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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2011.14853 | Jun-Qi Guo | Jun-Qi Guo | Dynamics near the central singularity in spherical collapse | 10 pages, 10 figures | J. Phys. Commun. 5, 075015 (2021) | 10.1088/2399-6528/ac1505 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the dynamics near the central singularity in spherically symmetric
collapse of a massless scalar field toward Schwarzschild black hole formation.
The equations of motion take different simplified forms in the early and late
stages of the singularity curve. We report some fine structures of the analytic
solut... | [
{
"created": "Mon, 30 Nov 2020 14:47:56 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Aug 2021 03:30:46 GMT",
"version": "v2"
}
] | 2021-08-03 | [
[
"Guo",
"Jun-Qi",
""
]
] | We study the dynamics near the central singularity in spherically symmetric collapse of a massless scalar field toward Schwarzschild black hole formation. The equations of motion take different simplified forms in the early and late stages of the singularity curve. We report some fine structures of the analytic solutio... |
1911.08750 | Dirk Puetzfeld | Peter A. Hogan, Dirk Puetzfeld | Gravitational clock compass and the detection of gravitational waves | 14 pages, 3 figures | Phys. Rev. D 101, 044012 (2020) | 10.1103/PhysRevD.101.044012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an alternative derivation of the gravitational clock compass and
show how such a device can be used for the detection of gravitational waves.
Explicit compass setups are constructed in special types of space--times,
namely for exact plane gravitational waves and for waves moving radially
relative to an obs... | [
{
"created": "Wed, 20 Nov 2019 07:46:40 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Feb 2020 14:31:38 GMT",
"version": "v2"
}
] | 2020-02-19 | [
[
"Hogan",
"Peter A.",
""
],
[
"Puetzfeld",
"Dirk",
""
]
] | We present an alternative derivation of the gravitational clock compass and show how such a device can be used for the detection of gravitational waves. Explicit compass setups are constructed in special types of space--times, namely for exact plane gravitational waves and for waves moving radially relative to an obser... |
0710.5618 | Kirill Bronnikov | K.A. Bronnikov, O.B. Zaslavskii | Matter sources for a Null Big Bang | 5 two-column pages, revtex4, no figures. One reference corrected.
Final version accepted for publication in Class. Quantum Grav | Class.Quant.Grav.25:105015,2008 | 10.1088/0264-9381/25/10/105015 | null | gr-qc astro-ph hep-th | null | We consider the properties of stress-energy tensors compatible with a Null
Big Bang, i.e., cosmological evolution starting from a Killing horizon rather
than a singularity. For Kantowski-Sachs cosmologies, it is shown that if matter
satisfies the Null Energy Condition (NEC), then (i) regular cosmological
evolution ca... | [
{
"created": "Tue, 30 Oct 2007 11:51:43 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Mar 2008 19:39:03 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Apr 2008 18:18:41 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Zaslavskii",
"O. B.",
""
]
] | We consider the properties of stress-energy tensors compatible with a Null Big Bang, i.e., cosmological evolution starting from a Killing horizon rather than a singularity. For Kantowski-Sachs cosmologies, it is shown that if matter satisfies the Null Energy Condition (NEC), then (i) regular cosmological evolution can ... |
gr-qc/0504072 | Adolfo Zamora | Juan M. Romero and Adolfo Zamora | Note on Quantum Newtonian Cosmology | 10 pages, no figures | null | null | null | gr-qc | null | It is well known that, for pressureless matter, Newtonian and relativistic
cosmologies are equivalent. We show that this equivalence breaks down in the
quantum level. In addition, we find some cases for which quantum Newtonian
cosmology can be related to quantum cosmology in (2+1) dimensions. Two exact
solutions for ... | [
{
"created": "Fri, 15 Apr 2005 22:30:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Romero",
"Juan M.",
""
],
[
"Zamora",
"Adolfo",
""
]
] | It is well known that, for pressureless matter, Newtonian and relativistic cosmologies are equivalent. We show that this equivalence breaks down in the quantum level. In addition, we find some cases for which quantum Newtonian cosmology can be related to quantum cosmology in (2+1) dimensions. Two exact solutions for th... |
1707.02318 | Chenghui Yu | Cheng-Gang Shao, Ya-Fen Chen, Rong Sun, Lu-Shuai Cao, Min-Kang Zhou,
Zhong-Kun Hu, Chenghui Yu and Holger M\"uller | Limits on Lorentz violation in gravity from worldwide superconducting
gravimeters | 5 pages, 1 figure | Phys. Rev. D 97, 024019 (2018) | 10.1103/PhysRevD.97.024019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigated Lorentz violation through anisotropy of gravity using a
worldwide array of 12 superconducting gravimeters. The Lorentz-violating signal
is extracted from the difference between measured gravity and a tidal model. At
the level of sensitivity we reach, ocean tides start to play an important role.
Howeve... | [
{
"created": "Fri, 7 Jul 2017 18:05:27 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2017 17:36:09 GMT",
"version": "v2"
}
] | 2018-01-22 | [
[
"Shao",
"Cheng-Gang",
""
],
[
"Chen",
"Ya-Fen",
""
],
[
"Sun",
"Rong",
""
],
[
"Cao",
"Lu-Shuai",
""
],
[
"Zhou",
"Min-Kang",
""
],
[
"Hu",
"Zhong-Kun",
""
],
[
"Yu",
"Chenghui",
""
],
[
"Müller",
... | We investigated Lorentz violation through anisotropy of gravity using a worldwide array of 12 superconducting gravimeters. The Lorentz-violating signal is extracted from the difference between measured gravity and a tidal model. At the level of sensitivity we reach, ocean tides start to play an important role. However,... |
1001.3517 | Francisco Lobo | Francisco S. N. Lobo, Tiberiu Harko, Zolt\'an Kov\'acs | Solar System tests of Ho\v{r}ava-Lifshitz black holes | 7 pages, 3 figures; talk presented at the II Workshop on Black Holes,
Instituto Superior Tecnico, Lisbon, 21-22 December 2009 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we consider the possibility of observationally testing
Horava gravity at the scale of the Solar System, by considering the classical
tests of general relativity (perihelion precession of the planet Mercury,
deflection of light by the Sun and the radar echo delay) for the
Kehagias-Sfetsos asymptot... | [
{
"created": "Wed, 20 Jan 2010 09:19:07 GMT",
"version": "v1"
}
] | 2010-01-21 | [
[
"Lobo",
"Francisco S. N.",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Kovács",
"Zoltán",
""
]
] | In the present paper we consider the possibility of observationally testing Horava gravity at the scale of the Solar System, by considering the classical tests of general relativity (perihelion precession of the planet Mercury, deflection of light by the Sun and the radar echo delay) for the Kehagias-Sfetsos asymptotic... |
1311.2565 | Yi Pan | Yi Pan, Alessandra Buonanno, Andrea Taracchini, Michael Boyle,
Lawrence E. Kidder, Abdul H. Mroue, Harald P. Pfeiffer, Mark A. Scheel, Bela
Szilagyi, and Anil Zenginoglu | Stability of nonspinning effective-one-body model in approximating
two-body dynamics and gravitational-wave emission | 5 pages, 3 figures | Phys. Rev. D 89, 061501 (2014) | 10.1103/PhysRevD.89.061501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of gravitational waves and the extraction of physical
information from them requires the prediction of accurate waveforms to be used
in template banks. For that purpose, the accuracy of effective-one-body (EOB)
waveforms has been improved over the last years by calibrating them to
numerical-relativity (... | [
{
"created": "Mon, 11 Nov 2013 20:26:02 GMT",
"version": "v1"
}
] | 2014-03-12 | [
[
"Pan",
"Yi",
""
],
[
"Buonanno",
"Alessandra",
""
],
[
"Taracchini",
"Andrea",
""
],
[
"Boyle",
"Michael",
""
],
[
"Kidder",
"Lawrence E.",
""
],
[
"Mroue",
"Abdul H.",
""
],
[
"Pfeiffer",
"Harald P.",
""
... | The detection of gravitational waves and the extraction of physical information from them requires the prediction of accurate waveforms to be used in template banks. For that purpose, the accuracy of effective-one-body (EOB) waveforms has been improved over the last years by calibrating them to numerical-relativity (NR... |
2009.06351 | Badri Krishnan | Neev Khera, Badri Krishnan, Abhay Ashtekar and Tommaso De Lorenzo | Inferring the gravitational wave memory for binary coalescence events | 15 pages, 6 figures | Phys. Rev. D 103, 044012 (2021) | 10.1103/PhysRevD.103.044012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Full, non-linear general relativity predicts a memory effect for
gravitational waves. For compact binary coalescence, the total gravitational
memory serves as an inferred observable, conceptually on the same footing as
the mass and the spin of the final black hole. Given candidate waveforms for
any LIGO event, then, ... | [
{
"created": "Mon, 14 Sep 2020 12:20:49 GMT",
"version": "v1"
}
] | 2021-02-17 | [
[
"Khera",
"Neev",
""
],
[
"Krishnan",
"Badri",
""
],
[
"Ashtekar",
"Abhay",
""
],
[
"De Lorenzo",
"Tommaso",
""
]
] | Full, non-linear general relativity predicts a memory effect for gravitational waves. For compact binary coalescence, the total gravitational memory serves as an inferred observable, conceptually on the same footing as the mass and the spin of the final black hole. Given candidate waveforms for any LIGO event, then, on... |
gr-qc/0603104 | Wu Ning | Ning Wu | Coupling Between the Spin and Gravitational Field and the Equation of
Motion of the Spin | 10 pages, no figures | Commun.Theor.Phys.48:469-472,2007 | 10.1088/0253-6102/48/3/018 | null | gr-qc | null | In general relativity, the equation of motion of the spin is given by the
equation of parallel transport, which is a result of the space-time geometry.
Any result of the space-time geometry can not be directly applied to gauge
theory of gravity. In gauge theory of gravity, based on the viewpoint of the
coupling betwe... | [
{
"created": "Mon, 27 Mar 2006 15:22:15 GMT",
"version": "v1"
}
] | 2009-03-19 | [
[
"Wu",
"Ning",
""
]
] | In general relativity, the equation of motion of the spin is given by the equation of parallel transport, which is a result of the space-time geometry. Any result of the space-time geometry can not be directly applied to gauge theory of gravity. In gauge theory of gravity, based on the viewpoint of the coupling between... |
gr-qc/0102045 | Gabriela Gonzalez | Gabriela Gonzalez (Center for Gravitational Physics and Geometry, The
Pennsylvania State University) | Angular Noise in Gravitational Wave Detectors | 2 pages, to appear in proceedings of the IX Marcel Grossmann meeting,
Rome, 2000 | null | 10.1142/9789812777386_0397 | CGPG-01-2-1 | gr-qc | null | Angular fluctuations of suspended mirrors in gravitational wave
interferometers are a source of noise both for the locking and the operation of
the detectors. We describe here some of the sources of these fluctuations and
methods for the estimation of their order of magnitude.
| [
{
"created": "Sun, 11 Feb 2001 20:08:27 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Gonzalez",
"Gabriela",
"",
"Center for Gravitational Physics and Geometry, The\n Pennsylvania State University"
]
] | Angular fluctuations of suspended mirrors in gravitational wave interferometers are a source of noise both for the locking and the operation of the detectors. We describe here some of the sources of these fluctuations and methods for the estimation of their order of magnitude. |
2210.05434 | Jianwei Mei | Jianwei Mei | A hydrodynamical description of gravitational waves | published version | null | 10.1140/epjc/s10052-022-11160-9 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | It is easy to reason that gravity might be the effect of a fluid in disguise,
as it will naturally arise in emergent gravity models where gravity is due to
the effect of some fundamental particles, with the latter expected to behave
collectively like a fluid at the macroscopic scale. We call this the
fluid/gravity eq... | [
{
"created": "Tue, 11 Oct 2022 13:24:52 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jan 2023 03:38:04 GMT",
"version": "v2"
}
] | 2023-01-16 | [
[
"Mei",
"Jianwei",
""
]
] | It is easy to reason that gravity might be the effect of a fluid in disguise, as it will naturally arise in emergent gravity models where gravity is due to the effect of some fundamental particles, with the latter expected to behave collectively like a fluid at the macroscopic scale. We call this the fluid/gravity equi... |
gr-qc/0207120 | Maeda Hideki | Hideki Maeda, Tomohiro Harada, Hideo Iguchi and Naoya Okuyama | A Classification of Spherically Symmetric Kinematic Self-Similar
Perfect-Fluid Solutions | Revised version, a reference added, 36 pages, 4 tables, no figures,
accepted for publication in Progress of Theoretical Physics | Prog.Theor.Phys. 108 (2002) 819-851 | 10.1143/PTP.108.819 | WU-AP/150/02 | gr-qc | null | We classify all spherically symmetric spacetimes admitting a kinematic
self-similar vector of the second, zeroth or infinite kind. We assume that the
perfect fluid obeys either a polytropic equation of state or an equation of
state of the form $p=K\mu$, where $p$ and $\mu$ are the pressure and the energy
density, res... | [
{
"created": "Tue, 30 Jul 2002 18:17:52 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Sep 2002 08:51:02 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Maeda",
"Hideki",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Iguchi",
"Hideo",
""
],
[
"Okuyama",
"Naoya",
""
]
] | We classify all spherically symmetric spacetimes admitting a kinematic self-similar vector of the second, zeroth or infinite kind. We assume that the perfect fluid obeys either a polytropic equation of state or an equation of state of the form $p=K\mu$, where $p$ and $\mu$ are the pressure and the energy density, respe... |
gr-qc/9605067 | James Coleman | James Coleman (University of Toronto) | On Parallel Transport in Quantum Bundles over Robertson-Walker
Spacetimes | Plain TeX, 17 pages. Updated version contains additional background
material and a couple of minor corrections | null | null | null | gr-qc | null | A recently-developed theory of quantum general relativity provides a
propagator for free-falling particles in curved spacetimes. These propagators
are constructed by parallel-transporting quantum states within a quantum bundle
associated to the Poincare frame bundle. We consider such parallel transport in
the case th... | [
{
"created": "Thu, 30 May 1996 18:48:32 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Dec 1996 01:45:34 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Coleman",
"James",
"",
"University of Toronto"
]
] | A recently-developed theory of quantum general relativity provides a propagator for free-falling particles in curved spacetimes. These propagators are constructed by parallel-transporting quantum states within a quantum bundle associated to the Poincare frame bundle. We consider such parallel transport in the case that... |
1903.04283 | Ercan Kilicarslan | Ercan Kilicarslan | $pp$-waves as exact solutions to ghost-free infinite derivative gravity | 13 pages, references added, end of the Section IV-A is revised,
version published in Phys. Rev. D | Phys. Rev. D 99, 124048 (2019) | 10.1103/PhysRevD.99.124048 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct exact pp-wave solutions of ghost-free infinite derivative
gravity and demonstrate that the sourceless theory does not bring any pp-wave
solutions save for that of Einstein's gravity. These waves described in the
Kerr-Schild form also solve the linearized field equations of the theory. We
also find an exa... | [
{
"created": "Mon, 11 Mar 2019 13:15:08 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Mar 2019 23:23:43 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Jun 2019 08:26:56 GMT",
"version": "v3"
},
{
"created": "Sat, 31 Jul 2021 12:51:33 GMT",
"version": "v4"
}
] | 2021-08-03 | [
[
"Kilicarslan",
"Ercan",
""
]
] | We construct exact pp-wave solutions of ghost-free infinite derivative gravity and demonstrate that the sourceless theory does not bring any pp-wave solutions save for that of Einstein's gravity. These waves described in the Kerr-Schild form also solve the linearized field equations of the theory. We also find an exact... |
gr-qc/0411065 | Allan Joseph Michael Medved | A.J.M. Medved | A follow-up to 'Does Nature abhor a logarithm?' (and apparently she
doesn't) | 4 pages | Class.Quant.Grav. 22 (2005) 5195 | 10.1088/0264-9381/22/23/017 | null | gr-qc hep-th | null | This letter contains a brief discussion on the leading-order canonical
correction to the Bekenstein-Hawking (black hole) entropy. In particular, we
address some recent criticism directed at an earlier commentary.
