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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1606.05269 | Francisco Lobo | Marzieh Peyravi, Nematollah Riazi, Francisco S. N. Lobo | Evolution of spherical domain walls in solitonic symmetron models | 15 pages, 14 figures. V2: 18 pages, 18 figures, extensive discussion
added; published in PRD | Phys. Rev. D 95, 064047 (2017) | 10.1103/PhysRevD.95.064047 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, inspired by the symmetron model, we analyse the evolution of
spherical domain walls by considering specific potentials that ensure symmetry
breaking and the occurrence of degenerate vacua that are necessary for the
formation of domain walls. By considering a simple analytical model of
spherical domain w... | [
{
"created": "Thu, 16 Jun 2016 17:01:18 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Mar 2017 17:33:41 GMT",
"version": "v2"
}
] | 2017-03-28 | [
[
"Peyravi",
"Marzieh",
""
],
[
"Riazi",
"Nematollah",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | In this work, inspired by the symmetron model, we analyse the evolution of spherical domain walls by considering specific potentials that ensure symmetry breaking and the occurrence of degenerate vacua that are necessary for the formation of domain walls. By considering a simple analytical model of spherical domain wal... |
2010.10868 | Chandra Prakash | Chandra Prakash | Generalization of brick wall method in Kerr-Newman Black Hole for
entropy calculation | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the brick wall method, we will calculate the entropy of Kerr-Newman
black Hole and arrive at the already well established result. During the
calculation, we will arrive at the generalized equation for FNSR and FSR mode
of free energy, which can be used to evaluate the free energy of any black
hole. And we will ... | [
{
"created": "Wed, 21 Oct 2020 09:54:09 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2022 06:58:56 GMT",
"version": "v2"
}
] | 2022-06-30 | [
[
"Prakash",
"Chandra",
""
]
] | Using the brick wall method, we will calculate the entropy of Kerr-Newman black Hole and arrive at the already well established result. During the calculation, we will arrive at the generalized equation for FNSR and FSR mode of free energy, which can be used to evaluate the free energy of any black hole. And we will al... |
0810.2691 | Gonzalo Garc\'ia-Reyes | Gonzalo Garc\'ia-Reyes and Guillermo A. Gonz\'alez | Rotating and counterrotating relativistic thin disks as sources of
stationary electrovacuum spacetimes | 22 pages, 7 figures, Latex | Braz.J.Phys.37:1094,2007 | 10.1590/S0103-97332007000700004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A detailed study is presented of the counterrotating model (CRM) for
electrovacuum stationary axially symmetric relativistic thin disks of infinite
extension without radial stress, in the case when the eigenvalues of the
energy-momentum tensor of the disk are real quantities, so that there is not
heat flow. We find a... | [
{
"created": "Wed, 15 Oct 2008 13:33:45 GMT",
"version": "v1"
}
] | 2016-08-14 | [
[
"García-Reyes",
"Gonzalo",
""
],
[
"González",
"Guillermo A.",
""
]
] | A detailed study is presented of the counterrotating model (CRM) for electrovacuum stationary axially symmetric relativistic thin disks of infinite extension without radial stress, in the case when the eigenvalues of the energy-momentum tensor of the disk are real quantities, so that there is not heat flow. We find a g... |
1707.04494 | Sumanta Chakraborty | Indrani Banerjee, Sumanta Chakraborty and Soumitra SenGupta | Excavating black hole continuum spectrum: Possible signatures of scalar
hairs and of higher dimensions | v2, Revised, Published in PRD; 30 pages, 9 figures; | Phys. Rev. D 96, 084035 (2017) | 10.1103/PhysRevD.96.084035 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Continuum spectrum from black hole accretion disc holds enormous information
regarding the strong gravity regime around the black hole and hence about the
nature of gravitational interaction in extreme situations. Since in such strong
gravity regime the dynamics of gravity should be modified from the \EH one, its
eff... | [
{
"created": "Thu, 13 Jul 2017 01:38:42 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Oct 2017 04:11:21 GMT",
"version": "v2"
}
] | 2017-10-19 | [
[
"Banerjee",
"Indrani",
""
],
[
"Chakraborty",
"Sumanta",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | Continuum spectrum from black hole accretion disc holds enormous information regarding the strong gravity regime around the black hole and hence about the nature of gravitational interaction in extreme situations. Since in such strong gravity regime the dynamics of gravity should be modified from the \EH one, its effec... |
1006.3749 | Prasanta Mahato Prin. | Prasanta Mahato and Partha Bhattacharya | Torsion, Chern-Simons Term and Diffeomorphism Invariance | 8 pages | Mod.Phys.Lett.A26:415-421,2011 | 10.1142/S0217732311034852 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the $torsion \otimes curvature$ approach of gravity Chern-Simons
modification has been considered here. It has been found that Chern-Simons
contribution to the bianchi identity has become cancelled from that of the
scalar field part. But "homogeneity and isotropy" consideration of present day
cosmology is a conseq... | [
{
"created": "Fri, 18 Jun 2010 17:14:34 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Dec 2010 17:39:28 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Feb 2011 02:09:22 GMT",
"version": "v3"
}
] | 2011-03-02 | [
[
"Mahato",
"Prasanta",
""
],
[
"Bhattacharya",
"Partha",
""
]
] | In the $torsion \otimes curvature$ approach of gravity Chern-Simons modification has been considered here. It has been found that Chern-Simons contribution to the bianchi identity has become cancelled from that of the scalar field part. But "homogeneity and isotropy" consideration of present day cosmology is a conseque... |
2102.12100 | Ion I. Cotaescu | Ion I. Cotaescu | Quantum theory of redshift in de Sitter expanding universe | 26 pages, no figures | null | 10.1140/epjc/s10052-021-09307-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum theory of the Maxwell free field in Coulomb gauge on the de
Sitter expanding universe is completed with the technical elements needed for
building a coherent quantum theory of redshift. Paying a special attention to
the conserved observables and defining the projection operator selecting the
detected mome... | [
{
"created": "Wed, 24 Feb 2021 07:09:02 GMT",
"version": "v1"
}
] | 2021-07-14 | [
[
"Cotaescu",
"Ion I.",
""
]
] | The quantum theory of the Maxwell free field in Coulomb gauge on the de Sitter expanding universe is completed with the technical elements needed for building a coherent quantum theory of redshift. Paying a special attention to the conserved observables and defining the projection operator selecting the detected moment... |
2006.13638 | M. Ghasemi-Nodehi | M. Ghasemi-Nodehi, Youjun Lu, Ju Chen and Chao Yang | Testing Ghasemi-Nodehi-Bambi metric parameters with quasi-periodic
oscillations | Published | Eur.Phys.J.C 80 (2020) 6, 504 | 10.1140/epjc/s10052-020-7915-9 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | QPOs are seen as peak features in the X-ray power spectral density of stellar
mass black holes and neutron stars, of which frequencies can be measured with
high precision. These QPO frequencies are believed to be related to fundamental
frequencies of test particles, which are mainly determined by the background
metri... | [
{
"created": "Wed, 24 Jun 2020 11:19:21 GMT",
"version": "v1"
}
] | 2020-07-15 | [
[
"Ghasemi-Nodehi",
"M.",
""
],
[
"Lu",
"Youjun",
""
],
[
"Chen",
"Ju",
""
],
[
"Yang",
"Chao",
""
]
] | QPOs are seen as peak features in the X-ray power spectral density of stellar mass black holes and neutron stars, of which frequencies can be measured with high precision. These QPO frequencies are believed to be related to fundamental frequencies of test particles, which are mainly determined by the background metric.... |
gr-qc/0504001 | Iver. H. Brevik | I. Brevik and O. Gorbunova | Dark Energy and Viscous Cosmology | 11 pages. Printing error in eq.(23) corrected. To appear in Gen. Rel.
Grav | Gen.Rel.Grav.37:2039-2045,2005 | 10.1007/s10714-005-0178-9 | null | gr-qc | null | Singularities in the dark energy universe are discussed, assuming that there
is a bulk viscosity in the cosmic fluid. In particular, it is shown how the
physically natural assumption of letting the bulk viscosity be proportional to
the scalar expansion in a spatially flat FRW universe can drive the fluid into
the pha... | [
{
"created": "Fri, 1 Apr 2005 08:00:20 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2005 09:39:44 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Brevik",
"I.",
""
],
[
"Gorbunova",
"O.",
""
]
] | Singularities in the dark energy universe are discussed, assuming that there is a bulk viscosity in the cosmic fluid. In particular, it is shown how the physically natural assumption of letting the bulk viscosity be proportional to the scalar expansion in a spatially flat FRW universe can drive the fluid into the phant... |
1408.6577 | Fay\c{c}al Hammad | Fay\c{c}al Hammad | Modified gravity from an entropy functional | 25 pages. Matches the published version | Int. J. Mod. Phys. D 23, No. 9 (2014) 1450073 | 10.1142/S0218271814500734 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend Padmanabhan's entropy functional formalism to show that, in
addition to the Gauss-Bonnet or the entire series of Lanczos-Lovelock
Lagrangians already obtained, more general higher-order corrections to General
Relativity, i.e., the so-called modified gravity theories, also emerge
naturally from this formalis... | [
{
"created": "Wed, 27 Aug 2014 21:58:05 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Aug 2015 23:01:03 GMT",
"version": "v2"
}
] | 2015-08-17 | [
[
"Hammad",
"Fayçal",
""
]
] | We extend Padmanabhan's entropy functional formalism to show that, in addition to the Gauss-Bonnet or the entire series of Lanczos-Lovelock Lagrangians already obtained, more general higher-order corrections to General Relativity, i.e., the so-called modified gravity theories, also emerge naturally from this formalism.... |
1909.04820 | Anton Galajinsky | Anton Galajinsky | Comment on "Generalized near horizon extreme binary black hole geometry" | V2: 4 pages. A typo fixed in the abstract and text, one ref. updated.
The version to appear in PRD | Phys. Rev. D 100, 128501 (2019) | 10.1103/PhysRevD.100.128501 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is demonstrated that the near-horizon geometry of two extreme Kerr black
holes of equal mass, which are held a finite distance apart by a massless
strut, introduced recently in [Phys. Rev. D 100 (2019) 044033], is a particular
member of the near horizon Kerr-Bolt class.
| [
{
"created": "Tue, 10 Sep 2019 08:05:50 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Nov 2019 02:17:41 GMT",
"version": "v2"
}
] | 2019-12-11 | [
[
"Galajinsky",
"Anton",
""
]
] | It is demonstrated that the near-horizon geometry of two extreme Kerr black holes of equal mass, which are held a finite distance apart by a massless strut, introduced recently in [Phys. Rev. D 100 (2019) 044033], is a particular member of the near horizon Kerr-Bolt class. |
gr-qc/0308062 | Julien Sylvestre | Julien Sylvestre | Optimal generalization of power filters for gravitational wave bursts,
from single to multiple detectors | 16 pages, 5 figures | Phys.Rev. D68 (2003) 102005 | 10.1103/PhysRevD.68.102005 | null | gr-qc | null | Searches for gravitational wave signals which do not have a precise model
describing the shape of their waveforms are often performed using power
detectors based on a quadratic form of the data. A new, optimal method of
generalizing these power detectors so that they operate coherently over a
network of interferomete... | [
{
"created": "Tue, 19 Aug 2003 16:23:17 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Sylvestre",
"Julien",
""
]
] | Searches for gravitational wave signals which do not have a precise model describing the shape of their waveforms are often performed using power detectors based on a quadratic form of the data. A new, optimal method of generalizing these power detectors so that they operate coherently over a network of interferometers... |
1909.04709 | Pierre-Henri Chavanis | Pierre-Henri Chavanis | Mass-radius relation of self-gravitating Bose-Einstein condensates with
a central black hole | null | Eur. Phys. J. Plus, 134, 352 (2019) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We determine the mass-radius relation of self-gravitating Bose-Einstein
condensates with an attractive $-1/r$ external potential created by a central
mass. Following our previous work [P.H. Chavanis, Phys. Rev. D 84, 043531
(2011)], we use an analytical approach based on a Gaussian ansatz. We consider
the case of non... | [
{
"created": "Tue, 10 Sep 2019 19:17:53 GMT",
"version": "v1"
}
] | 2019-09-12 | [
[
"Chavanis",
"Pierre-Henri",
""
]
] | We determine the mass-radius relation of self-gravitating Bose-Einstein condensates with an attractive $-1/r$ external potential created by a central mass. Following our previous work [P.H. Chavanis, Phys. Rev. D 84, 043531 (2011)], we use an analytical approach based on a Gaussian ansatz. We consider the case of nonin... |
gr-qc/9812055 | B. Linet | B. Linet | Characteristic hypersurfaces in a relativistic superfluid theory | 7 pages, latex, no figures | Lett.Math.Phys. 48 (1999) 235-241 | null | null | gr-qc | null | By discussing the Cauchy problem, we determine the covariant equation of the
characteristic hypersurfaces in a relativistic superfluid theory.
