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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1609.06794 | Antonino Flachi | Antonino Flachi, Gon\c{c}alo M. Quinta, Jos\'e P. S. Lemos | Black Hole Quantum Vacuum Polarization in Higher Dimensions | 14 pages, 2 Figures | Phys. Rev. D 94, 105001 (2016) | 10.1103/PhysRevD.94.105001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The goal of this paper is to extend to higher dimensionality the methods and
computations of vacuum polarization effects in black hole spacetimes. We focus
our attention on the case of five dimensional Schwarzschild-Tangherlini black
holes, for which we adapt the general method initially developed by Candelas
and lat... | [
{
"created": "Thu, 22 Sep 2016 01:25:20 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Flachi",
"Antonino",
""
],
[
"Quinta",
"Gonçalo M.",
""
],
[
"Lemos",
"José P. S.",
""
]
] | The goal of this paper is to extend to higher dimensionality the methods and computations of vacuum polarization effects in black hole spacetimes. We focus our attention on the case of five dimensional Schwarzschild-Tangherlini black holes, for which we adapt the general method initially developed by Candelas and later... |
0905.0247 | Mahmood Roshan | Mahmood Roshan and Fatimah Shojai | Tracking $f(R)$ cosmology | 2 figures. To appear in Phys. Rev. D | Phys.Rev.D79:103510,2009 | 10.1103/PhysRevD.79.103510 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Metric $f(R)$ gravity theories are conformally equivalent to models of
quintessence in which matter is coupled to dark energy. We derive a condition
for stable tracker solution for metric $f(R)$ gravity in the Einstein frame. We
find that tracker solutions with $-0.361<\omega_{\varphi}<1$ exist if
$0<\Gamma<0.217$ an... | [
{
"created": "Sun, 3 May 2009 07:11:10 GMT",
"version": "v1"
}
] | 2010-04-14 | [
[
"Roshan",
"Mahmood",
""
],
[
"Shojai",
"Fatimah",
""
]
] | Metric $f(R)$ gravity theories are conformally equivalent to models of quintessence in which matter is coupled to dark energy. We derive a condition for stable tracker solution for metric $f(R)$ gravity in the Einstein frame. We find that tracker solutions with $-0.361<\omega_{\varphi}<1$ exist if $0<\Gamma<0.217$ and ... |
1207.1049 | Babak Vakili | B. Vakili and M. A. Gorji | Thermostatistics with minimal length uncertainty relation | 16 pages, 1 figure, minor changes | JSTAT (2012) P10013 | null | null | gr-qc cond-mat.stat-mech quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Existence of minimal length is suggested in any quantum theory of gravity
such as string theory, double special relativity and black hole physics. One
way to impose minimal length is deforming Heisenberg algebra in phase space
which is called Generalized Uncertainty Principle (GUP). In this paper, we
develop statisti... | [
{
"created": "Wed, 4 Jul 2012 16:19:41 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Oct 2012 16:32:33 GMT",
"version": "v2"
}
] | 2012-10-18 | [
[
"Vakili",
"B.",
""
],
[
"Gorji",
"M. A.",
""
]
] | Existence of minimal length is suggested in any quantum theory of gravity such as string theory, double special relativity and black hole physics. One way to impose minimal length is deforming Heisenberg algebra in phase space which is called Generalized Uncertainty Principle (GUP). In this paper, we develop statistica... |
1812.05595 | Pasquale Bosso | Pasquale Bosso, Saurya Das | Lorentz invariant mass and length scales | 10 pages | Int.J.Mod.Phys. D, Vol. 28, No. 04, 1950068 (2019) | 10.1142/S0218271819500688 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the standard Lorentz transformations admit an invariant mass
(length) scale, such as the Planck scale. In other words, the frame
independence of such scale is built-in within those transformations, and one
does not need to invoke the principle of relativity for their invariance. This
automatically ensure... | [
{
"created": "Thu, 13 Dec 2018 18:59:46 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Jan 2019 23:54:39 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Apr 2019 17:48:53 GMT",
"version": "v3"
}
] | 2019-04-17 | [
[
"Bosso",
"Pasquale",
""
],
[
"Das",
"Saurya",
""
]
] | We show that the standard Lorentz transformations admit an invariant mass (length) scale, such as the Planck scale. In other words, the frame independence of such scale is built-in within those transformations, and one does not need to invoke the principle of relativity for their invariance. This automatically ensures ... |
2107.12163 | Riasat Ali | Riasat Ali, Rimsha Babar, Muhammad Asgher, Syed Asif Ali Shah | Gravity Effects on Hawking Radiation from Charged Black Strings in
Rastall Theory | 10 pages, 4 figures, version accepted for publication in Annals of
Physics | null | 10.1016/j.aop.2021.168572 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Rastall theory of gravity is the generalized form of the Einstein theory
which describes the conservation law of energy and momentum tensor. In our
work, we compute the charged black strings solution in the background of
Rastall theory by applying the Newman-Janis approach. After computing the
charged black strin... | [
{
"created": "Mon, 26 Jul 2021 12:30:43 GMT",
"version": "v1"
}
] | 2021-08-25 | [
[
"Ali",
"Riasat",
""
],
[
"Babar",
"Rimsha",
""
],
[
"Asgher",
"Muhammad",
""
],
[
"Shah",
"Syed Asif Ali",
""
]
] | The Rastall theory of gravity is the generalized form of the Einstein theory which describes the conservation law of energy and momentum tensor. In our work, we compute the charged black strings solution in the background of Rastall theory by applying the Newman-Janis approach. After computing the charged black strings... |
1905.10162 | Jorge Ovalle | L. Gabbanelli, J. Ovalle, A. Sotomayor, Z. Stuchlik, R. Casadio | A causal Schwarzschild-de Sitter interior solution by gravitational
decoupling | 15 pages, 6 figures | null | 10.1140/epjc/s10052-019-7022-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We employ the minimal geometric deformation approach to gravitational
decoupling (MGD- decoupling) in order to build an exact anisotropic version of
the Schwarzschild interior solution in a space-time with cosmological constant.
Contrary to the well-known Schwarzschild interior, the matter density in the
new solution... | [
{
"created": "Fri, 24 May 2019 11:42:52 GMT",
"version": "v1"
}
] | 2019-06-26 | [
[
"Gabbanelli",
"L.",
""
],
[
"Ovalle",
"J.",
""
],
[
"Sotomayor",
"A.",
""
],
[
"Stuchlik",
"Z.",
""
],
[
"Casadio",
"R.",
""
]
] | We employ the minimal geometric deformation approach to gravitational decoupling (MGD- decoupling) in order to build an exact anisotropic version of the Schwarzschild interior solution in a space-time with cosmological constant. Contrary to the well-known Schwarzschild interior, the matter density in the new solution i... |
gr-qc/0404040 | Guihua Tian | Liao Liu, Zheng Zhao | Could the Gravitons Have Rest Masses? | null | null | null | null | gr-qc | null | If the cosmological constant $\Lambda $ can not be neglected, we will show in
this short report, that graviton should have a rest mass $m_g=\sqrt{2\Lambda
}=\sqrt{2\Lambda}\hbar c^{-1}$ different from zero.
| [
{
"created": "Fri, 9 Apr 2004 06:13:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Liu",
"Liao",
""
],
[
"Zhao",
"Zheng",
""
]
] | If the cosmological constant $\Lambda $ can not be neglected, we will show in this short report, that graviton should have a rest mass $m_g=\sqrt{2\Lambda }=\sqrt{2\Lambda}\hbar c^{-1}$ different from zero. |
1302.0466 | Mohamad Atazadeh | K. Atazadeh, F. Darabi | Energy conditions in $f(R,G)$ gravity | 10 pages, 6 figures. arXiv admin note: text overlap with
arXiv:1011.4159, arXiv:1012.0953 by other authors | Gen. Relativ. Gravit. (2014) 46:1664 | 10.1007/s10714-014-1664-8 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/3.0/ | Modified gravity is one of the most favorable candidates for explaining the
current accelerating expansion of the Universe. In this regard, we study the
viability of an alternative gravitational theory, namely $f(R,G)$, by imposing
energy conditions. We consider two forms of $f(R,G)$, commonly discussed in the
litera... | [
{
"created": "Sun, 3 Feb 2013 08:51:10 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jan 2014 05:01:10 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Jan 2014 19:43:31 GMT",
"version": "v3"
},
{
"created": "Wed, 29 Jan 2014 20:16:08 GMT",
"version": "v4"
}
] | 2014-01-30 | [
[
"Atazadeh",
"K.",
""
],
[
"Darabi",
"F.",
""
]
] | Modified gravity is one of the most favorable candidates for explaining the current accelerating expansion of the Universe. In this regard, we study the viability of an alternative gravitational theory, namely $f(R,G)$, by imposing energy conditions. We consider two forms of $f(R,G)$, commonly discussed in the literatu... |
gr-qc/0406040 | Jian Qi Shen | Jian Qi Shen | A note: graviton spin, gravitomagnetic fields and self-interaction of
non-inertial frame of reference | 8 pages, 0 figure, Latex. It is a supplement to the paper: Purely
gravitational generalization of spin-rotation couplings, J.Q. Shen, Phys.
Rev. D vol.70: 067501 (2004) | null | null | null | gr-qc | null | Three weak gravitational effects associated with the gravitomagnetic fields
are taken into account in this paper: (i) we discuss the background Lorentz
transformation and gauge transformation in a linearized gravity theory, and
obtain the expression for the spin of gravitational field by using the
canonical procedure... | [
{
"created": "Thu, 10 Jun 2004 11:16:40 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Aug 2004 07:33:11 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Shen",
"Jian Qi",
""
]
] | Three weak gravitational effects associated with the gravitomagnetic fields are taken into account in this paper: (i) we discuss the background Lorentz transformation and gauge transformation in a linearized gravity theory, and obtain the expression for the spin of gravitational field by using the canonical procedure a... |
gr-qc/0610131 | Alessandro Nagar | Alessandro Nagar, Olindo Zanotti, Jose A. Font, Luciano Rezzolla | On the accretion-induced QNM excitation of a Schwarzschild black hole | 15 pages, 12 figures, revised version. To appear in Phys. Rev. D | Phys.Rev.D75:044016,2007 | 10.1103/PhysRevD.75.044016 | null | gr-qc astro-ph | null | By combining the numerical solution of the nonlinear hydrodynamics equations
with the solution of the linear inhomogeneous Zerilli-Moncrief and
Regge-Wheeler equations we investigate the properties of the gravitational
radiation emitted during the axisymmetric accretion of matter onto a
Schwarzschild black hole. The ... | [
{
"created": "Thu, 26 Oct 2006 23:40:37 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Feb 2007 10:42:19 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Nagar",
"Alessandro",
""
],
[
"Zanotti",
"Olindo",
""
],
[
"Font",
"Jose A.",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | By combining the numerical solution of the nonlinear hydrodynamics equations with the solution of the linear inhomogeneous Zerilli-Moncrief and Regge-Wheeler equations we investigate the properties of the gravitational radiation emitted during the axisymmetric accretion of matter onto a Schwarzschild black hole. The ma... |
gr-qc/9701061 | Ali Mostafazadeh | Ali Mostafazadeh | Exact Semiclassical Evolutions in Relativistic and Nonrelativistic
Scalar Quantum Mechanics and Quantum Cosmology | Few minor corrections | Nucl.Phys. B509 (1998) 529-555 | 10.1016/S0550-3213(97)00617-2 | University of Alberta preprint no: Thy -97 | gr-qc hep-th quant-ph | null | The necessary and sufficient conditions for the exactness of the
semiclassical approximation for the solution of the Schr\"odinger and
Klein-Gordon equations are obtained. It is shown that the existence of an exact
semiclassical solution of the Schr\"odinger equation determines both the
semiclassical wave function an... | [
{
"created": "Tue, 28 Jan 1997 19:58:29 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jan 1997 20:22:49 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Jun 1997 20:14:23 GMT",
"version": "v3"
}
] | 2009-10-30 | [
[
"Mostafazadeh",
"Ali",
""
]
] | The necessary and sufficient conditions for the exactness of the semiclassical approximation for the solution of the Schr\"odinger and Klein-Gordon equations are obtained. It is shown that the existence of an exact semiclassical solution of the Schr\"odinger equation determines both the semiclassical wave function and ... |
gr-qc/0507083 | Slava G. Turyshev | James G. Williams, Slava G. Turyshev, and Dale H. Boggs | Lunar Laser Ranging Tests of the Equivalence Principle with the Earth
and Moon | 50 pages, 18 figures, 4 tables | Int.J.Mod.Phys.D18:1129-1175,2009 | 10.1142/S021827180901500X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A primary objective of the Lunar Laser Ranging (LLR) experiment is to provide
precise observations of the lunar orbit that contribute to a wide range of
science investigations. Time series of the highly accurate measurements of the
distance between the Earth and Moon provide unique information used to
determine wheth... | [
{
"created": "Tue, 19 Jul 2005 07:05:34 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jan 2009 07:32:05 GMT",
"version": "v2"
}
] | 2009-07-24 | [
[
"Williams",
"James G.",
""
],
[
"Turyshev",
"Slava G.",
""
],
[
"Boggs",
"Dale H.",
""
]
] | A primary objective of the Lunar Laser Ranging (LLR) experiment is to provide precise observations of the lunar orbit that contribute to a wide range of science investigations. Time series of the highly accurate measurements of the distance between the Earth and Moon provide unique information used to determine whether... |
2310.00210 | Hiroki Matsui | Hiroki Matsui, Shinji Mukohyama | Hartle-Hawking No-boundary Proposal and Ho\v{r}ava-Lifshitz Gravity | 19 pages, 16 figures, v2: final published version | Phys. Rev. D 109, 023504 (2024) | 10.1103/PhysRevD.109.023504 | YITP-23-123, IPMU23-0035 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Hartle-Hawking no-boundary proposal in the framework of
Ho\v{r}ava-Lifshitz gravity. The former is a prominent hypothesis that
describes the quantum creation of the universe, while the latter is a potential
theory of quantum gravity that ensures renormalizability and unitarity, at
least in the so-called ... | [
{
"created": "Sat, 30 Sep 2023 01:19:04 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jan 2024 04:52:36 GMT",
"version": "v2"
}
] | 2024-01-05 | [
[
"Matsui",
"Hiroki",
""
],
[
"Mukohyama",
"Shinji",
""
]
] | We study the Hartle-Hawking no-boundary proposal in the framework of Ho\v{r}ava-Lifshitz gravity. The former is a prominent hypothesis that describes the quantum creation of the universe, while the latter is a potential theory of quantum gravity that ensures renormalizability and unitarity, at least in the so-called pr... |
gr-qc/0406097 | Claus Kiefer | Claus Kiefer | Hawking temperature from quasi-normal modes | 7 pages | Class.Quant.Grav. 21 (2004) L123 | 10.1088/0264-9381/21/17/L02 | null | gr-qc | null | A perturbed black hole has characteristic frequencies (quasi-normal modes).
