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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2109.02816 | Cosimo Bambi | Bakhtiyor Narzilloev, Sanjar Shaymatov, Ibrar Hussain, Ahmadjon
Abdujabbarov, Bobomurat Ahmedov, Cosimo Bambi | Motion of Particles and Gravitational Lensing Around (2+1)-dimensional
BTZ black holes in Gauss-Bonnet Gravity | 11 pages, 6 figures. Accepted for publication in EPJC | Eur. Phys. J. C (2021) 81:849 | 10.1140/epjc/s10052-021-09617-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study motion of test particles and photons in the vicinity of (2+1)
dimensional Gauss-Bonnet (GB) BTZ black hole. We find that the presence of the
coupling constant serves as an attractive gravitational charge, shifting the
innermost stable circular orbits outward with respect to the one for this
theory in 4 dimen... | [
{
"created": "Tue, 7 Sep 2021 02:02:38 GMT",
"version": "v1"
}
] | 2021-09-29 | [
[
"Narzilloev",
"Bakhtiyor",
""
],
[
"Shaymatov",
"Sanjar",
""
],
[
"Hussain",
"Ibrar",
""
],
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Ahmedov",
"Bobomurat",
""
],
[
"Bambi",
"Cosimo",
""
]
] | We study motion of test particles and photons in the vicinity of (2+1) dimensional Gauss-Bonnet (GB) BTZ black hole. We find that the presence of the coupling constant serves as an attractive gravitational charge, shifting the innermost stable circular orbits outward with respect to the one for this theory in 4 dimensi... |
gr-qc/9711015 | Steve Brandt | S. R. Brandt, and B. Bruegmann | BH Punctures as Initial Data for General Relativity | 3 pages, 2 postscript figures, LaTeX, uses mprocl.sty (available at
http://shemesh.fiz.huji.ac.il/MG8/submission.html) To appear in the
proceedings of the Marcel Grossmann 8 (Jerusalem, 1997) | null | null | EFI-94-11 | gr-qc | null | We construct initial data for several black holes with arbitrary momenta and
spins by a new method that is based on a compactification of Brill-Lindquist
wormholes. When treated numerically, the method leads to a significant
simplification over the conventional approach which is based on throats and an
isometry condi... | [
{
"created": "Wed, 5 Nov 1997 17:11:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brandt",
"S. R.",
""
],
[
"Bruegmann",
"B.",
""
]
] | We construct initial data for several black holes with arbitrary momenta and spins by a new method that is based on a compactification of Brill-Lindquist wormholes. When treated numerically, the method leads to a significant simplification over the conventional approach which is based on throats and an isometry conditi... |
1601.06436 | Torsten Asselmeyer-Maluga | Torsten Asselmeyer-Maluga | Smooth quantum gravity: Exotic smoothness and Quantum gravity | 52 pages, 11 figure, on the occasion of the 80-th birthday of Carl H.
Brans To appear in "At the Frontiers of Spacetime: Scalar-Tensor Theory,
Bell's Inequality, Mach's Principle, Exotic Smoothness" Springer 2016, in
honor of Carl Brans's 80th birthday. arXiv admin note: text overlap with
arXiv:q-alg/9710003, a... | null | null | null | gr-qc hep-th math-ph math.GT math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Over the last two decades, many unexpected relations between exotic
smoothness, e.g. exotic $\mathbb{R}^{4}$, and quantum field theory were found.
Some of these relations are rooted in a relation to superstring theory and
quantum gravity. Therefore one would expect that exotic smoothness is directly
related to the qu... | [
{
"created": "Sun, 24 Jan 2016 22:27:05 GMT",
"version": "v1"
}
] | 2016-01-27 | [
[
"Asselmeyer-Maluga",
"Torsten",
""
]
] | Over the last two decades, many unexpected relations between exotic smoothness, e.g. exotic $\mathbb{R}^{4}$, and quantum field theory were found. Some of these relations are rooted in a relation to superstring theory and quantum gravity. Therefore one would expect that exotic smoothness is directly related to the quan... |
2110.00799 | Recai Erdem | Recai Erdem, Bet\"ul Demirkaya, and Kemal G\"ultekin | Curved space and particle physics effects on the formation of
Bose-Einstein condensation around a Reissner-Nordstr\"om black hole | The submitted version of the paper. The revised form of the paper is
published in European Physical Journal Plus 136 (2021) 972 | null | null | null | gr-qc hep-ph hep-th | http://creativecommons.org/licenses/by-sa/4.0/ | We consider two scalar fields interacting through a $\chi^*\chi\phi^*\phi$
term in the presence of a Reissner-Nordstrom black hole. Initially, only $\chi$
particles are present. We find that the produced $\phi$ particles are localized
in a region around the black hole and have a tendency towards condensation
provided... | [
{
"created": "Sat, 2 Oct 2021 13:26:20 GMT",
"version": "v1"
}
] | 2021-10-05 | [
[
"Erdem",
"Recai",
""
],
[
"Demirkaya",
"Betül",
""
],
[
"Gültekin",
"Kemal",
""
]
] | We consider two scalar fields interacting through a $\chi^*\chi\phi^*\phi$ term in the presence of a Reissner-Nordstrom black hole. Initially, only $\chi$ particles are present. We find that the produced $\phi$ particles are localized in a region around the black hole and have a tendency towards condensation provided t... |
gr-qc/0409076 | Emilio Elizalde | Emilio Elizalde | Cosmology: Techniques and Observations | 64 pages, 12 figures, lectures | null | null | null | gr-qc astro-ph hep-th | null | These lectures were addressed to nonspecialists willing to learn some basic
facts, approaches, tools and observational evidence which conform modern
cosmology. The aim is also to try to complement the many excellent treatises
that exists on the subject (an exhaustive treatment being in any case
impossible for lack of... | [
{
"created": "Mon, 20 Sep 2004 16:27:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Elizalde",
"Emilio",
""
]
] | These lectures were addressed to nonspecialists willing to learn some basic facts, approaches, tools and observational evidence which conform modern cosmology. The aim is also to try to complement the many excellent treatises that exists on the subject (an exhaustive treatment being in any case impossible for lack of t... |
2209.12865 | Marco Antonelli | Lorenzo Gavassino, Marco Antonelli | Relativistic Liquids: GENERIC or EIT? | 16 pages, no figures. Published in CQG,
https://doi.org/10.1088/1361-6382/acc165 | Class. Quantum Grav. 40 (2023) 075012 (22pp) | 10.1088/1361-6382/acc165 | null | gr-qc astro-ph.HE physics.flu-dyn | http://creativecommons.org/licenses/by/4.0/ | We study the GENERIC hydrodynamic theory for relativistic liquids formulated
by Ottinger and collaborators. We use the maximum entropy principle to derive
its conditions for linear stability (in an arbitrary reference frame) and for
relativistic causality. In addition, we show that, in the linear regime, its
field eq... | [
{
"created": "Mon, 26 Sep 2022 17:31:56 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Mar 2023 13:46:40 GMT",
"version": "v2"
}
] | 2023-03-16 | [
[
"Gavassino",
"Lorenzo",
""
],
[
"Antonelli",
"Marco",
""
]
] | We study the GENERIC hydrodynamic theory for relativistic liquids formulated by Ottinger and collaborators. We use the maximum entropy principle to derive its conditions for linear stability (in an arbitrary reference frame) and for relativistic causality. In addition, we show that, in the linear regime, its field equa... |
2203.00901 | Sobhan Kazempour | Amin Rezaei Akbarieh, Sobhan Kazempour, and Lijing Shao | Cosmology and perturbations in tachyonic massive gravity | null | Phys. Rev. D 105, 023501 (2022) | 10.1103/PhysRevD.105.023501 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | As massive gravity and its extensions offer physically well-defined
gravitational theories with a nonzero graviton mass, we present a new extension
of the de Rham-Gabadadze-Tolley (dRGT)massive gravity, which is tachyonic
massive gravity theory. We firstly introduce the new extension of the dRGT
massive gravity, cons... | [
{
"created": "Wed, 2 Mar 2022 07:14:37 GMT",
"version": "v1"
}
] | 2022-03-03 | [
[
"Akbarieh",
"Amin Rezaei",
""
],
[
"Kazempour",
"Sobhan",
""
],
[
"Shao",
"Lijing",
""
]
] | As massive gravity and its extensions offer physically well-defined gravitational theories with a nonzero graviton mass, we present a new extension of the de Rham-Gabadadze-Tolley (dRGT)massive gravity, which is tachyonic massive gravity theory. We firstly introduce the new extension of the dRGT massive gravity, constr... |
2103.11416 | Ming Zhang | Ming Zhang and Jie Jiang | NUT charges and black hole shadows | 7 pages | null | 10.1016/j.physletb.2021.136213 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the nontrivial effects of the NUT charges on the shadows of the
Kerr-Taub-NUT black holes seen by zero-angular-momentum-observers. Inclination
angles with which the observers gain maximal, locally extreme or minimal shadow
sizes and distortions are investigated for the black holes with different NUT
charges ... | [
{
"created": "Sun, 21 Mar 2021 15:03:15 GMT",
"version": "v1"
}
] | 2021-04-07 | [
[
"Zhang",
"Ming",
""
],
[
"Jiang",
"Jie",
""
]
] | We study the nontrivial effects of the NUT charges on the shadows of the Kerr-Taub-NUT black holes seen by zero-angular-momentum-observers. Inclination angles with which the observers gain maximal, locally extreme or minimal shadow sizes and distortions are investigated for the black holes with different NUT charges an... |
1007.1861 | Angelo Tartaglia | A. Di Virgilio, K. U. Schreiber, A. Gebauer, J-P. R. Wells, A.
Tartaglia, J. Belfi, N. Beverini, A.Ortolan | A laser gyroscope system to detect the Gravito-Magnetic effect on Earth | 9 pages, 6 figures. 2010 Honourable mention of the Gravity Research
Foundation; to be published on J. Mod. Phys. D | Int.J.Mod.Phys.D19:2331-2343,2010 | 10.1142/S0218271810018360 | null | gr-qc physics.geo-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Large scale square ring laser gyros with a length of four meters on each side
are approaching a sensitivity of 1x10^-11 rad/s/sqrt(Hz). This is about the
regime required to measure the gravitomagnetic effect (Lense Thirring) of the
Earth. For an ensemble of linearly independent gyros each measurement signal
depends u... | [
{
"created": "Mon, 12 Jul 2010 10:36:15 GMT",
"version": "v1"
}
] | 2011-01-17 | [
[
"Di Virgilio",
"A.",
""
],
[
"Schreiber",
"K. U.",
""
],
[
"Gebauer",
"A.",
""
],
[
"Wells",
"J-P. R.",
""
],
[
"Tartaglia",
"A.",
""
],
[
"Belfi",
"J.",
""
],
[
"Beverini",
"N.",
""
],
[
"Ortolan",... | Large scale square ring laser gyros with a length of four meters on each side are approaching a sensitivity of 1x10^-11 rad/s/sqrt(Hz). This is about the regime required to measure the gravitomagnetic effect (Lense Thirring) of the Earth. For an ensemble of linearly independent gyros each measurement signal depends upo... |
1109.5602 | Sergio Dain | Sergio Dain and Jos\'e Luis Jaramillo and Mart\'in Reiris | Area-charge inequality for black holes | 21 pages, 2 figures | null | 10.1088/0264-9381/29/3/035013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inequality between area and charge $A\geq 4\pi Q^2$ for dynamical black
holes is proved. No symmetry assumption is made and charged matter fields are
included. Extensions of this inequality are also proved for regions in the
spacetime which are not necessarily black hole boundaries.
| [
{
"created": "Mon, 26 Sep 2011 15:30:26 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Dain",
"Sergio",
""
],
[
"Jaramillo",
"José Luis",
""
],
[
"Reiris",
"Martín",
""
]
] | The inequality between area and charge $A\geq 4\pi Q^2$ for dynamical black holes is proved. No symmetry assumption is made and charged matter fields are included. Extensions of this inequality are also proved for regions in the spacetime which are not necessarily black hole boundaries. |
1408.1235 | Sergey Sushkov | R.V. Korolev and Sergey V. Sushkov | Exact wormhole solutions with nonminimal kinetic coupling | 7 pages, 3 figures, to be submitted to PRD | null | 10.1103/PhysRevD.90.124025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider static spherically symmetric solutions in the scalar-tensor
theory of gravity with a scalar field possessing the nonminimal kinetic
coupling to the curvature. The lagrangian of the theory contains the term
$(\varepsilon g^{\mu\nu}+\eta G^{\mu \nu})\phi_{,\mu}\phi_{,\nu}$ and
represents a particular case o... | [
{
"created": "Wed, 6 Aug 2014 10:20:04 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Korolev",
"R. V.",
""
],
[
"Sushkov",
"Sergey V.",
""
]
] | We consider static spherically symmetric solutions in the scalar-tensor theory of gravity with a scalar field possessing the nonminimal kinetic coupling to the curvature. The lagrangian of the theory contains the term $(\varepsilon g^{\mu\nu}+\eta G^{\mu \nu})\phi_{,\mu}\phi_{,\nu}$ and represents a particular case of ... |
2302.06627 | Nils Siemonsen | Nils Siemonsen, William E. East | Binary boson stars: Merger dynamics and formation of rotating remnant
stars | 29 pages, 20 figures; updated to match PRD version | Phys. Rev. D 107, 124018 (2023) | 10.1103/PhysRevD.107.124018 | null | gr-qc astro-ph.HE hep-ph | http://creativecommons.org/licenses/by/4.0/ | Scalar boson stars have attracted attention as simple models for exploring
the nonlinear dynamics of a large class of ultra compact and black hole
mimicking objects. Here, we study the impact of interactions in the scalar
matter making up these stars. In particular, we show the pivotal role the
scalar phase and vorte... | [
{
"created": "Mon, 13 Feb 2023 19:00:01 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jun 2023 14:37:54 GMT",
"version": "v2"
}
] | 2023-06-14 | [
[
"Siemonsen",
"Nils",
""
],
[
"East",
"William E.",
""
]
] | Scalar boson stars have attracted attention as simple models for exploring the nonlinear dynamics of a large class of ultra compact and black hole mimicking objects. Here, we study the impact of interactions in the scalar matter making up these stars. In particular, we show the pivotal role the scalar phase and vortex ... |
0711.0117 | Kristina Giesel | K. Giesel, S. Hofmann, T. Thiemann, O. Winkler | Manifestly Gauge-Invariant General Relativistic Perturbation Theory: II.