| [
{
"created": "Wed, 16 Dec 1998 12:27:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Linet",
"B.",
""
]
] | By discussing the Cauchy problem, we determine the covariant equation of the characteristic hypersurfaces in a relativistic superfluid theory. |
0801.4868 | Richard Kerner | Richard Kerner and Salvatore Vitale | Approximate solutions in General Relativity via deformation of
embeddings | null | null | null | null | gr-qc | null | A systematic study of deformations of four-dimensional Einsteinian
space-times embedded in a pseudo-Euclidean space $E^N$ of higher dimension is
presented. Infinitesimal deformations, seen as vector fields in $E^N$, can be
divided in two parts, tangent to the embedded hypersurface and orthogonal to
it; only the secon... | [
{
"created": "Thu, 31 Jan 2008 13:48:21 GMT",
"version": "v1"
}
] | 2008-02-01 | [
[
"Kerner",
"Richard",
""
],
[
"Vitale",
"Salvatore",
""
]
] | A systematic study of deformations of four-dimensional Einsteinian space-times embedded in a pseudo-Euclidean space $E^N$ of higher dimension is presented. Infinitesimal deformations, seen as vector fields in $E^N$, can be divided in two parts, tangent to the embedded hypersurface and orthogonal to it; only the second ... |
2004.09480 | Shuxuan Ying | Shuxuan Ying | Thermodynamics and Weak Cosmic Censorship Conjecture of 4D
Gauss-Bonnet-Maxwell Black Holes via Charged Particle Absorption | V3:19 pages, references added, typos corrected, version to appear in
Chinese Physics C | null | 10.1088/1674-1137/abb4c9 | CTP-SCU/2020010 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the non-trivial solutions for 4-dimensional black holes of
Einstein-Gauss-Bonnet gravity had been discovered. In this paper, considering a
charged particle entering into a 4-dimensional Gauss-Bonnet-Maxwell black hole,
we calculate the black hole thermodynamic properties by using the
Hamilton-Jacobi equatio... | [
{
"created": "Mon, 20 Apr 2020 17:55:30 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Apr 2020 16:48:05 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Jul 2020 12:21:07 GMT",
"version": "v3"
}
] | 2020-12-30 | [
[
"Ying",
"Shuxuan",
""
]
] | Recently, the non-trivial solutions for 4-dimensional black holes of Einstein-Gauss-Bonnet gravity had been discovered. In this paper, considering a charged particle entering into a 4-dimensional Gauss-Bonnet-Maxwell black hole, we calculate the black hole thermodynamic properties by using the Hamilton-Jacobi equation.... |
gr-qc/9607008 | Gerard Clement | G\'erard Cl\'ement | Flat wormholes from straight cosmic strings | 5 pages, latex, no figures | Helv.Phys.Acta 69:265-268,1996 | null | GCR-96/07/03 | gr-qc hep-th | null | Special multi-cosmic string metrics are analytically extended to describe
configurations of Wheeler-Misner wormholes and ordinary cosmic strings. I
investigate in detail the case of flat, asymptotically Minkowskian,
Wheeler-Misner wormhole spacetimes generated by two cosmic strings, each with
tension $-1/4G$.
| [
{
"created": "Thu, 4 Jul 1996 13:48:29 GMT",
"version": "v1"
}
] | 2011-04-20 | [
[
"Clément",
"Gérard",
""
]
] | Special multi-cosmic string metrics are analytically extended to describe configurations of Wheeler-Misner wormholes and ordinary cosmic strings. I investigate in detail the case of flat, asymptotically Minkowskian, Wheeler-Misner wormhole spacetimes generated by two cosmic strings, each with tension $-1/4G$. |
1708.09057 | El\'ias Castellanos Dr. | El\'ias Castellanos, Juan Carlos Degollado, Claus L\"ammerzahl,
Alfredo Mac\'ias and Volker Perlick | Bose-Einstein Condensates in Charged Black-Hole Spacetimes | 19 pages, 8 figures | Journal of Cosmology and Astroparticle Physics, 01 (2018) 043 | 10.1088/1475-7516/2018/01/043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze Bose-Einstein condensates on three types of spherically symmetric
and static charged black-hole spacetimes: The Reissner-Nordstr\"om spacetime,
Hoffmann's Born-Infeld black-hole spacetime, and the regular
Ay\'on-Beato-Garc\'ia spacetime. The Bose-Einstein condensate is modeled in
terms of a massive scalar ... | [
{
"created": "Tue, 29 Aug 2017 23:23:52 GMT",
"version": "v1"
}
] | 2018-02-26 | [
[
"Castellanos",
"Elías",
""
],
[
"Degollado",
"Juan Carlos",
""
],
[
"Lämmerzahl",
"Claus",
""
],
[
"Macías",
"Alfredo",
""
],
[
"Perlick",
"Volker",
""
]
] | We analyze Bose-Einstein condensates on three types of spherically symmetric and static charged black-hole spacetimes: The Reissner-Nordstr\"om spacetime, Hoffmann's Born-Infeld black-hole spacetime, and the regular Ay\'on-Beato-Garc\'ia spacetime. The Bose-Einstein condensate is modeled in terms of a massive scalar fi... |
1210.1565 | Scott Field | Alex G. Benedict, Scott E. Field, Stephen R. Lau | Fast evaluation of asymptotic waveforms from gravitational perturbations | 41 pages, 12 figures, 5 tables, uses revtex4.1 | null | 10.1088/0264-9381/30/5/055015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of blackhole perturbation theory, we describe both exact
evaluation of an asymptotic waveform from a time series recorded at a finite
radial location and its numerical approximation. From the user's standpoint our
technique is easy to implement, affords high accuracy, and works for both axial
(Regge-Wh... | [
{
"created": "Thu, 4 Oct 2012 19:58:29 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Benedict",
"Alex G.",
""
],
[
"Field",
"Scott E.",
""
],
[
"Lau",
"Stephen R.",
""
]
] | In the context of blackhole perturbation theory, we describe both exact evaluation of an asymptotic waveform from a time series recorded at a finite radial location and its numerical approximation. From the user's standpoint our technique is easy to implement, affords high accuracy, and works for both axial (Regge-Whee... |
1910.04068 | Oleg Zaslavskii | O. B. Zaslavskii | Schwarzschild black hole as accelerator of accelerated particles | 9 pages. Presentation expanded. To appear in JETP Letters | JETP Letters 111 (2020), 260 | 10.1134/S0021364020050033 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider collision of two particles near the horizon of a nonextremal
static black hole. At least one of them is accelerated. We show that the energy
$E_{c.m.}$ in the center of mass can become unbounded in spite of the fact that
a black hole is neither rotating nor electrically charged. In particular, this
happen... | [
{
"created": "Wed, 9 Oct 2019 15:29:04 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jan 2020 21:04:14 GMT",
"version": "v2"
}
] | 2020-04-29 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We consider collision of two particles near the horizon of a nonextremal static black hole. At least one of them is accelerated. We show that the energy $E_{c.m.}$ in the center of mass can become unbounded in spite of the fact that a black hole is neither rotating nor electrically charged. In particular, this happens ... |
gr-qc/9901065 | Shinsuke Kawai | Shinsuke Kawai, Masa-aki Sakagami and Jiro Soda | Perturbative analysis of non-singular cosmological model | Talk at YITP, Kyoto, in the Seventh Workshop on General Relativity
and Gravitation (Oct., 1997) | Proceedings of the Seventh Workshop on General Relativity and
Gravitation (Y. Eriguchi et.al., ed.) pp.249 | null | null | gr-qc | null | A stability analysis is made for a non-singular pre-big-bang like
cosmological model based on 1-loop corrected string effective action. Its
homogeneous and isotropic solution realizes non-singular transition from de
Sitter universe to Friedmann-like universe, via super inflation phase. We are
interested in whether th... | [
{
"created": "Sat, 23 Jan 1999 16:35:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kawai",
"Shinsuke",
""
],
[
"Sakagami",
"Masa-aki",
""
],
[
"Soda",
"Jiro",
""
]
] | A stability analysis is made for a non-singular pre-big-bang like cosmological model based on 1-loop corrected string effective action. Its homogeneous and isotropic solution realizes non-singular transition from de Sitter universe to Friedmann-like universe, via super inflation phase. We are interested in whether the ... |
0710.2610 | Lorenzo Iorio | Lorenzo Iorio | Solar System motions and the cosmological constant: a new approach | LaTex, 12 pages, no figures, 2 tables. One reference and one WEBlink
updated. To appear in Advances in Astronomy | Advances in Astronomy, vol. 2008, Article ID 268647 | 10.1155/2008/268647 | null | gr-qc astro-ph hep-ph physics.space-ph | null | We use the corrections to the Newton-Einstein secular precessions of the
longitudes of perihelia of some planets (Mercury, Earth, Mars, Jupiter, Saturn)
of the Solar System, phenomenologically estimated as solve-for parameters by
the Russian astronomer E.V. Pitjeva in a global fit of almost one century of
data with t... | [
{
"created": "Sat, 13 Oct 2007 14:42:24 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Feb 2008 18:05:11 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Mar 2008 20:29:21 GMT",
"version": "v3"
}
] | 2008-03-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | We use the corrections to the Newton-Einstein secular precessions of the longitudes of perihelia of some planets (Mercury, Earth, Mars, Jupiter, Saturn) of the Solar System, phenomenologically estimated as solve-for parameters by the Russian astronomer E.V. Pitjeva in a global fit of almost one century of data with the... |
2201.05180 | Pravin Dahal | Pravin Kumar Dahal | Alternative characterization of a black hole boundary | 8 pages, 0 figures; Accepted for publication in International Journal
of Modern Physics D | International Journal of Modern Physics D Vol. 31, No. 5 (2022)
2250031 | 10.1142/S0218271822500316 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | After reviewing the shortcomings of existing definitions used to characterize
the boundary of a black hole, we present a new method for its characterization.
This definition could potentially be applied to locate the boundary of general
black hole solutions of the Einstein field equations. Using our definition in
gen... | [
{
"created": "Fri, 7 Jan 2022 22:37:43 GMT",
"version": "v1"
}
] | 2022-04-20 | [
[
"Dahal",
"Pravin Kumar",
""
]
] | After reviewing the shortcomings of existing definitions used to characterize the boundary of a black hole, we present a new method for its characterization. This definition could potentially be applied to locate the boundary of general black hole solutions of the Einstein field equations. Using our definition in gener... |
2106.15027 | David Maxwell | James Isenberg and David Maxwell | A Phase Space Approach to the Conformal Construction of Non-Vacuum
Initial Data Sets in General Relativity | 48 pages | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a uniform (and unambiguous) procedure for scaling the matter
fields in implementing the conformal method to parameterize and construct
solutions of Einstein constraint equations with coupled matter sources. The
approach is based on a phase space representation of the space-time matter
fields after a carefu... | [
{
"created": "Mon, 28 Jun 2021 23:32:05 GMT",
"version": "v1"
}
] | 2021-06-30 | [
[
"Isenberg",
"James",
""
],
[
"Maxwell",
"David",
""
]
] | We present a uniform (and unambiguous) procedure for scaling the matter fields in implementing the conformal method to parameterize and construct solutions of Einstein constraint equations with coupled matter sources. The approach is based on a phase space representation of the space-time matter fields after a careful ... |
gr-qc/0003081 | null | Stanislav Tereshchenko | Electrodynamics of accelerated charges or Why electron does not radiate
in Rutherford's atom | LaTeX, 8 pages | null | null | null | gr-qc | null | It is shown, that the radiation of the charge, moving with uniform
acceleration or uniformly moving round a circle and also freely moving in a
gravitational field, contradicts the principle of equivalence. It is also
shown, that the interaction of the charges, moving with uniform acceleration or
uniformly circling, w... | [
{
"created": "Mon, 20 Mar 2000 12:56:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tereshchenko",
"Stanislav",
""
]
] | It is shown, that the radiation of the charge, moving with uniform acceleration or uniformly moving round a circle and also freely moving in a gravitational field, contradicts the principle of equivalence. It is also shown, that the interaction of the charges, moving with uniform acceleration or uniformly circling, whi... |
2212.08069 | Gaurav Gadbail | Gaurav N. Gadbail, Sanjay Mandal, and P. K. Sahoo | Paramerization of deceleration parameter in $f(Q)$ gravity | Published version @ Physics Journal (MDPI) | Physics 2022, 4(4), 1403-1412; | 10.3390/physics4040090 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this article, we investigate the modified symmetric teleparallel gravity
or $f(Q)$ gravity, where $Q$ is the non-metricity, to study the evolutionary
history of the universe by considering the functional form of $f(Q)=\alpha
Q^n$, where $\alpha$ and $n$ are constants. Here, we consider the
parametrization form of ... | [
{
"created": "Tue, 13 Dec 2022 14:04:50 GMT",
"version": "v1"
}
] | 2022-12-16 | [
[
"Gadbail",
"Gaurav N.",
""
],
[
"Mandal",
"Sanjay",
""
],
[
"Sahoo",
"P. K.",
""
]
] | In this article, we investigate the modified symmetric teleparallel gravity or $f(Q)$ gravity, where $Q$ is the non-metricity, to study the evolutionary history of the universe by considering the functional form of $f(Q)=\alpha Q^n$, where $\alpha$ and $n$ are constants. Here, we consider the parametrization form of th... |
2008.06560 | Marcelo Byrro Ribeiro | Osvaldo L. Santos-Pereira (1), Everton M. C. Abreu (2,3,4), Marcelo B.
