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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1701.01032 | Sumanta Chakraborty | Sumanta Chakraborty and Soumitra SenGupta | Gravity stabilizes itself | Revised Version, 19 pages, no figures | Eur. Phys. J. C 77, 573 (2017) | 10.1140/epjc/s10052-017-5138-5 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a possible resolution to the stabilization of an extra spatial
dimension (radion) can be obtained solely in the context of gravitational
dynamics itself without the necessity of introducing any external stabilizing
field. In this scenario the stabilized value of the radion field gets
determined in terms ... | [
{
"created": "Fri, 30 Dec 2016 21:00:28 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Aug 2017 04:43:05 GMT",
"version": "v2"
}
] | 2017-08-30 | [
[
"Chakraborty",
"Sumanta",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | We show that a possible resolution to the stabilization of an extra spatial dimension (radion) can be obtained solely in the context of gravitational dynamics itself without the necessity of introducing any external stabilizing field. In this scenario the stabilized value of the radion field gets determined in terms of... |
gr-qc/0403034 | Mihalis Dafermos | Mihalis Dafermos and Igor Rodnianski | A note on boundary value problems for black hole evolutions | 8 pages, 3 figures | null | null | null | gr-qc | null | In recent work of Allen at. al., heuristic and numerical arguments were put
forth to suggest that boundary value problems for black hole evolution, where
an appropriate Sommerfeld radiation condition is imposed, would fail to produce
Price law tails. The interest in this issue lies in its possible implications
for nu... | [
{
"created": "Mon, 8 Mar 2004 18:12:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dafermos",
"Mihalis",
""
],
[
"Rodnianski",
"Igor",
""
]
] | In recent work of Allen at. al., heuristic and numerical arguments were put forth to suggest that boundary value problems for black hole evolution, where an appropriate Sommerfeld radiation condition is imposed, would fail to produce Price law tails. The interest in this issue lies in its possible implications for nume... |
2204.00662 | Abhirup Ghosh | Abhirup Ghosh (for the LIGO Scientific--Virgo--Kagra Collaborations) | Summary of Tests of General Relativity with GWTC-3 | 8 pages, 3 figures, contribution to the 2022 Gravitation session of
the 56th Rencontres de Moriond; summary of arXiv:2112.06861 | null | null | LIGO-P2200097 | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observations of gravitational waves (GWs) by the advanced LIGO--Virgo
detectors provide us with ground breaking opportunities to test predictions of
Einstein's theory of general relativity (GR) in the strong field regime. In
this article, we summarise the nine tests of GR performed on the new GW signals
included in t... | [
{
"created": "Fri, 1 Apr 2022 19:01:26 GMT",
"version": "v1"
}
] | 2022-04-05 | [
[
"Ghosh",
"Abhirup",
"",
"for the LIGO Scientific--Virgo--Kagra Collaborations"
]
] | Observations of gravitational waves (GWs) by the advanced LIGO--Virgo detectors provide us with ground breaking opportunities to test predictions of Einstein's theory of general relativity (GR) in the strong field regime. In this article, we summarise the nine tests of GR performed on the new GW signals included in the... |
1109.3010 | Muhammad Sharif | M. Sharif and H. Rizwana Kausar | Effects of f(R) Model on the Dynamical Instability of Expansionfree
Gravitational Collapse | 26 pages, no figure. arXiv admin note: text overlap with
arXiv:1108.2666 | JCAP 07(2011)022 | 10.1088/1475-7516/2011/07/022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark energy models based on f(R) theory have been extensively studied in
literature to realize the late time acceleration. In this paper, we have chosen
a viable f(R) model and discussed its effects on the dynamical instability of
expansionfree fluid evolution generating a central vacuum cavity. For this
purpose, con... | [
{
"created": "Wed, 14 Sep 2011 07:42:30 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Sharif",
"M.",
""
],
[
"Kausar",
"H. Rizwana",
""
]
] | Dark energy models based on f(R) theory have been extensively studied in literature to realize the late time acceleration. In this paper, we have chosen a viable f(R) model and discussed its effects on the dynamical instability of expansionfree fluid evolution generating a central vacuum cavity. For this purpose, contr... |
1206.2702 | Shin'ichi Nojiri | E. Elizalde, A.N. Makarenko, S. Nojiri, V.V. Obukhov, and S.D.
Odintsov | Multiple $\Lambda$CDM cosmology with string landscape features and
future singularities | LaTeX 11 pages, 10 figures | null | 10.1007/s10509-012-1339-4 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Multiple $\Lambda$CDM cosmology is studied in a way that is formally a
classical analog of the Casimir effect. Such cosmology corresponds to a
time-dependent dark fluid model or, alternatively, to its scalar field
presentation, and it motivated by the string landscape picture. The future
evolution of the several dark... | [
{
"created": "Wed, 13 Jun 2012 02:29:45 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Elizalde",
"E.",
""
],
[
"Makarenko",
"A. N.",
""
],
[
"Nojiri",
"S.",
""
],
[
"Obukhov",
"V. V.",
""
],
[
"Odintsov",
"S. D.",
""
]
] | Multiple $\Lambda$CDM cosmology is studied in a way that is formally a classical analog of the Casimir effect. Such cosmology corresponds to a time-dependent dark fluid model or, alternatively, to its scalar field presentation, and it motivated by the string landscape picture. The future evolution of the several dark e... |
gr-qc/9804053 | null | S. Capozziello, R. de Ritis, A.A. Marino | Recovering the effective cosmological constant in extended gravity
theories | 24 pages, Latex, submitted to Gen.Rel.and Grav | Gen.Rel.Grav.30:1247-1272,1998 | 10.1023/A:1026651129626 | null | gr-qc | null | In the framework of extended gravity theories, we discuss the meaning of a
time dependent "cosmological constant" and give a set of conditions to recover
asymptotic de Sitter behaviour for a class of cosmological models independently
of initial data. To this purpose we introduce a time-dependent (effective)
quantity ... | [
{
"created": "Wed, 22 Apr 1998 10:28:45 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Capozziello",
"S.",
""
],
[
"de Ritis",
"R.",
""
],
[
"Marino",
"A. A.",
""
]
] | In the framework of extended gravity theories, we discuss the meaning of a time dependent "cosmological constant" and give a set of conditions to recover asymptotic de Sitter behaviour for a class of cosmological models independently of initial data. To this purpose we introduce a time-dependent (effective) quantity wh... |
gr-qc/0603124 | Jerome Perez | Jerome Perez | Dynamics of Anisotropic Universes | 12 pages, 6 figures, Proceedings of the Albert Einstein Century
International Conference, held in Paris, France, July 18-22, 2005. to be
published in AIP | null | 10.1063/1.2399648 | null | gr-qc | null | We present a general study of the dynamical properties of Anisotropic Bianchi
Universes in the context of Einstein General Relativity. Integrability results
using Kovalevskaya exponents are reported and connected to general knowledge
about Bianchi dynamics. Finally, dynamics toward singularity in Bianchi type
VIII an... | [
{
"created": "Thu, 30 Mar 2006 12:51:31 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Perez",
"Jerome",
""
]
] | We present a general study of the dynamical properties of Anisotropic Bianchi Universes in the context of Einstein General Relativity. Integrability results using Kovalevskaya exponents are reported and connected to general knowledge about Bianchi dynamics. Finally, dynamics toward singularity in Bianchi type VIII and ... |
1810.00978 | Alexander B. Balakin | Alexander B. Balakin and Dmitry E. Groshev | Polarization and stratification of axionically active plasma in a dyon
magnetosphere | 20 pages, 4 figures, the revised version published in Phys.Rev.D | Phys. Rev. D 99, 023006 (2019) | 10.1103/PhysRevD.99.023006 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The state of a static spherically symmetric relativistic axionically active
multi-component plasma in the gravitational, magnetic and electric fields of an
axionic dyon is studied in the framework of the Einstein - Maxwell - Boltzmann
- axion theory. We assume that the equations of axion electrodynamics, the
covarian... | [
{
"created": "Mon, 1 Oct 2018 21:00:20 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Jan 2019 10:37:23 GMT",
"version": "v2"
}
] | 2019-01-16 | [
[
"Balakin",
"Alexander B.",
""
],
[
"Groshev",
"Dmitry E.",
""
]
] | The state of a static spherically symmetric relativistic axionically active multi-component plasma in the gravitational, magnetic and electric fields of an axionic dyon is studied in the framework of the Einstein - Maxwell - Boltzmann - axion theory. We assume that the equations of axion electrodynamics, the covariant ... |
1708.00404 | Lionel London | Lionel London, Sebastian Khan, Edward Fauchon-Jones, Cecilio Garc\'ia,
Mark Hannam, Sascha Husa, Xisco Jim\'enez Forteza, Chinmay Kalaghatgi, Frank
Ohme, Francesco Pannarale | First higher-multipole model of gravitational waves from spinning and
coalescing black-hole binaries | 4 pages, 4 figures | Phys. Rev. Lett. 120, 161102 (2018) | 10.1103/PhysRevLett.120.161102 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational-wave observations of binary black holes currently rely on
theoretical models that predict the dominant multipoles (l,m) of the radiation
during inspiral, merger and ringdown. We introduce a simple method to include
the subdominant multipoles to binary black hole gravitational waveforms, given
a frequenc... | [
{
"created": "Tue, 1 Aug 2017 16:07:48 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 2017 09:14:46 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Dec 2017 14:15:55 GMT",
"version": "v3"
},
{
"created": "Thu, 18 Jan 2018 18:57:05 GMT",
"version": "v4"
}
] | 2018-04-25 | [
[
"London",
"Lionel",
""
],
[
"Khan",
"Sebastian",
""
],
[
"Fauchon-Jones",
"Edward",
""
],
[
"García",
"Cecilio",
""
],
[
"Hannam",
"Mark",
""
],
[
"Husa",
"Sascha",
""
],
[
"Forteza",
"Xisco Jiménez",
""
... | Gravitational-wave observations of binary black holes currently rely on theoretical models that predict the dominant multipoles (l,m) of the radiation during inspiral, merger and ringdown. We introduce a simple method to include the subdominant multipoles to binary black hole gravitational waveforms, given a frequency-... |
gr-qc/0209068 | Marcello Ortaggio | Marcello Ortaggio (Trento) and Jiri Podolsky (Prague) | Impulsive waves in electrovac direct product spacetimes with Lambda | 6 pages, 1 figure, LaTeX 2e. To appear in Class. Quantum Grav | Class.Quant.Grav. 19 (2002) 5221-5227 | 10.1088/0264-9381/19/20/313 | null | gr-qc hep-th | null | A complete family of non-expanding impulsive waves in spacetimes which are
the direct product of two 2-spaces of constant curvature is presented. In
addition to previously investigated impulses in Minkowski, (anti-)Nariai and
Bertotti-Robinson universes, a new explicit class of impulsive waves which
propagate in the ... | [
{
"created": "Fri, 20 Sep 2002 10:20:11 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ortaggio",
"Marcello",
"",
"Trento"
],
[
"Podolsky",
"Jiri",
"",
"Prague"
]
] | A complete family of non-expanding impulsive waves in spacetimes which are the direct product of two 2-spaces of constant curvature is presented. In addition to previously investigated impulses in Minkowski, (anti-)Nariai and Bertotti-Robinson universes, a new explicit class of impulsive waves which propagate in the ex... |
2002.08682 | Wen-Biao Han | Qian-Yun Yun, Wen-Biao Han, Gang Wang, Shu-Cheng Yang | Investigating eccentricities of the binary black hole signals from the
LIGO-Virgo catalog GWTC-1 | 9 pages, 6 figures, 3 tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the first Gravitational-Wave Transient Catalogue of LIGO and Virgo, all
events are announced having zero eccentricity. In the present paper, we
investigate the performance of SEOBNRE which is a spin-aligned eccentric
waveform model in time-domain. By comparing with all the eccentric waveforms in
SXS library, we fi... | [
{
"created": "Thu, 20 Feb 2020 11:28:27 GMT",
"version": "v1"
}
] | 2020-02-21 | [
[
"Yun",
"Qian-Yun",
""
],
[
"Han",
"Wen-Biao",
""
],
[
"Wang",
"Gang",
""
],
[
"Yang",
"Shu-Cheng",
""
]
] | In the first Gravitational-Wave Transient Catalogue of LIGO and Virgo, all events are announced having zero eccentricity. In the present paper, we investigate the performance of SEOBNRE which is a spin-aligned eccentric waveform model in time-domain. By comparing with all the eccentric waveforms in SXS library, we find... |
0704.2013 | Marcelo Alves | M. Alves | The conical singularity method and the energy-momentum tensor near the
black hole horizon using the Kruskal coordinates | null | Mod.Phys.Lett.A22:3057-3063,2007 | 10.1142/S0217732307023651 | null | gr-qc hep-th | null | We apply the conical singularity method to the two dimensional version of the
Schwarzschild metric to obtain the Kruskal coordinates of the black hole in a
very simple and direct way. Then we make use of this metric in an approximated
version and calculate the expected value of energy-momentum tensor of a
massless qu... | [
{
"created": "Mon, 16 Apr 2007 13:34:49 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Alves",
"M.",
""
]
] | We apply the conical singularity method to the two dimensional version of the Schwarzschild metric to obtain the Kruskal coordinates of the black hole in a very simple and direct way. Then we make use of this metric in an approximated version and calculate the expected value of energy-momentum tensor of a massless quan... |
gr-qc/0702048 | Mayeul Arminjon | Mayeul Arminjon | Dirac-type equations in a gravitational field, with vector wave function | 35 pages. Version accepted for publication in Foundations of Physics.
