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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1412.6729 | Sunil Maharaj | G. Abebe, K. S. Govinder, S. D. Maharaj | Lie symmetries for a conformally flat radiating star | 12 pages, submitted for publication | Int. J. Theor. Phys. 52: 3244-3254 (2013) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a relativistic radiating spherical star in conformally flat
spacetimes. In particular we study the junction condition relating the radial
pressure to the heat flux at the boundary of the star which is a nonlinear
partial differential equation. The Lie symmetry generators that leave the
equation invariant ... | [
{
"created": "Sun, 21 Dec 2014 06:13:25 GMT",
"version": "v1"
}
] | 2014-12-23 | [
[
"Abebe",
"G.",
""
],
[
"Govinder",
"K. S.",
""
],
[
"Maharaj",
"S. D.",
""
]
] | We consider a relativistic radiating spherical star in conformally flat spacetimes. In particular we study the junction condition relating the radial pressure to the heat flux at the boundary of the star which is a nonlinear partial differential equation. The Lie symmetry generators that leave the equation invariant ar... |
2201.08305 | Zipeng Wang | Zipeng Wang, Thomas Helfer, Katy Clough, Emanuele Berti | Superradiance in massive vector fields with spatially varying mass | 13 pages, 9 figures, 2 tables | null | 10.1103/PhysRevD.105.104055 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superradiance is a process by which massive bosonic particles can extract
energy from spinning black holes, leading to the build up of a "cloud" if the
particle has a Compton wavelength comparable to the black hole's Schwarzschild
radius. One interesting possibility is that superradiance may occur for photons
in a di... | [
{
"created": "Thu, 20 Jan 2022 17:19:17 GMT",
"version": "v1"
},
{
"created": "Wed, 25 May 2022 19:00:35 GMT",
"version": "v2"
}
] | 2022-06-08 | [
[
"Wang",
"Zipeng",
""
],
[
"Helfer",
"Thomas",
""
],
[
"Clough",
"Katy",
""
],
[
"Berti",
"Emanuele",
""
]
] | Superradiance is a process by which massive bosonic particles can extract energy from spinning black holes, leading to the build up of a "cloud" if the particle has a Compton wavelength comparable to the black hole's Schwarzschild radius. One interesting possibility is that superradiance may occur for photons in a diff... |
gr-qc/9901006 | George Emanuel Avraam Matsas | Luis C.B. Crispino, Atsushi Higuchi, and George E.A. Matsas | Scalar radiation emitted from a source rotating around a black hole | 19 pages (REVTEX), 5 figures, title slightly changed, extra
demonstration and minor improvements included. To appear in Class. Quant.
Grav | null | 10.1088/0264-9381/17/1/303 | IFT-P.008/99 | gr-qc astro-ph hep-th | null | We analyze the scalar radiation emitted from a source rotating around a
Schwarzschild black hole using the framework of quantum field theory at the
tree level. We show that for relativistic circular orbits the emitted power is
about 20% to 30% smaller than what would be obtained in Minkowski spacetime. We
also show t... | [
{
"created": "Tue, 5 Jan 1999 11:22:40 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Apr 1999 18:06:37 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Oct 1999 12:07:40 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Crispino",
"Luis C. B.",
""
],
[
"Higuchi",
"Atsushi",
""
],
[
"Matsas",
"George E. A.",
""
]
] | We analyze the scalar radiation emitted from a source rotating around a Schwarzschild black hole using the framework of quantum field theory at the tree level. We show that for relativistic circular orbits the emitted power is about 20% to 30% smaller than what would be obtained in Minkowski spacetime. We also show tha... |
1604.02154 | Marco Sampaio | Fl\'avio S. Coelho and Marco O. P. Sampaio | Radiation from a D-dimensional collision of shock waves: Two dimensional
reduction and Carter-Penrose diagram | 20 pages, 3 figures. To appear in a Special Issue of the IJMPD on
Selected Papers of the III Amazonian Symposium on Physics (Eds. C. Herdeiro,
E. Berti, V. Cardoso, L. C. Crispino, L. Gualtieri and U. Sperhake) | null | 10.1142/S0218271816410108 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the causal structure of the two dimensional (2D) reduced
background used in the perturbative treatment of a head-on collision of two
$D$-dimensional Aichelburg-Sexl gravitational shock waves. After defining all
causal boundaries, namely the future light-cone of the collision and the past
light-cone of a fu... | [
{
"created": "Thu, 7 Apr 2016 20:00:14 GMT",
"version": "v1"
}
] | 2016-08-17 | [
[
"Coelho",
"Flávio S.",
""
],
[
"Sampaio",
"Marco O. P.",
""
]
] | We analyse the causal structure of the two dimensional (2D) reduced background used in the perturbative treatment of a head-on collision of two $D$-dimensional Aichelburg-Sexl gravitational shock waves. After defining all causal boundaries, namely the future light-cone of the collision and the past light-cone of a futu... |
gr-qc/9407023 | Paul Henry Casper | Bruce Allen, Paul Casper, and Adrian Ottewill | Closed Form Expression for the Momentum Radiated from Cosmic String
Loops | 17 pages, RevTex 3.0, 3 postscript figures and C-language computer
code available via anonymous ftp from directory pub/pcasper at
alpha1.csd.uwm.edu, WISC-MILW-94-TH-15 | Phys.Rev. D51 (1995) 1546-1552 | 10.1103/PhysRevD.51.1546 | null | gr-qc astro-ph | null | We modify the recent analytic formula given by Allen and Casper for the rate
at which piecewise linear cosmic string loops lose energy to gravitational
radiation to yield the analogous analytic formula for the rate at which loops
radiate momentum. The resulting formula (which is exact when the effects of
gravitationa... | [
{
"created": "Tue, 19 Jul 1994 15:17:14 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Allen",
"Bruce",
""
],
[
"Casper",
"Paul",
""
],
[
"Ottewill",
"Adrian",
""
]
] | We modify the recent analytic formula given by Allen and Casper for the rate at which piecewise linear cosmic string loops lose energy to gravitational radiation to yield the analogous analytic formula for the rate at which loops radiate momentum. The resulting formula (which is exact when the effects of gravitational ... |
2106.08236 | Felipe Asenjo | Felipe A. Asenjo and Sergio A. Hojman | Light--like propagation of self--interacting Klein--Gordon fields in
cosmology | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is showed that complex scalar fields with a self-interaction potential may
propagate along null geodesics on flat Friedmann--Lema\^itre--Robertson--Walker
universes with different time-dependent scale factors. This occurs provided
they self interact adequately, for different forms of potentials, and
even for the... | [
{
"created": "Tue, 15 Jun 2021 15:40:59 GMT",
"version": "v1"
}
] | 2021-06-16 | [
[
"Asenjo",
"Felipe A.",
""
],
[
"Hojman",
"Sergio A.",
""
]
] | It is showed that complex scalar fields with a self-interaction potential may propagate along null geodesics on flat Friedmann--Lema\^itre--Robertson--Walker universes with different time-dependent scale factors. This occurs provided they self interact adequately, for different forms of potentials, and even for the mas... |
0908.1835 | Edward Glass | J.P. Krisch and E.N. Glass | Counter-rotating Kerr manifolds separated by a fluid shell | null | Class. Quantum Grav. vol 26 175010 (2009) | 10.1088/0264-9381/26/17/175010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a spheroidal fluid shell between two Kerr vacuum regions which
have opposite rotation parameters. The shell has a stiff equation of state and
a heat flow vector related to the rotational Killing current. The shell
description is useful in exploring the significance of counter-rotation in Kerr
metric match... | [
{
"created": "Thu, 13 Aug 2009 05:15:11 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Krisch",
"J. P.",
""
],
[
"Glass",
"E. N.",
""
]
] | We describe a spheroidal fluid shell between two Kerr vacuum regions which have opposite rotation parameters. The shell has a stiff equation of state and a heat flow vector related to the rotational Killing current. The shell description is useful in exploring the significance of counter-rotation in Kerr metric matches... |
gr-qc/0002048 | Georges F. Bressange | C. Barrab\`es, G. F. Bressange and P. A. Hogan | Colliding Plane Impulsive Gravitational Waves | 21 pages, LaTeX2e | Prog.Theor.Phys. 102 (1999) 1085-1101 | 10.1143/PTP.102.1085 | null | gr-qc | null | When two non-interacting plane impulsive gravitational waves undergo a
head-on collision, the vacuum interaction region between the waves after the
collision contains backscattered gravitational radiation from both waves. The
two systems of backscattered waves have each got a family of rays (null
geodesics) associate... | [
{
"created": "Mon, 14 Feb 2000 15:25:43 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Barrabès",
"C.",
""
],
[
"Bressange",
"G. F.",
""
],
[
"Hogan",
"P. A.",
""
]
] | When two non-interacting plane impulsive gravitational waves undergo a head-on collision, the vacuum interaction region between the waves after the collision contains backscattered gravitational radiation from both waves. The two systems of backscattered waves have each got a family of rays (null geodesics) associated ... |
1408.4738 | Yurii Ignatyev | Yu.G. Ignatyev and A.A. Agathonov | Numerical Models of Cosmological Evolution of the Degenerated
Fermi-system of Scalar Charged Particles | 15 pages, 14 figures, 4 references | null | 10.1134/S0202289315020048 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on mathematical model of the statistical Fermi system with the
interparticle interaction which was constructed in the previous articles, this
work offers the construction and analysis of the numerical models of
cosmological evolution of the single-component degenerated Fermi system of the
scalar particles. The ... | [
{
"created": "Wed, 20 Aug 2014 17:38:47 GMT",
"version": "v1"
}
] | 2023-07-19 | [
[
"Ignatyev",
"Yu. G.",
""
],
[
"Agathonov",
"A. A.",
""
]
] | Based on mathematical model of the statistical Fermi system with the interparticle interaction which was constructed in the previous articles, this work offers the construction and analysis of the numerical models of cosmological evolution of the single-component degenerated Fermi system of the scalar particles. The ap... |
1909.07824 | Christian Corda Prof. | F. Feleppa, I. Licata and C. Corda | Hartle-Hawking boundary conditions as Nucleation by de Sitter Vacuum | 23 pages, 2 figures, accepted for publication in Physics of the Dark
Universe | Phys. Dark Un. 26, 100381 (2019) | 10.1016/j.dark.2019.100381 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that, for a de Sitter Universe, the Hartle-Hawking (HH) wave
function can be obtained in a simple way starting from the
Friedmann-Lemaitre-Robertson-Walker (FLRW) line element of cosmological
equations. An oscillator having imaginary time is indeed derived starting from
the Hamiltonian obtaining the HH co... | [
{
"created": "Sun, 15 Sep 2019 15:03:26 GMT",
"version": "v1"
}
] | 2019-09-20 | [
[
"Feleppa",
"F.",
""
],
[
"Licata",
"I.",
""
],
[
"Corda",
"C.",
""
]
] | It is shown that, for a de Sitter Universe, the Hartle-Hawking (HH) wave function can be obtained in a simple way starting from the Friedmann-Lemaitre-Robertson-Walker (FLRW) line element of cosmological equations. An oscillator having imaginary time is indeed derived starting from the Hamiltonian obtaining the HH cond... |
0708.3317 | Sunil Maharaj | R. Sharma and S. D. Maharaj | On surface tension for compact stars | 8 pages, To appear in J. Astrophys. Astron | J. Astrophys. Astron. 28 (2007) 133-138 | 10.1007/s12036-007-0010-x | null | gr-qc | null | In an earlier treatment it was demonstrated that general relativity gives
higher values of surface tension in strange stars with quark matter than
neutron stars.We generate the modified Tolman-Oppenheimer-Volkoff equation to
incorporate anisotropic matter and use this to show that pressure anisotropy
provides for a w... | [
{
"created": "Fri, 24 Aug 2007 11:40:05 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Sharma",
"R.",
""
],
[
"Maharaj",
"S. D.",
""
]
] | In an earlier treatment it was demonstrated that general relativity gives higher values of surface tension in strange stars with quark matter than neutron stars.We generate the modified Tolman-Oppenheimer-Volkoff equation to incorporate anisotropic matter and use this to show that pressure anisotropy provides for a wid... |
2307.14156 | Zhuan Ning | Zhuan Ning, Qian Chen, Yu Tian, Xiaoning Wu, Hongbao Zhang | Spontaneous Deformation of an AdS Spherical Black Hole | 16 pages, 9 figures; Eq. (30) and (A7) corrected, figures and details
added, version to appear in PRD | Phys. Rev. D 109 (2024) 6, 064082 | 10.1103/PhysRevD.109.064082 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we investigate the real-time dynamics during the spontaneous
deformation of an unstable spherical black hole in asymptotically anti-de
Sitter (AdS) spacetime. For the initial value, the static solutions with
spherical symmetry are obtained numerically, revealing the presence of a
spinodal region in the... | [
{
"created": "Wed, 26 Jul 2023 12:36:23 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jul 2023 13:15:43 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Mar 2024 12:31:34 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Mar 2024 01:07:36 GMT",
"version": "v4"
}
] | 2024-03-29 | [
[
"Ning",
"Zhuan",
""
],
[
"Chen",
"Qian",
""
],
[
"Tian",
"Yu",
""
],
[
"Wu",
"Xiaoning",
""
],
[
"Zhang",
"Hongbao",
""
]
] | In this study, we investigate the real-time dynamics during the spontaneous deformation of an unstable spherical black hole in asymptotically anti-de Sitter (AdS) spacetime. For the initial value, the static solutions with spherical symmetry are obtained numerically, revealing the presence of a spinodal region in the p... |
1406.0624 | Mohamad Atazadeh | K. Atazadeh, A. Eghbali | Brane cosmology in teleparallel and $f(T)$ gravity | 13 pages, 1 figure, 1 table, published version | Phys. Scr. 90 (2015) 045001 | 10.1088/0031-8949/90/4/045001 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We consider the cosmology of a brane-world scenario in the framework of
teleparallel and $f(T)$ gravity in a way that matter is localized on the brane.