Here I apply a quantum measurement analysis of the quasi-normal mode frequency
in the limit of high damping. It turns out that a measurement of this mode
necessarily adds noise to it. For a Schwarzschild black hole, this corresponds
exactly t... | [
{
"created": "Thu, 24 Jun 2004 08:30:05 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kiefer",
"Claus",
""
]
] | A perturbed black hole has characteristic frequencies (quasi-normal modes). Here I apply a quantum measurement analysis of the quasi-normal mode frequency in the limit of high damping. It turns out that a measurement of this mode necessarily adds noise to it. For a Schwarzschild black hole, this corresponds exactly to ... |
1003.1027 | Spiros Cotsakis | John D. Barrow, S. Cotsakis, A. Tsokaros | The Construction of Sudden Cosmological Singularities | 3 pages, prd style | null | 10.1142/9789814374552_0325 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Solutions of the Friedmann-Lemaitre cosmological equations of general
relativity have been found with finite-time singularities that are everywhere
regular, have regular Hubble expansion rate, and obey the strong-energy
conditions but possess pressure and acceleration singularities at finite time
that are not associa... | [
{
"created": "Thu, 4 Mar 2010 12:23:30 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Barrow",
"John D.",
""
],
[
"Cotsakis",
"S.",
""
],
[
"Tsokaros",
"A.",
""
]
] | Solutions of the Friedmann-Lemaitre cosmological equations of general relativity have been found with finite-time singularities that are everywhere regular, have regular Hubble expansion rate, and obey the strong-energy conditions but possess pressure and acceleration singularities at finite time that are not associate... |
2108.09407 | Ya-Peng Hu | Haximjan Abdusattar, Shi-Bei Kong, Wen-Long You, Hongsheng Zhang and
Ya-Peng Hu | First Principle Study of Gravitational Pressure and Thermodynamics of
FRW Universe | Some new footnotes added, and version published in JHEP | JHEP12(2022)168 | 10.1007/JHEP12(2022)168 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make a first principle study of gravitational pressure in cosmic
thermodynamics. The pressure is directly derived from the unified first law, in
fact the Einstein field equation in spherically symmetric spacetime. By using
this pressure, we obtain the thermodynamics for the FRW universe, especially
presenting the ... | [
{
"created": "Sat, 21 Aug 2021 00:44:58 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2022 16:14:05 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Oct 2022 15:26:48 GMT",
"version": "v3"
},
{
"created": "Thu, 29 Dec 2022 16:51:54 GMT",
"version": "v4"
}
] | 2023-01-18 | [
[
"Abdusattar",
"Haximjan",
""
],
[
"Kong",
"Shi-Bei",
""
],
[
"You",
"Wen-Long",
""
],
[
"Zhang",
"Hongsheng",
""
],
[
"Hu",
"Ya-Peng",
""
]
] | We make a first principle study of gravitational pressure in cosmic thermodynamics. The pressure is directly derived from the unified first law, in fact the Einstein field equation in spherically symmetric spacetime. By using this pressure, we obtain the thermodynamics for the FRW universe, especially presenting the gr... |
1006.1936 | Valerio Faraoni | Valerio Faraoni and Andres F. Zambrano Moreno (Bishop's University) | Are stealth scalar fields stable? | 10 pages, 1 table, no figures, to appear in Phys. Rev, D | Phys.Rev.D81:124050,2010 | 10.1103/PhysRevD.81.124050 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-gravitating (stealth) scalar fields associated with Minkowski space in
scalar-tensor gravity are examined. Analytical solutions for both non-minimally
coupled scalar field theory and for Brans-Dicke gravity are studied and their
stability with respect to tensor perturbations is assessed using a covariant
and gaug... | [
{
"created": "Thu, 10 Jun 2010 01:42:20 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
],
[
"Moreno",
"Andres F. Zambrano",
"",
"Bishop's University"
]
] | Non-gravitating (stealth) scalar fields associated with Minkowski space in scalar-tensor gravity are examined. Analytical solutions for both non-minimally coupled scalar field theory and for Brans-Dicke gravity are studied and their stability with respect to tensor perturbations is assessed using a covariant and gauge-... |
1808.00801 | Ping Li | Ping-Li, Jia-Cheng Ding, Qi-Qi Fan, Xian-Ru Hu and Jian-Bo Deng | The Varying Speed of Light in Eddington-inspired Born-Infield Gravity
with Rainbow Metric | 20 pages, 5 Figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we proposed that at each point of spacetime, in addition to
the Riemannian metric tensor which describes the geometry of spacetime and the
gravitational field, there is an rainbow metric tensor which shows the geometry
of spacetime depends on the energy of the test particle. Because
Eddington-inspired ... | [
{
"created": "Thu, 2 Aug 2018 13:27:06 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Aug 2018 02:38:32 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Sep 2018 07:18:35 GMT",
"version": "v3"
},
{
"created": "Tue, 18 Sep 2018 01:50:17 GMT",
"version": "v4"
},
{
"cre... | 2019-05-15 | [
[
"Ping-Li",
"",
""
],
[
"Ding",
"Jia-Cheng",
""
],
[
"Fan",
"Qi-Qi",
""
],
[
"Hu",
"Xian-Ru",
""
],
[
"Deng",
"Jian-Bo",
""
]
] | In this paper, we proposed that at each point of spacetime, in addition to the Riemannian metric tensor which describes the geometry of spacetime and the gravitational field, there is an rainbow metric tensor which shows the geometry of spacetime depends on the energy of the test particle. Because Eddington-inspired Bo... |
gr-qc/0505051 | Peter Leifer | P. Leifer and L.P. Horwitz | Field Equations of the CP(N-1) Affine Gauge Theory | LATEX, 20 pages, 6 figures | null | null | null | gr-qc | null | A non-linear relativistic 4D field model of a quantum particle which emerges
from the internal dynamics in the quantum phase space $CP(N-1)$ is proposed. In
this model there is no distinction between `particle' and its `surrounding
field', and the space-time manifold emerges from the description of the quantum
state.... | [
{
"created": "Wed, 11 May 2005 15:58:22 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jul 2006 07:02:11 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Leifer",
"P.",
""
],
[
"Horwitz",
"L. P.",
""
]
] | A non-linear relativistic 4D field model of a quantum particle which emerges from the internal dynamics in the quantum phase space $CP(N-1)$ is proposed. In this model there is no distinction between `particle' and its `surrounding field', and the space-time manifold emerges from the description of the quantum state. T... |
2211.10464 | Laura Olivia Villegas Olvera | Laura O. Villegas, Eduardo Ramirez-Codiz, V\'ictor Jaramillo, Juan
Carlos Degollado, Claudia Moreno, Dar\'io N\'u\~nez and Fernando J.
Romero-Cruz | Determination of the angular momentum of the Kerr black hole from
equatorial geodesic motion | 24 pages | null | 10.1088/1475-7516/2023/08/007 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a method to determine the angular momentum of a black hole, based
on observations of the trajectories of the bodies in the Kerr space-time. We
use the Hamilton equations to describe the dynamics of a particle and present
results for equatorial trajectories, obtaining an algebraic equation for the
magnitude... | [
{
"created": "Fri, 18 Nov 2022 19:04:47 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Mar 2023 05:41:42 GMT",
"version": "v2"
}
] | 2023-08-16 | [
[
"Villegas",
"Laura O.",
""
],
[
"Ramirez-Codiz",
"Eduardo",
""
],
[
"Jaramillo",
"Víctor",
""
],
[
"Degollado",
"Juan Carlos",
""
],
[
"Moreno",
"Claudia",
""
],
[
"Núñez",
"Darío",
""
],
[
"Romero-Cruz",
"Fern... | We present a method to determine the angular momentum of a black hole, based on observations of the trajectories of the bodies in the Kerr space-time. We use the Hamilton equations to describe the dynamics of a particle and present results for equatorial trajectories, obtaining an algebraic equation for the magnitude o... |
1404.0228 | Jakub Mielczarek Ph.D. | Jakub Mielczarek | Big Bang as a critical point | Essay written for the Gravity Research Foundation 2014 Awards for
Essays on Gravitation | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This essay addresses the issue of gravitational phase transitions in the
early universe. We suggest that a second order phase transition observed in the
Causal Dynamical Triangulations approach to quantum gravity may have a
cosmological relevance. The phase transition interpolates between a
non-geometric crumpled pha... | [
{
"created": "Tue, 1 Apr 2014 13:18:32 GMT",
"version": "v1"
}
] | 2014-04-02 | [
[
"Mielczarek",
"Jakub",
""
]
] | This essay addresses the issue of gravitational phase transitions in the early universe. We suggest that a second order phase transition observed in the Causal Dynamical Triangulations approach to quantum gravity may have a cosmological relevance. The phase transition interpolates between a non-geometric crumpled phase... |
1706.00459 | Chris Kavanagh | Chris Kavanagh, Donato Bini, Thibault Damour, Seth Hopper, Adrian C.
Ottewill, Barry Wardell | Spin-orbit precession along eccentric orbits for extreme mass ratio
black hole binaries and its effective-one-body transcription | null | Phys. Rev. D 96, 064012 (2017) | 10.1103/PhysRevD.96.064012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we present an analytical gravitational self-force calculation of
the spin-orbit precession along an eccentric orbit around a Schwarzschild black
hole, following closely the recent prescription of Akcay, Dempsey, and Dolan.
We then transcribe this quantity within the Effective-One-Body (EOB) formalism,
th... | [
{
"created": "Thu, 1 Jun 2017 19:02:41 GMT",
"version": "v1"
}
] | 2017-09-20 | [
[
"Kavanagh",
"Chris",
""
],
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
],
[
"Hopper",
"Seth",
""
],
[
"Ottewill",
"Adrian C.",
""
],
[
"Wardell",
"Barry",
""
]
] | In this work we present an analytical gravitational self-force calculation of the spin-orbit precession along an eccentric orbit around a Schwarzschild black hole, following closely the recent prescription of Akcay, Dempsey, and Dolan. We then transcribe this quantity within the Effective-One-Body (EOB) formalism, ther... |
1209.1945 | Chandrachur Chakraborty | Chandrachur Chakraborty, Partha Pratim Pradhan | Lense-Thirring Precession in Pleba\'nski-Demia\'nski spacetimes | 9 pages, Some special modifications are made | Eur. Phys. J. C (2013) 73:2536 | 10.1140/epjc/s10052-013-2536-1 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An exact expression of Lense-Thirring precession rate is derived for
non-extremal and extremal Pleba\'nski-Demia\'nski spacetimes. This formula is
used to find the exact Lense-Thirring precession rate in various axisymmetric
spacetimes, like: Kerr, Kerr-Newman, Kerr-de Sitter etc. We also show, if the
Kerr parameter ... | [
{
"created": "Mon, 10 Sep 2012 11:14:57 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Apr 2013 16:49:12 GMT",
"version": "v2"
}
] | 2013-09-02 | [
[
"Chakraborty",
"Chandrachur",
""
],
[
"Pradhan",
"Partha Pratim",
""
]
] | An exact expression of Lense-Thirring precession rate is derived for non-extremal and extremal Pleba\'nski-Demia\'nski spacetimes. This formula is used to find the exact Lense-Thirring precession rate in various axisymmetric spacetimes, like: Kerr, Kerr-Newman, Kerr-de Sitter etc. We also show, if the Kerr parameter va... |
1702.05630 | Cl\'ement Stahl | Cl\'ement Stahl | On early and late phases of acceleration of the expansion of the
universe | 172 pages, 38 figures, 9 tables, PhD thesis succesfully defended on
the 23rd january 2017 in Sapienza University of Rome, advisor R. Ruffini,
partially adapted from arXiv:1507.01401, arXiv:1507.01686, Int.J.Mod.Phys.
D25 (2016) no.06, 1650066, arXiv:1602.06556, arXiv:1602.09090,
arXiv:1603.07166, arXiv:1702.031... | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This thesis tackles the vast question of generating accelerated periods of
expansion of the universe. Models loosely related were developed in the early
and late universe. In the early universe, generalizations of the Schwinger
effect were developed in curved (de Sitter) space and some backreaction effects
were estim... | [
{
"created": "Sat, 18 Feb 2017 16:33:08 GMT",
"version": "v1"
}
] | 2017-02-21 | [
[
"Stahl",
"Clément",
""
]
] | This thesis tackles the vast question of generating accelerated periods of expansion of the universe. Models loosely related were developed in the early and late universe. In the early universe, generalizations of the Schwinger effect were developed in curved (de Sitter) space and some backreaction effects were estimat... |
1204.5060 | Mohammad Reza Tanhayi Ahari | M. Fathi, M. Tanhayi-Ahari, M. R. Tanhayi and F. Tavakoli | Radiation effects on particle's trajectory in the linear level | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we first obtain the linear form of the scalar self-force and
then, the effect of self-force on the particle's trajectory is considered. In
de Sitter space-time, within the classical approach, we consider this effect.
