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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0203013 | Abel Camacho Quintana | A. Camacho (Department of Physics, Instituto Nacional de
Investigaciones Nucleares, Mexico.) | Gravitomagnetism in Metric Theories: Analysis of Earth Satellites
Results, and its Coupling with Spin | 10 pages | Gen.Rel.Grav. 34 (2002) 1403-1409 | 10.1023/A:1020078802195 | null | gr-qc | null | Employing the PPN formalism the gravitomagnetic field in different metric
theories is considered in the analysis of the LAGEOS results. It will be shown
that there are several models that predict exactly the same effect that general
relativity comprises. In other words, these Earth satellites results can be
taken as ... | [
{
"created": "Mon, 4 Mar 2002 12:00:52 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Camacho",
"A.",
"",
"Department of Physics, Instituto Nacional de\n Investigaciones Nucleares, Mexico."
]
] | Employing the PPN formalism the gravitomagnetic field in different metric theories is considered in the analysis of the LAGEOS results. It will be shown that there are several models that predict exactly the same effect that general relativity comprises. In other words, these Earth satellites results can be taken as ex... |
1312.7040 | Katsuki Aoki | Katsuki Aoki and Kei-ichi Maeda | Cosmology in ghost-free bigravity theory with twin matter fluids: The
origin of "dark matter" | 23 pages, 24 figures | Phys. Rev. D 89, 064051 (2014) | 10.1103/PhysRevD.89.064051 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study dynamics of Friedmann-Lemaitre-Robertson-Walker (FLRW) spacetime
based on the ghost-free bigravity theory. Assuming the coupling parameters
guaranteeing the existence of de Sitter space as well as Minkowski spacetime,
we find two stable attractors for spacetime with "twin" dust matter fields: One
is de Sitte... | [
{
"created": "Thu, 26 Dec 2013 02:18:06 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jan 2014 09:28:58 GMT",
"version": "v2"
}
] | 2014-03-26 | [
[
"Aoki",
"Katsuki",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We study dynamics of Friedmann-Lemaitre-Robertson-Walker (FLRW) spacetime based on the ghost-free bigravity theory. Assuming the coupling parameters guaranteeing the existence of de Sitter space as well as Minkowski spacetime, we find two stable attractors for spacetime with "twin" dust matter fields: One is de Sitter ... |
1108.0210 | Umpei Miyamoto | Umpei Miyamoto, Hiroya Nemoto, Masahiro Shimano | Naked Singularity Explosion in Higher Dimensions | 19 pages, 2 figures; v2: typos fixed | Phys. Rev. D 84, 064045 (2011) | 10.1103/PhysRevD.84.064045 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the recent argument that in the TeV-scale gravity
trans-Planckian domains of spacetime as effective naked singularities would be
generated by high-energy particle (and black-hole) collisions, we investigate
the quantum particle creation by naked-singularity formation in general
dimensions. Background spa... | [
{
"created": "Sun, 31 Jul 2011 23:33:56 GMT",
"version": "v1"
},
{
"created": "Sat, 1 Oct 2011 23:15:10 GMT",
"version": "v2"
}
] | 2012-03-06 | [
[
"Miyamoto",
"Umpei",
""
],
[
"Nemoto",
"Hiroya",
""
],
[
"Shimano",
"Masahiro",
""
]
] | Motivated by the recent argument that in the TeV-scale gravity trans-Planckian domains of spacetime as effective naked singularities would be generated by high-energy particle (and black-hole) collisions, we investigate the quantum particle creation by naked-singularity formation in general dimensions. Background space... |
gr-qc/9902037 | Jacek Wisniewski | Jerzy Lewandowski and Jacek Wisniewski | Degenerate Sectors of the Ashtekar Gravity | 19 pages, latex | Class.Quant.Grav. 16 (1999) 3057-3069 | 10.1088/0264-9381/16/10/303 | null | gr-qc | null | This work completes the task of solving locally the Einstein-Ashtekar
equations for degenerate data. The two remaining degenerate sectors of the
classical 3+1 dimensional theory are considered. First, with all densitized
triad vectors linearly dependent and second, with only two independent ones. It
is shown how to s... | [
{
"created": "Thu, 11 Feb 1999 19:37:39 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Lewandowski",
"Jerzy",
""
],
[
"Wisniewski",
"Jacek",
""
]
] | This work completes the task of solving locally the Einstein-Ashtekar equations for degenerate data. The two remaining degenerate sectors of the classical 3+1 dimensional theory are considered. First, with all densitized triad vectors linearly dependent and second, with only two independent ones. It is shown how to sol... |
2303.14575 | Santosh Lohakare | Santosh V. Lohakare and Krishna Rathore and B. Mishra | Observational constrained $F(R, \mathcal{G})$ gravity cosmological model
and the dynamical system analysis | 22 pages, 6 figures | Class. and Quantum Grav. 40 (2023) 215009 | 10.1088/1361-6382/acfc0f | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have analyzed the geometrical and dynamical parameters of
$\mathcal{F}(R, \mathcal{G})=\alpha R^2 \mathcal{G}^\beta$ cosmological model,
($R$, $\mathcal{G}$ being the Ricci scalar and Gauss-Bonnet invariant
respectively), constraining the parameters through the cosmological data sets.
It is exhibite... | [
{
"created": "Sat, 25 Mar 2023 22:18:59 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Oct 2023 07:20:56 GMT",
"version": "v2"
}
] | 2023-10-11 | [
[
"Lohakare",
"Santosh V.",
""
],
[
"Rathore",
"Krishna",
""
],
[
"Mishra",
"B.",
""
]
] | In this paper, we have analyzed the geometrical and dynamical parameters of $\mathcal{F}(R, \mathcal{G})=\alpha R^2 \mathcal{G}^\beta$ cosmological model, ($R$, $\mathcal{G}$ being the Ricci scalar and Gauss-Bonnet invariant respectively), constraining the parameters through the cosmological data sets. It is exhibited ... |
2307.16627 | Ke Gao | Ke Gao, Lei-Hua Liu | Can wormholes and black holes be distinguished by magnification? | 7 pages, 9 figures, Modifing details and typos | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The magnification effect of wormholes and black holes has been extensively
researched. It is crucial to provide a finite distance analysis to understand
this magnification phenomenon better. In this article, the rotational
Simpson-Visser metric (RSV) is chosen as the focus of research. By calculating
the deflection o... | [
{
"created": "Mon, 31 Jul 2023 13:05:30 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2023 12:15:30 GMT",
"version": "v2"
}
] | 2023-08-08 | [
[
"Gao",
"Ke",
""
],
[
"Liu",
"Lei-Hua",
""
]
] | The magnification effect of wormholes and black holes has been extensively researched. It is crucial to provide a finite distance analysis to understand this magnification phenomenon better. In this article, the rotational Simpson-Visser metric (RSV) is chosen as the focus of research. By calculating the deflection of ... |
0906.1385 | Andrew Randono | Andrew Randono | Do Spinors Frame-Drag? | V2: published version, mostly minor clarifications from V1 | Phys.Rev.D81:024027,2010 | 10.1103/PhysRevD.81.024027 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effect of the intrinsic spin of a fundamental spinor field
on the surrounding spacetime geometry. We show that despite the lack of a
rotating stress-energy source (and despite claims to the contrary) the
intrinsic spin of a spin-half fermion gives rise to a frame-dragging effect
analogous to that o... | [
{
"created": "Sun, 7 Jun 2009 20:04:08 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Feb 2010 23:03:12 GMT",
"version": "v2"
}
] | 2010-03-04 | [
[
"Randono",
"Andrew",
""
]
] | We investigate the effect of the intrinsic spin of a fundamental spinor field on the surrounding spacetime geometry. We show that despite the lack of a rotating stress-energy source (and despite claims to the contrary) the intrinsic spin of a spin-half fermion gives rise to a frame-dragging effect analogous to that of ... |
1003.2056 | Diego Marin Ph.D. | Marin Diego (University of Trento - Italy -, Department of Physics and
Associated Group of INFN Trento, Padova Section) | Quantizable non-local gravity | 12 pages | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It's widely recognized that general relativity emerges if we impose
invariance under local translations and local Lorentz transformations. In the
same manner supergravity arises when we impose invariance under local
supersymmetry. In this paper we show how to treat general relativity as a
common gauge theory, without... | [
{
"created": "Wed, 10 Mar 2010 09:36:11 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Mar 2010 12:36:46 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Jun 2012 22:24:21 GMT",
"version": "v3"
},
{
"created": "Mon, 1 Oct 2012 17:58:26 GMT",
"version": "v4"
},
{
"cre... | 2012-10-16 | [
[
"Diego",
"Marin",
"",
"University of Trento - Italy -, Department of Physics and\n Associated Group of INFN Trento, Padova Section"
]
] | It's widely recognized that general relativity emerges if we impose invariance under local translations and local Lorentz transformations. In the same manner supergravity arises when we impose invariance under local supersymmetry. In this paper we show how to treat general relativity as a common gauge theory, without i... |
1301.7348 | Wolfgang Kastaun | Wolfgang Kastaun and Filippo Galeazzi and Daniela Alic and Luciano
Rezzolla and Jose A. Font | On the black hole from merging binary neutron stars: how fast can it
spin? | 4 pages, 2 figures Version to appear in PRD Rapid Communications | Phys Rev D 88 021501 (2013) | 10.1103/PhysRevD.88.021501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The merger of two neutron stars will in general lead to the formation of a
torus surrounding a black hole whose rotational energy can be tapped to
potentially power a short gamma-ray burst. We have studied the merger of
equal-mass binaries with spins aligned with the orbital angular momentum to
determine the maximum ... | [
{
"created": "Wed, 30 Jan 2013 20:17:58 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2013 11:42:16 GMT",
"version": "v2"
}
] | 2013-10-11 | [
[
"Kastaun",
"Wolfgang",
""
],
[
"Galeazzi",
"Filippo",
""
],
[
"Alic",
"Daniela",
""
],
[
"Rezzolla",
"Luciano",
""
],
[
"Font",
"Jose A.",
""
]
] | The merger of two neutron stars will in general lead to the formation of a torus surrounding a black hole whose rotational energy can be tapped to potentially power a short gamma-ray burst. We have studied the merger of equal-mass binaries with spins aligned with the orbital angular momentum to determine the maximum sp... |
gr-qc/9505047 | null | A.A.Bytsenko, E.Elizalde and S.D.Odintsov | The conformal anomaly in N-dimensional space having a hyperbolic spatial
section | 10 pages, LATEX file, to appear in J. of Math.Phys | J.Math.Phys.36:5084-5090,1995 | 10.1063/1.531215 | null | gr-qc | null | The conformal anomaly for spinors and scalars on a N-dimensional hyperbolic
space is calculated explicitly, by using zeta-function regularization
techniques and the Selberg trace formula. In the case of conformally invariant
spinors and scalars the results are very much related with those corresponding
to a N-dimensi... | [
{
"created": "Fri, 26 May 1995 10:46:34 GMT",
"version": "v1"
}
] | 2009-09-17 | [
[
"Bytsenko",
"A. A.",
""
],
[
"Elizalde",
"E.",
""
],
[
"Odintsov",
"S. D.",
""
]
] | The conformal anomaly for spinors and scalars on a N-dimensional hyperbolic space is calculated explicitly, by using zeta-function regularization techniques and the Selberg trace formula. In the case of conformally invariant spinors and scalars the results are very much related with those corresponding to a N-dimension... |
2104.02183 | Jong-Ping Hsu | Jong-Ping Hsu and Leonardo Hsu | Dynamic Models for the Beginning, Hubble Law and the Future of the
Universe Based on Strong Cosmological Principle and Yang-Mills Gravity | 11 pages, 14th International Conf. on Gravitation, Astrophysics and
Cosmology (ICGAC14) | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss highly simplified dynamic models for the beginning, expansion and
future of the universe based on the strong cosmological principle and
Yang-Mills gravity in flat space-time. We derive a relativistic Okubo equation
of motion for galaxies with a time-dependent effective metric tensor
$G_{\mu\nu}(t)$. The st... | [
{
"created": "Mon, 5 Apr 2021 22:55:16 GMT",
"version": "v1"
}
] | 2021-04-07 | [
[
"Hsu",
"Jong-Ping",
""
],
[
"Hsu",
"Leonardo",
""
]
] | We discuss highly simplified dynamic models for the beginning, expansion and future of the universe based on the strong cosmological principle and Yang-Mills gravity in flat space-time. We derive a relativistic Okubo equation of motion for galaxies with a time-dependent effective metric tensor $G_{\mu\nu}(t)$. The stro... |
1308.5223 | Sarp Akcay | Sarp Akcay, Niels Warburton, and Leor Barack | Frequency-domain algorithm for the Lorenz-gauge gravitational self-force | 27 pages, 4 figures | Phys. Rev. D88:104009 (2013) | 10.1103/PhysRevD.88.104009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | State-of-the-art computations of the gravitational self-force (GSF) on
massive particles in black hole spacetimes involve numerical evolution of the
metric perturbation equations in the time-domain, which is computationally very
costly. We present here a new strategy, based on a frequency-domain treatment
of the pert... | [
{
"created": "Fri, 23 Aug 2013 11:34:19 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Nov 2013 15:21:42 GMT",
"version": "v2"
}
] | 2013-11-27 | [
[
"Akcay",
"Sarp",
""
],
[
"Warburton",
"Niels",
""
],
[
"Barack",
"Leor",
""
]
] | State-of-the-art computations of the gravitational self-force (GSF) on massive particles in black hole spacetimes involve numerical evolution of the metric perturbation equations in the time-domain, which is computationally very costly. We present here a new strategy, based on a frequency-domain treatment of the pertur... |
1608.03272 | Ujjal Debnath | Pameli Saha and Ujjal Debnath | Reconstructions of $f(T)$ Gravity from Entropy Corrected Holographic and
New Agegraphic Dark Energy Models in Power-law and Logarithmic Versions | 20 pages, 40 figures, Accepted in EPJC. arXiv admin note: text
overlap with arXiv:1004.1805 by other authors | null | 10.1140/epjc/s10052-016-4324-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here, we peruse cosmological usage of the most promising candidates of dark
energy in the framework of $f(T)$ gravity theory. We reconstruct the different
$f(T)$ modifed gravity models in the spatially flat FRW universe according to
entropy-corrected versions of the holographic and new agegraphic dark energy
models i... | [
{
"created": "Wed, 10 Aug 2016 07:30:06 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Aug 2016 14:22:40 GMT",
"version": "v2"
}
] | 2016-10-12 | [
[
"Saha",
"Pameli",
""
],
[
"Debnath",
"Ujjal",
""
]
] | Here, we peruse cosmological usage of the most promising candidates of dark energy in the framework of $f(T)$ gravity theory. We reconstruct the different $f(T)$ modifed gravity models in the spatially flat FRW universe according to entropy-corrected versions of the holographic and new agegraphic dark energy models in ... |
