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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/9410020 | null | A. H. Bilge, M. Hortacsu, N. Ozdemir | Particle Creation If a Cosmic String Snaps | 10 pages, MRC.PH.17/94 | Gen.Rel.Grav. 28 (1996) 511-525 | 10.1007/BF02105062 | null | gr-qc | null | We calculate the Bogolubov coefficients for a metric which describes the
snapping of a cosmic string. If we insist on a matching condition for all times
{\it and} a particle interpretation, we find no particle creation.
| [
{
"created": "Mon, 17 Oct 1994 15:21:53 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Bilge",
"A. H.",
""
],
[
"Hortacsu",
"M.",
""
],
[
"Ozdemir",
"N.",
""
]
] | We calculate the Bogolubov coefficients for a metric which describes the snapping of a cosmic string. If we insist on a matching condition for all times {\it and} a particle interpretation, we find no particle creation. |
0705.1369 | R. R. Cuzinatto | R. Aldrovandi, R. R. Cuzinatto, L. G. Medeiros | Interacting Constituents in Cosmology | 24 pages, 6 figures. It includes results presented in "Cosmic
Acceleration from Elementary Interactions" [arXiv:gr-qc/0512135]. Citations
added in v.2 | Int.J.Mod.Phys.D17:857-879,2008 | 10.1142/S0218271808012541 | null | gr-qc | null | Universe evolution, as described by Friedmann's equations, is determined by
source terms fixed by the choice of pressure $\times$ energy-density equations
of state $p(\rho)$. The usual approach in Cosmology considers equations of
state accounting only for kinematic terms, ignoring the contribution from the
interactio... | [
{
"created": "Wed, 9 May 2007 22:21:46 GMT",
"version": "v1"
},
{
"created": "Tue, 22 May 2007 19:52:49 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Aldrovandi",
"R.",
""
],
[
"Cuzinatto",
"R. R.",
""
],
[
"Medeiros",
"L. G.",
""
]
] | Universe evolution, as described by Friedmann's equations, is determined by source terms fixed by the choice of pressure $\times$ energy-density equations of state $p(\rho)$. The usual approach in Cosmology considers equations of state accounting only for kinematic terms, ignoring the contribution from the interactions... |
0705.1514 | Duncan Brown | Duncan A. Brown | Searching for Gravitational Radiation from Binary Black Hole MACHOs in
the Galactic Halo | 206 pages, 64 figures. Typos corrected in Eqs. (2.104), (2.108),
(2.124) and (4.3) | PhD Thesis, University of Wisconsin-Milwaukee, 2004 | null | LIGO-P050015-00-R | gr-qc | null | The Laser Interferometer Gravitational Wave Observatory (LIGO) is one of a
new generation of detectors of gravitational radiation. The existence of
gravitational radiation was first predicted by Einstein in 1916, however
gravitational waves have not yet been directly observed. One source of
gravitation radiation is b... | [
{
"created": "Thu, 10 May 2007 16:48:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brown",
"Duncan A.",
""
]
] | The Laser Interferometer Gravitational Wave Observatory (LIGO) is one of a new generation of detectors of gravitational radiation. The existence of gravitational radiation was first predicted by Einstein in 1916, however gravitational waves have not yet been directly observed. One source of gravitation radiation is bin... |
1901.11262 | Sebastian V\"olkel | Sebastian H. V\"olkel and Kostas D. Kokkotas | On the Inverse Spectrum Problem of Neutron Stars | null | null | 10.1088/1361-6382/ab186e | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we revisit axial perturbations of spherically symmetric and
non-rotating neutron stars. Although it has been object of many studies, it
still offers new insights that are of potential interest for more realistic
scenarios or in the study exotic compact objects, which have drawn much
attention recently. B... | [
{
"created": "Thu, 31 Jan 2019 08:32:10 GMT",
"version": "v1"
}
] | 2019-05-22 | [
[
"Völkel",
"Sebastian H.",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | In this work we revisit axial perturbations of spherically symmetric and non-rotating neutron stars. Although it has been object of many studies, it still offers new insights that are of potential interest for more realistic scenarios or in the study exotic compact objects, which have drawn much attention recently. By ... |
gr-qc/9908040 | David Langlois | G. L. Comer, David Langlois, Lap Ming Lin | Quasi-Normal Modes of General Relativistic Superfluid Neutron Stars | 31 pages, RevTex, 17 figures | Phys.Rev. D60 (1999) 104025 | 10.1103/PhysRevD.60.104025 | null | gr-qc astro-ph | null | We develop a general formalism to treat, in general relativity, the linear
oscillations of a two-fluid star about static (non-rotating) configurations.
Such a formalism is intended for neutron stars, whose matter content can be
described, as a first approximation, by a two-fluid model: one fluid is the
neutron superf... | [
{
"created": "Thu, 12 Aug 1999 15:19:55 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Comer",
"G. L.",
""
],
[
"Langlois",
"David",
""
],
[
"Lin",
"Lap Ming",
""
]
] | We develop a general formalism to treat, in general relativity, the linear oscillations of a two-fluid star about static (non-rotating) configurations. Such a formalism is intended for neutron stars, whose matter content can be described, as a first approximation, by a two-fluid model: one fluid is the neutron superflu... |
gr-qc/0603015 | Thomas Marlow | Thomas Marlow | Relationalism vs. Bayesianism | 13 pages | null | null | null | gr-qc | null | We compare and contrast the basic principles of two philosophies: Bayesianism
and relationalism. These two philosophies are both based upon criteria of
rationality. The analogy invoked in such a comparison seems rather apt when
discussing tentative proofs of quantum nonlocality. We argue that Bayesianism
is almost to... | [
{
"created": "Tue, 7 Mar 2006 14:47:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Marlow",
"Thomas",
""
]
] | We compare and contrast the basic principles of two philosophies: Bayesianism and relationalism. These two philosophies are both based upon criteria of rationality. The analogy invoked in such a comparison seems rather apt when discussing tentative proofs of quantum nonlocality. We argue that Bayesianism is almost to q... |
1906.09346 | Francesco Muia | Francesco Muia, Michele Cicoli, Katy Clough, Francisco Pedro, Fernando
Quevedo, Gian Paolo Vacca | The Fate of Dense Scalar Stars | null | null | 10.1088/1475-7516/2019/07/044 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Long-lived pseudo-solitonic objects, known as oscillons/oscillatons, which we
collectively call real scalar stars, are ubiquitous in early Universe cosmology
of scalar field theories. Typical examples are axions stars and moduli stars.
Using numerical simulations in full general relativity to include the effects
of g... | [
{
"created": "Fri, 21 Jun 2019 22:16:28 GMT",
"version": "v1"
}
] | 2019-08-07 | [
[
"Muia",
"Francesco",
""
],
[
"Cicoli",
"Michele",
""
],
[
"Clough",
"Katy",
""
],
[
"Pedro",
"Francisco",
""
],
[
"Quevedo",
"Fernando",
""
],
[
"Vacca",
"Gian Paolo",
""
]
] | Long-lived pseudo-solitonic objects, known as oscillons/oscillatons, which we collectively call real scalar stars, are ubiquitous in early Universe cosmology of scalar field theories. Typical examples are axions stars and moduli stars. Using numerical simulations in full general relativity to include the effects of gra... |
2105.12313 | Shuo Xin | Shuo Xin, Baoyi Chen, Rico K. L. Lo, Ling Sun, Wen-Biao Han, Xingyu
Zhong, Manu Srivastava, Sizheng Ma, Qingwen Wang, and Yanbei Chen | Gravitational-wave echoes from spinning exotic compact objects:
numerical waveforms from the Teukolsky equation | null | null | 10.1103/PhysRevD.104.104005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present numerical waveforms of gravitational-wave echoes from spinning
exotic compact objects (ECOs) that result from binary black hole coalescence.
We obtain these echoes by solving the Teukolsky equation for the $\psi_4$
associated with gravitational waves that propagate toward the horizon of a Kerr
spacetime, a... | [
{
"created": "Wed, 26 May 2021 03:25:50 GMT",
"version": "v1"
}
] | 2021-11-10 | [
[
"Xin",
"Shuo",
""
],
[
"Chen",
"Baoyi",
""
],
[
"Lo",
"Rico K. L.",
""
],
[
"Sun",
"Ling",
""
],
[
"Han",
"Wen-Biao",
""
],
[
"Zhong",
"Xingyu",
""
],
[
"Srivastava",
"Manu",
""
],
[
"Ma",
"Sizh... | We present numerical waveforms of gravitational-wave echoes from spinning exotic compact objects (ECOs) that result from binary black hole coalescence. We obtain these echoes by solving the Teukolsky equation for the $\psi_4$ associated with gravitational waves that propagate toward the horizon of a Kerr spacetime, and... |
1502.00149 | Klaus Kassner | Klaus Kassner | Classroom reconstruction of the Schwarzschild metric | 14 pages, 2 figures; a shortened version (omitting the Rindler metric
part) has been submitted to and published in, the European Journal of Physics | K. Kassner, Eur. J. Phys. 36 (2015) 065031 | 10.1088/0143-0807/36/6/065031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A promising way to introduce general relativity in the classroom is to study
the physical implications of certain given metrics, such as the Schwarzschild
one. This involves lower mathematical expenditure than an approach focusing on
differential geometry in its full glory and permits to emphasize physical
aspects be... | [
{
"created": "Sat, 31 Jan 2015 18:59:23 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Sep 2015 16:12:55 GMT",
"version": "v2"
}
] | 2015-09-14 | [
[
"Kassner",
"Klaus",
""
]
] | A promising way to introduce general relativity in the classroom is to study the physical implications of certain given metrics, such as the Schwarzschild one. This involves lower mathematical expenditure than an approach focusing on differential geometry in its full glory and permits to emphasize physical aspects befo... |
1709.04055 | Amin Salehi | Amin.Salehi and Mojtaba.Mahmoudi fard | Bouncing universe of entropy-corrected Friedmann equations | 16 pages, 20 figures | Eur. Phys. J. C (2018) 78:232 | 10.1140/epjc/s10052-018-5727-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The investigation of quantum gravity effects in order to avoid the big bang
singularity is a requisite, so that the idea of oscillating universes is
introduced as an alternative for standard cosmological model. Therefore, the
Friedmann equations arising from the quantum corrections of entropy-area
relation provide th... | [
{
"created": "Tue, 12 Sep 2017 20:47:11 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Sep 2017 10:12:36 GMT",
"version": "v2"
}
] | 2018-04-18 | [
[
"Salehi",
"Amin.",
""
],
[
"fard",
"Mojtaba. Mahmoudi",
""
]
] | The investigation of quantum gravity effects in order to avoid the big bang singularity is a requisite, so that the idea of oscillating universes is introduced as an alternative for standard cosmological model. Therefore, the Friedmann equations arising from the quantum corrections of entropy-area relation provide the ... |
2210.06195 | David Brizuela | David Brizuela, Albert Duran-Cabac\'es | Relativistic effects on the Schr\"odinger-Newton equation | Version accepted for publication. We have added Refs. [20], [22],
[23], and [24], and corrected several typos in the bibliography. The new
Appendix B analyzes the effects produced by relativistic corrections in the
Poisson equation. We have also included several clarifications, in particular
in Sec. 2.2., to ex... | Phys. Rev. D 106 (2022) 124038 | 10.1103/PhysRevD.106.124038 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Schr\"odinger-Newton model describes self-gravitating quantum particles,
and it is often cited to explain the gravitational collapse of the wave
function and the localization of macroscopic objects. However, this model is
completely nonrelativistic. Thus, in order to study whether the relativistic
effects may spo... | [
{
"created": "Wed, 12 Oct 2022 13:27:46 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jan 2023 13:22:52 GMT",
"version": "v2"
}
] | 2023-01-04 | [
[
"Brizuela",
"David",
""
],
[
"Duran-Cabacés",
"Albert",
""
]
] | The Schr\"odinger-Newton model describes self-gravitating quantum particles, and it is often cited to explain the gravitational collapse of the wave function and the localization of macroscopic objects. However, this model is completely nonrelativistic. Thus, in order to study whether the relativistic effects may spoil... |
2303.11928 | Massimo Giovannini | Massimo Giovannini | Relic gravitons and high-frequency detectors | 43 pages, 13 figures; two corrections in two plots; comments added | null | 10.1088/1475-7516/2023/05/056 | null | gr-qc astro-ph.CO hep-ex hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Cosmic gravitons are expected in the MHz-GHz regions that are currently
unreachable by the operating wide-band interferometers and where various
classes of electromechanical detectors have been proposed through the years.
