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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/9709032 | Eric Poisson | Eric Poisson | Gravitational waves from inspiraling compact binaries: The
quadrupole-moment term | 5 pages, ReVTeX | Phys. Rev. D 57, 5287 (1998) | 10.1103/PhysRevD.57.5287 | null | gr-qc | null | A rotating star's oblateness creates a deformation in the gravitational field
outside the star, which is measured by the quadrupole-moment tensor. We
consider the effect of the quadrupole moment on the orbital motion and rate of
inspiral of a compact binary system, composed of neutron stars and/or black
holes. We fin... | [
{
"created": "Fri, 12 Sep 1997 20:33:28 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Poisson",
"Eric",
""
]
] | A rotating star's oblateness creates a deformation in the gravitational field outside the star, which is measured by the quadrupole-moment tensor. We consider the effect of the quadrupole moment on the orbital motion and rate of inspiral of a compact binary system, composed of neutron stars and/or black holes. We find ... |
1906.11838 | Shoichiro Miyashita | Shoichiro Miyashita | Energy spectrum of a quantum spacetime with boundary | 19 pages, 4 figures, 1 table ; v2 : typos corrected | Class. Quant. Grav. 36 (2019) 155003 | 10.1088/1361-6382/ab2e22 | WU-AP/1904/19 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, I revisit the microcanonical partition function, or density of
states (DOS), of general relativity. By using the minisuperspace path integral
approximation, I directly calculate the $S^2 \times Disc$ topology sector of
the DOS of a (quantum) spacetime with an $S^2\times \mathbb{R}$ Lorentzian
boundary ... | [
{
"created": "Thu, 27 Jun 2019 18:00:00 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Jul 2019 18:00:36 GMT",
"version": "v2"
}
] | 2019-07-30 | [
[
"Miyashita",
"Shoichiro",
""
]
] | In this paper, I revisit the microcanonical partition function, or density of states (DOS), of general relativity. By using the minisuperspace path integral approximation, I directly calculate the $S^2 \times Disc$ topology sector of the DOS of a (quantum) spacetime with an $S^2\times \mathbb{R}$ Lorentzian boundary fr... |
gr-qc/9306019 | null | V\'ictor M. Villalba | Dirac equation in some homogeneous$sqace-times, separation of variables
and exact solutions | 19p, Latex, IVIC-CFLE-93/1 | Mod.Phys.Lett. A8 (1993) 2351-2364 | 10.1142/S0217732393003652 | null | gr-qc | null | In the present article, using a further generalization of the algebraic
method of separation of variables, the Dirac equation is separated in a family
of space-times where it is not possible to find a complete set of first order
commuting differential operators. After separating variables, the Dirac
equation is reduc... | [
{
"created": "Wed, 16 Jun 1993 04:54:33 GMT",
"version": "v1"
}
] | 2016-08-14 | [
[
"Villalba",
"Víctor M.",
""
]
] | In the present article, using a further generalization of the algebraic method of separation of variables, the Dirac equation is separated in a family of space-times where it is not possible to find a complete set of first order commuting differential operators. After separating variables, the Dirac equation is reduced... |
gr-qc/0512035 | Rong-Gen Cai | Jianyong Shen, Rong-Gen Cai, Bin Wang, Ru-Keng Su | Thermodynamic Geometry and Critical Behavior of Black Holes | Revtex, 18 pages including 4 figures | Int.J.Mod.Phys.A22:11-27,2007 | 10.1142/S0217751X07034064 | null | gr-qc hep-th | null | Based on the observations that there exists an analogy between the
Reissner-Nordstr\"om-anti-de Sitter (RN-AdS) black holes and the van der
Waals-Maxwell liquid-gas system, in which a correspondence of variables is
$(\phi, q) \leftrightarrow (V,P)$, we study the Ruppeiner geometry, defined as
Hessian matrix of black ... | [
{
"created": "Tue, 6 Dec 2005 03:55:12 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Shen",
"Jianyong",
""
],
[
"Cai",
"Rong-Gen",
""
],
[
"Wang",
"Bin",
""
],
[
"Su",
"Ru-Keng",
""
]
] | Based on the observations that there exists an analogy between the Reissner-Nordstr\"om-anti-de Sitter (RN-AdS) black holes and the van der Waals-Maxwell liquid-gas system, in which a correspondence of variables is $(\phi, q) \leftrightarrow (V,P)$, we study the Ruppeiner geometry, defined as Hessian matrix of black ho... |
1405.3900 | Franco Albareti | F. D. Albareti, J. A. R. Cembranos and A. L. Maroto | The large-scale structure of vacuum | 9 pages, 2 figures. Essay selected for "Honorable Mention" in the
Gravity Research Foundation 2014 Awards. Version published in IJMPD | Int. J. Mod. Phys. D (2014) 1442019 | 10.1142/S021827181442019X | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The vacuum state in quantum field theory is known to exhibit an important
number of fundamental physical features. In this work we explore the
possibility that this state could also present a non-trivial space-time
structure on large scales. In particular, we will show that by imposing the
renormalized vacuum energy-... | [
{
"created": "Thu, 15 May 2014 16:21:48 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Nov 2014 21:20:06 GMT",
"version": "v2"
}
] | 2014-11-07 | [
[
"Albareti",
"F. D.",
""
],
[
"Cembranos",
"J. A. R.",
""
],
[
"Maroto",
"A. L.",
""
]
