changing neutral currents -- in constructing these models. In both
cases, flavor data provide interesting constraints on the parameter space.
Either scenario includes $\mathcal{O}{(1)}$ couplings of light quarks to the
Higgs doublets which allow a future 100 TeV $pp$ collider to have reach for the
new scalars up to $\mathcal{O}{(10~{\rm TeV})}$ masses, through resonant single
production. In the neutrino mass model, collider data can shed light on the
mass hierarchy of neutrinos. This article is based on work presented in Refs.
[1,2].
|
[
{
"created": "Wed, 2 Mar 2022 20:42:28 GMT",
"version": "v1"
}
] |
2022-03-04
|
[
[
"Davoudiasl",
"Hooman",
""
],
[
"Lewis",
"Ian M.",
""
],
[
"Sullivan",
"Matthew",
""
]
] |
In this contribution to the Snowmass 2021 process, we outline models with two or three Higgs doublets that address open questions of particle physics and cosmology. In particular, we show that with two additional Higgs doublets one can provide a mechanism for the generation of lepton asymmetry and hence baryon asymmetry, through CP violating Higgs decays, near weak scale temperatures. In another model with only one extra Higgs doublet, we illustrate that Yukawa couplings to quarks and neutrinos can lead to a viable mechanism for the generation of Dirac neutrino masses, sourced by the QCD chiral condensate of strange quarks. We adapt Spontaneous Flavor Violation -- a framework for coupling light fermions to new Higgs doublets while avoiding tree level flavor-changing neutral currents -- in constructing these models. In both cases, flavor data provide interesting constraints on the parameter space. Either scenario includes $\mathcal{O}{(1)}$ couplings of light quarks to the Higgs doublets which allow a future 100 TeV $pp$ collider to have reach for the new scalars up to $\mathcal{O}{(10~{\rm TeV})}$ masses, through resonant single production. In the neutrino mass model, collider data can shed light on the mass hierarchy of neutrinos. This article is based on work presented in Refs. [1,2].
|
hep-th/0209068
|
Mohammad R. Garousi
|
Mohammad R. Garousi
|
On-shell S-matrix and tachyonic effective actions
|
Latex, 15 pages, no figures, some numbers are corrected
|
Nucl.Phys. B647 (2002) 117-130
|
10.1016/S0550-3213(02)00903-3
|
IPM/P-2002/038
|
hep-th
| null |
We evaluate various disk level four-point functions involving the massless
scalar and tachyon vertex operators in the presence of background B-flux in
superstring theory. By studying these amplitudes in specific limits, we find
couplings of two scalars with two tachyons, and couplings of four tachyons on
the world-volume of non-BPS D-branes of superstring theory. They are fully
consistent with the non-commutative tachyonic Dirac-Born-Infeld effective
action. They also fix the coefficient of $T^4$ term in the expansion of the
tachyon potential around its maximum.
|
[
{
"created": "Sun, 8 Sep 2002 13:13:46 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Sep 2002 14:35:45 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Mar 2003 07:16:04 GMT",
"version": "v3"
}
] |
2010-04-05
|
[
[
"Garousi",
"Mohammad R.",
""
]
] |
We evaluate various disk level four-point functions involving the massless scalar and tachyon vertex operators in the presence of background B-flux in superstring theory. By studying these amplitudes in specific limits, we find couplings of two scalars with two tachyons, and couplings of four tachyons on the world-volume of non-BPS D-branes of superstring theory. They are fully consistent with the non-commutative tachyonic Dirac-Born-Infeld effective action. They also fix the coefficient of $T^4$ term in the expansion of the tachyon potential around its maximum.
|
1707.04429
|
Zhonghua Li
|
Limei Zhang, Xiaoxiong Zeng, Zhonghua Li
|
AdS Black Hole with Phantom Scalar Field
|
6 pages, 8 figures
| null | null | null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In this paper, we present an AdS black hole solution with Ricci flat horizon
in Einstein-phantom scalar theory. The phantom scalar fields just depend on the
transverse coordinates $x$ and $y$, and which are parameterized by the
parameter $\alpha$. We study the thermodynamics of the AdS phantom black hole.
Although its horizon is a Ricci flat Euclidean space, we find that the
thermodynamical properties of the black hole solution are qualitatively same as
those of AdS Schwarzschild black hole. Namely there exists a minimal
temperature, the large black hole is thermodynamically stable , while the
smaller one is unstable, so there is a so-called Hawking-Page phase transition
between the large black hole and the thermal gas solution in the AdS spacetime
in Poincare coordinates. We also calculate the entanglement entropy for a strip
geometry dual to the AdS phantom black holes and find that the behavior of the
entanglement entropy is qualitatively the same as that of the black hole
thermodynamical entropy.
|
[
{
"created": "Fri, 14 Jul 2017 09:28:57 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 2017 17:58:32 GMT",
"version": "v2"
}
] |
2017-07-28
|
[
[
"Zhang",
"Limei",
""
],
[
"Zeng",
"Xiaoxiong",
""
],
[
"Li",
"Zhonghua",
""
]
] |
In this paper, we present an AdS black hole solution with Ricci flat horizon in Einstein-phantom scalar theory. The phantom scalar fields just depend on the transverse coordinates $x$ and $y$, and which are parameterized by the parameter $\alpha$. We study the thermodynamics of the AdS phantom black hole. Although its horizon is a Ricci flat Euclidean space, we find that the thermodynamical properties of the black hole solution are qualitatively same as those of AdS Schwarzschild black hole. Namely there exists a minimal temperature, the large black hole is thermodynamically stable , while the smaller one is unstable, so there is a so-called Hawking-Page phase transition between the large black hole and the thermal gas solution in the AdS spacetime in Poincare coordinates. We also calculate the entanglement entropy for a strip geometry dual to the AdS phantom black holes and find that the behavior of the entanglement entropy is qualitatively the same as that of the black hole thermodynamical entropy.