| [
{
"created": "Mon, 15 Nov 2004 20:56:08 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Medved",
"A. J. M.",
""
]
] | This letter contains a brief discussion on the leading-order canonical correction to the Bekenstein-Hawking (black hole) entropy. In particular, we address some recent criticism directed at an earlier commentary. |
1205.3945 | Thomas Sotiriou | Valerio Faraoni, Vincenzo Vitagliano, Thomas P. Sotiriou, and Stefano
Liberati | Dynamical apparent horizons in inhomogeneous Brans-Dicke universes | 10 pages, 4 figures; v2: minor changes to match published version | Phys. Rev. D 86, 064040 (2012) | 10.1103/PhysRevD.86.064040 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The presence and evolution of apparent horizons in a two-parameter family of
spherically symmetric, time-dependent solutions of Brans-Dicke gravity are
analyzed. These solutions were introduced to model space- and time-varying
gravitational couplings and are supposed to represent central objects embedded
in a spatial... | [
{
"created": "Thu, 17 May 2012 14:52:25 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Sep 2012 12:10:26 GMT",
"version": "v2"
}
] | 2012-09-27 | [
[
"Faraoni",
"Valerio",
""
],
[
"Vitagliano",
"Vincenzo",
""
],
[
"Sotiriou",
"Thomas P.",
""
],
[
"Liberati",
"Stefano",
""
]
] | The presence and evolution of apparent horizons in a two-parameter family of spherically symmetric, time-dependent solutions of Brans-Dicke gravity are analyzed. These solutions were introduced to model space- and time-varying gravitational couplings and are supposed to represent central objects embedded in a spatially... |
2407.01701 | Alireza Rashti | Alireza Rashti and Andrew Noe | Realistic binary neutron star initial data with Elliptica | Elliptica code is now open-source; please see
https://github.com/rashti-alireza/Elliptica | null | null | null | gr-qc astro-ph.SR physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | This work introduces the Elliptica pseudo-spectral code for generating
initial data of binary neutron star systems. Building upon the recent Elliptica
code update, we can now construct initial data using not only piecewise
polytropic equations of state, but also tabulated equations of state for these
binary systems. ... | [
{
"created": "Mon, 1 Jul 2024 18:22:44 GMT",
"version": "v1"
}
] | 2024-07-03 | [
[
"Rashti",
"Alireza",
""
],
[
"Noe",
"Andrew",
""
]
] | This work introduces the Elliptica pseudo-spectral code for generating initial data of binary neutron star systems. Building upon the recent Elliptica code update, we can now construct initial data using not only piecewise polytropic equations of state, but also tabulated equations of state for these binary systems. Fu... |
1905.00100 | Mehdi Rezaei | Mehdi Rezaei, Mohammad Malekjani and Joan Sola | Can dark energy be expressed as a power series of the Hubble parameter? | 20 pages, 6 figures and 8 tables, Accepted in Phys. Rev. D | Phys. Rev. D 100, 023539 (2019) | 10.1103/PhysRevD.100.023539 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we examine the possibility that the dark energy (DE) density,
$\rho_{de}$ can be dynamical and appear as a power series expansion of the
Hubble rate (and its derivatives), i.e.$\rho_{de}(H,\dot{H},...)$. For the
present universe, however, only the terms $H$, $\dot{H}$ and $H^2$ can be
relevant, together ... | [
{
"created": "Tue, 30 Apr 2019 20:51:59 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2019 10:49:52 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Jun 2019 15:55:02 GMT",
"version": "v3"
},
{
"created": "Tue, 2 Jul 2019 06:22:41 GMT",
"version": "v4"
}
] | 2019-07-30 | [
[
"Rezaei",
"Mehdi",
""
],
[
"Malekjani",
"Mohammad",
""
],
[
"Sola",
"Joan",
""
]
] | In this work we examine the possibility that the dark energy (DE) density, $\rho_{de}$ can be dynamical and appear as a power series expansion of the Hubble rate (and its derivatives), i.e.$\rho_{de}(H,\dot{H},...)$. For the present universe, however, only the terms $H$, $\dot{H}$ and $H^2$ can be relevant, together wi... |
1510.05353 | Amir Ghalee | Amir Ghalee | Notes on diffeomorphisms symmetry of $f(R)$ gravity in the cosmological
context | 12 pages, references added. title changed | Eur. Phys. J. C 76: 136, 2016 | 10.1140/epjc/s10052-016-3989-9 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the metric perturbations in the context of restricted $f(R)$
gravity, in which a parameter for deviation from the full diffeomorphisms of
space-time is introduced. We demonstrate that one can choose the parameter to
remove the induced anisotropic stress, which is present in the usual $f(R)$
gravity. Moreover... | [
{
"created": "Mon, 19 Oct 2015 04:47:51 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jan 2016 10:37:42 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Feb 2016 11:20:14 GMT",
"version": "v3"
}
] | 2016-03-15 | [
[
"Ghalee",
"Amir",
""
]
] | We study the metric perturbations in the context of restricted $f(R)$ gravity, in which a parameter for deviation from the full diffeomorphisms of space-time is introduced. We demonstrate that one can choose the parameter to remove the induced anisotropic stress, which is present in the usual $f(R)$ gravity. Moreover, ... |
2404.10236 | Marek Rogatko | Marek Rogatko | Dark photon - dark energy stationary axisymmetric black holes | RevTex, 21 pages, to be published in Phys.Rev. D15 | Phys. Rev. D109 (2024) 104030 | 10.1103/PhysRevD.109.104030 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Using Ernst formalism, stationary axisymmetric black hole solution in
Einstein-dark matter-dark energy gravity has been elaborated. The dark sector
was chosen as dark photon concept, where an auxiliary U(1)-gauge field coupled
to ordinary Maxwell one was introduced, while dark energy was modelled by the
existence of ... | [
{
"created": "Tue, 16 Apr 2024 02:33:19 GMT",
"version": "v1"
}
] | 2024-07-09 | [
[
"Rogatko",
"Marek",
""
]
] | Using Ernst formalism, stationary axisymmetric black hole solution in Einstein-dark matter-dark energy gravity has been elaborated. The dark sector was chosen as dark photon concept, where an auxiliary U(1)-gauge field coupled to ordinary Maxwell one was introduced, while dark energy was modelled by the existence of po... |
1409.3157 | Martin Bojowald | Martin Bojowald | Information loss, made worse by quantum gravity? | 17 pages, 1 figure; v2: new footnotes, new appendices, new
references, new question mark | Front. Phys. 3 (2015) 33 | 10.3389/fphy.2015.00033 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum gravity is often expected to solve both the singularity problem and
the information-loss problem of black holes. This article presents an example
from loop quantum gravity in which the singularity problem is solved in such a
way that the information-loss problem is made worse. Quantum effects in this
scenario... | [
{
"created": "Wed, 10 Sep 2014 17:33:09 GMT",
"version": "v1"
},
{
"created": "Sun, 17 May 2015 16:28:45 GMT",
"version": "v2"
}
] | 2015-05-19 | [
[
"Bojowald",
"Martin",
""
]
] | Quantum gravity is often expected to solve both the singularity problem and the information-loss problem of black holes. This article presents an example from loop quantum gravity in which the singularity problem is solved in such a way that the information-loss problem is made worse. Quantum effects in this scenario, ... |
gr-qc/9605012 | J. Socorro Garcia D. | J. Socorro, V.M. Villanueva, and Luis O. Pimentel | Classical solutions in five dimensional induced matter theory and its
relation to an imperfect fluid | 16 pages, latex, no figures | Int.J.Mod.Phys. A11 (1996) 5495-5504 | 10.1142/S0217751X96002510 | IFUG-JPV1-96 | gr-qc | null | We study five dimensional cosmological models with four dimensional
hypersufaces of the Bianchi type I and V. In this way the five dimensional
vacuum field equations $\rm G_{AB} = 0$, led us to four dimensional matter
equations $\rm G_{\mu\nu}=T_{\mu\nu}$ and the matter is interpreted as a purely
geometrical property... | [
{
"created": "Tue, 7 May 1996 23:37:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Socorro",
"J.",
""
],
[
"Villanueva",
"V. M.",
""
],
[
"Pimentel",
"Luis O.",
""
]
] | We study five dimensional cosmological models with four dimensional hypersufaces of the Bianchi type I and V. In this way the five dimensional vacuum field equations $\rm G_{AB} = 0$, led us to four dimensional matter equations $\rm G_{\mu\nu}=T_{\mu\nu}$ and the matter is interpreted as a purely geometrical property o... |
gr-qc/0404102 | Ali Shojai | Fatimah Shojai, Ali Shojai | Understanding Quantum Theory in Terms of Geometry | 88 Pages, 6 figures. To appear in Progress in Quantum Physics
Research, Nova Science Publishers, Inc., 2004 | null | null | IPM/P2004-015 | gr-qc astro-ph quant-ph | null | Understanding quantum theory in terms of a geometric picture sounds great.
