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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1912.08712 | Bob Osano | Timothy Oreta and Bob Osano | Post inflationary evolution of inflation-produced, large-scale magnetic
fields using a generalised cosmological Ohm's law and both standard and
modified Maxwell's equations | 25, 1 figure. arXiv admin note: text overlap with arXiv:1412.4806 by
other authors | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In most of the literature on evolution of cosmological magnetic fields, it is
found that large-scale magnetic fields evolve as $B^{2}\propto a^{-4}$
(adiabatic magnetic decay) where $a$ is the cosmological scale factor and $B$
is the cosmological magnetic field. This rapid decay has been considered as the
main obstac... | [
{
"created": "Mon, 16 Dec 2019 22:47:02 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Apr 2020 18:40:59 GMT",
"version": "v2"
}
] | 2020-04-23 | [
[
"Oreta",
"Timothy",
""
],
[
"Osano",
"Bob",
""
]
] | In most of the literature on evolution of cosmological magnetic fields, it is found that large-scale magnetic fields evolve as $B^{2}\propto a^{-4}$ (adiabatic magnetic decay) where $a$ is the cosmological scale factor and $B$ is the cosmological magnetic field. This rapid decay has been considered as the main obstacle... |
1905.13460 | Andrea Maselli | Giuseppe Gnocchi, Andrea Maselli, Tiziano Abdelsalhin, Nicola
Giacobbo, Michela Mapelli | Bounding Alternative Theories of Gravity with Multi-Band GW Observations | Results updated to match the version in press on Phys. Rev. D | Phys. Rev. D 100, 064024 (2019) | 10.1103/PhysRevD.100.064024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the constraints on alternative theories of gravity that can be
determined by multi-band observations of gravitational wave signals emitted
from binary black hole coalescences. We focus on three types of General
Relativity modifications induced by a generalised Brans-Dicke theory, and two
classes of quadratic... | [
{
"created": "Fri, 31 May 2019 08:20:51 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Sep 2019 15:21:08 GMT",
"version": "v2"
}
] | 2019-09-18 | [
[
"Gnocchi",
"Giuseppe",
""
],
[
"Maselli",
"Andrea",
""
],
[
"Abdelsalhin",
"Tiziano",
""
],
[
"Giacobbo",
"Nicola",
""
],
[
"Mapelli",
"Michela",
""
]
] | We study the constraints on alternative theories of gravity that can be determined by multi-band observations of gravitational wave signals emitted from binary black hole coalescences. We focus on three types of General Relativity modifications induced by a generalised Brans-Dicke theory, and two classes of quadratic g... |
gr-qc/0608008 | Farhad Darabi | F. Darabi | Classical and quantum wormholes in a flat $\Lambda$-decaying cosmology | 8 pages, 4 figures, accepted for publication in IJTP | Int.J.Theor.Phys.48:961-968,2009 | 10.1007/s10773-008-9869-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the classical and quantum wormholes for a flat {\it Euclidean}
Friedmann-Robertson-Walker metric with a perfect fluid including an ordinary
matter source plus a source playing the role of dark energy (decaying
cosmological term). It is shown that classical wormholes exist for this model
and the quantum versi... | [
{
"created": "Tue, 1 Aug 2006 12:57:08 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Aug 2006 12:00:03 GMT",
"version": "v2"
},
{
"created": "Sun, 7 Dec 2008 09:09:31 GMT",
"version": "v3"
}
] | 2009-03-24 | [
[
"Darabi",
"F.",
""
]
] | We study the classical and quantum wormholes for a flat {\it Euclidean} Friedmann-Robertson-Walker metric with a perfect fluid including an ordinary matter source plus a source playing the role of dark energy (decaying cosmological term). It is shown that classical wormholes exist for this model and the quantum version... |
gr-qc/0111071 | Robert J. Low | Robert J. Low | Light Sheets and the Covariant Entropy Conjecture | 5 pages, to appear in Classical and Quantum Gravity | Class.Quant.Grav.19:L1,2002 | 10.1088/0264-9381/19/1/101 | null | gr-qc hep-th | null | We examine the holography bound suggested by Bousso in his covariant entropy
conjecture, and argue that it is violated because his notion of light sheet is
too generous. We suggest its replacement by a weaker bound.
| [
{
"created": "Wed, 21 Nov 2001 09:25:19 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Low",
"Robert J.",
""
]
] | We examine the holography bound suggested by Bousso in his covariant entropy conjecture, and argue that it is violated because his notion of light sheet is too generous. We suggest its replacement by a weaker bound. |
gr-qc/9605019 | Franz Embacher | Franz Embacher | On the interpretation of quantum cosmology | 86 pages, LaTeX (no figures); in this replaced version, some issues
in the argumentation are formulated more accurate, references are added. The
most important changes are indicated in the LaTeX-file by %%% CORR/END and
/BEGIN | null | null | UWThPh-1996-22 | gr-qc | null | We formulate a ''minimal'' interpretational scheme for fairly general
(minisuperspace) quantum cosmological models. Admitting as few exact
mathematical structure as is reasonably possible at the fundamental level, we
apply approximate WKB-techniques locally in minisuperspace in order to make
contact with the realm of... | [
{
"created": "Thu, 9 May 1996 10:16:09 GMT",
"version": "v1"
},
{
"created": "Fri, 10 May 1996 12:27:13 GMT",
"version": "v2"
},
{
"created": "Mon, 20 May 1996 13:56:20 GMT",
"version": "v3"
}
] | 2008-02-03 | [
[
"Embacher",
"Franz",
""
]
] | We formulate a ''minimal'' interpretational scheme for fairly general (minisuperspace) quantum cosmological models. Admitting as few exact mathematical structure as is reasonably possible at the fundamental level, we apply approximate WKB-techniques locally in minisuperspace in order to make contact with the realm of p... |
0811.4296 | Miodrag Krmar | Vladan Pankovic, Sima Ciganovic, Rade Glavatovic | A Simple, Approximate Method for Analysis of Kerr-Newman Black Hole
Dynamics and Thermodynamics | 8 pages, no figures | null | 10.2298/SAJ0978039P | Ph-18/11-08 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we present a simple, approximate method for analysis of the
basic dynamical and thermodynamical characteristics of Kerr-Newman black hole.
Instead of the complete dynamics of the black hole self-interaction we consider
only such stable (stationary) dynamical situations determined by condition that
black ... | [
{
"created": "Wed, 26 Nov 2008 13:03:37 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Pankovic",
"Vladan",
""
],
[
"Ciganovic",
"Sima",
""
],
[
"Glavatovic",
"Rade",
""
]
] | In this work we present a simple, approximate method for analysis of the basic dynamical and thermodynamical characteristics of Kerr-Newman black hole. Instead of the complete dynamics of the black hole self-interaction we consider only such stable (stationary) dynamical situations determined by condition that black ho... |
2406.03353 | Davide Batic | Davide Batic and Denys Dutykh | Quasinormal Modes in Noncommutative Schwarzschild Black Holes: A
Spectral Analysis | 18 pages, 1 figure, 11 tables, one reference corrected | Eur. Phys. J. C 84, 622 (2024) | 10.1140/epjc/s10052-024-12981-6 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present a comprehensive analysis of quasinormal modes (QNMs) for
noncommutative geometry-inspired Schwarzschild black holes, encompassing both
non-extreme and extreme cases. By employing a spectral method, we calculate the
QNMs in the context of scalar, electromagnetic, and gravitational
perturbations. Our finding... | [
{
"created": "Wed, 5 Jun 2024 15:10:22 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jun 2024 13:20:32 GMT",
"version": "v2"
}
] | 2024-07-15 | [
[
"Batic",
"Davide",
""
],
[
"Dutykh",
"Denys",
""
]
] | We present a comprehensive analysis of quasinormal modes (QNMs) for noncommutative geometry-inspired Schwarzschild black holes, encompassing both non-extreme and extreme cases. By employing a spectral method, we calculate the QNMs in the context of scalar, electromagnetic, and gravitational perturbations. Our findings ... |
2406.14157 | David Wiltshire | Marco Galoppo, David L. Wiltshire | Exact solutions for differentially rotating galaxies in general
relativity | 5 pages, 2 figures | null | null | null | gr-qc astro-ph.CO astro-ph.GA hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | A class of stationary axisymmetric solutions of Einstein's equations for
isolated differentially rotating dust sources is presented. The low-energy
asymptotic regime is extracted, requiring a self-consistent coupling of
quasilocal energy and angular momentum. The Raychaudhuri equation reduces to a
balance equation, w... | [
{
"created": "Thu, 20 Jun 2024 09:54:18 GMT",
"version": "v1"
}
] | 2024-06-21 | [
[
"Galoppo",
"Marco",
""
],
[
"Wiltshire",
"David L.",
""
]
] | A class of stationary axisymmetric solutions of Einstein's equations for isolated differentially rotating dust sources is presented. The low-energy asymptotic regime is extracted, requiring a self-consistent coupling of quasilocal energy and angular momentum. The Raychaudhuri equation reduces to a balance equation, wit... |
1707.02718 | Orlando Luongo | Orlando Luongo | A thermodynamic approach to holographic dark energy | 13 pages, 3 figures, accepted in Adv. High En. Phys | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a method to relate the holographic minimal information density to
the de Broglie's wavelength at a given universe temperature $T$. To figure this
out, we assume that the thermal length of massive and massless constituents
represents the cut-off scale of the holographic principle. To perform our
analysis, w... | [
{
"created": "Mon, 10 Jul 2017 07:05:02 GMT",
"version": "v1"
}
] | 2017-07-11 | [
[
"Luongo",
"Orlando",
""
]
] | We propose a method to relate the holographic minimal information density to the de Broglie's wavelength at a given universe temperature $T$. To figure this out, we assume that the thermal length of massive and massless constituents represents the cut-off scale of the holographic principle. To perform our analysis, we ... |
2405.15558 | BaoYu Tan | BaoYu Tan | EGUP corrected thermodynamics of RN-AdS black hole with quintessence
matter | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Reissner-Nordstrom anti de Sitter (RN-AdS) black hole, characterized by
electric charge and negative cosmological constant,exhibits a rich
thermodynamics structure. In this paper, we consider the influence of
quintessence, a hypothetical dark energy component with negative pressure. we
have computed the extended gene... | [
{
"created": "Thu, 23 May 2024 15:49:00 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jul 2024 02:12:27 GMT",
"version": "v2"
}
] | 2024-07-09 | [
[
"Tan",
"BaoYu",
""
]
] | Reissner-Nordstrom anti de Sitter (RN-AdS) black hole, characterized by electric charge and negative cosmological constant,exhibits a rich thermodynamics structure. In this paper, we consider the influence of quintessence, a hypothetical dark energy component with negative pressure. we have computed the extended genera... |
gr-qc/9912066 | Draza | Draza Markovic & Stuart Shapiro (University of Illinois at
Urbana-Champaign, Department of Physics) | Gravitational Collapse with a Cosmological Constant | 7 pages, 10 figures; To appear in Phys. Rev. D | Phys.Rev. D61 (2000) 084029 | 10.1103/PhysRevD.61.084029 | null | gr-qc astro-ph | null | We consider the effect of a positive cosmological constant on spherical
gravitational collapse to a black hole for a few simple, analytic cases. We
construct the complete Oppenheimer-Snyder-deSitter (OSdS) spacetime, the
generalization of the Oppenheimer-Snyder solution for collapse from rest of a
homogeneous dust ba... | [
{
"created": "Wed, 15 Dec 1999 23:51:12 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Markovic",
"Draza",
"",
"University of Illinois at\n Urbana-Champaign, Department of Physics"
],
[
"Shapiro",
"Stuart",
"",
"University of Illinois at\n Urbana-Champaign, Department of Physics"
]
] | We consider the effect of a positive cosmological constant on spherical gravitational collapse to a black hole for a few simple, analytic cases. We construct the complete Oppenheimer-Snyder-deSitter (OSdS) spacetime, the generalization of the Oppenheimer-Snyder solution for collapse from rest of a homogeneous dust ball... |
1811.05558 | J. Fernando Abalos | Fernando Abalos and Oscar Reula | On necessary and sufficient conditions for strong hyperbolicity | null | null | 10.1088/1361-6382/ab954c | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study constant-coefficient first order systems of partial
differential equations and give necessary and sufficient conditions for those
systems to have a well posed Cauchy Problem. In many physical applications, due
to the presence of constraints, the number of equations in the PDE system is
larger th... | [
{
"created": "Tue, 13 Nov 2018 22:59:55 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Dec 2019 20:17:09 GMT",
"version": "v2"
}
] | 2021-11-17 | [
[
"Abalos",
"Fernando",
""
],
[
"Reula",
"Oscar",
""
]
] | In this work we study constant-coefficient first order systems of partial differential equations and give necessary and sufficient conditions for those systems to have a well posed Cauchy Problem. In many physical applications, due to the presence of constraints, the number of equations in the PDE system is larger than... |