|
hep-th/9906226
|
Vijay Balasubramanian
|
Vijay Balasubramanian and Simon F. Ross
|
Holographic Particle Detection
|
26 pages, LaTeX, 7 figures, uses epsf.sty
|
Phys.Rev. D61 (2000) 044007
|
10.1103/PhysRevD.61.044007
|
HUTP-99/A032, UCSBTH-99-1
|
hep-th
| null |
In anti-de Sitter (AdS) space, classical supergravity solutions are
represented "holographically" by conformal field theory (CFT) states in which
operators have expectation values. These 1-point functions are directly related
to the asymptotic behaviour of bulk fields. In some cases, distinct
supergravity solutions have identical asymptotic behaviour; so dual expectation
values are insufficient to distinguish them. We argue that non-local objects in
the gauge theory can resolve the ambiguity, and explicitly show that
collections of point particles in AdS_3 can be detected by studying kinks in
dual CFT Green functions. Three dimensional black holes can be formed by
collision of such particles. We show how black hole formation can be detected
in the holographic dual, and calculate CFT quantities that are sensitive to the
distribution of matter inside the event horizon.
|
[
{
"created": "Tue, 29 Jun 1999 04:22:10 GMT",
"version": "v1"
}
] |
2009-10-31
|
[
[
"Balasubramanian",
"Vijay",
""
],
[
"Ross",
"Simon F.",
""
]
] |
In anti-de Sitter (AdS) space, classical supergravity solutions are represented "holographically" by conformal field theory (CFT) states in which operators have expectation values. These 1-point functions are directly related to the asymptotic behaviour of bulk fields. In some cases, distinct supergravity solutions have identical asymptotic behaviour; so dual expectation values are insufficient to distinguish them. We argue that non-local objects in the gauge theory can resolve the ambiguity, and explicitly show that collections of point particles in AdS_3 can be detected by studying kinks in dual CFT Green functions. Three dimensional black holes can be formed by collision of such particles. We show how black hole formation can be detected in the holographic dual, and calculate CFT quantities that are sensitive to the distribution of matter inside the event horizon.
|
1502.00761
|
Maja Buri\'c
|
Maja Buric, John Madore and Luka Nenadovic
|
Spinors on a curved noncommutative space: coupling to torsion and the
Gross-Neveu model
|
14 pages
| null |
10.1088/0264-9381/32/18/185018
| null |
hep-th gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We analyse the spinor action on a curved noncommutative space, the so-called
truncated Heisenberg algebra, and in particular, the nonminimal coupling of
spinors to the torsion. We find that dimensional reduction of the Dirac action
gives the noncommutative extension of the Gross-Neveu model, the model which
is, as shown by Vignes-Tourneret, fully renormalisable.
|
[
{
"created": "Tue, 3 Feb 2015 07:26:34 GMT",
"version": "v1"
}
] |
2015-09-23
|
[
[
"Buric",
"Maja",
""
],
[
"Madore",
"John",
""
],
[
"Nenadovic",
"Luka",
""
]
] |
We analyse the spinor action on a curved noncommutative space, the so-called truncated Heisenberg algebra, and in particular, the nonminimal coupling of spinors to the torsion. We find that dimensional reduction of the Dirac action gives the noncommutative extension of the Gross-Neveu model, the model which is, as shown by Vignes-Tourneret, fully renormalisable.
|
1405.1692
|
Roberto Casadio
|
Roberto Casadio, Octavian Micu, Piero Nicolini
|
Minimum length effects in black hole physics
|
29 pages, 12 figures. To be published in "Quantum Aspects of Black
Holes", ed. X. Calmet (Springer, 2014)
| null |
10.1007/978-3-319-10852-0_10
| null |
hep-th gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We review the main consequences of the possible existence of a minimum
measurable length, of the order of the Planck scale, on quantum effects
occurring in black hole physics. In particular, we focus on the ensuing minimum
mass for black holes and how modified dispersion relations affect the Hawking
decay, both in four space-time dimensions and in models with extra spatial
dimensions. In the latter case, we briefly discuss possible phenomenological
signatures.
|
[
{
"created": "Wed, 7 May 2014 18:37:21 GMT",
"version": "v1"
}
] |
2021-04-07
|
[
[
"Casadio",
"Roberto",
""
],
[
"Micu",
"Octavian",
""
],
[
"Nicolini",
"Piero",
""
]
] |
We review the main consequences of the possible existence of a minimum measurable length, of the order of the Planck scale, on quantum effects occurring in black hole physics. In particular, we focus on the ensuing minimum mass for black holes and how modified dispersion relations affect the Hawking decay, both in four space-time dimensions and in models with extra spatial dimensions. In the latter case, we briefly discuss possible phenomenological signatures.
|
hep-th/9709074
|
Yuri Gusev
|
Yuri Gusev and Andrei Zelnikov
|
Finite Temperature Nonlocal Effective Action for Scalar Fields
|
9 pages, LaTeX (title is changed)
|
Class.Quant.Grav.15:L13-L19,1998
|
10.1088/0264-9381/15/3/001
|
Alberta-Thy-18-97
|
hep-th gr-qc hep-ph
| null |
Scalar fields at finite temperature are considered in four dimensional
ultrastatic curved spacetime. One loop nonlocal effective action at finite
temperature is found up to the second order in curvature expansion. This action
is explicitly infrared finite. In the high temperature expansion of free
energy, essentially nonlocal terms linear in temperature are derived.