FRW Background and First Order | 51 pages, no figures | Class.Quant.Grav.27:055006,2010 | 10.1088/0264-9381/27/5/055006 | AEI-2007-151 | gr-qc astro-ph hep-th | null | In our companion paper we identified a complete set of manifestly
gauge-invariant observables for general relativity. This was possible by
coupling the system of gravity and matter to pressureless dust which plays the
role of a dynamically coupled observer. The evolution of those observables is
governed by a physical... | [
{
"created": "Thu, 1 Nov 2007 18:05:49 GMT",
"version": "v1"
}
] | 2010-02-17 | [
[
"Giesel",
"K.",
""
],
[
"Hofmann",
"S.",
""
],
[
"Thiemann",
"T.",
""
],
[
"Winkler",
"O.",
""
]
] | In our companion paper we identified a complete set of manifestly gauge-invariant observables for general relativity. This was possible by coupling the system of gravity and matter to pressureless dust which plays the role of a dynamically coupled observer. The evolution of those observables is governed by a physical H... |
gr-qc/0003046 | Arthur G. Wasserman | Arthur G. Wasserman | Solutions of the spherically symmetric SU(2) Einstein-Yang-Mills
equations defined in the far field | 15 pages | J.Math.Phys.41:6930-6936,2000 | 10.1063/1.1288796 | null | gr-qc | null | It is shown analytically that every static, spherically symmetric solution to
the Einstein Yang Mills equations with SU(2) gauge group that is defined in the
far field has finite ADM mass. Moreover, there can be at most two horizons for
such solutions. The three types of solutions possible, Bartnik-McKinnon
particle-... | [
{
"created": "Mon, 13 Mar 2000 20:04:38 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Wasserman",
"Arthur G.",
""
]
] | It is shown analytically that every static, spherically symmetric solution to the Einstein Yang Mills equations with SU(2) gauge group that is defined in the far field has finite ADM mass. Moreover, there can be at most two horizons for such solutions. The three types of solutions possible, Bartnik-McKinnon particle-li... |
2007.07974 | Surjeet Rajendran | Yi Chen, Muamer Kadic, David E. Kaplan, Surjeet Rajendran, Alexander
O. Sushkov and Martin Wegener | High-Frequency Gravitational-Wave Detection Using a Chiral Resonant
Mechanical Element and a Short Unstable Optical Cavity | 6 pages, 6 figures | null | null | null | gr-qc hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Present gravitational wave detectors are based on the measurement of linear
displacement in stable optical cavities. Here, we instead suggest the
measurement of the twist of a chiral mechanical element induced by a
gravitational wave. The induced twist rotates a flat optical mirror on top of
this chiral element, lead... | [
{
"created": "Wed, 15 Jul 2020 20:09:43 GMT",
"version": "v1"
}
] | 2020-07-17 | [
[
"Chen",
"Yi",
""
],
[
"Kadic",
"Muamer",
""
],
[
"Kaplan",
"David E.",
""
],
[
"Rajendran",
"Surjeet",
""
],
[
"Sushkov",
"Alexander O.",
""
],
[
"Wegener",
"Martin",
""
]
] | Present gravitational wave detectors are based on the measurement of linear displacement in stable optical cavities. Here, we instead suggest the measurement of the twist of a chiral mechanical element induced by a gravitational wave. The induced twist rotates a flat optical mirror on top of this chiral element, leadin... |
1703.09722 | Christopher Berry | Stanislav Babak, Jonathan Gair, Alberto Sesana, Enrico Barausse,
Carlos F. Sopuerta, Christopher P. L. Berry, Emanuele Berti, Pau
Amaro-Seoane, Antoine Petiteau, and Antoine Klein | Science with the space-based interferometer LISA. V: Extreme mass-ratio
inspirals | 13 figures, 22 pages; updated to match published version | Phys. Rev. D; 95(10):103012(21); 2017 | 10.1103/PhysRevD.95.103012 | null | gr-qc astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The space-based Laser Interferometer Space Antenna (LISA) will be able to
observe the gravitational-wave signals from systems comprised of a massive
black hole and a stellar-mass compact object. These systems are known as
extreme-mass-ratio inspirals (EMRIs) and are expected to complete $\sim
10^4$-$10^5$ cycles in b... | [
{
"created": "Tue, 28 Mar 2017 18:00:17 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Apr 2018 11:52:26 GMT",
"version": "v2"
}
] | 2018-04-12 | [
[
"Babak",
"Stanislav",
""
],
[
"Gair",
"Jonathan",
""
],
[
"Sesana",
"Alberto",
""
],
[
"Barausse",
"Enrico",
""
],
[
"Sopuerta",
"Carlos F.",
""
],
[
"Berry",
"Christopher P. L.",
""
],
[
"Berti",
"Emanuele",
... | The space-based Laser Interferometer Space Antenna (LISA) will be able to observe the gravitational-wave signals from systems comprised of a massive black hole and a stellar-mass compact object. These systems are known as extreme-mass-ratio inspirals (EMRIs) and are expected to complete $\sim 10^4$-$10^5$ cycles in ban... |
1602.06300 | Jaiyul Yoo | Jaiyul Yoo (Z\"urich), Jinn-Ouk Gong (APCTP, Pohang) | Exact Analytic Solution for Non-Linear Density Fluctuation in a LCDM
Universe | 20 pages, no figures, published in JCAP | JCAP 07 (2016) 017 | 10.1088/1475-7516/2016/07/017 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the exact third-order analytic solution of the matter density
fluctuation in the proper-time hypersurface in a $\Lambda$CDM universe,
accounting for the explicit time-dependence and clarifying the relation to the
initial condition. Furthermore, we compare our analytic solution to the
previous calculation in... | [
{
"created": "Fri, 19 Feb 2016 21:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jul 2016 14:27:09 GMT",
"version": "v2"
}
] | 2016-07-14 | [
[
"Yoo",
"Jaiyul",
"",
"Zürich"
],
[
"Gong",
"Jinn-Ouk",
"",
"APCTP, Pohang"
]
] | We derive the exact third-order analytic solution of the matter density fluctuation in the proper-time hypersurface in a $\Lambda$CDM universe, accounting for the explicit time-dependence and clarifying the relation to the initial condition. Furthermore, we compare our analytic solution to the previous calculation in t... |
2104.00596 | Mehdi Shokri | Mehdi Shokri, Jafar Sadeghi, Mohammad Reza Setare and Salvatore
Capozziello | Nonminimal coupling inflation with constant slow roll | 15 pages, 6 figures, Accepted for publication in Int. J. Mod. Phys. D | null | 10.1142/S021827182150070X | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We study a single field inflationary model modified by a non-minimal coupling
term between the Ricci scalar $R$ and the scalar field $\varphi$ in the context
of constant-roll inflation. The first-order formalism is used to analyse the
constant-roll inflation instead of the standard methods used in the literature.
In ... | [
{
"created": "Wed, 31 Mar 2021 13:07:31 GMT",
"version": "v1"
},
{
"created": "Thu, 6 May 2021 09:39:59 GMT",
"version": "v2"
},
{
"created": "Sun, 30 May 2021 14:25:48 GMT",
"version": "v3"
}
] | 2021-08-11 | [
[
"Shokri",
"Mehdi",
""
],
[
"Sadeghi",
"Jafar",
""
],
[
"Setare",
"Mohammad Reza",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | We study a single field inflationary model modified by a non-minimal coupling term between the Ricci scalar $R$ and the scalar field $\varphi$ in the context of constant-roll inflation. The first-order formalism is used to analyse the constant-roll inflation instead of the standard methods used in the literature. In pr... |
1810.04667 | Valerio Faraoni | Valerio Faraoni (Bishop's University) | Embedding black holes and other inhomogeneities in the universe in
various theories of gravity: a short review | Invited paper to appear in "Theories of gravity: alternatives to the
cosmological and particle standard models", special issue of Universe, S.
Bellucci and O. Luongo eds. arXiv admin note: text overlap with
arXiv:1309.4915 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classic black hole mechanics and thermodynamics are formulated for
stationary black holes with event horizons. Alternative theories of gravity of
interest for cosmology contain a built-in time-dependent cosmological
"constant" and black holes are not stationary. Realistic black holes are anyway
dynamical because ... | [
{
"created": "Tue, 9 Oct 2018 21:07:33 GMT",
"version": "v1"
}
] | 2018-10-12 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
]
] | The classic black hole mechanics and thermodynamics are formulated for stationary black holes with event horizons. Alternative theories of gravity of interest for cosmology contain a built-in time-dependent cosmological "constant" and black holes are not stationary. Realistic black holes are anyway dynamical because th... |
gr-qc/9907027 | Leonid Grishchuk | S V Babak and L P Grishchuk | The Energy-Momentum Tensor for the Gravitational Field | 32 pages, revised version, additional references, to be published in
Phys. Rev. D | Phys.Rev. D61 (2000) 024038 | 10.1103/PhysRevD.61.024038 | null | gr-qc astro-ph hep-th | null | The search for the gravitational energy-momentum tensor is often qualified as
an attempt of looking for ``the right answer to the wrong question''. This
position does not seem convincing to us. We think that we have found the right
answer to the properly formulated question. We have further developed the field
theore... | [
{
"created": "Wed, 7 Jul 1999 11:37:16 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Oct 1999 23:06:30 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Babak",
"S V",
""
],
[
"Grishchuk",
"L P",
""
]
] | The search for the gravitational energy-momentum tensor is often qualified as an attempt of looking for ``the right answer to the wrong question''. This position does not seem convincing to us. We think that we have found the right answer to the properly formulated question. We have further developed the field theoreti... |
1905.07633 | Yerko V\'asquez | P. A. Gonz\'alez, Samuel Reyes and Yerko V\'asquez | Teleparallel Equivalent of Lovelock Gravity, Generalizations and
Cosmological Applications | Version accepted for publication in JCAP | null | 10.1088/1475-7516/2019/07/040 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the teleparallel equivalent of Lovelock gravity and its natural
extension, where the action is given by an arbitrary function $f(T_{_{L_1}},
T_{_{L_2}},\cdot \cdot \cdot , T_{_{L_n}})$ of the torsion invariants
$T_{_{L_i}}$, which contain higher order torsion terms, and derive its field
equations. Then, w... | [
{
"created": "Sat, 18 May 2019 19:48:53 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Jun 2019 19:09:36 GMT",
"version": "v2"
},
{
"created": "Wed, 10 Jul 2019 16:26:34 GMT",
"version": "v3"
}
] | 2019-07-31 | [
[
"González",
"P. A.",
""
],
[
"Reyes",
"Samuel",
""
],
[
"Vásquez",
"Yerko",
""
]
] | We consider the teleparallel equivalent of Lovelock gravity and its natural extension, where the action is given by an arbitrary function $f(T_{_{L_1}}, T_{_{L_2}},\cdot \cdot \cdot , T_{_{L_n}})$ of the torsion invariants $T_{_{L_i}}$, which contain higher order torsion terms, and derive its field equations. Then, we ... |
1208.5562 | Mohammad Vahid Takook | M. Enayati, S. Rouhani, M.V. Takook | Quantum Linear Gravity in de Sitter Universe On Gupta-Bleuler vacuum
state | 19 pages, typos corrected, reference addeded, further comments add | Int J Theor Phys 55(2016)5005 | 10.1007/s10773-016-3249-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Application of Krein space quantization to the linear gravity in de Sitter
space-time have constructed on Gupta-Bleuler vacuum state, resulting in removal
of infrared divergence and preserving de Sitter covariant. By pursuing this
path, the non uniqueness of vacuum expectation value of the product of field
operators ... | [
{
"created": "Tue, 28 Aug 2012 06:08:03 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Aug 2014 08:42:29 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Jun 2016 05:54:45 GMT",
"version": "v3"
}
] | 2019-07-02 | [
[
"Enayati",
"M.",
""
],
[
"Rouhani",
"S.",
""
],
[
"Takook",
"M. V.",
""
]
] | Application of Krein space quantization to the linear gravity in de Sitter space-time have constructed on Gupta-Bleuler vacuum state, resulting in removal of infrared divergence and preserving de Sitter covariant. By pursuing this path, the non uniqueness of vacuum expectation value of the product of field operators in... |
1705.06711 | Matti Raasakka | Matti Raasakka | Local Lorentz covariance in finite-dimensional Local Quantum Physics | 7 pages; v3: Minor typos fixed, matches the published version. v2:
The definition of local Hamiltonians is slightly changed from the previous
version in order to better justify the physical identification of SL(2,C)
transformations with Lorentz transformations. The rest of the paper has been
modified to accommo... | Phys. Rev. D 96, 086023 (2017) | 10.1103/PhysRevD.96.086023 | null | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that local Lorentz covariance arises canonically as the group of