The minimal chirp amplitude detectable by these instruments is often set on the
basis of the sen... | [
{
"created": "Tue, 21 Mar 2023 15:29:10 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jun 2023 20:50:47 GMT",
"version": "v2"
}
] | 2023-06-12 | [
[
"Giovannini",
"Massimo",
""
]
] | Cosmic gravitons are expected in the MHz-GHz regions that are currently unreachable by the operating wide-band interferometers and where various classes of electromechanical detectors have been proposed through the years. The minimal chirp amplitude detectable by these instruments is often set on the basis of the sensi... |
gr-qc/0211089 | Allan Joseph Medved | Gilad Gour and A.J.M. Medved | Kerr Black Hole as a Quantum Rotator | 15 pages, Revtex | Class.Quant.Grav.20:2261-2274,2003 | 10.1088/0264-9381/20/11/321 | null | gr-qc hep-th quant-ph | null | It has been proposed by Bekenstein and others that the horizon area of a
black hole conforms, upon quantization, to a discrete and uniformly spaced
spectrum. In this paper, we consider the area spectrum for the highly
non-trivial case of a rotating (Kerr) black hole solution. Following a prior
work by Barvinsky, Das ... | [
{
"created": "Tue, 26 Nov 2002 20:18:21 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Gour",
"Gilad",
""
],
[
"Medved",
"A. J. M.",
""
]
] | It has been proposed by Bekenstein and others that the horizon area of a black hole conforms, upon quantization, to a discrete and uniformly spaced spectrum. In this paper, we consider the area spectrum for the highly non-trivial case of a rotating (Kerr) black hole solution. Following a prior work by Barvinsky, Das an... |
1506.00101 | Romain Gicquaud | Piotr Chru\'sciel and Romain Gicquaud | Bifurcating solutions of the Lichnerowicz equation | 33 pages, 25 figures | null | null | null | gr-qc math.AP math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give an exhaustive description of bifurcations and of the number of
solutions of the vacuum Lichnerowicz equation with positive cosmological
constant on $S^1\times S^2$ with $U(1)\times SO(3)$-invariant seed data. The
resulting CMC slicings of Schwarzschild-de Sitter and Nariai are described.
| [
{
"created": "Sat, 30 May 2015 10:29:41 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Nov 2015 10:07:03 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Apr 2016 15:07:44 GMT",
"version": "v3"
}
] | 2016-04-12 | [
[
"Chruściel",
"Piotr",
""
],
[
"Gicquaud",
"Romain",
""
]
] | We give an exhaustive description of bifurcations and of the number of solutions of the vacuum Lichnerowicz equation with positive cosmological constant on $S^1\times S^2$ with $U(1)\times SO(3)$-invariant seed data. The resulting CMC slicings of Schwarzschild-de Sitter and Nariai are described. |
gr-qc/0608045 | Guihua Tian | Tian Gui-hua, Shi-kun Wang, Shuquan Zhong | The stable problem in the Rindler space-time | null | null | null | null | gr-qc | null | We carefully study the stable problem of the Rindler space time by the scalar
wave perturbation. Using the two different coordinate systems, the scalar wave
equation is investigated. The results are different in these two cases. They
are analyzed and compared in detail. The conclusions are: (a) the Rindler space
time... | [
{
"created": "Wed, 9 Aug 2006 09:29:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gui-hua",
"Tian",
""
],
[
"Wang",
"Shi-kun",
""
],
[
"Zhong",
"Shuquan",
""
]
] | We carefully study the stable problem of the Rindler space time by the scalar wave perturbation. Using the two different coordinate systems, the scalar wave equation is investigated. The results are different in these two cases. They are analyzed and compared in detail. The conclusions are: (a) the Rindler space time a... |
1803.02344 | Milko Estrada | Milko Estrada, Francisco Tello-Ortiz | A new family of analytical anisotropic solutions by gravitational
decoupling | null | Eur.Phys.J.Plus 133 (2018) no.11, 453 | 10.1140/epjp/i2018-12249-9 | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | This work is focused in the study of analytic anisotropic solutions to
Einstein's field equations, describing spherically symmetric and static
configurations by way of the gravitational decoupling through the method of
Minimal Geometric Deformation (MGD). For this we apply MGD to Heintzmann's
solution obtaining two n... | [
{
"created": "Tue, 6 Mar 2018 18:57:11 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Apr 2018 22:50:39 GMT",
"version": "v2"
},
{
"created": "Sat, 12 May 2018 23:49:42 GMT",
"version": "v3"
},
{
"created": "Mon, 27 Aug 2018 15:42:33 GMT",
"version": "v4"
}
] | 2019-03-27 | [
[
"Estrada",
"Milko",
""
],
[
"Tello-Ortiz",
"Francisco",
""
]
] | This work is focused in the study of analytic anisotropic solutions to Einstein's field equations, describing spherically symmetric and static configurations by way of the gravitational decoupling through the method of Minimal Geometric Deformation (MGD). For this we apply MGD to Heintzmann's solution obtaining two new... |
gr-qc/9302012 | Gisele Murphy | Maximo Banados, Marc Henneaux, Claudio Teitelboim, Jorge Zanelli | Geometry of the 2+1 Black Hole | 51 pages, (LaTex file, figures not included, for hard copy figures,
contact: murphy@iassns.bitnet), Institute for Advanced Study #HEP.92/81 | Phys.Rev.D48:1506-1525,1993 | 10.1103/PhysRevD.48.1506 | null | gr-qc | null | The geometry of the spinning black holes of standard Einstein theory in 2+1
dimensions, with a negative cosmological constant and without couplings to
matter, is analyzed in detail. It is shown that the black hole arises from
identifications of points of anti-de Sitter space by a discrete subgroup of
$SO(2,2)$. The g... | [
{
"created": "Wed, 10 Feb 1993 15:26:26 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Banados",
"Maximo",
""
],
[
"Henneaux",
"Marc",
""
],
[
"Teitelboim",
"Claudio",
""
],
[
"Zanelli",
"Jorge",
""
]
] | The geometry of the spinning black holes of standard Einstein theory in 2+1 dimensions, with a negative cosmological constant and without couplings to matter, is analyzed in detail. It is shown that the black hole arises from identifications of points of anti-de Sitter space by a discrete subgroup of $SO(2,2)$. The gen... |
2312.04723 | Gil de Oliveira-Neto | Vinicius G. Oliveira, Gil de Oliveira-Neto and Ilya L. Shapiro | Kantoswki-Sachs model with a running cosmological constant and radiation | The paper has 16 pages and 16 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The simplest anisotropic model of the early Universe is the one with two
conformal factors, which can be identified as Kantowski-Sachs metric, or the
reduced version of the Bianchi-I metric. To fit the existing observational
data, it is important that the anisotropy is washed out in the early stage of
the evolution. ... | [
{
"created": "Thu, 7 Dec 2023 22:06:41 GMT",
"version": "v1"
}
] | 2023-12-11 | [
[
"Oliveira",
"Vinicius G.",
""
],
[
"de Oliveira-Neto",
"Gil",
""
],
[
"Shapiro",
"Ilya L.",
""
]
] | The simplest anisotropic model of the early Universe is the one with two conformal factors, which can be identified as Kantowski-Sachs metric, or the reduced version of the Bianchi-I metric. To fit the existing observational data, it is important that the anisotropy is washed out in the early stage of the evolution. We... |
gr-qc/0702140 | Eitan Bachmat | Eitan Bachmat | Discrete spacetime and its applications | null | null | null | null | gr-qc | null | We survey some results about the asymptotic behavior of discrete spacetime
models, which appeared in diverse settings in the physics and math literature.
We then discuss some recent applications, including scheduling in disk drives
and analysis of airplane boarding strategies.
| [
{
"created": "Tue, 27 Feb 2007 11:54:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bachmat",
"Eitan",
""
]
] | We survey some results about the asymptotic behavior of discrete spacetime models, which appeared in diverse settings in the physics and math literature. We then discuss some recent applications, including scheduling in disk drives and analysis of airplane boarding strategies. |
2209.02252 | Ryo Saito | Atsushi Naruko, Ryo Saito, Norihiro Tanahashi, Daisuke Yamauchi | Ostrogradsky mode in scalar-tensor theories with higher-order derivative
couplings to matter | 14+4 pages, no figures: published version: A typo in eq. (38) of the
first version is corrected. As a result, a broader class of the matter metric
becomes consistent with the degeneracy and invertible conditions | PTEP 2023 (2023) 5, 053E02 | 10.1093/ptep/ptad049 | YITP-22-94 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | A metric transformation is a tool to find a new theory of gravity beyond
general relativity. The gravity action is guaranteed to be free from a
dangerous Ostrogradsky mode as long as the metric transformation is regular and
invertible. Various degenerate higher-order scalar-tensor theories (DHOST)
without extra degre... | [
{
"created": "Tue, 6 Sep 2022 06:58:51 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Aug 2023 09:05:45 GMT",
"version": "v2"
}
] | 2023-08-07 | [
[
"Naruko",
"Atsushi",
""
],
[
"Saito",
"Ryo",
""
],
[
"Tanahashi",
"Norihiro",
""
],
[
"Yamauchi",
"Daisuke",
""
]
] | A metric transformation is a tool to find a new theory of gravity beyond general relativity. The gravity action is guaranteed to be free from a dangerous Ostrogradsky mode as long as the metric transformation is regular and invertible. Various degenerate higher-order scalar-tensor theories (DHOST) without extra degrees... |
gr-qc/0108061 | Jose Natario | Jose Natario | Linking and causality in (2+1)-dimensional static spacetimes | 13 pages, 3 figures; typos corrected, 2 figures added | Class.Quant.Grav. 19 (2002) 3115-3126 | 10.1088/0264-9381/19/12/301 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Given a (d+1)-dimensional spacetime (M,g), one can consider the set N of all
its null geodesics. If (M,g) is globally hyperbolic then this set is naturally
a smooth (2d-1)-manifold. The sky of an event x in M is the set X of all null
geodesics through x, and is an embedded submanifold of N diffeomorphic to
S^{d-1}. L... | [
{
"created": "Fri, 24 Aug 2001 11:11:10 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jul 2002 10:50:37 GMT",
"version": "v2"
},
{
"created": "Fri, 13 Jul 2012 16:20:10 GMT",
"version": "v3"
}
] | 2012-07-16 | [
[
"Natario",
"Jose",
""
]
] | Given a (d+1)-dimensional spacetime (M,g), one can consider the set N of all its null geodesics. If (M,g) is globally hyperbolic then this set is naturally a smooth (2d-1)-manifold. The sky of an event x in M is the set X of all null geodesics through x, and is an embedded submanifold of N diffeomorphic to S^{d-1}. Low... |
gr-qc/9810065 | Thomas Baumgarte | Thomas W. Baumgarte and Stuart L. Shapiro | On the Numerical Integration of Einstein's Field Equations | 7 pages, 3 figures, RevTeX, to appear in Phys. Rev. D | Phys.Rev. D59 (1999) 024007 | 10.1103/PhysRevD.59.024007 | null | gr-qc astro-ph | null | Many numerical codes now under development to solve Einstein's equations of
general relativity in 3+1 dimensional spacetimes employ the standard ADM form
of the field equations. This form involves evolution equations for the raw
spatial metric and extrinsic curvature tensors. Following Shibata and Nakamura,
we modify... | [
{
"created": "Tue, 20 Oct 1998 14:51:23 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Baumgarte",
"Thomas W.",
""
],
[
"Shapiro",
"Stuart L.",
""
]
] | Many numerical codes now under development to solve Einstein's equations of general relativity in 3+1 dimensional spacetimes employ the standard ADM form of the field equations. This form involves evolution equations for the raw spatial metric and extrinsic curvature tensors. Following Shibata and Nakamura, we modify t... |
1906.10544 | Benrong Mu | Benrong Mu, Jun Tao and Peng Wang | Minimal Length Effect on Thermodynamics and Weak Cosmic Censorship
Conjecture in anti-de Sitter Black Holes via Charged Particle Absorption | 21 pages. version accepted for publication in AHEP | Advances in High Energy Physics, vol. 2020, Article ID 2612946, 9
pages, 2020 | 10.1155/2020/2612946 | CTP-SCU/2019008 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate minimal length effects on the thermodynamics
and weak cosmic censorship conjecture in a RN-AdS black bole via charged
particle absorption. We first use the generalized uncertainty principle (GUP)
to investigate the minimal length effect on the Hamilton-Jacobi equation. After
the deformed... | [
{
"created": "Mon, 24 Jun 2019 12:40:11 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jun 2019 07:25:43 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Mar 2021 08:34:50 GMT",
"version": "v3"
}
] | 2021-03-16 | [
[
"Mu",
"Benrong",
""
],
[
"Tao",
"Jun",
""
],
[
"Wang",
"Peng",
""
]
] | In this paper, we investigate minimal length effects on the thermodynamics and weak cosmic censorship conjecture in a RN-AdS black bole via charged particle absorption. We first use the generalized uncertainty principle (GUP) to investigate the minimal length effect on the Hamilton-Jacobi equation. After the deformed H... |
gr-qc/0401045 | Carlos O. Lousto | C. O. Lousto and R. H. Price | Radiation content of Conformally flat initial data | 4 pages, 4 figures | Phys.Rev. D69 (2004) 087503 | 10.1103/PhysRevD.69.087503 | UTBRG-2004-001 | gr-qc | null | We study the radiation of energy and linear momentum emitted to infinity by
the headon collision of binary black holes, starting from rest at a finite
initial separation, in the extreme mass ratio limit. For these configurations
we identify the radiation produced by the initially conformally flat choice of
the three ... | [
{
"created": "Sun, 11 Jan 2004 20:12:48 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Lousto",
"C. O.",
""
],
[
"Price",
"R. H.",
""
]
] | We study the radiation of energy and linear momentum emitted to infinity by the headon collision of binary black holes, starting from rest at a finite initial separation, in the extreme mass ratio limit. For these configurations we identify the radiation produced by the initially conformally flat choice of the three ge... |
2103.11365 | Cosimo Bambi | Cosimo Bambi | Testing General Relativity with black hole X-ray data: recent progress
and future developments | 4 pages, 2 figures; contribution to the 2021 Gravitation session of
the 55th Rencontres de Moriond | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theory of General Relativity has successfully passed a large number of
observational tests. The theory has been extensively tested in the weak-field
regime with experiments in the Solar System and observations of binary pulsars.
