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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0706.3452 | Luis Nunez A | H. Abreu, H. Hernandez and L.A. Nunez | Sound Speeds, Cracking and Stability of Self-Gravitating Anisotropic
Compact Objects | 17 pages, 8 figures, 4 new references added. typos corrected | Class.Quant.Grav.24:4631-4646,2007 | 10.1088/0264-9381/24/18/005 | null | gr-qc | null | Using the the concept of cracking we explore the influence of density
fluctuations and local anisotropy have on the stability of local and non-local
anisotropic matter configurations in general relativity. This concept,
conceived to describe the behaviour of a fluid distribution just after its
departure from equilibr... | [
{
"created": "Sat, 23 Jun 2007 12:15:22 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Jul 2007 16:57:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Abreu",
"H.",
""
],
[
"Hernandez",
"H.",
""
],
[
"Nunez",
"L. A.",
""
]
] | Using the the concept of cracking we explore the influence of density fluctuations and local anisotropy have on the stability of local and non-local anisotropic matter configurations in general relativity. This concept, conceived to describe the behaviour of a fluid distribution just after its departure from equilibriu... |
2108.05273 | Junji Jia | Zonghai Li, Junji Jia | Kerr-Newman-Jacobi geometry and the deflection of charged massive
particles | 14 pages, 1 figure, to appear in PRD | null | 10.1103/PhysRevD.104.044061 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the deflection of a charged particle moving in
the equatorial plane of Kerr-Newman spacetime, focusing on weak field limit. To
this end, we use the Jacobi geometry, which can be described in three
equivalent forms, namely Randers-Finsler metric, Zermelo navigation problem,
and $(n+1)$-di... | [
{
"created": "Wed, 11 Aug 2021 15:15:35 GMT",
"version": "v1"
}
] | 2021-09-08 | [
[
"Li",
"Zonghai",
""
],
[
"Jia",
"Junji",
""
]
] | In this paper, we investigate the deflection of a charged particle moving in the equatorial plane of Kerr-Newman spacetime, focusing on weak field limit. To this end, we use the Jacobi geometry, which can be described in three equivalent forms, namely Randers-Finsler metric, Zermelo navigation problem, and $(n+1)$-dime... |
2304.13749 | Alexandre M. Pombo | Alexandre M. Pombo, Jo\~ao M. S. Oliveira, Nuno M. Santos | Scalaroca stars: coupled scalar-Proca solitons | 21 pages, 13 figures, this project was started before the recently
published work ArXiv:2304.08019 | null | 10.1103/PhysRevD.108.044044 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct and explore the physical properties of \textit{scalaroca stars}:
spherically symmetric solitonic solutions made of a complex scalar field $\Phi$
and a complex Proca field $A^\mu$. We restrict our attention to configurations
in which both fields are in the fundamental state and possess an equal mass,
focu... | [
{
"created": "Wed, 26 Apr 2023 18:00:03 GMT",
"version": "v1"
}
] | 2023-09-26 | [
[
"Pombo",
"Alexandre M.",
""
],
[
"Oliveira",
"João M. S.",
""
],
[
"Santos",
"Nuno M.",
""
]
] | We construct and explore the physical properties of \textit{scalaroca stars}: spherically symmetric solitonic solutions made of a complex scalar field $\Phi$ and a complex Proca field $A^\mu$. We restrict our attention to configurations in which both fields are in the fundamental state and possess an equal mass, focusi... |
2012.07813 | Klaus Liegener Dr | Klaus Liegener, {\L}ukasz Rudnicki | Algorithmic approach to Cosmological Coherent State Expectation Values
in LQG | 33 pages; This paper summarizes the results announced at Loops'19
Conference [http://gravity.psu.edu/events/loops19/index-loops19.shtml]. First
draft - minor typos can still be found | Class. Quantum Grav. 38, 205001 (2021) | 10.1088/1361-6382/ac226f | null | gr-qc hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the lattice approach to Loop Quantum Gravity on a fixed graph computations
tend to be involved and are rarely analytically manageable. But, when
interested in the expectation values of coherent states on the lattice which
are sharply peaked on isotropic, flat cosmology several simplifications are
possible which re... | [
{
"created": "Mon, 14 Dec 2020 18:46:05 GMT",
"version": "v1"
}
] | 2021-11-01 | [
[
"Liegener",
"Klaus",
""
],
[
"Rudnicki",
"Łukasz",
""
]
] | In the lattice approach to Loop Quantum Gravity on a fixed graph computations tend to be involved and are rarely analytically manageable. But, when interested in the expectation values of coherent states on the lattice which are sharply peaked on isotropic, flat cosmology several simplifications are possible which redu... |
1308.5258 | Cl\'audio Nassif Cruz | Cl\'audio Nassif | On the electrodynamics of moving particles in a quasi flat spacetime
with Lorentz violation and its cosmological implications | 49 pages and 7 figures. arXiv admin note: substantial text overlap
with arXiv:physics/0702095, arXiv:0711.4897.
http://www.worldscientific.com/worldscinet/ijmpd?journalTabs=read. text
overlap with arXiv:0705.1836 by other authors | International Journal of Modern Physics D25:10, p.1-67 (2016) | 10.1142/S0218271816500966 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This research aims to develop a new approach toward a consistent coupling of
electromagnetic and gravitational fields by using an electron that couples with
a weak gravitational potential by means of its electromagnetic field. We find
the value of the tiny coupling constant of gravity with electromagnetic fields,
whi... | [
{
"created": "Fri, 23 Aug 2013 22:34:17 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2013 12:11:16 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Oct 2014 17:55:37 GMT",
"version": "v3"
},
{
"created": "Thu, 29 Oct 2015 02:14:51 GMT",
"version": "v4"
},
{
"c... | 2017-01-09 | [
[
"Nassif",
"Cláudio",
""
]
] | This research aims to develop a new approach toward a consistent coupling of electromagnetic and gravitational fields by using an electron that couples with a weak gravitational potential by means of its electromagnetic field. We find the value of the tiny coupling constant of gravity with electromagnetic fields, which... |
1904.10333 | Alexander Zhidenko | R. A. Konoplya, A. Zhidenko, A. F. Zinhailo | Higher order WKB formula for quasinormal modes and grey-body factors:
recipes for quick and accurate calculations | 15 pages (revtex), 4 figures | Class. Quantum Grav. 36: 155002 (2019) | 10.1088/1361-6382/ab2e25 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The WKB approach for finding quasinormal modes of black holes, suggested in
[1] by Schutz and Will at the first order and later developed to higher orders
[2-4], became popular during the past decades, because, unlike more
sophisticated numerical approaches, it is automatic for different effective
potentials and most... | [
{
"created": "Tue, 23 Apr 2019 13:55:18 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jul 2019 15:48:14 GMT",
"version": "v2"
}
] | 2019-07-15 | [
[
"Konoplya",
"R. A.",
""
],
[
"Zhidenko",
"A.",
""
],
[
"Zinhailo",
"A. F.",
""
]
] | The WKB approach for finding quasinormal modes of black holes, suggested in [1] by Schutz and Will at the first order and later developed to higher orders [2-4], became popular during the past decades, because, unlike more sophisticated numerical approaches, it is automatic for different effective potentials and mostly... |
1406.0126 | Alfredo Lopez Ortega | A. Lopez-Ortega | Electromagnetic quasinormal modes of an asymptotically Lifshitz black
hole | 19 pages. Accepted for publication | null | 10.1007/s10714-014-1756-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent interest in the study of the spacetimes that are
asymptotically Lifshitz and in order to extend some previous results, we
calculate exactly the quasinormal frequencies of the electromagnetic field in a
D-dimensional asymptotically Lifshitz black hole. Based on the values obtained
for the quasi... | [
{
"created": "Sun, 1 Jun 2014 02:30:09 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Lopez-Ortega",
"A.",
""
]
] | Motivated by the recent interest in the study of the spacetimes that are asymptotically Lifshitz and in order to extend some previous results, we calculate exactly the quasinormal frequencies of the electromagnetic field in a D-dimensional asymptotically Lifshitz black hole. Based on the values obtained for the quasino... |
1101.5419 | Oscar Loaiza-Brito | Filemon Farfan, Ricardo Garcia-Salcedo, Oscar Loaiza-Brito, Claudia
Moreno, Alexander Yakhno | Spherically symmetric solution in a space-time with torsion | (v1) 14 pages, 3 figures. (v2) Version accepted for publication in
General Relativity and Gravitation | null | 10.1007/s10714-011-1293-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using the method of group analysis, we obtain a new exact evolving and
spherically symmetric solution of the Einstein-Cartan equations of motion,
corresponding to a space-time threaded with a three-form Kalb-Ramond field
strength. The solution describes in its more generic form, a space-time which
scalar curvature... | [
{
"created": "Fri, 28 Jan 2011 00:39:53 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Oct 2011 22:49:22 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Farfan",
"Filemon",
""
],
[
"Garcia-Salcedo",
"Ricardo",
""
],
[
"Loaiza-Brito",
"Oscar",
""
],
[
"Moreno",
"Claudia",
""
],
[
"Yakhno",
"Alexander",
""
]
] | By using the method of group analysis, we obtain a new exact evolving and spherically symmetric solution of the Einstein-Cartan equations of motion, corresponding to a space-time threaded with a three-form Kalb-Ramond field strength. The solution describes in its more generic form, a space-time which scalar curvature v... |
1403.0544 | Richard O'Shaughnessy | (1) R. O'Shaughnessy, (2) B. Farr, (1) E. Ochsner, (3) H.S. Cho, (4)
V. Raymond, (5) C. Kim, (3) C.H. Lee ((1) University of Wisconsin-Milwaukee,
(2) Northwestern University, (3) Pusan National University, (4) California
Institute of Technology, (5) Seoul National University) | Parameter Estimation of Gravitational Waves from Precessing BH-NS
Inspirals with higher harmonics | v2: typographical fixes; new subsection | null | 10.1103/PhysRevD.89.102005 | LIGO DCC P1400020 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Precessing black hole-neutron star (BH-NS) binaries produce a rich
gravitational wave signal, encoding the binary's nature and inspiral
kinematics. Using the lalinference\_mcmc Markov-chain Monte Carlo parameter
estimation code, we use two fiducial examples to illustrate how the geometry
and kinematics are encoded in... | [
{
"created": "Mon, 3 Mar 2014 19:55:07 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Apr 2014 15:22:26 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"O'Shaughnessy",
"R.",
""
],
[
"Farr",
"B.",
""
],
[
"Ochsner",
"E.",
""
],
[
"Cho",
"H. S.",
""
],
[
"Raymond",
"V.",
""
],
[
"Kim",
"C.",
""
],
[
"Lee",
"C. H.",
""
]
] | Precessing black hole-neutron star (BH-NS) binaries produce a rich gravitational wave signal, encoding the binary's nature and inspiral kinematics. Using the lalinference\_mcmc Markov-chain Monte Carlo parameter estimation code, we use two fiducial examples to illustrate how the geometry and kinematics are encoded into... |
gr-qc/9805065 | Domenico Giulini | Domenico Giulini | The Generalized Thin-Sandwich Problem and its Local Solvability | 18 pages, Plain TeX | J.Math.Phys. 40 (1999) 2470-2482 | 10.1063/1.532877 | ZU-TH 9/98 | gr-qc | null | We consider Einstein Gravity coupled to dynamical matter consisting of a
gauge field with any compact gauge group and minimally coupled scalar fields.
We investigate the conditions under which a free specification of a spatial
field configuration for the total system and its derivative with respect to
coordinate-time... | [
{
"created": "Mon, 18 May 1998 11:37:10 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Giulini",
"Domenico",
""
]
] | We consider Einstein Gravity coupled to dynamical matter consisting of a gauge field with any compact gauge group and minimally coupled scalar fields. We investigate the conditions under which a free specification of a spatial field configuration for the total system and its derivative with respect to coordinate-time d... |
0801.2673 | Silke Weinfurtner | Silke Weinfurtner, Piyush Jain, Matt Visser, C.W. Gardiner | Cosmological particle production in emergent rainbow spacetimes | null | Class.Quant.Grav.26:065012,2009 | 10.1088/0264-9381/26/6/065012 | null | gr-qc | null | We investigate cosmological particle production in spacetimes where Lorentz
invariance emerges in the infrared limit, but is explicitly broken in the
ultraviolet regime. Our specific model focuses on the boost subgroup that
supports CPT invariance and results in a momentum-dependent dispersion
relation. Motivated by ... | [
{
"created": "Thu, 17 Jan 2008 02:40:21 GMT",
"version": "v1"
}
] | 2009-03-27 | [
[
"Weinfurtner",
"Silke",
""
],
[
"Jain",
"Piyush",
""
],
[
"Visser",
"Matt",
""
],
[
"Gardiner",
"C. W.",
""
]
] | We investigate cosmological particle production in spacetimes where Lorentz invariance emerges in the infrared limit, but is explicitly broken in the ultraviolet regime. Our specific model focuses on the boost subgroup that supports CPT invariance and results in a momentum-dependent dispersion relation. Motivated by pr... |
2403.03147 | Giovanni Maria Tomaselli | Giovanni Maria Tomaselli, Thomas F.M. Spieksma, Gianfranco Bertone | The resonant history of gravitational atoms in black hole binaries | 36+9 pages, 16 figures | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rotating black holes can produce superradiant clouds of ultralight bosons.