transformations between local thermal states in the framework of Local Quantum
Physics, given the following three postulates: (i) Local observable algebras
are finite-dimensional. (ii) Minimal local observable algebras are isomorphic
to $\mathbb... | [
{
"created": "Thu, 18 May 2017 17:28:48 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Sep 2017 10:02:31 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Dec 2017 13:39:10 GMT",
"version": "v3"
}
] | 2017-12-07 | [
[
"Raasakka",
"Matti",
""
]
] | We show that local Lorentz covariance arises canonically as the group of transformations between local thermal states in the framework of Local Quantum Physics, given the following three postulates: (i) Local observable algebras are finite-dimensional. (ii) Minimal local observable algebras are isomorphic to $\mathbb{M... |
1905.07352 | Ruben Cordero | R. Cordero (1), O. G. Miranda (2) and M. Serrano-Crivelli (1) ((1)
Mexico, ESFM, (2) CINVESTAV, IPN) | K-essence and kinetic gravity braiding models in two-field measure
theory | 21 pages, 1 figure | null | 10.1088/1475-7516/2019/07/027 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, in the context of the two-field measure theory, any k-essence
model leads to the existence of a fluid made of non-relativistic matter and
cosmological constant that would explain the dark matter and dark energy
problem at the same time. On the other hand, kinetic gravity braiding models
can lead to diff... | [
{
"created": "Fri, 17 May 2019 16:18:26 GMT",
"version": "v1"
}
] | 2019-07-24 | [
[
"Cordero",
"R.",
""
],
[
"Miranda",
"O. G.",
""
],
[
"Serrano-Crivelli",
"M.",
""
]
] | We show that, in the context of the two-field measure theory, any k-essence model leads to the existence of a fluid made of non-relativistic matter and cosmological constant that would explain the dark matter and dark energy problem at the same time. On the other hand, kinetic gravity braiding models can lead to differ... |
0710.2158 | Vladimir S. Manko | Vladimir S. Manko | The double-Reissner-Nordstrom solution and the interaction force between
two spherically symmetric charged particles | 14 pages, 1 figure; submitted to Physical Review D | Phys.Rev.D76:124032,2007 | 10.1103/PhysRevD.76.124032 | null | gr-qc | null | The physical representation of the general double-Reissner-Nordstrom solution
is obtained by rewriting the N=2 Breton-Manko-Aguilar electrostatic solution in
the Varzugin-Chistyakov parametrization (M_i, Q_i, R). A concise analytical
formula is derived for the interaction force between two arbitrary
Reissner-Nordstro... | [
{
"created": "Thu, 11 Oct 2007 03:33:15 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Manko",
"Vladimir S.",
""
]
] | The physical representation of the general double-Reissner-Nordstrom solution is obtained by rewriting the N=2 Breton-Manko-Aguilar electrostatic solution in the Varzugin-Chistyakov parametrization (M_i, Q_i, R). A concise analytical formula is derived for the interaction force between two arbitrary Reissner-Nordstrom ... |
2405.16986 | Tolga Birkandan | Emir Baysazan, Tolga Birkandan, Ismail Eyuphan Unver | Analysis of scalar fields with series convolution | 14 pages | null | null | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | Wave equations for some curved spacetimes may involve functions that prevent
a solution in a closed form. In some cases, these functions can be eliminated
by transformations and the solutions can be found analytically. In the cases
where such transformations are not available, the infinite series expansions of
these ... | [
{
"created": "Mon, 27 May 2024 09:31:25 GMT",
"version": "v1"
}
] | 2024-05-28 | [
[
"Baysazan",
"Emir",
""
],
[
"Birkandan",
"Tolga",
""
],
[
"Unver",
"Ismail Eyuphan",
""
]
] | Wave equations for some curved spacetimes may involve functions that prevent a solution in a closed form. In some cases, these functions can be eliminated by transformations and the solutions can be found analytically. In the cases where such transformations are not available, the infinite series expansions of these fu... |
0904.3779 | Federico Urban | Evan C. Thomas, Federico R. Urban, Ariel R. Zhitnitsky | The cosmological constant as a manifestation of the conformal anomaly? | 15 pages - v2 with extended introduction to match published version | JHEP 0908:043,2009 | 10.1088/1126-6708/2009/08/043 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose that the solution to the cosmological vacuum energy puzzle may
come from the infrared sector of the effective theory of gravity, where the
impact of the trace anomaly is of upmost relevance. We proceed by introducing
two auxiliary fields, which are capable of describing a diversity of quantum
states via sp... | [
{
"created": "Fri, 24 Apr 2009 02:05:41 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Aug 2009 17:12:46 GMT",
"version": "v2"
}
] | 2009-08-12 | [
[
"Thomas",
"Evan C.",
""
],
[
"Urban",
"Federico R.",
""
],
[
"Zhitnitsky",
"Ariel R.",
""
]
] | We propose that the solution to the cosmological vacuum energy puzzle may come from the infrared sector of the effective theory of gravity, where the impact of the trace anomaly is of upmost relevance. We proceed by introducing two auxiliary fields, which are capable of describing a diversity of quantum states via spec... |
2309.11383 | Soumya Jana | Md. Golam Mafuz, Rishank Diwan, Soumya Jana, Sayan Kar | Shadows of a generic class of spherically symmetric, static spacetimes | 32 pages, 11 figures, references added. Matched with published
version | Eur. Phys. J. Plus, 139:219 (2024) | 10.1140/epjp/s13360-024-04993-8 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We explore the characteristics of shadows for a general class of spherically
symmetric, static spacetimes, which may arise in general relativity or in
modified theories of gravity. The chosen line element involves a sum (with
constant but different coefficients) of integer powers of $\frac{1}{\text{r}}$
in $\text{g}_... | [
{
"created": "Wed, 20 Sep 2023 15:10:02 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Sep 2023 17:07:09 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Mar 2024 17:41:10 GMT",
"version": "v3"
}
] | 2024-03-19 | [
[
"Mafuz",
"Md. Golam",
""
],
[
"Diwan",
"Rishank",
""
],
[
"Jana",
"Soumya",
""
],
[
"Kar",
"Sayan",
""
]
] | We explore the characteristics of shadows for a general class of spherically symmetric, static spacetimes, which may arise in general relativity or in modified theories of gravity. The chosen line element involves a sum (with constant but different coefficients) of integer powers of $\frac{1}{\text{r}}$ in $\text{g}_\t... |
gr-qc/0301072 | Luisa T. Buchman | L. T. Buchman and J. M. Bardeen | A hyperbolic tetrad formulation of the Einstein equations for numerical
relativity | Eqs. (59), (B3), (B4), and (B5) have been corrected (multiplied by
-1). Two typos have been fixed, and citations have been removed from the
abstract | Phys.Rev.D67:084017,2003; Erratum-ibid.D72:049903,2005 | 10.1103/PhysRevD.67.084017 10.1103/PhysRevD.72.049903 | null | gr-qc | null | The tetrad-based equations for vacuum gravity published by Estabrook,
Robinson, and Wahlquist are simplified and adapted for numerical relativity. We
show that the evolution equations as partial differential equations for the
Ricci rotation coefficients constitute a rather simple first-order
symmetrizable hyperbolic ... | [
{
"created": "Tue, 21 Jan 2003 03:56:15 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2005 20:57:52 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Buchman",
"L. T.",
""
],
[
"Bardeen",
"J. M.",
""
]
] | The tetrad-based equations for vacuum gravity published by Estabrook, Robinson, and Wahlquist are simplified and adapted for numerical relativity. We show that the evolution equations as partial differential equations for the Ricci rotation coefficients constitute a rather simple first-order symmetrizable hyperbolic sy... |
1504.05178 | Maurice H. P. M. van Putten | Maurice H.P.M. van Putten | Accelerated expansion from cosmological holography | 5 pages, 2 figures | MNRAS 450 L48 (2015) | 10.1093/mnrasl/slv038 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that holographic cosmology implies an evolving Hubble radius
$c^{-1}\dot{R}_H = -1 + 3\Omega_m$ in the presence of a dimensionless matter
density $\Omega_m$ scaled to the closure density $3H^2/8\pi G$, where $c$
denotes the velocity of light and $H$ and $G$ denote the Hubble parameter and
Newton's constan... | [
{
"created": "Mon, 20 Apr 2015 13:25:58 GMT",
"version": "v1"
}
] | 2015-06-24 | [
[
"van Putten",
"Maurice H. P. M.",
""
]
] | It is shown that holographic cosmology implies an evolving Hubble radius $c^{-1}\dot{R}_H = -1 + 3\Omega_m$ in the presence of a dimensionless matter density $\Omega_m$ scaled to the closure density $3H^2/8\pi G$, where $c$ denotes the velocity of light and $H$ and $G$ denote the Hubble parameter and Newton's constant.... |
gr-qc/0605017 | Frederic P. Schuller | Raffaele Punzi, Frederic P. Schuller, Mattias N. R. Wohlfarth | Geometric obstruction of black holes | 50 pages, 2 figures | Annals Phys.322:1335-1372,2007 | 10.1016/j.aop.2006.07.005 | null | gr-qc hep-th | null | We study the global structure of Lorentzian manifolds with partial sectional
curvature bounds. In particular, we prove completeness theorems for homogeneous
and isotropic cosmologies as well as static spherically symmetric spacetimes.
The latter result is used to rigorously prove the absence of static spherically
sym... | [
{
"created": "Tue, 2 May 2006 16:16:56 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Punzi",
"Raffaele",
""
],
[
"Schuller",
"Frederic P.",
""
],
[
"Wohlfarth",
"Mattias N. R.",
""
]
] | We study the global structure of Lorentzian manifolds with partial sectional curvature bounds. In particular, we prove completeness theorems for homogeneous and isotropic cosmologies as well as static spherically symmetric spacetimes. The latter result is used to rigorously prove the absence of static spherically symme... |
1703.08654 | Jie-Xiong Mo | Jie-Xiong Mo, Gu-Qiang Li, Xiao-Bao Xu | Universal ratios of critical physical quantities of charged AdS black
holes | null | null | 10.1088/1475-7516/2018/07/017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the ratios of critical physical quantities related to the
$T-S$ criticality of charged AdS black holes. It is shown that the ratio
$\frac{T_cS_c}{Q_c}$ is universal while $\frac{T_cr_c}{Q_c}$ is not. This
finding is quite interesting considering the former observation that both the
$T-S$ graph and $T-r... | [
{
"created": "Sat, 25 Mar 2017 06:40:05 GMT",
"version": "v1"
}
] | 2018-07-25 | [
[
"Mo",
"Jie-Xiong",
""
],
[
"Li",
"Gu-Qiang",
""
],
[
"Xu",
"Xiao-Bao",
""
]
] | We investigate the ratios of critical physical quantities related to the $T-S$ criticality of charged AdS black holes. It is shown that the ratio $\frac{T_cS_c}{Q_c}$ is universal while $\frac{T_cr_c}{Q_c}$ is not. This finding is quite interesting considering the former observation that both the $T-S$ graph and $T-r_+... |
gr-qc/0207041 | Hendryk Pfeiffer | Daniele Oriti and Hendryk Pfeiffer | A spin foam model for pure gauge theory coupled to quantum gravity | 18 pages, LaTeX, 1 figure, v2: details clarified, references added | Phys.Rev.D66:124010,2002 | 10.1103/PhysRevD.66.124010 | DAMTP-2002-72 | gr-qc hep-th | null | We propose a spin foam model for pure gauge fields coupled to Riemannian
quantum gravity in four dimensions. The model is formulated for the
triangulation of a four-manifold which is given merely combinatorially. The
Riemannian Barrett--Crane model provides the gravity sector of our model and
dynamically assigns geom... | [
{
"created": "Tue, 9 Jul 2002 17:49:40 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Nov 2002 23:30:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Oriti",
"Daniele",
""
],
[
"Pfeiffer",
"Hendryk",
""
]
] | We propose a spin foam model for pure gauge fields coupled to Riemannian quantum gravity in four dimensions. The model is formulated for the triangulation of a four-manifold which is given merely combinatorially. The Riemannian Barrett--Crane model provides the gravity sector of our model and dynamically assigns geomet... |
gr-qc/0110034 | Thomas Thiemann | Thomas Thiemann | Introduction to Modern Canonical Quantum General Relativity | 301 pages, Latex; based in part on the author's Habilitation Thesis
"Mathematische Formulierung der Quanten-Einstein-Gleichungen", University of
Potsdam, Potsdam, Germany, January 2000; submitted to the on-line journal
Living Reviews; subject to being updated on at least a bi-annual basis | null | null | AEI-2001-119 | gr-qc hep-th math-ph math.FA math.MP math.OA math.SG quant-ph | null | This is an introduction to the by now fifteen years old research field of
canonical quantum general relativity, sometimes called "loop quantum gravity".
