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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2102.12950
|
Kento Katayama
|
Kazuki Enomoto, Shinya Kanemura, Kento Katayama
|
Probing doubly charged scalar bosons from the doublet at future
high-energy colliders
|
32 pages, 12 figures, 3 tables
|
Phys. Rev. D 104, 035040 (2021)
|
10.1103/PhysRevD.104.035040
|
OU-HET-1079
|
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The isospin doublet scalar field with hypercharge 3/2 is introduced in some
new physics models such as tiny neutrino masses. Detecting the doubly charged
scalar bosons from the doublet field can be a good probe of such models.
However, their collider phenomenology has not been examined sufficiently. We
investigate collider signatures of the doubly and singly charged scalar bosons
at the LHC for the high-luminosity upgraded option (HL-LHC) by looking at
transverse mass distributions etc. With the appropriate kinematical cuts we
demonstrate the background reduction in the minimal model in the following two
cases depending on the mass of the scalar bosons. (1) The main decay mode of
the singly charged scalar bosons is the tau lepton and missing (as well as
charm and strange quarks). (2) That is into a top bottom pair. In the both
cases, we assume that the doubly charged scalar boson is heavier than the
singly charged ones. We conclude that the scalar doublet field with $Y = 3/2$
is expected to be detectable at the HL-LHC unless the mass is too large.
|
[
{
"created": "Thu, 25 Feb 2021 16:00:05 GMT",
"version": "v1"
}
] |
2021-09-08
|
[
[
"Enomoto",
"Kazuki",
""
],
[
"Kanemura",
"Shinya",
""
],
[
"Katayama",
"Kento",
""
]
] |
The isospin doublet scalar field with hypercharge 3/2 is introduced in some new physics models such as tiny neutrino masses. Detecting the doubly charged scalar bosons from the doublet field can be a good probe of such models. However, their collider phenomenology has not been examined sufficiently. We investigate collider signatures of the doubly and singly charged scalar bosons at the LHC for the high-luminosity upgraded option (HL-LHC) by looking at transverse mass distributions etc. With the appropriate kinematical cuts we demonstrate the background reduction in the minimal model in the following two cases depending on the mass of the scalar bosons. (1) The main decay mode of the singly charged scalar bosons is the tau lepton and missing (as well as charm and strange quarks). (2) That is into a top bottom pair. In the both cases, we assume that the doubly charged scalar boson is heavier than the singly charged ones. We conclude that the scalar doublet field with $Y = 3/2$ is expected to be detectable at the HL-LHC unless the mass is too large.
|
gr-qc/0411017
|
Hideaki Kudoh
|
Hideaki Kudoh, Atsushi Taruya
|
Probing anisotropies of gravitational-wave backgrounds with a
space-based interferometer: geometric properties of antenna patterns and
their angular power
|
RevTex4, 22 pages, 6 figures (low resolution), typos corrected
|
Phys.Rev. D71 (2005) 024025
|
10.1103/PhysRevD.71.024025
|
UTAP-504, RESCEU-35/04
|
gr-qc astro-ph
| null |
We discuss the sensitivity to anisotropies of stochastic gravitational-wave
backgrounds (GWBs) observed via space-based interferometer. In addition to the
unresolved galactic binaries as the most promising GWB source of the planned
Laser Interferometer Space Antenna (LISA), the extragalactic sources for GWBs
might be detected in the future space missions. The anisotropies of the GWBs
thus play a crucial role to discriminate various components of the GWBs. We
study general features of antenna pattern sensitivity to the anisotropies of
GWBs beyond the low-frequency approximation. We show that the sensitivity of
space-based interferometer to GWBs is severely restricted by the data
combinations and the symmetries of the detector configuration. The spherical
harmonic analysis of the antenna pattern functions reveals that the angular
power of the detector response increases with frequency and the detectable
multipole moments with effective sensitivity h_{eff} \sim 10^{-20} Hz^{-1/2}
may reach $\ell \sim$ 8-10 at $f \sim f_*=10$ mHz in the case of the single
LISA detector. However, the cross correlation of optimal interferometric
variables is blind to the monopole (\ell=0) intensity anisotropy, and also to
the dipole (\ell=1) in some case, irrespective of the frequency band. Besides,
all the self-correlated signals are shown to be blind to the odd multipole
moments (\ell=odd), independently of the frequency band.
|
[
{
"created": "Wed, 3 Nov 2004 10:54:23 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Feb 2005 15:23:43 GMT",
"version": "v2"
}
] |
2009-11-10
|
[
[
"Kudoh",
"Hideaki",
""
],
[
"Taruya",
"Atsushi",
""
]
] |
We discuss the sensitivity to anisotropies of stochastic gravitational-wave backgrounds (GWBs) observed via space-based interferometer. In addition to the unresolved galactic binaries as the most promising GWB source of the planned Laser Interferometer Space Antenna (LISA), the extragalactic sources for GWBs might be detected in the future space missions. The anisotropies of the GWBs thus play a crucial role to discriminate various components of the GWBs. We study general features of antenna pattern sensitivity to the anisotropies of GWBs beyond the low-frequency approximation. We show that the sensitivity of space-based interferometer to GWBs is severely restricted by the data combinations and the symmetries of the detector configuration. The spherical harmonic analysis of the antenna pattern functions reveals that the angular power of the detector response increases with frequency and the detectable multipole moments with effective sensitivity h_{eff} \sim 10^{-20} Hz^{-1/2} may reach $\ell \sim$ 8-10 at $f \sim f_*=10$ mHz in the case of the single LISA detector. However, the cross correlation of optimal interferometric variables is blind to the monopole (\ell=0) intensity anisotropy, and also to the dipole (\ell=1) in some case, irrespective of the frequency band. Besides, all the self-correlated signals are shown to be blind to the odd multipole moments (\ell=odd), independently of the frequency band.
|
1201.0074
|
Bob Holdom
|
B. Holdom
|
New quarks: exotic versus strong
|
4 pages, 1 figure, Submitted to proceedings of TOP2011 - 4th
International Workshop on Top Quark Physics, 25-30th September 2011, Sant
Feliu de Guixols, Spain
| null |
10.1393/ncc/i2012-11221-x
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The new quarks of a fourth family are being pushed into the strongly
interacting regime due to the lower limits on their masses. The theoretical
basis and experimental implications of such quarks are compared with exotic
quarks.
|
[
{
"created": "Fri, 30 Dec 2011 06:51:31 GMT",
"version": "v1"
}
] |
2022-03-02
|
[
[
"Holdom",
"B.",
""
]
] |
The new quarks of a fourth family are being pushed into the strongly interacting regime due to the lower limits on their masses. The theoretical basis and experimental implications of such quarks are compared with exotic quarks.
|
1412.1603
|
Reza Khosravi
|
R. Khosravi and D. Hatami
|
Decay constants and masses of light tensor mesons ($J^P =2^+$)
| null |
Int. J. Mod. Phys. A 30, 1550106 (2015)
|
10.1142/S0217751X15501067
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We calculate the masses and decay constants of the light tensor mesons with
quantum numbers $J^P =2^+$ in the framework of the QCD sum rules in the
standard model. The non-perturbative contributions up to dimension-$5$ as
important terms of the operator product expansion are considered.
|
[
{
"created": "Thu, 4 Dec 2014 10:08:42 GMT",
"version": "v1"
}
] |
2018-04-17
|
[
[
"Khosravi",
"R.",
""
],
[
"Hatami",
"D.",
""
]
] |
We calculate the masses and decay constants of the light tensor mesons with quantum numbers $J^P =2^+$ in the framework of the QCD sum rules in the standard model. The non-perturbative contributions up to dimension-$5$ as important terms of the operator product expansion are considered.
|
2301.07356
|
Ivonne Alicia Maldonado Cervantes
|
Alejandro Ayala, Isabel Dom\'inguez, Ivonne Maldonado and Mar\'ia
Elena Tejeda-Yeomans
|
Core-corona approach to describe hyperon global polarization in
semi-central relativistic heavy-ion collisions
|
Proceedings for the XXXVI Annual Meeting of the Division of Particles
and Fields
| null | null | null |
hep-ph nucl-th
|
http://creativecommons.org/licenses/by-nc-nd/4.0/
|
We report on the core-corona model developed to describe the main features of
hyperon global polarization in semicentral relativistic heavy-ion collisions as
a function of the collision energy. We first neglect the contribution to
polarization from hyperons produced in the corona. In this scenario, the global
polarization turns out to be described by a delicate balance between the
vorticity-to-spin transferring reactions in the core and the predominance of
corona over core matter at low energies. We show how this last feature provides
a key ingredient missing in our original model that helps to better describe
the excitation function for $\Lambda$ and $\overline{\Lambda}$ global
polarization. To improve the description, we then introduce the contribution to
the global polarization coming from the transverse polarization of $\Lambda$s
produced in the corona, which is hereby assumed to be similar to the well-known
polarization produced in p + p reactions. The results show a small positive
contribution to the global polarization, however they are not yet conclusive
due to the small size of the MC sample used in the analysis.
