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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1606.03005 | Roberto Pierini | Roberto Pierini, Shahpoor Moradi and Stefano Mancini | Spacetime anisotropy affects cosmological entanglement | 14 pages | Nuclear Physics B 924 (2017) 684 | 10.1016/j.nuclphysb.2017.09.025 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most existing cosmological entanglement studies are focused on the isotropic
Robertson-Walker (RW) spacetime. Here we go beyond this limitation and study
the influence of anisotropy on entanglement generated by dynamical spacetime.
Since the isotropic spacetime is viewed as a background medium and the
anisotropy is i... | [
{
"created": "Thu, 9 Jun 2016 15:47:12 GMT",
"version": "v1"
}
] | 2017-11-16 | [
[
"Pierini",
"Roberto",
""
],
[
"Moradi",
"Shahpoor",
""
],
[
"Mancini",
"Stefano",
""
]
] | Most existing cosmological entanglement studies are focused on the isotropic Robertson-Walker (RW) spacetime. Here we go beyond this limitation and study the influence of anisotropy on entanglement generated by dynamical spacetime. Since the isotropic spacetime is viewed as a background medium and the anisotropy is inc... |
gr-qc/9803052 | Janna Levin | Janna Levin | Curing singularities: From the big bang to black holes | To appear as a brief report in Phys. Rev. D | Phys.Rev. D57 (1998) 7611-7614 | 10.1103/PhysRevD.57.7611 | CfPA-97-TH-08 | gr-qc | null | Singular spacetimes are a natural prediction of Einstein's theory. Most
memorable are the singular centers of black holes and the big bang. However,
dilatonic extensions of Einstein's theory can support nonsingular spacetimes.
The cosmological singularities can be avoided by dilaton driven inflation.
Furthermore, a n... | [
{
"created": "Fri, 13 Mar 1998 19:56:51 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Levin",
"Janna",
""
]
] | Singular spacetimes are a natural prediction of Einstein's theory. Most memorable are the singular centers of black holes and the big bang. However, dilatonic extensions of Einstein's theory can support nonsingular spacetimes. The cosmological singularities can be avoided by dilaton driven inflation. Furthermore, a non... |
1208.5442 | Sharmanthie Fernando | Sharmanthie Fernando and Juan Correa | Quasinormal Modes of Bardeen Black Hole: Scalar Perturbations | 25 figures, Published in Physical Review D. Reference numbers
corrected | Physical Review D 86 (2012) 064039 | 10.1103/PhysRevD.86.064039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this paper is to study quasinormal modes (QNM) of the Bardeen
black hole due to scalar perturbations. We have done a thorough analysis of the
QNM frequencies by varying the charge $q$, mass $M$ and the spherical harmonic
index $l$. The unstable null geodesics are used to compute the QNM's in the
eikona... | [
{
"created": "Mon, 27 Aug 2012 16:50:08 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Oct 2012 18:12:51 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Aug 2013 13:38:20 GMT",
"version": "v3"
},
{
"created": "Wed, 8 Jan 2014 17:27:45 GMT",
"version": "v4"
}
] | 2015-06-11 | [
[
"Fernando",
"Sharmanthie",
""
],
[
"Correa",
"Juan",
""
]
] | The purpose of this paper is to study quasinormal modes (QNM) of the Bardeen black hole due to scalar perturbations. We have done a thorough analysis of the QNM frequencies by varying the charge $q$, mass $M$ and the spherical harmonic index $l$. The unstable null geodesics are used to compute the QNM's in the eikonal ... |
2201.09908 | Ivan Kolar | Ivan Kol\'a\v{r} | Non-local scalar fields in static spacetimes via heat kernels | 19 pages, 6 figures, comments welcome! | Phys. Rev. D 105, 084026 (2022) | 10.1103/PhysRevD.105.084026 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We solve the non-local equation ${-e^{-\ell^2\square}\square{\phi}=J}$ for i)
static scalar fields in static spacetimes and ii) time-dependent scalar fields
in ultrastatic spacetimes. Corresponding equations are rewritten as non-local
Poisson/inhomogeneous Helmholtz equations in compact and non-compact
weighted/Riema... | [
{
"created": "Mon, 24 Jan 2022 19:05:46 GMT",
"version": "v1"
}
] | 2022-04-19 | [
[
"Kolář",
"Ivan",
""
]
] | We solve the non-local equation ${-e^{-\ell^2\square}\square{\phi}=J}$ for i) static scalar fields in static spacetimes and ii) time-dependent scalar fields in ultrastatic spacetimes. Corresponding equations are rewritten as non-local Poisson/inhomogeneous Helmholtz equations in compact and non-compact weighted/Riemann... |
0704.3986 | Sergiu Vacaru I. | Sergiu I. Vacaru | Parametric Nonholonomic Frame Transforms and Exact Solutions in Gravity | a latex 2e [11pt] variant corresponding to proofs for IJMMP, 54 pages | Int.J.Geom.Meth.Mod.Phys.04:1285-1334,2008 | 10.1142/S0219887807002570 | null | gr-qc hep-th math-ph math.DG math.MP | null | A generalized geometric method is developed for constructing exact solutions
of gravitational field equations in Einstein theory and generalizations. First,
we apply the formalism of nonholonomic frame deformations (formally considered
for nonholonomic manifolds and Finsler spaces) when the gravitational field
equati... | [
{
"created": "Mon, 30 Apr 2007 17:49:57 GMT",
"version": "v1"
},
{
"created": "Tue, 1 May 2007 21:29:55 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Sep 2007 20:32:45 GMT",
"version": "v3"
},
{
"created": "Mon, 19 Nov 2007 18:07:55 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Vacaru",
"Sergiu I.",
""
]
] | A generalized geometric method is developed for constructing exact solutions of gravitational field equations in Einstein theory and generalizations. First, we apply the formalism of nonholonomic frame deformations (formally considered for nonholonomic manifolds and Finsler spaces) when the gravitational field equation... |
gr-qc/0506005 | Sergey Kozyrev | S.M.Kozyrev | Some aspects of the three dimensional gravity theories with temporal
scalar field | null | null | null | null | gr-qc | null | The present paper proposes a new explanation for the 3-dimensional Einstein
general theory of relativity which is free of contradictions and consistent
with usual 4-dimensional physics. We discuss the property of the new gravity
theory with temporal scalar field arise in lower-dimensional theories as the
reduction of... | [
{
"created": "Wed, 1 Jun 2005 05:06:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kozyrev",
"S. M.",
""
]
] | The present paper proposes a new explanation for the 3-dimensional Einstein general theory of relativity which is free of contradictions and consistent with usual 4-dimensional physics. We discuss the property of the new gravity theory with temporal scalar field arise in lower-dimensional theories as the reduction of t... |
gr-qc/9607067 | Martin Rainer | M. Rainer | The moduli space of local homogeneous 3-geometries | lecture presented at Pac. Conf. Grav. Cosm. (Feb. 1996, Seoul), 5
pages, latex (+3 figures available as hardcopy) | null | 10.1007/978-94-011-5812-1_37 | IPM-96-Seoul | gr-qc | null | For a canonical formulation of quantum gravity, the superspace of all
possible 3-geometries on a Cauchy hypersurface of a 3+1-dimensional Lorentzian
manifold plays a key role. While in the analogous 2+1-dimensional case the
superspace of all Riemannian 2-geometries is well known, the structure of the
superspace of al... | [
{
"created": "Fri, 26 Jul 1996 13:07:40 GMT",
"version": "v1"
}
] | 2016-01-27 | [
[
"Rainer",
"M.",
""
]
] | For a canonical formulation of quantum gravity, the superspace of all possible 3-geometries on a Cauchy hypersurface of a 3+1-dimensional Lorentzian manifold plays a key role. While in the analogous 2+1-dimensional case the superspace of all Riemannian 2-geometries is well known, the structure of the superspace of all ... |
1710.03272 | Lydia Bieri | Lydia Bieri, David Garfinkle, Nicolas Yunes | Gravitational Waves and Their Mathematics | null | AMS Notices, Vol. 64, Issue 07, 2017, (August issue 2017).
http://www.ams.org/publications/journals/notices/201707/rnoti-p693.pdf | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is an overview article of the mathematics of gravitational waves. We
explain the mathematics and physics of these waves in general relativity
theory, discuss the gravitational wave experiment aLIGO and their detection of
gravitational waves as well as its implications for astrophysics. A version of
this article ... | [
{
"created": "Mon, 9 Oct 2017 19:29:00 GMT",
"version": "v1"
}
] | 2017-10-11 | [
[
"Bieri",
"Lydia",
""
],
[
"Garfinkle",
"David",
""
],
[
"Yunes",
"Nicolas",
""
]
] | This is an overview article of the mathematics of gravitational waves. We explain the mathematics and physics of these waves in general relativity theory, discuss the gravitational wave experiment aLIGO and their detection of gravitational waves as well as its implications for astrophysics. A version of this article wa... |
1904.10303 | Binaya Bishi Dr | N. Hulke, G. P. Singh, Binaya K. Bishi, A. Singh | Variable Chaplygin gas cosmologies in f(R, T) gravity with particle
creation | null | null | 10.1016/j.newast.2020.101357 | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | A flat FLRW cosmological model with perfect fluid comprising of variable
Chaplygin gas has been studied in context of f(R; T) gravity with particle
creation. The considered scale factors describe the accelerated expansion of
universe due to the effective negative pressure produced during evolution of
universe. The ro... | [
{
"created": "Mon, 22 Apr 2019 08:53:21 GMT",
"version": "v1"
}
] | 2020-02-12 | [
[
"Hulke",
"N.",
""
],
[
"Singh",
"G. P.",
""
],
[
"Bishi",
"Binaya K.",
""
],
[
"Singh",
"A.",
""
]
] | A flat FLRW cosmological model with perfect fluid comprising of variable Chaplygin gas has been studied in context of f(R; T) gravity with particle creation. The considered scale factors describe the accelerated expansion of universe due to the effective negative pressure produced during evolution of universe. The role... |
2006.04336 | Pardyumn Kumar Sahoo | Snehasish Bhattacharjee, J.R.L. Santos, P.H.R.S. Moraes, P.K. Sahoo | Inflation in $f(R,T)$ Gravity | EPJ Plus accepted version | Eur. Phys. J. Plus 135, 576 (2020) | 10.1140/epjp/s13360-020-00583-6 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The article presents modeling of inflationary scenarios for the first time in
the $f(R,T)$ theory of gravity. We assume the $f(R,T)$ functional from to be $R
+ \eta T$, where $R$ denotes the Ricci scalar, $T$ the trace of the
energy-momentum tensor and $\eta$ the model parameter (constant). We first
investigated an i... | [
{
"created": "Mon, 8 Jun 2020 03:17:16 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jun 2020 09:59:08 GMT",
"version": "v2"
}
] | 2020-08-03 | [
[
"Bhattacharjee",
"Snehasish",
""
],
[
"Santos",
"J. R. L.",
""
],
[
"Moraes",
"P. H. R. S.",
""
],
[
"Sahoo",
"P. K.",
""
]
] | The article presents modeling of inflationary scenarios for the first time in the $f(R,T)$ theory of gravity. We assume the $f(R,T)$ functional from to be $R + \eta T$, where $R$ denotes the Ricci scalar, $T$ the trace of the energy-momentum tensor and $\eta$ the model parameter (constant). We first investigated an inf... |
1506.08038 | Christian R\"oken | Christian R\"oken | The Massive Dirac Equation in the Kerr Geometry: Separability in
Eddington-Finkelstein-type Coordinates and Asymptotics | 19 pages, 3 figures, details added, reference added, minor
corrections and improvements (published version) | null | 10.1007/s10714-017-2194-y | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The separability of the massive Dirac equation in the non-extreme Kerr
geometry in horizon-penetrating advanced Eddington-Finkelstein-type coordinates
is shown. To this end, the Kerr geometry is described in the Newman-Penrose
formalism by a regular Carter tetrad and the Dirac spinors and matrices are
defined in a ch... | [
{
"created": "Fri, 26 Jun 2015 12:03:45 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Dec 2015 16:04:15 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Jan 2016 14:24:21 GMT",
"version": "v3"
},
{
"created": "Tue, 1 Nov 2016 16:50:05 GMT",
"version": "v4"
},
{
"cre... | 2019-02-21 | [
[
"Röken",
"Christian",
""
]
] | The separability of the massive Dirac equation in the non-extreme Kerr geometry in horizon-penetrating advanced Eddington-Finkelstein-type coordinates is shown. To this end, the Kerr geometry is described in the Newman-Penrose formalism by a regular Carter tetrad and the Dirac spinors and matrices are defined in a chir... |
gr-qc/0311062 | Igor I. Smolyaninov | Igor I. Smolyaninov | Linear and nonlinear optics of surface plasmon toy-models of black holes
and wormholes | 10 pages, 9 figures | Phys.Rev.B69:205417,2004 | 10.1103/PhysRevB.69.205417 | null | gr-qc | null | Experimental and theoretical studies of linear and nonlinear optics of
surface plasmon toy wormholes and black holes have been performed. These models
are based on dielectric microdroplets on the metal surfaces and on nanoholes
drilled in thin metal films. Toy surface plasmon black holes and wormholes are
shown to ex... | [
{
"created": "Wed, 19 Nov 2003 21:23:12 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Smolyaninov",