The term "modern" in the title refers to the fact that the quantum theory is
based on formulating classical general relativity as a theory of connections
rather than... | [
{
"created": "Fri, 5 Oct 2001 18:16:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Thiemann",
"Thomas",
""
]
] | This is an introduction to the by now fifteen years old research field of canonical quantum general relativity, sometimes called "loop quantum gravity". The term "modern" in the title refers to the fact that the quantum theory is based on formulating classical general relativity as a theory of connections rather than m... |
0812.4055 | Aristide Baratin | Aristide Baratin, Cecilia Flori, Thomas Thiemann | The Holst Spin Foam Model via Cubulations | 25 pages, 1 figure; v3: published version. arXiv admin note:
substantial text overlap with arXiv:0911.2135 | New J. Phys. 14 (2012) 103054 | 10.1088/1367-2630/14/10/103054 | AEI-2008-093 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin foam models are an attempt for a covariant, or path integral formulation
of canonical loop quantum gravity. The construction of such models usually rely
on the Plebanski formulation of general relativity as a constrained BF theory
and is based on the discretization of the action on a simplicial triangulation,
wh... | [
{
"created": "Sun, 21 Dec 2008 19:52:38 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Dec 2008 09:42:51 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Nov 2012 11:39:03 GMT",
"version": "v3"
}
] | 2015-05-13 | [
[
"Baratin",
"Aristide",
""
],
[
"Flori",
"Cecilia",
""
],
[
"Thiemann",
"Thomas",
""
]
] | Spin foam models are an attempt for a covariant, or path integral formulation of canonical loop quantum gravity. The construction of such models usually rely on the Plebanski formulation of general relativity as a constrained BF theory and is based on the discretization of the action on a simplicial triangulation, whic... |
1605.01544 | Francesco Cianfrani dr | Francesco Cianfrani | Physical states in Quantum Einstein-Cartan Gravity | 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The definition of physical states is the main technical issue of canonical
approaches towards Quantum Gravity. In this work, we outline how those states
can be found in Einstein-Cartan theory via a continuum limit and they are given
by finite dimensional representations of the Lorentz group.
| [
{
"created": "Thu, 5 May 2016 10:25:23 GMT",
"version": "v1"
}
] | 2016-05-06 | [
[
"Cianfrani",
"Francesco",
""
]
] | The definition of physical states is the main technical issue of canonical approaches towards Quantum Gravity. In this work, we outline how those states can be found in Einstein-Cartan theory via a continuum limit and they are given by finite dimensional representations of the Lorentz group. |
1706.08220 | S. Kalyana Rama | S. Kalyana Rama | Variety of $(d + 1)$ dimensional Cosmological Evolutions with and
without bounce in a class of LQC -- inspired Models | Version 1. 41 pages. Version 2. 41 pages. Remark (3) rewritten -- a
minor change. To appear in General Relativity and Gravitation | General Relativity and Gravitation (2017) 49:113 | 10.1007/s10714-017-2277-9 | IMSc/2017/06/04 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The bouncing evolution of an universe in Loop Quantum Cosmolgy can be
described very well by a set of effective equations, involving a function $sin
\; x$. Recently, we have generalised these effective equations to $(d + 1)$
dimensions and to any function $f(x) \;$. Depending on $f(x) \;$ in these
models inspired by ... | [
{
"created": "Mon, 26 Jun 2017 04:02:51 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jul 2017 06:03:34 GMT",
"version": "v2"
}
] | 2017-08-02 | [
[
"Rama",
"S. Kalyana",
""
]
] | The bouncing evolution of an universe in Loop Quantum Cosmolgy can be described very well by a set of effective equations, involving a function $sin \; x$. Recently, we have generalised these effective equations to $(d + 1)$ dimensions and to any function $f(x) \;$. Depending on $f(x) \;$ in these models inspired by Lo... |
1301.4703 | Patrick Peter | Yi-Fu Cai, Robert Brandenberger and Patrick Peter | Anisotropy in a Nonsingular Bounce | 12 pages, 5 figures | Class. Quantum Grav. 30 (2013) 075019 | 10.1088/0264-9381/30/7/075019 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following recent claims relative to the question of large anisotropy
production in regular bouncing scenarios, we study the evolution of such
anisotropies in a model where an Ekpyrotic phase of contraction is followed by
domination of a Galileon-type Lagrangian which generates a non-singular bounce.
We show that the ... | [
{
"created": "Sun, 20 Jan 2013 22:37:42 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Jan 2013 13:22:35 GMT",
"version": "v2"
}
] | 2013-03-15 | [
[
"Cai",
"Yi-Fu",
""
],
[
"Brandenberger",
"Robert",
""
],
[
"Peter",
"Patrick",
""
]
] | Following recent claims relative to the question of large anisotropy production in regular bouncing scenarios, we study the evolution of such anisotropies in a model where an Ekpyrotic phase of contraction is followed by domination of a Galileon-type Lagrangian which generates a non-singular bounce. We show that the an... |
gr-qc/9803036 | Detlev Buchholz | Hans-Juergen Borchers, Detlev Buchholz | Global Properties of Vacuum States in de Sitter Space | 15 pages, Latex, published version (some typos corrected) | Annales Poincare Phys.Theor. A70 (1999) 23-40 | null | null | gr-qc hep-th | null | Starting from the assumption that vacuum states in de Sitter space look for
any geodesic observer like equilibrium states with some a priori arbitrary
temperature, an analysis of their global properties is carried out in the
algebraic framework of local quantum physics. It is shown that these states
have the Reeh-Sch... | [
{
"created": "Tue, 10 Mar 1998 16:53:55 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Mar 1999 13:23:14 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Borchers",
"Hans-Juergen",
""
],
[
"Buchholz",
"Detlev",
""
]
] | Starting from the assumption that vacuum states in de Sitter space look for any geodesic observer like equilibrium states with some a priori arbitrary temperature, an analysis of their global properties is carried out in the algebraic framework of local quantum physics. It is shown that these states have the Reeh-Schli... |
1808.10526 | H\'ector Hern\'andez | H\'ector Hern\'andez, Luis A. N\'u\~nez and Adriana
V\'asquez-Ram\'irez | Convection and cracking stability of spheres in General Relativity | 16 pages, 5 figures | null | 10.1140/epjc/s10052-018-6365-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we consider convection and cracking instabilities as
well as their interplay. We develop a simple criterion to identify equations of
state unstable to convection, and explore the influence of buoyancy on cracking
(or overturning) for isotropic and anisotropic relativistic spheres. We show
that a ... | [
{
"created": "Thu, 30 Aug 2018 21:23:34 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Sep 2018 17:49:18 GMT",
"version": "v2"
}
] | 2018-11-14 | [
[
"Hernández",
"Héctor",
""
],
[
"Núñez",
"Luis A.",
""
],
[
"Vásquez-Ramírez",
"Adriana",
""
]
] | In the present paper we consider convection and cracking instabilities as well as their interplay. We develop a simple criterion to identify equations of state unstable to convection, and explore the influence of buoyancy on cracking (or overturning) for isotropic and anisotropic relativistic spheres. We show that a de... |
1203.6639 | Johannes Noller | Johannes Noller | Derivative Chameleons | 28 pages, 4 figures | JCAP07(2012)013 | 10.1088/1475-7516/2012/07/013 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider generalized chameleon models where the conformal coupling between
matter and gravitational geometries is not only a function of the chameleon
field \phi, but also of its derivatives via higher order co-ordinate
invariants. Specifically we consider the first such non-trivial conformal
factor A(\phi,X), whe... | [
{
"created": "Thu, 29 Mar 2012 19:32:34 GMT",
"version": "v1"
}
] | 2012-07-10 | [
[
"Noller",
"Johannes",
""
]
] | We consider generalized chameleon models where the conformal coupling between matter and gravitational geometries is not only a function of the chameleon field \phi, but also of its derivatives via higher order co-ordinate invariants. Specifically we consider the first such non-trivial conformal factor A(\phi,X), where... |
2306.17394 | Carlos Albertho Benavides-Gallego | Carlos A. Benavides-Gallego, Jose Miguel Ladino and Eduard Larra\~naga | Comparing spin supplementary conditions for particle motion around
traversable wormholes | 19 pages, 8 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Mathisson-Papapetrou-Dixon (MPD) equations describe the motion of
spinning test particles. It is well-known that these equations, which couple
the Riemann curvature tensor with the antisymmetric spin tensor S, together
with the normalization condition for the four-velocity, is a system of eleven
equations relatin... | [
{
"created": "Fri, 30 Jun 2023 04:17:54 GMT",
"version": "v1"
}
] | 2023-07-03 | [
[
"Benavides-Gallego",
"Carlos A.",
""
],
[
"Ladino",
"Jose Miguel",
""
],
[
"Larrañaga",
"Eduard",
""
]
] | The Mathisson-Papapetrou-Dixon (MPD) equations describe the motion of spinning test particles. It is well-known that these equations, which couple the Riemann curvature tensor with the antisymmetric spin tensor S, together with the normalization condition for the four-velocity, is a system of eleven equations relating ... |
gr-qc/0506126 | Sean A. Hayward | Sean A. Hayward | Formation and evaporation of non-singular black holes | 4 revtex4 pages, 5 eps figures. Correction concerning surface layer,
revised discussion, title change | Phys.Rev.Lett. 96 (2006) 031103 | 10.1103/PhysRevLett.96.031103 | null | gr-qc hep-th | null | Regular (non-singular) space-times are given which describe the formation of
a (locally defined) black hole from an initial vacuum region, its quiescence as
a static region, and its subsequent evaporation to a vacuum region. The static
region is Bardeen-like, supported by finite density and pressures, vanishing
rapid... | [
{
"created": "Tue, 28 Jun 2005 10:23:55 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Dec 2005 21:08:24 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Hayward",
"Sean A.",
""
]
] | Regular (non-singular) space-times are given which describe the formation of a (locally defined) black hole from an initial vacuum region, its quiescence as a static region, and its subsequent evaporation to a vacuum region. The static region is Bardeen-like, supported by finite density and pressures, vanishing rapidly... |
gr-qc/9609056 | Bijan Saha | B. Saha and G. N. Shikin | Interacting Spinor and Scalar Fields in Bianchi type-I Universe filled
with Perfect Fluid: Exact Self-consistent Solutions | LaTex, 15 pages, Submitted to General Relativity and Gravitation | Gen.Rel.Grav. 29 (1997) 1099-1113 | 10.1023/A:1018887024268 | null | gr-qc | null | Self-consistent solutions to interacting spinor and scalar field equations in
General Relativity are studied for the case of Bianchi type-I space-time filled
with perfect fluid. The initial and the asymptotic behavior of the field
functions and the metric one has been thoroughly studied.
| [
{
"created": "Tue, 24 Sep 1996 14:07:16 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Sep 1996 17:52:55 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Saha",
"B.",
""
],
[
"Shikin",
"G. N.",
""
]
] | Self-consistent solutions to interacting spinor and scalar field equations in General Relativity are studied for the case of Bianchi type-I space-time filled with perfect fluid. The initial and the asymptotic behavior of the field functions and the metric one has been thoroughly studied. |
1702.06833 | Oyvind Gron | Matthew T. Aadne and Oivind G. Gron | Exact Solutions of the Field Equations for Empty Space in the Nash
Gravitational Theory | 7 pages | Universe 2017, 3, 10 | 10.3390/universe3010010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | John Nash has proposed a new theory of gravity. We define a Nash-tensor equal
to the curvature tensor appearing in the Nash field equations for empty space,
and calculate its components for two cases. 1. A static, spherically symmetric
space, and 2. The expanding, homogeneous and isotropic space of the
Friedmann-Lema... | [
{
"created": "Mon, 20 Feb 2017 11:17:48 GMT",
"version": "v1"
}
] | 2017-02-23 | [
[
"Aadne",
"Matthew T.",
""
],
[
"Gron",
"Oivind G.",
""
]
] | John Nash has proposed a new theory of gravity. We define a Nash-tensor equal to the curvature tensor appearing in the Nash field equations for empty space, and calculate its components for two cases. 1. A static, spherically symmetric space, and 2. The expanding, homogeneous and isotropic space of the Friedmann-Lemait... |
gr-qc/9505008 | Jose Wadih Maluf | J. W. Maluf and A. Kneip (Universidade de Brasilia) | Gravitational energy of conical defects | 16 pages, LaTex file, no figure, additional text included, to appear
in the J. Math. Phys | J.Math.Phys. 38 (1997) 458-465 | 10.1063/1.531827 | null | gr-qc | null | The energy density of asymptotically flat gravitational fields can be
calculated from a simple expression involving the trace of the torsion tensor.
Integration of this energy density over the whole space yields the ADM energy.
Such expression can be justified within the framework of the teleparallel
equivalent of ge... | [
{
"created": "Sun, 7 May 1995 18:34:24 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Aug 1996 19:27:27 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Maluf",
"J. W.",
"",
"Universidade de Brasilia"
],
[
"Kneip",
"A.",
"",
"Universidade de Brasilia"
]
] | The energy density of asymptotically flat gravitational fields can be calculated from a simple expression involving the trace of the torsion tensor. Integration of this energy density over the whole space yields the ADM energy. Such expression can be justified within the framework of the teleparallel equivalent of gene... |
2309.12604 | Qiyuan Pan | Lina Zhang, Songbai Chen, Qiyuan Pan, Jiliang Jing | Chaotic motion of scalar particle coupling to Chern-Simons invariant in
the stationary axisymmetric Einstein-Maxwell dilaton black hole spacetime | 17 pages, 10 figures | Eur. Phys. J. C 83, 828 (2023) | 10.1140/epjc/s10052-023-12008-6 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigate the motion of a test scalar particle coupling to the
Chern-Simons (CS) invariant in the background of a stationary axisymmetric
black hole in the Einstein-Maxwell-Dilaton-Axion (EMDA) gravity. Comparing with
the case of a Kerr black hole, we observe that the presence of the dilation
parameter makes the... | [
{
"created": "Fri, 22 Sep 2023 03:38:20 GMT",
"version": "v1"
}
] | 2023-09-25 | [
[
"Zhang",
"Lina",
""
],
[
"Chen",
"Songbai",
""
],
[
"Pan",
"Qiyuan",
""
],
[
"Jing",
"Jiliang",
""
]
] | We investigate the motion of a test scalar particle coupling to the Chern-Simons (CS) invariant in the background of a stationary axisymmetric black hole in the Einstein-Maxwell-Dilaton-Axion (EMDA) gravity. Comparing with the case of a Kerr black hole, we observe that the presence of the dilation parameter makes the C... |
2211.16674 | Shio Sakon | Shio Sakon and Leo Tsukada and Heather Fong and Chad Hanna and James
Kennington and Wanting Niu and Shomik Adhicary and Pratyusava Baral and
Amanda Baylor and Kipp Cannon and Sarah Caudill and Bryce Cousins and Jolien
D. E. Creighton and Becca Ewing and Patrick Godwin and Reiko Harada and
Yun-Jing Huang and Rac... | Template bank for compact binary mergers in the fourth observing run of
Advanced LIGO, Advanced Virgo, and KAGRA | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Matched-filtering gravitational wave search pipelines identify gravitational
wave signals by computing correlations, i.e., signal-to-noise ratios, between
gravitational wave detector data and gravitational wave template waveforms.