|
[
{
"created": "Wed, 18 Jan 2023 08:06:56 GMT",
"version": "v1"
}
] |
2023-01-19
|
[
[
"Ayala",
"Alejandro",
""
],
[
"Domínguez",
"Isabel",
""
],
[
"Maldonado",
"Ivonne",
""
],
[
"Tejeda-Yeomans",
"María Elena",
""
]
] |
We report on the core-corona model developed to describe the main features of hyperon global polarization in semicentral relativistic heavy-ion collisions as a function of the collision energy. We first neglect the contribution to polarization from hyperons produced in the corona. In this scenario, the global polarization turns out to be described by a delicate balance between the vorticity-to-spin transferring reactions in the core and the predominance of corona over core matter at low energies. We show how this last feature provides a key ingredient missing in our original model that helps to better describe the excitation function for $\Lambda$ and $\overline{\Lambda}$ global polarization. To improve the description, we then introduce the contribution to the global polarization coming from the transverse polarization of $\Lambda$s produced in the corona, which is hereby assumed to be similar to the well-known polarization produced in p + p reactions. The results show a small positive contribution to the global polarization, however they are not yet conclusive due to the small size of the MC sample used in the analysis.
|
1611.02691
|
Peter Tsang
|
Herbert M. Fried and Peter H. Tsang and Yves Gabellini and Thierry
Grandou and Yeuan Ming Sheu
|
Comparison of Gluon Bundle based QCD Curves with ISR Elastic pp
Scattering Data
|
12 pages, 9 figures
| null | null | null |
hep-ph hep-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Using previously described functional techniques for exact, non-perturbative,
gauge-invariant renormalized QCD processes, a simplified version of the
amplitudes - in which forms akin to Pomerons naturally appear - provides fits
to ISR Elastic pp scattering data. Extension of this work to LHC reactions is
presently underway.
|
[
{
"created": "Tue, 8 Nov 2016 20:59:44 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Nov 2016 16:44:40 GMT",
"version": "v2"
},
{
"created": "Tue, 16 May 2017 20:59:05 GMT",
"version": "v3"
}
] |
2017-05-18
|
[
[
"Fried",
"Herbert M.",
""
],
[
"Tsang",
"Peter H.",
""
],
[
"Gabellini",
"Yves",
""
],
[
"Grandou",
"Thierry",
""
],
[
"Sheu",
"Yeuan Ming",
""
]
] |
Using previously described functional techniques for exact, non-perturbative, gauge-invariant renormalized QCD processes, a simplified version of the amplitudes - in which forms akin to Pomerons naturally appear - provides fits to ISR Elastic pp scattering data. Extension of this work to LHC reactions is presently underway.
|
hep-ph/0202104
|
Bob Delbourgo
|
R. Delbourgo and M.D. Scadron
|
On the amelioration of quadratic divergences
|
8 pages, RevTex, no figures, to appear in MPLA
|
Mod.Phys.Lett.A17:209-214,2002
|
10.1142/S0217732302006266
|
UTAS-PHYS-01-12
|
hep-ph
| null |
Once massless quadratically divergent tadpole diagrams are discarded, because
they contain no intrinsic scale, it is possible to convert other divergences
into logarithmic form, using partial fraction identities; this includes the
case of quadratic divergences, as has been applied to the linear sigma model.
However the procedure must be carried out with due care, paying great attention
to correct numerator factors.
|
[
{
"created": "Tue, 12 Feb 2002 00:32:24 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Feb 2002 23:22:13 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Delbourgo",
"R.",
""
],
[
"Scadron",
"M. D.",
""
]
] |
Once massless quadratically divergent tadpole diagrams are discarded, because they contain no intrinsic scale, it is possible to convert other divergences into logarithmic form, using partial fraction identities; this includes the case of quadratic divergences, as has been applied to the linear sigma model. However the procedure must be carried out with due care, paying great attention to correct numerator factors.
|
1411.1641
|
Fredy Ochoa
|
R. Martinez, J. Nisperuza, F. Ochoa, J. P. Rubio, C.F. Sierra
|
Scalar coupling limits and diphoton Higgs decay from LHC in an $U(1)'$
model with scalar dark matter
|
Additional figures and analysis in new version
|
Phys. Rev. D 92, 035016 (2015)
|
10.1103/PhysRevD.92.035016
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
In the context of an nonuniversal $U(1)'$ extension of the standard model
free from anomalies, we introduce a complex scalar singlet candidate to be dark
matter. In addition, an extra scalar doublet and a heavy scalar singlet are
required to provide masses to all fermions and to break spontaneously the
symmetries. From unitarity and stability of the Higgs potential, we find the
full set of bounds and order relations for the scalar coupling constants. Using
recent data from the CERN-LHC collider, we study the signal strenght of the
diphoton Higgs decay $R_{\gamma \gamma}$, which imposes very stringent bounds
to the scalar couplings and other scalar parameters. We obtain constraints in
different scenarios of the space of parameters, where decays into dark matter
may or may not contribute according to the mass of the scalar dark matter
candidate. By assuming that the lightest scalar boson of the model corresponds
to the observed Higgs boson, we evaluate deviations from the SM of the
trilineal Higgs self-coupling. The conditions from unitarity, stability and
Higgs diphoton decay data allow trilineal deviations in the range $0 \leq
\delta g \lesssim -72\%$.
|
[
{
"created": "Thu, 6 Nov 2014 15:45:02 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jan 2015 17:05:40 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Aug 2015 03:57:00 GMT",
"version": "v3"
}
] |
2015-08-28
|
[
[
"Martinez",
"R.",
""
],
[
"Nisperuza",
"J.",
""
],
[
"Ochoa",
"F.",
""
],
[
"Rubio",
"J. P.",
""
],
[
"Sierra",
"C. F.",
""
]
] |
In the context of an nonuniversal $U(1)'$ extension of the standard model free from anomalies, we introduce a complex scalar singlet candidate to be dark matter. In addition, an extra scalar doublet and a heavy scalar singlet are required to provide masses to all fermions and to break spontaneously the symmetries. From unitarity and stability of the Higgs potential, we find the full set of bounds and order relations for the scalar coupling constants. Using recent data from the CERN-LHC collider, we study the signal strenght of the diphoton Higgs decay $R_{\gamma \gamma}$, which imposes very stringent bounds to the scalar couplings and other scalar parameters. We obtain constraints in different scenarios of the space of parameters, where decays into dark matter may or may not contribute according to the mass of the scalar dark matter candidate. By assuming that the lightest scalar boson of the model corresponds to the observed Higgs boson, we evaluate deviations from the SM of the trilineal Higgs self-coupling. The conditions from unitarity, stability and Higgs diphoton decay data allow trilineal deviations in the range $0 \leq \delta g \lesssim -72\%$.
|
1906.04755
|
Farinaldo Queiroz
|
Giorgio Arcadi, Manfred Lindner, Jessica Martins, Farinaldo S. Queiroz
|
New Physics Probes: Atomic Parity Violation, Polarized Electron
Scattering and Neutrino-Nucleus Coherent Scattering
|
9 pages, 3 figures, 2 tables
| null | null | null |
hep-ph hep-ex nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Atomic Parity Violation (APV) is usually quantified in terms of the weak
nuclear charge $Q_W$ of a nucleus, which depends on the coupling strength
between the atomic electrons and quarks. In this work, we review the importance
of APV to probing new physics using effective field theory. Furthermore, using
$SU(2)$ invariance, we correlate our findings with those from neutrino-nucleus
coherent scattering. Moreover, we investigate signs of parity violation in
polarized electron scattering and show how precise measurements on the Weinberg
angle, $\sin \theta_W$, will give rise to competitive bounds on light mediators
over a wide range of masses and interactions strength. Lastly, apply our bounds
to several models namely, Dark Z, Two Higgs Doublet Model-$U(1)_X$ and 3-3-1,
considering both light and heavy mediator regimes.
|
[
{
"created": "Tue, 11 Jun 2019 18:04:13 GMT",
"version": "v1"
}
] |
2019-06-13
|
[
[
"Arcadi",
"Giorgio",
""
],
[
"Lindner",
"Manfred",
""
],
[
"Martins",
"Jessica",
""
],
[
"Queiroz",
"Farinaldo S.",
""
]
] |
Atomic Parity Violation (APV) is usually quantified in terms of the weak nuclear charge $Q_W$ of a nucleus, which depends on the coupling strength between the atomic electrons and quarks. In this work, we review the importance of APV to probing new physics using effective field theory. Furthermore, using $SU(2)$ invariance, we correlate our findings with those from neutrino-nucleus coherent scattering. Moreover, we investigate signs of parity violation in polarized electron scattering and show how precise measurements on the Weinberg angle, $\sin \theta_W$, will give rise to competitive bounds on light mediators over a wide range of masses and interactions strength. Lastly, apply our bounds to several models namely, Dark Z, Two Higgs Doublet Model-$U(1)_X$ and 3-3-1, considering both light and heavy mediator regimes.