"Igor I.",
""
]
] | Experimental and theoretical studies of linear and nonlinear optics of surface plasmon toy wormholes and black holes have been performed. These models are based on dielectric microdroplets on the metal surfaces and on nanoholes drilled in thin metal films. Toy surface plasmon black holes and wormholes are shown to exhi... |
1804.06944 | Sebasti\'an N\'ajera Valencia | Sebasti\'an N\'ajera and Roberto A. Sussman | Geometric and physical properties of closed ever expanding dust models | 18 Pages, 6 figures | General Relativity and Gravitation (2018) 50:94 | 10.1007/s10714-018-2414-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Current observations suggest that our Universe is not incompatible with a
small positive spatial curvature that can be associated with rest frames having
a "closed" standard topology. We examine a toy model generalisation of the
$\Lambda$CDM model in the form of ever expanding Lema\^{i}tre-Tolman-Bondi
(LTB) models w... | [
{
"created": "Wed, 18 Apr 2018 23:23:49 GMT",
"version": "v1"
}
] | 2018-07-09 | [
[
"Nájera",
"Sebastián",
""
],
[
"Sussman",
"Roberto A.",
""
]
] | Current observations suggest that our Universe is not incompatible with a small positive spatial curvature that can be associated with rest frames having a "closed" standard topology. We examine a toy model generalisation of the $\Lambda$CDM model in the form of ever expanding Lema\^{i}tre-Tolman-Bondi (LTB) models wit... |
1601.00460 | Narayan Banerjee | Sridip Pal and Narayan Banerjee | Anisotropic models are unitary: A rejuvenation of standard quantum
cosmology | null | Journal of Mathematical Physics (Vol.57, Issue 12) 2016 | 10.1063/1.4972292 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work proves that the folk-lore of the pathology of
non-conservation of probability in quantum anisotropic models is wrong. It is
shown in full generality that all operator ordering can lead to a Hamiltonian
with a self-adjoint extension as long as it is constructed to be a symmetric
operator, thereby maki... | [
{
"created": "Mon, 4 Jan 2016 11:31:28 GMT",
"version": "v1"
}
] | 2016-12-30 | [
[
"Pal",
"Sridip",
""
],
[
"Banerjee",
"Narayan",
""
]
] | The present work proves that the folk-lore of the pathology of non-conservation of probability in quantum anisotropic models is wrong. It is shown in full generality that all operator ordering can lead to a Hamiltonian with a self-adjoint extension as long as it is constructed to be a symmetric operator, thereby making... |
2002.03800 | Daniel Berkowitz | Daniel Berkowitz | New Solutions To The Bianchi VIII Wheeler DeWitt Equation And Leading
Order Solutions For $\Lambda$ $\ne$ 0 And A Primordial Magnetic Field | 11 pages, 6 figures. arXiv admin note: text overlap with
arXiv:1910.11970 | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New non trivial solutions to the Lorentzian-signature symmetry reduced
Bianchi VIII Wheeler DeWitt equation for Hartle Hawking ordering parameters $
\pm 2\sqrt{33} $ are obtained using an Euclidean-signature semi classical
method. Using the aforementioned method we define 'excited' states for the
Bianchi VIII wave fu... | [
{
"created": "Wed, 5 Feb 2020 20:07:11 GMT",
"version": "v1"
}
] | 2020-02-11 | [
[
"Berkowitz",
"Daniel",
""
]
] | New non trivial solutions to the Lorentzian-signature symmetry reduced Bianchi VIII Wheeler DeWitt equation for Hartle Hawking ordering parameters $ \pm 2\sqrt{33} $ are obtained using an Euclidean-signature semi classical method. Using the aforementioned method we define 'excited' states for the Bianchi VIII wave func... |
gr-qc/0608079 | Abel Camacho Mr. | A. Camacho and A. Macias, (Departamento de Fisica, Universidad
Autonoma Metropolitana--Mexico D.F., Mexico) | Deformed dispersion relations and the degree of coherence function | null | Gen.Rel.Grav. 38 (2006) 547-551 | 10.1007/s10714-006-0245-x | null | gr-qc | null | The analysis of the modifications that the presence of a deformed dispersion
relation entails in the roots of the so--called degree of coherence function,
for a beam embodying two different frequencies and moving in a Michelson
interferometer, is carried out. The conditions to be satisfied, in order to
detect this ki... | [
{
"created": "Wed, 16 Aug 2006 16:48:05 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Camacho",
"A.",
""
],
[
"Macias",
"A.",
""
]
] | The analysis of the modifications that the presence of a deformed dispersion relation entails in the roots of the so--called degree of coherence function, for a beam embodying two different frequencies and moving in a Michelson interferometer, is carried out. The conditions to be satisfied, in order to detect this kind... |
1808.00080 | Brian Seymour | Brian C. Seymour and Kent Yagi | Testing General Relativity with Black Hole-Pulsar Binaries | 12 figures, 18 pages, fixed 2 minor typos | Phys. Rev. D 98, 124007 (2018) | 10.1103/PhysRevD.98.124007 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary pulsars allow us to carry out precision tests of gravity and have
placed stringent bounds on a broad class of theories beyond general relativity.
Current and future radio telescopes, such as FAST, SKA, and MeerKAT, may find a
new astrophysical system, a pulsar orbiting around a black hole, which will
provide u... | [
{
"created": "Tue, 31 Jul 2018 21:57:17 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Dec 2018 00:17:12 GMT",
"version": "v2"
},
{
"created": "Sat, 21 Mar 2020 19:16:21 GMT",
"version": "v3"
}
] | 2020-03-24 | [
[
"Seymour",
"Brian C.",
""
],
[
"Yagi",
"Kent",
""
]
] | Binary pulsars allow us to carry out precision tests of gravity and have placed stringent bounds on a broad class of theories beyond general relativity. Current and future radio telescopes, such as FAST, SKA, and MeerKAT, may find a new astrophysical system, a pulsar orbiting around a black hole, which will provide us ... |
2105.04604 | Maxime Van De Moortel | Christoph Kehle, Maxime Van de Moortel | Strong Cosmic Censorship in the presence of matter: the decisive effect
of horizon oscillations on the black hole interior geometry | Final version, to appear in Analysis & PDE | Analysis & PDE 17 (2024) 1501-1592 | 10.2140/apde.2024.17.1501 | null | gr-qc math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the Strong Cosmic Censorship Conjecture in the presence of
matter, we study the Einstein equations coupled with a charged/massive scalar
field with spherically symmetric characteristic data relaxing to a
Reissner-Nordstr\"om event horizon. Contrary to the vacuum case, the relaxation
rate is conjectured t... | [
{
"created": "Mon, 10 May 2021 18:41:30 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Dec 2022 12:00:26 GMT",
"version": "v2"
}
] | 2024-06-26 | [
[
"Kehle",
"Christoph",
""
],
[
"Van de Moortel",
"Maxime",
""
]
] | Motivated by the Strong Cosmic Censorship Conjecture in the presence of matter, we study the Einstein equations coupled with a charged/massive scalar field with spherically symmetric characteristic data relaxing to a Reissner-Nordstr\"om event horizon. Contrary to the vacuum case, the relaxation rate is conjectured to ... |
1610.05281 | Robert Mann | Mozhgan Mir and Robert B. Mann | Charged Rotating AdS Black Holes with Chern-Simons coupling | 41 pages, Latex, 9 figures; references updated | Phys. Rev. D 95, 024005 (2017) | 10.1103/PhysRevD.95.024005 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a perturbative solution for rotating charged black holes in
5-dimensional Einstein-Maxwell-Chern-Simons theory with a negative cosmological
constant. We start from a small undeformed Kerr-AdS solution and use the
electric charge as a perturbative parameter to build up black holes with
equal-magnitude angula... | [
{
"created": "Mon, 17 Oct 2016 19:27:55 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Oct 2016 15:59:06 GMT",
"version": "v2"
}
] | 2017-01-11 | [
[
"Mir",
"Mozhgan",
""
],
[
"Mann",
"Robert B.",
""
]
] | We obtain a perturbative solution for rotating charged black holes in 5-dimensional Einstein-Maxwell-Chern-Simons theory with a negative cosmological constant. We start from a small undeformed Kerr-AdS solution and use the electric charge as a perturbative parameter to build up black holes with equal-magnitude angular ... |
1408.6435 | Jarmo M\"akel\"a Dr. | Jarmo M\"akel\"a | A Model of Inflation | 10 pages, no figures. This paper is based on the results obtained in
arXiv:1301.0009 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a novel model of cosmic inflation. In our model one does not need
any specific matter field to drive inflation, but inflation stems from the
microscopic, Planck scale structure of spacetime, thus being of quantum
gravitational origin. At a certain temperature spacetime performs a phase
transition, where t... | [
{
"created": "Tue, 26 Aug 2014 12:17:04 GMT",
"version": "v1"
}
] | 2014-08-28 | [
[
"Mäkelä",
"Jarmo",
""
]
] | We consider a novel model of cosmic inflation. In our model one does not need any specific matter field to drive inflation, but inflation stems from the microscopic, Planck scale structure of spacetime, thus being of quantum gravitational origin. At a certain temperature spacetime performs a phase transition, where the... |
2005.04443 | Alessandro Fabbri | Alessandro Fabbri and Roberto Balbinot | Ramp-up of Hawking radiation in Bose-Einstein condensate analogue black
holes | 6 pages, 5 figures; final version | Phys. Rev. Lett. 126, 111301 (2021) | 10.1103/PhysRevLett.126.111301 | null | gr-qc cond-mat.quant-gas hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by a recent experiment by Steinhauer and co-workers, we present a
simple model which describes the formation of an acoustic black hole in a
Bose-Einstein condensate, allowing an analytical computation of the evolution
in time of the corresponding density-density correlator. We show the emergence
of analog Ha... | [
{
"created": "Sat, 9 May 2020 13:33:49 GMT",
"version": "v1"
},
{
"created": "Tue, 19 May 2020 16:12:06 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Mar 2021 17:28:50 GMT",
"version": "v3"
}
] | 2021-03-19 | [
[
"Fabbri",
"Alessandro",
""
],
[
"Balbinot",
"Roberto",
""
]
] | Inspired by a recent experiment by Steinhauer and co-workers, we present a simple model which describes the formation of an acoustic black hole in a Bose-Einstein condensate, allowing an analytical computation of the evolution in time of the corresponding density-density correlator. We show the emergence of analog Hawk... |
gr-qc/0502049 | Yavuz Nutku | Y. Nutku | Electrovac $pp$-waves | null | Class.Quant.Grav. 22 (2005) L43-L46 | 10.1088/0264-9381/22/9/L01 | null | gr-qc | null | New exact solutions of the Einstein-Maxwell field equations that describe
$pp$-waves are presented.
| [
{
"created": "Thu, 10 Feb 2005 20:17:40 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Feb 2005 09:02:16 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Nutku",
"Y.",
""
]
] | New exact solutions of the Einstein-Maxwell field equations that describe $pp$-waves are presented. |
gr-qc/0512050 | Bijan Saha | Bijan Saha | Spinor field and accelerated regimes in cosmology | 7 pages, 4 figures | Grav.Cosmol.12 (2006) 215 - 218 | null | null | gr-qc | null | A self-consistent system of interaction nonlinear spinor and scalar fields
within the scope of a BI cosmological model filled with perfect fluid is
considered. The role of spinor field in the evolution of the Universe is
studied. It is shown that the spinor field nonlinearity can generate a negative
effective pressur... | [
{
"created": "Thu, 8 Dec 2005 13:12:22 GMT",
"version": "v1"
}
] | 2015-05-01 | [
[
"Saha",
"Bijan",
""
]
] | A self-consistent system of interaction nonlinear spinor and scalar fields within the scope of a BI cosmological model filled with perfect fluid is considered. The role of spinor field in the evolution of the Universe is studied. It is shown that the spinor field nonlinearity can generate a negative effective pressure,... |
gr-qc/9601021 | Alberto Saa | Alberto Saa | New no-scalar-hair theorem for black-holes | Revtex, 12 pages | J.Math.Phys. 37 (1996) 2346-2351 | 10.1063/1.531513 | US-FT/2-96 | gr-qc | null | A new no-hair theorem is formulated which rules out a very large class of
non-minimally coupled finite scalar dressing of an asymptotically flat, static,
and spherically symmetric black-hole. The proof is very simple and based in a
covariant method for generating solutions for non-minimally coupled scalar
fields star... | [
{
"created": "Mon, 15 Jan 1996 14:29:30 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Saa",
"Alberto",
""
]
] | A new no-hair theorem is formulated which rules out a very large class of non-minimally coupled finite scalar dressing of an asymptotically flat, static, and spherically symmetric black-hole. The proof is very simple and based in a covariant method for generating solutions for non-minimally coupled scalar fields starti... |
2209.11298 | James Kennington | Chad Hanna, James Kennington, Shio Sakon, Stephen Privitera, Miguel
Fernandez, Jonathan Wang, Cody Messick, Alex Pace, Kipp Cannon, Prathamesh
Joshi, Rachael Huxford, Sarah Caudill, Chiwai Chan, Bryce Cousins, Jolien D.