Finally, some limits for the problem are presented.
| [
{
"created": "Mon, 23 Apr 2012 13:22:44 GMT",
"version": "v1"
}
] | 2012-04-24 | [
[
"Fathi",
"M.",
""
],
[
"Tanhayi-Ahari",
"M.",
""
],
[
"Tanhayi",
"M. R.",
""
],
[
"Tavakoli",
"F.",
""
]
] | In this work, we first obtain the linear form of the scalar self-force and then, the effect of self-force on the particle's trajectory is considered. In de Sitter space-time, within the classical approach, we consider this effect. Finally, some limits for the problem are presented. |
1903.10370 | Krishnakanta Bhattacharya | Krishnakanta Bhattacharya and Bibhas Ranjan Majhi | Thermogeometric study of van der Waals like phase transition in black
holes: an alternative approach | A few comments added, to appear in Phys. Lett. B | Physics Letters B 802 (2020) 135224 | 10.1016/j.physletb.2020.135224 | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well-known that the non-extremal anti-de-Sitter (AdS) black holes show
various van der Waals type criticalities, such as the $P-V$, $T-S$, $Y-X$,
$Q^2-\Psi$ etc. In these cases, the phase space diagram of the relevant
quantities are similar in behaviour to the isotherms on $P-V$ diagram for the
usual van der Wa... | [
{
"created": "Mon, 25 Mar 2019 14:40:01 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jan 2020 15:03:52 GMT",
"version": "v2"
}
] | 2020-01-23 | [
[
"Bhattacharya",
"Krishnakanta",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
]
] | It is well-known that the non-extremal anti-de-Sitter (AdS) black holes show various van der Waals type criticalities, such as the $P-V$, $T-S$, $Y-X$, $Q^2-\Psi$ etc. In these cases, the phase space diagram of the relevant quantities are similar in behaviour to the isotherms on $P-V$ diagram for the usual van der Waal... |
2001.00027 | Run-Qiu Yang | Run-Qiu Yang and H. Lu | Universal bounds on the size of a black hole | Match the published version | Eur. Phys. J. C 80, 949 (2020) | 10.1140/epjc/s10052-020-08521-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For static black holes in Einstein gravity, if matter fields satisfy a few
general conditions, we conjecture that three characteristic parameters about
the spatial size of black holes, namely the outermost photon sphere area
$A_{\mathrm{ph,out}}$, the corresponding shadow area $A_{\mathrm{sh,out}}$ and
the horizon ar... | [
{
"created": "Tue, 31 Dec 2019 19:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jan 2020 12:10:43 GMT",
"version": "v2"
},
{
"created": "Sun, 18 Oct 2020 07:52:15 GMT",
"version": "v3"
}
] | 2020-10-20 | [
[
"Yang",
"Run-Qiu",
""
],
[
"Lu",
"H.",
""
]
] | For static black holes in Einstein gravity, if matter fields satisfy a few general conditions, we conjecture that three characteristic parameters about the spatial size of black holes, namely the outermost photon sphere area $A_{\mathrm{ph,out}}$, the corresponding shadow area $A_{\mathrm{sh,out}}$ and the horizon area... |
1905.09468 | Muhammad Sharif | M. Sharif and Saadia Mumtaz | Phase Space Analysis for Anisotropic Universe with Nonlinear Bulk
Viscosity | 13 pages, 6 figures. arXiv admin note: text overlap with
arXiv:1702.04716 | Gen. Relativ. Gravit. 50(2018)63 | 10.1007/s10714-018-2384-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we discuss the phase space analysis of locally rotationally
symmetric Bianchi type I universe model by taking a noninteracting mixture of
dust like and viscous radiation like fluid whose viscous pressure satisfies a
nonlinear version of the Israel-Stewart transport equation. An autonomous
system of equ... | [
{
"created": "Tue, 21 May 2019 03:57:37 GMT",
"version": "v1"
}
] | 2019-05-29 | [
[
"Sharif",
"M.",
""
],
[
"Mumtaz",
"Saadia",
""
]
] | In this paper, we discuss the phase space analysis of locally rotationally symmetric Bianchi type I universe model by taking a noninteracting mixture of dust like and viscous radiation like fluid whose viscous pressure satisfies a nonlinear version of the Israel-Stewart transport equation. An autonomous system of equat... |
1810.03008 | Cristian Stelea | Cristian Stelea, Marina-Aura Dariescu and Ciprian Dariescu | New bound of the mass-to-radius ratio for electrically charged stars | 9 pages, 1 figure | Phys. Rev. D 98, 124022 (2018) | 10.1103/PhysRevD.98.124022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a general solution-generating technique for electrically charged
relativistic stars with spherical symmetry, we derive a new bound on the
mass-radius ratio. This compactness bound is based on the already established
bounds for uncharged interior solutions and it will provide the corresponding
generalizations in... | [
{
"created": "Sat, 6 Oct 2018 14:59:56 GMT",
"version": "v1"
}
] | 2018-12-26 | [
[
"Stelea",
"Cristian",
""
],
[
"Dariescu",
"Marina-Aura",
""
],
[
"Dariescu",
"Ciprian",
""
]
] | Using a general solution-generating technique for electrically charged relativistic stars with spherical symmetry, we derive a new bound on the mass-radius ratio. This compactness bound is based on the already established bounds for uncharged interior solutions and it will provide the corresponding generalizations in p... |
1605.01383 | Alejandro Corichi | Alejandro Corichi and Asieh Karami | Loop quantum cosmology of Bianchi IX: Inclusion of inverse triad
corrections | 18 pages, 2 figures. Prepared for the special issue on Loop Quantum
Cosmology of the International Journal of Modern Physics D | Int.J.Mod.Phys. D25 (2016) no.08, 1642011 | 10.1142/S0218271816420116 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the loop quantization of the (diagonal) Bianchi type IX
cosmological model. We explore different quantization prescriptions that extend
the work of Wilson-Ewing and Singh. In particular, we study two different ways
of implementing the so-called inverse triad corrections. We construct the
corresponding Ham... | [
{
"created": "Wed, 4 May 2016 19:09:08 GMT",
"version": "v1"
}
] | 2020-06-18 | [
[
"Corichi",
"Alejandro",
""
],
[
"Karami",
"Asieh",
""
]
] | We consider the loop quantization of the (diagonal) Bianchi type IX cosmological model. We explore different quantization prescriptions that extend the work of Wilson-Ewing and Singh. In particular, we study two different ways of implementing the so-called inverse triad corrections. We construct the corresponding Hamil... |
1602.08110 | Roberto Oliveri | M. Astorino, G. Comp\`ere, R. Oliveri, N. Vandevoorde | Mass of Kerr-Newman Black Holes in an external magnetic field | 21 pages; v2 matches published version | Phys. Rev. D 94, 024019 (2016) | 10.1103/PhysRevD.94.024019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The explicit solution for a Kerr-Newman black hole immersed in an external
magnetic field, sometimes called the Melvin-Kerr-Newman black hole, has been
derived by Ernst and Wild in 1976. In this paper, we clarify the first law and
Smarr formula for black holes in a magnetic field. We then define the unique
mass which... | [
{
"created": "Thu, 25 Feb 2016 21:05:07 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jul 2016 08:30:06 GMT",
"version": "v2"
}
] | 2016-07-13 | [
[
"Astorino",
"M.",
""
],
[
"Compère",
"G.",
""
],
[
"Oliveri",
"R.",
""
],
[
"Vandevoorde",
"N.",
""
]
] | The explicit solution for a Kerr-Newman black hole immersed in an external magnetic field, sometimes called the Melvin-Kerr-Newman black hole, has been derived by Ernst and Wild in 1976. In this paper, we clarify the first law and Smarr formula for black holes in a magnetic field. We then define the unique mass which i... |
gr-qc/0507119 | Filimonova Irina V | E.Babichev, V.Dokuchaev and Y.Eroshenko | Black hole mass decreasing due to phantom energy accretion | Plenary talk presented at Workshop on High Energy Physics&Field
Theory (Protvino, Russia, 2004) | null | null | HEPFT/2004/3 | gr-qc | null | Solution for a stationary spherically symmetric accretion of the relativistic
perfect fluid with an equation of state p(rho) onto the Schwarzschild black
hole is presented. This solution is a generalization of Michel solution and
applicable to the problem of dark energy accretion. It is shown that accretion
of phanto... | [
{
"created": "Thu, 28 Jul 2005 11:24:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Babichev",
"E.",
""
],
[
"Dokuchaev",
"V.",
""
],
[
"Eroshenko",
"Y.",
""
]
] | Solution for a stationary spherically symmetric accretion of the relativistic perfect fluid with an equation of state p(rho) onto the Schwarzschild black hole is presented. This solution is a generalization of Michel solution and applicable to the problem of dark energy accretion. It is shown that accretion of phantom ... |
1907.00740 | Juan Antonio Nieto | J. A. Nieto | Generalized Elko Theory | Latex, 13 pages, published online in Modern Physics Letters A | null | 10.1142/S0217732319502110 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using a totally antisymmetric spinor field we generalize Elko theory. We
compare our proposed theory with traditional totally antisymmetric spinor field
theory based on the Dirac equation. As an application of our formalism we
comment about the possibility to link our generalized Elko theory with
matroids, qubits ... | [
{
"created": "Thu, 27 Jun 2019 19:03:39 GMT",
"version": "v1"
}
] | 2019-07-02 | [
[
"Nieto",
"J. A.",
""
]
] | By using a totally antisymmetric spinor field we generalize Elko theory. We compare our proposed theory with traditional totally antisymmetric spinor field theory based on the Dirac equation. As an application of our formalism we comment about the possibility to link our generalized Elko theory with matroids, qubits an... |
0909.1882 | Henrique de Andrade Gomes | John W. Barrett, Richard J. Dowdall, Winston J. Fairbairn, Henrique
Gomes, Frank Hellmann | A Summary of the asymptotic analysis for the EPRL amplitude | 8pages, Proceedings for Planck Scale 2009, talk given by Henrique
Gomes | null | 10.1063/1.3284398 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the basic steps in building the asymptotic analysis of the
Euclidean sector of new spin foam models using coherent states, for Immirzi
parameter less than one. We focus on conceptual issues and by so doing omit
peripheral proofs and the original discussion on spin structures.
| [
{
"created": "Thu, 10 Sep 2009 18:24:13 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Barrett",
"John W.",
""
],
[
"Dowdall",
"Richard J.",
""
],
[
"Fairbairn",
"Winston J.",
""
],
[
"Gomes",
"Henrique",
""
],
[
"Hellmann",
"Frank",
""
]
] | We review the basic steps in building the asymptotic analysis of the Euclidean sector of new spin foam models using coherent states, for Immirzi parameter less than one. We focus on conceptual issues and by so doing omit peripheral proofs and the original discussion on spin structures. |
gr-qc/9211007 | Ctirad Klimcik | C. Klim\v{c}\'ik and P. Koln\'ik | D=3: Singularities in Gravitational Scattering of Scalar Waves | 22 pages, 5 figures upon request, LaTeX | Class.Quant.Grav.10:1367-1382,1993 | 10.1088/0264-9381/10/7/013 | PRA-HEP-91/8 | gr-qc | null | Family of exact spacetimes of D=3 Einstein gravity interacting with massless
scalar field is obtained by suitable dimensional reduction of a class of D=4
plane-symmetric Einstein vacua. These D=3 spacetimes describe collisions of
line-fronted asymptotically null excitations and are generically singular to
the future.... | [
{
"created": "Wed, 4 Nov 1992 09:11:32 GMT",
"version": "v1"
}
] | 2016-08-14 | [
[
"Klimčík",
"C.",
""
],
[
"Kolník",
"P.",
""
]
] | Family of exact spacetimes of D=3 Einstein gravity interacting with massless scalar field is obtained by suitable dimensional reduction of a class of D=4 plane-symmetric Einstein vacua. These D=3 spacetimes describe collisions of line-fronted asymptotically null excitations and are generically singular to the future. T... |
2109.10940 | Rajesh Karmakar | Rajesh Karmakar, Debaprasad Maity | Ringing Black Hole is Superradiant: Ultra-light Scalar Field | A new section has been added on obsevables effects. Also, few typos
are corrected and some references have been added. Accepted for publication
in Phys. Rev. D | null | 10.1103/PhysRevD.105.104045 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superradiance has been studied quite extensively in the context of static
(charged) and rotating black hole spacetime. In this paper, we report for the
first time that for a minimally coupled scalar field, the absorption
cross-section of a Schwarzschild black hole in its ring down phase can be
superradiant. Our prese... | [
{
"created": "Wed, 22 Sep 2021 18:04:31 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Sep 2021 14:24:37 GMT",
"version": "v2"
},
{
"created": "Mon, 16 May 2022 15:21:02 GMT",
"version": "v3"
}
] | 2022-06-01 | [
[
"Karmakar",
"Rajesh",
""
],
[
"Maity",
"Debaprasad",
""
]
] | Superradiance has been studied quite extensively in the context of static (charged) and rotating black hole spacetime. In this paper, we report for the first time that for a minimally coupled scalar field, the absorption cross-section of a Schwarzschild black hole in its ring down phase can be superradiant. Our present... |
1607.00972 | Luca Fabbri | Luca Fabbri | Torsion Gravity for Dirac Fields | 7 pages | Int.J.Geom.Meth.Mod.Phys.:14,1750037(2017) | 10.1142/S0219887817500372 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we will take into account the most complete back-ground with
torsion and curvature, providing the most exhaustive coupling for the Dirac
field: we will discuss the integrability of the interaction of the matter field
and the reduction of the matter field equations.
| [
{
"created": "Mon, 4 Jul 2016 17:45:30 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Jan 2017 01:33:45 GMT",
"version": "v2"
},
{
"created": "Mon, 22 May 2017 15:21:27 GMT",
"version": "v3"
}
] | 2017-05-23 | [
[
"Fabbri",
"Luca",
""
]
] | In this article we will take into account the most complete back-ground with torsion and curvature, providing the most exhaustive coupling for the Dirac field: we will discuss the integrability of the interaction of the matter field and the reduction of the matter field equations. |
1901.07615 | F. S. Guzman | J. A. Gonzalez, F. S. Guzman | Classification of a black hole spin out of its shadow using support
vector machines | 6 pages, 5 figures. Accepted for publication in Phys. Rev. D | Phys. Rev. D 99, 103002 (2019) | 10.1103/PhysRevD.99.103002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use Support Vector Machines (SVMs) to classify the spin of a black hole.