1412.6200 | P. A. Gonzalez | Ramon Becar, P. A. Gonzalez, Joel Saavedra and Yerko Vasquez | Greybody Factors of Massive Charged Fermionic Fields in a Charged
Two-Dimensional Dilatonic Black Hole | 14 pages and 7 figures. arXiv admin note: substantial text overlap
with arXiv:1404.6023 | null | 10.1140/epjc/s10052-015-3292-1 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study massive charged fermionic perturbations in the background of a
charged two-dimensional dilatonic black hole, and we solve the Dirac equation
analytically. Then, we compute the reflection and transmission coefficients and
the absorption cross section for massive charged fermionic fields, and we show
that the ... | [
{
"created": "Fri, 19 Dec 2014 02:34:24 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Becar",
"Ramon",
""
],
[
"Gonzalez",
"P. A.",
""
],
[
"Saavedra",
"Joel",
""
],
[
"Vasquez",
"Yerko",
""
]
] | We study massive charged fermionic perturbations in the background of a charged two-dimensional dilatonic black hole, and we solve the Dirac equation analytically. Then, we compute the reflection and transmission coefficients and the absorption cross section for massive charged fermionic fields, and we show that the ab... |
gr-qc/9801012 | Piotr Bizon | Piotr Bizo\'n and Tadeusz Chmaj | Critical Collapse of Skyrmions | 4 pages, 5 Postscript figures, RevTex, typos corrected | Phys.Rev.D58:041501,1998 | 10.1103/PhysRevD.58.041501 | null | gr-qc hep-th | null | We study first order phase transitions in the gravitational collapse of
spherically symmetric skyrmions. Static sphaleron solutions are shown to play
the role of critical solutions separating black-hole spacetimes from
no-black-hole spacetimes. In particular, we find a new type of first order
phase transition where s... | [
{
"created": "Tue, 6 Jan 1998 17:24:27 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jan 1998 15:02:28 GMT",
"version": "v2"
}
] | 2010-01-06 | [
[
"Bizoń",
"Piotr",
""
],
[
"Chmaj",
"Tadeusz",
""
]
] | We study first order phase transitions in the gravitational collapse of spherically symmetric skyrmions. Static sphaleron solutions are shown to play the role of critical solutions separating black-hole spacetimes from no-black-hole spacetimes. In particular, we find a new type of first order phase transition where sub... |
1906.02801 | Abdulmajid Osumanu | Ma\"it\'e Dupuis, Florian Girelli, Abdulmajid Osumanu and Wolfgang
Wieland | First-order formulation of teleparallel gravity and dual loop gravity | 13 pages | Class. Quantum Grav. 37 (2020) 085023 | 10.1088/1361-6382/ab7bb7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There are at least two ways to encode gravity into geometry: Einstein's
general theory of relativity (GR) for the metric tensor, and teleparallel
gravity, where torsion as opposed to curvature encodes the dynamics of the
gravitational degrees of freedom. The main purpose of the paper is to explore
the relation betwee... | [
{
"created": "Thu, 6 Jun 2019 20:35:55 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Mar 2020 20:01:59 GMT",
"version": "v2"
}
] | 2020-04-01 | [
[
"Dupuis",
"Maïté",
""
],
[
"Girelli",
"Florian",
""
],
[
"Osumanu",
"Abdulmajid",
""
],
[
"Wieland",
"Wolfgang",
""
]
] | There are at least two ways to encode gravity into geometry: Einstein's general theory of relativity (GR) for the metric tensor, and teleparallel gravity, where torsion as opposed to curvature encodes the dynamics of the gravitational degrees of freedom. The main purpose of the paper is to explore the relation between ... |
1410.2412 | Shahab Shahidi | Zahra Haghani, Nima Khosravi and Shahab Shahidi | The Weyl-Cartan Gauss-Bonnet gravity | 11 pages, 1 figure | Class. Quant Grav. 32 (2015) 215016 | 10.1088/0264-9381/32/21/215016 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider the generalized Gauss-Bonnet action in
$4$-dimensional Weyl-Cartan space-time. In this space-time, the presence of
torsion tensor and Weyl vector implies that the generalized Gauss-Bonnet action
will not be a total derivative in four dimension space-time. It will be shown
that the higher th... | [
{
"created": "Thu, 9 Oct 2014 10:16:06 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Apr 2016 10:45:21 GMT",
"version": "v2"
}
] | 2016-04-19 | [
[
"Haghani",
"Zahra",
""
],
[
"Khosravi",
"Nima",
""
],
[
"Shahidi",
"Shahab",
""
]
] | In this paper, we consider the generalized Gauss-Bonnet action in $4$-dimensional Weyl-Cartan space-time. In this space-time, the presence of torsion tensor and Weyl vector implies that the generalized Gauss-Bonnet action will not be a total derivative in four dimension space-time. It will be shown that the higher than... |
gr-qc/0604083 | Chang Jun Gao | C.J.Gao and S.N.Zhang | Black Holes in Brans-Dicke Theory with a Cosmological Constant | 5 pages | null | null | null | gr-qc | null | Since the Brans-Dicke theory is conformal related to the dilaton gravity
theory, by applying a conformal transformation to the dilaton gravity theory,
we derived the cosmological constant term in the Brans-Dicke theory and the
physical solution of black holes with the cosmological constant. It is found
that, in four ... | [
{
"created": "Thu, 20 Apr 2006 01:36:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gao",
"C. J.",
""
],
[
"Zhang",
"S. N.",
""
]
] | Since the Brans-Dicke theory is conformal related to the dilaton gravity theory, by applying a conformal transformation to the dilaton gravity theory, we derived the cosmological constant term in the Brans-Dicke theory and the physical solution of black holes with the cosmological constant. It is found that, in four di... |
1807.01840 | Kwun Hang Lai | Kwun-Hang Lai, Tjonnie Guang Feng Li | Constraining black-hole horizon effects by LIGO-Virgo detections of
inspiralling binary black holes | 12 pages, 5 figures | Phys. Rev. D 98, 084059 (2018) | 10.1103/PhysRevD.98.084059 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity predicts mass and spin growth of an inspiralling black
hole due to an energy-momentum flux flowing through the black-hole horizon. The
leading-order terms of this horizon flux introduce 2.5 and 3.5 post-Newtonian
corrections to inspiral motions of binary black holes. The corrections may be
measurab... | [
{
"created": "Thu, 5 Jul 2018 04:15:52 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jul 2018 03:10:17 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Sep 2018 02:39:28 GMT",
"version": "v3"
}
] | 2018-11-07 | [
[
"Lai",
"Kwun-Hang",
""
],
[
"Li",
"Tjonnie Guang Feng",
""
]
] | General relativity predicts mass and spin growth of an inspiralling black hole due to an energy-momentum flux flowing through the black-hole horizon. The leading-order terms of this horizon flux introduce 2.5 and 3.5 post-Newtonian corrections to inspiral motions of binary black holes. The corrections may be measurable... |
2303.07736 | Siba Prasad Das Dr. | K. G. Managave, H. A. Redekar, R. B. Kumbhar, S. P. Das and K. Y.
Rajpure | Nearly Static Magnetized Kerr Black-hole in Non-linear Electrodynamics | 9pages, 12 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We have analyzed the thermodynamics of slowly rotating magnetized Kerr
black-hole, with typical spin parameter $a\le 0.1$ (nearly static) in the
background of non-linear electrodynamics. In particular we have studied the
Bekenstein-Hawking entropy, Hawking temperature, angular momentum, specific
heats and identified ... | [
{
"created": "Tue, 14 Mar 2023 09:33:40 GMT",
"version": "v1"
}
] | 2023-03-15 | [
[
"Managave",
"K. G.",
""
],
[
"Redekar",
"H. A.",
""
],
[
"Kumbhar",
"R. B.",
""
],
[
"Das",
"S. P.",
""
],
[
"Rajpure",
"K. Y.",
""
]
] | We have analyzed the thermodynamics of slowly rotating magnetized Kerr black-hole, with typical spin parameter $a\le 0.1$ (nearly static) in the background of non-linear electrodynamics. In particular we have studied the Bekenstein-Hawking entropy, Hawking temperature, angular momentum, specific heats and identified re... |
1803.09933 | Massimiliano Razzano | Massimiliano Razzano, Elena Cuoco | Image-based deep learning for classification of noise transients in
gravitational wave detectors | 25 pages, 8 figures, accepted for publication in Classical and
Quantum Gravity | Razzano, M., and Cuoco, E., 2018, Classical and Quantum Gravity,
Volume 35, Number 9, 2018 | 10.1088/1361-6382/aab793 | null | gr-qc astro-ph.IM cs.CV | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of gravitational waves has inaugurated the era of gravitational
astronomy and opened new avenues for the multimessenger study of cosmic
sources. Thanks to their sensitivity, the Advanced LIGO and Advanced Virgo
interferometers will probe a much larger volume of space and expand the
capability of discove... | [
{
"created": "Tue, 27 Mar 2018 07:23:13 GMT",
"version": "v1"
}
] | 2018-04-05 | [
[
"Razzano",
"Massimiliano",
""
],
[
"Cuoco",
"Elena",
""
]
] | The detection of gravitational waves has inaugurated the era of gravitational astronomy and opened new avenues for the multimessenger study of cosmic sources. Thanks to their sensitivity, the Advanced LIGO and Advanced Virgo interferometers will probe a much larger volume of space and expand the capability of discoveri... |
1801.09574 | Dr. Sudhaker Upadhyay | Sudhaker Upadhyay, Saheb Soroushfar and Reza Saffari | Perturbed thermodynamics and thermodynamic geometry of a static black
hole in $f (R)$ gravity | 16 pages, 16 figures, to appear in MPLA | Modern Physics Letters A 36, 2150212 (2021) | 10.1142/S0217732321502126 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider a static black hole in $f(R)$ gravity. We
recapitulate the expression for corrected thermodynamic entropy of this black
hole due to small fluctuations around equilibrium. Also, we study the
geometrothermodynamics (GTD) of this black hole and investigate the
adaptability of the curvature sca... | [
{
"created": "Fri, 26 Jan 2018 16:39:44 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Sep 2021 13:34:36 GMT",
"version": "v2"
}
] | 2021-11-01 | [
[
"Upadhyay",
"Sudhaker",
""
],
[
"Soroushfar",
"Saheb",
""
],
[
"Saffari",
"Reza",
""
]
] | In this paper, we consider a static black hole in $f(R)$ gravity. We recapitulate the expression for corrected thermodynamic entropy of this black hole due to small fluctuations around equilibrium. Also, we study the geometrothermodynamics (GTD) of this black hole and investigate the adaptability of the curvature scala... |
1710.09581 | Yen-Kheng Lim | Gulmina Zaman Babar, Adil Zaman Babar, and Yen-Kheng Lim | Periodic orbits around a spherically symmetric naked singularity | 14 pages, 7 figures | Phys. Rev. D, 96 084052 (2017) | 10.1103/PhysRevD.96.084052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The motion of time-like test particles in the Fisher/Janis-Newman-Winicour
(F/JNW) spacetime is studied with the Hamiltonian formulation of the geodesic
equations. The spacetime is characterised by its mass parameter $r_g$ and
scalar field parameter $\nu$. The innermost bound and stable circular orbits
are calculated... | [
{
"created": "Thu, 26 Oct 2017 08:26:00 GMT",
"version": "v1"
}
] | 2017-10-27 | [
[
"Babar",
"Gulmina Zaman",
""
],
[
"Babar",
"Adil Zaman",
""
],
[
"Lim",
"Yen-Kheng",
""
]
] | The motion of time-like test particles in the Fisher/Janis-Newman-Winicour (F/JNW) spacetime is studied with the Hamiltonian formulation of the geodesic equations. The spacetime is characterised by its mass parameter $r_g$ and scalar field parameter $\nu$. The innermost bound and stable circular orbits are calculated a... |
1604.07106 | Chen Songbai | Songbai Chen, Mei Wang, Jiliang Jing | Testing gravity of a regular and slowly rotating phantom black hole by
quasi-periodic oscillations | 12 paged, 3 figures, Accepted by CQG for publication | Class. Quantum Grav. 33 (2016) 195002 | 10.1088/0264-9381/33/19/195002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend firstly the regular phantom black hole solution to a slowly
rotating black hole case and find that the phantom field depresses the angular
velocity of the event horizon and suppresses the super-radiation of black hole.
We also probe the dependence of quasi-periodic oscillations frequencies in
relativistic p... | [
{
"created": "Mon, 25 Apr 2016 01:55:19 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Aug 2016 07:52:36 GMT",
"version": "v2"
}
] | 2016-09-20 | [
[
"Chen",
"Songbai",
""
],
[
"Wang",
"Mei",
""
],
[
"Jing",
"Jiliang",
""
]
] | We extend firstly the regular phantom black hole solution to a slowly rotating black hole case and find that the phantom field depresses the angular velocity of the event horizon and suppresses the super-radiation of black hole. We also probe the dependence of quasi-periodic oscillations frequencies in relativistic pre... |
1410.0115 | Vladimir S. Manko | V.S. Manko, J.D. Sanabria-G\'omez | Comment on "Generalized black diholes" | 4 pages, 1 figure; last item of initial version removed at referee's
request | Phys. Rev. D 91: 088501, 2015 | 10.1103/PhysRevD.91.088501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a recent solution published by Cabrera-Munguia et al. is
physically inconsistent since the quantity $\sigma$ it involves does not have a
correct limit $R\to\infty$.