Title changed. Introduction expanded: detailed discussion of i) the vector
Dirac wave function and ii) the status of the equivalence principle, main
section (Sect. 2) improved by introducing the specific connection earlier
(see Theorem 1), an... | Found.Phys.38:1020-1045,2008 | 10.1007/s10701-008-9249-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analysis of the classical-quantum correspondence shows that it needs to
identify a preferred class of coordinate systems, which defines a torsionless
connection. One such class is that of the locally-geodesic systems,
corresponding to the Levi-Civita connection. Another class, thus another
connection, emerges if a... | [
{
"created": "Thu, 8 Feb 2007 14:22:16 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Mar 2007 17:13:45 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Jun 2007 14:40:55 GMT",
"version": "v3"
},
{
"created": "Tue, 14 Oct 2008 09:26:01 GMT",
"version": "v4"
}
] | 2008-12-18 | [
[
"Arminjon",
"Mayeul",
""
]
] | An analysis of the classical-quantum correspondence shows that it needs to identify a preferred class of coordinate systems, which defines a torsionless connection. One such class is that of the locally-geodesic systems, corresponding to the Levi-Civita connection. Another class, thus another connection, emerges if a p... |
1011.4933 | Sergey S. Kokarev | Sergey S. Kokarev | Complementarity of Kinematics and Geometry in General Relativity Theory | The paper is developed version of talk, presented at the conference
RusGrav-2010 (June 2010, Moscow), submitted to GRG | null | 10.1134/S0202289311040086 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relations between kinematics, geometry and law of reference frame motion are
considered. We show, that kinematical tensors define geometry up to a space
functional arbitrariness when integrability condition for spin tensor is
satisfied. Some aspects of geometrization principle and geometrical
conventionalism of Poinc... | [
{
"created": "Mon, 22 Nov 2010 20:52:21 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Kokarev",
"Sergey S.",
""
]
] | Relations between kinematics, geometry and law of reference frame motion are considered. We show, that kinematical tensors define geometry up to a space functional arbitrariness when integrability condition for spin tensor is satisfied. Some aspects of geometrization principle and geometrical conventionalism of Poincar... |
1811.07676 | Hamed Pejhan | Hamed Pejhan, Surena Rahbardehghan, Mohammad Enayati, Kazuharu Bamba,
and Anzhong Wang | `Hidden' symmetry of linearized gravity in de Sitter space | 6 pages, no figure, version accepted for publication in Physics
Letters B | Phys. Lett. B 795 (2019) 220-224 | 10.1016/j.physletb.2019.06.012 | FU-PCG-51 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that the linearized Einstein gravity in de Sitter (dS)
spacetime besides the evident symmetries also possesses the additional (local)
symmetry $h_{\mu\nu}\rightarrow h_{\mu\nu} + {\cal E}_{\mu\nu}\chi$, where
${\cal E}_{\mu\nu}$ is a spin-two projector tensor and $\chi$ is an arbitrary
constant functio... | [
{
"created": "Mon, 19 Nov 2018 13:35:39 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Apr 2019 00:58:10 GMT",
"version": "v2"
},
{
"created": "Sun, 9 Jun 2019 10:32:21 GMT",
"version": "v3"
},
{
"created": "Thu, 20 Jun 2019 06:18:58 GMT",
"version": "v4"
}
] | 2019-06-27 | [
[
"Pejhan",
"Hamed",
""
],
[
"Rahbardehghan",
"Surena",
""
],
[
"Enayati",
"Mohammad",
""
],
[
"Bamba",
"Kazuharu",
""
],
[
"Wang",
"Anzhong",
""
]
] | We demonstrate that the linearized Einstein gravity in de Sitter (dS) spacetime besides the evident symmetries also possesses the additional (local) symmetry $h_{\mu\nu}\rightarrow h_{\mu\nu} + {\cal E}_{\mu\nu}\chi$, where ${\cal E}_{\mu\nu}$ is a spin-two projector tensor and $\chi$ is an arbitrary constant function.... |
gr-qc/0103055 | Jeremy Nicholas Butterfield | J. N. Butterfield | The End of Time? | 48 pages Latex. A shortened version will appear in 'The British
Journal for Philosophy of Science' | null | null | null | gr-qc | null | I discuss J. Barbour's Machian theories of dynamics, and his proposal that a
Machian perspective enables one to solve the problem of time in quantum
geometrodynamics (by saying that there is no time). I concentrate on his recent
book 'The End of Time' (1999).
| [
{
"created": "Thu, 15 Mar 2001 17:12:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Butterfield",
"J. N.",
""
]
] | I discuss J. Barbour's Machian theories of dynamics, and his proposal that a Machian perspective enables one to solve the problem of time in quantum geometrodynamics (by saying that there is no time). I concentrate on his recent book 'The End of Time' (1999). |
1210.2973 | Christian Pfeifer | Christian Pfeifer, Mattias N. R. Wohlfarth | Finsler spacetimes and gravity | Conference proceedings "Relativity and Gravitation - 100 years after
Einstein in Prague", 5 pages | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the geometry of spacetime based on a non-metric, Finslerian,
length measure, which, in terms of physics, represents a generalized clock. Our
defnition of Finsler spacetimes ensure a well defined notion of causality, a
precise description of observers and a geometric background for field theories.
Moreover... | [
{
"created": "Wed, 10 Oct 2012 16:35:02 GMT",
"version": "v1"
}
] | 2012-10-11 | [
[
"Pfeifer",
"Christian",
""
],
[
"Wohlfarth",
"Mattias N. R.",
""
]
] | We consider the geometry of spacetime based on a non-metric, Finslerian, length measure, which, in terms of physics, represents a generalized clock. Our defnition of Finsler spacetimes ensure a well defined notion of causality, a precise description of observers and a geometric background for field theories. Moreover w... |
1510.02592 | Joanna Ja{\l}mu\.zna | Joanna Ja{\l}mu\.zna, Carsten Gundlach, Tadeusz Chmaj | Scalar field critical collapse in 2+1 dimensions | 27 pages | Phys. Rev. D 92, 124044 (2015) | 10.1103/PhysRevD.92.124044 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We carry out numerical experiments in the critical collapse of a spherically
symmetric massless scalar field in 2+1 spacetime dimensions in the presence of
a negative cosmological constant and compare them against a new theoretical
model. We approximate the true critical solution as the $n=4$ Garfinkle
solution, matc... | [
{
"created": "Fri, 9 Oct 2015 08:51:02 GMT",
"version": "v1"
}
] | 2015-12-30 | [
[
"Jałmużna",
"Joanna",
""
],
[
"Gundlach",
"Carsten",
""
],
[
"Chmaj",
"Tadeusz",
""
]
] | We carry out numerical experiments in the critical collapse of a spherically symmetric massless scalar field in 2+1 spacetime dimensions in the presence of a negative cosmological constant and compare them against a new theoretical model. We approximate the true critical solution as the $n=4$ Garfinkle solution, matche... |
1411.7887 | Paul Frampton | Paul H. Frampton | Bang or Bounce | 6 pages | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following up an earlier suggestion of how the Tolman Entropy Conundrum (TEC)
can be solved in a cyclic cosmology using the Come Back Empty (CBE) assumption
with phantom dark energy, here we show how the same CBE strategy may work with
a cosmological constant in the expansion era. As in the earlier case, this
leads to... | [
{
"created": "Wed, 26 Nov 2014 16:55:15 GMT",
"version": "v1"
}
] | 2014-12-01 | [
[
"Frampton",
"Paul H.",
""
]
] | Following up an earlier suggestion of how the Tolman Entropy Conundrum (TEC) can be solved in a cyclic cosmology using the Come Back Empty (CBE) assumption with phantom dark energy, here we show how the same CBE strategy may work with a cosmological constant in the expansion era. As in the earlier case, this leads to a... |
gr-qc/0212002 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | Improved limit on quantum-spacetime modifications of Lorentz symmetry
from observations of gamma-ray blazars | Published version [New J.Phys. 6 (2004) 188]. Title changed. Several
changes made during the long editing period. Revised commentary on
Crab-nebula synchrotron-radiation analysis reflects differences between
astro-ph/0212190v1 and astro-ph/0309681 (astro-ph/0212190v1 made a strong
claim which was softened in as... | New J.Phys.6:188,2004 | 10.1088/1367-2630/6/1/188 | null | gr-qc | null | In the quantum-gravity literature there has been interest in the possibility
that quantum properties of spacetime might affect the energy/momentum
dispersion relation. The most used test theory for data analysis is based on a
modification of the laws of propagation proposed in astro-ph/9712103 [Nature
393,763], and t... | [
{
"created": "Sat, 30 Nov 2002 00:07:16 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Jan 2003 21:21:29 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Dec 2004 15:49:54 GMT",
"version": "v3"
}
] | 2011-09-13 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | In the quantum-gravity literature there has been interest in the possibility that quantum properties of spacetime might affect the energy/momentum dispersion relation. The most used test theory for data analysis is based on a modification of the laws of propagation proposed in astro-ph/9712103 [Nature 393,763], and the... |
1702.00315 | Yafet Sanchez Sanchez | Yafet Sanchez Sanchez, Cesar Merlin and Ricardo Reynoso Fuentes | Lorentzian surfaces and the curvature of the Schmidt metric | null | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The b-boundary is a mathematical tool used to attach a topological boundary
to incomplete Lorentzian manifolds using a Riemaniann metric called the Schmidt
metric on the frame bundle. In this paper, we give the general form of the
Schmidt metric in the case of Lorentzian surfaces. Furthermore, we write the
Ricci scal... | [
{
"created": "Wed, 1 Feb 2017 15:32:19 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 2017 08:17:29 GMT",
"version": "v2"
},
{
"created": "Sun, 1 Apr 2018 21:25:34 GMT",
"version": "v3"
}
] | 2018-04-03 | [
[
"Sanchez",
"Yafet Sanchez",
""
],
[
"Merlin",
"Cesar",
""
],
[
"Fuentes",
"Ricardo Reynoso",
""
]
] | The b-boundary is a mathematical tool used to attach a topological boundary to incomplete Lorentzian manifolds using a Riemaniann metric called the Schmidt metric on the frame bundle. In this paper, we give the general form of the Schmidt metric in the case of Lorentzian surfaces. Furthermore, we write the Ricci scalar... |
1604.02762 | M. B. Paranjape | A. Landry and M. B. Paranjape | Graviton laser | 8 pages, no figures, submitted to the 2016 Gravity Research
Foundation Essay Competiton | null | 10.1142/S0218271816440168 | UdeM-GPP-TH-16-250 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the possibility of creating a graviton laser. The lasing medium
would be a system of contained, ultra cold neutrons. Ultra cold neutrons are a
quantum mechanical system that interacts with gravitational fields and with the
phonons of the container walls. It is possible to create a population inversion
by ... | [
{
"created": "Mon, 11 Apr 2016 00:24:53 GMT",
"version": "v1"
}
] | 2016-11-23 | [
[
"Landry",
"A.",
""
],
[
"Paranjape",
"M. B.",
""
]
] | We consider the possibility of creating a graviton laser. The lasing medium would be a system of contained, ultra cold neutrons. Ultra cold neutrons are a quantum mechanical system that interacts with gravitational fields and with the phonons of the container walls. It is possible to create a population inversion by pu... |
gr-qc/0012052 | Kayll Lake | Nicos Pelavas, Nicholas Neary and Kayll Lake | Properties of the instantaneous Ergo Surface of a Kerr Black Hole | 15 pages, 11 figures, also on the web at
http://grtensor.phy.queensu.ca/ergo/ | Class.Quant.Grav. 18 (2001) 1319-1332 | 10.1088/0264-9381/18/7/314 | null | gr-qc astro-ph | null | This paper explores properties of the instantaneous ergo surface of a Kerr
black hole. The surface area is evaluated in closed form. In terms of the mass
($m$) and angular velocity ($a$), to second order in $a$, the area of the ergo
surface is given by $16 \pi m^2 + 4 \pi a^2$ (compared to the familiar $16 \pi
m^2 - ... | [
{
"created": "Fri, 15 Dec 2000 02:48:19 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2001 18:31:31 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Pelavas",
"Nicos",
""
],
[
"Neary",
"Nicholas",
""
],
[
"Lake",
"Kayll",
""
]
] | This paper explores properties of the instantaneous ergo surface of a Kerr black hole. The surface area is evaluated in closed form. In terms of the mass ($m$) and angular velocity ($a$), to second order in $a$, the area of the ergo surface is given by $16 \pi m^2 + 4 \pi a^2$ (compared to the familiar $16 \pi m^2 - 4 ... |
2304.12644 | Wenfu Cao | Wen-Fu Cao, Wen-Fang Liu, Xin Wu | Parameter constraints from shadows of Kerr-Newman-dS black holes with
cloud strings and quintessence | 30 pages, 10 figures | General Relativity and Gravitation (2023) 55:120 | 10.1007/s10714-023-03169-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The motion of photons around the Kerr-Newman-dS black hole surrounded by
quintessence and a cloud of strings is investigated. The existence of the
Carter constant leads to that of unstable circular photon orbits on a
two-dimensional plane not limited to the equatorial plane and unstable
spherical photon orbits in the... | [
{
"created": "Tue, 25 Apr 2023 08:22:11 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2023 11:06:03 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Oct 2023 00:44:57 GMT",
"version": "v3"
}
] | 2023-10-31 | [
[
"Cao",
"Wen-Fu",
""
],
[
"Liu",
"Wen-Fang",
""
],
[
"Wu",
"Xin",
""
]
] | The motion of photons around the Kerr-Newman-dS black hole surrounded by quintessence and a cloud of strings is investigated. The existence of the Carter constant leads to that of unstable circular photon orbits on a two-dimensional plane not limited to the equatorial plane and unstable spherical photon orbits in the t... |
gr-qc/0504095 | Sergiu Vacaru I. | Sergiu I. Vacaru | Nonholonomic Deformations of Disk Solutions and Algebroid Symmetries in
Einstein and Extra Dimension Gravity | latex2e, 66 pages (Appendix on 26 pages) | null | null | null | gr-qc astro-ph hep-th math-ph math.DG math.MP | null | In this article we consider nonholonomic deformations of disk solutions in
general relativity to generic off-diagonal metrics defining knew classes of
exact solutions in 4D and 5D gravity. These solutions possess Lie algebroid
symmetries and local anisotropy and define certain generalizations of manifolds
with Killin... | [
{
"created": "Wed, 20 Apr 2005 21:20:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vacaru",
"Sergiu I.",
""
]
] | In this article we consider nonholonomic deformations of disk solutions in general relativity to generic off-diagonal metrics defining knew classes of exact solutions in 4D and 5D gravity. These solutions possess Lie algebroid symmetries and local anisotropy and define certain generalizations of manifolds with Killing ... |
0806.1037 | Ian Hinder | Ian Hinder, Frank Herrmann, Pablo Laguna and Deirdre Shoemaker | Comparisons of eccentric binary black hole simulations with
post-Newtonian models | 15 pages, 7 figures. Replaced extrapolation of fit parameters with
values at earliest time - results unchanged. Corrected equation typos in
Section IIa. Other minor changes. Corresponds to PRD version | Phys.Rev.D82:024033,2010 | 10.1103/PhysRevD.82.024033 | IGC-08/6-1 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first comparison between numerical relativity (NR) simulations
of an eccentric binary black hole system with corresponding post-Newtonian (PN)
results. We evolve an equal-mass, non-spinning configuration with an initial
eccentricity e ~ 0.1 for 21 gravitational wave cycles before merger, and find
agree... | [
{
"created": "Thu, 5 Jun 2008 19:52:43 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Aug 2010 13:41:40 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Hinder",
"Ian",
""
],
[
"Herrmann",
"Frank",
""
],
[
"Laguna",
"Pablo",
""
],
[
"Shoemaker",
"Deirdre",
""
]
] | We present the first comparison between numerical relativity (NR) simulations of an eccentric binary black hole system with corresponding post-Newtonian (PN) results. We evolve an equal-mass, non-spinning configuration with an initial eccentricity e ~ 0.1 for 21 gravitational wave cycles before merger, and find agreeme... |
2310.04150 | Hyerim Noh | Jai-chan Hwang and Hyerim Noh | On graviton-photon conversions in magnetic environments | 8 pages, no figure, to appear in Phys. Dark. Univ | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Graviton-photon conversions in a given external electric or magnetic field,
known as the Gertsenshtein mechanism, are usually treated using the
four-potential for photons. In terms of the electric and magnetic (EM) fields,
however, proper identification of the fields in curved spacetime is important.