The past five years have seen significant advancements in the study of the
strong-fie... | [
{
"created": "Sun, 21 Mar 2021 11:28:01 GMT",
"version": "v1"
}
] | 2021-03-23 | [
[
"Bambi",
"Cosimo",
""
]
] | The theory of General Relativity has successfully passed a large number of observational tests. The theory has been extensively tested in the weak-field regime with experiments in the Solar System and observations of binary pulsars. The past five years have seen significant advancements in the study of the strong-field... |
2301.02813 | Houri Ziaeepour | Houri Ziaeepour | \boldmath $SU(\infty)$ Quantum Gravity: Emergence of Gravity in an
Infinitely Divisible Quantum Universe | v4: more concise; QSL section extended | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $SU(\infty)$-QGR is a foundationally quantum approach to gravity. It assumes
that the Hilbert space of the Universe as a whole represents the symmetry group
$SU(\infty)$, and demonstrates this symmetry for Hilbert spaces of infinite
number of subsystems that randomly emerge and represent arbitrary finite rank
interna... | [
{
"created": "Sat, 7 Jan 2023 09:19:15 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Jan 2023 09:28:16 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Aug 2023 07:17:16 GMT",
"version": "v3"
},
{
"created": "Thu, 4 Jul 2024 18:19:28 GMT",
"version": "v4"
}
] | 2024-07-08 | [
[
"Ziaeepour",
"Houri",
""
]
] | $SU(\infty)$-QGR is a foundationally quantum approach to gravity. It assumes that the Hilbert space of the Universe as a whole represents the symmetry group $SU(\infty)$, and demonstrates this symmetry for Hilbert spaces of infinite number of subsystems that randomly emerge and represent arbitrary finite rank internal ... |
1905.09390 | Alexandre Filippov | Alexandre T.Filippov | Constructing and solving cosmologies of early universes with dark energy
and matter. I | 25 pages, mostly `cosmetic' corrections on pages 1-5, 7, 16-17, 21-22 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main purpose of this paper is to advance a unified theory of dark matter,
dark energy, and inflation first formulated in 2008. Our minimal affine
extension of the GR has geodesics coinciding with the pseudo Riemannian ones,
up to parameterizations. It predicts a `sterile' massive vecton and depends on
two new dim... | [
{
"created": "Mon, 20 May 2019 18:55:31 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Jun 2019 10:20:11 GMT",
"version": "v2"
}
] | 2019-07-02 | [
[
"Filippov",
"Alexandre T.",
""
]
] | The main purpose of this paper is to advance a unified theory of dark matter, dark energy, and inflation first formulated in 2008. Our minimal affine extension of the GR has geodesics coinciding with the pseudo Riemannian ones, up to parameterizations. It predicts a `sterile' massive vecton and depends on two new dimen... |
0906.5530 | Mariafelicia De Laurentis | Salvatore Capozziello, Mariafelicia De Laurentis, Luca Forte, Fabio
Garufi and Leopoldo Milano | Relativistic orbits and Gravitational Waves from gravitomagnetic
corrections | 6 pages, 10 figures; Multifrequency Behaviour of High-Energy Cosmic
Sources, Vulcano Workshop 2009 | J.Phys.Conf.Ser.228:012052,2010 | 10.1088/1742-6596/228/1/012052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Corrections to the relativistic theory of orbits are discussed considering
higher order approximations induced by gravitomagnetic effects. Beside the
standard periastron effect of General Relativity (GR), a new nutation effect
was found due to the ${\displaystyle c^{-3}}$ orbital correction. According to
the presence... | [
{
"created": "Tue, 30 Jun 2009 14:08:18 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Capozziello",
"Salvatore",
""
],
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Forte",
"Luca",
""
],
[
"Garufi",
"Fabio",
""
],
[
"Milano",
"Leopoldo",
""
]
] | Corrections to the relativistic theory of orbits are discussed considering higher order approximations induced by gravitomagnetic effects. Beside the standard periastron effect of General Relativity (GR), a new nutation effect was found due to the ${\displaystyle c^{-3}}$ orbital correction. According to the presence o... |
2201.03584 | M Herrero-Valea | Francesco Del Porro, Mario Herrero-Valea, Stefano Liberati, Marc
Schneider | Time Orientability and Particle Production from Universal Horizons | 6 pages, new title, minor changes. Matches journal version | null | 10.1103/PhysRevD.105.104009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss particle production in spacetimes endowed with a universal horizon
in Einstein--Aether and Horava gravity. We argue that continuity and
differentiability of the lapse function require the orientation of the
foliation in the interior of the horizon to be reversed with respect to the
exterior one. Unless thi... | [
{
"created": "Mon, 10 Jan 2022 19:00:07 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jun 2022 08:03:47 GMT",
"version": "v2"
}
] | 2022-06-28 | [
[
"Del Porro",
"Francesco",
""
],
[
"Herrero-Valea",
"Mario",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Schneider",
"Marc",
""
]
] | We discuss particle production in spacetimes endowed with a universal horizon in Einstein--Aether and Horava gravity. We argue that continuity and differentiability of the lapse function require the orientation of the foliation in the interior of the horizon to be reversed with respect to the exterior one. Unless this ... |
1908.01564 | Purba Mukherjee | Purba Mukherjee, Soumya Chakrabarti | Exact Solutions and Accelerating Universe in Modified Brans-Dicke
Theories | 12 pages, 10 figures, to appear in The European Physical Journal C
(Particles and Fields) | Eur. Phys. J. C (2019) 79:681 | 10.1140/epjc/s10052-019-7201-x | EPJC-19-06-153.R1 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exact solutions are studied in the context of modified Brans-Dicke theory.
The non-linearity of the modified Brans-Dicke field equations is treated with
the Euler-Duarte-Moreira method of integrability of anharmonic oscillator
equation. While some solutions show a forever accelerating nature, in some
cases there is a... | [
{
"created": "Mon, 5 Aug 2019 11:33:42 GMT",
"version": "v1"
}
] | 2019-08-19 | [
[
"Mukherjee",
"Purba",
""
],
[
"Chakrabarti",
"Soumya",
""
]
] | Exact solutions are studied in the context of modified Brans-Dicke theory. The non-linearity of the modified Brans-Dicke field equations is treated with the Euler-Duarte-Moreira method of integrability of anharmonic oscillator equation. While some solutions show a forever accelerating nature, in some cases there is a s... |
2311.05689 | Nikhil Sarin | Nikhil Sarin, Hiranya V. Peiris, Daniel J. Mortlock, Justin Alsing,
Samaya M. Nissanke, Stephen M. Feeney | Measuring the nuclear equation of state with neutron star-black hole
mergers | 10 pages, 4 Figures. Accepted in PRD | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Gravitational-wave (GW) observations of neutron star-black hole (NSBH)
mergers are sensitive to the nuclear equation of state (EOS). We present a new
methodology for EOS inference with non-parametric Gaussian process (GP) priors,
enabling direct constraints on the pressure at specific densities and the
length-scale o... | [
{
"created": "Thu, 9 Nov 2023 19:01:08 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jul 2024 14:37:43 GMT",
"version": "v2"
}
] | 2024-07-10 | [
[
"Sarin",
"Nikhil",
""
],
[
"Peiris",
"Hiranya V.",
""
],
[
"Mortlock",
"Daniel J.",
""
],
[
"Alsing",
"Justin",
""
],
[
"Nissanke",
"Samaya M.",
""
],
[
"Feeney",
"Stephen M.",
""
]
] | Gravitational-wave (GW) observations of neutron star-black hole (NSBH) mergers are sensitive to the nuclear equation of state (EOS). We present a new methodology for EOS inference with non-parametric Gaussian process (GP) priors, enabling direct constraints on the pressure at specific densities and the length-scale of ... |
gr-qc/0202008 | Christodoulakis Theodosios | T. Christodoulakis and G.O. Papadopoulos | Time-Dependent Automorphism Inducing Diffeomorphisms, Open Algebras and
the Generality of the Kantowski-Sachs Vacuum Geometry | 10 pages, no figures, LaTeX2e | Class.Quant.Grav.19:4855-4862,2002 | 10.1088/0264-9381/19/19/305 | null | gr-qc math-ph math.DG math.MP | null | Following the spirit of a previous work of ours, we investigate the group of
those General Coordinate Transformations (GCTs) which preserve manifest spatial
homogeneity. In contrast to the case of Bianchi Type Models we, here, permit an
isometry group of motions $G_{4}=SO(3)\otimes T_{r}$, where $T_{r}$ is the
transl... | [
{
"created": "Mon, 4 Feb 2002 12:15:56 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jun 2002 11:50:27 GMT",
"version": "v2"
}
] | 2009-10-09 | [
[
"Christodoulakis",
"T.",
""
],
[
"Papadopoulos",
"G. O.",
""
]
] | Following the spirit of a previous work of ours, we investigate the group of those General Coordinate Transformations (GCTs) which preserve manifest spatial homogeneity. In contrast to the case of Bianchi Type Models we, here, permit an isometry group of motions $G_{4}=SO(3)\otimes T_{r}$, where $T_{r}$ is the translat... |
1301.3111 | Cecilia Chirenti | Cecilia Chirenti, Jozef Skakala and Shin'ichirou Yoshida | Slowly rotating neutron stars with small differential rotation:
equilibrium models and oscillations in the Cowling approximation | v3: 1 figure added, minor typos corrected, 12 pages, 12 figures,
final version to appear in PRD | Phys. Rev. D 87, 044043 (2013) | 10.1103/PhysRevD.87.044043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Newly born neutron stars can present differential rotation, even if later it
should be suppressed by viscosity or a sufficiently strong magnetic field. And
in this early stage of its life, a neutron star is expected to have a strong
emission of gravitational waves, which could be influenced by the differential
rotati... | [
{
"created": "Mon, 14 Jan 2013 20:20:02 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jan 2013 18:51:50 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Feb 2013 14:49:45 GMT",
"version": "v3"
}
] | 2013-02-22 | [
[
"Chirenti",
"Cecilia",
""
],
[
"Skakala",
"Jozef",
""
],
[
"Yoshida",
"Shin'ichirou",
""
]
] | Newly born neutron stars can present differential rotation, even if later it should be suppressed by viscosity or a sufficiently strong magnetic field. And in this early stage of its life, a neutron star is expected to have a strong emission of gravitational waves, which could be influenced by the differential rotation... |
0905.4097 | Tonatiuh Matos | Tonatiuh Matos, Galaxia Miranda, Ruben Sanchez-Sanchez and Petra
Wiederhold | Class of Einstein-Maxwell-Dilaton-Axion Space-Times | 12 pages, 2 figures 1 appendix | Phys.Rev.D79:124016,2009 | 10.1103/PhysRevD.79.124016 | CIEA/09-gr14 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the harmonic maps ansatz to find exact solutions of the
Einstein-Maxwell-Dilaton-Axion (EMDA) equations. The solutions are harmonic
maps invariant to the symplectic real group in four dimensions
$Sp(4,\Rreal)\sim O(5)$. We find solutions of the EMDA field equations for the
one and two dimensional subspaces of ... | [
{
"created": "Tue, 26 May 2009 00:20:39 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Matos",
"Tonatiuh",
""
],
[
"Miranda",
"Galaxia",
""
],
[
"Sanchez-Sanchez",
"Ruben",
""
],
[
"Wiederhold",
"Petra",
""
]
] | We use the harmonic maps ansatz to find exact solutions of the Einstein-Maxwell-Dilaton-Axion (EMDA) equations. The solutions are harmonic maps invariant to the symplectic real group in four dimensions $Sp(4,\Rreal)\sim O(5)$. We find solutions of the EMDA field equations for the one and two dimensional subspaces of th... |
0811.2714 | Sergio Zerbini | Guido Cognola and Sergio Zerbini | Generalized modified gravity models: the stability issue | 10 pages, contribution to the anniversary volume "The Problems of
Modern Cosmology", on the occasion of the 50th birthday of Prof. S. D.