The SVMs are trained and tested with a catalog of numerically generated images
of black holes, assuming disk and spherical matter models with monochromatic
emission with wavelength of 4mm. We determine the accuracy of the SVM to
classify the ... | [
{
"created": "Tue, 22 Jan 2019 21:19:53 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2019 16:02:05 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Apr 2019 16:38:23 GMT",
"version": "v3"
}
] | 2019-05-22 | [
[
"Gonzalez",
"J. A.",
""
],
[
"Guzman",
"F. S.",
""
]
] | We use Support Vector Machines (SVMs) to classify the spin of a black hole. The SVMs are trained and tested with a catalog of numerically generated images of black holes, assuming disk and spherical matter models with monochromatic emission with wavelength of 4mm. We determine the accuracy of the SVM to classify the sp... |
1906.05309 | Vladimir Strokov N. | Vladimir N. Strokov, Shant Khlghatyan | The Orbital Lense-Thirring Precession in a Strong Field | 23 pages, 6 figures, 2 tables, typeset in arxiv-style; accepted for
publication in General Relativity and Gravitation | Gen Relativ Gravit (2019) 51: 82 | 10.1007/s10714-019-2563-9 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the exact evolution of the orbital angular momentum of a massive
particle in the gravitational field of a Kerr black hole. We show analytically
that, for a wide class of orbits, the angular momentum's hodograph is always
close to a circle. This applies to both bounded and unbounded orbits that do
not end up ... | [
{
"created": "Wed, 12 Jun 2019 18:01:08 GMT",
"version": "v1"
}
] | 2019-07-11 | [
[
"Strokov",
"Vladimir N.",
""
],
[
"Khlghatyan",
"Shant",
""
]
] | We study the exact evolution of the orbital angular momentum of a massive particle in the gravitational field of a Kerr black hole. We show analytically that, for a wide class of orbits, the angular momentum's hodograph is always close to a circle. This applies to both bounded and unbounded orbits that do not end up in... |
2403.17151 | Bahram Mashhoon | Bahram Mashhoon | Rotational Doppler Effect and Spin-Rotation Coupling | 29 pages | null | null | null | gr-qc physics.optics | http://creativecommons.org/licenses/by/4.0/ | The Rotational Doppler Effect (RDE) involves both the orbital angular
momentum of electromagnetic radiation as well as its helicity. The RDE
phenomena associated with photon helicity go beyond the standard theory of
relativity. The purpose of this paper is to elucidate the theoretical basis of
the helicity-dependent ... | [
{
"created": "Mon, 25 Mar 2024 19:59:37 GMT",
"version": "v1"
}
] | 2024-03-27 | [
[
"Mashhoon",
"Bahram",
""
]
] | The Rotational Doppler Effect (RDE) involves both the orbital angular momentum of electromagnetic radiation as well as its helicity. The RDE phenomena associated with photon helicity go beyond the standard theory of relativity. The purpose of this paper is to elucidate the theoretical basis of the helicity-dependent RD... |
gr-qc/9911105 | Osvaldo M. Moreschi | Osvaldo M. Moreschi | Cosmic implications on thermodynamics and the explanation of the so
called horizon problem | 4 pages, 1 figure | null | null | null | gr-qc | null | We show that there are implications on thermodynamics that come from the
existence of the initial cosmic singularity. At present time this is more a
conceptual change than an observable one. However at very early cosmic times
there is a big difference between the actual behavior of thermodynamic
quantities and the be... | [
{
"created": "Fri, 26 Nov 1999 12:57:59 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Nov 1999 12:46:56 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Moreschi",
"Osvaldo M.",
""
]
] | We show that there are implications on thermodynamics that come from the existence of the initial cosmic singularity. At present time this is more a conceptual change than an observable one. However at very early cosmic times there is a big difference between the actual behavior of thermodynamic quantities and the beha... |
1305.7468 | Tim-Torben Paetz | Piotr T. Chru\'sciel, Tim-Torben Paetz | KIDs like cones | 32 pages; improvement of theorem 1.2; short appendix on Fuchsian ODEs
added; section 3.3 and an appendix related to it added, which give a useful
application of our analysis to bifurcate horizons | Class. Quantum Grav. 30 (2013) 235036 | 10.1088/0264-9381/30/23/235036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze vacuum Killing Initial Data on characteristic Cauchy surfaces. A
general theorem on existence of Killing vectors in the domain of dependence is
proved, and some special cases are analyzed in detail, including the case of
bifurcate Killing horizons.
| [
{
"created": "Fri, 31 May 2013 16:00:07 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Oct 2013 10:36:34 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Paetz",
"Tim-Torben",
""
]
] | We analyze vacuum Killing Initial Data on characteristic Cauchy surfaces. A general theorem on existence of Killing vectors in the domain of dependence is proved, and some special cases are analyzed in detail, including the case of bifurcate Killing horizons. |
1703.03920 | Gang Ren | Gang Ren and Yi-Shi Duan | Extended Theory of Harmonic Maps Connects General Relativity to Chaos
and Quantum Mechanism | 8 page, no figures | null | 10.1016/j.chaos.2017.07.004 | null | gr-qc hep-th math-ph math.MP nlin.CD quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity and quantum mechanism are two separate rules of modern
physics explaining how nature works. Both theories are accurate, but the direct
connection between two theories was not yet clarified. Recently, researchers
blur the line between classical and quantum physics by connecting chaos and
entanglemen... | [
{
"created": "Sat, 11 Mar 2017 07:28:32 GMT",
"version": "v1"
}
] | 2017-10-11 | [
[
"Ren",
"Gang",
""
],
[
"Duan",
"Yi-Shi",
""
]
] | General relativity and quantum mechanism are two separate rules of modern physics explaining how nature works. Both theories are accurate, but the direct connection between two theories was not yet clarified. Recently, researchers blur the line between classical and quantum physics by connecting chaos and entanglement.... |
gr-qc/0602056 | Georgios Kraniotis | G. V. Kraniotis | Periapsis and gravitomagnetic precessions of stellar orbits in Kerr and
Kerr-de Sitter black hole spacetimes | LaTeX file, 46 pages, typos fixed, substantial changes, version
published in Classical and Quantum Gravity, Vol 24 (2007) 1775-1808 | Class. Quantum Grav. 24 (2007) 1775-1808 | 10.1088/0264-9381/24/7/007 | MIFP-06-05 | gr-qc astro-ph | null | The exact solution for the motion of a test particle in a non-spherical polar
orbit around a Kerr black hole is derived. Exact novel expressions for frame
dragging (Lense-Thirring effect), periapsis advance and the orbital period are
produced. The resulting formulae, are expressed in terms of Appell's first
hypergeom... | [
{
"created": "Wed, 15 Feb 2006 18:53:25 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Apr 2006 17:37:58 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Sep 2006 18:59:22 GMT",
"version": "v3"
},
{
"created": "Thu, 29 Mar 2007 08:30:26 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Kraniotis",
"G. V.",
""
]
] | The exact solution for the motion of a test particle in a non-spherical polar orbit around a Kerr black hole is derived. Exact novel expressions for frame dragging (Lense-Thirring effect), periapsis advance and the orbital period are produced. The resulting formulae, are expressed in terms of Appell's first hypergeomet... |
0805.0568 | Charmousis | Christos Charmousis | Higher order gravity theories and their black hole solutions | 44 pages, 2 figures, To appear in the proceedings of the 4th Aegean
Summer School on Black Holes, 17-22 September 2007, Mytilene, Island of
Lesvos, Greece | Lect.Notes Phys.769:299-346,2009 | 10.1007/978-3-540-88460-6_8 | LPT-08-42 | gr-qc astro-ph hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a particular higher order gravity theory, Lovelock theory, that
generalises in higher dimensions, general relativity. After briefly motivating
modifications of gravity, we will introduce the theory in question and we will
argue that it is a unique, mathematically sensible, and physically interesting
extens... | [
{
"created": "Mon, 5 May 2008 16:40:26 GMT",
"version": "v1"
}
] | 2009-01-28 | [
[
"Charmousis",
"Christos",
""
]
] | We discuss a particular higher order gravity theory, Lovelock theory, that generalises in higher dimensions, general relativity. After briefly motivating modifications of gravity, we will introduce the theory in question and we will argue that it is a unique, mathematically sensible, and physically interesting extensio... |
2207.03183 | Wei-Chen Lin | Deog Ki Hong, Wei-Chen Lin, Dong-han Yeom | Trouble with geodesics in black-to-white hole bouncing scenarios | 18 pages, 7 figures. (V2: Matching the version accepted by PRD. New
references added.) | null | 10.1103/PhysRevD.106.104011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By utilizing the thin shell approximation, we investigate the behavior of
radial timelike geodesics in a black hole to white hole bouncing scenario with
a mass (de-)amplification relation. We show that those geodesics lose energy
after crossing the transition surface if the white hole mass is less than the
black hole... | [
{
"created": "Thu, 7 Jul 2022 09:23:46 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Nov 2022 06:02:02 GMT",
"version": "v2"
}
] | 2022-11-16 | [
[
"Hong",
"Deog Ki",
""
],
[
"Lin",
"Wei-Chen",
""
],
[
"Yeom",
"Dong-han",
""
]
] | By utilizing the thin shell approximation, we investigate the behavior of radial timelike geodesics in a black hole to white hole bouncing scenario with a mass (de-)amplification relation. We show that those geodesics lose energy after crossing the transition surface if the white hole mass is less than the black hole m... |
1006.2983 | Bijan Saha | Yu.P. Rybakov, G.N. Shikin, Yu.A. Popov and Bijan Saha | Scalar field in cosmology: Potential for isotropization and inflation | 10 pages | Int.J.Theor.Phys.50 (2011) 3421 - 3431 | 10.1007/s10773-011-0847-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The important role of scalar field in cosmology was noticed by a number of
authors. Due to the fact that the scalar field possesses zero spin, it was
basically considered in isotropic cosmological models. If considered in an
anisotropic model, the linear scalar field does not lead to isotropization of
expansion proce... | [
{
"created": "Tue, 15 Jun 2010 13:31:59 GMT",
"version": "v1"
}
] | 2015-05-01 | [
[
"Rybakov",
"Yu. P.",
""
],
[
"Shikin",
"G. N.",
""
],
[
"Popov",
"Yu. A.",
""
],
[
"Saha",
"Bijan",
""
]
] | The important role of scalar field in cosmology was noticed by a number of authors. Due to the fact that the scalar field possesses zero spin, it was basically considered in isotropic cosmological models. If considered in an anisotropic model, the linear scalar field does not lead to isotropization of expansion process... |
gr-qc/9912009 | Bernd Bruegmann | Bernd Bruegmann | Numerical Relativity in 3+1 Dimensions | 23 pages, 5 figures, review talk for Journees Relativistes 1999 | AnnalenPhys.9:227-246,2000 | 10.1002/(SICI)1521-3889(200005)9:3/5<227::AID-ANDP227>3.0.CO;2-D | AEI-1999-40 | gr-qc | null | Numerical relativity is finally approaching a state where the evolution of
rather general (3+1)-dimensional data sets can be computed in order to solve
the Einstein equations. After a general introduction, three topics of current
interest are briefly reviewed: binary black hole mergers, the evolution of
strong gravit... | [
{
"created": "Thu, 2 Dec 1999 14:39:09 GMT",
"version": "v1"
}
] | 2017-09-27 | [
[
"Bruegmann",
"Bernd",
""
]
] | Numerical relativity is finally approaching a state where the evolution of rather general (3+1)-dimensional data sets can be computed in order to solve the Einstein equations. After a general introduction, three topics of current interest are briefly reviewed: binary black hole mergers, the evolution of strong gravitat... |
1904.11602 | Oliver Janssen | Oliver Janssen, Jonathan J. Halliwell and Thomas Hertog | The no-boundary proposal in biaxial Bianchi IX minisuperspace | 49+29 pages, 19 figures | Phys. Rev. D 99, 123531 (2019) | 10.1103/PhysRevD.99.123531 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We implement the no-boundary proposal for the wave function of the universe
in an exactly solvable Bianchi IX minisuperspace model with two scale factors.