|
[
{
"created": "Wed, 10 Sep 1997 00:49:31 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Oct 1997 00:08:27 GMT",
"version": "v2"
}
] |
2010-04-06
|
[
[
"Gusev",
"Yuri",
""
],
[
"Zelnikov",
"Andrei",
""
]
] |
Scalar fields at finite temperature are considered in four dimensional ultrastatic curved spacetime. One loop nonlocal effective action at finite temperature is found up to the second order in curvature expansion. This action is explicitly infrared finite. In the high temperature expansion of free energy, essentially nonlocal terms linear in temperature are derived.
|
2405.14942
|
Drew Backhouse
|
Jean Alexandre, Drew Backhouse, Eleni-Alexandra Kontou, Diego Pardo
Santos and Silvia Pla
|
Mapping 1+1-dimensional black hole thermodynamics to finite volume
effects
|
28 pages, 4 figures
| null | null | null |
hep-th gr-qc
|
http://creativecommons.org/licenses/by/4.0/
|
Both black hole thermodynamics and finite volume effects in quantum field
theory violate the null energy condition. Motivated by this, we compare
thermodynamic features between two 1+1-dimensional systems: (i) a scalar field
confined to a periodic spatial interval of length $a$ and tunneling between two
degenerate vacua; (ii) a dilatonic black hole at temperature $T$ in the
presence of matter fields. If we identify $a\propto T^{-1}$, we find similar
thermodynamic behaviours, which suggests some deeper connection arising from
the presence of non-trivial boundary conditions in both systems.
|
[
{
"created": "Thu, 23 May 2024 18:00:03 GMT",
"version": "v1"
}
] |
2024-06-04
|
[
[
"Alexandre",
"Jean",
""
],
[
"Backhouse",
"Drew",
""
],
[
"Kontou",
"Eleni-Alexandra",
""
],
[
"Santos",
"Diego Pardo",
""
],
[
"Pla",
"Silvia",
""
]
] |
Both black hole thermodynamics and finite volume effects in quantum field theory violate the null energy condition. Motivated by this, we compare thermodynamic features between two 1+1-dimensional systems: (i) a scalar field confined to a periodic spatial interval of length $a$ and tunneling between two degenerate vacua; (ii) a dilatonic black hole at temperature $T$ in the presence of matter fields. If we identify $a\propto T^{-1}$, we find similar thermodynamic behaviours, which suggests some deeper connection arising from the presence of non-trivial boundary conditions in both systems.
|
2007.11239
|
Donato Bini
|
Donato Bini, Thibault Damour, Andrea Geralico
|
Sixth post-Newtonian nonlocal-in-time dynamics of binary systems
|
59 pages, no figures, one ancillary text file
|
Phys. Rev. D 102, 084047 (2020)
|
10.1103/PhysRevD.102.084047
| null |
gr-qc hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We complete our previous derivation, at the sixth post-Newtonian (6PN)
accuracy, of the local-in-time dynamics of a gravitationally interacting
two-body system by giving two gauge-invariant characterizations of its
complementary nonlocal-in-time dynamics. On the one hand, we compute the
nonlocal part of the scattering angle for hyberboliclike motions; and, on the
other hand, we compute the nonlocal part of the averaged (Delaunay) Hamiltonian
for ellipticlike motions. The former is computed as a large-angular-momentum
expansion (given here to next-to-next-to-leading order), while the latter is
given as a small-eccentricity expansion (given here to the tenth order). We
note the appearance of $\zeta(3)$ in the nonlocal part of the scattering angle.
The averaged Hamiltonian for ellipticlike motions then yields two more
gauge-invariant observables: the energy and the periastron precession as
functions of orbital frequencies. We point out the existence of a hidden
simplicity in the mass-ratio dependence of the gravitational-wave energy loss
of a two-body system.
|
[
{
"created": "Wed, 22 Jul 2020 07:44:42 GMT",
"version": "v1"
}
] |
2020-10-28
|
[
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
],
[
"Geralico",
"Andrea",
""
]
] |
We complete our previous derivation, at the sixth post-Newtonian (6PN) accuracy, of the local-in-time dynamics of a gravitationally interacting two-body system by giving two gauge-invariant characterizations of its complementary nonlocal-in-time dynamics. On the one hand, we compute the nonlocal part of the scattering angle for hyberboliclike motions; and, on the other hand, we compute the nonlocal part of the averaged (Delaunay) Hamiltonian for ellipticlike motions. The former is computed as a large-angular-momentum expansion (given here to next-to-next-to-leading order), while the latter is given as a small-eccentricity expansion (given here to the tenth order). We note the appearance of $\zeta(3)$ in the nonlocal part of the scattering angle. The averaged Hamiltonian for ellipticlike motions then yields two more gauge-invariant observables: the energy and the periastron precession as functions of orbital frequencies. We point out the existence of a hidden simplicity in the mass-ratio dependence of the gravitational-wave energy loss of a two-body system.
|
hep-th/9209015
|
Akishi Kato
|
Akishi Kato, Yas-Hiro Quano and Jun'ichi Shiraishi
|
Free Boson Representation of $q$-Vertex Operators and their Correlation
Functions
|
22 pages, latex file, UT-618 (revised version)
|
Commun.Math.Phys. 157 (1993) 119-138
|
10.1007/BF02098022
| null |
hep-th
| null |
A bosonization scheme of the $q$-vertex operators of $\uqa$ for arbitrary
level is obtained. They act as intertwiners among the highest weight modules
constructed in a bosonic Fock space. An integral formula is proposed for
$N$-point functions and explicit calculation for two-point function is
presented.