We show that the cosmology of such branes is different from the standard
cosmology in teleparallelism. In particular, we obtain a class of new solutions
with a consta... | [
{
"created": "Tue, 3 Jun 2014 08:36:38 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Apr 2015 09:04:03 GMT",
"version": "v2"
}
] | 2015-04-02 | [
[
"Atazadeh",
"K.",
""
],
[
"Eghbali",
"A.",
""
]
] | We consider the cosmology of a brane-world scenario in the framework of teleparallel and $f(T)$ gravity in a way that matter is localized on the brane. We show that the cosmology of such branes is different from the standard cosmology in teleparallelism. In particular, we obtain a class of new solutions with a constant... |
1909.13450 | Hamed Pejhan | Hamed Pejhan, Mohammad Enayati, Jean-Pierre Gazeau, and Anzhong Wang | "Massive" Rarita-Schwinger field in de Sitter space | 17 pages, no figure, version accepted for publication in Physical
Review D | Phys. Rev. D 100, 125022 (2019) | 10.1103/PhysRevD.100.125022 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a covariant quantization of the "massive" spin-${\frac{3}{2}}$
Rarita-Schwinger field in de Sitter (dS) spacetime. The dS group representation
theory and its Wigner interpretation combined with the
Wightman-G$\mbox{\"{a}}$rding axiomatic and analyticity requirements in the
complexified pseudo-Riemanian man... | [
{
"created": "Mon, 30 Sep 2019 04:21:15 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Dec 2019 03:41:24 GMT",
"version": "v2"
},
{
"created": "Sun, 22 Dec 2019 01:38:26 GMT",
"version": "v3"
}
] | 2020-01-01 | [
[
"Pejhan",
"Hamed",
""
],
[
"Enayati",
"Mohammad",
""
],
[
"Gazeau",
"Jean-Pierre",
""
],
[
"Wang",
"Anzhong",
""
]
] | We present a covariant quantization of the "massive" spin-${\frac{3}{2}}$ Rarita-Schwinger field in de Sitter (dS) spacetime. The dS group representation theory and its Wigner interpretation combined with the Wightman-G$\mbox{\"{a}}$rding axiomatic and analyticity requirements in the complexified pseudo-Riemanian manif... |
gr-qc/9801022 | Pasi Tapio Repo | Jarmo Makela | Variation of Area Variables in Regge Calculus | 8 pages, no figures | Class.Quant.Grav. 17 (2000) 4991-4998 | 10.1088/0264-9381/17/24/304 | JYFL preprint 17/97 | gr-qc | null | We consider the possibility to use the areas of two-simplexes, instead of
lengths of edges, as the dynamical variables of Regge calculus. We show that if
the action of Regge calculus is varied with respect to the areas of
two-simplexes, and appropriate constraints are imposed between the variations,
the Einstein-Regg... | [
{
"created": "Fri, 9 Jan 1998 12:11:21 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Makela",
"Jarmo",
""
]
] | We consider the possibility to use the areas of two-simplexes, instead of lengths of edges, as the dynamical variables of Regge calculus. We show that if the action of Regge calculus is varied with respect to the areas of two-simplexes, and appropriate constraints are imposed between the variations, the Einstein-Regge ... |
0705.3933 | Subenoy Chakraborty | Asit Banerjee, Tanwi Bandyopadhyay and Subenoy Chakraborty | Emergent Universe in Brane World Scenario | 4 pages, no figure | Grav.Cosmol.13:290-292,2007 | null | null | gr-qc | null | A model of an emergent universe is obtained in brane world. Here the bulk
energy is in the form of cosmological constant, while the brane consists of the
Chaplygin gas with the modified equation of state such as $p=A\rho-B/\rho$.
Initially the brane matter for the special choice $A=1/3$ may have negative or
positive ... | [
{
"created": "Sun, 27 May 2007 06:36:22 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Banerjee",
"Asit",
""
],
[
"Bandyopadhyay",
"Tanwi",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | A model of an emergent universe is obtained in brane world. Here the bulk energy is in the form of cosmological constant, while the brane consists of the Chaplygin gas with the modified equation of state such as $p=A\rho-B/\rho$. Initially the brane matter for the special choice $A=1/3$ may have negative or positive pr... |
gr-qc/0211062 | Pavlov | Yu. V. Pavlov | The Hamilton Operator and Quantum Vacuum for Nonconformal Scalar Fields
in the Homogeneous and Isotropic Space | Talk at S.Kovalevski Symposium (Stockholm University, June 2000).
LaTeX, 10 pages, no figures | Oper.Theor.Advan.Appl.132:323-332,2002 | null | null | gr-qc | null | The diagonalization of the metrical and canonical Hamilton operators of a
scalar field with an arbitrary coupling, with a curvature in N-dimensional
homogeneous isotropic space is considered in this paper. The energy spectrum of
the corresponding quasiparticles is obtained and then the modified
energy-momentum tensor... | [
{
"created": "Mon, 18 Nov 2002 11:34:02 GMT",
"version": "v1"
}
] | 2011-04-20 | [
[
"Pavlov",
"Yu. V.",
""
]
] | The diagonalization of the metrical and canonical Hamilton operators of a scalar field with an arbitrary coupling, with a curvature in N-dimensional homogeneous isotropic space is considered in this paper. The energy spectrum of the corresponding quasiparticles is obtained and then the modified energy-momentum tensor i... |
2203.05663 | Stefano Bondani | Stefano Bondani, Francesco Haardt, Alberto Sesana, Enrico Barausse,
Massimo Dotti | On the detectability of gravitational waves from primordial black holes
orbiting Sgr A* | 10 pages, 11 figures; Referee reviewed | Phys. Rev. D 106, 043015, 2022 | 10.1103/PhysRevD.106.043015 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we characterize the expected gravitational wave signal
detectable by the planned space-borne interferometer LISA and the proposed next
generation space-borne interferometer $\mu$Ares arising from a population of
primordial black holes orbiting Sgr A*, the super-massive black hole at the
Galactic center. ... | [
{
"created": "Thu, 10 Mar 2022 22:18:46 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Aug 2022 13:36:05 GMT",
"version": "v2"
}
] | 2022-08-16 | [
[
"Bondani",
"Stefano",
""
],
[
"Haardt",
"Francesco",
""
],
[
"Sesana",
"Alberto",
""
],
[
"Barausse",
"Enrico",
""
],
[
"Dotti",
"Massimo",
""
]
] | In this work we characterize the expected gravitational wave signal detectable by the planned space-borne interferometer LISA and the proposed next generation space-borne interferometer $\mu$Ares arising from a population of primordial black holes orbiting Sgr A*, the super-massive black hole at the Galactic center. As... |
1509.01825 | Edward Malec | Jerzy Knopik, Patryk Mach and Edward Malec | General-relativistic rotation laws in rotating fluid bodies: constant
linear velocity | null | null | 10.5506/APhysPolB.46.2451 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New rotation laws have been recently found for general-relativistic
self-gravitating stationary fluids. It was not clear whether they apply to
systems rotating with a constant linear velocity. In this paper we fill this
gap. The answer is positive. That means, in particular, that these systems
should exhibit the rece... | [
{
"created": "Sun, 6 Sep 2015 16:25:20 GMT",
"version": "v1"
}
] | 2016-01-20 | [
[
"Knopik",
"Jerzy",
""
],
[
"Mach",
"Patryk",
""
],
[
"Malec",
"Edward",
""
]
] | New rotation laws have been recently found for general-relativistic self-gravitating stationary fluids. It was not clear whether they apply to systems rotating with a constant linear velocity. In this paper we fill this gap. The answer is positive. That means, in particular, that these systems should exhibit the recent... |
1905.02748 | Sharmila Gunasekaran | Sharmila Gunasekaran, Ivan Booth | Horizons as boundary conditions in spherical symmetry | 14 pages, V3 - published version, small changes to IV B) | Phys. Rev. D 100, 064019 (2019) | 10.1103/PhysRevD.100.064019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We initiate the development of a horizon-based initial (or rather final)
value formalism to describe the geometry and physics of the near-horizon
spacetime: data specified on the horizon and a future ingoing null boundary
determine the near-horizon geometry. In this initial paper we restrict our
attention to spherica... | [
{
"created": "Tue, 7 May 2019 18:11:11 GMT",
"version": "v1"
},
{
"created": "Fri, 24 May 2019 11:15:00 GMT",
"version": "v2"
},
{
"created": "Tue, 30 Mar 2021 16:16:49 GMT",
"version": "v3"
}
] | 2021-03-31 | [
[
"Gunasekaran",
"Sharmila",
""
],
[
"Booth",
"Ivan",
""
]
] | We initiate the development of a horizon-based initial (or rather final) value formalism to describe the geometry and physics of the near-horizon spacetime: data specified on the horizon and a future ingoing null boundary determine the near-horizon geometry. In this initial paper we restrict our attention to sphericall... |
2210.10295 | Nikolaos Dimakis | N. Dimakis, M. Roumeliotis, A. Paliathanasis, P.S. Apostolopoulos and
T. Christodoulakis | Self-similar Cosmological Solutions in Symmetric Teleparallel theory:
Friedmann-Lema\^itre-Robertson-Walker spacetimes | 25 pages, no figures, Latex2e source file, PRD accepted version | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of self-similar solutions is discussed in symmetric
teleparallel $f(Q)$-theory for a Friedmann-Lema\^itre-Robertson-Walker
background geometry with zero and non-zero spatial curvature. For the four
distinct families of connections which describe the specific cosmology in
symmetric teleparallel gravity, ... | [
{
"created": "Wed, 19 Oct 2022 04:44:07 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Nov 2022 03:09:21 GMT",
"version": "v2"
}
] | 2022-12-01 | [
[
"Dimakis",
"N.",
""
],
[
"Roumeliotis",
"M.",
""
],
[
"Paliathanasis",
"A.",
""
],
[
"Apostolopoulos",
"P. S.",
""
],
[
"Christodoulakis",
"T.",
""
]
] | The existence of self-similar solutions is discussed in symmetric teleparallel $f(Q)$-theory for a Friedmann-Lema\^itre-Robertson-Walker background geometry with zero and non-zero spatial curvature. For the four distinct families of connections which describe the specific cosmology in symmetric teleparallel gravity, th... |
1301.2571 | Tharanath R | R Tharanath and V C Kuriakose | Thermodynamics and Spectroscopy of Schwarzschild black hole surrounded
by Quintessence | 11 pages and 4 figures | Modern Physics Letters A (2013) | 10.1142/S021773231350003X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thermodynamic and spectroscopic behaviour of Schwarzschild black hole
surrounded by quintessence are studied. We have derived the thermodynamic
quantities and studied their behaviour for different values of quintessence
parameter. We put the background space-time into the Kruskal-like coordinate to
find the perio... | [
{
"created": "Fri, 11 Jan 2013 18:36:38 GMT",
"version": "v1"
}
] | 2013-01-14 | [
[
"Tharanath",
"R",
""
],
[
"Kuriakose",
"V C",
""
]
] | The thermodynamic and spectroscopic behaviour of Schwarzschild black hole surrounded by quintessence are studied. We have derived the thermodynamic quantities and studied their behaviour for different values of quintessence parameter. We put the background space-time into the Kruskal-like coordinate to find the period ... |
gr-qc/9907061 | Lior M. Burko | Lior M. Burko | Strength of the null singularity inside black holes | RevTeX, 6 pages, no figures | Phys.Rev. D60 (1999) 104033 | 10.1103/PhysRevD.60.104033 | null | gr-qc | null | We study analytically the Cauchy horizon singularity inside
spherically-symmetric charged black holes, coupled to a spherical
self-gravitating, minimally-coupled, massless scalar field. We show that all
causal geodesics terminate at the Cauchy horizon at a null singularity, which
is weak according to the Tipler class... | [
{
"created": "Mon, 19 Jul 1999 17:58:07 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Burko",
"Lior M.",
""
]
] | We study analytically the Cauchy horizon singularity inside spherically-symmetric charged black holes, coupled to a spherical self-gravitating, minimally-coupled, massless scalar field. We show that all causal geodesics terminate at the Cauchy horizon at a null singularity, which is weak according to the Tipler classif... |
2212.01228 | Sergey L Cherkas | Sergey L. Cherkas and Vladimir L. Kalashnikov | AEther as an Inevitable Consequence of Quantum Gravity | 15 pages, 5 figures | Universe 2022, 8(12), 626 | 10.3390/universe8120626 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fact that quantum gravity does not admit an invariant vacuum state has
far-reaching consequences for all physics. It points out that space could not
be empty, and we return to the notion of an aether. Such a concept requires a
preferred reference frame for describing universe expansion and black holes.
Here, we i... | [
{
"created": "Tue, 29 Nov 2022 09:55:39 GMT",
"version": "v1"
}
] | 2022-12-05 | [
[
"Cherkas",
"Sergey L.",
""
],
[
"Kalashnikov",
"Vladimir L.",
""
]
] | The fact that quantum gravity does not admit an invariant vacuum state has far-reaching consequences for all physics. It points out that space could not be empty, and we return to the notion of an aether. Such a concept requires a preferred reference frame for describing universe expansion and black holes. Here, we int... |
1105.4145 | Lorenzo Iorio | Lorenzo Iorio | Some considerations on the present-day results for the detection of
frame-dragging after the final outcome of GP-B | LaTex2e, 6 pages, 1 table, 5 figures, 36 references. Minor changes.
