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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0410103 | Allan Joseph Michael Medved | A.J.M. Medved | Symmetries at stationary Killing horizons | 11 pages, Revtex | Gen.Rel.Grav. 37 (2005) 1947-1956 | 10.1007/s10714-005-0172-2 | null | gr-qc hep-th | null | It has often been suggested (especially by Carlip) that spacetime symmetries
in the neighborhood of a black hole horizon may be relevant to a statistical
understanding of the Bekenstein-Hawking entropy. A prime candidate for this
type of symmetry is that which is exhibited by the Einstein tensor. More
precisely, it i... | [
{
"created": "Thu, 21 Oct 2004 19:04:28 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Medved",
"A. J. M.",
""
]
] | It has often been suggested (especially by Carlip) that spacetime symmetries in the neighborhood of a black hole horizon may be relevant to a statistical understanding of the Bekenstein-Hawking entropy. A prime candidate for this type of symmetry is that which is exhibited by the Einstein tensor. More precisely, it is ... |
2008.09387 | Iber\^e Kuntz | Roberto Casadio, Alexander Kamenshchik, Iber\^e Kuntz | Absence of covariant singularities in pure gravity | Matches version to be published at IJMPD | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The assumptions of the Hawking-Penrose singularity theorem are not covariant
under field redefinitions. Thus we propose to study singularities in field
space, where the spacetime metric is treated as a coordinate along with any
other fields. We show that the field-space Kretschmann scalar for a certain
choice of the ... | [
{
"created": "Fri, 21 Aug 2020 09:38:33 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Nov 2021 08:49:19 GMT",
"version": "v2"
}
] | 2021-11-04 | [
[
"Casadio",
"Roberto",
""
],
[
"Kamenshchik",
"Alexander",
""
],
[
"Kuntz",
"Iberê",
""
]
] | The assumptions of the Hawking-Penrose singularity theorem are not covariant under field redefinitions. Thus we propose to study singularities in field space, where the spacetime metric is treated as a coordinate along with any other fields. We show that the field-space Kretschmann scalar for a certain choice of the De... |
gr-qc/0407026 | Marcelo S. Berman | Marcelo Samuel Berman | Energy of Kerr-Newman Black-Holes and Gravitomagnetism | 6 pages including front cover | null | null | null | gr-qc | null | New formulae are obtained for the energy of K.N. b.h.'s that point out a
gravitomagnetic energy effect. The results are valid for slowly or rapidly
rotating black-holes. The expression of the energy density of Kerr-Newman
back-holes in the slow rotation case, is obtained afterwards, and shown to be
essentially positi... | [
{
"created": "Wed, 7 Jul 2004 01:48:50 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jul 2004 17:52:23 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Aug 2004 01:13:28 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Berman",
"Marcelo Samuel",
""
]
] | New formulae are obtained for the energy of K.N. b.h.'s that point out a gravitomagnetic energy effect. The results are valid for slowly or rapidly rotating black-holes. The expression of the energy density of Kerr-Newman back-holes in the slow rotation case, is obtained afterwards, and shown to be essentially positive... |
gr-qc/0611040 | Thomas Sotiriou | Thomas P. Sotiriou, Stefano Liberati | The metric-affine formalism of f(R) gravity | Talk given by T. P. S. at the 12th Conference on Recent Developments
in Gravity (NEBXII), Nafplio, Greece, 29 Jun-2 Jul 2006 | J.Phys.Conf.Ser.68:012022,2007 | 10.1088/1742-6596/68/1/012022 | null | gr-qc astro-ph hep-th | null | Recently a class of alternative theories of gravity which goes under the name
f(R) gravity, has received considerable attention, mainly due to its
interesting applications in cosmology. However, the phenomenology of such
theories is not only relevant to cosmological scales, especially when it is
treated within the fr... | [
{
"created": "Mon, 6 Nov 2006 15:08:58 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sotiriou",
"Thomas P.",
""
],
[
"Liberati",
"Stefano",
""
]
] | Recently a class of alternative theories of gravity which goes under the name f(R) gravity, has received considerable attention, mainly due to its interesting applications in cosmology. However, the phenomenology of such theories is not only relevant to cosmological scales, especially when it is treated within the fram... |
2110.00393 | Christian J. Kr\"uger | Christian J. Kr\"uger, Kostas D. Kokkotas, Praveen Manoharan,
Sebastian H. V\"olkel | Fast Rotating Neutron Stars: Oscillations and Instabilities | 28 pages, 8 figures. arXiv admin note: text overlap with
arXiv:2008.04127 | Front. Astron. Space Sci. 8:736918 (2021) | 10.3389/fspas.2021.736918 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this review article, we present the main results from our most recent
research concerning the oscillations of fast rotating neutron stars. We derive
a set of time evolution equations for the investigation of non-axisymmetric
oscillations of rapidly rotating compact objects in full general relativity,
taking into a... | [
{
"created": "Fri, 1 Oct 2021 13:22:37 GMT",
"version": "v1"
}
] | 2021-10-04 | [
[
"Krüger",
"Christian J.",
""
],
[
"Kokkotas",
"Kostas D.",
""
],
[
"Manoharan",
"Praveen",
""
],
[
"Völkel",
"Sebastian H.",
""
]
] | In this review article, we present the main results from our most recent research concerning the oscillations of fast rotating neutron stars. We derive a set of time evolution equations for the investigation of non-axisymmetric oscillations of rapidly rotating compact objects in full general relativity, taking into acc... |
1910.04480 | Oliver J. Tattersall | Pedro G. Ferreira, Oliver J. Tattersall | Scale Invariant Gravity and Black Hole Ringdown | 10 pages, submitted to PRD | Phys. Rev. D 101, 024011 (2020) | 10.1103/PhysRevD.101.024011 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scale invariant theories of gravity give a compelling explanation to the
early and late time acceleration of the Universe. Unlike most scalar-tensor
theories, fifth forces are absent and it would therefore seem impossible to
distinguish scale invariant gravity from general relativity. We show that the
ringdown of a S... | [
{
"created": "Thu, 10 Oct 2019 10:58:54 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Ferreira",
"Pedro G.",
""
],
[
"Tattersall",
"Oliver J.",
""
]
] | Scale invariant theories of gravity give a compelling explanation to the early and late time acceleration of the Universe. Unlike most scalar-tensor theories, fifth forces are absent and it would therefore seem impossible to distinguish scale invariant gravity from general relativity. We show that the ringdown of a Sch... |
1507.02278 | Kent Yagi | Joseph Bretz, Kent Yagi and Nicolas Yunes | Four-Hair Relations for Differentially Rotating Neutron Stars in the
Weak-Field Limit | 14 pages, 6 figures; minor modifications, accepted to PRD | Phys. Rev. D 92, 083009 (2015) | 10.1103/PhysRevD.92.083009 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The opportunity to study physics at supra-nuclear densities through X-ray
observations of neutron stars has led to in-depth investigations of certain
approximately universal relations that can remove degeneracies in pulse profile
models. One such set of relations determines all of the multipole moments of a
neutron s... | [
{
"created": "Wed, 8 Jul 2015 20:00:23 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Oct 2015 04:03:06 GMT",
"version": "v2"
}
] | 2015-10-28 | [
[
"Bretz",
"Joseph",
""
],
[
"Yagi",
"Kent",
""
],
[
"Yunes",
"Nicolas",
""
]
] | The opportunity to study physics at supra-nuclear densities through X-ray observations of neutron stars has led to in-depth investigations of certain approximately universal relations that can remove degeneracies in pulse profile models. One such set of relations determines all of the multipole moments of a neutron sta... |
1310.1961 | Orest Hrycyna | Orest Hrycyna, Marek Szydlowski | Dynamical complexity of the Brans-Dicke cosmology | 34 pages, 14 figs; (v2) 36 pages, 16 figs, refs. added, JCAP (in
press) | JCAP12(2013)016 | 10.1088/1475-7516/2013/12/016 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of the Brans-Dicke theory with a quadratic scalar field
potential function and barotropic matter is investigated. The dynamical system
methods are used to reveal complexity of dynamical evolution in homogeneous and
isotropic cosmological models. The structure of phase space crucially depends
on the param... | [
{
"created": "Mon, 7 Oct 2013 21:54:49 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Dec 2013 10:38:28 GMT",
"version": "v2"
}
] | 2013-12-11 | [
[
"Hrycyna",
"Orest",
""
],
[
"Szydlowski",
"Marek",
""
]
] | The dynamics of the Brans-Dicke theory with a quadratic scalar field potential function and barotropic matter is investigated. The dynamical system methods are used to reveal complexity of dynamical evolution in homogeneous and isotropic cosmological models. The structure of phase space crucially depends on the paramet... |
gr-qc/9604007 | Matt Visser | Matt Visser (Washington University) | Gravitational vacuum polarization I: Energy conditions in the
Hartle--Hawking vacuum | 19 pages, ReV_TeX, epsf.sty, 6 eps figures | Phys.Rev.D54:5103-5115,1996 | 10.1103/PhysRevD.54.5103 | null | gr-qc hep-th | null | It is well-known that gravitationally induced vacuum polarization often
violates the point-wise energy conditions and sometimes violates the averaged
energy conditions. In this paper I begin a systematic attack on the question of
where and by how much the various energy conditions are violated. I work in the
test-fie... | [
{
"created": "Wed, 3 Apr 1996 00:14:08 GMT",
"version": "v1"
}
] | 2011-09-09 | [
[
"Visser",
"Matt",
"",
"Washington University"
]
] | It is well-known that gravitationally induced vacuum polarization often violates the point-wise energy conditions and sometimes violates the averaged energy conditions. In this paper I begin a systematic attack on the question of where and by how much the various energy conditions are violated. I work in the test-field... |
0812.2696 | Bob McElrath | Bob McElrath | Emergent Electroweak Gravity | 4 pages | null | null | null | gr-qc astro-ph cond-mat.other hep-ph | http://creativecommons.org/licenses/by/3.0/ | We show that any massive cosmological relic particle with small
self-interactions is a super-fluid today, due to the broadening of its wave
packet, and lack of any elastic scattering. The WIMP dark matter picture is
only consistent its mass $M \gg M_{\rm Pl}$ in order to maintain classicality.