Ribeiro (1,4,5) ((1) Physics Institute, Universidade Federal do Rio de
Janeiro, (2) Physics Department, Universidade Federal Rural do Rio de
Janeiro, (3) Physics Department, Universidade Federal de Juiz de Fora, (4)
Applied Physics Graduate ... | Dust content solutions for the Alcubierre warp drive spacetime | 15 pages, 1 figure. LaTeX. Accepted for publication in the European
Physical Journal C | Eur. Phys. J. C 80 (2020) 786 | 10.1140/epjc/s10052-020-8355-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Alcubierre metric is a spacetime geometry where a massive particle inside
a spacetime distortion, called warp bubble, is able to travel at velocities
arbitrarily higher than the velocity of light, a feature known as the warp
drive. This is a consequence of general relativity, which allows global
superluminal velo... | [
{
"created": "Fri, 14 Aug 2020 19:54:48 GMT",
"version": "v1"
}
] | 2020-09-01 | [
[
"Santos-Pereira",
"Osvaldo L.",
""
],
[
"Abreu",
"Everton M. C.",
""
],
[
"Ribeiro",
"Marcelo B.",
""
]
] | The Alcubierre metric is a spacetime geometry where a massive particle inside a spacetime distortion, called warp bubble, is able to travel at velocities arbitrarily higher than the velocity of light, a feature known as the warp drive. This is a consequence of general relativity, which allows global superluminal veloci... |
gr-qc/9904045 | Robert Bartnik | Robert A. Bartnik and Andrew H. Norton | Einstein equations in the null quasi-spherical gauge III: numerical
algorithms | Latex, 38 pages, 29 figures (360Kb compressed) | SIAM J. Scientific Computing 22(3), 917-950 (2000) | 10.1137/S1064827599356171 | ISE RR 99/110 | gr-qc | null | We describe numerical techniques used in the construction of our 4th order
evolution for the full Einstein equations, and assess the accuracy of
representative solutions. The code is based on a null gauge with a
quasi-spherical radial coordinate, and simulates the interaction of a single
black hole with gravitational... | [
{
"created": "Mon, 19 Apr 1999 10:48:30 GMT",
"version": "v1"
}
] | 2012-08-28 | [
[
"Bartnik",
"Robert A.",
""
],
[
"Norton",
"Andrew H.",
""
]
] | We describe numerical techniques used in the construction of our 4th order evolution for the full Einstein equations, and assess the accuracy of representative solutions. The code is based on a null gauge with a quasi-spherical radial coordinate, and simulates the interaction of a single black hole with gravitational r... |
gr-qc/0603061 | C. R. Keeton | Charles R. Keeton (Rutgers), A. O. Petters (Duke) | Formalism for testing theories of gravity using lensing by compact
objects. III: Braneworld gravity | 13 pages, 3 figures; accepted in PRD; expanded discussion of
prospects for observing attolensing with GLAST | Phys.Rev. D73 (2006) 104032 | 10.1103/PhysRevD.73.104032 | null | gr-qc astro-ph hep-ph | null | Braneworld gravity is a model that endows physical space with an extra
dimension. In the type II Randall-Sundrum braneworld gravity model, the extra
dimension modifies the spacetime geometry around black holes, and changes
predictions for the formation and survival of primordial black holes. We
develop a comprehensiv... | [
{
"created": "Wed, 15 Mar 2006 18:12:56 GMT",
"version": "v1"
},
{
"created": "Wed, 10 May 2006 18:53:00 GMT",
"version": "v2"
},
{
"created": "Thu, 25 May 2006 20:53:05 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Keeton",
"Charles R.",
"",
"Rutgers"
],
[
"Petters",
"A. O.",
"",
"Duke"
]
] | Braneworld gravity is a model that endows physical space with an extra dimension. In the type II Randall-Sundrum braneworld gravity model, the extra dimension modifies the spacetime geometry around black holes, and changes predictions for the formation and survival of primordial black holes. We develop a comprehensive ... |
gr-qc/9603016 | Valeri V. Ianovski | Peter Vorob'ev (BINP), Valeri Ianovski and Igor Okunev (PNPI) | Influence of geomagnetic perturbation on resonant gravitational wave
detector | 10 pages, LaTeX, no figures | Nucl.Instrum.Meth. A385 (1997) 471-474 | 10.1016/S0168-9002(96)01080-7 | null | gr-qc | null | The level of background signals in modern cryogenic resonant mass
gravitational wave antenna is discussed caused by (a) the geomagnetic field
pulsations and (b) an atmosferic of very low frequency band, generated by a
lightning flash. The analysis of our results show that the signals of this
origin will generally exc... | [
{
"created": "Mon, 12 Feb 1996 07:23:22 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Vorob'ev",
"Peter",
"",
"BINP"
],
[
"Ianovski",
"Valeri",
"",
"PNPI"
],
[
"Okunev",
"Igor",
"",
"PNPI"
]
] | The level of background signals in modern cryogenic resonant mass gravitational wave antenna is discussed caused by (a) the geomagnetic field pulsations and (b) an atmosferic of very low frequency band, generated by a lightning flash. The analysis of our results show that the signals of this origin will generally excee... |
1610.02235 | Donato Bini | Donato Bini, Gabriel Carvalho, Andrea Geralico | Scalar field self-force effects on a particle orbiting a
Reissner-Nordstrom black hole | 16 pages, 3 eps figures, revtex macros | Phys. Rev. D 94, 124028 (2016) | 10.1103/PhysRevD.94.124028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar field self-force effects on a scalar charge orbiting a
Reissner-Nordstr\"om black hole are investigated. The scalar wave equation is
solved analytically in a post-Newtonian framework, and the solution is used to
compute the self-field as well as the components of the self-force at the
particle's location up to... | [
{
"created": "Fri, 7 Oct 2016 11:57:34 GMT",
"version": "v1"
}
] | 2016-12-28 | [
[
"Bini",
"Donato",
""
],
[
"Carvalho",
"Gabriel",
""
],
[
"Geralico",
"Andrea",
""
]
] | Scalar field self-force effects on a scalar charge orbiting a Reissner-Nordstr\"om black hole are investigated. The scalar wave equation is solved analytically in a post-Newtonian framework, and the solution is used to compute the self-field as well as the components of the self-force at the particle's location up to 7... |
1710.02402 | Marius Adrian Oancea | Marc Mars, Claudio F. Paganini, Marius A. Oancea | The Fingerprints of Black Holes - Shadows and their Degeneracies | 23 pages, 0 figures | null | 10.1088/1361-6382/aa97ff | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, away from the axis of symmetry, no continuous degeneration
exists between the shadows of observers at any point in the exterior region of
any Kerr-Newman black hole spacetime of unit mass. Therefore, except possibly
for discrete changes, an observer can, by measuring the black holes shadow,
determine th... | [
{
"created": "Fri, 6 Oct 2017 13:30:59 GMT",
"version": "v1"
}
] | 2017-12-27 | [
[
"Mars",
"Marc",
""
],
[
"Paganini",
"Claudio F.",
""
],
[
"Oancea",
"Marius A.",
""
]
] | We show that, away from the axis of symmetry, no continuous degeneration exists between the shadows of observers at any point in the exterior region of any Kerr-Newman black hole spacetime of unit mass. Therefore, except possibly for discrete changes, an observer can, by measuring the black holes shadow, determine the ... |
gr-qc/9804082 | George Bogoslovsky | G.Yu. Bogoslovsky, H.F. Goenner | On a Possibility of Phase Transitions in the Geometric Structure of
Space-Time | 13 pages, 2 figures, 1 table; to appear in Physics Letters A | Phys.Lett. A244 (1998) 222-228 | 10.1016/S0375-9601(98)00293-X | NPI MSU-97-29/480 | gr-qc astro-ph | null | It is shown that space-time may be not only in a state which is described by
Riemann geometry but also in states which are described by Finsler geometry.
Transitions between various metric states of space-time have the meaning of
phase transitions in its geometric structure. These transitions together with
the evolut... | [
{
"created": "Wed, 29 Apr 1998 17:47:16 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bogoslovsky",
"G. Yu.",
""
],
[
"Goenner",
"H. F.",
""
]
] | It is shown that space-time may be not only in a state which is described by Riemann geometry but also in states which are described by Finsler geometry. Transitions between various metric states of space-time have the meaning of phase transitions in its geometric structure. These transitions together with the evolutio... |
2309.05725 | Naritaka Oshita | Naritaka Oshita | Greybody Factors Imprinted on Black Hole Ringdowns: an alternative to
superposed quasi-normal modes | 13 pages, 11 figures | null | null | YITP-23-111, RIKEN-iTHEMS-Report-23 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | It is shown that the spectral amplitude of gravitational-wave (GW) ringdown
of a Kerr black hole sourced by an extreme mass ratio merger can be modeled by
the $\textit{greybody factor}$, which quantifies the scattering nature of the
black hole geometry. The estimation of the mass and spin of the remnant is
demonstrat... | [
{
"created": "Mon, 11 Sep 2023 18:00:43 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Oct 2023 20:20:08 GMT",
"version": "v2"
}
] | 2023-10-04 | [
[
"Oshita",
"Naritaka",
""
]
] | It is shown that the spectral amplitude of gravitational-wave (GW) ringdown of a Kerr black hole sourced by an extreme mass ratio merger can be modeled by the $\textit{greybody factor}$, which quantifies the scattering nature of the black hole geometry. The estimation of the mass and spin of the remnant is demonstrated... |
1810.06582 | James Edholm | James Edholm, Jonathan Pearson | Cosmological perturbations in generalised dark Lagrangians | 16 pages | null | 10.1007/JHEP11(2018)180 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a new method to parameterise dark energy theories including
massive gravity, elastic dark energy and tensor-metric theories. We first
examine a framework to describe any second order Lagrangian which depends on
the variation of the metric and find new constraints on the parameters. We
extend the method to... | [
{
"created": "Mon, 15 Oct 2018 18:00:25 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Nov 2018 16:03:09 GMT",
"version": "v2"
},
{
"created": "Tue, 20 Nov 2018 14:48:29 GMT",
"version": "v3"
}
] | 2018-12-26 | [
[
"Edholm",
"James",
""
],
[
"Pearson",
"Jonathan",
""
]
] | We describe a new method to parameterise dark energy theories including massive gravity, elastic dark energy and tensor-metric theories. We first examine a framework to describe any second order Lagrangian which depends on the variation of the metric and find new constraints on the parameters. We extend the method to L... |
1712.08625 | Alexander Silenko | Alexander J. Silenko | Relativistic quantum mechanics of a Proca particle in Riemannian
spacetimes | 26 pages, final version | Phys. Rev. D 98, 025014 (2018) | 10.1103/PhysRevD.98.025014 | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relativistic quantum mechanics of a Proca (spin-1) particle in Riemannian
spacetimes is constructed. Covariant equations defining electromagnetic
interactions of a Proca particle with the anomalous magnetic moment and the
electric dipole moment in Riemannian spacetimes are formulated. The
relativistic Foldy-Wouthuyse... | [
{
"created": "Fri, 22 Dec 2017 19:10:20 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Feb 2018 06:55:22 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Apr 2018 16:39:14 GMT",
"version": "v3"
},
{
"created": "Fri, 13 Jul 2018 11:13:58 GMT",
"version": "v4"
}
] | 2018-07-25 | [
[
"Silenko",
"Alexander J.",
""
]
] | Relativistic quantum mechanics of a Proca (spin-1) particle in Riemannian spacetimes is constructed. Covariant equations defining electromagnetic interactions of a Proca particle with the anomalous magnetic moment and the electric dipole moment in Riemannian spacetimes are formulated. The relativistic Foldy-Wouthuysen ... |
gr-qc/0210038 | Antonio Feoli | A.Feoli | Maximal acceleration or maximal accelerations? | 13 pages, Latex, to be published in Int. J. Mod. Phys. D | Int.J.Mod.Phys.D12:271-280,2003 | 10.1142/S0218271803002706 | null | gr-qc | null | We review the arguments supporting the existence of a maximal acceleration
for a massive particle and show that different values of this upper limit can
be predicted in different physical situations.
| [
{
"created": "Sat, 12 Oct 2002 10:53:19 GMT",
"version": "v1"
}
] | 2011-09-01 | [
[
"Feoli",
"A.",
""
]
] | We review the arguments supporting the existence of a maximal acceleration for a massive particle and show that different values of this upper limit can be predicted in different physical situations. |
2103.10223 | Nils Andersson | N. Andersson | A gravitational-wave perspective on neutron-star seismology | 20 pages, 2 figures, submitted for special issue in Universe | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a bird's-eye view of neutron-star seismology, which aims to probe
the extreme physics associated with these objects, in the context of
gravitational-wave astronomy. Focussing on the fundamental mode of oscillation,
which is an efficient gravitational-wave emitter, we consider the seismology
aspects of a nu... | [
{
"created": "Thu, 18 Mar 2021 12:49:33 GMT",
"version": "v1"
}
] | 2021-03-19 | [
[
"Andersson",
"N.",
""
]
] | We provide a bird's-eye view of neutron-star seismology, which aims to probe the extreme physics associated with these objects, in the context of gravitational-wave astronomy. Focussing on the fundamental mode of oscillation, which is an efficient gravitational-wave emitter, we consider the seismology aspects of a numb... |
gr-qc/0603023 | Amit Ghosh | Ayan Chatterjee and Amit Ghosh | Generic weak isolated horizons | 4 pages, 1 figure | Class.Quant.Grav. 23 (2006) 7521-7530 | 10.1088/0264-9381/23/24/021 | SINP/TNP/06-06 | gr-qc hep-th | null | Weak isolated horizon boundary conditions have been relaxed supposedly to
their weakest form such that both zeroth and the first law of black hole
mechanics still emerge, thus making the formulation more amenable for
applications in both analytic and numerical Relativity. As an additional gain
it explicitly brings th... | [
{
"created": "Wed, 8 Mar 2006 14:39:04 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Chatterjee",
"Ayan",
""
],
[
"Ghosh",
"Amit",
""
]
] | Weak isolated horizon boundary conditions have been relaxed supposedly to their weakest form such that both zeroth and the first law of black hole mechanics still emerge, thus making the formulation more amenable for applications in both analytic and numerical Relativity. As an additional gain it explicitly brings the ... |
gr-qc/9803087 | Philippos Papadopoulos | Philippos Papadopoulos and Jose A. Font | Relativistic Hydrodynamics around Black Holes and Horizon Adapted
Coordinate Systems | 10 pages, 4 postscript figures, accepted for publication in Phys.