E. Creighton, Becca Ewing, Heather Fong, Patrick Godwin, Ryan Magee, Duncan
Meacher, Soichir... | A binary tree approach to template placement for searches for
gravitational waves from compact binary mergers | null | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate a new geometric method for fast template placement for
searches for gravitational waves from the inspiral, merger and ringdown of
compact binaries. The method is based on a binary tree decomposition of the
template bank parameter space into non-overlapping hypercubes. We use a
numerical approximation o... | [
{
"created": "Thu, 22 Sep 2022 20:25:23 GMT",
"version": "v1"
}
] | 2022-09-26 | [
[
"Hanna",
"Chad",
""
],
[
"Kennington",
"James",
""
],
[
"Sakon",
"Shio",
""
],
[
"Privitera",
"Stephen",
""
],
[
"Fernandez",
"Miguel",
""
],
[
"Wang",
"Jonathan",
""
],
[
"Messick",
"Cody",
""
],
[
... | We demonstrate a new geometric method for fast template placement for searches for gravitational waves from the inspiral, merger and ringdown of compact binaries. The method is based on a binary tree decomposition of the template bank parameter space into non-overlapping hypercubes. We use a numerical approximation of ... |
gr-qc/9803006 | Grigorii A. Vilkovisky | A. G. Mirzabekian, G. A. Vilkovisky (Lebedev Institute) | Particle creation in the effective action method | 129 pages including 7 figures. Latex 2.09. Figures by METAFONT, 300
DPI. Execute the file "arttotal.tex" | Ann.Phys.270:391-496,1998 | 10.1006/aphy.1998.5860 | null | gr-qc hep-th | null | The effect of particle creation by nonstationary external fields is
considered as a radiation effect in the expectation-value spacetime. The energy
of created massless particles is calculated as the vacuum contribution in the
energy-momentum tensor of the expectation value of the metric. The calculation
is carried ou... | [
{
"created": "Mon, 2 Mar 1998 03:37:20 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mirzabekian",
"A. G.",
"",
"Lebedev Institute"
],
[
"Vilkovisky",
"G. A.",
"",
"Lebedev Institute"
]
] | The effect of particle creation by nonstationary external fields is considered as a radiation effect in the expectation-value spacetime. The energy of created massless particles is calculated as the vacuum contribution in the energy-momentum tensor of the expectation value of the metric. The calculation is carried out ... |
0709.2129 | Kevin Vandersloot | Christian G. Boehmer, Kevin Vandersloot | Loop Quantum Dynamics of the Schwarzschild Interior | Update to match version accepted for publication in PRD | Phys.Rev.D76:104030,2007 | 10.1103/PhysRevD.76.104030 | null | gr-qc astro-ph math-ph math.MP | null | We examine the Schwarzschild interior of a black hole, incorporating quantum
gravitational modifications due to loop quantum gravity. We consider an
improved loop quantization using techniques that have proven successful in loop
quantum cosmology. The central Schwarzschild singularity is resolved and the
implications... | [
{
"created": "Thu, 13 Sep 2007 17:10:18 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Oct 2007 10:07:45 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Boehmer",
"Christian G.",
""
],
[
"Vandersloot",
"Kevin",
""
]
] | We examine the Schwarzschild interior of a black hole, incorporating quantum gravitational modifications due to loop quantum gravity. We consider an improved loop quantization using techniques that have proven successful in loop quantum cosmology. The central Schwarzschild singularity is resolved and the implications f... |
gr-qc/0511151 | Norichika Sago | Norichika Sago, Takahiro Tanaka, Wataru Hikida, Katsuhiko Ganz,
Hiroyuki Nakano | The adiabatic evolution of orbital parameters in the Kerr spacetime | 34 pages, no figure | Prog.Theor.Phys. 115 (2006) 873-907 | 10.1143/PTP.115.873 | null | gr-qc astro-ph | null | We investigate the adiabatic orbital evolution of a point particle in the
Kerr spacetime due to the emission of gravitational waves. In the case that the
timescale of the orbital evolution is enough smaller than the typical timescale
of orbits, the evolution of orbits is characterized by the change rates of
three con... | [
{
"created": "Tue, 29 Nov 2005 08:48:26 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Sago",
"Norichika",
""
],
[
"Tanaka",
"Takahiro",
""
],
[
"Hikida",
"Wataru",
""
],
[
"Ganz",
"Katsuhiko",
""
],
[
"Nakano",
"Hiroyuki",
""
]
] | We investigate the adiabatic orbital evolution of a point particle in the Kerr spacetime due to the emission of gravitational waves. In the case that the timescale of the orbital evolution is enough smaller than the typical timescale of orbits, the evolution of orbits is characterized by the change rates of three const... |
1009.1794 | Luca Lusanna | David Alba and Luca Lusanna | The Einstein-Maxwell-Particle System in the York Canonical Basis of ADM
Tetrad Gravity: III) The Post-Minkowskian N-Body Problem, its Post-Newtonian
Limit in Non-Harmonic 3-Orthogonal Gauges and Dark Matter as an Inertial
Effect | 86 pages. Deep revision of the second part of the paper with the
addition of the center-of-mass problem in GR, with a refined treatment of the
PostNewtonian expansion and with the explaination of dark matter as a
relativistic inertial effect not only in the rotation curves of galaxies but
also in the mass of ga... | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We conclude the study of the Post-Minkowskian linearization of ADM tetrad
gravity in the York canonical basis for asymptotically Minkowskian space-times
in the family of non-harmonic 3-orthogonal gauges parametrized by the York time
${}^3K(\tau, \vec \sigma)$ (the inertial gauge variable, not existing in Newton
gravi... | [
{
"created": "Thu, 9 Sep 2010 14:28:24 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2011 13:11:24 GMT",
"version": "v2"
}
] | 2011-04-27 | [
[
"Alba",
"David",
""
],
[
"Lusanna",
"Luca",
""
]
] | We conclude the study of the Post-Minkowskian linearization of ADM tetrad gravity in the York canonical basis for asymptotically Minkowskian space-times in the family of non-harmonic 3-orthogonal gauges parametrized by the York time ${}^3K(\tau, \vec \sigma)$ (the inertial gauge variable, not existing in Newton gravity... |
2207.08864 | Jacopo Mazza | Edgardo Franzin, Stefano Liberati, Jacopo Mazza, Vania Vellucci | Stable Rotating Regular Black Holes | 15 pages, 8 figures. (v2) Formatting matched to submitted version.
(v3) Sec. V.A on causal structure added, sec. V.B on effective matter content
expanded, other minor revisions; matches published version | Phys. Rev. D 106, 104060 (2022) | 10.1103/PhysRevD.106.104060 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a rotating regular black hole whose inner horizon has zero surface
gravity for any value of the spin parameter, and is therefore stable against
mass inflation. Our metric is built by combining two successful strategies for
regularizing singularities, i.e. by replacing the mass parameter with a
function of ... | [
{
"created": "Mon, 18 Jul 2022 18:22:16 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jul 2022 16:27:53 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Dec 2022 17:01:27 GMT",
"version": "v3"
}
] | 2024-03-08 | [
[
"Franzin",
"Edgardo",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Mazza",
"Jacopo",
""
],
[
"Vellucci",
"Vania",
""
]
] | We present a rotating regular black hole whose inner horizon has zero surface gravity for any value of the spin parameter, and is therefore stable against mass inflation. Our metric is built by combining two successful strategies for regularizing singularities, i.e. by replacing the mass parameter with a function of $r... |
1603.03436 | Cristian Martinez | Hideki Maeda and Cristian Martinez | All static and electrically charged solutions with Einstein base
manifold in the arbitrary-dimensional Einstein-Maxwell system with a massless
scalar field | 38 pages, 1 figure, 1 table. Some typos fixed. References added | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a simple and complete classification of static solutions in the
Einstein-Maxwell system with a massless scalar field in arbitrary $n(\ge 3)$
dimensions. We consider spacetimes which correspond to a warped product $M^2
\times K^{n-2}$, where $K^{n-2}$ is a $(n-2)$-dimensional Einstein space. The
scalar fiel... | [
{
"created": "Thu, 10 Mar 2016 21:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Apr 2018 14:39:08 GMT",
"version": "v2"
},
{
"created": "Mon, 6 Aug 2018 15:38:05 GMT",
"version": "v3"
}
] | 2018-08-07 | [
[
"Maeda",
"Hideki",
""
],
[
"Martinez",
"Cristian",
""
]
] | We present a simple and complete classification of static solutions in the Einstein-Maxwell system with a massless scalar field in arbitrary $n(\ge 3)$ dimensions. We consider spacetimes which correspond to a warped product $M^2 \times K^{n-2}$, where $K^{n-2}$ is a $(n-2)$-dimensional Einstein space. The scalar field ... |
2402.15922 | Everton Murilo Carvalho Abreu | Everton M. C. Abreu | Barrow black hole variable parameter model connected to information
theory | 9 pages | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | One of the greatest challenges of theoretical physics today is to unveil the
quantum information theory concerning what happens when one bit of information
enters the black hole (BH) horizon. The Landauer principle showed that a
certain amount of energy is generated when one-bit of information is erased as
it enters ... | [
{
"created": "Sat, 24 Feb 2024 22:33:08 GMT",
"version": "v1"
}
] | 2024-02-27 | [
[
"Abreu",
"Everton M. C.",
""
]
] | One of the greatest challenges of theoretical physics today is to unveil the quantum information theory concerning what happens when one bit of information enters the black hole (BH) horizon. The Landauer principle showed that a certain amount of energy is generated when one-bit of information is erased as it enters th... |
2211.08925 | Macarena Lagos | Felipe Sulantay, Macarena Lagos, M\'aximo Ba\~nados | Chiral Gravitational Waves in Palatini Chern-Simons | Published version | null | 10.1103/PhysRevD.107.104025 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the parity-breaking higher-curvature gravity theory of Chern-Simons
(CS), using the Palatini formulation in which the metric and connection are
taken to be independent fields. We first show that Palatini CS gravity leads to
first-order derivative equations of motion and thus avoid the typical
instabilities o... | [
{
"created": "Wed, 16 Nov 2022 14:12:30 GMT",
"version": "v1"
},
{
"created": "Fri, 19 May 2023 18:20:18 GMT",
"version": "v2"
}
] | 2023-05-23 | [
[
"Sulantay",
"Felipe",
""
],
[
"Lagos",
"Macarena",
""
],
[
"Bañados",
"Máximo",
""
]
] | We study the parity-breaking higher-curvature gravity theory of Chern-Simons (CS), using the Palatini formulation in which the metric and connection are taken to be independent fields. We first show that Palatini CS gravity leads to first-order derivative equations of motion and thus avoid the typical instabilities of ... |
2311.14052 | Luca D'Onofrio | Luca D'Onofrio, Rosario De Rosa, Paola Leaci, Cristiano Palomba | Doppler orbital correction for the targeted search of known pulsars with
the 5-vector method | arXiv admin note: substantial text overlap with arXiv:2311.08229 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Pulsars are promising targets for the first detection of continuous
gravitational waves (CWs) by the LIGO-Virgo-KAGRA (LVK) Collaboration. Targeted
searches leverage critical information derived from continued monitoring of
pulsars related to the spin evolution, astrometry, and binary orbit. This
information maximize... | [
{
"created": "Thu, 23 Nov 2023 15:10:01 GMT",
"version": "v1"
}
] | 2023-11-27 | [
[
"D'Onofrio",
"Luca",
""
],
[
"De Rosa",
"Rosario",
""
],
[
"Leaci",
"Paola",
""
],
[
"Palomba",
"Cristiano",
""
]
] | Pulsars are promising targets for the first detection of continuous gravitational waves (CWs) by the LIGO-Virgo-KAGRA (LVK) Collaboration. Targeted searches leverage critical information derived from continued monitoring of pulsars related to the spin evolution, astrometry, and binary orbit. This information maximizes ... |
2308.07363 | Ignacio A. Reyes | Ignacio A. Reyes | Trace anomaly and compact stars | 6 pages, 1 figure. Minor modifications: added comment on the equation
of state, shortened the section on the wave equation | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A widespread assumption states that quantum effects of matter in curved
spacetimes become relevant only when the inverse curvature radius approaches
the Planck mass $m_{\text{P}}$. We challenge this view by showing that, relying
solely on universal properties of QFTs at high energies, the trace anomaly
becomes macros... | [
{
"created": "Mon, 14 Aug 2023 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2023 17:44:02 GMT",
"version": "v2"
}
] | 2023-09-12 | [
[
"Reyes",
"Ignacio A.",
""
]
] | A widespread assumption states that quantum effects of matter in curved spacetimes become relevant only when the inverse curvature radius approaches the Planck mass $m_{\text{P}}$. We challenge this view by showing that, relying solely on universal properties of QFTs at high energies, the trace anomaly becomes macrosco... |
1410.2301 | Hristu Culetu | Hristu Culetu | Negative $\Lambda$ induced by accelerated motion | title changed, 6 pages, version published in EPJ Plus 130 (4), 2015;
DOI 10.1140/epjp/i2015-15065-9 | EPJ Plus (2015) 130 (4) | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A correlation between accelerated motion and a noncompact 5th dimension is
proposed. The curvature invariants and the stress energy tensor in the bulk
depend only on the 5th dimension $w$ and vanish asymptotically while the proper
acceleration of a static observer is proportional to $1/w$. The brane (located
at $w = ... | [
{
"created": "Wed, 8 Oct 2014 22:20:13 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Apr 2015 15:28:57 GMT",
"version": "v2"
}
] | 2015-04-17 | [
[
"Culetu",
"Hristu",
""
]
] | A correlation between accelerated motion and a noncompact 5th dimension is proposed. The curvature invariants and the stress energy tensor in the bulk depend only on the 5th dimension $w$ and vanish asymptotically while the proper acceleration of a static observer is proportional to $1/w$. The brane (located at $w = w_... |
1610.01968 | Lee Smolin | Lee Smolin | Four principles for quantum gravity | 26 pages, one figure and caption taken from McGaugh, Lelli,
Schombert, arXiv:1609.05917v1 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Four principles are proposed to underlie the quantum theory of gravity. We
show that these suffice to recover the Einstein equations. We also suggest that
MOND results from a modification of the classical equivalence principle, due to
quantum gravity effects.