There are different approaches to this idea. Here we shall present a geometric
picture of quantum theory using the de-Broglie--Bohm causal interpretation of
quantum mechanics. We shall show that it is possible to understand the key
character o... | [
{
"created": "Sat, 24 Apr 2004 05:50:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Shojai",
"Fatimah",
""
],
[
"Shojai",
"Ali",
""
]
] | Understanding quantum theory in terms of a geometric picture sounds great. There are different approaches to this idea. Here we shall present a geometric picture of quantum theory using the de-Broglie--Bohm causal interpretation of quantum mechanics. We shall show that it is possible to understand the key character of ... |
gr-qc/0205058 | Stefan Hollands | Stefan Hollands and Robert M. Wald | An Alternative to Inflation | 4th Prize Gravity Research Foundation essay, with minor revisions and
a number of additional footnotes. 12 pages, Latex, no figures | Gen.Rel.Grav. 34 (2002) 2043-2055 | 10.1023/A:1021175216055 | null | gr-qc astro-ph hep-th | null | Inflationary models are generally credited with explaining the large scale
homogeneity, isotropy, and flatness of our universe as well as accounting for
the origin of structure (i.e., the deviations from exact homogeneity) in our
universe. We argue that the explanations provided by inflation for the
homogeneity, isot... | [
{
"created": "Wed, 15 May 2002 15:56:19 GMT",
"version": "v1"
},
{
"created": "Fri, 31 May 2002 19:04:48 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Hollands",
"Stefan",
""
],
[
"Wald",
"Robert M.",
""
]
] | Inflationary models are generally credited with explaining the large scale homogeneity, isotropy, and flatness of our universe as well as accounting for the origin of structure (i.e., the deviations from exact homogeneity) in our universe. We argue that the explanations provided by inflation for the homogeneity, isotro... |
0907.4238 | Richard Woodard | R. P. Woodard (University of Florida) | How Far Are We from the Quantum Theory of Gravity? | 106 page review article solicited by Reports on Progress in Physics | null | 10.1088/0034-4885/72/12/126002 | UFIFT-QG-09-06 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I give a pedagogical explanation of what it is about quantization that makes
general relativity go from being a nearly perfect classical theory to a very
problematic quantum one. I also explain why some quantization of gravity is
unavoidable, why quantum field theories have divergences, why the divergences
of quantum... | [
{
"created": "Fri, 24 Jul 2009 09:06:12 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Woodard",
"R. P.",
"",
"University of Florida"
]
] | I give a pedagogical explanation of what it is about quantization that makes general relativity go from being a nearly perfect classical theory to a very problematic quantum one. I also explain why some quantization of gravity is unavoidable, why quantum field theories have divergences, why the divergences of quantum g... |
2108.09559 | Alfredo Lopez Ortega | M. I. Hernandez-Velazquez, A. Lopez-Ortega | Quasinormal frequencies of a two-dimensional asymptotically anti-de
Sitter black hole of the dilaton gravity theory | 36 pages. 10 figures. Invited contribution to the volume "Quasinormal
Modes in Relativistic Stars and Black Holes". Published in Frontiers in
Physics | Front. Astron. Space Sci. 8: 713422 (2021) | 10.3389/fspas.2021.713422 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We numerically calculate the quasinormal frequencies of the Klein-Gordon and
Dirac fields propagating in a two-dimensional asymptotically anti-de Sitter
black hole of the dilaton gravity theory. For the Klein-Gordon field we use the
Horowitz-Hubeny method and the asymptotic iteration method for second order
different... | [
{
"created": "Sat, 21 Aug 2021 18:06:53 GMT",
"version": "v1"
}
] | 2021-08-24 | [
[
"Hernandez-Velazquez",
"M. I.",
""
],
[
"Lopez-Ortega",
"A.",
""
]
] | We numerically calculate the quasinormal frequencies of the Klein-Gordon and Dirac fields propagating in a two-dimensional asymptotically anti-de Sitter black hole of the dilaton gravity theory. For the Klein-Gordon field we use the Horowitz-Hubeny method and the asymptotic iteration method for second order differentia... |
1709.07774 | Pardyumn Kumar Sahoo | P.K. Sahoo, P.H.R.S. Moraes, Parbati Sahoo | Wormholes in $R^2$-gravity within the $f(R,T)$ formalism | Published version | Eur. Phys. J. C (2018) 78:46 | 10.1140/epjc/s10052-018-5538-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose, as a novelty in the literature, the modelling of wormholes within
the particular case of the $f(R,T)$ gravity, namely $f(R,T)=R+\alpha
R^{2}+\lambda T$, with $R$ and $T$ being the Ricci scalar and trace of the
energy-momentum tensor, respectively, while $\alpha$ and $\lambda$ are
constants. Although such ... | [
{
"created": "Thu, 21 Sep 2017 16:43:01 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Dec 2017 11:11:39 GMT",
"version": "v2"
},
{
"created": "Sat, 20 Jan 2018 01:21:19 GMT",
"version": "v3"
}
] | 2018-01-23 | [
[
"Sahoo",
"P. K.",
""
],
[
"Moraes",
"P. H. R. S.",
""
],
[
"Sahoo",
"Parbati",
""
]
] | We propose, as a novelty in the literature, the modelling of wormholes within the particular case of the $f(R,T)$ gravity, namely $f(R,T)=R+\alpha R^{2}+\lambda T$, with $R$ and $T$ being the Ricci scalar and trace of the energy-momentum tensor, respectively, while $\alpha$ and $\lambda$ are constants. Although such a ... |
1501.03073 | Carsten van de Bruck | C. van de Bruck and J. Morrice | Disformal couplings and the dark sector of the universe | 28 + 1 pages, 15 figures. JCAP style. V3: Reference added; final
version sent to journal | null | 10.1088/1475-7516/2015/04/036 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Interactions between dark matter and dark energy, allowing both conformal and
and disformal couplings, are studied in detail. We discuss the background
evolution, anisotropies in the cosmic microwave background and large scale
structures. One of our main findings is that a large conformal coupling is not
necessarily ... | [
{
"created": "Tue, 13 Jan 2015 16:52:39 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jan 2015 14:24:56 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Mar 2015 17:45:38 GMT",
"version": "v3"
}
] | 2015-06-23 | [
[
"van de Bruck",
"C.",
""
],
[
"Morrice",
"J.",
""
]
] | Interactions between dark matter and dark energy, allowing both conformal and and disformal couplings, are studied in detail. We discuss the background evolution, anisotropies in the cosmic microwave background and large scale structures. One of our main findings is that a large conformal coupling is not necessarily di... |
2407.04791 | Joan Bachs-Esteban | Joan Bachs-Esteban, Il\'idio Lopes, Javier Rubio | Structural Implications of the Chameleon Mechanism on White Dwarfs | 10 + 1 pages, 6 figures | null | null | null | gr-qc astro-ph.HE astro-ph.SR | http://creativecommons.org/licenses/by/4.0/ | We study the impact of the chameleon mechanism on the structure of white
dwarfs. Using a shooting method of our design, we solve the corresponding
scalar-tensor equilibrium equations for a Chandrasekhar equation of state,
exploring various energy scales and couplings of the chameleon field to matter.
We find the cham... | [
{
"created": "Fri, 5 Jul 2024 18:04:53 GMT",
"version": "v1"
}
] | 2024-07-09 | [
[
"Bachs-Esteban",
"Joan",
""
],
[
"Lopes",
"Ilídio",
""
],
[
"Rubio",
"Javier",
""
]
] | We study the impact of the chameleon mechanism on the structure of white dwarfs. Using a shooting method of our design, we solve the corresponding scalar-tensor equilibrium equations for a Chandrasekhar equation of state, exploring various energy scales and couplings of the chameleon field to matter. We find the chamel... |
gr-qc/0107009 | Ruth Lazkoz | J.M. Aguirregabiria, P. Labraga, and Ruth Lazkoz | Assisted inflation in Bianchi VI0 cosmologies | 11 pages | Gen.Rel.Grav. 34 (2002) 341-352 | 10.1023/A:1015351718483 | null | gr-qc | null | Exact models for Bianchi VI0 spacetimes with multiple scalar fields with
exponential potentials have been derived and analysed. It has been shown that
these solutions, when they exist, attract neighbouring solutions in the two
cases corresponding to interacting and non-interacting fields. Unlike the
results obtained ... | [
{
"created": "Tue, 3 Jul 2001 08:10:31 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"Aguirregabiria",
"J. M.",
""
],
[
"Labraga",
"P.",
""
],
[
"Lazkoz",
"Ruth",
""
]
] | Exact models for Bianchi VI0 spacetimes with multiple scalar fields with exponential potentials have been derived and analysed. It has been shown that these solutions, when they exist, attract neighbouring solutions in the two cases corresponding to interacting and non-interacting fields. Unlike the results obtained in... |
1508.02465 | Jose Wadih Maluf Dr. | J. W. Maluf | The Teleparallel Equivalent of General Relativity and the Gravitational
Centre of Mass | 22 pages, no figures, the title has been changed, references added,
published in Universe (100 Years of Chronogeometrodynamics: the Status of the
Einstein's Theory of Gravitation in Its Centennial Year) | Universe, 2016, 2(3), 19 | 10.3390/universe2030019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a brief review of the teleparallel equivalent of general
relativity and analyse the expression for the centre of mass density of the
gravitational field. This expression has not been sufficiently discussed in the
literature. One motivation for the present analysis is the investigation of the
localization o... | [
{
"created": "Tue, 11 Aug 2015 01:38:53 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Sep 2016 14:49:37 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Sep 2016 12:33:42 GMT",
"version": "v3"
}
] | 2016-09-12 | [
[
"Maluf",
"J. W.",
""
]
] | We present a brief review of the teleparallel equivalent of general relativity and analyse the expression for the centre of mass density of the gravitational field. This expression has not been sufficiently discussed in the literature. One motivation for the present analysis is the investigation of the localization of ... |
2209.12610 | Parth Bambhaniya | Parth Bambhaniya, Ashok B. Joshi, Dipanjan Dey, Pankaj S. Joshi,
Arindam Mazumdar, Tomohiro Harada and Ken-ichi Nakao | Relativistic orbits of S2 star in the presence of scalar field | 6 pages, 3 figures, 2 tables | null | null | RUP-22-20, AP-GR-183, NITEP 146 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The general theory of relativity predicts the relativistic effect in the
orbital motions of S-stars which are orbiting around our Milky-way galactic
center. The post-Newtonian or higher-order approximated Schwarzschild black
hole models have been used by GRAVITY and UCLA galactic center groups to
carefully investigat... | [
{
"created": "Mon, 26 Sep 2022 12:03:12 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Oct 2022 12:01:46 GMT",
"version": "v2"
}
] | 2022-10-04 | [
[
"Bambhaniya",
"Parth",
""
],
[
"Joshi",
"Ashok B.",
""
],
[
"Dey",
"Dipanjan",
""
],
[
"Joshi",
"Pankaj S.",
""
],
[
"Mazumdar",
"Arindam",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Nakao",
"Ken-ichi",
""
]
... | The general theory of relativity predicts the relativistic effect in the orbital motions of S-stars which are orbiting around our Milky-way galactic center. The post-Newtonian or higher-order approximated Schwarzschild black hole models have been used by GRAVITY and UCLA galactic center groups to carefully investigate ... |
2207.06978 | Mateo Pascual | Sina Kazemian, Mateo Pascual, Carlo Rovelli, Francesca Vidotto | Diffuse emission from black hole remnants | 8 pages, 4 figures | null | 10.1088/1361-6382/acc232 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We point out that conservation of information implies that remnants produced
at the end of black hole evaporation should radiate in the low-frequency
spectrum. We model this emission and derive properties of the diffuse radiation
emitted by an otherwise dark population of such objects. We show that for early
universe... | [
{
"created": "Thu, 14 Jul 2022 15:01:45 GMT",
"version": "v1"
},
{
"created": "Wed, 3 May 2023 21:05:52 GMT",
"version": "v2"
}
] | 2023-05-05 | [
[
"Kazemian",
"Sina",
""
],
[
"Pascual",
"Mateo",
""
],
[
"Rovelli",
"Carlo",
""
],
[
"Vidotto",
"Francesca",
""
]
] | We point out that conservation of information implies that remnants produced at the end of black hole evaporation should radiate in the low-frequency spectrum. We model this emission and derive properties of the diffuse radiation emitted by an otherwise dark population of such objects. We show that for early universe b... |
2004.03174 | Claus Kiefer | Claus Kiefer | Space, Time, Matter in Quantum Gravity | 18 pages, to appear in "Hundred Years of Gauge Theory", ed. by S. De
Bianchi and C. Kiefer, Springer 2020 | null | 10.1007/978-3-030-51197-5_9 | null | gr-qc hep-th physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concepts of space, time, and matter are of central importance in any
theory of the gravitational field. Here I discuss the role that these concepts
might play in quantum theories of gravity. To be concrete, I will focus on the
most conservative approach, which is quantum geometrodynamics. It turns out
that spacet... | [
{
"created": "Tue, 7 Apr 2020 07:47:01 GMT",
"version": "v1"
}
] | 2021-04-14 | [
[
"Kiefer",
"Claus",
""
]
] | The concepts of space, time, and matter are of central importance in any theory of the gravitational field. Here I discuss the role that these concepts might play in quantum theories of gravity. To be concrete, I will focus on the most conservative approach, which is quantum geometrodynamics. It turns out that spacetim... |
2201.04086 | Damodar Dahal | Damodar Dahal | Application of Common Spatial Patterns in Gravitational Waves Detection | null | null | null | null | gr-qc astro-ph.IM cs.LG cs.NA math.NA | http://creativecommons.org/licenses/by/4.0/ | Common Spatial Patterns (CSP) is a feature extraction algorithm widely used
in Brain-Computer Interface (BCI) Systems for detecting Event-Related
Potentials (ERPs) in multi-channel magneto/electroencephalography (MEG/EEG)