|
hep-ph/0006071
|
Prashant Shukla
|
P. Shukla, A.K. Mohanty, S.K. Gupta and Marcelo Gleiser
|
Inhomogeneous nucleation in quark hadron phase transition
|
LaTeX, 14 pages with 8 Postscript figures. Discussion added in
introduction and conclusion, Fig. 8 added, few more references added,
Typographical errors corrected. Version to appear in Phys. Rev. C
|
Phys.Rev.C62:054904,2000
|
10.1103/PhysRevC.62.054904
| null |
hep-ph nucl-th
| null |
The effect of subcritical hadron bubbles on a first-order quark-hadron phase
transition is studied. These subcritical hadron bubbles are created due to
thermal fluctuations, and can introduce a finite amount of phase mixing (quark
phase mixed with hadron phase) even at and above the critical temperature. For
reasonable choices of surface tension and correlation length, as obtained from
the lattice QCD calculations, we show that the amount of phase mixing at the
critical temperature remains below the percolation threshold. Thus, as the
system cools below the critical temperature, the transition proceeds through
the nucleation of critical-size hadron bubbles from a metastable quark-gluon
phase (QGP), within an inhomogeneous background populated by an equilibrium
distribution of subcritical hadron bubbles. The inhomogeneity of the medium
results in a substantial reduction of the nucleation barrier for critical
bubbles. Using the corrected nucleation barrier, we estimate the amount of
supercooling for different parameters controlling the phase transition, and
briefly discuss its implications to cosmology and heavy-ion collisions.
|
[
{
"created": "Thu, 8 Jun 2000 09:38:02 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Aug 2000 09:57:55 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Shukla",
"P.",
""
],
[
"Mohanty",
"A. K.",
""
],
[
"Gupta",
"S. K.",
""
],
[
"Gleiser",
"Marcelo",
""
]
] |
The effect of subcritical hadron bubbles on a first-order quark-hadron phase transition is studied. These subcritical hadron bubbles are created due to thermal fluctuations, and can introduce a finite amount of phase mixing (quark phase mixed with hadron phase) even at and above the critical temperature. For reasonable choices of surface tension and correlation length, as obtained from the lattice QCD calculations, we show that the amount of phase mixing at the critical temperature remains below the percolation threshold. Thus, as the system cools below the critical temperature, the transition proceeds through the nucleation of critical-size hadron bubbles from a metastable quark-gluon phase (QGP), within an inhomogeneous background populated by an equilibrium distribution of subcritical hadron bubbles. The inhomogeneity of the medium results in a substantial reduction of the nucleation barrier for critical bubbles. Using the corrected nucleation barrier, we estimate the amount of supercooling for different parameters controlling the phase transition, and briefly discuss its implications to cosmology and heavy-ion collisions.
|
1009.1334
|
Simonetta Liuti
|
Gary Goldstein and Simonetta Liuti
|
Deeply Virtual Exclusive Processes with Charm
|
8 pages, 3 figures, to appear in proceedings of Workshop on Exclusive
Reactions at High Momentum Transfer (IV), Jefferson Lab, May 18-21, 2010
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We propose to investigate a largely unexplored sector that is unique to the
formulation of hard exclusive processes in terms of GPDs, namely the
electroproduction of strange and charmed mesons in the kinematical ranges of
Jefferson Lab's 12 GeV upgrade, and of the proposed Electron Ion Collider
(EIC). In this contribution we focus on charmed meson production that is unique
to the EIC. Exclusive strange and charmed meson production provides new
insights in the connection of the quark/gluon degrees of freedom with the
meson-baryon description, both in the unpolarized and polarized sectors.
However, as particularly evident in polarized scattering, the underlying
mechanisms are still far from being fully understood. We present an approach in
terms of generalized parton distributions. As an application, we show that
through exclusive electroproduction of pseudoscalar charmed mesons one can
uniquely single out the non-perturbative charmed component in the nucleon
structure function.
|
[
{
"created": "Tue, 7 Sep 2010 16:35:49 GMT",
"version": "v1"
}
] |
2010-09-08
|
[
[
"Goldstein",
"Gary",
""
],
[
"Liuti",
"Simonetta",
""
]
] |
We propose to investigate a largely unexplored sector that is unique to the formulation of hard exclusive processes in terms of GPDs, namely the electroproduction of strange and charmed mesons in the kinematical ranges of Jefferson Lab's 12 GeV upgrade, and of the proposed Electron Ion Collider (EIC). In this contribution we focus on charmed meson production that is unique to the EIC. Exclusive strange and charmed meson production provides new insights in the connection of the quark/gluon degrees of freedom with the meson-baryon description, both in the unpolarized and polarized sectors. However, as particularly evident in polarized scattering, the underlying mechanisms are still far from being fully understood. We present an approach in terms of generalized parton distributions. As an application, we show that through exclusive electroproduction of pseudoscalar charmed mesons one can uniquely single out the non-perturbative charmed component in the nucleon structure function.
|
1911.04937
|
Ernesto Nungesser
|
Ho Lee, Ernesto Nungesser, Paul Tod
|
On the future of solutions to the massless Einstein-Vlasov system in a
Bianchi I cosmology
|
11 pages. In this version V2 errata corrected (in particular decay
rates of anisotropy) and references added
|
Gen Relativ Gravit 52, 48 (2020)
|
10.1007/s10714-020-02699-7
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We show that massless solutions to the Einstein-Vlasov system in a Bianchi I
space-time with small anisotropy, i.e. small shear and small trace-free part of
the spatial energy momentum tensor, tend to a radiation fluid in an Einstein-de
Sitter space-time with the anisotropy $\Sigma^a_b\Sigma^b_a$ and $\tilde{w}^i_j
\tilde{w}^j_i$ decaying as $O(t^{-\frac12})$.
|
[
{
"created": "Tue, 12 Nov 2019 15:40:00 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Feb 2020 10:10:56 GMT",
"version": "v2"
}
] |
2024-06-18
|
[
[
"Lee",
"Ho",
""
],
[
"Nungesser",
"Ernesto",
""
],
[
"Tod",
"Paul",
""
]
] |
We show that massless solutions to the Einstein-Vlasov system in a Bianchi I space-time with small anisotropy, i.e. small shear and small trace-free part of the spatial energy momentum tensor, tend to a radiation fluid in an Einstein-de Sitter space-time with the anisotropy $\Sigma^a_b\Sigma^b_a$ and $\tilde{w}^i_j \tilde{w}^j_i$ decaying as $O(t^{-\frac12})$.
|
1903.10632
|
Dillon Berger
|
Dillon Berger, Arvind Rajaraman, Jason Kumar
|
Dark Matter Through the Quark Vector Current Portal
|
14 pages
| null | null | null |
hep-ph astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider models of light dark matter coupled to quarks through a vector
current interaction. For low energies, these models must be treated through the
effective couplings to mesons, which are implemented here through the chiral
Lagrangian. We find the rates of dark matter annihilation and decay to the
light mesons, and find the expected photon spectrum from the decay of the
hadrons. We compare to current and future observations, and show that there is
a significant discovery reach for these models.
|
[
{
"created": "Mon, 25 Mar 2019 23:43:00 GMT",
"version": "v1"
}
] |
2019-03-27
|
[
[
"Berger",
"Dillon",
""
],
[
"Rajaraman",
"Arvind",
""
],
[
"Kumar",
"Jason",
""
]
] |
We consider models of light dark matter coupled to quarks through a vector current interaction. For low energies, these models must be treated through the effective couplings to mesons, which are implemented here through the chiral Lagrangian. We find the rates of dark matter annihilation and decay to the light mesons, and find the expected photon spectrum from the decay of the hadrons. We compare to current and future observations, and show that there is a significant discovery reach for these models.
|
1207.2528
|
Guo-Li Wang
|
Zhi-Hui Wang, Guo-Li Wang, Jin-Mei Zhang, Tian-Hong Wang
|
The Productions and Strong Decays of $D_q(2S)$ and $B_q(2S)$
|
22 pages, 5 figures, 5 tables
|
J. Phys. G: Nucl. Part. Phys. 39 (2012) 085006
|
10.1088/0954-3899/39/8/085006
| null |
hep-ph hep-ex
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the productions of first radial excited states $D_q(2S)$ ($q=u, d,
s$) and $B_q(2S)$ in exclusive semi-leptonic $B_{q'}$ ($q'=u, d s, c$) decays
by the improved Bethe-Salpeter method. These 2S states can be detected through
their strong decays to ground mesons, where the strong decays are calculated by
the low energy approximation as well as the impulse approximation. Some
channels have ratios of order $10^{-4}$: $Br(B^+\to\bar
D^0(2S)\ell^+{\nu_\ell})\times Br(\bar D^0(2S)\to \bar
D^{*}\pi)\approx(4.9\pm4.0)\times10^{-4}$, $Br(B^0\to
D^-(2S)\ell^+{\nu_\ell})\times Br(D^-(2S)\to \bar
D^{*}\pi)\approx(4.4\pm3.4)\times10^{-4}$. These channels could be measured by
the current B-factories. For $D_s(2S)$, we also obtain a relative large ratio:
$Br(B_s^0\to D_s^-(2S)\ell^+{\nu_\ell})\times Br(D_s^-(2S)\to \bar D^{*}\bar
K)\approx (9.9\pm14.9)\times10^{-4}$. Although there are discrepancies of the
full decay width between the theoretical predictions of ${D}^0(2S)$ and
experimental results of $D(2550)^0$, the new detected state $D(2550)^0$ is very
likely the ${D}^0(2S)$ state.
