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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1505.05550 | Anamar\'ia Navarro | Guillermo A. Gonz\'alez, Anamar\'ia Navarro and Luis A. N\'u\~nez | Cracking in charged relativistic spheres | 14 pages, 6 eps figures | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the concept of cracking, we have explored the influence of density
fluctuations on isotropic and anisotropic charged matter configurations in
General Relativity with "barotropic" equations of state, $P = P(\rho)$ and
$P_{\perp}= P_{\perp}(\rho)$ and a mass-charge relation $Q=Q(\rho)$. We have
refined the idea t... | [
{
"created": "Wed, 20 May 2015 23:08:16 GMT",
"version": "v1"
}
] | 2015-05-22 | [
[
"González",
"Guillermo A.",
""
],
[
"Navarro",
"Anamaría",
""
],
[
"Núñez",
"Luis A.",
""
]
] | Using the concept of cracking, we have explored the influence of density fluctuations on isotropic and anisotropic charged matter configurations in General Relativity with "barotropic" equations of state, $P = P(\rho)$ and $P_{\perp}= P_{\perp}(\rho)$ and a mass-charge relation $Q=Q(\rho)$. We have refined the idea tha... |
1508.07874 | Tomislav Prokopec | Tomislav Prokopec (Utrecht) | Late time solution for interacting scalar in accelerating spaces | 13 pages | null | 10.1088/1475-7516/2015/11/016 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider stochastic inflation in an interacting scalar field in spatially
homogeneous accelerating space-times with a constant principal slow roll
parameter $\epsilon$. We show that, if the scalar potential is scale invariant
(which is the case when scalar contains quartic self-interaction and couples
non-minimall... | [
{
"created": "Mon, 31 Aug 2015 15:40:03 GMT",
"version": "v1"
}
] | 2015-11-18 | [
[
"Prokopec",
"Tomislav",
"",
"Utrecht"
]
] | We consider stochastic inflation in an interacting scalar field in spatially homogeneous accelerating space-times with a constant principal slow roll parameter $\epsilon$. We show that, if the scalar potential is scale invariant (which is the case when scalar contains quartic self-interaction and couples non-minimally ... |
1601.04519 | Iver Brevik | Ben David Normann and Iver Brevik | General Bulk-Viscous Solutions and Estimates of Bulk Viscosity in the
Cosmic Fluid | 15 pages, one figure. Major revision of the manuscript; new title.
Version to appear in Entropy | Entropy, Vol. 18, article 215 (2016) | 10.3390/e18060215 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a general formalism for bulk viscous solutions of the
energy-conservation-equation for $\rho(a,\zeta)$, both for a single-component
and a multicomponent fluid in the Friedmann universe. For our purposes these
general solutions become valuable in estimating order of magnitude of the
phenomenological viscosit... | [
{
"created": "Mon, 18 Jan 2016 14:01:27 GMT",
"version": "v1"
},
{
"created": "Fri, 27 May 2016 08:05:00 GMT",
"version": "v2"
}
] | 2016-06-03 | [
[
"Normann",
"Ben David",
""
],
[
"Brevik",
"Iver",
""
]
] | We derive a general formalism for bulk viscous solutions of the energy-conservation-equation for $\rho(a,\zeta)$, both for a single-component and a multicomponent fluid in the Friedmann universe. For our purposes these general solutions become valuable in estimating order of magnitude of the phenomenological viscosity ... |
1808.09749 | Reetika Dudi | Reetika Dudi, Francesco Pannarale, Tim Dietrich, Mark Hannam,
Sebastiano Bernuzzi, Frank Ohme, Bernd Bruegmann | Relevance of tidal effects and post-merger dynamics for binary neutron
star parameter estimation | null | Phys. Rev. D 98, 084061 (2018) | 10.1103/PhysRevD.98.084061 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Measurements of the properties of binary neutron star systems from
gravitational-wave observations require accurate theoretical models for such
signals. However, current models are incomplete, as they do not take into
account all of the physics of these systems: some neglect possible tidal
effects, others neglect spi... | [
{
"created": "Wed, 29 Aug 2018 12:13:53 GMT",
"version": "v1"
}
] | 2018-11-07 | [
[
"Dudi",
"Reetika",
""
],
[
"Pannarale",
"Francesco",
""
],
[
"Dietrich",
"Tim",
""
],
[
"Hannam",
"Mark",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Ohme",
"Frank",
""
],
[
"Bruegmann",
"Bernd",
""
]
] | Measurements of the properties of binary neutron star systems from gravitational-wave observations require accurate theoretical models for such signals. However, current models are incomplete, as they do not take into account all of the physics of these systems: some neglect possible tidal effects, others neglect spin-... |
2309.01794 | Kirill Bronnikov | Kirill A. Bronnikov, Sergei V. Bolokhov, Milena V. Skvortsova, Kodir
Badalov, Rustam Ibadov | On the stability of spherically symmetric space-times in scalar-tensor
gravity | 16 pages, 4 figures, each of 2 parts. Minor corrections, matching to
the journal version | Grav. Cosmol. 29 (4), 374-386 (2023) | 10.1134/S0202289323040059 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the linear stability of vacuum static, spherically symmetric
solutions to the gravitational field equations of the
Bergmann-Wagoner-Nordtvedt class of scalar-tensor theories (STT) of gravity,
restricting ourselves to nonphantom theories, massless scalar fields and
configurations with positive Schwarzschild m... | [
{
"created": "Mon, 4 Sep 2023 20:10:58 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Nov 2023 11:06:12 GMT",
"version": "v2"
}
] | 2023-11-14 | [
[
"Bronnikov",
"Kirill A.",
""
],
[
"Bolokhov",
"Sergei V.",
""
],
[
"Skvortsova",
"Milena V.",
""
],
[
"Badalov",
"Kodir",
""
],
[
"Ibadov",
"Rustam",
""
]
] | We study the linear stability of vacuum static, spherically symmetric solutions to the gravitational field equations of the Bergmann-Wagoner-Nordtvedt class of scalar-tensor theories (STT) of gravity, restricting ourselves to nonphantom theories, massless scalar fields and configurations with positive Schwarzschild mas... |
gr-qc/9911074 | caroline dos santos | Caroline Santos | Dilatonic String through black holes | Poster. 5 pages in Portuguese. Published in Actas VIII National
Meeting in Astronomy and Astrophysics, IST - Porto, 1998 | null | null | null | gr-qc | null | We study the gravi-dilaton field of a Schwarzschild black hole pierced by a
thin cosmic string in both massless and massive dilatonic gravity. We conclude
that in the thin vortex approximation the string's spacetime is asymptotically
flat with a conical deficit angle and that the inertial mass of the black hole
is di... | [
{
"created": "Fri, 19 Nov 1999 17:14:04 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Santos",
"Caroline",
""
]
] | We study the gravi-dilaton field of a Schwarzschild black hole pierced by a thin cosmic string in both massless and massive dilatonic gravity. We conclude that in the thin vortex approximation the string's spacetime is asymptotically flat with a conical deficit angle and that the inertial mass of the black hole is diff... |
gr-qc/9903064 | B. Linet | B. Linet | Entropy bound for a charged object from the Kerr-Newman black hole | latex, 4 pages, no figures. In this version, the desired bound is
well obtained by varying correctly the entropy of the black hole | Gen.Rel.Grav. 31 (1999) 1609-1613 | 10.1023/A:1026790606235 | null | gr-qc | null | We derive again the upper entropy bound for a charged object by employing
thermodynamics of the Kerr-Newman black hole linearised with respect to its
electric charge
| [
{
"created": "Wed, 17 Mar 1999 15:18:38 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Mar 1999 13:47:55 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Mar 1999 13:31:44 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Linet",
"B.",
""
]
] | We derive again the upper entropy bound for a charged object by employing thermodynamics of the Kerr-Newman black hole linearised with respect to its electric charge |
1804.03067 | Giovanni Manfredi | Giovanni Manfredi, Jean-Louis Rouet, Bruce Miller, Gabriel Chardin | Cosmological structure formation with negative mass | Equation 14 has been corrected (NB: typo in the published PRD
version) | Phys. Rev. D 98, 023514 (2018) | 10.1103/PhysRevD.98.023514 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a family of models with negative gravitational mass in the
context of Newtonian gravity. We focus in particular on a model that reproduces
the features of the so-called Dirac-Milne universe, a matter-antimatter
symmetric universe that was recently proposed as an alternative cosmological
scenario [A. Beno... | [
{
"created": "Mon, 9 Apr 2018 15:56:32 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jun 2018 15:28:49 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Dec 2018 11:51:07 GMT",
"version": "v3"
}
] | 2018-12-11 | [
[
"Manfredi",
"Giovanni",
""
],
[
"Rouet",
"Jean-Louis",
""
],
[
"Miller",
"Bruce",
""
],
[
"Chardin",
"Gabriel",
""
]
] | We construct a family of models with negative gravitational mass in the context of Newtonian gravity. We focus in particular on a model that reproduces the features of the so-called Dirac-Milne universe, a matter-antimatter symmetric universe that was recently proposed as an alternative cosmological scenario [A. Benoit... |
0704.2736 | Jacques L. Rubin | T. Grandou, J.L. Rubin | Twin Paradox and Causality | 17 pages, no figures, submitted to Am. J. Phys | ECONFC0706044:15,2007 | null | INLN 2006#06 | gr-qc | null | After pointing out the historical avatar at the origin of a would be twin or
clock paradox, we argue that, at least on a local scale, the (re-qualified)
paradox is but a necessary consequence of the sole principle of causality.
| [
{
"created": "Fri, 20 Apr 2007 15:50:12 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Grandou",
"T.",
""
],
[
"Rubin",
"J. L.",
""
]
] | After pointing out the historical avatar at the origin of a would be twin or clock paradox, we argue that, at least on a local scale, the (re-qualified) paradox is but a necessary consequence of the sole principle of causality. |
gr-qc/0410031 | Ujjal Debnath | Ujjal Debnath, Subenoy Chakraborty, Naresh Dadhich | A dynamical symmetry of the spherical dust collapse | 4 pages, no figure, Revtex | null | 10.1142/S021827180500736X | null | gr-qc | null | By linearly scaling the initial data set (mass and kinetic energy functions)
together with the initial area radius of a collapsing dust sphere, we find a
symmetry of the collapse dynamics. That is, the linear transformation defines
an equivalence class of data sets which lead to the same end result as well as
its evo... | [
{
"created": "Thu, 7 Oct 2004 10:23:27 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Debnath",
"Ujjal",
""
],
[
"Chakraborty",
"Subenoy",
""
],
[
"Dadhich",
"Naresh",
""
]
] | By linearly scaling the initial data set (mass and kinetic energy functions) together with the initial area radius of a collapsing dust sphere, we find a symmetry of the collapse dynamics. That is, the linear transformation defines an equivalence class of data sets which lead to the same end result as well as its evolu... |
0810.3172 | Wlodzimierz Piechocki | Piotr Dzierzak, Jacek Jezierski, Przemyslaw Malkiewicz and Wlodzimierz
Piechocki | The minimum length problem of loop quantum cosmology | 9 pages, no figures, revtex4; version published by Acta Physica
Polonica | Acta Phys. Polon. B41:717-726,2010 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The appearance of the big bounce (BB) in the evolution of the universe is
analyzed in the setting of loop quantum cosmology (LQC). Making use of an idea
of a minimum length turns classical Big Bang into BB. We argue why the spectrum
of the kinematical area operator of loop quantum gravity cannot be used for the
deter... | [
{
"created": "Fri, 17 Oct 2008 14:48:51 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Jan 2009 15:07:55 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Mar 2010 16:16:10 GMT",
"version": "v3"
}
] | 2015-03-13 | [
[
"Dzierzak",
"Piotr",
""
],
[
"Jezierski",
"Jacek",
""
],
[
"Malkiewicz",
"Przemyslaw",
""
],
[
"Piechocki",
"Wlodzimierz",
""
]
] | The appearance of the big bounce (BB) in the evolution of the universe is analyzed in the setting of loop quantum cosmology (LQC). Making use of an idea of a minimum length turns classical Big Bang into BB. We argue why the spectrum of the kinematical area operator of loop quantum gravity cannot be used for the determi... |
0909.0895 | Salvatore Capozziello | S. Capozziello, M. De Laurentis, L. Forte, F. Garufi, L. Milano | Gravitomagnetic corrections on gravitational waves | 14 pages, 7 figures | null | 10.1088/0031-8949/81/03/035008 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waveforms and production could be considerably affected by
gravitomagnetic corrections considered in relativistic theory of orbits. Beside
the standard periastron effect of General Relativity, new nutation effects come
out when c^{-3} corrections are taken into account. Such corrections emerge as
soon a... | [
{
"created": "Fri, 4 Sep 2009 12:07:17 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Capozziello",
"S.",
""
],
[
"De Laurentis",
"M.",
""
],
[
"Forte",
"L.",
""
],
[
"Garufi",
"F.",
""
],
[
"Milano",
"L.",
""
]
] | Gravitational waveforms and production could be considerably affected by gravitomagnetic corrections considered in relativistic theory of orbits. Beside the standard periastron effect of General Relativity, new nutation effects come out when c^{-3} corrections are taken into account. Such corrections emerge as soon as ... |
1909.10010 | Chinmay Kalaghatgi Mr. | Chinmay Kalaghatgi, Mark Hannam, Vivien Raymond | Parameter Estimation with a spinning multi-mode waveform model:
IMRPhenomHM | 14 pages, 7 figures | Phys. Rev. D 101, 103004 (2020) | 10.1103/PhysRevD.101.103004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves from compact binary coalescence sources can be decomposed
into spherical-harmonic multipoles, the dominant being the quadrupole ($\ell=2,
m=\pm2$) modes. The contribution of sub-dominant modes towards total signal
power increases with increasing binary mass ratio and source inclination to the
dete... | [
{
"created": "Sun, 22 Sep 2019 14:03:54 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Oct 2019 12:10:48 GMT",
"version": "v2"
}
] | 2020-05-06 | [
[
"Kalaghatgi",
"Chinmay",
""
],
[
"Hannam",
"Mark",
""
],
[
"Raymond",
"Vivien",
""
]
] | Gravitational waves from compact binary coalescence sources can be decomposed into spherical-harmonic multipoles, the dominant being the quadrupole ($\ell=2, m=\pm2$) modes. The contribution of sub-dominant modes towards total signal power increases with increasing binary mass ratio and source inclination to the detect... |