We extend our earlier work (Phys. Rev. Lett. 121, 081302, 2018 /
arXiv:1804.01102) to include the contribution from the $\mathbb{C}\text{P}^2
\setminus B^4$ topolo... | [
{
"created": "Thu, 25 Apr 2019 21:46:22 GMT",
"version": "v1"
}
] | 2019-07-03 | [
[
"Janssen",
"Oliver",
""
],
[
"Halliwell",
"Jonathan J.",
""
],
[
"Hertog",
"Thomas",
""
]
] | We implement the no-boundary proposal for the wave function of the universe in an exactly solvable Bianchi IX minisuperspace model with two scale factors. We extend our earlier work (Phys. Rev. Lett. 121, 081302, 2018 / arXiv:1804.01102) to include the contribution from the $\mathbb{C}\text{P}^2 \setminus B^4$ topology... |
0808.1764 | David Garrison | David Garrison | Did Gravitational Waves Affect the Evolution of the Universe? | 14 pages, 1 figure | null | 10.1063/1.3183526 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As Cosmologists struggle to understand the evolution of our universe, an
often over-looked element is the affect of gravitational radiation on the
primordial plasma field. This appears to be due to the inaccurate approximation
of the primordial plasma field as a simple hydrodynamic fluid, therefore
neglecting the ful... | [
{
"created": "Wed, 13 Aug 2008 01:01:23 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jan 2009 23:16:41 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Garrison",
"David",
""
]
] | As Cosmologists struggle to understand the evolution of our universe, an often over-looked element is the affect of gravitational radiation on the primordial plasma field. This appears to be due to the inaccurate approximation of the primordial plasma field as a simple hydrodynamic fluid, therefore neglecting the full ... |
1404.4046 | Herman Telkamp | Herman Telkamp | A relational approach to the Mach-Einstein question | Received honorable mention GRF 2013 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mach's principle is incompatible with general relativity (GR), it has not
condensed into an established theory and suffers from inconsistencies. Yet, the
problem is that Mach's principle is a consequence of Berkeley's notions, which
are as good as irrefutable for their ontological nature. Moreover, the observed
coinc... | [
{
"created": "Tue, 15 Apr 2014 18:35:01 GMT",
"version": "v1"
}
] | 2014-04-17 | [
[
"Telkamp",
"Herman",
""
]
] | Mach's principle is incompatible with general relativity (GR), it has not condensed into an established theory and suffers from inconsistencies. Yet, the problem is that Mach's principle is a consequence of Berkeley's notions, which are as good as irrefutable for their ontological nature. Moreover, the observed coincid... |
0704.2881 | Daisuke Tatsumi | Daisuke Tatsumi, Ryutaro Takahashi, Koji Arai, Noriyasu Nakagawa,
Kazuhiro Agatsuma, Toshitaka Yamazaki, Mitsuhiro Fukushima, Masa-Katsu
Fujimoto, Akiteru Takamori, Alessandro Bertolini, Virginio Sannibale,
Riccardo DeSalvo, Szabolcs Marka, Masaki Ando, Kimio Tsubono, Tomomi Akutsu,
Kazuhiro Yamamoto, Hideki Is... | Current status of Japanese detectors | 6 pages, 5 figures, Proceedings of GWDAW-11 | Class.Quant.Grav.24:S399-S404,2007 | 10.1088/0264-9381/24/19/S03 | null | gr-qc | null | Current status of TAMA and CLIO detectors in Japan is reported in this
article. These two interferometric gravitational-wave detectors are being
developed for the large cryogenic gravitational wave telescope (LCGT) which is
a future plan for detecting gravitational wave signals at least once per year.
TAMA300 is be... | [
{
"created": "Sun, 22 Apr 2007 13:25:17 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Tatsumi",
"Daisuke",
""
],
[
"Takahashi",
"Ryutaro",
""
],
[
"Arai",
"Koji",
""
],
[
"Nakagawa",
"Noriyasu",
""
],
[
"Agatsuma",
"Kazuhiro",
""
],
[
"Yamazaki",
"Toshitaka",
""
],
[
"Fukushima",
"Mitsuhiro",
... | Current status of TAMA and CLIO detectors in Japan is reported in this article. These two interferometric gravitational-wave detectors are being developed for the large cryogenic gravitational wave telescope (LCGT) which is a future plan for detecting gravitational wave signals at least once per year. TAMA300 is being ... |
1110.2159 | Kaca Bradonjic | Ka\'ca Bradonji\'c and John Stachel | Unimodular conformal and projective relativity | 6 pages. To appear in EPL. Abstract shortened. Equation typos fixed.
Two references added since v1 | EPL 97(1) (2012) 10001 | 10.1209/0295-5075/97/10001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We outline unimodular conformal and projective relativity (UCPR), an
extension of unimodular relativity in which the conformal and projective
structures play central roles. Under $SL(4,\mathbb{R})$ symmetry group, the
pseudo-Riemannian metric naturally decomposes into a four-volume element and a
conformal metric; and... | [
{
"created": "Mon, 10 Oct 2011 19:45:27 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Oct 2011 19:50:14 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Nov 2011 19:10:48 GMT",
"version": "v3"
}
] | 2013-07-17 | [
[
"Bradonjić",
"Kaća",
""
],
[
"Stachel",
"John",
""
]
] | We outline unimodular conformal and projective relativity (UCPR), an extension of unimodular relativity in which the conformal and projective structures play central roles. Under $SL(4,\mathbb{R})$ symmetry group, the pseudo-Riemannian metric naturally decomposes into a four-volume element and a conformal metric; and t... |
2005.03771 | Vasil Todorinov | Pasquale Bosso, Saurya Das and Vasil Todorinov | Quantum field theory with the generalized uncertainty principle I:
scalar electrodynamics | Submitted to Annals o Physics | Annals of Physics Volume 422, November 2020, 168319 | 10.1016/j.aop.2020.168319 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the authors presented a covariant extension of the Generalized
Uncertainty Principle (GUP) with a Lorentz invariant minimum length. This opens
the way for constructing and exploring the observable consequences of minimum
length in Relativistic Quantum Field Theories. In particular, we compute
quantum gravit... | [
{
"created": "Thu, 7 May 2020 21:29:48 GMT",
"version": "v1"
}
] | 2021-08-12 | [
[
"Bosso",
"Pasquale",
""
],
[
"Das",
"Saurya",
""
],
[
"Todorinov",
"Vasil",
""
]
] | Recently, the authors presented a covariant extension of the Generalized Uncertainty Principle (GUP) with a Lorentz invariant minimum length. This opens the way for constructing and exploring the observable consequences of minimum length in Relativistic Quantum Field Theories. In particular, we compute quantum gravity ... |
gr-qc/0604049 | Marco Valerio Battisti | Marco Valerio Battisti and Giovanni Montani | Evolutionary Quantum Dynamics of a Generic Universe | 7 pages, to appear on Phys. Lett. B | Phys.Lett. B637 (2006) 203-209 | 10.1016/j.physletb.2006.04.016 | null | gr-qc astro-ph | null | The implications of an Evolutionary Quantum Gravity are addressed in view of
formulating a new dark matter candidate. We consider a Schr\"odinger dynamics
for the gravitational field associated to a generic cosmological model and then
we solve the corresponding eigenvalues problem, inferring its phenomenological
issu... | [
{
"created": "Mon, 10 Apr 2006 16:23:42 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Sep 2007 09:22:32 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Battisti",
"Marco Valerio",
""
],
[
"Montani",
"Giovanni",
""
]
] | The implications of an Evolutionary Quantum Gravity are addressed in view of formulating a new dark matter candidate. We consider a Schr\"odinger dynamics for the gravitational field associated to a generic cosmological model and then we solve the corresponding eigenvalues problem, inferring its phenomenological issue ... |
1408.3062 | Sujoy Modak PhD | Sujoy K. Modak, Leonardo Ort\'iz, Igor Pe\~na and Daniel Sudarsky | Non-Paradoxical Loss of Information in Black Hole Evaporation in a
Quantum Collapse Model | slightly expanded to improve on clarity and completeness, 11 pages, 3
figures, to appear in Physical Review D. arXiv admin note: text overlap with
arXiv:1406.4898 | Physical Review D, 91, 124009 (2015) | 10.1103/PhysRevD.91.124009 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a novel approach to address the black hole information paradox
(BHIP). The idea is based on adapting, to the situation at hand, the modified
versions of quantum theory involving spontaneous stochastic dynamical collapse
of quantum states, which have been considered in attempts to deal with
shortcomings of... | [
{
"created": "Wed, 13 Aug 2014 17:41:06 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Aug 2014 20:57:42 GMT",
"version": "v2"
},
{
"created": "Mon, 18 May 2015 17:28:34 GMT",
"version": "v3"
}
] | 2015-06-05 | [
[
"Modak",
"Sujoy K.",
""
],
[
"Ortíz",
"Leonardo",
""
],
[
"Peña",
"Igor",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | We consider a novel approach to address the black hole information paradox (BHIP). The idea is based on adapting, to the situation at hand, the modified versions of quantum theory involving spontaneous stochastic dynamical collapse of quantum states, which have been considered in attempts to deal with shortcomings of t... |
0801.4671 | Tatyana P. Shestakova | T. P. Shestakova | Quantum cosmological solutions: their dependence on the choice of gauge
conditions and physical interpretation | 11 pages, 6 figures, talk presented at the International Conference
"Physical Interpretations of Relativity Theory - PIRT-2007" (Bauman
University, Moscow, July 2007) | Physical Interpretations of Relativity Theory: Proceedings of
International Meeting (Moscow, 2 - 5 July 2007), eds by M. C. Duffy, V. O.
Gladyshev, A. N. Morozov and P. Rowlands, Moscow, 2007, P. 104 - 112 | null | null | gr-qc | null | In "extended phase space" approach to quantum geometrodynamics numerical
solutions to Schrodinger equation corresponding to various choice of gauge
conditions are obtained for the simplest isotropic model. The "extended phase
space" approach belongs to those appeared in the last decade in which, as a
result of fixing... | [
{
"created": "Wed, 30 Jan 2008 13:15:47 GMT",
"version": "v1"
}
] | 2008-01-31 | [
[
"Shestakova",
"T. P.",
""
]
] | In "extended phase space" approach to quantum geometrodynamics numerical solutions to Schrodinger equation corresponding to various choice of gauge conditions are obtained for the simplest isotropic model. The "extended phase space" approach belongs to those appeared in the last decade in which, as a result of fixing a... |
gr-qc/9805087 | Henk van Elst | Henk van Elst and George F R Ellis (University of Cape Town) | Quasi-Newtonian dust cosmologies | 25 pages, LaTeX 2.09 (10pt), to appear in Classical and Quantum
Gravity, Vol. 15 (1998) | Class.Quant.Grav. 15 (1998) 3545-3573 | 10.1088/0264-9381/15/11/017 | UCT--98001 | gr-qc astro-ph | null | Exact dynamical equations for a generic dust matter source field in a
cosmological context are formulated with respect to a non-comoving
Newtonian-like timelike reference congruence and investigated for internal
consistency. On the basis of a lapse function $N$ (the relativistic
acceleration scalar potential) which e... | [
{
"created": "Fri, 22 May 1998 15:30:22 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 1998 14:21:04 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"van Elst",
"Henk",
"",
"University of Cape Town"
],
[
"Ellis",
"George F R",
"",
"University of Cape Town"
]
] | Exact dynamical equations for a generic dust matter source field in a cosmological context are formulated with respect to a non-comoving Newtonian-like timelike reference congruence and investigated for internal consistency. On the basis of a lapse function $N$ (the relativistic acceleration scalar potential) which evo... |
1708.00426 | Hee-Suk Cho | Hee-Suk Cho and Chang-Hwan Lee | Gravitational Wave Searches for Aligned-Spin Binary Neutron Stars Using
Nonspinning Templates | 4 pages, 2 figures | null | 10.3938/jkps.72.1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study gravitational wave searches for merging binary neutron stars (NSs).
We use nonspinning template waveforms towards the signals emitted from
aligned-spin NS-NS binaries, in which the spins of the NSs are aligned with the
orbital angular momentum. We use the TaylorF2 waveform model, which can
generate inspiral ... | [
{
"created": "Tue, 1 Aug 2017 17:23:08 GMT",
"version": "v1"
}
] | 2018-02-14 | [
[
"Cho",
"Hee-Suk",
""
],
[
"Lee",
"Chang-Hwan",
""
]
] | We study gravitational wave searches for merging binary neutron stars (NSs). We use nonspinning template waveforms towards the signals emitted from aligned-spin NS-NS binaries, in which the spins of the NSs are aligned with the orbital angular momentum. We use the TaylorF2 waveform model, which can generate inspiral wa... |
2303.07562 | Hyerim Noh | Jai-chan Hwang and Hyerim Noh | Definition of electric and magnetic fields in curved spacetime | 6 pages, no figure, published version in Annals of Physics | null | 10.1016/j.aop.2023.169332 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Defining the electric and magnetic field vectors in curved spacetime requires
a proper choice of the observer's frame four-vector. Related literature shows
that this fundamental issue in physics still needs to be properly resolved. In
recent literature on using electromagnetic means to detect gravitational waves,
an ... | [
{
"created": "Tue, 14 Mar 2023 01:02:48 GMT",
"version": "v1"
},
{
"created": "Sat, 6 May 2023 12:00:41 GMT",
"version": "v2"
}
] | 2023-05-24 | [
[
"Hwang",
"Jai-chan",
""
],
[
"Noh",
"Hyerim",
""
]
] | Defining the electric and magnetic field vectors in curved spacetime requires a proper choice of the observer's frame four-vector. Related literature shows that this fundamental issue in physics still needs to be properly resolved. In recent literature on using electromagnetic means to detect gravitational waves, an ad... |
0707.4362 | Guillermo A. Mena Marugan | Pablo Galan, Luis J. Garay, Guillermo A. Mena Marugan | Quantum time uncertainty in Schwarzschild-anti-de Sitter black holes | 10 pages, version published in Physical Review D | Phys.Rev.D76:044014,2007 | 10.1103/PhysRevD.76.044014 | null | gr-qc | null | The combined action of gravity and quantum mechanics gives rise to a minimum
time uncertainty in the lowest order approximation of a perturbative scheme, in
which quantum effects are regarded as corrections to the classical spacetime
geometry. From the nonperturbative point of view, both gravity and quantum
mechanics... | [
{
"created": "Mon, 30 Jul 2007 09:28:22 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Aug 2007 10:31:28 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Galan",
"Pablo",
""
],
[
"Garay",
"Luis J.",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
]
] | The combined action of gravity and quantum mechanics gives rise to a minimum time uncertainty in the lowest order approximation of a perturbative scheme, in which quantum effects are regarded as corrections to the classical spacetime geometry. From the nonperturbative point of view, both gravity and quantum mechanics a... |
gr-qc/0406016 | Yuri Obukhov | Yu.N. Obukhov, T. Vargas | Goedel type solution in teleparallel gravity | Revtex, 15 pages, no figures, to appear in Phys. Lett. A | Phys.Lett. A327 (2004) 365-373 | 10.1016/j.physleta.2004.06.003 | null | gr-qc | null | The stationary cosmological model without closed timelike curves of G\"odel
type is obtained for the ideal dust matter source within the framework of the
teleparallel gravity. For a specific choice of the teleparallel gravity
parameters, this solution reproduces the causality violating stationary G\"odel
solution in ... | [
{
"created": "Fri, 4 Jun 2004 13:33:38 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Obukhov",
"Yu. N.",
""
],
[
"Vargas",
"T.",
""
]
] | The stationary cosmological model without closed timelike curves of G\"odel type is obtained for the ideal dust matter source within the framework of the teleparallel gravity. For a specific choice of the teleparallel gravity parameters, this solution reproduces the causality violating stationary G\"odel solution in ge... |
2004.06635 | James B. Hartle | James B. Hartle and Kristen Schleich | The Conformal Rotation in Linearised Gravity | A pre-arXiv paper posted for betterr accessibility, 20 pages, revtex4 | in Quantum Field Theory and Quantum Statistics (edited by I. A.