|
[
{
"created": "Wed, 11 Jul 2012 02:08:43 GMT",
"version": "v1"
}
] |
2015-06-05
|
[
[
"Wang",
"Zhi-Hui",
""
],
[
"Wang",
"Guo-Li",
""
],
[
"Zhang",
"Jin-Mei",
""
],
[
"Wang",
"Tian-Hong",
""
]
] |
We study the productions of first radial excited states $D_q(2S)$ ($q=u, d, s$) and $B_q(2S)$ in exclusive semi-leptonic $B_{q'}$ ($q'=u, d s, c$) decays by the improved Bethe-Salpeter method. These 2S states can be detected through their strong decays to ground mesons, where the strong decays are calculated by the low energy approximation as well as the impulse approximation. Some channels have ratios of order $10^{-4}$: $Br(B^+\to\bar D^0(2S)\ell^+{\nu_\ell})\times Br(\bar D^0(2S)\to \bar D^{*}\pi)\approx(4.9\pm4.0)\times10^{-4}$, $Br(B^0\to D^-(2S)\ell^+{\nu_\ell})\times Br(D^-(2S)\to \bar D^{*}\pi)\approx(4.4\pm3.4)\times10^{-4}$. These channels could be measured by the current B-factories. For $D_s(2S)$, we also obtain a relative large ratio: $Br(B_s^0\to D_s^-(2S)\ell^+{\nu_\ell})\times Br(D_s^-(2S)\to \bar D^{*}\bar K)\approx (9.9\pm14.9)\times10^{-4}$. Although there are discrepancies of the full decay width between the theoretical predictions of ${D}^0(2S)$ and experimental results of $D(2550)^0$, the new detected state $D(2550)^0$ is very likely the ${D}^0(2S)$ state.
|
1309.5495
|
Guo-Li Liu
|
Guo-Li Liu, Fei Wang
|
The lepton flavor violating signal of the charged scalar \phi^\pm and
\phi^{\pm\pm} in photon-photon collision at the ILC
|
20 pages, 10 figures, 2 tables, to appear in Nucl. Phys. B
| null |
10.1016/j.nuclphysb.2014.04.017
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
The hitherto unconstrained lepton flavor mixing, induced by the new charged
scalar \phi^\pm and \phi^{\pm\pm} predicted by many new physics models such as
higgs triplet models, may lead to the lepton flavor violating productions of
\tau\bar \mu, \tau\bar e and \mu\bar e in photon-photon collision at the
proposed international linear collider.
In this paper, we consider the contributions of the \phi^\pm and
\phi^{\pm\pm} in the context of the higgs triplet models to the processes
\gamma\gamma\to l_i\bar l_j (i, j= e, \mu, \tau, i\neq j) and find that they
can be good channels to probe these new physics models. The lepton flavor
violating processes \gamma\gamma\to l_i\bar l_j (i, j= e, \mu,\tau,i\neq j)
occur at a high rate due to the large mixing angle and the large flavor
changing coupling, so, in view of the low standard model backgrounds, they may
reach the detectable level of the ILC for a large part of the parameter space.
Since the rates predicted by the standard model are far below the detectable
level, these processes may serve as a sensitive probe for such new physics
models.
|
[
{
"created": "Sat, 21 Sep 2013 16:10:39 GMT",
"version": "v1"
},
{
"created": "Wed, 7 May 2014 22:43:31 GMT",
"version": "v2"
}
] |
2014-05-09
|
[
[
"Liu",
"Guo-Li",
""
],
[
"Wang",
"Fei",
""
]
] |
The hitherto unconstrained lepton flavor mixing, induced by the new charged scalar \phi^\pm and \phi^{\pm\pm} predicted by many new physics models such as higgs triplet models, may lead to the lepton flavor violating productions of \tau\bar \mu, \tau\bar e and \mu\bar e in photon-photon collision at the proposed international linear collider. In this paper, we consider the contributions of the \phi^\pm and \phi^{\pm\pm} in the context of the higgs triplet models to the processes \gamma\gamma\to l_i\bar l_j (i, j= e, \mu, \tau, i\neq j) and find that they can be good channels to probe these new physics models. The lepton flavor violating processes \gamma\gamma\to l_i\bar l_j (i, j= e, \mu,\tau,i\neq j) occur at a high rate due to the large mixing angle and the large flavor changing coupling, so, in view of the low standard model backgrounds, they may reach the detectable level of the ILC for a large part of the parameter space. Since the rates predicted by the standard model are far below the detectable level, these processes may serve as a sensitive probe for such new physics models.
|
1012.1806
|
Marco Zaro
|
Marco Zaro, Paolo Bolzoni, Fabio Maltoni, Sven-Olaf Moch
|
Charged Higgs production via vector-boson fusion at NNLO in QCD
|
6 pages, proceedings of the "cHarged 2010" conference, Uppsala, Sept.
2010
|
PoS Charged2010:028,2010
| null |
CP3-10-39 DESY 10-235
|
hep-ph
|
http://creativecommons.org/licenses/by-nc-sa/3.0/
|
We present the total cross sections at next-to-next-to-leading order (NNLO)
in the strong coupling for single and double charged Higgs production via weak
boson fusion. Results are obtained via the structure function approach, which
builds upon the approximate, though very accurate, factorization of the QCD
corrections between the two quark lines. The theoretical uncertainty on the
total cross sections at the LHC from higher order corrections and the parton
distribution uncertainties are estimated at the 2% level each for a wide range
of Higgs boson masses.
|
[
{
"created": "Wed, 8 Dec 2010 17:01:17 GMT",
"version": "v1"
}
] |
2011-10-06
|
[
[
"Zaro",
"Marco",
""
],
[
"Bolzoni",
"Paolo",
""
],
[
"Maltoni",
"Fabio",
""
],
[
"Moch",
"Sven-Olaf",
""
]
] |
We present the total cross sections at next-to-next-to-leading order (NNLO) in the strong coupling for single and double charged Higgs production via weak boson fusion. Results are obtained via the structure function approach, which builds upon the approximate, though very accurate, factorization of the QCD corrections between the two quark lines. The theoretical uncertainty on the total cross sections at the LHC from higher order corrections and the parton distribution uncertainties are estimated at the 2% level each for a wide range of Higgs boson masses.
|
1505.02959
|
Taishi Ikeda
|
Taishi Ikeda, Chul-Moon Yoo, Yasusada Nambu
|
Expanding universe with nonlinear gravitational waves
|
25 pages, 25 figures
|
Phys. Rev. D 92, 044041 (2015)
|
10.1103/PhysRevD.92.044041
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We test the validity of Isaacson's formula which states that high frequency
and low amplitude gravitational waves behave as a radiation fluid on average.
For this purpose, we numerically construct a solution of the vacuum Einstein
equations which contains nonlinear standing gravitational waves. The solution
is constructed in a cubic box with periodic boundary conditions. The time
evolution is solved in a gauge in which the trace of the extrinsic curvature
$K$ of the time slice becomes spatially uniform. Then, the Hubble expansion
rate $H$ is defined by $H=-K/3$ and compared with the effective scale factor
$L$ defined by the proper volume, area and length of the cubic box. We find
that, even when the wave length of the gravitational waves is comparable to the
Hubble scale, the deviation from Isaacson's formula $H\propto L^{-2}$ is at
most 3\% without taking a temporal average and is below 0.1\% with a temporal
average.
|
[
{
"created": "Tue, 12 May 2015 11:23:31 GMT",
"version": "v1"
}
] |
2015-08-26
|
[
[
"Ikeda",
"Taishi",
""
],
[
"Yoo",
"Chul-Moon",
""
],
[
"Nambu",
"Yasusada",
""
]
] |
We test the validity of Isaacson's formula which states that high frequency and low amplitude gravitational waves behave as a radiation fluid on average. For this purpose, we numerically construct a solution of the vacuum Einstein equations which contains nonlinear standing gravitational waves. The solution is constructed in a cubic box with periodic boundary conditions. The time evolution is solved in a gauge in which the trace of the extrinsic curvature $K$ of the time slice becomes spatially uniform. Then, the Hubble expansion rate $H$ is defined by $H=-K/3$ and compared with the effective scale factor $L$ defined by the proper volume, area and length of the cubic box. We find that, even when the wave length of the gravitational waves is comparable to the Hubble scale, the deviation from Isaacson's formula $H\propto L^{-2}$ is at most 3\% without taking a temporal average and is below 0.1\% with a temporal average.
|
1203.1819
|
Ovidiu Cristinel Stoica
|
Ovidiu-Cristinel Stoica
|
Beyond the Friedmann-Lemaitre-Robertson-Walker Big Bang singularity
|
To appear in CTP, 8 pages, 1 figure
|
Commun. Theor. Phys. 58(4) (2012), 613-616
|
10.1088/0253-6102/58/4/28
| null |
gr-qc astro-ph.CO math-ph math.DG math.MP
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Einstein's equation, in its standard form, breaks down at the Big Bang
singularity. A new version, equivalent to Einstein's whenever the latter is
defined, but applicable in wider situations, is proposed. The new equation
remains smooth at the Big Bang singularity of the
Friedmann-Lemaitre-Robertson-Walker model. It is a tensor equation defined in
terms of the Ricci part of the Riemann curvature. It is obtained by taking the
Kulkarni-Nomizu product between Einstein's equation and the metric tensor.
|
[
{
"created": "Thu, 8 Mar 2012 14:57:59 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Aug 2012 09:30:38 GMT",
"version": "v2"
}
] |
2014-05-13
|
[
[
"Stoica",
"Ovidiu-Cristinel",
""
]
] |
Einstein's equation, in its standard form, breaks down at the Big Bang singularity. A new version, equivalent to Einstein's whenever the latter is defined, but applicable in wider situations, is proposed. The new equation remains smooth at the Big Bang singularity of the Friedmann-Lemaitre-Robertson-Walker model. It is a tensor equation defined in terms of the Ricci part of the Riemann curvature. It is obtained by taking the Kulkarni-Nomizu product between Einstein's equation and the metric tensor.