1712.09844 | Emil Nissimov | Eduardo Guendelman, Emil Nissimov, Svetlana Pacheva | Wheeler-DeWitt Quantization of Gravity Models of Unified Dark Energy and
Dark Matter | 15 pages, to be published in the Proceedings of QTS10 - 10th
International Symposium "Quantum Theory and Symmetries" (Varna, 2017),
Springer Proceedings in Mathematics and Statistics, V. Dobrev (ed.). arXiv
admin note: text overlap with arXiv:1609.06915 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | First, we describe the construction of a new type of gravity-matter models
based on the formalism of non-Riemannian space-time volume forms - alternative
generally covariant integration measure densities (volume elements) defined in
terms of auxiliary antisymmetric tensor gauge fields. Here gravity couples in a
non-c... | [
{
"created": "Thu, 28 Dec 2017 12:40:58 GMT",
"version": "v1"
}
] | 2017-12-29 | [
[
"Guendelman",
"Eduardo",
""
],
[
"Nissimov",
"Emil",
""
],
[
"Pacheva",
"Svetlana",
""
]
] | First, we describe the construction of a new type of gravity-matter models based on the formalism of non-Riemannian space-time volume forms - alternative generally covariant integration measure densities (volume elements) defined in terms of auxiliary antisymmetric tensor gauge fields. Here gravity couples in a non-con... |
gr-qc/9902052 | Lee Lindblom | Lee Lindblom, Gregory Mendell, and Benjamin J. Owen | Second-order rotational effects on the r-modes of neutron stars | 13 pages, 5 figures, revtex | Phys. Rev. D 60, 064006 (1999) | 10.1103/PhysRevD.60.064006 | null | gr-qc astro-ph | null | Techniques are developed here for evaluating the r-modes of rotating neutron
stars through second order in the angular velocity of the star. Second-order
corrections to the frequencies and eigenfunctions for these modes are evaluated
for neutron star models. The second-order eigenfunctions for these modes are
determi... | [
{
"created": "Thu, 18 Feb 1999 17:44:53 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Lindblom",
"Lee",
""
],
[
"Mendell",
"Gregory",
""
],
[
"Owen",
"Benjamin J.",
""
]
] | Techniques are developed here for evaluating the r-modes of rotating neutron stars through second order in the angular velocity of the star. Second-order corrections to the frequencies and eigenfunctions for these modes are evaluated for neutron star models. The second-order eigenfunctions for these modes are determine... |
gr-qc/9901012 | null | Pedro F. Gonzalez-Diaz (IMAFF, CSIC, Madrid) | Perdurance of multiply connected de Sitter space | 13 pages, RevTex | Phys.Rev. D59 (1999) 123513 | 10.1103/PhysRevD.59.123513 | IMAFF-RCA-99-01 | gr-qc | null | This paper deals with a study of the effects that spherically symmetric
first-order metric perturbations and vacuum quantum fluctuations have on the
stability of the multiply connected de Sitter spacetime recently proposed by
Gott and Li. It is the main conclusion of this study that although such a
spacetime is stabl... | [
{
"created": "Wed, 6 Jan 1999 13:06:54 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gonzalez-Diaz",
"Pedro F.",
"",
"IMAFF, CSIC, Madrid"
]
] | This paper deals with a study of the effects that spherically symmetric first-order metric perturbations and vacuum quantum fluctuations have on the stability of the multiply connected de Sitter spacetime recently proposed by Gott and Li. It is the main conclusion of this study that although such a spacetime is stable ... |
gr-qc/0408055 | Julien Sylvestre | Julien Sylvestre | Simulations of laser locking to a LISA arm | 7 figures, 8 pages | Phys.Rev. D70 (2004) 102002 | 10.1103/PhysRevD.70.102002 | null | gr-qc | null | We present detailed numerical simulations of a laser phase stabilization
scheme for LISA, where both lasers emitting along one arm are locked to each
other. Including the standard secondary noises and spacecraft motions that
approximately mimic LISA's orbit, we verify that very stable laser phases can
be obtained, an... | [
{
"created": "Wed, 18 Aug 2004 00:26:40 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Sylvestre",
"Julien",
""
]
] | We present detailed numerical simulations of a laser phase stabilization scheme for LISA, where both lasers emitting along one arm are locked to each other. Including the standard secondary noises and spacecraft motions that approximately mimic LISA's orbit, we verify that very stable laser phases can be obtained, and ... |
1602.01216 | Dhrubo Jyoti | Stephon Alexander, Dhrubo Jyoti, Joao Magueijo | Inflation and the Measurement Problem | 5 pages, 2 figures (Minor language edits; added some references) | Phys. Rev. D 94, 043502 (2016) | 10.1103/PhysRevD.94.043502 | null | gr-qc astro-ph.CO hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a solution to the quantum measurement problem in Inflation. Our
model treats Fourier modes of cosmological perturbations as analogous to
particles in a weakly-interacting Bose gas. We generalize the idea of a
macroscopic wavefunction to cosmological fields, and construct a
self-interaction Hamiltonian that... | [
{
"created": "Wed, 3 Feb 2016 07:40:25 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Mar 2016 18:45:25 GMT",
"version": "v2"
}
] | 2016-08-10 | [
[
"Alexander",
"Stephon",
""
],
[
"Jyoti",
"Dhrubo",
""
],
[
"Magueijo",
"Joao",
""
]
] | We propose a solution to the quantum measurement problem in Inflation. Our model treats Fourier modes of cosmological perturbations as analogous to particles in a weakly-interacting Bose gas. We generalize the idea of a macroscopic wavefunction to cosmological fields, and construct a self-interaction Hamiltonian that f... |
2007.04685 | Dirk Puetzfeld | Peter A. Hogan, Dirk Puetzfeld | Kerr Analogue of Kinnersley's Field of an Arbitrarily Accelerating Point
Mass | 9 pages | Phys. Rev. D 102, 044044 (2020) | 10.1103/PhysRevD.102.044044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the field of an arbitrarily accelerating and rotating point mass
which specializes to the Kerr solution when the acceleration vanishes and
specializes to Kinnersley's arbitrarily accelerating point mass when the
rotation vanishes.
| [
{
"created": "Thu, 9 Jul 2020 10:27:40 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Aug 2020 10:01:59 GMT",
"version": "v2"
}
] | 2020-08-28 | [
[
"Hogan",
"Peter A.",
""
],
[
"Puetzfeld",
"Dirk",
""
]
] | We construct the field of an arbitrarily accelerating and rotating point mass which specializes to the Kerr solution when the acceleration vanishes and specializes to Kinnersley's arbitrarily accelerating point mass when the rotation vanishes. |
gr-qc/9803044 | Nese Ozdemir | A.N. Aliev, M. Hortacsu and N. Ozdemir | Vacuum Fluctuations of a massless spin-1/2 field around multiple cosmic
strings | Class. Quantum Grav. 14(1997) 3215 | Class.Quant.Grav. 14 (1997) 3215-3224 | 10.1088/0264-9381/14/12/008 | null | gr-qc | null | We study the interaction of a massless quantized spinor field with the
gravitational filed of N parallel static cosmic strings by using a perturbative
approach. We show that the presence of more than one cosmic string gives rise
to an additional contribution to the energy density of vacuum fluctuations,
thereby leadi... | [
{
"created": "Thu, 12 Mar 1998 16:13:37 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Aliev",
"A. N.",
""
],
[
"Hortacsu",
"M.",
""
],
[
"Ozdemir",
"N.",
""
]
] | We study the interaction of a massless quantized spinor field with the gravitational filed of N parallel static cosmic strings by using a perturbative approach. We show that the presence of more than one cosmic string gives rise to an additional contribution to the energy density of vacuum fluctuations, thereby leading... |
gr-qc/0210015 | null | I. Ciufolini (University of Lecce), S. Kopeikin (University of
Missouri-Columbia), B. Mashhoon (University of Missouri-Columbia), F. Ricci
(University of Rome) | On the Gravitomagnetic Time Delay | 15 pages, 1 figure, revised version submitted to Phys. Lett. A | Phys.Lett. A308 (2003) 101-109 | 10.1016/S0375-9601(02)01804-2 | null | gr-qc astro-ph | null | We study the gravitational time delay in ray propagation due to rotating
masses in the linear approximation of general relativity. Simple expressions
are given for the gravitomagnetic time delay that occurs when rays of radiation
cross a slowly rotating shell and propagate in the field of a distant rotating
source. M... | [
{
"created": "Fri, 4 Oct 2002 22:11:08 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Dec 2002 02:19:58 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ciufolini",
"I.",
"",
"University of Lecce"
],
[
"Kopeikin",
"S.",
"",
"University of\n Missouri-Columbia"
],
[
"Mashhoon",
"B.",
"",
"University of Missouri-Columbia"
],
[
"Ricci",
"F.",
"",
"University of Rome"
]
] | We study the gravitational time delay in ray propagation due to rotating masses in the linear approximation of general relativity. Simple expressions are given for the gravitomagnetic time delay that occurs when rays of radiation cross a slowly rotating shell and propagate in the field of a distant rotating source. Mor... |
1104.1865 | Stoytcho Yazadjiev | Stoytcho S. Yazadjiev | Exact dark energy star solutions | 8 pages, LaTex; v2 comments and references added, typos corrected | Phys.Rev.D83:127501,2011 | 10.1103/PhysRevD.83.127501 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Adopting the phantom (ghost) scalar field description of dark energy, we
construct a general class of exact interior solutions describing mixed
relativistic stars containing both ordinary matter and dark energy in different
proportions. The exterior solution that continuously matches the interior
solutions is found. ... | [
{
"created": "Mon, 11 Apr 2011 07:43:23 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jun 2011 06:54:36 GMT",
"version": "v2"
}
] | 2011-06-24 | [
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | Adopting the phantom (ghost) scalar field description of dark energy, we construct a general class of exact interior solutions describing mixed relativistic stars containing both ordinary matter and dark energy in different proportions. The exterior solution that continuously matches the interior solutions is found. Ex... |
1211.1131 | Madhavan Venkatesh | Madhavan Venkatesh | A Construct of Dynamics, Space and Gravity from Loops | Some claims incorrect | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An attempt is made to construct space and obtain dynamics from Loop Algebras
and their elements. We define three new products between loops namely 'Vertical
Product', 'Horizontal Product' and 'Total Product'. As for the dynamics, we
obtain corresponding "velocity" and "canonical momenta" from it. Also, we build
a new... | [
{
"created": "Tue, 6 Nov 2012 07:49:04 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Jan 2022 11:13:59 GMT",
"version": "v2"
}
] | 2022-02-01 | [
[
"Venkatesh",
"Madhavan",
""
]
] | An attempt is made to construct space and obtain dynamics from Loop Algebras and their elements. We define three new products between loops namely 'Vertical Product', 'Horizontal Product' and 'Total Product'. As for the dynamics, we obtain corresponding "velocity" and "canonical momenta" from it. Also, we build a new "... |
gr-qc/0305077 | Mircea Beciu | M. I. Beciu | Noncommutative Cosmology | LATEX, 7 pages, one Appendix | null | null | null | gr-qc | null | We show that the cosmological large number coincidence can be interpreted as
giving the filling factor in a Landau problem. The analogy with the Landau
problem leads naturally to the noncommutativity of the gravitational and matter
degrees of freedom. We present a toy model that supports this view. We discuss
some of... | [
{
"created": "Tue, 20 May 2003 15:05:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Beciu",
"M. I.",
""
]
] | We show that the cosmological large number coincidence can be interpreted as giving the filling factor in a Landau problem. The analogy with the Landau problem leads naturally to the noncommutativity of the gravitational and matter degrees of freedom. We present a toy model that supports this view. We discuss some of t... |
2211.05620 | Emanuel Gallo | Gast\'on Briozzo, Emanuel Gallo and Thomas M\"adler | Shadows of rotating black holes in plasma environments with aberration
effects | Several improvements, new graphics, and discussions. Accepted in PRD | null | 10.1103/PhysRevD.107.124004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The shadows of black holes encode significant information about the
properties of black holes and the spacetime surrounding them. So far, the
effects of dispersive media, such as plasma, and relativistic aberration on the
propagation of light around compact objects have been treated separately in the
literature. In t... | [
{
"created": "Thu, 10 Nov 2022 14:52:31 GMT",
"version": "v1"
},
{
"created": "Mon, 22 May 2023 22:09:41 GMT",
"version": "v2"
}
] | 2023-06-21 | [
[
"Briozzo",
"Gastón",
""
],
[
"Gallo",
"Emanuel",
""
],
[
"Mädler",
"Thomas",
""
]
] | The shadows of black holes encode significant information about the properties of black holes and the spacetime surrounding them. So far, the effects of dispersive media, such as plasma, and relativistic aberration on the propagation of light around compact objects have been treated separately in the literature. In thi... |
2310.05700 | Cameron Bunney | Cameron R. D. Bunney, Leo Parry, T. Rick Perche, Jorma Louko | Ambient temperature versus ambient acceleration in the circular motion
Unruh effect | 19 pages, 3 figures. v2: sections 2 and 6 expanded after referee
comments. v3: typos corrected. v4: added post-publication note | Phys. Rev. D 109, 065001 (2024) | 10.1103/PhysRevD.109.065001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that the experience of a linearly accelerated observer with
acceleration $a$, interacting with a massless scalar field in its vacuum state
in $3+1$ Minkowski spacetime, is identical to that of a static observer
interacting with a massless scalar field in a thermal state of temperature
$a/2\pi$ in $3+... | [
{
"created": "Mon, 9 Oct 2023 13:21:23 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Feb 2024 22:47:56 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Mar 2024 10:17:08 GMT",
"version": "v3"
},
{
"created": "Fri, 22 Mar 2024 15:52:18 GMT",
"version": "v4"
}
] | 2024-03-25 | [
[
"Bunney",
"Cameron R. D.",
""
],
[
"Parry",
"Leo",
""
],
[
"Perche",
"T. Rick",
""
],
[
"Louko",
"Jorma",
""
]
] | It is well known that the experience of a linearly accelerated observer with acceleration $a$, interacting with a massless scalar field in its vacuum state in $3+1$ Minkowski spacetime, is identical to that of a static observer interacting with a massless scalar field in a thermal state of temperature $a/2\pi$ in $3+1$... |
gr-qc/0509009 | Jian Qi Shen | Jian Qi Shen | Nonanalytic metric in the presence of gravitomagnetic monopoles | 5 pages, no figures. Keywords: Gravitomagnetic monopole; Nonanalytic
metric; Dual curvature tensors; cosmological constant | Phys.Lett.A340:12-17,2005 | 10.1016/j.physleta.2005.03.058 | null | gr-qc | null | The nonanalytic property of metric resulting from the presence of
gravitomagnetic monopoles is considered. The curvature tensors, dual curvature
tensors, dual Einstein tensor (and hence the gravitational field equation of
gravitomagnetic matter) expressed in terms of nonanalytic metric are analyzed.