Rev. D | Phys.Rev. D58 (1998) 024005 | 10.1103/PhysRevD.58.024005 | null | gr-qc astro-ph | null | Despite the fact that the Schwarzschild and Kerr solutions for the Einstein
equations, when written in standard Schwarzschild and Boyer-Lindquist
coordinates, present coordinate singularities, all numerical studies of
accretion flows onto collapsed objects have been widely using them over the
years. This approach int... | [
{
"created": "Thu, 26 Mar 1998 19:09:19 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Papadopoulos",
"Philippos",
""
],
[
"Font",
"Jose A.",
""
]
] | Despite the fact that the Schwarzschild and Kerr solutions for the Einstein equations, when written in standard Schwarzschild and Boyer-Lindquist coordinates, present coordinate singularities, all numerical studies of accretion flows onto collapsed objects have been widely using them over the years. This approach intro... |
0806.2821 | Martin Bojowald | Martin Bojowald and Rupam Das | Fermions in Loop Quantum Cosmology and the Role of Parity | 17 pages | Class.Quant.Grav.25:195006,2008 | 10.1088/0264-9381/25/19/195006 | IGC-08/6-4 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fermions play a special role in homogeneous models of quantum cosmology
because the exclusion principle prevents them from forming sizable matter
contributions. They can thus describe the matter ingredients only truly
microscopically and it is not possible to avoid strong quantum regimes by
positing a large matter co... | [
{
"created": "Tue, 17 Jun 2008 15:36:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bojowald",
"Martin",
""
],
[
"Das",
"Rupam",
""
]
] | Fermions play a special role in homogeneous models of quantum cosmology because the exclusion principle prevents them from forming sizable matter contributions. They can thus describe the matter ingredients only truly microscopically and it is not possible to avoid strong quantum regimes by positing a large matter cont... |
gr-qc/9704066 | Merced Montesinos | Merced Montesinos-Velasquez, Hugo A. Morales-Tecotl and Tonatiuh Matos | Fermion mass gap in the loop representation of quantum gravity | 15 pages, Latex file, no figures. To be published in Classical and
Quantum Gravity | Class.Quant.Grav.14:L135-L142,1997 | 10.1088/0264-9381/14/7/002 | null | gr-qc hep-th | null | An essential step towards the identification of a fermion mass generation
mechanism at Planck scale is to analyse massive fermions in a given quantum
gravity framework. In this letter the two mass terms entering the Hamiltonian
constraint for the Einstein-Majorana system are studied in the loop
representation of quan... | [
{
"created": "Thu, 24 Apr 1997 00:19:22 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Montesinos-Velasquez",
"Merced",
""
],
[
"Morales-Tecotl",
"Hugo A.",
""
],
[
"Matos",
"Tonatiuh",
""
]
] | An essential step towards the identification of a fermion mass generation mechanism at Planck scale is to analyse massive fermions in a given quantum gravity framework. In this letter the two mass terms entering the Hamiltonian constraint for the Einstein-Majorana system are studied in the loop representation of quantu... |
1807.03467 | Koji Yamaguchi | Jose Trevison, Koji Yamaguchi, and Masahiro Hotta | Spatially Overlapped Partners in Quantum Field Theory | 35 pages, 6 figures. Published version | Journal of Physics A: Mathematical and Theoretical, Volume 52,
Number 12 (2019) | 10.1088/1751-8121/ab065b | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In quantum field theory particles are physically defined as what Unruh-DeWitt
particle detectors observe. By detecting a particle mode $A$, a reduced density
operator for a quantum state of $A$ is constructed. Even if the entire quantum
state of the quantum field is pure, the state of $A$ is not pure but mixed due
to... | [
{
"created": "Tue, 10 Jul 2018 03:35:02 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Sep 2018 06:51:46 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Oct 2018 01:15:30 GMT",
"version": "v3"
},
{
"created": "Wed, 19 Dec 2018 05:12:11 GMT",
"version": "v4"
},
{
"cr... | 2019-03-04 | [
[
"Trevison",
"Jose",
""
],
[
"Yamaguchi",
"Koji",
""
],
[
"Hotta",
"Masahiro",
""
]
] | In quantum field theory particles are physically defined as what Unruh-DeWitt particle detectors observe. By detecting a particle mode $A$, a reduced density operator for a quantum state of $A$ is constructed. Even if the entire quantum state of the quantum field is pure, the state of $A$ is not pure but mixed due to e... |
gr-qc/0212077 | Etera R. Livine | Laurent Freidel, Etera R. Livine, Carlo Rovelli | Spectra of Length and Area in 2+1 Lorentzian Loop Quantum Gravity | RevTex, 13 pages, v2: references added | Class.Quant.Grav.20:1463-1478,2003 | 10.1088/0264-9381/20/8/304 | null | gr-qc hep-th | null | We study the spectrum of the length and area operators in Lorentzian loop
quantum gravity, in 2+1 spacetime dimensions. We find that the spectrum of
spacelike intervals is continuous, whereas the spectrum of timelike intervals
is discrete. This result contradicts the expectation that spacelike intervals
are always di... | [
{
"created": "Wed, 18 Dec 2002 18:11:51 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jan 2003 10:17:37 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Freidel",
"Laurent",
""
],
[
"Livine",
"Etera R.",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We study the spectrum of the length and area operators in Lorentzian loop quantum gravity, in 2+1 spacetime dimensions. We find that the spectrum of spacelike intervals is continuous, whereas the spectrum of timelike intervals is discrete. This result contradicts the expectation that spacelike intervals are always disc... |
gr-qc/0303053 | Banibrata Mukhopadhyay | Banibrata Mukhopadhyay and Parampreet Singh | Neutrino-Antineutrino Asymmetry around Rotating Black Holes | 3 pages, pramana style; to appear in a special issue of Pramana -- J.
Phys., as proceedings of IXth Particle-String-Cosmology (PASCOS), January
3-8, 2003, TIFR, Mumbai, India | Pramana62:775-778,2004 | 10.1007/BF02705368 | null | gr-qc astro-ph | null | Propagation of fermion in curved space-time generates gravitational
interaction due to the coupling between spin of the fermion and space-time
curvature. This gravitational interaction, which is an axial-vector appears as
CPT violating term in the Lagrangian. It is seen that this space-time
interaction can generate n... | [
{
"created": "Wed, 12 Mar 2003 19:08:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mukhopadhyay",
"Banibrata",
""
],
[
"Singh",
"Parampreet",
""
]
] | Propagation of fermion in curved space-time generates gravitational interaction due to the coupling between spin of the fermion and space-time curvature. This gravitational interaction, which is an axial-vector appears as CPT violating term in the Lagrangian. It is seen that this space-time interaction can generate neu... |
2101.09008 | Chi-Yong Lin | Tien Hsieh, Da-Shin Lee and Chi-Yong Lin | Strong gravitational lensing by Kerr and Kerr-Newman black holes | 27 pages, 6 figures | Phys. Rev. D 103, 104063 (2021) | 10.1103/PhysRevD.103.104063 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the strong gravitational lensing due to the Kerr black holes with
angular momentum $a$ and the Kerr-Newman black holes with additional charge
$Q$. We first derive the analytical expressions of the deflection angles of
light rays that particularly diverge as they travel near the photon sphere. In
this strong ... | [
{
"created": "Fri, 22 Jan 2021 09:03:26 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jun 2021 06:47:50 GMT",
"version": "v2"
}
] | 2021-06-21 | [
[
"Hsieh",
"Tien",
""
],
[
"Lee",
"Da-Shin",
""
],
[
"Lin",
"Chi-Yong",
""
]
] | We study the strong gravitational lensing due to the Kerr black holes with angular momentum $a$ and the Kerr-Newman black holes with additional charge $Q$. We first derive the analytical expressions of the deflection angles of light rays that particularly diverge as they travel near the photon sphere. In this strong de... |
1410.7777 | Charalampos Markakis | Charalampos M. Markakis | Hamiltonian Hydrodynamics and Irrotational Binary Inspiral | null | null | null | null | gr-qc astro-ph.SR physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves from neutron-star and black-hole binaries carry valuable
information on their physical properties and probe physics inaccessible to the
laboratory. Although development of black-hole gravitational-wave templates in
the past decade has been revolutionary, the corresponding work for double
neutron-s... | [
{
"created": "Tue, 28 Oct 2014 20:00:05 GMT",
"version": "v1"
}
] | 2014-10-30 | [
[
"Markakis",
"Charalampos M.",
""
]
] | Gravitational waves from neutron-star and black-hole binaries carry valuable information on their physical properties and probe physics inaccessible to the laboratory. Although development of black-hole gravitational-wave templates in the past decade has been revolutionary, the corresponding work for double neutron-sta... |
gr-qc/9402035 | null | Alexander V. Evako | Dimension on Discrete Spaces | 16 pages, 8 figures, Latex. Figures are not included, available from
the author upon request. Preprint SU-GP-93/1-1. To appear in "International
Journal of Theoretical Physics" | Int.J.Theor.Phys. 33 (1994) 1553-1568 | 10.1007/BF00670697 | null | gr-qc astro-ph hep-lat hep-th | null | In this paper we develop some combinatorial models for continuous spaces. In
this spirit we study the approximations of continuous spaces by graphs,
molecular spaces and coordinate matrices. We define the dimension on a discrete
space by means of axioms, and the axioms are based on an obvious geometrical
background. ... | [
{
"created": "Sat, 19 Feb 1994 23:15:11 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Evako",
"Alexander V.",
""
]
] | In this paper we develop some combinatorial models for continuous spaces. In this spirit we study the approximations of continuous spaces by graphs, molecular spaces and coordinate matrices. We define the dimension on a discrete space by means of axioms, and the axioms are based on an obvious geometrical background. Th... |
gr-qc/9711089 | Ion Cotaescu | Ion I. Cotaescu (The West University of Timisoara, Timisoara, Romania) | The Dirac equation in Cartesian gauge | 8 pages, LaTeX article | null | null | null | gr-qc | null | It is shown that in the case of the spherically symmetric static backgrounds
there is a gauge in which the Dirac equation is manifestly covariant under
rotations. This allows us to separate the spherical variables like in the flat
space-time, obtaining a pair of radial equations and a specific form of the
radial scal... | [
{
"created": "Fri, 28 Nov 1997 15:21:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cotaescu",
"Ion I.",
"",
"The West University of Timisoara, Timisoara, Romania"
]
] | It is shown that in the case of the spherically symmetric static backgrounds there is a gauge in which the Dirac equation is manifestly covariant under rotations. This allows us to separate the spherical variables like in the flat space-time, obtaining a pair of radial equations and a specific form of the radial scalar... |
gr-qc/0409102 | James W. York Jr. | James W. York Jr | Velocities and Momenta in an Extended Elliptic Form of the Initial Value
Conditions | 10 pages, to appear in Analysis, Manifolds and Geometric Structures
in Physics (Elba, 2004), edited by G. Ferrarese & T. Ruggeri: Pitagora
Editrice (Bologna, 2004) | Nuovo Cim.B119:823-837,2004 | 10.1393/ncb/i2004-10181-y | null | gr-qc | null | The complete form of the constraints following from their conformal structure
is extended so as to include constant mean curvature and other mean curvature
foliations. This step is demonstrated using the momentum phase space approach.
This approach yields equations of exactly the same form as the extended
conformal t... | [
{
"created": "Tue, 28 Sep 2004 03:57:43 GMT",
"version": "v1"
}
] | 2011-04-21 | [
[
"York",
"James W.",
"Jr"
]
] | The complete form of the constraints following from their conformal structure is extended so as to include constant mean curvature and other mean curvature foliations. This step is demonstrated using the momentum phase space approach. This approach yields equations of exactly the same form as the extended conformal thi... |
gr-qc/0703107 | Kirill Bronnikov | K.A. Bronnikov and M.S. Chernakova | Charged black holes and unusual wormholes in scalar-tensor gravity | 5 pages, 3 figures, GC style | Grav.Cosmol.13:51-55,2007 | null | null | gr-qc | null | We consider static, spherically symmetric, electrically or/and magnetically
charged configurations of a minimally coupled scalar field with an arbitrary
potential $V(\phi)$ in general relativity. Using the inverse problem method, we
obtain a four-parameter family of asymptotically dS, flat and AdS solutions,
includin... | [
{
"created": "Wed, 21 Mar 2007 10:55:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Chernakova",
"M. S.",
""
]
] | We consider static, spherically symmetric, electrically or/and magnetically charged configurations of a minimally coupled scalar field with an arbitrary potential $V(\phi)$ in general relativity. Using the inverse problem method, we obtain a four-parameter family of asymptotically dS, flat and AdS solutions, including ... |
1706.07190 | Ian Vega | Karl Simon Revelar and Ian Vega | Overcharging higher-dimensional black holes with point particles | 7 pages, 3 figures | Phys. Rev. D 96, 064010 (2017) | 10.1103/PhysRevD.96.064010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility of overcharging spherically-symmetric black
holes in spacetime dimensions $D > 4$ by the capture of a charged particle. We
generalize Wald's classic result that extremal black holes cannot be
overcharged. For nearly extremal black holes, we also generalize Hubeny's
scenario by showing t... | [
{
"created": "Thu, 22 Jun 2017 07:33:20 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Revelar",
"Karl Simon",
""
],
[
"Vega",
"Ian",
""
]
] | We investigate the possibility of overcharging spherically-symmetric black holes in spacetime dimensions $D > 4$ by the capture of a charged particle. We generalize Wald's classic result that extremal black holes cannot be overcharged. For nearly extremal black holes, we also generalize Hubeny's scenario by showing tha... |
gr-qc/0501055 | Ettore Minguzzi | E. Minguzzi | Spacelike slices from globally well-behaved simultaneity connections | 7 pages, 3 figures. Contribution to the conference "Spanish
Relativity Meeting, Beyond General Relativity", Miraflores de la Sierra,
Madrid, September 23 - 25, 2004 | Beyond general relativity : proceedings of the 2004 Spanish
Relativity Meeting (ERE2004), Natxo Alonso-Alberca, [et al.], ed.,
Universidad Autonoma de Madrid, Coop. 2007, ISBN 9788483440599, p. 179--184 | null | null | gr-qc | null | As shown by the development of Special Relativity the simultaneity concept
should be related to that of reference frame. Poincare' proposed to define the
simultaneity of two events by means of light signals following what is nowadays
known as the Einstein simultaneity convention. The need of a simultaneity
definition... | [
{
"created": "Tue, 18 Jan 2005 12:25:16 GMT",
"version": "v1"
}
] | 2012-03-05 | [
[
"Minguzzi",
"E.",
""
]
] | As shown by the development of Special Relativity the simultaneity concept should be related to that of reference frame. Poincare' proposed to define the simultaneity of two events by means of light signals following what is nowadays known as the Einstein simultaneity convention. The need of a simultaneity definition i... |
1501.01587 | Alexandru Ionescu | Alexandru Ionescu and Sergiu Klainerman | Rigidity Results in General Relativity: a Review | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this survey we review the progress made in the last ten years in
understanding the Black Hole Rigidity problem in the setting of smooth
spacetimes. We review both local and global results and discuss the main
mathematical ideas behind them.