gr-qc/0005024 | Riazuelo | Alain Riazuelo and Nathalie Deruelle | Cosmic microwave background anisotropies seeded by incoherent sources | 11 pages, 1 figure | Annalen Phys. 9 (2000) 288-298 | 10.1002/(SICI)1521-3889(200005)9:3/5<288::AID-ANDP288>3.0.CO;2-M | null | gr-qc | null | The cosmic microwave background anisotropies produced by active seeds, such
as topological defects, have been computed recently for a variety of models by
a number of authors. In this paper we show how the generic features of the
anisotropies caused by active, incoherent, seeds (that is the absence of
acoustic peaks ... | [
{
"created": "Tue, 9 May 2000 08:40:15 GMT",
"version": "v1"
}
] | 2017-10-04 | [
[
"Riazuelo",
"Alain",
""
],
[
"Deruelle",
"Nathalie",
""
]
] | The cosmic microwave background anisotropies produced by active seeds, such as topological defects, have been computed recently for a variety of models by a number of authors. In this paper we show how the generic features of the anisotropies caused by active, incoherent, seeds (that is the absence of acoustic peaks at... |
1101.2141 | Alfredo Sandoval-Villalbazo | J. H. Mondragon Suarez, A. Sandoval-Villalbazo | Jeans instability analysis in the presence of heat in Eckart's frame | 9 pages, no figures | Gen. Relativ. Gravit. (2012) 44:139-145 | 10.1007/s10714-011-1267-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that the coupling of heat with acceleration first proposed by
Eckart would have an overwhelming effect in the growth of density mass
fluctuations, even in non-relativistic fluids in the presence of a
gravitational field. Gravitational effects would be negligible if the
heat-acceleration relation is assume... | [
{
"created": "Tue, 11 Jan 2011 15:08:35 GMT",
"version": "v1"
}
] | 2012-01-30 | [
[
"Suarez",
"J. H. Mondragon",
""
],
[
"Sandoval-Villalbazo",
"A.",
""
]
] | It is shown that the coupling of heat with acceleration first proposed by Eckart would have an overwhelming effect in the growth of density mass fluctuations, even in non-relativistic fluids in the presence of a gravitational field. Gravitational effects would be negligible if the heat-acceleration relation is assumed ... |
gr-qc/0412104 | Kirill Krasnov | Kirill Krasnov | Holography for the Lorentz Group Racah Coefficients | 12 pages, 2 figures; v2: minor changes; v3: "extended" tetrahedron
interpretation added | Class.Quant.Grav. 22 (2005) 1933-1944 | 10.1088/0264-9381/22/11/003 | null | gr-qc hep-th | null | A known realization of the Lorentz group Racah coefficients is given by an
integral of a product of 6 ``propagators'' over 4 copies of the hyperbolic
space. These are ``bulk-to-bulk'' propagators in that they are functions of two
points in the hyperbolic space. It is known that the bulk-to-bulk propagator
can be cons... | [
{
"created": "Tue, 21 Dec 2004 15:28:30 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 2005 11:58:07 GMT",
"version": "v2"
},
{
"created": "Sun, 3 Apr 2005 16:27:42 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Krasnov",
"Kirill",
""
]
] | A known realization of the Lorentz group Racah coefficients is given by an integral of a product of 6 ``propagators'' over 4 copies of the hyperbolic space. These are ``bulk-to-bulk'' propagators in that they are functions of two points in the hyperbolic space. It is known that the bulk-to-bulk propagator can be constr... |
1410.6202 | Stefano Ansoldi | Stefano Ansoldi and Takahiro Tanaka | Tunnelling with wormhole creation | 13 pages; 4 figures | null | 10.1134/S1063776115030139 | KUNS-2524; YITP-14-82 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The description of quantum tunnelling in the presence of gravity shows
subtleties in some cases. Here we discuss wormhole production in the context of
the spherically symmetric thin-shell approximation. By presenting a fully
consistent treatment based on canonical quantization, we solve a controversy
present in liter... | [
{
"created": "Wed, 22 Oct 2014 21:55:00 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Ansoldi",
"Stefano",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | The description of quantum tunnelling in the presence of gravity shows subtleties in some cases. Here we discuss wormhole production in the context of the spherically symmetric thin-shell approximation. By presenting a fully consistent treatment based on canonical quantization, we solve a controversy present in literat... |
1102.0589 | Glenn Barnich | Glenn Barnich and Pierre-Henry Lambert | A note on the Newman-Unti group and the BMS charge algebra in terms of
Newman-Penrose coefficients | v2: 16 pages Latex file, considerably expanded version containing
transformations of fields and surface charge algebra; v3: cosmetic changes,
agrees with published version | Advances in Mathematical Physics, vol. 2012, Article ID 197385,
2012 | 10.1155/2012/197385 | ULB-TH/11-01 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The symmetry algebra of asymptotically flat spacetimes at null infinity in
four dimensions in the sense of Newman and Unti is revisited. As in the
Bondi-Metzner-Sachs gauge, it is shown to be isomorphic to the direct sum of
the abelian algebra of infinitesimal conformal rescalings with bms4. The latter
algebra is the... | [
{
"created": "Wed, 2 Feb 2011 23:59:07 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Oct 2011 17:27:26 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Jan 2013 15:28:21 GMT",
"version": "v3"
}
] | 2013-01-24 | [
[
"Barnich",
"Glenn",
""
],
[
"Lambert",
"Pierre-Henry",
""
]
] | The symmetry algebra of asymptotically flat spacetimes at null infinity in four dimensions in the sense of Newman and Unti is revisited. As in the Bondi-Metzner-Sachs gauge, it is shown to be isomorphic to the direct sum of the abelian algebra of infinitesimal conformal rescalings with bms4. The latter algebra is the s... |
0809.3444 | Martin Reiris | Martin Reiris | The ground state and the long-time evolution in the CMC Einstein flow | 40 pages. This article is an improved version of the second part of
the First Version of arXiv:0705.3070 | Annales Henri Poincare 10:1559-1604,2010 | 10.1007/s00023-010-0027-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Let (g,K)(k) be a CMC (vacuum) Einstein flow over a compact three-manifold M
with non-positive Yamabe invariant (Y(M)). As noted by Fischer and Moncrief,
the reduced volume V(k)=(-k/3)^{3}Vol_{g(k)}(M) is monotonically decreasing in
the expanding direction and bounded below by V_{\inf}=(-1/6)Y(M))^{3/2}.
Inspired by ... | [
{
"created": "Fri, 19 Sep 2008 19:30:23 GMT",
"version": "v1"
}
] | 2010-05-07 | [
[
"Reiris",
"Martin",
""
]
] | Let (g,K)(k) be a CMC (vacuum) Einstein flow over a compact three-manifold M with non-positive Yamabe invariant (Y(M)). As noted by Fischer and Moncrief, the reduced volume V(k)=(-k/3)^{3}Vol_{g(k)}(M) is monotonically decreasing in the expanding direction and bounded below by V_{\inf}=(-1/6)Y(M))^{3/2}. Inspired by th... |
2311.18247 | Konstantin Osetrin | Vladimir Y. Epp and Konstantin E. Osetrin | Induced electromagnetic radiation from a charged cloud in a plane
gravitational wave | 9 pages | Astrophysics, 2024, v.67, N1, p.121-128 | 10.54503/0002-3051-2024.77.1-121 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | For the perturbative model of a plane gravitational wave on a flat background
of Minkowski space-time, electromagnetic radiation from a charged cloud in the
field of a gravitational wave, detected by a remote observer, was found. It is
shown that the charge density in the cloud does not change, and the radiation
is g... | [
{
"created": "Thu, 30 Nov 2023 04:42:28 GMT",
"version": "v1"
}
] | 2024-04-12 | [
[
"Epp",
"Vladimir Y.",
""
],
[
"Osetrin",
"Konstantin E.",
""
]
] | For the perturbative model of a plane gravitational wave on a flat background of Minkowski space-time, electromagnetic radiation from a charged cloud in the field of a gravitational wave, detected by a remote observer, was found. It is shown that the charge density in the cloud does not change, and the radiation is gen... |
1603.05726 | David Radice | David Radice and Sebastiano Bernuzzi and Christian D. Ott | The One-Armed Spiral Instability in Neutron Star Mergers and its
Detectability in Gravitational Waves | 7 pages, 3 figures. Comments are welcome | null | 10.1103/PhysRevD.94.064011 | LIGO-P1600075-v1 and YITP-16-21 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the development and saturation of the $m=1$ one-armed spiral
instability in remnants of binary neutron star mergers by means of
high-resolution long-term numerical relativity simulations. Our results suggest
that this instability is a generic outcome of neutron stars mergers in
astrophysically relevant confi... | [
{
"created": "Thu, 17 Mar 2016 23:30:44 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Sep 2016 19:46:31 GMT",
"version": "v2"
}
] | 2016-09-23 | [
[
"Radice",
"David",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Ott",
"Christian D.",
""
]
] | We study the development and saturation of the $m=1$ one-armed spiral instability in remnants of binary neutron star mergers by means of high-resolution long-term numerical relativity simulations. Our results suggest that this instability is a generic outcome of neutron stars mergers in astrophysically relevant configu... |
2206.13532 | Carlos O. Lousto | Alessandro Ciarfella, James Healy, Carlos O. Lousto, and Hiroyuki
Nakano | Eccentricity estimation from initial data for Numerical Relativity
Simulations | 7 pages, 7 figures, 1 Table | null | 10.1103/PhysRevD.106.104035 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe and study an instantaneous definition of eccentricity to be
applied at the initial moment of full numerical simulations of binary black
holes. The method consists of evaluating the eccentricity at the moment of
maximum separation of the binary. We estimate it using up to third
post-Newtonian (3PN) order, ... | [
{
"created": "Mon, 27 Jun 2022 18:00:02 GMT",
"version": "v1"
}
] | 2022-11-30 | [
[
"Ciarfella",
"Alessandro",
""
],
[
"Healy",
"James",
""
],
[
"Lousto",
"Carlos O.",
""
],
[
"Nakano",
"Hiroyuki",
""
]
] | We describe and study an instantaneous definition of eccentricity to be applied at the initial moment of full numerical simulations of binary black holes. The method consists of evaluating the eccentricity at the moment of maximum separation of the binary. We estimate it using up to third post-Newtonian (3PN) order, an... |
1602.03066 | Behrouz Mirza | Seyed Ali Hosseini Mansoori, Behrouz Mirza, Elham Sharifian | Extrinsic and intrinsic curvatures in thermodynamic geometry | 10 pages, 4 figures | Physics Letters B 759 (2016) 298-305 | 10.1016/j.physletb.2016.05.096 | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the intrinsic and extrinsic curvatures of certain
hypersurfaces in the thermodynamic geometry of a physical system and show that
they contain useful thermodynamic information. For an
anti-Reissner-Nordstr\"{o}m-(A)de Sitter black hole (Phantom), the extrinsic
curvature of a constant $Q$ hypersurface ha... | [
{
"created": "Mon, 8 Feb 2016 15:37:27 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Jun 2016 08:30:11 GMT",
"version": "v2"
}
] | 2016-06-14 | [
[
"Mansoori",
"Seyed Ali Hosseini",
""
],
[
"Mirza",
"Behrouz",
""
],
[
"Sharifian",
"Elham",
""
]
] | We investigate the intrinsic and extrinsic curvatures of certain hypersurfaces in the thermodynamic geometry of a physical system and show that they contain useful thermodynamic information. For an anti-Reissner-Nordstr\"{o}m-(A)de Sitter black hole (Phantom), the extrinsic curvature of a constant $Q$ hypersurface has ... |
gr-qc/0510048 | Sergei Kopeikin | Sergei M. Kopeikin (University of Missouri-Columbia) | Comment on 'Model-dependence of Shapiro time delay and the "speed of
gravity/speed of light" controversy' | 8 pages, no figures, accepted to Classical and Quantum Gravity | Class.Quant.Grav. 22 (2005) 5181-5186 | 10.1088/0264-9381/22/23/N01 | null | gr-qc | null | In a recent paper published in Classical and Quantum Gravity, 2004, vol. 21,
p. 3803 Carlip used a vector-tensor theory of gravity to calculate the Shapiro
time delay by a moving gravitational lens. He claimed that the relativistic
correction of the order of v/c beyond the static part of the Shapiro delay
depends on ... | [
{
"created": "Mon, 10 Oct 2005 15:08:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kopeikin",
"Sergei M.",
"",
"University of Missouri-Columbia"
]
] | In a recent paper published in Classical and Quantum Gravity, 2004, vol. 21, p. 3803 Carlip used a vector-tensor theory of gravity to calculate the Shapiro time delay by a moving gravitational lens. He claimed that the relativistic correction of the order of v/c beyond the static part of the Shapiro delay depends on th... |
gr-qc/9707041 | Novak | J. Novak (DARC, CNRS, Observatoire de Paris) | Spherical neutron star collapse toward a black hole in tensor-scalar
theory of gravity | 23 pages, LaTeX, 21 PostScript figures, uses RevTeX, accepted for
publication in Physical Review D Numerical appendix added, sec.III rewritten,
figures changed | Phys.Rev. D57 (1998) 4789-4801 | 10.1103/PhysRevD.57.4789 | null | gr-qc astro-ph | null | Complete tensor-scalar and hydrodynamic equations are presented and
integrated, for a self-gravitating perfect fluid. The initial conditions
describe unstable-equilibrium neutron star configuration, with a polytropic
equation of state. They are necessary in order to follow the gravitational
collapse (including full h... | [
{
"created": "Fri, 18 Jul 1997 15:15:59 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jan 1998 14:01:28 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Novak",
"J.",
"",
"DARC, CNRS, Observatoire de Paris"
]
] | Complete tensor-scalar and hydrodynamic equations are presented and integrated, for a self-gravitating perfect fluid. The initial conditions describe unstable-equilibrium neutron star configuration, with a polytropic equation of state. They are necessary in order to follow the gravitational collapse (including full hyd... |
gr-qc/0307087 | Ivan S. N. Booth | Ivan Booth, Stephen Fairhurst | The first law for slowly evolving horizons | 4 pages, typos fixed, minor changes in wording for clarity, to appear
in PRL | Phys.Rev.Lett. 92 (2004) 011102 | 10.1103/PhysRevLett.92.011102 | null | gr-qc | null | We study the mechanics of Hayward's trapping horizons, taking isolated
horizons as equilibrium states. Zeroth and second laws of dynamic horizon
mechanics come from the isolated and trapping horizon formalisms respectively.