The dynamics of a super... | [
{
"created": "Mon, 15 Dec 2008 15:37:28 GMT",
"version": "v1"
}
] | 2009-01-06 | [
[
"McElrath",
"Bob",
""
]
] | We show that any massive cosmological relic particle with small self-interactions is a super-fluid today, due to the broadening of its wave packet, and lack of any elastic scattering. The WIMP dark matter picture is only consistent its mass $M \gg M_{\rm Pl}$ in order to maintain classicality. The dynamics of a super-f... |
gr-qc/0102092 | Mariusz Dabrowski | Mariusz P. Dabrowski and Janusz Garecki | Superenergy and Supermomentum of Goedel Universes | an amended version, REVTEX, 26 pages, no figures, to appear in
Classical and Quantum Gravity | Class.Quant.Grav. 19 (2002) 1-16 | 10.1088/0264-9381/19/1/301 | null | gr-qc astro-ph | null | We review the canonical superenergy tensor and the canonical angular
supermomentum tensors in general relativity and calculate them for space-time
homogeneous G\"odel universes to show that both of these tensors do not, in
general, vanish. We consider both an original dust-filled pressureless acausal
G\"odel model of... | [
{
"created": "Wed, 21 Feb 2001 16:27:12 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Aug 2001 18:08:41 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Dabrowski",
"Mariusz P.",
""
],
[
"Garecki",
"Janusz",
""
]
] | We review the canonical superenergy tensor and the canonical angular supermomentum tensors in general relativity and calculate them for space-time homogeneous G\"odel universes to show that both of these tensors do not, in general, vanish. We consider both an original dust-filled pressureless acausal G\"odel model of 1... |
gr-qc/0307012 | Alexander Zhidenko | A. Zhidenko | Quasi-normal modes of Schwarzschild-de Sitter black holes | 9 pages, 1 ancillary Mathematica(R) notebook | Class. Quantum Grav. 21: 273-280 (2004) | 10.1088/0264-9381/21/1/019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The low-laying frequencies of characteristic quasi-normal modes (QNM) of
Schwarzschild-de Sitter (SdS) black holes have been calculated for fields of
different spin using the 6th-order WKB approximation and the approximation by
the P\"{o}shl-Teller potential. The well-known asymptotic formula for large $l$
is general... | [
{
"created": "Thu, 3 Jul 2003 13:03:42 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Aug 2003 08:26:43 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Aug 2003 16:02:44 GMT",
"version": "v3"
},
{
"created": "Wed, 3 Dec 2003 19:50:15 GMT",
"version": "v4"
},
{
"creat... | 2020-03-09 | [
[
"Zhidenko",
"A.",
""
]
] | The low-laying frequencies of characteristic quasi-normal modes (QNM) of Schwarzschild-de Sitter (SdS) black holes have been calculated for fields of different spin using the 6th-order WKB approximation and the approximation by the P\"{o}shl-Teller potential. The well-known asymptotic formula for large $l$ is generaliz... |
1611.05324 | Stharporn Sapa | Khamphee Karwan, Stharporn Sapa | Dynamics of the universe with disformal coupling between the dark
sectors | 11 pages, 5 figures | Eur. Phys. J. C (2017) 77: 352 | 10.1140/epjc/s10052-017-4924-4 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the dynamical analysis to study the evolution of the universe at late
time for the model in which the interaction between dark energy and dark matter
is inspired by disformal transformation. We extend the analysis in the existing
literature by supposing that the disformal coefficient depends both on the
scalar... | [
{
"created": "Tue, 15 Nov 2016 04:32:25 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Nov 2016 04:10:59 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Nov 2016 14:14:46 GMT",
"version": "v3"
},
{
"created": "Sat, 11 Feb 2017 08:21:19 GMT",
"version": "v4"
},
{
"c... | 2017-06-06 | [
[
"Karwan",
"Khamphee",
""
],
[
"Sapa",
"Stharporn",
""
]
] | We use the dynamical analysis to study the evolution of the universe at late time for the model in which the interaction between dark energy and dark matter is inspired by disformal transformation. We extend the analysis in the existing literature by supposing that the disformal coefficient depends both on the scalar f... |
1903.03390 | Erico Goulart | Erico Goulart, Nelson Pinto-Neto | On the geometrical hypotheses underlying wave functions and their
emerging dynamics | The version accepted in PRD | Phys. Rev. D 100, 125001 (2019) | 10.1103/PhysRevD.100.125001 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Classical mechanics for individual physical systems and quantum mechanics of
non-relativistic particles are shown to be exceptional cases of a generalized
dynamics described in terms of maps between two manifolds, the source being
configuration space. The target space is argued to be 2-dimensional and flat,
and their... | [
{
"created": "Fri, 8 Mar 2019 12:14:55 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Nov 2019 20:52:56 GMT",
"version": "v2"
}
] | 2019-12-11 | [
[
"Goulart",
"Erico",
""
],
[
"Pinto-Neto",
"Nelson",
""
]
] | Classical mechanics for individual physical systems and quantum mechanics of non-relativistic particles are shown to be exceptional cases of a generalized dynamics described in terms of maps between two manifolds, the source being configuration space. The target space is argued to be 2-dimensional and flat, and their o... |
2010.09811 | Paul R. Anderson | Silvia Pla, Ian M. Newsome, Robert S. Link, Paul R. Anderson, and Jose
Navarro-Salas | Pair production due to an electric field in 1+1 dimensions and the
validity of the semiclassical approximation | Change in the title, a significant amount of rewriting including some
corrections, minor changes in some figures, removal of two figures,
references added. Published version, 42 pages, 10 figures | Phys. Rev. D 103, 105003 (2021) | 10.1103/PhysRevD.103.105003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Solutions to the backreaction equation in 1+1-dimensional semiclassical
electrodynamics are obtained and analyzed when considering a time-varying
homogeneous electric field initially generated by a classical electric current,
coupled to either a quantized scalar field or a quantized spin-$\frac{1}{2}$
field. Particle... | [
{
"created": "Mon, 19 Oct 2020 19:42:17 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Oct 2020 20:05:44 GMT",
"version": "v2"
},
{
"created": "Sat, 8 May 2021 20:05:46 GMT",
"version": "v3"
}
] | 2021-05-12 | [
[
"Pla",
"Silvia",
""
],
[
"Newsome",
"Ian M.",
""
],
[
"Link",
"Robert S.",
""
],
[
"Anderson",
"Paul R.",
""
],
[
"Navarro-Salas",
"Jose",
""
]
] | Solutions to the backreaction equation in 1+1-dimensional semiclassical electrodynamics are obtained and analyzed when considering a time-varying homogeneous electric field initially generated by a classical electric current, coupled to either a quantized scalar field or a quantized spin-$\frac{1}{2}$ field. Particle p... |
gr-qc/9712033 | null | Pedro F. Gonzalez-Diaz | Quantum time machine | 6 pages, RevTex | Phys.Rev. D58 (1998) 124011 | 10.1103/PhysRevD.58.124011 | IMAFF-RCA-97-08 | gr-qc | null | The continuation of Misner space into the Euclidean region is seen to imply
the topological restriction that the period of the closed spatial direction
becomes time-dependent. This restriction results in a modified Lorentzian
Misner space in which the renormalized stress-energy tensor for quantized
complex massless s... | [
{
"created": "Sat, 6 Dec 1997 11:54:30 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Gonzalez-Diaz",
"Pedro F.",
""
]
] | The continuation of Misner space into the Euclidean region is seen to imply the topological restriction that the period of the closed spatial direction becomes time-dependent. This restriction results in a modified Lorentzian Misner space in which the renormalized stress-energy tensor for quantized complex massless sca... |
gr-qc/9511027 | Guido Magnano | Guido Magnano | Are there metric theories of gravity other than General Relativity? | 19 pages, plain TeX, no figures. Talk given at the XI Italian
Conference on General Relativity and Gravitation (Trieste, Sept 26-30, 1994).
improper line break (causing TeX error on line 340) fixed | null | null | null | gr-qc astro-ph | null | Current generalizations of the classical Einstein-Hilbert Lagrangian
formulation of General Relativity are reviewed. Some alternative variational
principles are known to reproduce Einstein's gravitational equations, and
should therefore be regarded as equivalent descriptions of the same physical
model, while other va... | [
{
"created": "Wed, 8 Nov 1995 11:29:50 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Nov 1995 13:36:25 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Magnano",
"Guido",
""
]
] | Current generalizations of the classical Einstein-Hilbert Lagrangian formulation of General Relativity are reviewed. Some alternative variational principles are known to reproduce Einstein's gravitational equations, and should therefore be regarded as equivalent descriptions of the same physical model, while other vari... |
1504.05678 | Hamid Reza Sepangi | H. Mohseni Sadjadi, M. Honardoost and H. R. Sepangi | Symmetry breaking and the onset of cosmic acceleration in scalar field
models | 14 pages, 5 figures | Phys. Dark Univ. 14 (2016) 40-47 | 10.1016/j.dark.2016.09.004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new scenario for the onset of positive acceleration of our
Universe based on symmetry breaking in coupled dark energy scalar field model.
In a symmetry breaking process where the scalar field rolls down its own
potential, the potential reduction is not in favor of acceleration. In our
model, when dark ma... | [
{
"created": "Wed, 22 Apr 2015 07:43:48 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Apr 2015 04:26:05 GMT",
"version": "v2"
},
{
"created": "Sun, 3 May 2015 08:36:24 GMT",
"version": "v3"
},
{
"created": "Tue, 29 Sep 2015 13:30:12 GMT",
"version": "v4"
},
{
"cr... | 2016-10-11 | [
[
"Sadjadi",
"H. Mohseni",
""
],
[
"Honardoost",
"M.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | We propose a new scenario for the onset of positive acceleration of our Universe based on symmetry breaking in coupled dark energy scalar field model. In a symmetry breaking process where the scalar field rolls down its own potential, the potential reduction is not in favor of acceleration. In our model, when dark matt... |
gr-qc/0102011 | null | M. Sharif (Hanyang University) | Momentum Imparted by Gravitational Waves with Spherical Wavefronts | 8 pages, no figure, LaTex | Nuovo Cim.B116:1311-1316,2001 | null | null | gr-qc | null | A different approach has been used to evaluate the momentum imparted by the
gravitational waves with spherical wavefronts. It is shown that the results
obtained for momentum coincide with those already available in the literature.
| [
{
"created": "Mon, 5 Feb 2001 22:47:27 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Sharif",
"M.",
"",
"Hanyang University"
]
] | A different approach has been used to evaluate the momentum imparted by the gravitational waves with spherical wavefronts. It is shown that the results obtained for momentum coincide with those already available in the literature. |
2105.01521 | Katerina Chatziioannou | Katerina Chatziioannou, Maximiliano Isi, Carl-Johan Haster, Tyson B.
Littenberg | A morphology-independent test of the mixed polarization content of
gravitational wave signals from compact binary coalescences | 19 pages, 15 figures, published version | Phys. Rev. D 104, 044005 (2021) | 10.1103/PhysRevD.104.044005 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves in general relativity contain two polarization degrees of
freedom, commonly labeled plus and cross. Besides those two tensor modes,
generic theories of gravity predict up to four additional polarization modes:
two scalar and two vector. Detection of nontensorial modes in gravitational
wave data wo... | [
{
"created": "Tue, 4 May 2021 14:28:31 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Aug 2021 14:42:22 GMT",
"version": "v2"
}
] | 2021-08-11 | [
[
"Chatziioannou",
"Katerina",
""
],
[
"Isi",
"Maximiliano",
""
],
[
"Haster",
"Carl-Johan",
""
],
[
"Littenberg",
"Tyson B.",
""
]
] | Gravitational waves in general relativity contain two polarization degrees of freedom, commonly labeled plus and cross. Besides those two tensor modes, generic theories of gravity predict up to four additional polarization modes: two scalar and two vector. Detection of nontensorial modes in gravitational wave data woul... |
1408.6404 | Eugenio R. Bezerra de Mello | E. R. Bezerra de Mello and A. A. Saharian | Casimir effect in hemisphere capped tubes | 24 pages, 5 figures | Int. J. Theor. Phys. 55(2), 1167-1191 (2016) | 10.1007/s10773-015-2758-0 | null | gr-qc cond-mat.mes-hall quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the vacuum densities for a massive scalar field
with general curvature coupling in background of a (2+1)-dimensional spacetime
corresponding to a cylindrical tube with a hemispherical cap. A complete set of
mode functions is constructed and the positive-frequency Wightman function is
eval... | [
{
"created": "Wed, 27 Aug 2014 13:21:56 GMT",
"version": "v1"
}
] | 2016-01-19 | [
[
"de Mello",
"E. R. Bezerra",
""
],
[
"Saharian",
"A. A.",
""
]
] | In this paper we investigate the vacuum densities for a massive scalar field with general curvature coupling in background of a (2+1)-dimensional spacetime corresponding to a cylindrical tube with a hemispherical cap. A complete set of mode functions is constructed and the positive-frequency Wightman function is evalua... |
1902.02209 | Robert Cameron | Robert P. Cameron | Using a black hole to weigh light: can the Event Horizon Telescope yield
new information about the photon rest mass? | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that data collected by the Event Horizon Telescope or a similar
project might yield new information about the photon rest mass $m_\gamma$, in
the form of evidence that $m_\gamma\ne 0$ together with a lower bound on
$m_\gamma$ or a new upper bound on $m_\gamma$. Using Sgr A*, there is scope to
improve on ... | [
{
"created": "Wed, 6 Feb 2019 14:37:23 GMT",
"version": "v1"
}
] | 2019-02-07 | [
[
"Cameron",
"Robert P.",
""
]
] | We point out that data collected by the Event Horizon Telescope or a similar project might yield new information about the photon rest mass $m_\gamma$, in the form of evidence that $m_\gamma\ne 0$ together with a lower bound on $m_\gamma$ or a new upper bound on $m_\gamma$. Using Sgr A*, there is scope to improve on th... |
0807.1776 | Ujjal Debnath | Writambhara Chakraborty and Ujjal Debnath | Role of Brans-Dicke Theory with or without self-interacting potential in
cosmic acceleration | 12 Latex pages, 20 figures, RevTex style | null | 10.1007/s10773-008-9798-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we have studied the possibility of obtaining cosmic acceleration
in Brans-Dicke theory with varying or constant $\omega$ (Brans- Dicke
parameter) and with or without self-interacting potential, the background fluid
being barotropic fluid or Generalized Chaplygin Gas. Here we take the power law
form of th... | [
{
"created": "Fri, 11 Jul 2008 05:12:10 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Chakraborty",
"Writambhara",
""
],
[
"Debnath",
"Ujjal",
""
]
] | In this work we have studied the possibility of obtaining cosmic acceleration in Brans-Dicke theory with varying or constant $\omega$ (Brans- Dicke parameter) and with or without self-interacting potential, the background fluid being barotropic fluid or Generalized Chaplygin Gas. Here we take the power law form of the ... |
2208.01829 | Hadyan Prihadi | Hadyan Luthfan Prihadi, Freddy Permana Zen, Seramika Ariwahjoedi,
Donny Dwiputra | Replica Trick Calculation for Entanglement Entropy of Static Black Hole
Spacetimes | 41 pages, 12 figures, minor revision, accepted for publication in
International Journal of Geometric Methods in Modern Physics | null | 10.1142/S0219887823501323 | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We calculate the entanglement entropy between two (maximally-extended)
spacetime regions of static black hole, seperated by horizon. As a first case,
we consider the Schwarzschild black hole, and then we extend the calculations
to the charged Reissner- Nordstrom and Schwarzschild-de Sitter black holes with
more than ... | [
{
"created": "Wed, 3 Aug 2022 03:44:05 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Feb 2023 14:25:02 GMT",
"version": "v2"
}
] | 2023-03-15 | [
[
"Prihadi",
"Hadyan Luthfan",
""
],
[
"Zen",
"Freddy Permana",
""
],
[
"Ariwahjoedi",
"Seramika",
""
],
[
"Dwiputra",
"Donny",
""
]
] | We calculate the entanglement entropy between two (maximally-extended) spacetime regions of static black hole, seperated by horizon. As a first case, we consider the Schwarzschild black hole, and then we extend the calculations to the charged Reissner- Nordstrom and Schwarzschild-de Sitter black holes with more than on... |
1602.05645 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou | Unimodular Mimetic $F(R)$ Inflation | null | null | 10.1007/s10509-016-2826-9 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose the unimodular-mimetic $F(R)$ gravity theory, to resolve
cosmological constant problem and dark matter problem in a unified geometric
manner. We demonstrate that such a theory naturally admits accelerating
universe evolution. Furthermore, we construct unimodular-mimetic $F(R)$
inflationary cosmological sce... | [
{
"created": "Thu, 18 Feb 2016 01:25:26 GMT",
"version": "v1"
}
] | 2016-06-29 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | We propose the unimodular-mimetic $F(R)$ gravity theory, to resolve cosmological constant problem and dark matter problem in a unified geometric manner. We demonstrate that such a theory naturally admits accelerating universe evolution. Furthermore, we construct unimodular-mimetic $F(R)$ inflationary cosmological scena... |
gr-qc/0310050 | Sebastian Szybka | Sebastian J. Szybka | Chaotic self-similar wave maps coupled to gravity | 25 pages, 17 figures | Phys.Rev.D69:084014,2004 | 10.1103/PhysRevD.69.084014 | UWThPh-2003-29 | gr-qc | null | We continue our studies of spherically symmetric self-similar solutions in
the SU(2) sigma model coupled to gravity. For some values of the coupling
constant we present numerical evidence for the chaotic solution and the fractal
threshold behavior. We explain this phenomenon in terms of horseshoe-like
dynamics and he... | [
{
"created": "Wed, 8 Oct 2003 19:57:12 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Oct 2003 20:24:12 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Szybka",
"Sebastian J.",
""
]
] | We continue our studies of spherically symmetric self-similar solutions in the SU(2) sigma model coupled to gravity. For some values of the coupling constant we present numerical evidence for the chaotic solution and the fractal threshold behavior. We explain this phenomenon in terms of horseshoe-like dynamics and hete... |
gr-qc/9807056 | Jiro Soda | Jiro Soda, Masa-aki Sakagami, and Shinsuke Kawai | Novel Instability in Superstring Cosmology | 8pages,no figure, to appear in Proceedings of the International
Seminar on Mathematical Cosmology, Potsdam March 30 - April 4, 1998, M.