When the black hole is part of a binary system, its cloud can undergo
resonances and ionization. These processes leave a distinct signature on the
gravitational waveform that depends on the cloud's properties. To determine the
state of the clo... | [
{
"created": "Tue, 5 Mar 2024 17:38:19 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Mar 2024 10:46:31 GMT",
"version": "v2"
}
] | 2024-04-02 | [
[
"Tomaselli",
"Giovanni Maria",
""
],
[
"Spieksma",
"Thomas F. M.",
""
],
[
"Bertone",
"Gianfranco",
""
]
] | Rotating black holes can produce superradiant clouds of ultralight bosons. When the black hole is part of a binary system, its cloud can undergo resonances and ionization. These processes leave a distinct signature on the gravitational waveform that depends on the cloud's properties. To determine the state of the cloud... |
2003.05342 | Andronikos Paliathanasis | Andronikos Paliathanasis | Dynamics of Chiral Cosmology | 20 pages, 10 figures, 1 table, version accepted for publication in
Classical and Quantum Gravity | Class. Quantum Grav. 37 (2020) 19, 195014 | 10.1088/1361-6382/aba667 | null | gr-qc astro-ph.CO hep-ph | http://creativecommons.org/licenses/by/4.0/ | We perform a detailed analysis for the dynamics of Chiral cosmology in a
spatially flat Friedmann-Lema\^{\i}tre-Robertson-Walker universe with a mixed
potential term. The stationary points are categorized in four families.
Previous results in the literature are recovered while new phases in the
cosmological evolution... | [
{
"created": "Wed, 11 Mar 2020 14:58:05 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2020 06:41:06 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Oct 2021 05:50:53 GMT",
"version": "v3"
}
] | 2021-10-14 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | We perform a detailed analysis for the dynamics of Chiral cosmology in a spatially flat Friedmann-Lema\^{\i}tre-Robertson-Walker universe with a mixed potential term. The stationary points are categorized in four families. Previous results in the literature are recovered while new phases in the cosmological evolution a... |
1505.03863 | Jose' P. S. Lemos | Jos\'e P. S. Lemos, Vilson T. Zanchin | Sharp bounds on the radius of relativistic charged spheres: Guilfoyle's
stars saturate the Buchdahl-Andr\'easson bound | 10 pages, 3 figures | Classical and Quantum Gravity 32, 135009 (2015) | 10.1088/0264-9381/32/13/135009 | null | gr-qc astro-ph.SR hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Buchdahl, by imposing a few physical assumptions on the matter, i.e., its
density is a nonincreasing function of the radius and the fluid is a perfect
fluid, and on the configuration, such as the exterior is the Schwarzschild
solution, found that the radius $r_0$ to mass $m$ ratio of a star would obey
the Buchdahl bo... | [
{
"created": "Thu, 14 May 2015 20:00:30 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Lemos",
"José P. S.",
""
],
[
"Zanchin",
"Vilson T.",
""
]
] | Buchdahl, by imposing a few physical assumptions on the matter, i.e., its density is a nonincreasing function of the radius and the fluid is a perfect fluid, and on the configuration, such as the exterior is the Schwarzschild solution, found that the radius $r_0$ to mass $m$ ratio of a star would obey the Buchdahl boun... |
gr-qc/0608063 | Jose Luis Flores | Jose L. Flores | The Causal Boundary of spacetimes revisited | 37 pages, 10 figures; Definition 6.1 slightly modified; multiple
minor changes; one figure added and another replaced | Commun.Math.Phys.276:611-643,2007 | 10.1007/s00220-007-0345-9 | null | gr-qc | null | We present a new development of the causal boundary of spacetimes, originally
introduced by Geroch, Kronheimer and Penrose. Given a strongly causal spacetime
(or, more generally, a chronological set), we reconsider the GKP ideas to
construct a family of completions with a chronology and topology extending the
origina... | [
{
"created": "Fri, 11 Aug 2006 17:18:29 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Aug 2006 07:51:55 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Mar 2007 12:35:33 GMT",
"version": "v3"
},
{
"created": "Thu, 6 Sep 2007 07:03:40 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Flores",
"Jose L.",
""
]
] | We present a new development of the causal boundary of spacetimes, originally introduced by Geroch, Kronheimer and Penrose. Given a strongly causal spacetime (or, more generally, a chronological set), we reconsider the GKP ideas to construct a family of completions with a chronology and topology extending the original ... |
gr-qc/9903082 | Manuela Campanelli | Manuela Campanelli (Max-Planck-Institut fuer Gravitationsphysik,
Albert-Einstein-Institut, Potsdam, Germany) | Black hole collisions: how far can perturbation theory go? | 6 pages, Latex, uses moriond.sty, proceedings of the talk given at
the Moriond 99' euroconference | null | null | null | gr-qc | null | The computation of gravitational radiation generated by the coalescence of
inspiralling binary black holes is nowdays one of the main goals of numerical
relativity. Perturbation theory has emerged as an ubiquitous tool for all those
dynamical evolutions where the two black holes start close enough to each
other, to b... | [
{
"created": "Sun, 21 Mar 1999 10:40:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Campanelli",
"Manuela",
"",
"Max-Planck-Institut fuer Gravitationsphysik,\n Albert-Einstein-Institut, Potsdam, Germany"
]
] | The computation of gravitational radiation generated by the coalescence of inspiralling binary black holes is nowdays one of the main goals of numerical relativity. Perturbation theory has emerged as an ubiquitous tool for all those dynamical evolutions where the two black holes start close enough to each other, to be ... |
2004.07752 | Xian Gao | Xian Gao and Yu-Min Hu | Higher derivative scalar-tensor theory and spatially covariant gravity:
the correspondence | 19 pages | Phys. Rev. D 102, 084006 (2020) | 10.1103/PhysRevD.102.084006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the correspondence between generally covariant higher
derivative scalar-tensor theory and spatially covariant gravity theory. The
building blocks are the scalar field and spacetime curvature tensor together
with their generally covariant derivatives for the former, and the spatially
covariant geometric... | [
{
"created": "Thu, 16 Apr 2020 16:37:15 GMT",
"version": "v1"
}
] | 2020-10-07 | [
[
"Gao",
"Xian",
""
],
[
"Hu",
"Yu-Min",
""
]
] | We investigate the correspondence between generally covariant higher derivative scalar-tensor theory and spatially covariant gravity theory. The building blocks are the scalar field and spacetime curvature tensor together with their generally covariant derivatives for the former, and the spatially covariant geometric q... |
0803.4446 | Tomasz Pawlowski | Eloisa Bentivegna, Tomasz Pawlowski | Anti-deSitter universe dynamics in LQC | Revtex4, 29 pages, 20 figures, typos corrected | Phys.Rev.D77:124025,2008 | 10.1103/PhysRevD.77.124025 | IGC-08/3-3 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model for a flat isotropic universe with a negative cosmological constant
$\Lambda$ and a massless scalar field as sole matter content is studied within
the framework of Loop Quantum Cosmology. By application of the methods
introduced for the model with $\Lambda=0$, the physical Hilbert space and the
set of Dirac o... | [
{
"created": "Mon, 31 Mar 2008 14:19:27 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Apr 2008 16:06:28 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bentivegna",
"Eloisa",
""
],
[
"Pawlowski",
"Tomasz",
""
]
] | A model for a flat isotropic universe with a negative cosmological constant $\Lambda$ and a massless scalar field as sole matter content is studied within the framework of Loop Quantum Cosmology. By application of the methods introduced for the model with $\Lambda=0$, the physical Hilbert space and the set of Dirac obs... |
gr-qc/0302004 | Tomohiro Harada | Tomohiro Harada | Self-Similar Solutions, Critical Behavior and Convergence to Attractor
in Gravitational Collapse | 14 pages, invited review talk given at the 12th Workshop on General
Relativity and Gravitation, Nov 25-28, 2002, Tokyo, Japan | null | null | WU-AP/156/03 | gr-qc | null | General relativity as well as Newtonian gravity admits self-similar solutions
due to its scale-invariance. This is a review on these self-similar solutions
and their relevance to gravitational collapse. In particular, our attention is
mainly paid on the crucial role of self-similar solutions in the critical
behavior ... | [
{
"created": "Mon, 3 Feb 2003 10:23:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Harada",
"Tomohiro",
""
]
] | General relativity as well as Newtonian gravity admits self-similar solutions due to its scale-invariance. This is a review on these self-similar solutions and their relevance to gravitational collapse. In particular, our attention is mainly paid on the crucial role of self-similar solutions in the critical behavior an... |
2406.13690 | Pabitra Tripathy | Pabitra Tripathy | Lower bound of black hole hair in pure Lovelock theory of gravity | 6 pages, 1 figure | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | As an alternative to the "no hair conjecture," the "no short hair conjecture"
for hairy black holes was established earlier. This theorem stipulates that
hair must be present above 3/2 of the event horizon radius for a hairy black
hole. It is assumed that the nonlinear behavior of the matter field plays a key
role in... | [
{
"created": "Wed, 19 Jun 2024 16:42:13 GMT",
"version": "v1"
}
] | 2024-06-21 | [
[
"Tripathy",
"Pabitra",
""
]
] | As an alternative to the "no hair conjecture," the "no short hair conjecture" for hairy black holes was established earlier. This theorem stipulates that hair must be present above 3/2 of the event horizon radius for a hairy black hole. It is assumed that the nonlinear behavior of the matter field plays a key role in t... |
2105.02289 | Claudia Moreno | Jaime Mendoza Hernandez, Mauricio Bellini, Claudia Moreno | Space-time waves from a collapsing universe with a gravitational
attractor | 10 pages, 2 figures | Physics of the Dark Universe, 30 (2020) 100703 | 10.1016/j.dark.2020.100703 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a collapsing system attracted by a spherically symmetric
gravitational source, with an increasing mass, that generates back-reaction
effects that are the source of space-time waves. As an example, we consider an
exponential collapse and the space-time waves emitted during this collapse due
to the back-reacti... | [
{
"created": "Wed, 5 May 2021 19:15:04 GMT",
"version": "v1"
}
] | 2021-05-07 | [
[
"Hernandez",
"Jaime Mendoza",
""
],
[
"Bellini",
"Mauricio",
""
],
[
"Moreno",
"Claudia",
""
]
] | We study a collapsing system attracted by a spherically symmetric gravitational source, with an increasing mass, that generates back-reaction effects that are the source of space-time waves. As an example, we consider an exponential collapse and the space-time waves emitted during this collapse due to the back-reaction... |
1512.05713 | Mauricio Bellini | Jes\'us Mart\'in Romero, Mauricio Bellini, Jos\'e Edgar Madriz Aguilar | Gravitational waves from a Weyl-Integrable manifold: a new formalism | Accepted in Physics of the Dark Universe | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the variational principle over an Hilbert-Einstein like action for
an extended geometry taking into account torsion and non-metricity. By
extending the semi-Riemannian geometry, we obtain an effective energy-momentum
tensor which can be interpreted as physical sources. As an application we
develop a new mann... | [
{
"created": "Thu, 17 Dec 2015 18:34:07 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 2016 00:19:48 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Mar 2016 17:50:34 GMT",
"version": "v3"
}
] | 2016-03-30 | [
[
"Romero",
"Jesús Martín",
""
],
[
"Bellini",
"Mauricio",
""
],
[
"Aguilar",
"José Edgar Madriz",
""
]
] | We study the variational principle over an Hilbert-Einstein like action for an extended geometry taking into account torsion and non-metricity. By extending the semi-Riemannian geometry, we obtain an effective energy-momentum tensor which can be interpreted as physical sources. As an application we develop a new manner... |
gr-qc/0202030 | Alfredo Sandoval-Villalbazo | Ana Laura Garc\'ia-Perciante, Alfredo Sandoval-Villalbazo, and L.S.
Garc\'ia Col\'in | A six dimensional analysis of Maxwell's Field Equations | 8 pages, RevTex. Submitted to Revista Mexicana de F\'{i}sica | null | null | null | gr-qc | null | A framework based on an extension of Kaluza's original idea of using a five
dimensional space to unify gravity with electromagnetism is used to analyze
Maxwell\'{}s field equations. The extension consists in the use of a six
dimensional space in which all equations of electromagnetism may be obtained
using only Einst... | [
{
"created": "Fri, 8 Feb 2002 17:08:19 GMT",
"version": "v1"
}
] | 2016-08-16 | [
[
"García-Perciante",
"Ana Laura",
""
],
[
"Sandoval-Villalbazo",
"Alfredo",
""
],
[
"Colín",
"L. S. García",
""
]
] | A framework based on an extension of Kaluza's original idea of using a five dimensional space to unify gravity with electromagnetism is used to analyze Maxwell\'{}s field equations. The extension consists in the use of a six dimensional space in which all equations of electromagnetism may be obtained using only Einstei... |
1803.05833 | Willians Barreto | W. Barreto, P. C.M. Clemente, H. P. de Oliveira, B. Rodriguez-Mueller | Rio: A new computational framework for accurate initial data of binary
black holes | 15 pages, 6 figures; updated version to appear in Gen. Rel. Grav | Gen Relativ Gravit (2018) 50: 71 | 10.1007/s10714-018-2393-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a computational framework (Rio) in the ADM 3+1 approach for
numerical relativity. This work enables us to carry out high resolution
calculations for initial data of two arbitrary black holes. We use the
transverse conformal treatment, the Bowen-York and the puncture methods. For
the numerical solution of t... | [
{
"created": "Thu, 15 Mar 2018 16:10:17 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Apr 2018 20:12:49 GMT",
"version": "v2"
},
{
"created": "Wed, 23 May 2018 12:49:41 GMT",
"version": "v3"
}
] | 2018-06-12 | [
[
"Barreto",
"W.",
""
],
[
"Clemente",
"P. C. M.",
""
],
[
"de Oliveira",
"H. P.",
""
],
[
"Rodriguez-Mueller",
"B.",
""
]
] | We present a computational framework (Rio) in the ADM 3+1 approach for numerical relativity. This work enables us to carry out high resolution calculations for initial data of two arbitrary black holes. We use the transverse conformal treatment, the Bowen-York and the puncture methods. For the numerical solution of the... |
gr-qc/0112078 | Helio V. Fagundes | Helio V. Fagundes (Instituto de Fisica Teorica, Universidade Estadual
Paulista, Sao Paulo, Brazil) | Exploring the global topology of the universe | 4 pages. Contribution to the XXII Brazilian National Meeting on
Particles and Fields, Sao Lourenco, October 2001 | Braz.J.Phys. 32 (2002) 891-894 | null | null | gr-qc astro-ph hep-th | null | In this talk work done by our group on cosmic topology is reviewed. It ranges
from early attempts to solve a famous controversy about quasars through the
multiplicity of images, to quantum cosmology in this context and an application
to QED renormalization.