By misidentifyin... | [
{
"created": "Fri, 6 Oct 2023 10:49:23 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jan 2024 00:41:20 GMT",
"version": "v2"
}
] | 2024-01-23 | [
[
"Hwang",
"Jai-chan",
""
],
[
"Noh",
"Hyerim",
""
]
] | Graviton-photon conversions in a given external electric or magnetic field, known as the Gertsenshtein mechanism, are usually treated using the four-potential for photons. In terms of the electric and magnetic (EM) fields, however, proper identification of the fields in curved spacetime is important. By misidentifying ... |
2301.07289 | Mohd Salman | Musavvir Ali, Mohammad Salman, and Sezgin Altay Demirbag | Impact of symmetry inheritance on conformally flat spacetime | null | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The goal of this research paper is to investigate curvature inheritance
symmetry in conformally flat spacetime. Curvature inheritance symmetry in
conformally flat spacetime is shown to be a conformal motion. We have proven
that a conformally flat spacetime reduces to Einstein spacetime if admits
curvature inheritance... | [
{
"created": "Wed, 18 Jan 2023 03:39:34 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jul 2024 18:17:04 GMT",
"version": "v2"
}
] | 2024-07-08 | [
[
"Ali",
"Musavvir",
""
],
[
"Salman",
"Mohammad",
""
],
[
"Demirbag",
"Sezgin Altay",
""
]
] | The goal of this research paper is to investigate curvature inheritance symmetry in conformally flat spacetime. Curvature inheritance symmetry in conformally flat spacetime is shown to be a conformal motion. We have proven that a conformally flat spacetime reduces to Einstein spacetime if admits curvature inheritance s... |
2305.18031 | Panagiotis Dorlis | Panagiotis Dorlis, Nick E. Mavromatos and Sotirios-Neilos Vlachos | Bypassing Bekenstein's no-scalar-hair theorem without violating the
energy conditions | 16 pages, 8 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this work we establish in a rigorous manner, and a model independent way,
the conditions for bypassing Bekenstein's no-scalar-hair theorem for static,
spherically symmetric, and asymptotically flat black holes, while maintaining
the validity of the energy conditions. Specifically, we argue that a hidden
assumption... | [
{
"created": "Mon, 29 May 2023 11:52:09 GMT",
"version": "v1"
}
] | 2023-05-30 | [
[
"Dorlis",
"Panagiotis",
""
],
[
"Mavromatos",
"Nick E.",
""
],
[
"Vlachos",
"Sotirios-Neilos",
""
]
] | In this work we establish in a rigorous manner, and a model independent way, the conditions for bypassing Bekenstein's no-scalar-hair theorem for static, spherically symmetric, and asymptotically flat black holes, while maintaining the validity of the energy conditions. Specifically, we argue that a hidden assumption i... |
0805.4660 | Takeshi Chiba | Takeshi Chiba | Initial Conditions for Vector Inflation | 12 pages, 5 figures, version to be published in JCAP | JCAP 0808:004,2008 | 10.1088/1475-7516/2008/08/004 | null | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a model of inflation using non-minimally coupled massive vector
fields has been proposed. For a particular choice of non-minimal coupling
parameter and for a flat FRW model, the model is reduced to the model of
chaotic inflation with massive scalar field. We study the effect of non-zero
curvature of the uni... | [
{
"created": "Fri, 30 May 2008 02:34:06 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jul 2008 02:10:20 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Aug 2008 03:00:27 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"Chiba",
"Takeshi",
""
]
] | Recently, a model of inflation using non-minimally coupled massive vector fields has been proposed. For a particular choice of non-minimal coupling parameter and for a flat FRW model, the model is reduced to the model of chaotic inflation with massive scalar field. We study the effect of non-zero curvature of the unive... |
2306.13286 | Deyou Chen | Deyou Chen, Yucheng He, Jun Tao | Topological classes of higher-dimensional black holes in massive gravity | 21 pages, 13 figures | Eur. Phys. J. C (2023) 83:872 | 10.1140/epjc/s10052-023-11983-0 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we study topological numbers for five-, six- and
seven-dimensional anti-de Sitter black holes in the ghost-free massive gravity.
We find that when the black holes are charged, they have the same topological
number. The topological numbers for the uncharged black holes are 0 or 1, and
the specific value... | [
{
"created": "Fri, 23 Jun 2023 04:21:11 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jun 2023 11:40:39 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Jul 2023 04:59:03 GMT",
"version": "v3"
},
{
"created": "Wed, 10 Jul 2024 08:15:09 GMT",
"version": "v4"
}
] | 2024-07-11 | [
[
"Chen",
"Deyou",
""
],
[
"He",
"Yucheng",
""
],
[
"Tao",
"Jun",
""
]
] | In this paper, we study topological numbers for five-, six- and seven-dimensional anti-de Sitter black holes in the ghost-free massive gravity. We find that when the black holes are charged, they have the same topological number. The topological numbers for the uncharged black holes are 0 or 1, and the specific values ... |
gr-qc/0311029 | Choquet-Bruhat | Yvonne Choquet-Bruhat | Einstein constraints on n dimensional compact manifolds | Article for the volume "Space time safari" in honor of Vincent
Moncrief | Class.Quant.Grav.21:S127-S152,2004 | null | null | gr-qc | null | We give a general survey of the solution of the Einstein constraints by the
conformal method on n dimensional compact manifolds. We prove some new results
about solutions with low regularity (solutions in $H_{2}$ when n=3), and
solutions with unscaled sources.
| [
{
"created": "Sat, 8 Nov 2003 15:22:24 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Choquet-Bruhat",
"Yvonne",
""
]
] | We give a general survey of the solution of the Einstein constraints by the conformal method on n dimensional compact manifolds. We prove some new results about solutions with low regularity (solutions in $H_{2}$ when n=3), and solutions with unscaled sources. |
2403.15847 | Tayyaba Naz | Adnan Malik, Tayyaba Naz, Aimen Rauf, M. Farasat Shamir, Z. Yousaf | $f(R, T)$ Gravity Bouncing Universe with Cosmological Parameters | 18 pages, 10 figures | Eur. Phys. J. Plus 139 (2024) 276 | 10.1140/epjp/s13360-024-05006-4 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The basic aim of this manuscript is to investigate the cosmological solutions
in the context of the modified $f(R, T)$ theory of gravity, where $R$ is the
Ricci scalar and $T$ is the trace of the energy-momentum tensor. For our
current work, we consider the Friedmann-Robertson-Walker space-time for finding
the soluti... | [
{
"created": "Sat, 23 Mar 2024 13:51:25 GMT",
"version": "v1"
}
] | 2024-03-26 | [
[
"Malik",
"Adnan",
""
],
[
"Naz",
"Tayyaba",
""
],
[
"Rauf",
"Aimen",
""
],
[
"Shamir",
"M. Farasat",
""
],
[
"Yousaf",
"Z.",
""
]
] | The basic aim of this manuscript is to investigate the cosmological solutions in the context of the modified $f(R, T)$ theory of gravity, where $R$ is the Ricci scalar and $T$ is the trace of the energy-momentum tensor. For our current work, we consider the Friedmann-Robertson-Walker space-time for finding the solution... |
1906.05185 | Leonardo Modesto | Qiang Li, Leonardo Modesto | Galactic rotation curves in Einstein's conformal gravity | 17 pages, 8 figures | null | null | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show quantitatively that an exact solution of Einstein's conformal gravity
can explain very well the galactic rotation curves for a sample of 104 galaxies
without need for dark matter or other exotic modification of gravity. The
metric is an overall rescaling of the Schwarzschild-de Sitter spacetime as
required by... | [
{
"created": "Wed, 12 Jun 2019 14:55:05 GMT",
"version": "v1"
}
] | 2019-06-13 | [
[
"Li",
"Qiang",
""
],
[
"Modesto",
"Leonardo",
""
]
] | We show quantitatively that an exact solution of Einstein's conformal gravity can explain very well the galactic rotation curves for a sample of 104 galaxies without need for dark matter or other exotic modification of gravity. The metric is an overall rescaling of the Schwarzschild-de Sitter spacetime as required by W... |
1708.09760 | Vedran Skrinjar | Carlos M. Nieto, Roberto Percacci, Vedran Skrinjar | Split Weyl transformations in quantum gravity | null | Phys. Rev. D 96, 106019 (2017) | 10.1103/PhysRevD.96.106019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss various realizations of the Weyl group in the background field
expansion of quantum gravity, in the presence of a cutoff, as required in
applications of the functional renormalization group. In order to study the
background--dependence, special attention is given to split gauge
transformations, which act o... | [
{
"created": "Thu, 31 Aug 2017 14:54:04 GMT",
"version": "v1"
}
] | 2017-12-06 | [
[
"Nieto",
"Carlos M.",
""
],
[
"Percacci",
"Roberto",
""
],
[
"Skrinjar",
"Vedran",
""
]
] | We discuss various realizations of the Weyl group in the background field expansion of quantum gravity, in the presence of a cutoff, as required in applications of the functional renormalization group. In order to study the background--dependence, special attention is given to split gauge transformations, which act on ... |
1201.0806 | Vladimir Khatsymovsky | V. M. Khatsymovsky | First order representation of the Faddeev formulation of gravity | 9 pages | Class.Quant.Grav.30:095006,2013 | 10.1088/0264-9381/30/9/095006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Faddeev formulation of gravity, in which the metric is composed of
vector fields or the tetrad of the ten-dimensional fields, $f^A_\lambda$, where
$\lambda = 1, 2, 3, 4$ and $A = 1, ..., 10$ is vector index w. r. t. the
Euclidean (or Minkowsky) ten-dimensional spacetime. We propose representation
of the type... | [
{
"created": "Wed, 4 Jan 2012 02:20:08 GMT",
"version": "v1"
}
] | 2015-12-10 | [
[
"Khatsymovsky",
"V. M.",
""
]
] | We study Faddeev formulation of gravity, in which the metric is composed of vector fields or the tetrad of the ten-dimensional fields, $f^A_\lambda$, where $\lambda = 1, 2, 3, 4$ and $A = 1, ..., 10$ is vector index w. r. t. the Euclidean (or Minkowsky) ten-dimensional spacetime. We propose representation of the type o... |
2111.08713 | Grant Remmen | Grant N. Remmen | Exploration of a Singular Fluid Spacetime | 25 pages, 6 figures | Gen.Rel.Grav.53:101,2021 | 10.1007/s10714-021-02873-5 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the properties of a special class of singular solutions for a
self-gravitating perfect fluid in general relativity: the singular isothermal
sphere. For arbitrary constant equation-of-state parameter $w=p/\rho$, there
exist static, spherically-symmetric solutions with density profile $\propto
1/r^2$, wi... | [
{
"created": "Tue, 16 Nov 2021 19:00:00 GMT",
"version": "v1"
}
] | 2021-11-18 | [
[
"Remmen",
"Grant N.",
""
]
] | We investigate the properties of a special class of singular solutions for a self-gravitating perfect fluid in general relativity: the singular isothermal sphere. For arbitrary constant equation-of-state parameter $w=p/\rho$, there exist static, spherically-symmetric solutions with density profile $\propto 1/r^2$, with... |
gr-qc/0508050 | Eran Rosenthal | Eran Rosenthal | Regularization of the second-order gravitational perturbations produced
by a compact object | 12 pages, discussion expanded, to be published in Phys. Rev. D Rapid
Communication | Phys.Rev. D72 (2005) 121503 | 10.1103/PhysRevD.72.121503 | null | gr-qc | null | The equations for the second-order gravitational perturbations produced by a
compact-object have highly singular source terms at the point particle limit.