We derive a dynamical first law by introducing a new perturbative formulation
for dynamic hori... | [
{
"created": "Fri, 18 Jul 2003 19:15:14 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jan 2004 16:30:19 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Booth",
"Ivan",
""
],
[
"Fairhurst",
"Stephen",
""
]
] | We study the mechanics of Hayward's trapping horizons, taking isolated horizons as equilibrium states. Zeroth and second laws of dynamic horizon mechanics come from the isolated and trapping horizon formalisms respectively. We derive a dynamical first law by introducing a new perturbative formulation for dynamic horizo... |
2401.10097 | Yusuke Mikura | Yusuke Mikura, Roberto Percacci | Some simple theories of gravity with propagating nonmetricity | 20 pages | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate symmetric Metric-Affine Theories of Gravity with a Lagrangian
containing all operators of dimension up to four that are relevant to free
propagation in flat space. Complementing recent work in the antisymmetric case,
we derive the conditions for the existence of a single massive particle with
good prop... | [
{
"created": "Thu, 18 Jan 2024 16:06:32 GMT",
"version": "v1"
}
] | 2024-01-19 | [
[
"Mikura",
"Yusuke",
""
],
[
"Percacci",
"Roberto",
""
]
] | We investigate symmetric Metric-Affine Theories of Gravity with a Lagrangian containing all operators of dimension up to four that are relevant to free propagation in flat space. Complementing recent work in the antisymmetric case, we derive the conditions for the existence of a single massive particle with good proper... |
1806.10488 | Bruno Barros | Bruno J. Barros, Francisco S. N. Lobo | Wormhole geometries supported by three-form fields | 8 pages, 5 figures. V2: Matches published version | Phys. Rev. D 98, 044012 (2018) | 10.1103/PhysRevD.98.044012 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we find novel static and spherically symmetric wormhole
geometries using a three-form field. By solving the gravitational field
equations, we find a variety of analytical and numerical solutions and show
that it is possible for the matter fields threading the wormhole to satisfy the
null and weak energy... | [
{
"created": "Wed, 27 Jun 2018 13:52:42 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Aug 2018 11:41:20 GMT",
"version": "v2"
}
] | 2018-08-10 | [
[
"Barros",
"Bruno J.",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In this work, we find novel static and spherically symmetric wormhole geometries using a three-form field. By solving the gravitational field equations, we find a variety of analytical and numerical solutions and show that it is possible for the matter fields threading the wormhole to satisfy the null and weak energy c... |
2003.02299 | Christian Pfeifer | Manuel Hohmann, Christian Pfeifer, Nicoleta Voicu | Cosmological Finsler Spacetimes | 14 pages, contribution to the Special Issue "Finsler Modification of
Classical General Relativity" in the Journal Universe | Universe 2020, 6(5), 65 | 10.3390/universe6050065 | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Applying the cosmological principle to Finsler spacetimes, we identify the
Lie Algebra of symmetry generators of spatially homogeneous and isotropic
Finsler geometries, thus generalising Friedmann-Lema\^{i}tre-Robertson-Walker
geometry. In particular, we find the most general spatially homogeneous and
isotropic Berwa... | [
{
"created": "Wed, 4 Mar 2020 19:28:54 GMT",
"version": "v1"
},
{
"created": "Tue, 5 May 2020 14:37:13 GMT",
"version": "v2"
}
] | 2020-05-06 | [
[
"Hohmann",
"Manuel",
""
],
[
"Pfeifer",
"Christian",
""
],
[
"Voicu",
"Nicoleta",
""
]
] | Applying the cosmological principle to Finsler spacetimes, we identify the Lie Algebra of symmetry generators of spatially homogeneous and isotropic Finsler geometries, thus generalising Friedmann-Lema\^{i}tre-Robertson-Walker geometry. In particular, we find the most general spatially homogeneous and isotropic Berwald... |
0908.0355 | Reiner Hedrich | Reiner Hedrich | Quantum Gravity: Motivations and Alternatives | 32 pages | Phys. Phil.2010:016,2010 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mutual conceptual incompatibility between GR and QM/QFT is generally seen
as the most essential motivation for the development of a theory of Quantum
Gravity (QG). It leads to the insight that, if gravity is a fundamental
interaction and QM is universally valid, the gravitational field will have to
be quantized, ... | [
{
"created": "Mon, 3 Aug 2009 22:07:48 GMT",
"version": "v1"
}
] | 2011-03-04 | [
[
"Hedrich",
"Reiner",
""
]
] | The mutual conceptual incompatibility between GR and QM/QFT is generally seen as the most essential motivation for the development of a theory of Quantum Gravity (QG). It leads to the insight that, if gravity is a fundamental interaction and QM is universally valid, the gravitational field will have to be quantized, no... |
1112.5269 | Paingalil Kunjan Suresh | Rizwan Ul Haq Ansari and P. K. Suresh | Evolution of the density parameter in the anisotropic DGP cosmology | To apper in Int.J.Mod.Phys.D, 14 pages, 6 figures | null | 10.1142/S0218271811020512 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Evolution of the density parameter in the anisotropic DGP braneworld model is
studied. The role of shear and cross-over scale in the evolution of
$\Omega_\rho$ is examined for both the branches of solution in the DGP model.
The evolution is modified significantly compared to the FRW model and further
it does not depe... | [
{
"created": "Thu, 22 Dec 2011 10:45:34 GMT",
"version": "v1"
}
] | 2011-12-23 | [
[
"Ansari",
"Rizwan Ul Haq",
""
],
[
"Suresh",
"P. K.",
""
]
] | Evolution of the density parameter in the anisotropic DGP braneworld model is studied. The role of shear and cross-over scale in the evolution of $\Omega_\rho$ is examined for both the branches of solution in the DGP model. The evolution is modified significantly compared to the FRW model and further it does not depend... |
2107.12400 | Maciej Dunajski | Maciej Dunajski, Paul Tod | The Kijowski--Liu--Yau quasi-local mass of the Kerr black hole horizon | 9 pages. Dedicated to Gary Gibbons on the occasion of his 75th
birthday. Numerical methods used in the paper clarified. Final version, to
appear in Classical and Quantum Gravity | null | 10.1088/1361-6382/ac2cb6 | null | gr-qc hep-th math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the isometric embedding of the spatial horizon of fast rotating Kerr
black hole in a hyperbolic space to compute the quasi-local mass of the horizon
for any value of the spin parameter $j=J/m^2$. The mass is monotonically
decreasing from twice the ADM mass at $j=0$ to $1.76569m$ at $j=\sqrt{3}/2$. It
then mono... | [
{
"created": "Mon, 26 Jul 2021 18:00:13 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Sep 2021 20:56:42 GMT",
"version": "v2"
}
] | 2021-11-17 | [
[
"Dunajski",
"Maciej",
""
],
[
"Tod",
"Paul",
""
]
] | We use the isometric embedding of the spatial horizon of fast rotating Kerr black hole in a hyperbolic space to compute the quasi-local mass of the horizon for any value of the spin parameter $j=J/m^2$. The mass is monotonically decreasing from twice the ADM mass at $j=0$ to $1.76569m$ at $j=\sqrt{3}/2$. It then monoto... |
2402.04813 | Gaurav Gadbail | Gaurav N. Gadbail, Simran Arora, P.K. Sahoo, and Kazuharu Bamba | Reconstruction of the singularity-free $f(\mathcal{R})$ gravity via
Raychaudhuri equations | EPJC published version | Eur. Phys. J. C 84(7), (2024) 752 | 10.1140/epjc/s10052-024-13107-8 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the bounce cosmology to construct a singularity-free
$f(\mathcal{R})$ model using the reconstruction technique. The formulation of
the $f(\mathcal{R})$ model is based on the Raychaudhari equation, a key element
employed in reconstructed models to eliminate singularities. We explore the
feasibility of obtaini... | [
{
"created": "Wed, 7 Feb 2024 13:04:25 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Feb 2024 17:01:23 GMT",
"version": "v2"
},
{
"created": "Sat, 27 Jul 2024 17:02:23 GMT",
"version": "v3"
}
] | 2024-07-30 | [
[
"Gadbail",
"Gaurav N.",
""
],
[
"Arora",
"Simran",
""
],
[
"Sahoo",
"P. K.",
""
],
[
"Bamba",
"Kazuharu",
""
]
] | We study the bounce cosmology to construct a singularity-free $f(\mathcal{R})$ model using the reconstruction technique. The formulation of the $f(\mathcal{R})$ model is based on the Raychaudhari equation, a key element employed in reconstructed models to eliminate singularities. We explore the feasibility of obtaining... |
gr-qc/9911036 | Stanislav Alexeyev | S.O. Alexeyev, M.V. Sazhin and M.V. Pomazanov (Moscow State
University) | Black Holes of a Minimal Size in String Gravity | 6 LaTeX pages, 1 PostScript figure (epsfig.sty), minor changes in the
text and references, submitted to Int.J.Mod.Phys | Int.J.Mod.Phys. D10 (2001) 225-230 | 10.1142/S0218271801000780 | null | gr-qc | null | A lower limit for a neutral black hole size is obtained in the frames of the
string gravity model with the second order curvature correction. It is shown
that this effect remains when the third order curvature correction is also
taken into account and argued that such restriction does exist in all
perturbative orders... | [
{
"created": "Wed, 10 Nov 1999 07:35:15 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Nov 1999 06:46:45 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Alexeyev",
"S. O.",
"",
"Moscow State\n University"
],
[
"Sazhin",
"M. V.",
"",
"Moscow State\n University"
],
[
"Pomazanov",
"M. V.",
"",
"Moscow State\n University"
]
] | A lower limit for a neutral black hole size is obtained in the frames of the string gravity model with the second order curvature correction. It is shown that this effect remains when the third order curvature correction is also taken into account and argued that such restriction does exist in all perturbative orders o... |
1412.3249 | Oleg Evnin | Ben Craps, Oleg Evnin and Joris Vanhoof | Renormalization, averaging, conservation laws and AdS (in)stability | v3: 28 pages, minor improvements, JHEP version | JHEP 01 (2015) 108 | 10.1007/JHEP01(2015)108 | null | gr-qc hep-th nlin.CD | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We continue our analytic investigations of non-linear spherically symmetric
perturbations around the anti-de Sitter background in gravity-scalar field
systems, and focus on conservation laws restricting the (perturbatively) slow
drift of energy between the different normal modes due to non-linearities. We
discover tw... | [
{
"created": "Wed, 10 Dec 2014 10:36:16 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Dec 2014 17:21:00 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Jan 2015 22:47:33 GMT",
"version": "v3"
}
] | 2015-01-22 | [
[
"Craps",
"Ben",
""
],
[
"Evnin",
"Oleg",
""
],
[
"Vanhoof",
"Joris",
""
]
] | We continue our analytic investigations of non-linear spherically symmetric perturbations around the anti-de Sitter background in gravity-scalar field systems, and focus on conservation laws restricting the (perturbatively) slow drift of energy between the different normal modes due to non-linearities. We discover two ... |
2012.07639 | Saeed Ullah Khan | Saeed Ullah Khan and Jingli Ren | Geodesics and optical properties of rotating black hole in
Randall-Sundrum brane with a cosmological constant | 15 Pages, 11 Figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The presence of tidal charge and a cosmological constant has considerable
consequences on the spacetime geometry and its study is much important from the
observational point of view. Henceforth, we investigate their effects on