|
[
{
"created": "Sat, 5 Sep 1992 07:28:19 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Sep 1992 11:43:42 GMT",
"version": "v2"
}
] |
2009-10-22
|
[
[
"Kato",
"Akishi",
""
],
[
"Quano",
"Yas-Hiro",
""
],
[
"Shiraishi",
"Jun'ichi",
""
]
] |
A bosonization scheme of the $q$-vertex operators of $\uqa$ for arbitrary level is obtained. They act as intertwiners among the highest weight modules constructed in a bosonic Fock space. An integral formula is proposed for $N$-point functions and explicit calculation for two-point function is presented.
|
hep-th/0309233
|
Igor Tyutin
|
Igor Batalin and Igor Tyutin
|
On the transformations of hamiltonian gauge algebra under rotations of
constraints
|
11 pages, some misprints removed
|
Int.J.Mod.Phys.A20:895-905,2005
|
10.1142/S0217751X05021336
|
FIAN/TD/14/03
|
hep-th
| null |
By explicit calculation of the effect of a ghost-dependent canonical
transformation of BRST-charge, we derive the corresponding transformation law
for structure coefficients of hamiltonian gauge algebra under rotation of
constraints.We show the transformation law to deviate from the behaviour
(expected naively) characteristic to a genuine connection.
|
[
{
"created": "Thu, 25 Sep 2003 12:29:23 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Dec 2003 12:08:12 GMT",
"version": "v2"
}
] |
2010-11-05
|
[
[
"Batalin",
"Igor",
""
],
[
"Tyutin",
"Igor",
""
]
] |
By explicit calculation of the effect of a ghost-dependent canonical transformation of BRST-charge, we derive the corresponding transformation law for structure coefficients of hamiltonian gauge algebra under rotation of constraints.We show the transformation law to deviate from the behaviour (expected naively) characteristic to a genuine connection.
|
2004.09393
|
Marco Ruggieri
|
Marco Ruggieri, Maxim N. Chernodub and Zhen-Yan Lu
|
Topological susceptibility, divergent chiral density and phase diagram
of chirally imbalanced QCD medium at finite temperature
|
15 pages, 5 figures
|
Phys. Rev. D 102, 014031 (2020)
|
10.1103/PhysRevD.102.014031
| null |
hep-ph hep-lat hep-th nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that the nonlocal two-flavor Nambu--Jona-Lasinio model predicts the
enhancement of both chiral and axial symmetry breaking as the chiral imbalance
of hot QCD matter, regulated by a chiral chemical potential $\mu_5$, increases.
The two crossovers are reasonably close to each other in the range of $\mu_5$
examined here and the pseudocritical temperatures rise with $\mu_5$. The
curvatures of the chiral and axial crossovers for the chiral quark chemical
potential approximately coincide and give $\kappa_5 \simeq - 0.011$. We point
out that the presence of $\mu_5$ in thermodynamic equilibrium is inconsistent
with the fact that the chiral charge is not a Noether-conserved quantity for
massive fermions. The chiral chemical potential should not, therefore, be
considered as a true chemical potential that sets a thermodynamically stable
environment in the massive theory, but rather than as a new coupling that may
require a renormalization in the ultraviolet domain. The divergence of an
unrenormalized chiral density, \corr{coming from zero-point fermionic
fluctuations,} is a consequence of this property. We propose a solution to this
problem via a renormalization procedure.
|
[
{
"created": "Mon, 20 Apr 2020 15:48:21 GMT",
"version": "v1"
}
] |
2020-07-22
|
[
[
"Ruggieri",
"Marco",
""
],
[
"Chernodub",
"Maxim N.",
""
],
[
"Lu",
"Zhen-Yan",
""
]
] |
We show that the nonlocal two-flavor Nambu--Jona-Lasinio model predicts the enhancement of both chiral and axial symmetry breaking as the chiral imbalance of hot QCD matter, regulated by a chiral chemical potential $\mu_5$, increases. The two crossovers are reasonably close to each other in the range of $\mu_5$ examined here and the pseudocritical temperatures rise with $\mu_5$. The curvatures of the chiral and axial crossovers for the chiral quark chemical potential approximately coincide and give $\kappa_5 \simeq - 0.011$. We point out that the presence of $\mu_5$ in thermodynamic equilibrium is inconsistent with the fact that the chiral charge is not a Noether-conserved quantity for massive fermions. The chiral chemical potential should not, therefore, be considered as a true chemical potential that sets a thermodynamically stable environment in the massive theory, but rather than as a new coupling that may require a renormalization in the ultraviolet domain. The divergence of an unrenormalized chiral density, \corr{coming from zero-point fermionic fluctuations,} is a consequence of this property. We propose a solution to this problem via a renormalization procedure.
|
hep-th/9801066
|
Jae-Suk Park
|
Robbert Dijkgraaf, Jae-Suk Park and Bernd Schroers
|
N=4 Supersymmetric Yang-Mills Theory on a Kaehler Surface
|
30 pages, harvmac, some corrections with additional comments
| null | null |
ITFA-97-09
|
hep-th
| null |
We study N=4 supersymmetric Yang-Mills theory on a Kaehler manifold with
$b_2^+ \geq 3$. Adding suitable perturbations we show that the partition
function of the N=4 theory is the sum of contributions from two branches: (i)
instantons, (ii) a special class of Seiberg-Witten monopoles. We determine the
partition function for the theories with gauge group SU(2) and SO(3), using
S-duality. This leads us to a formula for the Euler characteristic of the
moduli space of instantons.
|
[
{
"created": "Mon, 12 Jan 1998 14:32:50 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Feb 1999 19:38:19 GMT",
"version": "v2"
}
] |
2007-05-23
|
[
[
"Dijkgraaf",
"Robbert",
""
],
[
"Park",
"Jae-Suk",
""
],
[
"Schroers",
"Bernd",
""
]
] |
We study N=4 supersymmetric Yang-Mills theory on a Kaehler manifold with $b_2^+ \geq 3$. Adding suitable perturbations we show that the partition function of the N=4 theory is the sum of contributions from two branches: (i) instantons, (ii) a special class of Seiberg-Witten monopoles. We determine the partition function for the theories with gauge group SU(2) and SO(3), using S-duality. This leads us to a formula for the Euler characteristic of the moduli space of instantons.