| [
{
"created": "Wed, 7 Jan 2015 18:49:06 GMT",
"version": "v1"
}
] | 2015-01-08 | [
[
"Ionescu",
"Alexandru",
""
],
[
"Klainerman",
"Sergiu",
""
]
] | In this survey we review the progress made in the last ten years in understanding the Black Hole Rigidity problem in the setting of smooth spacetimes. We review both local and global results and discuss the main mathematical ideas behind them. |
gr-qc/0205052 | Dirk Puetzfeld | Dirk Puetzfeld | A cosmological model in Weyl-Cartan spacetime: II. Magnitude-redshift
relation | 23 pages, 5 figures, IOP preprint style | Class.Quant.Grav.19:4463-4482,2002 | 10.1088/0264-9381/19/16/316 | null | gr-qc | null | In this second part of our series of articles on alternative cosmological
models we investigate the observational consequences for the new Weyl-Cartan
model proposed earlier. We review the derivation of the magnitude-redshift
relation within the standard FLRW model and characterize its dependence on the
underlying co... | [
{
"created": "Mon, 13 May 2002 17:24:28 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Dec 2002 12:14:42 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Puetzfeld",
"Dirk",
""
]
] | In this second part of our series of articles on alternative cosmological models we investigate the observational consequences for the new Weyl-Cartan model proposed earlier. We review the derivation of the magnitude-redshift relation within the standard FLRW model and characterize its dependence on the underlying cosm... |
1303.2555 | Eugene Stefanovich | B. T. Shields, M. C. Morris, M. R. Ware, Q. Su, E. V. Stefanovich, R.
Grobe | Time dilation in relativistic two-particle interactions | 14 pages, 1 figure | Phys. Rev. A 82 (2010), 052116 | 10.1103/PhysRevA.82.052116 | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the orbits of two interacting particles described by a fully
relativistic classical mechanical Hamiltonian. We use two sets of initial
conditions. In the first set (dynamics 1) the system's center of mass is at
rest. In the second set (dynamics 2) the center of mass evolves with velocity
V. If dynamics 1 is ... | [
{
"created": "Mon, 4 Mar 2013 00:40:59 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Shields",
"B. T.",
""
],
[
"Morris",
"M. C.",
""
],
[
"Ware",
"M. R.",
""
],
[
"Su",
"Q.",
""
],
[
"Stefanovich",
"E. V.",
""
],
[
"Grobe",
"R.",
""
]
] | We study the orbits of two interacting particles described by a fully relativistic classical mechanical Hamiltonian. We use two sets of initial conditions. In the first set (dynamics 1) the system's center of mass is at rest. In the second set (dynamics 2) the center of mass evolves with velocity V. If dynamics 1 is ob... |
1304.4683 | Shahar Hod | Shahar Hod | Black-hole perturbation theory: The asymptotic spectrum of the prolate
spin-weighted spheroidal harmonics | 5 pages | Physical Review D 87, 064017 (2013) | 10.1103/PhysRevD.87.064017 | null | gr-qc astro-ph.HE hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Prolate spin-weighted spheroidal harmonics play a key role in black-hole
perturbation theory. In particular, the highly damped quasinormal resonances of
rotating Kerr black holes are closely related to the asymptotic eigenvalues of
these important functions. We here present a novel and compact derivation of
the asymp... | [
{
"created": "Wed, 17 Apr 2013 04:27:02 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Hod",
"Shahar",
""
]
] | Prolate spin-weighted spheroidal harmonics play a key role in black-hole perturbation theory. In particular, the highly damped quasinormal resonances of rotating Kerr black holes are closely related to the asymptotic eigenvalues of these important functions. We here present a novel and compact derivation of the asympto... |
1208.5789 | Juan Luis P\'erez P\'erez | Juan L. Perez, Ruben Cordero and L. Arturo Urena-Lopez | Two-brane system in a vacuum bulk with a single equation of state | This work was presented at the IX Taller de la Division de
Gravitacion y Fisica Matematica, Colima 2011 | AIP Conf. Proc. 1473, 132 (2012) | 10.1063/1.4748545 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the cosmology of a two-brane model in a five-dimensional spacetime,
where the extra spatial coordinate is compactifed on an orbifold. Additionally,
we consider the existence on each brane of matter fields that evolve in time.
Solving the Einstein equations in a vacuum bulk, we can show how the matter
fields ... | [
{
"created": "Tue, 28 Aug 2012 20:49:34 GMT",
"version": "v1"
}
] | 2012-08-30 | [
[
"Perez",
"Juan L.",
""
],
[
"Cordero",
"Ruben",
""
],
[
"Urena-Lopez",
"L. Arturo",
""
]
] | We study the cosmology of a two-brane model in a five-dimensional spacetime, where the extra spatial coordinate is compactifed on an orbifold. Additionally, we consider the existence on each brane of matter fields that evolve in time. Solving the Einstein equations in a vacuum bulk, we can show how the matter fields in... |
2311.11650 | Milena Skvortsova | Milena Skvortsova | Quasinormal spectrum of $(2+1)$-dimensional asymptotically flat, dS and
AdS black holes | 19 pages, 6 figures, revtex | Fortschr. Phys. 2024, 2400036 | 10.1002/prop.202400036 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | While $(2+1)$-dimensional black holes in the Einstein theory allow for only
the anti-de Sitter asymptotic, when the higher curvature correction is tuned
on, the asymptotically flat, de Sitter and anti-de Sitter cases are included.
Here we propose first comprehensive study of the stability and quasinormal
spectra of t... | [
{
"created": "Mon, 20 Nov 2023 10:34:25 GMT",
"version": "v1"
}
] | 2024-04-25 | [
[
"Skvortsova",
"Milena",
""
]
] | While $(2+1)$-dimensional black holes in the Einstein theory allow for only the anti-de Sitter asymptotic, when the higher curvature correction is tuned on, the asymptotically flat, de Sitter and anti-de Sitter cases are included. Here we propose first comprehensive study of the stability and quasinormal spectra of the... |
0709.1812 | Petar Grujic Mr | V. Pankovic, M. Predojevic and P. Grujic | A Bohr's Semiclassical Model of the Black Hole Thermodynamics | no figures | null | 10.2298/SAJ0876015P | null | gr-qc | null | We propose a simple procedure for evaluating the main thermodynamical
attributes of a Schwarzschild's black hole: Bekenstein-Hawking entropy,
Hawking's temperature and Bekenstein's quantization of the surface area. We
make use of the condition that the circumference of a great circle on the black
hole horizon contain... | [
{
"created": "Wed, 12 Sep 2007 11:44:00 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Pankovic",
"V.",
""
],
[
"Predojevic",
"M.",
""
],
[
"Grujic",
"P.",
""
]
] | We propose a simple procedure for evaluating the main thermodynamical attributes of a Schwarzschild's black hole: Bekenstein-Hawking entropy, Hawking's temperature and Bekenstein's quantization of the surface area. We make use of the condition that the circumference of a great circle on the black hole horizon contains ... |
1301.5261 | Markus B. Fr\"ob | Markus B. Fr\"ob, Demetrios B. Papadopoulos, Albert Roura, Enric
Verdaguer | Nonperturbative semiclassical stability of de Sitter spacetime for small
metric deviations | 19 pages | Phys. Rev. D. 87, 064019 (2013) | 10.1103/PhysRevD.87.064019 | AEI-2011-067 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the linearized semiclassical Einstein equations for small
deviations around de Sitter spacetime including the vacuum polarization effects
of conformal fields. Employing the method of order reduction, we find the exact
solutions for general metric perturbations (of scalar, vector and tensor type).
Our exac... | [
{
"created": "Tue, 22 Jan 2013 18:05:56 GMT",
"version": "v1"
}
] | 2013-06-06 | [
[
"Fröb",
"Markus B.",
""
],
[
"Papadopoulos",
"Demetrios B.",
""
],
[
"Roura",
"Albert",
""
],
[
"Verdaguer",
"Enric",
""
]
] | We consider the linearized semiclassical Einstein equations for small deviations around de Sitter spacetime including the vacuum polarization effects of conformal fields. Employing the method of order reduction, we find the exact solutions for general metric perturbations (of scalar, vector and tensor type). Our exact ... |
1611.01289 | J. W. van Holten | J.W. van Holten | Dynamical Space-Time and Gravitational Waves | Contribution to Proceedings 8th Aegean Summerschool, Crete (GR),
2015; 21 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to General Relativity gravity is the result of the interaction
between matter and space-time geometry. In this interaction space-time geometry
itself is dynamical: it can store and transport energy and momentum in the form
of gravitational waves. We give an introductory account of this phenomenon and
discus... | [
{
"created": "Fri, 4 Nov 2016 09:01:01 GMT",
"version": "v1"
}
] | 2016-11-07 | [
[
"van Holten",
"J. W.",
""
]
] | According to General Relativity gravity is the result of the interaction between matter and space-time geometry. In this interaction space-time geometry itself is dynamical: it can store and transport energy and momentum in the form of gravitational waves. We give an introductory account of this phenomenon and discuss ... |
2104.00001 | Pardyumn Kumar Sahoo | Simran Arora, Abhishek Parida, P.K. Sahoo | Constraining effective equation of state in $f(Q,T)$ gravity | Revision submitted to EPJC | Eur. Phys. J. C, 81 (2021) 555 | 10.1140/epjc/s10052-021-09358-4 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | New high-precision observations are now possible to constrain different
gravity theories. To examine the accelerated expansion of the Universe, we used
the newly proposed $f(Q,T)$ gravity, where $Q$ is the non-metricity, and $T$ is
the trace of the energy-momentum tensor. The investigation is carried out using
a para... | [
{
"created": "Wed, 31 Mar 2021 04:23:15 GMT",
"version": "v1"
},
{
"created": "Mon, 24 May 2021 16:04:04 GMT",
"version": "v2"
}
] | 2021-06-30 | [
[
"Arora",
"Simran",
""
],
[
"Parida",
"Abhishek",
""
],
[
"Sahoo",
"P. K.",
""
]
] | New high-precision observations are now possible to constrain different gravity theories. To examine the accelerated expansion of the Universe, we used the newly proposed $f(Q,T)$ gravity, where $Q$ is the non-metricity, and $T$ is the trace of the energy-momentum tensor. The investigation is carried out using a parame... |
1112.3414 | James Strohaber | J. Strohaber | Frame dragging with optical vortices | 13 pages, 2 figures | Gen.Relatic.Gravit. 4 (2013) 2457-2465 | 10.1007/s10714-013-1596-8 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General Relativistic calculations in the linear regime have been made for
electromagnetic beams of radiation known as optical vortices. These exotic
beams of light carry a physical quantity known as optical orbital angular
momentum (OAM). It is found that when a massive spinning neutral particle is
placed along the o... | [
{
"created": "Thu, 15 Dec 2011 03:10:18 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Oct 2012 00:18:50 GMT",
"version": "v2"
}
] | 2016-05-03 | [
[
"Strohaber",
"J.",
""
]
] | General Relativistic calculations in the linear regime have been made for electromagnetic beams of radiation known as optical vortices. These exotic beams of light carry a physical quantity known as optical orbital angular momentum (OAM). It is found that when a massive spinning neutral particle is placed along the opt... |
2403.03601 | Alvaro Torres-Caballeros | Jer\'onimo Cortez, Guillermo A. Mena Marug\'an, Alvaro
Torres-Caballeros, Jos\'e M. Velhinho | Time-dependent scalings and Fock quantization of a massless scalar field
in Kantowski-Sachs | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the issue of inequivalent Fock representations in Quantum Field
Theory in a curved homogenous and anisotropic background, namely
Kantowski-Sachs spacetime. A family of unitarily equivalent Fock
representations that are invariant under the spatial isometries and implement a
unitary dynamics can be achieved ... | [
{
"created": "Wed, 6 Mar 2024 10:40:31 GMT",
"version": "v1"
}
] | 2024-03-07 | [
[
"Cortez",
"Jerónimo",
""
],
[
"Marugán",
"Guillermo A. Mena",
""
],
[
"Torres-Caballeros",
"Alvaro",
""
],
[
"Velhinho",
"José M.",
""
]
] | We address the issue of inequivalent Fock representations in Quantum Field Theory in a curved homogenous and anisotropic background, namely Kantowski-Sachs spacetime. A family of unitarily equivalent Fock representations that are invariant under the spatial isometries and implement a unitary dynamics can be achieved by... |
1512.03902 | Anirban Saha Dr. | Somnath Bhattacharya, Pradip Mukherjee, Amit Singha Roy, Anirban Saha | Non-minimally coupled quintessence DE model with a cubic galileon term
--A Dynamical System Analysis | Revised version (Abstract, Introduction, Numerical section thoroughly
rewriten), minor errors corrected, LaTex, 16 pages, 9 figures | Eur.Phys.J. C78 (2018) no.3, 201 | 10.1140/epjc/s10052-018-5644-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a scalar field which is generallly non-minimally coupled to
gravity and has a characteristic cubic Galilean-like term in the kinetic part
of the action, in presence of a generic self-interaction as a candidate Dark
Energy model. The system is dynamically analyzed and novel fixed points with
perturbative s... | [
{
"created": "Sat, 12 Dec 2015 11:04:48 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Aug 2016 12:47:45 GMT",
"version": "v2"
}
] | 2020-01-15 | [
[
"Bhattacharya",
"Somnath",
""
],
[
"Mukherjee",
"Pradip",
""
],
[
"Roy",
"Amit Singha",
""
],
[
"Saha",
"Anirban",
""
]
] | We consider a scalar field which is generallly non-minimally coupled to gravity and has a characteristic cubic Galilean-like term in the kinetic part of the action, in presence of a generic self-interaction as a candidate Dark Energy model. The system is dynamically analyzed and novel fixed points with perturbative sta... |