particle dynamics and the shadow cast by a Randall-Sundrum braneworld black
hole with a cos... | [
{
"created": "Fri, 11 Dec 2020 07:48:50 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Jan 2021 18:04:04 GMT",
"version": "v2"
}
] | 2021-01-12 | [
[
"Khan",
"Saeed Ullah",
""
],
[
"Ren",
"Jingli",
""
]
] | The presence of tidal charge and a cosmological constant has considerable consequences on the spacetime geometry and its study is much important from the observational point of view. Henceforth, we investigate their effects on particle dynamics and the shadow cast by a Randall-Sundrum braneworld black hole with a cosmo... |
gr-qc/0003032 | Kip S. Thorne | Amos Ori (1), Kip S. Thorne (2) ((1) Department of Physics, Technion -
Israel Institute of Technology, (2) Theoretical Astophysics, California
Institute of Technology) | The Transition from Inspiral to Plunge for a Compact Body in a Circular
Equatorial Orbit Around a Massive, Spinning Black Hole | 8 Pages and 3 Figures; RevTeX; submitted to Physical Review D | Phys.Rev. D62 (2000) 124022 | 10.1103/PhysRevD.62.124022 | null | gr-qc | null | There are three regimes of gravitational-radiation-reaction-induced inspiral
for a compact body with mass mu, in a circular, equatorial orbit around a Kerr
black hole with mass M>>mu: (i) The "adiabatic inspiral regime", in which the
body gradually descends through a sequence of circular, geodesic orbits. (ii) A
"tra... | [
{
"created": "Wed, 8 Mar 2000 18:55:53 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ori",
"Amos",
""
],
[
"Thorne",
"Kip S.",
""
]
] | There are three regimes of gravitational-radiation-reaction-induced inspiral for a compact body with mass mu, in a circular, equatorial orbit around a Kerr black hole with mass M>>mu: (i) The "adiabatic inspiral regime", in which the body gradually descends through a sequence of circular, geodesic orbits. (ii) A "trans... |
1410.7715 | Hao Wei | Zu-Cheng Chen, You Wu, Hao Wei | Post-Newtonian Approximation of Teleparallel Gravity Coupled with a
Scalar Field | 15 pages, revtex4; v2: discussions added, Nucl. Phys. B in press; v3:
published version | Nucl.Phys.B894:422-438,2015 | 10.1016/j.nuclphysb.2015.03.012 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the parameterized post-Newtonian (PPN) formalism to explore the weak
field approximation of teleparallel gravity non-minimally coupling to a scalar
field $\phi$, with arbitrary coupling function $\omega(\phi)$ and potential
$V(\phi)$. We find that all the PPN parameters are identical to general
relativity (GR)... | [
{
"created": "Tue, 28 Oct 2014 18:00:00 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Mar 2015 04:19:00 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Mar 2015 04:59:00 GMT",
"version": "v3"
}
] | 2015-03-25 | [
[
"Chen",
"Zu-Cheng",
""
],
[
"Wu",
"You",
""
],
[
"Wei",
"Hao",
""
]
] | We use the parameterized post-Newtonian (PPN) formalism to explore the weak field approximation of teleparallel gravity non-minimally coupling to a scalar field $\phi$, with arbitrary coupling function $\omega(\phi)$ and potential $V(\phi)$. We find that all the PPN parameters are identical to general relativity (GR), ... |
2205.07412 | Grigoris Panotopoulos | Grigoris Panotopoulos, \'Angel Rinc\'on, Il\'idio Lopes | Binary X-ray sources in massive Brans-Dicke gravity | 11 pages, 4 figures, accepted for publication in Universe. arXiv
admin note: text overlap with arXiv:2108.12984 | Universe 2022, 8(5), 285 | 10.3390/universe8050285 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study focuses on the X-ray emission of low-mass black hole binaries in
massive Brans-Dicke gravity. First, we compute the accretion disk adopting the
well-known Shakura-Sunyaev model for an optically thick, cool, and
geometrically thin disk. Moreover, we assume that the gravitational field
generated by the stell... | [
{
"created": "Mon, 16 May 2022 01:11:10 GMT",
"version": "v1"
}
] | 2022-06-07 | [
[
"Panotopoulos",
"Grigoris",
""
],
[
"Rincón",
"Ángel",
""
],
[
"Lopes",
"Ilídio",
""
]
] | This study focuses on the X-ray emission of low-mass black hole binaries in massive Brans-Dicke gravity. First, we compute the accretion disk adopting the well-known Shakura-Sunyaev model for an optically thick, cool, and geometrically thin disk. Moreover, we assume that the gravitational field generated by the stellar... |
1812.10670 | Sergey Paston | R.V. Ilin, S.A. Paston | Noether and Belinfante stress-energy tensors for theories with arbitrary
Lagrangians of tensor fields | LaTeX, 6 pages, based on a talk given at the International Conference
PhysicA.SPb/2018, Saint Petersburg, Russia, 23-25 October 2018 | Journal of Physics: Conference Series 1135 (2018) 012007 | 10.1088/1742-6596/1135/1/012007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the connection between stress-energy tensor (SET) arising from
Noether's theorem and Belinfante SET which can be obtained as a right-hand side
of the Einstein's equation in the flat metric limit. This question is studied
in the wide class of Poincar\`e-invariant field theories with actions which
depend... | [
{
"created": "Thu, 27 Dec 2018 09:29:49 GMT",
"version": "v1"
}
] | 2018-12-31 | [
[
"Ilin",
"R. V.",
""
],
[
"Paston",
"S. A.",
""
]
] | We investigate the connection between stress-energy tensor (SET) arising from Noether's theorem and Belinfante SET which can be obtained as a right-hand side of the Einstein's equation in the flat metric limit. This question is studied in the wide class of Poincar\`e-invariant field theories with actions which depend o... |
0811.1727 | Robert Beig | Robert Beig and Richard M. Schoen | On Static n-body Configurations in Relativity | 10 pages; result generalized to allow for more than one
asymptotically flat end | Class.Quant.Grav.26:075014,2009 | 10.1088/0264-9381/26/7/075014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The static n-body problem of General Relativity states that there are, under
a reasonable energy condition, no static $n$-body configurations for $n > 1$,
provided the configuration of the bodies satisfies a suitable separation
condition. In this paper we solve this problem in the case that there exists a
closed, non... | [
{
"created": "Tue, 11 Nov 2008 16:10:26 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Mar 2009 15:18:15 GMT",
"version": "v2"
}
] | 2009-03-24 | [
[
"Beig",
"Robert",
""
],
[
"Schoen",
"Richard M.",
""
]
] | The static n-body problem of General Relativity states that there are, under a reasonable energy condition, no static $n$-body configurations for $n > 1$, provided the configuration of the bodies satisfies a suitable separation condition. In this paper we solve this problem in the case that there exists a closed, nonco... |
gr-qc/0305085 | Josep Llosa | J. Llosa and D. Soler | Reference frames and rigid motions in relativity | 30 pages | Class.Quant.Grav.21:3067-3094,2004 | 10.1088/0264-9381/21/13/001 | null | gr-qc | null | A reference frame consists of: a reference space, a time scale and a spatial
metric. The geometric structure induced by these objects in spacetime is
developed. The existence of a class of spatial metrics that are rigid, have
free mobility and can be derived as a slight deformation of the radar metric,
is shown.
| [
{
"created": "Thu, 22 May 2003 11:47:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Llosa",
"J.",
""
],
[
"Soler",
"D.",
""
]
] | A reference frame consists of: a reference space, a time scale and a spatial metric. The geometric structure induced by these objects in spacetime is developed. The existence of a class of spatial metrics that are rigid, have free mobility and can be derived as a slight deformation of the radar metric, is shown. |
2105.06997 | Faizuddin Ahmed | Faizuddin Ahmed | Comment on "An axially symmetric spacetime with causality violation
[Phys. Scr. 96 (07), 075208 (2021)], arXiv:2004.13769[gr-qc]" | 4 pages, comment on arXiv:2004.13769 [gr-qc] | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, an axially symmetric spacetime with causality violation is appeared
in Ref. [1]. There, author presented a type III metric with vanishing
expansion, shear and twist. The matter-energy represents a pure radial field
with a negative cosmological constant. The spacetime is asymptotically anti-de
Sitter space i... | [
{
"created": "Fri, 14 May 2021 13:59:25 GMT",
"version": "v1"
}
] | 2021-05-18 | [
[
"Ahmed",
"Faizuddin",
""
]
] | Recently, an axially symmetric spacetime with causality violation is appeared in Ref. [1]. There, author presented a type III metric with vanishing expansion, shear and twist. The matter-energy represents a pure radial field with a negative cosmological constant. The spacetime is asymptotically anti-de Sitter space in ... |
gr-qc/0401044 | Dinesh Singh | Dinesh Singh | Neutrino Helicity and Chirality Transitions in Schwarzschild Space-Time | REVTeX 4.0 file; 15 pages, no figures | Phys. Rev. D71 (2005) 105003 | 10.1103/PhysRevD.71.105003 | null | gr-qc astro-ph hep-ph | null | We study the helicity and chirality transitions of a high-energy neutrino
propagating in a Schwarzschild space-time background. Using both traditional
Schwarzschild and isotropic spherical co-ordinates, we derive an
ultrarelativistic approximation of the Dirac Hamiltonian to first-order in the
neutrino's rest mass, v... | [
{
"created": "Sun, 11 Jan 2004 18:39:18 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jan 2004 20:17:29 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Mar 2005 23:42:22 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Singh",
"Dinesh",
""
]
] | We study the helicity and chirality transitions of a high-energy neutrino propagating in a Schwarzschild space-time background. Using both traditional Schwarzschild and isotropic spherical co-ordinates, we derive an ultrarelativistic approximation of the Dirac Hamiltonian to first-order in the neutrino's rest mass, via... |
1509.01664 | Marcelo Salgado | Pedro Ca\~nate, Luisa G. Jaime, Marcelo Salgado | Spherically symmetric black holes in $f(R)$ gravity: Is geometric scalar
hair supported ? | 32 pages, 11 figures | null | 10.1088/0264-9381/33/15/155005 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss with a rather critical eye the current situation of black hole
(BH) solutions in $f(R)$ gravity and shed light about its geometrical and
physical significance. We also argue about the meaning, existence or lack
thereof of a Birkhoff's theorem in this kind of modified gravity. We focus then
on the analysis ... | [
{
"created": "Sat, 5 Sep 2015 05:31:41 GMT",
"version": "v1"
}
] | 2016-07-20 | [
[
"Cañate",
"Pedro",
""
],
[
"Jaime",
"Luisa G.",
""
],
[
"Salgado",
"Marcelo",
""
]
] | We discuss with a rather critical eye the current situation of black hole (BH) solutions in $f(R)$ gravity and shed light about its geometrical and physical significance. We also argue about the meaning, existence or lack thereof of a Birkhoff's theorem in this kind of modified gravity. We focus then on the analysis an... |
gr-qc/0611077 | Muzaffer Adak | M. Adak (Pamukkale U.) | The Symmetric Teleparallel Gravity | Paper presented at The 5th Workshop on Quantization, Dualities and
Integrable Systems, Pamukkale University, 23-28 January 2006, Denizli, Turkey | Turk.J.Phys. 30 (2006) 379-390 | null | null | gr-qc | null | We study symmetric teleparallel (STP) gravity model, in which only spacetime
non-metricity is nonzero. First we obtain STP equivalent Einstein-Hilbert
Lagrangian and give an approach for a generic solution in terms of only metric
tensor. Then we obtain a spherically symmetric static solution to the
Einstein's equatio... | [
{
"created": "Tue, 14 Nov 2006 15:50:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Adak",
"M.",
"",
"Pamukkale U."