Intrinsic parameters, the component masses and spins, of the gravitational wave
wavefor... | [
{
"created": "Wed, 30 Nov 2022 01:36:20 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2023 19:20:49 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Apr 2023 00:23:49 GMT",
"version": "v3"
},
{
"created": "Tue, 18 Apr 2023 21:06:17 GMT",
"version": "v4"
},
{
"c... | 2023-12-22 | [
[
"Sakon",
"Shio",
""
],
[
"Tsukada",
"Leo",
""
],
[
"Fong",
"Heather",
""
],
[
"Hanna",
"Chad",
""
],
[
"Kennington",
"James",
""
],
[
"Niu",
"Wanting",
""
],
[
"Adhicary",
"Shomik",
""
],
[
"Baral",... | Matched-filtering gravitational wave search pipelines identify gravitational wave signals by computing correlations, i.e., signal-to-noise ratios, between gravitational wave detector data and gravitational wave template waveforms. Intrinsic parameters, the component masses and spins, of the gravitational wave waveforms... |
1511.04533 | Donato Bini | Donato Bini, Thibault Damour and Andrea Geralico | Confirming and improving post-Newtonian and effective-one-body results
from self-force computations along eccentric orbits around a Schwarzschild
black hole | 14 pages, 3 figures, revtex macros used | Phys. Rev. D 93, 064023 (2016) | 10.1103/PhysRevD.93.064023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically compute, through the six-and-a-half post-Newtonian order, the
second-order-in-eccentricity piece of the Detweiler-Barack-Sago gauge-invariant
redshift function for a small mass in eccentric orbit around a Schwarzschild
black hole. Using the first law of mechanics for eccentric orbits [A. Le Tiec,
Phys... | [
{
"created": "Sat, 14 Nov 2015 09:19:34 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
],
[
"Geralico",
"Andrea",
""
]
] | We analytically compute, through the six-and-a-half post-Newtonian order, the second-order-in-eccentricity piece of the Detweiler-Barack-Sago gauge-invariant redshift function for a small mass in eccentric orbit around a Schwarzschild black hole. Using the first law of mechanics for eccentric orbits [A. Le Tiec, Phys. ... |
1605.02241 | Kofinas Georgios | Georgios Kofinas, Vasilios Zarikas | Asymptotically Safe gravity and non-singular inflationary Big Bang with
vacuum birth | 18 pages, no figures, version to app. in Phys. Rev. D | Phys. Rev. D 94, 103514 (2016) | 10.1103/PhysRevD.94.103514 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General non-singular accelerating cosmological solutions for an initial
cosmic period of pure vacuum birth era are derived. This vacuum era is
described by a varying cosmological "constant" suggested by the Renormalisation
Group flow of Asymptotic Safety scenario near the ultraviolet fixed point. In
this scenario, na... | [
{
"created": "Sat, 7 May 2016 20:17:08 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Oct 2016 20:34:54 GMT",
"version": "v2"
}
] | 2016-11-23 | [
[
"Kofinas",
"Georgios",
""
],
[
"Zarikas",
"Vasilios",
""
]
] | General non-singular accelerating cosmological solutions for an initial cosmic period of pure vacuum birth era are derived. This vacuum era is described by a varying cosmological "constant" suggested by the Renormalisation Group flow of Asymptotic Safety scenario near the ultraviolet fixed point. In this scenario, natu... |
gr-qc/0507009 | Christiane Lechner | Christiane Lechner | Staticity, Self-Similarity and Critical Phenomena in a Self-Gravitating
Nonlinear Sigma Model | PhD thesis, University of Vienna, October 2001, 165 pages, many
figures | null | null | null | gr-qc | null | The main part of the thesis deals with continuously and discretely
self-similar solutions and type II critical phenomena in a family of
self-gravitating non-linear sigma-models. The phenomena strongly depend on the
dimensionless coupling constant. For small couplings we numerically construct
continuously self-similar... | [
{
"created": "Sat, 2 Jul 2005 16:36:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lechner",
"Christiane",
""
]
] | The main part of the thesis deals with continuously and discretely self-similar solutions and type II critical phenomena in a family of self-gravitating non-linear sigma-models. The phenomena strongly depend on the dimensionless coupling constant. For small couplings we numerically construct continuously self-similar (... |
1408.1641 | Stoytcho Yazadjiev | Daniela D. Doneva, Stoytcho S. Yazadjiev, Kalin V. Staykov, Kostas D.
Kokkotas | Universal I-Q relations for rapidly rotating neutron and strange stars
in scalar-tensor theories | 8 pages, 3 figures | null | 10.1103/PhysRevD.90.104021 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study how rapid rotation influences the relation between the normalized
moment of inertia $\bar{I}$ and quadrupole moment $\bar{Q}$ for scalarized
neutron stars. The questions one has to answer are whether the EOS universality
is preserved in this regime and what are the deviations from general
relativity. Our res... | [
{
"created": "Thu, 7 Aug 2014 16:15:24 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Doneva",
"Daniela D.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
],
[
"Staykov",
"Kalin V.",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | We study how rapid rotation influences the relation between the normalized moment of inertia $\bar{I}$ and quadrupole moment $\bar{Q}$ for scalarized neutron stars. The questions one has to answer are whether the EOS universality is preserved in this regime and what are the deviations from general relativity. Our resul... |
1512.09019 | Slava G. Turyshev | Slava G. Turyshev, Nan Yu, and Viktor T. Toth | General relativistic observables for the ACES experiment | 24 pages, 2 figures, 2 tables, revtex4 | Phys. Rev. D 93, 045027 (2016) | 10.1103/PhysRevD.93.045027 | null | gr-qc physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a high-precision model for relativistic observables of the Atomic
Clock Ensemble in Space (ACES) experiment on the International Space Station
(ISS). We develop all relativistic coordinate transformations that are needed
to describe the motion of ACES in Earth orbit and to compute observable
quantities. We... | [
{
"created": "Wed, 30 Dec 2015 17:08:53 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Feb 2016 06:06:06 GMT",
"version": "v2"
}
] | 2016-02-25 | [
[
"Turyshev",
"Slava G.",
""
],
[
"Yu",
"Nan",
""
],
[
"Toth",
"Viktor T.",
""
]
] | We develop a high-precision model for relativistic observables of the Atomic Clock Ensemble in Space (ACES) experiment on the International Space Station (ISS). We develop all relativistic coordinate transformations that are needed to describe the motion of ACES in Earth orbit and to compute observable quantities. We a... |
gr-qc/9802069 | Lee Ashton Wild | Philippos Papadopoulos, Edward Seidel, and Lee Wild | Adaptive computation of gravitational waves from black hole interactions | 16 Pages, RevTeX, 13 figures | Phys.Rev. D58 (1998) 084002 | 10.1103/PhysRevD.58.084002 | null | gr-qc | null | We construct a class of linear partial differential equations describing
general perturbations of non-rotating black holes in 3D Cartesian coordinates.
In contrast to the usual approach, a single equation treats all radiative $\ell
-m$ modes simultaneously, allowing the study of wave perturbations of black
holes with... | [
{
"created": "Fri, 27 Feb 1998 17:08:53 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Papadopoulos",
"Philippos",
""
],
[
"Seidel",
"Edward",
""
],
[
"Wild",
"Lee",
""
]
] | We construct a class of linear partial differential equations describing general perturbations of non-rotating black holes in 3D Cartesian coordinates. In contrast to the usual approach, a single equation treats all radiative $\ell -m$ modes simultaneously, allowing the study of wave perturbations of black holes with a... |
gr-qc/0212122 | Richard Gass | Andrew Royston and Richard Gass | An Optical Analog of a Black Holes | four pages, 1 figure | null | null | null | gr-qc | null | Using media with extremely low group velocities one can create an optical
analog of a curved space-time. Leonhardt and Piwnicki have proposed that a
vortex flow will act as an optical black hole. We show that although the
Leonhardt - Piwnicki flow has an orbit of no return and an infinite red-shift
surface, it is not... | [
{
"created": "Mon, 30 Dec 2002 14:16:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Royston",
"Andrew",
""
],
[
"Gass",
"Richard",
""
]
] | Using media with extremely low group velocities one can create an optical analog of a curved space-time. Leonhardt and Piwnicki have proposed that a vortex flow will act as an optical black hole. We show that although the Leonhardt - Piwnicki flow has an orbit of no return and an infinite red-shift surface, it is not a... |
2308.00765 | Silvia Pla Garc\'ia | Jean Alexandre, Katy Clough and Silvia Pla | Tunnelling-induced cosmic bounce in the presence of anisotropies | 9 pages, 5 figures, minor changes, version accepted for publication
in Physical Review D | Phys. Rev. D 108, 103515 (2023) | 10.1103/PhysRevD.108.103515 | KCL-PH-TH/2023-42 | gr-qc hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | If we imagine rewinding the universe to early times, the scale factor shrinks
and the existence of a finite spatial volume may play a role in quantum
tunnelling effects in a closed universe. It has recently been shown that such
finite volume effects dynamically generate an effective equation of state that
could suppo... | [
{
"created": "Tue, 1 Aug 2023 18:04:17 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2023 16:54:53 GMT",
"version": "v2"
}
] | 2023-11-15 | [
[
"Alexandre",
"Jean",
""
],
[
"Clough",
"Katy",
""
],
[
"Pla",
"Silvia",
""
]
] | If we imagine rewinding the universe to early times, the scale factor shrinks and the existence of a finite spatial volume may play a role in quantum tunnelling effects in a closed universe. It has recently been shown that such finite volume effects dynamically generate an effective equation of state that could support... |
1409.4400 | Artur Alho | Artur Alho, Simone Calogero, Maria P. Machado Ramos and Ana J. Soares | Dynamics of Robertson-Walker spacetimes with diffusion | 19 pages, 4 figures. Matches final version | null | 10.1016/j.aop.2015.01.010 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of spatially homogeneous and isotropic spacetimes
containing a fluid undergoing microscopic velocity diffusion in a cosmological
scalar field. After deriving a few exact solutions of the equations, we
continue by analyzing the qualitative behavior of general solutions. To this
purpose we recast ... | [
{
"created": "Mon, 15 Sep 2014 19:56:22 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Feb 2015 16:28:42 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Alho",
"Artur",
""
],
[
"Calogero",
"Simone",
""
],
[
"Ramos",
"Maria P. Machado",
""
],
[
"Soares",
"Ana J.",
""
]
] | We study the dynamics of spatially homogeneous and isotropic spacetimes containing a fluid undergoing microscopic velocity diffusion in a cosmological scalar field. After deriving a few exact solutions of the equations, we continue by analyzing the qualitative behavior of general solutions. To this purpose we recast th... |
0911.1565 | Gaurav Khanna | Gaurav Khanna | The CBE Hardware Accelerator for Numerical Relativity: A Simple Approach | 5 pages, 2 figures; Accepted for publication in the International
Journal of Modeling, Simulation, and Scientific Computing (IJMSSC) | Int.J.Model.Simul.Sci.Comput.1:147,2010 | 10.1142/S1793962310000043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hardware accelerators (such as the Cell Broadband Engine) have recently
received a significant amount of attention from the computational science
community because they can provide significant gains in the overall performance
of many numerical simulations at a low cost. However, such accelerators usually
employ a rat... | [
{
"created": "Sun, 8 Nov 2009 22:15:49 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Khanna",
"Gaurav",
""
]
] | Hardware accelerators (such as the Cell Broadband Engine) have recently received a significant amount of attention from the computational science community because they can provide significant gains in the overall performance of many numerical simulations at a low cost. However, such accelerators usually employ a rathe... |
0912.4067 | Eduardo Rodrigues | H. P. de Oliveira, E. L. Rodrigues and I. Dami\~ao Soares | The dynamics of apparent horizons in Robinson-Trautman spacetimes | 9 pages, 7 figures | null | 10.1007/s13538-011-0036-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an alternative scheme of finding apparent horizons based on
spectral methods applied to Robinson-Trautman spacetimes. We have considered
distinct initial data such as representing the spheroids of matter and the
head-on collision of two non-rotating black holes. The evolution of the
apparent horizon is pre... | [
{
"created": "Mon, 21 Dec 2009 02:00:16 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"de Oliveira",
"H. P.",
""
],
[
"Rodrigues",
"E. L.",
""
],
[
"Soares",
"I. Damião",
""
]
] | We present an alternative scheme of finding apparent horizons based on spectral methods applied to Robinson-Trautman spacetimes. We have considered distinct initial data such as representing the spheroids of matter and the head-on collision of two non-rotating black holes. The evolution of the apparent horizon is prese... |
2301.00571 | Telem Ibungochouba Singh | Y. Onika Laxmi and T. Ibungochouba Singh | Modified Hawking temperature and entropy of Kerr-de Sitter black hole in
Lorentz violation theory | null | null | null | null | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we discuss the tunneling of scalar particles near the event
horizon of stationary and nonstationary Kerr-de Sitter black hole using Lorentz
violation theory in curved space time. The modified form of Hamilton-Jacobi
equation is derived from the Klein-Gordon equation by applying Lorentz
violation theory... | [
{
"created": "Mon, 2 Jan 2023 09:18:57 GMT",
"version": "v1"
}
] | 2023-01-03 | [
[
"Laxmi",
"Y. Onika",
""
],
[
"Singh",
"T. Ibungochouba",
""
]
] | In this paper, we discuss the tunneling of scalar particles near the event horizon of stationary and nonstationary Kerr-de Sitter black hole using Lorentz violation theory in curved space time. The modified form of Hamilton-Jacobi equation is derived from the Klein-Gordon equation by applying Lorentz violation theory. ... |
1307.7782 | Harald P. Pfeiffer | Harald P. Pfeiffer and Andrew I. MacFadyen | Hyperbolicity of Force-Free Electrodynamics | 11 pages | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the equations of relativistic magnetized plasma dynamics in the
limiting case that electromagnetic stress-energy is dominant over pressure and
rest mass energy density. The naive formulation of these equations is shown to
be not hyperbolic. Modifying the equations by terms that vanish for all
physical solu... | [
{
"created": "Tue, 30 Jul 2013 01:57:58 GMT",
"version": "v1"
}
] | 2013-07-31 | [
[
"Pfeiffer",
"Harald P.",
""
],
[
"MacFadyen",
"Andrew I.",
""
]
] | We analyze the equations of relativistic magnetized plasma dynamics in the limiting case that electromagnetic stress-energy is dominant over pressure and rest mass energy density. The naive formulation of these equations is shown to be not hyperbolic. Modifying the equations by terms that vanish for all physical soluti... |
2105.07075 | Ezequiel Boero | Ezequiel F. Boero and Osvaldo M. Moreschi | Strong gravitational lens image of the M87 black hole with a simple
accreting matter model | 18 pages,16 figures | null | 10.1093/mnras/stab2336 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We study simulated images generated from an accretion disk surrounding the
supermassive black hole hosted in the nearby galaxy M87. We approach the
problem employing very simple accreting models inspired from
magnetohydrodynamical simulations and introducing a new recipe for dealing with
the combined integration of t... | [
{
"created": "Fri, 14 May 2021 21:35:29 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Aug 2021 13:49:38 GMT",