It is shown that ... | [
{
"created": "Thu, 1 Sep 2005 19:08:07 GMT",
"version": "v1"
}
] | 2009-09-01 | [
[
"Shen",
"Jian Qi",
""
]
] | The nonanalytic property of metric resulting from the presence of gravitomagnetic monopoles is considered. The curvature tensors, dual curvature tensors, dual Einstein tensor (and hence the gravitational field equation of gravitomagnetic matter) expressed in terms of nonanalytic metric are analyzed. It is shown that th... |
gr-qc/9808033 | Jeeva S. Anandan | Jeeva Anandan | Quantum Measurement Problem and the Possible Role of the Gravitational
Field | 22 pages, latex, no figures | Found.Phys. 29 (1999) 333-348 | null | null | gr-qc hep-th quant-ph | null | The quantum measurement problem and various unsuccessful attempts to resolve
it are reviewed. A suggestion by Diosi and Penrose for the half life of the
quantum superposition of two Newtonian gravitational fields is generalized to
an arbitrary quantum superposition of relativistic, but weak, gravitational
fields. The... | [
{
"created": "Tue, 11 Aug 1998 19:50:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Anandan",
"Jeeva",
""
]
] | The quantum measurement problem and various unsuccessful attempts to resolve it are reviewed. A suggestion by Diosi and Penrose for the half life of the quantum superposition of two Newtonian gravitational fields is generalized to an arbitrary quantum superposition of relativistic, but weak, gravitational fields. The n... |
1006.1622 | Amos Ori | Amos Ori | Flux-conserving hyperbolic systems and two-dimensional evaporating black
holes | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of semi-linear hyperbolic systems in 1+1 dimensions was investigated
several years ago by Ori and Gorbonos. This class, to which we shall refer as
"flux-conserving systems", exhibits a variety of interesting mathematical
properties. Here we demonstrate how the formalism of flux-conserving systems
can be appli... | [
{
"created": "Tue, 8 Jun 2010 17:40:28 GMT",
"version": "v1"
}
] | 2010-06-09 | [
[
"Ori",
"Amos",
""
]
] | A class of semi-linear hyperbolic systems in 1+1 dimensions was investigated several years ago by Ori and Gorbonos. This class, to which we shall refer as "flux-conserving systems", exhibits a variety of interesting mathematical properties. Here we demonstrate how the formalism of flux-conserving systems can be applied... |
1611.03728 | Yeluripati Rohin | Rohin Kumar | A New Class of Cosmologically `Viable' $f(R)$ Models | Removed IJMPD formatting | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Instead of assuming a form of gravity and demand cosmology fit with $\Lambda
CDM$, a potentially `viable' $f(R)$ gravity model is derived assuming an
alternative model of cosmology. Taking the `designer' approach to $f(R)$, a new
class of solutions are derived starting with linear coasting cosmology in which
scale fa... | [
{
"created": "Thu, 10 Nov 2016 06:17:04 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Nov 2016 15:05:52 GMT",
"version": "v2"
},
{
"created": "Sun, 14 Jan 2018 19:13:24 GMT",
"version": "v3"
}
] | 2018-01-16 | [
[
"Kumar",
"Rohin",
""
]
] | Instead of assuming a form of gravity and demand cosmology fit with $\Lambda CDM$, a potentially `viable' $f(R)$ gravity model is derived assuming an alternative model of cosmology. Taking the `designer' approach to $f(R)$, a new class of solutions are derived starting with linear coasting cosmology in which scale fact... |
0806.2930 | Galliano Valent | Galliano Valent | Bianchi III and V Einstein metrics | latex 2e, 15 pages, no figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present diagonal Einstein metrics for Bianchi III and V, both for
minkowskian and euclidean signatures and we show that the Einstein Bianchi III
metrics have an integrable geodesic flow.
| [
{
"created": "Wed, 18 Jun 2008 09:00:17 GMT",
"version": "v1"
}
] | 2008-06-19 | [
[
"Valent",
"Galliano",
""
]
] | We present diagonal Einstein metrics for Bianchi III and V, both for minkowskian and euclidean signatures and we show that the Einstein Bianchi III metrics have an integrable geodesic flow. |
1108.1782 | Je-An Gu | Je-An Gu, Wei-Ting Lin | Solar-System Constraints on f(R) Chameleon Gravity | 12 pages | null | null | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the solar-system constraint on the f(R) theory of modified
gravity with chameleon mechanism, where f(R) represents the deviation from
general relativity in the gravity action. We obtain a stringent bound to a
general, non-constant deviation function f(R): -10^{-15} < df/dR < 0 when R ~
3*10^5*H0^2, and... | [
{
"created": "Mon, 8 Aug 2011 19:05:50 GMT",
"version": "v1"
}
] | 2011-08-09 | [
[
"Gu",
"Je-An",
""
],
[
"Lin",
"Wei-Ting",
""
]
] | We investigate the solar-system constraint on the f(R) theory of modified gravity with chameleon mechanism, where f(R) represents the deviation from general relativity in the gravity action. We obtain a stringent bound to a general, non-constant deviation function f(R): -10^{-15} < df/dR < 0 when R ~ 3*10^5*H0^2, and a... |
1702.03567 | Ramon Torres | R. Torres | Non-singular quantum improved rotating black holes and their maximal
extension | 21 pages, 7 figures. Added references, comments and improved figures | Gen. Relativ. Gravit. (2017) 49: 74 | 10.1007/s10714-017-2236-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We add a prescription to the Newman-Janis algorithm in order to use it as a
means of finding new extended (`through r<0') rotating black hole spacetimes
from static spherically symmetric ones. Then, we apply the procedure to a
quantum improved black hole spacetime coming from Quantum Einstein Gravity. The
goal is to ... | [
{
"created": "Sun, 12 Feb 2017 20:10:46 GMT",
"version": "v1"
},
{
"created": "Tue, 16 May 2017 16:41:11 GMT",
"version": "v2"
}
] | 2017-05-17 | [
[
"Torres",
"R.",
""
]
] | We add a prescription to the Newman-Janis algorithm in order to use it as a means of finding new extended (`through r<0') rotating black hole spacetimes from static spherically symmetric ones. Then, we apply the procedure to a quantum improved black hole spacetime coming from Quantum Einstein Gravity. The goal is to ge... |
gr-qc/0203028 | Eugen Paal | E. Paal | Operadic curvature as a tool for gravity | LaTeX2e, 6 pages | null | null | null | gr-qc | null | The deformation equation and its integrability condition (Bianchi identity)
of a non-associative deformation in operad algebra are found. Their relation to
the theory of gravity is discussed.
| [
{
"created": "Sun, 10 Mar 2002 09:27:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Paal",
"E.",
""
]
] | The deformation equation and its integrability condition (Bianchi identity) of a non-associative deformation in operad algebra are found. Their relation to the theory of gravity is discussed. |
gr-qc/9306012 | Neil Cornish | N. J. Cornish and N. E. Frankel | Gravitation vs. Rotation in 2+1 Dimensions | 11 pages, UM-P-93/43 & UTPT-93-10 | Class.Quant.Grav.11:723,1994 | 10.1088/0264-9381/11/3/022 | null | gr-qc hep-th | null | We investigate rotation and rotating structures in (2+1)-dimensional Einstein
gravity. We show that rotation generally leads to pathological physical
situations.
| [
{
"created": "Tue, 8 Jun 1993 17:10:39 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Sep 1993 20:44:27 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Cornish",
"N. J.",
""
],
[
"Frankel",
"N. E.",
""
]
] | We investigate rotation and rotating structures in (2+1)-dimensional Einstein gravity. We show that rotation generally leads to pathological physical situations. |
1908.02145 | Claus Gerhardt | Claus Gerhardt | Applications of canonical quantum gravity to cosmology | 17 pages | Symmetry 11 (2019), 1005 | 10.3390/sym11081005 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply quantum gravitational results to spatially unbounded Friedmann
universes and try to answer some questions related to dark energy, dark matter,
inflation and the missing antimatter.
| [
{
"created": "Sat, 3 Aug 2019 14:19:25 GMT",
"version": "v1"
}
] | 2019-08-08 | [
[
"Gerhardt",
"Claus",
""
]
] | We apply quantum gravitational results to spatially unbounded Friedmann universes and try to answer some questions related to dark energy, dark matter, inflation and the missing antimatter. |
1005.2286 | Laszlo Arpad Gergely | Zsolt Horv\'ath, L\'aszl\'o \'Arp\'ad Gergely, David Hobill | Image formation in weak gravitational lensing by tidal charged black
holes | v2: 24 pages, 3 figures + 4 figure panels; new Appendix comparing our
and the Virbhadra-Ellis lens equation; new figure pointing out the different
behaviour of the ratios of the magnifications in terms of image separation
for the tidal charge dominated and Schwarzschild black holes | Class.Quant.Grav.27:235006,2010 | 10.1088/0264-9381/27/23/235006 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a generic weak lensing equation and apply it for the study of
images produced by tidal charged brane black holes. We discuss the similarities
and point out the differences with respect to the Schwarzschild black hole weak
lensing, to both first and second order accuracy, when either the mass or the
tidal ch... | [
{
"created": "Thu, 13 May 2010 09:49:06 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Dec 2010 11:45:25 GMT",
"version": "v2"
}
] | 2010-12-13 | [
[
"Horváth",
"Zsolt",
""
],
[
"Gergely",
"László Árpád",
""
],
[
"Hobill",
"David",
""
]
] | We derive a generic weak lensing equation and apply it for the study of images produced by tidal charged brane black holes. We discuss the similarities and point out the differences with respect to the Schwarzschild black hole weak lensing, to both first and second order accuracy, when either the mass or the tidal char... |
0806.0916 | Vyacheslav Ivanovich Dokuchaev | E. O. Babichev, V. I. Dokuchaev, Yu. N. Eroshenko | Perfect fluid and scalar field in the Reissner-Nordstrom metric | 10 pages, 5 figures; title changed, results unchanged | J.Exp.Theor.Phys. 112:784-793,2011 | 10.1134/S1063776111040157 | null | gr-qc astro-ph | http://creativecommons.org/licenses/by/3.0/ | We describe spherically symmetric steady-state accretion of perfect fluid in
the Reissner-Nordstrom metric. We present analytic solutions for accretion of a
fluid with the linear equations of state and of the Chaplygin gas. It is also
shown that, under reasonable physical conditions, there is no steady-state
accretio... | [
{
"created": "Thu, 5 Jun 2008 07:28:54 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jun 2008 17:05:45 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Sep 2008 19:33:19 GMT",
"version": "v3"
},
{
"created": "Mon, 6 Jun 2011 08:02:24 GMT",
"version": "v4"
}
] | 2011-06-20 | [
[
"Babichev",
"E. O.",
""
],
[
"Dokuchaev",
"V. I.",
""
],
[
"Eroshenko",
"Yu. N.",
""
]
] | We describe spherically symmetric steady-state accretion of perfect fluid in the Reissner-Nordstrom metric. We present analytic solutions for accretion of a fluid with the linear equations of state and of the Chaplygin gas. It is also shown that, under reasonable physical conditions, there is no steady-state accretion ... |
gr-qc/0511090 | Andre Fuzfa | A. Fuzfa, J.-M. Alimi | Non-Abelian Einstein-Born-Infeld-Dilaton Cosmology | 31 pages, 9 figures, minor changes, accepted for publication in Phys.