| [
{
"created": "Thu, 6 Oct 2016 17:46:33 GMT",
"version": "v1"
}
] | 2016-10-07 | [
[
"Smolin",
"Lee",
""
]
] | Four principles are proposed to underlie the quantum theory of gravity. We show that these suffice to recover the Einstein equations. We also suggest that MOND results from a modification of the classical equivalence principle, due to quantum gravity effects. |
1007.1031 | Frank Wilczek | Achilleas P. Porfyriadis and Frank Wilczek | Effective Action, Boundary Conditions, and Virasoro Algebra for AdS$_3$ | 12 pages, no figures | null | null | MIT-CTP/4160 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct, to second order, the effective action of General Relativity for
small excitations generated by a vector field and use it to study conformal
symmetry in the boundary of AdS$_3$. By requiring finiteness of the boundary
effective action(s) for certain asymptotic transformations, we derive the
well-known Vi... | [
{
"created": "Wed, 7 Jul 2010 01:08:56 GMT",
"version": "v1"
}
] | 2010-07-08 | [
[
"Porfyriadis",
"Achilleas P.",
""
],
[
"Wilczek",
"Frank",
""
]
] | We construct, to second order, the effective action of General Relativity for small excitations generated by a vector field and use it to study conformal symmetry in the boundary of AdS$_3$. By requiring finiteness of the boundary effective action(s) for certain asymptotic transformations, we derive the well-known Vira... |
1109.4400 | Andrea Nerozzi | Andrea Nerozzi | A new approach to the Newman-Penrose formalism | 5 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Newman-Penrose formalism in transverse tetrads, namely those tetrads
where \Psi_1=\Psi_3=0, is studied. In particular it is shown that the equations
governing the dynamics within this formalism can be recast in a particularly
compact way, leading to a better understanding of the formalism itself. The
particular c... | [
{
"created": "Tue, 20 Sep 2011 19:26:30 GMT",
"version": "v1"
}
] | 2011-09-21 | [
[
"Nerozzi",
"Andrea",
""
]
] | The Newman-Penrose formalism in transverse tetrads, namely those tetrads where \Psi_1=\Psi_3=0, is studied. In particular it is shown that the equations governing the dynamics within this formalism can be recast in a particularly compact way, leading to a better understanding of the formalism itself. The particular cho... |
1503.03370 | Aghil Alaee | Aghil Alaee, Hari K. Kunduri | Proof of the local mass-angular momenta inequality for $U(1)^2$
invariant black holes | v2. statement of main theorem clarified, various minor improvements
and clarifications | Class.Quant.Grav. 32 (2015) 16, 165020 | 10.1088/0264-9381/32/16/165020 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider initial data for extreme vacuum asymptotically flat black holes
with $\mathbb{R} \times U(1)^2$ symmetry. Such geometries are critical points
of a mass functional defined for a wide class of asymptotically flat,
`$(t-\phi^i)$' symmetric maximal initial data for the vacuum Einstein
equations. We prove that... | [
{
"created": "Wed, 11 Mar 2015 15:16:43 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Aug 2015 15:16:31 GMT",
"version": "v2"
}
] | 2015-08-13 | [
[
"Alaee",
"Aghil",
""
],
[
"Kunduri",
"Hari K.",
""
]
] | We consider initial data for extreme vacuum asymptotically flat black holes with $\mathbb{R} \times U(1)^2$ symmetry. Such geometries are critical points of a mass functional defined for a wide class of asymptotically flat, `$(t-\phi^i)$' symmetric maximal initial data for the vacuum Einstein equations. We prove that t... |
gr-qc/0007052 | Moncy John | Moncy V. John and K. Babu Joseph | A Low Matter Density Decaying Vacuum Cosmology from Complex Metric | 21 pages, no figures | Class.Quant.Grav.14:1115,1997 | 10.1088/0264-9381/14/5/016 | null | gr-qc astro-ph hep-th | null | A low matter density decaying vacuum cosmology is proposed on the assumption
that the universe's radius is a complex quantity \hat{R} if it is regarded as
having a zero energy-momentum tensor. But we find that when the radius is real,
it contains matter. Using the Einstein-Hilbert action principle, the physical
scale... | [
{
"created": "Thu, 20 Jul 2000 17:09:30 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"John",
"Moncy V.",
""
],
[
"Joseph",
"K. Babu",
""
]
] | A low matter density decaying vacuum cosmology is proposed on the assumption that the universe's radius is a complex quantity \hat{R} if it is regarded as having a zero energy-momentum tensor. But we find that when the radius is real, it contains matter. Using the Einstein-Hilbert action principle, the physical scale f... |
1007.2024 | David Nichols | David A. Nichols and Yanbei Chen | A hybrid method for understanding black-hole mergers: head-on case | 14 pages, 6 figures, 1 table, revtex4 format, v2 references added, v3
expanded discussion of comparison with numerical relativity, and small
changes to match published version | Phys.Rev.D82:104020,2010 | 10.1103/PhysRevD.82.104020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black-hole-binary coalescence is often divided into three stages: inspiral,
merger and ringdown. The post-Newtonian (PN) approximation treats the inspiral
phase, black-hole perturbation (BHP) theory describes the ringdown, and the
nonlinear dynamics of spacetime characterize the merger. In this paper, we
introduce a ... | [
{
"created": "Tue, 13 Jul 2010 02:34:30 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jul 2010 06:12:52 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Nov 2010 22:53:19 GMT",
"version": "v3"
}
] | 2010-12-13 | [
[
"Nichols",
"David A.",
""
],
[
"Chen",
"Yanbei",
""
]
] | Black-hole-binary coalescence is often divided into three stages: inspiral, merger and ringdown. The post-Newtonian (PN) approximation treats the inspiral phase, black-hole perturbation (BHP) theory describes the ringdown, and the nonlinear dynamics of spacetime characterize the merger. In this paper, we introduce a hy... |
gr-qc/9803081 | Justino Martinez | L. Herrera, A. Di Prisco and J. Martinez | Breakdown of the linear approximation in the perturbative analysis of
heat conduction in relativistic systems | 11 pages (Latex2.09) To appear in Physics Letters A | Phys.Lett.A243:7-12,1998 | 10.1016/S0375-9601(98)00222-9 | null | gr-qc astro-ph | null | We analyze the effects of thermal conduction in a relativistic fluid just
after its departure from spherical symmetry, on a time scale of the order of
relaxation time. Using first order perturbation theory, it is shown that, as in
spherical systems, at a critical point the effective inertial mass density of a
fluid e... | [
{
"created": "Wed, 25 Mar 1998 08:05:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Herrera",
"L.",
""
],
[
"Di Prisco",
"A.",
""
],
[
"Martinez",
"J.",
""
]
] | We analyze the effects of thermal conduction in a relativistic fluid just after its departure from spherical symmetry, on a time scale of the order of relaxation time. Using first order perturbation theory, it is shown that, as in spherical systems, at a critical point the effective inertial mass density of a fluid ele... |
2204.04519 | Junji Jia | Haotian Liu, Jinning Liang and Junji Jia | Deflection and Gravitational lensing of null and timelike signals in the
Kiselev black hole spacetime in the weak field limit | 19 pages, 7 figures; to match the version to appear in Classical and
Quantum Gravity | null | 10.1088/1361-6382/ac8b56 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the deflection and gravitational lensing of null and
timelike signals in the Kiselev spacetime in the weak field limit, to
investigate the effects of the equation of state parameter $\omega$ and the
matter amount parameter $\alpha$. In doing this, we extend a perturbative
method previously devel... | [
{
"created": "Sat, 9 Apr 2022 17:50:22 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Aug 2022 15:12:42 GMT",
"version": "v2"
}
] | 2022-09-21 | [
[
"Liu",
"Haotian",
""
],
[
"Liang",
"Jinning",
""
],
[
"Jia",
"Junji",
""
]
] | In this work we study the deflection and gravitational lensing of null and timelike signals in the Kiselev spacetime in the weak field limit, to investigate the effects of the equation of state parameter $\omega$ and the matter amount parameter $\alpha$. In doing this, we extend a perturbative method previously develop... |
gr-qc/0212065 | Kirill Bronnikov | K.A. Bronnikov, S.B. Fadeev and A.V. Michtchenko | Scalar fields in multidimensional gravity. No-hair and other no-go
theorems | 10 pages, Latex-2e. Submitted to Gen. Rel. Grav | Gen.Rel.Grav. 35 (2003) 505-525 | 10.1023/A:1022952314050 | null | gr-qc hep-th | null | Global properties of static, spherically symmetric configurations of scalar
fields of sigma-model type with arbitrary potentials are studied in $D$
dimensions, including space-times containing multiple internal factor spaces.
The latter are assumed to be Einstein spaces, not necessarily Ricci-flat, and
the potential ... | [
{
"created": "Sun, 15 Dec 2002 17:44:51 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Fadeev",
"S. B.",
""
],
[
"Michtchenko",
"A. V.",
""
]
] | Global properties of static, spherically symmetric configurations of scalar fields of sigma-model type with arbitrary potentials are studied in $D$ dimensions, including space-times containing multiple internal factor spaces. The latter are assumed to be Einstein spaces, not necessarily Ricci-flat, and the potential $V... |
1906.08288 | Ashoke Sen | Alok Laddha and Ashoke Sen | A Classical Proof of the Classical Soft Graviton Theorem in D>4 | LaTeX; 32 pages | Phys. Rev. D 101, 084011 (2020) | 10.1103/PhysRevD.101.084011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Classical soft graviton theorem gives an expression for the spectrum of low
frequency gravitational radiation, emitted during a classical scattering
process, in terms of the trajectories and spin angular momenta of ingoing and
outgoing objects, including hard radiation. This has been proved to subleading
order in the... | [
{
"created": "Wed, 19 Jun 2019 18:14:17 GMT",
"version": "v1"
}
] | 2020-04-15 | [
[
"Laddha",
"Alok",
""
],
[
"Sen",
"Ashoke",
""
]
] | Classical soft graviton theorem gives an expression for the spectrum of low frequency gravitational radiation, emitted during a classical scattering process, in terms of the trajectories and spin angular momenta of ingoing and outgoing objects, including hard radiation. This has been proved to subleading order in the e... |
0910.0490 | Bennie F. L. Ward | B.F.L. Ward (Department of Physics, Baylor University, Waco, TX, USA) | Planck Scale Cosmology and Resummed Quantum Gravity | 6 pages, 2 figures. To be published in the proceedings of DPF-2009,
Detroit, MI, July 2009, eConf C090726; 3 typo's corrected | null | null | BU-HEPP-09-05 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, by using amplitude-based resummation techniques for Feynman's
formulation of Einstein's theory, we get quantum field theoretic 'first
principles' predictions for the UV fixed-point values of the dimensionless
gravitational and cosmological constants. Connections to the phenomenological
asymptotic safety... | [
{
"created": "Fri, 2 Oct 2009 21:25:20 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Oct 2009 19:48:31 GMT",
"version": "v2"
}
] | 2009-10-13 | [
[
"Ward",
"B. F. L.",
"",
"Department of Physics, Baylor University, Waco, TX, USA"
]
] | We show that, by using amplitude-based resummation techniques for Feynman's formulation of Einstein's theory, we get quantum field theoretic 'first principles' predictions for the UV fixed-point values of the dimensionless gravitational and cosmological constants. Connections to the phenomenological asymptotic safety a... |
2401.06931 | Jan Ambjorn | Jan Ambjorn and Yoshiyuki Watabiki | Late time acceleration of our Universe caused by the absorption of baby
universes | Contribution to the proceedings volume for Gravity, Strings and
Fields: A conference in honour of Gordon Semenoff | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If our Universe is allowed to absorb baby universes, one obtains a modified
Friedmann equation that can explain the late time acceleration of our Universe
and there is no need for a cosmological constant. In addition the modified
Friedmann equation favors the value of the Hubble constant obtained by local
measurement... | [
{
"created": "Fri, 12 Jan 2024 23:47:06 GMT",
"version": "v1"
}
] | 2024-01-17 | [
[
"Ambjorn",
"Jan",
""
],
[
"Watabiki",
"Yoshiyuki",
""
]
] | If our Universe is allowed to absorb baby universes, one obtains a modified Friedmann equation that can explain the late time acceleration of our Universe and there is no need for a cosmological constant. In addition the modified Friedmann equation favors the value of the Hubble constant obtained by local measurements. |
2210.15640 | D. Ghilencea | Dumitru Ghilencea, Christopher T. Hill | Renormalization Group for Non-minimal $\phi^2 R$ Couplings and
Gravitational Contact Interactions | 11 pages, 4 figures. arXiv admin note: text overlap with
arXiv:2009.14782 | null | 10.1103/PhysRevD.107.085013 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theories of scalars and gravity, with an Einstein-Hilbert term and
non-minimal interactions, $M^2R/2 -\alpha\phi^2R/12 $, have graviton exchange
induced contact interactions. These modify the renormalization group, leading
to a discrepancy between the conventional calculations in the Jordan frame that
ignore this eff... | [
{
"created": "Thu, 27 Oct 2022 17:31:11 GMT",
"version": "v1"
}
] | 2023-05-03 | [
[
"Ghilencea",
"Dumitru",
""
],
[
"Hill",
"Christopher T.",
""
]
] | Theories of scalars and gravity, with an Einstein-Hilbert term and non-minimal interactions, $M^2R/2 -\alpha\phi^2R/12 $, have graviton exchange induced contact interactions. These modify the renormalization group, leading to a discrepancy between the conventional calculations in the Jordan frame that ignore this effec... |
gr-qc/0306095 | Jorge Pullin | Rodolfo Gambini, Jorge Pullin | Discrete quantum gravity: a mechanism for selecting the value of
fundamental constants | 5 pages, RevTex, 4 figures, honorable mention in the 2003 Gravity
Research Foundation Essays, to appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D12 (2003) 1775-1782 | 10.1142/S0218271803004018 | LSU-REL-062003 | gr-qc astro-ph hep-th | null | Smolin has put forward the proposal that the universe fine tunes the values
of its physical constants through a Darwinian selection process. Every time a
black hole forms, a new universe is developed inside it that has different
values for its physical constants from the ones in its progenitor. The most
likely univer... | [
{
"created": "Fri, 20 Jun 2003 18:49:24 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
]
] | Smolin has put forward the proposal that the universe fine tunes the values of its physical constants through a Darwinian selection process. Every time a black hole forms, a new universe is developed inside it that has different values for its physical constants from the ones in its progenitor. The most likely universe... |
1003.3782 | Branislav Cvetkovi\'c | M. Blagojevi\'c and B. Cvetkovi\'c | Conserved charges in 3D gravity | LATEX, 14 pages; v2: minor corrections, two references added | Phys.Rev.D81:124024,2010 | 10.1103/PhysRevD.81.124024 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The covariant canonical expression for the conserved charges, proposed by
Nester, is tested on several solutions in 3D gravity with or without torsion
and topologically massive gravity. In each of these cases, the calculated
values of energy-momentum and angular momentum are found to satisfy the first
law of black ho... | [
{
"created": "Fri, 19 Mar 2010 12:07:12 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jun 2010 08:09:41 GMT",
"version": "v2"
}
] | 2010-06-11 | [
[
"Blagojević",
"M.",
""
],
[
"Cvetković",
"B.",
""
]
] | The covariant canonical expression for the conserved charges, proposed by Nester, is tested on several solutions in 3D gravity with or without torsion and topologically massive gravity. In each of these cases, the calculated values of energy-momentum and angular momentum are found to satisfy the first law of black hole... |
2303.18074 | Silvia Pla Garc\'ia | Antonio Ferreiro and Silvia Pla | Instantaneous vacuum and States of Low Energy for a scalar field in
cosmological backgrounds | 10 pages, 4 figures, contribution to the proceedings of the "Avenues
of Quantum Field Theory in Curved Space-time" conference, Genova, September
2022 | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We construct the instantaneous vacuum state for a quantum scalar field
coupled to another classical scalar field as described in [1]. We then compare
it with the state of low energy constructed for a particular solution. We show
that under physically motivated conditions they become very similar.