time series data. In this article, we develop and apply a CSP algorithm to the
problem of identi... | [
{
"created": "Tue, 11 Jan 2022 17:23:31 GMT",
"version": "v1"
}
] | 2022-01-13 | [
[
"Dahal",
"Damodar",
""
]
] | Common Spatial Patterns (CSP) is a feature extraction algorithm widely used in Brain-Computer Interface (BCI) Systems for detecting Event-Related Potentials (ERPs) in multi-channel magneto/electroencephalography (MEG/EEG) time series data. In this article, we develop and apply a CSP algorithm to the problem of identify... |
2401.08530 | Yoann Launay | Yoann L. Launay, Gerasimos I. Rigopoulos, E. P. S. Shellard | Stochastic Inflation in General Relativity | 21 pages, 4 figures, reviewed, accepted by PRD and referee, to be
published | null | 10.1103/PhysRevD.109.123523 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We provide a formulation of Stochastic Inflation in full general relativity
that goes beyond the slow-roll and separate universe approximations. We show
how gauge invariant Langevin source terms can be obtained for the complete set
of Einstein equations in their ADM formulation by providing a recipe for
coarse-graini... | [
{
"created": "Tue, 16 Jan 2024 17:50:23 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2024 14:49:52 GMT",
"version": "v2"
}
] | 2024-06-18 | [
[
"Launay",
"Yoann L.",
""
],
[
"Rigopoulos",
"Gerasimos I.",
""
],
[
"Shellard",
"E. P. S.",
""
]
] | We provide a formulation of Stochastic Inflation in full general relativity that goes beyond the slow-roll and separate universe approximations. We show how gauge invariant Langevin source terms can be obtained for the complete set of Einstein equations in their ADM formulation by providing a recipe for coarse-graining... |
gr-qc/9509018 | Carlos Nunez | Luis A. Anchordoqui, Graciela S. Birman, Jose D. Edelstein and Carlos
N\'u\~nez | On Pseudospherically Symmetric Repulsive Gravitational Field | 4 pages, latex, no figures, references added. To be published in the
Proceedings of the XVI Brazilian National Meeting on Particles and Fields | null | null | La Plata-Th 95/23 | gr-qc | null | Solutions of Einstein vacuum equations, for a static pseudospherically
symmetric system, are presented. They describe a naked singularity and a
singular solution with many resemblances to the Schwartzschild solution but
with two major differences: its static region, lying inside the null horizon,
sees the singularity... | [
{
"created": "Fri, 8 Sep 1995 20:05:13 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Mar 1996 16:05:22 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Anchordoqui",
"Luis A.",
""
],
[
"Birman",
"Graciela S.",
""
],
[
"Edelstein",
"Jose D.",
""
],
[
"Núñez",
"Carlos",
""
]
] | Solutions of Einstein vacuum equations, for a static pseudospherically symmetric system, are presented. They describe a naked singularity and a singular solution with many resemblances to the Schwartzschild solution but with two major differences: its static region, lying inside the null horizon, sees the singularity, ... |
gr-qc/0205119 | Ruediger Vaas | Ruediger Vaas | Is there a Darwinian Evolution of the Cosmos? - Some Comments on Lee
Smolin's Theory of the Origin of Universes by Means of Natural Selection | 20 pages; extended version of a contribution to the MicroCosmos -
MacroCosmos conference in Aachen, Germany, September 2-5 1998; finished in
late 1998 and published in the conference proceedings
(http://www.vijlen.com/vip-projects/confs/mima/Vaas/VAAS.html) | null | null | null | gr-qc | null | For Lee Smolin, our universe is only one in a much larger cosmos (the
Multiverse) - a member of a growing community of universes, each one being born
in a bounce following the formation of a black hole. In the course of this, the
values of the free parameters of the physical laws are reprocessed and slightly
changed.... | [
{
"created": "Tue, 28 May 2002 21:17:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vaas",
"Ruediger",
""
]
] | For Lee Smolin, our universe is only one in a much larger cosmos (the Multiverse) - a member of a growing community of universes, each one being born in a bounce following the formation of a black hole. In the course of this, the values of the free parameters of the physical laws are reprocessed and slightly changed. T... |
1606.00517 | Alexander Zhidenko | R. A. Konoplya and A. Zhidenko | Wormholes versus black holes: quasinormal ringing at early and late
times | 13 pages, 4 figures | JCAP12(2016)043 | 10.1088/1475-7516/2016/12/043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently it has been argued that the phantom thin-shell wormholes matched
with the Schwarzschild space-time near the Schwarzschild radius ring like
Schwarzschild black holes at early times, but differently at late times
(arXiv:1602.07309). Here we consider perturbations of the wormhole which was
constructed without t... | [
{
"created": "Thu, 2 Jun 2016 01:36:50 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jun 2016 03:10:49 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Dec 2016 15:09:45 GMT",
"version": "v3"
}
] | 2016-12-30 | [
[
"Konoplya",
"R. A.",
""
],
[
"Zhidenko",
"A.",
""
]
] | Recently it has been argued that the phantom thin-shell wormholes matched with the Schwarzschild space-time near the Schwarzschild radius ring like Schwarzschild black holes at early times, but differently at late times (arXiv:1602.07309). Here we consider perturbations of the wormhole which was constructed without thi... |
1909.01791 | Yuri Obukhov | Friedrich W. Hehl and Yuri N. Obukhov | Conservation of energy-momentum of matter as the basis for the gauge
theory of gravitation | 46 pages, 4 figures, minor corrections, references added,
contribution to "One Hundred Years of Gauge Theory" edited by S. De Bianchi
and C. Kiefer | null | 10.1007/978-3-030-51197-5_10 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to Yang \& Mills (1954), a {\it conserved} current and a related
rigid (`global') symmetry lie at the foundations of gauge theory. When the
rigid symmetry is extended to a {\it local} one, a so-called gauge symmetry, a
new interaction emerges as gauge potential $A$; its field strength is $F\sim
{\rm curl} A... | [
{
"created": "Sun, 1 Sep 2019 16:37:06 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Mar 2020 21:41:42 GMT",
"version": "v2"
},
{
"created": "Sat, 21 Nov 2020 13:56:53 GMT",
"version": "v3"
}
] | 2020-11-24 | [
[
"Hehl",
"Friedrich W.",
""
],
[
"Obukhov",
"Yuri N.",
""
]
] | According to Yang \& Mills (1954), a {\it conserved} current and a related rigid (`global') symmetry lie at the foundations of gauge theory. When the rigid symmetry is extended to a {\it local} one, a so-called gauge symmetry, a new interaction emerges as gauge potential $A$; its field strength is $F\sim {\rm curl} A$.... |
1512.07927 | Manuel Hohmann | Manuel Hohmann | Finsler fluid dynamics in $\mathrm{SO}(4)$ symmetric cosmology | 6 pages, no figures; to appear in the conference proceedings of the
14th Marcel Grossmann Meeting, World Scientific Publishing Company | null | 10.1142/9789813226609_0090 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the most general Finsler spacetime geometry obeying the
cosmological symmetry group $\mathrm{SO}(4)$. On this background geometry we
derive the equations of motion for the most general kinetic fluid obeying the
same cosmological symmetry. For this purpose we propose a set of coordinates on
the tangent bund... | [
{
"created": "Thu, 24 Dec 2015 22:33:15 GMT",
"version": "v1"
}
] | 2017-11-28 | [
[
"Hohmann",
"Manuel",
""
]
] | We discuss the most general Finsler spacetime geometry obeying the cosmological symmetry group $\mathrm{SO}(4)$. On this background geometry we derive the equations of motion for the most general kinetic fluid obeying the same cosmological symmetry. For this purpose we propose a set of coordinates on the tangent bundle... |
2103.14109 | Felipe Falciano | F. T. Falciano, M. L. Pe\~nafiel and J. C. Fabris | Entropy bound in Einstein-Born-Infeld black holes | 13 pages, 5 figures | Phys. Rev. D 103, 084046 (2021) | 10.1103/PhysRevD.103.084046 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the validity of Bekenstein's entropy bound for a charged black hole
in the context of nonlinear electrodynamics. Bekenstein's inequalities are
commonly understood as universal relations between the entropy, the charge, the
momentum, and the energy of a physical system but independent of its dynamics.
In part... | [
{
"created": "Thu, 25 Mar 2021 19:53:05 GMT",
"version": "v1"
}
] | 2021-04-30 | [
[
"Falciano",
"F. T.",
""
],
[
"Peñafiel",
"M. L.",
""
],
[
"Fabris",
"J. C.",
""
]
] | We study the validity of Bekenstein's entropy bound for a charged black hole in the context of nonlinear electrodynamics. Bekenstein's inequalities are commonly understood as universal relations between the entropy, the charge, the momentum, and the energy of a physical system but independent of its dynamics. In partic... |
gr-qc/0402071 | Giovanni Imponente | Giovanni Imponente and Giovanni Montani | Pre-inflationary perturbations spectrum | null | null | 10.1142/9789812704030_0194 | null | gr-qc astro-ph | null | In the framework of a flat FLRW model we derive an inflationary regime in
which the scalar field, laying on the plateau of its potential, admits a linear
time dependence and remains close to a constant value. The behaviour of
inhomogeneous perturbations is determined on the background metric in agreement
to the "slow... | [
{
"created": "Mon, 16 Feb 2004 10:34:24 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Imponente",
"Giovanni",
""
],
[
"Montani",
"Giovanni",
""
]
] | In the framework of a flat FLRW model we derive an inflationary regime in which the scalar field, laying on the plateau of its potential, admits a linear time dependence and remains close to a constant value. The behaviour of inhomogeneous perturbations is determined on the background metric in agreement to the "slow-r... |
1804.03239 | Margaret Millhouse | Margaret Millhouse, Neil J. Cornish, Tyson Littenberg | Bayesian reconstruction of gravitational wave bursts using chirplets | 16 pages, 9 figures | Phys. Rev. D 97, 104057 (2018) | 10.1103/PhysRevD.97.104057 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LIGO-Virgo collaboration uses a variety of techniques to detect and
characterize gravitational waves. One approach is to use templates - models for
the signals derived from Einstein's equations. Another approach is to extract
the signals directly from the coherent response of the detectors in LIGO-Virgo
network. ... | [
{
"created": "Mon, 9 Apr 2018 21:00:37 GMT",
"version": "v1"
}
] | 2018-06-06 | [
[
"Millhouse",
"Margaret",
""
],
[
"Cornish",
"Neil J.",
""
],
[
"Littenberg",
"Tyson",
""
]
] | The LIGO-Virgo collaboration uses a variety of techniques to detect and characterize gravitational waves. One approach is to use templates - models for the signals derived from Einstein's equations. Another approach is to extract the signals directly from the coherent response of the detectors in LIGO-Virgo network. Bo... |
1512.06289 | George Alekseev A. | George A. Alekseev | Solution for "geodesic" motion of a Schwarzschild black hole along a
magnetic field in AdS2 x S2 space-time | 5 pages, 3 figures. Talk given at ES1 Parallel Session of MG14
Meeting (Rome, Italy, July 2015) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exact solution of Einstein - Maxwell equations for a Schwarzschild black
hole immersed in the static spatially homogeneous AdS${}^2\times\mathbb{S}^2$
space-time of Bertotti-Robinson magnetic universe is presented. In this
solution, the black hole possesses a finite initial boost in the direction of
the magnetic ... | [
{
"created": "Sat, 19 Dec 2015 22:00:15 GMT",
"version": "v1"
}
] | 2015-12-22 | [
[
"Alekseev",
"George A.",
""
]
] | The exact solution of Einstein - Maxwell equations for a Schwarzschild black hole immersed in the static spatially homogeneous AdS${}^2\times\mathbb{S}^2$ space-time of Bertotti-Robinson magnetic universe is presented. In this solution, the black hole possesses a finite initial boost in the direction of the magnetic fi... |
gr-qc/9509019 | Luis Anchordoqui | Luis Anchordoqui, Graciela Birman, Santiago Perez Bergliaffa and
H\'ector Vucetich | Variable rest masses in 5-dimensional gravitation confronted with
experimental data | Some references added | Gen.Rel.Grav. 28 (1996) 701-706 | 10.1007/BF02104836 | null | gr-qc | null | Cosmological solutions of Einstein equation for a \mbox{5-dimensional}
space-time, in the case of a dust-filled universe, are presented. With these
solutions we are able to test a hypothetical relation between the rest mass of
a particle and the $5^{\rm th}$ dimension. Comparison with experiment strongly
refutes the ... | [
{
"created": "Fri, 8 Sep 1995 20:30:26 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 1996 22:09:53 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Anchordoqui",
"Luis",
""
],
[
"Birman",
"Graciela",
""
],
[
"Bergliaffa",
"Santiago Perez",
""
],
[
"Vucetich",
"Héctor",
""
]
] | Cosmological solutions of Einstein equation for a \mbox{5-dimensional} space-time, in the case of a dust-filled universe, are presented. With these solutions we are able to test a hypothetical relation between the rest mass of a particle and the $5^{\rm th}$ dimension. Comparison with experiment strongly refutes the im... |
1912.12199 | Farook Rahaman | K N Singh, F Rahaman, N Pradhan and N Pant | Relativistic compact stars in the Kuchowicz spacetime | 18 pages, 18 figures, 2 tables. To appear in Ind. J. Phys | null | 10.1007/s12648-020-01749-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an anisotropic charged analogue of Kuchowicz (1971) solution of
the general relativistic field equations in curvature coordinates by using
simple form of electric intensity $E$ and pressure anisotropy factor $\Delta$
that involve charge parameter $K$ and anisotropy parameter $\alpha$
respectively. Our solu... | [
{
"created": "Mon, 23 Dec 2019 18:40:00 GMT",
"version": "v1"
}
] | 2020-07-15 | [
[
"Singh",
"K N",
""
],
[
"Rahaman",
"F",
""
],
[
"Pradhan",
"N",
""
],
[
"Pant",
"N",
""
]