| [
{
"created": "Wed, 1 Oct 2014 06:17:24 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Nov 2015 21:59:54 GMT",
"version": "v2"
}
] | 2015-11-09 | [
[
"Manko",
"V. S.",
""
],
[
"Sanabria-Gómez",
"J. D.",
""
]
] | We show that a recent solution published by Cabrera-Munguia et al. is physically inconsistent since the quantity $\sigma$ it involves does not have a correct limit $R\to\infty$. |
gr-qc/0105076 | Gerald Vones | Gerald Vones | R0 Cosmology ? | 11 pages, 1 figure | null | null | null | gr-qc | null | It is postulated that the action of the FRW-universe is the cosmological term
of Einsteins theory (no curvature term - R0 Cosmology). The expansion equation
emerging from the embedding of this most simple brane world with variable speed
of light is deduced. The universal dimensionless coupling constant of gravity
is ... | [
{
"created": "Mon, 21 May 2001 13:09:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vones",
"Gerald",
""
]
] | It is postulated that the action of the FRW-universe is the cosmological term of Einsteins theory (no curvature term - R0 Cosmology). The expansion equation emerging from the embedding of this most simple brane world with variable speed of light is deduced. The universal dimensionless coupling constant of gravity is ad... |
1204.5331 | Parthasarathi Majumdar | Parthasarathi Majumdar | Critical mass of neutron stars : a new view | 11 Pages Latex 2e, 4 eps figures | null | null | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The issue of the critical mass of neutron stars, with respect to
gravitational collapse to black holes, is reexamined from the perspective of
thermal stability of quantum horizons. Postulating the existence of a tiny,
{\it embryonic}, isolated horizon, hidden deep inside a gravitationally
contracting neutron star, th... | [
{
"created": "Tue, 24 Apr 2012 11:03:25 GMT",
"version": "v1"
}
] | 2012-04-30 | [
[
"Majumdar",
"Parthasarathi",
""
]
] | The issue of the critical mass of neutron stars, with respect to gravitational collapse to black holes, is reexamined from the perspective of thermal stability of quantum horizons. Postulating the existence of a tiny, {\it embryonic}, isolated horizon, hidden deep inside a gravitationally contracting neutron star, the ... |
gr-qc/0610147 | Ying-Qiu Gu | Ying-Qiu Gu | A Cosmological Model with Dark Spinor Source | 13 pages, no figure, to appear in IJMPA | Int.J.Mod.Phys.A22:4667-4678,2007 | 10.1142/S0217751X07037925 | null | gr-qc astro-ph | null | In this paper, we discuss the system of Friedman-Robertson-Walker metric
coupling with massive nonlinear dark spinors in detail, where the thermodynamic
movement of spinors is also taken into account. The results show that, the
nonlinear potential of the spinor field can provide a tiny negative pressure,
which resist... | [
{
"created": "Sun, 29 Oct 2006 11:01:42 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 2006 02:08:55 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Oct 2007 00:41:07 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Gu",
"Ying-Qiu",
""
]
] | In this paper, we discuss the system of Friedman-Robertson-Walker metric coupling with massive nonlinear dark spinors in detail, where the thermodynamic movement of spinors is also taken into account. The results show that, the nonlinear potential of the spinor field can provide a tiny negative pressure, which resists ... |
2006.02189 | Oleg Zaslavskii | O. B. Zaslavskii | Negative energy states in the Reissner-Nordstr\"om metric | 6 pages | Mod. Phys. Lett. A. 36 (2021) 2150120 | 10.1142/S0217732321501200 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider electrogeodesics on which the energy $E<0$ in the
Reissner-Nordstr\"{o}m metric. It is shown that outside the horizon there is
exactly one turning point inside the ergoregion for such particles. This
entails that such a particle passes through an infinite chain of black-white
hole regions or terminates in... | [
{
"created": "Wed, 3 Jun 2020 11:56:12 GMT",
"version": "v1"
}
] | 2021-06-23 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We consider electrogeodesics on which the energy $E<0$ in the Reissner-Nordstr\"{o}m metric. It is shown that outside the horizon there is exactly one turning point inside the ergoregion for such particles. This entails that such a particle passes through an infinite chain of black-white hole regions or terminates in t... |
1001.5349 | Tiberiu Harko | T. Harko | The matter Lagrangian and the energy-momentum tensor in modified gravity
with non-minimal coupling between matter and geometry | 6 pages, accepted for publication in PRD; references added | Phys.Rev.D81:044021,2010 | 10.1103/PhysRevD.81.044021 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that in modified $f(R)$ type gravity models with non-minimal coupling
between matter and geometry, both the matter Lagrangian, and the
energy-momentum tensor, are completely and uniquely determined by the form of
the coupling. This result is obtained by using the variational formulation for
the derivation of ... | [
{
"created": "Fri, 29 Jan 2010 08:11:41 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 2010 07:47:35 GMT",
"version": "v2"
}
] | 2010-05-27 | [
[
"Harko",
"T.",
""
]
] | We show that in modified $f(R)$ type gravity models with non-minimal coupling between matter and geometry, both the matter Lagrangian, and the energy-momentum tensor, are completely and uniquely determined by the form of the coupling. This result is obtained by using the variational formulation for the derivation of th... |
1702.07526 | Luigi Seveso | Luigi Seveso, Valerio Peri, Matteo G.A. Paris | Does universality of free-fall apply to the motion of quantum probes? | poster contribution to the Eighth International Workshop DICE2016
"Spacetime - Matter - Quantum Mechanics", September 12-16, 2016 | null | 10.1088/1742-6596/880/1/012067 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Can quantum-mechanical particles propagating on a fixed spacetime background
be approximated as test bodies satisfying the weak equivalence principle? We
ultimately answer the question in the negative but find that, when universality
of free-fall is assessed locally, a nontrivial agreement between quantum
mechanics a... | [
{
"created": "Fri, 24 Feb 2017 10:22:55 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Seveso",
"Luigi",
""
],
[
"Peri",
"Valerio",
""
],
[
"Paris",
"Matteo G. A.",
""
]
] | Can quantum-mechanical particles propagating on a fixed spacetime background be approximated as test bodies satisfying the weak equivalence principle? We ultimately answer the question in the negative but find that, when universality of free-fall is assessed locally, a nontrivial agreement between quantum mechanics and... |
gr-qc/9806059 | Julio Cesar Fabris | J.C. Fabris (1), R. Kerner (2) and J. Tossa (3) ((1) Departamento de
Fisica, Universidade Federal do Espirito Santo, (2) Laboratoire de
Gravitation et Cosmologie Relativistes, Universite Pierre et Marie Curie, (3)
IMSP, Universite du Benin) | Perturbative analysis of generalized Einstein's theories | 14 pages, Latex file | Int.J.Mod.Phys. D9 (2000) 111-125 | 10.1142/S0218271800000116 | DF/UFES-P003/98 | gr-qc | null | The hypothesis that the energy-momentum tensor of ordinary matter is not
conserved separately, leads to a non-adiabatic expansion and, in many cases, to
an Universe older than usual. This may provide a solution for the entropy and
age problems of the Standard Cosmological Model. We consider two different
theories of ... | [
{
"created": "Fri, 12 Jun 1998 15:06:26 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Fabris",
"J. C.",
""
],
[
"Kerner",
"R.",
""
],
[
"Tossa",
"J.",
""
]
] | The hypothesis that the energy-momentum tensor of ordinary matter is not conserved separately, leads to a non-adiabatic expansion and, in many cases, to an Universe older than usual. This may provide a solution for the entropy and age problems of the Standard Cosmological Model. We consider two different theories of th... |
gr-qc/0505013 | Alfredo Macias | Alfredo Macias, Hernando Quevedo, and Alberto Sanchez | Gowdy $T^3$ Cosmological Models in N=1 Supergravity | 25 pages and 2 figures | null | 10.1063/1.2399683 | null | gr-qc | null | We investigate the canonical quantization of supergravity N=1 in the case of
a midisuperspace described by Gowdy $T^3$ cosmological models. The quantum
constraints are analyzed and the wave function of the universe is derived
explicitly. Unlike the minisuperspace case, we show the existence of physical
states in midi... | [
{
"created": "Tue, 3 May 2005 03:15:50 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Macias",
"Alfredo",
""
],
[
"Quevedo",
"Hernando",
""
],
[
"Sanchez",
"Alberto",
""
]
] | We investigate the canonical quantization of supergravity N=1 in the case of a midisuperspace described by Gowdy $T^3$ cosmological models. The quantum constraints are analyzed and the wave function of the universe is derived explicitly. Unlike the minisuperspace case, we show the existence of physical states in midisu... |
1602.08164 | Changjun Gao | Changjun Gao and You-Gen Shen | Exact solutions in f(R) theory of gravity | 8 pages, 2 figures,accepted by GRG | General Relativity and Gravitation, 48(10), 1-15, 2016 | 10.1007/s10714-016-2128-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find a new method for looking for the static and spherically symmetric
solutions in $F(R)$ theory of gravity. With this method, a number of new
solutions in terms of the analytic functions are obtained. We hope this
investigation may be of some help in the searching for some other solutions in
$F(R)$ theory of gra... | [
{
"created": "Fri, 26 Feb 2016 01:21:45 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2016 10:58:55 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Mar 2016 12:33:35 GMT",
"version": "v3"
},
{
"created": "Tue, 29 Mar 2016 07:13:42 GMT",
"version": "v4"
},
{
"cre... | 2016-09-15 | [
[
"Gao",
"Changjun",
""
],
[
"Shen",
"You-Gen",
""
]
] | We find a new method for looking for the static and spherically symmetric solutions in $F(R)$ theory of gravity. With this method, a number of new solutions in terms of the analytic functions are obtained. We hope this investigation may be of some help in the searching for some other solutions in $F(R)$ theory of gravi... |
gr-qc/0012095 | Vladimir M. Khatsymovsky | V M Khatsymovsky | Continuous matter fields in Regge calculus | 4 pages, LaTeX | Phys.Lett. B504 (2001) 356-358 | 10.1016/S0370-2693(01)00295-7 | null | gr-qc | null | We find that the continuous matter fields are ill-defined in Regge calculus
in the physical 4D theory since the corresponding effective action has infinite
terms unremovable by the UV renormalisation procedure. These terms are
connected with the singular nature of the curvature distribution in Regge
calculus, namely,... | [
{
"created": "Tue, 26 Dec 2000 13:22:49 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Khatsymovsky",
"V M",
""
]
] | We find that the continuous matter fields are ill-defined in Regge calculus in the physical 4D theory since the corresponding effective action has infinite terms unremovable by the UV renormalisation procedure. These terms are connected with the singular nature of the curvature distribution in Regge calculus, namely, w... |
1911.06988 | Zi-Yu Tang | Zi-Yu Tang, Bin Wang, and Eleftherios Papantonopoulos | Exact charged black hole solutions in D-dimensions in f(R) gravity | 25 pages, 4 figures, accepted in EPJC | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Maxwell-f(R) gravity and obtain an exact charged black hole
solution with dynamic curvature in D-dimensions. Considering a spherically
symmetric metric ansatz and without specifying the form of f(R) we fnd a
general black hole solution in D-dimensions. This general black hole solution
can be reduced to th... | [
{
"created": "Sat, 16 Nov 2019 08:15:03 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Apr 2021 09:09:15 GMT",
"version": "v2"
}
] | 2021-04-07 | [
[
"Tang",
"Zi-Yu",
""
],
[
"Wang",
"Bin",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
]
] | We consider Maxwell-f(R) gravity and obtain an exact charged black hole solution with dynamic curvature in D-dimensions. Considering a spherically symmetric metric ansatz and without specifying the form of f(R) we fnd a general black hole solution in D-dimensions. This general black hole solution can be reduced to the ... |
1907.07661 | Jos\'e Domingo Vela Arba\~nil | Jos\'e D. V. Arba\~nil, Geanderson A. Carvalho, Ronaldo V. Lobato,
Rubens M. Marinho Jr. and Manuel Malheiro | Extra dimensions' influence on the equilibrium and radial stability of
strange quark stars | 10 Pages, 8 figures | null | 10.1103/PhysRevD.100.024035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the influence of extra dimensions on the static equilibrium
configurations and stability against radial perturbations. For this purpose, we
solve stellar structure equations and radial perturbation equations, both
modified for a $d$-dimensional spacetime ($d\geq4$) considering that spacetime
outside the ob... | [
{
"created": "Wed, 17 Jul 2019 17:46:34 GMT",
"version": "v1"
}
] | 2019-07-18 | [
[
"Arbañil",
"José D. V.",
""
],
[
"Carvalho",
"Geanderson A.",
""
],
[
"Lobato",
"Ronaldo V.",
""
],
[
"Marinho",
"Rubens M.",
"Jr."