| [
{
"created": "Fri, 31 Mar 2023 14:06:09 GMT",
"version": "v1"
}
] | 2023-04-03 | [
[
"Ferreiro",
"Antonio",
""
],
[
"Pla",
"Silvia",
""
]
] | We construct the instantaneous vacuum state for a quantum scalar field coupled to another classical scalar field as described in [1]. We then compare it with the state of low energy constructed for a particular solution. We show that under physically motivated conditions they become very similar. |
1205.1096 | Ahmet Baykal | Ahmet Baykal | Quadratic Curvature Gravity with Second Order Trace and Massive Gravity
Models in Three Dimensions | 24 pages, to appear in GRG | Gen.Rel.Grav. 44 (2012) 1993-2017 | 10.1007/s10714-012-1377-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quadratic curvature lagrangians having metric field equations with second
order trace are constructed relative to an orthonormal coframe. In $n>4$
dimensions, pure quadratic curvature lagrangian having second order trace
constructed contains three free parameters in the most general case. The fourth
order field e... | [
{
"created": "Sat, 5 May 2012 03:59:30 GMT",
"version": "v1"
}
] | 2012-07-17 | [
[
"Baykal",
"Ahmet",
""
]
] | The quadratic curvature lagrangians having metric field equations with second order trace are constructed relative to an orthonormal coframe. In $n>4$ dimensions, pure quadratic curvature lagrangian having second order trace constructed contains three free parameters in the most general case. The fourth order field equ... |
1701.00564 | Tetsuya Shiromizu | Tetsuya Shiromizu, Yoshimune Tomikawa, Keisuke Izumi and Hirotaka
Yoshino | Area bound for a surface in a strong gravity region | 5 pages, a reference added, minor changes, accepted for publication
in PTEP | Prog. Theor. Exp. Phys. (2017) 033E01 | 10.1093/ptep/ptx022 | OCU-PHYS-456; AP-GR-135 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For asymptotically flat spacetimes, using the inverse mean curvature flow, we
show that any compact $2$-surface, $S_0$, whose mean curvature and its
derivative for outward direction are positive in spacelike hypersurface with
non-negative Ricci scalar satisfies the inequality $A_0 \leq 4 \pi (3Gm)^2$,
where $A_0$ is ... | [
{
"created": "Tue, 3 Jan 2017 01:25:54 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Feb 2017 06:04:42 GMT",
"version": "v2"
}
] | 2017-04-19 | [
[
"Shiromizu",
"Tetsuya",
""
],
[
"Tomikawa",
"Yoshimune",
""
],
[
"Izumi",
"Keisuke",
""
],
[
"Yoshino",
"Hirotaka",
""
]
] | For asymptotically flat spacetimes, using the inverse mean curvature flow, we show that any compact $2$-surface, $S_0$, whose mean curvature and its derivative for outward direction are positive in spacelike hypersurface with non-negative Ricci scalar satisfies the inequality $A_0 \leq 4 \pi (3Gm)^2$, where $A_0$ is th... |
1402.1437 | Bernard J. Carr | B. J. Carr | Primordial Black Holes and Quantum Effects | 8 pages, 6 figures, to appear in Proceedings of 2013 Karl
Schwarzschild Meeting on Gravitational Physics, eds. P. Nicolini, J. Mureika,
M. Kaminski, M. Bleicher | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Primordial black holes (PBHs) are of special interest because of the crucial
role of quantum effects in their formation and evaporation. This means that
they provide a unique probe of the early universe, high-energy physics and
quantum gravity. We highlight some recent developments in the subject,
including improved ... | [
{
"created": "Thu, 6 Feb 2014 17:52:12 GMT",
"version": "v1"
}
] | 2014-02-07 | [
[
"Carr",
"B. J.",
""
]
] | Primordial black holes (PBHs) are of special interest because of the crucial role of quantum effects in their formation and evaporation. This means that they provide a unique probe of the early universe, high-energy physics and quantum gravity. We highlight some recent developments in the subject, including improved li... |
2311.11926 | Jainendra Kumar Singh Dr. | J. K. Singh, Shaily, Harshna Balhara, Sushant G. Ghosh and Sunil D.
Maharaj | EDSFD parametrization in $ f(R,T) $ gravity with linear curvature terms | 16 pages, 18 figures | Physics of the Dark Universe, 2024 | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | This paper investigates the flat
Friedmann-Lema$\hat{\imath}$tre-Robertson-Walker (FLRW) cosmological model
using a suitable parameterization represented as a differential equation
concerning the energy density of the scalar field, $\rho_{\phi}$, in the
context of $f(R,T)$ gravity theory. This parameterization is kno... | [
{
"created": "Wed, 15 Nov 2023 15:37:07 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Apr 2024 19:37:28 GMT",
"version": "v2"
}
] | 2024-04-30 | [
[
"Singh",
"J. K.",
""
],
[
"Shaily",
"",
""
],
[
"Balhara",
"Harshna",
""
],
[
"Ghosh",
"Sushant G.",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | This paper investigates the flat Friedmann-Lema$\hat{\imath}$tre-Robertson-Walker (FLRW) cosmological model using a suitable parameterization represented as a differential equation concerning the energy density of the scalar field, $\rho_{\phi}$, in the context of $f(R,T)$ gravity theory. This parameterization is known... |
1511.06307 | Lucila Kraiselburd | Lucila Kraiselburd, Susana J. Landau, Marcelo Salgado, Daniel Sudarsky
and H\'ector Vucetich | Equivalence Principle in Chameleon Models | 42 pages, 15 figures Accepted for publication in PRD | Phys. Rev. D 97, 104044 (2018) | 10.1103/PhysRevD.97.104044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Most theories that predict time and/or space variation of fundamental
constants also predict violations of the Weak Equivalence Principle. In 2004
Khoury and Weltman proposed the so called chameleon field arguing that it could
help avoiding experimental bounds on the WEP while having a non-trivial
cosmological impact... | [
{
"created": "Thu, 19 Nov 2015 18:56:15 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jun 2016 00:16:42 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Jun 2016 17:27:13 GMT",
"version": "v3"
},
{
"created": "Thu, 9 Nov 2017 12:36:12 GMT",
"version": "v4"
},
{
"cre... | 2018-05-30 | [
[
"Kraiselburd",
"Lucila",
""
],
[
"Landau",
"Susana J.",
""
],
[
"Salgado",
"Marcelo",
""
],
[
"Sudarsky",
"Daniel",
""
],
[
"Vucetich",
"Héctor",
""
]
] | Most theories that predict time and/or space variation of fundamental constants also predict violations of the Weak Equivalence Principle. In 2004 Khoury and Weltman proposed the so called chameleon field arguing that it could help avoiding experimental bounds on the WEP while having a non-trivial cosmological impact. ... |
1606.04980 | Swati Singh | S. Singh, L.A. De Lorenzo, I. Pikovski and K.C. Schwab | Detecting continuous gravitational waves with superfluid $^4$He | null | null | 10.1088/1367-2630/aa78cb | null | gr-qc astro-ph.IM cond-mat.other quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Direct detection of gravitational waves is opening a new window onto our
universe. Here, we study the sensitivity to continuous-wave strain fields of a
kg-scale optomechanical system formed by the acoustic motion of superfluid
helium-4 parametrically coupled to a superconducting microwave cavity. This
narrowband dete... | [
{
"created": "Wed, 15 Jun 2016 21:10:15 GMT",
"version": "v1"
}
] | 2017-08-02 | [
[
"Singh",
"S.",
""
],
[
"De Lorenzo",
"L. A.",
""
],
[
"Pikovski",
"I.",
""
],
[
"Schwab",
"K. C.",
""
]
] | Direct detection of gravitational waves is opening a new window onto our universe. Here, we study the sensitivity to continuous-wave strain fields of a kg-scale optomechanical system formed by the acoustic motion of superfluid helium-4 parametrically coupled to a superconducting microwave cavity. This narrowband detect... |
2009.03778 | Yuan Chen | Yuan Chen, He-Xu Zhang, Tian-Chi Ma and Jian-Bo Deng | Optical properties of a nonlinear magnetic charged rotating black hole
surrounded by quintessence with a cosmological constant | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper,we discuss optical properties of the nonlinear magnetic charged
black hole surrounded by quintessence with a non-zero cosmological constant
$\Lambda$. Setting the state parameter $\omega=-3/2$ , we studied the horizon,
the photon region and the shadow of this black hole. It turned out that for a
fixed q... | [
{
"created": "Sun, 6 Sep 2020 11:07:05 GMT",
"version": "v1"
}
] | 2021-04-26 | [
[
"Chen",
"Yuan",
""
],
[
"Zhang",
"He-Xu",
""
],
[
"Ma",
"Tian-Chi",
""
],
[
"Deng",
"Jian-Bo",
""
]
] | In this paper,we discuss optical properties of the nonlinear magnetic charged black hole surrounded by quintessence with a non-zero cosmological constant $\Lambda$. Setting the state parameter $\omega=-3/2$ , we studied the horizon, the photon region and the shadow of this black hole. It turned out that for a fixed qui... |
1812.03376 | Bahram Mashhoon | Alireza Allahyari, Hassan Firouzjahi, and Bahram Mashhoon | Quasinormal Modes of a Black Hole with Quadrupole Moment | 45 pages; v2: presentation improved, matches published version | Phys. Rev. D 99, 044005 (2019) | 10.1103/PhysRevD.99.044005 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically determine the quasinormal mode (QNM) frequencies of a black
hole with quadrupole moment in the eikonal limit using the light-ring method.
The generalized black holes that are discussed in this work possess arbitrary
quadrupole and higher mass moments in addition to mass and angular momentum.