Odintsov. Editor: Prof. P. M. Lavrov, Tomsk State Pedagogical University | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A brief introduction on the issue of stability in generalized modified
gravity is presented and the dynamical system methods are used in the
investigation of the stability of spatially flat homogeneous cosmologies within
a large class of generalized modified gravity models in the presence of a
relativistic matter-rad... | [
{
"created": "Mon, 17 Nov 2008 15:04:31 GMT",
"version": "v1"
}
] | 2008-11-18 | [
[
"Cognola",
"Guido",
""
],
[
"Zerbini",
"Sergio",
""
]
] | A brief introduction on the issue of stability in generalized modified gravity is presented and the dynamical system methods are used in the investigation of the stability of spatially flat homogeneous cosmologies within a large class of generalized modified gravity models in the presence of a relativistic matter-radia... |
0709.4257 | Alexis Larranaga | Alexis Larranaga | Thermodynamical Analogy Between BTZ Black Holes and Effective String
Theory | 6 pages. References updated | null | null | null | gr-qc | null | In this paper we study the first law of thermodynamics for the (2+1)
dimensional BTZ rotating black hole considering a pair of thermodinamical
systems constructed with the two horizons of this solution. We show that these
two systems are similar to the right and left movers of string theory and that
the temperature a... | [
{
"created": "Wed, 26 Sep 2007 20:26:16 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Oct 2007 17:17:25 GMT",
"version": "v2"
}
] | 2007-10-09 | [
[
"Larranaga",
"Alexis",
""
]
] | In this paper we study the first law of thermodynamics for the (2+1) dimensional BTZ rotating black hole considering a pair of thermodinamical systems constructed with the two horizons of this solution. We show that these two systems are similar to the right and left movers of string theory and that the temperature ass... |
1606.05981 | Parthapratim Pradhan | Parthapratim Pradhan | Area products for ${\cal H}^{\pm}$ in AdS space | 20 pages, 6 figures | Galaxies 2017, 5(1), 10 | 10.3390/galaxies5010010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the thermodynamic products particularly area (or entropy) products
of ${\cal H}^{\pm}$ for certain class of black holes in AdS space. We show by
explicit and exact calculations that more complicated function of event horizon
area and Cauchy horizon area is indeed mass-independent. This mass-independent
quan... | [
{
"created": "Mon, 20 Jun 2016 06:09:40 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Oct 2016 15:52:32 GMT",
"version": "v2"
}
] | 2017-02-07 | [
[
"Pradhan",
"Parthapratim",
""
]
] | We derive the thermodynamic products particularly area (or entropy) products of ${\cal H}^{\pm}$ for certain class of black holes in AdS space. We show by explicit and exact calculations that more complicated function of event horizon area and Cauchy horizon area is indeed mass-independent. This mass-independent quanti... |
2304.12359 | Sapam Gayatri Devi | Sapam Gayatri Devi, I. Ablu Meitei, T. Ibungochouba Singh, Aheibam
Keshwarjit Singh and K. Yugindro Singh | Hawking radiation of rotating BTZ Black hole based on modified
dispersion relation and Rarita-Schwinger equation | 15 pages, 2 figures and submitted to International Journal of Modern
Physics A bearing revised manuscript number IJMPA-D-23-00039R1 | null | 10.1142/S0217751X23500689 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, tunneling of fermions from rotating BTZ black hole is
investigated using modified dispersion relation (MDR) and Rarita-Schwinger
equation. The effect of modified dispersion relation (MDR) on the tunneling of
fermions rises the Hawking temperature of rotating BTZ black hole. It is
observed that the modi... | [
{
"created": "Mon, 24 Apr 2023 18:00:39 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Devi",
"Sapam Gayatri",
""
],
[
"Meitei",
"I. Ablu",
""
],
[
"Singh",
"T. Ibungochouba",
""
],
[
"Singh",
"Aheibam Keshwarjit",
""
],
[
"Singh",
"K. Yugindro",
""
]
] | In this paper, tunneling of fermions from rotating BTZ black hole is investigated using modified dispersion relation (MDR) and Rarita-Schwinger equation. The effect of modified dispersion relation (MDR) on the tunneling of fermions rises the Hawking temperature of rotating BTZ black hole. It is observed that the modifi... |
gr-qc/0407076 | Lawrence P. Horwitz | Lawrence P. Horwitz and Ori Oron | Classical Gravity as an Eikonal Approximation to a Manifestly Lorentz
Covariant Quantum Theory with Brownian Interpretation | 46 pages, PLain TeX. To be published in "Progress in General
Relativity and Quantum Cosmology Research". Hauppage (2004) | null | null | YAUP 2775-04 | gr-qc | null | We discuss in this Chapter a series of theoretical developments which
motivate the introduction of a quantum evolution equation for which the eikonal
approximation results in the geodesics of a four dimensional manifold. This
geodesic motion can be put into correspondence with general relativity. One
obtains in this ... | [
{
"created": "Tue, 20 Jul 2004 08:58:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Horwitz",
"Lawrence P.",
""
],
[
"Oron",
"Ori",
""
]
] | We discuss in this Chapter a series of theoretical developments which motivate the introduction of a quantum evolution equation for which the eikonal approximation results in the geodesics of a four dimensional manifold. This geodesic motion can be put into correspondence with general relativity. One obtains in this wa... |
2406.18604 | Jitendra Kumar Dr. | Sourav Chaudharya, Sunil Kumar Maurya, Jitendra Kumara, Ghulam Mustafa | Most general isotropic charged fluid solution for Buchdahl model in
$\mathscr{F}(Q)$ gravity | 11 figures and 5 Tables | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we investigated a most general isotropic charged fluid solution
for the Buchdahl model via a two-step method in $\mathscr{F}(Q)$-gravity
framework for the first time. In this context, a linear function of the form
$\mathscr{F}(Q)=\zeta_1 Q+\zeta_2$ and a particular transformation is used to
solve the Ei... | [
{
"created": "Thu, 20 Jun 2024 01:33:46 GMT",
"version": "v1"
}
] | 2024-06-28 | [
[
"Chaudharya",
"Sourav",
""
],
[
"Maurya",
"Sunil Kumar",
""
],
[
"Kumara",
"Jitendra",
""
],
[
"Mustafa",
"Ghulam",
""
]
] | In this work, we investigated a most general isotropic charged fluid solution for the Buchdahl model via a two-step method in $\mathscr{F}(Q)$-gravity framework for the first time. In this context, a linear function of the form $\mathscr{F}(Q)=\zeta_1 Q+\zeta_2$ and a particular transformation is used to solve the Eins... |
1002.1737 | Luc Nguyen | Piotr T. Chru\'sciel and Luc Nguyen | A uniqueness theorem for degenerate Kerr-Newman black holes | null | Ann. Henri Poincar\'e 11 (2010), no. 4, 585-609 | 10.1007/s00023-010-0038-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the domains of dependence of stationary, $I^+$-regular,
analytic, electrovacuum space-times with a connected, non-empty, rotating,
degenerate event horizon arise from Kerr-Newman space-times.
| [
{
"created": "Mon, 8 Feb 2010 23:19:01 GMT",
"version": "v1"
}
] | 2014-10-14 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Nguyen",
"Luc",
""
]
] | We show that the domains of dependence of stationary, $I^+$-regular, analytic, electrovacuum space-times with a connected, non-empty, rotating, degenerate event horizon arise from Kerr-Newman space-times. |
1212.0629 | Sumati Surya | Surbhi Khetrapal and Sumati Surya | Boundary Term Contribution to the Volume of a Small Causal Diamond | 18 pages, 2 figures | null | 10.1088/0264-9381/30/6/065005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In his calculation of the spacetime volume of a small Alexandrov interval in
4 dimensions Myrheim introduced a term which he referred to as a surface
integral [1]. The evaluation of this term has remained opaque and led
subsequent authors to evaluate the volume using other techniques [2]. It is the
purpose of this wo... | [
{
"created": "Tue, 4 Dec 2012 07:23:30 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Khetrapal",
"Surbhi",
""
],
[
"Surya",
"Sumati",
""
]
] | In his calculation of the spacetime volume of a small Alexandrov interval in 4 dimensions Myrheim introduced a term which he referred to as a surface integral [1]. The evaluation of this term has remained opaque and led subsequent authors to evaluate the volume using other techniques [2]. It is the purpose of this work... |
0911.0756 | Vladimir S. Manko | I. Cabrera-Munguia, V.S. Manko, E. Ruiz | A combined Majumdar-Papapetrou-Bonnor field as extreme limit of the
double-Reissner-Nordstrom solution | 10 pages, 3 figures, title changed, the result extended, matching the
published version | Gen. Rel. Grav. 43:1593-1606,2011 | 10.1007/s10714-011-1142-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The general extreme limit of the double-Reissner-Nordstrom solution is worked
out in explicit analytical form involving prolate spheroidal coordinates. We
name it the combined Majumdar-Papapetrou-Bonnor field to underline the fact
that it contains as particular cases the two-body specialization of the
well-known Maju... | [
{
"created": "Wed, 4 Nov 2009 09:33:52 GMT",
"version": "v1"
},
{
"created": "Fri, 13 May 2011 23:31:51 GMT",
"version": "v2"
}
] | 2011-07-26 | [
[
"Cabrera-Munguia",
"I.",
""
],
[
"Manko",
"V. S.",
""
],
[
"Ruiz",
"E.",
""
]
] | The general extreme limit of the double-Reissner-Nordstrom solution is worked out in explicit analytical form involving prolate spheroidal coordinates. We name it the combined Majumdar-Papapetrou-Bonnor field to underline the fact that it contains as particular cases the two-body specialization of the well-known Majumd... |
2406.06091 | Andrea Pierfrancesco Sanna | Mariano Cadoni, Mirko Pitzalis, Davi C. Rodrigues and Andrea P. Sanna | Cosmological coupling of local gravitational systems | 27 pages, 7 figures. Some typos corrected, one reference added | null | null | null | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | We investigate the cosmological coupling of spherical, local astrophysical
systems. We derive a general formula quantifying the cosmological coupling of
the Misner-Sharp mass of these objects. We show that, in the weak-field limit,
the cosmological coupling is only allowed if there are pressure anisotropies.
We also ... | [
{
"created": "Mon, 10 Jun 2024 08:20:24 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jun 2024 14:18:38 GMT",
"version": "v2"
}
] | 2024-06-18 | [
[
"Cadoni",
"Mariano",
""
],
[
"Pitzalis",
"Mirko",
""
],
[
"Rodrigues",
"Davi C.",
""
],
[
"Sanna",
"Andrea P.",
""
]
] | We investigate the cosmological coupling of spherical, local astrophysical systems. We derive a general formula quantifying the cosmological coupling of the Misner-Sharp mass of these objects. We show that, in the weak-field limit, the cosmological coupling is only allowed if there are pressure anisotropies. We also ap... |
gr-qc/0302113 | Kenji Sakamoto | Kenji Sakamoto, Kiyoshi Shiraishi (Yamaguchi University) | Quantum Scattering in Two Black Hole Moduli Space | 15 pages, 19 figures, RevTeX 3.0 | Phys.Rev. D68 (2003) 025019 | 10.1103/PhysRevD.68.025019 | null | gr-qc hep-th | null | We discuss the quantum scattering process in the moduli space consisting of
two maximally charged dilaton black holes. The black hole moduli space geometry
has different structures for arbitrary dimensions and various values of dilaton
coupling. We study the quantum effects of the different moduli space geometries
wi... | [
{
"created": "Thu, 27 Feb 2003 08:25:44 GMT",
"version": "v1"
},
{
"created": "Thu, 1 May 2003 08:06:54 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Sakamoto",
"Kenji",
"",
"Yamaguchi University"
],
[
"Shiraishi",
"Kiyoshi",
"",
"Yamaguchi University"
]
] | We discuss the quantum scattering process in the moduli space consisting of two maximally charged dilaton black holes. The black hole moduli space geometry has different structures for arbitrary dimensions and various values of dilaton coupling. We study the quantum effects of the different moduli space geometries with... |
2003.07436 | Luis Herrera | L. Herrera | Landauer Principle and General Relativity | Published in the special issue of Entropy: The Landauer Principle:
Meaning, Physical Roots and Applications | Entropy, 22, 340, (2020) | 10.3390/e22030340 | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We endeavour to illustrate the physical relevance of the Landauer principle
applying it to different important issues concerning the theory of gravitation.
We shall first analyze, in the context of general relativity, the consequences
derived from the fact, implied by Landauer principle, that information has
mass. Ne... | [
{
"created": "Mon, 16 Mar 2020 20:41:26 GMT",
"version": "v1"
}
] | 2020-04-22 | [
[
"Herrera",
"L.",
""
]
] | We endeavour to illustrate the physical relevance of the Landauer principle applying it to different important issues concerning the theory of gravitation. We shall first analyze, in the context of general relativity, the consequences derived from the fact, implied by Landauer principle, that information has mass. Next... |
gr-qc/9901005 | Garcia | L.C.Garcia de Andrade | On non-Riemannian Superconductors and torsion loops | Latex file,6 pages | null | null | null | gr-qc | null | The geometrization of electrodynamics is obtained by performing the complex
extension of the covariant derivative operator to include the Cartan torsion
vector and applying this derivative to the Ginzburg-Landau equation of
superfluids and Superconductors.It is shown that the introduction of torsion
makes a shift in ... | [
{
"created": "Mon, 4 Jan 1999 17:38:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Andrade",
"L. C. Garcia",
""
]
] | The geometrization of electrodynamics is obtained by performing the complex extension of the covariant derivative operator to include the Cartan torsion vector and applying this derivative to the Ginzburg-Landau equation of superfluids and Superconductors.It is shown that the introduction of torsion makes a shift in th... |
1409.2688 | Cornelius Rampf | Cornelius Rampf and Alexander Wiegand | Relativistic Lagrangian displacement field and tensor perturbations | 19 pages, two figures, improved discussion, matches published version | Phys. Rev. D 90, 123503 (2014) | 10.1103/PhysRevD.90.123503 | AEI-2014-043 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the purely spatial Lagrangian coordinate transformation from
the Lagrangian to the basic Eulerian frame. We demonstrate three techniques for
extracting the relativistic displacement field from a given solution in the
Lagrangian frame. These techniques are (a) from defining a local set of
Eulerian coord... | [
{
"created": "Fri, 5 Sep 2014 20:00:04 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Dec 2014 09:43:14 GMT",
"version": "v2"
}
] | 2014-12-16 | [
[
"Rampf",
"Cornelius",
""
],
[
"Wiegand",
"Alexander",
""
]
] | We investigate the purely spatial Lagrangian coordinate transformation from the Lagrangian to the basic Eulerian frame. We demonstrate three techniques for extracting the relativistic displacement field from a given solution in the Lagrangian frame. These techniques are (a) from defining a local set of Eulerian coordin... |
2203.03049 | Bence Racsk\'o | Bence Racsk\'o | Variational formalism for generic shells in general relativity | null | Class. Quantum Grav. 39 015004 (2022) | 10.1088/1361-6382/ac38d2 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the variational principle for the gravitational field in the
presence of thin shells of completely unconstrained signature (generic shells).