] | We present an anisotropic charged analogue of Kuchowicz (1971) solution of the general relativistic field equations in curvature coordinates by using simple form of electric intensity $E$ and pressure anisotropy factor $\Delta$ that involve charge parameter $K$ and anisotropy parameter $\alpha$ respectively. Our soluti... |
2303.13271 | Joseph P Johnson | Joseph P Johnson (IIT Bombay, IISER Mohali), Susmita Jana (IIT
Bombay), S. Shankaranarayanan (IIT Bombay) | A test of Einstein's equivalence principle in future VLBI observations | V2: Version accepted in PRD Letters. Results are now compared for
many VLBI experiments; hence, the title and abstract are modified. 11 Pages,
7 figures (including supplementary material) | null | null | null | gr-qc astro-ph.GA astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | We show that very-long-baseline-interferometry (VLBI) observations of
supermassive black holes will allow us to test the fundamental principles of
General Relativity (GR). GR is based on the universality of gravity and
Einstein's equivalence principle (EEP). However, EEP is not a basic principle
of physics but an emp... | [
{
"created": "Thu, 23 Mar 2023 13:52:28 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Dec 2023 06:14:21 GMT",
"version": "v2"
}
] | 2023-12-18 | [
[
"Johnson",
"Joseph P",
"",
"IIT Bombay, IISER Mohali"
],
[
"Jana",
"Susmita",
"",
"IIT\n Bombay"
],
[
"Shankaranarayanan",
"S.",
"",
"IIT Bombay"
]
] | We show that very-long-baseline-interferometry (VLBI) observations of supermassive black holes will allow us to test the fundamental principles of General Relativity (GR). GR is based on the universality of gravity and Einstein's equivalence principle (EEP). However, EEP is not a basic principle of physics but an empir... |
0806.2740 | M Hossain Ali | M. Atiqur Rahman and M. Hossain Ali | Transverse Wave Propagation in Relativistic Two-fluid Plasmas in de
Sitter Space | 19 pages, 12 figures | Gen.Rel.Grav.42:1063-1079,2010 | 10.1007/s10714-009-0891-x | null | gr-qc astro-ph | http://creativecommons.org/licenses/by/3.0/ | We investigate transverse electromagnetic waves propagating in a plasma in
the de Sitter space. Using the 3+1 formalism we derive the relativistic
two-fluid equations to take account of the effects due to the horizon and
describe the set of simultaneous linear equations for the perturbations. We use
a local approxima... | [
{
"created": "Tue, 17 Jun 2008 10:53:03 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Rahman",
"M. Atiqur",
""
],
[
"Ali",
"M. Hossain",
""
]
] | We investigate transverse electromagnetic waves propagating in a plasma in the de Sitter space. Using the 3+1 formalism we derive the relativistic two-fluid equations to take account of the effects due to the horizon and describe the set of simultaneous linear equations for the perturbations. We use a local approximati... |
1902.02731 | Ajit Mehta | Ajit Kumar Mehta, Praveer Tiwari, Nathan K. Johnson-McDaniel, Chandra
Kant Mishra, Vijay Varma, Parameswaran Ajith | Including mode mixing in a higher-multipole model for gravitational
waveforms from nonspinning black-hole binaries | 12 pages, 11 figures, Accepted manuscript | Phys. Rev. D 100, 024032 (2019) | 10.1103/PhysRevD.100.024032 | LIGO-P1800203-v6 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As gravitational-wave (GW) observations of binary black holes are becoming a
precision tool for physics and astronomy, several subdominant effects in the GW
signals need to be accurately modeled. Previous studies have shown that
neglecting subdominant modes in the GW templates causes an unacceptable loss in
detection... | [
{
"created": "Thu, 7 Feb 2019 17:13:21 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jun 2019 10:03:17 GMT",
"version": "v2"
}
] | 2019-07-22 | [
[
"Mehta",
"Ajit Kumar",
""
],
[
"Tiwari",
"Praveer",
""
],
[
"Johnson-McDaniel",
"Nathan K.",
""
],
[
"Mishra",
"Chandra Kant",
""
],
[
"Varma",
"Vijay",
""
],
[
"Ajith",
"Parameswaran",
""
]
] | As gravitational-wave (GW) observations of binary black holes are becoming a precision tool for physics and astronomy, several subdominant effects in the GW signals need to be accurately modeled. Previous studies have shown that neglecting subdominant modes in the GW templates causes an unacceptable loss in detection e... |
gr-qc/0406054 | T. P. Singh | T. P. Singh (Tata Institute of Fundamental Research, Mumbai) | Quantum mechanics without spacetime IV : a noncommutative
Hamilton-Jacobi equation | 5 pages | null | null | null | gr-qc hep-th quant-ph | null | It has earlier been argued that there should exist a formulation of quantum
mechanics which does not refer to a background spacetime. In this paper we
propose that, for a relativistic particle, such a formulation is provided by a
noncommutative generalisation of the Hamilton-Jacobi equation. If a certain
form for the... | [
{
"created": "Sun, 13 Jun 2004 09:37:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Singh",
"T. P.",
"",
"Tata Institute of Fundamental Research, Mumbai"
]
] | It has earlier been argued that there should exist a formulation of quantum mechanics which does not refer to a background spacetime. In this paper we propose that, for a relativistic particle, such a formulation is provided by a noncommutative generalisation of the Hamilton-Jacobi equation. If a certain form for the m... |
2210.14020 | Nicola Franchini | Nicola Franchini, Sebastian H. V\"olkel | A parametrized quasi-normal mode framework for non-Schwarzschild metrics | 5 pages, 2 figures | null | 10.1103/PhysRevD.107.124063 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we comment in more detail on what happens to the parametrized
framework first presented by Cardoso et al. when there are departures from the
Schwarzschild background metric, as well as possible deviations in the
"dynamics". We treat possible deviations in the background metric with
additional coefficient... | [
{
"created": "Tue, 25 Oct 2022 13:43:32 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Oct 2023 09:02:11 GMT",
"version": "v2"
}
] | 2023-10-03 | [
[
"Franchini",
"Nicola",
""
],
[
"Völkel",
"Sebastian H.",
""
]
] | In this work we comment in more detail on what happens to the parametrized framework first presented by Cardoso et al. when there are departures from the Schwarzschild background metric, as well as possible deviations in the "dynamics". We treat possible deviations in the background metric with additional coefficients ... |
0907.3744 | Mikhail Smolyakov | Mikhail N. Smolyakov | Gravity in Brans-Dicke theory with Born-Infeld scalar field and the
Pioneer anomaly | 10 pages, 1 figure, partially changed content | null | 10.1142/S0217751X1004810X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we discuss a model which can be considered as a generalization
of the well-known scalar-tensor Brans-Dicke theory. This model possesses an
interesting feature: due to Born-Infeld type non-linearity of the scalar field
the properties of the interaction between two test bodies depend significantly
on thei... | [
{
"created": "Tue, 21 Jul 2009 20:58:34 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Dec 2009 19:08:20 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Smolyakov",
"Mikhail N.",
""
]
] | In this paper we discuss a model which can be considered as a generalization of the well-known scalar-tensor Brans-Dicke theory. This model possesses an interesting feature: due to Born-Infeld type non-linearity of the scalar field the properties of the interaction between two test bodies depend significantly on their ... |
2012.13954 | Stephan Rosswog | S. Rosswog and P. Diener | SPHINCS_BSSN: A general relativistic Smooth Particle Hydrodynamics code
for dynamical spacetimes | 41 pages, 16 figures; accepted for publication in Classical and
Quantum Gravity | null | 10.1088/1361-6382/abee65 | null | gr-qc astro-ph.HE astro-ph.IM | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We present a new methodology for simulating self-gravitating
general-relativistic fluids. In our approach the fluid is modelled by means of
Lagrangian particles in the framework of a general-relativistic (GR) Smooth
Particle Hydrodynamics (SPH) formulation, while the spacetime is evolved on a
mesh according to the BS... | [
{
"created": "Sun, 27 Dec 2020 14:36:45 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2021 16:39:04 GMT",
"version": "v2"
}
] | 2021-06-09 | [
[
"Rosswog",
"S.",
""
],
[
"Diener",
"P.",
""
]
] | We present a new methodology for simulating self-gravitating general-relativistic fluids. In our approach the fluid is modelled by means of Lagrangian particles in the framework of a general-relativistic (GR) Smooth Particle Hydrodynamics (SPH) formulation, while the spacetime is evolved on a mesh according to the BSSN... |
gr-qc/0312002 | Nikhil Joshi | Nikhil J. Joshi | Gravitational Lensing In Case of Massive Particles | 8 pages, 4 figures, written in Latex | null | null | null | gr-qc | null | Gravitation lensing calculations, which are generally done for light ray, are
extended to that for a massive particle. Many interesting results were
observed. We discuss the scattering cross section along-with many consequential
quantities here. In particular, the case of Schrwarzschild metric was taken as
illustrati... | [
{
"created": "Sun, 30 Nov 2003 11:53:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Joshi",
"Nikhil J.",
""
]
] | Gravitation lensing calculations, which are generally done for light ray, are extended to that for a massive particle. Many interesting results were observed. We discuss the scattering cross section along-with many consequential quantities here. In particular, the case of Schrwarzschild metric was taken as illustration... |
gr-qc/0612122 | Filimonova Irina V | A. Godizov | Numerical Spherically Symmetric Static Solution of the RTG Equations
Outside the Matter | Plenary talk presented at Workshop on High Energy Physics&Field
Theory (Protvino, Russia, 2005) | CentralEur.J.Phys.5:201-206,2007 | 10.2478/s11534-007-0008-7 | HEPFT/2005/15 | gr-qc | null | There was obtained a numerical external solution for the exact system of the
RTG equations with some natural boundary conditions in the static spherically
symmetric case. The properties of the solution are discussed.
| [
{
"created": "Wed, 20 Dec 2006 08:32:43 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Feb 2007 13:17:49 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Godizov",
"A.",
""
]
] | There was obtained a numerical external solution for the exact system of the RTG equations with some natural boundary conditions in the static spherically symmetric case. The properties of the solution are discussed. |
gr-qc/0703069 | Jose M. Martin-Garcia | David Brizuela, Jose M. Martin-Garcia and Guillermo A. Mena Marugan | High-order gauge-invariant perturbations of a spherical spacetime | null | Phys.Rev.D76:024004,2007 | 10.1103/PhysRevD.76.024004 | null | gr-qc | null | We complete the formulation of a general framework for the analysis of
high-order nonspherical perturbations of a four-dimensional spherical spacetime
by including a gauge-invariant description of the perturbations. We present a
general algorithm to construct these invariants and provide explicit formulas
for the cas... | [
{
"created": "Mon, 12 Mar 2007 18:13:15 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Brizuela",
"David",
""
],
[
"Martin-Garcia",
"Jose M.",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
]
] | We complete the formulation of a general framework for the analysis of high-order nonspherical perturbations of a four-dimensional spherical spacetime by including a gauge-invariant description of the perturbations. We present a general algorithm to construct these invariants and provide explicit formulas for the case ... |
gr-qc/9910090 | Alessandro Paulo Servio de Moura | Alessandro P. S. de Moura and Patricio S. Letelier | Scattering map for two black holes | 20 pages, 5 figures, uses REVTEX | Phys.Rev. E62 (2000) 4784-4791 | 10.1103/PhysRevE.62.4784 | null | gr-qc chao-dyn nlin.CD | null | We study the motion of light in the gravitational field of two Schwarzschild
black holes, making the approximation that they are far apart, so that the
motion of light rays in the neighborhood of one black hole can be considered to
be the result of the action of each black hole separately. Using this
approximation, t... | [
{
"created": "Mon, 25 Oct 1999 19:05:55 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"de Moura",
"Alessandro P. S.",
""
],
[
"Letelier",
"Patricio S.",
""
]
] | We study the motion of light in the gravitational field of two Schwarzschild black holes, making the approximation that they are far apart, so that the motion of light rays in the neighborhood of one black hole can be considered to be the result of the action of each black hole separately. Using this approximation, the... |
1505.01263 | Jibitesh Dutta | Jibitesh Dutta, Sourav Haldar and Subenoy Chakraborty | Formation Of Emergent Universe in Brane Scenario as a Consequence of
Particle Creation | 13 pages and 2 figures. Communicated to GRG | null | 10.1007/s10509-015-2607-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we formulate scenario of emergent universe from particle creation
mechanism in spatially flat braneworld models. We consider an isotropic and
homogeneous universe in Braneworld cosmology and universe is considered as a
non-equilibrium thermodynamical system with dissipation due to particle
creation mechanism. As... | [
{
"created": "Wed, 6 May 2015 07:16:10 GMT",
"version": "v1"
},
{
"created": "Thu, 7 May 2015 05:38:10 GMT",
"version": "v2"
}
] | 2016-01-20 | [
[
"Dutta",
"Jibitesh",
""
],
[
"Haldar",
"Sourav",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | Here we formulate scenario of emergent universe from particle creation mechanism in spatially flat braneworld models. We consider an isotropic and homogeneous universe in Braneworld cosmology and universe is considered as a non-equilibrium thermodynamical system with dissipation due to particle creation mechanism. Assu... |
gr-qc/0110056 | G. Papini | G. Papini | Quantum systems in weak gravitational fields | 22 pages. To be published in Proceedings of the 17th Course of the
International School of Cosmology and Gravitation "Advances in the interplay
between quantum and gravity physics" edited by V. De Sabbata and A.