Version matching the one at press in Europhysics Letters (EPL) | Europhys.Lett.96:30001,2011 | 10.1209/0295-5075/96/30001 | null | gr-qc astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cancelation of the first even zonal harmonic coefficient J2 of the
multipolar expansion of the Newtonian part of the Earth's gravitational
potential from the linear combination f(2L) of the nodes of LAGEOS and LAGEOS
II used in the latest tests of the general relativistic Lense-Thirring effect
cannot be perfect, ... | [
{
"created": "Fri, 20 May 2011 18:11:49 GMT",
"version": "v1"
},
{
"created": "Mon, 23 May 2011 19:07:32 GMT",
"version": "v2"
},
{
"created": "Tue, 24 May 2011 14:16:02 GMT",
"version": "v3"
},
{
"created": "Mon, 8 Aug 2011 11:37:30 GMT",
"version": "v4"
},
{
"cr... | 2015-03-19 | [
[
"Iorio",
"Lorenzo",
""
]
] | The cancelation of the first even zonal harmonic coefficient J2 of the multipolar expansion of the Newtonian part of the Earth's gravitational potential from the linear combination f(2L) of the nodes of LAGEOS and LAGEOS II used in the latest tests of the general relativistic Lense-Thirring effect cannot be perfect, as... |
1410.0126 | Wei-Tou Ni | Wei-Tou Ni | Dilaton field and cosmic wave propagation | 16 pages, Physics Letters A in press | Physics Letters A 378 (2014) 3413-3418 | 10.1016/j.physleta.2014.09.049 | null | gr-qc astro-ph.CO hep-ph physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the electromagnetic wave propagation in the joint dilaton field and
axion field. Dilaton field induces amplification/attenuation in the propagation
while axion field induces polarization rotation. The amplification/attenuation
induced by dilaton is independent of the frequency (energy) and the
polarization o... | [
{
"created": "Wed, 1 Oct 2014 07:09:31 GMT",
"version": "v1"
}
] | 2014-11-04 | [
[
"Ni",
"Wei-Tou",
""
]
] | We study the electromagnetic wave propagation in the joint dilaton field and axion field. Dilaton field induces amplification/attenuation in the propagation while axion field induces polarization rotation. The amplification/attenuation induced by dilaton is independent of the frequency (energy) and the polarization of ... |
1803.10583 | Izzet Sakalli | \.Izzet Sakall{\i}, Kimet Jusufi, Ali \"Ovg\"un | Analytical Solutions in a Cosmic String Born-Infeld-dilaton Black Hole
Geometry: Quasinormal Modes and Quantization | Accepted for publication in General Relativity and Gravitation | Gen Relativ Gravit (2018) 50: 125 | 10.1007/s10714-018-2455-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Chargeless massive scalar fields are studied in the spacetime of Born-Infeld
dilaton black holes (BIDBHs). We first separate the massive covariant
Klein-Gordon equation into radial and angular parts and obtain the exact
solution of the radial equation in terms of the confluent Heun functions. Using
the obtained radia... | [
{
"created": "Wed, 28 Mar 2018 13:19:46 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Sep 2018 20:03:33 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Sep 2018 10:37:54 GMT",
"version": "v3"
}
] | 2018-09-14 | [
[
"Sakallı",
"İzzet",
""
],
[
"Jusufi",
"Kimet",
""
],
[
"Övgün",
"Ali",
""
]
] | Chargeless massive scalar fields are studied in the spacetime of Born-Infeld dilaton black holes (BIDBHs). We first separate the massive covariant Klein-Gordon equation into radial and angular parts and obtain the exact solution of the radial equation in terms of the confluent Heun functions. Using the obtained radial ... |
gr-qc/0507051 | H. D. Zeh | H. D. Zeh | Where has all the information gone? | 10 pages, 1 figure, Latex - Invited paper for a special Einstein
issue of Physics Letters A | Phys.Lett. A347 (2005) 1-7 | 10.1016/j.physleta.2005.05.065 | null | gr-qc hep-th quant-ph | null | The existence of spacetime singularities is irrelevant for the irreversible
appearance of black holes. However, confirmation of the latter's unitary
dynamics would require the preparation of a coherent superposition of a
tremendous number of appropriate ``Everett worlds''.
| [
{
"created": "Tue, 12 Jul 2005 10:15:40 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Zeh",
"H. D.",
""
]
] | The existence of spacetime singularities is irrelevant for the irreversible appearance of black holes. However, confirmation of the latter's unitary dynamics would require the preparation of a coherent superposition of a tremendous number of appropriate ``Everett worlds''. |
2301.10248 | Tiago V. Fernandes | Tiago V. Fernandes, David Hilditch, Jos\'e P. S. Lemos, V\'itor
Cardoso | Normal modes of Proca fields in AdS spacetime | 6 pages | Gen. Relativ. Gravit. 55, 5 (2023) | 10.1007/s10714-022-03052-w | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | A normal mode analysis for Proca fields in the anti-de Sitter (AdS) spacetime
is given. It is found that the equations for the Proca field can be decoupled
analytically. This is performed by changing the basis of the vector spherical
harmonics (VSH) decomposition. The normal modes and the normal mode frequencies
of t... | [
{
"created": "Tue, 24 Jan 2023 19:00:00 GMT",
"version": "v1"
}
] | 2023-01-26 | [
[
"Fernandes",
"Tiago V.",
""
],
[
"Hilditch",
"David",
""
],
[
"Lemos",
"José P. S.",
""
],
[
"Cardoso",
"Vítor",
""
]
] | A normal mode analysis for Proca fields in the anti-de Sitter (AdS) spacetime is given. It is found that the equations for the Proca field can be decoupled analytically. This is performed by changing the basis of the vector spherical harmonics (VSH) decomposition. The normal modes and the normal mode frequencies of the... |
1708.05576 | D\'aniel Barta | D\'aniel Barta, M\'aty\'as Vas\'uth | Dispersion of gravitational waves in cold spherical interstellar medium | null | Int. J. Mod. Phys. D 27 1850040 (2018) | 10.1142/S0218271818500402 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the propagation of locally plane, small-amplitude,
monochromatic gravitational waves through cold compressible interstellar gas in
order to provide a more accurate picture of expected waveforms for direct
detection. The quasi-isothermal gas is concentrated in a spherical symmetric
cloud held together b... | [
{
"created": "Fri, 18 Aug 2017 12:22:53 GMT",
"version": "v1"
}
] | 2018-06-11 | [
[
"Barta",
"Dániel",
""
],
[
"Vasúth",
"Mátyás",
""
]
] | We investigate the propagation of locally plane, small-amplitude, monochromatic gravitational waves through cold compressible interstellar gas in order to provide a more accurate picture of expected waveforms for direct detection. The quasi-isothermal gas is concentrated in a spherical symmetric cloud held together by ... |
gr-qc/0211086 | Miguel Sanchez | J.L. Flores and M. S\'anchez | Causality and Conjugate Points in General Plane Waves | Version improved with further discussions and a new section; 21
pages, Latex | Class.Quant.Grav. 20 (2003) 2275-2292 | null | null | gr-qc hep-th | null | Let $M = M_0 \times \R^2$ be a pp--wave type spacetime endowed with the
metric $<\cdot,\cdot>_z = <\cdot,\cdot>_x + 2 du dv + H(x,u) du^2$, where
$(M_0, <\cdot,\cdot>_x) $ is any Riemannian manifold and $H(x,u)$ an arbitrary
function. We show that the behaviour of $H(x,u)$ at spatial infinity determines
the causality... | [
{
"created": "Tue, 26 Nov 2002 17:47:42 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jun 2003 19:03:25 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Flores",
"J. L.",
""
],
[
"Sánchez",
"M.",
""
]
] | Let $M = M_0 \times \R^2$ be a pp--wave type spacetime endowed with the metric $<\cdot,\cdot>_z = <\cdot,\cdot>_x + 2 du dv + H(x,u) du^2$, where $(M_0, <\cdot,\cdot>_x) $ is any Riemannian manifold and $H(x,u)$ an arbitrary function. We show that the behaviour of $H(x,u)$ at spatial infinity determines the causality o... |
2210.16166 | Qihong Huang | Qihong Huang, Kaituo Zhang, He Huang, Bing Xu and Feiquan Tu | CMB power spectrum in the emergent universe with k-essence | null | Universe 2023, 9(5), 221 | 10.3390/universe9050221 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The emergent universe provides a possible method to avoid the big bang
singularity by considering that the universe stems from an stable Einstein
static universe rather than the singularity. Since the Einstein static universe
exists before inflation, it may leave some relics in the CMB power spectrum. In
this paper, ... | [
{
"created": "Fri, 28 Oct 2022 14:40:45 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jan 2023 04:17:15 GMT",
"version": "v2"
},
{
"created": "Wed, 10 May 2023 12:24:14 GMT",
"version": "v3"
}
] | 2023-05-11 | [
[
"Huang",
"Qihong",
""
],
[
"Zhang",
"Kaituo",
""
],
[
"Huang",
"He",
""
],
[
"Xu",
"Bing",
""
],
[
"Tu",
"Feiquan",
""
]
] | The emergent universe provides a possible method to avoid the big bang singularity by considering that the universe stems from an stable Einstein static universe rather than the singularity. Since the Einstein static universe exists before inflation, it may leave some relics in the CMB power spectrum. In this paper, we... |
1606.03886 | Ebrahim Yusofi Ramneti | M. Mohsenzadeh and E. Yusofi | Higher Order Corrections to Asymptotic-de Sitter Inflation | 7 pages, 3 figures, Accepted for publication in Chinese Physics C | Chin.Phys. C41 (2017) no.8 | 10.1088/1674-1137/41/8/085101 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since trans-Planckian considerations can be associated with the re-definition
of the initial vacuum, we investigate further the influence of trans-Planckian
physics on the spectra produced by the initial quasi-de Sitter (dS) state
during inflation. We use the asymptotic-dS mode to study the trans-Planckian
correction... | [
{
"created": "Mon, 13 Jun 2016 10:30:33 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2016 08:32:05 GMT",
"version": "v2"
},
{
"created": "Sat, 3 Jun 2017 09:44:45 GMT",
"version": "v3"
}
] | 2018-04-06 | [
[
"Mohsenzadeh",
"M.",
""
],
[
"Yusofi",
"E.",
""
]
] | Since trans-Planckian considerations can be associated with the re-definition of the initial vacuum, we investigate further the influence of trans-Planckian physics on the spectra produced by the initial quasi-de Sitter (dS) state during inflation. We use the asymptotic-dS mode to study the trans-Planckian correction o... |
1907.07336 | Yasutaka Koga | Yasutaka Koga, Tomohiro Harada | Stability of null orbits on photon spheres and photon surfaces | 9 pages | Phys. Rev. D 100, 064040 (2019) | 10.1103/PhysRevD.100.064040 | RUP-19-21 | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stability of a photon sphere, or stability of circular null geodesics on the
sphere, plays a key role in its applications to astrophysics. For instance, an
unstable photon sphere is responsible for determining the size of a black hole
shadow, while a stable photon sphere is inferred to cause the instability of
spacet... | [
{
"created": "Wed, 17 Jul 2019 05:14:34 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Sep 2019 03:03:50 GMT",
"version": "v2"
}
] | 2019-10-02 | [
[
"Koga",
"Yasutaka",
""
],
[
"Harada",
"Tomohiro",
""
]
] | Stability of a photon sphere, or stability of circular null geodesics on the sphere, plays a key role in its applications to astrophysics. For instance, an unstable photon sphere is responsible for determining the size of a black hole shadow, while a stable photon sphere is inferred to cause the instability of spacetim... |
0810.1903 | Jeffrey Winicour | Jeffrey Winicour | Characteristic Evolution and Matching | New version to appear in Living Reviews 2012. arXiv admin note:
updated version of arXiv:gr-qc/0508097 | null | 10.12942/lrr-2009-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I review the development of numerical evolution codes for general relativity
based upon the characteristic initial value problem. Progress in characteristic
evolution is traced from the early stage of 1D feasibility studies to 2D
axisymmetric codes that accurately simulate the oscillations and gravitational
collapse ... | [
{
"created": "Fri, 10 Oct 2008 15:19:34 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Oct 2008 15:04:42 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Aug 2011 14:05:10 GMT",
"version": "v3"
},
{
"created": "Thu, 12 Jan 2012 16:31:49 GMT",
"version": "v4"
}
] | 2017-01-04 | [
[
"Winicour",
"Jeffrey",
""
]
] | I review the development of numerical evolution codes for general relativity based upon the characteristic initial value problem. Progress in characteristic evolution is traced from the early stage of 1D feasibility studies to 2D axisymmetric codes that accurately simulate the oscillations and gravitational collapse of... |
1212.4049 | Sunandan Gangopadhyay | Sunandan Gangopadhyay | Noncommutative inspired Schwarzschild black hole, Voros product and
Komar energy | Presented at International Conference, COSGRAV12, Indian Statistical
Institute, Kolkata, India, Appeared in Journal of Physics: Conference Series | Journal of Physics : Conference Series 405 (2012) 012014 | 10.1088/1742-6596/405/1/012014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The importance of the Voros product in defining a noncommutative
Schwarzschild black hole is shown. The entropy is then computed and the area
law is shown to hold upto order $\frac{1}{\sqrt{\theta}}e^{-M^2/\theta}$. The
leading correction to the entropy (computed in the tunneling formalism) is
shown to be logarithmic... | [
{
"created": "Mon, 17 Dec 2012 16:14:12 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Gangopadhyay",
"Sunandan",
""
]
] | The importance of the Voros product in defining a noncommutative Schwarzschild black hole is shown. The entropy is then computed and the area law is shown to hold upto order $\frac{1}{\sqrt{\theta}}e^{-M^2/\theta}$. The leading correction to the entropy (computed in the tunneling formalism) is shown to be logarithmic. ... |
1906.01735 | Paul R. Anderson | Paul R. Anderson, Raymond D. Clark, Alessandro Fabbri, and Michael R.
R. Good | Late time approach to Hawking radiation: terms beyond leading order | Improved version, significant changes in the presentation, minor
errors corrected, main conclusions unchanged | Phys. Rev. D 100, 061703 (2019) | 10.1103/PhysRevD.100.061703 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole evaporation is studied using wave packets for the modes. These
allow for approximate frequency and time resolution. The leading order late
time behavior gives the well known Hawking radiation that is independent of how
the black hole formed. The focus here is on the higher order terms and the rate
at which... | [
{
"created": "Tue, 4 Jun 2019 21:47:33 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2019 14:26:39 GMT",
"version": "v2"
}
] | 2019-09-26 | [
[
"Anderson",
"Paul R.",
""
],
[
"Clark",
"Raymond D.",
""
],
[
"Fabbri",
"Alessandro",
""
],
[
"Good",
"Michael R. R.",
""
]
] | Black hole evaporation is studied using wave packets for the modes. These allow for approximate frequency and time resolution. The leading order late time behavior gives the well known Hawking radiation that is independent of how the black hole formed. The focus here is on the higher order terms and the rate at which t... |
1910.04437 | Xiao-Mei Kuang | Shi-Qian Hu, Bo Liu, Xiao-Mei Kuang, Rui-Hong Yue | Revisiting black hole thermodynamics in massive gravity: charged
particle absorption and shell of dust falling | 26 pages, 5 figures | Chinese Physics C Vol. 44, No. 10 (2020) 105107 | 10.1088/1674-1137/abab8a | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the variation of the massive black hole in both normal and extended
thermodynamic phase spaces via two methods. The first method includes a charged
particle absorbed by the black hole, while the second method includes a shell
of dust falling into the black hole. Using the former method, the first and
second ... | [
{
"created": "Thu, 10 Oct 2019 08:51:33 GMT",
"version": "v1"
}
] | 2020-10-02 | [
[
"Hu",
"Shi-Qian",
""
],
[
"Liu",
"Bo",
""
],
[
"Kuang",
"Xiao-Mei",
""
],
[
"Yue",
"Rui-Hong",
""
]
] | We study the variation of the massive black hole in both normal and extended thermodynamic phase spaces via two methods. The first method includes a charged particle absorbed by the black hole, while the second method includes a shell of dust falling into the black hole. Using the former method, the first and second la... |
1212.2155 | Ratbay Myrzakulov | Ratbay Myrzakulov | Cosmology of F(T) gravity and k-essence | 21 pages | Entropy, v.14, N9, 1627-1651 (2012) | 10.3390/e14091627 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This a brief review on $F(T)$ gravity and its relation with k-essence.