],
[
"Malheiro",
"Manuel",
""
]
] | We analyze the influence of extra dimensions on the static equilibrium configurations and stability against radial perturbations. For this purpose, we solve stellar structure equations and radial perturbation equations, both modified for a $d$-dimensional spacetime ($d\geq4$) considering that spacetime outside the obje... |
gr-qc/0610109 | Dmitri Burlankov E | D. Burlankov | "Dark energy" as conformal dynamics of space | 2 pages | null | null | null | gr-qc | null | The exact solution for dynamic of conform-flat space homogeneous since
dynamic equation is given. Conform mode of space metric changing in Global time
theory has negative energy density. Swap of energy to this mode from another
ones lead to increasing of Universe homogeneity although probability of this
swap from loc... | [
{
"created": "Mon, 23 Oct 2006 07:58:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burlankov",
"D.",
""
]
] | The exact solution for dynamic of conform-flat space homogeneous since dynamic equation is given. Conform mode of space metric changing in Global time theory has negative energy density. Swap of energy to this mode from another ones lead to increasing of Universe homogeneity although probability of this swap from local... |
gr-qc/0105021 | Sergio De Filippo | Sergio De Filippo | Nonrelativistic field theoretic setting for gravitational
self-interactions | The statement about the finite character of the ensuing field theory
is more transparent | null | null | null | gr-qc | null | It is shown that a recently proposed model for the gravitational interaction
in non relativistic quantum mechanics is the instantaneous action at a distance
limit of a field theoretic model containing a negative energy field. It reduces
to the Schroedinger-Newton theory in a suitable mean field approximation. While
b... | [
{
"created": "Mon, 7 May 2001 21:21:27 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jul 2001 17:11:32 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"De Filippo",
"Sergio",
""
]
] | It is shown that a recently proposed model for the gravitational interaction in non relativistic quantum mechanics is the instantaneous action at a distance limit of a field theoretic model containing a negative energy field. It reduces to the Schroedinger-Newton theory in a suitable mean field approximation. While bot... |
1010.0962 | Tomohiro Harada | Tomohiro Harada and Masashi Kimura | Collision of an innermost stable circular orbit particle around a Kerr
black hole | 24 pages, 2 figures, accepted for publication in Physical Review D,
minor correction | Phys.Rev.D83:024002,2011 | 10.1103/PhysRevD.83.024002 | RUP-10-3, OCU-PHYS 338, AP-GR 82 | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a general formula for the center-of-mass (CM) energy for the
near-horizon collision of two particles of the same rest mass on the equatorial
plane around a Kerr black hole. We then apply this formula to a particle which
plunges from the innermost stable circular orbit (ISCO) and collides with
another partic... | [
{
"created": "Tue, 5 Oct 2010 18:12:11 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 2010 03:00:59 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Jan 2011 04:47:39 GMT",
"version": "v3"
}
] | 2011-10-21 | [
[
"Harada",
"Tomohiro",
""
],
[
"Kimura",
"Masashi",
""
]
] | We derive a general formula for the center-of-mass (CM) energy for the near-horizon collision of two particles of the same rest mass on the equatorial plane around a Kerr black hole. We then apply this formula to a particle which plunges from the innermost stable circular orbit (ISCO) and collides with another particle... |
gr-qc/0011086 | Spiros Cotsakis | Spiros Cotsakis and John Miritzis | Scalar-tensor $\sigma$-cosmologies | Research announcement, 2 pages, submitted for publication in the MG9
Proceedings | null | null | null | gr-qc | null | We show that the scalar-tensor $\sigma$-model action is conformally
equivalent to general relativity with a minimally coupled wavemap with a
particular target metric. Inflation on the source manifold is then shown to
occur in a natural way due both to the arbitrary curvature couplings and the
wavemap self-interaction... | [
{
"created": "Fri, 24 Nov 2000 10:45:09 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jan 2001 11:19:23 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Cotsakis",
"Spiros",
""
],
[
"Miritzis",
"John",
""
]
] | We show that the scalar-tensor $\sigma$-model action is conformally equivalent to general relativity with a minimally coupled wavemap with a particular target metric. Inflation on the source manifold is then shown to occur in a natural way due both to the arbitrary curvature couplings and the wavemap self-interactions. |
2004.08111 | Maurizio Gasperini | P. Conzinu, M. Gasperini and G. Marozzi | Primordial Black Holes from Pre-Big Bang inflation | 26 pages, two figures. Many new references and a few comments added.
Version accepted for publication in JCAP | null | 10.1088/1475-7516/2020/08/031 | BA-TH/800-20 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the possibility of producing a significant fraction of dark matter
in the form of primordial black holes in the context of the pre-big bang
inflationary scenario. We take into account, to this purpose, the enhancement
of curvature perturbations possibly induced by a variation of the sound-speed
parameter $... | [
{
"created": "Fri, 17 Apr 2020 08:34:34 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jul 2020 12:28:22 GMT",
"version": "v2"
}
] | 2020-08-19 | [
[
"Conzinu",
"P.",
""
],
[
"Gasperini",
"M.",
""
],
[
"Marozzi",
"G.",
""
]
] | We discuss the possibility of producing a significant fraction of dark matter in the form of primordial black holes in the context of the pre-big bang inflationary scenario. We take into account, to this purpose, the enhancement of curvature perturbations possibly induced by a variation of the sound-speed parameter $c_... |
gr-qc/0611047 | Serguei Krasnikov | S. Krasnikov | Unconventional string-like singularities in flat spacetime | Draft. References and comments are welcome. v2. Section 3 is intact,
the rest is made briefer and clearer. A couple of references are added. v3.
Insignificant correstions. The published version | Phys.Rev.D76:024010,2007 | 10.1103/PhysRevD.76.024010 | null | gr-qc | null | The conical singularity in flat spacetime is mostly known as a model of the
cosmic string or the wedge disclination in solids. Its another, equally
important, function is to be a representative of quasiregular singularities.
From all these of views it seems interesting to find out whether there exist
other similar ... | [
{
"created": "Tue, 7 Nov 2006 15:06:38 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Apr 2007 23:29:41 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Apr 2008 17:18:28 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Krasnikov",
"S.",
""
]
] | The conical singularity in flat spacetime is mostly known as a model of the cosmic string or the wedge disclination in solids. Its another, equally important, function is to be a representative of quasiregular singularities. From all these of views it seems interesting to find out whether there exist other similar sing... |
1709.01162 | Mauricio Bellini | Luis Santiago Ridao, Marcos Ramiro Alfredo Arcod\'ia, Mauricio Bellini | Gravitons emission during pre-inflation from unified spinor fields | Version accepted in Eur. Phys. J. Plus. arXiv admin note: substantial
text overlap with arXiv:1703.01355 | null | null | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain the equation that describe the conditions of quantization for
neutral massless bosons on an arbitrary curved space-time, obtained using a
particular theoretical formalism developed in a previous work\cite{MM}. In
particular, we study the emission of neutral massless $(1, 2)\hbar$-spin bosons
during pre-infl... | [
{
"created": "Thu, 31 Aug 2017 19:38:51 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Oct 2017 17:46:55 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Feb 2018 15:54:22 GMT",
"version": "v3"
},
{
"created": "Fri, 2 Nov 2018 16:20:21 GMT",
"version": "v4"
}
] | 2019-09-19 | [
[
"Ridao",
"Luis Santiago",
""
],
[
"Arcodía",
"Marcos Ramiro Alfredo",
""
],
[
"Bellini",
"Mauricio",
""
]
] | We obtain the equation that describe the conditions of quantization for neutral massless bosons on an arbitrary curved space-time, obtained using a particular theoretical formalism developed in a previous work\cite{MM}. In particular, we study the emission of neutral massless $(1, 2)\hbar$-spin bosons during pre-inflat... |
gr-qc/9406044 | Jeff Greensite | A. Carlini and J. Greensite | Fundamental Constants and the Problem of Time | 46 pages + 5 figures, LaTex, NBI-HE-94-31 | Phys.Rev. D52 (1995) 936-960 | 10.1103/PhysRevD.52.936 | null | gr-qc hep-th | null | We point out that for a large class of parametrized theories, there is a
constant in the constrained Hamiltonian which drops out of the classical
equations of motion in configuration space. Examples include the mass of a
relativistic particle in free fall, the tension of the Nambu string, and
Newton's constant for th... | [
{
"created": "Fri, 24 Jun 1994 13:58:39 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Carlini",
"A.",
""
],
[
"Greensite",
"J.",
""
]
] | We point out that for a large class of parametrized theories, there is a constant in the constrained Hamiltonian which drops out of the classical equations of motion in configuration space. Examples include the mass of a relativistic particle in free fall, the tension of the Nambu string, and Newton's constant for the ... |
1209.6261 | Alexander V. Balakin | A.B. Balakin and L.V. Grunskaya | Axion electrodynamics and dark matter fingerprints in the terrestrial
magnetic and electric fields | 26 pages, accepted for publication in the journal Reports on
Mathematical Physics | Reports on Math.Phys. 71 (2013) 45-67 | 10.1016/S0034-4877(13)60021-X | null | gr-qc astro-ph.EP math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider mathematical aspects of the axion electrodynamics in application
to the problem of evolution of geomagnetic and terrestrial electric fields,
which are coupled by relic axions born in the early Universe and
(hypothetically) forming now the cold dark matter. We find axionic analogs of
the Debye potentials, ... | [
{
"created": "Thu, 27 Sep 2012 15:51:09 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Balakin",
"A. B.",
""
],
[
"Grunskaya",
"L. V.",
""
]
] | We consider mathematical aspects of the axion electrodynamics in application to the problem of evolution of geomagnetic and terrestrial electric fields, which are coupled by relic axions born in the early Universe and (hypothetically) forming now the cold dark matter. We find axionic analogs of the Debye potentials, we... |
gr-qc/0111095 | Bernard F. Schutz | Bernard F. Schutz | Lighthouses of Gravitational Wave Astronomy | 19 pages, for conference proceedings Lighthouses of the Universe,
Garching, August 2001 | null | 10.1007/10856495_29 | AEI-2001-139 | gr-qc | null | Gravitational wave detectors capable of making astronomical observations
could begin to operate within the next year, and over the next 10 years they
will extend their reach out to cosmological distances, culminating in the space
mission LISA. A prime target of these observatories will be binary systems,
especially t... | [
{
"created": "Wed, 28 Nov 2001 08:05:31 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Schutz",
"Bernard F.",
""
]
] | Gravitational wave detectors capable of making astronomical observations could begin to operate within the next year, and over the next 10 years they will extend their reach out to cosmological distances, culminating in the space mission LISA. A prime target of these observatories will be binary systems, especially tho... |
1711.11320 | Dennis R\"atzel | Dennis R\"atzel, Fabienne Schneiter, Daniel Braun, Tupac Bravo,
Richard Howl, Maximilian P.E. Lock, Ivette Fuentes | Frequency spectrum of an optical resonator in a curved spacetime | 17 pages, 8 figures, 5 pages appendices | null | 10.1088/1367-2630/aac0ac | null | gr-qc physics.ins-det physics.optics physics.space-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effect of gravity and proper acceleration on the frequency spectrum of an
optical resonator - both rigid or deformable - is considered in the framework
of general relativity. The optical resonator is modeled either as a rod of
matter connecting two mirrors or as a dielectric rod whose ends function as
mirrors. Ex... | [
{
"created": "Thu, 30 Nov 2017 11:18:14 GMT",
"version": "v1"
}
] | 2018-06-13 | [
[
"Rätzel",
"Dennis",
""
],
[
"Schneiter",
"Fabienne",
""
],
[
"Braun",
"Daniel",
""
],
[
"Bravo",
"Tupac",
""
],
[
"Howl",
"Richard",
""
],
[
"Lock",
"Maximilian P. E.",
""
],
[
"Fuentes",
"Ivette",
""
]
] | The effect of gravity and proper acceleration on the frequency spectrum of an optical resonator - both rigid or deformable - is considered in the framework of general relativity. The optical resonator is modeled either as a rod of matter connecting two mirrors or as a dielectric rod whose ends function as mirrors. Expl... |
gr-qc/9802058 | Bozhidar Zakhariev Iliev | Bozhidar Z. Iliev (Institute for Nuclear Research and Nuclear Energy,
Bulgarian Academy of Sciences, Sofia, Bulgaria) | On metric-connection compatibility and the signature change of
space-time | 18 standard LaTeX 2e pages. The packages AMS-LaTeX and amsfonts are
required | Physica Scripta, vol.66, No.6, pp.401-409, 2002 | 10.1238/Physica.Regular.066a00401 | null | gr-qc math-ph math.DG math.MP | null | We discuss and investigate the problem of existence of metric-compatible
linear connections for a given space-time metric which is, generally, assumed
to be semi-pseudo-Riemannian. We prove that under sufficiently general
conditions such connections exist iff the rank and signature of the metric are
constant. On this... | [
{
"created": "Sun, 22 Feb 1998 13:15:57 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Iliev",
"Bozhidar Z.",
"",
"Institute for Nuclear Research and Nuclear Energy,\n Bulgarian Academy of Sciences, Sofia, Bulgaria"
]
] | We discuss and investigate the problem of existence of metric-compatible linear connections for a given space-time metric which is, generally, assumed to be semi-pseudo-Riemannian. We prove that under sufficiently general conditions such connections exist iff the rank and signature of the metric are constant. On this b... |
gr-qc/0111076 | Guest User | G. S. Khadekar and Shilpa Samdurkar (Department of Mathematics, Nagpur
University, Nagpur, India) | Higher Dimensional Cosmological Model in Space-Time-Mass (STM) Theory of
Gravitation | latex 4 pages, no figure | null | null | null | gr-qc | null | A new class of non-static higher dimensional vacuum solutions in space-time
-mass (STM) theory of gravity is found. This solution represent expanding
universe without big bang singularity and the higher dimension of these models
shrinks as they expands.
| [
{
"created": "Thu, 22 Nov 2001 14:08:44 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Nov 2001 10:11:23 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Khadekar",
"G. S.",
"",
"Department of Mathematics, Nagpur\n University, Nagpur, India"
],
[
"Samdurkar",
"Shilpa",
"",
"Department of Mathematics, Nagpur\n University, Nagpur, India"
]
] | A new class of non-static higher dimensional vacuum solutions in space-time -mass (STM) theory of gravity is found. This solution represent expanding universe without big bang singularity and the higher dimension of these models shrinks as they expands. |
gr-qc/0209074 | Nematollah Riazi | Nematollah Riazi and Hassan Niad | Gravitating Isovector Solitons | 10 pages, 4 figures | null | null | null | gr-qc | null | We formulate the nonlinear isovector model in a curved background, and
calculate the spherically symmetric solutions for weak and strong coupling
regimes. The usual belief that gravity does not have appreciable effects on the
structure of solitons will be examined, in the framework of the calculated
solutions, by com... | [
{
"created": "Sat, 21 Sep 2002 01:29:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Riazi",
"Nematollah",
""
],
[
"Niad",
"Hassan",
""
]
] | We formulate the nonlinear isovector model in a curved background, and calculate the spherically symmetric solutions for weak and strong coupling regimes. The usual belief that gravity does not have appreciable effects on the structure of solitons will be examined, in the framework of the calculated solutions, by compa... |
1608.04925 | Hedvika Kadlecova | Hedvika Kadlecov\'a and Ond\v{r}ej Klimo and Stefan Weber and Georg
Korn | Gravitational wave generation by interaction of high power lasers with
matter. Part II: Ablation and Piston models | 22 pages, 32 images. arXiv admin note: substantial text overlap with
arXiv:1602.08904 | null | null | null | gr-qc hep-th physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze theoretical models of gravitational waves generation in the
interaction of high intensity laser with matter, namely ablation and piston
models. We analyse the generated gravitational waves in linear approximation of
gravitational theory. We derive the analytical formulas and estimates for the
metric pertur... | [
{
"created": "Wed, 17 Aug 2016 11:15:15 GMT",
"version": "v1"
}
] | 2016-08-18 | [
[
"Kadlecová",
"Hedvika",
""
],
[
"Klimo",
"Ondřej",
""
],
[
"Weber",
"Stefan",
""
],
[
"Korn",
"Georg",
""
]
] | We analyze theoretical models of gravitational waves generation in the interaction of high intensity laser with matter, namely ablation and piston models. We analyse the generated gravitational waves in linear approximation of gravitational theory. We derive the analytical formulas and estimates for the metric perturba... |
gr-qc/9410047 | null | L.H. Ford | Gravitons and Lightcone Fluctuations | 18pp, LATEX, TUTP-94-15 | Phys.Rev.D51:1692-1700,1995 | 10.1103/PhysRevD.51.1692 | null | gr-qc hep-th | null | Gravitons in a squeezed vacuum state, the natural result of quantum creation
in the early universe or by black holes, will introduce metric fluctuations.