Zheltukhin, Kluwer Academic Publishers, Dordrecht | null | null | null | gr-qc astro-ph | null | Fully covariant wave equations predict the existence of a class of
inertial-gravitational effects that can be tested experimentally. In these
equations inertia and gravity appear as external classical fields, but, by
conforming to general relativity, provide very valuable information on how
Einstein's views carry thr... | [
{
"created": "Thu, 11 Oct 2001 01:33:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Papini",
"G.",
""
]
] | Fully covariant wave equations predict the existence of a class of inertial-gravitational effects that can be tested experimentally. In these equations inertia and gravity appear as external classical fields, but, by conforming to general relativity, provide very valuable information on how Einstein's views carry throu... |
2110.02368 | Andrea Giusti | Valerio Faraoni, Andrea Giusti, Andrea Mentrelli | A new approach to the thermodynamics of scalar-tensor gravity | 23 pages, no figures, to appear in Phys.Rev.D | null | 10.1103/PhysRevD.104.124031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss and expand a new approach to the thermodynamics of scalar-tensor
gravity and its diffusion toward general relativity (seen as an equilibrium
state) proposed in a previous Letter [Phys. Rev. D 103, L121501 (2021)], upon
which we build. We describe scalar-tensor gravity as an effective dissipative
fluid and ... | [
{
"created": "Tue, 5 Oct 2021 21:39:03 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Nov 2021 12:47:08 GMT",
"version": "v2"
}
] | 2022-01-05 | [
[
"Faraoni",
"Valerio",
""
],
[
"Giusti",
"Andrea",
""
],
[
"Mentrelli",
"Andrea",
""
]
] | We discuss and expand a new approach to the thermodynamics of scalar-tensor gravity and its diffusion toward general relativity (seen as an equilibrium state) proposed in a previous Letter [Phys. Rev. D 103, L121501 (2021)], upon which we build. We describe scalar-tensor gravity as an effective dissipative fluid and ap... |
2109.01244 | Cetin Senturk | Metin Gurses, Yaghoub Heydarzade, Cetin Senturk | Kerr-Schild-Kundt Metrics in Generic Gravity Theories with Modified
Horndeski Couplings | 14 pages, no figures | null | 10.1140/epjc/s10052-021-09947-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Kerr-Schild-Kundt (KSK) metrics are known to be one of the universal
metrics in general relativity, which means that they solve the vacuum field
equations of any gravity theory constructed from the curvature tensor and its
higher-order covariant derivatives. There is yet no complete proof that these
metrics are u... | [
{
"created": "Thu, 2 Sep 2021 23:13:04 GMT",
"version": "v1"
}
] | 2022-01-19 | [
[
"Gurses",
"Metin",
""
],
[
"Heydarzade",
"Yaghoub",
""
],
[
"Senturk",
"Cetin",
""
]
] | The Kerr-Schild-Kundt (KSK) metrics are known to be one of the universal metrics in general relativity, which means that they solve the vacuum field equations of any gravity theory constructed from the curvature tensor and its higher-order covariant derivatives. There is yet no complete proof that these metrics are uni... |
1401.1370 | Luca Lusanna | L.Lusanna and M.Villani | Hamiltonian Expression of Curvature Tensors in the York Canonical Basis:
I) The Riemann Tensor and Ricci Scalars | 39 pages. arXiv admin note: text overlap with arXiv:0907.4087 | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using the York canonical basis of ADM tetrad gravity, in a formulation
using radar 4-coordinates for the parametrization of the 3+1 splitting of the
space-time, it is possible to write the 4-Riemann tensor of a globally
hyperbolic, asymptotically Minkowskian space-time as a Hamiltonian tensor,
whose components are... | [
{
"created": "Tue, 7 Jan 2014 13:38:42 GMT",
"version": "v1"
}
] | 2014-01-08 | [
[
"Lusanna",
"L.",
""
],
[
"Villani",
"M.",
""
]
] | By using the York canonical basis of ADM tetrad gravity, in a formulation using radar 4-coordinates for the parametrization of the 3+1 splitting of the space-time, it is possible to write the 4-Riemann tensor of a globally hyperbolic, asymptotically Minkowskian space-time as a Hamiltonian tensor, whose components are 4... |
2012.05338 | Kofinas Georgios | Alfio Bonanno, Georgios Kofinas, Vasilios Zarikas | Effective field equations and scale-dependent couplings in gravity | 21 pages, 12 figures, to appear in PRD | Phys. Rev. D 103, 104025 (2021) | 10.1103/PhysRevD.103.104025 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | A new set of field equations for a space-time dependent Newton's constant
$G(x)$ and cosmological constant $\Lambda(x)$ in the presence of matter is
presented. We prove that it represents the most general mathematically
consistent, physically plausible, set of evolution equations assuming at most
second derivatives i... | [
{
"created": "Wed, 9 Dec 2020 21:57:42 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Apr 2021 19:24:13 GMT",
"version": "v2"
}
] | 2021-05-19 | [
[
"Bonanno",
"Alfio",
""
],
[
"Kofinas",
"Georgios",
""
],
[
"Zarikas",
"Vasilios",
""
]
] | A new set of field equations for a space-time dependent Newton's constant $G(x)$ and cosmological constant $\Lambda(x)$ in the presence of matter is presented. We prove that it represents the most general mathematically consistent, physically plausible, set of evolution equations assuming at most second derivatives in ... |
2109.14571 | Alan Knee | Alan M. Knee, Jess McIver, Miriam Cabero | Prospects for measuring off-axis spins of binary black holes with
Plus-era gravitational-wave detectors | 23 pages, 27 figures. Updated to match version published in ApJ | Astroph. J. 928 (2022) 21 | 10.3847/1538-4357/ac48f5 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The mass and spin properties of binary black holes (BBHs) inferred from their
gravitational-wave signatures reveal important clues about how these systems
form. BBHs originating from isolated binary evolution are expected to have
spins preferentially aligned with their orbital angular momentum, whereas there
is no su... | [
{
"created": "Wed, 29 Sep 2021 17:10:29 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Mar 2022 19:02:43 GMT",
"version": "v2"
}
] | 2022-03-25 | [
[
"Knee",
"Alan M.",
""
],
[
"McIver",
"Jess",
""
],
[
"Cabero",
"Miriam",
""
]
] | The mass and spin properties of binary black holes (BBHs) inferred from their gravitational-wave signatures reveal important clues about how these systems form. BBHs originating from isolated binary evolution are expected to have spins preferentially aligned with their orbital angular momentum, whereas there is no such... |
2010.06739 | Marcus Khuri | Gregory J. Galloway, Marcus A. Khuri, Eric Woolgar | The Topology of General Cosmological Models | 12 pages; final version | null | null | null | gr-qc astro-ph.CO math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Is the universe finite or infinite, and what shape does it have? These
fundamental questions, of which relatively little is known, are typically
studied within the context of the standard model of cosmology where the
universe is assumed to be homogeneous and isotropic. Here we address the above
questions in highly ge... | [
{
"created": "Tue, 13 Oct 2020 23:39:19 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Apr 2021 06:20:06 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Mar 2022 07:30:03 GMT",
"version": "v3"
},
{
"created": "Wed, 1 Jun 2022 05:11:41 GMT",
"version": "v4"
}
] | 2022-06-02 | [
[
"Galloway",
"Gregory J.",
""
],
[
"Khuri",
"Marcus A.",
""
],
[
"Woolgar",
"Eric",
""
]
] | Is the universe finite or infinite, and what shape does it have? These fundamental questions, of which relatively little is known, are typically studied within the context of the standard model of cosmology where the universe is assumed to be homogeneous and isotropic. Here we address the above questions in highly gene... |
1404.7492 | Freddy Zen Permana | Agus Suroso and Freddy P. Zen | Cosmological Model with Nonminimal Derivative Coupling of Scalar Fields
in Five Dimensions | 11 pages, no figure | General Relativity and Gravitation, 2013, vol. 45, Issue 4, pp
799-809 | 10.1007/s10714-013-1500-6 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a nonminimal derivative coupling (NMDC) of scalar field, where the
scalar field is coupled to curvature tensor in the five dimensional universal
extra dimension model. We apply the Einstein equation and find its solution.
First, we consider a special case of pure free scalar field without NMDC and we
find th... | [
{
"created": "Tue, 29 Apr 2014 13:04:16 GMT",
"version": "v1"
}
] | 2014-05-01 | [
[
"Suroso",
"Agus",
""
],
[
"Zen",
"Freddy P.",
""
]
] | We study a nonminimal derivative coupling (NMDC) of scalar field, where the scalar field is coupled to curvature tensor in the five dimensional universal extra dimension model. We apply the Einstein equation and find its solution. First, we consider a special case of pure free scalar field without NMDC and we find that... |
gr-qc/9503050 | Slava Mukhanov | Nathalie Deruelle and V.F. Mukhanov | On matching conditions for cosmological perturbations | 20 pages, latex (revtex), no figures | Phys.Rev.D52:5549-5555,1995 | 10.1103/PhysRevD.52.5549 | null | gr-qc hep-th | null | We derive the matching conditions for cosmological perturbations in a
Friedmann Universe where the equation of state undergoes a sharp jump, for
instance as a result of a phase transition. The physics of the transition which
is needed to follow the fate of the perturbations is clarified. We dissipate
misleading state... | [
{
"created": "Mon, 27 Mar 1995 10:17:23 GMT",
"version": "v1"
}
] | 2009-07-09 | [
[
"Deruelle",
"Nathalie",
""
],
[
"Mukhanov",
"V. F.",
""
]
] | We derive the matching conditions for cosmological perturbations in a Friedmann Universe where the equation of state undergoes a sharp jump, for instance as a result of a phase transition. The physics of the transition which is needed to follow the fate of the perturbations is clarified. We dissipate misleading stateme... |
2208.14667 | Igor Bogush M.Sc. | Igor Bogush, Dmitri Gal'tsov | Supergravity $p$-branes with scalar charge | 29 pages, revtex4 | null | 10.1103/PhysRevD.106.084054 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Standard dilatonic supergravity $p$-branes have scalar charges that are not
independent parameters, but are determined by the brane tension and Page
charges. This feature can be traced to the no-hair theorem in the
four-dimensional Einstein-scalar gravity, implying that more general solutions
with independent scalar ... | [
{
"created": "Wed, 31 Aug 2022 07:50:25 GMT",
"version": "v1"
}
] | 2022-11-09 | [
[
"Bogush",
"Igor",
""
],
[
"Gal'tsov",
"Dmitri",
""
]
] | Standard dilatonic supergravity $p$-branes have scalar charges that are not independent parameters, but are determined by the brane tension and Page charges. This feature can be traced to the no-hair theorem in the four-dimensional Einstein-scalar gravity, implying that more general solutions with independent scalar ch... |
1912.12670 | Alexander B. Balakin | Alexander B. Balakin and Dmitry E. Groshev | New application of the Killing vector field formalism: Modified periodic
potential and two-level profiles of the axionic dark matter distribution | 12 pages, 5 figures, replaced with revised version published in EPJC | Eur. Phys. J. C (2020) 80:145 | 10.1140/epjc/s10052-020-7717-0 | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the structure of halos of the axionic dark matter, which surround
massive relativistic objects with static spherically symmetric gravitational
field and monopole-type magneto-electric fields. We work with the model of
pseudoscalar field with the extended periodic potential, which depends on
additional arg... | [
{
"created": "Sun, 29 Dec 2019 15:17:10 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Feb 2020 20:17:31 GMT",
"version": "v2"
}
] | 2020-02-24 | [
[
"Balakin",
"Alexander B.",
""
],
[
"Groshev",
"Dmitry E.",
""
]
] | We consider the structure of halos of the axionic dark matter, which surround massive relativistic objects with static spherically symmetric gravitational field and monopole-type magneto-electric fields. We work with the model of pseudoscalar field with the extended periodic potential, which depends on additional argum... |
gr-qc/0603069 | Robert T. Jantzen | Robert T. Jantzen, and James W. York, Jr | New Minimal Distortion Shift Gauge | 5 page ReVTeX4 twocolumn latex file, no figures; slight revision:
last sentence of section 2 deleted and replaced, citations reordered,
additonal paragraph added to introduction with short explanation of the
initial value problem and its thin sandwich variation, Yvonne Choquet-Bruhat
reference added and acknowl... | Phys.Rev. D73 (2006) 104008 | 10.1103/PhysRevD.73.104008 | null | gr-qc | null | Based on the recent understanding of the role of the densitized lapse
function in Einstein's equations and of the proper way to pose the thin
sandwich problem, a slight readjustment of the minimal distortion shift gauge
in the 3+1 approach to the dynamics of general relativity allows this shift
vector to serve as the... | [
{
"created": "Thu, 16 Mar 2006 17:30:39 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Mar 2006 01:06:01 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Mar 2006 00:09:59 GMT",
"version": "v3"
},
{
"created": "Thu, 6 Apr 2006 00:07:00 GMT",
"version": "v4"
}
] | 2012-08-27 | [
[
"Jantzen",
"Robert T.",
""
],
[
"York,",
"James W.",
"Jr"
]
] | Based on the recent understanding of the role of the densitized lapse function in Einstein's equations and of the proper way to pose the thin sandwich problem, a slight readjustment of the minimal distortion shift gauge in the 3+1 approach to the dynamics of general relativity allows this shift vector to serve as the v... |
2206.04076 | Sebastian Steinhaus | Masooma Ali and Sebastian Steinhaus | Toward matter dynamics in spin foam quantum gravity | 32 pages, 17 figures, v2: updated title, improved several parts, e.g.
discussion of results, added references. Matches version accepted for
publication in Phys. Rev. D | Phys. Rev. D 106, 106016 2022 | 10.1103/PhysRevD.106.106016 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Any approach to pure quantum gravity must eventually face the question of
coupling quantum matter to the theory. In the past, several ways of coupling
matter to spin foam quantum gravity have been proposed, but the dynamics of the
coupled matter-gravity system is challenging to explore. To take first steps
towards un... | [
{
"created": "Wed, 8 Jun 2022 18:00:02 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Nov 2022 15:39:19 GMT",
"version": "v2"
}
] | 2022-11-30 | [
[
"Ali",
"Masooma",
""
],
[
"Steinhaus",
"Sebastian",
""
]
] | Any approach to pure quantum gravity must eventually face the question of coupling quantum matter to the theory. In the past, several ways of coupling matter to spin foam quantum gravity have been proposed, but the dynamics of the coupled matter-gravity system is challenging to explore. To take first steps towards unco... |
0705.3619 | Dr. Anirudh Pradhan | Anirudh Pradhan, A. K. Yadav, R. P. Singh and V. K. Singh | A New Class of Inhomogeneous String Cosmological Models in General
Relativity | 12 pages, no figure. Submitted to Astrophys. Space Sci. arXiv admin
note: substantial text overlap with arXiv:0705.0904 | Astrophys.SpaceSci.312:145-150,2007 | 10.1007/s10509-007-9665-7 | null | gr-qc | null | A new class of solutions of Einstein field equations has been investigated
for inhomogeneous cylindrically symmetric space-time with string source. To get
the deterministic solution, it has been assumed that the expansion ($\theta$)
in the model is proportional to the eigen value $\sigma^{1}_{1}$ of the shear
tensor ... | [
{
"created": "Thu, 24 May 2007 16:34:46 GMT",
"version": "v1"
}
] | 2014-05-06 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Yadav",
"A. K.",
""
],
[
"Singh",
"R. P.",
""
],
[
"Singh",
"V. K.",
""
]
] | A new class of solutions of Einstein field equations has been investigated for inhomogeneous cylindrically symmetric space-time with string source. To get the deterministic solution, it has been assumed that the expansion ($\theta$) in the model is proportional to the eigen value $\sigma^{1}_{1}$ of the shear tensor $\... |
1811.09582 | John Klauder | John R. Klauder | Building a Genuine Quantum Gravity | 18 pages, minor corrections, offers an affine quantization of gravity
using general relativity | null | null | null | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An affine quantization approach leads to a genuine quantum theory of general
relativity by extracting insights from a short list of increasingly more
complex, soluble, perturbably nonrenormalizable models.
| [
{
"created": "Tue, 20 Nov 2018 20:25:58 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2018 21:45:06 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Mar 2019 15:05:41 GMT",
"version": "v3"
}
] | 2019-03-27 | [
[
"Klauder",
"John R.",
""
]
] | An affine quantization approach leads to a genuine quantum theory of general relativity by extracting insights from a short list of increasingly more complex, soluble, perturbably nonrenormalizable models. |
1408.3978 | Gianluca Gemme | F. Acernese, M. Agathos, K. Agatsuma, D. Aisa, N. Allemandou, A.
Allocca, J. Amarni, P. Astone, G. Balestri, G. Ballardin, F. Barone, J.-P.
Baronick, M. Barsuglia, A. Basti, F. Basti, Th. S. Bauer, V. Bavigadda, M.