| [
{
"created": "Sun, 30 Dec 2001 14:29:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fagundes",
"Helio V.",
"",
"Instituto de Fisica Teorica, Universidade Estadual\n Paulista, Sao Paulo, Brazil"
]
] | In this talk work done by our group on cosmic topology is reviewed. It ranges from early attempts to solve a famous controversy about quasars through the multiplicity of images, to quantum cosmology in this context and an application to QED renormalization. |
gr-qc/0606081 | Aleksandar Mikovic | A. Mikovic | Errata to "Flat Spacetime Vacuum in Loop Quantum Gravity" | 3 pages, 1 figure | Class.Quant.Grav.23:5459-5462,2006 | 10.1088/0264-9381/23/17/C01 | null | gr-qc | null | We give the correct expressions for the spin network evaluations proposed in
Class. Quant. Grav. 21 (2004) 3909 as the coefficients of the quantum gravity
vacuum wavefunction in the spin network basis.
| [
{
"created": "Mon, 19 Jun 2006 15:39:54 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Mikovic",
"A.",
""
]
] | We give the correct expressions for the spin network evaluations proposed in Class. Quant. Grav. 21 (2004) 3909 as the coefficients of the quantum gravity vacuum wavefunction in the spin network basis. |
gr-qc/9906112 | Michael Martin Nieto | John D. Anderson, Philip A. Laing, Eunice L. Lau, Anthony S. Liu,
Michael Martin Nieto, and Slava G. Turyshev | Anderson et al. Reply (to the Comment by Katz on Pioneer 10/11) | LaTex, 3 pages, Phys. Rev. Lett. (to be published) | Phys.Rev.Lett. 83 (1999) 1893 | 10.1103/PhysRevLett.83.1893 | LA-UR-98-5522 | gr-qc astro-ph | null | We conclude that Katz's proposal (anisotropic heat reflection off of the back
of the spacecraft high-gain antennae, the heat coming from the RTGs) does not
provide enough power and so can not explain the Pioneer anomaly.
| [
{
"created": "Tue, 29 Jun 1999 03:11:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Anderson",
"John D.",
""
],
[
"Laing",
"Philip A.",
""
],
[
"Lau",
"Eunice L.",
""
],
[
"Liu",
"Anthony S.",
""
],
[
"Nieto",
"Michael Martin",
""
],
[
"Turyshev",
"Slava G.",
""
]
] | We conclude that Katz's proposal (anisotropic heat reflection off of the back of the spacecraft high-gain antennae, the heat coming from the RTGs) does not provide enough power and so can not explain the Pioneer anomaly. |
1204.1859 | Wei-Tou Ni | Wei-Tou Ni | Equivalence Principles, Lense-Thirring Effects, and Solar-System Tests
of Cosmological Models | 7 pages, 1 table, plenary talk presented at ICGAC10 (Xth
International Conference on Gravitation, Astrophysics and Cosmology),
Quy-Nhon, Vietnam, December 17-22, 2011 | null | null | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, we review the empirical status for modern gravitational
theories with emphases on (i) Equivalence Principles; (ii) Lense-Thirring
effects and the implications of Gravity Probe B experiment; (iii) Solar-System
Tests of Cosmological Models.
| [
{
"created": "Mon, 9 Apr 2012 11:37:53 GMT",
"version": "v1"
}
] | 2012-04-10 | [
[
"Ni",
"Wei-Tou",
""
]
] | In this talk, we review the empirical status for modern gravitational theories with emphases on (i) Equivalence Principles; (ii) Lense-Thirring effects and the implications of Gravity Probe B experiment; (iii) Solar-System Tests of Cosmological Models. |
1506.01101 | Miftachul Hadi | Miftachul Hadi, Malcolm Anderson, Andri Husein | The Gravitational Field of a Twisted Skyrmion String | 5 pages, no figure, presented at ICMNS Bandung, Indonesia, 2 Nov 2014
and submitted to AIP Conference Proceedings | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the gravitational field of a straight string generated
from a class of nonlinear sigma models, specifically the Skyrme model with a
twist (the twisted Skyrmion string). The twist term, mkz, is included to
stabilize the vortex solution. To model the effects of gravity, we replace the
Minkowski t... | [
{
"created": "Wed, 3 Jun 2015 01:18:44 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jun 2015 00:44:06 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Jul 2015 08:03:28 GMT",
"version": "v3"
}
] | 2015-07-14 | [
[
"Hadi",
"Miftachul",
""
],
[
"Anderson",
"Malcolm",
""
],
[
"Husein",
"Andri",
""
]
] | In this paper we study the gravitational field of a straight string generated from a class of nonlinear sigma models, specifically the Skyrme model with a twist (the twisted Skyrmion string). The twist term, mkz, is included to stabilize the vortex solution. To model the effects of gravity, we replace the Minkowski ten... |
1804.11198 | Mohamed Bennai | A. Safsafi and I. Khay and F. Salamate and H. Chakir and M. Bennai | On Chaplygin Gas Braneworld Inflation with Monomial Potential | 7 figures. arXiv admin note: text overlap with arXiv:0805.1005 by
other authors | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | In this paper we study the Chaplygin gas model as a candidate for inflation
in the framework of the Randall Sundrum type-II braneworld model. We consider
the original and generalized Chaplygin gas model in the presence of monomial
potential. The inflationary spectrum perturbation parameters are reformulated
and evalu... | [
{
"created": "Thu, 26 Apr 2018 11:22:16 GMT",
"version": "v1"
}
] | 2018-05-01 | [
[
"Safsafi",
"A.",
""
],
[
"Khay",
"I.",
""
],
[
"Salamate",
"F.",
""
],
[
"Chakir",
"H.",
""
],
[
"Bennai",
"M.",
""
]
] | In this paper we study the Chaplygin gas model as a candidate for inflation in the framework of the Randall Sundrum type-II braneworld model. We consider the original and generalized Chaplygin gas model in the presence of monomial potential. The inflationary spectrum perturbation parameters are reformulated and evaluat... |
0809.0052 | Catherine Meusburger | C. Meusburger | Quantum double and $\kappa$-Poincar\'e symmetries in (2+1)-gravity and
Chern-Simons theory | 11 pages, no figures, expanded version of talk at the conference
Theory Canada 4, references and explanations added, typos corrected | Canadian Journal of Physics 87 (2009), 245-250 | 10.1139/P08-076 | pi-qg-87 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the role of Drinfeld doubles and kappa-Poincare symmetries in
quantised (2+1)-gravity and Chern-Simons theory. We discuss the conditions
under which a given Hopf algebra symmetry is compatible with a Chern-Simons
theory and determine this compatibility explicitly for the Drinfeld doubles and
kappa-Poincare ... | [
{
"created": "Sat, 30 Aug 2008 10:38:22 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Sep 2008 11:36:14 GMT",
"version": "v2"
}
] | 2023-06-13 | [
[
"Meusburger",
"C.",
""
]
] | We review the role of Drinfeld doubles and kappa-Poincare symmetries in quantised (2+1)-gravity and Chern-Simons theory. We discuss the conditions under which a given Hopf algebra symmetry is compatible with a Chern-Simons theory and determine this compatibility explicitly for the Drinfeld doubles and kappa-Poincare sy... |
2404.15808 | Sohan Kumar Jha | Sohan Kumar Jha | Observational signature of Lorentz violation in Kalb-Ramond field model
and Bumblebee model: A comprehensive comparative study | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This article is devoted to the comparative study of the effects of the
Lorentz symmetry violation (LV) arising in Kalb-Ramond (KR) and Bumblebee (BM)
field models. We study optical appearance with accretion, Quasinormal modes,
ringdown waveforms, Hawking radiation, and weak gravitational lensing. The
horizon radius, ... | [
{
"created": "Wed, 24 Apr 2024 11:13:28 GMT",
"version": "v1"
}
] | 2024-04-25 | [
[
"Jha",
"Sohan Kumar",
""
]
] | This article is devoted to the comparative study of the effects of the Lorentz symmetry violation (LV) arising in Kalb-Ramond (KR) and Bumblebee (BM) field models. We study optical appearance with accretion, Quasinormal modes, ringdown waveforms, Hawking radiation, and weak gravitational lensing. The horizon radius, ph... |
1710.02403 | Marius Adrian Oancea | Claudio F. Paganini, Marius A. Oancea | Smoothness of the future and past trapped sets in Kerr-Newman-Taub-NUT
spacetimes | 11 pages, 1 figure. This article is intended as a research article,
and supersedes arXiv:1611.06927, which was only intended as lecture notes, so
there is significant overlap of the definitions | null | 10.1088/1361-6382/aaaa5b | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the sets of future/past trapped null geodesics in the exterior
region of a sub-extremal Kerr-Newman-Taub-NUT spacetime. We show that, from the
point of view of any timelike observer outside of such a black hole, trapping
can be understood as two smooth sets of spacelike directions on the celestial
sphere ... | [
{
"created": "Fri, 6 Oct 2017 13:32:50 GMT",
"version": "v1"
}
] | 2018-03-14 | [
[
"Paganini",
"Claudio F.",
""
],
[
"Oancea",
"Marius A.",
""
]
] | We consider the sets of future/past trapped null geodesics in the exterior region of a sub-extremal Kerr-Newman-Taub-NUT spacetime. We show that, from the point of view of any timelike observer outside of such a black hole, trapping can be understood as two smooth sets of spacelike directions on the celestial sphere of... |
gr-qc/0612044 | Kazuhiro Yamamoto | Kazuhiro Yamamoto, Masaki Ando, Keita Kawabe, Kimio Tsubono | A theoretical approach to thermal noise caused by an inhomogeneously
distributed loss -- Physical insight by the advanced modal expansion | 10 pages, 4 figures | Phys.Rev.D75:082002,2007 | 10.1103/PhysRevD.75.082002 | null | gr-qc physics.ins-det | null | We modified the modal expansion, which is the traditional method used to
calculate thermal noise. This advanced modal expansion provides physical
insight about the discrepancy between the actual thermal noise caused by
inhomogeneously distributed loss and the traditional modal expansion. This
discrepancy comes from c... | [
{
"created": "Thu, 7 Dec 2006 13:38:46 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Apr 2007 08:11:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Yamamoto",
"Kazuhiro",
""
],
[
"Ando",
"Masaki",
""
],
[
"Kawabe",
"Keita",
""
],
[
"Tsubono",
"Kimio",
""
]
] | We modified the modal expansion, which is the traditional method used to calculate thermal noise. This advanced modal expansion provides physical insight about the discrepancy between the actual thermal noise caused by inhomogeneously distributed loss and the traditional modal expansion. This discrepancy comes from cor... |
0905.2575 | Gilles Esposito-Farese | Gilles Esposito-Farese | Motion in alternative theories of gravity | 28 pages, 12 figures, lecture given at the "School on Mass" (Orleans,
France, June 2008), uses Springer's "svmult.cls" | Fundam.Theor.Phys.162:461-489,2011 | 10.1007/978-90-481-3015-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although general relativity (GR) passes all present experimental tests with
flying colors, it remains important to study alternative theories of gravity
for several theoretical and phenomenological reasons that we recall in these
lecture notes. The various possible ways of modifying GR are presented, and we
notably s... | [
{
"created": "Fri, 15 May 2009 16:00:04 GMT",
"version": "v1"
}
] | 2011-02-28 | [
[
"Esposito-Farese",
"Gilles",
""
]
] | Although general relativity (GR) passes all present experimental tests with flying colors, it remains important to study alternative theories of gravity for several theoretical and phenomenological reasons that we recall in these lecture notes. The various possible ways of modifying GR are presented, and we notably sho... |
1807.10141 | Daphne O. Klemme | Vincent Moncrief and James Isenberg | Symmetries of Cosmological Cauchy Horizons with Non-Closed Orbits | 55 pages. arXiv admin note: substantial text overlap with
arXiv:0805.1451 | null | 10.1007/s00220-019-03571-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider analytic, vacuum spacetimes that admit compact, non-degenerate
Cauchy horizons. Many years ago we proved that, if the null geodesic generators
of such a horizon were all \textit{closed} curves, then the enveloping
spacetime would necessarily admit a non-trivial, horizon-generating Killing
vector field. Us... | [
{
"created": "Wed, 25 Jul 2018 13:43:41 GMT",
"version": "v1"
}
] | 2019-10-23 | [
[
"Moncrief",
"Vincent",
""
],
[
"Isenberg",
"James",
""
]
] | We consider analytic, vacuum spacetimes that admit compact, non-degenerate Cauchy horizons. Many years ago we proved that, if the null geodesic generators of such a horizon were all \textit{closed} curves, then the enveloping spacetime would necessarily admit a non-trivial, horizon-generating Killing vector field. Usin... |
gr-qc/0605151 | Hakan Andreasson | Hakan Andreasson | On static shells and the Buchdahl inequality for the spherically
symmetric Einstein-Vlasov system | 20 pages, Latex | Commun. Math. Phys. 274:409-425,2007 | 10.1007/s00220-007-0285-4 | null | gr-qc math-ph math.MP | null | In a previous work \cite{An1} matter models such that the energy density
$\rho\geq 0,$ and the radial- and tangential pressures $p\geq 0$ and $q,$
satisfy $p+q\leq\Omega\rho, \Omega\geq 1,$ were considered in the context of
Buchdahl's inequality. It was proved that static shell solutions of the
spherically symmetric ... | [
{
"created": "Wed, 31 May 2006 16:12:07 GMT",
"version": "v1"
}
] | 2011-08-04 | [
[
"Andreasson",
"Hakan",
""
]
] | In a previous work \cite{An1} matter models such that the energy density $\rho\geq 0,$ and the radial- and tangential pressures $p\geq 0$ and $q,$ satisfy $p+q\leq\Omega\rho, \Omega\geq 1,$ were considered in the context of Buchdahl's inequality. It was proved that static shell solutions of the spherically symmetric Ei... |
2003.01589 | Jorge Pullin | Rodolfo Gambini, Saeed Rastgoo, Jorge Pullin | Gravitation in terms of observables 2: the algebra of fundamental
observables | 21 pages, RevTex, 4 figures | null | 10.1088/1361-6382/ab8eb8 | LSU-REL-030320 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous paper, we showed how to use the techniques of the group of
loops to formulate the loop approach to gravity proposed by Mandelstam in the
1960's. Those techniques allow to overcome some of the difficulties that had
been encountered in the earlier treatment. In this approach, gravity is
formulated entirel... | [
{
"created": "Tue, 3 Mar 2020 15:22:15 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Rastgoo",
"Saeed",
""
],
[
"Pullin",
"Jorge",
""
]
] | In a previous paper, we showed how to use the techniques of the group of loops to formulate the loop approach to gravity proposed by Mandelstam in the 1960's. Those techniques allow to overcome some of the difficulties that had been encountered in the earlier treatment. In this approach, gravity is formulated entirely ... |