Rainer and H.-J.Schmidt (eds.), World Scientific PC Singapore | null | null | null | gr-qc | null | As a most promising candidate for quantum theory of the gravity, the
superstring theory has attracted many researchers including cosmologists. It is
expected that the cosmological initial singularity is avoided within the
context of the superstring theory. Indeed, Antoniadis et. al. found an
interesting example of th... | [
{
"created": "Tue, 21 Jul 1998 02:32:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Soda",
"Jiro",
""
],
[
"Sakagami",
"Masa-aki",
""
],
[
"Kawai",
"Shinsuke",
""
]
] | As a most promising candidate for quantum theory of the gravity, the superstring theory has attracted many researchers including cosmologists. It is expected that the cosmological initial singularity is avoided within the context of the superstring theory. Indeed, Antoniadis et. al. found an interesting example of the ... |
0804.1127 | Slava G. Turyshev | Slava G. Turyshev | Tests of Relativistic Gravity in Space: Recent Progress and Future
Directions | 18 pages, 9 figures, invited talk given at the "Atomic Clocks and
Fundamental Constants - ACFC 2007, Bad Honnef 2007; to appear in EPJ Special
Topics | Eur.Phys.J.ST 163:227-253,2008 | 10.1140/epjst/e2008-00822-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the foundations of Einstein's general theory of relativity, discuss
recent progress in the tests of relativistic gravity, and present motivations
for new generation of high-accuracy gravitational experiments. We discuss the
advances in our understanding of fundamental physics anticipated in the near
future ... | [
{
"created": "Mon, 7 Apr 2008 20:19:32 GMT",
"version": "v1"
}
] | 2009-03-12 | [
[
"Turyshev",
"Slava G.",
""
]
] | We review the foundations of Einstein's general theory of relativity, discuss recent progress in the tests of relativistic gravity, and present motivations for new generation of high-accuracy gravitational experiments. We discuss the advances in our understanding of fundamental physics anticipated in the near future an... |
1411.0753 | Saurya Das | Saurya Das, Rajat K. Bhaduri | Dark matter and dark energy from Bose-Einstein condensate | 4 pages, 1 figure. References added and updated. Note added. Version
to appear in Classical and Quantum Gravity | Class.Quant.Grav.32 (2015) 105003 (6pp) | 10.1088/0264-9381/32/10/105003 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that Dark Matter consisting of bosons of mass of about 1eV or less
has critical temperature exceeding the temperature of the universe at all
times, and hence would have formed a Bose-Einstein condensate at very early
epochs. We also show that the wavefunction of this condensate, via the quantum
potential it p... | [
{
"created": "Tue, 4 Nov 2014 01:52:54 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Nov 2014 22:46:53 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Mar 2015 21:07:56 GMT",
"version": "v3"
}
] | 2015-06-18 | [
[
"Das",
"Saurya",
""
],
[
"Bhaduri",
"Rajat K.",
""
]
] | We show that Dark Matter consisting of bosons of mass of about 1eV or less has critical temperature exceeding the temperature of the universe at all times, and hence would have formed a Bose-Einstein condensate at very early epochs. We also show that the wavefunction of this condensate, via the quantum potential it pro... |
1403.3358 | Tiberiu Harko | Tiberiu Harko | Gravitational collapse of Bose-Einstein condensate dark matter halos | 17 pages, 2 figures, accepted for publication in PRD; references
added | Phys. Rev. D 89, 084040, 2014 | 10.1103/PhysRevD.89.084040 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the mechanisms of the gravitational collapse of the Bose-Einstein
condensate dark matter halos, described by the zero temperature time-dependent
nonlinear Schr\"odinger equation (the Gross-Pitaevskii equation), with
repulsive inter-particle interactions. By using a variational approach, and by
choosing an ap... | [
{
"created": "Thu, 13 Mar 2014 18:36:57 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Apr 2014 07:50:45 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Harko",
"Tiberiu",
""
]
] | We study the mechanisms of the gravitational collapse of the Bose-Einstein condensate dark matter halos, described by the zero temperature time-dependent nonlinear Schr\"odinger equation (the Gross-Pitaevskii equation), with repulsive inter-particle interactions. By using a variational approach, and by choosing an appr... |
2002.10155 | John Barrow | John D. Barrow | Non-Euclidean Newtonian Cosmology | 11 pages, no figures | Classical and Quantum Gravity 37, 125007 (2020) | 10.1088/1361-6382/ab8437 | null | gr-qc astro-ph.CO physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We formulate and solve the problem of Newtonian cosmology under the
assumption that the absolute space of Newton is non-Euclidean. In particular,
we focus on the negatively-curved hyperbolic space, H3. We point out the
inequivalence between the curvature term that arises in the Friedmann equation
in Newtonian cosmolo... | [
{
"created": "Mon, 24 Feb 2020 10:47:23 GMT",
"version": "v1"
}
] | 2020-06-17 | [
[
"Barrow",
"John D.",
""
]
] | We formulate and solve the problem of Newtonian cosmology under the assumption that the absolute space of Newton is non-Euclidean. In particular, we focus on the negatively-curved hyperbolic space, H3. We point out the inequivalence between the curvature term that arises in the Friedmann equation in Newtonian cosmology... |
1707.01144 | Sam Dolan Dr | Luiz C S Leite, Sam R Dolan and Lu\'is C B Crispino | Absorption of electromagnetic and gravitational waves by Kerr black
holes: Shadows, superradiance and the spin-helicity effect | 5 pages, 3 figures | null | 10.1016/j.physletb.2017.09.048 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the absorption of plane waves by Kerr black holes. We calculate the
absorption cross section: the area of the black hole shadow at a finite
wavelength. We present a unified picture of the absorption of all massless
bosonic fields, focussing on the on-axis incidence case. We investigate the
spin-helicity effe... | [
{
"created": "Tue, 4 Jul 2017 20:00:04 GMT",
"version": "v1"
}
] | 2018-02-01 | [
[
"Leite",
"Luiz C S",
""
],
[
"Dolan",
"Sam R",
""
],
[
"Crispino",
"Luís C B",
""
]
] | We study the absorption of plane waves by Kerr black holes. We calculate the absorption cross section: the area of the black hole shadow at a finite wavelength. We present a unified picture of the absorption of all massless bosonic fields, focussing on the on-axis incidence case. We investigate the spin-helicity effect... |
gr-qc/0310067 | Tomas Liko | Tomas Liko and Paul S. Wesson | The Big Bang as a Phase Transition | 10 pages, 2 figures; typo corrected in equation (18); 1 reference
added; version to appear in International Journal of Modern Physics A | Int.J.Mod.Phys. A20 (2005) 2037-2045 | 10.1142/S0217751X05022299 | null | gr-qc | null | We study a five-dimensional cosmological model, which suggests that the
universe bagan as a discontinuity in a (Higgs-type) scalar field, or
alternatively as a conventional four-dimensional phase transition.
| [
{
"created": "Mon, 13 Oct 2003 21:17:11 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jan 2005 07:30:36 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Liko",
"Tomas",
""
],
[
"Wesson",
"Paul S.",
""
]
] | We study a five-dimensional cosmological model, which suggests that the universe bagan as a discontinuity in a (Higgs-type) scalar field, or alternatively as a conventional four-dimensional phase transition. |
1212.0978 | Vladimir Khatsymovsky | V. M. Khatsymovsky | On some feature and application of the Faddeev formulation of gravity | 4 pages, Conference paper (Quantum Field Theory and Gravity 2012,
July 31 - August 4 2012, Tomsk, Russia) | TSPU Bulletin, No. 13(128), pp. 76-80, 2012 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Faddeev formulation of gravity, the metric is regarded as composite
field, bilinear of $d = 10$ 4-vector fields. A unique feature is that this
formulation admits the discontinuous fields. On the discrete level, when
spacetime is decomposed into the elementary 4-simplices, this means that the
4-simplices may no... | [
{
"created": "Wed, 5 Dec 2012 09:33:12 GMT",
"version": "v1"
}
] | 2014-02-27 | [
[
"Khatsymovsky",
"V. M.",
""
]
] | In the Faddeev formulation of gravity, the metric is regarded as composite field, bilinear of $d = 10$ 4-vector fields. A unique feature is that this formulation admits the discontinuous fields. On the discrete level, when spacetime is decomposed into the elementary 4-simplices, this means that the 4-simplices may not ... |
gr-qc/0111108 | Stefan Hollands | Stefan Hollands and Robert M. Wald | Existence of Local Covariant Time Ordered Products of Quantum Fields in
Curved Spacetime | Minor revisions, 2 references added. 43 pages, Latex format, no
figures | Commun.Math.Phys. 231 (2002) 309-345 | 10.1007/s00220-002-0719-y | null | gr-qc hep-th math-ph math.MP | null | We establish the existence of local, covariant time ordered products of local
Wick polynomials for a free scalar field in curved spacetime. Our time ordered
products satisfy all of the hypotheses of our previous uniqueness theorem, so
our construction essentially completes the analysis of the existence,
uniqueness an... | [
{
"created": "Fri, 30 Nov 2001 15:42:28 GMT",
"version": "v1"
},
{
"created": "Fri, 31 May 2002 19:18:32 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Hollands",
"Stefan",
""
],
[
"Wald",
"Robert M.",
""
]
] | We establish the existence of local, covariant time ordered products of local Wick polynomials for a free scalar field in curved spacetime. Our time ordered products satisfy all of the hypotheses of our previous uniqueness theorem, so our construction essentially completes the analysis of the existence, uniqueness and ... |
2210.00285 | Laszlo Arpad Gergely | Zolt\'an Keresztes, L\'aszl\'o \'Arp\'ad Gergely | Stability analysis of the spin evolution fix points in inspiraling
compact binaries with black hole, neutron star, gravastar, or boson star
components | 14 pages, 7 figures | Phys. Rev. D 103, 084025 (2021) | 10.1103/PhysRevD.103.084025 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Based on the secular spin evolution of black holes, neutron stars,
gravastars, or boson stars in precessing compact binaries on eccentric orbit,
we identify the aligned and more generic coplanar configurations of the spins
and orbital angular momentum as fix points. Through a dynamical system
analysis, we investigate... | [
{
"created": "Sat, 1 Oct 2022 14:05:30 GMT",
"version": "v1"
}
] | 2022-10-04 | [
[
"Keresztes",
"Zoltán",
""
],
[
"Gergely",
"László Árpád",
""
]
] | Based on the secular spin evolution of black holes, neutron stars, gravastars, or boson stars in precessing compact binaries on eccentric orbit, we identify the aligned and more generic coplanar configurations of the spins and orbital angular momentum as fix points. Through a dynamical system analysis, we investigate t... |
2208.13156 | Takahiro Yamamoto S. | Takahiro S. Yamamoto, Sachiko Kuroyanagi, Guo-Chin Liu | Deep learning for intermittent gravitational wave signals | 13 pages, 11 figures, minor corrections | Phys. Rev. D 107, 044032 (2023) | 10.1103/PhysRevD.107.044032 | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | The ensemble of unresolved compact binary coalescences is a promising source
of the stochastic gravitational wave (GW) background. For stellar-mass black
hole binaries, the astrophysical stochastic GW background is expected to
exhibit non-Gaussianity due to their intermittent features. We investigate the
application ... | [
{
"created": "Sun, 28 Aug 2022 07:33:45 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jan 2023 05:41:18 GMT",
"version": "v2"
}
] | 2023-02-22 | [
[
"Yamamoto",
"Takahiro S.",
""
],
[
"Kuroyanagi",
"Sachiko",
""
],
[
"Liu",
"Guo-Chin",
""
]
] | The ensemble of unresolved compact binary coalescences is a promising source of the stochastic gravitational wave (GW) background. For stellar-mass black hole binaries, the astrophysical stochastic GW background is expected to exhibit non-Gaussianity due to their intermittent features. We investigate the application of... |
1105.2088 | Neil J. Cornish | Neil Cornish, Laura Sampson, Nico Yunes and Frans Pretorius | Gravitational Wave Tests of General Relativity with the Parameterized
Post-Einsteinian Framework | 16 pages, 10 figures. Modified in response to referee comments | null | 10.1103/PhysRevD.84.062003 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave astronomy has tremendous potential for studying extreme
astrophysical phenomena and exploring fundamental physics. The waves produced
by binary black hole mergers will provide a pristine environment in which to
study strong field, dynamical gravity. Extracting detailed information about
these syste... | [
{
"created": "Wed, 11 May 2011 01:36:37 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Aug 2011 17:46:23 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Cornish",
"Neil",
""
],
[
"Sampson",
"Laura",
""
],
[
"Yunes",
"Nico",
""
],
[
"Pretorius",
"Frans",
""
]
] | Gravitational wave astronomy has tremendous potential for studying extreme astrophysical phenomena and exploring fundamental physics. The waves produced by binary black hole mergers will provide a pristine environment in which to study strong field, dynamical gravity. Extracting detailed information about these systems... |
gr-qc/9806064 | null | Dan N. Vollick (University of Victoria) | Negative Energy Density States for the Dirac Field in Flat Spacetime | 11 pages, LaTex | Phys.Rev. D57 (1998) 3484-3488 | 10.1103/PhysRevD.57.3484 | null | gr-qc | null | Negative energy densities in the Dirac field produced by state vectors that
are the superposition of two single particle electron states are examined. I
show that for such states the energy density of the field is not bounded from
below and that the quantum inequalities derived for scalar fields are
satisfied. I also... | [
{
"created": "Mon, 15 Jun 1998 19:41:59 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Vollick",
"Dan N.",
"",
"University of Victoria"
]
] | Negative energy densities in the Dirac field produced by state vectors that are the superposition of two single particle electron states are examined. I show that for such states the energy density of the field is not bounded from below and that the quantum inequalities derived for scalar fields are satisfied. I also s... |
0906.1228 | Michael Jasiulek | Michael Jasiulek | A new method to compute quasi-local spin and other invariants on
marginally trapped surfaces | 22 pages, 5 figures | Class.Quant.Grav.26:245008,2009 | 10.1088/0264-9381/26/24/245008 | CQG/323016/PAP | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We accurately compute the scalar 2-curvature, the Weyl scalars, associated
quasi-local spin, mass and higher multipole moments on marginally trapped
surfaces in numerical 3+1 simulations. To determine the quasi-local quantities
we introduce a new method which requires a set of invariant surface integrals,
allowing fo... | [
{
"created": "Mon, 8 Jun 2009 15:24:13 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Nov 2009 16:20:53 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Jasiulek",
"Michael",
""
]
] | We accurately compute the scalar 2-curvature, the Weyl scalars, associated quasi-local spin, mass and higher multipole moments on marginally trapped surfaces in numerical 3+1 simulations. To determine the quasi-local quantities we introduce a new method which requires a set of invariant surface integrals, allowing for ... |
2205.07207 | Di Wu | Di Wu | Hunting for extra dimensions in the shadow of Sagittarius A* | According to arXiv:2205.11314, the limit $\Delta C \lesssim 10%$ in
my introduction have not been quoted for Sgr A*'s image as explicitly
discussed by the EHT collaboration, so the overall assumption of the
quadrupolemoment $\epsilon \lesssim 4$ for Sgr A* is not applicable | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Vagnozzi and Visinelli's work [Phys. Rev. D 100, 024020 (2020)]
reveals that M87*'s shadow establishes an upper limit of $l \lesssim 170$ AU,
where $l$ is the AdS$_5$ curvature radius and 1 AU is one astronomical unit.