|
hep-th/9304094
| null |
G. Grignani and G. Nardelli
|
Canonical Analysis of Poincare' Gauge Theories for Two Dimansional
Gravity
|
13 pages, plain \TeX
|
Class.Quant.Grav.10:2569-2580,1993
|
10.1088/0264-9381/10/12/016
|
DFUPG-76-1993/UTF-292-1993
|
hep-th
| null |
Following the general method discussed in Refs.[1,2], Liouville gravity and
the 2 dimensional model of non-Einstenian gravity ${\cal L} \sim curv^2 +
torsion^2 + cosm. const.$ can be formulated as ISO(1,1) gauge theories. In the
first order formalism the models present, besides the Poincar\'e gauge
symmetry, additional local symmetries. We show that in both models one can fix
these additional symmetries preserving the ISO(1,1) gauge symmetry and the
diffeomorphism invariance, so that, after a preliminary Dirac procedure, the
remaining constraints uniquely satisfy the ISO(1,1) algebra. After the
additional symmetry is fixed, the equations of motion are unaltered. One thus
remarkably simplifies the canonical structure, especially of the second model.
Moreover, one shows that the Poincar\'e group can always be used consistently
as a gauge group for gravitational theories in two dimensions.
|
[
{
"created": "Wed, 21 Apr 1993 12:50:04 GMT",
"version": "v1"
}
] |
2010-04-06
|
[
[
"Grignani",
"G.",
""
],
[
"Nardelli",
"G.",
""
]
] |
Following the general method discussed in Refs.[1,2], Liouville gravity and the 2 dimensional model of non-Einstenian gravity ${\cal L} \sim curv^2 + torsion^2 + cosm. const.$ can be formulated as ISO(1,1) gauge theories. In the first order formalism the models present, besides the Poincar\'e gauge symmetry, additional local symmetries. We show that in both models one can fix these additional symmetries preserving the ISO(1,1) gauge symmetry and the diffeomorphism invariance, so that, after a preliminary Dirac procedure, the remaining constraints uniquely satisfy the ISO(1,1) algebra. After the additional symmetry is fixed, the equations of motion are unaltered. One thus remarkably simplifies the canonical structure, especially of the second model. Moreover, one shows that the Poincar\'e group can always be used consistently as a gauge group for gravitational theories in two dimensions.
|
1604.05168
|
Nikolaos Dimakis
|
N. Dimakis, A. Karagiorgos, Adamantia Zampeli, Andronikos
Paliathanasis, T. Christodoulakis and Petros A. Terzis
|
General Analytic Solutions of Scalar Field Cosmology with Arbitrary
Potential
|
24 pages, 3 figures
|
Phys. Rev. D 93, 123518 (2016)
|
10.1103/PhysRevD.93.123518
| null |
gr-qc math-ph math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the solution space for the case of a minimally coupled scalar
field with arbitrary potential in a FLRW metric. This is made possible due to
the existence of a nonlocal integral of motion corresponding to the conformal
Killing field of the two-dimensional minisuperspace metric. The case for both
spatially flat and non flat are studied first in the presence of only the
scalar field and subsequently with the addition of non interacting perfect
fluids. It is verified that this addition does not change the general form of
the solution, but only the particular expressions of the scalar field and the
potential. The results are applied in the case of parametric dark energy models
where we derive the scalar field equivalence solution for some proposed models
in the literature.
|
[
{
"created": "Mon, 18 Apr 2016 14:09:19 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jun 2016 11:49:01 GMT",
"version": "v2"
}
] |
2016-06-22
|
[
[
"Dimakis",
"N.",
""
],
[
"Karagiorgos",
"A.",
""
],
[
"Zampeli",
"Adamantia",
""
],
[
"Paliathanasis",
"Andronikos",
""
],
[
"Christodoulakis",
"T.",
""
],
[
"Terzis",
"Petros A.",
""
]
] |
We present the solution space for the case of a minimally coupled scalar field with arbitrary potential in a FLRW metric. This is made possible due to the existence of a nonlocal integral of motion corresponding to the conformal Killing field of the two-dimensional minisuperspace metric. The case for both spatially flat and non flat are studied first in the presence of only the scalar field and subsequently with the addition of non interacting perfect fluids. It is verified that this addition does not change the general form of the solution, but only the particular expressions of the scalar field and the potential. The results are applied in the case of parametric dark energy models where we derive the scalar field equivalence solution for some proposed models in the literature.
|
hep-th/0407069
|
Mboyo Esole
|
Mboyo Esole
|
The Non-Local Massive Yang-Mills Action as a Gauged Sigma Model
|
1+10 pages
| null | null | null |
hep-th
| null |
We show that the massive Yang--Mills action having as a mass term the
non-local operator introduced by Gubarov, Stodolsky, and Zakharov is
classically equivalent to a principal gauged sigma model. The non-local mass
corresponds to the topological term of the sigma model. The latter is obtained
once the degrees of freedom implicitly generated in the non-local action are
explicitly implemented as group elements. The non-local action is recovered by
integrating out these group elements. In contrast to the usual gauge-fixed
treatment, the sigma model point of view provides a safe framework in which
calculation are tractable while keeping a full control of gauge-invariance. It
shows that the non-local massive Yang--Mills action is naturally associated
with the low-energy description of QCD in the Chiral Perturbation Theory
approach. Moreover, the sigma model admits solutions called center vortices
familiar in different (de)-confinement and chiral symmetry breaking scenarios.
