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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2403.00035 | Zeeshan Gul | M. Zeeshan Gul and M. Sharif | Viable Wormhole Solutions in Modified Gauss-Bonnet Gravity | 37 pages, 10 figures. arXiv admin note: text overlap with
arXiv:2311.05502 | Chin. J. Phys. 88(2024)388 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we use the embedding class-I technique to examine the effect
of charge on traversable wormhole geometry in the context of $f(\mathcal{G})$
theory, where $\mathcal{G}$ is the Gauss-Bonnet term. For this purpose, we
consider static spherical spacetime with anisotropic matter configuration to
investigate ... | [
{
"created": "Thu, 29 Feb 2024 05:27:05 GMT",
"version": "v1"
}
] | 2024-03-04 | [
[
"Gul",
"M. Zeeshan",
""
],
[
"Sharif",
"M.",
""
]
] | In this paper, we use the embedding class-I technique to examine the effect of charge on traversable wormhole geometry in the context of $f(\mathcal{G})$ theory, where $\mathcal{G}$ is the Gauss-Bonnet term. For this purpose, we consider static spherical spacetime with anisotropic matter configuration to investigate th... |
gr-qc/9908007 | Kengo Maeda | Kengo Maeda, Takashi Torii, and Makoto Narita | String excitation inside generic black holes | 8 pages, REVtex, 4 figures, Submitted to PRD | Phys.Rev. D61 (2000) 024020 | 10.1103/PhysRevD.61.024020 | WU-AP/80/99 | gr-qc hep-th | null | We calculate how much a first-quantized string is excited after crossing the
inner horizon of charged Vaidya solutions, as a simple model of generic black
holes. To quantize a string suitably, we first show that the metric is
approximated by a {\it plane-wave} metric near the inner horizon when the
surface gravity of... | [
{
"created": "Mon, 2 Aug 1999 08:53:09 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Maeda",
"Kengo",
""
],
[
"Torii",
"Takashi",
""
],
[
"Narita",
"Makoto",
""
]
] | We calculate how much a first-quantized string is excited after crossing the inner horizon of charged Vaidya solutions, as a simple model of generic black holes. To quantize a string suitably, we first show that the metric is approximated by a {\it plane-wave} metric near the inner horizon when the surface gravity of t... |
gr-qc/0302086 | Gustavo Dotti | Gustavo Dotti and Reinaldo J. Gleiser | Remarks on experimental bounds on quantum gravity effects on fermions | 7 pages | Phys.Rev. D67 (2003) 101501 | 10.1103/PhysRevD.67.101501 | null | gr-qc | null | Effects of space time geometry fluctuations on fermionic fields have recently
been looked for in nuclear physics experiments, and were found to be much lower
than predicted, at a phenomenological level, by loop quantum gravity. We show
that possible corrections to the canonical structure in the semi classical
regime ... | [
{
"created": "Thu, 20 Feb 2003 13:50:05 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Apr 2003 19:55:11 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Dotti",
"Gustavo",
""
],
[
"Gleiser",
"Reinaldo J.",
""
]
] | Effects of space time geometry fluctuations on fermionic fields have recently been looked for in nuclear physics experiments, and were found to be much lower than predicted, at a phenomenological level, by loop quantum gravity. We show that possible corrections to the canonical structure in the semi classical regime ma... |
2202.00201 | Yasutaka Koga | Yasutaka Koga, Nobuyuki Asaka, Masashi Kimura, Kazumasa Okabayashi | Dynamical photon sphere and time evolving shadow around black holes with
temporal accretion | 49 pages, 31 figures | Phys. Rev. D 105, 104040 (2022) | 10.1103/PhysRevD.105.104040 | OCU-PHYS-556, AP-GR-177, RUP-22-2 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A photon sphere is known as the geometrical structure shaping a black hole
shadow. The mechanism is well understood for static or stationary black hole
spacetimes such as the Schwarzschild and the Kerr spacetimes. In this paper, we
investigate and explicitly specify a photon sphere that shapes a black hole
shadow in ... | [
{
"created": "Tue, 1 Feb 2022 03:39:19 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2022 15:30:05 GMT",
"version": "v2"
},
{
"created": "Tue, 24 May 2022 08:47:02 GMT",
"version": "v3"
}
] | 2022-05-25 | [
[
"Koga",
"Yasutaka",
""
],
[
"Asaka",
"Nobuyuki",
""
],
[
"Kimura",
"Masashi",
""
],
[
"Okabayashi",
"Kazumasa",
""
]
] | A photon sphere is known as the geometrical structure shaping a black hole shadow. The mechanism is well understood for static or stationary black hole spacetimes such as the Schwarzschild and the Kerr spacetimes. In this paper, we investigate and explicitly specify a photon sphere that shapes a black hole shadow in a ... |
gr-qc/0501052 | Choquet-Bruhat | Yvonne Choquet-Bruhat | Future complete spacetimes with spacelike isometry group and field
sources | to appear in proceedings of the greek relativity meeting 2004 | J.Phys.Conf.Ser. 8 (2005) 1-12 | 10.1088/1742-6596/8/1/001 | null | gr-qc | null | We extend to the Einstein Maxwell Higgs system results first obtained
previously in collaboration with V. Moncrief for Einstein equations in vacuum.
| [
{
"created": "Mon, 17 Jan 2005 19:18:31 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Choquet-Bruhat",
"Yvonne",
""
]
] | We extend to the Einstein Maxwell Higgs system results first obtained previously in collaboration with V. Moncrief for Einstein equations in vacuum. |
1906.07015 | Giovanni Tambalo | Paolo Creminelli, Giovanni Tambalo, Filippo Vernizzi and Vicharit
Yingcharoenrat | Resonant Decay of Gravitational Waves into Dark Energy | 31 pages, 7 figures. Matches JCAP version | null | 10.1088/1475-7516/2019/10/072 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the decay of gravitational waves into dark energy fluctuations
$\pi$, taking into account the large occupation numbers. We describe dark
energy using the effective field theory approach, in the context of generalized
scalar-tensor theories. When the $m_3^3$ (cubic Horndeski) and $\tilde m_4^2$
(beyond Hornde... | [
{
"created": "Fri, 14 Jun 2019 17:59:19 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Oct 2019 10:33:12 GMT",
"version": "v2"
}
] | 2019-10-31 | [
[
"Creminelli",
"Paolo",
""
],
[
"Tambalo",
"Giovanni",
""
],
[
"Vernizzi",
"Filippo",
""
],
[
"Yingcharoenrat",
"Vicharit",
""
]
] | We study the decay of gravitational waves into dark energy fluctuations $\pi$, taking into account the large occupation numbers. We describe dark energy using the effective field theory approach, in the context of generalized scalar-tensor theories. When the $m_3^3$ (cubic Horndeski) and $\tilde m_4^2$ (beyond Horndesk... |
gr-qc/9909091 | Angelo Loinger | A.Loinger (Dipartimento di Fisica, Universita' di Milano, Italy) | Waves and uniformity of space-times | 6 pages, PDF from MS-Word97, submitted to Il Nuovo Cimento, Section B | null | null | null | gr-qc astro-ph | null | Undulatory field functions represent a real wave only if there exists a class
of infinite reference systems for which an identical wave is described by the
same functional forms.
| [
{
"created": "Thu, 30 Sep 1999 11:02:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Loinger",
"A.",
"",
"Dipartimento di Fisica, Universita' di Milano, Italy"
]
] | Undulatory field functions represent a real wave only if there exists a class of infinite reference systems for which an identical wave is described by the same functional forms. |
1810.10574 | Filip Ficek | Piotr Bizon, Oleg Evnin, Filip Ficek | A nonrelativistic limit for AdS perturbations | v3: slightly expanded published version | JHEP 1812 (2018) 113 | 10.1007/JHEP12(2018)113 | null | gr-qc math.AP | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The familiar $c\rightarrow \infty$ nonrelativistic limit converts the
Klein-Gordon equation in Minkowski spacetime to the free Schroedinger equation,
and the Einstein-massive-scalar system without a cosmological constant to the
Schroedinger-Newton (SN) equation. In this paper, motivated by the problem of
stability of... | [
{
"created": "Wed, 24 Oct 2018 18:45:28 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Nov 2018 07:02:00 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Dec 2018 09:35:07 GMT",
"version": "v3"
}
] | 2018-12-27 | [
[
"Bizon",
"Piotr",
""
],
[
"Evnin",
"Oleg",
""
],
[
"Ficek",
"Filip",
""
]
] | The familiar $c\rightarrow \infty$ nonrelativistic limit converts the Klein-Gordon equation in Minkowski spacetime to the free Schroedinger equation, and the Einstein-massive-scalar system without a cosmological constant to the Schroedinger-Newton (SN) equation. In this paper, motivated by the problem of stability of A... |
1109.5654 | A. Yu. Petrov | C. Furtado, J. R. Nascimento, A. Yu. Petrov, A. F. Santos | The aether-modified gravity and the Godel metric | 12 pages, revised version | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We formulate the nonminimal aether-modified gravity whose action represents
itself as a sum of the usual Einstein-Hilbert action and the CPT-even
Lorentz-breaking aether-like gravity term proposed by Carroll. For this theory,
we show that the G\"{o}del metric solves the modified Einstein equations under
a correspondi... | [
{
"created": "Mon, 26 Sep 2011 17:44:31 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 2011 18:56:30 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Mar 2012 13:12:48 GMT",
"version": "v3"
},
{
"created": "Tue, 26 Mar 2013 18:55:31 GMT",
"version": "v4"
}
] | 2013-03-27 | [
[
"Furtado",
"C.",
""
],
[
"Nascimento",
"J. R.",
""
],
[
"Petrov",
"A. Yu.",
""
],
[
"Santos",
"A. F.",
""
]
] | We formulate the nonminimal aether-modified gravity whose action represents itself as a sum of the usual Einstein-Hilbert action and the CPT-even Lorentz-breaking aether-like gravity term proposed by Carroll. For this theory, we show that the G\"{o}del metric solves the modified Einstein equations under a corresponding... |
2309.00551 | Andrew DeBenedictis | Sasa Ilijic, Andrew DeBenedictis | On a Class of Exact Arbitrarily Differentiable de Sitter Cores with Kerr
Exteriors: Possible gravastar or regular black hole mimickers | 27 pages | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the paradigm of non-perturbative Einstein gravity we study continuous
manifolds which possess de Sitter interiors and Kerr exteriors. These manifolds
could represent the spacetime of rotating gravastars or other similar black
hole mimickers. The scheme presented here allows for a $C^{n}$ transition from
the ex... | [
{
"created": "Fri, 1 Sep 2023 15:59:34 GMT",
"version": "v1"
}
] | 2023-09-04 | [
[
"Ilijic",
"Sasa",
""
],
[
"DeBenedictis",
"Andrew",
""
]
] | Within the paradigm of non-perturbative Einstein gravity we study continuous manifolds which possess de Sitter interiors and Kerr exteriors. These manifolds could represent the spacetime of rotating gravastars or other similar black hole mimickers. The scheme presented here allows for a $C^{n}$ transition from the exac... |
2009.01700 | Arman Stepanian | A. Stepanian, Sh. Khlghatyan | Lense-Thirring precession and modified gravity constraints | 6 pages, 8 tables, Eur.Phys.J Plus (in press) | Eur. Phys. J. Plus 135, 712 (2020) | 10.1140/epjp/s13360-020-00753-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The orbital Lense-Thirring precession is considered in the context of
constraints for weak-field General Relativity involving the cosmological
constant $\Lambda$. It is shown that according to the current accuracy of
satellite measurements the obtained error limits for $\Lambda$ is
self-consistent with cosmological o... | [
{
"created": "Thu, 3 Sep 2020 14:24:04 GMT",
"version": "v1"
}
] | 2020-10-06 | [
[
"Stepanian",
"A.",
""
],
[
"Khlghatyan",
"Sh.",
""
]
] | The orbital Lense-Thirring precession is considered in the context of constraints for weak-field General Relativity involving the cosmological constant $\Lambda$. It is shown that according to the current accuracy of satellite measurements the obtained error limits for $\Lambda$ is self-consistent with cosmological obs... |
1906.05536 | Muxin Han | Muxin Han | Semiclassical Behavior of Spinfoam Amplitude with Small Spins and
Entanglement Entropy | 30 pages, 7 figures | Phys. Rev. D 100, 084049 (2019) | 10.1103/PhysRevD.100.084049 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spinfoam amplitudes with small spins can have interesting semiclassical
behavior and relate to semiclassical gravity and geometry in 4 dimensions. We
study the generalized spinfoam model (Spinfoams for all loop quantum gravity
(LQG)) with small spins $j$ but a large number of spin degrees of freedom
(DOFs), and find ... | [
{
"created": "Thu, 13 Jun 2019 08:10:34 GMT",
"version": "v1"
}
] | 2019-10-22 | [
[
"Han",
"Muxin",
""
]
] | Spinfoam amplitudes with small spins can have interesting semiclassical behavior and relate to semiclassical gravity and geometry in 4 dimensions. We study the generalized spinfoam model (Spinfoams for all loop quantum gravity (LQG)) with small spins $j$ but a large number of spin degrees of freedom (DOFs), and find th... |
2102.04345 | Haryanto Siahaan | Haryanto M. Siahaan | Magnetized Kerr-Taub-NUT spacetime and Kerr/CFT correspondence | 18 pages, 1 figure | null | 10.1016/j.physletb.2021.136568 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present a new solution in Einstein-Maxwell theory which can be considered
as the magnetized version of Kerr-Taub-NUT solution. Some properties of the
spacetime are discussed. We also compute the entropy of extremal black hole in
the spacetime by using the Kerr/CFT correspondence approach.