The Event Horizon Telescope, on the other hand, just captured the first image
of the shad... | [
{
"created": "Sun, 15 May 2022 07:47:54 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2022 09:56:22 GMT",
"version": "v2"
}
] | 2022-05-25 | [
[
"Wu",
"Di",
""
]
] | Recently, Vagnozzi and Visinelli's work [Phys. Rev. D 100, 024020 (2020)] reveals that M87*'s shadow establishes an upper limit of $l \lesssim 170$ AU, where $l$ is the AdS$_5$ curvature radius and 1 AU is one astronomical unit. The Event Horizon Telescope, on the other hand, just captured the first image of the shadow... |
1911.02798 | Shaoqi Hou | Shaoqi Hou, Xi-Long Fan, Kai Liao, Zong-Hong Zhu | Gravitational Wave Interference via Gravitational Lensing: Measurements
of Luminosity Distance, Lens Mass, and Cosmological Parameters | 9 pages, 4 figures | Phys. Rev. D 101, 064011 (2020) | 10.1103/PhysRevD.101.064011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational lensing of gravitational waves might cause beat patterns
detectable by interferometers. The feature of this kind of signal is the
existence of the beat pattern in the early inspiral phase, followed by a
seemingly randomly changing profile. After the strain peaks for the first time,
the signal takes ... | [
{
"created": "Thu, 7 Nov 2019 08:20:42 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Mar 2020 09:39:01 GMT",
"version": "v2"
}
] | 2020-03-10 | [
[
"Hou",
"Shaoqi",
""
],
[
"Fan",
"Xi-Long",
""
],
[
"Liao",
"Kai",
""
],
[
"Zhu",
"Zong-Hong",
""
]
] | The gravitational lensing of gravitational waves might cause beat patterns detectable by interferometers. The feature of this kind of signal is the existence of the beat pattern in the early inspiral phase, followed by a seemingly randomly changing profile. After the strain peaks for the first time, the signal takes th... |
1004.5196 | Matteo Smerlak | Valentin Bonzom (CPT), Matteo Smerlak (CPT) | Bubble divergences from cellular cohomology | 5 pages | Lett.Math.Phys.93:295-305,2010 | 10.1007/s11005-010-0414-4 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a class of lattice topological field theories, among which are
the weak-coupling limit of 2d Yang-Mills theory, the Ponzano-Regge model of 3d
quantum gravity and discrete BF theory, whose dynamical variables are flat
discrete connections with compact structure group on a cell 2-complex. In these
models, i... | [
{
"created": "Thu, 29 Apr 2010 06:39:09 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Sep 2010 09:34:33 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Bonzom",
"Valentin",
"",
"CPT"
],
[
"Smerlak",
"Matteo",
"",
"CPT"
]
] | We consider a class of lattice topological field theories, among which are the weak-coupling limit of 2d Yang-Mills theory, the Ponzano-Regge model of 3d quantum gravity and discrete BF theory, whose dynamical variables are flat discrete connections with compact structure group on a cell 2-complex. In these models, it ... |
1911.09066 | Simon Boudet | Flavio Bombacigno, Simon Boudet and Giovanni Montani | Generalized Ashtekar variables for Palatini f(R) models | 27 pages, comments are welcome | null | 10.1016/j.nuclphysb.2020.115281 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider special classes of Palatini f(R) theories, featured by additional
Loop Quantum Gravity inspired terms, with the aim of identifying a set of
modified Ashtekar canonical variables, which still preserve the SU(2) gauge
structure of the standard theory. In particular, we allow for affine connection
to be endo... | [
{
"created": "Wed, 20 Nov 2019 17:59:01 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Mar 2020 10:22:43 GMT",
"version": "v2"
},
{
"created": "Wed, 27 May 2020 13:01:09 GMT",
"version": "v3"
},
{
"created": "Mon, 12 Oct 2020 16:57:57 GMT",
"version": "v4"
},
{
"cr... | 2020-12-22 | [
[
"Bombacigno",
"Flavio",
""
],
[
"Boudet",
"Simon",
""
],
[
"Montani",
"Giovanni",
""
]
] | We consider special classes of Palatini f(R) theories, featured by additional Loop Quantum Gravity inspired terms, with the aim of identifying a set of modified Ashtekar canonical variables, which still preserve the SU(2) gauge structure of the standard theory. In particular, we allow for affine connection to be endowe... |
2402.10249 | Enrique Alvarez | Enrique \'Alvarez and Jes\'us Anero | Superposition of gravitational fields | 11 pages, LaTeX, more details given | null | null | IFT-UAM/CSIC-24-18 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Linear superposition of gravitational fields is shown to be possible for a
large class of spacetimes, in some specific coordinates. Explicit examples are
presented.
| [
{
"created": "Thu, 15 Feb 2024 11:34:01 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Mar 2024 14:13:20 GMT",
"version": "v2"
}
] | 2024-03-07 | [
[
"Álvarez",
"Enrique",
""
],
[
"Anero",
"Jesús",
""
]
] | Linear superposition of gravitational fields is shown to be possible for a large class of spacetimes, in some specific coordinates. Explicit examples are presented. |
gr-qc/0108087 | Hans-Juergen Schmidt | H.-J. Schmidt | The massive scalar field in a closed Friedmann universe model - new
rigorous results | 20 pages, LaTeX, reprinted from Astron. Nachr. 311 (1990) 99 | Astron.Nachr. 311 (1990) 99 | 10.1002/asna.2113110205 | Report UNIPO-MATH-01-AUG-30 | gr-qc | null | For the minimally coupled scalar field in Einstein's theory of gravitation we
look for the space of solutions within the class of closed Friedmann universe
models. We prove that D = 1 or D > 1, where D is the (fractal) dimension of the
set of solutions which can be integrated up to t to infinity. (D > 0 was
conjectur... | [
{
"created": "Fri, 31 Aug 2001 16:33:27 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Schmidt",
"H. -J.",
""
]
] | For the minimally coupled scalar field in Einstein's theory of gravitation we look for the space of solutions within the class of closed Friedmann universe models. We prove that D = 1 or D > 1, where D is the (fractal) dimension of the set of solutions which can be integrated up to t to infinity. (D > 0 was conjectured... |
1002.2832 | Vjacheslav Dorofeev | A. A. Grib, V. Yu. Dorofeev | Spontaneous symmetry breaking for long-wave gravitons in the early
Universe | 13 pages | Grav.Cosmol.16:85-91,2010 | 10.1134/S0202289310020015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that nonlinear terms in equations of gravitons on the background
of curved space-time of the expanding Universe can solve the problem of the
negative square of the effective mass formally arising in linear approximation
for gravitons. Similar to well known spontaneous breaking of symmetry in
Goldstone mod... | [
{
"created": "Mon, 15 Feb 2010 08:44:48 GMT",
"version": "v1"
}
] | 2010-10-12 | [
[
"Grib",
"A. A.",
""
],
[
"Dorofeev",
"V. Yu.",
""
]
] | It is shown that nonlinear terms in equations of gravitons on the background of curved space-time of the expanding Universe can solve the problem of the negative square of the effective mass formally arising in linear approximation for gravitons. Similar to well known spontaneous breaking of symmetry in Goldstone model... |
gr-qc/9403027 | null | Benni Reznik | Thermodynamics and Evaporation of the 2+1-D Black Hole | 11 pages, TAUP 2141/94, Latex | Phys. Rev. D 51, 1728 (1995) | 10.1103/PhysRevD.51.1728 | null | gr-qc hep-th | null | The properties of canonical and microcanonical ensembles of a black hole with
thermal radiation and the problem of black hole evaporation in 3-D are studied.
In 3-D Einstein-anti-de Sitter gravity we have two relevant mass scales,
$m_c=1/G$, and $m_p=(\hbar^2\Lambda/G)^{1/3}$, which are particularly relevant
for the ... | [
{
"created": "Sun, 13 Mar 1994 13:06:01 GMT",
"version": "v1"
}
] | 2016-08-24 | [
[
"Reznik",
"Benni",
""
]
] | The properties of canonical and microcanonical ensembles of a black hole with thermal radiation and the problem of black hole evaporation in 3-D are studied. In 3-D Einstein-anti-de Sitter gravity we have two relevant mass scales, $m_c=1/G$, and $m_p=(\hbar^2\Lambda/G)^{1/3}$, which are particularly relevant for the ev... |
2205.13514 | Shibesh Kumar Jas Pacif | Mohit K. Sharma, Shibesh Kumar Jas Pacif, Gulmira Yergaliyeva, Kuralay
Yesmakhanova | The Oscillatory Universe, phantom crossing and the Hubble tension | 10 pages, 7 figures | null | 10.1016/j.aop.2023.169345 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the validity of cosmological models with an oscillating scale
factor in relation to late-time cosmological observations. We show that these
models not only meet the required late time observational constraints but can
also alleviate the Hubble tension. As a generic feature of the model, the
Hubble para... | [
{
"created": "Thu, 26 May 2022 17:33:05 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Oct 2022 09:00:05 GMT",
"version": "v2"
}
] | 2023-05-31 | [
[
"Sharma",
"Mohit K.",
""
],
[
"Pacif",
"Shibesh Kumar Jas",
""
],
[
"Yergaliyeva",
"Gulmira",
""
],
[
"Yesmakhanova",
"Kuralay",
""
]
] | We investigate the validity of cosmological models with an oscillating scale factor in relation to late-time cosmological observations. We show that these models not only meet the required late time observational constraints but can also alleviate the Hubble tension. As a generic feature of the model, the Hubble parame... |
0912.2271 | Aleksandar Rakic | Aleksandar Rakic, Dennis Simon, Julian Adamek, Jens C. Niemeyer | Cosmological first-order phase transitions beyond the standard
inflationary scenario | 8 pages, 4 figures; proceedings (PoS) of the International Workshop
on Cosmic Structure and Evolution, Bielefeld, Germany, 23-25 September 2009 | PoS Cosmology2009:007,2009 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by cosmological first-order phase transitions we examine the
nucleation and evolution of vacuum bubbles in non-vacuum environments.