Rev. D15 | Phys.Rev.D73:023520,2006 | 10.1103/PhysRevD.73.023520 | null | gr-qc astro-ph hep-ph hep-th | null | The non-abelian Einstein-Born-Infeld-Dilaton theory, which rules the dynamics
of tensor-scalar gravitation coupled to a $su(2)$-valued gauge field ruled by
Born-Infeld lagrangian, is studied in a cosmological framework. The microscopic
energy exchange between the gauge field and the dilaton which results from a
non-u... | [
{
"created": "Wed, 16 Nov 2005 15:05:56 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jan 2006 16:17:20 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Fuzfa",
"A.",
""
],
[
"Alimi",
"J. -M.",
""
]
] | The non-abelian Einstein-Born-Infeld-Dilaton theory, which rules the dynamics of tensor-scalar gravitation coupled to a $su(2)$-valued gauge field ruled by Born-Infeld lagrangian, is studied in a cosmological framework. The microscopic energy exchange between the gauge field and the dilaton which results from a non-uni... |
2306.15453 | Mohsen Fathi | Mohsen Fathi, J.R. Villanueva, Norman Cruz | Spherical particle orbits around a rotating black hole in massive
gravity | 20 pages, 19 figures, 2 tables | Symmetry 2023, 15(8), 1485 | 10.3390/sym15081485 | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | In this paper, we present a rotating de Rham-Gabadadze-Tolley black hole with
a positive cosmological constant in massive gravity, achieved by applying a
modified Newman-Janis algorithm. The black hole exhibits stable orbits of
constant radii, prompting a numerical study on the behavior of the solutions to
a nonic eq... | [
{
"created": "Tue, 27 Jun 2023 13:17:20 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jun 2023 14:26:43 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Jul 2023 15:55:48 GMT",
"version": "v3"
}
] | 2023-07-28 | [
[
"Fathi",
"Mohsen",
""
],
[
"Villanueva",
"J. R.",
""
],
[
"Cruz",
"Norman",
""
]
] | In this paper, we present a rotating de Rham-Gabadadze-Tolley black hole with a positive cosmological constant in massive gravity, achieved by applying a modified Newman-Janis algorithm. The black hole exhibits stable orbits of constant radii, prompting a numerical study on the behavior of the solutions to a nonic equa... |
1406.3666 | Alfredo Sandoval-Villalbazo | A. L. Garcia-Perciante, H. Mondragon-Suarez, D. Brun-Battistini, A.
Sandoval-Villalbazo | On the stability problem in relativistic thermodynamics: implications of
the Chapman-Enskog formalism | The authors wish to avoid some posible overlap with arXiv:1104.0858 | null | 10.1007/s10955-015-1272-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extended theories are widely used in the literature to describe relativistic
fluids. The motivation for this is mostly due to the causality issues allegedly
present in the first order in the gradients theories. However, the decay of
fluctuations in the system is also at stake when first order theories that
couple hea... | [
{
"created": "Fri, 13 Jun 2014 23:17:02 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Feb 2015 01:57:18 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Garcia-Perciante",
"A. L.",
""
],
[
"Mondragon-Suarez",
"H.",
""
],
[
"Brun-Battistini",
"D.",
""
],
[
"Sandoval-Villalbazo",
"A.",
""
]
] | Extended theories are widely used in the literature to describe relativistic fluids. The motivation for this is mostly due to the causality issues allegedly present in the first order in the gradients theories. However, the decay of fluctuations in the system is also at stake when first order theories that couple heat ... |
1003.3753 | Herrmann Joachim | Joachim Herrmann | Diffusion in the general theory of relativity | 10 pages, no figures | Phys.Rev.D82:024026,2010 | 10.1103/PhysRevD.82.024026 | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Markovian diffusion theory in the phase space is generalized within the
framework of the general theory of relativity. The introduction of moving
orthonormal frame vectors both for the position as well the velocity space
enables to bypass difficulties in the general relativistic stochastic calculus.
The general r... | [
{
"created": "Fri, 19 Mar 2010 09:29:58 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Herrmann",
"Joachim",
""
]
] | The Markovian diffusion theory in the phase space is generalized within the framework of the general theory of relativity. The introduction of moving orthonormal frame vectors both for the position as well the velocity space enables to bypass difficulties in the general relativistic stochastic calculus. The general rel... |
1712.08798 | Kun Meng | Kun Meng, Da-Bao Yang | Black holes of dimensionally continued gravity coupled to Born-Infeld
electromagnetic field | 18 pages, 5 figures | Phys.Lett. B780 (2018) 363-371 | 10.1016/j.physletb.2018.03.032 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, for dimensionally continued gravity coupled to Born-Infeld
electromagnetic field, we construct topological black holes in diverse
dimensions and construct dyonic black holes in general even dimensions. We
study thermodynamics of the black holes and obtain first laws. We study thermal
phase transitions ... | [
{
"created": "Sat, 23 Dec 2017 16:15:06 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Dec 2017 01:38:28 GMT",
"version": "v2"
},
{
"created": "Sun, 31 Dec 2017 11:16:51 GMT",
"version": "v3"
},
{
"created": "Fri, 23 Mar 2018 07:18:51 GMT",
"version": "v4"
}
] | 2018-03-26 | [
[
"Meng",
"Kun",
""
],
[
"Yang",
"Da-Bao",
""
]
] | In this paper, for dimensionally continued gravity coupled to Born-Infeld electromagnetic field, we construct topological black holes in diverse dimensions and construct dyonic black holes in general even dimensions. We study thermodynamics of the black holes and obtain first laws. We study thermal phase transitions of... |
2311.08818 | Georgios Lukes-Gerakopoulos | Michal Straten\'y and Georgios Lukes-Gerakopoulos | Growth of orbital resonances around a black hole surrounded by matter | 11 pages, 3 figures, 1 table, Proceedings of RAGtime 23-25. Edited by
Z. Stuchl\'ik, G. T\"or\"ok and V. Karas. Institute of Physics in Opava | null | null | null | gr-qc astro-ph.HE nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work studies the dynamics of geodesic motion within a curved spacetime
around a Schwarzschild black hole, perturbed by a gravitational field of a far
axisymmetric distribution of mass enclosing the system. This spacetime can
serve as a versatile model for a diverse range of astrophysical scenarios and,
in partic... | [
{
"created": "Wed, 15 Nov 2023 09:44:36 GMT",
"version": "v1"
}
] | 2023-11-16 | [
[
"Stratený",
"Michal",
""
],
[
"Lukes-Gerakopoulos",
"Georgios",
""
]
] | This work studies the dynamics of geodesic motion within a curved spacetime around a Schwarzschild black hole, perturbed by a gravitational field of a far axisymmetric distribution of mass enclosing the system. This spacetime can serve as a versatile model for a diverse range of astrophysical scenarios and, in particul... |
1604.06932 | Shreya Banerjee | Shreya Banerjee (Tata Inst.), Emmanuel N. Saridakis (Valparaiso U.,
Catolica & Baylor U.) | Bounce and cyclic cosmology in weakly broken galileon theories | 28 pages, 6 figures,version published in Phys. Rev. D | Phys. Rev. D 95, 063523 (2017) | 10.1103/PhysRevD.95.063523 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the bounce and cyclicity realization in the framework of
weakly broken galileon theories. We study bouncing and cyclic solutions at the
background level, reconstructing the potential and the galileon functions that
can give rise to a given scale factor, and presenting analytical expressions
for the bou... | [
{
"created": "Sat, 23 Apr 2016 18:20:25 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Apr 2017 06:11:37 GMT",
"version": "v2"
}
] | 2017-04-07 | [
[
"Banerjee",
"Shreya",
"",
"Tata Inst."
],
[
"Saridakis",
"Emmanuel N.",
"",
"Valparaiso U.,\n Catolica & Baylor U."
]
] | We investigate the bounce and cyclicity realization in the framework of weakly broken galileon theories. We study bouncing and cyclic solutions at the background level, reconstructing the potential and the galileon functions that can give rise to a given scale factor, and presenting analytical expressions for the bounc... |
gr-qc/0405081 | Farhad Darabi | F. Darabi | Dynamical generation of space-time signature by spontaneous symmetry
breaking | 11 pages, 3 figures, abstract and text changed, references added | null | null | null | gr-qc hep-th | null | The problem of dynamical generation of 4-D space-time signature at small
scales and its stabilization towards Lorentzian signature at large scales is
studied in the context of Higgs mechanism in a two-time scenario. It is also
shown that Lorentz invariance at small scales can be violated but at large
space-time scale... | [
{
"created": "Sun, 16 May 2004 12:29:10 GMT",
"version": "v1"
},
{
"created": "Tue, 18 May 2004 21:06:01 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Jul 2005 10:55:42 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Darabi",
"F.",
""
]
] | The problem of dynamical generation of 4-D space-time signature at small scales and its stabilization towards Lorentzian signature at large scales is studied in the context of Higgs mechanism in a two-time scenario. It is also shown that Lorentz invariance at small scales can be violated but at large space-time scales ... |
gr-qc/9411048 | Relativity Group | Chiang-Mei Chen, James M. Nester and Roh Suan Tung | Quasilocal Energy-Momentum for Geometric Gravity Theories | 10 pages, latex (with elsart.sty), revised text with same results, to
appear in Phys.Lett.A | Phys.Lett. A203 (1995) 5-11 | 10.1016/0375-9601(95)92844-T | NCU-GR-95-QEMGT | gr-qc | null | From a covariant Hamiltonian formulation, using symplectic ideas, we obtain
covariant quasilocal energy-momentum boundary expressions for general gravity
theories. The expressions depend upon which variables are fixed on the
boundary, a reference configuration and a displacement vector field. We
consider applications... | [
{
"created": "Fri, 18 Nov 1994 14:29:29 GMT",
"version": "v1"
},
{
"created": "Thu, 25 May 1995 10:04:27 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Chen",
"Chiang-Mei",
""
],
[
"Nester",
"James M.",
""
],
[
"Tung",
"Roh Suan",
""
]
] | From a covariant Hamiltonian formulation, using symplectic ideas, we obtain covariant quasilocal energy-momentum boundary expressions for general gravity theories. The expressions depend upon which variables are fixed on the boundary, a reference configuration and a displacement vector field. We consider applications t... |
2111.00818 | Gihyuk Cho | Gihyuk Cho, Subhajit Dandapat and Achamveedu Gopakumar | Third order post-Newtonian gravitational radiation from two-body
scattering: Instantaneous energy and angular momentum radiation | null | Phys. Rev. D 105, 084018 (2022) | 10.1103/PhysRevD.105.084018 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We compute the third post-Newtonian (3PN) accurate instantaneous
contributions to the radiated gravitational wave (GW) energy and angular
momentum arising from the hyperbolic passages of non-spinning compact objects.