| [
{
"created": "Mon, 8 Feb 2021 16:48:07 GMT",
"version": "v1"
}
] | 2021-08-11 | [
[
"Siahaan",
"Haryanto M.",
""
]
] | We present a new solution in Einstein-Maxwell theory which can be considered as the magnetized version of Kerr-Taub-NUT solution. Some properties of the spacetime are discussed. We also compute the entropy of extremal black hole in the spacetime by using the Kerr/CFT correspondence approach. |
1801.07048 | Badri Krishnan | Anshu Gupta, Badri Krishnan, Alex B. Nielsen, Erik Schnetter | Dynamics of marginally trapped surfaces in a binary black hole merger:
Growth and approach to equilibrium | 18 pages, 11 figures | Phys. Rev. D 97, 084028 (2018) | 10.1103/PhysRevD.97.084028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The behavior of quasi-local black hole horizons in a binary black hole merger
is studied numerically. We compute the horizon multipole moments, fluxes and
other quantities on black hole horizons throughout the merger. These lead to a
better qualitative and quantitative understanding of the coalescence of two
black ho... | [
{
"created": "Mon, 22 Jan 2018 11:28:17 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Mar 2018 15:52:12 GMT",
"version": "v2"
}
] | 2018-04-25 | [
[
"Gupta",
"Anshu",
""
],
[
"Krishnan",
"Badri",
""
],
[
"Nielsen",
"Alex B.",
""
],
[
"Schnetter",
"Erik",
""
]
] | The behavior of quasi-local black hole horizons in a binary black hole merger is studied numerically. We compute the horizon multipole moments, fluxes and other quantities on black hole horizons throughout the merger. These lead to a better qualitative and quantitative understanding of the coalescence of two black hole... |
2309.15020 | En-Kun Li | En-Kun Li, Han Wang, Hong-Yu Chen, Huimin Fan, Ya-Nan Li, Zhi-Yuan Li,
Zheng-Cheng Liang, Xiang-Yu Lyu, Tian-Xiao Wang, Zheng Wu, Chang-Qing Ye,
Xue-Ting Zhang, Yiming Hu, Jianwei Mei | GWSpace: a multi-mission science data simulator for space-based
gravitational wave detection | 24 pages, 13 figures, GWSpace will be uploaded at
https://github.com/TianQinSYSU/GWSpace | null | null | null | gr-qc astro-ph.CO astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | Space-based gravitational wave detectors such as TianQin, LISA, and TaiJi
have the potential to outperform themselves through joint observation. To
achieve this, it is desirable to practice joint data analysis in advance on
simulated data that encodes the intrinsic correlation among the signals found
in different det... | [
{
"created": "Tue, 26 Sep 2023 15:40:53 GMT",
"version": "v1"
}
] | 2023-09-27 | [
[
"Li",
"En-Kun",
""
],
[
"Wang",
"Han",
""
],
[
"Chen",
"Hong-Yu",
""
],
[
"Fan",
"Huimin",
""
],
[
"Li",
"Ya-Nan",
""
],
[
"Li",
"Zhi-Yuan",
""
],
[
"Liang",
"Zheng-Cheng",
""
],
[
"Lyu",
"Xiang... | Space-based gravitational wave detectors such as TianQin, LISA, and TaiJi have the potential to outperform themselves through joint observation. To achieve this, it is desirable to practice joint data analysis in advance on simulated data that encodes the intrinsic correlation among the signals found in different detec... |
gr-qc/0305054 | Malcolm Fairbairn | Robert Brout | Condensation of Planckian Modes and the Inflaton | Recipient of Honorable Mention in the Gravity Research Foundation
Essay competition 2003. 6 pages | null | null | ULB-TH/03-18 | gr-qc | null | To confront the transplanckian problem encountered in the backward
extrapolation of the cosmological expansion of the momenta of the modes of
quantum field theory, it is proposed that there is a reservoir, depository of
transplanckian degrees of freedom. These are solicited by the cisplanckian
modes so as to keep the... | [
{
"created": "Wed, 14 May 2003 15:42:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brout",
"Robert",
""
]
] | To confront the transplanckian problem encountered in the backward extrapolation of the cosmological expansion of the momenta of the modes of quantum field theory, it is proposed that there is a reservoir, depository of transplanckian degrees of freedom. These are solicited by the cisplanckian modes so as to keep their... |
1101.2925 | Ian Vega | Ian Vega, Barry Wardell, Peter Diener | Effective source approach to self-force calculations | Invited review for NRDA/Capra 2010 (Theory Meets Data Analysis at
Comparable and Extreme Mass Ratios), Perimeter Institute, June 2010, CQG
special issue - 22 pages, 8 figures | Class. Quantum Grav. 28 134010, 2011 | 10.1088/0264-9381/28/13/134010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerical evaluation of the self-force on a point particle is made difficult
by the use of delta functions as sources. Recent methods for self-force
calculations avoid delta functions altogether, using instead a finite and
extended "effective source" for a point particle. We provide a review of the
general principles... | [
{
"created": "Fri, 14 Jan 2011 22:43:08 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Vega",
"Ian",
""
],
[
"Wardell",
"Barry",
""
],
[
"Diener",
"Peter",
""
]
] | Numerical evaluation of the self-force on a point particle is made difficult by the use of delta functions as sources. Recent methods for self-force calculations avoid delta functions altogether, using instead a finite and extended "effective source" for a point particle. We provide a review of the general principles u... |
1608.08390 | Lavinia Heisenberg | Lavinia Heisenberg, Ryotaro Kase and Shinji Tsujikawa | Absence of solid angle deficit singularities in beyond-generalized Proca
theories | 16 pages, minor changes, journal version | Phys. Rev. D 94, 123513 (2016) | 10.1103/PhysRevD.94.123513 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Gleyzes-Langlois-Piazza-Vernizzi (GLPV) scalar-tensor theories, which are
outside the domain of second-order Horndeski theories, it is known that there
exists a solid angle deficit singularity in the case where the parameter
$\alpha_{\rm H}$ characterizing the deviation from Horndeski theories
approaches a non-van... | [
{
"created": "Tue, 30 Aug 2016 10:00:10 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Dec 2016 08:13:03 GMT",
"version": "v2"
}
] | 2016-12-28 | [
[
"Heisenberg",
"Lavinia",
""
],
[
"Kase",
"Ryotaro",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | In Gleyzes-Langlois-Piazza-Vernizzi (GLPV) scalar-tensor theories, which are outside the domain of second-order Horndeski theories, it is known that there exists a solid angle deficit singularity in the case where the parameter $\alpha_{\rm H}$ characterizing the deviation from Horndeski theories approaches a non-vanis... |
gr-qc/0310129 | Charles Wang | Charles H-T Wang, Smaragda Kessari and Edward R Irvine | An action principle for the quantization of parametric theories and
nonlinear quantum cosmology | 14 pages | Classical and Quantum Gravity 21 (2004) 2319-2332 | 10.1088/0264-9381/21/9/008 | null | gr-qc | null | By parametrizing the action integral for the standard Schrodinger equation we
present a derivation of the recently proposed method for quantizing a
parametrized theory. The reformulation suggests a natural extension from
conventional to nonlinear quantum mechanics. This generalization enables a
unitary description of... | [
{
"created": "Thu, 30 Oct 2003 10:51:49 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Feb 2004 17:01:53 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Apr 2004 15:20:22 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Wang",
"Charles H-T",
""
],
[
"Kessari",
"Smaragda",
""
],
[
"Irvine",
"Edward R",
""
]
] | By parametrizing the action integral for the standard Schrodinger equation we present a derivation of the recently proposed method for quantizing a parametrized theory. The reformulation suggests a natural extension from conventional to nonlinear quantum mechanics. This generalization enables a unitary description of t... |
2311.12270 | Jian-Pin Wu | Ruo-Ting Chen, Shulan Li, Li-Gang Zhu, Jian-Pin Wu | Constraints from Solar System tests on a covariant loop quantum black
hole | 31 pages, Published version | Phys.Rev.D 109 (2024) 2, 024010 | 10.1103/PhysRevD.109.024010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a covariant spherically symmetric model of a black hole within the
framework of loop quantum gravity (LQG), characterized by a quantum parameter
$r_0$ or $\lambda$, has been proposed. To derive constraints on the
LQG-corrected parameter, we explore observational constraints imposed on $r_0$
and $\lambda$ th... | [
{
"created": "Tue, 21 Nov 2023 01:19:46 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2024 09:32:18 GMT",
"version": "v2"
}
] | 2024-01-10 | [
[
"Chen",
"Ruo-Ting",
""
],
[
"Li",
"Shulan",
""
],
[
"Zhu",
"Li-Gang",
""
],
[
"Wu",
"Jian-Pin",
""
]
] | Recently, a covariant spherically symmetric model of a black hole within the framework of loop quantum gravity (LQG), characterized by a quantum parameter $r_0$ or $\lambda$, has been proposed. To derive constraints on the LQG-corrected parameter, we explore observational constraints imposed on $r_0$ and $\lambda$ thro... |
gr-qc/0604041 | Gergely Sz\'ekely | Judit X. Madarasz, Istvan Nemeti and Gergely Szekely | First-Order Logic Foundation of Relativity Theories | 25 pages, 4 figures | In: New Logics for the XXIst Century II, Mathematical Problems
from Applied Logics, International Mathematical Series Vol 5, Springer,
(2006) | null | null | gr-qc math-ph math.LO math.MP | null | Motivation and perspective for an exciting new research direction
interconnecting logic, spacetime theory, relativity--including such
revolutionary areas as black hole physics, relativistic computers, new
cosmology--are presented in this paper. We would like to invite the logician
reader to take part in this grand en... | [
{
"created": "Mon, 10 Apr 2006 11:45:33 GMT",
"version": "v1"
}
] | 2007-07-17 | [
[
"Madarasz",
"Judit X.",
""
],
[
"Nemeti",
"Istvan",
""
],
[
"Szekely",
"Gergely",
""
]
] | Motivation and perspective for an exciting new research direction interconnecting logic, spacetime theory, relativity--including such revolutionary areas as black hole physics, relativistic computers, new cosmology--are presented in this paper. We would like to invite the logician reader to take part in this grand ente... |
1505.04589 | Lau Loi So | Lau Loi So | General relativistic tidal work for Papapetrou, Weinberg and Goldberg
pseudotensors | 6 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 1998 Thorne claimed that all pseudotensors give the same tidal work as the
Newtonian theory. In 1999, Purdue used the Landau-Lifshitz pseudotensor to
calculate the tidal heating and the result matched with the Newtonian gravity.
Soon after in 2001, Favata employed the same method to examine the Einstein,
Bergmann-... | [
{
"created": "Mon, 18 May 2015 10:47:00 GMT",
"version": "v1"
}
] | 2015-05-19 | [
[
"So",
"Lau Loi",
""
]
] | In 1998 Thorne claimed that all pseudotensors give the same tidal work as the Newtonian theory. In 1999, Purdue used the Landau-Lifshitz pseudotensor to calculate the tidal heating and the result matched with the Newtonian gravity. Soon after in 2001, Favata employed the same method to examine the Einstein, Bergmann-Th... |
2107.11816 | Stephen Adler | Stephen L. Adler | Are Astrophysical "Black" Holes Leaky? | 23 pages, 1 figure | Int. J. Mod. Phys. D 31, 2250070 (2022) | 10.1142/S0218271822500705 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We continue a study by Adler and Ramazano\uglu (AR) of "black" holes as
modified by a scale invariant dark energy action. For the spherically symmetric
Schwarzschild-like case, (AR) found that there is no event horizon; hence
spacetime is not divided by the "black" hole into causally disconnected
regions. We review t... | [
{
"created": "Sun, 25 Jul 2021 14:37:08 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Aug 2021 16:12:57 GMT",
"version": "v2"
},
{
"created": "Sat, 30 Apr 2022 21:36:01 GMT",
"version": "v3"
}
] | 2022-09-07 | [
[
"Adler",
"Stephen L.",
""
]
] | We continue a study by Adler and Ramazano\uglu (AR) of "black" holes as modified by a scale invariant dark energy action. For the spherically symmetric Schwarzschild-like case, (AR) found that there is no event horizon; hence spacetime is not divided by the "black" hole into causally disconnected regions. We review the... |
1009.2533 | Sean McWilliams | Janna Levin, Sean T. McWilliams, and Hugo Contreras | Inspiral of Generic Black Hole Binaries: Spin, Precession, and
Eccentricity | 29 pages, 8 figures, published in CQG | Class.Quant.Grav.28:175001,2011 | 10.1088/0264-9381/28/17/175001 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given the absence of observations of black hole binaries, it is critical that
the full range of accessible parameter space be explored in anticipation of
future observation with gravitational wave detectors. To this end, we compile
the Hamiltonian equations of motion describing the conservative dynamics of the
most g... | [
{
"created": "Mon, 13 Sep 2010 22:33:10 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jun 2011 03:15:25 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Jul 2011 16:43:13 GMT",
"version": "v3"
}
] | 2011-07-29 | [
[
"Levin",
"Janna",
""
],
[
"McWilliams",
"Sean T.",
""
],
[
"Contreras",
"Hugo",
""
]
] | Given the absence of observations of black hole binaries, it is critical that the full range of accessible parameter space be explored in anticipation of future observation with gravitational wave detectors. To this end, we compile the Hamiltonian equations of motion describing the conservative dynamics of the most gen... |
2405.13834 | Daniela Pugliese Dr | D. Pugliese, Z. Stuchl{\i}k | Constraining photon trajectories in black hole shadows | 25 pages; 24 multi-panel figure, to appear in EPJP | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We examine the shadow cast by a Kerr black hole, focusing on constraints on
photons corresponding to different shadow boundaries. The photons are related
to different orbital ranges and impact parameter values, creating a map of the
shadow boundaries. Our analysis fixes also the conditions under which it is
possible ... | [
{
"created": "Wed, 22 May 2024 16:59:59 GMT",
"version": "v1"
}
] | 2024-05-24 | [
[
"Pugliese",
"D.",
""
],
[
"Stuchlık",
"Z.",
""
]
] | We examine the shadow cast by a Kerr black hole, focusing on constraints on photons corresponding to different shadow boundaries. The photons are related to different orbital ranges and impact parameter values, creating a map of the shadow boundaries. Our analysis fixes also the conditions under which it is possible to... |
2308.09178 | M\'arcio Eduardo Da Silva Alves | M\'arcio E.S. Alves | Testing gravity with gauge-invariant polarization states of
gravitational waves: Theory and pulsar timing sensitivity | 20 pages, 9 figures, 1 table | M\'arcio E.S. Alves, Phys. Rev. D 109, 104054. Published 17 May
2024 | 10.1103/PhysRevD.109.104054 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The determination of the polarization modes of gravitational waves (GWs) and
their dispersion relations is a crucial task for scrutinizing the viability of
extended theories of gravity. A tool to investigate the polarization states of
GWs is the well-known formalism developed by Eardley, Lee, and Lightman (ELL)
[Phys... | [
{
"created": "Thu, 17 Aug 2023 20:33:08 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jul 2024 17:39:49 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Jul 2024 12:00:18 GMT",
"version": "v3"
}
] | 2024-07-03 | [
[
"Alves",
"Márcio E. S.",
""
]
] | The determination of the polarization modes of gravitational waves (GWs) and their dispersion relations is a crucial task for scrutinizing the viability of extended theories of gravity. A tool to investigate the polarization states of GWs is the well-known formalism developed by Eardley, Lee, and Lightman (ELL) [Phys. ... |
1510.04754 | Jianwei Mei | Jianwei Mei, Chenggang Shao and Yan Wang | Fundamentals of the TianQin mission | To be published in the proceedings of the "XIIth International
Conference on Gravitation, Astrophysics and Cosmology", (Moscow, Russia,
2015), World Scientific, Singapore | null | 10.1142/9789814759816_0079 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This talk adds more detail to the proposed TianQin mission \cite{TQ}. The
response of TianQin to a binary source is an important problem for the
experiment. Here we present the detail of the response function of an equal-arm
Michelson interferometer to the gravitation waves of a binary source with a
circular orbit.