Such variational formulations have been given before for shells of timelike and
null signatures separately, but so far no unified treatment exists. We identify
th... | [
{
"created": "Sun, 6 Mar 2022 20:49:37 GMT",
"version": "v1"
}
] | 2022-03-08 | [
[
"Racskó",
"Bence",
""
]
] | We investigate the variational principle for the gravitational field in the presence of thin shells of completely unconstrained signature (generic shells). Such variational formulations have been given before for shells of timelike and null signatures separately, but so far no unified treatment exists. We identify the ... |
0809.2022 | Patrick Peter | Patrick Peter and Nelson Pinto-Neto | Cosmology without inflation | 8 pages, no figure | Phys.Rev.D78:063506,2008 | 10.1103/PhysRevD.78.063506 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new cosmological paradigm in which our observed expanding phase
is originated from an initially large contracting Universe that subsequently
experienced a bounce. This category of models, being geodesically complete, is
non-singular and horizon-free, and can be made to prevent any relevant scale to
ever ... | [
{
"created": "Thu, 11 Sep 2008 15:29:49 GMT",
"version": "v1"
}
] | 2008-11-07 | [
[
"Peter",
"Patrick",
""
],
[
"Pinto-Neto",
"Nelson",
""
]
] | We propose a new cosmological paradigm in which our observed expanding phase is originated from an initially large contracting Universe that subsequently experienced a bounce. This category of models, being geodesically complete, is non-singular and horizon-free, and can be made to prevent any relevant scale to ever ha... |
0811.4329 | David Langlois | David Langlois | Early Universe: inflation and cosmological perturbations | Talk given at the workshop "Geometry, Topology, QFT and Cosmology",
Paris (28-30 May 2008); 23 pages | null | null | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After a brief summary of general relativity and cosmology, we present the
basic concepts underlying inflation, the currently best motivated models for
the early Universe. We describe the simplest inflation models, based on a
single scalar field, and discuss how primordial cosmological perturbations are
generated. We ... | [
{
"created": "Wed, 26 Nov 2008 14:47:32 GMT",
"version": "v1"
}
] | 2008-11-27 | [
[
"Langlois",
"David",
""
]
] | After a brief summary of general relativity and cosmology, we present the basic concepts underlying inflation, the currently best motivated models for the early Universe. We describe the simplest inflation models, based on a single scalar field, and discuss how primordial cosmological perturbations are generated. We th... |
0811.4020 | Peter Hogan | T. Futamase, P. A. Hogan and Y. Itoh | Equations of Motion in General Relativity of a Small Charged Black Hole | 31 pages, Latex file | Phys.Rev.D78:104014,2008 | 10.1103/PhysRevD.78.104014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the details of a model in general relativity of a small charged
black hole moving in an external gravitational and electromagnetic field. The
importance of our model lies in the fact that we can derive the equations of
motion of the black hole from the Einstein-Maxwell vacuum field equations
without encoun... | [
{
"created": "Tue, 25 Nov 2008 07:03:16 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Futamase",
"T.",
""
],
[
"Hogan",
"P. A.",
""
],
[
"Itoh",
"Y.",
""
]
] | We present the details of a model in general relativity of a small charged black hole moving in an external gravitational and electromagnetic field. The importance of our model lies in the fact that we can derive the equations of motion of the black hole from the Einstein-Maxwell vacuum field equations without encounte... |
1303.4635 | Badri Krishnan | Badri Krishnan | Quasi-local black hole horizons | 41 pages, 12 Figures. To appear in the Springer Handbook of
Spacetime, Springer Verlag (2013) | null | 10.1007/978-3-642-41992-8_25 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article introduces the subject of quasi-local horizons at a level
suitable for physics graduate students who have taken a first course on general
relativity. It reviews properties of trapped surfaces and trapped regions in
some simple examples, general properties of trapped surfaces including their
stability pro... | [
{
"created": "Tue, 19 Mar 2013 15:24:22 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Krishnan",
"Badri",
""
]
] | This article introduces the subject of quasi-local horizons at a level suitable for physics graduate students who have taken a first course on general relativity. It reviews properties of trapped surfaces and trapped regions in some simple examples, general properties of trapped surfaces including their stability prope... |
1211.1373 | Christian Corda cordac | Christian Corda | Dark Energy and Dark Matter like intrinsic curvature in extended
gravity. Viability through gravitational waves | 13 pages, short review commissioned and accepted for publication by
New Adv. Phys. To appear in Issue 7(1) 2013 on Dark Energy | New Advances in Physics, Vol. 7, No. 1, January-June 2013, Pp.
67-83 | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Towards the goal to quantize gravity, in this short review we discuss an
intermediate step which consists in extending the picture of standard General
Relativity by considering Extended Theories of Gravity. In this tapestry, the
equations to quantize are not the standard Einstein field equations of General
Relativity... | [
{
"created": "Tue, 6 Nov 2012 08:27:34 GMT",
"version": "v1"
}
] | 2014-03-03 | [
[
"Corda",
"Christian",
""
]
] | Towards the goal to quantize gravity, in this short review we discuss an intermediate step which consists in extending the picture of standard General Relativity by considering Extended Theories of Gravity. In this tapestry, the equations to quantize are not the standard Einstein field equations of General Relativity, ... |
2308.12236 | Angel Rincon | Gabriel Abell\'an, Angel Rincon and Eduard Sanchez | A Generalized Double Chaplygin Model for Anisotropic Matter: The
Newtonian Case | 14 pages, 3 figures. Matches the published version (invited
contribution to the Journal Universe) | Universe 9 (2023) 1-14 | 10.3390/universe9080352 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate astrophysical systems in a Newtonian regime
using anisotropic matter. For this purpose, we considered that both radial and
tangential pressures satisfy a generalized Chaplygin-type equation of state.
Using this model, we found the Lane--Emden equation for this system and solved
it numeric... | [
{
"created": "Wed, 23 Aug 2023 16:22:33 GMT",
"version": "v1"
}
] | 2023-08-24 | [
[
"Abellán",
"Gabriel",
""
],
[
"Rincon",
"Angel",
""
],
[
"Sanchez",
"Eduard",
""
]
] | In this work, we investigate astrophysical systems in a Newtonian regime using anisotropic matter. For this purpose, we considered that both radial and tangential pressures satisfy a generalized Chaplygin-type equation of state. Using this model, we found the Lane--Emden equation for this system and solved it numerical... |
2006.11503 | Shao-Wen Wei | Shao-Wen Wei, Yu-Xiao Liu, Robert B. Mann | Novel dual relation and constant in Hawking-Page phase transitions | 5 pages and 4 figures | Phys. Rev. D 102, 104011 (2020) | 10.1103/PhysRevD.102.104011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Universal relations and constants have important applications in
understanding a physical theory. In this article, we explore this issue for
Hawking-Page phase transitions in Schwarzschild anti-de Sitter black holes. We
find a novel exact dual relation between the minimum temperature of the
($d$+1)-dimensional black ... | [
{
"created": "Sat, 20 Jun 2020 06:49:23 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Nov 2020 06:22:38 GMT",
"version": "v2"
}
] | 2020-11-10 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
],
[
"Mann",
"Robert B.",
""
]
] | Universal relations and constants have important applications in understanding a physical theory. In this article, we explore this issue for Hawking-Page phase transitions in Schwarzschild anti-de Sitter black holes. We find a novel exact dual relation between the minimum temperature of the ($d$+1)-dimensional black ho... |
gr-qc/0701128 | Jarmo M\"akel\"a Dr. | Jarmo Makela | Quantum-Mechanical Model of Spacetime | 46 pages, no figures. References added and a list of references
partly re-organized. Typos corrected. Minor changes in section 7 | null | null | null | gr-qc | null | We consider a possibility to construct a quantum-mechanical model of
spacetime, where Planck size quantum black holes act as the fundamental
constituents of space and time. Spacetime is assumed to be a graph, where black
holes lie on the vertices. Our model implies that area has a discrete spectrum
with equal spacing... | [
{
"created": "Wed, 24 Jan 2007 10:34:26 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Feb 2007 07:12:50 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Jun 2007 04:59:16 GMT",
"version": "v3"
}
] | 2007-06-20 | [
[
"Makela",
"Jarmo",
""
]
] | We consider a possibility to construct a quantum-mechanical model of spacetime, where Planck size quantum black holes act as the fundamental constituents of space and time. Spacetime is assumed to be a graph, where black holes lie on the vertices. Our model implies that area has a discrete spectrum with equal spacing. ... |
1011.3824 | Jacek Gruszczak | Jacek Gruszczak | Smooth Beginning of the Universe | some typos corrected, acknowledgements and references added | null | null | null | gr-qc astro-ph.CO math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The breaking down of the equivalence principle, when discussed in the context
of Sikorski's differential spaces theory, leads to the definition of the
so-called differentially singular boundary (d-boundary) and to the concept of
differential space with singularity associated with a given space-time
differential manif... | [
{
"created": "Tue, 16 Nov 2010 21:03:40 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jul 2011 00:34:09 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Jan 2012 17:26:14 GMT",
"version": "v3"
}
] | 2012-01-11 | [
[
"Gruszczak",
"Jacek",
""
]
] | The breaking down of the equivalence principle, when discussed in the context of Sikorski's differential spaces theory, leads to the definition of the so-called differentially singular boundary (d-boundary) and to the concept of differential space with singularity associated with a given space-time differential manifol... |
0911.4440 | Harvey R. Brown | Harvey R Brown | The behaviour of rods and clocks in general relativity, and the meaning
of the metric field | 14 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The notion that the metric field in general relativity can be understood as a
property of space-time rests on a feature of the theory sometimes called
universal coupling -- the claim that rods and clocks "measure" the metric in a
way that is independent of their constitution. It is pointed out that this
feature is no... | [
{
"created": "Mon, 23 Nov 2009 16:26:02 GMT",
"version": "v1"
}
] | 2009-11-24 | [
[
"Brown",
"Harvey R",
""
]
] | The notion that the metric field in general relativity can be understood as a property of space-time rests on a feature of the theory sometimes called universal coupling -- the claim that rods and clocks "measure" the metric in a way that is independent of their constitution. It is pointed out that this feature is not ... |
0811.0354 | Mihalis Dafermos | Mihalis Dafermos and Igor Rodnianski | Lectures on black holes and linear waves | 116 pages, 21 figures | Clay Mathematics Proceedings, Vol. 17, Amer. Math. Soc.,
Providence, RI, 2013, pp. 97-205 | null | null | gr-qc math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These lecture notes, based on a course given at the Zurich Clay Summer School
(June 23-July 18, 2008), review our current mathematical understanding of the
global behaviour of waves on black hole exterior backgrounds. Interest in this
problem stems from its relationship to the non-linear stability of the black
hole s... | [
{
"created": "Mon, 3 Nov 2008 18:09:16 GMT",
"version": "v1"
}
] | 2013-12-03 | [
[
"Dafermos",
"Mihalis",
""
],
[
"Rodnianski",
"Igor",
""
]
] | These lecture notes, based on a course given at the Zurich Clay Summer School (June 23-July 18, 2008), review our current mathematical understanding of the global behaviour of waves on black hole exterior backgrounds. Interest in this problem stems from its relationship to the non-linear stability of the black hole spa... |
gr-qc/0208015 | Raul Vera | Raul Vera | Symmetry-preserving matchings | LaTeX, 19 pages | Class.Quant.Grav. 19 (2002) 5249-5264 | 10.1088/0264-9381/19/20/316 | null | gr-qc | null | In the literature, the matchings between spacetimes have been most of the
times implicitly assumed to preserve some of the symmetries of the problem
involved. But no definition for this kind of matching was given until recently.
Loosely speaking, the matching hypersurface is restricted to be tangent to the
orbits of ... | [
{
"created": "Tue, 6 Aug 2002 15:14:33 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Vera",
"Raul",
""
]
] | In the literature, the matchings between spacetimes have been most of the times implicitly assumed to preserve some of the symmetries of the problem involved. But no definition for this kind of matching was given until recently. Loosely speaking, the matching hypersurface is restricted to be tangent to the orbits of a ... |
0710.1450 | Sergei Kopeikin | S.M. Kopeikin (University of Missouri-Columbia, USA), E. Pavlis
(JCET/UMBC - NASA Goddard, USA), D. Pavlis (SGT Inc., USA), V.A. Brumberg
(Inst. Appl. Astron., Russia), A. Escapa (Univ. of Alicante, Spain), J.