The present computations employ 3PN-accurate instantaneous contributions to the
far-zone energy and a... | [
{
"created": "Mon, 1 Nov 2021 10:44:53 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Nov 2021 07:16:10 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Apr 2022 10:32:47 GMT",
"version": "v3"
}
] | 2022-04-21 | [
[
"Cho",
"Gihyuk",
""
],
[
"Dandapat",
"Subhajit",
""
],
[
"Gopakumar",
"Achamveedu",
""
]
] | We compute the third post-Newtonian (3PN) accurate instantaneous contributions to the radiated gravitational wave (GW) energy and angular momentum arising from the hyperbolic passages of non-spinning compact objects. The present computations employ 3PN-accurate instantaneous contributions to the far-zone energy and ang... |
1901.09331 | Ya-Peng Hu | Hongsheng Zhang, Ya-Peng Hu, Yi Zhang | Towards a sound massive cosmology | 21 pages, 3 figures, version accepted by Physics of the Dark Universe | Phys.Dark Univ.23(2019),100257 | 10.1016/j.dark.2018.100257 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that de Rham-Gabadadze-Tolley (dRGT) massive gravity does not
permit a homogeneous and isotropic universe with flat or spherical spatial
metrics. We demonstrate that a singular reference metric solves this problem in
an economic and straightforward way. In the dRGT massive gravity with a
singular referenc... | [
{
"created": "Sun, 27 Jan 2019 07:17:49 GMT",
"version": "v1"
}
] | 2019-01-29 | [
[
"Zhang",
"Hongsheng",
""
],
[
"Hu",
"Ya-Peng",
""
],
[
"Zhang",
"Yi",
""
]
] | It is known that de Rham-Gabadadze-Tolley (dRGT) massive gravity does not permit a homogeneous and isotropic universe with flat or spherical spatial metrics. We demonstrate that a singular reference metric solves this problem in an economic and straightforward way. In the dRGT massive gravity with a singular reference ... |
gr-qc/0407085 | Takahiro Tanaka | Oriol Pujolas, Takahiro Tanaka | Massless scalar fields and infrared divergences in the inflationary
brane world | 20 pages. References added | JCAP 0412 (2004) 009 | 10.1088/1475-7516/2004/12/009 | YITP-04-38, KUNS-1927 | gr-qc hep-th | null | We study the quantum effects induced by bulk scalar fields in a model with a
de Sitter (dS) brane in a flat bulk (the Vilenkin-Ipser-Sikivie model) in more
than four dimensions. In ordinary dS space, it is well known that the stress
tensor in the dS invariant vacuum for an effectively massless scalar
($m_\eff^2=m^2+\... | [
{
"created": "Fri, 23 Jul 2004 04:12:40 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Aug 2004 06:53:29 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Oct 2004 02:10:22 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Pujolas",
"Oriol",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | We study the quantum effects induced by bulk scalar fields in a model with a de Sitter (dS) brane in a flat bulk (the Vilenkin-Ipser-Sikivie model) in more than four dimensions. In ordinary dS space, it is well known that the stress tensor in the dS invariant vacuum for an effectively massless scalar ($m_\eff^2=m^2+\xi... |
1711.04234 | Andrew DeBenedictis | Jos\'e Tom\'as G\'alvez Ghersi, Michael J. Desrochers, Mason Protter,
Andrew DeBenedictis | Hamiltonian consistency of the gravitational constraint algebra under
deformations | 21 pages, 4 figures. Some details of the more complicated
calculations may be found at https://github.com/josegalvez/HD-GR | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The importance of the first-class constraint algebra of general relativity is
not limited just by its self-contained description of the gauge nature of
spacetime, but it also provides conditions to properly evolve the geometry by
selecting a gauge only once throughout the whole evolution of a gravitational
system. Th... | [
{
"created": "Sun, 12 Nov 2017 04:17:02 GMT",
"version": "v1"
}
] | 2017-11-15 | [
[
"Ghersi",
"José Tomás Gálvez",
""
],
[
"Desrochers",
"Michael J.",
""
],
[
"Protter",
"Mason",
""
],
[
"DeBenedictis",
"Andrew",
""
]
] | The importance of the first-class constraint algebra of general relativity is not limited just by its self-contained description of the gauge nature of spacetime, but it also provides conditions to properly evolve the geometry by selecting a gauge only once throughout the whole evolution of a gravitational system. This... |
2203.00507 | Sourav Chowdhury Roy | Sourav Roy Chowdhury and Maxim Khlopov | An eccentric binary blackhole in post-Newtonian theory | null | Symmetry, 2022 | 10.3390/sym14030510 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves radiated during binary black hole coalescence is a
perfect probe for studying the characteristics of strong gravity. Advanced
techniques for creating numerical relativity substitute models for eccentric
binary black hole systems are presumed to become more crucial in existing and
anticipated gravi... | [
{
"created": "Tue, 1 Mar 2022 14:52:47 GMT",
"version": "v1"
}
] | 2022-03-08 | [
[
"Chowdhury",
"Sourav Roy",
""
],
[
"Khlopov",
"Maxim",
""
]
] | Gravitational waves radiated during binary black hole coalescence is a perfect probe for studying the characteristics of strong gravity. Advanced techniques for creating numerical relativity substitute models for eccentric binary black hole systems are presumed to become more crucial in existing and anticipated gravita... |
2407.04609 | A. S. Lemos | A. S. Lemos, J. A. V. Campos, F. A. Brito | Hunting for extra dimensions in black hole shadows | Latex, 18 pages, 4 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observational data of the Sagittarius A* (Sgr A*) shadow released by the
Event Horizon Telescope (EHT) are used to investigate eventual deviations in
the black hole shadow radius, aiming to seek physics beyond the Standard Model
(SM) coming from extra-dimensional theory. We consider the brane-world scenario
described... | [
{
"created": "Fri, 5 Jul 2024 16:00:48 GMT",
"version": "v1"
}
] | 2024-07-08 | [
[
"Lemos",
"A. S.",
""
],
[
"Campos",
"J. A. V.",
""
],
[
"Brito",
"F. A.",
""
]
] | Observational data of the Sagittarius A* (Sgr A*) shadow released by the Event Horizon Telescope (EHT) are used to investigate eventual deviations in the black hole shadow radius, aiming to seek physics beyond the Standard Model (SM) coming from extra-dimensional theory. We consider the brane-world scenario described b... |
1201.3769 | Hristu Culetu | Hristu Culetu | On the time dependent Schwarzschild - de Sitter spacetime | 8 pages, no figures, Sections 3 and 5 enlarged, one reference added | null | 10.1088/1742-6596/437/1/012005 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An imperfect cosmic fluid with energy flux is analyzed. Even though its
energy density $\rho$ is positive, the pressure $p = -\rho$ due to the fact
that the metric is asymptotically de Sitter. The kinematical quantities for a
nongeodesic congruence are computed. The scalar expansion is time independent
but divergent ... | [
{
"created": "Wed, 18 Jan 2012 12:25:01 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Feb 2012 14:08:39 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Mar 2012 16:45:56 GMT",
"version": "v3"
}
] | 2015-06-03 | [
[
"Culetu",
"Hristu",
""
]
] | An imperfect cosmic fluid with energy flux is analyzed. Even though its energy density $\rho$ is positive, the pressure $p = -\rho$ due to the fact that the metric is asymptotically de Sitter. The kinematical quantities for a nongeodesic congruence are computed. The scalar expansion is time independent but divergent at... |
2210.17075 | Siddheshwar Kadam | S. A. Kadam, Jackson Levi Said, B. Mishra | Accelerating Cosmological Models in $f(T, B)$ Gravitational Theory | 13 Pages, 9 figures | IIJGMMP, 20, 2350083, 2023 | 10.1142/S0219887823500834 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have explored the field equations of f(T, B) gravity as an
extension of teleparallel gravity in an isotropic and homogeneous space time.
In the basic formalism developed, the dynamical parameters are derived by
incorporating the power law and exponential scale factor function. The models
are showing... | [
{
"created": "Mon, 31 Oct 2022 05:42:51 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Jun 2023 06:11:28 GMT",
"version": "v2"
}
] | 2023-06-13 | [
[
"Kadam",
"S. A.",
""
],
[
"Said",
"Jackson Levi",
""
],
[
"Mishra",
"B.",
""
]
] | In this paper, we have explored the field equations of f(T, B) gravity as an extension of teleparallel gravity in an isotropic and homogeneous space time. In the basic formalism developed, the dynamical parameters are derived by incorporating the power law and exponential scale factor function. The models are showing a... |
2009.02944 | Shun Jiang | Shun Jiang | Absorption Process and Weak Cosmic Censorship Conjecture In Kerr Black
hole | 9 pages ,language and presentation improved, reference added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the Weak Cosmic Censorship Conjecture in nearly
extremal Kerr black hole by absorbing particles . In previous work, they ignore
the process of black hole absorbing particles. They assume the whole particle
can be absorbed and the overspinning occurs. However, it is questionable
whether t... | [
{
"created": "Mon, 7 Sep 2020 08:45:03 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 2020 07:43:19 GMT",
"version": "v2"
}
] | 2020-09-17 | [
[
"Jiang",
"Shun",
""
]
] | In this paper, we investigate the Weak Cosmic Censorship Conjecture in nearly extremal Kerr black hole by absorbing particles . In previous work, they ignore the process of black hole absorbing particles. They assume the whole particle can be absorbed and the overspinning occurs. However, it is questionable whether the... |
1512.03808 | Casey Cartwright | Casey Cartwright, Alex Flournoy | Background-Independence from the Perspective of Gauge Theory | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider two concepts often discussed as significant features of general
relativity (particularly when contrasted with the other forces of the Standard
Model): background independence and diffeomorphism invariance. We remind the
reader of the role of backgrounds both as calculational tools and as part of
the formu... | [
{
"created": "Fri, 11 Dec 2015 20:59:52 GMT",
"version": "v1"
}
] | 2015-12-14 | [
[
"Cartwright",
"Casey",
""
],
[
"Flournoy",
"Alex",
""
]
] | We consider two concepts often discussed as significant features of general relativity (particularly when contrasted with the other forces of the Standard Model): background independence and diffeomorphism invariance. We remind the reader of the role of backgrounds both as calculational tools and as part of the formula... |
gr-qc/0508007 | Rovelli Carlo | Federico Mattei, Carlo Rovelli (CPT), Simone Speziale, Massimo Testa | From 3-geometry transition amplitudes to graviton states | 18 pages | Nucl.Phys. B739 (2006) 234-253 | 10.1016/j.nuclphysb.2006.01.026 | null | gr-qc | null | In various background independent approaches, quantum gravity is defined in
terms of a field propagation kernel: a sum over paths interpreted as a
transition amplitude between 3-geometries, expected to project quantum states
of the geometry on the solutions of the Wheeler-DeWitt equation. We study the
relation betwee... | [
{
"created": "Mon, 1 Aug 2005 14:55:13 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Feb 2006 09:01:12 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Mattei",
"Federico",
"",
"CPT"
],
[
"Rovelli",
"Carlo",
"",
"CPT"
],
[
"Speziale",
"Simone",
""
],
[
"Testa",
"Massimo",
""
]
] | In various background independent approaches, quantum gravity is defined in terms of a field propagation kernel: a sum over paths interpreted as a transition amplitude between 3-geometries, expected to project quantum states of the geometry on the solutions of the Wheeler-DeWitt equation. We study the relation between ... |
1210.7747 | Christian Corda cordac | Christian Corda | Black hole quantum spectrum | 22 pages, definitive version accepted for publication in European
Physical Journal C. The results of arXiv:1205.5251 have been reviewed and
refined | Eur. Phys. J. C 73, 2665 (2013) | 10.1140/epjc/s10052-013-2665-6 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Introducing a black hole (BH) effective temperature, which takes into account
both the non-strictly thermal character of Hawking radiation and the countable
behavior of emissions of subsequent Hawking quanta, we recently re-analysed BH
quasi-normal modes (QNMs) and interpreted them naturally in terms of quantum
level... | [
{
"created": "Fri, 26 Oct 2012 10:25:11 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Nov 2012 10:47:15 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Jan 2013 18:04:39 GMT",
"version": "v3"
},
{
"created": "Fri, 22 Mar 2013 14:55:10 GMT",
"version": "v4"
},
{
"cr... | 2014-03-03 | [
[
"Corda",
"Christian",
""
]
] | Introducing a black hole (BH) effective temperature, which takes into account both the non-strictly thermal character of Hawking radiation and the countable behavior of emissions of subsequent Hawking quanta, we recently re-analysed BH quasi-normal modes (QNMs) and interpreted them naturally in terms of quantum levels.... |
gr-qc/0605045 | Yuri Obukhov | Yuri N. Obukhov and Guillermo F. Rubilar | Covariance properties and regularization of conserved currents in tetrad
gravity | 36 pages, Revtex, no figures; small changes, published version | Phys.Rev.D73:124017,2006 | 10.1103/PhysRevD.73.124017 | IFT-P.015/2006 | gr-qc astro-ph hep-th | null | We discuss the properties of the gravitational energy-momentum 3-form within
the tetrad formulation of general relativity theory. We derive the covariance
properties of the quantities describing the energy-momentum content under
Lorentz transformations of the tetrad. As an application, we consider the
computation of ... | [
{
"created": "Mon, 8 May 2006 21:43:33 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jun 2006 23:11:14 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Obukhov",
"Yuri N.",
""
],
[
"Rubilar",
"Guillermo F.",
""
]
] | We discuss the properties of the gravitational energy-momentum 3-form within the tetrad formulation of general relativity theory. We derive the covariance properties of the quantities describing the energy-momentum content under Lorentz transformations of the tetrad. As an application, we consider the computation of th... |
1108.5486 | David Nichols | David A. Nichols, Robert Owen, Fan Zhang, Aaron Zimmerman, Jeandrew
Brink, Yanbei Chen, Jeffrey D. Kaplan, Geoffrey Lovelace, Keith D. Matthews,
Mark A. Scheel, Kip S. Thorne | Visualizing Spacetime Curvature via Frame-Drag Vortexes and Tidal
Tendexes I. General Theory and Weak-Gravity Applications | 25 pages, 20 figures, matches the published version | Phys. Rev. D 84, 124014 (2011) | 10.1103/PhysRevD.84.124014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When one splits spacetime into space plus time, the Weyl curvature tensor
(vacuum Riemann tensor) gets split into two spatial, symmetric, and trace-free
(STF) tensors: (i) the Weyl tensor's so-called "electric" part or tidal field,
and (ii) the Weyl tensor's so-called "magnetic" part or frame-drag field. Being
STF, t... | [
{
"created": "Sun, 28 Aug 2011 01:53:54 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Feb 2012 07:59:11 GMT",
"version": "v2"
}
] | 2012-02-02 | [
[
"Nichols",
"David A.",
""
],
[
"Owen",
"Robert",
""
],
[
"Zhang",
"Fan",
""
],
[
"Zimmerman",
"Aaron",
""
],
[
"Brink",
"Jeandrew",
""
],
[
"Chen",
"Yanbei",
""
],
[
"Kaplan",
"Jeffrey D.",
""
],
[