This suggests that the non-local operator introduced by Gubarov, Stodolsky, and
Zakharov might be sensitive to center vortices configurations.
|
[
{
"created": "Fri, 9 Jul 2004 12:02:25 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Esole",
"Mboyo",
""
]
] |
We show that the massive Yang--Mills action having as a mass term the non-local operator introduced by Gubarov, Stodolsky, and Zakharov is classically equivalent to a principal gauged sigma model. The non-local mass corresponds to the topological term of the sigma model. The latter is obtained once the degrees of freedom implicitly generated in the non-local action are explicitly implemented as group elements. The non-local action is recovered by integrating out these group elements. In contrast to the usual gauge-fixed treatment, the sigma model point of view provides a safe framework in which calculation are tractable while keeping a full control of gauge-invariance. It shows that the non-local massive Yang--Mills action is naturally associated with the low-energy description of QCD in the Chiral Perturbation Theory approach. Moreover, the sigma model admits solutions called center vortices familiar in different (de)-confinement and chiral symmetry breaking scenarios. This suggests that the non-local operator introduced by Gubarov, Stodolsky, and Zakharov might be sensitive to center vortices configurations.
|
2311.00679
|
Gabriele Tartaglino-Mazzucchelli
|
Gregory Gold, Jessica Hutomo, Saurish Khandelwal, Gabriele
Tartaglino-Mazzucchelli
|
Components of curvature-squared invariants of minimal supergravity in
five dimensions
|
99 pages of manuscript + 228 pages of supplementary file
| null | null | null |
hep-th gr-qc math-ph math.MP
|
http://creativecommons.org/licenses/by/4.0/
|
We present for the first time the component structure of the supersymmetric
completions for all curvature-squared invariants of five-dimensional, off-shell
(gauged) minimal supergravity, including all fermions. This is achieved by
using an interplay between superspace and superconformal tensor calculus
techniques, and by employing results from arXiv:1410.8682 and arXiv:2302.14295.
Our analysis is based on using a standard Weyl multiplet of conformal
supergravity coupled to a vector and a linear multiplet compensator to engineer
off-shell Poincar\'e supergravity. We compute all the descendants of the
composite linear multiplets that describe gauged supergravity together with the
three independent four-derivative invariants. These are the building blocks of
the locally superconformal invariant actions. A derivation of the primary
equations of motion for minimal gauged off-shell supergravity deformed by an
arbitrary combination of these three locally superconformal invariants, is then
provided. Finally, all the covariant descendants in the multiplets of equations
of motion are obtained by applying a series of $Q$-supersymmetry
transformations, equivalent to successively applying superspace spinor
derivatives to the primary equations of motion.
|
[
{
"created": "Wed, 1 Nov 2023 17:41:55 GMT",
"version": "v1"
}
] |
2023-11-02
|
[
[
"Gold",
"Gregory",
""
],
[
"Hutomo",
"Jessica",
""
],
[
"Khandelwal",
"Saurish",
""
],
[
"Tartaglino-Mazzucchelli",
"Gabriele",
""
]
] |
We present for the first time the component structure of the supersymmetric completions for all curvature-squared invariants of five-dimensional, off-shell (gauged) minimal supergravity, including all fermions. This is achieved by using an interplay between superspace and superconformal tensor calculus techniques, and by employing results from arXiv:1410.8682 and arXiv:2302.14295. Our analysis is based on using a standard Weyl multiplet of conformal supergravity coupled to a vector and a linear multiplet compensator to engineer off-shell Poincar\'e supergravity. We compute all the descendants of the composite linear multiplets that describe gauged supergravity together with the three independent four-derivative invariants. These are the building blocks of the locally superconformal invariant actions. A derivation of the primary equations of motion for minimal gauged off-shell supergravity deformed by an arbitrary combination of these three locally superconformal invariants, is then provided. Finally, all the covariant descendants in the multiplets of equations of motion are obtained by applying a series of $Q$-supersymmetry transformations, equivalent to successively applying superspace spinor derivatives to the primary equations of motion.
|
1008.1015
|
Alexander Prygarin
|
L. N. Lipatov
|
Analytic properties of high energy production amplitudes in N=4 SUSY
|
To appear in the proceedings of 16th International Seminar on High
Energy Physics, QUARKS-2010, Kolomna, Russia, 6-12 June, 2010. 15 pages
| null |
10.1007/s11232-012-0018-5
|
DESY-10-125
|
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We investigate analytic properties of the six point planar amplitude in N=4
SUSY at the multi-Regge kinematics for final state particles. For inelastic
processes the Steinmann relations play an important role because they give a
possibility to fix the phase structure of the Regge pole and Mandelstam cut
contributions. These contributions have the Moebius invariant form in the
transverse momentum subspace. The analyticity and factorization constraints
allow us to reproduce the two-loop correction to the 6-point BDS amplitude in
N=4 SUSY obtained earlier in the leading logarithmic approximation with the use
of the s-channel unitarity. The exponentiation hypothesis for the remainder
function in the multi-Regge kinematics is also investigated. The 6-point
amplitude in LLA can be completely reproduced from the BDS ansatz with the use
of the analyticity and Regge factorization.
|
[
{
"created": "Thu, 5 Aug 2010 16:07:04 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Nov 2010 14:14:29 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Nov 2010 13:48:08 GMT",
"version": "v3"
}
] |
2015-05-19
|
[
[
"Lipatov",
"L. N.",
""
]
] |
We investigate analytic properties of the six point planar amplitude in N=4 SUSY at the multi-Regge kinematics for final state particles. For inelastic processes the Steinmann relations play an important role because they give a possibility to fix the phase structure of the Regge pole and Mandelstam cut contributions. These contributions have the Moebius invariant form in the transverse momentum subspace. The analyticity and factorization constraints allow us to reproduce the two-loop correction to the 6-point BDS amplitude in N=4 SUSY obtained earlier in the leading logarithmic approximation with the use of the s-channel unitarity. The exponentiation hypothesis for the remainder function in the multi-Regge kinematics is also investigated. The 6-point amplitude in LLA can be completely reproduced from the BDS ansatz with the use of the analyticity and Regge factorization.