|
1308.4407
|
Grigory Ovanesyan
|
Grigory Ovanesyan
|
Angular Distributions of Higher Order Splitting Functions
|
9 pages, 5 figures, proceedings of QCD Evolution Workshop 2013
| null |
10.1142/S2010194514600428
| null |
hep-ph nucl-th
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We study the angular distributions of the splitting functions for processes
for which a parton splits into three partons. Unlike the case of coherent
branching, we find that both in vacuum and in the presence of the dense QCD
matter, such collinear splitting functions are neither ordered, nor
anti-ordered. In the medium-induced splitting functions the angular
distributions are broader compared to the similar vacuum distribution, a
feature previously noticed from the lowest order medium-induced splitting
functions.
|
[
{
"created": "Tue, 20 Aug 2013 20:00:03 GMT",
"version": "v1"
}
] |
2015-06-16
|
[
[
"Ovanesyan",
"Grigory",
""
]
] |
We study the angular distributions of the splitting functions for processes for which a parton splits into three partons. Unlike the case of coherent branching, we find that both in vacuum and in the presence of the dense QCD matter, such collinear splitting functions are neither ordered, nor anti-ordered. In the medium-induced splitting functions the angular distributions are broader compared to the similar vacuum distribution, a feature previously noticed from the lowest order medium-induced splitting functions.
|
1206.0028
|
Robert Reasenberg
|
Robert D. Reasenberg, Biju R. Patla, James D. Phillips, and Rajesh
Thapa
|
Design and characteristics of a WEP test in a sounding-rocket payload
|
20 pages, 5 figures (color)
| null |
10.1088/0264-9381/29/18/184013
| null |
gr-qc astro-ph.IM
|
http://creativecommons.org/licenses/publicdomain/
|
We describe SR-POEM, a Galilean test of the weak equivalence principle that
is to be conducted during the free fall portion of the flight of a sounding
rocket payload. This test of a single pair of substances will have a
measurement uncertainty of {\sigma}({\eta}) < 2 10^17 after averaging the
results of eight separate drops, each of 120 s duration. The entire payload is
inverted between successive drops to cancel potential sources of systematic
error. The weak equivalence principle measurement is made with a set of four of
the SAO laser gauges, which have achieved an Allan deviation of 0.04 pm for an
averaging time of 30 s. We discuss aspects of the current design with an
emphasis on those that bear on the accuracy of the determination of {\eta}. The
discovery of a violation ({\eta} \neq 0) would have profound implications for
physics, astrophysics and cosmology.
|
[
{
"created": "Thu, 31 May 2012 20:37:34 GMT",
"version": "v1"
}
] |
2015-06-05
|
[
[
"Reasenberg",
"Robert D.",
""
],
[
"Patla",
"Biju R.",
""
],
[
"Phillips",
"James D.",
""
],
[
"Thapa",
"Rajesh",
""
]
] |
We describe SR-POEM, a Galilean test of the weak equivalence principle that is to be conducted during the free fall portion of the flight of a sounding rocket payload. This test of a single pair of substances will have a measurement uncertainty of {\sigma}({\eta}) < 2 10^17 after averaging the results of eight separate drops, each of 120 s duration. The entire payload is inverted between successive drops to cancel potential sources of systematic error. The weak equivalence principle measurement is made with a set of four of the SAO laser gauges, which have achieved an Allan deviation of 0.04 pm for an averaging time of 30 s. We discuss aspects of the current design with an emphasis on those that bear on the accuracy of the determination of {\eta}. The discovery of a violation ({\eta} \neq 0) would have profound implications for physics, astrophysics and cosmology.
|
2303.04109
|
Benjamin Steltner
|
B. Steltner, M. A. Papa, H.-B. Eggenstein, R. Prix, M. Bensch, B.
Allen, B. Machenschalk
|
Deep Einstein@Home all-sky search for continuous gravitational waves in
LIGO O3 public data
|
Accepted for publication in The Astrophysical Journal on 31 May 2023.
13 pages, 10 figures, 3 tables
|
ApJ 952 55 (2023)
|
10.3847/1538-4357/acdad4
| null |
gr-qc astro-ph.HE
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present the results of an all-sky search for continuous gravitational
waves in the public LIGO O3 data. The search covers signal frequencies $20$ Hz
$\leq f \leq 800$ Hz and a spin-down range down to $-2.6\times 10^{-9}$ Hz
s$^{-1}$1, motivated by detectability studies on synthetic populations of
Galactic neutron stars. This search is the most sensitive all-sky search to
date in this frequency/spin-down region. The initial search was performed using
the first half of the public LIGO O3 data (O3a), utilizing Graphical Processing
Units provided in equal parts by the volunteers of the Einstein@Home computing
project and by the ATLAS cluster. After a hierarchical follow-up in seven
stages, 12 candidates remain. Six are discarded at the eighth stage, by using
the remaining O3 LIGO data (O3b). The surviving six can be ascribed to
continuous-wave fake signals present in the LIGO data for validation purposes.
We recover these fake signals with very high accuracy with our last stage
search, which coherently combines all O3 data. Based on our results, we set
upper limits on the gravitational wave amplitude $h_0$, and translate these in
upper limits on the neutron star ellipticity and on the $r$-mode amplitude. The
most stringent upper limits are at $203$ Hz, with $h_0=8.1 \times 10^{-26}$ at
the 90% confidence level. Our results exclude neutron stars rotating faster
than $5$ ms with ellipticities greater than $5\times 10^{-8}
\left[{d\over{100~\textrm{pc}}}\right]$ within a distance $d$ from Earth and
$r$-mode amplitudes $\alpha \geq 10^{-5}
\left[{d\over{100~\textrm{pc}}}\right]$ for neutron stars spinning faster than
$150$ Hz.
|
[
{
"created": "Tue, 7 Mar 2023 18:19:06 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jun 2023 12:12:30 GMT",
"version": "v2"
}
] |
2023-07-21
|
[
[
"Steltner",
"B.",
""
],
[
"Papa",
"M. A.",
""
],
[
"Eggenstein",
"H. -B.",
""
],
[
"Prix",
"R.",
""
],
[
"Bensch",
"M.",
""
],
[
"Allen",
"B.",
""
],
[
"Machenschalk",
"B.",
""
]
] |
We present the results of an all-sky search for continuous gravitational waves in the public LIGO O3 data. The search covers signal frequencies $20$ Hz $\leq f \leq 800$ Hz and a spin-down range down to $-2.6\times 10^{-9}$ Hz s$^{-1}$1, motivated by detectability studies on synthetic populations of Galactic neutron stars. This search is the most sensitive all-sky search to date in this frequency/spin-down region. The initial search was performed using the first half of the public LIGO O3 data (O3a), utilizing Graphical Processing Units provided in equal parts by the volunteers of the Einstein@Home computing project and by the ATLAS cluster. After a hierarchical follow-up in seven stages, 12 candidates remain. Six are discarded at the eighth stage, by using the remaining O3 LIGO data (O3b). The surviving six can be ascribed to continuous-wave fake signals present in the LIGO data for validation purposes. We recover these fake signals with very high accuracy with our last stage search, which coherently combines all O3 data. Based on our results, we set upper limits on the gravitational wave amplitude $h_0$, and translate these in upper limits on the neutron star ellipticity and on the $r$-mode amplitude. The most stringent upper limits are at $203$ Hz, with $h_0=8.1 \times 10^{-26}$ at the 90% confidence level. Our results exclude neutron stars rotating faster than $5$ ms with ellipticities greater than $5\times 10^{-8} \left[{d\over{100~\textrm{pc}}}\right]$ within a distance $d$ from Earth and $r$-mode amplitudes $\alpha \geq 10^{-5} \left[{d\over{100~\textrm{pc}}}\right]$ for neutron stars spinning faster than $150$ Hz.
|
0711.0673
|
Kayll Lake
|
Kayll Lake
|
More on the bending of light !
|
Extended argument, revised Appendix B and further references. 11
pages revtex4 with 5 figures
| null | null | null |
gr-qc astro-ph
| null |
Recently, Rindler and Ishak have argued that the bending of light is, in
principle, changed by the presence of a cosmological constant since one must
consider not only the null geodesic equation, but also the process of
measurement. I agree with the fact that both must be considered. Here, on the
basis of the mathematically exact solution to the classical bending problem,
and independent of the cosmological constant, I clarify the approximate
argument found in the vast majority of texts (new and old) for the measured
value of the bending of light for a single source and show that the result is
in part due to the almost perfect cancelation of two terms, one of which is
seldom considered. When one considers two sources, this cancelation is of no
consequence, and, for example, if the sources are opposite with the same
associated apsidal distance, the approximate argument gives the rigorously
correct answer (up to numerical evaluation), an answer which is unaffected by
the presence of a cosmological constant.