Non-standard backgrounds can be relevant in the context of rapid tunneling
processes on the landscape. Utilising complex time methods, we show that
tunneling rates can be notab... | [
{
"created": "Fri, 11 Dec 2009 16:15:34 GMT",
"version": "v1"
}
] | 2010-11-15 | [
[
"Rakic",
"Aleksandar",
""
],
[
"Simon",
"Dennis",
""
],
[
"Adamek",
"Julian",
""
],
[
"Niemeyer",
"Jens C.",
""
]
] | Motivated by cosmological first-order phase transitions we examine the nucleation and evolution of vacuum bubbles in non-vacuum environments. Non-standard backgrounds can be relevant in the context of rapid tunneling processes on the landscape. Utilising complex time methods, we show that tunneling rates can be notably... |
2202.11104 | Sven Krippendorf | Sven Krippendorf, Michael Spannowsky | A duality connecting neural network and cosmological dynamics | 17 pages, 6 figures | null | null | null | gr-qc astro-ph.CO cs.LG hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that the dynamics of neural networks trained with gradient
descent and the dynamics of scalar fields in a flat, vacuum energy dominated
Universe are structurally profoundly related. This duality provides the
framework for synergies between these systems, to understand and explain neural
network dynamic... | [
{
"created": "Tue, 22 Feb 2022 19:00:01 GMT",
"version": "v1"
}
] | 2022-02-24 | [
[
"Krippendorf",
"Sven",
""
],
[
"Spannowsky",
"Michael",
""
]
] | We demonstrate that the dynamics of neural networks trained with gradient descent and the dynamics of scalar fields in a flat, vacuum energy dominated Universe are structurally profoundly related. This duality provides the framework for synergies between these systems, to understand and explain neural network dynamics ... |
gr-qc/0206029 | Robert Mann | R. Kerner and R. B. Mann | Dynamical N-body Equlibrium in Circular Dilaton Gravity | 4 pages, latex, reference added, minor changes in wording | Class.Quant.Grav. 20 (2003) L133-L138 | 10.1088/0264-9381/20/9/102 | WATPHYS-TH02/03 | gr-qc | null | We obtain a new exact equilibrium solution to the N-body problem in a
one-dimensional relativistic self-gravitating system. It corresponds to an
expanding/contracting spacetime of a circle with N bodies at equal proper
separations from one another around the circle. Our methods are
straightforwardly generalizable to ... | [
{
"created": "Mon, 10 Jun 2002 15:21:42 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jun 2002 14:21:33 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Kerner",
"R.",
""
],
[
"Mann",
"R. B.",
""
]
] | We obtain a new exact equilibrium solution to the N-body problem in a one-dimensional relativistic self-gravitating system. It corresponds to an expanding/contracting spacetime of a circle with N bodies at equal proper separations from one another around the circle. Our methods are straightforwardly generalizable to ot... |
2111.00478 | Kartik Prabhu | Kartik Prabhu | A twistorial description of BMS symmetries at null infinity | v2: minor corrections; published in PRD v1: 13 pages | Phys. Rev. D 105, (2022) 024018 | 10.1103/PhysRevD.105.024018 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a novel twistorial construction of the asymptotic BMS symmetries
at null infinity for asymptotically flat spacetimes. We define BMS twistors as
spinor solutions to some set of components of the usual spacetime twistor
equation restricted to null infinity. The space of BMS twistors is
infinite-dimensional.... | [
{
"created": "Sun, 31 Oct 2021 12:14:17 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jan 2022 19:03:45 GMT",
"version": "v2"
}
] | 2022-01-07 | [
[
"Prabhu",
"Kartik",
""
]
] | We describe a novel twistorial construction of the asymptotic BMS symmetries at null infinity for asymptotically flat spacetimes. We define BMS twistors as spinor solutions to some set of components of the usual spacetime twistor equation restricted to null infinity. The space of BMS twistors is infinite-dimensional. W... |
gr-qc/0307039 | Dr. Anirudh Pradhan | Anirudh Pradhan, Sudhir Kumar Srivastav and Mahesh K. Yadav | Some Homogeneous Bianchi Type IX Viscous Fluid Cosmological Models with
a varying $\Lambda$ | 14 pages | Astrophys.Space Sci. 298 (2005) 419-432 | 10.1007/s10509-005-5832-x | null | gr-qc | null | Some Bianchi type IX viscous fluid cosmological models are investigated. To
get a solution a supplementary condition between metric potentials is used. The
viscosity coefficient of bulk viscous fluid is assumed to be a power function
of mass density whereas the coefficient of shear viscosity is considered as
proporti... | [
{
"created": "Wed, 9 Jul 2003 13:24:02 GMT",
"version": "v1"
},
{
"created": "Sun, 5 Oct 2003 06:34:30 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Srivastav",
"Sudhir Kumar",
""
],
[
"Yadav",
"Mahesh K.",
""
]
] | Some Bianchi type IX viscous fluid cosmological models are investigated. To get a solution a supplementary condition between metric potentials is used. The viscosity coefficient of bulk viscous fluid is assumed to be a power function of mass density whereas the coefficient of shear viscosity is considered as proportion... |
1301.0269 | Charles Wang | C. H.-T. Wang, A. O. Hodson, A. St J. Murphy, T. B. Davies, J. T.
Mendonca, R. Bingham | Dynamical trapping and relaxation of scalar gravitational fields | 4 pages; version to appear in PLB | null | 10.1016/j.physletb.2013.09.002 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a framework for nonlinearly coupled scalar-tensor theory of
gravity to address both inflation and core-collapse supernova problems. The
unified approach is based on a novel dynamical trapping and relaxation of
scalar gravity in highly energetic regimes. The new model provides a viable
alternative mechanism... | [
{
"created": "Wed, 2 Jan 2013 17:17:45 GMT",
"version": "v1"
},
{
"created": "Sun, 19 May 2013 09:46:32 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Sep 2013 12:29:18 GMT",
"version": "v3"
}
] | 2013-09-16 | [
[
"Wang",
"C. H. -T.",
""
],
[
"Hodson",
"A. O.",
""
],
[
"Murphy",
"A. St J.",
""
],
[
"Davies",
"T. B.",
""
],
[
"Mendonca",
"J. T.",
""
],
[
"Bingham",
"R.",
""
]
] | We present a framework for nonlinearly coupled scalar-tensor theory of gravity to address both inflation and core-collapse supernova problems. The unified approach is based on a novel dynamical trapping and relaxation of scalar gravity in highly energetic regimes. The new model provides a viable alternative mechanism o... |
2305.04873 | Sebastian Szybka | Sebastian J. Szybka and Syed U. Naqvi | Chaos and Einstein-Rosen gravitational waves | 6 pages, 8 figures; minor changes to match published version | Phys. Rev. D 108, L081501 (2023) | 10.1103/PhysRevD.108.L081501 | null | gr-qc nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate the existence of chaotic geodesics for the Einstein-Rosen
standing gravitational waves. The complex dynamics of massive test particles
are governed by a chaotic heteroclinic network. We present the fractal
associated with the system under investigation. Gravitational standing waves
produce intricate pa... | [
{
"created": "Mon, 8 May 2023 17:18:11 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Dec 2023 13:57:51 GMT",
"version": "v2"
}
] | 2023-12-12 | [
[
"Szybka",
"Sebastian J.",
""
],
[
"Naqvi",
"Syed U.",
""
]
] | We demonstrate the existence of chaotic geodesics for the Einstein-Rosen standing gravitational waves. The complex dynamics of massive test particles are governed by a chaotic heteroclinic network. We present the fractal associated with the system under investigation. Gravitational standing waves produce intricate patt... |
gr-qc/0610134 | Roldao da Rocha | Roldao da Rocha and Carlos H Coimbra-Araujo | Physical Effects of Extra Dimension and Concomitant Map between Photons
and Gravitons in Randall-Sundrum Brane-World Scenario | 6 pages, RevTeX, 4 figures. Presented on the "Fifth International
Conference on Mathematical Methods in Physics", 24-28, April 2006, CBPF, Rio
de Janeiro, Brazil | PoSIC2006:065,2006 | null | null | gr-qc | null | We investigate, in Randall-Sundrum braneworld scenario, the relationship
between perturbations of gravitational and electromagnetic waves in a black
hole neighboorhood, proposing an extra-dimensional braneworld extension of the
traditional formalism. Mutual transformations of electromagnetic and
gravitational fields ... | [
{
"created": "Fri, 27 Oct 2006 01:03:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"da Rocha",
"Roldao",
""
],
[
"Coimbra-Araujo",
"Carlos H",
""
]
] | We investigate, in Randall-Sundrum braneworld scenario, the relationship between perturbations of gravitational and electromagnetic waves in a black hole neighboorhood, proposing an extra-dimensional braneworld extension of the traditional formalism. Mutual transformations of electromagnetic and gravitational fields du... |
1103.1301 | Evan Goetz | E. Goetz and K. Riles | An all-sky search algorithm for continuous gravitational waves from
spinning neutron stars in binary systems | 22 pages, 10 figures, 1 table, Submitted to Classical and Quantum
Gravity | null | 10.1088/0264-9381/28/21/215006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Rapidly spinning neutron stars with non-axisymmetric mass distributions are
expected to generate quasi-monochromatic continuous gravitational waves. While
many searches for unknown, isolated spinning neutron stars have been carried
out, there have been no previous searches for unknown sources in binary
systems. Since... | [
{
"created": "Mon, 7 Mar 2011 15:33:04 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Sep 2011 09:01:31 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Goetz",
"E.",
""
],
[
"Riles",
"K.",
""
]
] | Rapidly spinning neutron stars with non-axisymmetric mass distributions are expected to generate quasi-monochromatic continuous gravitational waves. While many searches for unknown, isolated spinning neutron stars have been carried out, there have been no previous searches for unknown sources in binary systems. Since c... |
gr-qc/0502055 | Niall \'O Murchadha | Niall O Murchadha | Readings of the Lichnerowicz-York equation | 12 pages | Acta Phys.Polon. B36 (2005) 109-120 | null | null | gr-qc | null | James York, in a major extension of Andr\'e Lichnerowicz's work, showed how
to construct solutions to the constraint equations of general relativity. The
York method consists of choosing a 3-metric on a given manifold; a
divergence-free, tracefree (TT) symmetric 2-tensor wrt this metric; and a
single number, the trac... | [
{
"created": "Fri, 11 Feb 2005 16:23:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Murchadha",
"Niall O",
""
]
] | James York, in a major extension of Andr\'e Lichnerowicz's work, showed how to construct solutions to the constraint equations of general relativity. The York method consists of choosing a 3-metric on a given manifold; a divergence-free, tracefree (TT) symmetric 2-tensor wrt this metric; and a single number, the trace ... |
1011.2007 | Hideki Asada | Kei Yamada, Hideki Asada | Uniqueness of collinear solutions for the relativistic three-body
problem | 18 pages, 1 figure; typos corrected, text improved; accepted by PRD | Phys.Rev.D83:024040,2011 | 10.1103/PhysRevD.83.024040 | null | gr-qc astro-ph.EP math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Continuing work initiated in an earlier publication [Yamada, Asada, Phys.
Rev. D 82, 104019 (2010)], we investigate collinear solutions to the general
relativistic three-body problem. We prove the uniqueness of the configuration
for given system parameters (the masses and the end-to-end length). First, we
show that t... | [
{
"created": "Tue, 9 Nov 2010 08:52:25 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jan 2011 03:08:50 GMT",
"version": "v2"
}
] | 2011-02-28 | [
[
"Yamada",
"Kei",
""
],
[
"Asada",
"Hideki",
""
]
] | Continuing work initiated in an earlier publication [Yamada, Asada, Phys. Rev. D 82, 104019 (2010)], we investigate collinear solutions to the general relativistic three-body problem. We prove the uniqueness of the configuration for given system parameters (the masses and the end-to-end length). First, we show that the... |
2005.06296 | Sudip Mishra | Sudip Mishra and Subenoy Chakraborty | Stability analysis of an interacting holographic dark energy model | null | Mod. Phys. Lett. A 34,19:1950147, 2019 | 10.1142/S0217732319501475 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work deals with dynamical system analysis of Holographic Dark
Energy cosmological model with different infra-red (IR)-cutoff. By suitable
transformation of variables the Einstein field equations are converted to an
autonomous system. The critical points are determined and the stability of the
equilibrium ... | [
{
"created": "Tue, 12 May 2020 10:57:05 GMT",
"version": "v1"
}
] | 2020-05-14 | [
[
"Mishra",
"Sudip",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The present work deals with dynamical system analysis of Holographic Dark Energy cosmological model with different infra-red (IR)-cutoff. By suitable transformation of variables the Einstein field equations are converted to an autonomous system. The critical points are determined and the stability of the equilibrium po... |
gr-qc/0703156 | Mauricio Bellini | Silvina Paola Gomez Martinez (Mar del Plata University), Jose Edgar
Madriz Aguilar (DF, Paraiba University), Mauricio Bellini (Mar del Plata
University & CONICET) | Gravitational waves during inflation in presence of a decaying
cosmological parameter from a 5D vacuum theory of gravity | accepted in Phys. Lett. B | Phys.Lett.B649:343-348,2007 | 10.1016/j.physletb.2007.04.043 | null | gr-qc hep-th | null | We study gravitational waves generated during the inflationary epoch in
presence of a decaying cosmological parameter on a 5D geometrical background
which is Riemann flat. Two examples are considered, one with a constant
cosmological parameter and the second with a decreasing one.
| [
{
"created": "Fri, 30 Mar 2007 19:11:52 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Apr 2007 14:51:08 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Apr 2007 14:58:39 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Martinez",
"Silvina Paola Gomez",
"",
"Mar del Plata University"
],
[
"Aguilar",
"Jose Edgar Madriz",
"",
"DF, Paraiba University"
],
[
"Bellini",
"Mauricio",
"",
"Mar del Plata\n University & CONICET"
]
] | We study gravitational waves generated during the inflationary epoch in presence of a decaying cosmological parameter on a 5D geometrical background which is Riemann flat. Two examples are considered, one with a constant cosmological parameter and the second with a decreasing one. |
2306.16988 | Kalin Staykov Dr. | Daniela D. Doneva, Christian J. Kr\"uger, Kalin V. Staykov, Petar Y.