]
] | We study symmetric teleparallel (STP) gravity model, in which only spacetime non-metricity is nonzero. First we obtain STP equivalent Einstein-Hilbert Lagrangian and give an approach for a generic solution in terms of only metric tensor. Then we obtain a spherically symmetric static solution to the Einstein's equation ... |
1612.04239 | Abhik Kumar Sanyal Dr. | Behzad Tajahmad and Abhik Kumar Sanyal | Unified cosmology with Non-minimally coupled scalar-tensor theory of
gravity | 9 pages, 7 figures | null | 10.1140/epjc/s10052-017-4785-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Unlike Noether symmetry, a metric independent general conserved current exits
for non-minimally coupled scalar-tensor theory of gravity, if the trace of the
energy momentum tensor vanishes. Thus, in the context of cosmology, a symmetry
exists both in the early vacuum and radiation dominated era. For slow roll,
symmet... | [
{
"created": "Fri, 9 Dec 2016 03:35:34 GMT",
"version": "v1"
}
] | 2017-04-26 | [
[
"Tajahmad",
"Behzad",
""
],
[
"Sanyal",
"Abhik Kumar",
""
]
] | Unlike Noether symmetry, a metric independent general conserved current exits for non-minimally coupled scalar-tensor theory of gravity, if the trace of the energy momentum tensor vanishes. Thus, in the context of cosmology, a symmetry exists both in the early vacuum and radiation dominated era. For slow roll, symmetry... |
2201.05866 | Shaoqi Hou | Shou-shan Bao, Shaoqi Hou, Hong Zhang | Searching for wormholes with gravitational wave scattering | 10 pages, 8 figures. Match the published version | Eur. Phys. J. C (2023) 83:127 | 10.1140/epjc/s10052-023-11281-9 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Wormholes bridging distant places of the universe are well-known solutions of
general relativity. In particular, traversable wormholes which allow
interstellar traveling are also popular in science fiction. However, no hint of
their existence has been found yet. In this work, we propose using the
gravitational wave (... | [
{
"created": "Sat, 15 Jan 2022 14:52:34 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Feb 2023 03:27:32 GMT",
"version": "v2"
}
] | 2023-02-28 | [
[
"Bao",
"Shou-shan",
""
],
[
"Hou",
"Shaoqi",
""
],
[
"Zhang",
"Hong",
""
]
] | Wormholes bridging distant places of the universe are well-known solutions of general relativity. In particular, traversable wormholes which allow interstellar traveling are also popular in science fiction. However, no hint of their existence has been found yet. In this work, we propose using the gravitational wave (GW... |
1105.1340 | Martin Bojowald | Martin Bojowald, George M. Paily, Juan D. Reyes, Rakesh Tibrewala | Black-hole horizons in modified space-time structures arising from
canonical quantum gravity | 43 pages, 3 figures | Class. Quantum Grav. 28 (2011) 185006 | 10.1088/0264-9381/28/18/185006 | IGC-11/5-1 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several properties of canonical quantum gravity modify space-time structures,
sometimes to the degree that no effective line elements exist to describe the
geometry. An analysis of solutions, for instance in the context of black holes,
then requires new insights. In this article, standard definitions of horizons
in s... | [
{
"created": "Fri, 6 May 2011 17:47:40 GMT",
"version": "v1"
}
] | 2011-11-04 | [
[
"Bojowald",
"Martin",
""
],
[
"Paily",
"George M.",
""
],
[
"Reyes",
"Juan D.",
""
],
[
"Tibrewala",
"Rakesh",
""
]
] | Several properties of canonical quantum gravity modify space-time structures, sometimes to the degree that no effective line elements exist to describe the geometry. An analysis of solutions, for instance in the context of black holes, then requires new insights. In this article, standard definitions of horizons in sph... |
gr-qc/0312063 | Hrvoje Nikolic | H. Nikolic | Time in quantum gravity by weakening the Hamiltonian constraint | 4 pages | null | null | null | gr-qc hep-th quant-ph | null | We replace the usual Hamiltonian constraint of quantum gravity H|psi>=0 by a
weaker one <psi|H|psi>=0. This allows |psi> to satisfy the time-dependent
functional Schrodinger equation. In general, only the phase of the wave
function appears to be time independent. The resulting quantum theory has the
correct classical... | [
{
"created": "Thu, 11 Dec 2003 15:16:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nikolic",
"H.",
""
]
] | We replace the usual Hamiltonian constraint of quantum gravity H|psi>=0 by a weaker one <psi|H|psi>=0. This allows |psi> to satisfy the time-dependent functional Schrodinger equation. In general, only the phase of the wave function appears to be time independent. The resulting quantum theory has the correct classical l... |
0909.4227 | Alexander Kamenshchik | Alexander Yu. Kamenshchik, Chiara M.F. Mingarelli | A generalized Heckmann-Schucking cosmological solution in the presence
of a negative cosmological constant | 10 pages | Phys.Lett.B693:213-217,2010 | 10.1016/j.physletb.2010.08.065 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An exact solution of the Einstein equations for a Bianchi-I universe in the
presence of dust, stiff matter and a negative cosmological constant,
generalising the well-known Heckmann-Schucking solution is presented. This
solution describes a universe existing during a finite period of cosmic time,
where the beginning ... | [
{
"created": "Wed, 23 Sep 2009 15:24:23 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Kamenshchik",
"Alexander Yu.",
""
],
[
"Mingarelli",
"Chiara M. F.",
""
]
] | An exact solution of the Einstein equations for a Bianchi-I universe in the presence of dust, stiff matter and a negative cosmological constant, generalising the well-known Heckmann-Schucking solution is presented. This solution describes a universe existing during a finite period of cosmic time, where the beginning an... |
1307.4360 | Shih-Yuin Lin | Jason Doukas, Shih-Yuin Lin, B. L. Hu, Robert B. Mann | Unruh Effect under Non-equilibrium conditions: Oscillatory motion of an
Unruh-DeWitt detector | 23 pages, 11 figures. Minor revision, new references added | JHEP 11 (2013) 119 | 10.1007/JHEP11(2013)119 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Unruh effect refers to the thermal fluctuations a detector experiences
while undergoing linear motion with uniform acceleration in a Minkowski vacuum.
This thermality can be demonstrated by tracing the vacuum state of the field
over the modes beyond the accelerated detector's event horizon. However, the
event hor... | [
{
"created": "Tue, 16 Jul 2013 17:56:53 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Dec 2013 08:00:12 GMT",
"version": "v2"
}
] | 2013-12-10 | [
[
"Doukas",
"Jason",
""
],
[
"Lin",
"Shih-Yuin",
""
],
[
"Hu",
"B. L.",
""
],
[
"Mann",
"Robert B.",
""
]
] | The Unruh effect refers to the thermal fluctuations a detector experiences while undergoing linear motion with uniform acceleration in a Minkowski vacuum. This thermality can be demonstrated by tracing the vacuum state of the field over the modes beyond the accelerated detector's event horizon. However, the event horiz... |
gr-qc/9404049 | Gregory A. Burnett | Gregory A. Burnett | Closed spherically symmetric massless scalar field spacetimes have
finite lifetimes | 8 pages (uuencoded postscript file), NCSU-MP-9401 | Phys.Rev.D50:6158-6164,1994 | 10.1103/PhysRevD.50.6158 | null | gr-qc | null | The closed-universe recollapse conjecture is studied for a class of closed
spherically symmetric spacetimes which includes those having as a matter
source: (1) a massless scalar field; (2) a perfect fluid obeying the equation
of state $\rho = P$; and (3) null dust. It is proven that all timelike curves
in any such sp... | [
{
"created": "Tue, 26 Apr 1994 17:10:01 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Burnett",
"Gregory A.",
""
]
] | The closed-universe recollapse conjecture is studied for a class of closed spherically symmetric spacetimes which includes those having as a matter source: (1) a massless scalar field; (2) a perfect fluid obeying the equation of state $\rho = P$; and (3) null dust. It is proven that all timelike curves in any such spac... |
2402.16922 | Mubasher Jamil | Tao Zhu, Hoang Ky Nguyen, Mustapha Azreg-A\"inou, Mubasher Jamil | Observational tests of asymptotically flat ${\cal R}^{2}$ spacetimes | 13 pages, no figure, to appear in EPJC | Eur. Phys. J. C (2024) 84:330 | 10.1140/epjc/s10052-024-12610-2 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A novel class of Buchdahl-inspired metrics with closed-form expressions was
recently obtained based on Buchdahl's seminal work on searching for static,
spherically symmetric metrics in ${\cal R}^{2}$ gravity in vacuo.
Buchdahl-inspired spacetimes provide an interesting framework for testing
predictions of ${\cal R}^{... | [
{
"created": "Mon, 26 Feb 2024 09:56:02 GMT",
"version": "v1"
}
] | 2024-04-01 | [
[
"Zhu",
"Tao",
""
],
[
"Nguyen",
"Hoang Ky",
""
],
[
"Azreg-Aïnou",
"Mustapha",
""
],
[
"Jamil",
"Mubasher",
""
]
] | A novel class of Buchdahl-inspired metrics with closed-form expressions was recently obtained based on Buchdahl's seminal work on searching for static, spherically symmetric metrics in ${\cal R}^{2}$ gravity in vacuo. Buchdahl-inspired spacetimes provide an interesting framework for testing predictions of ${\cal R}^{2}... |
gr-qc/0505036 | Thomas Waters | Brien C. Nolan, Thomas J. Waters | Even perturbations of self-similar Vaidya space-time | Accepted for publication in Physical Review D, 27 pages | Phys.Rev. D71 (2005) 104030 | 10.1103/PhysRevD.71.104030 | null | gr-qc | null | We study even parity metric and matter perturbations of all angular modes in
self-similar Vaidya space-time. We focus on the case where the background
contains a naked singularity. Initial conditions are imposed describing a
finite perturbation emerging from the portion of flat space-time preceding the
matter-filled ... | [
{
"created": "Mon, 9 May 2005 14:37:02 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Nolan",
"Brien C.",
""
],
[
"Waters",
"Thomas J.",
""
]
] | We study even parity metric and matter perturbations of all angular modes in self-similar Vaidya space-time. We focus on the case where the background contains a naked singularity. Initial conditions are imposed describing a finite perturbation emerging from the portion of flat space-time preceding the matter-filled re... |
0809.4744 | Kourosh Nozari | Kourosh Nozari and S. Davood Sadatian | Late-time acceleration and Phantom Divide Line Crossing with Non-minimal
Coupling and Lorentz Invariance Violation | 25 pages, 8 figures | Eur.Phys.J.C58:499-510,2008 | 10.1140/epjc/s10052-008-0767-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider two alternative dark energy models: a Lorentz invariance
preserving model with a nonminimally coupled scalar field and a Lorentz
invariance violating model with a minimally coupled scalar field. We study
accelerated expansion and dynamics of equation of state parameter in these
scenarios. While a minimall... | [
{
"created": "Sat, 27 Sep 2008 06:46:13 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Nozari",
"Kourosh",
""
],
[
"Sadatian",
"S. Davood",
""
]
] | We consider two alternative dark energy models: a Lorentz invariance preserving model with a nonminimally coupled scalar field and a Lorentz invariance violating model with a minimally coupled scalar field. We study accelerated expansion and dynamics of equation of state parameter in these scenarios. While a minimally ... |
gr-qc/0402025 | Cenalo Vaz | Cenalo Vaz | Quantizing Gravitational Collapse | 7 pages, LaTeX. Contribution to the proceedings of QTS3, held the
University of Cincinnati, September 10-14, 2003 | null | 10.1142/9789812702340_0021 | null | gr-qc | null | I summarize some results obtained from a canonical quantization of
gravitational collapse. The quantization is carried out in Kuchar variables on
the LeMaitre-Tolman-Bondi family of spacetimes. I show how mass quantization,
the black hole entropy and Hawking radiation may be understood in these models.
Hawking radiat... | [
{
"created": "Wed, 4 Feb 2004 20:37:20 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Vaz",
"Cenalo",
""
]
] | I summarize some results obtained from a canonical quantization of gravitational collapse. The quantization is carried out in Kuchar variables on the LeMaitre-Tolman-Bondi family of spacetimes. I show how mass quantization, the black hole entropy and Hawking radiation may be understood in these models. Hawking radiatio... |
0809.1284 | Tiberiu Harko | C. S. J. Pun, Z. Kovacs, T. Harko | Thin accretion disks onto brane world black holes | 37 pages, 14 figures, accepted for publication in PRD | Phys.Rev.D78:084015,2008 | 10.1103/PhysRevD.78.084015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The braneworld description of our universe entails a large extra dimension
and a fundamental scale of gravity that might be lower by several orders of
magnitude as compared to the Planck scale. An interesting consequence of the
braneworld scenario is in the nature of the vacuum solutions of the brane
gravitational fi... | [
{
"created": "Mon, 8 Sep 2008 07:22:21 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Sep 2008 07:34:05 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Pun",
"C. S. J.",
""
],
[
"Kovacs",
"Z.",
""
],
[
"Harko",
"T.",
""
]
] | The braneworld description of our universe entails a large extra dimension and a fundamental scale of gravity that might be lower by several orders of magnitude as compared to the Planck scale. An interesting consequence of the braneworld scenario is in the nature of the vacuum solutions of the brane gravitational fiel... |
gr-qc/9411015 | J. L. Rosales | J.L. Rosales | Cosmological solution for the problem of rotation velocities in galaxies | 7 pages, file 'curve.eps' is available from the author by e-mail | null | null | FTUAM 94-25 | gr-qc | null | A solution for the problem of understanding observed rotation curves in
galaxies without the introduction of dark matter halos is presented. This
solution has been obtained upon considering the distribution of masses in the
expanding universe, then, having a cosmological character. A formal limiting
radius for galaxi... | [
{
"created": "Mon, 7 Nov 1994 19:25:38 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Rosales",
"J. L.",
""
]
] | A solution for the problem of understanding observed rotation curves in galaxies without the introduction of dark matter halos is presented. This solution has been obtained upon considering the distribution of masses in the expanding universe, then, having a cosmological character. A formal limiting radius for galaxies... |
2401.05658 | Zeus Sales Moreira | Zeus S. Moreira, Carlos A. R. Herdeiro, Lu\'is C. B. Crispino | Twisting shadows: light rings, lensing and shadows of black holes in
swirling universes | 21 pages, 14 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Using the Ernst formalism, a novel solution of vacuum General Relativity was
recently obtained [1], describing a Schwarzschild black hole (BH) immersed in a
non-asymptotically flat rotating background, dubbed swirling universe, with the
peculiar property that north and south hemispheres spin in opposite directions.
W... | [
{
"created": "Thu, 11 Jan 2024 04:42:44 GMT",
"version": "v1"
}
] | 2024-01-12 | [
[
"Moreira",
"Zeus S.",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Crispino",
"Luís C. B.",
""
]
] | Using the Ernst formalism, a novel solution of vacuum General Relativity was recently obtained [1], describing a Schwarzschild black hole (BH) immersed in a non-asymptotically flat rotating background, dubbed swirling universe, with the peculiar property that north and south hemispheres spin in opposite directions. We ... |
1210.4397 | Jiang Qing-Quan | Qing-Quan Jiang | On black hole spectroscopy via quantum tunneling | 10 pages, submitted | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent work [\emph{Quantum tunneling and black hole spectroscopy, Phys.