Static co... | [
{
"created": "Sat, 8 Dec 2018 19:29:01 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Feb 2019 17:28:38 GMT",
"version": "v2"
}
] | 2019-02-13 | [
[
"Allahyari",
"Alireza",
""
],
[
"Firouzjahi",
"Hassan",
""
],
[
"Mashhoon",
"Bahram",
""
]
] | We analytically determine the quasinormal mode (QNM) frequencies of a black hole with quadrupole moment in the eikonal limit using the light-ring method. The generalized black holes that are discussed in this work possess arbitrary quadrupole and higher mass moments in addition to mass and angular momentum. Static coll... |
1609.02751 | Chandra Prakash Singh | Pankaj Kumar, C.P. Singh | New agegraphic dark energy in Brans-Dicke theory with logarithmic form
of scalar field | 11 pages | Astrophys. Space Sci. 362, 52 (2017) | 10.1007/s10509-017-3032-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a very recent paper, the current authors (arXiv:gr-qc/1609.01477) have
proposed and analyzed in detail the logarithmic form of Brans-Dicke scalar
field $\phi$ as $\phi \propto ln(\alpha+\beta a)$, where $\alpha$ and $\beta$
are positive constants, to alleviate the problems of interacting holographic
dark energy mo... | [
{
"created": "Fri, 9 Sep 2016 11:51:27 GMT",
"version": "v1"
}
] | 2017-06-13 | [
[
"Kumar",
"Pankaj",
""
],
[
"Singh",
"C. P.",
""
]
] | In a very recent paper, the current authors (arXiv:gr-qc/1609.01477) have proposed and analyzed in detail the logarithmic form of Brans-Dicke scalar field $\phi$ as $\phi \propto ln(\alpha+\beta a)$, where $\alpha$ and $\beta$ are positive constants, to alleviate the problems of interacting holographic dark energy mode... |
gr-qc/9806015 | Robert Mann | I. S. Booth and R. B. Mann | Complex Instantons and Charged Rotating Black Hole Pair Creation | 11 pages, 1 figure, Latex, text shortened with only minor changes in
content, accepted for Phys Rev Letters | Phys.Rev.Lett.81:5052-5055,1998 | 10.1103/PhysRevLett.81.5052 | WATPHY-TH98/04 | gr-qc | null | We consider the general process of pair-creation of charged rotating black
holes. We find that instantons which describe this process are necessarily
complex due to regularity requirements. However their associated probabilities
are real, and fully consistent with the interpretation that the entropy of a
charged rota... | [
{
"created": "Wed, 3 Jun 1998 16:23:50 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Oct 1998 22:08:06 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Booth",
"I. S.",
""
],
[
"Mann",
"R. B.",
""
]
] | We consider the general process of pair-creation of charged rotating black holes. We find that instantons which describe this process are necessarily complex due to regularity requirements. However their associated probabilities are real, and fully consistent with the interpretation that the entropy of a charged rotati... |
1208.2984 | Bijunath Patla | Bijunath R. Patla | Small Angle Approximation for Non-parallel Plate Capacitors with
Applications in Experimental Gravitation | An error in Fig.3 fixed now. 14 pages, 5 figures. Submitted to
Journal of Electrostatics | null | null | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An approximate analytical formula for the capacitance of a non-parallel plate
capacitor with small values of inclination angles and distance separations of
the plates is presented. Most applications involving position sensing that are
employed in precision experiments and micromechanical devices often use a
parallel ... | [
{
"created": "Tue, 14 Aug 2012 21:59:44 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Aug 2012 17:02:17 GMT",
"version": "v2"
},
{
"created": "Thu, 16 May 2013 21:47:18 GMT",
"version": "v3"
}
] | 2013-05-20 | [
[
"Patla",
"Bijunath R.",
""
]
] | An approximate analytical formula for the capacitance of a non-parallel plate capacitor with small values of inclination angles and distance separations of the plates is presented. Most applications involving position sensing that are employed in precision experiments and micromechanical devices often use a parallel pl... |
gr-qc/0002038 | null | A.I.Nikishov (Lebedev Physics Institute) | Weinberg's energy-momentum pseudotensor for Schwarzschild field | 5 pages, Latex, no figures | null | null | null | gr-qc | null | Weinberg's energy-momentum pseudotensor is obtained for Schwarzschild metric
in harmonic coordinates. On the horizon it possesses unintegrable
singularities. For this reason the total energy of a collapsar can't be
obtained by integrating energy density over the system's volume. The
implication for gravity theories i... | [
{
"created": "Thu, 10 Feb 2000 14:53:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nikishov",
"A. I.",
"",
"Lebedev Physics Institute"
]
] | Weinberg's energy-momentum pseudotensor is obtained for Schwarzschild metric in harmonic coordinates. On the horizon it possesses unintegrable singularities. For this reason the total energy of a collapsar can't be obtained by integrating energy density over the system's volume. The implication for gravity theories is ... |
1206.0658 | Derek Wise | Steffen Gielen and Derek K. Wise | Linking Covariant and Canonical General Relativity via Local Observers | 8 pages; Essay written for the 2012 Gravity Research Foundation
Awards for Essays on Gravitation | Gen. Relativ. Gravit. 44 (2012) 3103-3109 | 10.1007/s10714-012-1443-3 | pi-qg-288 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hamiltonian gravity, relying on arbitrary choices of "space," can obscure
spacetime symmetries. We present an alternative, manifestly spacetime covariant
formulation that nonetheless distinguishes between "spatial" and "temporal"
variables. The key is viewing dynamical fields from the perspective of a field
of observ... | [
{
"created": "Mon, 4 Jun 2012 16:01:21 GMT",
"version": "v1"
}
] | 2012-11-12 | [
[
"Gielen",
"Steffen",
""
],
[
"Wise",
"Derek K.",
""
]
] | Hamiltonian gravity, relying on arbitrary choices of "space," can obscure spacetime symmetries. We present an alternative, manifestly spacetime covariant formulation that nonetheless distinguishes between "spatial" and "temporal" variables. The key is viewing dynamical fields from the perspective of a field of observer... |
0912.1285 | Christian Reisswig | C. Reisswig, N. T. Bishop, D. Pollney, B. Szilagyi | Characteristic extraction in numerical relativity: binary black hole
merger waveforms at null infinity | 41 pages, 8 figures, 2 tables, added references, fixed typos. Version
matches published version. | Class. Quantum Grav. 27 075014 (2010) | 10.1088/0264-9381/27/7/075014 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The accurate modeling of gravitational radiation is a key issue for
gravitational wave astronomy. As simulation codes reach higher accuracy,
systematic errors inherent in current numerical relativity wave-extraction
methods become evident, and may lead to a wrong astrophysical interpretation of
the data. In this pape... | [
{
"created": "Mon, 7 Dec 2009 16:05:47 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Mar 2010 17:52:48 GMT",
"version": "v2"
}
] | 2010-03-26 | [
[
"Reisswig",
"C.",
""
],
[
"Bishop",
"N. T.",
""
],
[
"Pollney",
"D.",
""
],
[
"Szilagyi",
"B.",
""
]
] | The accurate modeling of gravitational radiation is a key issue for gravitational wave astronomy. As simulation codes reach higher accuracy, systematic errors inherent in current numerical relativity wave-extraction methods become evident, and may lead to a wrong astrophysical interpretation of the data. In this paper,... |
1202.3256 | Joshua Logue | J. Logue (1), C. D. Ott (2), I. S. Heng (1), P. Kalmus (2), J.
Scargill (3) ((1) Glasgow, (2) Caltech, (3) Oxford) | Inferring Core-Collapse Supernova Physics with Gravitational Waves | 22 pages, 9 figures | null | 10.1103/PhysRevD.86.044023 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stellar collapse and the subsequent development of a core-collapse supernova
explosion emit bursts of gravitational waves (GWs) that might be detected by
the advanced generation of laser interferometer gravitational-wave
observatories such as Advanced LIGO, Advanced Virgo, and LCGT. GW bursts from
core-collapse super... | [
{
"created": "Wed, 15 Feb 2012 10:08:35 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Feb 2012 11:02:09 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Logue",
"J.",
"",
"Glasgow"
],
[
"Ott",
"C. D.",
"",
"Caltech"
],
[
"Heng",
"I. S.",
"",
"Glasgow"
],
[
"Kalmus",
"P.",
"",
"Caltech"
],
[
"Scargill",
"J.",
"",
"Oxford"
]
] | Stellar collapse and the subsequent development of a core-collapse supernova explosion emit bursts of gravitational waves (GWs) that might be detected by the advanced generation of laser interferometer gravitational-wave observatories such as Advanced LIGO, Advanced Virgo, and LCGT. GW bursts from core-collapse superno... |
gr-qc/9911080 | Dzhunushaliev Vladimir | V. Dzhunushaliev and H.-J. Schmidt | Wormholes and Flux Tubes in the 7D Gravity on the Principal Bundle with
SU(2) Gauge Group as the Extra Dimensions | 20 pages, 8 figures, the quality of the figures are improved | Phys.Rev.D62:044035,2000 | 10.1103/PhysRevD.62.044035 | UNIPO-MATH-99-November-18 | gr-qc hep-th | null | Vacuum solutions for multidimensional gravity on the principal bundle with
the SU(2) structural group as the extra dimensions are found and discussed.
This generalizes the results of Ref. \cite{vds3} from U(1) to the SU(2) gauge
group. The spherically symmetric solution with the off-diagonal components of
the multidi... | [
{
"created": "Mon, 22 Nov 1999 09:07:34 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Feb 2000 08:51:24 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Dzhunushaliev",
"V.",
""
],
[
"Schmidt",
"H. -J.",
""
]
] | Vacuum solutions for multidimensional gravity on the principal bundle with the SU(2) structural group as the extra dimensions are found and discussed. This generalizes the results of Ref. \cite{vds3} from U(1) to the SU(2) gauge group. The spherically symmetric solution with the off-diagonal components of the multidime... |
1601.06789 | Stephen Green | Stephen R. Green and Robert M. Wald | A Simple, Heuristic Derivation of our "No Backreaction" Results | 13 pages | null | 10.1088/0264-9381/33/12/125027 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a simple discussion of our results on the backreaction effects of
density inhomogeneities in cosmology, without mentioning one-parameter families
or weak limits. Emphasis is placed on the manner in which "averaging" is done
and the fact that one is solving Einstein's equation. The key assumptions and
resul... | [
{
"created": "Mon, 25 Jan 2016 21:00:10 GMT",
"version": "v1"
}
] | 2016-06-01 | [
[
"Green",
"Stephen R.",
""
],
[
"Wald",
"Robert M.",
""
]
] | We provide a simple discussion of our results on the backreaction effects of density inhomogeneities in cosmology, without mentioning one-parameter families or weak limits. Emphasis is placed on the manner in which "averaging" is done and the fact that one is solving Einstein's equation. The key assumptions and results... |
2112.15038 | Misba Afrin | Misba Afrin and Sushant G. Ghosh | Estimating the cosmological constant from shadows of Kerr--de Sitter
black holes | 10 figures, 1 table. Matched to the published version | Universe 2022, 8(1), 52 | 10.3390/universe8010052 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Event Horizon Telescope collaboration has revealed the first direct image
of a black hole, as per the shadow of a Kerr black hole of general relativity.
However, other Kerr-like rotating black holes of modified gravity theories
cannot be ignored, and they are essential as they offer an arena in which these
theori... | [
{
"created": "Thu, 30 Dec 2021 12:55:33 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jan 2022 12:15:00 GMT",
"version": "v2"
}
] | 2022-01-21 | [
[
"Afrin",
"Misba",
""
],
[
"Ghosh",
"Sushant G.",
""
]
] | The Event Horizon Telescope collaboration has revealed the first direct image of a black hole, as per the shadow of a Kerr black hole of general relativity. However, other Kerr-like rotating black holes of modified gravity theories cannot be ignored, and they are essential as they offer an arena in which these theories... |
2404.12028 | Federico De Santi | Federico De Santi, Massimiliano Razzano, Francesco Fidecaro, Luca
Muccillo, Lucia Papalini, and Barbara Patricelli | Deep learning to detect gravitational waves from binary close
encounters: Fast parameter estimation using normalizing flows | 49 pages, 14 figures, accepted for publication in Physical Review D
(PRD) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A yet undetected class of GW signals is represented by the close encounters
between compact objects in highly-eccentric e~1 orbits, that can occur in
binary systems formed in dense environments such as globular clusters. The
expected gravitational signals are short-duration pulses that would repeat over
a much longer... | [
{
"created": "Thu, 18 Apr 2024 09:26:23 GMT",
"version": "v1"
}
] | 2024-04-19 | [
[
"De Santi",
"Federico",
""
],
[
"Razzano",
"Massimiliano",
""
],
[
"Fidecaro",
"Francesco",
""
],
[
"Muccillo",
"Luca",
""
],
[
"Papalini",
"Lucia",
""
],
[
"Patricelli",
"Barbara",
""
]
] | A yet undetected class of GW signals is represented by the close encounters between compact objects in highly-eccentric e~1 orbits, that can occur in binary systems formed in dense environments such as globular clusters. The expected gravitational signals are short-duration pulses that would repeat over a much longer t... |
0804.2778 | Orest Hrycyna | Orest Hrycyna, Jakub Mielczarek, Marek Szydlowski | Effects of the quantisation ambiguities on the Big Bounce dynamics | RevTeX4, 28 pages, 11 figs; rev.2 new section on exact solutions;
(v3) published version | Gen.Rel.Grav.41:1025-1049,2009 | 10.1007/s10714-008-0689-2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate dynamics of the modified loop quantum cosmology
models using dynamical systems methods. Modifications considered come from the
choice of the different field strength operator $\hat{F}$ and result in
different forms of the effective Hamiltonian. Such an ambiguity of the choice
of this expr... | [
{
"created": "Thu, 17 Apr 2008 11:42:53 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Apr 2008 11:32:02 GMT",
"version": "v2"
},
{
"created": "Mon, 4 May 2009 17:23:12 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"Hrycyna",
"Orest",
""
],
[
"Mielczarek",
"Jakub",
""
],
[
"Szydlowski",
"Marek",
""
]
] | In this paper we investigate dynamics of the modified loop quantum cosmology models using dynamical systems methods. Modifications considered come from the choice of the different field strength operator $\hat{F}$ and result in different forms of the effective Hamiltonian. Such an ambiguity of the choice of this expres... |
gr-qc/0404078 | Valerio Faraoni | Valerio Faraoni | Coupled oscillators as models of phantom and scalar field cosmologies | 18 pages, LaTeX, to appear in Physical Review D | Phys.Rev. D69 (2004) 123520 | 10.1103/PhysRevD.69.123520 | null | gr-qc | null | We study a toy model for phantom cosmology recently introduced in the
literature and consisting of two oscillators, one of which carries negative
kinetic energy. The results are compared with the exact phase space picture
obtained for similar dynamical systems describing, respectively, a massive
canonical scalar fiel... | [
{
"created": "Sat, 17 Apr 2004 00:42:39 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Faraoni",
"Valerio",
""
]
] | We study a toy model for phantom cosmology recently introduced in the literature and consisting of two oscillators, one of which carries negative kinetic energy. The results are compared with the exact phase space picture obtained for similar dynamical systems describing, respectively, a massive canonical scalar field ... |
2311.08304 | Dmitriy Ovchinnikov | Dmitriy Ovchinnikov | Quasinormal ringing of Bardeen spacetime | Report prepared for the 25th RAGtime conference in Opava | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review recent calculations of quasinormal modes and asymptotic tails of
the Bardeen spacetime interpreted as a quantum corrected Schwarzschild-like
black holes. Massless electromagnetic and Dirac fields and massive scalar field
are considered. The first few overtones are much more sensitive to the change
of the qu... | [
{
"created": "Tue, 14 Nov 2023 16:46:29 GMT",
"version": "v1"
}
] | 2023-11-15 | [
[
"Ovchinnikov",
"Dmitriy",
""
]
] | We review recent calculations of quasinormal modes and asymptotic tails of the Bardeen spacetime interpreted as a quantum corrected Schwarzschild-like black holes. Massless electromagnetic and Dirac fields and massive scalar field are considered. The first few overtones are much more sensitive to the change of the quan... |
1903.01227 | Kimet Jusufi | Kimet Jusufi, Mubasher Jamil, Muhammad Rizwan | On the possibility of wormhole formation in the galactic halo due to
dark matter Bose-Einstein condensates | 15 pages, 9 figures. Accepted for publication in General Relativity
and Gravitation | Gen Relativ Gravit (2019) 51: 102 | 10.1007/s10714-019-2586-2 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been recently claimed that dark matter could be in the form of a
Bose-Einstein condensate (BEC) in order to explain the dynamics at large
distances from the galactic center [Boehmer, Harko, JCAP {\bf 0706}, 025
(2007)]. In this paper we explore the possibility of wormhole formation in
galactic halos due to the... | [
{
"created": "Mon, 4 Mar 2019 13:34:55 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Aug 2019 06:50:20 GMT",
"version": "v2"
}
] | 2019-08-27 | [
[
"Jusufi",
"Kimet",
""
],
[
"Jamil",
"Mubasher",
""
],
[
"Rizwan",
"Muhammad",
""
]
] | It has been recently claimed that dark matter could be in the form of a Bose-Einstein condensate (BEC) in order to explain the dynamics at large distances from the galactic center [Boehmer, Harko, JCAP {\bf 0706}, 025 (2007)]. In this paper we explore the possibility of wormhole formation in galactic halos due to the d... |
2205.05903 | Yu Hao | Hao Yu, Yu-Xiao Liu, Jin Li | Entropies of the various components of the universe | 25pages, 3figures | Chin.Phys.C 47 (2023) 5, 055105 | 10.1088/1674-1137/acc2ad | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the entropies of photons, dust (baryonic matter), dark
matter, and dark energy in the context of cosmology. When these components
expand freely with the universe, we calculate the entropy and specific entropy
of each component from the perspective of statistics. Under specific
assumptions and c... | [
{
"created": "Thu, 12 May 2022 06:53:31 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Feb 2024 09:09:30 GMT",
"version": "v2"
}
] | 2024-02-26 | [
[
"Yu",
"Hao",
""
],
[
"Liu",
"Yu-Xiao",
""
],
[
"Li",
"Jin",
""
]
] | In this work, we study the entropies of photons, dust (baryonic matter), dark matter, and dark energy in the context of cosmology. When these components expand freely with the universe, we calculate the entropy and specific entropy of each component from the perspective of statistics. Under specific assumptions and con... |
gr-qc/0507108 | Ricardo Rosas | R. Rosas-Rodriguez | A Hamiltonian functional for the linearized Einstein vacuum field
equations | 5 pages, accepted in J. Phys.: Conf. Series | J.Phys.Conf.Ser.24:231-235,2005 | 10.1088/1742-6596/24/1/027 | null | gr-qc | null | By considering the Einstein vacuum field equations linearized about the
Minkowski metric, the evolution equations for the gauge-invariant quantities
characterizing the gravitational field are written in a Hamiltonian form by
using a conserved functional as Hamiltonian; this Hamiltonian is not the analog
of the energy... | [
{
"created": "Tue, 26 Jul 2005 00:49:48 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Rosas-Rodriguez",
"R.",
""
]
] | By considering the Einstein vacuum field equations linearized about the Minkowski metric, the evolution equations for the gauge-invariant quantities characterizing the gravitational field are written in a Hamiltonian form by using a conserved functional as Hamiltonian; this Hamiltonian is not the analog of the energy o... |
gr-qc/9312037 | Kawai | Toshiharu Kawai | Poincar\'{e} gauge theory of gravity | 27pages, RevTeX, OCU-PHYS-152 | Phys.Rev. D49 (1994) 2862-2871 | 10.1103/PhysRevD.49.2862 | null | gr-qc | null | A Poincar\'{e} gauge theory of (2+1)-dimensional gravity is developed.