Yordanov | Neutron stars in Gauss-Bonnet gravity -- nonlinear scalarization and
gravitational phase transitions | 16 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It was recently discovered that scalarized neutron stars in scalar-tensor
theories can undergo a gravitational phase transition to a non-scalarized (GR)
state. Surprisingly, even though the driving mechanism is totally different,
the process resembles closely the first-order matter phase transition from
confined nucl... | [
{
"created": "Thu, 29 Jun 2023 14:45:21 GMT",
"version": "v1"
}
] | 2023-06-30 | [
[
"Doneva",
"Daniela D.",
""
],
[
"Krüger",
"Christian J.",
""
],
[
"Staykov",
"Kalin V.",
""
],
[
"Yordanov",
"Petar Y.",
""
]
] | It was recently discovered that scalarized neutron stars in scalar-tensor theories can undergo a gravitational phase transition to a non-scalarized (GR) state. Surprisingly, even though the driving mechanism is totally different, the process resembles closely the first-order matter phase transition from confined nuclea... |
gr-qc/0312106 | Jiro Soda | Jiro Soda, Sugumi Kanno | A Novel Approach to Braneworld | 4pages, talk given at the 13th Workshop on General Relativity and
Gravitation (13 JGRG), Osaka, December 1-4, 2003 | null | null | null | gr-qc | null | Evaluating Kaluza-Klein (KK) corrections is indispensable to test the
braneworld scenario. In this report, we propose a novel symmetry approach to an
effective 4-dimensional action with KK corrections for the Randall-Sundrum
two-brane system.
| [
{
"created": "Wed, 24 Dec 2003 03:43:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Soda",
"Jiro",
""
],
[
"Kanno",
"Sugumi",
""
]
] | Evaluating Kaluza-Klein (KK) corrections is indispensable to test the braneworld scenario. In this report, we propose a novel symmetry approach to an effective 4-dimensional action with KK corrections for the Randall-Sundrum two-brane system. |
gr-qc/0107037 | null | S. Q. Wu and X. Cai | Massive Complex Scalar Field in a Kerr-Sen Black Hole Background: Exact
Solution of Wave Equation and Hawking Radiation | Revtex, 5 pages, no figure, submitted to Phys. Rev. D | J.Math.Phys. 44 (2003) 1084-1088 | 10.1063/1.1539899 | null | gr-qc | null | The separated radial part of a massive complex scalar wave equation in the
Kerr-Sen geometry is shown to satisfy the generalized spheroidal wave equation
which is, in fact, a confluent Heun equation up to a multiplier. The Hawking
evaporation of scalar particles in the Kerr-Sen black hole background is
investigated b... | [
{
"created": "Wed, 11 Jul 2001 02:51:28 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Wu",
"S. Q.",
""
],
[
"Cai",
"X.",
""
]
] | The separated radial part of a massive complex scalar wave equation in the Kerr-Sen geometry is shown to satisfy the generalized spheroidal wave equation which is, in fact, a confluent Heun equation up to a multiplier. The Hawking evaporation of scalar particles in the Kerr-Sen black hole background is investigated by ... |
2103.11253 | Glenn Barnich | Glenn Barnich, Romain Ruzziconi | Coadjoint representation of the BMS group on celestial Riemann surfaces | 45 pages Latex file, minimal cosmetic changes in version 2 | null | 10.1007/JHEP06(2021)079 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The coadjoint representation of the BMS group in four dimensions is
constructed in a formulation that covers both the sphere and the punctured
plane. The structure constants are worked out for different choices of bases.
The conserved current algebra of non-radiative asymptotically flat spacetimes
is explicitly inter... | [
{
"created": "Sat, 20 Mar 2021 22:08:55 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jun 2021 10:07:11 GMT",
"version": "v2"
}
] | 2021-06-30 | [
[
"Barnich",
"Glenn",
""
],
[
"Ruzziconi",
"Romain",
""
]
] | The coadjoint representation of the BMS group in four dimensions is constructed in a formulation that covers both the sphere and the punctured plane. The structure constants are worked out for different choices of bases. The conserved current algebra of non-radiative asymptotically flat spacetimes is explicitly interpr... |
1212.6870 | Diego Pavon | Diego Pav\'on and Ninfa Radicella | Why we need dark energy | 3 pages, no figures. Key words: Cosmology; Dark energy;
Thermodynamics. Submitted to the Proceedings of "13th Marcel Grosmann
Meeting". An extended version was published, under the title "A thermodynamic
motivation for dark energy", in Gen. Relativ. Grav. 44 (2012) 685-702 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is argued that dark energy -or something dynamically equivalent at the
background level- is necessary if the expanding universe is to behave as an
ordinary macroscopic system; that is, if it is to tend to some thermodynamic
equilibrium state in the long run.
| [
{
"created": "Mon, 31 Dec 2012 11:52:00 GMT",
"version": "v1"
}
] | 2013-01-01 | [
[
"Pavón",
"Diego",
""
],
[
"Radicella",
"Ninfa",
""
]
] | It is argued that dark energy -or something dynamically equivalent at the background level- is necessary if the expanding universe is to behave as an ordinary macroscopic system; that is, if it is to tend to some thermodynamic equilibrium state in the long run. |
gr-qc/0206039 | Vilson T. Zanchin | Vilson T. Zanchin, Antares Kleber, Jose' P. S. Lemos | Four-dimensional anti-de Sitter black holes from a three-dimensional
perspective: Full complexity | 26 pages, 1 figure, Uses revtex4 | Phys.Rev.D66:064022,2002 | 10.1103/PhysRevD.66.064022 | null | gr-qc hep-th | null | The dimensional reduction of black hole solutions in four-dimensional (4D)
general relativity is performed and new 3D black hole solutions are obtained.
Considering a 4D spacetime with one spacelike Killing vector, it is possible to
split the Einstein-Hilbert-Maxwell action with a cosmological term in terms of
3D qua... | [
{
"created": "Thu, 13 Jun 2002 20:33:10 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Sep 2002 20:28:15 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Zanchin",
"Vilson T.",
""
],
[
"Kleber",
"Antares",
""
],
[
"Lemos",
"Jose' P. S.",
""
]
] | The dimensional reduction of black hole solutions in four-dimensional (4D) general relativity is performed and new 3D black hole solutions are obtained. Considering a 4D spacetime with one spacelike Killing vector, it is possible to split the Einstein-Hilbert-Maxwell action with a cosmological term in terms of 3D quant... |
1510.01611 | Abdul Jawad | Surajit Chattopadhyay, Abdul Jawad and Shamaila Rani | Holographic polytropic $f(T)$-gravity models | 23 pages; 22 figures; Accepted for publication in AHEP | Advances in High Energy Physics 2015 (2015) 798902 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present paper reports a study on the cosmological consequences arising
from reconstructing $f(T)$ gravity through new holographic-polytropic dark
energy. We assume two approaches, namely a particular form of Hubble parameter
$H$ and a solution for $f(T)$. We obtain the deceleration parameter, effective
equation o... | [
{
"created": "Mon, 5 Oct 2015 13:51:36 GMT",
"version": "v1"
}
] | 2016-11-01 | [
[
"Chattopadhyay",
"Surajit",
""
],
[
"Jawad",
"Abdul",
""
],
[
"Rani",
"Shamaila",
""
]
] | The present paper reports a study on the cosmological consequences arising from reconstructing $f(T)$ gravity through new holographic-polytropic dark energy. We assume two approaches, namely a particular form of Hubble parameter $H$ and a solution for $f(T)$. We obtain the deceleration parameter, effective equation of ... |
2103.08162 | Benrong Mu | Rui Yin, Jing Liang and Benrong Mu | Stability of horizon with pressure and volume of d-dimensional charged
AdS black holes with cloud of strings and quintessence | 63 pages, 38 figures and 27 tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the thermodynamics and the stability of horizon of the charged
AdS black hole surrounded by quintessence and cloud of strings in d-dimensional
spacetime are studied via the scalar field scattering and the charged particle
absorption. The cosmological constant is interpreted as a thermodynamics
variable... | [
{
"created": "Mon, 15 Mar 2021 07:06:18 GMT",
"version": "v1"
}
] | 2021-03-16 | [
[
"Yin",
"Rui",
""
],
[
"Liang",
"Jing",
""
],
[
"Mu",
"Benrong",
""
]
] | In this paper, the thermodynamics and the stability of horizon of the charged AdS black hole surrounded by quintessence and cloud of strings in d-dimensional spacetime are studied via the scalar field scattering and the charged particle absorption. The cosmological constant is interpreted as a thermodynamics variable. ... |
1406.0957 | Kohkichi Konno | Kohkichi Konno and Rohta Takahashi | Scalar field excited around a rapidly rotating black hole in
Chern-Simons modified gravity | 10 pages, 5 figures; Revised version, accepted for publication in PRD | Phys. Rev. D 90, 064011 (2014) | 10.1103/PhysRevD.90.064011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a Chern-Simons (CS) scalar field around a rapidly rotating black
hole in dynamical CS modified gravity. The CS correction can be obtained
perturbatively by considering the Kerr spacetime to be the background. We
obtain the CS scalar field solution around the black hole analytically and
numerically, assumin... | [
{
"created": "Wed, 4 Jun 2014 07:18:07 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Aug 2014 12:55:44 GMT",
"version": "v2"
}
] | 2014-09-10 | [
[
"Konno",
"Kohkichi",
""
],
[
"Takahashi",
"Rohta",
""
]
] | We discuss a Chern-Simons (CS) scalar field around a rapidly rotating black hole in dynamical CS modified gravity. The CS correction can be obtained perturbatively by considering the Kerr spacetime to be the background. We obtain the CS scalar field solution around the black hole analytically and numerically, assuming ... |
0812.5018 | Carlo Rovelli | Emanuele Alesci, Eugenio Bianchi, Carlo Rovelli | LQG propagator: III. The new vertex | 9 pages | Class.Quant.Grav.26:215001,2009 | 10.1088/0264-9381/26/21/215001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the first article of this series, we pointed out a difficulty in the
attempt to derive the low-energy behavior of the graviton two-point function,
from the loop-quantum-gravity dynamics defined by the Barrett-Crane vertex
amplitude. Here we show that this difficulty disappears when using the
corrected vertex ampli... | [
{
"created": "Tue, 30 Dec 2008 06:53:00 GMT",
"version": "v1"
}
] | 2010-01-08 | [
[
"Alesci",
"Emanuele",
""
],
[
"Bianchi",
"Eugenio",
""
],
[
"Rovelli",
"Carlo",
""
]
] | In the first article of this series, we pointed out a difficulty in the attempt to derive the low-energy behavior of the graviton two-point function, from the loop-quantum-gravity dynamics defined by the Barrett-Crane vertex amplitude. Here we show that this difficulty disappears when using the corrected vertex amplitu... |
gr-qc/9801021 | Yasusada Nambu | Yasusada Nambu and Atsushi Taruya | Solutions of gauge invariant cosmological perturbations in
long-wavelength limit | 17 pages, will appear in Classical and Quantum Gravity | Class.Quant.Grav. 15 (1998) 2761-2772 | 10.1088/0264-9381/15/9/021 | DPNU-97-48 | gr-qc astro-ph | null | We investigate gauge invariant cosmological perturbations in a spatially flat
Friedman-Robertson-Walker universe with scalar fields. It is well known that
the evolution equation for the gauge invariant quantities has exact solutions
in the long-wavelength limit. We find that these gauge invariant solutions can
be obt... | [
{
"created": "Fri, 9 Jan 1998 05:22:07 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jul 1998 07:12:33 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Nambu",
"Yasusada",
""
],
[
"Taruya",
"Atsushi",
""
]
] | We investigate gauge invariant cosmological perturbations in a spatially flat Friedman-Robertson-Walker universe with scalar fields. It is well known that the evolution equation for the gauge invariant quantities has exact solutions in the long-wavelength limit. We find that these gauge invariant solutions can be obtai... |
1910.07989 | Bibhas Majhi Ranjan | Surojit Dalui, Bibhas Ranjan Majhi, Pankaj Mishra | Horizon induces instability locally and creates quantum thermality | Modified version, to appear in Phys. Rev. D | Phys. Rev. D 102, 044006 (2020) | 10.1103/PhysRevD.102.044006 | null | gr-qc hep-th nlin.CD quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classical Hamiltonian for a chargeless and massless particle in a very
near horizon region is shown to be of the form $H\sim xp$ as long as radial
motion is concerned. This is demonstrated explicitly for static spherically
symmetric black hole and also found to be applicable for specific choice of
radial trajecto... | [
{
"created": "Thu, 17 Oct 2019 16:02:37 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Dec 2019 10:35:43 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Jul 2020 15:58:45 GMT",
"version": "v3"
}
] | 2020-08-06 | [
[
"Dalui",
"Surojit",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
],
[
"Mishra",
"Pankaj",
""
]
] | The classical Hamiltonian for a chargeless and massless particle in a very near horizon region is shown to be of the form $H\sim xp$ as long as radial motion is concerned. This is demonstrated explicitly for static spherically symmetric black hole and also found to be applicable for specific choice of radial trajectori... |
1408.5843 | Mohammed M. Khalil | Ahmed Farag Ali, Mohammed M. Khalil | A Proposal for Testing Gravity's Rainbow | 6 pages, no figures, to appear in Europhysics Letters | EPL 110 (2015) 20009 | 10.1209/0295-5075/110/20009 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various approaches to quantum gravity such as string theory, loop quantum
gravity and Horava-Lifshitz gravity predict modifications of the
energy-momentum dispersion relation. Magueijo and Smolin incorporated the
modified dispersion relation (MDR) with the general theory of relativity to
yield a theory of gravity's r... | [
{
"created": "Mon, 25 Aug 2014 17:38:58 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Apr 2015 11:23:15 GMT",
"version": "v2"
}
] | 2015-05-12 | [
[
"Ali",
"Ahmed Farag",
""
],
[
"Khalil",
"Mohammed M.",
""
]
] | Various approaches to quantum gravity such as string theory, loop quantum gravity and Horava-Lifshitz gravity predict modifications of the energy-momentum dispersion relation. Magueijo and Smolin incorporated the modified dispersion relation (MDR) with the general theory of relativity to yield a theory of gravity's rai... |
gr-qc/0304042 | Adam D. Helfer | Adam D. Helfer | Do black holes radiate? | review article, 80 pp., 3 included eps figures, IOP macros (included) | Rept.Prog.Phys. 66 (2003) 943-1008 | 10.1088/0034-4885/66/6/202 | null | gr-qc astro-ph hep-th | null | The prediction that black holes radiate due to quantum effects is often
considered one of the most secure in quantum field theory in curved space-time.