1610.05198 | Eloisa Bentivegna | Eloisa Bentivegna | An automatically generated code for relativistic inhomogeneous
cosmologies | 11 pages, 6 figures | Phys. Rev. D 95, 044046 (2017) | 10.1103/PhysRevD.95.044046 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The applications of numerical relativity to cosmology are on the rise,
contributing insight into such cosmological problems as structure formation,
primordial phase transitions, gravitational-wave generation, and inflation. In
this paper, I present the infrastructure for the computation of inhomogeneous
dust cosmolog... | [
{
"created": "Mon, 17 Oct 2016 16:39:33 GMT",
"version": "v1"
}
] | 2017-03-08 | [
[
"Bentivegna",
"Eloisa",
""
]
] | The applications of numerical relativity to cosmology are on the rise, contributing insight into such cosmological problems as structure formation, primordial phase transitions, gravitational-wave generation, and inflation. In this paper, I present the infrastructure for the computation of inhomogeneous dust cosmologie... |
1611.08878 | Frederic P. Schuller | Maximilian D\"ull, Frederic P. Schuller, Nadine Stritzelberger,
Florian Wolz | Gravitational closure of matter field equations | 48 pages, 5 figures | Phys. Rev. D 97, 084036 (2018) | 10.1103/PhysRevD.97.084036 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The requirement that both the matter and the geometry of a spacetime
canonically evolve together, starting and ending on shared Cauchy surfaces and
independently of the intermediate foliation, leaves one with little choice for
diffeomorphism-invariant gravitational dynamics that can provide consistent
evolution equat... | [
{
"created": "Sun, 27 Nov 2016 17:37:12 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jul 2017 16:33:06 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Feb 2018 10:17:36 GMT",
"version": "v3"
}
] | 2018-05-02 | [
[
"Düll",
"Maximilian",
""
],
[
"Schuller",
"Frederic P.",
""
],
[
"Stritzelberger",
"Nadine",
""
],
[
"Wolz",
"Florian",
""
]
] | The requirement that both the matter and the geometry of a spacetime canonically evolve together, starting and ending on shared Cauchy surfaces and independently of the intermediate foliation, leaves one with little choice for diffeomorphism-invariant gravitational dynamics that can provide consistent evolution equatio... |
2205.07629 | Kimet Jusufi | Kimet Jusufi, Salvatore Capozziello, Sebastian Bahamonde, Mubasher
Jamil | Testing Born-Infeld $f(T)$ teleparallel gravity through Sgr A$^\star$
observations | 12 pages, accepted for publication in The European Physical Journal C | Eur. Phys. J. C 82, 1018 (2022) | 10.1140/epjc/s10052-022-10971-0 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use observational data from the S2 star orbiting around the Galactic
Center to constrain a black hole solution of extended teleparallel gravity
models. Subsequently, we construct the shadow images of Sgr A$^{\star}$ black
hole. In particular, we constrain the parameter $\alpha=1/\lambda$ which
appears in the Born-... | [
{
"created": "Fri, 13 May 2022 11:07:25 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Nov 2022 15:55:09 GMT",
"version": "v2"
}
] | 2022-11-15 | [
[
"Jusufi",
"Kimet",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"Bahamonde",
"Sebastian",
""
],
[
"Jamil",
"Mubasher",
""
]
] | We use observational data from the S2 star orbiting around the Galactic Center to constrain a black hole solution of extended teleparallel gravity models. Subsequently, we construct the shadow images of Sgr A$^{\star}$ black hole. In particular, we constrain the parameter $\alpha=1/\lambda$ which appears in the Born-In... |
0906.2503 | Jakub Mielczarek | Jakub Mielczarek, Orest Hrycyna, Marek Szydlowski | Effective dynamics of the closed loop quantum cosmology | 18 pages, 11 figures | JCAP 0911:014,2009 | 10.1088/1475-7516/2009/11/014 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study dynamics of the closed FRW model with holonomy
corrections coming from loop quantum cosmology. We consider models with a
scalar field and cosmological constant. In case of the models with cosmological
constant and free scalar field, dynamics reduce to 2D system and analysis of
solutions simplif... | [
{
"created": "Sat, 13 Jun 2009 21:20:54 GMT",
"version": "v1"
}
] | 2009-11-19 | [
[
"Mielczarek",
"Jakub",
""
],
[
"Hrycyna",
"Orest",
""
],
[
"Szydlowski",
"Marek",
""
]
] | In this paper we study dynamics of the closed FRW model with holonomy corrections coming from loop quantum cosmology. We consider models with a scalar field and cosmological constant. In case of the models with cosmological constant and free scalar field, dynamics reduce to 2D system and analysis of solutions simplify.... |
1511.05048 | Jaume Haro | Jaume de Haro | Bouncing cosmologies in geometries with positively curved spatial
sections | Version accepted for publication in PLB | null | 10.1016/j.physletb.2016.07.053 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Background boucing cosmologies in the framework of General Relativity, driven
by a single scalar field filling the Universe, and with a quasi-matter
domination period, i.e., depicting the so-called Matter Bounce Scenario, are
reconstructed for geometries with positive spatial curvature. These cosmologies
lead to a ne... | [
{
"created": "Mon, 16 Nov 2015 17:24:22 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Dec 2015 08:35:54 GMT",
"version": "v2"
},
{
"created": "Thu, 21 Jul 2016 09:07:43 GMT",
"version": "v3"
}
] | 2017-03-22 | [
[
"de Haro",
"Jaume",
""
]
] | Background boucing cosmologies in the framework of General Relativity, driven by a single scalar field filling the Universe, and with a quasi-matter domination period, i.e., depicting the so-called Matter Bounce Scenario, are reconstructed for geometries with positive spatial curvature. These cosmologies lead to a near... |
1603.09675 | Lorenzo Sebastiani | Lorenzo Sebastiani and Ratbay Myrzakulov | $k$-essence for warm inflation on the brane | 14 pages | null | 10.1142/S0219887817500931 | Int. J. Geom. Methods Mod. Phys. 14, 1750093 (2017) | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, $k$-inflation is analyzed in warm braneworld scenario. A
general class of $k$-essence models with power-law kinetic term is investigated
and weak and strong dissipation regimes are studied. Scalar perturbations and
spectral index are derived. The results are discussed and applied to specific
examples.
| [
{
"created": "Wed, 30 Mar 2016 12:14:04 GMT",
"version": "v1"
}
] | 2017-05-16 | [
[
"Sebastiani",
"Lorenzo",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] | In this paper, $k$-inflation is analyzed in warm braneworld scenario. A general class of $k$-essence models with power-law kinetic term is investigated and weak and strong dissipation regimes are studied. Scalar perturbations and spectral index are derived. The results are discussed and applied to specific examples. |
1611.09491 | Changfu Shi | Changfu Shi and Jianwei Mei | Extended Symmetries at Black Hole Horizons in Generic Dimensions | 17 pages, 0 figures | Phys. Rev. D 95, 104053 (2017) | 10.1103/PhysRevD.95.104053 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently it has been shown that there is asymptotic BMS-like symmetry
associated with the near-horizon geometry of black holes in three and four
dimensions. In this paper, we show that the presence of such BMS-like symmetry
is a ubiquitous feature for black holes in generic dimensions. For black holes
in $D$ dimensio... | [
{
"created": "Tue, 29 Nov 2016 05:24:56 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 2017 03:11:28 GMT",
"version": "v2"
}
] | 2017-06-07 | [
[
"Shi",
"Changfu",
""
],
[
"Mei",
"Jianwei",
""
]
] | Recently it has been shown that there is asymptotic BMS-like symmetry associated with the near-horizon geometry of black holes in three and four dimensions. In this paper, we show that the presence of such BMS-like symmetry is a ubiquitous feature for black holes in generic dimensions. For black holes in $D$ dimensions... |
gr-qc/0110085 | Jorge Pullin | Olivier Sarbach, Manuel Tiglio, Jorge Pullin | Close limit evolution of Kerr-Schild type initial data for binary black
holes | 8 pages, RevTex, four eps figures | Phys.Rev. D65 (2002) 064026 | 10.1103/PhysRevD.65.064026 | LSU-GRG-101901 | gr-qc | null | We evolve the binary black hole initial data family proposed by Bishop {\em
et al.} in the limit in which the black holes are close to each other. We
present an exact solution of the linearized initial value problem based on
their proposal and make use of a recently introduced generalized formalism for
studying pertu... | [
{
"created": "Fri, 19 Oct 2001 14:55:42 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Sarbach",
"Olivier",
""
],
[
"Tiglio",
"Manuel",
""
],
[
"Pullin",
"Jorge",
""
]
] | We evolve the binary black hole initial data family proposed by Bishop {\em et al.} in the limit in which the black holes are close to each other. We present an exact solution of the linearized initial value problem based on their proposal and make use of a recently introduced generalized formalism for studying perturb... |
1508.05395 | Carlos A. R. Herdeiro | Richard Brito, Vitor Cardoso, Carlos A. R. Herdeiro, Eugen Radu | Proca Stars: gravitating Bose-Einstein condensates of massive spin 1
particles | 5 pages, 4 figures | Phys.Lett. B752 (2016) 291-295 | 10.1016/j.physletb.2015.11.051 | null | gr-qc astro-ph.HE hep-th nlin.PS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish that massive complex Abelian vector fields (mass $\mu$) can form
gravitating solitons, when minimally coupled to Einstein's gravity. Such Proca
stars (PSs) have a stationary, everywhere regular and asymptotically flat
geometry. The Proca field, however, possesses a harmonic time dependence
(frequency $w$... | [
{
"created": "Fri, 21 Aug 2015 20:09:11 GMT",
"version": "v1"
}
] | 2015-12-15 | [
[
"Brito",
"Richard",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Radu",
"Eugen",
""
]
] | We establish that massive complex Abelian vector fields (mass $\mu$) can form gravitating solitons, when minimally coupled to Einstein's gravity. Such Proca stars (PSs) have a stationary, everywhere regular and asymptotically flat geometry. The Proca field, however, possesses a harmonic time dependence (frequency $w$),... |
gr-qc/9406031 | Warner A. Miller | Arkady Kheyfets and Warner A. Miller | Quantum Geometrodynamics I: Quantum-Driven Many-Fingered Time | 11, (No Figures), (Typeset using RevTeX) | Phys.Rev.D51:493-501,1995 | 10.1103/PhysRevD.51.493 | null | gr-qc | null | The classical theory of gravity predicts its own demise -- singularities. We
therefore attempt to quantize gravitation, and present here a new approach to
the quantization of gravity wherein the concept of time is derived by imposing
the constraints as expectation-value equations over the true dynamical degrees
of fr... | [
{
"created": "Mon, 20 Jun 1994 19:21:23 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Kheyfets",
"Arkady",
""
],
[
"Miller",
"Warner A.",
""
]
] | The classical theory of gravity predicts its own demise -- singularities. We therefore attempt to quantize gravitation, and present here a new approach to the quantization of gravity wherein the concept of time is derived by imposing the constraints as expectation-value equations over the true dynamical degrees of free... |
1808.02894 | Manuel Hohmann | Manuel Hohmann, Christian Pfeifer, Jackson Levi Said, Ulbossyn
Ualikhanova | Propagation of gravitational waves in symmetric teleparallel gravity
theories | 9 pages, 1 figure; references updated to match published version.
arXiv admin note: substantial text overlap with arXiv:1807.04580 | Phys. Rev. D 99, 024009 (2019) | 10.1103/PhysRevD.99.024009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Symmetric teleparallel gravity (STG) offers an interesting third geometric
interpretation of gravitation besides its formulation in terms of a spacetime
metric and Levi-Civita connection or its teleparallel formulation. It describes
gravity through a connection which is not metric compatible, however is torsion
and c... | [
{
"created": "Wed, 8 Aug 2018 18:00:03 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Sep 2018 17:00:46 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Jul 2020 20:43:06 GMT",
"version": "v3"
}
] | 2020-07-08 | [
[
"Hohmann",
"Manuel",
""
],
[
"Pfeifer",
"Christian",
""
],
[
"Said",
"Jackson Levi",
""
],
[
"Ualikhanova",
"Ulbossyn",
""
]
] | Symmetric teleparallel gravity (STG) offers an interesting third geometric interpretation of gravitation besides its formulation in terms of a spacetime metric and Levi-Civita connection or its teleparallel formulation. It describes gravity through a connection which is not metric compatible, however is torsion and cur... |
1810.01863 | Shingo Akama | Shingo Akama, Tsutomu Kobayashi | General theory of cosmological perturbations in open and closed
universes from the Horndeski action | 12pages | Phys. Rev. D 99, 043522 (2019) | 10.1103/PhysRevD.99.043522 | RUP-18-31 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our Universe is nearly spatially flat, but this does not mean that it is
exactly spatially flat. In this paper we derive general quadratic actions for
cosmological perturbations in non-flat models from the Horndeski theory. This
allows us to study how the spatial curvature influences the behavior of
cosmological pert... | [
{
"created": "Wed, 3 Oct 2018 11:16:46 GMT",
"version": "v1"
}
] | 2019-02-27 | [
[
"Akama",
"Shingo",
""
],
[
"Kobayashi",
"Tsutomu",
""
]
] | Our Universe is nearly spatially flat, but this does not mean that it is exactly spatially flat. In this paper we derive general quadratic actions for cosmological perturbations in non-flat models from the Horndeski theory. This allows us to study how the spatial curvature influences the behavior of cosmological pertur... |
1107.2886 | Slava G. Turyshev | Slava G. Turyshev, Viktor T. Toth, Jordan Ellis, and Craig B.