... | When one splits spacetime into space plus time, the Weyl curvature tensor (vacuum Riemann tensor) gets split into two spatial, symmetric, and trace-free (STF) tensors: (i) the Weyl tensor's so-called "electric" part or tidal field, and (ii) the Weyl tensor's so-called "magnetic" part or frame-drag field. Being STF, the... |
2311.02981 | Pravin Dahal | Pravin K. Dahal, Swayamsiddha Maharana, Fil Simovic, Daniel R. Terno | Horizon-bound objects: Kerr-Vaidya solutions | 18 pages, 5 figures. Minor edits. Comments welcome! | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The formation of horizons in finite time according to distant observers
results in a number of remarkable properties of the objects they bound. Subject
to this requirement, spherically-symmetric black holes can only decrease in
mass, while white holes can only expand. We provide a detailed analysis of the
latter scen... | [
{
"created": "Mon, 6 Nov 2023 09:33:06 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Apr 2024 10:55:54 GMT",
"version": "v2"
}
] | 2024-04-23 | [
[
"Dahal",
"Pravin K.",
""
],
[
"Maharana",
"Swayamsiddha",
""
],
[
"Simovic",
"Fil",
""
],
[
"Terno",
"Daniel R.",
""
]
] | The formation of horizons in finite time according to distant observers results in a number of remarkable properties of the objects they bound. Subject to this requirement, spherically-symmetric black holes can only decrease in mass, while white holes can only expand. We provide a detailed analysis of the latter scenar... |
2010.02859 | Olivier Sarbach | Emmanuel Chavez Nambo and Olivier Sarbach | Static spherical perfect fluid stars with finite radius in general
relativity: a review | 26 pages, 4 figures. Typos corrected and references added | Revista Mexicana de Fisica E18, 020208, 1-20, 2021 | 10.31349/RevMexFisE.18.020208 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we provide a pedagogical review of the
Tolman-Oppenheimer-Volkoff (TOV) equation and its solutions which describe
static, spherically symmetric gaseous stars in general relativity. Our
discussion starts with a systematic derivation of the TOV equation from the
Einstein field equations and the relativ... | [
{
"created": "Tue, 6 Oct 2020 16:25:46 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Jun 2021 05:07:32 GMT",
"version": "v2"
}
] | 2021-06-15 | [
[
"Nambo",
"Emmanuel Chavez",
""
],
[
"Sarbach",
"Olivier",
""
]
] | In this article, we provide a pedagogical review of the Tolman-Oppenheimer-Volkoff (TOV) equation and its solutions which describe static, spherically symmetric gaseous stars in general relativity. Our discussion starts with a systematic derivation of the TOV equation from the Einstein field equations and the relativis... |
gr-qc/0102006 | Roberto Casadio | Roberto Casadio | On time evolution of quantum black holes | LaTeX using elsart.sty, 10 pages, 3 EPS figures | Phys.Lett. B511 (2001) 285-290 | 10.1016/S0370-2693(01)00634-7 | null | gr-qc astro-ph hep-th | null | The time evolution of black holes involves both the canonical equations of
quantum gravity and the statistical mechanics of Hawking radiation, neither of
which contains a time variable. In order to introduce the time, we apply the
semiclassical approximation to the Hamiltonian constraint on the apparent
horizon and s... | [
{
"created": "Fri, 2 Feb 2001 14:04:51 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Casadio",
"Roberto",
""
]
] | The time evolution of black holes involves both the canonical equations of quantum gravity and the statistical mechanics of Hawking radiation, neither of which contains a time variable. In order to introduce the time, we apply the semiclassical approximation to the Hamiltonian constraint on the apparent horizon and sho... |
1810.05185 | Andrea Giugno | R. Casadio, A. Giugno, A.Giusti, M. Lenzi | Quantum Formation of Primordial Black holes | RevTeX, 5 pages, 2 figures | null | 10.1007/s10714-019-2587-1 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a (simplified) quantum description of primordial black holes at
the time of their formation. Specifically, we employ the horizon quantum
mechanics to compute the probability of black hole formation starting from a
simple quantum mechanical characterization of primordial density fluctuations
given by a Plan... | [
{
"created": "Thu, 11 Oct 2018 18:05:39 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jul 2019 13:45:47 GMT",
"version": "v2"
}
] | 2019-09-04 | [
[
"Casadio",
"R.",
""
],
[
"Giugno",
"A.",
""
],
[
"Giusti",
"A.",
""
],
[
"Lenzi",
"M.",
""
]
] | We provide a (simplified) quantum description of primordial black holes at the time of their formation. Specifically, we employ the horizon quantum mechanics to compute the probability of black hole formation starting from a simple quantum mechanical characterization of primordial density fluctuations given by a Planck... |
1809.06608 | Seyyed Shahrokh Assyyaee | Sh. Assyyaee, N. Riazi | Phantom Origin for f(R) Inflation | There is a mathematical misinterpretation in the paper | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that for $f(R)=R+\alpha R^n$ model of the early universe, the de
Sitter point appears as partial attractor for phantom paths. The phantom
trajectories then bend their way to the oscillatory period passing near the de
Sitter saddle point. Surprisingly, this vicinity is minimized for $1<n\le 3$
where a traject... | [
{
"created": "Tue, 18 Sep 2018 09:22:29 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Sep 2018 09:35:38 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Feb 2019 14:55:17 GMT",
"version": "v3"
}
] | 2019-02-08 | [
[
"Assyyaee",
"Sh.",
""
],
[
"Riazi",
"N.",
""
]
] | We argue that for $f(R)=R+\alpha R^n$ model of the early universe, the de Sitter point appears as partial attractor for phantom paths. The phantom trajectories then bend their way to the oscillatory period passing near the de Sitter saddle point. Surprisingly, this vicinity is minimized for $1<n\le 3$ where a trajector... |
0906.4933 | Murli Manohar Verma | Murli Manohar Verma | Avoidance of Singularity and Global Non-Conservation of Energy in
General Relativity | 10 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the singularity in the General Theory of Relativity (GTR) is the
expression of a non-Machian feature. It can be avoided with a scale-invariant
dynamical theory, a property lacking in GTR. It is further argued that the
global non-conservation of energy in GTR also results from the lack of
scale-invariance... | [
{
"created": "Fri, 26 Jun 2009 13:38:58 GMT",
"version": "v1"
}
] | 2009-06-29 | [
[
"Verma",
"Murli Manohar",
""
]
] | We show that the singularity in the General Theory of Relativity (GTR) is the expression of a non-Machian feature. It can be avoided with a scale-invariant dynamical theory, a property lacking in GTR. It is further argued that the global non-conservation of energy in GTR also results from the lack of scale-invariance a... |
gr-qc/0610012 | Giampiero Esposito Dr. | Alfio Bonanno, Giampiero Esposito, Claudio Rubano, Paolo Scudellaro | Noether symmetry approach in pure gravity with variable G and Lambda | 18 pages, 2 figures. In the final version, physical interpretation
and presentation have been improved in all sections | Class.Quant.Grav.24:1443-1455,2007 | 10.1088/0264-9381/24/6/005 | DSF preprint 2006/30 | gr-qc | null | We find exact cosmological solutions when the Newton parameter and the
cosmological term are dynamically evolving in a renormalization-group improved
Hamiltonian approach. In our derivation we use the Noether symmetry approach,
leading to an interesting variable transformation which yields exact and
general integrati... | [
{
"created": "Tue, 3 Oct 2006 15:49:47 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Feb 2007 17:11:41 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bonanno",
"Alfio",
""
],
[
"Esposito",
"Giampiero",
""
],
[
"Rubano",
"Claudio",
""
],
[
"Scudellaro",
"Paolo",
""
]
] | We find exact cosmological solutions when the Newton parameter and the cosmological term are dynamically evolving in a renormalization-group improved Hamiltonian approach. In our derivation we use the Noether symmetry approach, leading to an interesting variable transformation which yields exact and general integration... |
2012.02209 | Lucy Thomas | Lucy M. Thomas, Patricia Schmidt, Geraint Pratten | New effective precession spin for modeling multimodal gravitational
waveforms in the strong-field regime | Matches version published in Phys. Rev. D. 23 pages (incl. appendices
and bibliography), 17 figures | Phys. Rev. D 103, 083022 (2021) | 10.1103/PhysRevD.103.083022 | LIGO-DCC P2000509 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accurately modelling the complete gravitational-wave signal from precessing
binary black holes through the late inspiral, merger and ringdown remains a
challenging problem. The lack of analytic solutions for the precession dynamics
of generic double-spin systems, and the high dimensionality of the problem,
obfuscate ... | [
{
"created": "Thu, 3 Dec 2020 19:00:07 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2021 20:03:56 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Apr 2021 23:29:45 GMT",
"version": "v3"
}
] | 2021-05-05 | [
[
"Thomas",
"Lucy M.",
""
],
[
"Schmidt",
"Patricia",
""
],
[
"Pratten",
"Geraint",
""
]
] | Accurately modelling the complete gravitational-wave signal from precessing binary black holes through the late inspiral, merger and ringdown remains a challenging problem. The lack of analytic solutions for the precession dynamics of generic double-spin systems, and the high dimensionality of the problem, obfuscate th... |
1910.00561 | G. Dautcourt | G. Dautcourt | Vacuum gravitational fields with a null Killing vector | 13 pages, v2: abstract extended, typos corrected, minor changes, v3:
reviewer suggestions considered | Gen Relativ Gravit (2020) 52: 10 | 10.1007/s10714-020-2661-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vacuum gravitational fields admitting a light-like Killing field were
systematically studied starting around 1960. Besides the already known plane
waves, a second class of gravitational wave fields was found. In contrast to
plane waves, their wave surfaces were not flat, but had a negative Gaussian
curvature. Recentl... | [
{
"created": "Tue, 1 Oct 2019 17:35:48 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Oct 2019 10:29:34 GMT",
"version": "v2"
},
{
"created": "Sun, 29 Dec 2019 09:51:21 GMT",
"version": "v3"
}
] | 2020-02-06 | [
[
"Dautcourt",
"G.",
""
]
] | Vacuum gravitational fields admitting a light-like Killing field were systematically studied starting around 1960. Besides the already known plane waves, a second class of gravitational wave fields was found. In contrast to plane waves, their wave surfaces were not flat, but had a negative Gaussian curvature. Recently,... |
1710.00946 | Dejan Stojkovic | De-Chang Dai, Dejan Stojkovic | Inconsistencies in Verlinde's emergent gravity | accepted for publication in JHEP | null | 10.1007/JHEP11(2017)007 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that recent Verlinde's proposal of emergent gravity suffers from
some internal inconsistencies. The main idea in this proposal is to preserve
general relativity at short scales where numerous tests verified its validity,
but modify it on large scales where we meet puzzles raised by observations (in
parti... | [
{
"created": "Tue, 3 Oct 2017 00:45:53 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 2017 20:22:37 GMT",
"version": "v2"
}
] | 2017-12-11 | [
[
"Dai",
"De-Chang",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | We point out that recent Verlinde's proposal of emergent gravity suffers from some internal inconsistencies. The main idea in this proposal is to preserve general relativity at short scales where numerous tests verified its validity, but modify it on large scales where we meet puzzles raised by observations (in particu... |
2005.13651 | Maria De F\'atima Alves da Silva PhD | J. M. Z. Pretel and M. F. A. da Silva | Stability and gravitational collapse of neutron stars with realistic
equations of state | 13 pages, 11 figures | MNRAS, 495 (2020), 5027 | 10.1093/mnras/staa1493 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the stability and construct dynamical configurations describing
the gravitational collapse of unstable neutron stars with realistic equations
of state compatible with the recent LIGO-Virgo constraints. Unlike other works
that consider the collapse of a stellar configuration without a priori
knowledge if it... | [
{
"created": "Wed, 27 May 2020 21:00:47 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jun 2020 11:46:26 GMT",
"version": "v2"
}
] | 2020-06-17 | [
[
"Pretel",
"J. M. Z.",
""
],
[
"da Silva",
"M. F. A.",
""
]
] | We discuss the stability and construct dynamical configurations describing the gravitational collapse of unstable neutron stars with realistic equations of state compatible with the recent LIGO-Virgo constraints. Unlike other works that consider the collapse of a stellar configuration without a priori knowledge if it i... |
gr-qc/9908016 | Carsten Gundlach | D. Garfinkle and C. Gundlach | Symmetry-seeking spacetime coordinates | 10 pages, RevTex, to be published in CQG | Class.Quant.Grav. 16 (1999) 4111-4123 | 10.1088/0264-9381/16/12/325 | null | gr-qc | null | In numerically constructing a spacetime that has an approximate timelike
Killing vector, it is useful to choose spacetime coordinates adapted to the
symmetry, so that the metric and matter variables vary only slowly with time in
these coordinates. In particular, this is a crucial issue in numerically
calculating a bi... | [
{
"created": "Thu, 5 Aug 1999 16:34:30 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Oct 1999 09:46:55 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Garfinkle",
"D.",
""
],
[
"Gundlach",
"C.",
""
]
] | In numerically constructing a spacetime that has an approximate timelike Killing vector, it is useful to choose spacetime coordinates adapted to the symmetry, so that the metric and matter variables vary only slowly with time in these coordinates. In particular, this is a crucial issue in numerically calculating a bina... |
1706.01598 | Zhongwen Feng | Zhong-Wen Feng and Shu-Zheng Yang | Hawking radiation of massive bosons via tunneling from black strings | 8 pages | null | 10.1007/s10773-017-3625-y | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | In the present paper, the Hawking radiation of massive bosons from
4-dimensional and 5-dimensional black strings are studied in quantum tunneling
formalism. Firstly, we derive the Hamilton-Jacobi equation set via the Proca
equation and WKB approximation. Then, the tunneling rates and Hawking
temperature of the black ... | [
{
"created": "Tue, 6 Jun 2017 03:53:13 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jul 2017 09:07:52 GMT",
"version": "v2"
}
] | 2018-01-10 | [
[
"Feng",
"Zhong-Wen",
""
],
[
"Yang",
"Shu-Zheng",
""
]
] | In the present paper, the Hawking radiation of massive bosons from 4-dimensional and 5-dimensional black strings are studied in quantum tunneling formalism. Firstly, we derive the Hamilton-Jacobi equation set via the Proca equation and WKB approximation. Then, the tunneling rates and Hawking temperature of the black st... |
1007.1493 | Aron Wall | Aron C. Wall | A proof of the generalized second law for rapidly-evolving Rindler
horizons | 16 pages, 2 figures. v2 edited abstract | Phys.Rev.D82:124019,2010 | 10.1103/PhysRevD.82.124019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The generalized second law is proven for rapidly-evolving semiclassical
Rindler horizons at each instant of time, for arbitrary interacting quantum