| [
{
"created": "Fri, 16 Oct 2015 01:09:17 GMT",
"version": "v1"
}
] | 2016-03-16 | [
[
"Mei",
"Jianwei",
""
],
[
"Shao",
"Chenggang",
""
],
[
"Wang",
"Yan",
""
]
] | This talk adds more detail to the proposed TianQin mission \cite{TQ}. The response of TianQin to a binary source is an important problem for the experiment. Here we present the detail of the response function of an equal-arm Michelson interferometer to the gravitation waves of a binary source with a circular orbit. |
1011.4571 | Philippe G. LeFloch | Philippe G. LeFloch and Sophonie B. Tchapnda | Plane-symmetric spacetimes with positive cosmological constant. The case
of stiff fluids | 18 pages | Adv. Theor. Math. Phys. 15 (2011), 1--27 | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider plane-symmetric spacetimes satisfying Einstein's field equations
with positive cosmological constant, when the matter is a fluid whose pressure
is equal to its mass-energy density (i.e. a so-called stiff fluid). We study
the initial-value problem for the associated Einstein equations and establish a
globa... | [
{
"created": "Sat, 20 Nov 2010 09:33:41 GMT",
"version": "v1"
},
{
"created": "Fri, 6 May 2011 10:02:08 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Apr 2012 22:11:44 GMT",
"version": "v3"
}
] | 2012-05-01 | [
[
"LeFloch",
"Philippe G.",
""
],
[
"Tchapnda",
"Sophonie B.",
""
]
] | We consider plane-symmetric spacetimes satisfying Einstein's field equations with positive cosmological constant, when the matter is a fluid whose pressure is equal to its mass-energy density (i.e. a so-called stiff fluid). We study the initial-value problem for the associated Einstein equations and establish a global ... |
1905.06182 | Massimo Giovannini | Massimo Giovannini | Post-inflationary phases stiffer than radiation and Palatini formulation | 25 pages | Class.Quant.Grav. 36 (2019) no.23, 235017 | 10.1088/1361-6382/ab52a8 | CERN-TH-2019-108 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the inflaton and the quintessence fields are identified, the background
geometry evolves through a stiff epoch undershooting the expansion rate of a
radiation-dominated plasma. For some classes of inflationary potentials this
scenario is at odds with the current observational evidence since the
corresponding tenso... | [
{
"created": "Wed, 15 May 2019 13:44:06 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Giovannini",
"Massimo",
""
]
] | If the inflaton and the quintessence fields are identified, the background geometry evolves through a stiff epoch undershooting the expansion rate of a radiation-dominated plasma. For some classes of inflationary potentials this scenario is at odds with the current observational evidence since the corresponding tensor-... |
2309.12018 | Chandra Prakash Singh | C. P. Singh and Vinita Khatri | Viscous fluid dynamics with decaying vacuum energy density | 18 pages, 18 figures, Revised, some References and figures added | Phys. Rev.D, 109, 023508 (2024) | 10.1103/PhysRevD.109.023508 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we investigate the dynamics of bulk viscous models with
decaying vacuum energy density (VED) in a spatially homogeneous and isotropic
flat Friedmann-Lema\^{i}tre- Robertson-walker (FLRW) spacetime. We particularly
are interested to study the viscous model which considers first order deviation
from equil... | [
{
"created": "Thu, 21 Sep 2023 12:37:42 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2024 05:09:52 GMT",
"version": "v2"
}
] | 2024-01-10 | [
[
"Singh",
"C. P.",
""
],
[
"Khatri",
"Vinita",
""
]
] | In this work, we investigate the dynamics of bulk viscous models with decaying vacuum energy density (VED) in a spatially homogeneous and isotropic flat Friedmann-Lema\^{i}tre- Robertson-walker (FLRW) spacetime. We particularly are interested to study the viscous model which considers first order deviation from equilib... |
2311.15532 | Tieguang Zi | Tieguang Zi, Chang-Qing Ye and Peng-Cheng Li | Detecting the tidal heating with the generic extreme-mass-ratio
inspirals | 10 pages, 5 figures, 1 table | null | null | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The horizon of a classical black hole (BH), functioning as a one-way
membrane, plays a vital role in the dynamic evolution of binary BHs, capable of
absorbing fluxes entirely. Tidal heating, stemming from this phenomenon, exerts
a notable influence on the production of gravitational waves(GWs). If at least
one member... | [
{
"created": "Mon, 27 Nov 2023 04:29:41 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2024 05:51:25 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Jun 2024 16:01:51 GMT",
"version": "v3"
},
{
"created": "Thu, 6 Jun 2024 01:50:33 GMT",
"version": "v4"
},
{
"crea... | 2024-07-23 | [
[
"Zi",
"Tieguang",
""
],
[
"Ye",
"Chang-Qing",
""
],
[
"Li",
"Peng-Cheng",
""
]
] | The horizon of a classical black hole (BH), functioning as a one-way membrane, plays a vital role in the dynamic evolution of binary BHs, capable of absorbing fluxes entirely. Tidal heating, stemming from this phenomenon, exerts a notable influence on the production of gravitational waves(GWs). If at least one member o... |
1811.05313 | Dr. Sudhaker Upadhyay | Nadeem-ul-islam, Prince A. Ganai and Sudhaker Upadhyay | Thermal fluctuations to thermodynamics of non-rotating BTZ black hole | 11 pages, 7 captioned figures, Accepted in PTEP | Prog. Theor. Exp. Phys. 2019, 103B06 | 10.1093/ptep/ptz113 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we discuss the effect of small statistical thermal
fluctuations around the equilibrium on the thermodynamics of small non-rotating
BTZ black hole. This is done by evaluating the leading-order corrections to the
thermodynamical equation of states, namely, entropy, free energy, internal
energy, pressure,... | [
{
"created": "Sat, 10 Nov 2018 02:20:30 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Sep 2019 02:15:24 GMT",
"version": "v2"
}
] | 2019-10-23 | [
[
"Nadeem-ul-islam",
"",
""
],
[
"Ganai",
"Prince A.",
""
],
[
"Upadhyay",
"Sudhaker",
""
]
] | In this paper, we discuss the effect of small statistical thermal fluctuations around the equilibrium on the thermodynamics of small non-rotating BTZ black hole. This is done by evaluating the leading-order corrections to the thermodynamical equation of states, namely, entropy, free energy, internal energy, pressure, e... |
gr-qc/9801004 | Keisuke Taniguchi | Masaru Shibata, Keisuke Taniguchi and Takashi Nakamura | Location of the innermost stable circular orbit of binary neutron stars
in the post Newtonian approximations of general relativity | 33 pages ptptex file, 29 figures, to appear in Progress of
Theoretical Physics Supplement No.128 (1997) `Perturbative and Numerical
Approaches to Gravitational Radiation' | Prog.Theor.Phys.Suppl.128:295-333,1997 | 10.1143/PTPS.128.295 | null | gr-qc | null | In this paper, we present results obtained from our recent studies on the
location of the innermost stable circular orbit (ISCO) for binary neutron stars
(BNSs) in several levels of post Newtonian (PN) approximations. We reach the
following conclusion at present: (1) even in the Newtonian case, there exists
the ISCO ... | [
{
"created": "Mon, 5 Jan 1998 03:33:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Shibata",
"Masaru",
""
],
[
"Taniguchi",
"Keisuke",
""
],
[
"Nakamura",
"Takashi",
""
]
] | In this paper, we present results obtained from our recent studies on the location of the innermost stable circular orbit (ISCO) for binary neutron stars (BNSs) in several levels of post Newtonian (PN) approximations. We reach the following conclusion at present: (1) even in the Newtonian case, there exists the ISCO fo... |
1208.1572 | Alex Bernardini Dr. | Manuela G. Rodrigues and Alex E. Bernardini | Accretion of non-minimally coupled generalized Chaplygin gas into black
holes | 13 pages, 03 figures | Int. J. Mod. Phys. D21, 1250075 (2012) | 10.1142/S0218271812500757 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass evolution of Schwarzschild black holes by the absorption of scalar
fields is investigated in the scenario of the generalized Chaplygin gas (GCG).
The GCG works as a unification picture of dark matter plus dark energy that
naturally accelerates the expansion of the Universe. Through elements of the
quasi-stat... | [
{
"created": "Wed, 8 Aug 2012 03:53:53 GMT",
"version": "v1"
}
] | 2015-08-04 | [
[
"Rodrigues",
"Manuela G.",
""
],
[
"Bernardini",
"Alex E.",
""
]
] | The mass evolution of Schwarzschild black holes by the absorption of scalar fields is investigated in the scenario of the generalized Chaplygin gas (GCG). The GCG works as a unification picture of dark matter plus dark energy that naturally accelerates the expansion of the Universe. Through elements of the quasi-statio... |
gr-qc/0607129 | Dr. Anirudh Pradhan | Anirudh Pradhan and S. Otarod | Universe With Time Dependent Deceleration Parameter and $\Lambda$ Term
in General Relativity | 14 pages, 9 figures. Astrophys. Space Sci. (2006), to appear | Astrophys.SpaceSci.306:11-16,2006 | 10.1007/s10509-006-9178-9 | null | gr-qc | null | A new class of exact solutions of Einstein's field equations with perfect
fluid for an LRS Bianchi type-I spacetime is obtained by using a time dependent
deceleration parameter. We have obtained a general solution of the field
equations from which three models of the universe are derived: exponential,
polynomial and ... | [
{
"created": "Fri, 28 Jul 2006 07:33:17 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Otarod",
"S.",
""
]
] | A new class of exact solutions of Einstein's field equations with perfect fluid for an LRS Bianchi type-I spacetime is obtained by using a time dependent deceleration parameter. We have obtained a general solution of the field equations from which three models of the universe are derived: exponential, polynomial and si... |
gr-qc/0502041 | Robert Beig | Robert Beig, Piotr T. Chru\'sciel | Stationary Black Holes | 11 pages, 2 figures, to appear in Encyclopedia of Mathematical
Physics 2nd edition | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We review the theory of stationary black hole solutions of vacuum Einstein
equations.