|
[
{
"created": "Mon, 5 Nov 2007 16:08:32 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Nov 2007 16:07:43 GMT",
"version": "v2"
}
] |
2007-11-27
|
[
[
"Lake",
"Kayll",
""
]
] |
Recently, Rindler and Ishak have argued that the bending of light is, in principle, changed by the presence of a cosmological constant since one must consider not only the null geodesic equation, but also the process of measurement. I agree with the fact that both must be considered. Here, on the basis of the mathematically exact solution to the classical bending problem, and independent of the cosmological constant, I clarify the approximate argument found in the vast majority of texts (new and old) for the measured value of the bending of light for a single source and show that the result is in part due to the almost perfect cancelation of two terms, one of which is seldom considered. When one considers two sources, this cancelation is of no consequence, and, for example, if the sources are opposite with the same associated apsidal distance, the approximate argument gives the rigorously correct answer (up to numerical evaluation), an answer which is unaffected by the presence of a cosmological constant.
|
hep-ph/9701360
|
Richard Holman
|
D. Boyanovsky, H.J. de Vega, R. Holman, and S. Prem Kumar
|
Photoproduction Enhancement from Non Equilibrium Disoriented Chiral
Condensates
|
33 pages, 11 figures, uses revtex and epsfig
|
Phys.Rev.D56:5233-5250,1997
|
10.1103/PhysRevD.56.5233
|
PITT-97-1; CMU-HEP-97-03; DOR-ER/40682-128
|
hep-ph nucl-th
| null |
We study photoproduction during the non-equilibrium stages of the formation
of chiral condensates within the ``quench'' scenario of the chiral phase
transition. The dynamics is modeled with a gauged linear sigma model. A novel
quantum kinetic approach to the description of photoproduction far off
equilibrium is developed. We find that non-equilibrium spinodal instabilities
of long wavelength pion fluctuations are responsible for an enhanced
photoproduction rate for energies $\leq 80$ MeV at order $\alpha$. These
non-equilibrium effects lead to a larger contribution than the typical
processes in the medium, including that of the anomalous neutral pion decay
$\pi^0 \rightarrow 2 \gamma$ (which is of order $\alpha^2$). We follow the
evolution of the dynamics throughout the phase transition, which in this
scenario occurs on a time scale of about $2.5-3$ fm/c and integrate the photon
yield through its evolution. The spectrum of photons produced throughout the
phase transition is a non- equilibrium one. For thermal initial conditions at
the time of the quench it interpolates between a thermal distribution about 6%
above the initial temperature (at the time of the quench) for low energy $\leq
80$ MeV photons, and a high energy tail in thermal equilibrium at the initial
temperature, with a smooth crossover at 100 MeV. The rate displays a peak at
$\sim 35$ MeV which receives a larger enhancement the closer the initial
temperature at the time of the quench is to the critical temperature. It is
found that the enhancement of photoproduction at low energies is not an
artifact caused by the initial distribution of the photons, but is due to the
pionic instabilities. We suggest that these strong out of equilibrium effects
may provide experimental signatures for the formation and relaxation of DCC's
in heavy ion collisions.
|
[
{
"created": "Thu, 23 Jan 1997 22:07:57 GMT",
"version": "v1"
}
] |
2011-04-15
|
[
[
"Boyanovsky",
"D.",
""
],
[
"de Vega",
"H. J.",
""
],
[
"Holman",
"R.",
""
],
[
"Kumar",
"S. Prem",
""
]
] |
We study photoproduction during the non-equilibrium stages of the formation of chiral condensates within the ``quench'' scenario of the chiral phase transition. The dynamics is modeled with a gauged linear sigma model. A novel quantum kinetic approach to the description of photoproduction far off equilibrium is developed. We find that non-equilibrium spinodal instabilities of long wavelength pion fluctuations are responsible for an enhanced photoproduction rate for energies $\leq 80$ MeV at order $\alpha$. These non-equilibrium effects lead to a larger contribution than the typical processes in the medium, including that of the anomalous neutral pion decay $\pi^0 \rightarrow 2 \gamma$ (which is of order $\alpha^2$). We follow the evolution of the dynamics throughout the phase transition, which in this scenario occurs on a time scale of about $2.5-3$ fm/c and integrate the photon yield through its evolution. The spectrum of photons produced throughout the phase transition is a non- equilibrium one. For thermal initial conditions at the time of the quench it interpolates between a thermal distribution about 6% above the initial temperature (at the time of the quench) for low energy $\leq 80$ MeV photons, and a high energy tail in thermal equilibrium at the initial temperature, with a smooth crossover at 100 MeV. The rate displays a peak at $\sim 35$ MeV which receives a larger enhancement the closer the initial temperature at the time of the quench is to the critical temperature. It is found that the enhancement of photoproduction at low energies is not an artifact caused by the initial distribution of the photons, but is due to the pionic instabilities. We suggest that these strong out of equilibrium effects may provide experimental signatures for the formation and relaxation of DCC's in heavy ion collisions.
|
1305.3599
|
Christophe Royon
|
C. Royon
|
Diffraction via Pomeron and photon exchanges using proton tagging at the
LHC
|
Proceedings of the LISHEP 2013 conference, March 17-24 2013, Rio de
Janeiro, Brazil. arXiv admin note: substantial text overlap with
arXiv:1302.0623, arXiv:1305.0652
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We present some physics topics that can be studied at the LHC using proton
tagging. We distinguish the QCD (Pomeron structure, BFKL analysis...) from the
exploratory physics topics (HIggs boson, anomalous couplings between photons
and $W/Z$ bosons)
|
[
{
"created": "Wed, 15 May 2013 19:51:59 GMT",
"version": "v1"
}
] |
2013-05-16
|
[
[
"Royon",
"C.",
""
]
] |
We present some physics topics that can be studied at the LHC using proton tagging. We distinguish the QCD (Pomeron structure, BFKL analysis...) from the exploratory physics topics (HIggs boson, anomalous couplings between photons and $W/Z$ bosons)
|
gr-qc/0505119
|
M. D. Maia
|
M. D. Maia
|
Information Storage in Black Holes
|
5 pages Latex file, no figures. A honourable mention in the 2005 GRF
essay competition
|
Int.J.Mod.Phys.D14:2251-2256,2005
|
10.1142/S0218271805007838
| null |
gr-qc
| null |
The information loss paradox for Schwarzschild black holes is examined, using
the ADS/CFT correspondence extended to the $M_6 (4,2)$ bulk. It is found that
the only option compatible with the preservation of the quantum unitarity is
when a regular remnant region of the black hole survives to the black hole
evaporation process, where information can be stored and eventually retrieved.
|
[
{
"created": "Mon, 23 May 2005 18:17:56 GMT",
"version": "v1"
}
] |
2015-06-25
|
[
[
"Maia",
"M. D.",
""
]
] |
The information loss paradox for Schwarzschild black holes is examined, using the ADS/CFT correspondence extended to the $M_6 (4,2)$ bulk. It is found that the only option compatible with the preservation of the quantum unitarity is when a regular remnant region of the black hole survives to the black hole evaporation process, where information can be stored and eventually retrieved.
|
hep-ph/0102323
|
Archil Kobakhidze
|
Archil B. Kobakhidze
|
Proton stability in TeV-scale GUTs
|
12 pages, typos corrected, references and comments added, accepted in
Phys. Lett. B
|
Phys.Lett. B514 (2001) 131-138
|
10.1016/S0370-2693(01)00776-6
|
HIP-2001-05/TH
|
hep-ph hep-th
| null |
We discuss the proton decay problem in theories with low gravity and/or GUT
scales. We pointed out that the gravity induced proton decay can be indeed
suppressed up to a desired level, while the GUT origin of the proton
instability is rather problematic. To solve this problem we suggest the GUT
model where the proton is stable in all orders of perturbation theory. This can
be simply achieved by the replication of quark-lepton families with ordinary
quarks and leptons residing in different GUT representations and by an
appropriate dimensional reduction. The model predicts extra mirror states which
along with the GUT particles and the excitations of extra dimensions could be
observable at high-energy colliders providing the unification scale is in the
TeV range.
|
[
{
"created": "Tue, 27 Feb 2001 21:07:28 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Mar 2001 11:54:28 GMT",
"version": "v2"
},
{
"created": "Mon, 7 May 2001 08:21:13 GMT",
"version": "v3"
}
] |
2009-11-07
|
[
[
"Kobakhidze",
"Archil B.",
""
]
] |
We discuss the proton decay problem in theories with low gravity and/or GUT scales. We pointed out that the gravity induced proton decay can be indeed suppressed up to a desired level, while the GUT origin of the proton instability is rather problematic. To solve this problem we suggest the GUT model where the proton is stable in all orders of perturbation theory. This can be simply achieved by the replication of quark-lepton families with ordinary quarks and leptons residing in different GUT representations and by an appropriate dimensional reduction. The model predicts extra mirror states which along with the GUT particles and the excitations of extra dimensions could be observable at high-energy colliders providing the unification scale is in the TeV range.
|
hep-ph/0301037
|
Alon Faraggi
|
Gerald B. Cleaver, Alon E. Faraggi and Sander Nooij
|
NAHE-based string models with SU(4) X SU(2) X U(1) SO(10) Subgroup
|
25 pages. Standard Latex. Revised version to appear in NPB
|
Nucl.Phys. B672 (2003) 64-86
|
10.1016/j.nuclphysb.2003.09.012
|
BU-HEPP-02/13, CASPER-02/05, OUTP-03-01P
|
hep-ph hep-th
| null |
The orbifold GUT doublet-triplet splitting mechanism was discussed in 1994 in
the framework of the NAHE-based free fermionic models in which the SO(10) GUT
symmetry is broken to SO(6) X SO(4), SU(3) X SU(2) X U(1)^2, or SU(3) X U(1) X
SU(2)^2. In this paper we study NAHE-based free fermionic models in which the
SO(10) symmetry is broken at the string level to SU(4) X SU(2) X U(1). In
addition to the doublet-triplet splitting this case also has the advantage of
inducing the doublet-doublet splitting already at the string level. We
demonstrate, however, that NAHE-based models with SU(4) X SU(2) X U(1) SO(10)
subgroup are not viable. We show that, similarly to the LRS models, and in
contrast to the FSU5, PS and SLM models, the SU421 case gives rise to models
without an anomalous U(1) symmetry, and discuss the different cases in terms of
their N=4 origins.