fields minimally coupled to general relativity. The proof requires the
background spacetime to have boost and null translation symmetry. Possible
extensions to more gener... | [
{
"created": "Fri, 9 Jul 2010 02:02:31 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jul 2010 05:17:23 GMT",
"version": "v2"
}
] | 2010-12-24 | [
[
"Wall",
"Aron C.",
""
]
] | The generalized second law is proven for rapidly-evolving semiclassical Rindler horizons at each instant of time, for arbitrary interacting quantum fields minimally coupled to general relativity. The proof requires the background spacetime to have boost and null translation symmetry. Possible extensions to more general... |
gr-qc/0201035 | Hongwei Yu | Hongwei Yu | Decay of massive scalar hair in the background of a black hole with a
global monopole | Revtex, 10 pages, References added, to appear in Phys. Rev. D | Phys.Rev.D65:087502,2002 | 10.1103/PhysRevD.65.087502 | null | gr-qc | null | The late-time tail behaviors of massive scalar fields are examined
analytically in the background of a black hole with a global monopole. It is
found that the presence of a solid deficit angle in the background metric makes
the massive scalar fields decay faster in the intermediate times. However, the
asymptotically ... | [
{
"created": "Fri, 11 Jan 2002 02:01:38 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jan 2002 13:46:52 GMT",
"version": "v2"
}
] | 2011-08-11 | [
[
"Yu",
"Hongwei",
""
]
] | The late-time tail behaviors of massive scalar fields are examined analytically in the background of a black hole with a global monopole. It is found that the presence of a solid deficit angle in the background metric makes the massive scalar fields decay faster in the intermediate times. However, the asymptotically la... |
0905.4949 | Alejandro Corichi | Alejandro Corichi and Parampreet Singh | A geometric perspective on singularity resolution and uniqueness in loop
quantum cosmology | 17 pages, no figures. Typos corrected. Minor changes. Version to be
published in PRD | Phys.Rev.D80:044024,2009 | 10.1103/PhysRevD.80.044024 | IGC-09/5-3, PI-QG-134 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We re-examine the issue of singularity resolution in homogeneous loop quantum
cosmology from the perspective of geometrical entities such as expansion rate
and the shear scalar. These quantities are very reliable measures of the
properties of spacetime and can be defined not only at the classical and
effective level,... | [
{
"created": "Fri, 29 May 2009 19:21:00 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Jul 2009 03:44:34 GMT",
"version": "v2"
}
] | 2009-09-01 | [
[
"Corichi",
"Alejandro",
""
],
[
"Singh",
"Parampreet",
""
]
] | We re-examine the issue of singularity resolution in homogeneous loop quantum cosmology from the perspective of geometrical entities such as expansion rate and the shear scalar. These quantities are very reliable measures of the properties of spacetime and can be defined not only at the classical and effective level, b... |
0908.2836 | Todd Oliynyk | Todd A. Oliynyk | Cosmological post-Newtonian expansions to arbitrary order | null | Commun.Math.Phys.295:431-463,2010 | 10.1007/s00220-009-0931-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the existence of a large class of one parameter families of
solutions to the Einstein-Euler equations that depend on the singular parameter
$\ep=v_T/c$ $(0<\ep < \ep_0)$, where $c$ is the speed of light, and $v_T$ is a
typical speed of the gravitating fluid. These solutions are shown to exist on a
common spa... | [
{
"created": "Wed, 19 Aug 2009 23:48:12 GMT",
"version": "v1"
}
] | 2010-02-23 | [
[
"Oliynyk",
"Todd A.",
""
]
] | We prove the existence of a large class of one parameter families of solutions to the Einstein-Euler equations that depend on the singular parameter $\ep=v_T/c$ $(0<\ep < \ep_0)$, where $c$ is the speed of light, and $v_T$ is a typical speed of the gravitating fluid. These solutions are shown to exist on a common space... |
0802.1867 | David Coule | D.H. Coule | Holography constrains quantum bounce | updated version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent work in quantum loop cosmology suggests the universe undergoes a
bounce when evolving from a previous collapsing phase. However, with
non-inflationary matter sources, the scenario appears to strongly violate the
holography bound S\leq A/4 during the bounce, where A now represents the
cross-sectional area of th... | [
{
"created": "Wed, 13 Feb 2008 17:13:36 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Aug 2010 17:53:04 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Nov 2010 17:07:05 GMT",
"version": "v3"
},
{
"created": "Tue, 18 Dec 2012 19:41:51 GMT",
"version": "v4"
}
] | 2012-12-19 | [
[
"Coule",
"D. H.",
""
]
] | Recent work in quantum loop cosmology suggests the universe undergoes a bounce when evolving from a previous collapsing phase. However, with non-inflationary matter sources, the scenario appears to strongly violate the holography bound S\leq A/4 during the bounce, where A now represents the cross-sectional area of the ... |
gr-qc/9602034 | Gerard Clement | Karim Ait Moussa and G\'erard Cl\'ement | Topologically massive gravito-electrodynamics: exact solutions | 15 pages, LaTeX, no figures | Class.Quant.Grav. 13 (1996) 2319-2328 | 10.1088/0264-9381/13/8/023 | GCR-96/02/07 | gr-qc hep-th | null | We construct two classes of exact solutions to the field equations of
topologically massive electrodynamics coupled to topologically massive gravity
in 2 + 1 dimensions. The self-dual stationary solutions of the first class are
horizonless, asymptotic to the extreme BTZ black-hole metric, and regular for a
suitable p... | [
{
"created": "Fri, 16 Feb 1996 16:51:54 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Moussa",
"Karim Ait",
""
],
[
"Clément",
"Gérard",
""
]
] | We construct two classes of exact solutions to the field equations of topologically massive electrodynamics coupled to topologically massive gravity in 2 + 1 dimensions. The self-dual stationary solutions of the first class are horizonless, asymptotic to the extreme BTZ black-hole metric, and regular for a suitable par... |
1307.1080 | Edward Glass | J.P. Krisch and E.N. Glass | Two Fluid Shear-Free Composites | misprints corrected, J. Math. Physics (to appear) | null | 10.1063/1.4815976 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Shear-free composite fluids are constructed from two Letelier rotated
unaligned perfect fluids. The component fluid parameters necessary to construct
a shear-free composite are investigated. A metric in the Stephani-Barnes
solution family and a simple stationary metric are discussed.
| [
{
"created": "Wed, 3 Jul 2013 17:03:41 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jul 2013 16:51:34 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Krisch",
"J. P.",
""
],
[
"Glass",
"E. N.",
""
]
] | Shear-free composite fluids are constructed from two Letelier rotated unaligned perfect fluids. The component fluid parameters necessary to construct a shear-free composite are investigated. A metric in the Stephani-Barnes solution family and a simple stationary metric are discussed. |
gr-qc/0604028 | Thomas Sotiriou | Thomas P. Sotiriou | f(R) Gravity and scalar-tensor theory | minor changes to match published version, references added | Class.Quant.Grav.23:5117-5128,2006 | 10.1088/0264-9381/23/17/003 | null | gr-qc astro-ph hep-th | null | In the present paper we will investigate the relation between scalar-tensor
theory and $f(R)$ theories of gravity. Such studies have been performed in the
past for the metric formalism of $f(R)$ gravity; here we will consider mainly
the Palatini formalism, where the metric and the connections are treated as
independe... | [
{
"created": "Thu, 6 Apr 2006 17:57:21 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Aug 2006 01:17:17 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Sotiriou",
"Thomas P.",
""
]
] | In the present paper we will investigate the relation between scalar-tensor theory and $f(R)$ theories of gravity. Such studies have been performed in the past for the metric formalism of $f(R)$ gravity; here we will consider mainly the Palatini formalism, where the metric and the connections are treated as independent... |
1203.5291 | Oleg Zaslavskii | O. B. Zaslavskii | High energy particle collisions near the bifurcation surface | 13 pages. Section V on dS spacetime added. Typos corrected, title
slightly changed. Final version | Int. Journ. Mod. Phys. D. 22 (2013) 1350044 | 10.1142/S0218271813500442 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider generic nonextremal stationary dirty black holes. It is shown
that in the vicinity of any bifurcation surface the energy of collision of two
particles in the centre of mass frame can grow unbound. This is a generic
property that, in particular, includes collisions near the inner black hole
horizon analyze... | [
{
"created": "Fri, 23 Mar 2012 16:43:04 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jul 2012 13:47:29 GMT",
"version": "v2"
},
{
"created": "Wed, 8 May 2013 08:50:45 GMT",
"version": "v3"
}
] | 2015-06-04 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We consider generic nonextremal stationary dirty black holes. It is shown that in the vicinity of any bifurcation surface the energy of collision of two particles in the centre of mass frame can grow unbound. This is a generic property that, in particular, includes collisions near the inner black hole horizon analyzed ... |
2307.04556 | Vitalii Vertogradov | Yaghoub Heydarzade, Maxim Misyura and Vitalii Vertogradov | Hairy Kiselev Black Hole Solutions | 25 pages, 9 figures | Phys. Rev. D 108, 044073 (2023) | 10.1103/PhysRevD.108.044073 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | In the realm of astrophysics, black holes exist within nonvacuum cosmological
backgrounds, making it crucial to investigate how these backgrounds influence
the properties of black holes. In this work, we first introduce a novel static
spherically-symmetric exact solution of Einstein field equations representing a
sur... | [
{
"created": "Mon, 10 Jul 2023 13:43:42 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Nov 2023 14:40:22 GMT",
"version": "v2"
}
] | 2023-11-15 | [
[
"Heydarzade",
"Yaghoub",
""
],
[
"Misyura",
"Maxim",
""
],
[
"Vertogradov",
"Vitalii",
""
]
] | In the realm of astrophysics, black holes exist within nonvacuum cosmological backgrounds, making it crucial to investigate how these backgrounds influence the properties of black holes. In this work, we first introduce a novel static spherically-symmetric exact solution of Einstein field equations representing a surro... |
gr-qc/0007020 | Kuiroukidis | A. Kuiroukidis and D. B. Papadopoulos (Thessaloniki) | Exact Inflationary Models and Consequences | 8 pages, 2 figures, LaTeX, Revised form | null | null | null | gr-qc | null | New exact inflationary solutions are presented in the scalar field theory,
minimally coupled to gravity, with a potential term. No use is made of the slow
rollover approximation. The scale factors are completely nonsingular and the
transition to the deccelerating phase is smooth. Moreover, in one of these
models, asy... | [
{
"created": "Tue, 11 Jul 2000 10:45:37 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Sep 2000 10:14:55 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kuiroukidis",
"A.",
"",
"Thessaloniki"
],
[
"Papadopoulos",
"D. B.",
"",
"Thessaloniki"
]
] | New exact inflationary solutions are presented in the scalar field theory, minimally coupled to gravity, with a potential term. No use is made of the slow rollover approximation. The scale factors are completely nonsingular and the transition to the deccelerating phase is smooth. Moreover, in one of these models, asymp... |
gr-qc/0311083 | Norbert Straumann | Norbert Straumann | Dark Energy | 16 pages, Invited talk at the Seventh Hungarian Relativity Workshop,
10-15 August, 2003, Sarospatak, Hungary | null | null | null | gr-qc | null | After some remarks about the history and the mystery of the vacuum energy I
shall review the current evidence for a cosmologically significant nearly
homogeneous exotic energy density with negative pressure (`Dark Energy').
Special emphasis will be put on the recent polarization measurements by WMAP
and their implica... | [
{
"created": "Wed, 26 Nov 2003 15:34:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Straumann",
"Norbert",
""
]
] | After some remarks about the history and the mystery of the vacuum energy I shall review the current evidence for a cosmologically significant nearly homogeneous exotic energy density with negative pressure (`Dark Energy'). Special emphasis will be put on the recent polarization measurements by WMAP and their implicati... |
2309.13511 | De-Chang Dai | De-Chang Dai, Dejan Stojkovic | Shedding new light on the absence of fermionic superradiance and maximal
infalling rate of fermions into a black hole | 6 pages, 3 figures. arXiv admin note: text overlap with
arXiv:2306.17423 | Phys. Rev. D 108 (2023) 084024 | 10.1103/PhysRevD.108.084024 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the complete classification of the bases in the rotating black hole
background we separate superradiance from the Hawking effect. We first find
that there is spontaneous particle creation for fermions by the potential
outside the black hole horizon for the frequencies inside the superradiant
regime, i.e. $\omeg... | [
{
"created": "Sun, 24 Sep 2023 00:17:08 GMT",
"version": "v1"
}
] | 2023-10-17 | [
[
"Dai",
"De-Chang",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | Using the complete classification of the bases in the rotating black hole background we separate superradiance from the Hawking effect. We first find that there is spontaneous particle creation for fermions by the potential outside the black hole horizon for the frequencies inside the superradiant regime, i.e. $\omega<... |
1102.2061 | Pedro Castelo Ferreira Dr. | P. Castelo Ferreira | A heuristic solution for the Pioneer anomaly employing an ELA metric
with dark matter in the outskirts of the Solar system | 10 pages; 1 figure; ver2: included analysis of the equation of state;
number of parameters for ansatz reduced; references added | null | null | null | gr-qc physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering an expanding locally anisotropic (ELA) metric with the Sun as
central mass and the heuristic ansatz for the dimensionless functional exponent
parameter 'alpha=3+alpha_2(r_1)(1-U_Sun)^2' with a linear ansatz
'alpha_2(r_1)=alpha_2^(2.0)+alpha_2^(2.1) r_1' above 20 AU the pioneer anomaly
is fully accounted f... | [
{
"created": "Thu, 10 Feb 2011 09:27:57 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Mar 2011 03:43:30 GMT",
"version": "v2"
}
] | 2015-03-18 | [
[
"Ferreira",
"P. Castelo",
""
]
] | Considering an expanding locally anisotropic (ELA) metric with the Sun as central mass and the heuristic ansatz for the dimensionless functional exponent parameter 'alpha=3+alpha_2(r_1)(1-U_Sun)^2' with a linear ansatz 'alpha_2(r_1)=alpha_2^(2.0)+alpha_2^(2.1) r_1' above 20 AU the pioneer anomaly is fully accounted for... |
0710.2337 | Eyo Ita III | Eyo Eyo Ita III | Instanton representation of Plebanski gravity. Euclidean signature
minisuperspace solution | 12 pages. Accepted by Modern Physics Letters A | Mod. Phys. Lett. A, Vol 27, No. 19 (2012)1250104 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the action for the instanton representation of Plebanski gravity
(IRPG), we construct minisuperspace solutions restricted to diagonal variables.