| [
{
"created": "Thu, 10 Feb 2005 05:53:09 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jul 2023 13:56:11 GMT",
"version": "v2"
}
] | 2023-07-25 | [
[
"Beig",
"Robert",
""
],
[
"Chruściel",
"Piotr T.",
""
]
] | We review the theory of stationary black hole solutions of vacuum Einstein equations. |
1808.04050 | Ka - Wai Chung | Ka-Wai Chung and Tjonnie Guang Feng Li | Phenomenological Inclusion of Alternative Dispersion Relations to the
Teukolsky Equation and its Application to Bounding the Graviton Mass with
Gravitational-wave Measurements | 8 pages (including appendix and references), 4 figures, Published as
Phys. Rev. D 99, 124023 (2019) | Phys. Rev. D 99, 124023 (2019) | 10.1103/PhysRevD.99.124023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Existing constraints on the graviton mass from gravitational-wave detections
rely on the phase difference developed between different frequencies during the
propagation. Effects on the quasinormal-mode frequencies of the black-hole
ringdown due to the graviton mass are often ignored. While perturbation
theories of bl... | [
{
"created": "Mon, 13 Aug 2018 03:13:11 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Feb 2019 05:52:16 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Jun 2019 06:59:03 GMT",
"version": "v3"
}
] | 2019-06-18 | [
[
"Chung",
"Ka-Wai",
""
],
[
"Li",
"Tjonnie Guang Feng",
""
]
] | Existing constraints on the graviton mass from gravitational-wave detections rely on the phase difference developed between different frequencies during the propagation. Effects on the quasinormal-mode frequencies of the black-hole ringdown due to the graviton mass are often ignored. While perturbation theories of blac... |
gr-qc/9802054 | Franz Schunck | Jayashree Balakrishna and Franz E. Schunck | Gravitational evolution and stability of boson halos | 11 pages, RevTeX, 6 Postscript figures | null | null | null | gr-qc | null | We investigate the gravitational evolution of dark matter halos made up of a
massless bosonic field. The coupled Einstein-Klein-Gordon equations are solved
numerically, showing that such a boson halo is stable and can be formed under a
large class of initial conditions. We also present an analytical proof that
such o... | [
{
"created": "Fri, 20 Feb 1998 15:33:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Balakrishna",
"Jayashree",
""
],
[
"Schunck",
"Franz E.",
""
]
] | We investigate the gravitational evolution of dark matter halos made up of a massless bosonic field. The coupled Einstein-Klein-Gordon equations are solved numerically, showing that such a boson halo is stable and can be formed under a large class of initial conditions. We also present an analytical proof that such obj... |
1307.5307 | Ian Hinder | Ian Hinder (1), Alessandra Buonanno (2), Michael Boyle (3), Zachariah
B. Etienne (4), James Healy (5), Nathan K. Johnson-McDaniel (6), Alessandro
Nagar (7), Hiroyuki Nakano (8 and 9), Yi Pan (2), Harald P. Pfeiffer (10 and
11), Michael P\"urrer (12), Christian Reisswig (13), Mark A. Scheel (13),
Erik Schnetter ... | Error-analysis and comparison to analytical models of numerical
waveforms produced by the NRAR Collaboration | 51 pages, 10 figures; published version | Class. Quantum Grav. 31 (2014) 025012 | 10.1088/0264-9381/31/2/025012 | AEI-2013-223 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Numerical-Relativity-Analytical-Relativity (NRAR) collaboration is a
joint effort between members of the numerical relativity, analytical relativity
and gravitational-wave data analysis communities. The goal of the NRAR
collaboration is to produce numerical-relativity simulations of compact
binaries and use them ... | [
{
"created": "Fri, 19 Jul 2013 19:07:43 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Sep 2013 12:54:57 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Dec 2013 16:05:06 GMT",
"version": "v3"
}
] | 2013-12-12 | [
[
"Hinder",
"Ian",
"",
"8 and 9"
],
[
"Buonanno",
"Alessandra",
"",
"8 and 9"
],
[
"Boyle",
"Michael",
"",
"8 and 9"
],
[
"Etienne",
"Zachariah B.",
"",
"8 and 9"
],
[
"Healy",
"James",
"",
"8 and 9"
],
[
"Johnso... | The Numerical-Relativity-Analytical-Relativity (NRAR) collaboration is a joint effort between members of the numerical relativity, analytical relativity and gravitational-wave data analysis communities. The goal of the NRAR collaboration is to produce numerical-relativity simulations of compact binaries and use them to... |
gr-qc/0611098 | Gerhard Hahne | G. E. Hahne | Schroedinger equation for joint bidirectional evolution in time:
astrophysical applications | 19 pages, 3 figures; augmented from paper published in the
Proceedings of the Symposium on "Frontiers of Time: Reverse
Causation--Experiment and Theory" (U. of San Diego, June 18--22, 2006; publ.
AIP Press, 2006) | AIPConf.Proc.863:44-61,2006 | 10.1063/1.2388747 | null | gr-qc | null | The theoretical framework established in arXiv:quant-ph/0404103 is extended
to deal with possible astrophysical manifestations of phenomena involving
reverse, as well as forward, causation in time. The basic idea is that
space-time comprises the direct sum of a number of quantized fields, including
a distinct physica... | [
{
"created": "Sat, 18 Nov 2006 00:39:27 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Hahne",
"G. E.",
""
]
] | The theoretical framework established in arXiv:quant-ph/0404103 is extended to deal with possible astrophysical manifestations of phenomena involving reverse, as well as forward, causation in time. The basic idea is that space-time comprises the direct sum of a number of quantized fields, including a distinct physical ... |
gr-qc/0409024 | Balakin Alexander | Alexander B. Balakin | Curvature Coupling and Accelerated Expansion of the Universe | 12 pages, no figures | Gen.Rel.Grav. 36 (2004) 1513-1525 | 10.1023/B:GERG.0000032144.79593.51 | null | gr-qc astro-ph hep-ph hep-th | null | A new exactly solvable model for the evolution of relativistic kinetic system
interacting with an internal stochastic reservoir under the influence of a
gravitational background expansion is established. This model of
self-interaction is based on the relativistic kinetic equation for the
distribution function defined... | [
{
"created": "Mon, 6 Sep 2004 14:02:10 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Balakin",
"Alexander B.",
""
]
] | A new exactly solvable model for the evolution of relativistic kinetic system interacting with an internal stochastic reservoir under the influence of a gravitational background expansion is established. This model of self-interaction is based on the relativistic kinetic equation for the distribution function defined i... |
1904.01075 | V. Sreenath | Vijayakumar Sreenath, Ivan Agullo and Boris Bolliet | Computation of non-Gaussianity in loop quantum cosmology | 6 pages, 3 figures; to appear in the Proceedings of the Fifteenth
Marcel Grossmann Meeting on General Relativity held at University of Rome "La
Sapienza", Rome from July 1-7, 2018 | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize our investigations of the second-order perturbations in loop
quantum cosmology (LQC). We shall discuss, primarily, two aspects. Firstly,
whether the second-order contributions arising from the cosmic bounce,
occurring at Planck scale, could be large enough to break the validity of
perturbation theory. Se... | [
{
"created": "Mon, 1 Apr 2019 19:28:10 GMT",
"version": "v1"
}
] | 2019-04-03 | [
[
"Sreenath",
"Vijayakumar",
""
],
[
"Agullo",
"Ivan",
""
],
[
"Bolliet",
"Boris",
""
]
] | We summarize our investigations of the second-order perturbations in loop quantum cosmology (LQC). We shall discuss, primarily, two aspects. Firstly, whether the second-order contributions arising from the cosmic bounce, occurring at Planck scale, could be large enough to break the validity of perturbation theory. Seco... |
2405.04690 | Michael Katz | Michael L. Katz, Nikolaos Karnesis, Natalia Korsakova, Jonathan R.
Gair, Nikolaos Stergioulas | An efficient GPU-accelerated multi-source global fit pipeline for LISA
data analysis | 25 pages, 6 figures | null | null | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The large-scale analysis task of deciphering gravitational wave signals in
the LISA data stream will be difficult, requiring a large amount of
computational resources and extensive development of computational methods. Its
high dimensionality, multiple model types, and complicated noise profile
require a global fit t... | [
{
"created": "Tue, 7 May 2024 22:04:53 GMT",
"version": "v1"
}
] | 2024-05-09 | [
[
"Katz",
"Michael L.",
""
],
[
"Karnesis",
"Nikolaos",
""
],
[
"Korsakova",
"Natalia",
""
],
[
"Gair",
"Jonathan R.",
""
],
[
"Stergioulas",
"Nikolaos",
""
]
] | The large-scale analysis task of deciphering gravitational wave signals in the LISA data stream will be difficult, requiring a large amount of computational resources and extensive development of computational methods. Its high dimensionality, multiple model types, and complicated noise profile require a global fit to ... |
2408.05569 | Di Wu | Wentao Liu, Di Wu, Jieci Wang | Light rings and shadows of static black holes in effective quantum
gravity | 9 pages, 8 figures, revtex4-1.cls. arXiv admin note: text overlap
with arXiv:2407.07416 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, two types of static black hole models that retain general
covariance have been proposed within the Hamiltonian constraint approach to
effective quantum gravity (EQG). We have studied the light rings and shadows of
these black holes using the topological method and the backward ray-tracing
method, respective... | [
{
"created": "Sat, 10 Aug 2024 14:44:21 GMT",
"version": "v1"
}
] | 2024-08-13 | [
[
"Liu",
"Wentao",
""
],
[
"Wu",
"Di",
""
],
[
"Wang",
"Jieci",
""
]
] | Recently, two types of static black hole models that retain general covariance have been proposed within the Hamiltonian constraint approach to effective quantum gravity (EQG). We have studied the light rings and shadows of these black holes using the topological method and the backward ray-tracing method, respectively... |
gr-qc/9903005 | Philip Mannheim | Philip D. Mannheim (U. Connecticut) | Cosmic acceleration and a natural solution to the cosmological constant
problem | RevTeX, 14 pages (updated version v2, conclusions unchanged). To
appear in proceedings of "The Role of Attractive and Repulsive Gravitational
Forces in Cosmic Acceleration of Particles, and the Origin of Cosmic Gamma
Rays Bursts", Orbis Scientiae 2000, Dec. 2000, B. N. Kursunoglu (Ed.), Kluwer
Academic/Plenum P... | null | null | null | gr-qc astro-ph hep-ph | null | We trace the origin of the cosmological constant problem to the assumption
that Newton's constant $G$ sets the scale for cosmology. And then we show that
once this assumption is relaxed, the very same cosmic acceleration which has
served to make the cosmological constant problem so very severe instead then
serves to ... | [
{
"created": "Mon, 1 Mar 1999 20:48:32 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Feb 2001 20:41:06 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Mannheim",
"Philip D.",
"",
"U. Connecticut"
]
] | We trace the origin of the cosmological constant problem to the assumption that Newton's constant $G$ sets the scale for cosmology. And then we show that once this assumption is relaxed, the very same cosmic acceleration which has served to make the cosmological constant problem so very severe instead then serves to pr... |
gr-qc/0702150 | Abel Camacho Mr. | A. Camacho and A. Macias | Thermodynamics of a photon gas and deformed dispersion relations | Accepted in General Relativity and Gravitation. Dedicated to O.
Obregon on ocassion of his 60th. birthday | Gen.Rel.Grav.39:1175-1183,2007 | 10.1007/s10714-007-0419-1 | null | gr-qc | null | We resort to the methods of statistical mechanics in order to determine the
effects that a deformed dispersion relation has upon the thermodynamics of a
photon gas. The ensuing modifications to the density of states, partition
function, pressure, internal energy, entropy, and specific heat are calculated.
It will be ... | [
{
"created": "Wed, 28 Feb 2007 18:51:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Camacho",
"A.",
""
],
[
"Macias",
"A.",
""
]
] | We resort to the methods of statistical mechanics in order to determine the effects that a deformed dispersion relation has upon the thermodynamics of a photon gas. The ensuing modifications to the density of states, partition function, pressure, internal energy, entropy, and specific heat are calculated. It will be sh... |
gr-qc/0010082 | Samuel Picton Drake | S. P. Drake | The Formation of non-Keplerian Rings of Matter about Compact Stars | 19 pages, 7 figures, 1 diagram. Figures are included in the text
using the "graphicx" package. If you do not have this package you can use
epsfig, or another package as long as you alter the tex file appropriately.