|
1008.2660
|
Pujian Mao
|
Pu-Jian Mao, Ran Li, Lin-Yu Jia, Ji-Rong Ren
|
Acceleration of particles in Einstein-Maxwell-dilaton black holes
|
14 pages
|
Chin. Phys. C 41 (2017) 065101
|
10.1088/1674-1137/41/6/065101
| null |
hep-th gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
It has recently been pointed out that, under certain conditions, the energy
of particles accelerated by black holes in the center-of-mass frame can become
arbitrarily high. In this paper, we study the collision of two particles in the
case of four-dimensional charged nonrotating, extremal charged rotating and
near-extremal charged rotating Kaluza-Klein black holes as well as the naked
singularity case in Einstein-Maxwell-dilaton theory. We find that the
center-of-mass energy for a pair of colliding particles is unlimited at the
horizon of charged nonrotating Kaluza-Klein black holes, extremal charged
rotating Kaluza-Klein black holes and in the naked singularity case.
|
[
{
"created": "Mon, 16 Aug 2010 14:03:11 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Mar 2011 08:29:17 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Mar 2011 10:06:37 GMT",
"version": "v3"
},
{
"created": "Sat, 1 Apr 2017 07:40:38 GMT",
"version": "v4"
}
] |
2017-04-04
|
[
[
"Mao",
"Pu-Jian",
""
],
[
"Li",
"Ran",
""
],
[
"Jia",
"Lin-Yu",
""
],
[
"Ren",
"Ji-Rong",
""
]
] |
It has recently been pointed out that, under certain conditions, the energy of particles accelerated by black holes in the center-of-mass frame can become arbitrarily high. In this paper, we study the collision of two particles in the case of four-dimensional charged nonrotating, extremal charged rotating and near-extremal charged rotating Kaluza-Klein black holes as well as the naked singularity case in Einstein-Maxwell-dilaton theory. We find that the center-of-mass energy for a pair of colliding particles is unlimited at the horizon of charged nonrotating Kaluza-Klein black holes, extremal charged rotating Kaluza-Klein black holes and in the naked singularity case.
|
hep-th/0003009
|
Shinsuke Mochizuki Nishigaki
|
T. Nagao, S. M. Nishigaki
|
Massive chiral random matrix ensembles at beta = 1 & 4 : QCD Dirac
operator spectra
|
12 pages, REVTeX 3.1, 2 figures; (v2) corrections on signatures in
eqs.(48), (53), (C7), and on referential notes
|
Phys.Rev. D62 (2000) 065007
|
10.1103/PhysRevD.62.065007
|
TIT-HEP-442
|
hep-th hep-lat
| null |
The zero momentum sectors in effective theories of QCD coupled to pseudoreal
(two colors) and real (adjoint) quarks have alternative descriptions in terms
of chiral orthogonal and symplectic ensembles of random matrices. Using this
correspondence, we compute correlation functions of Dirac operator eigenvalues
within a sector with an arbitrary topological charge in a presence of finite
quark masses of the order of the smallest Dirac eigenvalue. These novel
correlation functions, expressed in terms of Pfaffians, interpolate between
known results for the chiral and quenched limits as quark masses vary.
|
[
{
"created": "Wed, 1 Mar 2000 20:20:37 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Mar 2000 09:27:23 GMT",
"version": "v2"
}
] |
2009-10-31
|
[
[
"Nagao",
"T.",
""
],
[
"Nishigaki",
"S. M.",
""
]
] |
The zero momentum sectors in effective theories of QCD coupled to pseudoreal (two colors) and real (adjoint) quarks have alternative descriptions in terms of chiral orthogonal and symplectic ensembles of random matrices. Using this correspondence, we compute correlation functions of Dirac operator eigenvalues within a sector with an arbitrary topological charge in a presence of finite quark masses of the order of the smallest Dirac eigenvalue. These novel correlation functions, expressed in terms of Pfaffians, interpolate between known results for the chiral and quenched limits as quark masses vary.
|
hep-th/9508146
|
Tobias Hurth
|
Tobias Hurth
|
A Note on Slavnov-Taylor Identities in the Causal Epstein-Glaser
Approach
|
12 pages, Latex
|
Ann. Phys. 244 (1995) 340 (Appendix B)
|
10.1006/aphy.1995.1117
|
ZU-TH_21/95
|
hep-th
| null |
An alternative approach to perturbative Yang-Mills theories in four (3+1)
dimensional space-time based on the causal Epstein-Glaser method in QFT was
recently proposed. In this short note we show that the set of identities
between C-number distributions expressing nonabelian gauge invariance in the
causal approach imply identities which are analogous to the well-known
Slavnov-Taylor identities. We explicitly derive the Z-factor relations at
one-loop level.
|
[
{
"created": "Sun, 27 Aug 1995 15:14:15 GMT",
"version": "v1"
}
] |
2015-06-26
|
[
[
"Hurth",
"Tobias",
""
]
] |
An alternative approach to perturbative Yang-Mills theories in four (3+1) dimensional space-time based on the causal Epstein-Glaser method in QFT was recently proposed. In this short note we show that the set of identities between C-number distributions expressing nonabelian gauge invariance in the causal approach imply identities which are analogous to the well-known Slavnov-Taylor identities. We explicitly derive the Z-factor relations at one-loop level.
|
2212.14417
|
Martin Cederwall
|
Martin Cederwall
|
A minimal b ghost
|
9 pp
| null | null | null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The $b$ ghost, or $b$ operator, used for fixing Siegel gauge in the pure
spinor superfield formalism, is a composite operator of negative ghost number,
satisfying $\{q,b\}=\square$, where $q$ is the pure spinor differential (BRST
operator). It is traditionally constructed using non-minimal variables.