At this limit the standard retarded solutions to these equations are
ill-defined. Here we construct well-defined and physically meaningful solutions
to these equat... | [
{
"created": "Thu, 11 Aug 2005 20:16:41 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Oct 2005 20:56:54 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Dec 2005 16:43:48 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Rosenthal",
"Eran",
""
]
] | The equations for the second-order gravitational perturbations produced by a compact-object have highly singular source terms at the point particle limit. At this limit the standard retarded solutions to these equations are ill-defined. Here we construct well-defined and physically meaningful solutions to these equatio... |
2311.13839 | Farruh Atamurotov | G. Mustafa, S. K. Maurya, A. Ditta, Saibal Ray, Farruh Atamurotov | Circular orbits and accretion disk around AdS black holes surrounded by
dark fluid with Chaplygin-like equation of state | 22 pages, 12 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work we study the geodesic motion and accretion process of a
test particle near an Anti-de Sitter (ADS) BH surrounded by a dark fluid with a
Chaplygin-like equation. Within the defined paradigm, we investigate on the
equatorial plane and examine circular geodesics along with their features
related to s... | [
{
"created": "Thu, 23 Nov 2023 07:53:35 GMT",
"version": "v1"
}
] | 2023-11-27 | [
[
"Mustafa",
"G.",
""
],
[
"Maurya",
"S. K.",
""
],
[
"Ditta",
"A.",
""
],
[
"Ray",
"Saibal",
""
],
[
"Atamurotov",
"Farruh",
""
]
] | In the present work we study the geodesic motion and accretion process of a test particle near an Anti-de Sitter (ADS) BH surrounded by a dark fluid with a Chaplygin-like equation. Within the defined paradigm, we investigate on the equatorial plane and examine circular geodesics along with their features related to sta... |
gr-qc/9905033 | Daisuke Ida | Daisuke Ida and Sean A. Hayward | How much negative energy does a wormhole need? | 6 pages, no figures | Phys.Lett. A260 (1999) 175-181 | 10.1016/S0375-9601(99)00518-6 | null | gr-qc | null | It is known that traversible wormholes require negative energy density. We
here argue how much negative energy is needed for wormholes, using a local
analysis which does not assume any symmetry. and in particular allows dynamic
(non-stationary) but non-degenerate wormholes. We find that wormholes require
two constrai... | [
{
"created": "Tue, 11 May 1999 08:45:34 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Nov 1999 16:03:27 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Ida",
"Daisuke",
""
],
[
"Hayward",
"Sean A.",
""
]
] | It is known that traversible wormholes require negative energy density. We here argue how much negative energy is needed for wormholes, using a local analysis which does not assume any symmetry. and in particular allows dynamic (non-stationary) but non-degenerate wormholes. We find that wormholes require two constraint... |
1905.05561 | Zaim Slimane | Slimane Zaim and Hadjar Rezki | Thermodynamic Properties of Yukawa-Schwarzschild Black Hole in
Non-commutative Gauge Gravity | 12 pages, 4 figures | Gravitation and Cosmology 26 (3), 200-207 (2020) | 10.1134/S0202289320030135 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we construct a non-commutative gauge theory for the deformed
metric corresponding to the modified structure of a gravitational field in the
case of Yukawa-Schwarzschild non-commutative space-time. The thermodynamic
properties and corrections to the gravitational force on the horizon of a
non-commutative... | [
{
"created": "Tue, 14 May 2019 12:44:20 GMT",
"version": "v1"
}
] | 2022-06-15 | [
[
"Zaim",
"Slimane",
""
],
[
"Rezki",
"Hadjar",
""
]
] | In this paper we construct a non-commutative gauge theory for the deformed metric corresponding to the modified structure of a gravitational field in the case of Yukawa-Schwarzschild non-commutative space-time. The thermodynamic properties and corrections to the gravitational force on the horizon of a non-commutative Y... |
2407.04762 | Alessandro Nagar | Alessandro Nagar, Sebastiano Bernuzzi, Danilo Chiaramello, Veronica
Fantini, Rossella Gamba, Mattia Panzeri, and Piero Rettegno | Effective-one-body waveform model for noncircularized, planar,
coalescing black hole binaries II: high accuracy by improving logarithmic
terms in resummations | 14 pages, 9 figures. Submitted to Phys. Rev. D | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Effective-one-body (EOB) models are based on analytical building blocks that,
mathematically, are truncated Taylor series with logarithms. These polynomials
are usually resummed using Pad\'e approximants obtained first assuming that the
logarithms are constant, and then replacing them back into the resulting
rational... | [
{
"created": "Fri, 5 Jul 2024 18:00:00 GMT",
"version": "v1"
}
] | 2024-07-09 | [
[
"Nagar",
"Alessandro",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Chiaramello",
"Danilo",
""
],
[
"Fantini",
"Veronica",
""
],
[
"Gamba",
"Rossella",
""
],
[
"Panzeri",
"Mattia",
""
],
[
"Rettegno",
"Piero",
... | Effective-one-body (EOB) models are based on analytical building blocks that, mathematically, are truncated Taylor series with logarithms. These polynomials are usually resummed using Pad\'e approximants obtained first assuming that the logarithms are constant, and then replacing them back into the resulting rational f... |
1410.0509 | Jose Luis Jaramillo | Jos\'e Luis Jaramillo | Black hole horizons and quantum charged particles | 5 pages, no figures | null | 10.1088/0264-9381/32/13/132001 | null | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out a structural similarity between the characterization of black
hole apparent horizons as stable marginally outer trapped surfaces (MOTS) and
the quantum description of a non-relativistic charged particle moving in given
magnetic and electric fields on a closed surface. Specifically, the spectral
problem o... | [
{
"created": "Thu, 2 Oct 2014 10:56:55 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Jaramillo",
"José Luis",
""
]
] | We point out a structural similarity between the characterization of black hole apparent horizons as stable marginally outer trapped surfaces (MOTS) and the quantum description of a non-relativistic charged particle moving in given magnetic and electric fields on a closed surface. Specifically, the spectral problem of ... |
2310.07368 | Elisa Maggio | Elisa Maggio | Probing the horizon of black holes with gravitational waves | 14 pages, 5 figures, contribution to the book "Modified and Quantum
Gravity - From theory to experimental searches on all scales" | Lecture Notes in Physics, vol 1017, Springer (2023) | 10.1007/978-3-031-31520-6_9 | null | gr-qc astro-ph.HE hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves open the possibility to investigate the nature of compact
objects and probe the horizons of black holes. Some models of modified gravity
predict the presence of horizonless and singularity-free compact objects. Such
dark compact objects would emit a gravitational-wave signal which differs from
the... | [
{
"created": "Wed, 11 Oct 2023 10:36:38 GMT",
"version": "v1"
}
] | 2023-10-12 | [
[
"Maggio",
"Elisa",
""
]
] | Gravitational waves open the possibility to investigate the nature of compact objects and probe the horizons of black holes. Some models of modified gravity predict the presence of horizonless and singularity-free compact objects. Such dark compact objects would emit a gravitational-wave signal which differs from the s... |
1311.1455 | Sharmanthie Fernando | Sharmanthie Fernando | String black hole: Can it be a particle accelerator ? | 17 pages and 10 figures, journal reference added | Genera Relativity and Gravitation Vol 46, (2014) 1634 | 10.1007/s10714-013-1634-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we have studied the possibility of the center-of-mass energy of
two particles colliding near the horizon of a static charged black hole in
string theory. Various cases corresponding to the electric charge and the
angular momentum of the particles were considered. The studies were done for
the general bl... | [
{
"created": "Wed, 6 Nov 2013 17:38:54 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Aug 2014 12:40:12 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Fernando",
"Sharmanthie",
""
]
] | In this paper we have studied the possibility of the center-of-mass energy of two particles colliding near the horizon of a static charged black hole in string theory. Various cases corresponding to the electric charge and the angular momentum of the particles were considered. The studies were done for the general blac... |
1606.03413 | Bob Osano | Bob Osano and Patrick W M Adams | Toward the analogue of thermally generated electromagnetic fields | 7 pages, 6 figures | Journal of Mathematical Physics 58, 093101 (2017) | 10.1063/1.5001338 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Magnetic and vorticity fields evolution equations are known to obey the same
equation when effects of dissipation and sources terms are negligible. We
investigate the analogy between the two fields for non-vanishing dissipation
and sources. In addition to the Reynolds (Re)and Prandtl (Pr_M) numbers, we
define a new n... | [
{
"created": "Fri, 10 Jun 2016 18:15:42 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Oct 2017 16:19:08 GMT",
"version": "v2"
}
] | 2017-10-31 | [
[
"Osano",
"Bob",
""
],
[
"Adams",
"Patrick W M",
""
]
] | Magnetic and vorticity fields evolution equations are known to obey the same equation when effects of dissipation and sources terms are negligible. We investigate the analogy between the two fields for non-vanishing dissipation and sources. In addition to the Reynolds (Re)and Prandtl (Pr_M) numbers, we define a new num... |
1411.1836 | Ravindra Saraykar Dr. | R V Saraykar and Sujatha Janardhan | Causal and Topological Aspects in Special and General Theory of
Relativity | 33 pages, expanded version of the article arXiv:1208.4580, published
in 'Gravitation and Cosmology' | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we present a review of a geometric and algebraic approach to
causal cones and describe cone preserving transformations and their
relationship with the causal structure related to special and general
relativity. We describe Lie groups, especially matrix Lie groups, homogeneous
and symmetric spaces and ... | [
{
"created": "Fri, 7 Nov 2014 05:57:59 GMT",
"version": "v1"
}
] | 2014-11-10 | [
[
"Saraykar",
"R V",
""
],
[
"Janardhan",
"Sujatha",
""
]
] | In this article we present a review of a geometric and algebraic approach to causal cones and describe cone preserving transformations and their relationship with the causal structure related to special and general relativity. We describe Lie groups, especially matrix Lie groups, homogeneous and symmetric spaces and ca... |
1707.09664 | Antonin Coutant | Antonin Coutant, Silke Weinfurtner | Low frequency analogue Hawking radiation: The Bogoliubov-de Gennes model | 27 pages, 4 figures. v2: typo corrected, few clarifications,
references added | Phys. Rev. D 97, 025006 (2018) | 10.1103/PhysRevD.97.025006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically study the low-frequency properties of the analogue Hawking
effect in Bose-Einstein condensates. We show that in one-dimensional flows
displaying an analogue horizon, the Hawking effect is dominant in the
low-frequency regime. This happens despite non vanishing greybody factors, that
is, the coupling o... | [
{
"created": "Sun, 30 Jul 2017 20:16:29 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jan 2018 17:23:48 GMT",
"version": "v2"
}
] | 2018-01-15 | [
[
"Coutant",
"Antonin",
""
],
[
"Weinfurtner",
"Silke",
""
]
] | We analytically study the low-frequency properties of the analogue Hawking effect in Bose-Einstein condensates. We show that in one-dimensional flows displaying an analogue horizon, the Hawking effect is dominant in the low-frequency regime. This happens despite non vanishing greybody factors, that is, the coupling of ... |
2407.19508 | Joshi Ashok B | Ashok B. Joshi, Dipanjan Dey, Pankaj S. Joshi and Vivekkumar R. Tank | Tidal forces in collapsing compact objects | 13 pages, 5 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we investigate tidal forces in the Lemaitre-Tolman-Bondi (LTB)
metric, focusing on both hidden and locally visible singularities. We discuss
the strength of these singularities in terms of deformationally strong
singularities. Specifically, we analyze tidal forces in LTB spacetime,
calculating radial an... | [
{
"created": "Sun, 28 Jul 2024 15:05:17 GMT",
"version": "v1"
}
] | 2024-07-30 | [
[
"Joshi",
"Ashok B.",
""
],
[
"Dey",
"Dipanjan",
""
],
[
"Joshi",
"Pankaj S.",
""
],
[
"Tank",
"Vivekkumar R.",
""
]
] | In this work, we investigate tidal forces in the Lemaitre-Tolman-Bondi (LTB) metric, focusing on both hidden and locally visible singularities. We discuss the strength of these singularities in terms of deformationally strong singularities. Specifically, we analyze tidal forces in LTB spacetime, calculating radial and ... |
gr-qc/0610008 | Diego Pavon | Diego Pavon | Holographic dark energy and late cosmic acceleration | 6 pages, no figures, contribution to the Proceedings of IRGAC-06 | J.Phys.A40:6865-6870,2007 | 10.1088/1751-8113/40/25/S31 | null | gr-qc | null | It has been persuasively argued that the number of the effective degrees of
freedom of a macroscopic system is proportional to its area rather than to its
volume. This entails interesting consequences for cosmology. Here we present a
model based on this "holographic principle" that accounts for the present stage
of a... | [
{
"created": "Mon, 2 Oct 2006 16:08:23 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pavon",
"Diego",
""
]
] | It has been persuasively argued that the number of the effective degrees of freedom of a macroscopic system is proportional to its area rather than to its volume. This entails interesting consequences for cosmology. Here we present a model based on this "holographic principle" that accounts for the present stage of acc... |
2012.01320 | Lijing Shao | Rui Xu, Yong Gao, Lijing Shao | Precession of spheroids under Lorentz violation and observational
consequences for neutron stars | 16 pages, 12 figures; accepted by PRD | Phys. Rev. D 103, 084028 (2021) | 10.1103/PhysRevD.103.084028 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard-Model Extension (SME) is an effective-field-theoretic framework
that catalogs all Lorentz-violating field operators. The anisotropic correction
from the minimal gravitational SME to Newtonian gravitational energy for
spheroids is studied, and the rotation of rigid spheroids is solved with
perturbation me... | [
{
"created": "Wed, 2 Dec 2020 16:49:26 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Dec 2020 08:41:52 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Mar 2021 00:59:23 GMT",
"version": "v3"
}
] | 2021-04-20 | [
[
"Xu",
"Rui",
""
],
[
"Gao",
"Yong",
""
],
[
"Shao",
"Lijing",
""
]
] | The Standard-Model Extension (SME) is an effective-field-theoretic framework that catalogs all Lorentz-violating field operators. The anisotropic correction from the minimal gravitational SME to Newtonian gravitational energy for spheroids is studied, and the rotation of rigid spheroids is solved with perturbation meth... |
2407.08217 | Dipankar Laya | Dipankar Laya, Roshni Bhaumik, Sourav Dutta, Subenoy Chakraborty | A description of classical and quantum cosmology for a single scalar
field torsion gravity | 16 Pages, 4 figures | Modern Physics Letters A Vol. 38, Nos. 22 & 23 (2023) 2350109 (15
pages) | 10.1142/S0217732323501092 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In the background of homogeneous and isotropic flat FLRW space-time, both
classical and quantum cosmology has been studied for teleparallel dark energy
(DE) model. Using Noether symmetry analysis, not only the symmetry vector but
also the coupling function in the Lagrangian and the potential of the scalar
field has b... | [
{
"created": "Thu, 11 Jul 2024 06:34:02 GMT",
"version": "v1"
}
] | 2024-07-12 | [
[
"Laya",
"Dipankar",
""
],
[
"Bhaumik",
"Roshni",
""
],
[
"Dutta",
"Sourav",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In the background of homogeneous and isotropic flat FLRW space-time, both classical and quantum cosmology has been studied for teleparallel dark energy (DE) model. Using Noether symmetry analysis, not only the symmetry vector but also the coupling function in the Lagrangian and the potential of the scalar field has bee... |
2008.12526 | Gihyuk Cho | Gihyuk Cho | Analytic expression of perturbations of Schwarzschild spacetime via
Homotopy Analysis Method | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper derives the analytic and practicable expression of general
solution of vacuum Regge-Wheeler equation via Homotopy Analysis Method.