|
[
{
"created": "Tue, 7 Jan 2003 11:18:48 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Sep 2003 15:04:58 GMT",
"version": "v2"
}
] |
2015-06-25
|
[
[
"Cleaver",
"Gerald B.",
""
],
[
"Faraggi",
"Alon E.",
""
],
[
"Nooij",
"Sander",
""
]
] |
The orbifold GUT doublet-triplet splitting mechanism was discussed in 1994 in the framework of the NAHE-based free fermionic models in which the SO(10) GUT symmetry is broken to SO(6) X SO(4), SU(3) X SU(2) X U(1)^2, or SU(3) X U(1) X SU(2)^2. In this paper we study NAHE-based free fermionic models in which the SO(10) symmetry is broken at the string level to SU(4) X SU(2) X U(1). In addition to the doublet-triplet splitting this case also has the advantage of inducing the doublet-doublet splitting already at the string level. We demonstrate, however, that NAHE-based models with SU(4) X SU(2) X U(1) SO(10) subgroup are not viable. We show that, similarly to the LRS models, and in contrast to the FSU5, PS and SLM models, the SU421 case gives rise to models without an anomalous U(1) symmetry, and discuss the different cases in terms of their N=4 origins.
|
0705.0554
|
Jennifer Kile
|
Jennifer Kile, Michael J. Ramsey-Musolf
|
Fermionic Effective Operators and Higgs Production at a Linear Collider
|
25 pages, 9 figures, fixed typo in author names
|
Phys.Rev.D76:054009,2007
|
10.1103/PhysRevD.76.054009
|
Caltech MAP-332, CALT-68-2648
|
hep-ph
| null |
We study the possible contributions of dimension six operators containing
fermion fields to Higgs production at a 500 GeV or 1 TeV $e^+e^-$ linear
collider. We show that -- depending on the production mechanism -- the effects
of such operators can be kinematically enhanced relative to Standard Model (SM)
contributions. We determine constraints on the operator coefficients implied by
existing precision electroweak measurements and the scale of neutrino mass. We
find that even in the presence of such constraints, substantial deviations from
SM Higgs production cross-sections are possible. We compare the effects of
fermionic operators with those associated with purely bosonic operators that
have been previously discussed in the literature.
|
[
{
"created": "Fri, 4 May 2007 01:07:32 GMT",
"version": "v1"
},
{
"created": "Wed, 9 May 2007 00:12:43 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Kile",
"Jennifer",
""
],
[
"Ramsey-Musolf",
"Michael J.",
""
]
] |
We study the possible contributions of dimension six operators containing fermion fields to Higgs production at a 500 GeV or 1 TeV $e^+e^-$ linear collider. We show that -- depending on the production mechanism -- the effects of such operators can be kinematically enhanced relative to Standard Model (SM) contributions. We determine constraints on the operator coefficients implied by existing precision electroweak measurements and the scale of neutrino mass. We find that even in the presence of such constraints, substantial deviations from SM Higgs production cross-sections are possible. We compare the effects of fermionic operators with those associated with purely bosonic operators that have been previously discussed in the literature.
|
hep-ph/9410392
|
Georg Botz
|
G. W. Botz, P. Haberl, and O. Nachtmann
|
Soft Photons in Hadron-Hadron Collisions: Synchrotron Radiation from the
QCD Vacuum?
|
Heidelberg preprint HD-THEP-94-36, 31 pages, LaTeX + ZJCITE.sty
(included), 12 figures appended as uuencoded compressed ps-file
|
Z.Phys. C67 (1995) 143-158
|
10.1007/BF01564830
| null |
hep-ph nucl-th
| null |
We discuss the production of soft photons in high energy hadron-hadron
collisions. We present a model where quarks and antiquarks in the hadrons emit
``synchrotron light'' when being deflected by the chromomagnetic fields of the
QCD vacuum, which we assume to have a nonperturbative structure. This gives a
source of prompt soft photons with frequencies $\omega <= 300 MeV$ in the c.m.
system of the collision in addition to hadronic bremsstrahlung. In comparing
the frequency spectrum and rate of ``synchrotron'' photons to experimental
results we find some supporting evidence for their existence. We make an
exclusive--inclusive connection argument to deduce from the ``synchrotron''
effect a behaviour of the neutron electric formfactor $G_E^n(Q^2)$ proportional
to $(Q^2)^{1/6}$ for $Q^2 < 20 fm^{-2}$. We find this to be consistent with
available data. In our view, soft photon production in high energy
hadron-hadron and lepton-hadron collisions as well as the behaviour of
electromagnetic hadron formfactors for low $Q^2$ are thus sensitive probes of
the nonperturbative structure of the QCD vacuum.
|
[
{
"created": "Thu, 27 Oct 1994 13:47:31 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Oct 1994 18:21:02 GMT",
"version": "v2"
}
] |
2009-10-28
|
[
[
"Botz",
"G. W.",
""
],
[
"Haberl",
"P.",
""
],
[
"Nachtmann",
"O.",
""
]
] |
We discuss the production of soft photons in high energy hadron-hadron collisions. We present a model where quarks and antiquarks in the hadrons emit ``synchrotron light'' when being deflected by the chromomagnetic fields of the QCD vacuum, which we assume to have a nonperturbative structure. This gives a source of prompt soft photons with frequencies $\omega <= 300 MeV$ in the c.m. system of the collision in addition to hadronic bremsstrahlung. In comparing the frequency spectrum and rate of ``synchrotron'' photons to experimental results we find some supporting evidence for their existence. We make an exclusive--inclusive connection argument to deduce from the ``synchrotron'' effect a behaviour of the neutron electric formfactor $G_E^n(Q^2)$ proportional to $(Q^2)^{1/6}$ for $Q^2 < 20 fm^{-2}$. We find this to be consistent with available data. In our view, soft photon production in high energy hadron-hadron and lepton-hadron collisions as well as the behaviour of electromagnetic hadron formfactors for low $Q^2$ are thus sensitive probes of the nonperturbative structure of the QCD vacuum.
|
1210.6136
|
Alka Upadhyay
|
M. Batra and A. Upadhyay
|
Strange and nonstrange sea quark-gluon effects in nucleons
|
11 Pages, No figures, Nuclear Physics A(Accepted)
|
Nuclear Physics A, 922, (2014)126
|
10.1016/j.nuclphysa.2013.11.008
| null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
Probabilities of various Fock states with strange and nonstrange quark-gluon
sea contents are calculated to probe the hadronic structure. Particularly for
nucleon, we find various contributions to the low energy properties from
scalar, vector and tensor sea in addition to three valence quarks. We focus on
the importance of individual sea contributions to the low energy parameters of
nucleon by taking the strange and non strange quark-gluon content to the hadron
sea. We confirm that the extended Fock space wavefunction is capable of
explaining the experimental results where vector sea plays a crucial role in
studying hadronic structure while scalar and tensor sea appears to be less
dominating due to quark-spin flip process but cannot be neglected. Some of the
properties like spin distribution and gA/gV ratio seem to be the most affected
by the change in the statistically determined coefficients. Detailed analysis
includes different approximations within the statistical approach to test the
validity of the model chosen. Phenomenological implication of such sea
affecting these properties is also discussed and the results are compared with
the experiments.
|
[
{
"created": "Tue, 23 Oct 2012 06:15:40 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jul 2013 08:28:07 GMT",
"version": "v2"
},
{
"created": "Sat, 16 Nov 2013 03:43:23 GMT",
"version": "v3"
}
] |
2015-06-11
|
[
[
"Batra",
"M.",
""
],
[
"Upadhyay",
"A.",
""
]
] |
Probabilities of various Fock states with strange and nonstrange quark-gluon sea contents are calculated to probe the hadronic structure. Particularly for nucleon, we find various contributions to the low energy properties from scalar, vector and tensor sea in addition to three valence quarks. We focus on the importance of individual sea contributions to the low energy parameters of nucleon by taking the strange and non strange quark-gluon content to the hadron sea. We confirm that the extended Fock space wavefunction is capable of explaining the experimental results where vector sea plays a crucial role in studying hadronic structure while scalar and tensor sea appears to be less dominating due to quark-spin flip process but cannot be neglected. Some of the properties like spin distribution and gA/gV ratio seem to be the most affected by the change in the statistically determined coefficients. Detailed analysis includes different approximations within the statistical approach to test the validity of the model chosen. Phenomenological implication of such sea affecting these properties is also discussed and the results are compared with the experiments.
|
1709.09878
|
Gennaro Corcella
|
Gennaro Corcella
|
Interpretation of the top-quark mass results
|
5 pages. Talk given at DIS 2017, April 3-7 2017, Birmingham, UK.