Modified teleparallel gravity theory with the torsion scalar has recently
gained a lot of attention as a possible explanation of dark energy. We perform
a thorough reconstruction analysis on the so-called $F(T)$ models, where $F(T)$
is some genera... | [
{
"created": "Sat, 24 Nov 2012 10:25:01 GMT",
"version": "v1"
}
] | 2012-12-11 | [
[
"Myrzakulov",
"Ratbay",
""
]
] | This a brief review on $F(T)$ gravity and its relation with k-essence. Modified teleparallel gravity theory with the torsion scalar has recently gained a lot of attention as a possible explanation of dark energy. We perform a thorough reconstruction analysis on the so-called $F(T)$ models, where $F(T)$ is some general ... |
gr-qc/0109040 | Don N. Page | Don N. Page | Black Holes with Less Entropy Than A/4 | 26 pages, LaTeX, no figures, accepted 2001 Sept. 25 for Phys. Rev. D.
Comments added on ineffective reflection of gravitational radiation | Phys.Rev. D65 (2002) 024017 | 10.1103/PhysRevD.65.024017 | Alberta-Thy-14-01 | gr-qc | null | One can increase one-quarter the area of a black hole, A/4, to exceed the
total thermodynamic entropy, S, by surrounding the hole with a perfectly
reflecting shell and adiabatically squeezing it inward. A/4 can be made to
exceed S by a factor of order unity before the shell enters the Planck regime,
though practical ... | [
{
"created": "Tue, 11 Sep 2001 18:12:43 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Sep 2001 20:38:23 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Page",
"Don N.",
""
]
] | One can increase one-quarter the area of a black hole, A/4, to exceed the total thermodynamic entropy, S, by surrounding the hole with a perfectly reflecting shell and adiabatically squeezing it inward. A/4 can be made to exceed S by a factor of order unity before the shell enters the Planck regime, though practical li... |
2305.07684 | Muhammad Sharif | M. Sharif and Sana Manzoor | Compact Objects admitting Finch-Skea Symmetry in $f(\mathcal{R},T^2)$
Gravity | 26 pages, 11 figures | Annals Phys. 454(2023)169337 | 10.1016/j.aop.2023.169337 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates the viability and stability of anisotropic compact
stars in the framework of $f(\mathcal{R},\mathrm{T}^{2})$ theory ($\mathcal{R}$
is the Ricci scalar and
$\mathrm{T}^{2}=\mathrm{T}_{\tau\upsilon}\mathrm{T}^{\tau\upsilon}$). In this
perspective, we use Finch-Skea symmetry and consider differen... | [
{
"created": "Fri, 12 May 2023 13:06:16 GMT",
"version": "v1"
}
] | 2023-05-31 | [
[
"Sharif",
"M.",
""
],
[
"Manzoor",
"Sana",
""
]
] | This paper investigates the viability and stability of anisotropic compact stars in the framework of $f(\mathcal{R},\mathrm{T}^{2})$ theory ($\mathcal{R}$ is the Ricci scalar and $\mathrm{T}^{2}=\mathrm{T}_{\tau\upsilon}\mathrm{T}^{\tau\upsilon}$). In this perspective, we use Finch-Skea symmetry and consider different ... |
1907.04946 | Benjamin J. Owen | Santiago Caride, Ra Inta, Benjamin J. Owen and Binod Rajbhandari
(Texas Tech University) | How to search for gravitational waves from $r$-modes of known pulsars | 10 pages, 2 figures | Phys. Rev. D 100, 064013 (2019) | 10.1103/PhysRevD.100.064013 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Searches for continuous gravitational waves from known pulsars so far have
been targeted at or near the spin frequency or double the spin frequency of
each pulsar, appropriate for mass quadrupole emission. But some neutron stars
might radiate strongly through current quadrupoles via $r$-modes, which
oscillate at abou... | [
{
"created": "Wed, 10 Jul 2019 22:35:06 GMT",
"version": "v1"
}
] | 2019-09-18 | [
[
"Caride",
"Santiago",
"",
"Texas Tech University"
],
[
"Inta",
"Ra",
"",
"Texas Tech University"
],
[
"Owen",
"Benjamin J.",
"",
"Texas Tech University"
],
[
"Rajbhandari",
"Binod",
"",
"Texas Tech University"
]
] | Searches for continuous gravitational waves from known pulsars so far have been targeted at or near the spin frequency or double the spin frequency of each pulsar, appropriate for mass quadrupole emission. But some neutron stars might radiate strongly through current quadrupoles via $r$-modes, which oscillate at about ... |
1709.02650 | Bibhas Majhi Ranjan | Krishnakanta Bhattacharya, Bibhas Ranjan Majhi, Saurav Samanta | Van der Waals criticality in AdS black holes: a phenomenological study | Refs. and comments added, to appear in Phys. Rev. D | Phys. Rev. D 96, 084037 (2017) | 10.1103/PhysRevD.96.084037 | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | AdS black holes exhibit van der Waals type phase transition. In the {\it
extended} phase-space formalism, the critical exponents for any spacetime
metric are identical to the standard ones. Motivated by this fact, we give a
general expression for the Helmholtz free energy near the critical point which
correctly repro... | [
{
"created": "Fri, 8 Sep 2017 11:14:19 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Sep 2017 12:52:38 GMT",
"version": "v2"
}
] | 2017-10-19 | [
[
"Bhattacharya",
"Krishnakanta",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
],
[
"Samanta",
"Saurav",
""
]
] | AdS black holes exhibit van der Waals type phase transition. In the {\it extended} phase-space formalism, the critical exponents for any spacetime metric are identical to the standard ones. Motivated by this fact, we give a general expression for the Helmholtz free energy near the critical point which correctly reprodu... |
1202.5699 | Salvatore Capozziello | S. Capozziello, M. De Laurentis, L. Fatibene, M. Francaviglia | The physical foundations for the geometric structure of relativistic
theories of gravitation. From General Relativity to Extended Theories of
Gravity through Ehlers-Pirani-Schild approach | 11 pages, 2 figures | International Journal of Geometric Methods in Modern Physics Vol.
9, No. 8 (2012) 1250072 (18 pages) | 10.1142/S0219887812500727 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss in a critical way the physical foundations of geometric structure
of relativistic theories of gravity by the so-called Ehlers-Pirani-Schild
formalism. This approach provides a natural interpretation of the observables
showing how relate them to General Relativity and to a large class of Extended
Theories o... | [
{
"created": "Sat, 25 Feb 2012 21:24:57 GMT",
"version": "v1"
}
] | 2012-07-26 | [
[
"Capozziello",
"S.",
""
],
[
"De Laurentis",
"M.",
""
],
[
"Fatibene",
"L.",
""
],
[
"Francaviglia",
"M.",
""
]
] | We discuss in a critical way the physical foundations of geometric structure of relativistic theories of gravity by the so-called Ehlers-Pirani-Schild formalism. This approach provides a natural interpretation of the observables showing how relate them to General Relativity and to a large class of Extended Theories of ... |
2005.11572 | Martin Bojowald | Garrett Wendel, Luis Martinez, Martin Bojowald | Physical implications of a fundamental period of time | 5 pages, 3 figures | Phys. Rev. Lett. 124 (2020) 241301 | 10.1103/PhysRevLett.124.241301 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If time is described by a fundamental process rather than a coordinate, it
interacts with any physical system that evolves in time. The resulting dynamics
is shown here to be consistent provided the fundamental period of the time
system is sufficiently small. A strong upper bound T_C < 10^{-33}s of the
fundamental pe... | [
{
"created": "Sat, 23 May 2020 17:13:03 GMT",
"version": "v1"
}
] | 2020-07-07 | [
[
"Wendel",
"Garrett",
""
],
[
"Martinez",
"Luis",
""
],
[
"Bojowald",
"Martin",
""
]
] | If time is described by a fundamental process rather than a coordinate, it interacts with any physical system that evolves in time. The resulting dynamics is shown here to be consistent provided the fundamental period of the time system is sufficiently small. A strong upper bound T_C < 10^{-33}s of the fundamental peri... |
1210.1146 | Luca Fabbri | Luca Fabbri | On a purely geometric approach to the Dirac matter field and its quantum
properties | 14 pages | Int.J.Theor.Phys.53, 1896-1909 (2014) | 10.1007/s10773-013-1992-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the most general axial torsion completion of gravity with
electrodynamics for $\frac{1}{2}$-spin spinors in an $8$-dimensional
representation of the Dirac matter field: this theory will allow to define
antimatter as matter with all quantum numbers reversed, where also the sign of
the mass beside that of t... | [
{
"created": "Wed, 3 Oct 2012 15:28:13 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Jan 2014 17:23:12 GMT",
"version": "v2"
},
{
"created": "Thu, 8 May 2014 10:53:31 GMT",
"version": "v3"
}
] | 2014-05-13 | [
[
"Fabbri",
"Luca",
""
]
] | We consider the most general axial torsion completion of gravity with electrodynamics for $\frac{1}{2}$-spin spinors in an $8$-dimensional representation of the Dirac matter field: this theory will allow to define antimatter as matter with all quantum numbers reversed, where also the sign of the mass beside that of the... |
1602.08512 | Sergiu I. Vacaru | Tamara Gheorghiu, Vyacheslav Ruchin, Olivia Vacaru, Sergiu I. Vacaru | Geometric Flows and Perelman's Thermodynamics for Black Ellipsoids in
$R^2$ and Einstein Gravity Theories | latex2e, 12pt, 46 pages; accepted: Annals Phys. NY | Annals of Physics NY 369 (2016) 1-35 | 10.1016/j.aop.2016.02.008 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study geometric relativistic flow and Ricci soliton equations which (for
respective nonholonomic constraints and self-similarity conditions) are
equivalent to the gravitational field equations of $R^2$ gravity and/or to the
Einstein equations with scalar field in general relativity, GR. Perelman's
functionals are ... | [
{
"created": "Fri, 19 Feb 2016 13:30:54 GMT",
"version": "v1"
}
] | 2016-03-25 | [
[
"Gheorghiu",
"Tamara",
""
],
[
"Ruchin",
"Vyacheslav",
""
],
[
"Vacaru",
"Olivia",
""
],
[
"Vacaru",
"Sergiu I.",
""
]
] | We study geometric relativistic flow and Ricci soliton equations which (for respective nonholonomic constraints and self-similarity conditions) are equivalent to the gravitational field equations of $R^2$ gravity and/or to the Einstein equations with scalar field in general relativity, GR. Perelman's functionals are ge... |
1305.2177 | Sebastian Szybka | Christa R. \"Olz, Sebastian J. Szybka | Conformal and projection diagrams in LaTeX | 18 pages, tutorial | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In general relativity, the causal structure of space-time may sometimes be
depicted by conformal Carter-Penrose diagrams or a recent extension of these -
the projection diagrams. The introduction of conformal diagrams in the sixties
was one of the progenitors of the golden age of relativity. They are the key
ingredie... | [
{
"created": "Thu, 9 May 2013 18:56:35 GMT",
"version": "v1"
}
] | 2013-05-10 | [
[
"Ölz",
"Christa R.",
""
],
[
"Szybka",
"Sebastian J.",
""
]
] | In general relativity, the causal structure of space-time may sometimes be depicted by conformal Carter-Penrose diagrams or a recent extension of these - the projection diagrams. The introduction of conformal diagrams in the sixties was one of the progenitors of the golden age of relativity. They are the key ingredient... |
2309.13594 | Gaetano Lambiase | G. Lambiase, L. Mastrototaro, Reggie C. Pantig, Ali Ovgun | Probing Schwarzschild-like Black Holes in Metric-Affine Bumblebee
Gravity with Accretion Disk, Deflection Angle, Greybody Bounds, and Neutrino
Propagation | 14 pages, 7 figures | JCAP 12 (2023) 026 | 10.1088/1475-7516/2023/12/026 | null | gr-qc astro-ph.GA astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | In this paper, we investigate Schwarzschild-like black holes within the
framework of metric-affine bumblebee gravity. We explore the implications of
such a gravitational setup on various astrophysical phenomena, including the
presence of an accretion disk, the deflection angle of light rays, the
establishment of grey... | [
{
"created": "Sun, 24 Sep 2023 09:38:27 GMT",
"version": "v1"
}
] | 2024-01-09 | [
[
"Lambiase",
"G.",
""
],
[
"Mastrototaro",
"L.",
""
],
[
"Pantig",
"Reggie C.",
""
],
[
"Ovgun",
"Ali",
""
]
] | In this paper, we investigate Schwarzschild-like black holes within the framework of metric-affine bumblebee gravity. We explore the implications of such a gravitational setup on various astrophysical phenomena, including the presence of an accretion disk, the deflection angle of light rays, the establishment of greybo... |
2305.11118 | Juliano Neves | R. R. Cuzinatto, C. A. M. de Melo, Juliano C. S. Neves | Shadows of black holes at cosmological distances in the co-varying
physical couplings framework | 10 pages, 2 figures. Published in Monthly Notices of the Royal
Astronomical Society | MNRAS 526 (3), 3987-3993 (2023) | 10.1093/mnras/stad2954 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The co-varying physical couplings (CPC) framework states that physical
parameters like the speed of light in vacuum $c$, the Newtonian constant $G$,
and the cosmological constant $\Lambda$ could indeed vary with the spacetime
coordinates $x^{\mu}$. Here, we assume a temporal variation, that is,
$c(t),G(t)$ and $\Lamb... | [
{
"created": "Thu, 18 May 2023 16:59:01 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2023 22:15:40 GMT",
"version": "v2"
}
] | 2023-10-18 | [
[
"Cuzinatto",
"R. R.",
""
],
[
"de Melo",
"C. A. M.",
""
],
[
"Neves",
"Juliano C. S.",
""
]
] | The co-varying physical couplings (CPC) framework states that physical parameters like the speed of light in vacuum $c$, the Newtonian constant $G$, and the cosmological constant $\Lambda$ could indeed vary with the spacetime coordinates $x^{\mu}$. Here, we assume a temporal variation, that is, $c(t),G(t)$ and $\Lambda... |
1910.00784 | Zhoujian Cao Dr | Xiaolin Liu and Zhoujian Cao and Lijing Shao | Validating the Effective-One-Body Numerical-Relativity Waveform Models
for Spin-aligned Binary Black Holes along Eccentric Orbits | 13 pages, 8 figures and 2 tables | Phys. Rev. D 101, 044049 (2020) | 10.1103/PhysRevD.101.044049 | null | gr-qc astro-ph.GA astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Effective-one-body (EOB) numerical-relativity (NR) waveform models for
spin-aligned binary black holes (BBHs), known as the SEOBNR waveform models,
are based on the EOB theoretical framework and NR simulations. SEOBNR models
have played an important role in the LIGO scientific collaboration (LSC)
gravitational wave (... | [
{
"created": "Wed, 2 Oct 2019 05:46:44 GMT",
"version": "v1"
}
] | 2020-03-04 | [
[
"Liu",
"Xiaolin",
""
],
[
"Cao",
"Zhoujian",
""
],
[
"Shao",
"Lijing",
""
]