| [
{
"created": "Fri, 28 Aug 2020 07:41:33 GMT",
"version": "v1"
}
] | 2020-08-31 | [
[
"Cho",
"Gihyuk",
""
]
] | This paper derives the analytic and practicable expression of general solution of vacuum Regge-Wheeler equation via Homotopy Analysis Method. |
1112.2478 | Matthew Lake Dr | Matthew Lake and Teruaki Suyama | Evolution of FLRW spacetime after the birth of a cosmic string | 16 pages, 2 figures, published version | Phys. Rev. D 85, 083521 (2012) | 10.1103/PhysRevD.85.083521 | RESCEU-34/11 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the evolution of an initially FLRW universe after the formation
of a long, straight, cosmic string with arbitrary tension and mass per unit
length. The birth of the string sources scalar and tensor-type perturbations in
the background metric and both density and velocity perturbations in the
background fl... | [
{
"created": "Mon, 12 Dec 2011 09:31:06 GMT",
"version": "v1"
},
{
"created": "Tue, 1 May 2012 06:01:16 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Lake",
"Matthew",
""
],
[
"Suyama",
"Teruaki",
""
]
] | We consider the evolution of an initially FLRW universe after the formation of a long, straight, cosmic string with arbitrary tension and mass per unit length. The birth of the string sources scalar and tensor-type perturbations in the background metric and both density and velocity perturbations in the background flui... |
2008.01588 | S Habib Mazharimousavi | S. Habib Mazharimousavi and M. Halilsoy | Colliding waves in a model of nonlinear electrodynamics | No figure, 7 pages. Final version, published in Classical and Quantum
Gravity | Class. Quantum Grav. 37 (2020) 137001 (8pp) | 10.1088/1361-6382/ab9516 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bell-Szekeres (BS) solution for colliding electromagnetic waves in
Einstein-Maxwell (EM) theory describes also colliding waves in nonlinear
electrodynamics (NED) with an emergent cosmological constant. Our NED model
covers the first leading orders to the well-known Heisenberg-Euler (HE) type in
a particular gauge of ... | [
{
"created": "Mon, 3 Aug 2020 15:50:54 GMT",
"version": "v1"
}
] | 2020-08-05 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
]
] | Bell-Szekeres (BS) solution for colliding electromagnetic waves in Einstein-Maxwell (EM) theory describes also colliding waves in nonlinear electrodynamics (NED) with an emergent cosmological constant. Our NED model covers the first leading orders to the well-known Heisenberg-Euler (HE) type in a particular gauge of pu... |
1005.5460 | Seth A. Major | Seth A. Major | Shape in an Atom of Space: Exploring quantum geometry phenomenology | 14 pages, 7 figures; v2 references added | Class.Quant.Grav.27:225012,2010 | 10.1088/0264-9381/27/22/225012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A phenomenology for the deep spatial geometry of loop quantum gravity is
introduced. In the context of a simple model, an atom of space, it is shown how
purely combinatorial structures can affect observations. The angle operator is
used to develop a model of angular corrections to local, continuum flat-space
3-geomet... | [
{
"created": "Sat, 29 May 2010 15:16:41 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jun 2010 20:27:41 GMT",
"version": "v2"
}
] | 2014-11-21 | [
[
"Major",
"Seth A.",
""
]
] | A phenomenology for the deep spatial geometry of loop quantum gravity is introduced. In the context of a simple model, an atom of space, it is shown how purely combinatorial structures can affect observations. The angle operator is used to develop a model of angular corrections to local, continuum flat-space 3-geometri... |
2005.04747 | Jose Edgar Madriz Aguilar Dr. | Jos\'e Edgar Madriz Aguilar, J. Zamarripa, M. Montes, J. A. Licea, C.
De Loza and A. Peraza | Extending $\Lambda(t)-$CDM to the inflationary epoch using dynamical
foliations and a pre-inflationary vacuum energy from 5D geometrical vacuum as
a unifying mechanism | 8 pages, no figures. This is a revised version | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter assuming a 5D quantum pre-inflationary vacuum energy, we
propose a manner to extend some $\Lambda(t)$-CDM models to the inflationary
period by using dynamical foliations of the five-dimensional (5D) Ricci-flat
space-time manifold, regarding a non-compact extra space-like coor\-dinate. In
this formalism... | [
{
"created": "Sun, 10 May 2020 18:44:10 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Aug 2021 00:01:41 GMT",
"version": "v2"
}
] | 2021-08-20 | [
[
"Aguilar",
"José Edgar Madriz",
""
],
[
"Zamarripa",
"J.",
""
],
[
"Montes",
"M.",
""
],
[
"Licea",
"J. A.",
""
],
[
"De Loza",
"C.",
""
],
[
"Peraza",
"A.",
""
]
] | In this letter assuming a 5D quantum pre-inflationary vacuum energy, we propose a manner to extend some $\Lambda(t)$-CDM models to the inflationary period by using dynamical foliations of the five-dimensional (5D) Ricci-flat space-time manifold, regarding a non-compact extra space-like coor\-dinate. In this formalism w... |
1606.01147 | Huibert Het Lam | Huibert het Lam and Tomislav Prokopec | Singularities in FLRW Spacetimes | null | null | 10.1016/j.physletb.2017.10.070 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that past-incompleteness of geodesics in FLRW spacetimes does
not necessarily imply that these spacetimes start from a singularity. Namely,
if a test particle that follows such a trajectory has a non-vanishing velocity,
its energy was super-Planckian at some time in the past if it kept following
that geo... | [
{
"created": "Fri, 3 Jun 2016 15:40:09 GMT",
"version": "v1"
}
] | 2017-12-06 | [
[
"Lam",
"Huibert het",
""
],
[
"Prokopec",
"Tomislav",
""
]
] | We point out that past-incompleteness of geodesics in FLRW spacetimes does not necessarily imply that these spacetimes start from a singularity. Namely, if a test particle that follows such a trajectory has a non-vanishing velocity, its energy was super-Planckian at some time in the past if it kept following that geode... |
1310.5933 | Ahmet Baykal | Ahmet Baykal | Variational derivatives of gravitational actions | References are reordered and updated. Minor changes in the abstract | Eur. Phys. J. Plus (2013) 128: 125 | 10.1140/epjp/i2013-13125-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A method of calculation for the variational derivatives for gravitational
actions in the pseudo-Riemannian case is proposed as a practical variant of the
first order formalism with constraints. The method is then used to derive the
metric field equations for a generic $f(R)$ model.
| [
{
"created": "Tue, 22 Oct 2013 14:25:23 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Oct 2013 15:07:25 GMT",
"version": "v2"
}
] | 2013-10-30 | [
[
"Baykal",
"Ahmet",
""
]
] | A method of calculation for the variational derivatives for gravitational actions in the pseudo-Riemannian case is proposed as a practical variant of the first order formalism with constraints. The method is then used to derive the metric field equations for a generic $f(R)$ model. |
2111.14351 | Yevgeny Stadnik | Yevgeny V. Stadnik | Comment on ''Quantum sensor networks as exotic field telescopes for
multi-messenger astronomy'' | 10 pages, 1 figure. Added rebuttal to arXiv:2112.02653v1 on page 9.
Comment remains unchanged from v1 | Nature Astronomy 8, 434 (2024) | 10.1038/s41550-024-02245-4 | null | gr-qc astro-ph.IM hep-ph physics.atom-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the recent work [Dailey et al., Nature Astronomy 5, 150 (2021)], it was
claimed that networks of quantum sensors can be used as sensitive
multi-messenger probes of astrophysical phenomena that produce intense bursts
of relativistic bosonic waves which interact non-gravitationally with ordinary
matter. The most pro... | [
{
"created": "Mon, 29 Nov 2021 07:08:14 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 2021 10:07:51 GMT",
"version": "v2"
}
] | 2024-04-24 | [
[
"Stadnik",
"Yevgeny V.",
""
]
] | In the recent work [Dailey et al., Nature Astronomy 5, 150 (2021)], it was claimed that networks of quantum sensors can be used as sensitive multi-messenger probes of astrophysical phenomena that produce intense bursts of relativistic bosonic waves which interact non-gravitationally with ordinary matter. The most promi... |
1905.02380 | Pablo Le\'on | C. Las Heras and P. Le\'on | New algorithms to obtain analytical solutions of Einstein's equations in
isotropic coordinates | 14 pages, 24 figures, results were improved | null | 10.1140/epjc/s10052-019-7507-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main objective of this work, is to show two inequivalent methods to
obtain new spherical symmetric solutions of Einstein's Equations with
anisotropy in the pressures in isotropic coordinates. This was done inspired by
the MGD method, which is known to be valid for line elements in Schwarzschild
coordinates. As ex... | [
{
"created": "Tue, 7 May 2019 06:46:46 GMT",
"version": "v1"
},
{
"created": "Thu, 9 May 2019 03:12:19 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Nov 2019 16:49:32 GMT",
"version": "v3"
}
] | 2020-01-08 | [
[
"Heras",
"C. Las",
""
],
[
"León",
"P.",
""
]
] | The main objective of this work, is to show two inequivalent methods to obtain new spherical symmetric solutions of Einstein's Equations with anisotropy in the pressures in isotropic coordinates. This was done inspired by the MGD method, which is known to be valid for line elements in Schwarzschild coordinates. As exam... |
1309.2698 | Kazuharu Bamba | Kazuharu Bamba, Salvatore Capozziello, Mariafelicia De Laurentis,
Shin'ichi Nojiri and Diego S\'aez-G\'omez | No further gravitational wave modes in $F(T)$ gravity | 7 pages, no figure, version accepted for publication in Physics
Letters B | Physics Letters B 727 (2013) 194-198 | 10.1016/j.physletb.2013.10.022 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the possibility of further gravitational wave modes in $F(T)$
gravity, where $T$ is the torsion scalar in teleparallelism. It is explicitly
demonstrated that gravitational wave modes in $F(T)$ gravity are equivalent to
those in General Relativity. This result is achieved by calculating the
Minkowskian limi... | [
{
"created": "Wed, 11 Sep 2013 00:10:25 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Oct 2013 01:17:54 GMT",
"version": "v2"
}
] | 2013-11-14 | [
[
"Bamba",
"Kazuharu",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Nojiri",
"Shin'ichi",
""
],
[
"Sáez-Gómez",
"Diego",
""
]
] | We explore the possibility of further gravitational wave modes in $F(T)$ gravity, where $T$ is the torsion scalar in teleparallelism. It is explicitly demonstrated that gravitational wave modes in $F(T)$ gravity are equivalent to those in General Relativity. This result is achieved by calculating the Minkowskian limit ... |
2401.06845 | Alexandre Toubiana | Alexandre Toubiana, Jonathan R. Gair | Indistinguishability criterion and estimating the presence of biases | Correction of a small typo in the evaluation of the fitting factor of
P\"urrer & Haster. What was reported was 2(1-fitting factor) | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In these notes, we comment on the standard indistinguishability criterion
often used in the gravitational wave community to set accuracy requirements on
waveforms. Revisiting the hypotheses under which it is derived, we propose a
correction to it. Moreover, we outline how the approach we proposed in a recent
work in ... | [
{
"created": "Fri, 12 Jan 2024 19:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jan 2024 09:18:56 GMT",
"version": "v2"
}
] | 2024-01-19 | [
[
"Toubiana",
"Alexandre",
""
],
[
"Gair",
"Jonathan R.",
""
]
] | In these notes, we comment on the standard indistinguishability criterion often used in the gravitational wave community to set accuracy requirements on waveforms. Revisiting the hypotheses under which it is derived, we propose a correction to it. Moreover, we outline how the approach we proposed in a recent work in th... |
gr-qc/0504063 | Niklas Rohr | Niklas Rohr and Claes Uggla | Conformal regularization of Einstein's field equations | New title plus corrections and text added. To appear in CQG | Class.Quant.Grav. 22 (2005) 3775-3787 | 10.1088/0264-9381/22/17/026 | null | gr-qc | null | To study asymptotic structures, we regularize Einstein's field equations by
means of conformal transformations. The conformal factor is chosen so that it
carries a dimensional scale that captures crucial asymptotic features. By
choosing a conformal orthonormal frame we obtain a coupled system of
differential equation... | [
{
"created": "Thu, 14 Apr 2005 12:13:59 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jul 2005 14:21:35 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Rohr",
"Niklas",
""
],
[
"Uggla",
"Claes",
""
]
] | To study asymptotic structures, we regularize Einstein's field equations by means of conformal transformations. The conformal factor is chosen so that it carries a dimensional scale that captures crucial asymptotic features. By choosing a conformal orthonormal frame we obtain a coupled system of differential equations ... |
2103.12017 | Ronaldo S. S. Vieira | Ronaldo S. S. Vieira, Javier Ramos-Caro, Alberto Saa | Post-Newtonian Hamiltonian dynamics: applications to stationary
spacetimes and statistical mechanics | 9 pages, no figures | null | null | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although the post-Newtonian Lagrangian formalism is widely used in
relativistic dynamical and statistical studies of test bodies moving around
arbitrary mass distributions, the corresponding general Hamiltonian formalism
is still relatively uncommon, being restricted basically to the case of N-body
problems. Here, we... | [
{
"created": "Mon, 22 Mar 2021 17:15:25 GMT",
"version": "v1"
}
] | 2021-03-23 | [
[
"Vieira",
"Ronaldo S. S.",
""
],
[
"Ramos-Caro",
"Javier",
""
],
[
"Saa",
"Alberto",
""
]
] | Although the post-Newtonian Lagrangian formalism is widely used in relativistic dynamical and statistical studies of test bodies moving around arbitrary mass distributions, the corresponding general Hamiltonian formalism is still relatively uncommon, being restricted basically to the case of N-body problems. Here, we p... |
0806.2177 | Chen Songbai | Songbai Chen, Bin Wang, Jiliang Jing | Scalar emission in a rotating G\"{o}del black hole | 14 pages, 4 figures, This version accepted for publication in Phys.