Bejger, M. G. Beker, C. Belczynski, D. Bersanetti, A. Bertolini, M. Bitossi,
M. A. Bizouard, S. B... | Advanced Virgo: a 2nd generation interferometric gravitational wave
detector | Submitted to Classical and Quantum Gravity. 55 pages, 29 figures | Class. Quantum Grav. 32 (2015) 024001 | 10.1088/0264-9381/32/2/024001 | null | gr-qc physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Advanced Virgo is the project to upgrade the Virgo interferometric detector
of gravitational waves, with the aim of increasing the number of observable
galaxies (and thus the detection rate) by three orders of magnitude. The
project is now in an advanced construction phase and the assembly and
integration will be com... | [
{
"created": "Mon, 18 Aug 2014 11:19:22 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Sep 2014 14:53:13 GMT",
"version": "v2"
},
{
"created": "Thu, 16 Oct 2014 13:24:29 GMT",
"version": "v3"
}
] | 2014-12-23 | [
[
"Acernese",
"F.",
""
],
[
"Agathos",
"M.",
""
],
[
"Agatsuma",
"K.",
""
],
[
"Aisa",
"D.",
""
],
[
"Allemandou",
"N.",
""
],
[
"Allocca",
"A.",
""
],
[
"Amarni",
"J.",
""
],
[
"Astone",
"P.",
... | Advanced Virgo is the project to upgrade the Virgo interferometric detector of gravitational waves, with the aim of increasing the number of observable galaxies (and thus the detection rate) by three orders of magnitude. The project is now in an advanced construction phase and the assembly and integration will be compl... |
0911.0973 | Wolfgang Tichy | Wolfgang Tichy | Long term black hole evolution with the BSSN system by pseudospectral
methods | 10 pages, 15 figures. Corrected typos | Phys.Rev.D80:104034,2009 | 10.1103/PhysRevD.80.104034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present long term evolutions of a single black hole of mass $M$ with the
BSSN system using pseudospectral methods. For our simulations we use the SGRID
code where the BSSN system is implemented in its standard second order in space
form. Previously we found that such simulations are quite unstable. The main
goal o... | [
{
"created": "Thu, 5 Nov 2009 04:50:49 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Nov 2009 16:48:27 GMT",
"version": "v2"
}
] | 2010-05-25 | [
[
"Tichy",
"Wolfgang",
""
]
] | We present long term evolutions of a single black hole of mass $M$ with the BSSN system using pseudospectral methods. For our simulations we use the SGRID code where the BSSN system is implemented in its standard second order in space form. Previously we found that such simulations are quite unstable. The main goal of ... |
2406.07943 | Pujian Mao | Pujian Mao and Baijun Zeng | Supertranslation ambiguity in post-Minkowskian expansion | v2: interpretations improved, refs. added | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The supertranslation ambiguity of angular momentum is a long-standing problem
in general relativity. In the context of post-Minkowskian expansion, the
supertranslation ambiguity arises the puzzle of the angular momentum loss to
start at ${\cal O}(G^2)$ or at ${\cal O}(G^3)$ in gravitational scattering. In
this paper,... | [
{
"created": "Wed, 12 Jun 2024 07:04:16 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2024 08:20:47 GMT",
"version": "v2"
}
] | 2024-06-24 | [
[
"Mao",
"Pujian",
""
],
[
"Zeng",
"Baijun",
""
]
] | The supertranslation ambiguity of angular momentum is a long-standing problem in general relativity. In the context of post-Minkowskian expansion, the supertranslation ambiguity arises the puzzle of the angular momentum loss to start at ${\cal O}(G^2)$ or at ${\cal O}(G^3)$ in gravitational scattering. In this paper, w... |
gr-qc/9809044 | Robert C. Myers | R.C. Myers | Wavy Horizons? | 12 pages, Based on a talk at the 7th CCGRRA meeting (May 31 - June 7,
1997) | null | null | McGill/97-27 | gr-qc | null | We describe the application of a gravity wave-generating technique to certain
higher dimensional black holes. We find that the induced waves generically
destroy the event horizon producing parallelly propagated curvature
singularities.
| [
{
"created": "Mon, 14 Sep 1998 22:17:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Myers",
"R. C.",
""
]
] | We describe the application of a gravity wave-generating technique to certain higher dimensional black holes. We find that the induced waves generically destroy the event horizon producing parallelly propagated curvature singularities. |
2203.11628 | Marko Toros | Sougato Bose, Anupam Mazumdar, Martine Schut, Marko Toro\v{s} | Entanglement Witness for the Weak Equivalence Principle | 7 pages | Entropy 2023, 25(3), 448 | 10.3390/e25030448 | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | The Einstein equivalence principle is based on the equality of gravitational
mass and inertial mass, which has led to the universality of a free-fall
concept. The principle has been extremely well tested so far and has been
tested with a great precision. However, all these tests and the corresponding
arguments are ba... | [
{
"created": "Tue, 22 Mar 2022 11:29:56 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Mar 2023 11:32:35 GMT",
"version": "v2"
}
] | 2023-03-06 | [
[
"Bose",
"Sougato",
""
],
[
"Mazumdar",
"Anupam",
""
],
[
"Schut",
"Martine",
""
],
[
"Toroš",
"Marko",
""
]
] | The Einstein equivalence principle is based on the equality of gravitational mass and inertial mass, which has led to the universality of a free-fall concept. The principle has been extremely well tested so far and has been tested with a great precision. However, all these tests and the corresponding arguments are base... |
1605.07377 | Wonwoo Lee | Sunly Khimphun, Bum-Hoon Lee, Wonwoo Lee | Phase transition for black holes in dilatonic Einstein-Gauss-Bonnet
theory of gravitation | 24 pages, 8 figures, errors corrected, references added, version
published in PRD | Phys.Rev. D94 (2016) no.10, 104067 | 10.1103/PhysRevD.94.104067 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the thermodynamic properties of a black hole and the Hawking-Page
phase transition in the asymptotically anti--de Sitter spacetime in the
dilatonic Einstein-Gauss-Bonnet theory of gravitation. We show how the
higher-order curvature terms can influence both the thermodynamic properties
and the phase transitio... | [
{
"created": "Tue, 24 May 2016 11:14:51 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2016 13:34:43 GMT",
"version": "v2"
}
] | 2016-11-30 | [
[
"Khimphun",
"Sunly",
""
],
[
"Lee",
"Bum-Hoon",
""
],
[
"Lee",
"Wonwoo",
""
]
] | We study the thermodynamic properties of a black hole and the Hawking-Page phase transition in the asymptotically anti--de Sitter spacetime in the dilatonic Einstein-Gauss-Bonnet theory of gravitation. We show how the higher-order curvature terms can influence both the thermodynamic properties and the phase transition.... |
1209.4807 | Janusz Garecki Prof | Janusz Garecki | Canonical superenergy tensors in general relativity: a reappraisal | 6 pages, REVTEX 4, no figures, lecture delivered at the conference
"100 years after Einstein in Prague" | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we present our actual point of view on the canonical superenergy
tensors.
| [
{
"created": "Fri, 21 Sep 2012 12:56:12 GMT",
"version": "v1"
}
] | 2012-09-24 | [
[
"Garecki",
"Janusz",
""
]
] | Here we present our actual point of view on the canonical superenergy tensors. |
1611.07496 | Reyhan Kaya | H.T. \"Oz\c{c}elik, R. Kaya, M. Horta\c{c}su | Einstein gravity with torsion induced by the scalar field | 12 pages, 7 figures | Annals of Physics, 393:132-144 (2018) | 10.1016/j.aop.2018.04.012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We couple a conformal scalar field in (2+1) dimensions to Einstein gravity
with torsion. The field equations are obtained by a variational principle. We
could not solve the Einstein and Cartan equations analytically. These equations
are solved numerically with 4th order Runge-Kutta method. From the numerical
solution... | [
{
"created": "Tue, 22 Nov 2016 20:13:07 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Mar 2017 09:17:20 GMT",
"version": "v2"
},
{
"created": "Fri, 25 May 2018 07:16:46 GMT",
"version": "v3"
}
] | 2018-06-06 | [
[
"Özçelik",
"H. T.",
""
],
[
"Kaya",
"R.",
""
],
[
"Hortaçsu",
"M.",
""
]
] | We couple a conformal scalar field in (2+1) dimensions to Einstein gravity with torsion. The field equations are obtained by a variational principle. We could not solve the Einstein and Cartan equations analytically. These equations are solved numerically with 4th order Runge-Kutta method. From the numerical solution, ... |
2404.05028 | Luis A. Sanchez | Luis A. S\'anchez | Quantum gravity modifications to the accretion onto a Kerr black hole | 15 pages, 18 figures, 4 tables, typos corrected, references added,
matches published version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of the Asymptotic Safety scenario for quantum gravity, we
analyze quantum gravity modifications to the thermal characteristics of a thin
accretion disk spiraling around a renormalization group improved (RGI-) Kerr
black hole in the low energy regime. We focused on the quantum effects on the
location ... | [
{
"created": "Sun, 7 Apr 2024 17:47:02 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jun 2024 12:39:59 GMT",
"version": "v2"
}
] | 2024-07-01 | [
[
"Sánchez",
"Luis A.",
""
]
] | In the framework of the Asymptotic Safety scenario for quantum gravity, we analyze quantum gravity modifications to the thermal characteristics of a thin accretion disk spiraling around a renormalization group improved (RGI-) Kerr black hole in the low energy regime. We focused on the quantum effects on the location of... |
gr-qc/0504038 | Sean A. Hayward | Sean A. Hayward | The disinformation problem for black holes (pop version) | 6 revtex4 pages | null | null | null | gr-qc | null | The supposed information paradox for black holes is based on the fundamental
misunderstanding that black holes are usefully defined by event horizons.
Understood in terms of locally defined trapping horizons, the paradox
disappears: information will escape from an evaporating black hole. According
to classical proper... | [
{
"created": "Fri, 8 Apr 2005 18:22:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hayward",
"Sean A.",
""
]
] | The supposed information paradox for black holes is based on the fundamental misunderstanding that black holes are usefully defined by event horizons. Understood in terms of locally defined trapping horizons, the paradox disappears: information will escape from an evaporating black hole. According to classical properti... |
2312.02760 | Maciej Maliborski | Filip Ficek and Maciej Maliborski | Dynamics of nonlinear scalar field with Robin boundary condition on the
Schwarzschild--Anti-de Sitter background | 31 pages, 26 figures | null | null | null | gr-qc hep-th math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work concerns the dynamics of conformal cubic scalar field on a
Schwarzschild--anti-de Sitter background. The main focus is on understanding
how it depends on the size of the black hole and the Robin boundary condition.
We identify a critical curve in the parameter space that separates regions with
distinct asym... | [
{
"created": "Tue, 5 Dec 2023 13:40:18 GMT",
"version": "v1"
}
] | 2023-12-06 | [
[
"Ficek",
"Filip",
""
],
[
"Maliborski",
"Maciej",
""
]
] | This work concerns the dynamics of conformal cubic scalar field on a Schwarzschild--anti-de Sitter background. The main focus is on understanding how it depends on the size of the black hole and the Robin boundary condition. We identify a critical curve in the parameter space that separates regions with distinct asympt... |
gr-qc/0212018 | Emam | Gamal G.L. Nashed | General Spherically Symmetric Non Singular Black Hole Solutions in
Teleparallel Theory of Gravitation | null | Phys.Rev. D66 (2002) 064015 | 10.1103/PhysRevD.66.064015 | null | gr-qc | null | We find the most general spherically symmetric non singular black hole
solution in a special class of teleparallel theory of gravitation. If $r$ is
large enough, the general solution coincides with the Schwarzschild solution.