] | Effective-one-body (EOB) numerical-relativity (NR) waveform models for spin-aligned binary black holes (BBHs), known as the SEOBNR waveform models, are based on the EOB theoretical framework and NR simulations. SEOBNR models have played an important role in the LIGO scientific collaboration (LSC) gravitational wave (GW... |
1611.07501 | Ali \"Ovg\"un Dr. | Ali \"Ovg\"un and Kimet Jusufi | Stable Dyonic Thin-Shell Wormholes in Low-Energy String Theory | 10 pages, 3 figures, will appear in Advances in High Energy Physics | Advances in High Energy Physics Volume 2017, 1215254 (2017) | 10.1155/2017/1215254 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considerable attention has been devoted to the wormhole physics in the past
30 years by exploring the possibilities of finding traversable wormholes
without the need of exotic matter. In particular the thin-shell wormhole
formalism has been widely investigated by exploiting the cut-and-paste
technique to merge two sp... | [
{
"created": "Tue, 22 Nov 2016 20:28:45 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jun 2017 15:15:53 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Oct 2017 16:53:10 GMT",
"version": "v3"
}
] | 2017-11-03 | [
[
"Övgün",
"Ali",
""
],
[
"Jusufi",
"Kimet",
""
]
] | Considerable attention has been devoted to the wormhole physics in the past 30 years by exploring the possibilities of finding traversable wormholes without the need of exotic matter. In particular the thin-shell wormhole formalism has been widely investigated by exploiting the cut-and-paste technique to merge two spac... |
0710.0022 | Lorenzo Iorio | Lorenzo Iorio | Astronomical constraints on some long-range models of modified gravity | Latex, 13 pages, no figures, 1 table. Other references added. Minor
stylistic changes. To appear in AHEP (Advances in High Energy Physics). Typo
corrected in eq. 6: thanks to G.E. Melki | Adv.High Energy Phys.2009:90731,2009 | 10.1155/2007/90731 | null | gr-qc astro-ph hep-ph physics.space-ph | null | In this paper we use the corrections to the usual Newton-Einstein secular
precessions of the perihelia of the inner planets of the Solar System,
phenomenologically estimated as solve-for parameters by the Russian astronomer
E.V. Pitjeva by fitting almost one century of data with the EPM2004
ephemerides, in order to c... | [
{
"created": "Fri, 28 Sep 2007 22:26:27 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Oct 2007 12:41:30 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Oct 2007 13:26:52 GMT",
"version": "v3"
},
{
"created": "Sat, 6 Oct 2007 15:32:26 GMT",
"version": "v4"
},
{
"crea... | 2009-12-17 | [
[
"Iorio",
"Lorenzo",
""
]
] | In this paper we use the corrections to the usual Newton-Einstein secular precessions of the perihelia of the inner planets of the Solar System, phenomenologically estimated as solve-for parameters by the Russian astronomer E.V. Pitjeva by fitting almost one century of data with the EPM2004 ephemerides, in order to con... |
1502.02593 | Pedro Moraes | Pedro H.R.S. Moraes | Cosmological solutions from Induced Matter Model applied to 5D f(R,T)
gravity and the shrinking of the extra coordinate | 8 pages, 4 figures. Accepted for publication in European Physical
Journal C | null | 10.1140/epjc/s10052-015-3393-x | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, I present exact cosmological solutions from Wesson's Induced
Matter Model application to a general 5D metric in f(R,T) theory of gravity.
The non-conservation of the energy-momentum tensor, predicted by f(R,T) theory,
allows the derivation of a relation that describes the time evolution of the
extra coo... | [
{
"created": "Mon, 9 Feb 2015 18:27:30 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Apr 2015 19:15:19 GMT",
"version": "v2"
}
] | 2015-04-23 | [
[
"Moraes",
"Pedro H. R. S.",
""
]
] | In this work, I present exact cosmological solutions from Wesson's Induced Matter Model application to a general 5D metric in f(R,T) theory of gravity. The non-conservation of the energy-momentum tensor, predicted by f(R,T) theory, allows the derivation of a relation that describes the time evolution of the extra coord... |
2111.09163 | Atsuhisa Ota | Atsuhisa Ota, Hayley J. Macpherson, William R. Coulton | Covariant transverse-traceless projection for secondary gravitational
waves | 14 pages, 2 figure, major revision | null | 10.1103/PhysRevD.106.063521 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Second-order tensor modes induced by nonlinear gravity are a key component of
the cosmological background of gravitational waves. A detection of this
background would allow us to probe the primordial power spectrum at otherwise
inaccessible scales. Usually, the energy density of these gravitational waves
is studied w... | [
{
"created": "Wed, 17 Nov 2021 14:54:12 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jul 2022 11:43:32 GMT",
"version": "v2"
}
] | 2022-10-05 | [
[
"Ota",
"Atsuhisa",
""
],
[
"Macpherson",
"Hayley J.",
""
],
[
"Coulton",
"William R.",
""
]
] | Second-order tensor modes induced by nonlinear gravity are a key component of the cosmological background of gravitational waves. A detection of this background would allow us to probe the primordial power spectrum at otherwise inaccessible scales. Usually, the energy density of these gravitational waves is studied wit... |
1312.4357 | Olivier Minazzoli | Olivier Minazzoli | On the cosmic convergence mechanism of the massless dilaton | 4 pages -- accepted for publication in Physics Letters B | Physics Letters B, Volume 735, 30 July 2014 | 10.1016/j.physletb.2014.06.027 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The converging mechanism discussed in [Damour & Nordtvedt, Physical Review
Letters,70,15] for scalar-tensor theories has been applied to dilaton-like
theories in several subsequent papers. In the present communication, we show
that an unfortunate assumption in those studies led to a scalar-field equation
unsuitable f... | [
{
"created": "Mon, 16 Dec 2013 13:43:02 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Jun 2014 09:49:38 GMT",
"version": "v2"
}
] | 2014-06-24 | [
[
"Minazzoli",
"Olivier",
""
]
] | The converging mechanism discussed in [Damour & Nordtvedt, Physical Review Letters,70,15] for scalar-tensor theories has been applied to dilaton-like theories in several subsequent papers. In the present communication, we show that an unfortunate assumption in those studies led to a scalar-field equation unsuitable for... |
gr-qc/9507015 | null | Giampiero Esposito and Giuseppe Pollifrone | Twistors in Conformally Flat Einstein Four-Manifolds | 22 pages, plain-tex | Int.J.Mod.Phys. D5 (1996) 481-494 | 10.1142/S0218271896000291 | DSF 95/24 | gr-qc | null | This paper studies the two-component spinor form of massive spin-3/2
potentials in conformally flat Einstein four-manifolds. Following earlier work
in the literature, a non-vanishing cosmological constant makes it necessary to
introduce a supercovariant derivative operator. The analysis of supergauge
transformations ... | [
{
"created": "Thu, 6 Jul 1995 15:48:39 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Esposito",
"Giampiero",
""
],
[
"Pollifrone",
"Giuseppe",
""
]
] | This paper studies the two-component spinor form of massive spin-3/2 potentials in conformally flat Einstein four-manifolds. Following earlier work in the literature, a non-vanishing cosmological constant makes it necessary to introduce a supercovariant derivative operator. The analysis of supergauge transformations of... |
gr-qc/0608098 | Marek Szydlowski | Marek Szydlowski, Aleksandra Kurek | Towards classification of simple dark energy cosmological models | 10 pages, 2 figures, the paper presented at 42nd Karpacz Winter
School of Theoretical Physics: Ladek, Poland, 6-11 Feb 2006 | ECONFC0602061:18,2006; Int.J.Geom.Meth.Mod.Phys.4:313,2007 | 10.1142/S0219887807002016 | null | gr-qc | null | We characterize a class of simple FRW models filled by both dark energy and
dark matter in notion of a single potential function of the scale factor
$a(t)$; $t$ is the cosmological time. It is representing potential of
fictitious particle - Universe moving in 1-dimensional well $V(a)$ which the
positional variable mi... | [
{
"created": "Sun, 20 Aug 2006 19:57:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Szydlowski",
"Marek",
""
],
[
"Kurek",
"Aleksandra",
""
]
] | We characterize a class of simple FRW models filled by both dark energy and dark matter in notion of a single potential function of the scale factor $a(t)$; $t$ is the cosmological time. It is representing potential of fictitious particle - Universe moving in 1-dimensional well $V(a)$ which the positional variable mimi... |
1607.08052 | Mohammad Ali Gorji | Mohammad Ali Gorji | Late time cosmic acceleration from natural infrared cutoff? | 11 pages, 2 figures, accepted for publication in PLB | Phys. Lett. B 760 (2016) 769 | 10.1016/j.physletb.2016.07.064 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, inspired by the ultraviolet deformation of the
Friedmann-Lema\^{\i}tre-Robertson-Walker geometry in loop quantum cosmology, we
formulate an infrared-modified cosmological model. We obtain the associated
deformed Friedmann and Raychaudhuri equations and we show that the late time
cosmic acceleration can... | [
{
"created": "Wed, 27 Jul 2016 11:52:41 GMT",
"version": "v1"
}
] | 2016-08-12 | [
[
"Gorji",
"Mohammad Ali",
""
]
] | In this paper, inspired by the ultraviolet deformation of the Friedmann-Lema\^{\i}tre-Robertson-Walker geometry in loop quantum cosmology, we formulate an infrared-modified cosmological model. We obtain the associated deformed Friedmann and Raychaudhuri equations and we show that the late time cosmic acceleration can b... |
gr-qc/0701004 | Dmitri Gal'tsov | Dmitri Gal'tsov, Pavel Spirin and Simona Staub | Radiation reaction in curved space-time: local method | 10 pages, ws-procs9x6, published in "Gravitation and Astrophysics",
Proceedings of the VII Asia-Pacific International Conference National Central
University, Taiwan 23 - 26 November 2005, ed. J.M. Nester, C.-M. Chen, J.-P.
Hsu. World Scientific, 2006, pp. 345-354 | null | 10.1142/9789812772923_0041 | null | gr-qc | null | Although consensus seems to exist about the validity of equations accounting
for radiation reaction in curved space-time, their previous derivations were
criticized recently as not fully satisfactory: some ambiguities were noticed in
the procedure of integration of the field momentum over the tube surrounding
the wor... | [
{
"created": "Sat, 30 Dec 2006 12:03:02 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Gal'tsov",
"Dmitri",
""
],
[
"Spirin",
"Pavel",
""
],
[
"Staub",
"Simona",
""
]
] | Although consensus seems to exist about the validity of equations accounting for radiation reaction in curved space-time, their previous derivations were criticized recently as not fully satisfactory: some ambiguities were noticed in the procedure of integration of the field momentum over the tube surrounding the world... |
1912.01304 | Xavier Ja\'en | Xavier Ja\'en and Pere Talavera | New design of gravitational wave detectors | pdfLaTeX, 24 pages, 7 figures | 2021 Classical and Quantum Gravity, Volume 38, Number 9 | 10.1088/1361-6382/abf1c2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a novel approach to detect gravitational waves based on a
semi-rigid detector. The approach relies upon the time delay that the light
takes to travel from a fixed mirror at the end of a rigid bar to a nearby free
mirror. We show that the dimensions of the experimental device can be shortened
in comparison ... | [
{
"created": "Tue, 3 Dec 2019 11:21:26 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Dec 2020 15:56:46 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Mar 2021 18:20:25 GMT",
"version": "v3"
},
{
"created": "Thu, 22 Apr 2021 07:30:12 GMT",
"version": "v4"
}
] | 2021-04-23 | [
[
"Jaén",
"Xavier",
""
],
[
"Talavera",
"Pere",
""
]
] | We propose a novel approach to detect gravitational waves based on a semi-rigid detector. The approach relies upon the time delay that the light takes to travel from a fixed mirror at the end of a rigid bar to a nearby free mirror. We show that the dimensions of the experimental device can be shortened in comparison to... |
1611.09016 | Li Xiang | Xiang Li, Yi Ling, You-Gen Shen, Cheng-Zhou Liu, Hong-Sheng He,
Lan-Fang Xu | Generalized uncertainty principles, effective Newton constant and
regular black holes | 22 pages | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we explore the quantum spacetimes that are potentially
connected with the generalized uncertainty principles. By analyzing the
gravity-induced quantum interference pattern and the Gedanken for weighting
photon, we find that the generalized uncertainty principles inspire the
effective Newton constant as... | [
{
"created": "Mon, 28 Nov 2016 08:14:14 GMT",
"version": "v1"
}
] | 2016-11-29 | [
[
"Li",
"Xiang",
""
],
[
"Ling",
"Yi",
""
],
[
"Shen",
"You-Gen",
""
],
[
"Liu",
"Cheng-Zhou",
""
],
[
"He",
"Hong-Sheng",
""
],
[
"Xu",
"Lan-Fang",
""
]
] | In this paper, we explore the quantum spacetimes that are potentially connected with the generalized uncertainty principles. By analyzing the gravity-induced quantum interference pattern and the Gedanken for weighting photon, we find that the generalized uncertainty principles inspire the effective Newton constant as s... |
1506.08579 | Francesco Cianfrani dr | Jakub Bilski, Emanuele Alesci, Francesco Cianfrani | Quantum reduced loop gravity: extension to scalar field | 14 pages, typos corrected | Phys. Rev. D 92, 124029 (2015) | 10.1103/PhysRevD.92.124029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantization of the Hamiltonian for a scalar field is performed in the
framework of Quantum Reduced Loop Gravity. We outline how the regularization
can be performed by using the analogous tools adopted in full Loop Quantum
Gravity and the matrix elements of the resulting operator between basis states
are analytic... | [
{
"created": "Mon, 29 Jun 2015 11:03:15 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jul 2015 16:10:57 GMT",
"version": "v2"
}
] | 2015-12-23 | [
[
"Bilski",
"Jakub",
""
],
[
"Alesci",
"Emanuele",
""
],
[
"Cianfrani",
"Francesco",
""
]
] | The quantization of the Hamiltonian for a scalar field is performed in the framework of Quantum Reduced Loop Gravity. We outline how the regularization can be performed by using the analogous tools adopted in full Loop Quantum Gravity and the matrix elements of the resulting operator between basis states are analytic c... |
2006.12604 | Francesco Salemi | M. Drago, V.Gayathri, S. Klimenko, C. Lazzaro, E. Milotti, G.