Rev. D contains a minor modification and two new references | Phys.Rev.D78:064030,2008 | 10.1103/PhysRevD.78.064030 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the absorption probability and Hawking radiation of the scalar field
in the rotating G\"{o}del black hole in minimal five-dimensional gauged
supergravity. We find that G\"{o}del parameter $j$ imprints in the greybody
factor and Hawking radiation. It plays a different role from the angular
momentum of the bla... | [
{
"created": "Fri, 13 Jun 2008 02:26:38 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Aug 2008 07:36:43 GMT",
"version": "v2"
}
] | 2009-02-20 | [
[
"Chen",
"Songbai",
""
],
[
"Wang",
"Bin",
""
],
[
"Jing",
"Jiliang",
""
]
] | We study the absorption probability and Hawking radiation of the scalar field in the rotating G\"{o}del black hole in minimal five-dimensional gauged supergravity. We find that G\"{o}del parameter $j$ imprints in the greybody factor and Hawking radiation. It plays a different role from the angular momentum of the black... |
1001.0381 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Some remarks on exact wormhole solutions | 3 pages, no figures | Adv.Stud.Theor.Phys.5:365,2011 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exact wormhole solutions, while eagerly sought after, often have the
appearance of being overly specialized or highly artificial. A case for the
possible existence of traversable wormholes would be more compelling if an
abundance of solutions could be found. It is shown in this note that for many
of the wormhole geom... | [
{
"created": "Sun, 3 Jan 2010 15:34:27 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Dec 2010 18:56:11 GMT",
"version": "v2"
},
{
"created": "Fri, 6 May 2011 20:59:50 GMT",
"version": "v3"
},
{
"created": "Sun, 12 Jun 2011 23:16:01 GMT",
"version": "v4"
},
{
"cre... | 2011-06-22 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | Exact wormhole solutions, while eagerly sought after, often have the appearance of being overly specialized or highly artificial. A case for the possible existence of traversable wormholes would be more compelling if an abundance of solutions could be found. It is shown in this note that for many of the wormhole geomet... |
1501.01765 | Manabendra Sharma | Sukanta Panda and Manabendra Sharma | Anisotropic Bouncing Scenario in $F(X)-V(\phi)$ model | 13 pages, 6 figures. arXiv admin note: text overlap with
arXiv:1406.3992 | null | 10.1007/s10509-015-2594-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the cosmology of a class of model with noncanonical scalar
field and matter in an anisotropic time dependent background. Writing the
Einstein Equations in terms of dimensionless dynamical variables appropriately
defined for bouncing solutions, we find all the fixed points. From the bouncing
conditions ... | [
{
"created": "Thu, 8 Jan 2015 08:34:48 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Panda",
"Sukanta",
""
],
[
"Sharma",
"Manabendra",
""
]
] | We investigate the cosmology of a class of model with noncanonical scalar field and matter in an anisotropic time dependent background. Writing the Einstein Equations in terms of dimensionless dynamical variables appropriately defined for bouncing solutions, we find all the fixed points. From the bouncing conditions an... |
2109.13554 | Takeshi Fukuyama | Takeshi Fukuyama | Revisiting the Origin of the Universe and the Arrow of Time | 11pages, 3 figures. Comments are added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconsider the old but yet unsolved problems, origin of the universe and
the arrow of time. We show that only the closed universe is free from the
singularity with the arrow of time symmetric with respect to the maximal size
of the cosmic scale. The Wheeler-DeWitt equation is explicitly solved to obtain
the local ... | [
{
"created": "Tue, 28 Sep 2021 08:20:22 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jan 2023 05:32:45 GMT",
"version": "v2"
}
] | 2023-01-19 | [
[
"Fukuyama",
"Takeshi",
""
]
] | We reconsider the old but yet unsolved problems, origin of the universe and the arrow of time. We show that only the closed universe is free from the singularity with the arrow of time symmetric with respect to the maximal size of the cosmic scale. The Wheeler-DeWitt equation is explicitly solved to obtain the local dy... |
1402.1343 | Abhishek Majhi | Abhishek Majhi | Black Hole Entropy from indistinguishable quantum geometric excitations | 7 pages, 4 figures | Advances in High Energy Physics, vol. 2016, Article ID 2903867, 7
pages, 2016 | 10.1155/2016/2903867 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In loop quantum gravity, the quantum geometry of a black hole horizon consist
of discrete non-perturbative quantum geometric excitations (or punctures)
labeled by spins, which are responsible for the quantum area of the horizon. If
these punctures are compared to a gas of particles, then the spins associated
with the... | [
{
"created": "Thu, 6 Feb 2014 13:06:52 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Feb 2014 02:21:06 GMT",
"version": "v2"
},
{
"created": "Sat, 21 Nov 2015 03:13:38 GMT",
"version": "v3"
}
] | 2016-11-07 | [
[
"Majhi",
"Abhishek",
""
]
] | In loop quantum gravity, the quantum geometry of a black hole horizon consist of discrete non-perturbative quantum geometric excitations (or punctures) labeled by spins, which are responsible for the quantum area of the horizon. If these punctures are compared to a gas of particles, then the spins associated with the p... |
1907.05095 | Alexandre Gavrilik | A.M. Gavrilik, A.V. Nazarenko | Statistics effects in extremal black holes ensemble | v2: 15 pages, 3 figures; refs., text and explanations added to match
reviewers' suggestions, accepted for publication by Int. J. Mod. Phys. A | Int. J. Mod. Phys. A Vol. 34, No. 32, 1950215 (2019) | 10.1142/S0217751X19502154 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the grand canonical ensemble of the static and extremal black
holes, when the equivalence of the electric charge and mass of individual black
hole is postulated. Assuming uniform distribution of black holes in space, we
are finding the effective mass of test particle and mean time dilation at the
admissib... | [
{
"created": "Thu, 11 Jul 2019 10:42:18 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Nov 2019 18:45:06 GMT",
"version": "v2"
}
] | 2020-10-12 | [
[
"Gavrilik",
"A. M.",
""
],
[
"Nazarenko",
"A. V.",
""
]
] | We consider the grand canonical ensemble of the static and extremal black holes, when the equivalence of the electric charge and mass of individual black hole is postulated. Assuming uniform distribution of black holes in space, we are finding the effective mass of test particle and mean time dilation at the admissible... |
gr-qc/0605061 | Nikodem Poplawski | Nikodem J. Poplawski | Propagating torsion in the Einstein frame | 10 pages; published version | J.Math.Phys. 47 (2006) 112504 | 10.1063/1.2365788 | null | gr-qc | null | The Einstein-Cartan-Saa theory of torsion modifies the spacetime volume
element so that it is compatible with the connection. The condition of
connection compatibility gives constraints on torsion, which are also necessary
for the consistence of torsion, minimal coupling, and electromagnetic gauge
invariance. To solv... | [
{
"created": "Wed, 10 May 2006 19:50:28 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Oct 2006 05:26:10 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Poplawski",
"Nikodem J.",
""
]
] | The Einstein-Cartan-Saa theory of torsion modifies the spacetime volume element so that it is compatible with the connection. The condition of connection compatibility gives constraints on torsion, which are also necessary for the consistence of torsion, minimal coupling, and electromagnetic gauge invariance. To solve ... |
0712.2831 | Ricardo E. Gamboa Saravi | Ricardo E. Gamboa Saravi | Static plane symmetric relativistic fluids and empty repelling singular
boundaries | 9 pages, 1 figure, accepted for publication in Classical and Quantum
Gravity | Class.Quant.Grav.25:045005,2008 | 10.1088/0264-9381/25/4/045005 | null | gr-qc | null | We present a detailed analysis of the general exact solution of Einstein's
equation corresponding to a static and plane symmetric distribution of matter
with density proportional to pressure. We study the geodesics in it and we show
that this simple spacetime exhibits very curious properties. In particular, it
has a ... | [
{
"created": "Tue, 18 Dec 2007 15:34:58 GMT",
"version": "v1"
}
] | 2008-11-11 | [
[
"Saravi",
"Ricardo E. Gamboa",
""
]
] | We present a detailed analysis of the general exact solution of Einstein's equation corresponding to a static and plane symmetric distribution of matter with density proportional to pressure. We study the geodesics in it and we show that this simple spacetime exhibits very curious properties. In particular, it has a fr... |
1308.2962 | Manuel Rodrigues | M. E. Rodrigues, I. G. Salako, M. J. S. Houndjo and J. Tossa | Locally Rotationally Symmetric Bianchi Type-I cosmological model in
$f(T)$ gravity: from early to Dark Energy dominated universe | 20 pages, 10 figures, Accepted for publication in International
Journal of Modern Physics D (IJMPD) | Int. J. Mod. Phys. D 23, 1450004 (2014) | 10.1142/S0218271814500047 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the locally rotational symmetry Bianchi type-I dark energy model in
the framework of $f(T)$ theory of gravity, where $T$ denotes the torsion
scalar. A viable cosmological model is undertaken and the isotropization of
this latter is checked, yielding a result that reflects the real evolution of
our universe. ... | [
{
"created": "Tue, 13 Aug 2013 14:05:52 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Sep 2013 19:47:18 GMT",
"version": "v2"
}
] | 2014-01-13 | [
[
"Rodrigues",
"M. E.",
""
],
[
"Salako",
"I. G.",
""
],
[
"Houndjo",
"M. J. S.",
""
],
[
"Tossa",
"J.",
""
]
] | We study the locally rotational symmetry Bianchi type-I dark energy model in the framework of $f(T)$ theory of gravity, where $T$ denotes the torsion scalar. A viable cosmological model is undertaken and the isotropization of this latter is checked, yielding a result that reflects the real evolution of our universe. Mo... |
1610.08093 | Ahmad Sheykhi | M. Abdollahi Zadeh, A. Sheykhi and H. Moradpour | Holographic dark energy with the sign-changeable interaction term | 9 pages, 11 figures | IJMPD Vol. 26, No. 8 (2017) 1750080 | 10.1142/S0218271817500808 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We use three IR cutoffs, including the future event horizon, the Hubble and
Granda-Oliveros (GO) cutoffs, to construct three holographic models of dark
energy. Additionally, we consider a Friedmann-Robertson-Walker (FRW) universe
filled by a dark matter (DM) and a dark energy that interact with each other
through a m... | [
{
"created": "Mon, 24 Oct 2016 19:20:54 GMT",
"version": "v1"
}
] | 2017-06-06 | [
[
"Zadeh",
"M. Abdollahi",
""
],
[
"Sheykhi",
"A.",
""
],
[
"Moradpour",
"H.",
""
]
] | We use three IR cutoffs, including the future event horizon, the Hubble and Granda-Oliveros (GO) cutoffs, to construct three holographic models of dark energy. Additionally, we consider a Friedmann-Robertson-Walker (FRW) universe filled by a dark matter (DM) and a dark energy that interact with each other through a mut... |
2211.08477 | Abhishek Hegade K R | Abhishek Hegade K R, Justin L. Ripley, and Nicol\'as Yunes | Where and why does Einstein-Scalar-Gauss-Bonnet theory break down? | matches published version | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematic exploration of the loss of predictivity in