Markwardt | Support for temporally varying behavior of the Pioneer anomaly from the
extended Pioneer 10 and 11 Doppler data sets | 4 pages, accepted to Phys. Rev. Letters | Phys. Rev. Lett. 107, 081103 (2011) | 10.1103/PhysRevLett.107.081103 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Pioneer anomaly is a small sunward anomalous acceleration found in the
trajectory analysis of the Pioneer 10 and 11 spacecraft. As part of the
investigation of the effect, analysis of recently recovered Doppler data for
both spacecraft has been completed. The presence of a small anomalous
acceleration is confirme... | [
{
"created": "Thu, 14 Jul 2011 18:31:04 GMT",
"version": "v1"
}
] | 2011-08-22 | [
[
"Turyshev",
"Slava G.",
""
],
[
"Toth",
"Viktor T.",
""
],
[
"Ellis",
"Jordan",
""
],
[
"Markwardt",
"Craig B.",
""
]
] | The Pioneer anomaly is a small sunward anomalous acceleration found in the trajectory analysis of the Pioneer 10 and 11 spacecraft. As part of the investigation of the effect, analysis of recently recovered Doppler data for both spacecraft has been completed. The presence of a small anomalous acceleration is confirmed ... |
gr-qc/9308006 | Chris Isham | C.J.Isham (Imperial College) | Quantum Logic and the Histories Approach to Quantum Theory | TP/92-93/39 36 pages + one page of diagrams (I could email Apple
laser printer postscript file for anyone who is especially keen) | J.Math.Phys. 35 (1994) 2157-2185 | 10.1063/1.530544 | null | gr-qc hep-th | null | An extended analysis is made of the Gell-Mann and Hartle axioms for a
generalised `histories' approach to quantum theory. Emphasis is placed on
finding equivalents of the lattice structure that is employed in standard
quantum logic. Particular attention is given to `quasi-temporal' theories in
which the notion of tim... | [
{
"created": "Mon, 9 Aug 1993 10:50:13 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Isham",
"C. J.",
"",
"Imperial College"
]
] | An extended analysis is made of the Gell-Mann and Hartle axioms for a generalised `histories' approach to quantum theory. Emphasis is placed on finding equivalents of the lattice structure that is employed in standard quantum logic. Particular attention is given to `quasi-temporal' theories in which the notion of time-... |
1211.4426 | Horst R. Beyer | Horst Reinhard Beyer | Nonuniqueness of Representations of Wave Equations in Lorentzian
Space-Times | null | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This brief note wants to bring to attention that the formulation of
physically reasonable initial-boundary value problems for wave equations in
Lorentzian space-times is not unique, i.e., that there are inequivalent such
formulations that lead to a different outcome of the stability discussion of
the solutions. For d... | [
{
"created": "Mon, 19 Nov 2012 14:14:58 GMT",
"version": "v1"
}
] | 2012-11-20 | [
[
"Beyer",
"Horst Reinhard",
""
]
] | This brief note wants to bring to attention that the formulation of physically reasonable initial-boundary value problems for wave equations in Lorentzian space-times is not unique, i.e., that there are inequivalent such formulations that lead to a different outcome of the stability discussion of the solutions. For dem... |
gr-qc/0301020 | Gaetano Vilasi | G. Sparano, G. Vilasi, A. Vinogradov | Vacuum Einstein metrics with bidimensional Killing leaves. I-Local
aspects | LateX file, 33 pages, 2 figures | Differ.Geom.Appl. 16 (2002) 95-120 | null | null | gr-qc | null | The solutions of vacuum Einstein's field equations, for the class of
Riemannian metrics admitting a non Abelian bidimensional Lie algebra of Killing
fields, are explicitly described. They are parametrized either by solutions of
a transcendental equation (the tortoise equation), or by solutions of a linear
second orde... | [
{
"created": "Tue, 7 Jan 2003 16:15:28 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sparano",
"G.",
""
],
[
"Vilasi",
"G.",
""
],
[
"Vinogradov",
"A.",
""
]
] | The solutions of vacuum Einstein's field equations, for the class of Riemannian metrics admitting a non Abelian bidimensional Lie algebra of Killing fields, are explicitly described. They are parametrized either by solutions of a transcendental equation (the tortoise equation), or by solutions of a linear second order ... |
0908.1300 | Jakob Hansen | Andrey Doroshkevich, Jakob Hansen, Dmitriy Novikov, Igor Novikov,
Dong-Ho Park, Alexander Shatskiy | Physics of the interior of a black hole with an exotic scalar matter | 16 pages, 16 figures. Text has been rewritten and restructured,
Penrose diagrams have been added, appendix with convergence tests has been
added. Co-author has been added. Conclusions are unchanged | Phys.Rev.D81:124011,2010 | 10.1103/PhysRevD.81.124011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a numerical code to consider the nonlinear processes arising when a
Reissner-Nordstrom black hole is irradiated by an exotic scalar field (modelled
as a free massless scalar field with an opposite sign for its energy-momentum
tensor). These processes are quite different from the processes arising in the
case o... | [
{
"created": "Mon, 10 Aug 2009 11:58:13 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Aug 2009 01:14:14 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Jun 2010 08:20:21 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Doroshkevich",
"Andrey",
""
],
[
"Hansen",
"Jakob",
""
],
[
"Novikov",
"Dmitriy",
""
],
[
"Novikov",
"Igor",
""
],
[
"Park",
"Dong-Ho",
""
],
[
"Shatskiy",
"Alexander",
""
]
] | We use a numerical code to consider the nonlinear processes arising when a Reissner-Nordstrom black hole is irradiated by an exotic scalar field (modelled as a free massless scalar field with an opposite sign for its energy-momentum tensor). These processes are quite different from the processes arising in the case of ... |
2110.11171 | Shubhanshu Tiwari | Shubhanshu Tiwari, Michael Ebersold, Eleanor Z. Hamilton | Leveraging gravitational-wave memory to distinguish neutron star--black
hole binaries from black hole binaries | Accepted in PRD | null | 10.1103/PhysRevD.104.123024 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | In the observation of gravitational waves (GWs) from a compact binary
coalescence system where the mass of one of the companions is $\leq
5~M_{\odot}$ the nature of the object is ambiguous until the measurements of
tidal effects give evidence for the presence of a neutron star (NS) or a low
mass black hole (BH). The ... | [
{
"created": "Thu, 21 Oct 2021 14:33:24 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 2021 12:22:21 GMT",
"version": "v2"
}
] | 2021-12-20 | [
[
"Tiwari",
"Shubhanshu",
""
],
[
"Ebersold",
"Michael",
""
],
[
"Hamilton",
"Eleanor Z.",
""
]
] | In the observation of gravitational waves (GWs) from a compact binary coalescence system where the mass of one of the companions is $\leq 5~M_{\odot}$ the nature of the object is ambiguous until the measurements of tidal effects give evidence for the presence of a neutron star (NS) or a low mass black hole (BH). The re... |
1402.7307 | Alessandro Nagar | Thibault Damour, Federico Guercilena, Ian Hinder, Seth Hopper,
Alessandro Nagar and Luciano Rezzolla | Strong-Field Scattering of Two Black Holes: Numerics Versus Analytics | 5 pages, 3 figures. Submitted to Physical Review Letters | PRDR, 89, 081503 (2014) | 10.1103/PhysRevD.89.081503 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We probe the gravitational interaction of two black holes in the strong-field
regime by computing the scattering angle $\chi$ of hyperbolic-like, close
binary-black-hole encounters as a function of the impact parameter. The fully
general-relativistic result from numerical relativity is compared to two
analytic approx... | [
{
"created": "Fri, 28 Feb 2014 16:30:42 GMT",
"version": "v1"
}
] | 2014-07-18 | [
[
"Damour",
"Thibault",
""
],
[
"Guercilena",
"Federico",
""
],
[
"Hinder",
"Ian",
""
],
[
"Hopper",
"Seth",
""
],
[
"Nagar",
"Alessandro",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | We probe the gravitational interaction of two black holes in the strong-field regime by computing the scattering angle $\chi$ of hyperbolic-like, close binary-black-hole encounters as a function of the impact parameter. The fully general-relativistic result from numerical relativity is compared to two analytic approxim... |
2307.03012 | Sanjar Shaymatov | Sanjar Shaymatov, Mirzabek Alloqulov, Bobomurat Ahmedov, Anzhong Wang | Kerr-Newman-modified-gravity black hole's impact on the magnetic
reconnection | 15 pages, one table, 8 captioned figures. Accepted for publication in
Phys. Rev. D | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the magnetic reconnection process of energy
extraction from a rapidly rotating Kerr-Newman-modified-gravity (MOG) black
hole by investigating the combined effect of black hole charge and the MOG
parameter. We explore the energy efficiency of energy extraction and power by
applying the new ener... | [
{
"created": "Thu, 6 Jul 2023 14:21:21 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Jul 2023 06:08:26 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Jul 2024 13:36:58 GMT",
"version": "v3"
}
] | 2024-07-19 | [
[
"Shaymatov",
"Sanjar",
""
],
[
"Alloqulov",
"Mirzabek",
""
],
[
"Ahmedov",
"Bobomurat",
""
],
[
"Wang",
"Anzhong",
""
]
] | In this paper, we study the magnetic reconnection process of energy extraction from a rapidly rotating Kerr-Newman-modified-gravity (MOG) black hole by investigating the combined effect of black hole charge and the MOG parameter. We explore the energy efficiency of energy extraction and power by applying the new energy... |
2305.02796 | Alexander Timoshkin | A.V.Timoshkin, A.V. Yurov | Little Rip, Pseudo Rip and bounce cosmology from generalized equation of
state in the Universe with spatial curvature | to appear in International Journal of Geometric Methods in Modern
Physics | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the Little Rip (LR), Pseudo Rip (PR) and bounce cosmological
models in the Friedmann-Robertson-Walker (FRW) metric with nonzero spatial
curvature. We describe the evolution of the universe using a generalized
equation of state in the presence of a viscous fluid. The conditions of the
occurrence of the LR,... | [
{
"created": "Thu, 4 May 2023 12:55:48 GMT",
"version": "v1"
}
] | 2023-05-05 | [
[
"Timoshkin",
"A. V.",
""
],
[
"Yurov",
"A. V.",
""
]
] | We consider the Little Rip (LR), Pseudo Rip (PR) and bounce cosmological models in the Friedmann-Robertson-Walker (FRW) metric with nonzero spatial curvature. We describe the evolution of the universe using a generalized equation of state in the presence of a viscous fluid. The conditions of the occurrence of the LR, P... |
1603.07338 | William C. C. Lima | Markus B. Fr\"ob, Atsushi Higuchi, William C. C. Lima | Mode-sum construction of the covariant graviton two-point function in
the Poincar\'e patch of de Sitter space | 28 pages. Introduction and Discussion sections improved and
references added. Published version | Phys. Rev. D 93, 124006 (2016) | 10.1103/PhysRevD.93.124006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the graviton two-point function for a two-parameter family of
linear covariant gauges in n-dimensional de Sitter space. The construction is
performed via the mode-sum method in the Bunch-Davies vacuum in the Poincar\'e
patch, and a Fierz-Pauli mass term is introduced to regularize the infrared
(IR) diver... | [
{
"created": "Wed, 23 Mar 2016 20:01:01 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jun 2016 15:22:08 GMT",
"version": "v2"
}
] | 2016-06-03 | [
[
"Fröb",
"Markus B.",
""
],
[
"Higuchi",
"Atsushi",
""
],
[
"Lima",
"William C. C.",
""
]
] | We construct the graviton two-point function for a two-parameter family of linear covariant gauges in n-dimensional de Sitter space. The construction is performed via the mode-sum method in the Bunch-Davies vacuum in the Poincar\'e patch, and a Fierz-Pauli mass term is introduced to regularize the infrared (IR) diverge... |
2203.14970 | Titus Masese PhD | Godwill Mbiti Kanyolo and Titus Masese | On local conservation of information content in Schwarzschild black
holes | 12 pages | Journal of Physics Communications (IOP), Volume 6, Number 4 (2022) | 10.1088/2399-6528/ac6136 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The central equations in classical general relativity are the Einstein Field
Equations, which accurately describe not only the generation of
pseudo-Riemannian curvature by matter and radiation manifesting as
gravitational effects, but more importantly mass-energy dynamics, evolution and
distribution on the space-time... | [
{
"created": "Mon, 28 Mar 2022 13:46:01 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Apr 2022 13:43:39 GMT",
"version": "v2"
}
] | 2022-04-07 | [
[
"Kanyolo",
"Godwill Mbiti",
""
],
[
"Masese",
"Titus",
""
]
] | The central equations in classical general relativity are the Einstein Field Equations, which accurately describe not only the generation of pseudo-Riemannian curvature by matter and radiation manifesting as gravitational effects, but more importantly mass-energy dynamics, evolution and distribution on the space-time m... |
1805.08361 | M. E. Carrington | Margaret E. Carrington, Gabor Kunstatter, Jorma Louko and L.J. Zhou | Smooth and sharp creation of a spherical shell for a $(3+1)$-dimensional
quantum field | 35 pages, 1 figure | Phys. Rev. D 98, 024035 (2018) | 10.1103/PhysRevD.98.024035 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the creation of a spherical, finite radius source for a quantized
massless scalar field in 3+1 dimensions. The goal is to model the breakdown of
correlations that has been proposed to occur at the horizon of an evaporating
black hole. We do this by introducing at fixed radius $r=a$ a one parameter
family of ... | [
{
"created": "Tue, 22 May 2018 02:35:28 GMT",
"version": "v1"
}
] | 2018-07-25 | [
[
"Carrington",
"Margaret E.",
""
],
[
"Kunstatter",
"Gabor",
""
],
[
"Louko",
"Jorma",
""
],
[
"Zhou",
"L. J.",
""
]
] | We study the creation of a spherical, finite radius source for a quantized massless scalar field in 3+1 dimensions. The goal is to model the breakdown of correlations that has been proposed to occur at the horizon of an evaporating black hole. We do this by introducing at fixed radius $r=a$ a one parameter family of se... |
gr-qc/0609068 | Luis Herrera | F.Debbasch, L.Herrera, P.R.C.T.Pereira and N.O.Santos | Stationary Cylindrical Anisotropic Fluid | 17 pages Latex. To appear in Gen.Rel.Grav | Gen.Rel.Grav. 38 (2006) 1825 | 10.1007/s10714-006-0351-9 | null | gr-qc | null | We present the whole set of equations with regularity and matching conditions
required for the description of physically meaningful stationary cylindrically
symmmetric distributions of matter, smoothly matched to Lewis vacuum spacetime.