"version": "v2"
}
] | 2021-08-18 | [
[
"Boero",
"Ezequiel F.",
""
],
[
"Moreschi",
"Osvaldo M.",
""
]
] | We study simulated images generated from an accretion disk surrounding the supermassive black hole hosted in the nearby galaxy M87. We approach the problem employing very simple accreting models inspired from magnetohydrodynamical simulations and introducing a new recipe for dealing with the combined integration of the... |
1207.0887 | Alejandro Corichi | Alejandro Corichi | Energy of test objects on black hole spacetimes: A brief review | 16 pages, no figures. Discussion expanded, de Sitter BH case
included. Matches published version | Int Jour Mod Phys D24, No. 14 (2015) 1550103 | 10.1142/S0218271815501035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we review the issue of defining energy for test particles on a
background stationary spacetime. We revisit the different notions of energy as
defined by different observers. As is well known, the existence of a time-like
isometry allows for the notion of total conserved energy to be well defined. We
us... | [
{
"created": "Wed, 4 Jul 2012 03:39:29 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jul 2012 18:09:32 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Sep 2015 19:16:23 GMT",
"version": "v3"
}
] | 2015-09-08 | [
[
"Corichi",
"Alejandro",
""
]
] | In this paper, we review the issue of defining energy for test particles on a background stationary spacetime. We revisit the different notions of energy as defined by different observers. As is well known, the existence of a time-like isometry allows for the notion of total conserved energy to be well defined. We use ... |
2203.06030 | Simon Riquelme | Cristi\'an Erices, Sim\'on Riquelme and Nicol\'as Zalaquett | EFT Approach to Black Hole Scalarization and its Compatibility with
Cosmic Evolution | 28 pages, 3 Figures | null | 10.1103/PhysRevD.106.044046 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the issue of black hole scalarization and its compatibility with
cosmic inflation and big bang cosmology from an effective field theory (EFT)
point of view. In practice, using a well-defined and healthy toy model which
(in part) has been broadly considered in the literature, we consider how
higher-order th... | [
{
"created": "Fri, 11 Mar 2022 15:54:18 GMT",
"version": "v1"
}
] | 2022-09-07 | [
[
"Erices",
"Cristián",
""
],
[
"Riquelme",
"Simón",
""
],
[
"Zalaquett",
"Nicolás",
""
]
] | We address the issue of black hole scalarization and its compatibility with cosmic inflation and big bang cosmology from an effective field theory (EFT) point of view. In practice, using a well-defined and healthy toy model which (in part) has been broadly considered in the literature, we consider how higher-order theo... |
2205.14910 | Xisco Jim\'enez Forteza | Xisco Jim\'enez Forteza, Swetha Bhagwat, Sumit Kumar, Paolo Pani | A novel ringdown amplitude-phase consistency test | Matches the version to appear in PRL | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ringdown signal emitted during a binary black hole coalescence can be
modeled as a linear superposition of the characteristic damped modes of the
remnant black hole that get excited during the merger phase. While checking the
consistency of the measured frequencies and damping times against the Kerr BH
spectrum p... | [
{
"created": "Mon, 30 May 2022 08:10:38 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Nov 2022 06:21:36 GMT",
"version": "v2"
}
] | 2022-11-17 | [
[
"Forteza",
"Xisco Jiménez",
""
],
[
"Bhagwat",
"Swetha",
""
],
[
"Kumar",
"Sumit",
""
],
[
"Pani",
"Paolo",
""
]
] | The ringdown signal emitted during a binary black hole coalescence can be modeled as a linear superposition of the characteristic damped modes of the remnant black hole that get excited during the merger phase. While checking the consistency of the measured frequencies and damping times against the Kerr BH spectrum pre... |
gr-qc/0602112 | Ujjal Debnath | Subenoy Chakraborty, Asit Banerjee, Ujjal Debnath | A New Result on the Dynamical Symmetry of Spherical Collapse | 6 Latex pages, No figure, ReVTeX style | null | null | null | gr-qc | null | A dynamical symmetry for spherical collapse has been studied using a linear
transformation of the initial data set (mass and kinetic energy function) and
the area radius. With proper choice of the initial area radius, the evolution
as well as the physical parameters namely energy density and shear remain
invariant bo... | [
{
"created": "Mon, 27 Feb 2006 13:18:38 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chakraborty",
"Subenoy",
""
],
[
"Banerjee",
"Asit",
""
],
[
"Debnath",
"Ujjal",
""
]
] | A dynamical symmetry for spherical collapse has been studied using a linear transformation of the initial data set (mass and kinetic energy function) and the area radius. With proper choice of the initial area radius, the evolution as well as the physical parameters namely energy density and shear remain invariant both... |
gr-qc/0103063 | Emilio Elizalde | Emilio Elizalde and Sergi R. Hildebrandt | A family of regular quantum interiors for non-rotating black holes I:
The GRNSS spacetimes | latex, 38 pages | null | null | null | gr-qc astro-ph hep-th math-ph math.MP | null | A seemingly natural mechanism is proposed, that could stop the gravitational
collapse of a very massive body. Without needing to change the concept of the
collapsing process itself, that is, without invoking thin layers nor resorting
to asymptoticity (as has been usually done in the literature), it is proven
that a m... | [
{
"created": "Fri, 16 Mar 2001 16:49:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Elizalde",
"Emilio",
""
],
[
"Hildebrandt",
"Sergi R.",
""
]
] | A seemingly natural mechanism is proposed, that could stop the gravitational collapse of a very massive body. Without needing to change the concept of the collapsing process itself, that is, without invoking thin layers nor resorting to asymptoticity (as has been usually done in the literature), it is proven that a mod... |
gr-qc/9603042 | Sergey Krasnikov | S.Krasnikov | Paradoxes of time travel | 9 LaTeX pages, 23k. bezier.sty is desirable, but its absence will
only damage two figures | null | null | null | gr-qc | null | Paradoxes that can supposedly occur if a time machine is created are
discussed. It is shown that the existence of trajectories of ``multiplicity
zero'' (i.e. trajectories that describe a ball hitting its younger self so that
the latter cannot fall into the time machine) is not paradoxical by itself.
This {\em apparen... | [
{
"created": "Mon, 25 Mar 1996 10:12:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Krasnikov",
"S.",
""
]
] | Paradoxes that can supposedly occur if a time machine is created are discussed. It is shown that the existence of trajectories of ``multiplicity zero'' (i.e. trajectories that describe a ball hitting its younger self so that the latter cannot fall into the time machine) is not paradoxical by itself. This {\em apparent ... |
gr-qc/9302004 | null | S.D.Odintsov | Two-loop effective potential in quantum field theory in curved
space-time | 8pages | Phys.Lett.B306:233-236,1993 | 10.1016/0370-2693(93)90073-Q | null | gr-qc | null | The method of the calculation of effective potential (in linear curvature
approximation and at any loop) in massless gauge theory in curved space- time
by the direct solution of RG equation is given.The closed expression for
two-loop effective potential is obtained.Two-loop effective potential in scalar
self-interact... | [
{
"created": "Fri, 5 Feb 1993 16:49:53 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Odintsov",
"S. D.",
""
]
] | The method of the calculation of effective potential (in linear curvature approximation and at any loop) in massless gauge theory in curved space- time by the direct solution of RG equation is given.The closed expression for two-loop effective potential is obtained.Two-loop effective potential in scalar self-interactin... |
0808.2347 | Seyed Hossein Hendi | S. H. Hendi | Rotating Black Branes in Brans-Dicke-Born-Infeld Theory | to be appear in JMP | J.Math.Phys.49:082501,2008 | 10.1063/1.2968342 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present a new class of charged rotating black brane
solutions in the higher dimensional Brans-Dicke-Born-Infeld theory and
investigate their properties. Solving the field equations directly is a
non-trivial task because they include the second derivatives of the scalar
field. We remove this difficul... | [
{
"created": "Mon, 18 Aug 2008 07:26:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hendi",
"S. H.",
""
]
] | In this paper, we present a new class of charged rotating black brane solutions in the higher dimensional Brans-Dicke-Born-Infeld theory and investigate their properties. Solving the field equations directly is a non-trivial task because they include the second derivatives of the scalar field. We remove this difficulty... |
1111.6564 | Franklin Felber | Franklin Felber | Comment on "Reversed gravitational acceleration...", arXiv:1102.2870v2 | 1 page, 2 figures, typographical changes only | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hilbert's 1917 discovery of reversed gravitational acceleration is discussed,
and the connection to arXiv:1102.2870v2 [gr-qc] is explained.
| [
{
"created": "Mon, 28 Nov 2011 19:52:04 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Dec 2014 01:23:05 GMT",
"version": "v2"
}
] | 2014-12-11 | [
[
"Felber",
"Franklin",
""
]
] | Hilbert's 1917 discovery of reversed gravitational acceleration is discussed, and the connection to arXiv:1102.2870v2 [gr-qc] is explained. |
1704.07514 | Vee-Liem Saw | Vee-Liem Saw | Mass loss due to gravitational waves with $\Lambda>0$ | 5 pages. Proceedings from the Conference on Cosmology, Gravitational
Waves and Particles, 6th to 10th of February, 2017, held at the Institute of
Advanced Studies, Nanyang Technological University, Singapore, published as a
brief review in Modern Physics Letters A | Modern Physics Letters A, Vol. 32, No. 22, (2017) 1730020 | 10.1142/S0217732317300208 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theoretical basis for the energy carried away by gravitational waves that
an isolated gravitating system emits was first formulated by Hermann Bondi
during the 1960s. Recent findings from looking at distant supernovae revealed
that the rate of expansion of our universe is accelerating, which may be
well-explained... | [
{
"created": "Tue, 25 Apr 2017 02:05:06 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jun 2017 11:21:24 GMT",
"version": "v2"
}
] | 2017-06-30 | [
[
"Saw",
"Vee-Liem",
""
]
] | The theoretical basis for the energy carried away by gravitational waves that an isolated gravitating system emits was first formulated by Hermann Bondi during the 1960s. Recent findings from looking at distant supernovae revealed that the rate of expansion of our universe is accelerating, which may be well-explained b... |
1410.3909 | Maxim Eingorn | Maxim Brilenkov, Maxim Eingorn, Alexander Zhuk | Lattice Universe: examples and problems | 11 pages, 1 figure | The European Physical Journal C 75, 217 (2015) | 10.1140/epjc/s10052-015-3445-2 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider lattice Universes with spatial topologies $T\times T\times T$,
$\; T\times T\times R\; $ and $\; T\times R\times R$. In the Newtonian limit of
General Relativity, we solve the Poisson equation for the gravitational
potential in the enumerated models. In the case of point-like massive sources
in the $T\tim... | [
{
"created": "Wed, 15 Oct 2014 02:37:13 GMT",
"version": "v1"
},
{
"created": "Sat, 23 May 2015 22:10:58 GMT",
"version": "v2"
}
] | 2015-05-26 | [
[
"Brilenkov",
"Maxim",
""
],
[
"Eingorn",
"Maxim",
""
],
[
"Zhuk",
"Alexander",
""
]
] | We consider lattice Universes with spatial topologies $T\times T\times T$, $\; T\times T\times R\; $ and $\; T\times R\times R$. In the Newtonian limit of General Relativity, we solve the Poisson equation for the gravitational potential in the enumerated models. In the case of point-like massive sources in the $T\times... |
2008.12663 | Paolo Marcoccia | Paolo Marcoccia, Felicia Fredriksson, Alex B. Nielsen and Germano
Nardini | Pearson cross-correlation in the first four black hole binary mergers | 17 pages, 6 figures; matches published version | JCAP 11 (2020) 043 | 10.1088/1475-7516/2020/11/043 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We adopt the Pearson cross-correlation measure to analyze the LIGO Hanford
and LIGO Livingston detector data streams around the events GW150914,
GW151012,GW151226 and GW170104. We find that the Pearson cross-correlation
method is sensitive to these signals, with correlations peaking when the black
hole binaries recon... | [
{
"created": "Fri, 28 Aug 2020 14:02:30 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Aug 2020 12:12:36 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Dec 2020 11:48:14 GMT",
"version": "v3"
}
] | 2020-12-03 | [
[
"Marcoccia",
"Paolo",
""
],
[
"Fredriksson",
"Felicia",
""
],
[
"Nielsen",
"Alex B.",
""
],
[
"Nardini",
"Germano",
""
]
] | We adopt the Pearson cross-correlation measure to analyze the LIGO Hanford and LIGO Livingston detector data streams around the events GW150914, GW151012,GW151226 and GW170104. We find that the Pearson cross-correlation method is sensitive to these signals, with correlations peaking when the black hole binaries reconst... |
gr-qc/0308088 | Bijan Saha | Bijan Saha (LIT, JINR) | Nonlinear spinor field in cosmology | RevTex4, 19 pages, 4 figures | Phys.Rev. D69 (2004) 124006 | 10.1103/PhysRevD.69.124006 | null | gr-qc | null | Within the scope of Bianchi type VI (BVI) model the self-consistent system of
nonlinear spinor and gravitational fields is considered. Exact self-consistent
solutions to the spinor and gravitational field equations are obtained for some
special choice of spatial inhomogeneity and nonlinear spinor term. The role of
in... | [
{
"created": "Thu, 28 Aug 2003 11:33:14 GMT",
"version": "v1"
}
] | 2015-05-01 | [
[
"Saha",
"Bijan",
"",
"LIT, JINR"
]
] | Within the scope of Bianchi type VI (BVI) model the self-consistent system of nonlinear spinor and gravitational fields is considered. Exact self-consistent solutions to the spinor and gravitational field equations are obtained for some special choice of spatial inhomogeneity and nonlinear spinor term. The role of inho... |
gr-qc/9706036 | Ruth Lazkoz Saez | A. Feinstein, J. Ib\'a\~nez, R. Lazkoz | Disks in Expanding FRW Universes | Revised version to appear in ApJ, Latex, 17 pages, 10 figures, uses
aaspp4 and epsf style files | Astrophys.J. 495 (1998) 131 | 10.1086/305276 | EHU-FT/9706 | gr-qc astro-ph | null | We construct exact solutions to Einstein equations which represent
relativistic disks immersed into an expanding FRW Universe. It is shown that
the expansion influences dynamical characteristics of the disks such as
rotational curves, surface mass density, etc. The effects of the expansion is
exemplified with non-sta... | [
{
"created": "Fri, 13 Jun 1997 14:22:15 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Oct 1997 13:58:48 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Feinstein",
"A.",
""
],
[
"Ibáñez",
"J.",
""
],
[
"Lazkoz",
"R.",
""
]
] | We construct exact solutions to Einstein equations which represent relativistic disks immersed into an expanding FRW Universe. It is shown that the expansion influences dynamical characteristics of the disks such as rotational curves, surface mass density, etc. The effects of the expansion is exemplified with non-stati... |
2304.09817 | Tobias Mistele | Tobias Mistele | Comment on "Observational Evidence for Cosmological Coupling of Black
Holes and its Implications for an Astrophysical Source of Dark Energy" | 5 pages | Res. Notes AAS 7 101, 2023 | 10.3847/2515-5172/acd767 | null | gr-qc astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was recently claimed that black holes can explain the accelerated
expansion of the universe. Here I point out that this claim is based on a
confusion about the principle of least action, undermining the link between
black holes and dark energy.