Batalin, C. J. Isham and G. A. Vilkovisky), Adam Hilger, Bristol, (1987 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the quantum mechanics of Einstein gravity linearised about flat
spacetime. The two transverse-traceless components of the metric perturbation
are the true physical degrees of freedom. They appear in the quantum theory as
free quantum fields. Like the full Einstein action, the Euclidean action for
linearis... | [
{
"created": "Tue, 14 Apr 2020 16:24:06 GMT",
"version": "v1"
}
] | 2020-04-15 | [
[
"Hartle",
"James B.",
""
],
[
"Schleich",
"Kristen",
""
]
] | We consider the quantum mechanics of Einstein gravity linearised about flat spacetime. The two transverse-traceless components of the metric perturbation are the true physical degrees of freedom. They appear in the quantum theory as free quantum fields. Like the full Einstein action, the Euclidean action for linearised... |
1912.03770 | Adamantia Zampeli | Adamantia Zampeli | Emergence of classicality from an inhomogeneous quantum universe | Prepared for the proceedings of the 2nd Domodossola summer school | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a short account of the quantisation of the Szekeres spacetime by
considering the symmetries of a reduced action principle. This is an
alternative approach than the one followed in the literature for the study of
inhomogeneities, which is usually based on perturbations of an inhomogeneous
field on the spacetim... | [
{
"created": "Sun, 8 Dec 2019 21:55:00 GMT",
"version": "v1"
}
] | 2019-12-10 | [
[
"Zampeli",
"Adamantia",
""
]
] | We give a short account of the quantisation of the Szekeres spacetime by considering the symmetries of a reduced action principle. This is an alternative approach than the one followed in the literature for the study of inhomogeneities, which is usually based on perturbations of an inhomogeneous field on the spacetime ... |
gr-qc/0607059 | Gianluca Calcagni | Gianluca Calcagni, Marina Cortes | Inflationary scalar spectrum in loop quantum cosmology | 29 pages, 2 figures. v2: typos corrected, discussion improved and
extended, new section added. Conclusions are unchanged | Class.Quant.Grav. 24 (2007) 829-854 | 10.1088/0264-9381/24/4/005 | null | gr-qc astro-ph hep-th | null | In the context of loop quantum cosmology, we consider an inflationary era
driven by a canonical scalar field and occurring in the semiclassical regime,
where spacetime is a continuum but quantum gravitational effects are important.
The spectral amplitude and index of scalar perturbations on an unperturbed de
Sitter b... | [
{
"created": "Fri, 14 Jul 2006 18:23:43 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jul 2006 19:52:50 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Jan 2007 10:35:29 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Calcagni",
"Gianluca",
""
],
[
"Cortes",
"Marina",
""
]
] | In the context of loop quantum cosmology, we consider an inflationary era driven by a canonical scalar field and occurring in the semiclassical regime, where spacetime is a continuum but quantum gravitational effects are important. The spectral amplitude and index of scalar perturbations on an unperturbed de Sitter bac... |
gr-qc/9810087 | Philip Mannheim | Philip D. Mannheim (University of Connecticut) | The equivalence principle in classical mechanics and quantum mechanics | LaTeX, 21 pages. Expanded Final Version. To appear in "Contemporary
Fundamental Problems", Ed. Valeri Dvoeglazov (Nova Science Publishers),
Spring 2000 | null | null | null | gr-qc | null | We discuss our understanding of the equivalence principle in both classical
mechanics and quantum mechanics. We show that not only does the equivalence
principle hold for the trajectories of quantum particles in a background
gravitational field, but also that it is only because of this that the
equivalence principle ... | [
{
"created": "Thu, 29 Oct 1998 19:19:22 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2000 20:34:40 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Mannheim",
"Philip D.",
"",
"University of Connecticut"
]
] | We discuss our understanding of the equivalence principle in both classical mechanics and quantum mechanics. We show that not only does the equivalence principle hold for the trajectories of quantum particles in a background gravitational field, but also that it is only because of this that the equivalence principle is... |
0807.2990 | Wlodzimierz Piechocki | Przemyslaw Malkiewicz and Wlodzimierz Piechocki | Excited states of a string in a time dependent orbifold | Version accepted for publication in Class. Quantum Grav | Class.Quant.Grav.26:015008,2009 | 10.1088/0264-9381/26/1/015008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present analytical results on the propagation of a classical string in
non-zero modes through the singularity of the compactified Milne space. We
restrict our analysis to a string winding around the compact dimension of
spacetime. The compact dimension undergoes contraction to a point followed by
re-expansion. We ... | [
{
"created": "Fri, 18 Jul 2008 15:25:00 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Oct 2008 11:07:42 GMT",
"version": "v2"
},
{
"created": "Sat, 8 Nov 2008 08:52:17 GMT",
"version": "v3"
}
] | 2008-12-25 | [
[
"Malkiewicz",
"Przemyslaw",
""
],
[
"Piechocki",
"Wlodzimierz",
""
]
] | We present analytical results on the propagation of a classical string in non-zero modes through the singularity of the compactified Milne space. We restrict our analysis to a string winding around the compact dimension of spacetime. The compact dimension undergoes contraction to a point followed by re-expansion. We de... |
2010.04040 | Gilberto Medeiros Kremer | Gilberto M. Kremer and Leandro C. Mehret | Post-Newtonian Spherically Symmetrical Accretion | To appear in PRD | Phys. Rev. D 104, 024056 (2021) | 10.1103/PhysRevD.104.024056 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The objetive of this work is to investigate the influence of the corrections
to the spherical symmetrical accretion of an infinity gas cloud characterized
by a polytropic equation into a massive object due to the post-Newtonian
approximation.The post-Newtonian corrections to the critical values of the flow
velocity, ... | [
{
"created": "Thu, 8 Oct 2020 15:08:07 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jun 2021 20:42:57 GMT",
"version": "v2"
}
] | 2021-07-28 | [
[
"Kremer",
"Gilberto M.",
""
],
[
"Mehret",
"Leandro C.",
""
]
] | The objetive of this work is to investigate the influence of the corrections to the spherical symmetrical accretion of an infinity gas cloud characterized by a polytropic equation into a massive object due to the post-Newtonian approximation.The post-Newtonian corrections to the critical values of the flow velocity, so... |
0808.2101 | Sunil Maharaj | S. S. Rajah, S.D. Maharaj | A Riccati equation in radiative stellar collapse | 13 pages, To appear in J. Math. Phys | J.Math.Phys.49:012501,2008 | 10.1063/1.2832628 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We model the behaviour of a relativistic spherically symmetric shearing fluid
undergoing gravitational collapse with heat flux. It is demonstrated that the
governing equation for the gravitational behaviour is a Riccati equation. We
show that the Riccati equation admits two classes of new solutions in closed
form. We... | [
{
"created": "Fri, 15 Aug 2008 06:53:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Rajah",
"S. S.",
""
],
[
"Maharaj",
"S. D.",
""
]
] | We model the behaviour of a relativistic spherically symmetric shearing fluid undergoing gravitational collapse with heat flux. It is demonstrated that the governing equation for the gravitational behaviour is a Riccati equation. We show that the Riccati equation admits two classes of new solutions in closed form. We r... |
0909.1589 | David Kubiznak | David Kubiznak | Black hole spacetimes with Killing-Yano symmetries | 6 pages, no figures, prepared for the proceedings of the ICMP 09,
v2:upgraded references | null | 10.1142/9789814304634_0052 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a brief overview of black hole spacetimes admitting Killing-Yano
tensors. In vacuum these include Kerr-NUT-(A)dS metrics and certain black brane
solutions. In the presence of matter fields, (conformal) Killing-Yano
symmetries are known to exist for the Plebanski-Demianski solution and
(trivially) for any s... | [
{
"created": "Tue, 8 Sep 2009 22:26:23 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Nov 2009 16:27:11 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Kubiznak",
"David",
""
]
] | We present a brief overview of black hole spacetimes admitting Killing-Yano tensors. In vacuum these include Kerr-NUT-(A)dS metrics and certain black brane solutions. In the presence of matter fields, (conformal) Killing-Yano symmetries are known to exist for the Plebanski-Demianski solution and (trivially) for any spa... |
1504.05356 | Roberto Casadio | Roberto Casadio, Andrea Giugno, Alessio Orlandi | Thermal corpuscular black holes | PDFLaTeX, 15 pages, 2 figure. Version to appear in PRD | Phys. Rev. D 91, 124069 (2015) | 10.1103/PhysRevD.91.124069 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the corpuscular model of an evaporating black hole consisting of a
specific quantum state for a large number $N$ of self-confined bosons. The
single-particle spectrum contains a discrete ground state of energy $m$
(corresponding to toy gravitons forming the black hole), and a gapless
continuous spectrum (to ... | [
{
"created": "Tue, 21 Apr 2015 09:37:18 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jun 2015 06:36:53 GMT",
"version": "v2"
}
] | 2015-07-01 | [
[
"Casadio",
"Roberto",
""
],
[
"Giugno",
"Andrea",
""
],
[
"Orlandi",
"Alessio",
""
]
] | We study the corpuscular model of an evaporating black hole consisting of a specific quantum state for a large number $N$ of self-confined bosons. The single-particle spectrum contains a discrete ground state of energy $m$ (corresponding to toy gravitons forming the black hole), and a gapless continuous spectrum (to ac... |
0903.2670 | Mohammad Vahid Takook | M.V. Takook and M.R. Tanhayi | Linear Weyl Gravity in de Sitter Universe | 13 pages, some details added, typos corrected, reference added | JHEP 1012:044,2010 | 10.1007/JHEP12(2010)044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we obtain the linear Weyl gravity in de Sitter background. Its
linear form in five-dimensional ambient space notation has also been obtained.
From the group theoretical point of view, we show that this conformal invariant
fourth order theory in its linear form does not transform as an unitary
irreducibl... | [
{
"created": "Sun, 15 Mar 2009 21:53:21 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Sep 2010 07:26:52 GMT",
"version": "v2"
}
] | 2010-12-23 | [
[
"Takook",
"M. V.",
""
],
[
"Tanhayi",
"M. R.",
""
]
] | In this paper we obtain the linear Weyl gravity in de Sitter background. Its linear form in five-dimensional ambient space notation has also been obtained. From the group theoretical point of view, we show that this conformal invariant fourth order theory in its linear form does not transform as an unitary irreducible ... |
2311.04602 | Bobir Toshmatov | Bobir Toshmatov and Bobomurat Ahmedov | Tidal forces in parametrized spacetime: Rezzolla-Zhidenko
parametrization | 13 pages, 13 figures | Phys. Rev. D 108, 084035 (2023) | 10.1103/PhysRevD.108.084035 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | We investigate the tidal forces exerted by a spherically symmetric static
parametrized black hole. Our analysis reveals that the radial and angular
components of the tidal forces exerted by the black hole can exhibit both
positive and negative values near the black hole, depending on matters of the
spacetime paramete... | [
{
"created": "Wed, 8 Nov 2023 11:07:53 GMT",
"version": "v1"
}
] | 2023-11-09 | [
[
"Toshmatov",
"Bobir",
""
],
[
"Ahmedov",
"Bobomurat",
""
]
] | We investigate the tidal forces exerted by a spherically symmetric static parametrized black hole. Our analysis reveals that the radial and angular components of the tidal forces exerted by the black hole can exhibit both positive and negative values near the black hole, depending on matters of the spacetime parameters... |
2201.06489 | Arnab Sarkar | Shashank S. Pandey, Arnab Sarkar, Amna Ali, and A. S. Majumdar | Effect of inhomogeneities on the propagation of gravitational waves from
binaries of compact objects | 8 pages, 5 figures | JCAP06(2022)021 | 10.1088/1475-7516/2022/06/021 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the propagation of gravitational waves in the late time Universe
with the presence of structure. Before detection, gravitational waves emitted
from distant sources have to traverse through regions of spacetime which are
far from smooth and homogeneous. We investigate the effect of inhomogeneities
on the o... | [
{
"created": "Mon, 17 Jan 2022 16:01:36 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jan 2022 16:30:36 GMT",
"version": "v2"
},
{
"created": "Sat, 23 Apr 2022 14:47:10 GMT",
"version": "v3"
},
{
"created": "Fri, 24 Jun 2022 16:00:23 GMT",
"version": "v4"
}
] | 2022-06-27 | [
[
"Pandey",
"Shashank S.",
""
],
[
"Sarkar",
"Arnab",
""
],
[
"Ali",
"Amna",
""
],
[
"Majumdar",
"A. S.",
""
]
] | We consider the propagation of gravitational waves in the late time Universe with the presence of structure. Before detection, gravitational waves emitted from distant sources have to traverse through regions of spacetime which are far from smooth and homogeneous. We investigate the effect of inhomogeneities on the obs... |
1310.5335 | Mart\'in G. Richarte MR | Luis P. Chimento, Mart\'in G. Richarte, and Iv\'an E. S\'anchez
Garc\'ia | Interacting dark sector with variable vacuum energy | 5 pages,3 figures, 2 tables.