A specific example is given. The electric and magnetic parts of the Weyl tensor
a... | [
{
"created": "Mon, 18 Sep 2006 19:25:51 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Debbasch",
"F.",
""
],
[
"Herrera",
"L.",
""
],
[
"Pereira",
"P. R. C. T.",
""
],
[
"Santos",
"N. O.",
""
]
] | We present the whole set of equations with regularity and matching conditions required for the description of physically meaningful stationary cylindrically symmmetric distributions of matter, smoothly matched to Lewis vacuum spacetime. A specific example is given. The electric and magnetic parts of the Weyl tensor are... |
2306.01695 | Thomas Sotiriou | Farid Thaalba, Miguel Bezares, Nicola Franchini, Thomas P. Sotiriou | Spherical collapse in scalar-Gauss-Bonnet gravity: taming ill-posedness
with a Ricci coupling | 6 pages, 4 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study spherical collapse of a scalar cloud in scalar-Gauss-Bonnet gravity
- a theory in which black holes can develop scalar hair if they are in a
certain mass range. We show that an additional quadratic coupling of the scalar
field to the Ricci scalar can mitigate loss of hyperbolicity problems that have
plagued ... | [
{
"created": "Fri, 2 Jun 2023 17:12:26 GMT",
"version": "v1"
}
] | 2023-06-05 | [
[
"Thaalba",
"Farid",
""
],
[
"Bezares",
"Miguel",
""
],
[
"Franchini",
"Nicola",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | We study spherical collapse of a scalar cloud in scalar-Gauss-Bonnet gravity - a theory in which black holes can develop scalar hair if they are in a certain mass range. We show that an additional quadratic coupling of the scalar field to the Ricci scalar can mitigate loss of hyperbolicity problems that have plagued pr... |
1402.3586 | Deepak Vaid | Sundance Bilson-Thompson, Deepak Vaid | LQG for the Bewildered | 87 pages, 15 figures, manuscript submitted for publication | null | 10.1007/978-3-319-43184-0 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | We present a pedagogical introduction to the notions underlying the
connection formulation of General Relativity - Loop Quantum Gravity (LQG) -
with an emphasis on the physical aspects of the framework. We begin by
reviewing General Relativity and Quantum Field Theory, to emphasise the
similarities between them which... | [
{
"created": "Fri, 14 Feb 2014 20:57:14 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Feb 2014 07:36:53 GMT",
"version": "v2"
},
{
"created": "Sun, 1 Feb 2015 20:36:46 GMT",
"version": "v3"
}
] | 2017-01-10 | [
[
"Bilson-Thompson",
"Sundance",
""
],
[
"Vaid",
"Deepak",
""
]
] | We present a pedagogical introduction to the notions underlying the connection formulation of General Relativity - Loop Quantum Gravity (LQG) - with an emphasis on the physical aspects of the framework. We begin by reviewing General Relativity and Quantum Field Theory, to emphasise the similarities between them which e... |
2205.11541 | Jo\~ao Lu\'is Rosa | Jo\~ao Lu\'is Rosa, Paulo Garcia, Fr\'ed\'eric H. Vincent, Vitor
Cardoso | Observational signatures of hot spots orbiting horizonless objects | 20 pages, 18 figures | Phys. Rev. D 106, 044031 (2022) | 10.1103/PhysRevD.106.044031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pushed by a number of advances, electromagnetic observatories have now
reached the horizon scale of supermassive black holes. The existence and
properties of horizons in our universe is one of the outstanding fundamental
issues that can now be addressed. Here we investigate the ability to
discriminate between black h... | [
{
"created": "Mon, 23 May 2022 18:00:06 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Aug 2022 15:44:03 GMT",
"version": "v2"
}
] | 2022-08-16 | [
[
"Rosa",
"João Luís",
""
],
[
"Garcia",
"Paulo",
""
],
[
"Vincent",
"Frédéric H.",
""
],
[
"Cardoso",
"Vitor",
""
]
] | Pushed by a number of advances, electromagnetic observatories have now reached the horizon scale of supermassive black holes. The existence and properties of horizons in our universe is one of the outstanding fundamental issues that can now be addressed. Here we investigate the ability to discriminate between black hol... |
gr-qc/0311033 | Jose M. M. Senovilla | Jos\'e M. M. Senovilla | New conservation laws for electromagnetic fields in gravity | 12 pages, to be published in the proceedings "Symmetries and gravity
in field theory", Workshop in honour of Prof. J. A. de Azc\'arraga, June
9-11, 2003, Salamanca (Spain), V Aldaya and J M Cerver\'o eds. (Ediciones
Universidad de Salamanca, Salamanca) | null | null | null | gr-qc | null | A recently found (gr-qc/0303036) 2-index, symmetric, trace-free,
divergence-free tensor is introduced for arbitrary source-free electromagnetic
fields. The tensor can be constructed for any test Maxwell field in Einstein
spaces (including proper vacuum), and more importantly for any Einstein-Maxwell
spacetime. The te... | [
{
"created": "Mon, 10 Nov 2003 17:23:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Senovilla",
"José M. M.",
""
]
] | A recently found (gr-qc/0303036) 2-index, symmetric, trace-free, divergence-free tensor is introduced for arbitrary source-free electromagnetic fields. The tensor can be constructed for any test Maxwell field in Einstein spaces (including proper vacuum), and more importantly for any Einstein-Maxwell spacetime. The tens... |
1410.7360 | Benjamin J. Owen | Ashikuzzaman Idrisy, Benjamin J. Owen, and David I. Jones | R-mode frequencies of slowly rotating relativistic neutron stars with
realistic equations of state | 16 pages, 5 figures | Phys. Rev. D 91, 024001 (2015) | 10.1103/PhysRevD.91.024001 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The frequencies of r-mode oscillations of rotating neutron stars can be
useful for guiding and interpreting gravitational wave and electromagnetic
observations. The frequencies of slowly rotating, barotropic, and non-magnetic
Newtonian stars are well known, but subject to various corrections. After
making simple esti... | [
{
"created": "Mon, 27 Oct 2014 19:18:28 GMT",
"version": "v1"
}
] | 2015-01-14 | [
[
"Idrisy",
"Ashikuzzaman",
""
],
[
"Owen",
"Benjamin J.",
""
],
[
"Jones",
"David I.",
""
]
] | The frequencies of r-mode oscillations of rotating neutron stars can be useful for guiding and interpreting gravitational wave and electromagnetic observations. The frequencies of slowly rotating, barotropic, and non-magnetic Newtonian stars are well known, but subject to various corrections. After making simple estima... |
2302.07132 | Bivudutta Mishra Dr. | L.K. Duchaniya, Santosh V Lohakare, B.Mishra | Cosmological models in $f (T, \mathcal{T})$ gravity and the dynamical
system analysis | 13 pages, 6 figures. Accepted version Physics of the Dark Universe | Physics of the Dark Universe, 43 (2024) 101402 | 10.1016/j.dark.2023.101402 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The study addresses matter-coupled modified gravity, particularly $f (T,
\mathcal{T})$ gravity, unveiling distinct formalism. The research further
discusses stability analysis, and the dynamical system approach, exploring the
dynamics of critical points to understand these models' viability better. The
dynamical syst... | [
{
"created": "Mon, 13 Feb 2023 11:36:55 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Dec 2023 14:29:26 GMT",
"version": "v2"
}
] | 2023-12-22 | [
[
"Duchaniya",
"L. K.",
""
],
[
"Lohakare",
"Santosh V",
""
],
[
"Mishra",
"B.",
""
]
] | The study addresses matter-coupled modified gravity, particularly $f (T, \mathcal{T})$ gravity, unveiling distinct formalism. The research further discusses stability analysis, and the dynamical system approach, exploring the dynamics of critical points to understand these models' viability better. The dynamical system... |
gr-qc/0102074 | Luca Lusanna | Luca Lusanna (INFN, Firenze) and Stefano Russo | A New Parametrization for Tetrad Gravity | 50 pages, revtex file | Gen.Rel.Grav.34:189-242,2002 | 10.1023/A:1015387310306 | FI-TH/01-26 | gr-qc | null | A new version of tetrad gravity in globally hyperbolic, asymptotically flat
at spatial infinity spacetimes with Cauchy surfaces diffeomorphic to $R^3$ is
obtained by using a new parametrization of arbitrary cotetrads to define a set
of configurational variables to be used in the ADM metric action. Seven of the
fourte... | [
{
"created": "Fri, 16 Feb 2001 11:40:40 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Lusanna",
"Luca",
"",
"INFN, Firenze"
],
[
"Russo",
"Stefano",
""
]
] | A new version of tetrad gravity in globally hyperbolic, asymptotically flat at spatial infinity spacetimes with Cauchy surfaces diffeomorphic to $R^3$ is obtained by using a new parametrization of arbitrary cotetrads to define a set of configurational variables to be used in the ADM metric action. Seven of the fourteen... |
gr-qc/0412028 | J. Fernando Barbero G. | J. Fernando Barbero G., Guillermo A. Mena Marug\'an, Eduardo J. S.
Villase\~nor | Asymptotics of Regulated Field Commutators for Einstein-Rosen Waves | 9 figures, 19 pages in DIN A4 format. Accepted for publication in
Journal of Mathematical Physics | J.Math.Phys. 46 (2005) 062306 | 10.1063/1.1864251 | null | gr-qc | null | We discuss the asymptotic behavior of regulated field commutators for
linearly polarized, cylindrically symmetric gravitational waves and the
mathematical techniques needed for this analysis. We concentrate our attention
on the effects brought about by the introduction of a physical cut-off in the
study of the microc... | [
{
"created": "Tue, 7 Dec 2004 09:52:40 GMT",
"version": "v1"
}
] | 2017-02-01 | [
[
"G.",
"J. Fernando Barbero",
""
],
[
"Marugán",
"Guillermo A. Mena",
""
],
[
"Villaseñor",
"Eduardo J. S.",
""
]
] | We discuss the asymptotic behavior of regulated field commutators for linearly polarized, cylindrically symmetric gravitational waves and the mathematical techniques needed for this analysis. We concentrate our attention on the effects brought about by the introduction of a physical cut-off in the study of the microcau... |
1405.1146 | Daniele Malafarina | Pankaj S. Joshi, Daniele Malafarina | All black holes in Lemaitre-Tolman-Bondi inhomogeneous dust collapse | 10 pages, 2 figures, matches published version | 2015 Class. Quantum Grav. 32 145004 | 10.1088/0264-9381/32/14/145004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the Lemaitre-Tolman-Bondi formalism for gravitational collapse of
inhomogeneous dust we analyze the parameter space that leads to the formation
of a globally covered singularity (i.e. a black hole) when some physically
reasonable requirements are imposed (namely positive radially decreasing and
quadratic profi... | [
{
"created": "Tue, 6 May 2014 04:01:17 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Sep 2015 05:01:42 GMT",
"version": "v2"
}
] | 2015-09-09 | [
[
"Joshi",
"Pankaj S.",
""
],
[
"Malafarina",
"Daniele",
""
]
] | Within the Lemaitre-Tolman-Bondi formalism for gravitational collapse of inhomogeneous dust we analyze the parameter space that leads to the formation of a globally covered singularity (i.e. a black hole) when some physically reasonable requirements are imposed (namely positive radially decreasing and quadratic profile... |
gr-qc/9603048 | null | Luc Blanchet | Energy losses by gravitational radiation in inspiralling compact
binaries to five halves post-Newtonian order | 39 pages, version which includes the correction of an Erratum to be
published in Phys. Rev. D (2005) | Phys.Rev.D54:1417-1438,1996; Erratum-ibid.D71:129904,2005 | 10.1103/PhysRevD.54.1417 10.1103/PhysRevD.71.129904 | null | gr-qc | null | This paper derives the total power or energy loss rate generated in the form
of gravitational waves by an inspiralling compact binary system to the five
halves post-Newtonian (2.5PN) approximation of general relativity. Extending a
recently developed gravitational-wave generation formalism valid for arbitrary
(slowly... | [
{
"created": "Tue, 26 Mar 1996 16:51:46 GMT",
"version": "v1"
},
{
"created": "Fri, 27 May 2005 15:42:26 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Blanchet",
"Luc",
""
]
] | This paper derives the total power or energy loss rate generated in the form of gravitational waves by an inspiralling compact binary system to the five halves post-Newtonian (2.5PN) approximation of general relativity. Extending a recently developed gravitational-wave generation formalism valid for arbitrary (slowly-m... |
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