| [
{
"created": "Wed, 19 Apr 2023 17:18:11 GMT",
"version": "v1"
},
{
"created": "Wed, 24 May 2023 19:23:06 GMT",
"version": "v2"
}
] | 2023-05-26 | [
[
"Mistele",
"Tobias",
""
]
] | It was recently claimed that black holes can explain the accelerated expansion of the universe. Here I point out that this claim is based on a confusion about the principle of least action, undermining the link between black holes and dark energy. |
0902.2462 | H Mohseni Sadjadi | H. Mohseni Sadjadi | Crossing the phantom divide line in the Holographic dark energy model in
a closed universe | 10 pages, accepted for publication in Eur. Phys. J. C | Eur.Phys.J.C62:419-424,2009 | 10.1140/epjc/s10052-009-1045-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Conditions needed to cross the phantom divide line in an interacting
holographic dark energy model in closed Friedmann- Robertson-Walker universe
are discussed. The probable relationship between this crossing and the
coincidence problem is studied.
| [
{
"created": "Sat, 14 Feb 2009 12:23:28 GMT",
"version": "v1"
},
{
"created": "Sun, 3 May 2009 11:30:50 GMT",
"version": "v2"
}
] | 2009-07-24 | [
[
"Sadjadi",
"H. Mohseni",
""
]
] | Conditions needed to cross the phantom divide line in an interacting holographic dark energy model in closed Friedmann- Robertson-Walker universe are discussed. The probable relationship between this crossing and the coincidence problem is studied. |
gr-qc/0106036 | Hans-Juergen Schmidt | H.-J. Schmidt | On Ellis' programme within fourth order gravity | 9 pages, LaTeX, no figure | Astron.Nachr. 309 (1988) 307 | null | Report UNIPO-MATH-01-Jun-05 | gr-qc | null | For the non-tachyonic curvature squared action we show that the expanding
Bianchi-type I models tend to the dust-filled Einstein-de Sitter model for t
tending to infinity if the metric is averaged over the typical oscillation
period. Applying a conformal equivalence between curvature squared action and a
minimally co... | [
{
"created": "Mon, 11 Jun 2001 14:28:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schmidt",
"H. -J.",
""
]
] | For the non-tachyonic curvature squared action we show that the expanding Bianchi-type I models tend to the dust-filled Einstein-de Sitter model for t tending to infinity if the metric is averaged over the typical oscillation period. Applying a conformal equivalence between curvature squared action and a minimally coup... |
1011.6401 | Aidan Keane | Aidan J Keane and Brian O J Tupper | Killing tensors in pp-wave spacetimes | 18 pages | Class. Quantum Grav. 27 (2010) 245011 | 10.1088/0264-9381/27/24/245011 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The formal solution of the second order Killing tensor equations for the
general pp-wave spacetime is given. The Killing tensor equations are integrated
fully for some specific pp-wave spacetimes. In particular, the complete
solution is given for the conformally flat plane wave spacetimes and we find
that irreducible... | [
{
"created": "Mon, 29 Nov 2010 22:03:48 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Keane",
"Aidan J",
""
],
[
"Tupper",
"Brian O J",
""
]
] | The formal solution of the second order Killing tensor equations for the general pp-wave spacetime is given. The Killing tensor equations are integrated fully for some specific pp-wave spacetimes. In particular, the complete solution is given for the conformally flat plane wave spacetimes and we find that irreducible K... |
2408.08094 | Bahtiyar \"Ozg\"ur Sar{\i}o\u{g}lu | Deniz Olgu Devecio\u{g}lu, Ulf Lindstr\"om, \"Ozg\"ur Sar{\i}o\u{g}lu | On the maximally symmetric vacua of generic Lovelock gravities | prepared as a contribution to the special issue of "Journal of
Physics A: Mathematical and Theoretical" dedicated to the memory of Stanley
Deser; 20 pages, no figures | null | null | Uppsala Theoretical Physics preprint UUITP-23/24 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We survey elementary features of Lovelock gravity and its maximally symmetric
vacuum solutions. The latter is solely determined by the real roots of a
dimension-dependent polynomial. We also recover the static spherically
symmetric (black hole) solutions of Lovelock gravity using Palais' symmetric
criticality princip... | [
{
"created": "Thu, 15 Aug 2024 11:36:20 GMT",
"version": "v1"
}
] | 2024-08-16 | [
[
"Devecioğlu",
"Deniz Olgu",
""
],
[
"Lindström",
"Ulf",
""
],
[
"Sarıoğlu",
"Özgür",
""
]
] | We survey elementary features of Lovelock gravity and its maximally symmetric vacuum solutions. The latter is solely determined by the real roots of a dimension-dependent polynomial. We also recover the static spherically symmetric (black hole) solutions of Lovelock gravity using Palais' symmetric criticality principle... |
gr-qc/9911101 | Gianluca Cruciani | Gianluca Cruciani | Deriving the Regge-Wheeler and Zerilli equations in the general static
spherically-symmetric case with Mathematica and MathTensor | 6 pages, 3 figures | Nuovo Cim. B115 (2000) 693-698 | null | null | gr-qc | null | An efficient approach to tensor perturbation calculations by proper use of
computer algebra methods is described, reaching the sufficient generality
required for a comprehensive analysis of the Schwarzschild and
Reissner-Nordstroem metric stability.
| [
{
"created": "Thu, 25 Nov 1999 22:28:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cruciani",
"Gianluca",
""
]
] | An efficient approach to tensor perturbation calculations by proper use of computer algebra methods is described, reaching the sufficient generality required for a comprehensive analysis of the Schwarzschild and Reissner-Nordstroem metric stability. |
2004.14738 | Hong Lu | Liang Ma and H. Lu | Vacua and Exact Solutions in Lower-$D$ Limits of EGB | Latex, 19 pages | null | 10.1140/epjc/s10052-020-08780-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the action principles that are the lower dimensional limits of
the Einstein-Gauss-Bonnet gravity {\it via} the Kaluza-Klein route. We study
the vacua and obtain some exact solutions. We find that the reality condition
of the theories may select one vacuum over the other from the two vacua that
typically a... | [
{
"created": "Thu, 30 Apr 2020 12:55:06 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Ma",
"Liang",
""
],
[
"Lu",
"H.",
""
]
] | We consider the action principles that are the lower dimensional limits of the Einstein-Gauss-Bonnet gravity {\it via} the Kaluza-Klein route. We study the vacua and obtain some exact solutions. We find that the reality condition of the theories may select one vacuum over the other from the two vacua that typically ari... |
2005.13732 | David Kubiznak | Robie A. Hennigar, David Kubiznak, Robert B. Mann | Rotating Gauss-Bonnet BTZ Black Holes | 7 pages, 2 figures | null | 10.1088/1361-6382/abce48 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain rotating black hole solutions to the novel 3D Gauss-Bonnet theory
of gravity recently proposed. These solutions generalize the BTZ metric and are
not of constant curvature. They possess an ergoregion and outer horizon, but do
not have an inner horizon. We present their basic properties and show that they
br... | [
{
"created": "Thu, 28 May 2020 01:51:48 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Hennigar",
"Robie A.",
""
],
[
"Kubiznak",
"David",
""
],
[
"Mann",
"Robert B.",
""
]
] | We obtain rotating black hole solutions to the novel 3D Gauss-Bonnet theory of gravity recently proposed. These solutions generalize the BTZ metric and are not of constant curvature. They possess an ergoregion and outer horizon, but do not have an inner horizon. We present their basic properties and show that they brea... |
2007.09135 | James Dent | James B. Dent, William E. Gabella, Kelly Holley-Bockelmann, Thomas W.
Kephart | The Sound of Clearing the Throat: Gravitational Waves from a Black Hole
Orbiting in a Wormhole Geometry | 6 pages, 4 figures | Phys. Rev. D 104, 044030 (2021) | 10.1103/PhysRevD.104.044030 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current ground-based gravitational wave detectors are tuned to capture the
collision of compact objects such as stellar origin black holes and neutron
stars; over 20 such events have been published to date. Theoretically, however,
more exotic compact objects may exist, collisions of which should also generate
copious... | [
{
"created": "Fri, 17 Jul 2020 17:51:04 GMT",
"version": "v1"
}
] | 2021-08-18 | [
[
"Dent",
"James B.",
""
],
[
"Gabella",
"William E.",
""
],
[
"Holley-Bockelmann",
"Kelly",
""
],
[
"Kephart",
"Thomas W.",
""
]
] | Current ground-based gravitational wave detectors are tuned to capture the collision of compact objects such as stellar origin black holes and neutron stars; over 20 such events have been published to date. Theoretically, however, more exotic compact objects may exist, collisions of which should also generate copious g... |
gr-qc/0605031 | Sam Dolan Mr | Sam Dolan, Chris Doran and Anthony Lasenby | Fermion scattering by a Schwarzschild black hole | Minor changes, 1 figure added. Version to appear in Phys. Rev. D. 36
pages, 13 figures | Phys.Rev. D74 (2006) 064005 | 10.1103/PhysRevD.74.064005 | null | gr-qc astro-ph hep-th | null | We study the scattering of massive spin-half waves by a Schwarzschild black
hole using analytical and numerical methods. We begin by extending a recent
perturbation theory calculation to next order to obtain Born series for the
differential cross section and Mott polarization, valid at small couplings. We
continue by... | [
{
"created": "Fri, 5 May 2006 17:19:41 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2006 19:34:46 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Dolan",
"Sam",
""
],
[
"Doran",
"Chris",
""
],
[
"Lasenby",
"Anthony",
""
]
] | We study the scattering of massive spin-half waves by a Schwarzschild black hole using analytical and numerical methods. We begin by extending a recent perturbation theory calculation to next order to obtain Born series for the differential cross section and Mott polarization, valid at small couplings. We continue by d... |
1006.3745 | Ninfa Radicella | Ninfa Radicella and Diego Pav\'on | The generalized second law in universes with quantum corrected entropy
relations | 11 pages, 5 figures, accepted for publication on PLB | Phys.Lett.B691:121-126,2010 | 10.1016/j.physletb.2010.06.019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the generalized second law of thermodynamics to discriminate among
quantum corrections (whether logarithmic or power-law) to the entropy of the
apparent horizon in spatially Friedmann-Robertson-Walker universes. We use the
corresponding modified Friedmann equations along with either Clausius relation
or the ... | [
{
"created": "Fri, 18 Jun 2010 16:38:45 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Radicella",
"Ninfa",
""
],
[
"Pavón",
"Diego",
""
]
] | We apply the generalized second law of thermodynamics to discriminate among quantum corrections (whether logarithmic or power-law) to the entropy of the apparent horizon in spatially Friedmann-Robertson-Walker universes. We use the corresponding modified Friedmann equations along with either Clausius relation or the pr... |
gr-qc/0308070 | T. Padmanabhan | T. Padmanabhan | Entropy of Static Spacetimes and Microscopic Density of States | Extensively revised with more details and clarifications; 12 pages;
accepted for publication in Class.Quant.Grav | Class.Quant.Grav.21:4485-4494,2004 | 10.1088/0264-9381/21/18/013 | null | gr-qc hep-th | null | A general ansatz for gravitational entropy can be provided using the
criterion that, any patch of area which acts as a horizon for a suitably
defined accelerated observer, must have an entropy proportional to its area.