These metric fluctuations will introduce fluctuations of the lightcone. It is
shown that when the various two-point functions of a quantized field are
averaged over... | [
{
"created": "Mon, 31 Oct 1994 21:49:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ford",
"L. H.",
""
]
] | Gravitons in a squeezed vacuum state, the natural result of quantum creation in the early universe or by black holes, will introduce metric fluctuations. These metric fluctuations will introduce fluctuations of the lightcone. It is shown that when the various two-point functions of a quantized field are averaged over t... |
2111.00712 | Supakchai Ponglertsakul | Piyabut Burikham, Sitthichai Pinkanjanarod and Supakchai Ponglertsakul | Slowly Rotating Neutron Star with Holographic Multiquark Core: I-Love-Q
Relations | 9 pages, 7 figures | null | 10.1103/PhysRevD.105.104018 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Moment of inertia ($I$), rotational~(tidal) Love number ($\lambda^{\rm
(rot)}$) and quadrupole moment ($Q$) of slowly rotating massive neutron
star~(NS) with holographic multiquark~(MQ) core are computed in comparison to
pure MQ star. The Chiral Effective Theory~(CET) stiff equation of state~(EoS)
is used in the crus... | [
{
"created": "Mon, 1 Nov 2021 05:40:02 GMT",
"version": "v1"
}
] | 2022-05-25 | [
[
"Burikham",
"Piyabut",
""
],
[
"Pinkanjanarod",
"Sitthichai",
""
],
[
"Ponglertsakul",
"Supakchai",
""
]
] | Moment of inertia ($I$), rotational~(tidal) Love number ($\lambda^{\rm (rot)}$) and quadrupole moment ($Q$) of slowly rotating massive neutron star~(NS) with holographic multiquark~(MQ) core are computed in comparison to pure MQ star. The Chiral Effective Theory~(CET) stiff equation of state~(EoS) is used in the crust ... |
gr-qc/0104071 | Elena Cuoco | Elena Cuoco, Giovanni Losurdo, Giovanni Calamai, Leonardo Fabbroni,
Massimo Mazzoni, Ruggero Stanga, Gianluca Guidi, Flavio Vetrano | Noise parametric identification and whitening for LIGO 40-meter
interferometer data | 11 pages, 15 figures, accepted for publication by Physical Review D | Phys.Rev.D64:122002,2001 | 10.1103/PhysRevD.64.122002 | null | gr-qc | null | We report the analysis we made on data taken by Caltech 40-meter prototype
interferometer to identify the noise power spectral density and to whiten the
sequence of noise. We concentrate our study on data taken in November 1994, in
particular we analyzed two frames of data: the 18nov94.2.frame and the
19nov94.2.frame... | [
{
"created": "Mon, 23 Apr 2001 13:27:08 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Aug 2001 08:15:29 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Cuoco",
"Elena",
""
],
[
"Losurdo",
"Giovanni",
""
],
[
"Calamai",
"Giovanni",
""
],
[
"Fabbroni",
"Leonardo",
""
],
[
"Mazzoni",
"Massimo",
""
],
[
"Stanga",
"Ruggero",
""
],
[
"Guidi",
"Gianluca",
""
]... | We report the analysis we made on data taken by Caltech 40-meter prototype interferometer to identify the noise power spectral density and to whiten the sequence of noise. We concentrate our study on data taken in November 1994, in particular we analyzed two frames of data: the 18nov94.2.frame and the 19nov94.2.frame. ... |
1601.06337 | Ambrish Raghoonundun | Ambrish M. Raghoonundun and David W. Hobill | The Geometrical Structure of the Tolman VII solution | To be submitted to classical and quantum gravity | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Tolman~VII solution, an exact analytic solution to the spherically
symmetric, static Einstein equations with a perfect fluid source, has many
characteristics that make it interesting for modelling high density physical
astronomical objects. Here we supplement those characteristics with the
geometrical tensors tha... | [
{
"created": "Sun, 24 Jan 2016 02:38:08 GMT",
"version": "v1"
}
] | 2016-01-26 | [
[
"Raghoonundun",
"Ambrish M.",
""
],
[
"Hobill",
"David W.",
""
]
] | The Tolman~VII solution, an exact analytic solution to the spherically symmetric, static Einstein equations with a perfect fluid source, has many characteristics that make it interesting for modelling high density physical astronomical objects. Here we supplement those characteristics with the geometrical tensors that ... |
1910.09415 | Ben Kain | Emanuel Daka, Nhon N. Phan, and Ben Kain | Perturbing the ground state of Dirac stars | 17 pages, 8 figures | null | 10.1103/PhysRevD.100.084042 | Phys. Rev. D 100, 084042 (2019) | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dirac stars are self-gravitating configurations of spin-1/2 fermions in which
the fermions are described by the Dirac equation. After a detailed review of
the derivation of the equations and their static solutions, we present an
in-depth dynamical stability analysis of the ground state similar to previous
studies for... | [
{
"created": "Mon, 21 Oct 2019 14:45:22 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Daka",
"Emanuel",
""
],
[
"Phan",
"Nhon N.",
""
],
[
"Kain",
"Ben",
""
]
] | Dirac stars are self-gravitating configurations of spin-1/2 fermions in which the fermions are described by the Dirac equation. After a detailed review of the derivation of the equations and their static solutions, we present an in-depth dynamical stability analysis of the ground state similar to previous studies for b... |
gr-qc/0203040 | Horst R. Beyer | Horst R. Beyer | Results on the spectrum of R-Modes of slowly rotating relativistic stars | null | Class.Quant.Grav. 23 (2006) 2409-2426 | null | null | gr-qc astro-ph math-ph math.MP | null | The paper considers the spectrum of axial perturbations of slowly uniformly
rotating general relativistic stars in the framework of Y. Kojima. In a first
step towards a full analysis only the evolution equations are treated but not
the constraint. Then it is found that the system is unstable due to a continuum
of non... | [
{
"created": "Tue, 12 Mar 2002 16:49:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Beyer",
"Horst R.",
""
]
] | The paper considers the spectrum of axial perturbations of slowly uniformly rotating general relativistic stars in the framework of Y. Kojima. In a first step towards a full analysis only the evolution equations are treated but not the constraint. Then it is found that the system is unstable due to a continuum of non r... |
2405.07484 | Aaqid Bhat | Aaqid Bhat, Raja Solanki, P.K. Sahoo | Extended Bose-Einstein condensate dark matter in $f(Q)$ gravity | GRG published version | General Relativity and Gravitation, 56 (2024) 63 | 10.1007/s10714-024-03247-3 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this article, we attempt to explore the dark sector of the universe i.e.
dark matter and dark energy, where the dark energy components are related to
the modified $f(Q)$ Lagrangian, particularly a power law function $f(Q)= \gamma
\left(\frac{Q}{Q_0}\right)^n$, while the dark matter component is described by
the Ex... | [
{
"created": "Mon, 13 May 2024 05:58:01 GMT",
"version": "v1"
}
] | 2024-05-24 | [
[
"Bhat",
"Aaqid",
""
],
[
"Solanki",
"Raja",
""
],
[
"Sahoo",
"P. K.",
""
]
] | In this article, we attempt to explore the dark sector of the universe i.e. dark matter and dark energy, where the dark energy components are related to the modified $f(Q)$ Lagrangian, particularly a power law function $f(Q)= \gamma \left(\frac{Q}{Q_0}\right)^n$, while the dark matter component is described by the Exte... |
1708.07383 | Behnam Pourhassan | J. Sadeghi, B. Pourhassan, and F. Rahimi | Logarithmic corrections of charged hairy black hole in (2+1) dimension | 10 pages | Can. J. Phys. 92 (2014) 1638 | 10.1139/cjp-2014-0229 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a charged black hole with a scalar field that is coupled to
gravity in (2 + 1)-dimensions. We compute the logarithmic corrections to the
corresponding system using two approaches. In the first method we take
advantage of thermodynamic properties. In the second method we use the metric
function that is sug... | [
{
"created": "Wed, 23 Aug 2017 12:24:28 GMT",
"version": "v1"
}
] | 2017-08-25 | [
[
"Sadeghi",
"J.",
""
],
[
"Pourhassan",
"B.",
""
],
[
"Rahimi",
"F.",
""
]
] | We consider a charged black hole with a scalar field that is coupled to gravity in (2 + 1)-dimensions. We compute the logarithmic corrections to the corresponding system using two approaches. In the first method we take advantage of thermodynamic properties. In the second method we use the metric function that is sugge... |
2308.01498 | P. A. Gonzalez | P. A. Gonz\'alez, Marco Olivares, Yerko V\'asquez, J. R. Villanueva | Timelike geodesics for five-dimensional Schwarzschild and
Reissner-Nordstr\"om Anti-de Sitter black holes | 15 pages, and 15 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The timelike structure of the five-dimensional Schwarzschild and
Reissner-Nordstr\"om Anti-de Sitter black holes is studied in detail. Different
kinds of motion are allowed and studied by using an adequate effective
potential. Then, by solving the corresponding equations of motion, several
trajectories and orbits are... | [
{
"created": "Thu, 3 Aug 2023 01:50:12 GMT",
"version": "v1"
}
] | 2023-08-04 | [
[
"González",
"P. A.",
""
],
[
"Olivares",
"Marco",
""
],
[
"Vásquez",
"Yerko",
""
],
[
"Villanueva",
"J. R.",
""
]
] | The timelike structure of the five-dimensional Schwarzschild and Reissner-Nordstr\"om Anti-de Sitter black holes is studied in detail. Different kinds of motion are allowed and studied by using an adequate effective potential. Then, by solving the corresponding equations of motion, several trajectories and orbits are d... |
2301.12164 | Cosimo Bambi | Jiahao Tao, Shafqat Riaz, Biao Zhou, Askar B. Abdikamalov, Cosimo
Bambi, Daniele Malafarina | Testing the $\delta$-Kerr metric with black hole X-ray data | 17 pages, 7 figures. v2: refereed version | Phys. Rev. D 108, 083036 (2023) | 10.1103/PhysRevD.108.083036 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spacetime around astrophysical black holes is thought to be described by
the Kerr solution. However, even within general relativity, there is not yet a
proof that the final product of the complete collapse of an uncharged body can
only be a Kerr black hole. We can thus speculate on the possibility that the
spacet... | [
{
"created": "Sat, 28 Jan 2023 11:31:47 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Oct 2023 14:19:24 GMT",
"version": "v2"
}
] | 2023-10-26 | [
[
"Tao",
"Jiahao",
""
],
[
"Riaz",
"Shafqat",
""
],
[
"Zhou",
"Biao",
""
],
[
"Abdikamalov",
"Askar B.",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Malafarina",
"Daniele",
""
]
] | The spacetime around astrophysical black holes is thought to be described by the Kerr solution. However, even within general relativity, there is not yet a proof that the final product of the complete collapse of an uncharged body can only be a Kerr black hole. We can thus speculate on the possibility that the spacetim... |
1310.1067 | Muhammad Zubair | M. Sharif, M. Zubair | Cosmology of Holographic and New Agegraphic $f(R,T)$ Models | 27 pages, 12 figures | J. Phys. Soc. Jpn. 82(2013)064001 | 10.7566/JPSJ.82.064001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the $f(R,T)$ theory, where $R$ is the scalar curvature and $T$ is
the trace of energy-momentum tensor, as an effective description for the
holographic and new agegraphic dark energy and reconstruct the corresponding
$f(R,T)$ functions. In this study, we concentrate on two particular models of
$f(R,T)$ gra... | [
{
"created": "Thu, 29 Aug 2013 11:28:45 GMT",
"version": "v1"
}
] | 2013-10-04 | [
[
"Sharif",
"M.",
""
],
[
"Zubair",
"M.",
""
]
] | We consider the $f(R,T)$ theory, where $R$ is the scalar curvature and $T$ is the trace of energy-momentum tensor, as an effective description for the holographic and new agegraphic dark energy and reconstruct the corresponding $f(R,T)$ functions. In this study, we concentrate on two particular models of $f(R,T)$ gravi... |
gr-qc/9806029 | Hector F. Hernandez G. | H. Hernandez, L. A. Nunez and U. Percoco | Nonlocal Equation of State in General Relativistic Radiating Spheres | 19 pages, Revtex, 1 Postscript Figure | Class.Quant.Grav.16:871-896,1999 | 10.1088/0264-9381/16/3/017 | null | gr-qc | null | We show that under particular circumstances a general relativistic
spherically symmetric bounded distribution of matter could satisfy a nonlocal
equation of state. This equation relates, at a given point, the components of
the corresponding energy momentum tensor not only as function at that point,
but as a functiona... | [
{
"created": "Fri, 5 Jun 1998 16:35:58 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Hernandez",
"H.",
""
],
[
"Nunez",
"L. A.",
""
],
[
"Percoco",
"U.",
""
]
] | We show that under particular circumstances a general relativistic spherically symmetric bounded distribution of matter could satisfy a nonlocal equation of state. This equation relates, at a given point, the components of the corresponding energy momentum tensor not only as function at that point, but as a functional ... |