We have treated the Euclidean signature case with zero cosmological constant,
depicting a gravitational analogy to free particle motion. This paper provides
a testing ... | [
{
"created": "Thu, 11 Oct 2007 23:42:24 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Apr 2008 18:17:49 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Apr 2008 08:26:53 GMT",
"version": "v3"
},
{
"created": "Mon, 11 Jun 2012 11:24:35 GMT",
"version": "v4"
}
] | 2012-06-20 | [
[
"Ita",
"Eyo Eyo",
"III"
]
] | Using the action for the instanton representation of Plebanski gravity (IRPG), we construct minisuperspace solutions restricted to diagonal variables. We have treated the Euclidean signature case with zero cosmological constant, depicting a gravitational analogy to free particle motion. This paper provides a testing gr... |
1510.08205 | Mandar Patil | Mandar Patil, Tomohiro Harada, Ken-ichi Nakao, Pankaj S. Joshi,
Masashi Kimura | Infinite efficiency of collisional Penrose process: Can over-spinning
Kerr geometry be the source of ultra-high-energy cosmic rays and neutrinos ? | 55 pages, 10 figures, section added, authors added, published in PRD | Phys. Rev. D 93, 104015 (2016) | 10.1103/PhysRevD.93.104015 | RUP-15-23 | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The origin of the ultra-high-energy particles we receive on the Earth from
the outer space such as EeV cosmic rays and PeV neutrinos remains an enigma.
All mechanisms known to us currently make use of electromagnetic interaction to
accelerate charged particles. In this paper we propose a mechanism exclusively
based o... | [
{
"created": "Wed, 28 Oct 2015 06:19:06 GMT",
"version": "v1"
},
{
"created": "Tue, 10 May 2016 12:20:41 GMT",
"version": "v2"
}
] | 2016-05-11 | [
[
"Patil",
"Mandar",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Nakao",
"Ken-ichi",
""
],
[
"Joshi",
"Pankaj S.",
""
],
[
"Kimura",
"Masashi",
""
]
] | The origin of the ultra-high-energy particles we receive on the Earth from the outer space such as EeV cosmic rays and PeV neutrinos remains an enigma. All mechanisms known to us currently make use of electromagnetic interaction to accelerate charged particles. In this paper we propose a mechanism exclusively based on ... |
1808.04259 | Raheleh Shojaee | Raheleh Shojaee, Kourosh Nozari and Farhad Darabi | More on the Non-Gaussianity of Perturbations in a Non-Minimal
Inflationary Model | 15 pages, 2 figures | Advances in High Energy Physics, 2343896, 2018 | 10.1155/2018/2343896 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study nonlinear cosmological perturbations and their possible non-Gaussian
character in an extended non-minimal inflation where gravity is coupled
non-minimally to both the scalar field and its derivatives. By expansion of the
action up to the third order, we focus on the non-linearity and non-Gaussianity
of pertu... | [
{
"created": "Mon, 13 Aug 2018 15:26:21 GMT",
"version": "v1"
}
] | 2019-10-09 | [
[
"Shojaee",
"Raheleh",
""
],
[
"Nozari",
"Kourosh",
""
],
[
"Darabi",
"Farhad",
""
]
] | We study nonlinear cosmological perturbations and their possible non-Gaussian character in an extended non-minimal inflation where gravity is coupled non-minimally to both the scalar field and its derivatives. By expansion of the action up to the third order, we focus on the non-linearity and non-Gaussianity of perturb... |
gr-qc/0505037 | Sean Carroll | Sean M. Carroll and Jennifer Chen | Does Inflation Provide Natural Initial Conditions for the Universe? | Submitted to Gravity Research Foundation Essay Competition; based on
hep-th/0410270 | Gen.Rel.Grav.37:1671-1674,2005; Int.J.Mod.Phys.D14:2335-2340,2005 | 10.1142/S0218271805008054 | null | gr-qc astro-ph hep-th | null | If our universe underwent inflation, its entropy during the inflationary
phase was substantially lower than it is today. Because a low-entropy state is
less likely to be chosen randomly than a high-entropy one, inflation is
unlikely to arise through randomly-chosen initial conditions. To resolve this
puzzle, we exami... | [
{
"created": "Mon, 9 May 2005 15:33:29 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Carroll",
"Sean M.",
""
],
[
"Chen",
"Jennifer",
""
]
] | If our universe underwent inflation, its entropy during the inflationary phase was substantially lower than it is today. Because a low-entropy state is less likely to be chosen randomly than a high-entropy one, inflation is unlikely to arise through randomly-chosen initial conditions. To resolve this puzzle, we examine... |
2008.10381 | Kevin E. Cahill | Kevin Cahill | Is the local Lorentz invariance of general relativity implemented by
gauge bosons that have their own Yang-Mills-like action? | This replacement implements the changes mentioned in the erratum
Phys.Rev.D 106 (2022) 2, 029901, 11 pages, 6 figures | Phys. Rev. D 102, 065011 (2020) and erratum Phys.Rev.D 106 (2022)
2, 029901 | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity with fermions has two independent symmetries: general
coordinate invariance and local Lorentz invariance. General coordinate
invariance is implemented by the Levi-Civita connection and by Cartan's tetrads
both of which have as their action the Einstein-Hilbert action. It is suggested
here that loca... | [
{
"created": "Fri, 21 Aug 2020 09:08:35 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2020 06:15:11 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Oct 2022 04:44:29 GMT",
"version": "v3"
}
] | 2022-10-18 | [
[
"Cahill",
"Kevin",
""
]
] | General relativity with fermions has two independent symmetries: general coordinate invariance and local Lorentz invariance. General coordinate invariance is implemented by the Levi-Civita connection and by Cartan's tetrads both of which have as their action the Einstein-Hilbert action. It is suggested here that local ... |
gr-qc/0112016 | Grigori Volovik | G.E. Volovik | Momentum space topology of fermion zero modes on brane | LaTeX file, 8 pages, no figures, version accepted in JETP Letters | Pisma Zh.Eksp.Teor.Fiz. 75 (2002) 63-66; JETP Lett. 75 (2002)
55-58 | 10.1134/1.1466475 | null | gr-qc cond-mat hep-ph | null | We discuss fermion zero modes within the 3+1 brain -- the domain wall between
the two vacua in 4+1 spacetime. We do not assume relativistic invariance in 4+1
spacetime, or any special form of the 4+1 action. The only input is that the
fermions in bulk are fully gapped and are described by nontrivial
momentum-space to... | [
{
"created": "Mon, 10 Dec 2001 09:45:05 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Dec 2001 14:30:57 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Jan 2002 13:08:28 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Volovik",
"G. E.",
""
]
] | We discuss fermion zero modes within the 3+1 brain -- the domain wall between the two vacua in 4+1 spacetime. We do not assume relativistic invariance in 4+1 spacetime, or any special form of the 4+1 action. The only input is that the fermions in bulk are fully gapped and are described by nontrivial momentum-space topo... |
2305.05148 | Abbas Sherif | Seoktae Koh, Abbas M Sherif, Gansukh Tumurtushaa | Existence of gradient CKV and gradient conformally stationary LRS
spacetimes | 15 pages, no figure, moderate modifications of the Introduction and
Discussion sections for clarity, additional references provided and
discussed, accepted for publication in Eur. Phys. J. C | Eur. Phys. J. C 84, 69 (2024) | 10.1140/epjc/s10052-024-12425-1 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we study the existence of gradient (proper) CKVs in locally
rotationally symmetric spacetimes (LRS), those CKVs in the space spanned by the
tangent to observers' congruence and the preferred spatial direction, allowing
us to provide a (partial) characterization of gradient conformally static
(GCSt) LRS ... | [
{
"created": "Tue, 9 May 2023 03:20:50 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Sep 2023 09:12:34 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Jan 2024 04:50:36 GMT",
"version": "v3"
}
] | 2024-02-02 | [
[
"Koh",
"Seoktae",
""
],
[
"Sherif",
"Abbas M",
""
],
[
"Tumurtushaa",
"Gansukh",
""
]
] | In this work, we study the existence of gradient (proper) CKVs in locally rotationally symmetric spacetimes (LRS), those CKVs in the space spanned by the tangent to observers' congruence and the preferred spatial direction, allowing us to provide a (partial) characterization of gradient conformally static (GCSt) LRS so... |
gr-qc/9812082 | Saharyan Aram Azati | A. A. Saharian (Yerevan State University) | Qualitative evolution in higher-loop string cosmology | 35 pages, 9 GIF figures | Class.Quant.Grav.16:2057-2096,1999 | 10.1088/0264-9381/16/6/331 | YSU/98-51 | gr-qc astro-ph hep-th | null | We investigate the evolution of the homogeneous and isotropic universe within
the framework of the effective string gravity with string-loop modifications of
dilaton couplings. In the case of barotropic perfect fluid as a
nongravitational source the set of cosmological equations is presented in the
form of the third-... | [
{
"created": "Wed, 23 Dec 1998 12:46:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Saharian",
"A. A.",
"",
"Yerevan State University"
]
] | We investigate the evolution of the homogeneous and isotropic universe within the framework of the effective string gravity with string-loop modifications of dilaton couplings. In the case of barotropic perfect fluid as a nongravitational source the set of cosmological equations is presented in the form of the third-or... |
2305.15439 | Elisa Maggio | Elisa Maggio | Tests of general relativity in the nonlinear regime: a parametrized
plunge-merger-ringdown waveform model | 2 pages, 1 figure, contribution to the 2023 Gravitation session of
the 57th Rencontres de Moriond | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves provide a unique opportunity to test gravity in the
dynamical and nonlinear regime. We present a parametrized test of general
relativity (GR) that introduces generic deviations to the plunge, merger and
ringdown stages of binary-black-hole coalescences. The novel feature of the
model is that it ca... | [
{
"created": "Tue, 23 May 2023 19:53:40 GMT",
"version": "v1"
}
] | 2023-05-26 | [
[
"Maggio",
"Elisa",
""
]
] | Gravitational waves provide a unique opportunity to test gravity in the dynamical and nonlinear regime. We present a parametrized test of general relativity (GR) that introduces generic deviations to the plunge, merger and ringdown stages of binary-black-hole coalescences. The novel feature of the model is that it can ... |
1310.5350 | Satyabrata Sahu | Satyabrata Sahu, Mandar Patil, D. Narasimha, Pankaj S. Joshi | Time Delay between Relativistic Images as a probe of Cosmic Censorship | 20 pages; 3 figures; 5 tables; updated to published version | Phys. Rev. D 88, 103002 (2013) | 10.1103/PhysRevD.88.103002 | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the time delay between successive relativistic images in
gravitational lensing as a possible discriminator between various collapse end
states and hence as a probe of cosmic censorship. Specifically we consider both
black hole and naked singularity spacetimes admitting photon spheres where an
infinite number... | [
{
"created": "Sun, 20 Oct 2013 17:11:23 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jan 2014 21:52:31 GMT",
"version": "v2"
}
] | 2014-01-10 | [
[
"Sahu",
"Satyabrata",
""
],
[
"Patil",
"Mandar",
""
],
[
"Narasimha",
"D.",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | We study the time delay between successive relativistic images in gravitational lensing as a possible discriminator between various collapse end states and hence as a probe of cosmic censorship. Specifically we consider both black hole and naked singularity spacetimes admitting photon spheres where an infinite number o... |
1008.3319 | Evgeny Sorkin | Evgeny Sorkin | On critical collapse of gravitational waves | 14 pp, 7 figs. v2: added details about the accumulation loci and
error-estimates; to appear in Classical and Quantum Gravity | Class.Quant.Grav.28:025011,2011 | 10.1088/0264-9381/28/2/025011 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An axisymmetric collapse of non-rotating gravitational waves is numerically
investigated in the subcritical regime where no black holes form but where
curvature attains a maximum and decreases, following the dispersion of the
initial wave packet. We focus on a curvature invariant with dimensions of
length, and find t... | [
{
"created": "Thu, 19 Aug 2010 14:59:15 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Dec 2010 23:04:57 GMT",
"version": "v2"
}
] | 2011-01-17 | [
[
"Sorkin",
"Evgeny",
""
]
] | An axisymmetric collapse of non-rotating gravitational waves is numerically investigated in the subcritical regime where no black holes form but where curvature attains a maximum and decreases, following the dispersion of the initial wave packet. We focus on a curvature invariant with dimensions of length, and find tha... |
gr-qc/0512167 | Charles W. Misner | Charles W. Misner (University of Maryland and Albert-Einstein-Institut
Potsdam) | Over the Rainbow: Numerical Relativity beyond Scri+ | 5 pages, no figures; added acknowledgements and references in v2 | null | null | UM-PP-05-54 | gr-qc | null | This is a study of the behavior of wave equations in conformally compactified
spacetimes suited to the use of computational boundaries beyond Scri+. There
light cones may be adjusted for computational convenience and/or Scri+ may be
approximated by a "proto-Scri" spacelike hypersurface just outside a de Sitter
horizo... | [
{
"created": "Fri, 30 Dec 2005 18:23:35 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Mar 2006 03:52:18 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Misner",
"Charles W.",
"",
"University of Maryland and Albert-Einstein-Institut\n Potsdam"
]
] | This is a study of the behavior of wave equations in conformally compactified spacetimes suited to the use of computational boundaries beyond Scri+. There light cones may be adjusted for computational convenience and/or Scri+ may be approximated by a "proto-Scri" spacelike hypersurface just outside a de Sitter horizon.... |
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