Einstein-scalar-Gauss-Bonnet (ESGB) gravity. We first formulate a gauge
covariant method of characterizing the breakdown of the hyperbolicity of the
equations of motion in the theory. With this formalism, we show that strong
geodesic focusing leads to... | [
{
"created": "Tue, 15 Nov 2022 20:03:38 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Feb 2023 21:42:25 GMT",
"version": "v2"
},
{
"created": "Mon, 1 May 2023 17:43:51 GMT",
"version": "v3"
}
] | 2023-05-02 | [
[
"R",
"Abhishek Hegade K",
""
],
[
"Ripley",
"Justin L.",
""
],
[
"Yunes",
"Nicolás",
""
]
] | We present a systematic exploration of the loss of predictivity in Einstein-scalar-Gauss-Bonnet (ESGB) gravity. We first formulate a gauge covariant method of characterizing the breakdown of the hyperbolicity of the equations of motion in the theory. With this formalism, we show that strong geodesic focusing leads to t... |
2109.01931 | Oleksandr Stashko | O.S. Stashko, V.I. Zhdanov | Singularities in static spherically symmetric configurations of General
Relativity with strongly nonlinear scalar fields | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | There are a number of publications on relativistic objects dealing either
with black holes or naked singularities in the center. Here we show that there
exist static spherically symmetric solutions of Einstein equations with a
strongly nonlinear scalar field, which allow the appearance of singularities of
a new type ... | [
{
"created": "Sat, 4 Sep 2021 20:56:00 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Oct 2021 10:59:43 GMT",
"version": "v2"
}
] | 2021-10-05 | [
[
"Stashko",
"O. S.",
""
],
[
"Zhdanov",
"V. I.",
""
]
] | There are a number of publications on relativistic objects dealing either with black holes or naked singularities in the center. Here we show that there exist static spherically symmetric solutions of Einstein equations with a strongly nonlinear scalar field, which allow the appearance of singularities of a new type (`... |
1303.4992 | Jan Zschoche | Jan Zschoche | The Chaplygin Gas Equation of State for the Quantized Free Scalar Field
on Cosmological Spacetimes | 33 pages; paper shortened, comments added | null | 10.1007/s00023-013-0281-5 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We try to answer the question whether the quantized free scalar field on a
spatially flat Friedmann-Robertson-Walker (FRW) spacetime is a matter model
that can induce a Chaplygin gas equation of state. For this purpose we first
describe how one can obtain every possible homogeneous and isotropic Hadamard
(HIH) state ... | [
{
"created": "Wed, 20 Mar 2013 16:57:15 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Aug 2013 09:23:20 GMT",
"version": "v2"
}
] | 2013-08-05 | [
[
"Zschoche",
"Jan",
""
]
] | We try to answer the question whether the quantized free scalar field on a spatially flat Friedmann-Robertson-Walker (FRW) spacetime is a matter model that can induce a Chaplygin gas equation of state. For this purpose we first describe how one can obtain every possible homogeneous and isotropic Hadamard (HIH) state on... |
1310.5064 | Elizabeth Winstanley | Elizabeth Winstanley | Kermions | 6 pages, 2 figures, minor changes, contribution to the Proceedings of
the Karl Schwarzschild Meeting (Frankfurt, July 22-26, 2013) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of quantum field theory in curved space-time, we study the
quantization of a massless fermion field on a non-extremal Kerr black hole. The
key theme in this note is the fundamental difference between scalar and fermion
fields for the process of defining quantum states. In particular, we define two
ne... | [
{
"created": "Fri, 18 Oct 2013 15:50:05 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Oct 2013 11:02:19 GMT",
"version": "v2"
}
] | 2013-10-31 | [
[
"Winstanley",
"Elizabeth",
""
]
] | In the framework of quantum field theory in curved space-time, we study the quantization of a massless fermion field on a non-extremal Kerr black hole. The key theme in this note is the fundamental difference between scalar and fermion fields for the process of defining quantum states. In particular, we define two new ... |
2208.02927 | Marissa Walker | Marissa Walker, Vijay Varma, Geoffrey Lovelace, Mark A. Scheel | Numerical-relativity surrogate modeling with nearly extremal black-hole
spins | null | null | 10.1088/1361-6382/acb3a7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerical relativity (NR) simulations of binary black hole (BBH) systems
provide the most accurate gravitational wave predictions, but at a high
computational cost -- especially when the black holes have nearly extremal
spins (i.e. spins near the theoretical upper limit) or very unequal masses.
Recently, the techniqu... | [
{
"created": "Thu, 4 Aug 2022 23:13:20 GMT",
"version": "v1"
}
] | 2023-02-15 | [
[
"Walker",
"Marissa",
""
],
[
"Varma",
"Vijay",
""
],
[
"Lovelace",
"Geoffrey",
""
],
[
"Scheel",
"Mark A.",
""
]
] | Numerical relativity (NR) simulations of binary black hole (BBH) systems provide the most accurate gravitational wave predictions, but at a high computational cost -- especially when the black holes have nearly extremal spins (i.e. spins near the theoretical upper limit) or very unequal masses. Recently, the technique ... |
gr-qc/0207063 | Sergio De Filippo | Filippo Maimone, Sergio De Filippo | Nonunitary Newtonian Gravity | 6 pages, to appear in Proceedings of the First International
Conference on Quantum Limits to the Second Law, July 29-31, 2002, University
of San Diego, San Diego, CA | AIP Conf.Proc. 643 (2003) 379-384 | null | null | gr-qc | null | It is shown that the Newtonian limit of a stable realization of HD gravity
leads to a sharp transition, around 10^{11} proton masses, from the wavelike
properties of microscopic particles to the classical behaviour of macroscopic
bodies. Besides, due to nonunitarity, a pure state is expected to evolve into a
microcan... | [
{
"created": "Wed, 17 Jul 2002 13:30:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Maimone",
"Filippo",
""
],
[
"De Filippo",
"Sergio",
""
]
] | It is shown that the Newtonian limit of a stable realization of HD gravity leads to a sharp transition, around 10^{11} proton masses, from the wavelike properties of microscopic particles to the classical behaviour of macroscopic bodies. Besides, due to nonunitarity, a pure state is expected to evolve into a microcanon... |
2311.08073 | Giuseppe Fanizza | Giuseppe Fanizza, Giovanni Marozzi, Matheus Medeiros | $\delta N$ formalism on the past light-cone | 33 pages, no figures. References and comments added. Accepted for
publication in General Relativity and Gravitation | Gen. Rel. Grav. 56, 53 (2024) | 10.1007/s10714-024-03239-3 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We apply the gradient expansion approximation to the light-cone gauge,
obtaining a separate universe picture at non-linear order in perturbation
theory within this framework. Thereafter, we use it to generalize the $\delta
N$ formalism in terms of light-cone perturbations. As a consistency check, we
demonstrate the c... | [
{
"created": "Tue, 14 Nov 2023 10:51:51 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Apr 2024 16:02:36 GMT",
"version": "v2"
}
] | 2024-05-07 | [
[
"Fanizza",
"Giuseppe",
""
],
[
"Marozzi",
"Giovanni",
""
],
[
"Medeiros",
"Matheus",
""
]
] | We apply the gradient expansion approximation to the light-cone gauge, obtaining a separate universe picture at non-linear order in perturbation theory within this framework. Thereafter, we use it to generalize the $\delta N$ formalism in terms of light-cone perturbations. As a consistency check, we demonstrate the con... |
gr-qc/0510019 | Leor Barack | Leor Barack and Carlos O. Lousto | Perturbations of Schwarzschild black holes in the Lorenz gauge:
Formulation and numerical implementation | 29 pages, 21 eps figures | Phys.Rev. D72 (2005) 104026 | 10.1103/PhysRevD.72.104026 | null | gr-qc | null | We reformulate the theory of Schwarzschild black hole perturbations in terms
of the metric perturbation in the Lorenz gauge. In this formulation, each
tensor-harmonic mode of the perturbation is constructed algebraically from 10
scalar functions, satisfying a set of 10 wavelike equations, which are
decoupled at their... | [
{
"created": "Wed, 5 Oct 2005 18:41:05 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Nov 2005 17:01:47 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Barack",
"Leor",
""
],
[
"Lousto",
"Carlos O.",
""
]
] | We reformulate the theory of Schwarzschild black hole perturbations in terms of the metric perturbation in the Lorenz gauge. In this formulation, each tensor-harmonic mode of the perturbation is constructed algebraically from 10 scalar functions, satisfying a set of 10 wavelike equations, which are decoupled at their p... |
gr-qc/9402022 | H. Shinkai | Hisa-aki SHINKAI and Kei-ichi MAEDA | Generality of Inflation in a Planar Universe | 16 pages, LaTeX style, WU-AP/34/93(revised version). Figures are
available (hard copies) upon requests [62L508@cfi.waseda.ac.jp (H.Shinkai)] | Phys.Rev. D49 (1994) 6367-6378 | 10.1103/PhysRevD.49.6367 | null | gr-qc | null | We study a generality of an inflationary scenario by integrating the Einstein
equations numerically in a plane-symmetric spacetime. We consider the
inhomogeneous spacetimes due to (i) localized gravitational waves with a
positive cosmological constant $\Lambda$, and (ii) an inhomogeneous inflaton
field $\Phi$ with a ... | [
{
"created": "Thu, 10 Feb 1994 01:19:51 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"SHINKAI",
"Hisa-aki",
""
],
[
"MAEDA",
"Kei-ichi",
""
]
] | We study a generality of an inflationary scenario by integrating the Einstein equations numerically in a plane-symmetric spacetime. We consider the inhomogeneous spacetimes due to (i) localized gravitational waves with a positive cosmological constant $\Lambda$, and (ii) an inhomogeneous inflaton field $\Phi$ with a po... |
1412.2605 | Behnam Pourhassan | B. Pourhassan | Extended Chaplygin Gas in Horava-Lifshitz Gravity | 18 pages, 3 figures, Accepted for Publication in Physics of the Dark
Universe | Physics of the Dark Universe 13 (2016) 132 | 10.1016/j.dark.2016.06.002 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate cosmological models of the extended Chaplygin
gas in a universe governed by Horava-Lifshitz gravity. The equation of state
for an extended Chaplygin gas is a $(n+2)$-variable equation determined by
$A_{n}$, $\alpha$, and $B$. In this work, we are interested to the case of
second order $(... | [
{
"created": "Mon, 8 Dec 2014 15:31:12 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Apr 2015 08:54:46 GMT",
"version": "v2"
},
{
"created": "Sat, 11 Jul 2015 06:25:05 GMT",
"version": "v3"
},
{
"created": "Sat, 25 Jun 2016 07:23:55 GMT",
"version": "v4"
}
] | 2016-07-08 | [
[
"Pourhassan",
"B.",
""
]
] | In this paper, we investigate cosmological models of the extended Chaplygin gas in a universe governed by Horava-Lifshitz gravity. The equation of state for an extended Chaplygin gas is a $(n+2)$-variable equation determined by $A_{n}$, $\alpha$, and $B$. In this work, we are interested to the case of second order $(n=... |
0711.1207 | Shabbir Ghulam | Ghulam Shabbir, Shaukat Iqbal | A note on proper conformal vector fields in cylindrically symmetric
static space-times | 5 pages | null | null | null | gr-qc | null | A study of proper conformal vector field in non conformally flat
cylindrically symmetric static space-times is given by using direct integration
technique. Using the above mentioned technique we have shown that a very
special class of the above space-time admits proper conformal vector field.