After providing a brief justification for this ansatz, several consequences are
derived: (i) In any... | [
{
"created": "Thu, 21 Aug 2003 14:05:59 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Aug 2004 10:19:27 GMT",
"version": "v2"
}
] | 2011-05-05 | [
[
"Padmanabhan",
"T.",
""
]
] | A general ansatz for gravitational entropy can be provided using the criterion that, any patch of area which acts as a horizon for a suitably defined accelerated observer, must have an entropy proportional to its area. After providing a brief justification for this ansatz, several consequences are derived: (i) In any s... |
gr-qc/9710112 | Lior M. Burko | Lior M. Burko | Structure of the black hole's Cauchy horizon singularity | 4 pages, RevTeX, 4 Encapsulated PostScript figures, submitted to
Phys. Rev. Lett | Phys.Rev.Lett. 79 (1997) 4958-4961 | 10.1103/PhysRevLett.79.4958 | null | gr-qc | null | We study the Cauchy horizon (CH) singularity of a spherical charged black
hole perturbed nonlinearly by a self-gravitating massless scalar field. We show
numerically that the singularity is weak both at the early and at the late
sections of the CH, where the focusing of the area coordinate $r$ is strong. In
the early... | [
{
"created": "Sun, 26 Oct 1997 14:45:16 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Burko",
"Lior M.",
""
]
] | We study the Cauchy horizon (CH) singularity of a spherical charged black hole perturbed nonlinearly by a self-gravitating massless scalar field. We show numerically that the singularity is weak both at the early and at the late sections of the CH, where the focusing of the area coordinate $r$ is strong. In the early s... |
1504.05426 | Zi-Liang Wang | Zi-Liang Wang, Wen-Yuan Ai, Hua Chen, Jian-Bo Deng | A cosmological model from emergence of space | 15 pages, 0 figure, 1 table | Phys. Rev. D 92, 024051 (2015) | 10.1103/PhysRevD.92.024051 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Many studies have been carried out since T.Padmanabhan proposed that the
cosmic acceleration can be understood from the perspective that spacetime
dynamics is an emergent phenomenon. Motivated by such a new paradigm, we
firstly study the de Sitter universe from emergence of space. After that we
investigate the univer... | [
{
"created": "Tue, 21 Apr 2015 13:27:47 GMT",
"version": "v1"
},
{
"created": "Mon, 18 May 2015 08:22:31 GMT",
"version": "v2"
}
] | 2015-08-05 | [
[
"Wang",
"Zi-Liang",
""
],
[
"Ai",
"Wen-Yuan",
""
],
[
"Chen",
"Hua",
""
],
[
"Deng",
"Jian-Bo",
""
]
] | Many studies have been carried out since T.Padmanabhan proposed that the cosmic acceleration can be understood from the perspective that spacetime dynamics is an emergent phenomenon. Motivated by such a new paradigm, we firstly study the de Sitter universe from emergence of space. After that we investigate the universe... |
gr-qc/0506025 | John T. Whelan | John T. Whelan, Sukanta Bose, Jonathan Hanson, Ik Siong Heng, Warren
W. Johnson, Martin P. McHugh, and Peter Zhang | A Data Analysis Technique for the LIGO-ALLEGRO Stochastic Background
Search | 10 pages, LaTeX with IOP style files; 2 encapsulated postscript
figures Submitted to Classical and Quantum Gravity for 2004 GWDAW proceedings | Class.Quant.Grav. 22 (2005) S1087-S1096 | 10.1088/0264-9381/22/18/S23 | null | gr-qc | null | We describe the cross-correlation measurements being carried out on data from
the LIGO Livingston Observatory and the ALLEGRO resonant bar detector. The LIGO
data are sampled at 16384 Hz while the ALLEGRO data are base-banded, i.e.,
heterodyned at 899 Hz and then sampled at 250 Hz. We handle these different
sampling ... | [
{
"created": "Sun, 5 Jun 2005 19:10:04 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Whelan",
"John T.",
""
],
[
"Bose",
"Sukanta",
""
],
[
"Hanson",
"Jonathan",
""
],
[
"Heng",
"Ik Siong",
""
],
[
"Johnson",
"Warren W.",
""
],
[
"McHugh",
"Martin P.",
""
],
[
"Zhang",
"Peter",
""
]
] | We describe the cross-correlation measurements being carried out on data from the LIGO Livingston Observatory and the ALLEGRO resonant bar detector. The LIGO data are sampled at 16384 Hz while the ALLEGRO data are base-banded, i.e., heterodyned at 899 Hz and then sampled at 250 Hz. We handle these different sampling pa... |
1705.01329 | Mohammad Sami | Chao-Qiang Geng, Chung-Chi Lee, M. Sami, Emmanuel N. Saridakis, Alexei
A. Starobinsky | Observational constraints on successful model of quintessential
Inflation | 14 pages,2 tables and six figures.Minor changes in reference section,
to appear in JCAP | JCAP 1706 (2017)011 | 10.1088/1475-7516/2017/06/011 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study quintessential inflation using a generalized exponential potential
$V(\phi)\propto exp(-\lambda \phi^n/Mpl^n), n>1$, the model admits slow-roll
inflation at early times and leads to close-to-scaling behaviour in the post
inflationary era with an exit to dark energy at late times. We present detailed
investig... | [
{
"created": "Wed, 3 May 2017 09:39:10 GMT",
"version": "v1"
},
{
"created": "Mon, 29 May 2017 09:10:58 GMT",
"version": "v2"
}
] | 2017-06-21 | [
[
"Geng",
"Chao-Qiang",
""
],
[
"Lee",
"Chung-Chi",
""
],
[
"Sami",
"M.",
""
],
[
"Saridakis",
"Emmanuel N.",
""
],
[
"Starobinsky",
"Alexei A.",
""
]
] | We study quintessential inflation using a generalized exponential potential $V(\phi)\propto exp(-\lambda \phi^n/Mpl^n), n>1$, the model admits slow-roll inflation at early times and leads to close-to-scaling behaviour in the post inflationary era with an exit to dark energy at late times. We present detailed investigat... |
gr-qc/0606001 | Paulo M. S\'a | Paulo M. S\'a and Brigitte Tom\'e | The influence of differential rotation on the detectability of
gravitational waves from the r-mode instability | 8 pages, 6 figures, revtex4 | Phys.Rev. D74 (2006) 044011 | 10.1103/PhysRevD.74.044011 | null | gr-qc | null | Recently, it was shown that differential rotation is an unavoidable feature
of nonlinear r-modes. We investigate the influence of this differential
rotation on the detectability of gravitational waves emitted by a newly born,
hot, rapidly-rotating neutron star, as it spins down due to the r-mode
instability. We concl... | [
{
"created": "Wed, 31 May 2006 21:09:37 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Sá",
"Paulo M.",
""
],
[
"Tomé",
"Brigitte",
""
]
] | Recently, it was shown that differential rotation is an unavoidable feature of nonlinear r-modes. We investigate the influence of this differential rotation on the detectability of gravitational waves emitted by a newly born, hot, rapidly-rotating neutron star, as it spins down due to the r-mode instability. We conclud... |
1204.2497 | Jessica McIver | Jessica McIver (for the LIGO Scientific Collaboration, and for the
Virgo Collaboration) | Data Quality Studies of Enhanced Interferometric Gravitational Wave
Detectors | 12 pages, 7 figures | null | 10.1088/0264-9381/29/12/124010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Data quality assessment plays an essential role in the quest to detect
gravitational wave signals in data from the LIGO and Virgo interferometric
gravitational wave detectors. Interferometer data contains a high rate of noise
transients from the environment, the detector hardware, and the detector
control systems. Th... | [
{
"created": "Wed, 11 Apr 2012 16:57:14 GMT",
"version": "v1"
}
] | 2019-08-15 | [
[
"McIver",
"Jessica",
"",
"for the LIGO Scientific Collaboration, and for the\n Virgo Collaboration"
]
] | Data quality assessment plays an essential role in the quest to detect gravitational wave signals in data from the LIGO and Virgo interferometric gravitational wave detectors. Interferometer data contains a high rate of noise transients from the environment, the detector hardware, and the detector control systems. Thes... |
2306.10593 | Juan Garcia-Bellido | Juan Garcia-Bellido | Cosmic GREA from SMBH growth | 4 pages | null | null | IFT-UAM/CSIC-23-72 | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | General Relativistic Entropic Acceleration (GREA) gives a general framework
in which to study multiple out-of-equilibrium phenomena in the context of
general relativity, like the late accelerated expansion of the universe or the
formation of galaxies and the large scale structure of the universe. Here we
study the co... | [
{
"created": "Sun, 18 Jun 2023 16:35:44 GMT",
"version": "v1"
}
] | 2023-06-21 | [
[
"Garcia-Bellido",
"Juan",
""
]
] | General Relativistic Entropic Acceleration (GREA) gives a general framework in which to study multiple out-of-equilibrium phenomena in the context of general relativity, like the late accelerated expansion of the universe or the formation of galaxies and the large scale structure of the universe. Here we study the cons... |
gr-qc/0702064 | David Mulryne | Filipe C. Mena, David J. Mulryne, Reza Tavakol | Non-linear vector perturbations in a contracting universe | 16 pages, no figures | Class.Quant.Grav.24:2721-2734,2007 | 10.1088/0264-9381/24/10/015 | DAMTP-2007-12 | gr-qc astro-ph hep-th | null | A number of scalar field models proposed as alternatives to the standard
inflationary scenario involve contracting phases which precede the universe's
present phase of expansion. An important question concerning such models is
whether there are effects which could potentially distinguish them from purely
expanding co... | [
{
"created": "Mon, 12 Feb 2007 18:04:14 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mena",
"Filipe C.",
""
],
[
"Mulryne",
"David J.",
""
],
[
"Tavakol",
"Reza",
""
]
] | A number of scalar field models proposed as alternatives to the standard inflationary scenario involve contracting phases which precede the universe's present phase of expansion. An important question concerning such models is whether there are effects which could potentially distinguish them from purely expanding cosm... |
gr-qc/0107049 | Jacob D. Bekenstein | Jacob D. Bekenstein | Quantum Information and Quantum Black Holes | Lectures delivered at NATO Advanced Study Institute as 17th course of
the International School of Cosmology and Gravitation, Erice, 30 April-10
May, 2001, 26 pages, LaTeX209 with crckab.sty (provided) | in Advances in the Interplay between Quantum and Gravity Physics,
ed. P. G. Bergmann and V. de Sabbata (Kluwer, Dordrecht 2002). pp. 1-26 | null | null | gr-qc astro-ph hep-th quant-ph | null | First, the relation between black holes and limitations on information of
other systems is developed. After reviewing the relation of entropy to
information, we derive the entropy bound, review its applications to cosmology
and its extensions to higher dimensions, and discuss why black holes behave as
1-D objects whe... | [
{
"created": "Fri, 13 Jul 2001 04:47:13 GMT",
"version": "v1"
},
{
"created": "Tue, 28 May 2002 08:45:57 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bekenstein",
"Jacob D.",
""
]
] | First, the relation between black holes and limitations on information of other systems is developed. After reviewing the relation of entropy to information, we derive the entropy bound, review its applications to cosmology and its extensions to higher dimensions, and discuss why black holes behave as 1-D objects when ... |
2006.01390 | Sanjar Shaymatov | Sanjar Shaymatov, Bobomurat Ahmedov, Mubasher Jamil | Testing the weak cosmic censorship conjecture for a
Reissner-Nordstr\"{o}m-de Sitter black hole surrounded by perfect fluid dark
matter | 11 pages, one figure; Title changed and corrections made. Accepted
for publication in Eur. Phys. J. C | Eur. Phys. J. C (2021) 81:588 | 10.1140/epjc/s10052-021-09499-6 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we test the weak cosmic censorship conjecture (WCCC) for the
Reissner-Nordstr\"{o}m-de Sitter (RN-dS) black hole surrounded by perfect fluid
dark matter. We consider a spherically symmetric perturbation on deriving
linear and non-linear order perturbation inequalities by applying new version
of gedanke... | [
{
"created": "Tue, 2 Jun 2020 04:58:44 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jun 2021 19:35:15 GMT",
"version": "v2"
}
] | 2021-09-01 | [
[
"Shaymatov",
"Sanjar",
""
],
[
"Ahmedov",
"Bobomurat",
""
],
[
"Jamil",
"Mubasher",
""
]
] | In this paper, we test the weak cosmic censorship conjecture (WCCC) for the Reissner-Nordstr\"{o}m-de Sitter (RN-dS) black hole surrounded by perfect fluid dark matter. We consider a spherically symmetric perturbation on deriving linear and non-linear order perturbation inequalities by applying new version of gedanken ... |
1703.06850 | Tomasz Stachowiak | Tomasz Stachowiak | Tensor $f(R)$ theory of gravity | Version 1: 21 pages, 6 figures; Version 2: 24 pages, 7 figures,
published text | Phys. Rev. D 96, 044013 (2017) | 10.1103/PhysRevD.96.044013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I propose an alternative $f(R)$ theory of gravity constructed by applying the
function $f$ directly to the Ricci tensor instead of the Ricci scalar. The main
goal of this study is to derive the resulting modified Einstein equations for
the metric case with Levi-Civita connection, as well as for the general
nonmetric ... | [
{
"created": "Mon, 20 Mar 2017 17:09:04 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Aug 2017 09:48:16 GMT",
"version": "v2"
}
] | 2017-08-16 | [
[
"Stachowiak",
"Tomasz",
""
]
] | I propose an alternative $f(R)$ theory of gravity constructed by applying the function $f$ directly to the Ricci tensor instead of the Ricci scalar. The main goal of this study is to derive the resulting modified Einstein equations for the metric case with Levi-Civita connection, as well as for the general nonmetric co... |
2210.12139 | Dina Traykova | Masaru Shibata, Dina Traykova | Properties of scalar wave emission in a scalar-tensor theory with
kinetic screening | 13 pages, 8 figures; Minor changes, version as accepted in PRD | null | 10.1103/PhysRevD.107.044068 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study numerically the scalar wave emission by a non-spherical oscillation
of neutron stars in a scalar-tensor theory of gravity with kinetic screening,
considering both the monopole and quadrupole mode emission. In agreement with
previous results in the literature, we find that the monopole is always
suppressed by... | [
{
"created": "Fri, 21 Oct 2022 17:50:20 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Feb 2023 12:00:27 GMT",
"version": "v2"
}
] | 2023-03-08 | [
[
"Shibata",
"Masaru",
""
],
[
"Traykova",
"Dina",
""
]
] | We study numerically the scalar wave emission by a non-spherical oscillation of neutron stars in a scalar-tensor theory of gravity with kinetic screening, considering both the monopole and quadrupole mode emission. In agreement with previous results in the literature, we find that the monopole is always suppressed by t... |
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