Yet this prediction rests on two dubious assumptions: that ordinary physics may
be applied to vacuum fluctuations at energy scales increasing exponentially
without bo... | [
{
"created": "Wed, 9 Apr 2003 20:09:25 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Helfer",
"Adam D.",
""
]
] | The prediction that black holes radiate due to quantum effects is often considered one of the most secure in quantum field theory in curved space-time. Yet this prediction rests on two dubious assumptions: that ordinary physics may be applied to vacuum fluctuations at energy scales increasing exponentially without boun... |
2311.09943 | Alessandro Fabbri | Roberto Balbinot and Alessandro Fabbri | The Unruh vacuum and the in-vacuum in the Reissner-Nordstr\"om spacetime | one misprint corrected. 22 pages, 6 figures. Final version. Paper
dedicated to Richard Kerner in the occasion of his 80th birthday | Universe 2024, 10(1), 18 | 10.3390/universe10010018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Unruh vacuum is widely used as quantum state to describe black hole
evaporation since near the horizon it reproduces the physical state of a
quantum field, the so called in-vacuum, in the case the black hole is formed by
gravitational collapse. We examine the relation between these two quantum
states in the backg... | [
{
"created": "Thu, 16 Nov 2023 14:52:53 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Dec 2023 13:24:08 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Jan 2024 11:47:13 GMT",
"version": "v3"
}
] | 2024-01-23 | [
[
"Balbinot",
"Roberto",
""
],
[
"Fabbri",
"Alessandro",
""
]
] | The Unruh vacuum is widely used as quantum state to describe black hole evaporation since near the horizon it reproduces the physical state of a quantum field, the so called in-vacuum, in the case the black hole is formed by gravitational collapse. We examine the relation between these two quantum states in the backgro... |
1507.06463 | Yafet Sanchez Sanchez | Yafet Sanchez Sanchez and James A. Vickers | Generalised hyperbolicity in spacetimes with Lipschitz regularity | null | Journal of Mathematical Physics 58, 022502 (2017) | 10.1063/1.4975216 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we obtain general conditions under which the wave equation is
well-posed in spacetimes with metrics of Lipschitz regularity. In particular,
the results can be applied to spacetimes where there is a loss of regularity on
a hypersurface such as shell-crossing singularities, thin shells of matter and
surf... | [
{
"created": "Thu, 23 Jul 2015 12:08:58 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Jan 2016 18:35:52 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Oct 2016 17:15:20 GMT",
"version": "v3"
}
] | 2017-02-14 | [
[
"Sanchez",
"Yafet Sanchez",
""
],
[
"Vickers",
"James A.",
""
]
] | In this paper, we obtain general conditions under which the wave equation is well-posed in spacetimes with metrics of Lipschitz regularity. In particular, the results can be applied to spacetimes where there is a loss of regularity on a hypersurface such as shell-crossing singularities, thin shells of matter and surfac... |
2005.03164 | Joan Sola | Cristian Moreno-Pulido and Joan Sola | Running vacuum in quantum field theory in curved spacetime:
renormalizing $\rho_{vac}$ without $\sim m^4$ terms | Matches the published version | Eur. Phys. J. C 80, 692 (2020) | 10.1140/epjc/s10052-020-8238-6 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $\Lambda$-term in Einstein's equations is a fundamental building block of
the `concordance' $\Lambda$CDM model of cosmology. Even though the model is not
free of fundamental problems, they have not been circumvented by any
alternative dark energy proposal either. Here we stick to the $\Lambda$-term,
but we conten... | [
{
"created": "Wed, 6 May 2020 22:55:32 GMT",
"version": "v1"
},
{
"created": "Mon, 11 May 2020 17:58:57 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Jul 2020 12:29:01 GMT",
"version": "v3"
},
{
"created": "Thu, 6 Aug 2020 07:57:13 GMT",
"version": "v4"
}
] | 2020-08-07 | [
[
"Moreno-Pulido",
"Cristian",
""
],
[
"Sola",
"Joan",
""
]
] | The $\Lambda$-term in Einstein's equations is a fundamental building block of the `concordance' $\Lambda$CDM model of cosmology. Even though the model is not free of fundamental problems, they have not been circumvented by any alternative dark energy proposal either. Here we stick to the $\Lambda$-term, but we contend ... |
1705.09208 | Lee Smolin | Lee Smolin | What are we missing in our search for quantum gravity? | Latex, 21 pages. For Foundations of Mathematics and Physics : an
IJGMMP special issue | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some reflections are presented on the state of the search for a quantum
theory of gravity. I discuss diverse regimes of possible quantum gravitational
phenomenon, some well explored, some novel.
| [
{
"created": "Thu, 25 May 2017 14:56:50 GMT",
"version": "v1"
}
] | 2017-05-26 | [
[
"Smolin",
"Lee",
""
]
] | Some reflections are presented on the state of the search for a quantum theory of gravity. I discuss diverse regimes of possible quantum gravitational phenomenon, some well explored, some novel. |
2101.02219 | Shahar Hod | Shahar Hod | Gauss-Bonnet black holes supporting massive scalar field configurations:
The large-mass regime | 5 pages | The European Physical Journal C 79, 966 (2019) | 10.1140/epjc/s10052-019-7494-9 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | It has recently been demonstrated that black holes with spatially regular
horizons can support external scalar fields (scalar hairy configurations) which
are non-minimally coupled to the Gauss-Bonnet invariant of the curved
spacetime. The composed black-hole-scalar-field system is characterized by a
critical existenc... | [
{
"created": "Wed, 6 Jan 2021 19:00:03 GMT",
"version": "v1"
}
] | 2021-01-13 | [
[
"Hod",
"Shahar",
""
]
] | It has recently been demonstrated that black holes with spatially regular horizons can support external scalar fields (scalar hairy configurations) which are non-minimally coupled to the Gauss-Bonnet invariant of the curved spacetime. The composed black-hole-scalar-field system is characterized by a critical existence ... |
0906.0096 | Alessandro Nagar | Thibault Damour and Alessandro Nagar | Relativistic tidal properties of neutron stars | 21 pages, 10 figures. Matches the published version | Phys.Rev.D80:084035,2009 | 10.1103/PhysRevD.80.084035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the various linear responses of neutron stars to external
relativistic tidal fields. We focus on three different tidal responses,
associated to three different tidal coefficients: (i) a gravito-electric-type
coefficient G\mu_\ell=[length]^{2\ell+1} measuring the \ell^{th}-order mass
multipolar moment GM_{a_1... | [
{
"created": "Sat, 30 May 2009 17:22:37 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Dec 2009 14:45:12 GMT",
"version": "v2"
}
] | 2009-12-03 | [
[
"Damour",
"Thibault",
""
],
[
"Nagar",
"Alessandro",
""
]
] | We study the various linear responses of neutron stars to external relativistic tidal fields. We focus on three different tidal responses, associated to three different tidal coefficients: (i) a gravito-electric-type coefficient G\mu_\ell=[length]^{2\ell+1} measuring the \ell^{th}-order mass multipolar moment GM_{a_1..... |
0709.2253 | Yasuo Ezawa | T. Ezawa, H. Iwasaki, A. Nakamura, Y. Ohkuwa and T. Yano | Gravitational waves originated before compactification in Kaluza-Klein
theory | 10 pages, Dimension of the internal space is generalized to n | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the propagation of multidimensional gravitational waves
generated before compactification and observes today as 4-dimensional
gravitational waves and gauge fields by generalizing the investigation of
Alesci and Montani(AM) to the case where the internal space is an n-sphere. We
also derive the 4-dimens... | [
{
"created": "Fri, 14 Sep 2007 10:34:30 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Apr 2009 04:05:47 GMT",
"version": "v2"
},
{
"created": "Sat, 13 Jun 2009 08:59:32 GMT",
"version": "v3"
}
] | 2009-06-13 | [
[
"Ezawa",
"T.",
""
],
[
"Iwasaki",
"H.",
""
],
[
"Nakamura",
"A.",
""
],
[
"Ohkuwa",
"Y.",
""
],
[
"Yano",
"T.",
""
]
] | We investigate the propagation of multidimensional gravitational waves generated before compactification and observes today as 4-dimensional gravitational waves and gauge fields by generalizing the investigation of Alesci and Montani(AM) to the case where the internal space is an n-sphere. We also derive the 4-dimensio... |
0707.3222 | Theodore A. Jacobson | Ted Jacobson | When is g_{tt} g_{rr} = -1? | 3 pages; v2: references, and discussion of Born-Infeld solutions and
O(3) and string hedgehogs added; 4 pages; v3: slight editing; comment added
that condition implies radial pressure is negative of energy density; version
to appear in CQG | Class.Quant.Grav.24:5717-5719,2007 | 10.1088/0264-9381/24/22/N02 | null | gr-qc hep-th | null | The Schwarzschild metric, its Reissner-Nordstrom-de Sitter generalizations to
higher dimensions, and some further generalizations all share the feature that
g_{tt} g_{rr}=-1 in Schwarzschild-like coordinates. In this pedagogical note we
trace this feature to the condition that the Ricci tensor (and stress-energy
tens... | [
{
"created": "Sat, 21 Jul 2007 18:28:42 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Sep 2007 14:27:55 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Sep 2007 21:35:13 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Jacobson",
"Ted",
""
]
] | The Schwarzschild metric, its Reissner-Nordstrom-de Sitter generalizations to higher dimensions, and some further generalizations all share the feature that g_{tt} g_{rr}=-1 in Schwarzschild-like coordinates. In this pedagogical note we trace this feature to the condition that the Ricci tensor (and stress-energy tensor... |
gr-qc/0306090 | Dilip Ranganathan | D. Ranganathan | A self consistent solution to the Einstein Maxwell Dirac Equations | Revtex4, 5 pages. Corrected typos | null | null | null | gr-qc math-ph math.MP quant-ph | null | A self consistent solution to Dirac equation in a Kerr Newman space-time with
$M^2 > a^2 + Q^2$ is presented for the case when the Dirac particle is the
source of the curvature and the electromagnetic field. The solution is
localised, continuous everywhere and valid only for a special choice of the
parameters appeari... | [
{
"created": "Thu, 19 Jun 2003 15:41:59 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jun 2003 05:00:34 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ranganathan",
"D.",
""
]
] | A self consistent solution to Dirac equation in a Kerr Newman space-time with $M^2 > a^2 + Q^2$ is presented for the case when the Dirac particle is the source of the curvature and the electromagnetic field. The solution is localised, continuous everywhere and valid only for a special choice of the parameters appearing... |
1203.6263 | Thomas Buchert | Thomas Buchert and Matthias Ostermann | Lagrangian theory of structure formation in relativistic cosmology I:
Lagrangian framework and definition of a nonperturbative approximation | 21 pages, content matches published version in PRD, discussion on
singularities added, some formulas added, some rewritten and some corrected | Phys.Rev.D86:023520,2012 | 10.1103/PhysRevD.86.023520 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this first paper we present a Lagrangian framework for the description of
structure formation in general relativity, restricting attention to
irrotational dust matter. As an application we present a self-contained
derivation of a general-relativistic analogue of Zel'dovich's approximation for
the description of st... | [
{
"created": "Wed, 28 Mar 2012 13:35:08 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jul 2012 17:47:19 GMT",
"version": "v2"
}
] | 2012-07-24 | [
[
"Buchert",
"Thomas",
""
],
[
"Ostermann",
"Matthias",
""
]
] | In this first paper we present a Lagrangian framework for the description of structure formation in general relativity, restricting attention to irrotational dust matter. As an application we present a self-contained derivation of a general-relativistic analogue of Zel'dovich's approximation for the description of stru... |
gr-qc/0509094 | Stuart L. Shapiro | Stuart L. Shapiro | Numerical Relativity at the Frontier | to appear in ``The Next Chapter in Einstein's Legacy'', Proceedings
of YKIS 2005, Kyoto, Japan, eds M. Sasaki, J. Soda and T. Tanaka, in Progress
of Theoretical Physics Suppl, in press (2006) | Prog.Theor.Phys.Suppl. 163 (2006) 100-119 | 10.1143/PTPS.163.100 | null | gr-qc astro-ph | null | Numerical relativity is an essential tool for solving Einstein's equations of
general relativity for dynamical systems characterized by high velocities and
strong gravitational fields. The implementation of new algorithms that can
solve these nonlinear equations in 3+1 dimensions has enabled us to tackle many
long-st... | [
{
"created": "Fri, 23 Sep 2005 20:02:12 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Shapiro",
"Stuart L.",
""
]
] | Numerical relativity is an essential tool for solving Einstein's equations of general relativity for dynamical systems characterized by high velocities and strong gravitational fields. The implementation of new algorithms that can solve these nonlinear equations in 3+1 dimensions has enabled us to tackle many long-stan... |
2401.17572 | Dr. Goutam Manna | Bivash Majumder, Saibal Ray and Goutam Manna | Null geodesic structure for the Barriola-Vilenkin spacetime via
$k$-essence | 10pages, 5figures, Accepted from IJMPD | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Based on the work of Chandrasekhar [{\it The Mathematical Theory of Black
Holes, Oxford Univ. Press (1992)}], we investigate the null geodesic structure
of the emergent Barriola-Vilenkin spacetime in the context of {\bf k-}essence
theory. For {\bf k-}essence, the emergent gravity metric is a one-to-one
correspondence... | [
{
"created": "Wed, 31 Jan 2024 03:33:42 GMT",
"version": "v1"
}
] | 2024-02-01 | [
[
"Majumder",
"Bivash",
""
],
[
"Ray",
"Saibal",
""
],
[
"Manna",
"Goutam",
""
]
] | Based on the work of Chandrasekhar [{\it The Mathematical Theory of Black Holes, Oxford Univ. Press (1992)}], we investigate the null geodesic structure of the emergent Barriola-Vilenkin spacetime in the context of {\bf k-}essence theory. For {\bf k-}essence, the emergent gravity metric is a one-to-one correspondence w... |
1210.7115 | Valeri Frolov P | Valeri P. Frolov | Black holes, hidden symmetry and complete integrability: Brief Review | Brief version of the talk presented at the Conference: "Relativity
and Gravitation: 100 years after Einstein in Prague", Prague, 25-29 June,
2012. Prepared for the Proceedings of this conference | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper contains a brief review of the remarkable properties of higher
dimensional rotating black holes with the spherical topology of the horizon. We
demonstrate that these properties are connected with and generated by a special
geometrical object, the Principal Conformal Killing-Yano tensor (PCKYT). The
most ge... | [
{
"created": "Fri, 26 Oct 2012 12:24:27 GMT",
"version": "v1"
}
] | 2012-10-29 | [
[
"Frolov",
"Valeri P.",
""
]
] | This paper contains a brief review of the remarkable properties of higher dimensional rotating black holes with the spherical topology of the horizon. We demonstrate that these properties are connected with and generated by a special geometrical object, the Principal Conformal Killing-Yano tensor (PCKYT). The most gene... |
1409.5823 | Abhay Ashtekar | Abhay Ashtekar, Beverly K. Berger, James Isenberg and Malcolm A. H.