References fixed
| null | null | null |
hep-ph
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
I discuss recent work aimed at interpreting the top-quark mass measurements
at the LHC and determining the theoretical uncertainty.
|
[
{
"created": "Thu, 28 Sep 2017 09:55:16 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Nov 2017 08:04:00 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Nov 2017 15:13:07 GMT",
"version": "v3"
}
] |
2017-11-30
|
[
[
"Corcella",
"Gennaro",
""
]
] |
I discuss recent work aimed at interpreting the top-quark mass measurements at the LHC and determining the theoretical uncertainty.
|
gr-qc/0610082
|
Roman Konoplya
|
R. A. Konoplya
|
Particle motion around magnetized black holes: Preston-Poisson
space-time
|
6 pages, RevTex, the version accepted for publication in Phys. Rev. D
|
Phys.Rev.D74:124015,2006
|
10.1103/PhysRevD.74.124015
| null |
gr-qc astro-ph hep-th
| null |
We analyze motion of massless and massive particles around black holes
immersed in an asymptotically uniform magnetic field and surrounded by some
mechanical structure, which provides the magnetic field. The space-time is
described by Preston-Poisson metric, which is the generalization of the
well-known Ernst metric with a new parameter, tidal force, characterizing the
surrounding structure. The Hamilton-Jacobi equations allow separation of
variables in the equatorial plane. The presence of tidal force from
surroundings considerably changes parameters of the test particle motion: it
increases the radius of circular orbits of particles, increases the binding
energy of massive particles going from a given circular orbits to the innermost
stable orbit near black hole. In addition, it increases the distance of minimal
approach, time delay and bending angle for a ray of light propagating near
black hole.
|
[
{
"created": "Mon, 16 Oct 2006 13:15:14 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Dec 2006 18:19:50 GMT",
"version": "v2"
}
] |
2008-11-26
|
[
[
"Konoplya",
"R. A.",
""
]
] |
We analyze motion of massless and massive particles around black holes immersed in an asymptotically uniform magnetic field and surrounded by some mechanical structure, which provides the magnetic field. The space-time is described by Preston-Poisson metric, which is the generalization of the well-known Ernst metric with a new parameter, tidal force, characterizing the surrounding structure. The Hamilton-Jacobi equations allow separation of variables in the equatorial plane. The presence of tidal force from surroundings considerably changes parameters of the test particle motion: it increases the radius of circular orbits of particles, increases the binding energy of massive particles going from a given circular orbits to the innermost stable orbit near black hole. In addition, it increases the distance of minimal approach, time delay and bending angle for a ray of light propagating near black hole.
|
hep-ph/0204189
|
M. N. Rebelo
|
G. C. Branco, T. Morozumi, B. M. Nobre and M. N. Rebelo
|
Leptogenesis and Low Energy CP Violation
|
Talk given at the RTN meeting : ``Across the Present Energy Frontier
: Probing the Origin of Mass'', Corfu, Greece, 10 September- 13 September
2001
| null | null | null |
hep-ph
| null |
We discuss the possibility of relating the size and sign of the observed
baryon asymmetry of the universe to CP violation observable at low energies, in
a framework where the observed baryon asymmetry is produced by leptogenesis
through out of equilibrium decay of heavy Majorana neutrinos. We have shown
that although in general such a connection cannot be established, there are
specific frameworks where a link does exist. Furthermore, we identify the CP
violating phases relevant to leptogenesis and those relevant for low energy CP
violation and build weak basis invariant conditions for CP conservation.
|
[
{
"created": "Tue, 16 Apr 2002 15:26:39 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Branco",
"G. C.",
""
],
[
"Morozumi",
"T.",
""
],
[
"Nobre",
"B. M.",
""
],
[
"Rebelo",
"M. N.",
""
]
] |
We discuss the possibility of relating the size and sign of the observed baryon asymmetry of the universe to CP violation observable at low energies, in a framework where the observed baryon asymmetry is produced by leptogenesis through out of equilibrium decay of heavy Majorana neutrinos. We have shown that although in general such a connection cannot be established, there are specific frameworks where a link does exist. Furthermore, we identify the CP violating phases relevant to leptogenesis and those relevant for low energy CP violation and build weak basis invariant conditions for CP conservation.
|
gr-qc/0301125
|
Jiro Soda
|
Jiro Soda, Sugumi Kanno
|
Non-linear Gravity on Branes and Effective Action
|
5 pages, talk presented at The 12th Workshop on General Relativity
and Gravitation, Tokyo, Japan, November, 2002
| null | null |
KUCP0224
|
gr-qc
| null |
We develop the general formalism to study the low energy regime of the brane
world. We apply our formalism to the single brane model where the AdS/CFT
correspondence will take an important role. We also consider the two-brane
system and show the system is described by the quasi-scalar tensor gravity. Our
result provides a basis for predicting CMB fluctuations in the braneworld
models.
|
[
{
"created": "Fri, 31 Jan 2003 07:36:02 GMT",
"version": "v1"
}
] |
2007-05-23
|
[
[
"Soda",
"Jiro",
""
],
[
"Kanno",
"Sugumi",
""
]
] |
We develop the general formalism to study the low energy regime of the brane world. We apply our formalism to the single brane model where the AdS/CFT correspondence will take an important role. We also consider the two-brane system and show the system is described by the quasi-scalar tensor gravity. Our result provides a basis for predicting CMB fluctuations in the braneworld models.
|
gr-qc/0205002
|
Hideo Kodama
|
Hideo Kodama (Kyoto Univ.)
|
Rigidity theorems in the braneworld model
|
7 pages in LaTeX with the PTP style. No figure. To be published in
the proceedings of the workshop "Braneworld -- Dynamics of spacetime with
boundary --"
|
Prog.Theor.Phys.Suppl.148:277-283,2003
|
10.1143/PTPS.148.277
| null |
gr-qc hep-th
| null |
In the present paper, we give some theorems representing ridigity of a vacuum
brane in static bulk spacetimes. As an application, we show that a static bulk
spacetime with dimension D>3 and spatial symmetry IO(D-2), O(D-1) or O_+(D-2,1)
does not allow a vacuum brane with a black hole on it. We also show that if a
static bulk spacetime with dimension D>4 satsifying the vacuum Einstein
equations can be foliated by a continuous family of vacuum branes with
asymptotically constant curvature, it is a black string solution.
|
[
{
"created": "Wed, 1 May 2002 07:19:49 GMT",
"version": "v1"
}
] |
2008-11-26
|
[
[
"Kodama",
"Hideo",
"",
"Kyoto Univ."
]
] |
In the present paper, we give some theorems representing ridigity of a vacuum brane in static bulk spacetimes. As an application, we show that a static bulk spacetime with dimension D>3 and spatial symmetry IO(D-2), O(D-1) or O_+(D-2,1) does not allow a vacuum brane with a black hole on it. We also show that if a static bulk spacetime with dimension D>4 satsifying the vacuum Einstein equations can be foliated by a continuous family of vacuum branes with asymptotically constant curvature, it is a black string solution.
|
1806.00891
|
Volker Perlick
|
Volker Perlick, Claus L\"ammerzahl, Alfredo Macias
|
Effects of non-linear vacuum electrodynamics on the polarization plane
of light
|
Minor revisions; 12 pages, no figures
|
Phys. Rev. D 98, 105014 (2018)
|
10.1103/PhysRevD.98.105014
| null |
gr-qc
|
http://arxiv.org/licenses/nonexclusive-distrib/1.0/
|
We consider the Pleba{\'n}ski class of nonlinear theories of vacuum
electrodynamics, i.e., Lagrangian theories that are Lorentz invariant and gauge
invariant. Our main goal is to derive the transport law of the polarization
plane in such a theory, on an unspecified general-relativistic spacetime and
with an unspecified electromagnetic background field. To that end we start out
from an approximate-plane-harmonic-wave ansatz that takes the generation of
higher harmonics into account. By this ansatz, the electromagnetic field is
written as an asymptotic series with respect to a parameter $\alpha$, where the
limit $\alpha \to 0$ corresponds to sending the frequency to infinity. We
demonstrate that by solving the generalized Maxwell equations to zeroth and
first order with respect to $\alpha$ one gets a unique transport law for the
polarization plane along each light ray. We exemplify the general results with
the Born-Infeld theory.
|
[
{
"created": "Sun, 3 Jun 2018 23:01:26 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Nov 2018 01:23:57 GMT",
"version": "v2"
}
] |
2018-12-05
|
[
[
"Perlick",
"Volker",
""
],
[
"Lämmerzahl",
"Claus",
""
],
[
"Macias",
"Alfredo",
""
]
] |
We consider the Pleba{\'n}ski class of nonlinear theories of vacuum electrodynamics, i.e., Lagrangian theories that are Lorentz invariant and gauge invariant. Our main goal is to derive the transport law of the polarization plane in such a theory, on an unspecified general-relativistic spacetime and with an unspecified electromagnetic background field. To that end we start out from an approximate-plane-harmonic-wave ansatz that takes the generation of higher harmonics into account. By this ansatz, the electromagnetic field is written as an asymptotic series with respect to a parameter $\alpha$, where the limit $\alpha \to 0$ corresponds to sending the frequency to infinity. We demonstrate that by solving the generalized Maxwell equations to zeroth and first order with respect to $\alpha$ one gets a unique transport law for the polarization plane along each light ray. We exemplify the general results with the Born-Infeld theory.
|
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