2006.14349 | Peng Wang | Peng Wang, Houwen Wu, Haitang Yang, and Feiyu Yao | Extended Phase Space Thermodynamics for Black Holes in a Cavity | v1: 20 pages, 9 figures; v2: 21 pages, 9 figures, references added | null | 10.1007/JHEP09(2020)154 | CTP-SCU/2020021 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we extend the phase space of black holes enclosed by a
spherical cavity of radius $r_{B}$ to include $V\equiv4\pi r_{B}^{3}/3$ as a
thermodynamic volume. The thermodynamic behavior of Schwarzschild and
Reissner-Nordstrom (RN) black holes is then investigated in the extended phase
space. In a canonical ... | [
{
"created": "Thu, 25 Jun 2020 12:46:50 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Jul 2020 09:29:05 GMT",
"version": "v2"
}
] | 2020-10-28 | [
[
"Wang",
"Peng",
""
],
[
"Wu",
"Houwen",
""
],
[
"Yang",
"Haitang",
""
],
[
"Yao",
"Feiyu",
""
]
] | In this paper, we extend the phase space of black holes enclosed by a spherical cavity of radius $r_{B}$ to include $V\equiv4\pi r_{B}^{3}/3$ as a thermodynamic volume. The thermodynamic behavior of Schwarzschild and Reissner-Nordstrom (RN) black holes is then investigated in the extended phase space. In a canonical en... |
1507.08225 | Neslihan Oflaz | Ozgur Akarsu, Tekin Dereli, Neslihan Oflaz | Accelerated Expansion of the Universe in a Higher Dimensional Modified
Gravity with Euler-Poincar\'e Terms | 1+19 pages, no figures and tables; matches the version published in
Classical and Quantum Gravity | Classical and Quantum Gravity 32 (2015) 215009 | 10.1088/0264-9381/32/21/215009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A higher dimensional modified gravity theory with an action that includes
dimensionally continued Euler-Poincar\'e forms up to second order in curvatures
is considered. The variational field equations are derived. Matter in the
universe at large scales is modeled by a fluid satisfying an equation of state
with dimens... | [
{
"created": "Wed, 29 Jul 2015 17:09:23 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Oct 2015 18:27:18 GMT",
"version": "v2"
}
] | 2015-10-14 | [
[
"Akarsu",
"Ozgur",
""
],
[
"Dereli",
"Tekin",
""
],
[
"Oflaz",
"Neslihan",
""
]
] | A higher dimensional modified gravity theory with an action that includes dimensionally continued Euler-Poincar\'e forms up to second order in curvatures is considered. The variational field equations are derived. Matter in the universe at large scales is modeled by a fluid satisfying an equation of state with dimensio... |
2312.13075 | Bogeun Gwak | Junsu Park, Bogeun Gwak | Bound on Lyapunov exponent in Kerr-Newman-de Sitter black holes by a
charged particle | 35 pages, 34 figures | null | 10.1007/JHEP04(2024)023 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the bound on the Lyapunov exponents by a charged particle in
Kerr-Newman-de Sitter black holes using analytic and numerical methods. We
determine whether the Lyapunov exponent can exceed the bound by an electrically
charged particle with an angular momentum. Our tests are applied to the de
Sitter space... | [
{
"created": "Wed, 20 Dec 2023 14:56:09 GMT",
"version": "v1"
}
] | 2024-04-08 | [
[
"Park",
"Junsu",
""
],
[
"Gwak",
"Bogeun",
""
]
] | We investigate the bound on the Lyapunov exponents by a charged particle in Kerr-Newman-de Sitter black holes using analytic and numerical methods. We determine whether the Lyapunov exponent can exceed the bound by an electrically charged particle with an angular momentum. Our tests are applied to the de Sitter spaceti... |
gr-qc/9411046 | Karen Brewster | Abhay Ashtekar and Jerzy Lewandowski | Projective Techniques and Functional Integration | 36 pages, latex, no figures, Preprint CGPG/94/10-6 | J.Math.Phys.36:2170-2191,1995 | 10.1063/1.531037 | null | gr-qc hep-th | null | A general framework for integration over certain infinite dimensional spaces
is first developed using projective limits of a projective family of compact
Hausdorff spaces. The procedure is then applied to gauge theories to carry out
integration over the non-linear, infinite dimensional spaces of connections
modulo ga... | [
{
"created": "Thu, 17 Nov 1994 14:58:55 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Lewandowski",
"Jerzy",
""
]
] | A general framework for integration over certain infinite dimensional spaces is first developed using projective limits of a projective family of compact Hausdorff spaces. The procedure is then applied to gauge theories to carry out integration over the non-linear, infinite dimensional spaces of connections modulo gaug... |
1005.2999 | Don Marolf | Donald Marolf | The dangers of extremes | 6 pages, 5 figures, 3rd place in 2010 Gravity Research Foundation
Essay Competition | Gen.Rel.Grav.42:2337-2343,2010 | 10.1007/s10714-010-1027-z | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While extreme black hole spacetimes with smooth horizons are known at the
level of mathematics, we argue that the horizons of physical extreme black
holes are effectively singular. Test particles encounter a singularity the
moment they cross the horizon, and only objects with significant back-reaction
can fall across... | [
{
"created": "Mon, 17 May 2010 19:12:22 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Marolf",
"Donald",
""
]
] | While extreme black hole spacetimes with smooth horizons are known at the level of mathematics, we argue that the horizons of physical extreme black holes are effectively singular. Test particles encounter a singularity the moment they cross the horizon, and only objects with significant back-reaction can fall across a... |
gr-qc/9710101 | Grant J. Mathews | G. J. Mathews, P. Marronetti, J. R. Wilson | Relativistic Studies of Close Neutron Star Binaries | 3 pages, Submitted to Proceesings of 8th Marcel Grossmann Meeting on
General Relativity | null | null | null | gr-qc | null | We discuss (3+1) dimensional general relativistic hydrodynamic simulations of
close neutron star binary systems. The relativistic field equations are solved
at each time slice with a spatial 3-metric chosen to be conformally flat.
Against this solution the hydrodynamic variables and gravitational radiation
are allowe... | [
{
"created": "Tue, 21 Oct 1997 15:38:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mathews",
"G. J.",
""
],
[
"Marronetti",
"P.",
""
],
[
"Wilson",
"J. R.",
""
]
] | We discuss (3+1) dimensional general relativistic hydrodynamic simulations of close neutron star binary systems. The relativistic field equations are solved at each time slice with a spatial 3-metric chosen to be conformally flat. Against this solution the hydrodynamic variables and gravitational radiation are allowed ... |
gr-qc/9702057 | Wang Anzhong | Anzhong Wang, J.F. Villas da Rocha, and N.O. Santos | Gravitational collapse of massless scalar field and radiation fluid | Two figures have been removed, and the text has been re-written. To
appear in Phys. Rev. D | Phys.Rev.D56:7692-7699,1997 | 10.1103/PhysRevD.56.7692 | null | gr-qc | null | Several classes of conformally-flat and spherically symmetric exact solutions
to the Einstein field equations coupled with either a massless scalar field or
a radiation fluid are given, and their main properties are studied. It is found
that some represent the formation of black holes due to the gravitational
collaps... | [
{
"created": "Wed, 26 Feb 1997 19:45:52 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Sep 1997 17:21:45 GMT",
"version": "v2"
}
] | 2009-07-07 | [
[
"Wang",
"Anzhong",
""
],
[
"da Rocha",
"J. F. Villas",
""
],
[
"Santos",
"N. O.",
""
]
] | Several classes of conformally-flat and spherically symmetric exact solutions to the Einstein field equations coupled with either a massless scalar field or a radiation fluid are given, and their main properties are studied. It is found that some represent the formation of black holes due to the gravitational collapse ... |
gr-qc/0405086 | Joachim Moortgat | Joachim Moortgat, Jan Kuijpers | Gravitational waves in magnetized relativistic plasmas | 12 pages, 5 figures; Accepted for publication in Phys. Rev. D | Phys.Rev. D70 (2004) 023001 | 10.1103/PhysRevD.70.023001 | null | gr-qc astro-ph | null | We study the propagation of gravitational waves (GW) in a uniformly
magnetized plasma at arbitrary angles to the magnetic field. No a priori
assumptions are made about the temperature, and we consider both a plasma at
rest and a plasma flowing out at ultra-relativistic velocities. In the 3+1
orthonormal tetrad descri... | [
{
"created": "Mon, 17 May 2004 10:10:03 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Moortgat",
"Joachim",
""
],
[
"Kuijpers",
"Jan",
""
]
] | We study the propagation of gravitational waves (GW) in a uniformly magnetized plasma at arbitrary angles to the magnetic field. No a priori assumptions are made about the temperature, and we consider both a plasma at rest and a plasma flowing out at ultra-relativistic velocities. In the 3+1 orthonormal tetrad descript... |
1609.00745 | Yurii Ignat'ev | Yurii Ignat'ev | Qualitative Analysis and Numerical Simulation of Equations of the
Standard Cosmological Model | 27 pages, 28 figures, 8 references | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the basis of qualitative theory of differential equations it is shown that
dynamic system based on the system of Einstein - Klein - Gordon equations with
regard to Friedman Universe has a stable center corresponding to zero values of
scalar potential and its derivative at infinity. Thus, the cosmological model
bas... | [
{
"created": "Thu, 18 Aug 2016 17:05:44 GMT",
"version": "v1"
}
] | 2016-09-06 | [
[
"Ignat'ev",
"Yurii",
""
]
] | On the basis of qualitative theory of differential equations it is shown that dynamic system based on the system of Einstein - Klein - Gordon equations with regard to Friedman Universe has a stable center corresponding to zero values of scalar potential and its derivative at infinity. Thus, the cosmological model based... |
gr-qc/0006052 | Mohammad Vahid Takook | Mohammad Vahid Takook | A Natural Renormalization of the One-Loop Effective Action for Scalar
Field in Curved Space-time | 5 pages, LaTeX; typos corrected, some details added, reference added | Int.J.Mod.Phys. E14 (2005) 219-224 | null | null | gr-qc | null | It has been shown that the negative norm states necessarily appear in a
covariant quantization of the free minimally coupled scalar field in de Sitter
space [1,2]. In this process ultraviolet and infrared divergences have been
automatically eliminated [3]. A natural renormalization of the one-loop
interacting quantum... | [
{
"created": "Wed, 14 Jun 2000 06:27:43 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2000 07:05:46 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Oct 2000 11:03:07 GMT",
"version": "v3"
},
{
"created": "Mon, 9 May 2005 08:34:27 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Takook",
"Mohammad Vahid",
""
]
] | It has been shown that the negative norm states necessarily appear in a covariant quantization of the free minimally coupled scalar field in de Sitter space [1,2]. In this process ultraviolet and infrared divergences have been automatically eliminated [3]. A natural renormalization of the one-loop interacting quantum f... |
1309.0177 | Joshua S. Schiffrin | Stephen R. Green, Joshua S. Schiffrin, Robert M. Wald | Dynamic and Thermodynamic Stability of Relativistic, Perfect Fluid Stars | 59 pages; v2: a few minor revisions made and several references
added; v3: a few minor changes | Class. Quantum Grav. 31 (2014) 035023 | 10.1088/0264-9381/31/3/035023 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider perfect fluid bodies (stars) in general relativity, characterized
by particle number density and entropy per particle. A star is said to be in
dynamic equilibrium if it is a stationary, axisymmetric solution to the
Einstein-fluid equations with circular flow. We prove that for a star in
dynamic equilibriu... | [
{
"created": "Sun, 1 Sep 2013 03:30:34 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Dec 2013 16:57:50 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Dec 2013 02:47:52 GMT",
"version": "v3"
}
] | 2014-01-22 | [
[
"Green",
"Stephen R.",
""
],
[
"Schiffrin",
"Joshua S.",
""
],
[
"Wald",
"Robert M.",
""
]
] | We consider perfect fluid bodies (stars) in general relativity, characterized by particle number density and entropy per particle. A star is said to be in dynamic equilibrium if it is a stationary, axisymmetric solution to the Einstein-fluid equations with circular flow. We prove that for a star in dynamic equilibrium,... |
0903.0395 | Sam Dolan Dr | Marc Casals, Sam R. Dolan, Adrian C. Ottewill and Barry Wardell | Self-Force Calculations with Matched Expansions and Quasinormal Mode
Sums | Added references, corrected minor typos. 43 pages, 20 figures | Phys.Rev.D79:124043,2009 | 10.1103/PhysRevD.79.124043 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first application of the Poisson-Wiseman-Anderson method of
matched expansions, to compute the self-force acting on a point particle moving
in a curved spacetime. The method uses two expansions for the Green function,
valid in `quasilocal' and `distant past' regimes, which are matched within the
normal... | [
{
"created": "Tue, 3 Mar 2009 20:52:41 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Mar 2009 21:58:03 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Mar 2009 20:38:33 GMT",
"version": "v3"
}
] | 2009-07-09 | [
[
"Casals",
"Marc",
""
],
[
"Dolan",
"Sam R.",
""
],
[
"Ottewill",
"Adrian C.",
""
],
[
"Wardell",
"Barry",
""
]
] | We present the first application of the Poisson-Wiseman-Anderson method of matched expansions, to compute the self-force acting on a point particle moving in a curved spacetime. The method uses two expansions for the Green function, valid in `quasilocal' and `distant past' regimes, which are matched within the normal n... |
gr-qc/0702005 | P. S. Negi | P. S. Negi | The Stability of an Isentropic Model for a Gaseous Relativistic Star | 9 pages (including 1 table); accepted for publication in GRG | Gen.Rel.Grav.39:529-534,2007 | 10.1007/s10714-007-0402-x | null | gr-qc | null | We show that the isentropic subclass of Buchdahl's exact solution for a
gaseous relativistic star is stable and gravitationally bound for all values of
the compactness ratio $u [\equiv (M/R)$, where $M$ is the total mass and $R$ is
the radius of the configuration in geometrized units] in the range, $0 < u \leq
0.20$,... | [
{
"created": "Thu, 1 Feb 2007 11:51:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Negi",