(http://prd.aps.org/abstract/PRD/v88/i8/e087301) | Phys. Rev. D 88, 087301 (2013) | 10.1103/PhysRevD.88.087301 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine a cosmological scenario where dark matter is coupled to a variable
vacuum energy while baryons and photons are two decoupled components for a
spatially flat Friedmann-Robertson-Walker spacetime. We apply the $\chi^{2}$
method to the updated observational Hubble data for constraining the
cosmological parame... | [
{
"created": "Sun, 20 Oct 2013 14:56:40 GMT",
"version": "v1"
}
] | 2016-04-01 | [
[
"Chimento",
"Luis P.",
""
],
[
"Richarte",
"Martín G.",
""
],
[
"García",
"Iván E. Sánchez",
""
]
] | We examine a cosmological scenario where dark matter is coupled to a variable vacuum energy while baryons and photons are two decoupled components for a spatially flat Friedmann-Robertson-Walker spacetime. We apply the $\chi^{2}$ method to the updated observational Hubble data for constraining the cosmological paramete... |
0902.3416 | Alejandro Perez | Danilo Jimenez Rezende, and Alejandro Perez | 4d Lorentzian Holst action with topological terms | null | Phys.Rev.D79:064026,2009 | 10.1103/PhysRevD.79.064026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Hamiltonian formulation of the general first order action of
general relativity compatible with local Lorentz invariance and background
independence. The most general simplectic structure (compatible with
diffeomorphism invariance and local Lorentz transformations) is obtained by
adding to the Holst acti... | [
{
"created": "Thu, 19 Feb 2009 17:20:26 GMT",
"version": "v1"
}
] | 2010-01-15 | [
[
"Rezende",
"Danilo Jimenez",
""
],
[
"Perez",
"Alejandro",
""
]
] | We study the Hamiltonian formulation of the general first order action of general relativity compatible with local Lorentz invariance and background independence. The most general simplectic structure (compatible with diffeomorphism invariance and local Lorentz transformations) is obtained by adding to the Holst action... |
1708.00271 | Hugo Ferreira | Francesco Bussola, Claudio Dappiaggi, Hugo R. C. Ferreira, Igor
Khavkine | Ground state for a massive scalar field in BTZ spacetime with Robin
boundary conditions | 17 pages, 3 figures | Phys. Rev. D 96, 105016 (2017) | 10.1103/PhysRevD.96.105016 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a real, massive scalar field in BTZ spacetime, a 2+1-dimensional
black hole solution of the Einstein's field equations with a negative
cosmological constant. First, we analyze the space of classical solutions in a
mode decomposition and we characterize the collection of all admissible
boundary conditions ... | [
{
"created": "Tue, 1 Aug 2017 12:12:37 GMT",
"version": "v1"
}
] | 2017-11-29 | [
[
"Bussola",
"Francesco",
""
],
[
"Dappiaggi",
"Claudio",
""
],
[
"Ferreira",
"Hugo R. C.",
""
],
[
"Khavkine",
"Igor",
""
]
] | We consider a real, massive scalar field in BTZ spacetime, a 2+1-dimensional black hole solution of the Einstein's field equations with a negative cosmological constant. First, we analyze the space of classical solutions in a mode decomposition and we characterize the collection of all admissible boundary conditions of... |
0706.1319 | Luis Lehner | Luis Lehner and Osvaldo M. Moreschi | Dealing with delicate issues in waveforms calculations | null | Phys.Rev.D76:124040,2007 | 10.1103/PhysRevD.76.124040 | null | gr-qc | null | We revisit the calculation of gravitational radiation through the use of Weyl
scalars. We point out several possible problems arising from gauge and tetrad
ambiguities and ways to address them. Our analysis indicates how, relatively
simple corrections can be introduced to remove these ambiguities.
| [
{
"created": "Sat, 9 Jun 2007 16:20:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lehner",
"Luis",
""
],
[
"Moreschi",
"Osvaldo M.",
""
]
] | We revisit the calculation of gravitational radiation through the use of Weyl scalars. We point out several possible problems arising from gauge and tetrad ambiguities and ways to address them. Our analysis indicates how, relatively simple corrections can be introduced to remove these ambiguities. |
1109.0118 | Giacomo Mauro D'Ariano Prof. | Giacomo Mauro D'Ariano and Alessandro Tosini | Emergence of Space-Time from Topologically Homogeneous Causal Networks | This manuscript supersedes arXiv:1008.4805v1. Submitted to Studies in
History and Philosophy of Modern Physics special Issue on Emergent Space-Time | Studies in History and Philosophy of Modern Physics, 44 (2013) | 10.1016/j.shpsb.2013.04.003 | null | gr-qc hep-lat quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the emergence of Minkowski space-time from a causal network.
Differently from previous approaches, we require the network to be
topologically homogeneous, so that the metric is derived from pure
event-counting. Emergence from events has an operational motivation in
requiring that every physical quantity---in... | [
{
"created": "Thu, 1 Sep 2011 08:01:29 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jul 2012 14:21:35 GMT",
"version": "v2"
}
] | 2016-01-26 | [
[
"D'Ariano",
"Giacomo Mauro",
""
],
[
"Tosini",
"Alessandro",
""
]
] | We study the emergence of Minkowski space-time from a causal network. Differently from previous approaches, we require the network to be topologically homogeneous, so that the metric is derived from pure event-counting. Emergence from events has an operational motivation in requiring that every physical quantity---incl... |
gr-qc/0207059 | Sergio De Filippo | Sergio De Filippo, Filippo Maimone | Nonunitary Classically Stable HD Gravity | 6 pages, to appear in Proceedings of the First International
Conference on Quantum Limits to the Second Law, July 29-31, 2002, University
of San Diego, San Diego, CA | AIP Conf.Proc. 643 (2003) 373-378 | null | null | gr-qc | null | Classical instability in fourth order gravity is cured at the expense of
unitarity. The appearance of hidden degrees of freedom replicating those of
ordinary matter allows for ordinary thermodynamic entropy and black hole
entropy to be identified with von Neumann entropy. The emergent picture gives a
substantial agre... | [
{
"created": "Tue, 16 Jul 2002 10:05:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"De Filippo",
"Sergio",
""
],
[
"Maimone",
"Filippo",
""
]
] | Classical instability in fourth order gravity is cured at the expense of unitarity. The appearance of hidden degrees of freedom replicating those of ordinary matter allows for ordinary thermodynamic entropy and black hole entropy to be identified with von Neumann entropy. The emergent picture gives a substantial agreem... |
1205.6121 | Arindam Lala | Arindam Lala | Critical phenomena in higher curvature charged AdS black holes | LaTex, 29 pages, 14 figures, modified version, accepted for
publication in the Advances in High Energy Physics | Advances in High Energy Physics, Volume 2013, Article ID 918490 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we have studied the critical phenomena in higher curvature
charged black holes in the anti-de Sitter (AdS) space-time. As an example we
have considered the third order Lovelock-Born-Infeld black holes in AdS
space-time. We have analytically derived the thermodynamic quantities of the
system. Our analysi... | [
{
"created": "Mon, 28 May 2012 14:11:44 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Sep 2013 12:25:11 GMT",
"version": "v2"
}
] | 2013-12-20 | [
[
"Lala",
"Arindam",
""
]
] | In this paper we have studied the critical phenomena in higher curvature charged black holes in the anti-de Sitter (AdS) space-time. As an example we have considered the third order Lovelock-Born-Infeld black holes in AdS space-time. We have analytically derived the thermodynamic quantities of the system. Our analysis ... |
gr-qc/0402037 | Hironobu Furuhashi | Hironobu Furuhashi, Yasusada Nambu | Instability of Massive Scalar Fields in Kerr-Newman Spacetime | 15 pages, 10 figures. Accepted for publication in Prog.Theor.Phys | Prog.Theor.Phys. 112 (2004) 983-995 | 10.1143/PTP.112.983 | DPNU-03-28 | gr-qc | null | We investigate the instability of charged massive scalar fields in
Kerr-Newman spacetime. Due to the super-radiant effect of the background
geometry, the bound state of the scalar field is unstable, and its amplitude
grows in time. By solving the Klein-Gordon equation of the scalar field as an
eigenvalue problem, we ... | [
{
"created": "Fri, 6 Feb 2004 18:13:18 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Dec 2004 05:32:27 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Furuhashi",
"Hironobu",
""
],
[
"Nambu",
"Yasusada",
""
]
] | We investigate the instability of charged massive scalar fields in Kerr-Newman spacetime. Due to the super-radiant effect of the background geometry, the bound state of the scalar field is unstable, and its amplitude grows in time. By solving the Klein-Gordon equation of the scalar field as an eigenvalue problem, we nu... |
2303.07424 | Dhruba Jyoti Gogoi Dr. | Dhruba Jyoti Gogoi, Ali \"Ovg\"un and M. Koussour | Quasinormal Modes of Black holes in $f(Q)$ gravity | 15 pages, 6 figures. Published version | Eur. Phys. J. C 83, 700 (2023) | 10.1140/epjc/s10052-023-11881-5 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we have studied the quasinormal modes of a black hole in a
model of the type $f(Q)=\underset{n}{\sum}a_{n}\left(Q-Q_{0}\right)^{n} $ in
$f(Q)$ gravity by using a recently introduced method known as Bernstein
spectral method and confirmed the validity of the method with the help of well
known Pad\'e aver... | [
{
"created": "Mon, 13 Mar 2023 19:00:41 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Sep 2023 18:05:23 GMT",
"version": "v2"
}
] | 2023-09-06 | [
[
"Gogoi",
"Dhruba Jyoti",
""
],
[
"Övgün",
"Ali",
""
],
[
"Koussour",
"M.",
""
]
] | In this work, we have studied the quasinormal modes of a black hole in a model of the type $f(Q)=\underset{n}{\sum}a_{n}\left(Q-Q_{0}\right)^{n} $ in $f(Q)$ gravity by using a recently introduced method known as Bernstein spectral method and confirmed the validity of the method with the help of well known Pad\'e averag... |
1605.01273 | Thomas M\"adler | Thomas M\"adler and Jeffrey Winicour | The sky pattern of the linearized gravitational memory effect | typos corrected, matches published version | Class. Quantum Grav. 33 (2016) 175006 | 10.1088/0264-9381/33/17/175006 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational memory effect leads to a net displacement in the relative
positions of test particles. This memory is related to the change in the strain
of the gravitational radiation field between infinite past and infinite future
retarded times. There are three known sources of the memory effect: (i) the
loss of... | [
{
"created": "Wed, 4 May 2016 13:30:57 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Aug 2016 14:40:54 GMT",
"version": "v2"
}
] | 2016-08-03 | [
[
"Mädler",
"Thomas",
""
],
[
"Winicour",
"Jeffrey",
""
]
] | The gravitational memory effect leads to a net displacement in the relative positions of test particles. This memory is related to the change in the strain of the gravitational radiation field between infinite past and infinite future retarded times. There are three known sources of the memory effect: (i) the loss of e... |
1005.5330 | Laszlo Arpad Gergely | L\'aszl\'o \'Arp\'ad Gergely | Spinning compact binary inspiral II: Conservative angular dynamics | v2: 19 pages, extended, improved, published version | Phys.Rev.D82:104031,2010 | 10.1103/PhysRevD.82.104031 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish the evolution equations of the set of independent variables
characterizing the 2PN rigorous conservative dynamics of a spinning compact
binary, with the inclusion of the leading order spin-orbit, spin-spin and mass
quadrupole - mass monopole effects, for generic (noncircular, nonspherical)
orbits. More s... | [
{
"created": "Fri, 28 May 2010 16:57:09 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Nov 2010 17:05:22 GMT",
"version": "v2"
}
] | 2010-12-09 | [
[
"Gergely",
"László Árpád",
""
]
] | We establish the evolution equations of the set of independent variables characterizing the 2PN rigorous conservative dynamics of a spinning compact binary, with the inclusion of the leading order spin-orbit, spin-spin and mass quadrupole - mass monopole effects, for generic (noncircular, nonspherical) orbits. More spe... |
2205.01682 | Jian-Hua He | Yi Qiu, Ke Wang, Jian-hua He | Amplitude modulation in binary gravitational lensing of gravitational
waves | 6 pages, 5 figures | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the detectability of gravitational waves (GWs) lensed by a
system that consists of binary black holes as lenses using time-domain
numerical simulations. The gravitational lensing potential of this system is no
longer static but evolves with time. When GWs from the source pass through the
binary lens, t... | [
{
"created": "Tue, 3 May 2022 14:48:18 GMT",
"version": "v1"
}
] | 2022-05-05 | [
[
"Qiu",
"Yi",
""
],
[
"Wang",
"Ke",
""
],
[
"He",
"Jian-hua",
""
]
] | We investigate the detectability of gravitational waves (GWs) lensed by a system that consists of binary black holes as lenses using time-domain numerical simulations. The gravitational lensing potential of this system is no longer static but evolves with time. When GWs from the source pass through the binary lens, the... |
2303.10884 | Mouhssine Koussour | Tee-How Loo, M. Koussour and Avik De | Anisotropic Universe in $f(Q,T)$ gravity, a novel study | AOP accepted version | null | 10.1016/j.aop.2023.169333 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $f(Q,T)$ theory of gravity is very recently proposed to incorporate within
the action Lagrangian, the trace $T$ of the energy-momentum tensor along with
the non-metricity scalar $Q$. The cosmological application of this theory in a
spatially flat isotropic and homogeneous Universe is well-studied. However, our
Univer... | [
{
"created": "Mon, 20 Mar 2023 06:03:13 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2023 05:29:37 GMT",
"version": "v2"
}
] | 2023-05-24 | [
[
"Loo",
"Tee-How",
""
],
[
"Koussour",
"M.",
""
],
[
"De",
"Avik",
""
]
] | $f(Q,T)$ theory of gravity is very recently proposed to incorporate within the action Lagrangian, the trace $T$ of the energy-momentum tensor along with the non-metricity scalar $Q$. The cosmological application of this theory in a spatially flat isotropic and homogeneous Universe is well-studied. However, our Universe... |
2107.04830 | Aldo Gamboa | Aldo Gamboa, Carlos Gabarrete, Paola Dom\'inguez-Fern\'andez, Dar\'io
N\'u\~nez, Olivier Sarbach | Accretion of a Vlasov gas on to a black hole from a sphere of finite
radius and the role of angular momentum | 21 pages, 3 figures. Improved version, to appear in Physical Review D | Phys. Rev. D 104, 083001 (2021) | 10.1103/PhysRevD.104.083001 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The accretion of a spherically symmetric, collisionless kinetic gas cloud on
to a Schwarzschild black hole is analysed. Whereas previous studies have
treated this problem by specifying boundary conditions at infinity, here the
properties of the gas are given at a sphere of finite radius. The corresponding
steady-stat... | [
{
"created": "Sat, 10 Jul 2021 12:59:12 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Sep 2021 19:10:44 GMT",
"version": "v2"
}
] | 2021-10-04 | [
[
"Gamboa",
"Aldo",
""
],
[
"Gabarrete",
"Carlos",
""
],
[
"Domínguez-Fernández",
"Paola",
""
],
[
"Núñez",
"Darío",
""
],
[
"Sarbach",
"Olivier",
""
]
] | The accretion of a spherically symmetric, collisionless kinetic gas cloud on to a Schwarzschild black hole is analysed. Whereas previous studies have treated this problem by specifying boundary conditions at infinity, here the properties of the gas are given at a sphere of finite radius. The corresponding steady-state ... |
gr-qc/0507014 | Frans Pretorius | Frans Pretorius | Evolution of Binary Black Hole Spacetimes | 4 pages, 3 figures | Phys.Rev.Lett.95:121101,2005 | 10.1103/PhysRevLett.95.121101 | null | gr-qc astro-ph hep-th | null | We describe early success in the evolution of binary black hole spacetimes
with a numerical code based on a generalization of harmonic coordinates.