Getino (Univ. of Valladolid, Spain), A. Gusev (Kazan State University,
Russia), J. Mueller (Leibniz Un... | Prospects in the orbital and rotational dynamics of the Moon with the
advent of sub-centimeter lunar laser ranging | 26 pages, submitted to Proc. of ASTROCON-IV conference (Princeton
Univ., NJ, 2007) | Adv.SpaceRes.42:1378-1390,2008 | 10.1016/j.asr.2008.02.014 | null | gr-qc | null | Lunar Laser Ranging (LLR) measurements are crucial for advanced exploration
of the laws of fundamental gravitational physics and geophysics. Current LLR
technology allows us to measure distances to the Moon with a precision
approaching 1 millimeter. As NASA pursues the vision of taking humans back to
the Moon, new, m... | [
{
"created": "Mon, 8 Oct 2007 01:11:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kopeikin",
"S. M.",
"",
"University of Missouri-Columbia, USA"
],
[
"Pavlis",
"E.",
"",
"JCET/UMBC - NASA Goddard, USA"
],
[
"Pavlis",
"D.",
"",
"SGT Inc., USA"
],
[
"Brumberg",
"V. A.",
"",
"Inst. Appl. Astron., Russia"
],
[
"Es... | Lunar Laser Ranging (LLR) measurements are crucial for advanced exploration of the laws of fundamental gravitational physics and geophysics. Current LLR technology allows us to measure distances to the Moon with a precision approaching 1 millimeter. As NASA pursues the vision of taking humans back to the Moon, new, mor... |
gr-qc/0703053 | Emanuele Berti | Emanuele Berti, Vitor Cardoso, Jose A. Gonzalez, Ulrich Sperhake, Mark
Hannam, Sascha Husa, Bernd Bruegmann | Inspiral, merger and ringdown of unequal mass black hole binaries: a
multipolar analysis | 51 pages, 28 figures, 16 tables. Many improvements throughout the
text in response to the referee report. The calculation of multipolar
components in Appendix A now uses slightly different conventions. Matches
version in press in PRD | Phys.Rev.D76:064034,2007 | 10.1103/PhysRevD.76.064034 | null | gr-qc astro-ph | null | We study the inspiral, merger and ringdown of unequal mass black hole
binaries by analyzing a catalogue of numerical simulations for seven different
values of the mass ratio (from q=M2/M1=1 to q=4). We compare numerical and
Post-Newtonian results by projecting the waveforms onto spin-weighted spherical
harmonics, cha... | [
{
"created": "Thu, 8 Mar 2007 14:25:24 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Sep 2007 22:40:35 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Berti",
"Emanuele",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Gonzalez",
"Jose A.",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Hannam",
"Mark",
""
],
[
"Husa",
"Sascha",
""
],
[
"Bruegmann",
"Bernd",
""
]
] | We study the inspiral, merger and ringdown of unequal mass black hole binaries by analyzing a catalogue of numerical simulations for seven different values of the mass ratio (from q=M2/M1=1 to q=4). We compare numerical and Post-Newtonian results by projecting the waveforms onto spin-weighted spherical harmonics, chara... |
2205.11671 | Benito A. Ju\'arez-Aubry | Benito A. Ju\'arez-Aubry, Bernard S. Kay, Tonatiuh Miramontes, Daniel
Sudarsky | On the initial value problem for semiclassical gravity without and with
quantum state collapses | 47 pages. Corrections implemented, notably Def 11 (preliminary
surface Hadamard condition) and certain equations on p. 33. Explanations
improved and typos fixed. This version corresponds largely to the published
version in JCAP | JCAP 01 (2023), 040 | 10.1088/1475-7516/2023/01/040 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore how the initial value problem may be formulated for globally
hyperbolic, Hadamard, solutions of the semiclassical Einstein-Klein-Gordon
equations. Given a set of data on an initial 3-surface, consisting of the
values on the surface of a spacetime metric and its first 3 time derivatives
off the surface, we ... | [
{
"created": "Mon, 23 May 2022 23:39:18 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Aug 2022 15:48:23 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Nov 2022 18:03:19 GMT",
"version": "v3"
},
{
"created": "Sun, 27 Nov 2022 14:53:19 GMT",
"version": "v4"
},
{
"c... | 2023-03-13 | [
[
"Juárez-Aubry",
"Benito A.",
""
],
[
"Kay",
"Bernard S.",
""
],
[
"Miramontes",
"Tonatiuh",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | We explore how the initial value problem may be formulated for globally hyperbolic, Hadamard, solutions of the semiclassical Einstein-Klein-Gordon equations. Given a set of data on an initial 3-surface, consisting of the values on the surface of a spacetime metric and its first 3 time derivatives off the surface, we in... |
1112.6333 | Francisco Lobo | Francisco S. N. Lobo | Wormhole geometries in modified gravity | 4 pages, Prepared for the proceedings of the Spanish Relativity
meeting (ERE2011), Madrid, Spain, 29Aug-2Sep 2011 | AIP Conf.Proc. 1458 (2011) 447-450 | 10.1063/1.4734456 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A fundamental ingredient in wormhole physics is the presence of exotic
matter, which involves the violation of the null energy condition. Although a
plethora of wormhole solutions have been explored in the literature, it is
useful to find geometries that minimize the usage of exotic matter. In the
context of modified... | [
{
"created": "Thu, 29 Dec 2011 15:40:11 GMT",
"version": "v1"
}
] | 2012-07-19 | [
[
"Lobo",
"Francisco S. N.",
""
]
] | A fundamental ingredient in wormhole physics is the presence of exotic matter, which involves the violation of the null energy condition. Although a plethora of wormhole solutions have been explored in the literature, it is useful to find geometries that minimize the usage of exotic matter. In the context of modified g... |
1912.05419 | Lu\'is Felipe Longo Micchi Mr. | Luis Felipe Longo Micchi and Cecilia Chirenti | Spicing up the recipe for echoes from exotic compact objects: orbital
differences and corrections in rotating backgrounds | 11 pages, 10 figures. Accepted for publication on PRD. Inclusion of a
brief discussion about the influence of the increase of the central object's
spin | Phys. Rev. D 101, 084010 (2020) | 10.1103/PhysRevD.101.084010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently it has been argued that near-horizon modifications of the standard
(classical) black hole spacetime could lead to observable alterations of the
gravitational waveform generated by a binary black hole coalescence. Such
modifications can be inspired by quantum gravity considerations, resulting in
speculative h... | [
{
"created": "Wed, 11 Dec 2019 16:23:03 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Mar 2020 23:34:59 GMT",
"version": "v2"
}
] | 2020-04-08 | [
[
"Micchi",
"Luis Felipe Longo",
""
],
[
"Chirenti",
"Cecilia",
""
]
] | Recently it has been argued that near-horizon modifications of the standard (classical) black hole spacetime could lead to observable alterations of the gravitational waveform generated by a binary black hole coalescence. Such modifications can be inspired by quantum gravity considerations, resulting in speculative hor... |
0902.3163 | Baojiu Li | Baojiu Li, John D. Barrow | Does Bulk Viscosity Create a Viable Unified Dark Matter Model? | 9 pages, 5 figures, references and comments added; to appear in Phys.
Rev. D | Phys.Rev.D79:103521,2009 | 10.1103/PhysRevD.79.103521 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate in detail the possibility that a single imperfect fluid with
bulk viscosity can replace the need for separate dark matter and dark energy in
cosmological models. With suitable choices of model parameters, we show that
the background cosmology in this model can mimic that of a LCDM Universe to
high prec... | [
{
"created": "Wed, 18 Feb 2009 15:26:03 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Apr 2009 12:06:59 GMT",
"version": "v2"
},
{
"created": "Mon, 11 May 2009 23:20:01 GMT",
"version": "v3"
}
] | 2009-07-30 | [
[
"Li",
"Baojiu",
""
],
[
"Barrow",
"John D.",
""
]
] | We investigate in detail the possibility that a single imperfect fluid with bulk viscosity can replace the need for separate dark matter and dark energy in cosmological models. With suitable choices of model parameters, we show that the background cosmology in this model can mimic that of a LCDM Universe to high precis... |
1710.07373 | Thomas W. Baumgarte | Kenneth A. Dennison and Thomas W. Baumgarte | Schwarzschild-de Sitter Spacetimes, McVittie Coordinates, and Trumpet
Geometries | 7 pages, 3 figures, added reference | Phys. Rev. D 96, 124014 (2017) | 10.1103/PhysRevD.96.124014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Trumpet geometries play an important role in numerical simulations of black
hole spacetimes, which are usually performed under the assumption of asymptotic
flatness. Our Universe is not asymptotically flat, however, which has motivated
numerical studies of black holes in asymptotically de Sitter spacetimes. We
derive... | [
{
"created": "Thu, 19 Oct 2017 23:43:58 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Nov 2017 13:46:11 GMT",
"version": "v2"
}
] | 2017-12-20 | [
[
"Dennison",
"Kenneth A.",
""
],
[
"Baumgarte",
"Thomas W.",
""
]
] | Trumpet geometries play an important role in numerical simulations of black hole spacetimes, which are usually performed under the assumption of asymptotic flatness. Our Universe is not asymptotically flat, however, which has motivated numerical studies of black holes in asymptotically de Sitter spacetimes. We derive a... |
1007.4546 | J. A. de Freitas Pacheco | Alain de Roany, J.A. de Freitas Pacheco | Continuous matter creation and the acceleration of the universe: the
growth of density fluctuations | 11 pages, 2 figures, accepted for publication in General Relativity
and Gravitation | Gen.Rel.Grav.43:61-72,2011 | 10.1007/s10714-010-1069-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmologies including continuous matter creation are able to reproduce the
main properties of the standard $\Lambda$CDM model, in particular in cases
where the particle and entropy production rates are equal. These specific
models, characterized by a mass density equal to the critical value, behave
like the standard ... | [
{
"created": "Mon, 26 Jul 2010 19:57:05 GMT",
"version": "v1"
}
] | 2011-03-07 | [
[
"de Roany",
"Alain",
""
],
[
"Pacheco",
"J. A. de Freitas",
""
]
] | Cosmologies including continuous matter creation are able to reproduce the main properties of the standard $\Lambda$CDM model, in particular in cases where the particle and entropy production rates are equal. These specific models, characterized by a mass density equal to the critical value, behave like the standard $\... |
1912.09222 | Armando A Roque Roque | Armando A. Roque and J. Barranco | Confusing dark matter particle properties with modifications to General
Relativity | Accepted for publication in Physical Review D | Phys. Rev. D 102, 104010 (2020) | 10.1103/PhysRevD.102.104010 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cold Dark Stars made of self-gravitating fermions in the degenerate limit are
constructed in General Relativity and in R-square gravity, $f(R)=R+\alpha R^2$.
The properties of the resulting Cold Dark Stars in both theories of gravity are
studied. It is found that the same gravitational potential is generated for
diff... | [
{
"created": "Thu, 19 Dec 2019 14:31:53 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Oct 2020 22:54:04 GMT",
"version": "v2"
}
] | 2020-11-11 | [
[
"Roque",
"Armando A.",
""
],
[
"Barranco",
"J.",
""
]
] | Cold Dark Stars made of self-gravitating fermions in the degenerate limit are constructed in General Relativity and in R-square gravity, $f(R)=R+\alpha R^2$. The properties of the resulting Cold Dark Stars in both theories of gravity are studied. It is found that the same gravitational potential is generated for differ... |
gr-qc/0012018 | Johan Braennlund | Ingemar Bengtsson, Johan Braennlund (Stockholm University) | 2+1 gravity, chaos and time machines | null | J.Math.Phys. 42 (2001) 3565-3579 | 10.1063/1.1378302 | SUITP 00-17 | gr-qc | null | 2+1 gravity for spacetimes with topology RxT^2 has been much studied. We add
a description of how to extend these spacetimes across a Cauchy horizon into a
region where the torus becomes Lorentzian. The result is a one parameter family
of tori given by a geodesic in the "Teichmueller space" of Lorentzian tori. We
des... | [
{
"created": "Tue, 5 Dec 2000 13:40:20 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Bengtsson",
"Ingemar",
"",
"Stockholm University"
],
[
"Braennlund",
"Johan",
"",
"Stockholm University"
]
] | 2+1 gravity for spacetimes with topology RxT^2 has been much studied. We add a description of how to extend these spacetimes across a Cauchy horizon into a region where the torus becomes Lorentzian. The result is a one parameter family of tori given by a geodesic in the "Teichmueller space" of Lorentzian tori. We descr... |
1509.07956 | Xuefeng Zhang | Xinliang An and Xuefeng Zhang | Examples of naked singularity formation in higher-dimensional
Einstein-vacuum spacetimes | 34 pages, 5 figures; to match the published version which combines
this number and arXiv:1509.07954 | Ann. Henri Poincare 19 (2018), 619-651 | 10.1007/s00023-017-0631-9 | null | gr-qc hep-th math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The vacuum Einstein equations in 5+1 dimensions are shown to admit solutions
describing naked singularity formation in gravitational collapse from
nonsingular asymptotically locally flat initial data that contain no trapped
surface. We present a class of specific examples with topology
$\mathbb{R}^{3+1} \times S^2$. ... | [
{
"created": "Sat, 26 Sep 2015 09:33:35 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Oct 2015 05:52:28 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Jan 2018 04:34:09 GMT",
"version": "v3"
}
] | 2018-02-07 | [
[
"An",
"Xinliang",
""
],
[
"Zhang",
"Xuefeng",
""
]
] | The vacuum Einstein equations in 5+1 dimensions are shown to admit solutions describing naked singularity formation in gravitational collapse from nonsingular asymptotically locally flat initial data that contain no trapped surface. We present a class of specific examples with topology $\mathbb{R}^{3+1} \times S^2$. Th... |
2106.02838 | Ratchaphat Nakarachinda | Ratchaphat Nakarachinda, Ekapong Hirunsirisawat, Lunchakorn Tannukij
and Pitayuth Wongjun | Effective thermodynamical system of Schwarzschild-de Sitter black holes
from R\'{e}nyi statistics | 41 pages, 14 figures | Phys. Rev. D 104, 064003 (2021) | 10.1103/PhysRevD.104.064003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been known that the Schwarzschild-de Sitter (Sch-dS) black hole may
not be in thermal equilibrium and also be found to be thermodynamically
unstable in the standard black hole thermodynamics. In the present work, we
investigate the possibility to realize the thermodynamical stability of the
Sch-dS black hole a... | [
{
"created": "Sat, 5 Jun 2021 08:37:59 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Sep 2021 16:50:42 GMT",
"version": "v2"
}
] | 2021-09-03 | [
[
"Nakarachinda",
"Ratchaphat",
""
],
[
"Hirunsirisawat",
"Ekapong",
""
],
[
"Tannukij",
"Lunchakorn",
""
],
[
"Wongjun",
"Pitayuth",
""
]
] | It has been known that the Schwarzschild-de Sitter (Sch-dS) black hole may not be in thermal equilibrium and also be found to be thermodynamically unstable in the standard black hole thermodynamics. In the present work, we investigate the possibility to realize the thermodynamical stability of the Sch-dS black hole as ... |
2207.00727 | Shahram Jalalzadeh | S. Jalalzadeh | Resolution of challenging problems in quantum cosmology with
electromagnetic radiation | 7 pages, to appear in Phys. Lett. B | Phys. Lett. B 833 (2022) 137285 | 10.1016/j.physletb.2022.137285 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the quantum cosmology of a closed spatially homogeneous and
isotropic Friedmann-Lema\^itre-Robertson-Walker (FLRW) minisuperspace model
with electromagnetic radiation as matter content. We solve the corresponding
Wheeler-DeWitt equation by utilizing Riemann's zeta function regularization
method. We dem... | [
{
"created": "Sat, 2 Jul 2022 03:36:30 GMT",
"version": "v1"
}
] | 2022-07-15 | [
[
"Jalalzadeh",
"S.",
""
]