Whereas, if $r$ is small, the general solution behaves in a manner similar to
that of de Sit... | [
{
"created": "Wed, 4 Dec 2002 09:12:25 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Nashed",
"Gamal G. L.",
""
]
] | We find the most general spherically symmetric non singular black hole solution in a special class of teleparallel theory of gravitation. If $r$ is large enough, the general solution coincides with the Schwarzschild solution. Whereas, if $r$ is small, the general solution behaves in a manner similar to that of de Sitte... |
2303.09492 | Grigoris Panotopoulos | G. Panotopoulos, G. Barnert, L. E. Campusano | Correlation of structure growth index with current cosmic acceleration:
constraints on dark energy models | 13 pages, 3 figures, to be published in IJMPD | null | 10.1142/S0218271823500360 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study dynamical dark energy models within Einstein's theory by means of
matter perturbations and the growth index $\gamma$. Within four-dimensional
General Relativity, we assume that dark energy does not cluster, and we adopt a
linear ansatz for the growth index to investigate its impact on the
deceleration parame... | [
{
"created": "Thu, 16 Mar 2023 17:12:58 GMT",
"version": "v1"
}
] | 2023-06-07 | [
[
"Panotopoulos",
"G.",
""
],
[
"Barnert",
"G.",
""
],
[
"Campusano",
"L. E.",
""
]
] | We study dynamical dark energy models within Einstein's theory by means of matter perturbations and the growth index $\gamma$. Within four-dimensional General Relativity, we assume that dark energy does not cluster, and we adopt a linear ansatz for the growth index to investigate its impact on the deceleration paramete... |
1306.1835 | Paolo Pani | Paolo Pani, Thomas P. Sotiriou, Daniele Vernieri | Gravity with Auxiliary Fields | 5 pages, no figures; v2: clarifications and minor improvements,
matches published version | Phys. Rev. D 88, 121502 (2013) | 10.1103/PhysRevD.88.121502 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modifications of General Relativity usually include extra dynamical degrees
of freedom, which to date remain undetected. Here we explore the possibility of
modifying Einstein's theory by adding solely nondynamical fields. With the
minimal requirement that the theory satisfies the weak equivalence principle
and admits... | [
{
"created": "Fri, 7 Jun 2013 20:00:11 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Jan 2014 17:18:40 GMT",
"version": "v2"
}
] | 2014-01-07 | [
[
"Pani",
"Paolo",
""
],
[
"Sotiriou",
"Thomas P.",
""
],
[
"Vernieri",
"Daniele",
""
]
] | Modifications of General Relativity usually include extra dynamical degrees of freedom, which to date remain undetected. Here we explore the possibility of modifying Einstein's theory by adding solely nondynamical fields. With the minimal requirement that the theory satisfies the weak equivalence principle and admits a... |
1112.4918 | Isabeau Pr\'emont-Schwarz | Isabeau Pr\'emont-Schwarz | Local tuning of Coupling Constants allows for Quantum Fields in Curved
Spacetime in the Lab | 11 pages | null | null | null | gr-qc cond-mat.mes-hall cond-mat.mtrl-sci | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we will investigate how one can create emergent curved
spacetimes by locally tuning the coupling constants of condensed matter
systems. In the continuum limit we thus obtain continuous effective quantum
fields living on curved spacetimes. In particular, using Stingnet condensates
we can obtain effective... | [
{
"created": "Wed, 21 Dec 2011 03:28:55 GMT",
"version": "v1"
}
] | 2011-12-22 | [
[
"Prémont-Schwarz",
"Isabeau",
""
]
] | In this paper we will investigate how one can create emergent curved spacetimes by locally tuning the coupling constants of condensed matter systems. In the continuum limit we thus obtain continuous effective quantum fields living on curved spacetimes. In particular, using Stingnet condensates we can obtain effective e... |
1412.6015 | Simone Speziale | Tommaso De Lorenzo, Costantino Pacilio, Carlo Rovelli and Simone
Speziale | On the Effective Metric of a Planck Star | 10 pages, many figures; v2 added references | General Relativity and Gravitation (2015), Volume 47 | 10.1007/s10714-015-1882-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spacetime metrics describing `non-singular' black holes are commonly studied
in the literature as effective modification to the Schwarzschild solution that
mimic quantum gravity effects removing the central singularity. Here we point
out that to be physically plausible, such metrics should also incorporate the
1-loop... | [
{
"created": "Thu, 18 Dec 2014 19:23:02 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Mar 2015 23:09:26 GMT",
"version": "v2"
}
] | 2015-03-25 | [
[
"De Lorenzo",
"Tommaso",
""
],
[
"Pacilio",
"Costantino",
""
],
[
"Rovelli",
"Carlo",
""
],
[
"Speziale",
"Simone",
""
]
] | Spacetime metrics describing `non-singular' black holes are commonly studied in the literature as effective modification to the Schwarzschild solution that mimic quantum gravity effects removing the central singularity. Here we point out that to be physically plausible, such metrics should also incorporate the 1-loop q... |
gr-qc/0404080 | Masafumi Seriu | Masafumi Seriu | Dynamical Evolution of a Cylindrical Shell with Rotational Pressure | To appear in Phys. Rev. D | Phys.Rev. D69 (2004) 124030 | 10.1103/PhysRevD.69.124030 | null | gr-qc | null | We prepare a general framework for analyzing the dynamics of a cylindrical
shell in the spacetime with cylindrical symmetry. Based on the framework, we
investigate a particular model of a cylindrical shell-collapse with rotational
pressure, accompanying the radiation of gravitational waves and massless
particles. The... | [
{
"created": "Sat, 17 Apr 2004 14:26:02 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Seriu",
"Masafumi",
""
]
] | We prepare a general framework for analyzing the dynamics of a cylindrical shell in the spacetime with cylindrical symmetry. Based on the framework, we investigate a particular model of a cylindrical shell-collapse with rotational pressure, accompanying the radiation of gravitational waves and massless particles. The m... |
1301.2209 | Gonzalo Olmo | S. Capozziello, T. Harko, T. S. Koivisto, Francisco S. N. Lobo,
Gonzalo J. Olmo | Hybrid f(R) theories, local constraints, and cosmic speedup | 3 pages, no figures, proceedings of 13th Marcel Grossmann Meeting | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an extension of general relativity in which an $f(R)$ term \`{a}
la Palatini is added to the usual metric Einstein-Hilbert Lagrangian.
Expressing the theory in a dynamically equivalent scalar-tensor form, we show
that it can pass the Solar System observational tests even if the scalar field
is very light o... | [
{
"created": "Thu, 10 Jan 2013 18:26:35 GMT",
"version": "v1"
}
] | 2013-01-11 | [
[
"Capozziello",
"S.",
""
],
[
"Harko",
"T.",
""
],
[
"Koivisto",
"T. S.",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Olmo",
"Gonzalo J.",
""
]
] | We present an extension of general relativity in which an $f(R)$ term \`{a} la Palatini is added to the usual metric Einstein-Hilbert Lagrangian. Expressing the theory in a dynamically equivalent scalar-tensor form, we show that it can pass the Solar System observational tests even if the scalar field is very light or ... |
2212.01404 | Mostafizur Rahman | Mostafizur Rahman, Shailesh Kumar and Arpan Bhattacharyya | Gravitational wave from extreme mass-ratio inspirals as a probe of extra
dimensions | 27 pages, 5 figures, 2 tables, typos corrected | JCAP 01 (2023) 046 | 10.1088/1475-7516/2023/01/046 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The field of gravitational waves is rapidly progressing due to the noticeable
advancements in the sensitivity of gravitational-wave detectors that has
enabled the detection prospects of binary black hole mergers. Extreme mass
ratio inspiral (EMRI) is one of the most compelling and captivating binary
systems in this d... | [
{
"created": "Fri, 2 Dec 2022 19:00:23 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Dec 2022 14:55:04 GMT",
"version": "v2"
}
] | 2023-02-01 | [
[
"Rahman",
"Mostafizur",
""
],
[
"Kumar",
"Shailesh",
""
],
[
"Bhattacharyya",
"Arpan",
""
]
] | The field of gravitational waves is rapidly progressing due to the noticeable advancements in the sensitivity of gravitational-wave detectors that has enabled the detection prospects of binary black hole mergers. Extreme mass ratio inspiral (EMRI) is one of the most compelling and captivating binary systems in this dir... |
1912.06839 | Ion I. Cotaescu | Ion I. Cotaescu | Rest frame vacua of massive Klein-Gordon fields on spatially flat FLRW
spacetimes | 23 pages, 3 figures | null | 10.1140/epjc/s10052-020-8170-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a method of projecting the quantum states from a state space of a
given geometry into another state space generated by a different geometry,
taking care on the correct normalization which is crucial in interpreting the
quantum theory. Thanks to this method we can define on any spatially flat FLRW
spacetime... | [
{
"created": "Sat, 14 Dec 2019 13:12:23 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Dec 2019 13:36:14 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Dec 2019 10:02:11 GMT",
"version": "v3"
},
{
"created": "Sun, 26 Jan 2020 19:44:27 GMT",
"version": "v4"
},
{
"c... | 2020-08-26 | [
[
"Cotaescu",
"Ion I.",
""
]
] | We propose a method of projecting the quantum states from a state space of a given geometry into another state space generated by a different geometry, taking care on the correct normalization which is crucial in interpreting the quantum theory. Thanks to this method we can define on any spatially flat FLRW spacetime s... |
1805.09629 | Prado Martin-Moruno | Jose A. R. Cembranos, Mario Coma Diaz, Prado Martin-Moruno | Modified gravity as a diagravitational medium | V1: 5 pages. Comments welcome. V2: 4 references added. V3: additional
comments included, 4 references added. Version accepted for publication in
Physics Letters B | null | 10.1016/j.physletb.2018.10.068 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we reflect on the propagation of gravitational waves in
alternative theories of gravity, which are typically formulated using extra
gravitational degrees of freedom in comparison to General Relativity. We
propose to understand that additional structure as forming a diagravitational
medium for gravitati... | [
{
"created": "Thu, 24 May 2018 12:19:50 GMT",
"version": "v1"
},
{
"created": "Mon, 28 May 2018 11:08:36 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Oct 2018 11:26:15 GMT",
"version": "v3"
}
] | 2018-11-28 | [
[
"Cembranos",
"Jose A. R.",
""
],
[
"Diaz",
"Mario Coma",
""
],
[
"Martin-Moruno",
"Prado",
""
]
] | In this letter we reflect on the propagation of gravitational waves in alternative theories of gravity, which are typically formulated using extra gravitational degrees of freedom in comparison to General Relativity. We propose to understand that additional structure as forming a diagravitational medium for gravitation... |
1707.00479 | Tommaso De Lorenzo | Tommaso De Lorenzo and Alejandro Perez | Light Cone Thermodynamics | 30 pages, 5 pictures; V_2: a problem in the proof of the first law
has been corrected. Results remain unchanged. Geometric interpretation and
presentation improved; V_3: matches published version | Phys. Rev. D 97, 044052 (2018) | 10.1103/PhysRevD.97.044052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that null surfaces defined by the outgoing and infalling wave fronts
emanating from and arriving at a sphere in Minkowski spacetime have
thermodynamical properties that are in strict formal correspondence with those
of black hole horizons in curved spacetimes. Such null surfaces, made of pieces
of light cones... | [
{
"created": "Mon, 3 Jul 2017 11:00:11 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Nov 2017 14:23:58 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Mar 2018 14:38:27 GMT",
"version": "v3"
}
] | 2018-03-07 | [
[
"De Lorenzo",
"Tommaso",
""
],
[
"Perez",
"Alejandro",
""
]
] | We show that null surfaces defined by the outgoing and infalling wave fronts emanating from and arriving at a sphere in Minkowski spacetime have thermodynamical properties that are in strict formal correspondence with those of black hole horizons in curved spacetimes. Such null surfaces, made of pieces of light cones, ... |
gr-qc/9511010 | Steve F. Rippl | Steve Rippl, Henk van Elst, Reza Tavakol and David Taylor | Kinematics and Dynamics of $f(R)$ Theories of Gravity | 13 pages, latex, to appear in GRG | Gen.Rel.Grav. 28 (1996) 193-205 | 10.1007/BF02105423 | null | gr-qc | null | We generalise the equations governing relativistic fluid dynamics given by
Ehlers and Ellis for general relativity, and by Maartens and Taylor for
quadratic theories, to generalised $f(R)$ theories of gravity. In view of the
usefulness of this alternative framework to general relativity, its
generalisation can be of ... | [
{
"created": "Thu, 2 Nov 1995 14:23:51 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Rippl",
"Steve",
""
],
[
"van Elst",
"Henk",
""
],
[
"Tavakol",
"Reza",
""
],
[
"Taylor",
"David",
""
]
] | We generalise the equations governing relativistic fluid dynamics given by Ehlers and Ellis for general relativity, and by Maartens and Taylor for quadratic theories, to generalised $f(R)$ theories of gravity. In view of the usefulness of this alternative framework to general relativity, its generalisation can be of po... |
1609.06185 | Hossein Mohseni Sadjadi | Parviz Goodarzi and H. Mohseni Sadjadi | Warm inflation with an oscillatory inflaton in the non-minimal kinetic
coupling model | 22 pages, typos fixed, accepted by EPJC | Eur.Phys.J. C 77 (2017) 463 | 10.1140/epjc/s10052-017-5028-x | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the cold inflation scenario, the slow roll inflation and reheating via
coherent rapid oscillation, are usually considered as two distinct eras. When
the slow roll ends, a rapid oscillation phase begins and the inflaton decays to
relativistic particles reheating the Universe. In another model dubbed warm
inflation,... | [
{
"created": "Sun, 18 Sep 2016 08:46:17 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Jan 2017 12:35:10 GMT",
"version": "v2"
},
{
"created": "Sun, 18 Jun 2017 05:57:21 GMT",
"version": "v3"
},
{
"created": "Mon, 17 Jul 2017 08:50:40 GMT",
"version": "v4"
}
] | 2017-07-18 | [
[
"Goodarzi",
"Parviz",
""
],
[
"Sadjadi",
"H. Mohseni",
""
]
] | In the cold inflation scenario, the slow roll inflation and reheating via coherent rapid oscillation, are usually considered as two distinct eras. When the slow roll ends, a rapid oscillation phase begins and the inflaton decays to relativistic particles reheating the Universe. In another model dubbed warm inflation, t... |
0708.0680 | Saibal Ray | U. Mukhopadhyay, Saibal Ray and S. B. Dutta Choudhury | $\Lambda$-CDM Universe: A Phenomenological Approach With Many
Possibilities | 10 Latex pages; Corrected typos; To appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys.D17:301-309,2008 | 10.1142/S0218271808012012 | null | gr-qc | null | A time-dependent phenomenological model of $\Lambda$, viz. $\dot \Lambda\sim
H^3$ is selected to investigate the $\Lambda$-CDM cosmology. Time-dependent
form of the equation of state parameter $\omega$ is derived and it has been
possible to obtain the sought for flip of sign of the deceleration parameter q.
Present a... | [
{
"created": "Sun, 5 Aug 2007 18:03:45 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Mar 2008 17:49:47 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Mukhopadhyay",
"U.",
""
],
[
"Ray",
"Saibal",
""
],
[
"Choudhury",
"S. B. Dutta",
""
]
] | A time-dependent phenomenological model of $\Lambda$, viz. $\dot \Lambda\sim H^3$ is selected to investigate the $\Lambda$-CDM cosmology. Time-dependent form of the equation of state parameter $\omega$ is derived and it has been possible to obtain the sought for flip of sign of the deceleration parameter q. Present age... |
1303.3662 | Feng He | Long Huang, Feng He, Hai Huang, Min Yao | The Gravitational Deflection of Light in F(R)-gravity | null | null | 10.1007/s10773-014-2000-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fact that the gravitation could deflect the light trajectory has been
confirmed by a large number of observation data, that is consistent with the
result calculated by Einstein's gravity. F(R)-gravity is the modification of
Einstein's gravity. According to the field equations obtained by the action of
the f(R) fo... | [
{
"created": "Fri, 15 Mar 2013 02:21:15 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Huang",
"Long",
""
],
[
"He",
"Feng",
""
],
[
"Huang",
"Hai",
""
],
[
"Yao",
"Min",
""
]
] | The fact that the gravitation could deflect the light trajectory has been confirmed by a large number of observation data, that is consistent with the result calculated by Einstein's gravity. F(R)-gravity is the modification of Einstein's gravity. According to the field equations obtained by the action of the f(R) form... |
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