"P. S.",
""
]
] | We show that the isentropic subclass of Buchdahl's exact solution for a gaseous relativistic star is stable and gravitationally bound for all values of the compactness ratio $u [\equiv (M/R)$, where $M$ is the total mass and $R$ is the radius of the configuration in geometrized units] in the range, $0 < u \leq 0.20$, c... |
1410.7132 | Arunava Bhadra Dr. | Tamal Sarkar, Shubhrangshu Ghosh and Arunava Bhadra | Newtonian analogue of Schwarzschild de-Sitter spacetime: Influence on
the local kinematics in galaxies | 25 pages, 12 figures | Physical Review D, Volume 90, Issue 6, id.063008, 2014 | 10.1103/PhysRevD.90.063008 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The late time accelerated expansion of the Universe demands that even in
local galactic-scales it is desirable to study astrophysical phenomena,
particularly relativistic accretion related phenomena in massive galaxies or in
galaxy mergers and the dynamics of the kiloparsecs-scale structure and beyond,
in the local-g... | [
{
"created": "Mon, 27 Oct 2014 06:32:13 GMT",
"version": "v1"
}
] | 2014-10-28 | [
[
"Sarkar",
"Tamal",
""
],
[
"Ghosh",
"Shubhrangshu",
""
],
[
"Bhadra",
"Arunava",
""
]
] | The late time accelerated expansion of the Universe demands that even in local galactic-scales it is desirable to study astrophysical phenomena, particularly relativistic accretion related phenomena in massive galaxies or in galaxy mergers and the dynamics of the kiloparsecs-scale structure and beyond, in the local-gal... |
gr-qc/9703028 | Carlos Barcelo Seron | Carlos Barcelo, Luis J. Garay | Quantum fields in anti-de Sitter wormholes | RevTeX 3.01, 4 pages, no figures | Phys.Rev. D57 (1998) 5291-5294 | 10.1103/PhysRevD.57.5291 | null | gr-qc | null | We study the effects of asymptotically anti-de Sitter wormholes in low-energy
field theory and give a general prescription for obtaining the local effective
interaction terms induced by them. The choice of vacuum for the matter fields
selects a basis of the Hilbert space of anti-de Sitter wormholes whose elements
can... | [
{
"created": "Tue, 11 Mar 1997 13:13:58 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 1998 16:13:38 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Barcelo",
"Carlos",
""
],
[
"Garay",
"Luis J.",
""
]
] | We study the effects of asymptotically anti-de Sitter wormholes in low-energy field theory and give a general prescription for obtaining the local effective interaction terms induced by them. The choice of vacuum for the matter fields selects a basis of the Hilbert space of anti-de Sitter wormholes whose elements can b... |
0712.3775 | Charles Suggs | D. Grumiller and R. Jackiw | Liouville gravity from Einstein gravity | 15 pages, uses diagrams.sty; v2: edited HTML version of abstract,
added reference | null | null | MIT-CTP-3925 | gr-qc hep-th math-ph math.MP | null | We show that Liouville gravity arises as the limit of pure Einstein gravity
in 2+epsilon dimensions as epsilon goes to zero, provided Newton's constant
scales with epsilon. Our procedure - spherical reduction, dualization, limit,
dualizing back - passes several consistency tests: geometric properties,
interactions wi... | [
{
"created": "Fri, 21 Dec 2007 19:09:31 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Dec 2007 18:01:23 GMT",
"version": "v2"
}
] | 2011-11-10 | [
[
"Grumiller",
"D.",
""
],
[
"Jackiw",
"R.",
""
]
] | We show that Liouville gravity arises as the limit of pure Einstein gravity in 2+epsilon dimensions as epsilon goes to zero, provided Newton's constant scales with epsilon. Our procedure - spherical reduction, dualization, limit, dualizing back - passes several consistency tests: geometric properties, interactions with... |
gr-qc/0011077 | Pavel Krtous | Pavel Krtous | Sum-Over-Histories Quantization of Relativistic Particle | 47 pages, 3 figures, LaTeX2e | Class.Quant.Grav. 21 (2004) 1519-1558 | 10.1088/0264-9381/21/6/017 | null | gr-qc | null | Sum-over-histories quantization of particle-like theory in curved space is
discussed. It is reviewed that the propagator satisfies the Schrodinger
equation respective wave equation with a Laplace-like operator. The exact
dependence of the operator on the choice of measure is shown.
Next, modifications needed for a ... | [
{
"created": "Wed, 22 Nov 2000 13:05:53 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Krtous",
"Pavel",
""
]
] | Sum-over-histories quantization of particle-like theory in curved space is discussed. It is reviewed that the propagator satisfies the Schrodinger equation respective wave equation with a Laplace-like operator. The exact dependence of the operator on the choice of measure is shown. Next, modifications needed for a mani... |
1808.00503 | Christian Knoll | Jose Luis Bl\'azquez-Salcedo, Christian Knoll | Solutions of the massive Dirac equation in the near-horizon metric of
the extremal five dimensional Myers-Perry black hole with equal angular
momenta | null | Phys. Rev. D 99, 024026 (2019) | 10.1103/PhysRevD.99.024026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study massive Dirac fields in the background of the near-horizon limit of
the extremal Myers-Perry black hole in five dimensions. We consider the case in
which both angular momenta have equal magnitude. The resulting Dirac equation
can be decoupled into an angular and a radial part. The solution of the angular
par... | [
{
"created": "Wed, 1 Aug 2018 18:39:42 GMT",
"version": "v1"
}
] | 2019-01-23 | [
[
"Blázquez-Salcedo",
"Jose Luis",
""
],
[
"Knoll",
"Christian",
""
]
] | We study massive Dirac fields in the background of the near-horizon limit of the extremal Myers-Perry black hole in five dimensions. We consider the case in which both angular momenta have equal magnitude. The resulting Dirac equation can be decoupled into an angular and a radial part. The solution of the angular part ... |
1604.01837 | Ali \"Ovg\"un | A. \"Ovg\"un | Inflation and Acceleration of the Universe by Nonlinear Magnetic
Monopole Fields | two column, 6 pages, 2 figures, final published version | Eur. Phys. J. C (2017) 77: 105 | 10.1140/epjc/s10052-017-4673-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Despite impressive phenomenological successes, cosmological models are
incomplete without an understanding of what happened at the big bang
singularity. Maxwell electrodynamics, considered as a source of the classical
Einstein field equations, leads to the singular isotropic Friedmann solutions.
In the context of Fri... | [
{
"created": "Thu, 7 Apr 2016 00:24:56 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2016 00:03:26 GMT",
"version": "v2"
},
{
"created": "Sun, 5 Feb 2017 23:50:50 GMT",
"version": "v3"
},
{
"created": "Wed, 8 Feb 2017 11:10:27 GMT",
"version": "v4"
},
{
"crea... | 2017-02-17 | [
[
"Övgün",
"A.",
""
]
] | Despite impressive phenomenological successes, cosmological models are incomplete without an understanding of what happened at the big bang singularity. Maxwell electrodynamics, considered as a source of the classical Einstein field equations, leads to the singular isotropic Friedmann solutions. In the context of Fried... |
2105.04479 | Georgios Antoniou | Georgios Antoniou, Antoine Leh\'ebel, Giulia Ventagli, Thomas P.
Sotiriou | Black hole scalarization with Gauss-Bonnet and Ricci scalar couplings | 8 pages, 8 figures | Phys. Rev. D 104, 044002 (2021) | 10.1103/PhysRevD.104.044002 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spontaneous scalarization is a gravitational phenomenon in which deviations
from general relativity arise once a certain threshold in curvature is
exceeded, while being entirely absent below that threshold. For black holes,
scalarization is known to be triggered by a coupling between a scalar and the
Gauss-Bonnet inv... | [
{
"created": "Mon, 10 May 2021 16:19:48 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Sep 2021 18:34:34 GMT",
"version": "v2"
}
] | 2021-09-08 | [
[
"Antoniou",
"Georgios",
""
],
[
"Lehébel",
"Antoine",
""
],
[
"Ventagli",
"Giulia",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | Spontaneous scalarization is a gravitational phenomenon in which deviations from general relativity arise once a certain threshold in curvature is exceeded, while being entirely absent below that threshold. For black holes, scalarization is known to be triggered by a coupling between a scalar and the Gauss-Bonnet invar... |
2205.02122 | Benrong Mu | Xiaobo Guo, Yuhang Lu, Benrong Mu and Peng Wang | Probing Phase Structure of Black Holes with Lyapunov Exponents | 14 pages, 7 figures | null | 10.1007/JHEP08(2022)153 | CTP-SCU/2022008 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We conjecture that there exists a relationship between Lyapunov exponents and
black hole phase transitions. To support our conjecture, Lyapunov exponents of
the motion of particles and ring strings are calculated for
Reissner-Nordstr\"{o}m-AdS black holes. When a phase transition occurs, the
Lyapunov exponents become... | [
{
"created": "Wed, 4 May 2022 15:23:40 GMT",
"version": "v1"
},
{
"created": "Thu, 26 May 2022 15:00:04 GMT",
"version": "v2"
}
] | 2022-09-07 | [
[
"Guo",
"Xiaobo",
""
],
[
"Lu",
"Yuhang",
""
],
[
"Mu",
"Benrong",
""
],
[
"Wang",
"Peng",
""
]
] | We conjecture that there exists a relationship between Lyapunov exponents and black hole phase transitions. To support our conjecture, Lyapunov exponents of the motion of particles and ring strings are calculated for Reissner-Nordstr\"{o}m-AdS black holes. When a phase transition occurs, the Lyapunov exponents become m... |
gr-qc/9912105 | R. G. Viswakarma | R. G. Vishwakarma (IUCAA) | A study of the angular size-redshift relation for models in which
$\Lambda$ decays as the energy density | LaTex, 15 pages including 2 figures (Revised version appeared in CQG) | Class.Quant.Grav. 17 (2000) 3833-3842 | 10.1088/0264-9381/17/18/317 | null | gr-qc | null | By modifying the Chen and Wu ansatz, we have investigated some Friedmann
models in which $\Lambda$ varies as $\rho$. In order to test the consistency of
the models with observations, we study the angular size - redshift relation for
256 ultracompact radio sources selected by Jackson and Dodgson. The angular
sizes of ... | [
{
"created": "Fri, 24 Dec 1999 11:25:50 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2001 15:31:03 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Vishwakarma",
"R. G.",
"",
"IUCAA"
]
] | By modifying the Chen and Wu ansatz, we have investigated some Friedmann models in which $\Lambda$ varies as $\rho$. In order to test the consistency of the models with observations, we study the angular size - redshift relation for 256 ultracompact radio sources selected by Jackson and Dodgson. The angular sizes of th... |
1704.03708 | Nistor Nicolaevici | Nistor Nicolaevici | Excitation of an inertial Unruh detector in the Minkowski vacuum: a
numerical calculation using spherical modes | 29 pages, 10 figures; submitted to Proceedings of TIM 17 Physics
Conference | null | 10.1063/1.5017428 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the excitation of a finite-length inertial Unruh detector in the
Minkowski vacuum with an adiabatic switch on of the interaction in the infinite
past and a sudden switch off at finite times, and obtain the excitation
probability via a numerical calculation using the expansion of the quantum
field in spher... | [
{
"created": "Wed, 12 Apr 2017 11:16:39 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Apr 2017 20:29:32 GMT",
"version": "v2"
}
] | 2018-01-17 | [
[
"Nicolaevici",
"Nistor",
""
]
] | We consider the excitation of a finite-length inertial Unruh detector in the Minkowski vacuum with an adiabatic switch on of the interaction in the infinite past and a sudden switch off at finite times, and obtain the excitation probability via a numerical calculation using the expansion of the quantum field in spheric... |
gr-qc/9806014 | Gabrielle Allen | Gabrielle Allen, Karen Camarda, Edward Seidel | Evolution of Distorted Black Holes: A Perturbative Approach | 20 pages, 10 figures, Submitted to Phys. Rev. D | null | null | null | gr-qc | null | We consider a series of distorted black hole initial data sets, and develop
techniques to evolve them using the linearized equations of motion for the
gravitational wave perturbations on a Schwarzschild background. We apply this
to 2D and 3D distorted black hole spacetimes. In 2D, waveforms for different
modes of the... | [
{
"created": "Wed, 3 Jun 1998 16:07:07 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jun 1998 12:07:56 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Allen",
"Gabrielle",
""
],
[
"Camarda",
"Karen",
""
],
[
"Seidel",
"Edward",
""
]
] | We consider a series of distorted black hole initial data sets, and develop techniques to evolve them using the linearized equations of motion for the gravitational wave perturbations on a Schwarzschild background. We apply this to 2D and 3D distorted black hole spacetimes. In 2D, waveforms for different modes of the r... |
1008.4805 | Giacomo Mauro D'Ariano | Giacomo Mauro D'Ariano and Alessandro Tosini | Space-time and special relativity from causal networks | 4 pages and 4 figures | null | null | null | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how the Minkowskian space-time emerges from a topologically
homogeneous causal network, presenting a simple analytical derivation of the
Lorentz transformations, with metric as pure event-counting. The derivation
holds generally for d=1 space dimension, however, it can be extended to d>1 for
special causal ne... | [
{
"created": "Fri, 27 Aug 2010 20:46:15 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Sep 2010 06:15:27 GMT",
"version": "v2"
}
] | 2010-09-27 | [
[
"D'Ariano",
"Giacomo Mauro",
""
],
[
"Tosini",
"Alessandro",
""
]
] | We show how the Minkowskian space-time emerges from a topologically homogeneous causal network, presenting a simple analytical derivation of the Lorentz transformations, with metric as pure event-counting. The derivation holds generally for d=1 space dimension, however, it can be extended to d>1 for special causal netw... |
gr-qc/0610037 | Francesco Cianfrani dr | Francesco Cianfrani, Giovanni Montani | The electro-weak model as a phenomenological issue of multidimensions | 3 pages, proceedings of the XI Marcel Grossmann meeting on
Relativistic Astrophysics, July 23-29, 2006, Berlin | null | null | null | gr-qc | null | We consider Kaluza-Klein theories as candidates for the unification of
gravity and the electro-weak model. In particular, we fix how to reproduce
geometrically the interaction between fermions and gauge bosons, in the low
energy limit.