Indications are that with sufficient resolution this scheme is capable of
evolving binary systems for enough time to extract information about the orbit,
merger and gravi... | [
{
"created": "Mon, 4 Jul 2005 09:12:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pretorius",
"Frans",
""
]
] | We describe early success in the evolution of binary black hole spacetimes with a numerical code based on a generalization of harmonic coordinates. Indications are that with sufficient resolution this scheme is capable of evolving binary systems for enough time to extract information about the orbit, merger and gravita... |
1505.01291 | Alfred Molina | Xavier Ja\'en and Alfred Molina | On the meaning of Painlev\'e--Gullstrand synchronization | null | null | 10.1007/s10714-015-1994-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Following on from two recent papers, here we examine the relationship between
Newtonian gravitation and general relativity in more depth. This allows us to
define a scalar potential which is just the proper time of the vector potential
when the latter is interpreted as the geodesic velocity field. The results are
clo... | [
{
"created": "Wed, 6 May 2015 09:28:47 GMT",
"version": "v1"
}
] | 2015-12-09 | [
[
"Jaén",
"Xavier",
""
],
[
"Molina",
"Alfred",
""
]
] | Following on from two recent papers, here we examine the relationship between Newtonian gravitation and general relativity in more depth. This allows us to define a scalar potential which is just the proper time of the vector potential when the latter is interpreted as the geodesic velocity field. The results are close... |
2111.03113 | Ra\'ul Carballo-Rubio | Ra\'ul Carballo-Rubio, Francesco Di Filippo, Stefano Liberati and Matt
Visser | Geodesically complete black holes in Lorentz-violating gravity | 28 pages, 8 figures | null | 10.1007/JHEP02(2022)122 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a systematic study of the geometric structure of non-singular
spacetimes describing black holes in Lorentz-violating gravity. We start with a
review of the definition of trapping horizons, and the associated notions of
trapped and marginally trapped surfaces, and then study their significance in
frameworks... | [
{
"created": "Thu, 4 Nov 2021 19:23:14 GMT",
"version": "v1"
}
] | 2022-03-09 | [
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Di Filippo",
"Francesco",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Visser",
"Matt",
""
]
] | We present a systematic study of the geometric structure of non-singular spacetimes describing black holes in Lorentz-violating gravity. We start with a review of the definition of trapping horizons, and the associated notions of trapped and marginally trapped surfaces, and then study their significance in frameworks w... |
0710.5493 | Jose M. M. Senovilla | Jos\'e M. M. Senovilla | Report on workshop A1: Exact solutions and their interpretation | 9 pages, no figures. Many typos corrected. Report submitted to the
Proceedings of GR18. To appear in CQG | null | 10.1088/0264-9381/25/11/114014 | null | gr-qc | null | I report on the communications and posters presented on exact solutions and
their interpretation at the GRG18 Conference, Sydney.
| [
{
"created": "Mon, 29 Oct 2007 17:53:00 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Nov 2007 17:44:37 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Senovilla",
"José M. M.",
""
]
] | I report on the communications and posters presented on exact solutions and their interpretation at the GRG18 Conference, Sydney. |
1103.4967 | Claus Kiefer | Claus Kiefer and Manuel Kraemer | Quantum Gravitational Contributions to the CMB Anisotropy Spectrum | 4 pages, v3: sign error in Eq. (5) and its consequences corrected | Phys. Rev. Lett. 108, 021301 (2012) | 10.1103/PhysRevLett.108.021301 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the primordial power spectrum of density fluctuations in the
framework of quantum cosmology. For this purpose we perform a Born-Oppenheimer
approximation to the Wheeler-DeWitt equation for an inflationary universe with
a scalar field. In this way we first recover the scale-invariant power spectrum
that is f... | [
{
"created": "Fri, 25 Mar 2011 13:48:13 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2011 08:14:34 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Oct 2011 07:30:23 GMT",
"version": "v3"
}
] | 2012-01-17 | [
[
"Kiefer",
"Claus",
""
],
[
"Kraemer",
"Manuel",
""
]
] | We derive the primordial power spectrum of density fluctuations in the framework of quantum cosmology. For this purpose we perform a Born-Oppenheimer approximation to the Wheeler-DeWitt equation for an inflationary universe with a scalar field. In this way we first recover the scale-invariant power spectrum that is fou... |
gr-qc/0406083 | Francisco Lobo | Francisco S. N. Lobo and Matt Visser | Fundamental limitations on "warp drive" spacetimes | 18 pages, Revtex4. V2: one reference added, some clarifying comments
and discussion, no physics changes, accepted for publication in Classical and
Quantum Gravity | Class.Quant.Grav. 21 (2004) 5871-5892 | 10.1088/0264-9381/21/24/011 | null | gr-qc astro-ph hep-th | null | "Warp drive" spacetimes are useful as "gedanken-experiments" that force us to
confront the foundations of general relativity, and among other things, to
precisely formulate the notion of "superluminal" communication. We verify the
non-perturbative violation of the classical energy conditions of the Alcubierre
and Nat... | [
{
"created": "Mon, 21 Jun 2004 11:07:42 GMT",
"version": "v1"
},
{
"created": "Sun, 31 Oct 2004 13:32:19 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Lobo",
"Francisco S. N.",
""
],
[
"Visser",
"Matt",
""
]
] | "Warp drive" spacetimes are useful as "gedanken-experiments" that force us to confront the foundations of general relativity, and among other things, to precisely formulate the notion of "superluminal" communication. We verify the non-perturbative violation of the classical energy conditions of the Alcubierre and Natar... |
gr-qc/0607058 | Barry Holstein | Barry R. Holstein | Factorization in Graviton Scattering and the "Natural" Value of the
g-factor | 21 pages, 2 figures | null | 10.1103/PhysRevD.74.085002 | null | gr-qc hep-ph hep-th | null | The factorization property of graviton scattering amplitudes is reviewed and
show to be valid only if the "natural" value of the gyromagnetic ratio $g_S=2$
is employed -- independent of spin.
| [
{
"created": "Fri, 14 Jul 2006 15:05:46 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jul 2006 14:33:18 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Holstein",
"Barry R.",
""
]
] | The factorization property of graviton scattering amplitudes is reviewed and show to be valid only if the "natural" value of the gyromagnetic ratio $g_S=2$ is employed -- independent of spin. |
2311.02065 | Guillem Dom\`enech | Guillem Dom\`enech | Cosmological Gravitational Waves from Isocurvature Fluctuations | Invited review for the AAPPS bulletin | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves induced by large primordial curvature fluctuations may
result in a sizable stochastic gravitational wave background. Interestingly,
curvature fluctuations are gradually generated by initial isocurvature
fluctuations, which in turn induce gravitational waves. Initial isocurvature
fluctuations commo... | [
{
"created": "Fri, 3 Nov 2023 17:48:07 GMT",
"version": "v1"
}
] | 2023-11-06 | [
[
"Domènech",
"Guillem",
""
]
] | Gravitational waves induced by large primordial curvature fluctuations may result in a sizable stochastic gravitational wave background. Interestingly, curvature fluctuations are gradually generated by initial isocurvature fluctuations, which in turn induce gravitational waves. Initial isocurvature fluctuations commonl... |
1204.4744 | Leonid Marochnik | Leonid Marochnik | Dark energy from instantons | 11 two-column pages, 1 figure, V2 is updated pre-publication version.
The title is changed. Section 4 (Birth of Dark Energy) is extended. Misprints
are fixed | Grav. Cosmol. vol.19, No. 3, pp. 178-187, 2013 | 10.1134/S0202289313030067 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that in imaginary time quantum metric fluctuations of empty space
form a self-consistent de Sitter gravitational instanton that can be thought of
as describing tunneling from "nothing" into de Sitter space of real time (no
cosmological constant or scalar fields are needed). For the first time, this
mechanism ... | [
{
"created": "Thu, 19 Apr 2012 18:59:30 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Jun 2013 17:06:13 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Marochnik",
"Leonid",
""
]
] | We show that in imaginary time quantum metric fluctuations of empty space form a self-consistent de Sitter gravitational instanton that can be thought of as describing tunneling from "nothing" into de Sitter space of real time (no cosmological constant or scalar fields are needed). For the first time, this mechanism is... |
2011.07700 | Brett McInnes | Brett McInnes | About Magnetic AdS Black Holes | 21 pages, 7 figures; typos fixed, references added | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There has recently been a strong revival of interest in quasi-extremal
magnetically charged black holes. In the asymptotically flat case, it is
possible to choose the magnetic charge of such an object in such a manner that
the black hole is surrounded by a corona in which electroweak symmetry is
restored on macroscop... | [
{
"created": "Mon, 16 Nov 2020 02:57:12 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Nov 2020 03:37:33 GMT",
"version": "v2"
}
] | 2020-12-09 | [
[
"McInnes",
"Brett",
""
]
] | There has recently been a strong revival of interest in quasi-extremal magnetically charged black holes. In the asymptotically flat case, it is possible to choose the magnetic charge of such an object in such a manner that the black hole is surrounded by a corona in which electroweak symmetry is restored on macroscopic... |
gr-qc/9408038 | Dadhich | Naresh Dadhich, L.K. Patel, K.S. Govinder and P.G.L. Leach | Characterisation of orthogonal perfect fluid cosmological spacetimes | TeX pages 18, IUCAA-27/94 | null | null | null | gr-qc | null | We consider the general orthogonal metric separable in space and time
variables in comoving coordinates. We then characterise perfect fluid models
admitted by such a metric. It turns out that the homogeneous models can only be
either FLRW or Bianchi I while the inhomogeneous ones can only admit $G_2 $
(two mutually a... | [
{
"created": "Wed, 31 Aug 1994 13:56:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dadhich",
"Naresh",
""
],
[
"Patel",
"L. K.",
""
],
[
"Govinder",
"K. S.",
""
],
[
"Leach",
"P. G. L.",
""
]
] | We consider the general orthogonal metric separable in space and time variables in comoving coordinates. We then characterise perfect fluid models admitted by such a metric. It turns out that the homogeneous models can only be either FLRW or Bianchi I while the inhomogeneous ones can only admit $G_2 $ (two mutually as ... |
gr-qc/9307017 | Ulvi Yurtsever | Ulvi Yurtsever | Algebraic approach to quantum field theory on non-globally-hyperbolic
spacetimes | 21 pages, UCSBTH-92-43 | Class.Quant.Grav.11:999-1012,1994 | 10.1088/0264-9381/11/4/016 | null | gr-qc | null | The mathematical formalism for linear quantum field theory on curved
spacetime depends in an essential way on the assumption of global
hyperbolicity. Physically, what lie at the foundation of any formalism for
quantization in curved spacetime are the canonical commutation relations,
imposed on the field operators eva... | [
{
"created": "Wed, 14 Jul 1993 03:11:38 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Yurtsever",
"Ulvi",
""
]
] | The mathematical formalism for linear quantum field theory on curved spacetime depends in an essential way on the assumption of global hyperbolicity. Physically, what lie at the foundation of any formalism for quantization in curved spacetime are the canonical commutation relations, imposed on the field operators evalu... |
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