Mitselmakher, V. Necula, B. O'Brian, G. A. Prodi, F. Salemi, M. Szczepanczyk,
S. Tiwari, V. Tiwari, G. Vedovato and I. Yakushin | Coherent WaveBurst, a pipeline for unmodeled gravitational-wave data
analysis | 15 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | coherent WaveBurst (cWB) is a highly configurable pipeline designed to detect
a broad range of gravitational-wave (GW) transients in the data of the
worldwide network of GW detectors. The algorithmic core of cWB is a
time-frequency analysis with the Wilson-Daubechies-Meyer wavelets aimed at the
identification of GW e... | [
{
"created": "Mon, 22 Jun 2020 20:42:50 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 2021 14:46:33 GMT",
"version": "v2"
}
] | 2021-01-14 | [
[
"Drago",
"M.",
""
],
[
"Gayathri",
"V.",
""
],
[
"Klimenko",
"S.",
""
],
[
"Lazzaro",
"C.",
""
],
[
"Milotti",
"E.",
""
],
[
"Mitselmakher",
"G.",
""
],
[
"Necula",
"V.",
""
],
[
"O'Brian",
"B."... | coherent WaveBurst (cWB) is a highly configurable pipeline designed to detect a broad range of gravitational-wave (GW) transients in the data of the worldwide network of GW detectors. The algorithmic core of cWB is a time-frequency analysis with the Wilson-Daubechies-Meyer wavelets aimed at the identification of GW eve... |
1811.12494 | Che-Yu Chen | Che-Yu Chen, Mariam Bouhmadi-L\'opez, Pisin Chen | Probing Palatini-type gravity theories through gravitational wave
detections via quasinormal modes | 18 pages, 5 figures | Eur. Phys. J. C (2019) 79:63 | 10.1140/epjc/s10052-019-6585-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility of testing gravity theories with the help of gravitational
wave detections has become an interesting arena of recent research. In this
paper, we follow this direction by investigating the quasinormal modes (QNMs)
of the axial perturbations for charged black holes in the Palatini-type
theories of gravi... | [
{
"created": "Thu, 29 Nov 2018 21:28:15 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jan 2019 07:10:48 GMT",
"version": "v2"
}
] | 2019-01-30 | [
[
"Chen",
"Che-Yu",
""
],
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Chen",
"Pisin",
""
]
] | The possibility of testing gravity theories with the help of gravitational wave detections has become an interesting arena of recent research. In this paper, we follow this direction by investigating the quasinormal modes (QNMs) of the axial perturbations for charged black holes in the Palatini-type theories of gravity... |
2107.13547 | Marzieh Faraji | Marzieh Faraji, Narges Rashidi, Kourosh Nozari | Inflation in Energy-Momentum Squared Gravity in Light of Planck2018 | 16 Pages, 9 Figures | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We study cosmological dynamics of the energy-momentum squared gravity. By
adding the squared of the matter field's energy-momentum tensor ($\zeta\,
\textbf{T}^{2}$) to the Einstein Hilbert action, we obtain the Einstein's field
equations and study the conservation law. We show that the presence of $\zeta\,
\textbf{T}... | [
{
"created": "Thu, 29 Jul 2021 07:31:13 GMT",
"version": "v1"
}
] | 2021-07-30 | [
[
"Faraji",
"Marzieh",
""
],
[
"Rashidi",
"Narges",
""
],
[
"Nozari",
"Kourosh",
""
]
] | We study cosmological dynamics of the energy-momentum squared gravity. By adding the squared of the matter field's energy-momentum tensor ($\zeta\, \textbf{T}^{2}$) to the Einstein Hilbert action, we obtain the Einstein's field equations and study the conservation law. We show that the presence of $\zeta\, \textbf{T}^{... |
gr-qc/0207084 | Etera R. Livine | Etera R Livine | Projected Spin Networks for Lorentz connection: Linking Spin Foams and
Loop Gravity | Latex, 15 pages | Class.Quant.Grav. 19 (2002) 5525-5542 | 10.1088/0264-9381/19/21/316 | null | gr-qc | null | In the search for a covariant formulation for Loop Quantum Gravity, spin
foams have arised as the corresponding discrete space-time structure and, among
the different models, the Barrett-Crane model seems the most promising. Here,
we study its boundary states and introduce cylindrical functions on both the
Lorentz co... | [
{
"created": "Mon, 22 Jul 2002 09:58:53 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Livine",
"Etera R",
""
]
] | In the search for a covariant formulation for Loop Quantum Gravity, spin foams have arised as the corresponding discrete space-time structure and, among the different models, the Barrett-Crane model seems the most promising. Here, we study its boundary states and introduce cylindrical functions on both the Lorentz conn... |
gr-qc/9811017 | Garcia | L.C.Garcia de Andrade | Distributional torsion of charged domain walls with spin | 8 pages,Latex | null | null | null | gr-qc | null | An exact solution of Einstein-Cartan-Maxwell (ECM) field equations
representing a charged domain wall given by the jump on the electric charge and
spin density across the wall is obtained from the Riemannian theory of
distributions. The Gauss-Coddazzi equations are used to show that spin, charge
and Cartan torsion in... | [
{
"created": "Thu, 5 Nov 1998 12:01:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Andrade",
"L. C. Garcia",
""
]
] | An exact solution of Einstein-Cartan-Maxwell (ECM) field equations representing a charged domain wall given by the jump on the electric charge and spin density across the wall is obtained from the Riemannian theory of distributions. The Gauss-Coddazzi equations are used to show that spin, charge and Cartan torsion incr... |
0804.0973 | Kirill Bronnikov | K.A. Bronnikov, S.A. Kononogov, V.N. Melnikov, S.G. Rubin | Cosmologies from nonlinear multidimensional gravity with acceleration
and slowly varying G | 5 pages, to be published in Grav. Cosmol | Grav.Cosmol.14:230-234,2008 | 10.1134/S0202289308030043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider multidimensional gravity with a Lagrangian containing the Ricci
tensor squared and the Kretschmann invariant. In a Kaluza-Klein approach with a
single compact extra space of arbitrary dimension, with the aid of a
slow-change approximation (as compared with the Planck scale), we build a class
of spatially ... | [
{
"created": "Mon, 7 Apr 2008 07:04:39 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Kononogov",
"S. A.",
""
],
[
"Melnikov",
"V. N.",
""
],
[
"Rubin",
"S. G.",
""
]
] | We consider multidimensional gravity with a Lagrangian containing the Ricci tensor squared and the Kretschmann invariant. In a Kaluza-Klein approach with a single compact extra space of arbitrary dimension, with the aid of a slow-change approximation (as compared with the Planck scale), we build a class of spatially fl... |
gr-qc/9504033 | Steve Carlip | Steven Carlip | A Phase Space Path Integral for (2+1)-Dimensional Gravity | 9 pages, LaTeX, no figures. (Minor changes, in particular to clarify
exceptional features of torus topology; final version to appear in Class.
Quant. Grav.) | Class.Quant.Grav.12:2201-2208,1995 | 10.1088/0264-9381/12/9/007 | UCD-95-10 | gr-qc hep-th | null | I investigate the relationship between the phase space path integral in
(2+1)-dimensional gravity and the canonical quantization of the corresponding
reduced phase space in the York time slicing. I demonstrate the equivalence of
these two approaches, and discuss some subtleties in the definition of the path
integral ... | [
{
"created": "Fri, 21 Apr 1995 00:28:59 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jul 1995 19:06:30 GMT",
"version": "v2"
}
] | 2010-04-28 | [
[
"Carlip",
"Steven",
""
]
] | I investigate the relationship between the phase space path integral in (2+1)-dimensional gravity and the canonical quantization of the corresponding reduced phase space in the York time slicing. I demonstrate the equivalence of these two approaches, and discuss some subtleties in the definition of the path integral ne... |
gr-qc/9704003 | Gentil O. Pires | Carlos Pinheiro, Gentil O. Pires and Claudio Sasaki | On a Three-Dimensional Gravity Model with Higher Derivatives | 9 pages, Latex, no figures; to be published in Gen. Rel. Grav | Gen.Rel.Grav. 29 (1997) 409-416 | 10.1023/A:1018849730067 | null | gr-qc hep-th | null | The purpose of this work is to present a model for 3D massive gravity with
topological and higher-derivative terms. Causality and unitarity are discussed
at tree-level. Power-counting renormalizability is also contemplated.
| [
{
"created": "Tue, 1 Apr 1997 17:58:36 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Pinheiro",
"Carlos",
""
],
[
"Pires",
"Gentil O.",
""
],
[
"Sasaki",
"Claudio",
""
]
] | The purpose of this work is to present a model for 3D massive gravity with topological and higher-derivative terms. Causality and unitarity are discussed at tree-level. Power-counting renormalizability is also contemplated. |
gr-qc/0307078 | M. Blagojevic | M. Blagojevic and M. Vasilic | 3D gravity with torsion as a Chern-Simons gauge theory | 12 pages, RevTeX | Phys.Rev. D68 (2003) 104023 | 10.1103/PhysRevD.68.104023 | null | gr-qc hep-th | null | We show that topological 3D gravity with torsion can be formulated as a
Chern-Simons gauge theory, provided a specific parameter, known as the
effective cosmological constant, is negative. In that case, the boundary
dynamics of the theory corresponding to anti-de Sitter boundary conditions is
described by a conformal... | [
{
"created": "Wed, 16 Jul 2003 10:49:59 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Blagojevic",
"M.",
""
],
[
"Vasilic",
"M.",
""
]
] | We show that topological 3D gravity with torsion can be formulated as a Chern-Simons gauge theory, provided a specific parameter, known as the effective cosmological constant, is negative. In that case, the boundary dynamics of the theory corresponding to anti-de Sitter boundary conditions is described by a conformal f... |
1908.07089 | Sizheng Ma | Sizheng Ma and Nicolas Yunes | Improved Constraints on Modified Gravity with Eccentric Gravitational
Waves | 23 pages, 9 figures | Phys. Rev. D 100, 124032 (2019) | 10.1103/PhysRevD.100.124032 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent gravitational wave observations have allowed stringent new constraints
on modifications to General Relativity (GR) in the extreme gravity regime.
Although these observations were consistent with compact binaries with no
orbital eccentricity, gravitational waves emitted in mildly eccentric binaries
may be obser... | [
{
"created": "Mon, 19 Aug 2019 22:37:13 GMT",
"version": "v1"
}
] | 2019-12-12 | [
[
"Ma",
"Sizheng",
""
],
[
"Yunes",
"Nicolas",
""
]
] | Recent gravitational wave observations have allowed stringent new constraints on modifications to General Relativity (GR) in the extreme gravity regime. Although these observations were consistent with compact binaries with no orbital eccentricity, gravitational waves emitted in mildly eccentric binaries may be observe... |
2110.00766 | N V Krishnendu | N V Krishnendu and Frank Ohme | Interplay of spin-precession and higher harmonics in the parameter
estimation of binary black holes | 12 pages, 8 figures Data release URL:
https://zenodo.org/record/6337692#.YieS5BDMKLp | Phys. Rev. D 105, 064012, Published 7 March 2022 | 10.1103/PhysRevD.105.064012 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational-wave (GW) signals from coalescing compact binaries carry
enormous information about the source dynamics and are an excellent tool to
probe unknown astrophysics and fundamental physics. Though the updated catalog
of compact binary signals reports evidence for slowly spinning systems and
unequal mass bina... | [
{
"created": "Sat, 2 Oct 2021 09:47:38 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2022 09:45:55 GMT",
"version": "v2"
}
] | 2022-03-10 | [
[
"Krishnendu",
"N V",
""
],
[
"Ohme",
"Frank",
""
]
] | Gravitational-wave (GW) signals from coalescing compact binaries carry enormous information about the source dynamics and are an excellent tool to probe unknown astrophysics and fundamental physics. Though the updated catalog of compact binary signals reports evidence for slowly spinning systems and unequal mass binari... |
1305.3509 | Johan Noldus | Johan Noldus | Interpretation of quantal manifolds | 16 pages. arXiv admin note: substantial text overlap with
arXiv:1101.5113 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In quantum gravity, one looks for alternative structures to spacetime physics
than ordinary real manifolds. Here, we propose an alternative universal
construction containing the latter as an equilibrium state under the action of
the universal diffeomorphism group. Our theory contains many other previous
proposals in ... | [
{
"created": "Sat, 11 May 2013 17:28:23 GMT",
"version": "v1"
}
] | 2013-05-16 | [
[
"Noldus",
"Johan",
""
]
] | In quantum gravity, one looks for alternative structures to spacetime physics than ordinary real manifolds. Here, we propose an alternative universal construction containing the latter as an equilibrium state under the action of the universal diffeomorphism group. Our theory contains many other previous proposals in th... |
gr-qc/0408037 | Jonathan Eakins | J. S. Eakins | Classical and Quantum Causality in Quantum Field Theory. Or, "The
Quantum Universe" | 398 pages, 9 figures. Thesis submitted to the University of
Nottingham for the degree of Doctor of Philosophy, April 2004 | null | null | null | gr-qc quant-ph | null | Based on a number of experimentally verified physical observations, it is
argued that the standard principles of quantum mechanics should be applied to
the Universe as a whole. Thus, a paradigm is proposed in which the entire
Universe is represented by a pure state wavefunction contained in a
factorisable Hilbert spa... | [
{
"created": "Thu, 12 Aug 2004 16:23:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Eakins",
"J. S.",
""
]
] | Based on a number of experimentally verified physical observations, it is argued that the standard principles of quantum mechanics should be applied to the Universe as a whole. Thus, a paradigm is proposed in which the entire Universe is represented by a pure state wavefunction contained in a factorisable Hilbert space... |
0907.2749 | Hao Wei | Hao Wei | Varying Alpha Driven by the Dirac-Born-Infeld Scalar Field | 12 pages, 1 table, 8 figures, revtex4; v2: discussions added, Phys.