| [
{
"created": "Mon, 9 Oct 2006 15:57:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cianfrani",
"Francesco",
""
],
[
"Montani",
"Giovanni",
""
]
] | We consider Kaluza-Klein theories as candidates for the unification of gravity and the electro-weak model. In particular, we fix how to reproduce geometrically the interaction between fermions and gauge bosons, in the low energy limit. |
1711.06209 | Andrea Giugno | Andrea Giugno, Andrea Giusti, Alexis Helou | Horizon quantum fuzziness for non-singular black holes | 17 pages, no figures | null | 10.1140/epjc/s10052-018-5715-2 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the extent of quantum gravitational effects in the internal region
of non-singular, Hayward-like solutions of Einstein's field equations according
to the formalism known as Horizon Quantum Mechanics. We grant a microscopic
description to the horizon by considering a huge number of soft, off-shell
gravitons, ... | [
{
"created": "Thu, 16 Nov 2017 17:30:16 GMT",
"version": "v1"
}
] | 2018-04-04 | [
[
"Giugno",
"Andrea",
""
],
[
"Giusti",
"Andrea",
""
],
[
"Helou",
"Alexis",
""
]
] | We study the extent of quantum gravitational effects in the internal region of non-singular, Hayward-like solutions of Einstein's field equations according to the formalism known as Horizon Quantum Mechanics. We grant a microscopic description to the horizon by considering a huge number of soft, off-shell gravitons, wh... |
1407.2862 | Andrzej Krasi\'nski | Andrzej Krasi\'nski | Mimicking acceleration in the constant-bang-time Lema\^{\i}tre -- Tolman
model: Shell crossings, density distributions and light cones | 13 pages, 13 figures. New secs. X and XI added, secs. I, II, V, IX
and the old XI(now XIII) re-edited to accommodate the new material, Figs. 3,
8 and old 11 (now 10) redrawn, old Fig. 10 removed. The extensions were
inspired by the referee. New text matches that accepted for Phys. Rev. D | Phys. Rev. D 90, 064021 (2014) | 10.1103/PhysRevD.90.064021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Lema\^{\i}tre -- Tolman model with $\Lambda = 0$ and constant bang time
that imitates the luminosity distance -- redshift relation of the $\Lambda$CDM
model using the energy function $E$ alone contains shell crossings. In this
paper, the location in spacetime and the consequences of existence of the
shell-crossin... | [
{
"created": "Thu, 10 Jul 2014 16:50:53 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Jul 2014 17:07:22 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Sep 2014 11:39:56 GMT",
"version": "v3"
}
] | 2014-09-17 | [
[
"Krasiński",
"Andrzej",
""
]
] | The Lema\^{\i}tre -- Tolman model with $\Lambda = 0$ and constant bang time that imitates the luminosity distance -- redshift relation of the $\Lambda$CDM model using the energy function $E$ alone contains shell crossings. In this paper, the location in spacetime and the consequences of existence of the shell-crossing ... |
2212.08647 | Franco Fiorini | Franco Fiorini | Chronology protection in $f(T)$ gravity: the case of Gott's pair of
moving cosmic strings | 6 pages, 2 figures | Universe (2024) 10, 52 | 10.3390/universe10010052 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a consequence of the spacetime structure, defined by the tetrad field
instead of the metric tensor alone, $f(T)$ gravity seems to harbor its own
chronology protection agency. When Gott's pair of moving cosmic strings is
considered, it is shown that the requirement of having a global parallelization
-- i.e. a globa... | [
{
"created": "Fri, 16 Dec 2022 18:47:14 GMT",
"version": "v1"
}
] | 2024-01-24 | [
[
"Fiorini",
"Franco",
""
]
] | As a consequence of the spacetime structure, defined by the tetrad field instead of the metric tensor alone, $f(T)$ gravity seems to harbor its own chronology protection agency. When Gott's pair of moving cosmic strings is considered, it is shown that the requirement of having a global parallelization -- i.e. a global ... |
1505.05329 | Cosimo Bambi | Nan Lin, Zilong Li, Jake Arthur, Rachel Asquith, Cosimo Bambi | Testing SgrA$^*$ with the spectrum of its accretion structure | 1+11 pages, 5 figures. v2: refereed version. Corrected a problem in
the code and found somewhat different conclusions | JCAP 1509:038,2015 | 10.1088/1475-7516/2015/09/038 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | SgrA$^*$ is the supermassive black hole candidate at the center of the Galaxy
and an ideal laboratory to test general relativity. Following previous work by
other authors, we use the Polish doughnut model to describe an optically thin
and constant angular momentum ion torus in hydrodynamical equilibrium and model
the... | [
{
"created": "Wed, 20 May 2015 11:46:45 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Sep 2015 15:07:55 GMT",
"version": "v2"
}
] | 2015-12-02 | [
[
"Lin",
"Nan",
""
],
[
"Li",
"Zilong",
""
],
[
"Arthur",
"Jake",
""
],
[
"Asquith",
"Rachel",
""
],
[
"Bambi",
"Cosimo",
""
]
] | SgrA$^*$ is the supermassive black hole candidate at the center of the Galaxy and an ideal laboratory to test general relativity. Following previous work by other authors, we use the Polish doughnut model to describe an optically thin and constant angular momentum ion torus in hydrodynamical equilibrium and model the a... |
1807.06353 | Andronikos Paliathanasis | Michael Tsamparlis and Andronikos Paliathanasis | The generic model of General Relativity | 55 pages, no figures | Arab. J. Math. 8, 201 (2019) | 10.1007/s40065-019-0239-7 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a generic spacetime model in General Relativity which can be used
to build any gravitational model within General Relativity. The generic model
uses two types of assumptions: (a) Geometric assumptions additional to the
inherent geometric identities of the Riemannian geometry of spacetime and (b)
Assumption... | [
{
"created": "Tue, 17 Jul 2018 11:27:27 GMT",
"version": "v1"
}
] | 2021-06-15 | [
[
"Tsamparlis",
"Michael",
""
],
[
"Paliathanasis",
"Andronikos",
""
]
] | We develop a generic spacetime model in General Relativity which can be used to build any gravitational model within General Relativity. The generic model uses two types of assumptions: (a) Geometric assumptions additional to the inherent geometric identities of the Riemannian geometry of spacetime and (b) Assumptions ... |
0904.0781 | Sunil Maharaj | S. Thirukkanesh, S. D. Maharaj | Charged relativistic spheres with generalized potentials | 22 pages, To appear in Math. Meth. Appl. Sci | Math.Methods Appl.Sci.32:684-701,2009 | 10.1002/mma.1060 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new class of exact solutions of the Einstein-Maxwell system is found in
closed form. This is achieved by choosing a generalised form for one of the
gravitational potentials and a particular form for the electric field
intensity. For specific values of the parameters it is possible to write the
new series solutions ... | [
{
"created": "Sun, 5 Apr 2009 14:26:09 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Thirukkanesh",
"S.",
""
],
[
"Maharaj",
"S. D.",
""
]
] | A new class of exact solutions of the Einstein-Maxwell system is found in closed form. This is achieved by choosing a generalised form for one of the gravitational potentials and a particular form for the electric field intensity. For specific values of the parameters it is possible to write the new series solutions in... |
2407.13583 | Martin Bojowald | Martin Bojowald and Erick I. Duque | Emergent modified gravity: Polarized Gowdy model on a torus | 55 pages, two figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New covariant theories of emergent modified gravity exist not only in
spherically symmetric models, as previously found, but also in polarized Gowdy
systems that have a local propagating degree of freedom. Several explicit
versions are derived here, depending on various modification functions. These
models do not hav... | [
{
"created": "Thu, 18 Jul 2024 15:25:33 GMT",
"version": "v1"
}
] | 2024-07-19 | [
[
"Bojowald",
"Martin",
""
],
[
"Duque",
"Erick I.",
""
]
] | New covariant theories of emergent modified gravity exist not only in spherically symmetric models, as previously found, but also in polarized Gowdy systems that have a local propagating degree of freedom. Several explicit versions are derived here, depending on various modification functions. These models do not have ... |
2109.08921 | Yong-Ming Huang | Yong-Ming Huang, Yu Tian and Xiao-Ning Wu | Collapsing dust thin shells in Einstein-Gauss-Bonnet gravity | null | The European Physical Journal C volume 82, Article number: 183
(2022) | 10.1140/epjc/s10052-022-10075-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate gravitational collapse of a spherically symmetric thin shell
in the Einstein-Gauss-Bonnet (EGB) gravity. Under the recently proposed 4D
limit, we find that the collapsing shell will be bounced back at a small
radius, without forming a singularity. This bouncing behavior is similar to
those of a test pa... | [
{
"created": "Sat, 18 Sep 2021 12:40:44 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Mar 2022 09:03:28 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Mar 2022 03:44:15 GMT",
"version": "v3"
}
] | 2022-03-09 | [
[
"Huang",
"Yong-Ming",
""
],
[
"Tian",
"Yu",
""
],
[
"Wu",
"Xiao-Ning",
""
]
] | We investigate gravitational collapse of a spherically symmetric thin shell in the Einstein-Gauss-Bonnet (EGB) gravity. Under the recently proposed 4D limit, we find that the collapsing shell will be bounced back at a small radius, without forming a singularity. This bouncing behavior is similar to those of a test part... |
1912.09340 | Lukas Weih | Lukas R. Weih, Matthias Hanauske, Luciano Rezzolla | Postmerger Gravitational-Wave Signatures of Phase Transitions in Binary
Mergers | 6 pages, 4 figures, includes supplemental material, matches version
accepted to PRL | Phys. Rev. Lett. 124, 171103 (2020) | 10.1103/PhysRevLett.124.171103 | null | gr-qc astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the first detection of gravitational waves from a binary system of
neutron stars, GW170817, a new window was opened to study the properties of
matter at and above nuclear-saturation density. Reaching densities a few times
that of nuclear matter and temperatures up to $100\,\rm{MeV}$, such mergers
also represent ... | [
{
"created": "Thu, 19 Dec 2019 16:23:15 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2020 16:06:43 GMT",
"version": "v2"
}
] | 2020-05-01 | [
[
"Weih",
"Lukas R.",
""
],
[
"Hanauske",
"Matthias",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | With the first detection of gravitational waves from a binary system of neutron stars, GW170817, a new window was opened to study the properties of matter at and above nuclear-saturation density. Reaching densities a few times that of nuclear matter and temperatures up to $100\,\rm{MeV}$, such mergers also represent po... |
1301.4486 | Wojciech Zakrzewski | P.C. Stichel and W.J. Zakrzewski | Nonstandard approach to gravity for the dark sector of the Universe | null | null | 10.3390/e15020559 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize the present state of research on the darkon fuid as a model for
the dark sector of the Universe. Nonrelativistic massless particles are
introduced as a realization of the Galilei group in an enlarged phase space.
The additional degrees of freedom allow for a nonstandard, minimal coupling to
gravity respe... | [
{
"created": "Fri, 18 Jan 2013 20:33:38 GMT",
"version": "v1"
}
] | 2016-11-04 | [
[
"Stichel",
"P. C.",
""
],
[
"Zakrzewski",
"W. J.",
""
]
] | We summarize the present state of research on the darkon fuid as a model for the dark sector of the Universe. Nonrelativistic massless particles are introduced as a realization of the Galilei group in an enlarged phase space. The additional degrees of freedom allow for a nonstandard, minimal coupling to gravity respect... |
1211.0222 | Jansen Formiga | J. B. Formiga | On the accelerated observer's proper coordinates and the rigid motion
problem in Minkowski spacetime | The text has been changed in order to change the focus of the paper.
The focus is now on the problem of rigid motion in Minkowski spacetime and
the role played by accelerated observers. This paper has been published in
volume 43 of the Brazilian Journal of Physics | null | 10.1007/s13538-013-0157-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Physicists have been interested in accelerated observers for quite some time.