2402.02497 | Jo\~ao Cavedagne Lobato | Jo\~ao C. Lobato and Maur\'icio O. Calv\~ao | Gravitational wave energy momentum-tensor in reduced Horndeski theories | null | null | 10.1103/PhysRevD.109.044004 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We generalize, imposing the field equations only at dominant order, the
Isaacson formula for the gravitational wave (GW) energy-momentum tensor (EMT)
to the class of Horndeski theories in which the tensor modes travel at the
speed of light (reduced Horndeski theories) and scalar waves are present. We
discuss importan... | [
{
"created": "Sun, 4 Feb 2024 14:11:53 GMT",
"version": "v1"
}
] | 2024-02-06 | [
[
"Lobato",
"João C.",
""
],
[
"Calvão",
"Maurício O.",
""
]
] | We generalize, imposing the field equations only at dominant order, the Isaacson formula for the gravitational wave (GW) energy-momentum tensor (EMT) to the class of Horndeski theories in which the tensor modes travel at the speed of light (reduced Horndeski theories) and scalar waves are present. We discuss important ... |
1605.04811 | Laszlo B. Szabados | L\'aszl\'o B Szabados | The evanescence of rest masses and electric charge in black holes | the results are included in arXiv:1603.06997v3 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classical Einstein-Standard Model system with conformally invariant
coupling of the Higgs field to gravity is investigated in nearly Schwarzschild
black holes. We show that, in the presence of Kantowski-Sachs symmetries, there
is a finite critical value of the mean curvature such that on spacelike
hypersurfaces w... | [
{
"created": "Mon, 16 May 2016 15:45:55 GMT",
"version": "v1"
},
{
"created": "Mon, 29 May 2017 23:57:53 GMT",
"version": "v2"
}
] | 2017-05-31 | [
[
"Szabados",
"László B",
""
]
] | The classical Einstein-Standard Model system with conformally invariant coupling of the Higgs field to gravity is investigated in nearly Schwarzschild black holes. We show that, in the presence of Kantowski-Sachs symmetries, there is a finite critical value of the mean curvature such that on spacelike hypersurfaces wit... |
0812.1059 | Friedrich W. Hehl | Friedrich W. Hehl (U of Cologne and U of Missouri-Columbia) and Bahram
Mashhoon (U of Missouri-Columbia) | Nonlocal Gravity Simulates Dark Matter | 5 pages RevTex, v3: new material and references added, abstract
somewhat extended | Phys.Lett.B673:279-282,2009 | 10.1016/j.physletb.2009.02.033 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A nonlocal generalization of Einstein's theory of gravitation is constructed
within the framework of the translational gauge theory of gravity. In the
linear approximation, the nonlocal theory can be interpreted as linearized
general relativity but in the presence of "dark matter" that can be simply
expressed as an i... | [
{
"created": "Fri, 5 Dec 2008 00:41:18 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Dec 2008 21:18:05 GMT",
"version": "v2"
},
{
"created": "Tue, 3 Feb 2009 17:09:50 GMT",
"version": "v3"
}
] | 2009-03-24 | [
[
"Hehl",
"Friedrich W.",
"",
"U of Cologne and U of Missouri-Columbia"
],
[
"Mashhoon",
"Bahram",
"",
"U of Missouri-Columbia"
]
] | A nonlocal generalization of Einstein's theory of gravitation is constructed within the framework of the translational gauge theory of gravity. In the linear approximation, the nonlocal theory can be interpreted as linearized general relativity but in the presence of "dark matter" that can be simply expressed as an int... |
1108.1988 | Bob Coecke | Bob Coecke and Raymond Lal | Time-asymmetry of probabilities versus relativistic causal structure: an
arrow of time | 4 pages, some figures; replaces arXiv:1010.4572 [quant-ph] | Phys. Rev. Lett. 108, 200403 (2012) | 10.1103/PhysRevLett.108.200403 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is an incompatibility between the symmetries of causal structure in
relativity theory and the signaling abilities of probabilistic devices with
inputs and outputs: while time-reversal in relativity will not introduce the
ability to signal between spacelike separated regions, this is not the case for
probabilist... | [
{
"created": "Tue, 9 Aug 2011 17:21:23 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2011 13:49:45 GMT",
"version": "v2"
}
] | 2014-05-19 | [
[
"Coecke",
"Bob",
""
],
[
"Lal",
"Raymond",
""
]
] | There is an incompatibility between the symmetries of causal structure in relativity theory and the signaling abilities of probabilistic devices with inputs and outputs: while time-reversal in relativity will not introduce the ability to signal between spacelike separated regions, this is not the case for probabilistic... |
gr-qc/9905048 | Nikolaos Mavromatos | John.Ellis, N.E. Mavromatos and D.V. Nanopoulos | Search for Quantum Gravity | 7 pages LATEX, no figures, Awarded First Prize in the Gravity
Research Foundation Essay Competition for 1999 | Gen.Rel.Grav.31:1257-1262,1999 | 10.1023/A:1026720723556 | null | gr-qc astro-ph hep-ph hep-th | null | A satisfactory theory of quantum gravity may necessitate a drastic
modification of our perception of space-time, by giving it a foamy structure at
distances comparable to the Planck length. It is argued in this essay that the
experimental detection of such structures may be a realistic possibility in the
foreseeable ... | [
{
"created": "Fri, 14 May 1999 15:52:40 GMT",
"version": "v1"
}
] | 2009-09-11 | [
[
"Ellis",
"John.",
""
],
[
"Mavromatos",
"N. E.",
""
],
[
"Nanopoulos",
"D. V.",
""
]
] | A satisfactory theory of quantum gravity may necessitate a drastic modification of our perception of space-time, by giving it a foamy structure at distances comparable to the Planck length. It is argued in this essay that the experimental detection of such structures may be a realistic possibility in the foreseeable fu... |
1510.02560 | Shao-Wen Wei | Shao-Wen Wei, Yu-Xiao Liu, Chun-E Fu | Null geodesics and gravitational lensing in a nonsingular spacetime | 15 pages, 5 figures, 1 table | Adv.High Energy Phys. 2015 (2015) 454217 | 10.1155/2015/454217 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the null geodesics and gravitational lensing in a nonsingular
spacetime are investigated. According to the nature of the null geodesics, the
spacetime is divided into several cases. In the weak deflection limit, we find
the influence of the nonsingularity parameter $q$ on the positions and
magnificatio... | [
{
"created": "Fri, 9 Oct 2015 03:32:02 GMT",
"version": "v1"
}
] | 2015-10-12 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
],
[
"Fu",
"Chun-E",
""
]
] | In this paper, the null geodesics and gravitational lensing in a nonsingular spacetime are investigated. According to the nature of the null geodesics, the spacetime is divided into several cases. In the weak deflection limit, we find the influence of the nonsingularity parameter $q$ on the positions and magnifications... |
gr-qc/0004012 | Luc Blanchet | Luc Blanchet | Post-Newtonian Gravitational Radiation | 46 pages, in Einstein's Field Equations and Their Physical
Implications, B. Schmidt (Ed.), Lecture Notes in Physics, Springer | Lect.Notes Phys.540:225-272,2000 | null | null | gr-qc | null | 1 Introduction 2 Multipole Decomposition 3 Source Multipole Moments 4
Post-Minkowskian Approximation 5 Radiative Multipole Moments 6 Post-Newtonian
Approximation 7 Point-Particles 8 Conclusion
| [
{
"created": "Tue, 4 Apr 2000 16:01:33 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Blanchet",
"Luc",
""
]
] | 1 Introduction 2 Multipole Decomposition 3 Source Multipole Moments 4 Post-Minkowskian Approximation 5 Radiative Multipole Moments 6 Post-Newtonian Approximation 7 Point-Particles 8 Conclusion |
2110.00556 | Nephtal\'i Eliceo Mart\'inez P\'erez | N.E. Mart\'inez-P\'erez, C. Ram\'irez and V. V\'azquez-B\'aez | 1D Supergravity FLRW Model of Starobinsky | 17 pages, 2 figures | Universe 2021, 7(11), 449 | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study two homogeneous supersymmetric extensions for the $f(R)$ modified
gravity model of Starobinsky with the FLRW metric. The actions are defined in
terms of a superfield $\mathcal{R}$ that contains the FLRW scalar curvature.
One model has N=1 local supersymmetry, and its bosonic sector is the
Starobinsky action;... | [
{
"created": "Fri, 1 Oct 2021 17:35:38 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Nov 2021 21:53:16 GMT",
"version": "v2"
}
] | 2021-11-23 | [
[
"Martínez-Pérez",
"N. E.",
""
],
[
"Ramírez",
"C.",
""
],
[
"Vázquez-Báez",
"V.",
""
]
] | We study two homogeneous supersymmetric extensions for the $f(R)$ modified gravity model of Starobinsky with the FLRW metric. The actions are defined in terms of a superfield $\mathcal{R}$ that contains the FLRW scalar curvature. One model has N=1 local supersymmetry, and its bosonic sector is the Starobinsky action; t... |
gr-qc/0501048 | Alfredo Macias | Claus Laemmerzahl, Alfredo Macias, and Holger Mueller | Lorentz invariance violation and charge (non--)conservation: A general
theoretical frame for extensions of the Maxwell equations | To appear in Physical Review D | Phys.Rev.D71:025007,2005 | 10.1103/PhysRevD.71.025007 | null | gr-qc | null | All quantum gravity approaches lead to small modifications in the standard
laws of physics which lead to violations of Lorentz invariance. One particular
example is the extended standard model (SME). Here, a general phenomenological
approach for extensions of the Maxwell equations is presented which turns out
to be m... | [
{
"created": "Fri, 14 Jan 2005 18:20:29 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Laemmerzahl",
"Claus",
""
],
[
"Macias",
"Alfredo",
""
],
[
"Mueller",
"Holger",
""
]
] | All quantum gravity approaches lead to small modifications in the standard laws of physics which lead to violations of Lorentz invariance. One particular example is the extended standard model (SME). Here, a general phenomenological approach for extensions of the Maxwell equations is presented which turns out to be mor... |
1402.2785 | Dmitry Shogin | Dmitry Shogin and Sigbj{\o}rn Hervik | Dynamics of tilted Bianchi models of types III, IV, V in presence of
diffusion | 26 pages, 8 figures | Class. Quant. Grav. 32 (2015) 055008 | 10.1088/0264-9381/32/5/055008 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the three types of class B Bianchi cosmologies filled with a
tilted perfect fluid undergoing velocity diffusion in a scalar field
background. We consider the two most importantcases: dust and radiation. A
complete numerical integration of the Einstein field equations coupled with the
diffusion equation... | [
{
"created": "Wed, 12 Feb 2014 11:03:16 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Dec 2014 09:43:37 GMT",
"version": "v2"
}
] | 2015-02-05 | [
[
"Shogin",
"Dmitry",
""
],
[
"Hervik",
"Sigbjørn",
""
]
] | We investigate the three types of class B Bianchi cosmologies filled with a tilted perfect fluid undergoing velocity diffusion in a scalar field background. We consider the two most importantcases: dust and radiation. A complete numerical integration of the Einstein field equations coupled with the diffusion equations ... |
gr-qc/9907012 | Sungwon | S.-W. Kim and S. P. Kim | The traversable wormhole with classical scalar fields | 10 pages, Revtex. | Phys.Rev. D58 (1998) 087703 | 10.1103/PhysRevD.58.087703 | null | gr-qc | null | We study the Lorentzian static traversable wormholes coupled to quadratic
scalar fields. We also obtain the solutions of the scalar fields and matters in
the wormhole background and find that the minimal size of the wormhole should
be quantized under the appropriate boundary conditions for the positive
non-minimal ma... | [
{
"created": "Mon, 5 Jul 1999 05:03:53 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kim",
"S. -W.",
""
],
[
"Kim",
"S. P.",
""
]
] | We study the Lorentzian static traversable wormholes coupled to quadratic scalar fields. We also obtain the solutions of the scalar fields and matters in the wormhole background and find that the minimal size of the wormhole should be quantized under the appropriate boundary conditions for the positive non-minimal mass... |
2104.06005 | Christiane Klein | Christiane Klein and Jochen Zahn | The renormalized charged scalar current in the Reissner-Nordstr\"om-de
Sitter spacetime | 12 pages, 5 figures, version as accepted for PRD | Phys. Rev. D 104, 025009 (2021) | 10.1103/PhysRevD.104.025009 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We perform a Hadamard point-split renormalization of the current density
$j_\nu$ of a charged scalar field in a Reissner-Nordstr\"om-de Sitter
spacetime. We compute numerically the expectation values of the components
$j_r$ and $j_t$ in the Unruh state in the exterior region and study their