Fundamental gravitational field variables are dreibein fields and Lorentz gauge
potentials, and the theory is underlain with the Riemann-Cartan space-time. The
most general gravitational Lagrangian density, which is at most quadratic in
curvature ... | [
{
"created": "Mon, 27 Dec 1993 09:09:16 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Kawai",
"Toshiharu",
""
]
] | A Poincar\'{e} gauge theory of (2+1)-dimensional gravity is developed. Fundamental gravitational field variables are dreibein fields and Lorentz gauge potentials, and the theory is underlain with the Riemann-Cartan space-time. The most general gravitational Lagrangian density, which is at most quadratic in curvature an... |
1302.0724 | Hal Haggard | Hal M. Haggard and Carlo Rovelli | Death and resurrection of the zeroth principle of thermodynamics | 5 pages, 2 figures | Phys. Rev. D 87, 084001 (2013) | 10.1103/PhysRevD.87.084001 | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The zeroth principle of thermodynamics in the form "temperature is uniform at
equilibrium" is notoriously violated in relativistic gravity. Temperature
uniformity is often derived from the maximization of the total number of
microstates of two interacting systems under energy exchanges. Here we discuss
a generalized ... | [
{
"created": "Mon, 4 Feb 2013 15:36:07 GMT",
"version": "v1"
}
] | 2014-03-12 | [
[
"Haggard",
"Hal M.",
""
],
[
"Rovelli",
"Carlo",
""
]
] | The zeroth principle of thermodynamics in the form "temperature is uniform at equilibrium" is notoriously violated in relativistic gravity. Temperature uniformity is often derived from the maximization of the total number of microstates of two interacting systems under energy exchanges. Here we discuss a generalized ve... |
2002.04055 | Richard Brito | Richard Brito, Sara Grillo, Paolo Pani | Black hole superradiant instability from ultralight spin-2 fields | 13 pages, 4 Figures; v3: minor changes to match published version in
Physical Review Letters | Phys. Rev. Lett. 124, 211101 (2020) | 10.1103/PhysRevLett.124.211101 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultralight bosonic fields are compelling dark-matter candidates and arise in
a variety of beyond-Standard-Model scenarios. These fields can tap energy and
angular momentum from spinning black holes through superradiant instabilities,
during which a macroscopic bosonic condensate develops around the black hole.
Striki... | [
{
"created": "Mon, 10 Feb 2020 19:18:14 GMT",
"version": "v1"
},
{
"created": "Sun, 10 May 2020 16:01:10 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Jun 2020 10:21:33 GMT",
"version": "v3"
}
] | 2020-06-04 | [
[
"Brito",
"Richard",
""
],
[
"Grillo",
"Sara",
""
],
[
"Pani",
"Paolo",
""
]
] | Ultralight bosonic fields are compelling dark-matter candidates and arise in a variety of beyond-Standard-Model scenarios. These fields can tap energy and angular momentum from spinning black holes through superradiant instabilities, during which a macroscopic bosonic condensate develops around the black hole. Striking... |
2206.07574 | Antonio Gallerati | Antonio Gallerati, Giovanni Modanese, Giovanni Ummarino | Interaction between macroscopic quantum systems and gravity | 59 pages | Frontiers in Physics 10 (2022) 941858 | 10.3389/fphy.2022.941858 | null | gr-qc cond-mat.supr-con hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review experiments and theoretical models about the possible mutual
interplay between the gravitational field and materials in the superconducting
state or other macroscopic quantum states. More generally, we focus on the
possibility for quantum macrosystems in a coherent state to produce local
alterations of the ... | [
{
"created": "Wed, 15 Jun 2022 14:57:11 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jun 2022 09:03:15 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Jun 2022 14:09:15 GMT",
"version": "v3"
}
] | 2022-07-01 | [
[
"Gallerati",
"Antonio",
""
],
[
"Modanese",
"Giovanni",
""
],
[
"Ummarino",
"Giovanni",
""
]
] | We review experiments and theoretical models about the possible mutual interplay between the gravitational field and materials in the superconducting state or other macroscopic quantum states. More generally, we focus on the possibility for quantum macrosystems in a coherent state to produce local alterations of the gr... |
gr-qc/0507081 | Patrick Sutton | LIGO Scientific Collaboration and TAMA Collaboration | Upper limits from the LIGO and TAMA detectors on the rate of
gravitational-wave bursts | 15 pages, 11 figures, to be submitted to Phys Rev D. Updated author
list | Phys.Rev.D72:122004,2005 | 10.1103/PhysRevD.72.122004 | LIGO-P040050-06-Z | gr-qc | null | We report on the first joint search for gravitational waves by the TAMA and
LIGO collaborations. We looked for millisecond-duration unmodelled
gravitational-wave bursts in 473 hr of coincident data collected during early
2003. No candidate signals were found. We set an upper limit of 0.12 events per
day on the rate o... | [
{
"created": "Tue, 19 Jul 2005 01:43:57 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jul 2005 00:37:41 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Jul 2005 17:49:15 GMT",
"version": "v3"
}
] | 2012-08-27 | [
[
"LIGO Scientific Collaboration",
"",
""
],
[
"TAMA Collaboration",
"",
""
]
] | We report on the first joint search for gravitational waves by the TAMA and LIGO collaborations. We looked for millisecond-duration unmodelled gravitational-wave bursts in 473 hr of coincident data collected during early 2003. No candidate signals were found. We set an upper limit of 0.12 events per day on the rate of ... |
1204.2450 | Tadashi Takayanagi | Tadashi Takayanagi | Entanglement Entropy from a Holographic Viewpoint | Latex, 30 pages, invited review for Classical and Quantum Gravity,
minor corrections | Class.Quant.Grav. 29 (2012) 153001 | 10.1088/0264-9381/29/15/153001 | YITP-12-31; IPMU12-0067 | gr-qc cond-mat.str-el hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The entanglement entropy has been historically studied by many authors in
order to obtain quantum mechanical interpretations of the gravitational
entropy. The discovery of AdS/CFT correspondence leads to the idea of
holographic entanglement entropy, which is a clear solution to this important
problem in gravity. In t... | [
{
"created": "Wed, 11 Apr 2012 13:49:01 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Apr 2012 05:08:30 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Takayanagi",
"Tadashi",
""
]
] | The entanglement entropy has been historically studied by many authors in order to obtain quantum mechanical interpretations of the gravitational entropy. The discovery of AdS/CFT correspondence leads to the idea of holographic entanglement entropy, which is a clear solution to this important problem in gravity. In thi... |
gr-qc/0610013 | Sigbjorn Hervik | John D. Barrow and Sigbjorn Hervik | On the evolution of universes in quadratic theories of gravity | 18 pages, 2 figures, v2: matches published version | Phys.Rev.D74:124017,2006 | 10.1103/PhysRevD.74.124017 | null | gr-qc astro-ph hep-th | null | We use a dynamical systems approach to investigate Bianchi type I and II
universes in quadratic theories of gravity. Due to the complicated nature of
the equations of motion we focus on the stability of exact solutions and find
that there exists an isotropic FRW universe acting as a past attractor. This
may indicate ... | [
{
"created": "Tue, 3 Oct 2006 18:47:49 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Dec 2006 14:06:17 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Barrow",
"John D.",
""
],
[
"Hervik",
"Sigbjorn",
""
]
] | We use a dynamical systems approach to investigate Bianchi type I and II universes in quadratic theories of gravity. Due to the complicated nature of the equations of motion we focus on the stability of exact solutions and find that there exists an isotropic FRW universe acting as a past attractor. This may indicate th... |
2105.01548 | Adrian Lim | Adrian P.C. Lim | Loop representation of Quantum Gravity | null | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | A hyperlink is a finite set of non-intersecting simple closed curves in
$\mathbb{R}^4 \equiv \mathbb{R} \times \mathbb{R}^3$, each curve is either a
matter or geometric loop. We consider an equivalence class of such hyperlinks,
up to time-like isotopy, preserving time-ordering. Using an equivalence class
and after co... | [
{
"created": "Sat, 1 May 2021 05:47:38 GMT",
"version": "v1"
}
] | 2021-05-05 | [
[
"Lim",
"Adrian P. C.",
""
]
] | A hyperlink is a finite set of non-intersecting simple closed curves in $\mathbb{R}^4 \equiv \mathbb{R} \times \mathbb{R}^3$, each curve is either a matter or geometric loop. We consider an equivalence class of such hyperlinks, up to time-like isotopy, preserving time-ordering. Using an equivalence class and after colo... |
1908.11742 | Joao Paulo Manoel Pitelli | J. P. M. Pitelli, Vitor S. Barroso | Particle Production Between Isometric Frames on a Poincar\'e Patch of
$\text{AdS}_2$ | 4 pages. Accepted for publication in J. Math. Phys | null | 10.1063/1.5117832 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper [J. P. M. Pitelli, Phys. Rev. D {\bf 99}, 108701 (2019)],
one of us showed that the vacuum state associated to conformal fields on a
Poicar\'e patch of anti-de Sitter spacetime is not $\text{AdS}$ invariant for
fields satisfying non-trivial boundary conditions (by non-trivial we mean
neither Dirichl... | [
{
"created": "Fri, 30 Aug 2019 13:55:06 GMT",
"version": "v1"
}
] | 2019-10-02 | [
[
"Pitelli",
"J. P. M.",
""
],
[
"Barroso",
"Vitor S.",
""
]
] | In a recent paper [J. P. M. Pitelli, Phys. Rev. D {\bf 99}, 108701 (2019)], one of us showed that the vacuum state associated to conformal fields on a Poicar\'e patch of anti-de Sitter spacetime is not $\text{AdS}$ invariant for fields satisfying non-trivial boundary conditions (by non-trivial we mean neither Dirichlet... |
gr-qc/9508047 | Animals have rights | Kamilla Piotrkowska | Averaging, renormalization group and criticality in cosmology | 12 pages. Latex. Talk given at the South African Relativity Workshop,
Cape Town, June 1995 | null | null | null | gr-qc | null | Several problems in physics, in particular the averaging problem in gravity,
can be described in a formalism derived from the real-space Renormalization
Group (RG) methods. It is shown that the RG flow is provided by the
Ricci-Hamilton equations which are thereby provided with a {\it physical}
interpretation. The con... | [
{
"created": "Tue, 22 Aug 1995 11:37:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Piotrkowska",
"Kamilla",
""
]
] | Several problems in physics, in particular the averaging problem in gravity, can be described in a formalism derived from the real-space Renormalization Group (RG) methods. It is shown that the RG flow is provided by the Ricci-Hamilton equations which are thereby provided with a {\it physical} interpretation. The conne... |
2006.00669 | Kiyoshi Shiraishi | Kiyoshi Shiraishi | Evaluation of vacuum energy density around geometrical defects by the
WKB method | 11 pages, one figure | Soryushiron Kenkyu (Kyoto) 90 (1995), No. 4, pp. 95-106 | 10.24532/soken.90.4_95 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The energy density of a conformally invariant scalar field around a cosmic
string is estimated by the WKB method. This approach reproduces the precise
value obtained by the other authors using the exact mode-sum method or the
method of mirror images. The approximation is also in good agreement with the
exact result i... | [
{
"created": "Mon, 1 Jun 2020 02:10:32 GMT",
"version": "v1"
}
] | 2020-07-02 | [
[
"Shiraishi",
"Kiyoshi",
""
]
] | The energy density of a conformally invariant scalar field around a cosmic string is estimated by the WKB method. This approach reproduces the precise value obtained by the other authors using the exact mode-sum method or the method of mirror images. The approximation is also in good agreement with the exact result in ... |
gr-qc/0011074 | L. Sriramkumar | L. Sriramkumar | Fluctuations in the current and energy densities around a magnetic flux
carrying cosmic string | RevTeX, 13 Pages, 3 Figures | Class.Quant.Grav. 18 (2001) 1015-1025 | 10.1088/0264-9381/18/6/304 | null | gr-qc | null | We calculate the fluctuations in the current and energy densities for the
case of a quantized, minimally coupled, massless, complex scalar field around a
straight and infinitesimally thin cosmic string carrying magnetic flux. At zero
temperature, we evaluate the fluctuations in the current and energy densities
for ar... | [
{
"created": "Wed, 22 Nov 2000 00:08:43 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Sriramkumar",
"L.",
""
]
] | We calculate the fluctuations in the current and energy densities for the case of a quantized, minimally coupled, massless, complex scalar field around a straight and infinitesimally thin cosmic string carrying magnetic flux. At zero temperature, we evaluate the fluctuations in the current and energy densities for arbi... |
0912.3474 | Piotr Bizon | Piotr Bizo\'n and Andrzej Rostworowski | A note about late-time wave tails on a dynamical background | 4 pages | Phys.Rev.D81:084047,2010 | 10.1103/PhysRevD.81.084047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Consider a spherically symmetric spacetime generated by a self-gravitating
massless scalar field $\phi$ and let $\psi$ be a test (nonspherical) massless
scalar field propagating on this dynamical background. Gundlach, Price, and
Pullin \cite{gpp2} computed numerically the late-time tails for different
multipoles of t... | [
{
"created": "Thu, 17 Dec 2009 18:09:03 GMT",
"version": "v1"
}
] | 2010-05-11 | [
[
"Bizoń",
"Piotr",
""
],
[
"Rostworowski",
"Andrzej",
""
]
] | Consider a spherically symmetric spacetime generated by a self-gravitating massless scalar field $\phi$ and let $\psi$ be a test (nonspherical) massless scalar field propagating on this dynamical background. Gundlach, Price, and Pullin \cite{gpp2} computed numerically the late-time tails for different multipoles of the... |
gr-qc/0101024 | Scott A. Hughes | Scott A. Hughes | Comment on "Gravity Waves, Chaos, and Spinning Compact Binaries" | 1 page, comment on gr-qc/9910040 | Phys.Rev.Lett.85:5480,2000 | 10.1103/PhysRevLett.85.5480 | null | gr-qc astro-ph | null | In this comment, I argue that chaotic effects in binary black hole inspiral
will not strongly impact the detection of gravitational waves from such
systems.