Since the advent of special relativity, many authors have tried to understand
these observers in the framework of Minkowski spacetime. One of the most
important issues related to these observers is the problematic definition of
rigid motion... | [
{
"created": "Thu, 1 Nov 2012 16:47:54 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Aug 2013 18:00:26 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Oct 2013 11:58:53 GMT",
"version": "v3"
}
] | 2013-10-04 | [
[
"Formiga",
"J. B.",
""
]
] | Physicists have been interested in accelerated observers for quite some time. Since the advent of special relativity, many authors have tried to understand these observers in the framework of Minkowski spacetime. One of the most important issues related to these observers is the problematic definition of rigid motion. ... |
1005.4569 | Alan Pavan Bendasoli | A. B. Pavan | Analysis of geometries with closed timelike curves | PhD thesis (in Portuguese), Advisor: Prof. Dr. Elcio Abdalla, 155
pages, 31 figures, May 2010 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work deals with the analysis of cylindrically symmetric and stationary
space-times $\mathcal{C}_{t}$ with closed timelike curves. The equation of
motion describing the evolution of a massive scalar field in a
$\mathcal{C}_{t}$ space-time is obtained. A class of space-times with closed
timelike curves describing ... | [
{
"created": "Tue, 25 May 2010 13:23:38 GMT",
"version": "v1"
}
] | 2010-05-26 | [
[
"Pavan",
"A. B.",
""
]
] | This work deals with the analysis of cylindrically symmetric and stationary space-times $\mathcal{C}_{t}$ with closed timelike curves. The equation of motion describing the evolution of a massive scalar field in a $\mathcal{C}_{t}$ space-time is obtained. A class of space-times with closed timelike curves describing co... |
1210.3629 | Robert Mann | S. H. Hendi, R. B. Mann, N. Riazi, and B. Eslam Panah | Eguchi-Hanson like space-times in F(R) gravity | Latex, 20 pages, 6 figures | Phys. Rev. D86 104034 (2012) | 10.1103/PhysRevD.86.104034 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a model of $F(R)$ gravity in which exponential and power
corrections to Einstein-$\Lambda$ gravity are included. We show that this model
has 4-dimensional Eguchi-Hanson type instanton solutions in Euclidean space. We
then seek solutions to the five dimensional equations for which space-time
contains a hyp... | [
{
"created": "Fri, 12 Oct 2012 20:15:11 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Hendi",
"S. H.",
""
],
[
"Mann",
"R. B.",
""
],
[
"Riazi",
"N.",
""
],
[
"Panah",
"B. Eslam",
""
]
] | We consider a model of $F(R)$ gravity in which exponential and power corrections to Einstein-$\Lambda$ gravity are included. We show that this model has 4-dimensional Eguchi-Hanson type instanton solutions in Euclidean space. We then seek solutions to the five dimensional equations for which space-time contains a hyper... |
1409.0760 | Amare Abebe | Amare Abebe | Breaking the cosmological background degeneracy by two-fluid
perturbations in f(R) gravity | 17 pages, 19 figures | Int. J. Mod. Phys. D Vol. 24, No. 7 (2015) 1550053 | 10.1142/S0218271815500534 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the exact solutions of f(R) theories of gravity in the presence of
different forms of matter exactly mimics the LCDM solution of general
relativity at the background level. In this work we study the evolution of
scalar cosmological perturbations in the covariant and gauge-invariant
formalism and show that alth... | [
{
"created": "Tue, 2 Sep 2014 15:37:29 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Sep 2014 18:13:44 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Apr 2015 12:03:29 GMT",
"version": "v3"
}
] | 2015-04-28 | [
[
"Abebe",
"Amare",
""
]
] | One of the exact solutions of f(R) theories of gravity in the presence of different forms of matter exactly mimics the LCDM solution of general relativity at the background level. In this work we study the evolution of scalar cosmological perturbations in the covariant and gauge-invariant formalism and show that althou... |
gr-qc/0211065 | David Delphenich | D. H. Delphenich | The Geometric Origin of the Madelung Potential | 19 pages | null | null | null | gr-qc | null | Madelung's hydrodynamical forms of the Schrodinger equation and the
Klein-Gordon equation are presented. The physical nature of the quantum
potential is explored. It is demonstrated that the geometrical origin of the
quantum potential is in the scalar curvature of the of the metric that defines
the kinetic energy den... | [
{
"created": "Tue, 19 Nov 2002 16:10:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Delphenich",
"D. H.",
""
]
] | Madelung's hydrodynamical forms of the Schrodinger equation and the Klein-Gordon equation are presented. The physical nature of the quantum potential is explored. It is demonstrated that the geometrical origin of the quantum potential is in the scalar curvature of the of the metric that defines the kinetic energy densi... |
gr-qc/0207064 | Marcelo Alves | M.Alves | String Cosmology in the Jackiw-Telteiboim Model with Quantum Corrections | 8 pages, no figures | Class.Quant.Grav. 19 (2002) 4505-4510 | 10.1088/0264-9381/19/17/302 | null | gr-qc hep-th | null | This note deals with the possibility of non-trivial cosmological solutions
given by quantum corrections in the framework of the Jackiw-Telteiboim model to
the bidimensional gravity. The resulting model shows that the quantum
corrections transform, in some cases, the classical solution into a more
interesting one with... | [
{
"created": "Wed, 17 Jul 2002 18:39:47 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Alves",
"M.",
""
]
] | This note deals with the possibility of non-trivial cosmological solutions given by quantum corrections in the framework of the Jackiw-Telteiboim model to the bidimensional gravity. The resulting model shows that the quantum corrections transform, in some cases, the classical solution into a more interesting one with i... |
2005.08338 | Grigoris Panotopoulos | Grigoris Panotopoulos | Quasinormal modes of charged black holes in higher-dimensional
Einstein-power-Maxwell theory | Reference added. It belongs to Axioms' Special Issue: "Theory and
Mathematical Aspects of Black Holes". It contains material from
arXiv:1711.04146, arXiv:1904.10847, arXiv:1910.08538 | Axioms 2020, 9(1), 33 | 10.3390/axioms9010033 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the quasinormal frequencies for scalar perturbations of charged
black holes in five-dimensional Einstein-power-Maxwell theory. The impact on
the spectrum of the electric charge of the black holes, of the angular degree,
of the overtone number, and of the mass of the test scalar field is
investigated in det... | [
{
"created": "Sun, 17 May 2020 18:47:25 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Jun 2020 16:02:29 GMT",
"version": "v2"
}
] | 2020-07-02 | [
[
"Panotopoulos",
"Grigoris",
""
]
] | We compute the quasinormal frequencies for scalar perturbations of charged black holes in five-dimensional Einstein-power-Maxwell theory. The impact on the spectrum of the electric charge of the black holes, of the angular degree, of the overtone number, and of the mass of the test scalar field is investigated in detai... |
2006.14570 | Yacine Ali-Ha\"imoud | Yacine Ali-Ha\"imoud, Tristan L. Smith and Chiara M. F. Mingarelli | Fisher formalism for anisotropic gravitational-wave background searches
with pulsar timing arrays | Version accepted for publication in PRD after minor changes.
Follow-up paper on applications: arXiv:2010.13958 | Phys. Rev. D 102, 122005 (2020) | 10.1103/PhysRevD.102.122005 | null | gr-qc astro-ph.IM physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pulsar timing arrays (PTAs) are currently the only experiments directly
sensitive to gravitational waves with decade-long periods. Within the next five
to ten years, PTAs are expected to detect the stochastic gravitational-wave
background (SGWB) collectively sourced by inspiralling supermassive black hole
binaries. I... | [
{
"created": "Thu, 25 Jun 2020 17:16:20 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Nov 2020 19:43:22 GMT",
"version": "v2"
}
] | 2021-01-04 | [
[
"Ali-Haïmoud",
"Yacine",
""
],
[
"Smith",
"Tristan L.",
""
],
[
"Mingarelli",
"Chiara M. F.",
""
]
] | Pulsar timing arrays (PTAs) are currently the only experiments directly sensitive to gravitational waves with decade-long periods. Within the next five to ten years, PTAs are expected to detect the stochastic gravitational-wave background (SGWB) collectively sourced by inspiralling supermassive black hole binaries. It ... |
1608.07806 | Vasilis Oikonomou | S. Nojiri, S.D. Odintsov, V.K. Oikonomou | Viable Mimetic Completion of Unified Inflation-Dark Energy Evolution in
Modified Gravity | PRD Accepted | null | 10.1103/PhysRevD.94.104050 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we demonstrate that a unified description of early and
late-time acceleration is possible in the context of mimetic $F(R)$ gravity. We
study the inflationary era in detail and demonstrate that it can be realized
even in mimetic $F(R)$ gravity where traditional $F(R)$ gravity fails to
describe the infla... | [
{
"created": "Sun, 28 Aug 2016 13:02:18 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Nov 2016 13:16:57 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"Nojiri",
"S.",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | In this paper, we demonstrate that a unified description of early and late-time acceleration is possible in the context of mimetic $F(R)$ gravity. We study the inflationary era in detail and demonstrate that it can be realized even in mimetic $F(R)$ gravity where traditional $F(R)$ gravity fails to describe the inflati... |
1711.00585 | Igor Khavkine | Igor Khavkine | Explicit triangular decoupling of the separated vector wave equation on
Schwarzschild into scalar Regge-Wheeler equations | v2: improved notation, fixed some inconsistent formulas; close to
published version, with minor further corrections. v1: 20 pages, no figures;
contribution to the proceedings of the workshop "Non-regular spacetime
geometry" held in Florence, Italy, 20-22 Jun 2017 | J. Phys.: Conf. Ser. 968, 012006 (2018) | 10.1088/1742-6596/968/1/012006 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We consider the vector wave equation on the Schwarzschild spacetime, which
can be considered as coming from the harmonic (or Lorenz) gauge fixed Maxwell
equations. After a separation of variables, the radial mode equations form a
complicated system of coupled linear ODEs. We outline a precise abstract
strategy to dec... | [
{
"created": "Thu, 2 Nov 2017 01:26:42 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Apr 2018 14:14:44 GMT",
"version": "v2"
}
] | 2018-04-11 | [
[
"Khavkine",
"Igor",
""
]
] | We consider the vector wave equation on the Schwarzschild spacetime, which can be considered as coming from the harmonic (or Lorenz) gauge fixed Maxwell equations. After a separation of variables, the radial mode equations form a complicated system of coupled linear ODEs. We outline a precise abstract strategy to decou... |
2302.01564 | Hrishikesh Chakrabarty | Hrishikesh Chakrabarty, Auttakit Chatrabhuti, Daniele Malafarina,
Bhuddhanubhap Silasan, Takol Tangphati | Effects of gravitational lensing by Kaluza-Klein black holes on neutrino
oscillations | 13 pages, 6 figures, matches published version | JCAP 08 (2023) 018 | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We study gravitational lensing of neutrinos in a Kaluza-Klein black hole
spacetime and compare the oscillation probabilities of neutrinos with the case
of lensing by black holes in General Relativity. We show that measuring
neutrino oscillations in curved spacetimes may allow us to distinguish the two
kinds of black ... | [
{
"created": "Fri, 3 Feb 2023 06:24:34 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Aug 2023 09:53:10 GMT",
"version": "v2"
}
] | 2023-08-17 | [
[
"Chakrabarty",
"Hrishikesh",
""
],
[
"Chatrabhuti",
"Auttakit",
""
],
[
"Malafarina",
"Daniele",
""
],
[
"Silasan",
"Bhuddhanubhap",
""
],
[
"Tangphati",
"Takol",
""
]
] | We study gravitational lensing of neutrinos in a Kaluza-Klein black hole spacetime and compare the oscillation probabilities of neutrinos with the case of lensing by black holes in General Relativity. We show that measuring neutrino oscillations in curved spacetimes may allow us to distinguish the two kinds of black ho... |
2004.13693 | Francisco Cabral | Francisco Cabral, Francisco S. N. Lobo, Diego Rubiera-Garcia | The cosmological principle in theories with torsion: The case of
Einstein-Cartan-Dirac-Maxwell gravity | V2: 11 pages, published version | JCAP 10 (2020) 057 | 10.1088/1475-7516/2020/10/057 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the implementation of the cosmological principle, that is, the
assumption of homogeneity and isotropy in the spatial distribution of matter in
the Universe, within the context of Einstein-Cartan theory including minimal
couplings of both Dirac and Maxwell fields to torsion. This theory gives rise
to new ph... | [
{
"created": "Tue, 28 Apr 2020 17:49:46 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Nov 2020 23:59:15 GMT",
"version": "v2"
}
] | 2020-11-03 | [
[
"Cabral",
"Francisco",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Rubiera-Garcia",
"Diego",
""
]
] | We address the implementation of the cosmological principle, that is, the assumption of homogeneity and isotropy in the spatial distribution of matter in the Universe, within the context of Einstein-Cartan theory including minimal couplings of both Dirac and Maxwell fields to torsion. This theory gives rise to new phys... |
2208.01400 | Muhammad Sharif | M. Sharif and Saba Naz | Impact of Charge on Gravastars in $f(\mathfrak{R},\mathcal{T}^{2})$
Gravity | 20 pages, 4 figures | Mod. Phys. Lett. A 37(2022)2250065 | 10.1142/S0217732322500651 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper studies the influence of charge on a compact stellar structure
also regarded as vacuum condensate star in the background of
$f(\mathfrak{R},\mathcal{T}^{2})$ gravity. This object is considered the
alternate of black hole whose structure involves three distinct regions, i.e.,
interior, exterior and thin-she... | [
{
"created": "Mon, 1 Aug 2022 07:27:06 GMT",
"version": "v1"
}
] | 2022-08-10 | [
[
"Sharif",
"M.",
""
],
[
"Naz",
"Saba",
""
]
] | This paper studies the influence of charge on a compact stellar structure also regarded as vacuum condensate star in the background of $f(\mathfrak{R},\mathcal{T}^{2})$ gravity. This object is considered the alternate of black hole whose structure involves three distinct regions, i.e., interior, exterior and thin-shell... |
1010.1367 | Christian Boehmer | Christian G. Boehmer, Atifah Mussa | Charged perfect fluids in the presence of a cosmological constant | 14 pages, 2 figures; revised version, one subsection removed, minor