dependence on the field pa... | [
{
"created": "Tue, 13 Apr 2021 08:15:11 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jul 2021 06:55:08 GMT",
"version": "v2"
}
] | 2021-07-19 | [
[
"Klein",
"Christiane",
""
],
[
"Zahn",
"Jochen",
""
]
] | We perform a Hadamard point-split renormalization of the current density $j_\nu$ of a charged scalar field in a Reissner-Nordstr\"om-de Sitter spacetime. We compute numerically the expectation values of the components $j_r$ and $j_t$ in the Unruh state in the exterior region and study their dependence on the field para... |
1302.6983 | Jose Geraldo Pereira | J. G. Pereira | Teleparallelism: A New Insight Into Gravity | Chapter to appear in "Handbook of Spacetime", edited by A. Ashtekar
and V. Petcov (Springer, Berlin, 2013). V2: misprints corrected, references
updated | null | 10.1007/978-3-642-41992-8_11 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Teleparallel gravity, a gauge theory for the translation group, turns up as
fully equivalent to Einstein's general relativity. In spite of this
equivalence, it provides a whole new insight into gravitation. It breaks
several paradigms related to the geometric approach of general relativity, and
introduces new concept... | [
{
"created": "Wed, 27 Feb 2013 20:31:12 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Aug 2014 16:36:19 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Pereira",
"J. G.",
""
]
] | Teleparallel gravity, a gauge theory for the translation group, turns up as fully equivalent to Einstein's general relativity. In spite of this equivalence, it provides a whole new insight into gravitation. It breaks several paradigms related to the geometric approach of general relativity, and introduces new concepts ... |
1506.01271 | Walter Simon | Piotr Bizo\'n, Stefan Pletka and Walter Simon | Initial data for rotating cosmologies | 22p; corrects typos of version 3, and of published version | Class. Quantum Grav. 32 (2015) 175015 | 10.1088/0264-9381/32/17/175015 | UWThPh-2015-15 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the construction of maximal initial data on compact manifolds in
vacuum with positive cosmological constant via the conformal method. We
discuss, extend and apply recent results of Hebey et al. [19] and Premoselli
[31] which yield existence, non-existence, (non-)uniqueness and
(linearisation-) stability of... | [
{
"created": "Wed, 3 Jun 2015 15:04:47 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jun 2015 16:39:06 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Aug 2015 15:08:29 GMT",
"version": "v3"
},
{
"created": "Fri, 18 Mar 2016 10:44:36 GMT",
"version": "v4"
}
] | 2016-03-21 | [
[
"Bizoń",
"Piotr",
""
],
[
"Pletka",
"Stefan",
""
],
[
"Simon",
"Walter",
""
]
] | We revisit the construction of maximal initial data on compact manifolds in vacuum with positive cosmological constant via the conformal method. We discuss, extend and apply recent results of Hebey et al. [19] and Premoselli [31] which yield existence, non-existence, (non-)uniqueness and (linearisation-) stability of s... |
gr-qc/9910112 | null | M. A. Clayton and J. W. Moffat | Scalar-Tensor Gravity Theory For Dynamical Light Velocity | 14 pages latex file. Additional material added. Accepted for
publication in Physics Letters B | Phys.Lett. B477 (2000) 269-275 | 10.1016/S0370-2693(00)00192-1 | UTPT-99 | gr-qc astro-ph hep-ph | null | A gravity theory is developed with the metric ${\hat g}_{\mu\nu}=
{g}_{\mu\nu}+B\partial_\mu\phi\partial_\nu\phi$. In the present universe the
additional contribution from the scalar field in the metric ${\hat g}_{\mu\nu}$
can generate an acceleration in the expansion of the universe, without negative
pressure and wi... | [
{
"created": "Sun, 31 Oct 1999 22:09:24 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 2000 22:41:13 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Clayton",
"M. A.",
""
],
[
"Moffat",
"J. W.",
""
]
] | A gravity theory is developed with the metric ${\hat g}_{\mu\nu}= {g}_{\mu\nu}+B\partial_\mu\phi\partial_\nu\phi$. In the present universe the additional contribution from the scalar field in the metric ${\hat g}_{\mu\nu}$ can generate an acceleration in the expansion of the universe, without negative pressure and with... |
1710.03438 | Andrzej Rostworowski | Piotr Bizo\'n, Andrzej Rostworowski | Gravitational turbulent instability of AdS${}_5$ | talk given at Strings2014, Princeton, June 2014 | Acta Phys.Polon. B48 (2017) 1375 | 10.5506/APhysPolB.48.1375 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the problem of stability of anti-de Sitter spacetime in five
dimensions under small purely gravitational perturbations satisfying the
cohomogeneity-two biaxial Bianchi IX ansatz. In analogy to spherically
symmetric scalar perturbations, we observe numerically a black hole formation
on the time-scale $\mat... | [
{
"created": "Tue, 10 Oct 2017 08:08:36 GMT",
"version": "v1"
}
] | 2017-10-11 | [
[
"Bizoń",
"Piotr",
""
],
[
"Rostworowski",
"Andrzej",
""
]
] | We consider the problem of stability of anti-de Sitter spacetime in five dimensions under small purely gravitational perturbations satisfying the cohomogeneity-two biaxial Bianchi IX ansatz. In analogy to spherically symmetric scalar perturbations, we observe numerically a black hole formation on the time-scale $\mathc... |
1408.5324 | Chen Songbai | Songbai Chen, Jiliang Jing | Dynamical evolution of a vector field perturbation coupling to Einstein
tensor | 19 pages; 10 figures. Title is changed and the mistakes are
corrected. Accepted by PRD for publication. arXiv admin note: text overlap
with arXiv:1307.7459 | Phys.Rev. D 90, 124059 (2014) | 10.1103/PhysRevD.90.124059 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have investigated the wave dynamics of a vector field perturbation
coupling to Einstein tensor in the four-dimensional Reissner-Nordstr\"{o}m
black hole spacetime. Our results show that besides the dependence on the
coupling between the vector field and Einstein tensor, the wave dynamic
equation of the vector fiel... | [
{
"created": "Fri, 22 Aug 2014 15:25:21 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Dec 2014 02:49:37 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | We have investigated the wave dynamics of a vector field perturbation coupling to Einstein tensor in the four-dimensional Reissner-Nordstr\"{o}m black hole spacetime. Our results show that besides the dependence on the coupling between the vector field and Einstein tensor, the wave dynamic equation of the vector field ... |
0806.3289 | Galin Gyulchev | Galin N. Gyulchev, Stoytcho S. Yazadjiev | Gravitational Lensing by Rotating Naked Singularities | 35 pages, 30 figures | Phys.Rev.D78:083004,2008 | 10.1103/PhysRevD.78.083004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We model massive compact objects in galactic nuclei as stationary,
axially-symmetric naked singularities in the Einstein-massless scalar field
theory and study the resulting gravitational lensing. In the weak deflection
limit we study analytically the position of the two weak field images, the
corresponding signed an... | [
{
"created": "Thu, 19 Jun 2008 18:10:42 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Gyulchev",
"Galin N.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | We model massive compact objects in galactic nuclei as stationary, axially-symmetric naked singularities in the Einstein-massless scalar field theory and study the resulting gravitational lensing. In the weak deflection limit we study analytically the position of the two weak field images, the corresponding signed and ... |
1704.05790 | Maxime Van de Moortel | Maxime Van de Moortel | Stability and instability of the sub-extremal Reissner-Nordstr\"om black
hole interior for the Einstein-Maxwell-Klein-Gordon equations in spherical
symmetry | 46 pages, 4 figures Correction of a few typos. Version accepted for
publication in Communications in Mathematical Physics | null | 10.1007/s00220-017-3079-3 | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show non-linear stability and instability results in spherical symmetry
for the interior of a charged black hole -approaching a sub-extremal
Reissner-Nordstr\"om background fast enough at infinity- in presence of a
massive and charged scalar field, motivated by the strong cosmic censorship
conjecture in that setti... | [
{
"created": "Wed, 19 Apr 2017 15:59:40 GMT",
"version": "v1"
},
{
"created": "Thu, 4 May 2017 03:31:00 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Nov 2017 19:36:57 GMT",
"version": "v3"
}
] | 2018-03-14 | [
[
"Van de Moortel",
"Maxime",
""
]
] | We show non-linear stability and instability results in spherical symmetry for the interior of a charged black hole -approaching a sub-extremal Reissner-Nordstr\"om background fast enough at infinity- in presence of a massive and charged scalar field, motivated by the strong cosmic censorship conjecture in that setting... |
gr-qc/0608065 | Jose M. M. Senovilla | Jos\'e M.M. Senovilla | The universal 'energy' operator | 13 pages, no figures; minor improvements and corrections. This is a
larger, expanded version, containing proofs and explanations not available in
the short Note to be published in CQG | Class.Quant.Grav. 23 (2006) 7143-7148 | 10.1088/0264-9381/23/23/N01 | null | gr-qc | null | The "positive square" of any tensor is presented in a universal and unified
manner, valid in Lorentzian manifolds of arbitrary dimension, and independently
of any (anti)-symmetry properties of the tensor. For rank-m tensors, the
positive square has rank 2m. Positive here means future, that is to say,
satisfying the d... | [
{
"created": "Sat, 12 Aug 2006 16:08:25 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Oct 2006 09:03:17 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Senovilla",
"José M. M.",
""
]
] | The "positive square" of any tensor is presented in a universal and unified manner, valid in Lorentzian manifolds of arbitrary dimension, and independently of any (anti)-symmetry properties of the tensor. For rank-m tensors, the positive square has rank 2m. Positive here means future, that is to say, satisfying the dom... |
2103.17108 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | On wormholes in spacetimes of embedding class one | 8 pages, no figures | Fund. J. Math. Phys., vol. 9, pages 21-33, 2021 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An $n$-dimensional Riemannian space is said to be of embedding class $m$ if
$n+m$ is the lowest dimension of the flat space in which the given space can be
embedded. A spherically symmetric spacetime of class two can be reduced to
class one by a suitable transformation of coordinates. Applied to wormholes,
given a we... | [
{
"created": "Wed, 31 Mar 2021 14:24:43 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Apr 2021 15:03:58 GMT",
"version": "v2"
}
] | 2021-04-13 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | An $n$-dimensional Riemannian space is said to be of embedding class $m$ if $n+m$ is the lowest dimension of the flat space in which the given space can be embedded. A spherically symmetric spacetime of class two can be reduced to class one by a suitable transformation of coordinates. Applied to wormholes, given a well... |
2106.05097 | Le\"ila Haegel | Le\"ila Haegel | Searching for new physics during gravitational waves propagation | Contribution to the 2021 Gravitation session of the 55th Rencontres
de Moriond | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The direct detection of gravitational waves by ground-based interferometers
opened an unprecedented channel to probe alternative theories of gravitation.
Several theories predict a dispersion of the gravitational waves during their
propagation, distorting the signals observed by LIGO and Virgo compared to
their predi... | [
{
"created": "Wed, 9 Jun 2021 14:22:46 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jun 2021 14:08:33 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Jun 2021 15:55:33 GMT",
"version": "v3"
}
] | 2021-06-30 | [
[
"Haegel",
"Leïla",
""
]
] | The direct detection of gravitational waves by ground-based interferometers opened an unprecedented channel to probe alternative theories of gravitation. Several theories predict a dispersion of the gravitational waves during their propagation, distorting the signals observed by LIGO and Virgo compared to their predict... |
gr-qc/0407028 | Carlos Bessa | C. H. G. Bessa and J. A. S. Lima | On the existence of turning points in D-dimensionsal Schwarzschild-de
Sitter and anti-de Sitter spacetimes | 7 pages, no figures, accepted for publication in IJMPD | Int.J.Mod.Phys. D13 (2004) 1217-1222 | 10.1142/S0218271804005341 | null | gr-qc | null | We investigate the motion of a test particle in a d-dimensional, spherically
symmetric and static space-time supported by a mass $M$ plus a $\Lambda$-term.