] | We investigate the quantum cosmology of a closed spatially homogeneous and isotropic Friedmann-Lema\^itre-Robertson-Walker (FLRW) minisuperspace model with electromagnetic radiation as matter content. We solve the corresponding Wheeler-DeWitt equation by utilizing Riemann's zeta function regularization method. We demon... |
gr-qc/9912038 | Chamula Marian | V. Skalsky | A problem of hypothetical emerging of matter objects on horizon in the
standard model of universe | 3 pages | null | null | null | gr-qc | null | In the standard model of universe the increase in mass of our observed
expansive Universe is explained by the assumption of emerging the matter
objects on the horizon (of the most remote visibility). However, the physical
analysis of the influence of this assumption on the velocity of matter objects
shows unambiguous... | [
{
"created": "Fri, 10 Dec 1999 09:46:39 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Sep 2000 18:31:28 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Skalsky",
"V.",
""
]
] | In the standard model of universe the increase in mass of our observed expansive Universe is explained by the assumption of emerging the matter objects on the horizon (of the most remote visibility). However, the physical analysis of the influence of this assumption on the velocity of matter objects shows unambiguously... |
1711.02893 | Yu Li | Yu Li | Dynamics of two-scalar-field cosmological models beyond the exponential
potential | 12 pages,3 figures | International Journal of Modern Physics D Vol. 26 (2017) 1750164 | 10.1142/S0218271817501644 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we discuss the dynamics of two- scalar-field cosmological
models. Unlike in the situation of exponential potential, we find that there
are late-time attractors in which one scalar field dominates the energy density
of universe and the other one decay. We also discuss the possibility of
multiple attract... | [
{
"created": "Wed, 8 Nov 2017 10:11:53 GMT",
"version": "v1"
}
] | 2017-11-09 | [
[
"Li",
"Yu",
""
]
] | In this paper, we discuss the dynamics of two- scalar-field cosmological models. Unlike in the situation of exponential potential, we find that there are late-time attractors in which one scalar field dominates the energy density of universe and the other one decay. We also discuss the possibility of multiple attractor... |
1503.00098 | Salvatore Capozziello | Mariacristina Paolella and Salvatore Capozziello | Hojman Symmetry Approach for Scalar-Tensor Cosmology | 6 pages, 4 figures, to appear in Phys. Lett. A | null | 10.1016/j.physleta.2015.02.044 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar-tensor Cosmologies can be dealt under the standard of the Hojman
conservation theorem that allows to fix the form of the coupling $F(\phi)$, of
the potential $V(\phi)$ and to find out exact solutions for related
cosmological models. Specifically, the existence of a symmetry transformation
vector for the equati... | [
{
"created": "Sat, 28 Feb 2015 08:38:40 GMT",
"version": "v1"
}
] | 2015-06-24 | [
[
"Paolella",
"Mariacristina",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | Scalar-tensor Cosmologies can be dealt under the standard of the Hojman conservation theorem that allows to fix the form of the coupling $F(\phi)$, of the potential $V(\phi)$ and to find out exact solutions for related cosmological models. Specifically, the existence of a symmetry transformation vector for the equation... |
2207.12034 | Songbai Chen | Xin Qin, Songbai Chen, Zelin Zhang, Jiliang Jing | Polarized image of a rotating black hole in Scalar-Tensor-Vector-Gravity
theory | 20 pages, 13 figures, Accepted for publication in Astrophys. J | The Astrophysical Journal, 938:2, 2022 | 10.3847/1538-4357/ac8f49 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The polarized images of a synchrotron emitting ring are studied in the
spacetime of a rotating black hole in the Scalar-Tensor-Vector-Gravity (STVG)
theory. The black hole owns an additional dimensionless MOG parameter described
its deviation from Kerr black hole. The effects of the MOG parameter on the
observed pola... | [
{
"created": "Mon, 25 Jul 2022 10:17:21 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Sep 2022 01:36:34 GMT",
"version": "v2"
}
] | 2022-10-26 | [
[
"Qin",
"Xin",
""
],
[
"Chen",
"Songbai",
""
],
[
"Zhang",
"Zelin",
""
],
[
"Jing",
"Jiliang",
""
]
] | The polarized images of a synchrotron emitting ring are studied in the spacetime of a rotating black hole in the Scalar-Tensor-Vector-Gravity (STVG) theory. The black hole owns an additional dimensionless MOG parameter described its deviation from Kerr black hole. The effects of the MOG parameter on the observed polari... |
gr-qc/9712079 | Stephen M. Merkowitz | Stephen M. Merkowitz | Solution to the inverse problem for a noisy spherical gravitational wave
antenna | 12 pages, 3 figures, to appear in Phys. Rev. D | Phys.Rev.D58:062002,1998 | 10.1103/PhysRevD.58.062002 | null | gr-qc | null | A spherical gravitational wave antenna is distinct from other types of
gravitational wave antennas in that only a single detector is necessary to
determine the direction and polarization of a gravitational wave. Zhou and
Michelson showed that the inverse problem can be solved using the maximum
likelihood method if th... | [
{
"created": "Thu, 18 Dec 1997 12:49:02 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jul 1998 15:50:59 GMT",
"version": "v2"
}
] | 2009-12-30 | [
[
"Merkowitz",
"Stephen M.",
""
]
] | A spherical gravitational wave antenna is distinct from other types of gravitational wave antennas in that only a single detector is necessary to determine the direction and polarization of a gravitational wave. Zhou and Michelson showed that the inverse problem can be solved using the maximum likelihood method if the ... |
gr-qc/9309005 | Fonarev Oleg | Oleg A. Fonarev | Wigner function and quantum kinetic theory in curved space-time and
external fields | 41 pages | J.Math.Phys.35:2105-2129,1994 | 10.1063/1.530542 | null | gr-qc | null | A new definition of the Wigner function for quantum fields coupled to curved
space--time and an external Yang--Mills field is studied on the example of a
scalar and a Dirac fields. The definition uses the formalism of the tangent
bundles and is explicitly covariant and gauge invariant. Derivation of
collisionless qua... | [
{
"created": "Thu, 2 Sep 1993 14:54:28 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Fonarev",
"Oleg A.",
""
]
] | A new definition of the Wigner function for quantum fields coupled to curved space--time and an external Yang--Mills field is studied on the example of a scalar and a Dirac fields. The definition uses the formalism of the tangent bundles and is explicitly covariant and gauge invariant. Derivation of collisionless quant... |
0808.1042 | Vladimir Khatsymovsky | V.M. Khatsymovsky | Defining some integrals in Regge calculus | 7 pages | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Regge calculus minisuperspace action in the connection representation has the
form in which each term is linear over some field variable (scale of area-type
variable with sign). We are interested in the result of performing integration
over connections in the path integral. To find this function, we compute its
momen... | [
{
"created": "Thu, 7 Aug 2008 15:09:49 GMT",
"version": "v1"
}
] | 2008-10-09 | [
[
"Khatsymovsky",
"V. M.",
""
]
] | Regge calculus minisuperspace action in the connection representation has the form in which each term is linear over some field variable (scale of area-type variable with sign). We are interested in the result of performing integration over connections in the path integral. To find this function, we compute its moments... |
0802.0330 | Stefano Ansoldi | Stefano Ansoldi | Spherical black holes with regular center: a review of existing models
including a recent realization with Gaussian sources | LaTeX, 36 pages, 10 figures. To appear in the proceedings of "BH2,
Dynamics and Thermodynamics of Blackholes and Naked Singularities", May 10-12
2007, Milano, Italy (conference website: http://www.mate.polimi.it/bh2) | null | null | KUNS-2108 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review, in a historical perspective, some results about black hole
spacetimes with a regular center. We then see how their properties are realized
in a specific solution that recently appeared; in particular we analyze in
detail the (necessary) violation of the strong energy condition.
| [
{
"created": "Mon, 4 Feb 2008 03:13:00 GMT",
"version": "v1"
}
] | 2008-02-05 | [
[
"Ansoldi",
"Stefano",
""
]
] | We review, in a historical perspective, some results about black hole spacetimes with a regular center. We then see how their properties are realized in a specific solution that recently appeared; in particular we analyze in detail the (necessary) violation of the strong energy condition. |
2110.02536 | Rui-Yun Guo | Rui-Yun Guo, Lu Feng, Tian-Ying Yao, and Xing-Yu Chen | Exploration of interacting dynamical dark energy model with interaction
term including the equation-of-state parameter: alleviation of the $H_{0}$
tension | 14 pages, 4 figures | JCAP12(2021)036 | 10.1088/1475-7516/2021/12/036 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore a scenario of interacting dynamical dark energy model with the
interaction term $Q$ including the varying equation-of-state parameter $w$.
Using the data combination of the cosmic microwave background, the baryon
acoustic oscillation, and the type Ia supernovae, to global fit the interacting
dynamical dark... | [
{
"created": "Wed, 6 Oct 2021 06:58:58 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Nov 2021 06:40:09 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Dec 2021 06:24:24 GMT",
"version": "v3"
}
] | 2021-12-21 | [
[
"Guo",
"Rui-Yun",
""
],
[
"Feng",
"Lu",
""
],
[
"Yao",
"Tian-Ying",
""
],
[
"Chen",
"Xing-Yu",
""
]
] | We explore a scenario of interacting dynamical dark energy model with the interaction term $Q$ including the varying equation-of-state parameter $w$. Using the data combination of the cosmic microwave background, the baryon acoustic oscillation, and the type Ia supernovae, to global fit the interacting dynamical dark e... |
1303.7062 | Boris E. Meierovich | Boris E. Meierovich | Galaxy rotation curves. The theory | 17 pages, 13 figures | Physical Review D 87, D 87, 103510 (2013) | 10.1103/PhysRevD.87.103510 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The non-gauge vector field with as simple as possible Lagrangian
(\ref{Lagrangian}) turned out an adequate tool for macroscopic description of
the main properties of dark matter. The dependence of the velocity of a star on
the radius of the orbit $V\left(r\right) $ -- galaxy rotation curve -- is
derived analytically ... | [
{
"created": "Thu, 28 Mar 2013 08:13:51 GMT",
"version": "v1"
}
] | 2016-05-24 | [
[
"Meierovich",
"Boris E.",
""
]
] | The non-gauge vector field with as simple as possible Lagrangian (\ref{Lagrangian}) turned out an adequate tool for macroscopic description of the main properties of dark matter. The dependence of the velocity of a star on the radius of the orbit $V\left(r\right) $ -- galaxy rotation curve -- is derived analytically fr... |
1212.1477 | Sam Dolan Dr | Sam R. Dolan | Superradiant instabilities of rotating black holes in the time domain | 17 pages, 13 figures, to match journal version | Phys. Rev. D 87, 124026 (2013) | 10.1103/PhysRevD.87.124026 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bosonic fields on rotating black hole spacetimes are subject to amplification
by superradiance, which induces exponentially-growing instabilities (the `black
hole bomb') in two scenarios: if the black hole is enclosed by a mirror, or if
the bosonic field has rest mass. Here we present a time-domain study of the
scala... | [
{
"created": "Thu, 6 Dec 2012 21:28:06 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jul 2013 11:16:16 GMT",
"version": "v2"
}
] | 2013-07-02 | [
[
"Dolan",
"Sam R.",
""
]
] | Bosonic fields on rotating black hole spacetimes are subject to amplification by superradiance, which induces exponentially-growing instabilities (the `black hole bomb') in two scenarios: if the black hole is enclosed by a mirror, or if the bosonic field has rest mass. Here we present a time-domain study of the scalar ... |
0912.2397 | Chen Songbai | Songbai Chen, Liancheng Wang, Chikun Ding, Jiliang Jing | Holographic superconductors in the AdS black hole spacetime with a
global monopole | 12 pages, 4 figures, references added and corrected, accepted for
publication in NPB | Nucl.Phys. B836:222-231,2010 | 10.1016/j.nuclphysb.2010.04.025 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study holographic superconductors in the Schwarzschild-AdS black hole with
a global monopole through a charged complex scalar field. We calculate the
condensates of the charged operators in the dual conformal field theories
(CFTs) and discuss the effects of the global monopole on the condensation
formation. Moreov... | [
{
"created": "Sat, 12 Dec 2009 05:57:46 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Dec 2009 09:29:02 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Apr 2010 00:32:59 GMT",
"version": "v3"
},
{
"created": "Tue, 8 Jun 2010 03:54:47 GMT",
"version": "v4"
}
] | 2014-11-20 | [
[
"Chen",
"Songbai",
""
],
[
"Wang",
"Liancheng",
""
],
[
"Ding",
"Chikun",
""
],
[
"Jing",
"Jiliang",
""
]
] | We study holographic superconductors in the Schwarzschild-AdS black hole with a global monopole through a charged complex scalar field. We calculate the condensates of the charged operators in the dual conformal field theories (CFTs) and discuss the effects of the global monopole on the condensation formation. Moreover... |
gr-qc/0208038 | John Eastmond | John F.G. Eastmond | The Doomsday Argument, Consciousness and Many Worlds | LaTeX2e, 30 pages | null | null | null | gr-qc | null | The doomsday argument is a probabilistic argument that claims to predict the
total lifetime of the human race. By examining the case of an individual
lifetime, I conclude that the argument is fundamentally related to
consciousness. I derive a reformulation stating that an infinite conscious
lifetime is not possible e... | [
{
"created": "Thu, 15 Aug 2002 16:13:06 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Aug 2002 08:58:45 GMT",
"version": "v2"
},
{
"created": "Sat, 5 Oct 2002 09:29:47 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Eastmond",
"John F. G.",
""
]
] | The doomsday argument is a probabilistic argument that claims to predict the total lifetime of the human race. By examining the case of an individual lifetime, I conclude that the argument is fundamentally related to consciousness. I derive a reformulation stating that an infinite conscious lifetime is not possible eve... |
gr-qc/0406027 | Hossein Shojaie | Hossein Shojaie, Mehrdad Farhoudi | A varying-c cosmology | 11 pages | Can.J.Phys.85:1395-1408,2007 | 10.1139/P07-132 | null | gr-qc astro-ph | null | We develop a new model for the Universe based on two key assumptions: first,
the inertial energy of the Universe is a constant, and second, the total energy
of a particle, the inertial plus the gravitational potential energy produced by
the other mass in the Universe, is zero. This model allows the speed of light
and... | [
{
"created": "Tue, 8 Jun 2004 03:15:00 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Oct 2004 10:10:57 GMT",
"version": "v2"
},
{
"created": "Sat, 22 Dec 2007 10:52:23 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Shojaie",
"Hossein",
""
],
[
"Farhoudi",
"Mehrdad",
""
]
] | We develop a new model for the Universe based on two key assumptions: first, the inertial energy of the Universe is a constant, and second, the total energy of a particle, the inertial plus the gravitational potential energy produced by the other mass in the Universe, is zero. This model allows the speed of light and t... |
2406.05544 | Fernando Carneiro | F. L. Carneiro, B. C. C. Carneiro, D. L. Azevedo and S. C. Ulhoa | On Nanocones as a Gravitational Analog System | 13 pages, 6 figures. Comments are welcome | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This study delves into the fundamental properties of graphene and boron
nitride (BN) nanostructures, exploring their torsional energy characteristics
within the framework of Teleparallel Equivalent of General Relativity (TEGR).