] | The vacuum state in quantum field theory is known to exhibit an important number of fundamental physical features. In this work we explore the possibility that this state could also present a non-trivial space-time structure on large scales. In particular, we will show that by imposing the renormalized vacuum energy-mo... |
2104.05357 | Virginia D'Emilio | Virginia D'Emilio, Rhys Green, Vivien Raymond | Density estimation with Gaussian processes for gravitational-wave
posteriors | null | null | 10.1093/mnras/stab2623 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The properties of black-hole and neutron-star binaries are extracted from
gravitational-wave signals using Bayesian inference. This involves evaluating a
multi-dimensional posterior probability function with stochastic sampling. The
marginal probability density distributions from which the samples are drawn are
usual... | [
{
"created": "Mon, 12 Apr 2021 11:20:07 GMT",
"version": "v1"
}
] | 2021-09-29 | [
[
"D'Emilio",
"Virginia",
""
],
[
"Green",
"Rhys",
""
],
[
"Raymond",
"Vivien",
""
]
] | The properties of black-hole and neutron-star binaries are extracted from gravitational-wave signals using Bayesian inference. This involves evaluating a multi-dimensional posterior probability function with stochastic sampling. The marginal probability density distributions from which the samples are drawn are usually... |
1911.05385 | Indrani Banerjee | Indrani Banerjee, Subhadip Sau, Soumitra SenGupta | Implications of axionic hair on shadow of M87* | 20 pages, 6 figures | Phys. Rev. D. 101, 104057 (2020) | 10.1103/PhysRevD.101.104057 | null | gr-qc astro-ph.GA astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Detection of axion field can unfold intriguing facets of our universe in
several astrophysical and cosmological scenarios. In four dimensions, such a
field owes its origin to the completely anti-symmetric Kalb-Ramond field
strength tensor. Its invisibility in the solar system based tests compels one
to look for its s... | [
{
"created": "Wed, 13 Nov 2019 10:25:31 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jun 2020 13:52:27 GMT",
"version": "v2"
}
] | 2020-06-11 | [
[
"Banerjee",
"Indrani",
""
],
[
"Sau",
"Subhadip",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | Detection of axion field can unfold intriguing facets of our universe in several astrophysical and cosmological scenarios. In four dimensions, such a field owes its origin to the completely anti-symmetric Kalb-Ramond field strength tensor. Its invisibility in the solar system based tests compels one to look for its sig... |
1206.1559 | Erhard Scholz | Erhard Scholz | Paving the way for transitions --- a case for Weyl geometry | 54 pp, 2 figs. To appear in D. Lehmkuhl (ed.) "Towards a Theory of
Spacetime Theories", Einstein Studies, Basel: Birkhaeuser), revised version
June 2015 | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper presents three aspects by which the Weyl geometric generalization
of Riemannian geometry, and of Einstein gravity, sheds light on actual
questions of physics and its philosophical reflection. After introducing the
theory's principles, it explains how Weyl geometric gravity relates to
Jordan-Brans-Dicke the... | [
{
"created": "Thu, 7 Jun 2012 17:39:12 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Aug 2012 11:11:18 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Jul 2013 07:16:47 GMT",
"version": "v3"
},
{
"created": "Tue, 15 Apr 2014 14:04:50 GMT",
"version": "v4"
},
{
"cr... | 2015-07-28 | [
[
"Scholz",
"Erhard",
""
]
] | This paper presents three aspects by which the Weyl geometric generalization of Riemannian geometry, and of Einstein gravity, sheds light on actual questions of physics and its philosophical reflection. After introducing the theory's principles, it explains how Weyl geometric gravity relates to Jordan-Brans-Dicke theor... |
2111.11907 | J. A. R. Cembranos | Jose A. R. Cembranos | The Vacuum Frame | 5 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the most fundamental questions in cosmology is if dark energy is
related just to a constant or it is something more complex. In this work, we
call the attention to the fact that, under very general conditions, dark energy
can be identified with a cosmological constant. Indeed, this fact defines what
we call Va... | [
{
"created": "Tue, 23 Nov 2021 14:30:20 GMT",
"version": "v1"
}
] | 2021-11-24 | [
[
"Cembranos",
"Jose A. R.",
""
]
] | One of the most fundamental questions in cosmology is if dark energy is related just to a constant or it is something more complex. In this work, we call the attention to the fact that, under very general conditions, dark energy can be identified with a cosmological constant. Indeed, this fact defines what we call Vacu... |
2003.03752 | Richard Woodard | S. P. Miao (NCKU), L. Tan (Florida) and R. P. Woodard (Florida) | Bose-Fermi Cancellation of Cosmological Coleman-Weinberg Potentials | 14 pages, 5 figures, uses LaTeX 2e. Version 2 revised for publication | Class. Quant. Grav. 37 (2020) 165007 | 10.1088/1361-6382/ab9881 | UFIFT-QG-20-01 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological Coleman-Weinberg potentials are induced when normal matter is
coupled to the inflaton. It has long been known that the corrections from
bosonic fields are positive whereas those from fermionic fields are negative.