Alternatively you could print the figures out seperately | Gen.Rel.Grav. 35 (2003) 43-58 | 10.1023/A:1021350827384 | null | gr-qc astro-ph | null | The formation of energetic rings of matter in a Kerr spacetime with an
outward pointing acceleration field does not appear to have previously been
noted as a relativistic effect. In this paper we show that such rings are a
gravimagneto effect with no Newtonian analog, and that they do not occur in the
static limit. T... | [
{
"created": "Mon, 23 Oct 2000 04:00:53 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Drake",
"S. P.",
""
]
] | The formation of energetic rings of matter in a Kerr spacetime with an outward pointing acceleration field does not appear to have previously been noted as a relativistic effect. In this paper we show that such rings are a gravimagneto effect with no Newtonian analog, and that they do not occur in the static limit. The... |
gr-qc/9712038 | Brandon Carter | Brandon Carter | Has the black hole equilibrium problem been solved? | 28 pages Latex. Invited contribution to MG8 meeting, Jerusalem 1997 | null | null | null | gr-qc | null | When the term ``black hole'' was originally coined in 1968, it was
immediately conjectured that the only pure vacuum equilibrium states were those
of the Kerr family. Efforts to confirm this made rapid progress during the
``classical phase'' from 1968 to 1975, and some gaps in the argument have been
closed during mor... | [
{
"created": "Mon, 8 Dec 1997 12:53:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Carter",
"Brandon",
""
]
] | When the term ``black hole'' was originally coined in 1968, it was immediately conjectured that the only pure vacuum equilibrium states were those of the Kerr family. Efforts to confirm this made rapid progress during the ``classical phase'' from 1968 to 1975, and some gaps in the argument have been closed during more ... |
2303.01398 | John Paul Bernaldez | John Paul Bernaldez and Sayak Datta | Eccentricity-tide coupling: impact on binary neutron stars and extreme
mass-ratio inspirals | null | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We study the effect of tidal interaction between two compact bodies in an
eccentric orbit. We assume the tidal fields to be static. Therefore, we ignore
the dynamic tides and resonant excitations. Using the results, we find the
analytical expression for the phase shift of the emitted gravitational wave. In
the proces... | [
{
"created": "Thu, 2 Mar 2023 16:33:10 GMT",
"version": "v1"
}
] | 2023-03-03 | [
[
"Bernaldez",
"John Paul",
""
],
[
"Datta",
"Sayak",
""
]
] | We study the effect of tidal interaction between two compact bodies in an eccentric orbit. We assume the tidal fields to be static. Therefore, we ignore the dynamic tides and resonant excitations. Using the results, we find the analytical expression for the phase shift of the emitted gravitational wave. In the process,... |
1501.04170 | Julio Cesar Fabris | C.R. Almeida, A.B. Batista, J.C. Fabris, P.R.L.V. Moniz | Quantum cosmology with scalar fields: self-adjointness and cosmological
scenarios | Latex file, 17 pages | null | 10.1134/S0202289315030020 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the issue of unitarity in particular quantum cosmological models
with scalar field. The time variable is recovered, in this context, by using
the Schutz's formalism for a radiative fluid. Two cases are considered: a
phantom scalar field and an ordinary scalar field. For the first case, it is
shown that the... | [
{
"created": "Sat, 17 Jan 2015 07:42:23 GMT",
"version": "v1"
}
] | 2015-09-23 | [
[
"Almeida",
"C. R.",
""
],
[
"Batista",
"A. B.",
""
],
[
"Fabris",
"J. C.",
""
],
[
"Moniz",
"P. R. L. V.",
""
]
] | We discuss the issue of unitarity in particular quantum cosmological models with scalar field. The time variable is recovered, in this context, by using the Schutz's formalism for a radiative fluid. Two cases are considered: a phantom scalar field and an ordinary scalar field. For the first case, it is shown that the e... |
2110.03291 | Chen Songbai | Xuan Zhou, Songbai Chen, Jiliang Jing | Effect of noncircularity on the dynamic behaviors of particles in a
disformal rotating black-hole spacetime | 15 pages, 8 figures, title is modified and the version is published
in SCPMA | Sci. China-Phys. Mech. Astron.65 (5), 250411 (2022) | 10.1007/s11433-021-1865-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A disformal rotating black-hole solution is a black-hole solution in
quadratic degenerate higher-order scalar-tensor theories. It breaks the
circular condition of spacetime different from the case of the usual Kerr
spacetime. This study investigated the dynamic behaviors of the motion of
timelike particles in such di... | [
{
"created": "Thu, 7 Oct 2021 09:24:19 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Mar 2022 09:55:10 GMT",
"version": "v2"
}
] | 2022-03-24 | [
[
"Zhou",
"Xuan",
""
],
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | A disformal rotating black-hole solution is a black-hole solution in quadratic degenerate higher-order scalar-tensor theories. It breaks the circular condition of spacetime different from the case of the usual Kerr spacetime. This study investigated the dynamic behaviors of the motion of timelike particles in such disf... |
gr-qc/0007032 | Dinesh Singh | D. Singh and G. Papini | Spin-1/2 Particles in Non-Inertial Reference Frames: Low- and
High-Energy Approximations | LaTeX file, 23 pages. Presented at Marcel Grossmann IX Conference,
Section GT8. Please note that eqs. (3.18) and (3.22) have been corrected for
typos found in the refereed paper | Nuovo Cim. B115 (2000) 223 | null | null | gr-qc hep-th | null | Spin-1/2 particles can be used to study inertial and gravitational effects by
means of interferometers, particle accelerators, and ultimately quantum
systems. These studies require, in general, knowledge of the Hamiltonian and of
the inertial and gravitational quantum phases. The procedure followed gives
both in the ... | [
{
"created": "Fri, 14 Jul 2000 20:22:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Singh",
"D.",
""
],
[
"Papini",
"G.",
""
]
] | Spin-1/2 particles can be used to study inertial and gravitational effects by means of interferometers, particle accelerators, and ultimately quantum systems. These studies require, in general, knowledge of the Hamiltonian and of the inertial and gravitational quantum phases. The procedure followed gives both in the lo... |
1501.05259 | Thomas W. Baumgarte | Thomas W. Baumgarte, Pedro J. Montero and Ewald M\"uller | Numerical Relativity in Spherical Polar Coordinates: Off-center
Simulations | 13 pages, 11 figures; matches version published in PRD | null | 10.1103/PhysRevD.91.064035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have recently presented a new approach for numerical relativity
simulations in spherical polar coordinates, both for vacuum and for
relativistic hydrodynamics. Our approach is based on a reference-metric
formulation of the BSSN equations, a factoring of all tensor components, as
well as a partially implicit Runge-... | [
{
"created": "Wed, 21 Jan 2015 18:52:20 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jun 2015 12:54:32 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Baumgarte",
"Thomas W.",
""
],
[
"Montero",
"Pedro J.",
""
],
[
"Müller",
"Ewald",
""
]
] | We have recently presented a new approach for numerical relativity simulations in spherical polar coordinates, both for vacuum and for relativistic hydrodynamics. Our approach is based on a reference-metric formulation of the BSSN equations, a factoring of all tensor components, as well as a partially implicit Runge-Ku... |
1503.01849 | Reece Boston | S. Reece Boston | Anti-telephones in transformation optics: metamaterials with closed null
geodesics | Submitted to Phys Rev D. This is a pre-print, uploaded here in hopes
of wider review and community feedback | null | 10.1103/PhysRevD.91.124035 | null | gr-qc cond-mat.other physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the methods of transformation optics to theoretical descriptions of
spacetimes that support closed null geodesic curves. The metric used is based
on frame dragging spacetimes, such as the van Stockum dust or the Kerr black
hole. Through transformation optics, this metric is analogous to a material
that in th... | [
{
"created": "Fri, 6 Mar 2015 05:11:17 GMT",
"version": "v1"
}
] | 2023-07-24 | [
[
"Boston",
"S. Reece",
""
]
] | We apply the methods of transformation optics to theoretical descriptions of spacetimes that support closed null geodesic curves. The metric used is based on frame dragging spacetimes, such as the van Stockum dust or the Kerr black hole. Through transformation optics, this metric is analogous to a material that in theo... |
gr-qc/0006102 | J. Alberto Lobo | J. Alberto Lobo | What can we learn about GW Physics with an elastic spherical antenna? | 21 pages, 7 figures, REVTeX, enhanced Appendix B with numerical
values and mathematical detail. See also gr-qc/0006055 | Phys.Rev. D52 (1995) 591 | 10.1103/PhysRevD.52.591 | null | gr-qc | null | A general formalism is set up to analyse the response of an arbitrary solid
elastic body to an arbitrary metric Gravitational Wave perturbation, which
fully displays the details of the interaction antenna-wave. The formalism is
applied to the spherical detector, whose sensitivity parameters are thereby
scrutinised. A... | [
{
"created": "Thu, 29 Jun 2000 07:40:51 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Lobo",
"J. Alberto",
""
]
] | A general formalism is set up to analyse the response of an arbitrary solid elastic body to an arbitrary metric Gravitational Wave perturbation, which fully displays the details of the interaction antenna-wave. The formalism is applied to the spherical detector, whose sensitivity parameters are thereby scrutinised. A m... |
2012.06939 | Ohkyung Kwon | Jonathan W. Richardson, Ohkyung Kwon, H. Richard Gustafson, Craig
Hogan, Brittany L. Kamai, Lee P. McCuller, Stephan S. Meyer, Chris Stoughton,
Raymond E. Tomlin, and Rainer Weiss | Interferometric Constraints on Spacelike Coherent Rotational
Fluctuations | 9 pages, 4 figures. PRL accepted manuscript | Phys. Rev. Lett. 126, 241301 (2021) | 10.1103/PhysRevLett.126.241301 | FERMILAB-PUB-20-558-E | gr-qc hep-ex physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Precision measurements are reported of the cross-spectrum of
rotationally-induced differential position displacements in a pair of colocated
39 m long, high power Michelson interferometers. One arm of each interferometer
is bent $90^{\circ}$ near its midpoint to obtain sensitivity to rotations about
an axis normal to... | [
{
"created": "Sun, 13 Dec 2020 01:28:49 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2021 16:49:15 GMT",
"version": "v2"
}
] | 2021-06-21 | [
[
"Richardson",
"Jonathan W.",
""
],
[
"Kwon",
"Ohkyung",
""
],
[
"Gustafson",
"H. Richard",
""
],
[
"Hogan",
"Craig",
""
],
[
"Kamai",
"Brittany L.",
""
],
[
"McCuller",
"Lee P.",
""
],
[
"Meyer",
"Stephan S.",
... | Precision measurements are reported of the cross-spectrum of rotationally-induced differential position displacements in a pair of colocated 39 m long, high power Michelson interferometers. One arm of each interferometer is bent $90^{\circ}$ near its midpoint to obtain sensitivity to rotations about an axis normal to t... |
1511.03396 | Andrej Arbuzov | A.B. Arbuzov, A.Yu. Cherny, D.J. Cirilo-Lombardo, R.G. Nazmitdinov,
Nguyen Suan Han, A.E. Pavlov, V.N. Pervushin, A.F. Zakharov | Von Neumann's Quantization of General Relativity | 14 pages, updated version with extended discussion | Phys. Atom. Nucl. 80, no.3, 491-504 (2017) | 10.1134/S106377881702003X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Von Neumann's procedure is applied for quantization of General Relativity. We
quantize the initial data of dynamical variables at the Planck epoch, where the
Hubble parameter coincides with the Planck mass. These initial data are defined
via the Fock simplex in the tangent Minkowskian space-time and the Dirac
conform... | [
{
"created": "Wed, 11 Nov 2015 06:22:34 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Apr 2016 08:05:50 GMT",
"version": "v2"
}
] | 2017-08-11 | [
[
"Arbuzov",
"A. B.",
""
],
[
"Cherny",
"A. Yu.",
""
],
[
"Cirilo-Lombardo",
"D. J.",
""
],
[
"Nazmitdinov",
"R. G.",
""
],
[
"Han",
"Nguyen Suan",
""
],
[
"Pavlov",
"A. E.",
""
],
[
"Pervushin",
"V. N.",
""
... | Von Neumann's procedure is applied for quantization of General Relativity. We quantize the initial data of dynamical variables at the Planck epoch, where the Hubble parameter coincides with the Planck mass. These initial data are defined via the Fock simplex in the tangent Minkowskian space-time and the Dirac conformal... |
0806.1537 | Andr\'e da Silva Ricardo Rocha | Luis C. B. Crispino, Andre R. R. da Silva and George E. A. Matsas | Scalar radiation emitted from a rotating source around a
Reissner-Nordstrom black hole | 7 pages, 9 figures, submitted to Phys. Rev. D | Phys.Rev.D79:024004,2009 | 10.1103/PhysRevD.79.024004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the radiation emitted from a scalar source in circular orbit
around a Reissner-Nordstrom black hole. Particle and energy emission rates are
analytically calculated in the low- and high-frequency regimes and shown to be
in full agreement with a numerical calculation. Our investigation is connected
with ... | [
{
"created": "Mon, 9 Jun 2008 21:02:53 GMT",
"version": "v1"
}
] | 2009-01-16 | [
[
"Crispino",
"Luis C. B.",
""
],
[
"da Silva",
"Andre R. R.",
""
],
[
"Matsas",
"George E. A.",
""
]
] | We investigate the radiation emitted from a scalar source in circular orbit around a Reissner-Nordstrom black hole. Particle and energy emission rates are analytically calculated in the low- and high-frequency regimes and shown to be in full agreement with a numerical calculation. Our investigation is connected with th... |
gr-qc/0311090 | Suresh Maran k | Suresh K. Maran | Relating Spin Foams and Canonical Quantum Gravity: A Discrete Step
Evolution Formulation of Spin Foams | This article has been replaced by gr-qc/0412011 | null | 10.1103/PhysRevD.70.124004 | null | gr-qc | null | This article has been replaced by gr-qc/0412011
| [
{
"created": "Thu, 27 Nov 2003 21:16:16 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Nov 2003 04:04:06 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Feb 2004 02:11:00 GMT",
"version": "v3"
},
{
"created": "Wed, 31 Mar 2004 01:30:18 GMT",
"version": "v4"
},
{
"c... | 2013-05-29 | [
[
"Maran",
"Suresh K.",
""
]
] | This article has been replaced by gr-qc/0412011 |
1506.08695 | Gamal G.L. Nashed | G. G. L. Nashed | FRW in quadratic form of $f(T)$ gravitational theories | 15 pages Latex, 4 figurs. arXiv admin note: substantial text overlap
with arXiv:1403.0913, arXiv:1411.3293; text overlap with arXiv:1501.00621,
arXiv:1501.02198, arXiv:1501.00103 by other authors | Gen Relativ Gravit (2015) 47:75 | 10.1007/s10714-015-1917-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive asymptote solution of a homogeneous and isotropic universe governed
by the quadratic form of the field equation of $f(T)$ gravity. We explain how
the higher order of the torsion can provide an origin for late accelerated
phase of the universe in the FRW. The solution makes the scalar torsion $T$ to
be a fun... | [
{
"created": "Fri, 26 Jun 2015 10:14:51 GMT",
"version": "v1"
}
] | 2015-06-30 | [
[
"Nashed",
"G. G. L.",
""
]
] | We derive asymptote solution of a homogeneous and isotropic universe governed by the quadratic form of the field equation of $f(T)$ gravity. We explain how the higher order of the torsion can provide an origin for late accelerated phase of the universe in the FRW. The solution makes the scalar torsion $T$ to be a funct... |
gr-qc/0003073 | Mario Novello | M. Novello, V. A. De Lorenci, E. Elbaz and J. M. Salim | Closed Lightlike Curves in Non-linear Electrodynamics | null | null | null | null | gr-qc | null | We show that non-linear electrodynamics may induce a photon to follow a
closed path in spacetime. We exhibit a specific case in which such closed
lightlike curve (CLC) appears
| [
{
"created": "Fri, 17 Mar 2000 18:39:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Novello",
"M.",
""
],
[
"De Lorenci",
"V. A.",
""
],
[
"Elbaz",
"E.",
""
],
[
"Salim",
"J. M.",
""
]
] | We show that non-linear electrodynamics may induce a photon to follow a closed path in spacetime. We exhibit a specific case in which such closed lightlike curve (CLC) appears |
gr-qc/9412045 | Imtjj51 | A.L\'opez--Pinto, A.Tiemblo and R.Tresguerres | Ordinary Matter in Nonlinear Affine Gauge Theories of Gravitation | 17 pages, plainTeX | Class.Quant.Grav.12:1503-1516,1995 | 10.1088/0264-9381/12/6/016 | IMAFF 94/7 | gr-qc | null | We present a general framework to include ordinary fermionic matter in the
metric--affine gauge theories of gravity. It is based on a nonlinear gauge
realization of the affine group, with the Lorentz group as the classification
subgroup of the matter and gravitational fields.