MacCallum | General Relativity and Gravitation: A Centennial Perspective | 37 pages | null | null | IGC-14/09-5 | gr-qc astro-ph.CO astro-ph.HE hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To commemorate the 100th anniversary of general relativity, the International
Society on General Relativity and Gravitation (ISGRG) commissioned a Centennial
Volume, edited by the authors of this article. We jointly wrote introductions
to the four Parts of the Volume which are collected here. Our goal is to
provide a... | [
{
"created": "Fri, 19 Sep 2014 22:16:24 GMT",
"version": "v1"
}
] | 2014-09-23 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Berger",
"Beverly K.",
""
],
[
"Isenberg",
"James",
""
],
[
"MacCallum",
"Malcolm A. H.",
""
]
] | To commemorate the 100th anniversary of general relativity, the International Society on General Relativity and Gravitation (ISGRG) commissioned a Centennial Volume, edited by the authors of this article. We jointly wrote introductions to the four Parts of the Volume which are collected here. Our goal is to provide a b... |
gr-qc/0610031 | David Delphenich | D. H. Delphenich | On linear electromagnetic constitutive laws that define almost-complex
structures | 14 pages, accepted by Annalen der Physik | Annalen Phys. 16 (2007) 207-217 | 10.1002/andp.200610227 | null | gr-qc physics.optics | null | It is shown that not all linear electromagnetic constitutive laws will define
almost-complex structure on the bundle of 2-forms on the spacetime manifold
when composed with the Poincare duality isomorphism, but only a restricted
class of them that includes linear spatially isotropic and some bi-isotropic
laws. Althou... | [
{
"created": "Sun, 8 Oct 2006 21:32:31 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Delphenich",
"D. H.",
""
]
] | It is shown that not all linear electromagnetic constitutive laws will define almost-complex structure on the bundle of 2-forms on the spacetime manifold when composed with the Poincare duality isomorphism, but only a restricted class of them that includes linear spatially isotropic and some bi-isotropic laws. Although... |
0912.2935 | Luca Lusanna | Luca Lusanna (INFN, Firenze) | Post-Minkowskian Gravity: Dark Matter as a Relativistic Inertial Effect? | 15 pages. Talk at the {\it 1st Mediterranean Conference in Classical
and Quantum Gravity}, held in the Orthodox Academy of Crete in Kolymbari
(Greece) from Monday, September 14th to Friday, September 18th, 2009 | J.Phys.Conf.Ser.222:012016,2010 | 10.1088/1742-6596/222/1/012016 | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A review is given of the theory of non-inertial frames (with the associated
inertial effects and the study of the non-relativistic limit) in Minkowski
space-time, of parametrized Minkowski theories and of the rest-frame instant
form of dynamics for isolated systems admitting a Lagrangian description. The
relevance an... | [
{
"created": "Tue, 15 Dec 2009 15:37:09 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Lusanna",
"Luca",
"",
"INFN, Firenze"
]
] | A review is given of the theory of non-inertial frames (with the associated inertial effects and the study of the non-relativistic limit) in Minkowski space-time, of parametrized Minkowski theories and of the rest-frame instant form of dynamics for isolated systems admitting a Lagrangian description. The relevance and ... |
0803.3018 | James Lindesay | James Lindesay | An Exploration of the Physics of Spherically Symmetric Dynamic Horizons | Invited talk presented at the 2008 Annual Conference of the National
Society of Black Physicists and National Society of Hispanic Physicists, Feb.
20-23, Washington, D.C., 37 pages, 12 figures, symbol fonts in figures
corrected | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Geometries with horizons offer insights into relationships between general
relativity and quantum physics. For static spherically symmetric space-times,
the event horizon is coincident with a coordinate anomaly that introduces
complications in descriptions of near horizon physics. Naive introduction of
dynamics using... | [
{
"created": "Thu, 20 Mar 2008 15:49:56 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Mar 2008 21:11:34 GMT",
"version": "v2"
}
] | 2008-03-25 | [
[
"Lindesay",
"James",
""
]
] | Geometries with horizons offer insights into relationships between general relativity and quantum physics. For static spherically symmetric space-times, the event horizon is coincident with a coordinate anomaly that introduces complications in descriptions of near horizon physics. Naive introduction of dynamics using c... |
1201.2340 | Gary Gibbons | G. W. Gibbons | What is the Shape of a Black Hole? | 11 pages, no figures Written version of an invited lecture talk given
at the the International Fall Workshop on Geometry and Physics held In ICMAT,
MADRID (Spain), from August 31 to September 3 2011 and to appear in the
Proceedings | null | 10.1063/1.4733363 | DAMTP-2012-3 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A brief, and certainly not exhaustive, survey is provided of some recent
results and conjectures in four and higher spacetime dimensions, such as the
Hoop Conjecture, relating the geometry of event horizons to dynamical
quantities such as the total energy or mass of the spacetime containng the
black hole. As a measur... | [
{
"created": "Wed, 11 Jan 2012 16:13:22 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Gibbons",
"G. W.",
""
]
] | A brief, and certainly not exhaustive, survey is provided of some recent results and conjectures in four and higher spacetime dimensions, such as the Hoop Conjecture, relating the geometry of event horizons to dynamical quantities such as the total energy or mass of the spacetime containng the black hole. As a measure ... |
2210.06396 | Jamie Bamber | Jamie Bamber | Fifth forces and frame invariance | 12 pages, 1 figure | null | 10.1103/PhysRevD.107.024013 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I discuss how one can apply the covariant formalism developed by Vilkovisky
and DeWitt to obtain frame invariant fifth force calculations for scalar-tensor
theories. Fifth forces are severely constrained by astrophysical measurements.
It was shown previously that for scale-invariant Higgs-dilaton gravity, in a
partic... | [
{
"created": "Wed, 12 Oct 2022 16:48:53 GMT",
"version": "v1"
}
] | 2023-01-25 | [
[
"Bamber",
"Jamie",
""
]
] | I discuss how one can apply the covariant formalism developed by Vilkovisky and DeWitt to obtain frame invariant fifth force calculations for scalar-tensor theories. Fifth forces are severely constrained by astrophysical measurements. It was shown previously that for scale-invariant Higgs-dilaton gravity, in a particul... |
1507.06236 | Bijan Saha Dr. | Bijan Saha | Spinor Field with Polynomial Nonlinearity in LRS Bianchi type-I
spacetime | 9 pages, 4 figures. arXiv admin note: substantial text overlap with
arXiv:1409.4993; text overlap with arXiv:1507.03847 | Can. J. Phys. (2016) 94: 116 | 10.1139/cjp-2014-0306 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the scope of Bianchi type-I cosmological model the role of spinor
field on the evolution of the Universe is investigated. In doing so we have
considered a polynomial type of nonlinearity. It is found that depending on the
sign of self-coupling constant the model allows either accelerated mode of
expansion or o... | [
{
"created": "Wed, 22 Jul 2015 16:03:37 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Oct 2015 11:06:37 GMT",
"version": "v2"
}
] | 2016-06-29 | [
[
"Saha",
"Bijan",
""
]
] | Within the scope of Bianchi type-I cosmological model the role of spinor field on the evolution of the Universe is investigated. In doing so we have considered a polynomial type of nonlinearity. It is found that depending on the sign of self-coupling constant the model allows either accelerated mode of expansion or osc... |
gr-qc/0611087 | Grigori Kirilin | G.G. Kirilin | Reparametrization invariance of the classical metric | 4 pages | null | null | null | gr-qc | null | There is a statement on the parametrization dependence of the classical
metric in the recent paper of N.E.J. Bjerrum-Bohr, J.F. Donoghue, B.R.
Holstein, gr-qc/0610096. I completely disagree with this statement. Here I show
reparametrization invariance of the classical metric.
| [
{
"created": "Thu, 16 Nov 2006 12:01:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kirilin",
"G. G.",
""
]
] | There is a statement on the parametrization dependence of the classical metric in the recent paper of N.E.J. Bjerrum-Bohr, J.F. Donoghue, B.R. Holstein, gr-qc/0610096. I completely disagree with this statement. Here I show reparametrization invariance of the classical metric. |
1110.1154 | Tim Taves Mr. | T. Taves, C. D. Leonard, G. Kunstatter, R. B. Mann | Hamiltonian Formulation of Scalar Field Collapse in Einstein Gauss
Bonnet Gravity | 14 pages, 0 figures | null | 10.1088/0264-9381/29/1/015012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the Hamiltonian for spherically symmetric scalar field collapse in
Einstein-Gauss-Bonnet gravity in D dimensions using slicings that are regular
across future horizons. We first reduce the Lagrangian to two dimensions using
spherical symmetry. We then show that choosing the spatial coordinate to be a
funct... | [
{
"created": "Thu, 6 Oct 2011 04:36:18 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Oct 2011 20:23:47 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Taves",
"T.",
""
],
[
"Leonard",
"C. D.",
""
],
[
"Kunstatter",
"G.",
""
],
[
"Mann",
"R. B.",
""
]
] | We compute the Hamiltonian for spherically symmetric scalar field collapse in Einstein-Gauss-Bonnet gravity in D dimensions using slicings that are regular across future horizons. We first reduce the Lagrangian to two dimensions using spherical symmetry. We then show that choosing the spatial coordinate to be a functio... |
1306.6403 | Aharon Davidson | Aharon Davidson and Ben Yellin | Thermal Hawking Broadening and Statistical Entropy of Black Hole Wave
Packet | 5 twocolumn pages + 2 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum mechanical structure of Schwarzschild black hole is probed, in
the mini super spacetime, by means of a non-singular minimal uncertainty
Hartle-Hawking wave packet. The Compton width of the microstate probability
distribution is translated into a thermal Hawking broadening of the mass
spectrum. The statist... | [
{
"created": "Thu, 27 Jun 2013 04:01:55 GMT",
"version": "v1"
}
] | 2013-06-28 | [
[
"Davidson",
"Aharon",
""
],
[
"Yellin",
"Ben",
""
]
] | The quantum mechanical structure of Schwarzschild black hole is probed, in the mini super spacetime, by means of a non-singular minimal uncertainty Hartle-Hawking wave packet. The Compton width of the microstate probability distribution is translated into a thermal Hawking broadening of the mass spectrum. The statistic... |
gr-qc/0007004 | Anzhong Wang | J.F. Villas da Rocha and Anzhong Wang | Collapsing Perfect Fluid in Higher Dimensional Spherical Spacetimes | Class. Quantum Grav. 17 (2000) 2589-2596 | null | 10.1088/0264-9381/17/13/310 | null | gr-qc | null | The general metric for N-dimensional spherically symmetric and conformally
flat spacetimes is given, and all the homogeneous and isotropic solutions for a
perfect fluid with the equation of state $p = \alpha \rho$ are found. These
solutions are then used to model the gravitational collapse of a compact ball.
It is fo... | [
{
"created": "Tue, 4 Jul 2000 16:18:11 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Jan 2004 23:42:25 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"da Rocha",
"J. F. Villas",
""
],
[
"Wang",
"Anzhong",
""
]
] | The general metric for N-dimensional spherically symmetric and conformally flat spacetimes is given, and all the homogeneous and isotropic solutions for a perfect fluid with the equation of state $p = \alpha \rho$ are found. These solutions are then used to model the gravitational collapse of a compact ball. It is foun... |
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