Lett. B in press; v3: published version | Phys.Lett.B682:98-104,2009 | 10.1016/j.physletb.2009.10.086 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since about ten years ago, varying $\alpha$ theories attracted many
attentions, mainly due to the first observational evidence from the quasar
absorption spectra that the fine structure ``constant'' might change with
cosmological time. In this work, we investigate the cosmic evolution of
$\alpha$ driven by the Dirac-... | [
{
"created": "Thu, 16 Jul 2009 12:30:00 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Oct 2009 04:45:00 GMT",
"version": "v2"
},
{
"created": "Sun, 15 Nov 2009 09:00:00 GMT",
"version": "v3"
}
] | 2009-11-15 | [
[
"Wei",
"Hao",
""
]
] | Since about ten years ago, varying $\alpha$ theories attracted many attentions, mainly due to the first observational evidence from the quasar absorption spectra that the fine structure ``constant'' might change with cosmological time. In this work, we investigate the cosmic evolution of $\alpha$ driven by the Dirac-Bo... |
2401.05514 | Andrea Russo | Jonathan Oppenheim, Andrea Russo, Zachary Weller-Davies | Diffeomorphism invariant classical-quantum path integrals for Nordstrom
gravity | null | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When classical degrees of freedom and quantum degrees of freedom are
consistently coupled, the former diffuse, while the latter undergo decoherence.
Here, we construct a theory of quantum matter fields and Nordstrom gravity in
which the space-time metric is treated classically. The dynamics is constructed
via the cla... | [
{
"created": "Wed, 10 Jan 2024 19:23:00 GMT",
"version": "v1"
}
] | 2024-01-12 | [
[
"Oppenheim",
"Jonathan",
""
],
[
"Russo",
"Andrea",
""
],
[
"Weller-Davies",
"Zachary",
""
]
] | When classical degrees of freedom and quantum degrees of freedom are consistently coupled, the former diffuse, while the latter undergo decoherence. Here, we construct a theory of quantum matter fields and Nordstrom gravity in which the space-time metric is treated classically. The dynamics is constructed via the class... |
gr-qc/9511055 | Luis Anchordoqui | Luis A. Anchordoqui, Diego F. Torres, H\'ector Vucetich | Primordial Nucleosynthesis as a test of variable rest masses
5-dimensional cosmology | Corrected version with referee's remarks. Unchanged global results.
Some references added; to be published in Phys. Lett. A. | Phys.Lett. A222 (1996) 43-46 | 10.1016/0375-9601(96)00621-4 | null | gr-qc | null | The deviation of primordial Helium production due to a variation on the
difference between the rest masses of the nucleons is presented. It is found an
upper bound $\delta (M_{_n} - M_{_p}) \alt 0.129$ MeV, between the present and
nucleosynthesis epochs. This bound is used to analyze Wesson's theory of
gravitation; a... | [
{
"created": "Mon, 20 Nov 1995 19:04:56 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 1996 20:57:04 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Torres",
"Diego F.",
""
],
[
"Vucetich",
"Héctor",
""
]
] | The deviation of primordial Helium production due to a variation on the difference between the rest masses of the nucleons is presented. It is found an upper bound $\delta (M_{_n} - M_{_p}) \alt 0.129$ MeV, between the present and nucleosynthesis epochs. This bound is used to analyze Wesson's theory of gravitation; as ... |
2303.17666 | S\'ergio Vinicius Monteiro Castelo Branco Xavier | S\'ergio V. M. C. B. Xavier, Haroldo C. D. Lima Junior, Lu\'is C. B.
Crispino | Shadows of black holes with dark matter halo | 8 pages, 6 figures | Phys. Rev. D 107, 064040 (2023) | 10.1103/PhysRevD.107.064040 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the shadow of an exact black hole solution of Einstein's
equations recently proposed by Cardoso et al., to describe a supermassive black
hole immersed in a dark matter halo. We analyze and discuss the light rings and
the gravitational lensing of this spacetime comparing them with an isolated
Schwarzsch... | [
{
"created": "Thu, 30 Mar 2023 19:06:05 GMT",
"version": "v1"
}
] | 2023-04-03 | [
[
"Xavier",
"Sérgio V. M. C. B.",
""
],
[
"Junior",
"Haroldo C. D. Lima",
""
],
[
"Crispino",
"Luís C. B.",
""
]
] | We investigate the shadow of an exact black hole solution of Einstein's equations recently proposed by Cardoso et al., to describe a supermassive black hole immersed in a dark matter halo. We analyze and discuss the light rings and the gravitational lensing of this spacetime comparing them with an isolated Schwarzschil... |
1003.1609 | Stoytcho Yazadjiev | Ivan Zh. Stefanov, Stoytcho S. Yazadjiev, Galin G. Gyulchev | Connection between black-hole quasinormal modes and lensing in the
strong deflection limit | 7 pages, v2 minor changes, references added, v3 title changed,
comments and references added, typos corrected | Phys.Rev.Lett.104:251103,2010 | 10.1103/PhysRevLett.104.251103 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of the current Letter is to give some relations between
gravitational lensing in the strong-deflection limit and the frequencies of the
quasinormal modes of spherically symmetric, asymptotically flat black holes. On
the one side, the obtained relations can give a physical interpretation of the
strong-defl... | [
{
"created": "Mon, 8 Mar 2010 12:00:39 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Mar 2010 14:37:19 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Sep 2010 11:32:51 GMT",
"version": "v3"
}
] | 2010-09-24 | [
[
"Stefanov",
"Ivan Zh.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
],
[
"Gyulchev",
"Galin G.",
""
]
] | The purpose of the current Letter is to give some relations between gravitational lensing in the strong-deflection limit and the frequencies of the quasinormal modes of spherically symmetric, asymptotically flat black holes. On the one side, the obtained relations can give a physical interpretation of the strong-deflec... |
gr-qc/0309042 | Wung-Hong Huang | Wung-Hong Huang and I-Chin Wang | Quantum Perfect-Fluid Kaluza-Klein Cosmology | Latex 18 pages, add section 2 to introduce the quantization of
perfect fluid | Int.J.Mod.Phys. A21 (2006) 4463-4478 | 10.1142/S0217751X06031442 | null | gr-qc hep-th | null | The perfect fluid cosmology in the 1+d+D dimensional Kaluza-Klein spacetimes
for an arbitrary barotropic equation of state $p= n \rho$ is quantized by using
the Schutz's variational formalism. We make efforts in the mathematics to solve
the problems in two cases. For the first case of the stiff fluid $n=1$ we
exactly... | [
{
"created": "Mon, 8 Sep 2003 06:07:35 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Sep 2007 09:07:06 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Huang",
"Wung-Hong",
""
],
[
"Wang",
"I-Chin",
""
]
] | The perfect fluid cosmology in the 1+d+D dimensional Kaluza-Klein spacetimes for an arbitrary barotropic equation of state $p= n \rho$ is quantized by using the Schutz's variational formalism. We make efforts in the mathematics to solve the problems in two cases. For the first case of the stiff fluid $n=1$ we exactly s... |
2103.12845 | Jean-Pierre Petit | J.P.Petit and G.D'Agostini | Cancellation of the central singularity of the Schwarzschild solution
with natural mass inversion process | 11 pages , 12 figures | Modern Physics Letters A, Vol. 30, No. 9 (2015) 1550051 | 10.1142/S0217732315500510 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider the classical Schwarzschild solution in the context of a Janus
cosmological model. We show that the central singularity can be eliminated
through a simple coordinate change and that the subsequent transit from one
fold to the other is accompanied by mass inversion. In such scenario matter
swallowed by b... | [
{
"created": "Tue, 23 Mar 2021 21:12:50 GMT",
"version": "v1"
}
] | 2021-11-22 | [
[
"Petit",
"J. P.",
""
],
[
"D'Agostini",
"G.",
""
]
] | We reconsider the classical Schwarzschild solution in the context of a Janus cosmological model. We show that the central singularity can be eliminated through a simple coordinate change and that the subsequent transit from one fold to the other is accompanied by mass inversion. In such scenario matter swallowed by bla... |
gr-qc/9811004 | Carsten Gundlach | D. Garfinkle, C. Gundlach, and J. M. Martin-Garcia | Angular momentum near the black hole threshold in scalar field collapse | 7 pages, RevTex | Phys.Rev.D59:104012,1999 | 10.1103/PhysRevD.59.104012 | null | gr-qc | null | For the formation of a black hole in the gravitational collapse of a massless
scalar field, we calculate a critical exponent that governs the black hole
angular momentum for slightly non-spherical initial data near the black hole
threshold. We calculate the scaling law by second-order perturbation theory. We
then use... | [
{
"created": "Mon, 2 Nov 1998 23:32:18 GMT",
"version": "v1"
}
] | 2011-04-20 | [
[
"Garfinkle",
"D.",
""
],
[
"Gundlach",
"C.",
""
],
[
"Martin-Garcia",
"J. M.",
""
]
] | For the formation of a black hole in the gravitational collapse of a massless scalar field, we calculate a critical exponent that governs the black hole angular momentum for slightly non-spherical initial data near the black hole threshold. We calculate the scaling law by second-order perturbation theory. We then use t... |
1503.00033 | Nilza Pires Prof | M. R. G. Maia, N. Pires and H. S. Gimenes | Equivalence between generalized phenomenological schemes for the
interaction of cosmological fluids: applications to arbitrary linear
barotropic fluids and vacuum decay | One more reference and two figures has been added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Interactions between cosmic fluids may appear in many cosmological scenarios
that go far beyond the usually studied energy exchange in the dark sector. In
the absence of known microscopic interaction mechanisms, phenomenological
ansatzes are usually proposed in order to describe such models. In this paper,
we derive ... | [
{
"created": "Fri, 27 Feb 2015 23:23:54 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Mar 2015 21:00:31 GMT",
"version": "v2"
},
{
"created": "Sun, 26 Jul 2015 20:19:04 GMT",
"version": "v3"
}
] | 2015-07-28 | [
[
"Maia",
"M. R. G.",
""
],
[
"Pires",
"N.",
""
],
[
"Gimenes",
"H. S.",
""
]
] | Interactions between cosmic fluids may appear in many cosmological scenarios that go far beyond the usually studied energy exchange in the dark sector. In the absence of known microscopic interaction mechanisms, phenomenological ansatzes are usually proposed in order to describe such models. In this paper, we derive a ... |
1305.5668 | Lorenzo Reverberi | E.V. Arbuzova, A.D. Dolgov, L. Reverberi | Particle Production in f(R) Gravity during Structure Formation | 16 pages, 3 figures | Phys. Rev. D 88, 024035 (2013) | 10.1103/PhysRevD.88.024035 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study particle production in infrared-modified gravitational theories in
the contemporary universe. It is shown that in astronomical systems with rising
mass density, the curvature scalar may oscillate with very high frequency.