| [
{
"created": "Fri, 16 Dec 1994 10:52:49 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"López--Pinto",
"A.",
""
],
[
"Tiemblo",
"A.",
""
],
[
"Tresguerres",
"R.",
""
]
] | We present a general framework to include ordinary fermionic matter in the metric--affine gauge theories of gravity. It is based on a nonlinear gauge realization of the affine group, with the Lorentz group as the classification subgroup of the matter and gravitational fields. |
1906.05258 | Wojciech Kami\'nski | Wojciech Kaminski and Hanno Sahlmann | The hessian in spin foam models | 30 pages | null | 10.1007/s00023-019-00839-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We fill one of the remaining gaps in the asymptotic analysis of the vertex
amplitudes of the Engle-Pereira-Rovelli-Livine (EPRL) spin foam models: We show
that the hessian is nondegenerate for the stationary points that corresponds to
geometric nondegenerate $4$ simplices. Our analysis covers the case when all
faces ... | [
{
"created": "Wed, 12 Jun 2019 17:32:13 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Kaminski",
"Wojciech",
""
],
[
"Sahlmann",
"Hanno",
""
]
] | We fill one of the remaining gaps in the asymptotic analysis of the vertex amplitudes of the Engle-Pereira-Rovelli-Livine (EPRL) spin foam models: We show that the hessian is nondegenerate for the stationary points that corresponds to geometric nondegenerate $4$ simplices. Our analysis covers the case when all faces ar... |
2005.05801 | Z. Yousaf | M. Z. Bhatti, Z. Yousaf, A. Khadim | Dynamical Analysis of Self-gravitating Stars in Modified Gauss-Bonnet
Gravity | 25 pages, no figure, version accepted for publication in Physical
Review D | Phys. Rev. D 101, 104029 (2020) | 10.1103/PhysRevD.101.104029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have continued the work of Herrera \emph{et al.}
\cite{herrera2012dynamical} in $f(G)$ gravitational theory. For this purpose, a
spherically symmetric fluid exhibiting locally anisotropic pressure along with
the energy density, is taken under consideration. The perturbation scheme is
imposed on modi... | [
{
"created": "Sun, 10 May 2020 06:04:05 GMT",
"version": "v1"
}
] | 2020-05-19 | [
[
"Bhatti",
"M. Z.",
""
],
[
"Yousaf",
"Z.",
""
],
[
"Khadim",
"A.",
""
]
] | In this paper, we have continued the work of Herrera \emph{et al.} \cite{herrera2012dynamical} in $f(G)$ gravitational theory. For this purpose, a spherically symmetric fluid exhibiting locally anisotropic pressure along with the energy density, is taken under consideration. The perturbation scheme is imposed on modifi... |
2104.14013 | Christof Wetterich | C. Wetterich | Cosmology from pregeometry | Further explanations, new references, 63 pages, 9 figures | null | 10.1103/PhysRevD.104.104040 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss cosmological solutions for a diffeomorphism invariant gauge theory
of the non-compact Lorentz group $SO(1,3)$. Besides the gauge bosons our model
of pregeometry contains a vector field in the vector representation of
$SO(1,3)$ and a scalar singlet. General relativity and variable gravity emerge
as effectiv... | [
{
"created": "Wed, 28 Apr 2021 20:44:31 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Nov 2021 14:32:38 GMT",
"version": "v2"
}
] | 2021-12-01 | [
[
"Wetterich",
"C.",
""
]
] | We discuss cosmological solutions for a diffeomorphism invariant gauge theory of the non-compact Lorentz group $SO(1,3)$. Besides the gauge bosons our model of pregeometry contains a vector field in the vector representation of $SO(1,3)$ and a scalar singlet. General relativity and variable gravity emerge as effective ... |
2008.04468 | Ednilton S. de Oliveira Ph.D. | E. S. de Oliveira | Scalar absorption cross section of rotating black holes with tidal
charge | null | null | 10.1103/PhysRevD.104.124008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The absorption cross section of rotating black holes in the Randall-Sundrum
brane-world scenario for massless scalar waves is obtained via the partial-wave
method. A variety of incidence directions with respect to the black hole
rotation axis is considered. Special attention is given to near-extreme black
holes, in w... | [
{
"created": "Tue, 11 Aug 2020 01:19:48 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Aug 2020 17:28:01 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Dec 2020 22:29:31 GMT",
"version": "v3"
}
] | 2021-12-15 | [
[
"de Oliveira",
"E. S.",
""
]
] | The absorption cross section of rotating black holes in the Randall-Sundrum brane-world scenario for massless scalar waves is obtained via the partial-wave method. A variety of incidence directions with respect to the black hole rotation axis is considered. Special attention is given to near-extreme black holes, in whi... |
gr-qc/0405108 | Jacek Jezierski | Jacek Jezierski | Geometry of null hypersurfaces | 10 pages | in Relativity Today (Proc. 7th Hungarian Relativity Workshop,
2003) Ed. I. Racz, (Akad\'emiai Kiad\'o, Budapest, 2004) | null | null | gr-qc | null | We review some basic natural geometric objects on null hypersurfaces.
Gauss-Codazzi constraints are given in terms of the analog of canonical ADM
momentum which is a well defined tensor density on the null surface. Bondi
cones are analyzed with the help of this object.
| [
{
"created": "Wed, 19 May 2004 14:10:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jezierski",
"Jacek",
""
]
] | We review some basic natural geometric objects on null hypersurfaces. Gauss-Codazzi constraints are given in terms of the analog of canonical ADM momentum which is a well defined tensor density on the null surface. Bondi cones are analyzed with the help of this object. |
0812.4302 | Vivien Raymond | V. Raymond, M.V. van der Sluys, I. Mandel, V. Kalogera, C. Roever, N.
Christensen | Degeneracies in Sky Localisation Determination from a Spinning
Coalescing Binary through Gravitational Wave Observations: a Markov-Chain
Monte-Carlo Analysis for two Detectors | 14 pages, 5 figures, 2 tables. Proceeding's paper for the NRDA 2008
conference | Class.Quant.Grav.26:114007,2009 | 10.1088/0264-9381/26/11/114007 | null | gr-qc astro-ph.CO physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational-wave signals from inspirals of binary compact objects (black
holes and neutron stars) are primary targets of the ongoing searches by
ground-based gravitational-wave interferometers (LIGO, Virgo, and GEO-600). We
present parameter-estimation simulations for inspirals of
black-hole--neutron-star binaries ... | [
{
"created": "Mon, 22 Dec 2008 23:51:14 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Apr 2009 18:06:33 GMT",
"version": "v2"
}
] | 2009-11-04 | [
[
"Raymond",
"V.",
""
],
[
"van der Sluys",
"M. V.",
""
],
[
"Mandel",
"I.",
""
],
[
"Kalogera",
"V.",
""
],
[
"Roever",
"C.",
""
],
[
"Christensen",
"N.",
""
]
] | Gravitational-wave signals from inspirals of binary compact objects (black holes and neutron stars) are primary targets of the ongoing searches by ground-based gravitational-wave interferometers (LIGO, Virgo, and GEO-600). We present parameter-estimation simulations for inspirals of black-hole--neutron-star binaries us... |
1302.3341 | Hyeong-Chan Kim | Inyong Cho and Hyeong-Chan Kim | A new synthesis of matter and gravity: A nongravitating scalar field | 6pages, 2 figures,title changed, add comments on general gravity
theories | Physical Review D 88, 064038 (2013) | 10.1103/PhysRevD.88.064038 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new manifestation of the nonlinearity of the gravity-matter
interactions. We show explicitly that there exists a nongravitating dynamical
scalar-field solution in Eddington-inspired Born-Infeld gravity. This kind of
solution has not been found in previous literatures based on general
relativity, or other... | [
{
"created": "Thu, 14 Feb 2013 08:48:27 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2013 07:06:56 GMT",
"version": "v2"
}
] | 2014-06-17 | [
[
"Cho",
"Inyong",
""
],
[
"Kim",
"Hyeong-Chan",
""
]
] | We present a new manifestation of the nonlinearity of the gravity-matter interactions. We show explicitly that there exists a nongravitating dynamical scalar-field solution in Eddington-inspired Born-Infeld gravity. This kind of solution has not been found in previous literatures based on general relativity, or other m... |
gr-qc/9610059 | Jai-chan Hwang | H. Noh and J. Hwang | Cosmological Gravitational Wave in a Gravity with Quadratic Order
Curvature Couplings | 4 pages, revtex, no figures | Phys.Rev.D55:5222-5225,1997 | 10.1103/PhysRevD.55.5222 | null | gr-qc | null | We present a set of equations describing the cosmological gravitational wave
in a gravity theory with quadratic order gravitational coupling terms which
naturally arise in quantum correction procedures. It is known that the
gravitational wave equation in the gravity theories with a general $f(R)$ term
in the action l... | [
{
"created": "Fri, 25 Oct 1996 04:09:38 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Noh",
"H.",
""
],
[
"Hwang",
"J.",
""
]
] | We present a set of equations describing the cosmological gravitational wave in a gravity theory with quadratic order gravitational coupling terms which naturally arise in quantum correction procedures. It is known that the gravitational wave equation in the gravity theories with a general $f(R)$ term in the action lea... |
1010.4117 | Xin-Zhou Li | Xi-chen Ao, Xin-zhou Li and Ping Xi | Analytical approach of late-time evolution in a torsion cosmology | 12pages,6 figures | Phys. Lett.B694:186-190, 2010 | 10.1016/j.physletb.2010.09.060 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter, we study the late-time evolution of a torsion cosmology only
with the spin-$0^+$ mode. We find three kinds of analytical solutions with a
constant affine scalar curvature. In the first case, it is not physical because
the matter density will be negative. In the second case, it shows that the dark
ener... | [
{
"created": "Wed, 20 Oct 2010 07:58:41 GMT",
"version": "v1"
}
] | 2019-08-17 | [
[
"Ao",
"Xi-chen",
""
],
[
"Li",
"Xin-zhou",
""
],
[
"Xi",
"Ping",
""
]
] | In this letter, we study the late-time evolution of a torsion cosmology only with the spin-$0^+$ mode. We find three kinds of analytical solutions with a constant affine scalar curvature. In the first case, it is not physical because the matter density will be negative. In the second case, it shows that the dark energy... |
2209.07398 | Zbigniew Haba | Z.Haba | Quantum scalar field propagator in a stochastic gravitational plane wave | 14 pages,substantially revised version | Universe 2022,8,648 | 10.3390/universe8120648 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | A stochastic metric can appear in classical as well as in quantum gravity. We
show that if the linearized stochastic Gaussian gravitational plane wave has
the frequency spectrum $\omega^{4\gamma-1}$ ($0\leq \gamma<1$) then the
equal-time propagator of the scalar field behaves as
$p^{-\frac{1}{1-\gamma}}$for large mom... | [
{
"created": "Thu, 15 Sep 2022 15:58:13 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Dec 2022 15:16:38 GMT",
"version": "v2"
}
] | 2022-12-07 | [
[
"Haba",
"Z.",
""
]
] | A stochastic metric can appear in classical as well as in quantum gravity. We show that if the linearized stochastic Gaussian gravitational plane wave has the frequency spectrum $\omega^{4\gamma-1}$ ($0\leq \gamma<1$) then the equal-time propagator of the scalar field behaves as $p^{-\frac{1}{1-\gamma}}$for large momen... |
1601.07370 | Babar Qureshi | A P Balachandran and Babar Qureshi | ADM Energy and Infra-gravitons | Title and abstract slightly changed to match with published article.