| [
{
"created": "Thu, 8 Nov 2007 06:26:32 GMT",
"version": "v1"
}
] | 2007-11-09 | [
[
"Shabbir",
"Ghulam",
""
],
[
"Iqbal",
"Shaukat",
""
]
] | A study of proper conformal vector field in non conformally flat cylindrically symmetric static space-times is given by using direct integration technique. Using the above mentioned technique we have shown that a very special class of the above space-time admits proper conformal vector field. |
2006.16017 | Aditya Tamar | Aditya Tamar | On Challenges to Separability of the Dirac Equation in Kerr Geometry
under Compact Hyperboloidal Coordinates | 10 pages, Submitted to IJP. Comments on the validity of the result
are especially encouraged | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Dirac equation governs the behaviour of spin-1/2 particles. The
equation's separability into decoupled radial and angular differential
equations is a crucial step in analytical and numerical computations of
quantities like eigenvalues, quasinormal modes and bound states. However, this
separation has been performe... | [
{
"created": "Mon, 29 Jun 2020 13:01:12 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jul 2020 12:07:16 GMT",
"version": "v2"
}
] | 2020-07-02 | [
[
"Tamar",
"Aditya",
""
]
] | The Dirac equation governs the behaviour of spin-1/2 particles. The equation's separability into decoupled radial and angular differential equations is a crucial step in analytical and numerical computations of quantities like eigenvalues, quasinormal modes and bound states. However, this separation has been performed ... |
gr-qc/0611013 | Jesus Martin-Martin | J. A. Cabezas, J. Martin-Martin, A. Molina, E. Ruiz | An approximate global solution of Einstein's equations for a finite body | 32 pages, no figures. Submitted to GRG | Gen.Rel.Grav.39:707-736,2007 | 10.1007/s10714-007-0414-6 | null | gr-qc | null | We obtain an approximate global stationary and axisymmetric solution of
Einstein's equations which can be considered as a simple star model: a
self-gravitating perfect fluid ball with constant mass density rotating in
rigid motion. Using the post-Minkowskian formalism (weak-field approximation)
and considering rotati... | [
{
"created": "Thu, 2 Nov 2006 12:41:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Cabezas",
"J. A.",
""
],
[
"Martin-Martin",
"J.",
""
],
[
"Molina",
"A.",
""
],
[
"Ruiz",
"E.",
""
]
] | We obtain an approximate global stationary and axisymmetric solution of Einstein's equations which can be considered as a simple star model: a self-gravitating perfect fluid ball with constant mass density rotating in rigid motion. Using the post-Minkowskian formalism (weak-field approximation) and considering rotation... |
1407.6405 | Raissa Mendes | Raissa F. P. Mendes, George E. A. Matsas, Daniel A. T. Vanzella | Instability of nonminimally coupled scalar fields in the spacetime of
slowly rotating compact objects | 11 pages, 6 figures | Phys. Rev. D 90, 044053 (2014) | 10.1103/PhysRevD.90.044053 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nonminimally coupled free scalar fields may be unstable in the spacetime of
compact objects. Such instability can be triggered by classical seeds or, more
simply, by quantum fluctuations giving rise to the so-called {\em vacuum
awakening effect}. Here, we investigate how the parameter space which
characterizes the in... | [
{
"created": "Wed, 23 Jul 2014 23:04:18 GMT",
"version": "v1"
}
] | 2014-09-16 | [
[
"Mendes",
"Raissa F. P.",
""
],
[
"Matsas",
"George E. A.",
""
],
[
"Vanzella",
"Daniel A. T.",
""
]
] | Nonminimally coupled free scalar fields may be unstable in the spacetime of compact objects. Such instability can be triggered by classical seeds or, more simply, by quantum fluctuations giving rise to the so-called {\em vacuum awakening effect}. Here, we investigate how the parameter space which characterizes the inst... |
0903.3832 | Carlo Rovelli | Carlo Rovelli | "Forget time" | 'First Community Prize' of the FQXi 'The Nature of Time' Essay
Contest | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following a line of research that I have developed for several years, I argue
that the best strategy for understanding quantum gravity is to build a picture
of the physical world where the notion of time plays no role. I summarize here
this point of view, explaining why I think that in a fundamental description of
na... | [
{
"created": "Mon, 23 Mar 2009 19:59:42 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Mar 2009 23:07:18 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Mar 2009 20:27:58 GMT",
"version": "v3"
}
] | 2009-03-27 | [
[
"Rovelli",
"Carlo",
""
]
] | Following a line of research that I have developed for several years, I argue that the best strategy for understanding quantum gravity is to build a picture of the physical world where the notion of time plays no role. I summarize here this point of view, explaining why I think that in a fundamental description of natu... |
2404.08243 | Zheng-Wen Long | Hao Chen, Meng-Yao Zhang, Hassan Hassanabadi and Zheng-Wen Long | Thermodynamic topology of Phantom AdS Black Holes in Massive Gravity | 10pages, 19 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we explore the thermodynamic topology of phantom AdS black
holes in the context of massive gravity. To this end, we evaluate these black
holes in two distinct ensembles: the canonical and grand canonical ensembles
(GCE). We begin by examining the topological charge linked to the critical
point and confi... | [
{
"created": "Fri, 12 Apr 2024 05:12:22 GMT",
"version": "v1"
}
] | 2024-04-15 | [
[
"Chen",
"Hao",
""
],
[
"Zhang",
"Meng-Yao",
""
],
[
"Hassanabadi",
"Hassan",
""
],
[
"Long",
"Zheng-Wen",
""
]
] | In this work, we explore the thermodynamic topology of phantom AdS black holes in the context of massive gravity. To this end, we evaluate these black holes in two distinct ensembles: the canonical and grand canonical ensembles (GCE). We begin by examining the topological charge linked to the critical point and confirm... |
gr-qc/0111080 | Sushant G. Ghosh | S.G. Ghosh (Science College, Nagpur, India) and R. V. Saraykar (Nagpur
University, Nagpur, India) | Higher dimensional radiation collapse and cosmic censorship | 4 pages, ReVTeX, Phys Rev D Vol 62 107502 (2000) | Phys.Rev.D62:107502,2000 | 10.1103/PhysRevD.62.107502 | null | gr-qc | null | We study the occurrence of naked singularities in the spherically symmetric
collapse of radiation shells in a higher dimensional spacetime. The necessary
conditions for the formation of a naked singularity or a black hole are
obtained. The naked singularities are found to be strong in the Tipler's sense
and thus viol... | [
{
"created": "Sat, 24 Nov 2001 09:49:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ghosh",
"S. G.",
"",
"Science College, Nagpur, India"
],
[
"Saraykar",
"R. V.",
"",
"Nagpur\n University, Nagpur, India"
]
] | We study the occurrence of naked singularities in the spherically symmetric collapse of radiation shells in a higher dimensional spacetime. The necessary conditions for the formation of a naked singularity or a black hole are obtained. The naked singularities are found to be strong in the Tipler's sense and thus violat... |
gr-qc/0312068 | Albert V. Minkevich | A. V. Minkevich | Problem of Cosmological Singularity, Inflationary Cosmology and Gauge
Theories of Gravitation | 16 pages, LaTeX2e, some additions are made | null | null | null | gr-qc astro-ph hep-th | null | Problem of cosmological singularity is discussed in the framework of gauge
theories of gravitation. Generalizing cosmological Friedmann equations (GCFE)
for homogeneous isotropic models including scalar fields and usual gravitating
matter are introduced. It is shown that by certain restrictions on equation of
state o... | [
{
"created": "Mon, 15 Dec 2003 17:05:19 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Dec 2003 09:04:02 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Dec 2003 15:12:02 GMT",
"version": "v3"
},
{
"created": "Thu, 5 Feb 2004 16:56:30 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Minkevich",
"A. V.",
""
]
] | Problem of cosmological singularity is discussed in the framework of gauge theories of gravitation. Generalizing cosmological Friedmann equations (GCFE) for homogeneous isotropic models including scalar fields and usual gravitating matter are introduced. It is shown that by certain restrictions on equation of state of ... |
0708.0457 | Oyvind Gron | Oyvind G. Gron | The Principle of Relativity and Inertial Dragging | 17 pages | Am.J.Phys.77:373-380,2009 | 10.1119/1.2996480 | null | gr-qc | null | Machs principle and the principle of relativity have been discussed by H. I.
Hartman and C. Nissim-Sabat in this journal. Several phenomena were said to
violate the principle of relativity as applied to rotating motion. These claims
have recently been contested. However, in neither of these articles have the
general ... | [
{
"created": "Fri, 3 Aug 2007 06:19:18 GMT",
"version": "v1"
}
] | 2009-04-24 | [
[
"Gron",
"Oyvind G.",
""
]
] | Machs principle and the principle of relativity have been discussed by H. I. Hartman and C. Nissim-Sabat in this journal. Several phenomena were said to violate the principle of relativity as applied to rotating motion. These claims have recently been contested. However, in neither of these articles have the general re... |
2307.16292 | Sayantani Lahiri | Sayantani Lahiri, Claus Laemmerzahl | Stationary equilibrium torus supported by Weyssenhoff ideal spin fluid
in Schwarzschild spacetime -- I: Case of constant specific angular momentum
distribution | 15 pages, 16 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We consider a non-self-gravitating geometrically thick torus described by
Weyssenhoff ideal spin fluid in a black hole spacetime. The Weyssenhof spin
fluid shares the same symmetries of the background geometry, i,e. stationarity
and axisymmetry and further describes circular orbital motion in the black hole
spacetime... | [
{
"created": "Sun, 30 Jul 2023 18:01:02 GMT",
"version": "v1"
}
] | 2023-08-01 | [
[
"Lahiri",
"Sayantani",
""
],
[
"Laemmerzahl",
"Claus",
""
]
] | We consider a non-self-gravitating geometrically thick torus described by Weyssenhoff ideal spin fluid in a black hole spacetime. The Weyssenhof spin fluid shares the same symmetries of the background geometry, i,e. stationarity and axisymmetry and further describes circular orbital motion in the black hole spacetime. ... |
gr-qc/9810030 | Vesselin Petkov | Vesselin Petkov | On the gravitational redshift | 4 pages, LaTeX; As it turns out that an overlooked consequence of
Einstein's elevator thought experiment - that the propagation of light in a
gravitational field is anisotropic - can be rigorously derived in the
framework of general relativity, the gravitational redshift is now discussed
in terms of that conseq... | Chap. 7.7 of "Relativity and the Nature of Spacetime," 2nd ed
(Springer, 2009) | null | null | gr-qc | null | The purpose of this paper is twofold - to demonstrate that in the
gravitational redshift it is the frequency a photon that is constant, and to
describe the mechanism responsible for the change of its wavelength.
| [
{
"created": "Thu, 8 Oct 1998 07:18:32 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jan 2000 02:04:28 GMT",
"version": "v10"
},
{
"created": "Fri, 21 Jan 2000 05:56:20 GMT",
"version": "v11"
},
{
"created": "Sun, 23 Jan 2000 23:58:53 GMT",
"version": "v12"
},
{
... | 2011-11-18 | [
[
"Petkov",
"Vesselin",
""
]
] | The purpose of this paper is twofold - to demonstrate that in the gravitational redshift it is the frequency a photon that is constant, and to describe the mechanism responsible for the change of its wavelength. |
1507.00291 | Sabir Ramazanov Dr. | Sabir Ramazanov | Initial Conditions for Imperfect Dark Matter | 16 pages; major revision, references added, conclusions unchanged | JCAP12(2015)007 | 10.1088/1475-7516/2015/12/007 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss initial conditions for the recently proposed Imperfect Dark Matter
(Modified Dust). We show that they are adiabatic under fairly moderate
assumptions about the cosmological evolution of the Universe at the relevant
times.
| [
{
"created": "Tue, 30 Jun 2015 14:01:39 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Oct 2015 12:47:40 GMT",
"version": "v2"
}
] | 2015-12-09 | [
[
"Ramazanov",
"Sabir",
""
]
] | We discuss initial conditions for the recently proposed Imperfect Dark Matter (Modified Dust). We show that they are adiabatic under fairly moderate assumptions about the cosmological evolution of the Universe at the relevant times. |
1308.5573 | Javad Taghizadeh firouzjaee | Javad T. Firouzjaee | Comment on "Inflation with a graceful exit and entrance driven by
Hawking radiation" | null | Physical Review D 89, 068301 (2014) | 10.1103/PhysRevD.89.068301 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/3.0/ | Modak and Singleton [Phys. Rev. D 86, 123515 (2012)] have presented
Hawking-like radiation for cosmological inflation which has a natural "turn on"
and a natural "turn off" mechanism. This Hawking-like radiation results in an
effective negative pressure "fluid" which leads to a rapid period of expansion
in the very e... | [
{
"created": "Mon, 26 Aug 2013 13:14:52 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Apr 2014 06:44:49 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Firouzjaee",
"Javad T.",
""
]
] | Modak and Singleton [Phys. Rev. D 86, 123515 (2012)] have presented Hawking-like radiation for cosmological inflation which has a natural "turn on" and a natural "turn off" mechanism. This Hawking-like radiation results in an effective negative pressure "fluid" which leads to a rapid period of expansion in the very ear... |
1304.2125 | Narayan Banerjee | Shubhayu Chatterjee and Narayan Banerjee | Modified Ricci flow and asymptotically non-flat spaces | 5 pages, no figure | Canadian Journal of Physics, vol 91, p198-200 (2013) | 10.1139/cjp-2012-0262 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work extends the application of a modified Ricci flow equation to
an asymptotically non flat space, namely Marder's cylindrially symmetric space.
It is found that the flow equation has a solution at least in a particular
case.
| [
{
"created": "Mon, 8 Apr 2013 07:41:45 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Chatterjee",
"Shubhayu",
""
],
[
"Banerjee",
"Narayan",
""
]
] | The present work extends the application of a modified Ricci flow equation to an asymptotically non flat space, namely Marder's cylindrially symmetric space. It is found that the flow equation has a solution at least in a particular case. |
gr-qc/0211014 | Cuauhtemoc Campuzano Vargas | Alberto A. Garcia and Cuauhtemoc Campuzano | All Static Circularly Symmetric Perfect Fluid Solutions of 2+1 Gravity | revtex4, 8 pages | Phys.Rev. D67 (2003) 064014 | 10.1103/PhysRevD.67.064014 | null | gr-qc | null | Via a straightforward integration of the Einstein equations with cosmological
constant, all static circularly symmetric perfect fluid 2+1 solutions are
derived. The structural functions of the metric depend on the energy density,
which remains in general arbitrary. Spacetimes for fluids fulfilling linear and
polytrop... | [
{
"created": "Tue, 5 Nov 2002 03:48:02 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Garcia",
"Alberto A.",
""
],
[
"Campuzano",
"Cuauhtemoc",
""
]
] | Via a straightforward integration of the Einstein equations with cosmological constant, all static circularly symmetric perfect fluid 2+1 solutions are derived. The structural functions of the metric depend on the energy density, which remains in general arbitrary. Spacetimes for fluids fulfilling linear and polytropic... |
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