The motion is strongly dependent on the sign of $\Lambda$. In Schwarzschild-de
Sitter (SdS) space-time ($\Lambda > 0$), besides the physical singularity at
$r=0$ ... | [
{
"created": "Wed, 7 Jul 2004 20:03:30 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bessa",
"C. H. G.",
""
],
[
"Lima",
"J. A. S.",
""
]
] | We investigate the motion of a test particle in a d-dimensional, spherically symmetric and static space-time supported by a mass $M$ plus a $\Lambda$-term. The motion is strongly dependent on the sign of $\Lambda$. In Schwarzschild-de Sitter (SdS) space-time ($\Lambda > 0$), besides the physical singularity at $r=0$ th... |
1704.01476 | Amir Masoud Ghezelbash | A. M. Ghezelbash, V. Kumar | Exact helicoidal and catenoidal solutions in Einstein-Maxwell theory | 16 pages, 8 figures, typos corrected, references added | Phys. Rev. D95, 124045 (2017) | 10.1103/PhysRevD.95.124045 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present several new exact solutions in five and higher dimensional
Einstein-Maxwell theory by embedding the Nutku instanton. The metric functions
for the five-dimensional solutions depend only on a radial coordinate and on
two spatial coordinates for the six and higher dimensional solutions. The six
and higher dim... | [
{
"created": "Wed, 5 Apr 2017 15:16:18 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Apr 2017 11:44:05 GMT",
"version": "v2"
}
] | 2017-10-04 | [
[
"Ghezelbash",
"A. M.",
""
],
[
"Kumar",
"V.",
""
]
] | We present several new exact solutions in five and higher dimensional Einstein-Maxwell theory by embedding the Nutku instanton. The metric functions for the five-dimensional solutions depend only on a radial coordinate and on two spatial coordinates for the six and higher dimensional solutions. The six and higher dimen... |
1302.6506 | Hoang Nguyen | Hoang Ky Nguyen | Toward a theory of curvature-scaling gravity | 68 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A salient feature of Horava gravity is the anisotropic time variable. We
propose an alternative construction of the spacetime manifold which naturally
enables time anisotropy. We promote the role of curvature: the Ricci scalar R
at a given point sets the length scales for physical processes - including
gravity - in t... | [
{
"created": "Tue, 26 Feb 2013 17:24:05 GMT",
"version": "v1"
}
] | 2013-02-27 | [
[
"Nguyen",
"Hoang Ky",
""
]
] | A salient feature of Horava gravity is the anisotropic time variable. We propose an alternative construction of the spacetime manifold which naturally enables time anisotropy. We promote the role of curvature: the Ricci scalar R at a given point sets the length scales for physical processes - including gravity - in the... |
2108.02468 | Oliver Buchmueller | Leonardo Badurina, Oliver Buchmueller, John Ellis, Marek Lewicki,
Christopher McCabe, Ville Vaskonen | Prospective Sensitivities of Atom Interferometers to Gravitational Waves
and Ultralight Dark Matter | Chapter contribution to the theme issue Quantum Technologies in
Particle Physics for publication in Philosophical Transactions of the Royal
Society A. 18 pages and 12 figures | Phil. Trans. R. Soc. A.380 20210060, 2022 | 10.1098/rsta.2021.0060 | AION-REPORT/2021-04, KCL-PH-TH/2021-61, CERN-TH-2021-116 | gr-qc astro-ph.HE hep-ex hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We survey the prospective sensitivities of terrestrial and space-borne atom
interferometers (AIs) to gravitational waves (GWs) generated by cosmological
and astrophysical sources, and to ultralight dark matter. We discuss the
backgrounds from gravitational gradient noise (GGN) in terrestrial detectors,
and also binar... | [
{
"created": "Thu, 5 Aug 2021 09:16:43 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Dec 2021 10:44:26 GMT",
"version": "v2"
}
] | 2021-12-30 | [
[
"Badurina",
"Leonardo",
""
],
[
"Buchmueller",
"Oliver",
""
],
[
"Ellis",
"John",
""
],
[
"Lewicki",
"Marek",
""
],
[
"McCabe",
"Christopher",
""
],
[
"Vaskonen",
"Ville",
""
]
] | We survey the prospective sensitivities of terrestrial and space-borne atom interferometers (AIs) to gravitational waves (GWs) generated by cosmological and astrophysical sources, and to ultralight dark matter. We discuss the backgrounds from gravitational gradient noise (GGN) in terrestrial detectors, and also binary ... |
gr-qc/0308060 | Wung-Hong Huang | Wung-Hong Huang | Effects of the Shear Viscosity on the Character of Cosmological
Evolution | null | J.Math.Phys. 31 (1990) 659-663 | 10.1063/1.528901 | null | gr-qc hep-th | null | Bianchi type I cosmological models are studied that contain a stiff fluid
with a shear viscosity that is a power function of the energy density, such as
$\zeta = \alpha \epsilon^n$. These models are analyzed by describing the
cosmological evolutions as the trajectories in the phase plane of Hubble
functions. The simp... | [
{
"created": "Tue, 19 Aug 2003 15:03:31 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Aug 2003 15:00:42 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Huang",
"Wung-Hong",
""
]
] | Bianchi type I cosmological models are studied that contain a stiff fluid with a shear viscosity that is a power function of the energy density, such as $\zeta = \alpha \epsilon^n$. These models are analyzed by describing the cosmological evolutions as the trajectories in the phase plane of Hubble functions. The simple... |
2406.19224 | David Marcos Andrade Acosta Mr. | Vicente A. Ar\'evalo, David Andrade, Clara Rojas | Time evolution of Von Neumann entropy for a Kerr-Taub-NUT black hole | null | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | In this work, we study the evolution of an evaporating black hole, described
by the Kerr--Taub--NUT metric, which emits scalar particles. We found that
allowing the black hole to radiate massless scalar particles increases the
angular momentum loss rate while decreasing the loss rate of the NUT parameter
and black ho... | [
{
"created": "Thu, 27 Jun 2024 14:49:22 GMT",
"version": "v1"
}
] | 2024-06-28 | [
[
"Arévalo",
"Vicente A.",
""
],
[
"Andrade",
"David",
""
],
[
"Rojas",
"Clara",
""
]
] | In this work, we study the evolution of an evaporating black hole, described by the Kerr--Taub--NUT metric, which emits scalar particles. We found that allowing the black hole to radiate massless scalar particles increases the angular momentum loss rate while decreasing the loss rate of the NUT parameter and black hole... |
gr-qc/0511086 | Mohammad Mansouryar | Mohammad Mansouryar | On a macroscopic traversable spacewarp in practice | 44 pages, 8 Boxes of Figs, typos and one box corrected, one formula
and some links along with some new notes added, some references changed | null | null | null | gr-qc | null | A design of a configuration for violation of the averaged null energy
condition (ANEC) and consequently other classic energy conditions (CECs), is
presented. The methods of producing effective exotic matter (EM) for a
traversable wormhole (TW) are discussed. Also, the approaches of less necessity
of TWs to EM are con... | [
{
"created": "Wed, 16 Nov 2005 13:31:52 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jan 2006 16:50:09 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Mansouryar",
"Mohammad",
""
]
] | A design of a configuration for violation of the averaged null energy condition (ANEC) and consequently other classic energy conditions (CECs), is presented. The methods of producing effective exotic matter (EM) for a traversable wormhole (TW) are discussed. Also, the approaches of less necessity of TWs to EM are consi... |
gr-qc/0206044 | Dr. Haret Rosu | H.C. Rosu, O. Cornejo, M. Reyes, D. Jimenez | Linear second-order differential equations for barotropic FRW
cosmologies | 6 pages, no figures | null | 10.1023/B:IJTP.0000006019.28659.88 | null | gr-qc | null | Simple linear second-order differential equations have been written down for
FRW cosmologies with barotropic fluids by Faraoni. His results have been
extended by Rosu, who employed techniques belonging to nonrelativistic
supersymmetry to obtain time-dependent adiabatic indices. Further extensions
are presented here u... | [
{
"created": "Sat, 15 Jun 2002 23:56:53 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Dec 2002 06:13:29 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Rosu",
"H. C.",
""
],
[
"Cornejo",
"O.",
""
],
[
"Reyes",
"M.",
""
],
[
"Jimenez",
"D.",
""
]
] | Simple linear second-order differential equations have been written down for FRW cosmologies with barotropic fluids by Faraoni. His results have been extended by Rosu, who employed techniques belonging to nonrelativistic supersymmetry to obtain time-dependent adiabatic indices. Further extensions are presented here usi... |
2309.04622 | Hao-Jui Kuan | Hao-Jui Kuan, Kostas D. Kokkotas | The Last Three Seconds: Packed Message delivered by Tides in Binary
Neutron Star Mergers | 8 pages, 2 figures, 3 tables, 1 appendix. Accepted for publication in
PRD | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that the leading-order tidal effects in gravitational waveforms
can be quantified by tidal deformability, while higher order terms, e.g.,
harmonic overtones of Love number and dynamical tides, have not been
well-investigated yet. The concept of a ``form factor'', which is different
from while resembles th... | [
{
"created": "Fri, 8 Sep 2023 22:22:56 GMT",
"version": "v1"
}
] | 2023-09-12 | [
[
"Kuan",
"Hao-Jui",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | It is known that the leading-order tidal effects in gravitational waveforms can be quantified by tidal deformability, while higher order terms, e.g., harmonic overtones of Love number and dynamical tides, have not been well-investigated yet. The concept of a ``form factor'', which is different from while resembles the ... |
gr-qc/0205040 | Edward Malec | Janusz Karkowski, Edward Malec and Zdobyslaw Swierczynski | How loud can Schwarzschild black holes ring? | 4 pages, 5 figures | Acta Phys.Polon. B34 (2003) 59-68 | null | null | gr-qc | null | A numerical procedure is described for the maximization of the energy
diffusion due to the backscattering of the gravitational radiation. The
obtained maxima are solutions dominated by low frequency waves. They give rise
to robust gravitational ringing, with amplitudes of the order of the original
signal.
| [
{
"created": "Fri, 10 May 2002 11:38:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Karkowski",
"Janusz",
""
],
[
"Malec",
"Edward",
""
],
[
"Swierczynski",
"Zdobyslaw",
""
]
] | A numerical procedure is described for the maximization of the energy diffusion due to the backscattering of the gravitational radiation. The obtained maxima are solutions dominated by low frequency waves. They give rise to robust gravitational ringing, with amplitudes of the order of the original signal. |
0805.2503 | Francesco Cianfrani dr | F. Cianfrani, O.M. Lecian, G. Montani | Fundamentals and recent developments in non-perturbative canonical
Quantum Gravity | 95 pages, a section and a new reference have been added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this review is to provide a detailed account of the physical
content emerging from this story of the canonical approach to Quantum Gravity.
All the crucial steps in our presentation have a pedagogical character,
providing the reader with the necessary tools to become involved in the field.
Such a pedagogic... | [
{
"created": "Fri, 16 May 2008 11:43:16 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Jun 2008 14:28:08 GMT",
"version": "v2"
}
] | 2008-06-12 | [
[
"Cianfrani",
"F.",
""
],
[
"Lecian",
"O. M.",
""
],
[
"Montani",
"G.",
""
]
] | The aim of this review is to provide a detailed account of the physical content emerging from this story of the canonical approach to Quantum Gravity. All the crucial steps in our presentation have a pedagogical character, providing the reader with the necessary tools to become involved in the field. Such a pedagogical... |
gr-qc/9605065 | Claus Laemmerzahl | Claus L\"ammerzahl | On the Equivalence Principle in Quantum Theory | 17 pages, LaTex, includes 1 eps figure, To appear in Gen. Rel. Grav | Gen.Rel.Grav. 28 (1996) 1043 | 10.1007/BF02113157 | null | gr-qc | null | The role of the equivalence principle in the context of non-relativistic
quantum mechanics and matter wave interferometry, especially atom beam
interferometry, will be discussed. A generalised form of the weak equivalence
principle which is capable of covering quantum phenomena too, will be proposed.
It is shown that... | [
{
"created": "Wed, 29 May 1996 14:09:14 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Lämmerzahl",
"Claus",
""
]
] | The role of the equivalence principle in the context of non-relativistic quantum mechanics and matter wave interferometry, especially atom beam interferometry, will be discussed. A generalised form of the weak equivalence principle which is capable of covering quantum phenomena too, will be proposed. It is shown that t... |
2402.13360 | Juan M. Z\'arate Pretel | Cl\'esio E. Mota, Juan M. Z. Pretel and C\'esar O. V. Flores | Neutron stars in $f(R,L_m,T)$ gravity | 10 pages, 5 figures. New figures and minor improvements added;
version accepted for publication in EPJC | Eur. Phys. J. C 84 (2024) 673 | 10.1140/epjc/s10052-024-13042-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study explores the behavior of compact stars within the framework of
$f(R,L_m,T)$ gravity, focusing on the functional form $f(R,L_m,T) = R + \alpha
TL_m$. The modified Tolman-Oppenheimer-Volkoff (TOV) equations are derived and
numerically solved for several values of the free parameter $\alpha$ by
considering bo... | [
{
"created": "Tue, 20 Feb 2024 20:34:04 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2024 02:02:42 GMT",
"version": "v2"
}
] | 2024-07-09 | [
[
"Mota",
"Clésio E.",
""
],
[
"Pretel",
"Juan M. Z.",
""
],
[
"Flores",
"César O. V.",
""
]
] | This study explores the behavior of compact stars within the framework of $f(R,L_m,T)$ gravity, focusing on the functional form $f(R,L_m,T) = R + \alpha TL_m$. The modified Tolman-Oppenheimer-Volkoff (TOV) equations are derived and numerically solved for several values of the free parameter $\alpha$ by considering both... |
1801.08344 | Sante Carloni Dr | Stefano Vignolo, Roberto Cianci, Sante Carloni | On the junction conditions in $f(R)$-gravity with torsion | 13 pages | Class.Quant.Grav. 35 (2018) no.9, 095014 | 10.1088/1361-6382/aab6fe | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Junction conditions are discussed within the framework of $f(R)$-gravity with
torsion. After deriving general junction conditions, the cases of coupling to a
Dirac field and a spin fluid are explicitly dealt with. The main differences
with respect to Einstein--Cartan--Sciama--Kibble theory $\left(f(R)=R\right)$
are o... | [
{
"created": "Thu, 25 Jan 2018 10:50:53 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Mar 2018 17:41:31 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Apr 2018 12:19:35 GMT",
"version": "v3"
}
] | 2018-04-20 | [
[
"Vignolo",
"Stefano",
""
],
[
"Cianci",
"Roberto",
""
],
[
"Carloni",
"Sante",
""
]
] | Junction conditions are discussed within the framework of $f(R)$-gravity with torsion. After deriving general junction conditions, the cases of coupling to a Dirac field and a spin fluid are explicitly dealt with. The main differences with respect to Einstein--Cartan--Sciama--Kibble theory $\left(f(R)=R\right)$ are out... |
1102.0616 | Cosimo Bambi | Cosimo Bambi | Constraint on the quadrupole moment of super-massive black hole
candidates from the estimate of the mean radiative efficiency of AGN | 4 pages, 2 figures. v2: refereed version | Phys.Rev.D83:103003,2011 | 10.1103/PhysRevD.83.103003 | IPMU11-0013 | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The super-massive objects at the center of many galaxies are commonly thought
to be black holes. In 4-dimensional general relativity, a black hole is
completely specified by its mass $M$ and by its spin angular momentum $J$. All
the higher multipole moments of the gravitational field depend in a very
specific way on ... | [
{
"created": "Thu, 3 Feb 2011 08:16:37 GMT",
"version": "v1"
},
{
"created": "Tue, 3 May 2011 08:02:02 GMT",
"version": "v2"
}
] | 2011-05-12 | [
[
"Bambi",
"Cosimo",
""
]
] | The super-massive objects at the center of many galaxies are commonly thought to be black holes. In 4-dimensional general relativity, a black hole is completely specified by its mass $M$ and by its spin angular momentum $J$. All the higher multipole moments of the gravitational field depend in a very specific way on th... |
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