Some changes in the text and addition of remarks | Phys.Lett. B766 (2017) 132-136 | 10.1016/j.physletb.2017.01.003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In QED and QCD [1, 2], infrared photons and gluons alter the Hilbert space of
the theory so that the in and out states live in a Hilbert space carrying a
representation of basic commutation relations which is non-equivalent to the
standard Fock representation, leading to spontaneous breakdown of Lorentz
symmetry and ... | [
{
"created": "Wed, 27 Jan 2016 13:51:55 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jan 2017 15:02:25 GMT",
"version": "v2"
}
] | 2017-01-18 | [
[
"Balachandran",
"A P",
""
],
[
"Qureshi",
"Babar",
""
]
] | In QED and QCD [1, 2], infrared photons and gluons alter the Hilbert space of the theory so that the in and out states live in a Hilbert space carrying a representation of basic commutation relations which is non-equivalent to the standard Fock representation, leading to spontaneous breakdown of Lorentz symmetry and ph... |
1109.2149 | Miguel Zilhao | Miguel Zilh\~ao, Marcus Ansorg, Vitor Cardoso, Leonardo Gualtieri,
Carlos Herdeiro, Ulrich Sperhake, Helvi Witek | Higher-dimensional puncture initial data | 11 pages, 3 figures; corrected typos, added one Table and other minor
changes. matches published version in PRD | Phys. Rev. D 84, 084039 (2011) | 10.1103/PhysRevD.84.084039 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate puncture initial data, corresponding to single and binary black
holes with linear momenta, which solve the constraint equations of D
dimensional vacuum gravity. The data are generated by a modification of the
pseudo-spectral code presented in arXiv:gr-qc/0404056 and made available as the
TwoPunctures tho... | [
{
"created": "Fri, 9 Sep 2011 20:33:52 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Oct 2011 12:40:48 GMT",
"version": "v2"
}
] | 2011-10-27 | [
[
"Zilhão",
"Miguel",
""
],
[
"Ansorg",
"Marcus",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Herdeiro",
"Carlos",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Witek",
"Helvi",
""
]
] | We calculate puncture initial data, corresponding to single and binary black holes with linear momenta, which solve the constraint equations of D dimensional vacuum gravity. The data are generated by a modification of the pseudo-spectral code presented in arXiv:gr-qc/0404056 and made available as the TwoPunctures thorn... |
2109.10288 | Arman Tursunov | Arman Tursunov, Bakhtinur Juraev, Zden\v{e}k Stuchl\'ik and Martin
Kolo\v{s} | Electric Penrose process: high-energy acceleration of ionized particles
by non-rotating weakly charged black hole | 8 pages, 4 figures, accepted to Phys. Rev. D | null | 10.1103/PhysRevD.104.084099 | null | gr-qc astro-ph.GA astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | In many astrophysical scenarios the charge of the black hole is often
neglected due to unrealistically large values of the charge required for the
Reissner-Nordstr\"om spacetime metric. However, black holes may possess small
electric charge due to various selective accretion mechanisms. In this paper we
investigate t... | [
{
"created": "Tue, 21 Sep 2021 16:09:38 GMT",
"version": "v1"
}
] | 2021-11-10 | [
[
"Tursunov",
"Arman",
""
],
[
"Juraev",
"Bakhtinur",
""
],
[
"Stuchlík",
"Zdeněk",
""
],
[
"Kološ",
"Martin",
""
]
] | In many astrophysical scenarios the charge of the black hole is often neglected due to unrealistically large values of the charge required for the Reissner-Nordstr\"om spacetime metric. However, black holes may possess small electric charge due to various selective accretion mechanisms. In this paper we investigate the... |
2008.04092 | Sanjar Shaymatov | Sanjar Shaymatov, Naresh Dadhich | Weak cosmic censorship conjecture in the pure Lovelock gravity | 12 pages, 1 captioned figure | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that a rotating black hole in four dimension could be
overspun by linear order test particle accretion which however always gets
overturned when non-linear perturbations are included. It turns out that in the
Einstein gravity, repulsion due to rotation dominates over attraction due to
mass in dimensi... | [
{
"created": "Mon, 10 Aug 2020 13:05:41 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Aug 2022 14:06:38 GMT",
"version": "v2"
}
] | 2022-08-04 | [
[
"Shaymatov",
"Sanjar",
""
],
[
"Dadhich",
"Naresh",
""
]
] | It is well known that a rotating black hole in four dimension could be overspun by linear order test particle accretion which however always gets overturned when non-linear perturbations are included. It turns out that in the Einstein gravity, repulsion due to rotation dominates over attraction due to mass in dimension... |
0909.4963 | Serguei Krasnikov | Serguei Krasnikov | Quasiregular singularities taken seriously | Lecture given at 5-th International School on Field Theory and
Gravitation in Brazil | PoS ISFTG2009:014,2009 | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss a special class of singularities obtained as a natural
4-dimensional generalization of the conical singularity. Such singularities
(called quasiregular) are ruinous for the predictive force of general
relativity, so one often assumes (implicitly as a rule) that they can be
somehow excluded from the theory. ... | [
{
"created": "Sun, 27 Sep 2009 20:06:24 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Krasnikov",
"Serguei",
""
]
] | I discuss a special class of singularities obtained as a natural 4-dimensional generalization of the conical singularity. Such singularities (called quasiregular) are ruinous for the predictive force of general relativity, so one often assumes (implicitly as a rule) that they can be somehow excluded from the theory. In... |
0906.3860 | Peter Dunsby | Naureen Goheer, Julien Larena and Peter K. S. Dunsby | Power-law cosmic expansion in f(R) gravity models | 4 pages, 2 figures | Phys.Rev.D80:061301,2009 | 10.1103/PhysRevD.80.061301 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that within the class of f(R) gravity theories, FLRW power-law
perfect fluid solutions only exist for R^n gravity. This significantly
restricts the set of exact cosmological solutions which have similar properties
to what is found in standard General Relativity.
| [
{
"created": "Sun, 21 Jun 2009 11:22:14 GMT",
"version": "v1"
}
] | 2009-09-24 | [
[
"Goheer",
"Naureen",
""
],
[
"Larena",
"Julien",
""
],
[
"Dunsby",
"Peter K. S.",
""
]
] | We show that within the class of f(R) gravity theories, FLRW power-law perfect fluid solutions only exist for R^n gravity. This significantly restricts the set of exact cosmological solutions which have similar properties to what is found in standard General Relativity. |
1908.05522 | Jani Kastikainen | Jani Kastikainen | Quasi-local energy and ADM mass in pure Lovelock gravity | 24 pages with two appendices; references added, minor changes to
abstract and text, updated to JHEP style | Classical and Quantum Gravity 37, 025001 (2020) | 10.1088/1361-6382/ab5dfa | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study how the standard definitions of ADM mass and Brown-York quasi-local
energy generalize to pure Lovelock gravity. The quasi-local energy is
renormalized using the background subtraction prescription and we consider its
limit for large surfaces. We find that the large surface limit vanishes for
asymptotically f... | [
{
"created": "Thu, 15 Aug 2019 13:11:42 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Sep 2019 13:07:19 GMT",
"version": "v2"
}
] | 2020-01-28 | [
[
"Kastikainen",
"Jani",
""
]
] | We study how the standard definitions of ADM mass and Brown-York quasi-local energy generalize to pure Lovelock gravity. The quasi-local energy is renormalized using the background subtraction prescription and we consider its limit for large surfaces. We find that the large surface limit vanishes for asymptotically fla... |
1405.0510 | Christos Tzounis | Valeri P. Frolov, Andrey A. Shoom and Christos Tzounis | Spectral line broadening in magnetized black holes | 16 pages, 9 figures. arXiv admin note: text overlap with
arXiv:1405.4899 | JCAP 1475-7516 2014 059 | 10.1088/1475-7516/2014/07/059 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider weakly magnetized non-rotating black holes. In the presence of a
regular magnetic field the motion of charged particles in the vicinity of a
black hole is modified. As a result, the position of the innermost stable
circular orbit (ISCO) becomes closer to the horizon. When the Lorentz force is
repulsive (d... | [
{
"created": "Fri, 2 May 2014 20:50:59 GMT",
"version": "v1"
},
{
"created": "Sat, 10 May 2014 17:07:47 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Jul 2014 17:25:14 GMT",
"version": "v3"
}
] | 2015-09-09 | [
[
"Frolov",
"Valeri P.",
""
],
[
"Shoom",
"Andrey A.",
""
],
[
"Tzounis",
"Christos",
""
]
] | We consider weakly magnetized non-rotating black holes. In the presence of a regular magnetic field the motion of charged particles in the vicinity of a black hole is modified. As a result, the position of the innermost stable circular orbit (ISCO) becomes closer to the horizon. When the Lorentz force is repulsive (dir... |
0712.1649 | Richard Obousy Mr | Richard Obousy, Gerald Cleaver | Warp Drive: A New Approach | 15 pages. To be published in JBIS | null | null | null | gr-qc | null | Certain classes of higher dimensional models suggest that the Casimir Effect
is a candidate for the cosmological constant. In this paper we demonstrate that
a sufficiently advanced civilization could, in principal, manipulate the radius
of the extra dimension to locally adjust the value of the cosmological
constant. ... | [
{
"created": "Tue, 11 Dec 2007 06:37:43 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Dec 2007 16:37:33 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Dec 2007 19:18:30 GMT",
"version": "v3"
},
{
"created": "Wed, 23 Jan 2008 04:26:48 GMT",
"version": "v4"
},
{
"c... | 2009-01-23 | [
[
"Obousy",
"Richard",
""
],
[
"Cleaver",
"Gerald",
""
]
] | Certain classes of higher dimensional models suggest that the Casimir Effect is a candidate for the cosmological constant. In this paper we demonstrate that a sufficiently advanced civilization could, in principal, manipulate the radius of the extra dimension to locally adjust the value of the cosmological constant. Th... |
1001.3964 | Hans-Thomas Elze | Hans-Thomas Elze | Spacetime and Matter - a duality of partial orders | Fourth prize in the 2009 FQXi essay contest "What is Ultimately
Possible in Physics?" | null | null | null | gr-qc physics.gen-ph physics.pop-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new kind of duality between the deep structures of spacetime and matter is
proposed here, considering two partial orders which incorporate causality,
extensity, and discreteness. This may have surprising consequences for the
emergence of quantum mechanics, which are discussed.
| [
{
"created": "Fri, 22 Jan 2010 11:31:47 GMT",
"version": "v1"
}
] | 2010-01-25 | [
[
"Elze",
"Hans-Thomas",
""
]
] | A new kind of duality between the deep structures of spacetime and matter is proposed here, considering two partial orders which incorporate causality, extensity, and discreteness. This may have surprising consequences for the emergence of quantum mechanics, which are discussed. |
1607.05637 | Kaushik Bhattacharya | Barnali Das, Kaushik Bhattacharya | Non-minimally coupled dark fluid in Schwarzschild spacetime | 22 pages, 4 figures, latex file. New material added, modifications
done and typos corrected | Gen Relativ Gravit (2017) 49:63 | 10.1007/s10714-017-2226-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If one assumes a particular form of non-minimal coupling, called the
conformal coupling, of a perfect fluid with gravity in the fluid-gravity
Lagrangian then one gets modified Einstein field equation. In the modified
Einstein equation, the effect of the non-minimal coupling does not vanish if
one works with spacetime... | [
{
"created": "Tue, 19 Jul 2016 15:38:34 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jul 2016 07:21:51 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Apr 2017 07:23:24 GMT",
"version": "v3"
}
] | 2017-04-10 | [
[
"Das",
"Barnali",
""
],
[
"Bhattacharya",
"Kaushik",
""
]
] | If one assumes a particular form of non-minimal coupling, called the conformal coupling, of a perfect fluid with gravity in the fluid-gravity Lagrangian then one gets modified Einstein field equation. In the modified Einstein equation, the effect of the non-minimal coupling does not vanish if one works with spacetimes ... |
2401.11379 | Lai Zhao | Lai Zhao and Meirong Tang and Zhaoyi Xu | The Weak Cosmic Censorship Conjecture in Hairy Kerr Black Holes | null | Eur. Phys. J. C 84,319(2024) | 10.1140/epjc/s10052-024-12698-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Weak Cosmic Censorship Conjecture, since its proposal, has always been a
controversial hypothesis, but its significance in astrophysics is undeniable.
For a regular black hole, its center does not contain a singularity, and the
destruction of the horizon of such black holes is not protected by the Weak
Cosmic Cen... | [
{
"created": "Sun, 21 Jan 2024 03:01:29 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Mar 2024 08:01:06 GMT",
"version": "v2"
}
] | 2024-04-02 | [
[
"Zhao",
"Lai",
""
],
[
"Tang",
"Meirong",
""
],
[
"Xu",
"Zhaoyi",
""
]
] | The Weak Cosmic Censorship Conjecture, since its proposal, has always been a controversial hypothesis, but its significance in astrophysics is undeniable. For a regular black hole, its center does not contain a singularity, and the destruction of the horizon of such black holes is not protected by the Weak Cosmic Censo... |
1907.05239 | Zhoujian Cao Dr | Yi Gong and Zhoujian Cao and He Gao and Bing Zhang | On neutralization of charged black holes | 10 pages. Accepted for publication by MNRAS | null | 10.1093/mnras/stz1904 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For non-spinning, charged (Reissner-Nordstr\"om) black holes, the particles
with an opposite sign of charge with respect to that of the black hole will be
pulled into the black hole by the extra electromagnetic force. Such a hole will
be quickly neutralized so that there should not exist significantly charged,
non-sp... | [
{
"created": "Thu, 11 Jul 2019 14:38:40 GMT",
"version": "v1"
}
] | 2019-07-24 | [
[
"Gong",
"Yi",
""
],
[
"Cao",
"Zhoujian",
""
],
[
"Gao",
"He",
""
],
[
"Zhang",
"Bing",
""
]
] | For non-spinning, charged (Reissner-Nordstr\"om) black holes, the particles with an opposite sign of charge with respect to that of the black hole will be pulled into the black hole by the extra electromagnetic force. Such a hole will be quickly neutralized so that there should not exist significantly charged, non-spin... |
2406.13758 | Aram Saharian | R. M. Avagyan, T. A. Petrosyan, A. A. Saharian, G. H. Harutyunyan | Plane symmetric gravitational fields in (D+1)-dimensional General
Relativity | 12 pages | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider plane symmetric gravitational fields within the framework of
General Relativity in (D+1)-dimensional spacetime. Two classes of vacuum
solutions correspond to higher-dimensional generalizations of the Rindler and
Taub spacetimes. The general solutions are presented for a positive and
negative cosmological ... | [
{
"created": "Wed, 19 Jun 2024 18:13:18 GMT",
"version": "v1"
}
] | 2024-06-21 | [
[
"Avagyan",
"R. M.",
""
],
[
"Petrosyan",
"T. A.",
""
],
[
"Saharian",
"A. A.",
""
],
[
"Harutyunyan",
"G. H.",
""
]
] | We consider plane symmetric gravitational fields within the framework of General Relativity in (D+1)-dimensional spacetime. Two classes of vacuum solutions correspond to higher-dimensional generalizations of the Rindler and Taub spacetimes. The general solutions are presented for a positive and negative cosmological co... |