| [
{
"created": "Fri, 5 Jan 2001 22:17:28 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Hughes",
"Scott A.",
""
]
] | In this comment, I argue that chaotic effects in binary black hole inspiral will not strongly impact the detection of gravitational waves from such systems. |
1801.01274 | Andronikos Paliathanasis | G. Papagiannopoulos, Spyros Basilakos, John D. Barrow and Andronikos
Paliathanasis | New integrable models and analytical solutions in $f(R)$~cosmology with
an ideal gas | 14 pages, 2 figures, to appear in Physical Review D | Phys. Rev. D 97, 024026 (2018) | 10.1103/PhysRevD.97.024026 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of $f\left( R\right) $-gravity with a spatially flat FLRW
metric containing an ideal fluid, we use the method of invariant
transformations to specify families of models which are integrable. We find
three families of $f(R)$ theories for which new analytical solutions are given
and closed-form solutions... | [
{
"created": "Thu, 4 Jan 2018 08:29:45 GMT",
"version": "v1"
}
] | 2018-01-25 | [
[
"Papagiannopoulos",
"G.",
""
],
[
"Basilakos",
"Spyros",
""
],
[
"Barrow",
"John D.",
""
],
[
"Paliathanasis",
"Andronikos",
""
]
] | In the context of $f\left( R\right) $-gravity with a spatially flat FLRW metric containing an ideal fluid, we use the method of invariant transformations to specify families of models which are integrable. We find three families of $f(R)$ theories for which new analytical solutions are given and closed-form solutions a... |
1811.01260 | Rahul Kumar | Rahul Kumar, Sushant G. Ghosh | Black Hole Parameter Estimation from Its Shadow | 18 pages, 14 figures, and 3 tables. Matched with the published
version | ApJ 892, 78 (2020) | 10.3847/1538-4357/ab77b0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Event Horizon Telescope (EHT), a global submillimeter wavelength very
long baseline interferometry array, unveiled event-horizon-scale images of the
supermassive black hole M87* as an asymmetric bright emission ring with a
diameter of $ 42 \pm 3\; \mu$as, and it is consistent with the shadow of a Kerr
black hole ... | [
{
"created": "Sat, 3 Nov 2018 18:04:33 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Feb 2019 16:02:21 GMT",
"version": "v2"
},
{
"created": "Tue, 18 Feb 2020 16:27:53 GMT",
"version": "v3"
},
{
"created": "Sun, 10 May 2020 11:00:45 GMT",
"version": "v4"
}
] | 2020-05-12 | [
[
"Kumar",
"Rahul",
""
],
[
"Ghosh",
"Sushant G.",
""
]
] | The Event Horizon Telescope (EHT), a global submillimeter wavelength very long baseline interferometry array, unveiled event-horizon-scale images of the supermassive black hole M87* as an asymmetric bright emission ring with a diameter of $ 42 \pm 3\; \mu$as, and it is consistent with the shadow of a Kerr black hole of... |
2004.11357 | Adri\`a Delhom | Jose Beltr\'an Jim\'enez and Adri\`a Delhom | Instabilities in Metric-Affine Theories of Gravity | 27 pp | null | 10.1140/epjc/s10052-020-8143-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the presence of ghostly instabilities for metric-affine theories
constructed with higher order curvature terms. We mainly focus on theories
containing only the Ricci tensor and show the crucial role played by the
projective symmetry. The pathological modes arise from the absence of a pure
kinetic term for ... | [
{
"created": "Thu, 23 Apr 2020 17:55:54 GMT",
"version": "v1"
}
] | 2021-04-23 | [
[
"Jiménez",
"Jose Beltrán",
""
],
[
"Delhom",
"Adrià",
""
]
] | We discuss the presence of ghostly instabilities for metric-affine theories constructed with higher order curvature terms. We mainly focus on theories containing only the Ricci tensor and show the crucial role played by the projective symmetry. The pathological modes arise from the absence of a pure kinetic term for th... |
1006.1834 | Khaled Saaidi | Kh. Saaidi, A.Aghamohammadi, M. R. Setare | Holographic dark energy with time depend gravitational constant in the
non-flat Ho$\check{r}$ava-Lifshitz cosmology | 11 pages | Astrophys. Space Sci. 332 (2011) 503 | 10.1007/s10509-010-0531-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the holographic dark energy on the subject of
Ho$\check{r}$ava-Lifshitz gravity with a time dependent gravitational constant
(G(t)), in the non-flat space-time. We obtain the differential equation that
specify the evolution of the dark energy density parameter based on varying
gravitational constant. we find... | [
{
"created": "Wed, 9 Jun 2010 15:34:38 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Oct 2010 07:06:13 GMT",
"version": "v2"
}
] | 2014-01-20 | [
[
"Saaidi",
"Kh.",
""
],
[
"Aghamohammadi",
"A.",
""
],
[
"Setare",
"M. R.",
""
]
] | We study the holographic dark energy on the subject of Ho$\check{r}$ava-Lifshitz gravity with a time dependent gravitational constant (G(t)), in the non-flat space-time. We obtain the differential equation that specify the evolution of the dark energy density parameter based on varying gravitational constant. we find o... |
gr-qc/9702039 | Ulf Nilsson | Ulf S. Nilsson, C. Uggla | Stationary Bianchi type II perfect fluid models | 6 pages, 1 figure LaTeX. To appear in JMP | null | 10.1063/1.531998 | null | gr-qc | null | Einstein's field equations for stationary Bianchi type II models with a
perfect fluid source are investigated. The field equations are rewritten as a
system of autonomous first order differential equations. Dimensionless
variables are subsequently introduced for which the reduced phase space is
compact. The system is... | [
{
"created": "Thu, 20 Feb 1997 15:10:28 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Nilsson",
"Ulf S.",
""
],
[
"Uggla",
"C.",
""
]
] | Einstein's field equations for stationary Bianchi type II models with a perfect fluid source are investigated. The field equations are rewritten as a system of autonomous first order differential equations. Dimensionless variables are subsequently introduced for which the reduced phase space is compact. The system is t... |
1904.09244 | Ward Struyve | Thibaut Demaerel, Ward Struyve | Elimination of cosmological singularities in quantum cosmology by
suitable operator orderings | 9 pages, no figures, Latex; v2 minor improvements | Phys. Rev. D 100, 046008 (2019) | 10.1103/PhysRevD.100.046008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Canonical quantization of general relativity does not yield a unique quantum
theory for gravity. This is in part due to operator ordering ambiguities. In
this paper, we investigate the role of different operator orderings on the
question of whether a big bang or big crunch singularity occurs. We do this in
the contex... | [
{
"created": "Fri, 19 Apr 2019 15:53:08 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Aug 2019 17:50:12 GMT",
"version": "v2"
}
] | 2019-08-21 | [
[
"Demaerel",
"Thibaut",
""
],
[
"Struyve",
"Ward",
""
]
] | Canonical quantization of general relativity does not yield a unique quantum theory for gravity. This is in part due to operator ordering ambiguities. In this paper, we investigate the role of different operator orderings on the question of whether a big bang or big crunch singularity occurs. We do this in the context ... |
2408.01468 | Faizuddin Ahmed | Faizuddin Ahmed | Higher-dimensional topologically charged traversable defect wormhole
with non-exotic matter | 12 pages, accepted in IJMPA
(https://doi.org/10.1142/S0217751X24500878) | null | 10.1142/S0217751X24500878 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this study, we explore a topologically charged higher-dimensional
traversable defect wormhole, with a specific emphasis on five dimensions.
Particularly noteworthy is the fact that the matter-energy distribution
attributed to this charged wormhole configuration adheres to the weak energy
condition, thus presenting... | [
{
"created": "Thu, 1 Aug 2024 05:19:27 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"Ahmed",
"Faizuddin",
""
]
] | In this study, we explore a topologically charged higher-dimensional traversable defect wormhole, with a specific emphasis on five dimensions. Particularly noteworthy is the fact that the matter-energy distribution attributed to this charged wormhole configuration adheres to the weak energy condition, thus presenting a... |
0710.3677 | Peng Xu | Peng Xu and Yongge Ma | Five-dimensional PPN formalism and experimental test of Kaluza-Klein
theory | 4 pages, 1 table, accepted for publication in Physics Letters B | Phys.Lett.B656:165-168,2007 | 10.1016/j.physletb.2007.09.035 | null | gr-qc astro-ph hep-th | null | The parametrized post Newtonian formalism for 5-dimensional metric theories
with a compact extra dimension is developed. The relation of the 5-dimensional
and 4-dimensional formulations is then analyzed, in order to compare the higher
dimensional theories of gravity with experiments. It turns out that the value
of po... | [
{
"created": "Fri, 19 Oct 2007 11:27:31 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Xu",
"Peng",
""
],
[
"Ma",
"Yongge",
""
]
] | The parametrized post Newtonian formalism for 5-dimensional metric theories with a compact extra dimension is developed. The relation of the 5-dimensional and 4-dimensional formulations is then analyzed, in order to compare the higher dimensional theories of gravity with experiments. It turns out that the value of post... |
1412.1725 | Oleg Zaslavskii | O. B. Zaslavskii | On geodesics with negative energies in the ergoregions of dirty black
holes | 6 pages | Mod. Phys. Lett. A, 30, 1550055 (2015) | 10.1142/S0217732315500558 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider behavior of equatorial geodesics with the negative energy in the
ergoregion of a generic rotating "dirty" (surrounded by matter) black hole. It
is shown that under very simple and generic conditions on the metric
coefficients, there are no such circular orbits. This entails that such
geodesic must origina... | [
{
"created": "Thu, 4 Dec 2014 16:45:47 GMT",
"version": "v1"
}
] | 2015-03-27 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We consider behavior of equatorial geodesics with the negative energy in the ergoregion of a generic rotating "dirty" (surrounded by matter) black hole. It is shown that under very simple and generic conditions on the metric coefficients, there are no such circular orbits. This entails that such geodesic must originate... |
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