changes throughout the text | Gen.Rel.Grav.43:3033-3046,2011 | 10.1007/s10714-011-1223-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the static and spherically symmetric field equations of general
relativity for charged perfect fluid spheres in the presence of a cosmological
constant. Following work by Florides (1983) we find new exact solutions of the
field equations, and discuss their mass radius ratios. These solutions, for
instance... | [
{
"created": "Thu, 7 Oct 2010 08:30:26 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Aug 2011 18:35:24 GMT",
"version": "v2"
}
] | 2011-10-19 | [
[
"Boehmer",
"Christian G.",
""
],
[
"Mussa",
"Atifah",
""
]
] | We consider the static and spherically symmetric field equations of general relativity for charged perfect fluid spheres in the presence of a cosmological constant. Following work by Florides (1983) we find new exact solutions of the field equations, and discuss their mass radius ratios. These solutions, for instance, ... |
1311.5931 | Francesco Pannarale | Francesco Pannarale | Black hole remnant of black hole-neutron star coalescing binaries with
arbitrary black hole spin | 11 pages, 2 figures, 3 tables | Phys. Rev. D 89, 044045 (2014) | 10.1103/PhysRevD.89.044045 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model for determining the dimensionless spin parameter and mass of the
black hole remnant of black hole-neutron star mergers with arbitrary initial
black hole spin angular momentum, binary mass ratio, and neutron star mass and
cold equation of state is formulated. Tests against numerical-relativity
results are carr... | [
{
"created": "Fri, 22 Nov 2013 23:56:28 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Mar 2014 14:29:57 GMT",
"version": "v2"
}
] | 2014-03-11 | [
[
"Pannarale",
"Francesco",
""
]
] | A model for determining the dimensionless spin parameter and mass of the black hole remnant of black hole-neutron star mergers with arbitrary initial black hole spin angular momentum, binary mass ratio, and neutron star mass and cold equation of state is formulated. Tests against numerical-relativity results are carrie... |
gr-qc/0103017 | Yakov Itin | Yakov Itin | Conserved currents for general teleparallel models | 22 pages, 3 figures | null | 10.1142/S0217751X02011928 | null | gr-qc | null | The obstruction for the existence of an energy momentum tensor for the
gravitational field is connected with differential-geometric features of the
Riemannian manifold. It has not to be valid for alternative geometrical
structures. In this article a general 3-parameter class of teleparallel models
is considered. The ... | [
{
"created": "Tue, 6 Mar 2001 17:21:12 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Itin",
"Yakov",
""
]
] | The obstruction for the existence of an energy momentum tensor for the gravitational field is connected with differential-geometric features of the Riemannian manifold. It has not to be valid for alternative geometrical structures. In this article a general 3-parameter class of teleparallel models is considered. The fi... |
gr-qc/9403023 | Osamu Yasuda 0426-77-1111x3376 | Osamu Yasuda | A test of a kind of the equivalence principle by long-baseline
neutrino-oscillation experiments | LaTeX, 7 pages and 5 figures appended as uuencoded PostScript files,
TMUP-HEL-9404 | null | null | null | gr-qc | null | Possible breakdown of the universality of the gravitational couplings to
different neutrino flavors can be tested in long-baseline neutrino-oscillation
experiments, such as a proposed experiment at SOUDAN 2 or one at the DUMAND
project. Such a breakdown could be detected with sensitivity to the order of
$10^{-14}$ or... | [
{
"created": "Fri, 11 Mar 1994 03:35:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yasuda",
"Osamu",
""
]
] | Possible breakdown of the universality of the gravitational couplings to different neutrino flavors can be tested in long-baseline neutrino-oscillation experiments, such as a proposed experiment at SOUDAN 2 or one at the DUMAND project. Such a breakdown could be detected with sensitivity to the order of $10^{-14}$ or $... |
2208.03661 | Yong Song | Yong Song and Chuanyu Zhang | Quasi-local studies of the particle surfaces and their stability in
general spacetimes | 15 pages, accepted for publication in European Physical Journal C | null | 10.1140/epjc/s10052-022-11143-w | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, enlightened by the definition of the photon surface given by
Claudel, Virbhadra and Ellis, we give a quasi-local definition of the particle
surface. From this definition, one can study the evolution of the circular
orbits in general spacetime. Especially, we pointed out that this definition
can be used... | [
{
"created": "Sun, 7 Aug 2022 07:52:36 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jan 2023 06:10:24 GMT",
"version": "v2"
}
] | 2023-02-08 | [
[
"Song",
"Yong",
""
],
[
"Zhang",
"Chuanyu",
""
]
] | In this paper, enlightened by the definition of the photon surface given by Claudel, Virbhadra and Ellis, we give a quasi-local definition of the particle surface. From this definition, one can study the evolution of the circular orbits in general spacetime. Especially, we pointed out that this definition can be used t... |
2312.00769 | Kam To Billy Sievers | Kam To Billy Sievers, Liam Newhook, Sarah Muth, Ivan Booth, Robie A.
Hennigar, Hari K. Kunduri | Marginally Outer Trapped Tori in Black Hole Spacetimes | 14 pages, 16 figures | null | 10.1103/PhysRevD.109.124023 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | During a binary black hole merger, multiple intermediary marginally outer
trapped tubes connect the initial pair of apparent horizons with the final
(single) apparent horizon. The marginally outer trapped surfaces (MOTSs) that
foliate these tubes can have complicated geometries as well as non-spherical
topologies. In... | [
{
"created": "Fri, 1 Dec 2023 18:47:56 GMT",
"version": "v1"
}
] | 2024-06-14 | [
[
"Sievers",
"Kam To Billy",
""
],
[
"Newhook",
"Liam",
""
],
[
"Muth",
"Sarah",
""
],
[
"Booth",
"Ivan",
""
],
[
"Hennigar",
"Robie A.",
""
],
[
"Kunduri",
"Hari K.",
""
]
] | During a binary black hole merger, multiple intermediary marginally outer trapped tubes connect the initial pair of apparent horizons with the final (single) apparent horizon. The marginally outer trapped surfaces (MOTSs) that foliate these tubes can have complicated geometries as well as non-spherical topologies. In p... |
1804.07955 | Cosimo Bambi | Yuexin Zhang, Menglei Zhou, Cosimo Bambi | Iron line spectroscopy of black holes in asymptotically safe gravity | 9 pages, 6 figures. v2: refereed version | Eur. Phys. J. C (2018) 78:376 | 10.1140/epjc/s10052-018-5875-0 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the iron line shape expected in the reflection spectrum of accretion
disks around black holes in asymptotically safe gravity. We compare the results
of our simulations with the iron line shapes expected in the reflection
spectrum of accretion disks around Kerr black holes to see if the technique of
iron line... | [
{
"created": "Sat, 21 Apr 2018 12:28:19 GMT",
"version": "v1"
},
{
"created": "Fri, 4 May 2018 11:27:24 GMT",
"version": "v2"
}
] | 2018-05-17 | [
[
"Zhang",
"Yuexin",
""
],
[
"Zhou",
"Menglei",
""
],
[
"Bambi",
"Cosimo",
""
]
] | We study the iron line shape expected in the reflection spectrum of accretion disks around black holes in asymptotically safe gravity. We compare the results of our simulations with the iron line shapes expected in the reflection spectrum of accretion disks around Kerr black holes to see if the technique of iron line s... |
2103.11698 | Jo\~ao Lu\'is Rosa | Jo\~ao Lu\'is Rosa | Junction conditions and thin-shells in perfect-fluid $f\left(R,T\right)$
gravity | 21 pages | Phys. Rev. D 103, 104069 (2021) | 10.1103/PhysRevD.103.104069 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we derive the junction conditions for the matching between two
spacetimes at a separation hypersurface in the perfect-fluid version of
$f\left(R,T\right)$ gravity, not only in the usual geometrical representation
but also in a dynamically equivalent scalar-tensor representation. We start
with the general... | [
{
"created": "Mon, 22 Mar 2021 10:05:54 GMT",
"version": "v1"
},
{
"created": "Fri, 28 May 2021 15:39:34 GMT",
"version": "v2"
}
] | 2021-06-02 | [
[
"Rosa",
"João Luís",
""
]
] | In this work we derive the junction conditions for the matching between two spacetimes at a separation hypersurface in the perfect-fluid version of $f\left(R,T\right)$ gravity, not only in the usual geometrical representation but also in a dynamically equivalent scalar-tensor representation. We start with the general c... |
gr-qc/9602039 | Glenn D. Starkman | Neil J. Cornish (Case Western Reserve Univ.), David N. Spergel
(Princeton U. and U of Maryland) and Glenn D. Starkman (C.W.R.U.) | Circles in the Sky: Finding Topology with the Microwave Background
Radiation | 6 pages, 1 latex file, no figures | Class.Quant.Grav. 15 (1998) 2657-2670 | null | CWRU-P1-96 | gr-qc | null | If the universe is finite and smaller than the distance to the surface of
last scatter, then the signature of the topology of the universe is writ on the
microwave background sky. Previous efforts to search for this topology have
focused on one particular model: a toroidal flat universe. We show how both the
high deg... | [
{
"created": "Tue, 20 Feb 1996 20:22:31 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Feb 1996 22:25:07 GMT",
"version": "v2"
}
] | 2016-02-09 | [
[
"Cornish",
"Neil J.",
"",
"Case Western Reserve Univ."
],
[
"Spergel",
"David N.",
"",
"Princeton U. and U of Maryland"
],
[
"Starkman",
"Glenn D.",
"",
"C.W.R.U."
]
] | If the universe is finite and smaller than the distance to the surface of last scatter, then the signature of the topology of the universe is writ on the microwave background sky. Previous efforts to search for this topology have focused on one particular model: a toroidal flat universe. We show how both the high degre... |
gr-qc/0208010 | null | John C. Baez, J. Daniel Christensen and Greg Egan | Asymptotics of 10j symbols | 25 pages LaTeX with 8 encapsulated Postscript figures. v2 has various
clarifications and better page breaks. v3 is the final version, to appear in
Classical and Quantum Gravity, and has a few minor corrections and additional
references | Class.Quant.Grav.19:6489,2002 | 10.1088/0264-9381/19/24/315 | null | gr-qc | null | The Riemannian 10j symbols are spin networks that assign an amplitude to each
4-simplex in the Barrett-Crane model of Riemannian quantum gravity. This
amplitude is a function of the areas of the 10 faces of the 4-simplex, and
Barrett and Williams have shown that one contribution to its asymptotics comes
from the Regg... | [
{
"created": "Mon, 5 Aug 2002 10:36:35 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Aug 2002 21:10:31 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Nov 2002 20:31:11 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Baez",
"John C.",
""
],
[
"Christensen",
"J. Daniel",
""
],
[
"Egan",
"Greg",
""
]
] | The Riemannian 10j symbols are spin networks that assign an amplitude to each 4-simplex in the Barrett-Crane model of Riemannian quantum gravity. This amplitude is a function of the areas of the 10 faces of the 4-simplex, and Barrett and Williams have shown that one contribution to its asymptotics comes from the Regge ... |
1710.06620 | Salvatore Capozziello | G. G. L. Nashed and S. Capozziello | Charged Anti-de Sitter BTZ black holes in Maxwell-$f(T)$ gravity | 15 pages, accepted for publication in IJMPA | null | 10.1142/S0217751X18500768 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the BTZ formalism, we discuss the Maxwell-$f(T)$ gravity in
(2+1)-dimensions. The main task is to derive exact solutions for a special form
of $f(T)=T+\epsilon T^2$, with $T$ being the torsion scalar of
Weitzenb$\ddot{\mbox{o}}$ck geometry. To this end, a triad field is applied to
the equations of motion ... | [
{
"created": "Wed, 18 Oct 2017 08:35:24 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Apr 2018 16:05:34 GMT",
"version": "v2"
}
] | 2018-05-23 | [
[
"Nashed",
"G. G. L.",
""
],
[
"Capozziello",
"S.",
""
]
] | Inspired by the BTZ formalism, we discuss the Maxwell-$f(T)$ gravity in (2+1)-dimensions. The main task is to derive exact solutions for a special form of $f(T)=T+\epsilon T^2$, with $T$ being the torsion scalar of Weitzenb$\ddot{\mbox{o}}$ck geometry. To this end, a triad field is applied to the equations of motion of... |
1507.06308 | Rajeev Kumar Jain | Alessandro Codello and Rajeev Kumar Jain | On the covariant formalism of the effective field theory of gravity and
leading order corrections | v1: 35 pages, 3 figures; v2: 32 pages, 3 figures, title slightly
changed, minor corrections, published in Classical and Quantum Gravity | Class. Quantum Grav. 33, 225006 (2016) | 10.1088/0264-9381/33/22/225006 | CP3-Origins-2015-28 DNRF90 and DIAS-2015-28 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the covariant effective field theory of gravity as an expansion
in inverse powers of the Planck mass, identifying the leading and
next-to-leading quantum corrections. We determine the form of the effective
action for the cases of pure gravity with cosmological constant as well as
gravity coupled to matte... | [
{
"created": "Wed, 22 Jul 2015 20:00:34 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Nov 2016 11:13:31 GMT",
"version": "v2"
}
] | 2016-11-08 | [
[
"Codello",
"Alessandro",
""
],
[
"Jain",
"Rajeev Kumar",
""
]
] | We construct the covariant effective field theory of gravity as an expansion in inverse powers of the Planck mass, identifying the leading and next-to-leading quantum corrections. We determine the form of the effective action for the cases of pure gravity with cosmological constant as well as gravity coupled to matter.... |
gr-qc/0511058 | Hector H. Hernandez | Martin Bojowald, Hector H. Hernandez, Hugo A Morales-Tecotl | Perturbative Degrees of Freedom in Loop Quantum Gravity: Anisotropies | 32 pages | Class.Quant.Grav.23:3491-3516,2006 | 10.1088/0264-9381/23/10/017 | AEI-2005-170, NI05064 | gr-qc hep-th | null | The relation between an isotropic and an anisotropic model in loop quantum
cosmology is discussed in detail, comparing the strict symmetry reduction with
a perturbative implementation of symmetry. While the latter cannot be done in a
canonical manner, it allows to consider the dynamics including the role of
small non... | [
{
"created": "Fri, 11 Nov 2005 10:33:23 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Bojowald",
"Martin",
""
],
[
"Hernandez",
"Hector H.",
""
],
[
"Morales-Tecotl",
"Hugo A",
""
]
] | The relation between an isotropic and an anisotropic model in loop quantum cosmology is discussed in detail, comparing the strict symmetry reduction with a perturbative implementation of symmetry. While the latter cannot be done in a canonical manner, it allows to consider the dynamics including the role of small non-s... |
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