However, since all cohomology has minimal representatives, it seems likely that
there should be versions of physically meaningful operators, also with negative
ghost number, using only minimal variables. The purpose of this letter is to
demonstrate that this statement holds by providing a concrete construction in
$D=10$ super-Yang-Mills theory, and to argue that it is a general feature in
the pure spinor superfield formalism.
|
[
{
"created": "Thu, 29 Dec 2022 18:46:57 GMT",
"version": "v1"
}
] |
2023-01-02
|
[
[
"Cederwall",
"Martin",
""
]
] |
The $b$ ghost, or $b$ operator, used for fixing Siegel gauge in the pure spinor superfield formalism, is a composite operator of negative ghost number, satisfying $\{q,b\}=\square$, where $q$ is the pure spinor differential (BRST operator). It is traditionally constructed using non-minimal variables. However, since all cohomology has minimal representatives, it seems likely that there should be versions of physically meaningful operators, also with negative ghost number, using only minimal variables. The purpose of this letter is to demonstrate that this statement holds by providing a concrete construction in $D=10$ super-Yang-Mills theory, and to argue that it is a general feature in the pure spinor superfield formalism.
|
0807.0708
|
Stefan Kallweit
|
Stefan Dittmaier, Stefan Kallweit, Peter Uwer
|
NLO QCD corrections to pp->WW+jet+X
|
6 pages, latex, 5 figures, 7 eps-files, to appear in the proceedings
of 9th Workshop on Elementary Particle Theory: Loops and Legs in Quantum
Field Theory, Sondershausen, Germany, 20-25 Apr 2008
|
Nucl.Phys.Proc.Suppl.183:279-284,2008
|
10.1016/j.nuclphysbps.2008.09.117
|
MPP-2008-73
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We report on a calculation of the next-to-leading order QCD corrections to
the production of W-boson pairs in association with a hard jet at hadron
colliders, which is an important source of background for Higgs and new-physics
searches at the LHC. If a veto against the emission of a second hard jet is
applied, the corrections stabilize the leading-order prediction for the cross
section considerably.
|
[
{
"created": "Fri, 4 Jul 2008 09:55:06 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Dittmaier",
"Stefan",
""
],
[
"Kallweit",
"Stefan",
""
],
[
"Uwer",
"Peter",
""
]
] |
We report on a calculation of the next-to-leading order QCD corrections to the production of W-boson pairs in association with a hard jet at hadron colliders, which is an important source of background for Higgs and new-physics searches at the LHC. If a veto against the emission of a second hard jet is applied, the corrections stabilize the leading-order prediction for the cross section considerably.
|
2112.15172
|
Fotis Farakos
|
Fotis Farakos, Alex Kehagias, Nikolaos Liatsos
|
Complex Linear Multiplets and Local Supersymmetry Breaking
|
37 pages
| null |
10.1007/JHEP02(2022)092
| null |
hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study supersymmetry breaking from a complex linear superfield coupled to
4D N=1 supergravity. The theory has two classically decoupled vacua, one
supersymmetric and one with broken and intrinsically non-linear supersymmetry.
Depending on the values of the parameters the scalar potential can lead to
no-scale Minkwoski or a stable de Sitter or anti-de Sitter vacuum. We also
provide a dual description of the system in terms of a nilpotent chiral
superfield and a standard chiral coupled to supergravity.
|
[
{
"created": "Thu, 30 Dec 2021 18:54:18 GMT",
"version": "v1"
}
] |
2022-03-02
|
[
[
"Farakos",
"Fotis",
""
],
[
"Kehagias",
"Alex",
""
],
[
"Liatsos",
"Nikolaos",
""
]
] |
We study supersymmetry breaking from a complex linear superfield coupled to 4D N=1 supergravity. The theory has two classically decoupled vacua, one supersymmetric and one with broken and intrinsically non-linear supersymmetry. Depending on the values of the parameters the scalar potential can lead to no-scale Minkwoski or a stable de Sitter or anti-de Sitter vacuum. We also provide a dual description of the system in terms of a nilpotent chiral superfield and a standard chiral coupled to supergravity.
|
hep-th/9403126
|
Antti Niemi
|
Antti J. Niemi and O. Tirkkonen
|
Equivariance, BRST and Superspace
|
(24 pages, report UU-ITP and HU-TFT-93-65)
|
J.Math.Phys. 35 (1994) 6418-6433
|
10.1063/1.530683
| null |
hep-th
| null |
The structure of equivariant cohomology in non-abelian localization formulas
and topological field theories is discussed. Equivariance is formulated in
terms of a nilpotent BRST symmetry, and another nilpotent operator which
restricts the BRST cohomology onto the equivariant, or basic sector. A
superfield formulation is presented and connections to reducible (BFV)
quantization of topological Yang-Mills theory are discussed.
|
[
{
"created": "Mon, 21 Mar 1994 22:34:44 GMT",
"version": "v1"
}
] |
2009-10-28
|
[
[
"Niemi",
"Antti J.",
""
],
[
"Tirkkonen",
"O.",
""
]
] |
The structure of equivariant cohomology in non-abelian localization formulas and topological field theories is discussed. Equivariance is formulated in terms of a nilpotent BRST symmetry, and another nilpotent operator which restricts the BRST cohomology onto the equivariant, or basic sector. A superfield formulation is presented and connections to reducible (BFV) quantization of topological Yang-Mills theory are discussed.
|
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