Lett.} B686 (2010) 279, arXiv:0907.4271, by Banerjee et al.], it has been
shown, in the tunneling mechanism, the area spacing parameter of a black hole
horizon is given by $\gamma=4$. In this paper, by carefully analyzing the
tunneling process... | [
{
"created": "Tue, 16 Oct 2012 13:24:32 GMT",
"version": "v1"
}
] | 2012-10-17 | [
[
"Jiang",
"Qing-Quan",
""
]
] | In recent work [\emph{Quantum tunneling and black hole spectroscopy, Phys. Lett.} B686 (2010) 279, arXiv:0907.4271, by Banerjee et al.], it has been shown, in the tunneling mechanism, the area spacing parameter of a black hole horizon is given by $\gamma=4$. In this paper, by carefully analyzing the tunneling process o... |
1406.5446 | Gines Perez Teruel | Gin\'es R.P\'erez Teruel | Implications of nonsymmetric metric theories for particle physics. New
interpretation of the Pauli coupling | null | Mod. Phys. Lett. A, 29, 1450098 (2014) | 10.1142/S0217732314500989 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we provide a possible geometrical interpretation of the spin of
elementary particles. In particular, it is investigated how the wave equations
of matter are altered by the addition of an antisymmetric contribution to the
metric tensor. In this scenario the explicit form of the matter wave equations
is in... | [
{
"created": "Fri, 20 Jun 2014 16:13:45 GMT",
"version": "v1"
}
] | 2014-06-23 | [
[
"Teruel",
"Ginés R. Pérez",
""
]
] | In this work we provide a possible geometrical interpretation of the spin of elementary particles. In particular, it is investigated how the wave equations of matter are altered by the addition of an antisymmetric contribution to the metric tensor. In this scenario the explicit form of the matter wave equations is inve... |
1611.09660 | Cristina Blaga | Cristina Blaga | Circular orbits, Lyapunov stability and Manev-type forces | 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we study the stability in the sense of Lyapunov of the
circular orbits in the generalized Manev two bodies problem. First, we explore
the existence of the circular orbits and determine their radius. Then, using
the first integrals of motion we build a positive definite function, known as a
Lyapunov fu... | [
{
"created": "Sun, 27 Nov 2016 14:04:24 GMT",
"version": "v1"
}
] | 2016-11-30 | [
[
"Blaga",
"Cristina",
""
]
] | In this article we study the stability in the sense of Lyapunov of the circular orbits in the generalized Manev two bodies problem. First, we explore the existence of the circular orbits and determine their radius. Then, using the first integrals of motion we build a positive definite function, known as a Lyapunov func... |
1005.1614 | Robert Geroch | Robert Geroch | Faster Than Light? | 13 pages; submitted to J. Lorentz Geometry | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is argued that special relativity remains a viable physical theory even
when there is permitted signals traveling faster than light.
| [
{
"created": "Mon, 10 May 2010 17:42:11 GMT",
"version": "v1"
}
] | 2010-05-11 | [
[
"Geroch",
"Robert",
""
]
] | It is argued that special relativity remains a viable physical theory even when there is permitted signals traveling faster than light. |
gr-qc/9809067 | Michael Reisenberger | Michael P. Reisenberger | On relativistic spin network vertices | 15 pages, one postscript figure (uses psfig) | J.Math.Phys. 40 (1999) 2046-2054 | 10.1063/1.532850 | null | gr-qc | null | Barrett and Crane have proposed a model of simplicial Euclidean quantum
gravity in which a central role is played by a class of Spin(4) spin networks
called "relativistic spin networks" which satisfy a series of physically
motivated constraints. Here a proof is presented that demonstrates that the
intertwiner of a ve... | [
{
"created": "Wed, 23 Sep 1998 19:37:36 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Reisenberger",
"Michael P.",
""
]
] | Barrett and Crane have proposed a model of simplicial Euclidean quantum gravity in which a central role is played by a class of Spin(4) spin networks called "relativistic spin networks" which satisfy a series of physically motivated constraints. Here a proof is presented that demonstrates that the intertwiner of a vert... |
gr-qc/0405047 | Michele Maggiore | Eugenio Coccia, Florian Dubath and Michele Maggiore | On the possible sources of gravitational wave bursts detectable today | 24 pages, 20 figures | Phys.Rev.D70:084010,2004 | 10.1103/PhysRevD.70.084010 | null | gr-qc astro-ph | null | We discuss the possibility that galactic gravitational wave sources might
give burst signals at a rate of several events per year, detectable by
state-of-the-art detectors. We are stimulated by the results of the data
collected by the EXPLORER and NAUTILUS bar detectors in the 2001 run, which
suggest an excess of coi... | [
{
"created": "Sun, 9 May 2004 10:06:45 GMT",
"version": "v1"
},
{
"created": "Wed, 26 May 2004 09:17:07 GMT",
"version": "v2"
}
] | 2011-08-17 | [
[
"Coccia",
"Eugenio",
""
],
[
"Dubath",
"Florian",
""
],
[
"Maggiore",
"Michele",
""
]
] | We discuss the possibility that galactic gravitational wave sources might give burst signals at a rate of several events per year, detectable by state-of-the-art detectors. We are stimulated by the results of the data collected by the EXPLORER and NAUTILUS bar detectors in the 2001 run, which suggest an excess of coinc... |
1504.04290 | J. W. van Holten | J.W. van Holten | Spinning bodies in General Relativity | 8 pages including references. New version: text rewritten and
background material added. Results and conclusions unaltered. Version
presented at the meeting "Variational Principles and Conservation Laws in
General Relativity" (Torino, June 25 2015) | Int. J. of Geom. Methods in Mod. Physics 13 (2016), 1640002 | 10.1142/S0219887816400028 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A covariant hamiltonian formalism for the dynamics of compact spinning bodies
in curved space-time in the test-particle limit is described. The construction
allows a large class of hamiltonians accounting for specific properties and
interactions of spinning bodies. The dynamics for a minimal and a specific
non-minima... | [
{
"created": "Thu, 16 Apr 2015 16:23:22 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Nov 2015 09:40:26 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"van Holten",
"J. W.",
""
]
] | A covariant hamiltonian formalism for the dynamics of compact spinning bodies in curved space-time in the test-particle limit is described. The construction allows a large class of hamiltonians accounting for specific properties and interactions of spinning bodies. The dynamics for a minimal and a specific non-minimal ... |
2404.00643 | Zeeshan Gul | M. Zeeshan Gul, M. Sharif and Adeeba Arooj | Study of Viable Compact Stellar Structures in Non-Riemannian Geometry | 39 pages, 9 figures | Phys. Scr. 99(2024)045006 | 10.1088/1402-4896/ad2c49 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main objective of this article is to study the viable compact stellar
structures in non-Riemannian geometry, i.e., $f(\mathbb{Q},T)$ theory, where
$\mathbb{Q}$ defines the non-metricity and $T$ represents trace of the
stress-energy tensor. In this perspective, we consider a static spherical
metric with anisotropi... | [
{
"created": "Sun, 31 Mar 2024 11:00:08 GMT",
"version": "v1"
}
] | 2024-04-02 | [
[
"Gul",
"M. Zeeshan",
""
],
[
"Sharif",
"M.",
""
],
[
"Arooj",
"Adeeba",
""
]
] | The main objective of this article is to study the viable compact stellar structures in non-Riemannian geometry, i.e., $f(\mathbb{Q},T)$ theory, where $\mathbb{Q}$ defines the non-metricity and $T$ represents trace of the stress-energy tensor. In this perspective, we consider a static spherical metric with anisotropic ... |
gr-qc/9507035 | null | E.S.C. Ching, P.T. Leung, W.M. Suen and K. Young | Wave Propagation in Gravitational Systems: Late Time Behavior | null | Phys.Rev. D52 (1995) 2118-2132 | 10.1103/PhysRevD.52.2118 | WUGRAV-94-8 | gr-qc | null | It is well-known that the dominant late time behavior of waves propagating on
a Schwarzschild spacetime is a power-law tail; tails for other spacetimes have
also been studied. This paper presents a systematic treatment of the tail
phenomenon for a broad class of models via a Green's function formalism and
establishes... | [
{
"created": "Fri, 14 Jul 1995 19:25:49 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Ching",
"E. S. C.",
""
],
[
"Leung",
"P. T.",
""
],
[
"Suen",
"W. M.",
""
],
[
"Young",
"K.",
""
]
] | It is well-known that the dominant late time behavior of waves propagating on a Schwarzschild spacetime is a power-law tail; tails for other spacetimes have also been studied. This paper presents a systematic treatment of the tail phenomenon for a broad class of models via a Green's function formalism and establishes t... |
1108.6207 | Soichiro Isoyama Mr | Soichiro Isoyama, Norichika Sago and Takahiro Tanaka | Cosmic censorship in overcharging a Reissner-Nordstr\"{o}m black hole
via charged particle absorption | 18 pages, revtex4, minor revision and reference added, version to
appear in PRD | Phys.Rev.D84:124024,2011 | 10.1103/PhysRevD.84.124024 | YITP-11-77 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is a claim that a static charged black hole (Reissner-Nordstr\"{o}m
black hole) can be overcharged by absorbing a charged test particle. If it is
true, it might give a counter example to the weak cosmic censorship conjecture,
which states that spacetime singularities are never observed by a distant
observer. Ho... | [
{
"created": "Wed, 31 Aug 2011 12:32:40 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Oct 2011 08:58:54 GMT",
"version": "v2"
}
] | 2011-12-20 | [
[
"Isoyama",
"Soichiro",
""
],
[
"Sago",
"Norichika",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | There is a claim that a static charged black hole (Reissner-Nordstr\"{o}m black hole) can be overcharged by absorbing a charged test particle. If it is true, it might give a counter example to the weak cosmic censorship conjecture, which states that spacetime singularities are never observed by a distant observer. Howe... |
gr-qc/0606003 | Paul Lasky | Paul Lasky, Anthony Lun and Raymond Burston (Monash University) | Initial value formalism for dust collapse | Accepted for publication in the ANZIAM journal | null | null | null | gr-qc | null | Formulating a dust filled spherically symmetric metric utilizing the 3+1
formalism for general relativity, we show that the metric coefficients are
completely determined by the matter distribution throughout the spacetime.
Furthermore, the metric describes both inhomogeneous dust regions and also
vacuum regions in a ... | [
{
"created": "Thu, 1 Jun 2006 01:32:36 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Aug 2007 02:29:21 GMT",
"version": "v2"
}
] | 2011-11-09 | [
[
"Lasky",
"Paul",
"",
"Monash University"
],
[
"Lun",
"Anthony",
"",
"Monash University"
],
[
"Burston",
"Raymond",
"",
"Monash University"
]
] | Formulating a dust filled spherically symmetric metric utilizing the 3+1 formalism for general relativity, we show that the metric coefficients are completely determined by the matter distribution throughout the spacetime. Furthermore, the metric describes both inhomogeneous dust regions and also vacuum regions in a si... |
gr-qc/9305001 | Geza Ful{\o}p | G\'eza F\"ul\"op | About a Super-Ashtekar-Renteln Ansatz | 15 pages, G\"oteborg, ITP 93-7 | Class.Quant.Grav.11:1-10,1994 | 10.1088/0264-9381/11/1/005 | null | gr-qc hep-th | null | The Ashtekar-Renteln Ansatz gives the self-dual solutions to the Einstein
equation. A direct generalization of the Ashtekar-Renteln An\-satz to N=1
supergravity is given both in the canonical and in the covariant formulation
and a geometrical property of the solutions is pointed out. (Changes: the
covariant formulati... | [
{
"created": "Mon, 3 May 1993 08:18:27 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Sep 1993 10:40:19 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Fülöp",
"Géza",
""
]
] | The Ashtekar-Renteln Ansatz gives the self-dual solutions to the Einstein equation. A direct generalization of the Ashtekar-Renteln An\-satz to N=1 supergravity is given both in the canonical and in the covariant formulation and a geometrical property of the solutions is pointed out. (Changes: the covariant formulation... |
2112.02099 | M Blagojevi\'c | Milutin Blagojevi\'c and Branislav Cvetkovi\'c | Entropy of Reissner-Nordstr\"om-like black holes | LaTex, 10 pages; v2: math symbols in abstract corrected | Phys. Lett. B 824 (2022), 136815 | 10.1016/j.physletb.2021.136815 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Poincar\'e gauge theory, black hole entropy is defined canonically by the
variation of a boundary term $\Gamma_H$, located at horizon. For a class of
static and spherically symmetric black holes in vacuum, the explicit formula
reads $\delta\Gamma_H=T\delta S$, where $T$ is black hole temperature and $S$
entropy. H... | [
{
"created": "Thu, 2 Dec 2021 22:16:49 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Feb 2022 14:25:58 GMT",
"version": "v2"
}
] | 2022-02-21 | [
[
"Blagojević",
"Milutin",
""
],
[
"Cvetković",
"Branislav",
""
]
] | In Poincar\'e gauge theory, black hole entropy is defined canonically by the variation of a boundary term $\Gamma_H$, located at horizon. For a class of static and spherically symmetric black holes in vacuum, the explicit formula reads $\delta\Gamma_H=T\delta S$, where $T$ is black hole temperature and $S$ entropy. Her... |
2304.00842 | Sen Guo | Guan-Ru Li, Guo-Ping Li, Sen Guo | Phase transition grade and microstructure of AdS black holes in massive
gravity | 17 pages, 3 figures | Class.Quant.Grav. 39 (2022) 19, 195011 | 10.1088/1361-6382/ac8c7c | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering that under the framework of the massive gravity theory, the
interaction between the mass gravitons and Schwarzschild black hole (BH) could
make it carry a scalar charge, the phase transition process caused by this
scalar charge is investigated in this analysis. The phase transition grade and
microstructur... | [
{
"created": "Mon, 3 Apr 2023 09:37:45 GMT",
"version": "v1"
}
] | 2023-04-04 | [
[
"Li",
"Guan-Ru",
""
],
[
"Li",
"Guo-Ping",
""
],
[
"Guo",
"Sen",
""
]
] | Considering that under the framework of the massive gravity theory, the interaction between the mass gravitons and Schwarzschild black hole (BH) could make it carry a scalar charge, the phase transition process caused by this scalar charge is investigated in this analysis. The phase transition grade and microstructure ... |
0910.5406 | Rakhi R | R. Rakhi, K. Indulekha | Dark Energy and Tracker Solution- A Review | 24 Pages, 1 Figure, 7 Tables | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, basics and some theoretical models of dark energy are
reviewed. Theoretical models include cosmological constant, vacuum fluctuations
of quantum fields, scalar field models, chaplygin gas, vector field models and
Brane world models. Besides this, some alternate models of dark energy are also
included. ... | [
{
"created": "Wed, 28 Oct 2009 15:37:09 GMT",
"version": "v1"
}
] | 2009-10-29 | [
[
"Rakhi",
"R.",
""
],
[
"Indulekha",
"K.",
""
]
] | In this paper, basics and some theoretical models of dark energy are reviewed. Theoretical models include cosmological constant, vacuum fluctuations of quantum fields, scalar field models, chaplygin gas, vector field models and Brane world models. Besides this, some alternate models of dark energy are also included. Fi... |
0901.3011 | Lorenzo Iorio | Lorenzo Iorio | MOND orbits in the Oort cloud | LaTex, 28 pages, no tables, 22 figures, 36 references. To appear in