These oscillations lead to efficient particle production and in an interesting
range of... | [
{
"created": "Fri, 24 May 2013 09:50:47 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2013 12:08:50 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Arbuzova",
"E. V.",
""
],
[
"Dolgov",
"A. D.",
""
],
[
"Reverberi",
"L.",
""
]
] | We study particle production in infrared-modified gravitational theories in the contemporary universe. It is shown that in astronomical systems with rising mass density, the curvature scalar may oscillate with very high frequency. These oscillations lead to efficient particle production and in an interesting range of m... |
2301.06886 | Alexander Zhuk | Maxim Eingorn, Brianna O'Briant, Adjaratou Diouf and Alexander Zhuk | Backreaction in cosmic screening approach | 11 pages, 2 figures | Physics Letters B 839 (2023) 137797 | 10.1016/j.physletb.2023.137797 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the backreaction of nonlinear perturbations on the global
evolution of the Universe within the cosmic screening approach. To this end, we
have considered the second-order scalar perturbations. An analytical study of
these perturbations followed by a numerical evaluation shows that, first, the
correspon... | [
{
"created": "Tue, 17 Jan 2023 13:46:01 GMT",
"version": "v1"
}
] | 2023-07-04 | [
[
"Eingorn",
"Maxim",
""
],
[
"O'Briant",
"Brianna",
""
],
[
"Diouf",
"Adjaratou",
""
],
[
"Zhuk",
"Alexander",
""
]
] | We investigate the backreaction of nonlinear perturbations on the global evolution of the Universe within the cosmic screening approach. To this end, we have considered the second-order scalar perturbations. An analytical study of these perturbations followed by a numerical evaluation shows that, first, the correspondi... |
gr-qc/0604097 | Oleg Zaslavskii | O. B. Zaslavskii | Extrinsically flat static spacetimes | 25 pages. To appear in Class. Quant. Grav | Class.Quant.Grav. 23 (2006) 4083-4100 | null | null | gr-qc hep-th math.DG | null | We consider static spacetimes whose spatial part admits foliations with the
extrinsic curvature tensor K_{ab}=0. There are two complementary cases when the
gradient of the lapse function points 1) to the direction of foliation or 2)
orthogonally to it. Case 1) gives generalization of metrics like
Bertotti-Robinson or... | [
{
"created": "Fri, 21 Apr 2006 17:29:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We consider static spacetimes whose spatial part admits foliations with the extrinsic curvature tensor K_{ab}=0. There are two complementary cases when the gradient of the lapse function points 1) to the direction of foliation or 2) orthogonally to it. Case 1) gives generalization of metrics like Bertotti-Robinson or N... |
1210.3261 | Jiri Podolsky | Robert Svarc, Jiri Podolsky | Geodesic deviation in Kundt spacetimes of any dimension | 8 pages, 2 figures, to appear in the Proceedings of the conference
"Relativity and Gravitation, 100 Years after Einstein in Prague", Prague,
June 25-29, 2012 | Springer Proceedings in Physics, Vol. 157, 2014, pages 229-237 | 10.1007/978-3-319-06761-2_29 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the invariant form of the equation of geodesic deviation, which
describes relative motion of free test particles, we investigate a general
family of D-dimensional Kundt spacetimes. We demonstrate that local influence
of the gravitational field can be naturally decomposed into Newton-type tidal
effects typical f... | [
{
"created": "Thu, 11 Oct 2012 14:45:34 GMT",
"version": "v1"
}
] | 2016-04-07 | [
[
"Svarc",
"Robert",
""
],
[
"Podolsky",
"Jiri",
""
]
] | Using the invariant form of the equation of geodesic deviation, which describes relative motion of free test particles, we investigate a general family of D-dimensional Kundt spacetimes. We demonstrate that local influence of the gravitational field can be naturally decomposed into Newton-type tidal effects typical for... |
1111.6738 | Luis Herrera | L. Herrera | On the Meaning of General Covariance and the Relevance of Observers in
General Relativity | 9 pages Latex. Published in Int. J. Mod. Phys. D. Some typos
corrected | Int. J. Mod. Phys. D 20, 2773, (2011) | 10.1142/S0218271811020676. | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since the appearance of General Relativity, its intrinsec general covariance
has been very often misinterpreted as implying that physically meaningful
quantitities (and conclusions extracted from the theory) have to be absolutely
independent on observers. This incorrect point of view is sometimes expressed
by discard... | [
{
"created": "Tue, 29 Nov 2011 09:22:32 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2011 11:55:22 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Feb 2012 11:18:22 GMT",
"version": "v3"
}
] | 2012-02-20 | [
[
"Herrera",
"L.",
""
]
] | Since the appearance of General Relativity, its intrinsec general covariance has been very often misinterpreted as implying that physically meaningful quantitities (and conclusions extracted from the theory) have to be absolutely independent on observers. This incorrect point of view is sometimes expressed by discardin... |
gr-qc/9802065 | Eric W. Hirschmann | Eric W. Hirschmann and Anzhong Wang | Spherical Self-Similar Solutions in Einstein-Multi-Scalar Gravity | 11 pages, 1 figure | Phys.Lett.A249:383-388,1998 | 10.1016/S0375-9601(98)00686-0 | UTCR-98-01 | gr-qc | null | We consider a general non-linear sigma model coupled to Einstein gravity and
show that in spherical symmetry and for a simple realization of
self-similarity, the spacetime can be completely determined. We also examine
some more specific matter models and discuss their relation to critical
collapse.
| [
{
"created": "Thu, 26 Feb 1998 17:40:36 GMT",
"version": "v1"
}
] | 2009-07-07 | [
[
"Hirschmann",
"Eric W.",
""
],
[
"Wang",
"Anzhong",
""
]
] | We consider a general non-linear sigma model coupled to Einstein gravity and show that in spherical symmetry and for a simple realization of self-similarity, the spacetime can be completely determined. We also examine some more specific matter models and discuss their relation to critical collapse. |
2402.08868 | Shinji Tsujikawa | Antonio De Felice, Shinji Tsujikawa | Probing the signature of axions through the quasinormal modes of black
holes | 8 pages, 3 figures | Phys. Lett. B 855 (2024) 138808 | 10.1016/j.physletb.2024.138808 | YITP-24-19, WUCG-24-01 | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The axion-photon coupling allows the existence of a magnetically and
electrically charged black hole (BH) solution endowed with a pseudo-scalar
hair. For the Reissner-Nordstrom BH with a given total charge and mass, it is
known that the quasinormal modes (QNMs) are independent of the mixture between
the magnetic and ... | [
{
"created": "Wed, 14 Feb 2024 00:30:17 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jun 2024 23:47:11 GMT",
"version": "v2"
}
] | 2024-06-24 | [
[
"De Felice",
"Antonio",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | The axion-photon coupling allows the existence of a magnetically and electrically charged black hole (BH) solution endowed with a pseudo-scalar hair. For the Reissner-Nordstrom BH with a given total charge and mass, it is known that the quasinormal modes (QNMs) are independent of the mixture between the magnetic and el... |
gr-qc/0104043 | Daniele Oriti | Richard E. Livine and Daniele Oriti | Barrett-Crane spin foam model from generalized BF-type action for
gravity | 15 pages, revtex; a sign corrected (area spectrum); some of these
results were presented in a preliminary form in gr-qc/0103081; v2: improved
presentation of the results, some changes in the text; to appear in Phys.
Rev. D | Phys.Rev.D65:044025,2002 | 10.1103/PhysRevD.65.044025 | DAMTP-2001-85 | gr-qc hep-th | null | We study a generalized action for gravity as a constrained BF theory, and its
relationship with the Plebanski action. We analyse the discretization of the
constraints and the spin foam quantization of the theory, showing that it leads
naturally to the Barrett-Crane spin foam model for quantum gravity. Our
analysis ho... | [
{
"created": "Sun, 15 Apr 2001 13:55:28 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Apr 2001 19:06:52 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Oct 2001 16:59:38 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Livine",
"Richard E.",
""
],
[
"Oriti",
"Daniele",
""
]
] | We study a generalized action for gravity as a constrained BF theory, and its relationship with the Plebanski action. We analyse the discretization of the constraints and the spin foam quantization of the theory, showing that it leads naturally to the Barrett-Crane spin foam model for quantum gravity. Our analysis hold... |
1902.06900 | Chandramouli Chowdhury | Chandramouli Chowdhury, Susmita Das, Surojit Dalui and Bibhas Ranjan
Majhi | How robust is the indistinguishability between quantum fluctuation seen
from non-inertial frame and real thermal bath | Latex, 18 pages, 5 figures, to appear in Phys. Rev. D | Phys. Rev. D 99, 045021 (2019) | 10.1103/PhysRevD.99.045021 | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We re-advocated the conjecture of indistinguishability between the quantum
fluctuation observed from a Rindler frame and a real thermal bath, for the case
of a free massless scalar field. To clarify the robustness and how far such is
admissible, in this paper, we investigate the issue from two different
non-inertial ... | [
{
"created": "Tue, 19 Feb 2019 05:25:18 GMT",
"version": "v1"
}
] | 2019-03-06 | [
[
"Chowdhury",
"Chandramouli",
""
],
[
"Das",
"Susmita",
""
],
[
"Dalui",
"Surojit",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
]
] | We re-advocated the conjecture of indistinguishability between the quantum fluctuation observed from a Rindler frame and a real thermal bath, for the case of a free massless scalar field. To clarify the robustness and how far such is admissible, in this paper, we investigate the issue from two different non-inertial ob... |
gr-qc/9910078 | Iver H. Brevik | I. Brevik and H. B. Sandvik | Magnetohydrodynamics in the Inflationary Universe | 19 pages, LaTeX, no figures. Minor additions to the Summary section
and Acknowledgments section. Two new references. Version to appear in Phys.
Rev. D | Phys.Rev.D61:083505,2000 | 10.1103/PhysRevD.61.083505 | null | gr-qc | null | Magnetohydrodynamic (MHD) waves are analysed in the early Universe, in the
inflationary era, assuming the Universe to be filled with a nonviscous fluid of
the Zel'dovich type ($p=\rho$) in a metric of the de Sitter form. A spatially
uniform, time dependent, magnetic field ${\bf B_0}$ is assumed to be present.
The Ein... | [
{
"created": "Fri, 22 Oct 1999 15:23:55 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Dec 1999 09:17:10 GMT",
"version": "v2"
}
] | 2009-01-14 | [
[
"Brevik",
"I.",
""
],
[
"Sandvik",
"H. B.",
""
]
] | Magnetohydrodynamic (MHD) waves are analysed in the early Universe, in the inflationary era, assuming the Universe to be filled with a nonviscous fluid of the Zel'dovich type ($p=\rho$) in a metric of the de Sitter form. A spatially uniform, time dependent, magnetic field ${\bf B_0}$ is assumed to be present. The Einst... |
1807.06260 | Mahdi Godazgar | Mahdi Godazgar, Andre Kaderli | Penrose quasi-local energy and Kerr-Schild metrics | 18 pages, appendix added | null | 10.1088/1361-6382/aae444 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Specialising to the case of Kerr-Schild spacetimes, which include the Kerr
black hole and gravitational wave solutions, we propose a modification of the
Penrose quasi-local energy. The modification relies on the existence of a
natural Minkowski background for Kerr-Schild spacetimes. We find that the
modified surface ... | [
{
"created": "Tue, 17 Jul 2018 07:23:10 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Sep 2018 13:22:36 GMT",
"version": "v2"
}
] | 2018-11-14 | [
[
"Godazgar",
"Mahdi",
""
],
[
"Kaderli",
"Andre",
""
]
] | Specialising to the case of Kerr-Schild spacetimes, which include the Kerr black hole and gravitational wave solutions, we propose a modification of the Penrose quasi-local energy. The modification relies on the existence of a natural Minkowski background for Kerr-Schild spacetimes. We find that the modified surface in... |
2004.09536 | Nuno M. Santos | Nuno M. Santos, Carolina L. Benone, Lu\'is C. B. Crispino, Carlos A.
R. Herdeiro, Eugen Radu | Black holes with synchronised Proca hair: linear clouds and fundamental
non-linear solutions | 36 pages, 13 figures | null | 10.1007/JHEP07(2020)010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent studies have made key progress on the black hole/solitonic solutions
of the Einstein-Proca system. Firstly, fully non-linear dynamical evolutions of
the Kerr black hole superradiant instability, triggered by a Proca field, have
shown the formation of a new equilibrium state, a spinning black hole with
synchron... | [
{
"created": "Mon, 20 Apr 2020 18:00:10 GMT",
"version": "v1"
}
] | 2020-07-15 | [
[
"Santos",
"Nuno M.",
""
],
[
"Benone",
"Carolina L.",
""
],
[
"Crispino",
"Luís C. B.",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Radu",
"Eugen",
""
]
] | Recent studies have made key progress on the black hole/solitonic solutions of the Einstein-Proca system. Firstly, fully non-linear dynamical evolutions of the Kerr black hole superradiant instability, triggered by a Proca field, have shown the formation of a new equilibrium state, a spinning black hole with synchronis... |
gr-qc/9911063 | Hideo Iguchi | Hideo Iguchi, Tomohiro Harada, and Ken-ichi Nakao | Gravitational Radiation from a Naked Singularity. II - Even-Parity
Perturbation - | 16 pages, 5 figures, errors and typos corrected, final version | Prog.Theor.Phys. 103 (2000) 53-72 | 10.1143/PTP.103.53 | KUNS 1614 | gr-qc | null | A naked singularity occurs in the generic collapse of an inhomogeneous dust
ball. We study the even-parity mode of gravitational waves from a naked
singularity of the Lema\^{\i}tre-Tolman-Bondi spacetime. The wave equations for
gravitational waves are solved by numerical integration using the single null
coordinate. ... | [
{
"created": "Thu, 18 Nov 1999 01:46:40 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 2000 03:25:57 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Iguchi",
"Hideo",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Nakao",
"Ken-ichi",
""
]
] | A naked singularity occurs in the generic collapse of an inhomogeneous dust ball. We study the even-parity mode of gravitational waves from a naked singularity of the Lema\^{\i}tre-Tolman-Bondi spacetime. The wave equations for gravitational waves are solved by numerical integration using the single null coordinate. Th... |
2311.14040 | Georgios Lukes-Gerakopoulos | Georgios Lukes-Gerakopoulos and Sajal Mukherjee | Can extended bodies follow geodesic trajectories? | 8 pages, Proceedings of RAGtime 23-25, Edited by Z. Stuchl\'{i}k, G.
T\"{o}r\"{o}k , V. Karas and D. Lan\v{c}ov\'{a}, Silesian University in Opava | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide an extension of the analysis on whether an extended test body can
follow a geodesic trajectory given by Mukherjee, S., Lukes-Gerakopoulos, G. and
Nayak, R. K. (2022), Extended bodies moving on geodesic trajectories, General
Relativity and Gravitation, 54(9), 113, arXiv: 1907.05659. In particular, we
consid... | [
{
"created": "Thu, 23 Nov 2023 14:48:25 GMT",
"version": "v1"
}
] | 2023-11-27 | [
[
"Lukes-Gerakopoulos",
"Georgios",
""
],
[
"Mukherjee",
"Sajal",
""
]
] | We provide an extension of the analysis on whether an extended test body can follow a geodesic trajectory given by Mukherjee, S., Lukes-Gerakopoulos, G. and Nayak, R. K. (2022), Extended bodies moving on geodesic trajectories, General Relativity and Gravitation, 54(9), 113, arXiv: 1907.05659. In particular, we consider... |
1609.06915 | Emil Nissimov | Eduardo Guendelman, Emil Nissimov, Svetlana Pacheva | Quintessential Inflation, Unified Dark Energy and Dark Matter, and Higgs
Mechanism | 15 pages, to appear in the Proc. of 3rd Bulgarian National Congress
on Physical Sciences (Sept-Oct 2016), Bulgarian Journal of Physics, vol.43
(2016) | Bulgarian Journal of Physics 44 (2017) 15-30 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a new type of gravity-matter models where gravity couples in a
non-conventional way to two distinct scalar fields providing a unified
Lagrangian action principle description of: (a) the evolution of both "early"
and "late" Universe - by the "inflaton" scalar field; (b) dark energy and dark
matter as a uni... | [
{
"created": "Thu, 22 Sep 2016 11:19:41 GMT",
"version": "v1"
}
] | 2017-07-25 | [
[
"Guendelman",
"Eduardo",
""
],
[
"Nissimov",
"Emil",
""
],
[
"Pacheva",
"Svetlana",
""
]
] | We describe a new type of gravity-matter models where gravity couples in a non-conventional way to two distinct scalar fields providing a unified Lagrangian action principle description of: (a) the evolution of both "early" and "late" Universe - by the "inflaton" scalar field; (b) dark energy and dark matter as a unifi... |
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