2103.16354 | Yuri Gusev | Yuri Vladimirovich Gusev | The method of the kernel of the evolution equation in the theory of
gravity | 10 pages, author's translation | Phys. Part. Nucl. Lett. 18 (1), 1-4 (2021) | 10.1134/S1547477121010076 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The method of covariant perturbation theory allowed for the computation of
the kernel of the evolution equation on a spin Riemannian manifold. The
proposed axiomatic definition of the covariant effective action introduces the
universal scale parameter, with the length square dimensionality, into a
dimensionless mathe... | [
{
"created": "Sat, 27 Mar 2021 16:52:18 GMT",
"version": "v1"
}
] | 2021-03-31 | [
[
"Gusev",
"Yuri Vladimirovich",
""
]
] | The method of covariant perturbation theory allowed for the computation of the kernel of the evolution equation on a spin Riemannian manifold. The proposed axiomatic definition of the covariant effective action introduces the universal scale parameter, with the length square dimensionality, into a dimensionless mathema... |
1005.5527 | Ivan Silva | I.P. Costa e Silva | On the Gannon-Lee Singularity Theorem in Higher Dimensions | 13 pages, no figures, to appear in Class. Quantum Grav | Class.Quant.Grav.27:155016,2010 | 10.1088/0264-9381/27/15/155016 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Gannon-Lee singularity theorems give well-known restrictions on the
spatial topology of singularity-free (i.e., nonspacelike geodesically
complete), globally hyperbolic spacetimes. In this paper, we revisit these
classic results in the light of recent developments, especially the failure in
higher dimensions of a... | [
{
"created": "Sun, 30 May 2010 13:14:47 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Silva",
"I. P. Costa e",
""
]
] | The Gannon-Lee singularity theorems give well-known restrictions on the spatial topology of singularity-free (i.e., nonspacelike geodesically complete), globally hyperbolic spacetimes. In this paper, we revisit these classic results in the light of recent developments, especially the failure in higher dimensions of a c... |
1205.0827 | Jaziel Goulart Coelho | F. G. de Oliveira, R. M. Marinho Jr, J. G. Coelho and N. Magalhaes | Data Analysis of Gravitational Waves Signals from Millisecond Pulsars | 4 pages, 3 figures. Accepted for publication in the International
Journal of Modern Physics: Conference Series(IJMPCS) | null | null | null | gr-qc astro-ph.HE astro-ph.SR | http://creativecommons.org/licenses/publicdomain/ | The present work is devoted to the detection of monochromatic gravitational
wave signals emitted by pulsars using ALLEGRO's data detector. We will present
the region (in frequency) of millisecond pulsars of the globular cluster 47
Tucanae (NGC 104) in the band of detector. With this result it was possible to
analyse ... | [
{
"created": "Thu, 3 May 2012 22:14:17 GMT",
"version": "v1"
},
{
"created": "Mon, 14 May 2012 19:36:44 GMT",
"version": "v2"
}
] | 2012-05-15 | [
[
"de Oliveira",
"F. G.",
""
],
[
"Marinho",
"R. M.",
"Jr"
],
[
"Coelho",
"J. G.",
""
],
[
"Magalhaes",
"N.",
""
]
] | The present work is devoted to the detection of monochromatic gravitational wave signals emitted by pulsars using ALLEGRO's data detector. We will present the region (in frequency) of millisecond pulsars of the globular cluster 47 Tucanae (NGC 104) in the band of detector. With this result it was possible to analyse th... |
gr-qc/0607022 | Matt Visser | Damien Martin | Much ado about nothing: a treatise on empty and not-so-empty spacetimes | 206 pages, Masters thesis submitted at Victoria University of
Wellington | null | null | null | gr-qc | null | In this thesis three separate problems relevant to general relativity are
considered. Methods for algorithmically producing all the solutions of
isotropic fluid spheres have been developed over the last five years. A
different and somewhat simpler algorithm is discussed here, as well as
algorithms for anisotropic flu... | [
{
"created": "Thu, 6 Jul 2006 03:54:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Martin",
"Damien",
""
]
] | In this thesis three separate problems relevant to general relativity are considered. Methods for algorithmically producing all the solutions of isotropic fluid spheres have been developed over the last five years. A different and somewhat simpler algorithm is discussed here, as well as algorithms for anisotropic fluid... |
gr-qc/9903010 | Shahar Hod | Shahar Hod | Universal Upper Bound to the Entropy of a Charged System | 9 pages. Submitted to PRD in 10Feb99 | null | null | null | gr-qc | null | We derive a universal upper bound to the entropy of a charged system. The
entropy bound follows from application of the generalized second law of
thermodynamics to a gedanken experiment in which an entropy-bearing charged
system falls into a charged black hole. This bound is stronger than the
Bekenstein entropy bound... | [
{
"created": "Tue, 2 Mar 1999 14:20:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hod",
"Shahar",
""
]
] | We derive a universal upper bound to the entropy of a charged system. The entropy bound follows from application of the generalized second law of thermodynamics to a gedanken experiment in which an entropy-bearing charged system falls into a charged black hole. This bound is stronger than the Bekenstein entropy bound f... |
2312.17291 | Saibal Ray | Saibal Ray, R. Bhattacharya, Sanjay K. Sahay, Abdul Aziz and Amit Das | Gravitational wave: generation and detection techniques | 23 pages, 9 figures, Accepted in International Journal of Modern
Physics D (Special Issue) | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we review the theoretical basis for generation of
gravitational waves and the detection techniques used to detect a gravitational
wave. To materialize this goal in a thorough way we first start with a
mathematical background for general relativity from which a clue for
gravitational wave was conceived ... | [
{
"created": "Thu, 28 Dec 2023 10:43:05 GMT",
"version": "v1"
}
] | 2024-01-01 | [
[
"Ray",
"Saibal",
""
],
[
"Bhattacharya",
"R.",
""
],
[
"Sahay",
"Sanjay K.",
""
],
[
"Aziz",
"Abdul",
""
],
[
"Das",
"Amit",
""
]
] | In this paper, we review the theoretical basis for generation of gravitational waves and the detection techniques used to detect a gravitational wave. To materialize this goal in a thorough way we first start with a mathematical background for general relativity from which a clue for gravitational wave was conceived by... |
2012.03963 | Wei Wei | Wei Wei, E. A. Huerta, Mengshen Yun, Nicholas Loutrel, Md Arif Shaikh,
Prayush Kumar, Roland Haas, Volodymyr Kindratenko | Deep Learning with Quantized Neural Networks for Gravitational Wave
Forecasting of Eccentric Compact Binary Coalescence | 14 pages, 7 figures | null | 10.3847/1538-4357/ac1121 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first application of deep learning forecasting for binary
neutron stars, neutron star - black hole systems, and binary black hole mergers
that span an eccentricity range e <= 0.9. We train neural networks that
describe these astrophysical populations, and then test their performance by
injecting simula... | [
{
"created": "Mon, 7 Dec 2020 19:00:02 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Oct 2021 19:01:28 GMT",
"version": "v2"
}
] | 2021-10-19 | [
[
"Wei",
"Wei",
""
],
[
"Huerta",
"E. A.",
""
],
[
"Yun",
"Mengshen",
""
],
[
"Loutrel",
"Nicholas",
""
],
[
"Shaikh",
"Md Arif",
""
],
[
"Kumar",
"Prayush",
""
],
[
"Haas",
"Roland",
""
],
[
"Kindrat... | We present the first application of deep learning forecasting for binary neutron stars, neutron star - black hole systems, and binary black hole mergers that span an eccentricity range e <= 0.9. We train neural networks that describe these astrophysical populations, and then test their performance by injecting simulate... |
2302.12875 | Ali \"Ovg\"un Dr. | Riasat Ali, Rimsha Babar, Zunaira Akhtar and Ali \"Ovg\"un | Thermodynamics and logarithmic corrections of symmergent black holes | 13 pages. Accepted for publication in Results in Physics
(https://www.sciencedirect.com/science/article/pii/S2211379723000931) | Results in Physics 46, 106300 (2023) | 10.1016/j.rinp.2023.106300 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we study quantum gravity effect on the symmergent black hole
which is derived from quadratic-curvature gravity. To do so, we use the
Klein-Gordon equation which is modified by generalized uncertainty principle
(GUP). After solving the field equations, we examine the symmergent black
hole's tunneling an... | [
{
"created": "Fri, 24 Feb 2023 20:19:11 GMT",
"version": "v1"
}
] | 2023-02-28 | [
[
"Ali",
"Riasat",
""
],
[
"Babar",
"Rimsha",
""
],
[
"Akhtar",
"Zunaira",
""
],
[
"Övgün",
"Ali",
""
]
] | In this paper, we study quantum gravity effect on the symmergent black hole which is derived from quadratic-curvature gravity. To do so, we use the Klein-Gordon equation which is modified by generalized uncertainty principle (GUP). After solving the field equations, we examine the symmergent black hole's tunneling and ... |
gr-qc/0212104 | Natalia Yu. Savchenko | N. Yu. Savchenko and A. V. Toporensky | Scaling solutions on a brane | 11 pages with 2 eps figures, typos corrected | Class.Quant.Grav. 20 (2003) 2553-2562 | 10.1088/0264-9381/20/13/307 | null | gr-qc | null | We investigate the dynamics of a flat isotropic brane Universe with
two-component matter source: perfect fluid with the equation of state
$p=(\gamma-1) \rho$ and a scalar field with a power-law potential $V \sim
\phi^{\alpha}$. The index $\alpha$ can be either positive or negative. We
describe solutions for which the... | [
{
"created": "Wed, 25 Dec 2002 18:19:41 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Mar 2003 15:04:22 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Savchenko",
"N. Yu.",
""
],
[
"Toporensky",
"A. V.",
""
]
] | We investigate the dynamics of a flat isotropic brane Universe with two-component matter source: perfect fluid with the equation of state $p=(\gamma-1) \rho$ and a scalar field with a power-law potential $V \sim \phi^{\alpha}$. The index $\alpha$ can be either positive or negative. We describe solutions for which the s... |
2108.03264 | Kristian Mackewicz | Kris Mackewicz and Craig Hogan | Gravity of Two Photon Decay and its Quantum Coherence | 24 pages, 4 figures. Some revisions made in v2 to better explain
importance of coherence in casual diamond. v2 matches version to be published
in Classical and Quantum Gravity | null | 10.1088/1361-6382/ac5377 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A linear analytical solution is derived for the gravitational shock wave
produced by a particle of mass $M$ that decays into a pair of null particles.
The resulting space-time is shown to be unperturbed and isotropic, except for a
discontinuous perturbation on a spherical null shell. Formulae are derived for
the pert... | [
{
"created": "Fri, 6 Aug 2021 18:26:37 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Sep 2021 15:11:05 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Jan 2022 20:59:36 GMT",
"version": "v3"
}
] | 2022-04-13 | [
[
"Mackewicz",
"Kris",
""
],
[
"Hogan",
"Craig",
""
]
] | A linear analytical solution is derived for the gravitational shock wave produced by a particle of mass $M$ that decays into a pair of null particles. The resulting space-time is shown to be unperturbed and isotropic, except for a discontinuous perturbation on a spherical null shell. Formulae are derived for the pertur... |
gr-qc/0008002 | Victor P. Ruban | Victor P. Ruban (L.D.Landau Institute for Theoretical Physics, Russia) | Slow flows of an relativistic perfect fluid in a static gravitational
field | 4 pages, revtex, no figure | Phys.Rev. D62 (2000) 127504 | 10.1103/PhysRevD.62.127504 | null | gr-qc | null | Relativistic hydrodynamics of an isentropic fluid in a gravitational field is
considered as the particular example from the family of Lagrangian
hydrodynamic-type systems which possess an infinite set of integrals of motion
due to the symmetry of Lagrangian with respect to relabeling of fluid particle
labels. Flows w... | [
{
"created": "Tue, 1 Aug 2000 12:38:58 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ruban",
"Victor P.",
"",
"L.D.Landau Institute for Theoretical Physics, Russia"
]
] | Relativistic hydrodynamics of an isentropic fluid in a gravitational field is considered as the particular example from the family of Lagrangian hydrodynamic-type systems which possess an infinite set of integrals of motion due to the symmetry of Lagrangian with respect to relabeling of fluid particle labels. Flows wit... |
0911.3089 | Ruth Lazkoz | Christian G. Boehmer, Gabriela Caldera-Cabral, Nyein Chan, Ruth
Lazkoz, Roy Maartens | Quintessence with quadratic coupling to dark matter | 11 pages, 8 figures, revtex | Phys.Rev.D81:083003,2010 | 10.1103/PhysRevD.81.083003 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a new form of coupling between dark energy and dark matter that
is quadratic in their energy densities. Then we investigate the background
dynamics when dark energy is in the form of exponential quintessence. The three
types of quadratic coupling all admit late-time accelerating critical points,
but thes... | [
{
"created": "Mon, 16 Nov 2009 17:29:28 GMT",
"version": "v1"
}
] | 2010-04-14 | [
[
"Boehmer",
"Christian G.",
""
],
[
"Caldera-Cabral",
"Gabriela",
""
],
[
"Chan",
"Nyein",
""
],
[
"Lazkoz",
"Ruth",
""
],
[
"Maartens",
"Roy",
""
]
] | We introduce a new form of coupling between dark energy and dark matter that is quadratic in their energy densities. Then we investigate the background dynamics when dark energy is in the form of exponential quintessence. The three types of quadratic coupling all admit late-time accelerating critical points, but these ... |
2405.17592 | Christos Tsagas | Amalia Tzartinoglou, Christos G. Tsagas | The deceleration parameter in perturbed Bianchi universes with a "tilt" | 16 pages, 2 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relative motion effects have long been known to ``contaminate'' the
observations. In fact, when looking back to the history of astronomy, one finds
a number of examples where relative motions have led to a gross
misinterpretation of reality. Using relativistic cosmological perturbation
theory it was shown that observ... | [
{
"created": "Mon, 27 May 2024 18:48:47 GMT",
"version": "v1"
}
] | 2024-05-29 | [
[
"Tzartinoglou",
"Amalia",
""
],
[
"Tsagas",
"Christos G.",
""
]
] | Relative motion effects have long been known to ``contaminate'' the observations. In fact, when looking back to the history of astronomy, one finds a number of examples where relative motions have led to a gross misinterpretation of reality. Using relativistic cosmological perturbation theory it was shown that observer... |
1201.6504 | Ibrahim g\"ull\"u | Ibrahim Gullu | Massive Higher Derivative Gravity Theories | 80 pages, 1 figure, PhD thesis submitted to METU Physics Dept | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis massive higher derivative gravity theories are analyzed in
some detail. One-particle scattering amplitude between two covariantly
conserved sources mediated by a graviton exchange is found at tree-level in $D$
dimensional (Anti)-de Sitter and flat spacetimes for the most general quadratic
curvature the... | [
{
"created": "Tue, 31 Jan 2012 11:03:20 GMT",
"version": "v1"
}
] | 2012-02-01 | [
[
"Gullu",
"Ibrahim",
""
]
] | In this thesis massive higher derivative gravity theories are analyzed in some detail. One-particle scattering amplitude between two covariantly conserved sources mediated by a graviton exchange is found at tree-level in $D$ dimensional (Anti)-de Sitter and flat spacetimes for the most general quadratic curvature theor... |
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