The Open Astronomy Journal (TOAJ) | Open Astron.J.3:156-166,2010 | 10.2174/1874381101003010156 | null | gr-qc astro-ph.EP astro-ph.GA hep-ph physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We numerically investigate the features of typical orbits occurring in the
Oort cloud (r\approx 50-150 kAU) in the low-acceleration regime of the MOdified
Newtonian Dynamics (MOND). We take into account the so-called External Field
Effect (EFE) because the solar system is embedded in the Milky Way. In the
framework o... | [
{
"created": "Tue, 20 Jan 2009 10:17:45 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jan 2009 10:16:11 GMT",
"version": "v2"
},
{
"created": "Sun, 22 Feb 2009 17:26:38 GMT",
"version": "v3"
},
{
"created": "Wed, 4 Mar 2009 16:39:45 GMT",
"version": "v4"
},
{
"cr... | 2011-04-07 | [
[
"Iorio",
"Lorenzo",
""
]
] | We numerically investigate the features of typical orbits occurring in the Oort cloud (r\approx 50-150 kAU) in the low-acceleration regime of the MOdified Newtonian Dynamics (MOND). We take into account the so-called External Field Effect (EFE) because the solar system is embedded in the Milky Way. In the framework of ... |
1302.6966 | Jean-Marc Schlenker | Francesco Bonsante, Catherine Meusburger, Jean-Marc Schlenker | Recovering the geometry of a flat spacetime from background radiation | 42 pages, several figures | Annales Henri Poincar\'e (2013) 1-67 | 10.1007/s00023-013-0300-6 | null | gr-qc math.DG math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider globally hyperbolic flat spacetimes in 2+1 and 3+1 dimensions, in
which a uniform light signal is emitted on the $r$-level surface of the
cosmological time for $r\to 0$. We show that the frequency of this signal, as
perceived by a fixed observer, is a well-defined, bounded function which is
generally not ... | [
{
"created": "Wed, 27 Feb 2013 19:26:48 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2013 08:24:19 GMT",
"version": "v2"
}
] | 2018-03-28 | [
[
"Bonsante",
"Francesco",
""
],
[
"Meusburger",
"Catherine",
""
],
[
"Schlenker",
"Jean-Marc",
""
]
] | We consider globally hyperbolic flat spacetimes in 2+1 and 3+1 dimensions, in which a uniform light signal is emitted on the $r$-level surface of the cosmological time for $r\to 0$. We show that the frequency of this signal, as perceived by a fixed observer, is a well-defined, bounded function which is generally not co... |
2307.07585 | Massimo Tinto | Massimo Tinto, Sanjeev Dhurandhar | Higher-order Time-Delay Interferometry | 9 pages, 1 figure. arXiv admin note: text overlap with
arXiv:2212.05967 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Time-Delay Interferometry (TDI) is the data processing technique that cancels
the large laser phase fluctuations affecting the one-way Doppler measurements
made by unequal-arm space-based gravitational wave interferometers. In a
previous publication we derived TDI combinations that exactly cancel the laser
phase fluc... | [
{
"created": "Fri, 14 Jul 2023 19:24:19 GMT",
"version": "v1"
}
] | 2023-07-18 | [
[
"Tinto",
"Massimo",
""
],
[
"Dhurandhar",
"Sanjeev",
""
]
] | Time-Delay Interferometry (TDI) is the data processing technique that cancels the large laser phase fluctuations affecting the one-way Doppler measurements made by unequal-arm space-based gravitational wave interferometers. In a previous publication we derived TDI combinations that exactly cancel the laser phase fluctu... |
gr-qc/0702015 | Gregory Adkins | Gregory S. Adkins and Jordan McDonnell | Orbital precession due to central-force perturbations | 10 pages, 1 figure | Phys.Rev.D75:082001,2007 | 10.1103/PhysRevD.75.082001 | null | gr-qc | null | We calculate the precession of Keplerian orbits under the influence of
arbitrary central-force perturbations. Our result is in the form of a
one-dimensional integral that is straightforward to evaluate numerically. We
demonstrate the effectiveness of our formula for the case of the Yukawa
potential. We obtain analyti... | [
{
"created": "Fri, 2 Feb 2007 18:45:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Adkins",
"Gregory S.",
""
],
[
"McDonnell",
"Jordan",
""
]
] | We calculate the precession of Keplerian orbits under the influence of arbitrary central-force perturbations. Our result is in the form of a one-dimensional integral that is straightforward to evaluate numerically. We demonstrate the effectiveness of our formula for the case of the Yukawa potential. We obtain analytic ... |
gr-qc/0208019 | Nathaniel Obadia | N. Obadia and R. Parentani | Uniformly Accelerated Mirrors. Part 1: Mean Fluxes | 23 pages, 7 postscript figures | Phys.Rev. D67 (2003) 024021 | 10.1103/PhysRevD.67.024021 | null | gr-qc | null | The Davies-Fulling model describes the scattering of a massless field by a
moving mirror in 1+1 dimensions. When the mirror travels under uniform
acceleration, one encounters severe problems which are due to the infinite blue
shift effects associated with the horizons. On one hand, the Bogoliubov
coefficients are ill... | [
{
"created": "Wed, 7 Aug 2002 14:13:40 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Obadia",
"N.",
""
],
[
"Parentani",
"R.",
""
]
] | The Davies-Fulling model describes the scattering of a massless field by a moving mirror in 1+1 dimensions. When the mirror travels under uniform acceleration, one encounters severe problems which are due to the infinite blue shift effects associated with the horizons. On one hand, the Bogoliubov coefficients are ill-d... |
gr-qc/0502025 | Antonio J. Segui | M. A. Per and A. Segui | Holographic Cosmology and Uncertainty Relation | 6 pages, 4 figures. To appear in the proceedings of 27th Spanish
Relativity Meeting: Beyond General Relativity (ERES 2004), Madrid, Spain,
23-25 Sep 2004 | null | null | null | gr-qc astro-ph hep-th | null | It is believed that a primary principle of the theory of quantum gravity is
the Holographic Principle according to which a physical system can be described
only by degrees of freedom living on its boundary. The generalized covariant
formulation of the principle considers the entropy content on truncated
light-sheets:... | [
{
"created": "Mon, 7 Feb 2005 19:03:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Per",
"M. A.",
""
],
[
"Segui",
"A.",
""
]
] | It is believed that a primary principle of the theory of quantum gravity is the Holographic Principle according to which a physical system can be described only by degrees of freedom living on its boundary. The generalized covariant formulation of the principle considers the entropy content on truncated light-sheets: l... |
gr-qc/9811051 | Alan D. Rendall | A. D. Rendall, K. P. Tod | Dynamics of spatially homogeneous solutions of the Einstein-Vlasov
equations which are locally rotationally symmetric | 27 pages, 3 figures, LaTeX | Class.Quant.Grav. 16 (1999) 1705-1726 | 10.1088/0264-9381/16/6/305 | null | gr-qc | null | The dynamics of a class of cosmological models with collisionless matter and
four Killing vectors is studied in detail and compared with that of
corresponding perfect fluid models. In many cases it is possible to identify
asymptotic states of the spacetimes near the singularity or in a phase of
unlimited expansion. B... | [
{
"created": "Mon, 16 Nov 1998 15:59:46 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Rendall",
"A. D.",
""
],
[
"Tod",
"K. P.",
""
]
] | The dynamics of a class of cosmological models with collisionless matter and four Killing vectors is studied in detail and compared with that of corresponding perfect fluid models. In many cases it is possible to identify asymptotic states of the spacetimes near the singularity or in a phase of unlimited expansion. Bia... |
1403.7279 | Ran Li | Ran Li, Junkun Zhao | Superradiant instability of the charged scalar field in stringy black
hole mirror system | 5 pages, no figure, published version | Eur. Phys. J. C (2014) 74:3051 | 10.1140/epjc/s10052-014-3051-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown that the mass of the scalar field in the charged stringy
black hole is never able to generate a potential well outside the event horizon
to trap the superradiant modes. This is to say that the charged stringy black
hole is stable against the massive charged scalar perturbation. In this paper
we will... | [
{
"created": "Fri, 28 Mar 2014 04:24:24 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Dec 2014 01:07:33 GMT",
"version": "v2"
}
] | 2014-12-05 | [
[
"Li",
"Ran",
""
],
[
"Zhao",
"Junkun",
""
]
] | It has been shown that the mass of the scalar field in the charged stringy black hole is never able to generate a potential well outside the event horizon to trap the superradiant modes. This is to say that the charged stringy black hole is stable against the massive charged scalar perturbation. In this paper we will s... |
2211.06653 | Shafqat Ul Islam | Shafqat Ul Islam, Jitendra Kumar, Rahul Kumar Walia, Sushant G. Ghosh | Investigating Loop Quantum Gravity with EHT Observational Effects of
Rotating Black holes | 16 Pages, 10 Figures, 2 Tables, Text matched with published version
in 'The Astrophysical Journal' | ApJ 943, 22 (2023) | 10.3847/1538-4357/aca411 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A mathematically consistent rotating black hole model in loop quantum gravity
(LQG) is yet lacking. The scarcity of rotating black hole solutions in LQG
substantially hampers the development of testing LQG from observations, e.g.,
from the Event Horizon Telescope (EHT) observations. The EHT observation
revealed event... | [
{
"created": "Sat, 12 Nov 2022 12:43:34 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Jan 2023 20:52:36 GMT",
"version": "v2"
}
] | 2023-01-25 | [
[
"Islam",
"Shafqat Ul",
""
],
[
"Kumar",
"Jitendra",
""
],
[
"Walia",
"Rahul Kumar",
""
],
[
"Ghosh",
"Sushant G.",
""
]
] | A mathematically consistent rotating black hole model in loop quantum gravity (LQG) is yet lacking. The scarcity of rotating black hole solutions in LQG substantially hampers the development of testing LQG from observations, e.g., from the Event Horizon Telescope (EHT) observations. The EHT observation revealed event h... |
2210.00324 | Pedro Pessoa | Pedro Pessoa, Bruno Arderucio Costa, Steve Press\'e | Revisiting Claims in "Black Hole Entropy: A Closer Look" | null | null | null | null | gr-qc cond-mat.stat-mech | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we explain how C. Tsallis' reply (Entropy 2021, 23(5), 630) fails to
respond to points raised in (Entropy 2020, 22(10), 1110) and introduces further
inconsistencies on the origin of black hole entropy. In his reply, Tsallis
argues that the extensivity of thermodynamical entropy with respect to chosen
variables n... | [
{
"created": "Sat, 1 Oct 2022 17:12:18 GMT",
"version": "v1"
}
] | 2022-10-04 | [
[
"Pessoa",
"Pedro",
""
],
[
"Costa",
"Bruno Arderucio",
""
],
[
"Pressé",
"Steve",
""
]
] | Here we explain how C. Tsallis' reply (Entropy 2021, 23(5), 630) fails to respond to points raised in (Entropy 2020, 22(10), 1110) and introduces further inconsistencies on the origin of black hole entropy. In his reply, Tsallis argues that the extensivity of thermodynamical entropy with respect to chosen variables nee... |
2304.13581 | Zihan Zhang | Zi-han Zhang, Bin Liu, Sheng-hua Yu, and Jie Yang | The Gravitational Wave Forms of Galactic Compact Binaries with
Mass-Transfer Correction | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we focus on the effect of mass-transfer between compact
binaries like neutron-star-neutron-star (NS-NS) systems and
neutron-star-white-dwarf (NS-WD) systems on gravitational waves (GWs). We adopt
the mass quadrupole formula with 2.5 order Post-Newtonian (2.5 PN)
approximation to calculate the GW radiat... | [
{
"created": "Wed, 26 Apr 2023 14:18:38 GMT",
"version": "v1"
},
{
"created": "Sun, 14 May 2023 09:20:48 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Jun 2023 06:20:25 GMT",
"version": "v3"
},
{
"created": "Mon, 12 Jun 2023 14:59:23 GMT",
"version": "v4"
},
{
"cr... | 2024-03-14 | [
[
"Zhang",
"Zi-han",
""
],
[
"Liu",
"Bin",
""
],
[
"Yu",
"Sheng-hua",
""
],
[
"Yang",
"Jie",
""
]
] | In this paper, we focus on the effect of mass-transfer between compact binaries like neutron-star-neutron-star (NS-NS) systems and neutron-star-white-dwarf (NS-WD) systems on gravitational waves (GWs). We adopt the mass quadrupole formula with 2.5 order Post-Newtonian (2.5 PN) approximation to calculate the GW radiatio... |
1805.12362 | Dong-Han Yeom | Anna Nakonieczna, {\L}ukasz Nakonieczny, Dong-han Yeom | Black hole factory: a review of double-null formalism | 28 pages, 17 figures; Invited review for Int.J.Mod.Phys. D | Int.J.Mod.Phys. D28, 1930006 (2019) | 10.1142/S0218271819300064 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this review paper, we comprehensively summarize numerical applications of
double-null formalism for studying dynamics within the theory of gravity. By
using the double-null coordinates, we can investigate dynamical black holes and
gravitational phenomena within spherical symmetry, including gravitational
collapse,... | [
{
"created": "Thu, 31 May 2018 07:48:15 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Feb 2019 04:04:52 GMT",
"version": "v2"
}
] | 2019-02-13 | [
[
"Nakonieczna",
"Anna",
""
],
[
"Nakonieczny",
"Łukasz",
""
],
[
"Yeom",
"Dong-han",
""
]
] | In this review paper, we comprehensively summarize numerical applications of double-null formalism for studying dynamics within the theory of gravity. By using the double-null coordinates, we can investigate dynamical black holes and gravitational phenomena within spherical symmetry, including gravitational collapse, f... |
1911.08602 | Brien C. Nolan | Brien C. Nolan | Causality violation without time-travel: closed lightlike paths in
G\"{o}del's universe | 38 pages (incl. 7 of appendices), 7 figures | null | null | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the issue of causality violations in G\"{o}del's universe,
restricting to geodesic motions. It is well-known that while there are closed
timelike curves in this spacetime, there are no closed causal geodesics. We
show further that no observer can communicate directly (i.e.\ using a single
causal geodesic) ... | [
{
"created": "Tue, 19 Nov 2019 21:42:53 GMT",
"version": "v1"
}
] | 2019-11-21 | [
[
"Nolan",
"Brien C.",
""
]
] | We revisit the issue of causality violations in G\"{o}del's universe, restricting to geodesic motions. It is well-known that while there are closed timelike curves in this spacetime, there are no closed causal geodesics. We show further that no observer can communicate directly (i.e.\ using a single causal geodesic) wi... |
gr-qc/0111065 | Deruelle | Nathalie Deruelle | Stars on branes: the view from the brane | null | null | null | null | gr-qc astro-ph hep-th | null | We consider spherically symmetric matter configurations on a four dimensional
"brane" embedded in a five dimensional $Z_2$-symmetric "bulk". We write the
junction conditions between the interior and exterior of these "stars", treat a
couple of static examples in order to point out the differences with ordinary
four d... | [
{
"created": "Tue, 20 Nov 2001 13:55:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Deruelle",
"Nathalie",
""
]
] | We consider spherically symmetric matter configurations on a four dimensional "brane" embedded in a five dimensional $Z_2$-symmetric "bulk". We write the junction conditions between the interior and exterior of these "stars", treat a couple of static examples in order to point out the differences with ordinary four dim... |
2211.12041 | Mohit Sharma | Mayukh R. Gangopadhyay, Shibesh K. Jas Pacif, M. Sami, and Mohit K.