By constructing nanocones with disclination defects in these materials, we
investigate the... | [
{
"created": "Sat, 8 Jun 2024 18:20:21 GMT",
"version": "v1"
}
] | 2024-06-11 | [
[
"Carneiro",
"F. L.",
""
],
[
"Carneiro",
"B. C. C.",
""
],
[
"Azevedo",
"D. L.",
""
],
[
"Ulhoa",
"S. C.",
""
]
] | This study delves into the fundamental properties of graphene and boron nitride (BN) nanostructures, exploring their torsional energy characteristics within the framework of Teleparallel Equivalent of General Relativity (TEGR). By constructing nanocones with disclination defects in these materials, we investigate the l... |
1910.12344 | Jaroslaw Jaracz | Jaroslaw Jaracz | The Penrose inequality and positive mass theorem with charge for
manifolds with asymptotically cylindrical ends | null | null | 10.1007/s00023-020-00927-z | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish the charged Penrose inequality for time symmetric initial data
sets having an outermost minimal surface boundary and finitely many
asymptotically cylindrical ends, with an appropriate rigidity statement. This
is accomplished by a doubling argument based on the work of Weinstein and
Yamada, and a subseque... | [
{
"created": "Sun, 27 Oct 2019 20:35:51 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Jan 2020 16:12:04 GMT",
"version": "v2"
}
] | 2020-08-26 | [
[
"Jaracz",
"Jaroslaw",
""
]
] | We establish the charged Penrose inequality for time symmetric initial data sets having an outermost minimal surface boundary and finitely many asymptotically cylindrical ends, with an appropriate rigidity statement. This is accomplished by a doubling argument based on the work of Weinstein and Yamada, and a subsequent... |
gr-qc/0001090 | Takahiro Tanaka | Takahiro Tanaka and Hideyuki Tagoshi | The use of new coordinates for the template space in hierarchical search
for gravitational waves from inspiraling binaries | 8 pages, 4 figures | Phys.Rev.D62:082001,2000 | 10.1103/PhysRevD.62.082001 | OU-TAP 114; UAB-FT 484 | gr-qc | null | We discuss a method to analyze data from interferometric gravitational wave
detectors focusing on the technique of hierarchical search to detect
gravitational waves from inspiraling binaries. For this purpose, we propose new
coordinates to parameterize the template space. Using our new coordinates, we
develop several... | [
{
"created": "Thu, 27 Jan 2000 14:19:46 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Tanaka",
"Takahiro",
""
],
[
"Tagoshi",
"Hideyuki",
""
]
] | We discuss a method to analyze data from interferometric gravitational wave detectors focusing on the technique of hierarchical search to detect gravitational waves from inspiraling binaries. For this purpose, we propose new coordinates to parameterize the template space. Using our new coordinates, we develop several n... |
gr-qc/9702006 | Ruth M. Williams | Ruth M. Williams | Recent Progress in Regge Calculus | 9 pages, no figures, LaTeX. Submitted to the Proceedings of the
Second Meeting on Constrained Dynamics and Quantum Gravity, Santa Margherita
Ligure, Italy, September 1996 | Nucl.Phys.Proc.Suppl. 57 (1997) 73-81 | 10.1016/S0920-5632(97)00355-1 | DAMTP/97-5 | gr-qc | null | While there has been some advance in the use of Regge calculus as a tool in
numerical relativity, the main progress in Regge calculus recently has been in
quantum gravity. After a brief discussion of this progress, attention is
focussed on two particular, related aspects. Firstly, the possible definitions
of diffeomo... | [
{
"created": "Mon, 3 Feb 1997 12:46:05 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Williams",
"Ruth M.",
""
]
] | While there has been some advance in the use of Regge calculus as a tool in numerical relativity, the main progress in Regge calculus recently has been in quantum gravity. After a brief discussion of this progress, attention is focussed on two particular, related aspects. Firstly, the possible definitions of diffeomorp... |
2210.06081 | Dmitri Fursaev | Dmitri V. Fursaev | Black Hole Thermodynamics and Perturbative Quantum Gravity | Invited chapter for the Section "Perturbative Quantum Gravity" of the
"Handbook of Quantum Gravity" (Eds. C. Bambi, L. Modesto and I.L. Shapiro,
Springer Singapore, expected in 2023), 36 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An introduction to generalized thermodynamics of quantum black holes, in the
one-loop approximation, is given. The material is aimed at graduate students.
The topics include: quantum evaporation of black holes, Euclidean formulation
of quantum theory on black hole backgrounds, the Hartle-Hawking-Israel state,
general... | [
{
"created": "Wed, 12 Oct 2022 10:53:28 GMT",
"version": "v1"
}
] | 2022-10-13 | [
[
"Fursaev",
"Dmitri V.",
""
]
] | An introduction to generalized thermodynamics of quantum black holes, in the one-loop approximation, is given. The material is aimed at graduate students. The topics include: quantum evaporation of black holes, Euclidean formulation of quantum theory on black hole backgrounds, the Hartle-Hawking-Israel state, generaliz... |
1412.6000 | Andrea Dapor | Mehdi Assanioussi, Andrea Dapor, Jerzy Lewandowski | Rainbow metric from quantum gravity | 4 pages, 2 figures. Accepted version in PLB | null | 10.1016/j.physletb.2015.10.043 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter, we describe a general mechanism for emergence of a rainbow
metric from a quantum cosmological model. This idea is based on QFT on a
quantum space-time. Under general assumptions, we discover that the quantum
space-time on which the field propagates can be replaced by a classical
space-time, whose metr... | [
{
"created": "Thu, 18 Dec 2014 18:56:13 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Dec 2014 19:40:46 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Oct 2015 12:05:13 GMT",
"version": "v3"
}
] | 2015-10-29 | [
[
"Assanioussi",
"Mehdi",
""
],
[
"Dapor",
"Andrea",
""
],
[
"Lewandowski",
"Jerzy",
""
]
] | In this letter, we describe a general mechanism for emergence of a rainbow metric from a quantum cosmological model. This idea is based on QFT on a quantum space-time. Under general assumptions, we discover that the quantum space-time on which the field propagates can be replaced by a classical space-time, whose metric... |
2201.13334 | Lisa Valerie Drummond | Lisa V. Drummond and Scott A. Hughes | Precisely computing bound orbits of spinning bodies around black holes
I: General framework and results for nearly equatorial orbits | 38 pages, 5 figures, submitted to Physical Review D; corrected typo
in Equation (C6) | null | 10.1103/PhysRevD.105.124040 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Very large mass ratio binary black hole systems are of interest both as a
clean limit of the two-body problem in general relativity, as well as for their
importance as sources of low-frequency gravitational waves. At lowest order,
the smaller body moves along a geodesic of the larger black hole's spacetime.
Post-geod... | [
{
"created": "Mon, 31 Jan 2022 16:30:56 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Mar 2022 17:40:16 GMT",
"version": "v2"
}
] | 2022-07-13 | [
[
"Drummond",
"Lisa V.",
""
],
[
"Hughes",
"Scott A.",
""
]
] | Very large mass ratio binary black hole systems are of interest both as a clean limit of the two-body problem in general relativity, as well as for their importance as sources of low-frequency gravitational waves. At lowest order, the smaller body moves along a geodesic of the larger black hole's spacetime. Post-geodes... |
gr-qc/9404011 | Lee Smolin | Lee Smolin | The fate of black hole singularities and the parameters of the standard
models of particle physics and cosmology | LaTeX, 27 p.CGPG-94/3-5 | null | null | null | gr-qc | null | A cosmological scenario which explains the values of the parameters of the
standard models of elementary particle physics and cosmology is discussed. In
this scenario these parameters are set by a process analogous to natural
selection which follows naturally from the assumption that the singularities in
black holes ... | [
{
"created": "Thu, 7 Apr 1994 23:59:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Smolin",
"Lee",
""
]
] | A cosmological scenario which explains the values of the parameters of the standard models of elementary particle physics and cosmology is discussed. In this scenario these parameters are set by a process analogous to natural selection which follows naturally from the assumption that the singularities in black holes ar... |
1706.01484 | Mariam Bouhmadi-Lopez | Imanol Albarran, Mariam Bouhmadi-L\'opez, Jo\~ao Morais | What if gravity becomes really repulsive in the future? | 7 pages, 3 figures. Further explanations provided. Version accepted
in EPJC | null | 10.1140/epjc/s10052-018-5728-x | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current acceleration of the Universe is one of the most puzzling issues
in theoretical physics nowadays. We are far from giving an answer on this
letter to its true nature. Yet, with the observations we have at hand, we
analyse the different patterns that the gravitational potential can show in the
future. Surpri... | [
{
"created": "Mon, 5 Jun 2017 18:18:00 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Jul 2017 18:36:04 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Mar 2018 17:20:17 GMT",
"version": "v3"
}
] | 2018-04-18 | [
[
"Albarran",
"Imanol",
""
],
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Morais",
"João",
""
]
] | The current acceleration of the Universe is one of the most puzzling issues in theoretical physics nowadays. We are far from giving an answer on this letter to its true nature. Yet, with the observations we have at hand, we analyse the different patterns that the gravitational potential can show in the future. Surprisi... |
1705.04602 | Anna Paula Bacalhau | Anna Paula Bacalhau, Patrick Peter and Sandro D. P. Vitenti | Anisotropic multiple bounce models | 11 pages, 9 figures, minor corrections | Phys. Rev. D 96, 023517 (2017) | 10.1103/PhysRevD.96.023517 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the Galileon ghost condensate implementation of a bouncing
cosmological model in the presence of a non negligible anisotropic stress. We
exhibit its structure, which we find to be far richer than previously thought.
In particular, even restricting attention to a single set of underlying
microscopic paramet... | [
{
"created": "Thu, 11 May 2017 14:48:17 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2017 15:12:05 GMT",
"version": "v2"
}
] | 2017-07-26 | [
[
"Bacalhau",
"Anna Paula",
""
],
[
"Peter",
"Patrick",
""
],
[
"Vitenti",
"Sandro D. P.",
""
]
] | We analyze the Galileon ghost condensate implementation of a bouncing cosmological model in the presence of a non negligible anisotropic stress. We exhibit its structure, which we find to be far richer than previously thought. In particular, even restricting attention to a single set of underlying microscopic parameter... |
2207.13114 | Yves Brihaye | Yves Brihaye, Carlos Herdeiro, Eugen Radu | $D=5$ static, charged black holes, strings and rings with resonant,
scalar $Q$-hair | 30 pages, 8 figures | null | 10.1007/JHEP10(2022)153 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A mechanism for circumventing the Mayo-Bekenstein no-hair theorem allows
endowing four dimensional $(D=4)$ asymptotically flat, spherical,
electro-vacuum black holes with a minimally coupled $U(1)$-gauged scalar field
profile: $Q$-$hair$. The scalar field must be massive, self-interacting and
obey a {\it resonance co... | [
{
"created": "Tue, 26 Jul 2022 18:05:19 GMT",
"version": "v1"
}
] | 2022-11-09 | [
[
"Brihaye",
"Yves",
""
],
[
"Herdeiro",
"Carlos",
""
],
[
"Radu",
"Eugen",
""
]
] | A mechanism for circumventing the Mayo-Bekenstein no-hair theorem allows endowing four dimensional $(D=4)$ asymptotically flat, spherical, electro-vacuum black holes with a minimally coupled $U(1)$-gauged scalar field profile: $Q$-$hair$. The scalar field must be massive, self-interacting and obey a {\it resonance cond... |
2310.20523 | Sen Guo | Sen Guo, Yu-Xiang Huang, Yu-Hao Cui, Yan Han, Qing-Quan Jiang, En-Wei
Liang, Kai Lin | Unveiling the unconventional optical signatures of regular black holes
within accretion disk | 27 pages, 10 figures | Published European Physical Journal C (2023) | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The optical characteristics of three types of black holes (BHs) surrounded by
a thin accretion disk are discussed, namely the Schwarzschild BH, Bardeen BH,
and Hayward BH. We calculate the deflection angle of light as it traverses the
vicinity of each BH using numerical integration and semi-analytical methods,
reveal... | [
{
"created": "Tue, 31 Oct 2023 15:03:10 GMT",
"version": "v1"
}
] | 2023-11-02 | [
[
"Guo",
"Sen",
""
],
[
"Huang",
"Yu-Xiang",
""
],
[
"Cui",
"Yu-Hao",
""
],
[
"Han",
"Yan",
""
],
[
"Jiang",
"Qing-Quan",
""
],
[
"Liang",
"En-Wei",
""
],
[
"Lin",
"Kai",
""
]
] | The optical characteristics of three types of black holes (BHs) surrounded by a thin accretion disk are discussed, namely the Schwarzschild BH, Bardeen BH, and Hayward BH. We calculate the deflection angle of light as it traverses the vicinity of each BH using numerical integration and semi-analytical methods, revealin... |
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