Sharma | Generic modification of gravity, late time acceleration and Hubble
tension | null | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We consider a scenario of large-scale modification of gravity that does not
invoke extra degrees of freedom but includes coupling between baryonic matter
and dark matter in the Einstein frame. The total matter energy density follows
the standard conservation, and evolution has the character of deceleration in
this fr... | [
{
"created": "Tue, 22 Nov 2022 06:24:13 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Gangopadhyay",
"Mayukh R.",
""
],
[
"Pacif",
"Shibesh K. Jas",
""
],
[
"Sami",
"M.",
""
],
[
"Sharma",
"Mohit K.",
""
]
] | We consider a scenario of large-scale modification of gravity that does not invoke extra degrees of freedom but includes coupling between baryonic matter and dark matter in the Einstein frame. The total matter energy density follows the standard conservation, and evolution has the character of deceleration in this fram... |
1203.2807 | Ali Kaya | Ali Kaya | Comments on the Canonical Measure in Cosmology | 9 pages, 4 figures, revtex4-1, v2: minor typos corrected | Phys.Lett. B713 (2012) 1-5 | 10.1016/j.physletb.2012.05.035 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the mini-superspace approximation to cosmology, the canonical measure can
be used to compute probabilities when a cutoff is introduced in the phase space
to regularize the divergent measure. However, the region initially constrained
by a simple cutoff evolves non-trivially under the Hamiltonian flow. We
determine ... | [
{
"created": "Tue, 13 Mar 2012 13:46:00 GMT",
"version": "v1"
},
{
"created": "Mon, 14 May 2012 07:07:34 GMT",
"version": "v2"
}
] | 2013-06-04 | [
[
"Kaya",
"Ali",
""
]
] | In the mini-superspace approximation to cosmology, the canonical measure can be used to compute probabilities when a cutoff is introduced in the phase space to regularize the divergent measure. However, the region initially constrained by a simple cutoff evolves non-trivially under the Hamiltonian flow. We determine th... |
gr-qc/0304094 | Sijie Gao | Sijie Gao | First law of black hole mechanics in Einstein-Maxwell and
Einstein-Yang-Mills theories | Modified version, major changes made in the introduction. 14 pages,
no figure | Phys.Rev. D68 (2003) 044016 | 10.1103/PhysRevD.68.044016 | null | gr-qc | null | The first law of black hole mechanics is derived from the Einstein-Maxwell
(EM) Lagrangian by comparing two infinitesimally nearby stationary black holes.
With similar arguments, the first law of black hole mechanics in
Einstein-Yang-Mills (EYM) theory is also derived.
| [
{
"created": "Thu, 24 Apr 2003 09:53:46 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Aug 2003 09:10:36 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Gao",
"Sijie",
""
]
] | The first law of black hole mechanics is derived from the Einstein-Maxwell (EM) Lagrangian by comparing two infinitesimally nearby stationary black holes. With similar arguments, the first law of black hole mechanics in Einstein-Yang-Mills (EYM) theory is also derived. |
1511.03508 | Meng-Sen Ma | Meng-Sen Ma, Ren Zhao | Stability of black holes based on horizon thermodynamics | 6 pages, 7 figures | Physics Letters B 751(2015)278 | 10.1016/j.physletb.2015.10.061 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the basis of horizon thermodynamics we study the thermodynamic stability
of black holes constructed in general relativity and Gauss-Bonnet gravity. In
the framework of horizon thermodynamics there are only five thermodynamic
variables $E,P,V,T,S$. It is not necessary to consider concrete matter fields,
which may c... | [
{
"created": "Wed, 11 Nov 2015 14:07:49 GMT",
"version": "v1"
}
] | 2015-11-12 | [
[
"Ma",
"Meng-Sen",
""
],
[
"Zhao",
"Ren",
""
]
] | On the basis of horizon thermodynamics we study the thermodynamic stability of black holes constructed in general relativity and Gauss-Bonnet gravity. In the framework of horizon thermodynamics there are only five thermodynamic variables $E,P,V,T,S$. It is not necessary to consider concrete matter fields, which may con... |
gr-qc/0508125 | Eugene J. Surowitz | Alex Harvey, Engelbert L. Schucking, Eugene J. Surowitz | Redshifts and Killing Vectors | 16 Latex pages, 6 postscript figures, submitted to Am. J. Phys | Am.J.Phys.74:1017-1024,2006 | 10.1119/1.2338544 | null | gr-qc | null | Courses in introductory special and general relativity have increasingly
become part of the curriculum for upper-level undergraduate physics majors and
master's degree candidates. One of the topics rarely discussed is symmetry,
particularly in the theory of general relativity. The principal tool for its
study is the ... | [
{
"created": "Wed, 31 Aug 2005 01:39:37 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Harvey",
"Alex",
""
],
[
"Schucking",
"Engelbert L.",
""
],
[
"Surowitz",
"Eugene J.",
""
]
] | Courses in introductory special and general relativity have increasingly become part of the curriculum for upper-level undergraduate physics majors and master's degree candidates. One of the topics rarely discussed is symmetry, particularly in the theory of general relativity. The principal tool for its study is the Ki... |
2407.13487 | Umananda Dev Goswami | Pranjal Sarmah and Umananda Dev Goswami | Anisotropic cosmology in Bumblebee gravity theory | 20 pages, 7 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Bumblebee vector model of spontaneous Lorentz symmetry breaking (LSB) in
Bianchi type I (BI) Universe to observe its effect on cosmological evolution is
an interesting aspect of study in anisotropic cosmology. In this study, we have
considered a Bumblebee field under vacuum expectation value condition (VEV)
with ... | [
{
"created": "Thu, 18 Jul 2024 13:07:55 GMT",
"version": "v1"
}
] | 2024-07-19 | [
[
"Sarmah",
"Pranjal",
""
],
[
"Goswami",
"Umananda Dev",
""
]
] | The Bumblebee vector model of spontaneous Lorentz symmetry breaking (LSB) in Bianchi type I (BI) Universe to observe its effect on cosmological evolution is an interesting aspect of study in anisotropic cosmology. In this study, we have considered a Bumblebee field under vacuum expectation value condition (VEV) with BI... |
0809.2945 | Marek Nowakowski | M. Nowakowski, I. Arraut | The fate of a gravitational wave in de Sitter spacetime | 17 pages, LaTex | Acta Phys.Polon.B41:911-925,2010 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If we want to explain the recently discovered accelerated stage of the
universe, one of the option we have is to modify the Einstein tensor. The
simplest such modification, in agreement with all observations, is the positive
cosmological constant $\Lambda$. Such a modification will also have its impact
on local obser... | [
{
"created": "Wed, 17 Sep 2008 15:04:18 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Nowakowski",
"M.",
""
],
[
"Arraut",
"I.",
""
]
] | If we want to explain the recently discovered accelerated stage of the universe, one of the option we have is to modify the Einstein tensor. The simplest such modification, in agreement with all observations, is the positive cosmological constant $\Lambda$. Such a modification will also have its impact on local observa... |
2305.11708 | Jefferson Toledo | F. F. Nascimento, V. B. Bezerra, J. M. Toledo | Some remarks on Hayward black hole with a cloud of strings | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We obtain the metric corresponding to the Hayward black hole spacetime
surrounded by a cloud of strings and investigate the role played by this cloud
on the horizons, geodesics, effective potential and thermodynamics. We compare
the obtained results with the ones of the literature, corresponding to the
Hayward black ... | [
{
"created": "Fri, 19 May 2023 14:42:14 GMT",
"version": "v1"
}
] | 2023-05-22 | [
[
"Nascimento",
"F. F.",
""
],
[
"Bezerra",
"V. B.",
""
],
[
"Toledo",
"J. M.",
""
]
] | We obtain the metric corresponding to the Hayward black hole spacetime surrounded by a cloud of strings and investigate the role played by this cloud on the horizons, geodesics, effective potential and thermodynamics. We compare the obtained results with the ones of the literature, corresponding to the Hayward black ho... |
2303.14594 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou, F.P. Fronimos | Inflationary Dynamics and Swampland Criteria for Modified Gauss-Bonnet
Gravity Compatible with GW170817 | PRD Accepted, abstract reduced due to arXiv limitations | Phys.Rev.D 107 (2023) 08, 084007 | 10.1103/PhysRevD.107.084007 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we present an alternative formalism for the inflationary
phenomenology of rescaled Einstein-Gauss-Bonnet models which are in agreement
with the GW170817 event. By constraining the propagation velocity of primordial
tensor perturbations, an approximate form for the time derivative of the scalar
field c... | [
{
"created": "Sun, 26 Mar 2023 00:30:11 GMT",
"version": "v1"
}
] | 2023-08-01 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
],
[
"Fronimos",
"F. P.",
""
]
] | In this article we present an alternative formalism for the inflationary phenomenology of rescaled Einstein-Gauss-Bonnet models which are in agreement with the GW170817 event. By constraining the propagation velocity of primordial tensor perturbations, an approximate form for the time derivative of the scalar field cou... |
gr-qc/9311033 | Henri Waelbroeck | Henri Waelbroeck | B^F Theory and Flat Spacetimes | 21 pp., Mexico Preprint ICN-UNAM-93-12 | Commun.Math.Phys. 170 (1995) 63-78 | 10.1007/BF02099439 | null | gr-qc | null | We propose a reduced constrained Hamiltonian formalism for the exactly
soluble $B \wedge F$ theory of flat connections and closed two-forms over
manifolds with topology $\Sigma^3 \times (0,1)$. The reduced phase space
variables are the holonomies of a flat connection for loops which form a basis
of the first homotopy... | [
{
"created": "Fri, 26 Nov 1993 15:31:39 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Waelbroeck",
"Henri",
""
]
] | We propose a reduced constrained Hamiltonian formalism for the exactly soluble $B \wedge F$ theory of flat connections and closed two-forms over manifolds with topology $\Sigma^3 \times (0,1)$. The reduced phase space variables are the holonomies of a flat connection for loops which form a basis of the first homotopy g... |
gr-qc/9411052 | null | I.B. Khriplovich | Superluminal Velocity of Photons in a Gravitational Background | 5 pages, LaTeX | Phys.Lett. B346 (1995) 251-254 | 10.1016/0370-2693(94)01679-7 | BINP 94-88 | gr-qc | null | The influence of radiative corrections on the photon propagation in a
gravitational background is investigated without the low-frequency
approximation $\omega \ll m$. The conclusion is made in this way that the
velocity of light can exceed unity.
| [
{
"created": "Sun, 20 Nov 1994 09:27:25 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Khriplovich",
"I. B.",
""
]
] | The influence of radiative corrections on the photon propagation in a gravitational background is investigated without the low-frequency approximation $\omega \ll m$. The conclusion is made in this way that the velocity of light can exceed unity. |
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