In flat space both take the form $\pm \varphi^4 \ln(\varphi)$, and they can be
made to canc... | [
{
"created": "Sun, 8 Mar 2020 09:36:24 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jul 2020 17:07:16 GMT",
"version": "v2"
}
] | 2020-08-03 | [
[
"Miao",
"S. P.",
"",
"NCKU"
],
[
"Tan",
"L.",
"",
"Florida"
],
[
"Woodard",
"R. P.",
"",
"Florida"
]
] | Cosmological Coleman-Weinberg potentials are induced when normal matter is coupled to the inflaton. It has long been known that the corrections from bosonic fields are positive whereas those from fermionic fields are negative. In flat space both take the form $\pm \varphi^4 \ln(\varphi)$, and they can be made to cancel... |
0710.2528 | Bayram Tekin | Bayram Tekin | Chern-Simons Modified General Relativity: Conserved charges | 9 pages, References added, version to appear in Phys. Rev. D | Phys.Rev.D77:024005,2008 | 10.1103/PhysRevD.77.024005 | null | gr-qc astro-ph hep-th | null | We construct the conserved charges (mass and angular momentum) of the
Chern-Simons modified General Relativity in asymptotically flat and Anti-de
Sitter (AdS) spacetimes. Our definition is based on background Killing
symmetries and reduces to the known expressions in the proper limits.
| [
{
"created": "Fri, 12 Oct 2007 18:46:07 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Nov 2007 04:30:24 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Tekin",
"Bayram",
""
]
] | We construct the conserved charges (mass and angular momentum) of the Chern-Simons modified General Relativity in asymptotically flat and Anti-de Sitter (AdS) spacetimes. Our definition is based on background Killing symmetries and reduces to the known expressions in the proper limits. |
gr-qc/0211085 | Matej Pavsic | Matej Pavsic | Clifford Space as the Arena for Physics | 30 pages, 4 figures; Talk presented at 3rd Biennial Conference of the
International Association for Relativistic Dynamics (IARD), Washington DC,
26-26 June 2002 | Found.Phys.33:1277-1306,2003 | 10.1023/A:1025637126758 | null | gr-qc hep-th | null | A new theory is considered according to which extended objects in
$n$-dimensional space are described in terms of multivector coordinates which
are interpreted as generalizing the concept of centre of mass coordinates.
While the usual centre of mass is a point, by generalizing the latter concept,
we associate with ev... | [
{
"created": "Tue, 26 Nov 2002 16:56:31 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Mar 2003 12:35:10 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Pavsic",
"Matej",
""
]
] | A new theory is considered according to which extended objects in $n$-dimensional space are described in terms of multivector coordinates which are interpreted as generalizing the concept of centre of mass coordinates. While the usual centre of mass is a point, by generalizing the latter concept, we associate with ever... |
1112.1898 | Vuk Mandic | Chengjian Wu, Vuk Mandic, and Tania Regimbau | Accessibility of the Gravitational-Wave Background due to Binary
Coalescences to Second and Third Generation Gravitational-Wave Detectors | 8 pages, 5 figures | null | 10.1103/PhysRevD.85.104024 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Compact binary coalescences, such as binary neutron stars or black holes, are
among the most promising candidate sources for the current and future
terrestrial gravitational-wave detectors. While such sources are best searched
using matched template techniques and chirp template banks, integrating chirp
signals from ... | [
{
"created": "Thu, 8 Dec 2011 17:56:25 GMT",
"version": "v1"
}
] | 2013-03-06 | [
[
"Wu",
"Chengjian",
""
],
[
"Mandic",
"Vuk",
""
],
[
"Regimbau",
"Tania",
""
]
] | Compact binary coalescences, such as binary neutron stars or black holes, are among the most promising candidate sources for the current and future terrestrial gravitational-wave detectors. While such sources are best searched using matched template techniques and chirp template banks, integrating chirp signals from bi... |
1703.04966 | Jiro Matsumoto | Jiro Matsumoto and Sergey V. Sushkov | General dynamical properties of cosmological models with nonminimal
kinetic coupling | 31 pages, 5 figures, 3 tables. New section "Slow-roll regime" added,
references added, sentences polished. Version accepted for publication in
JCAP | JCAP01(2018)040 | 10.1088/1475-7516/2018/01/040 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider cosmological dynamics in the theory of gravity with the scalar
field possessing the nonminimal kinetic coupling to curvature given as $\eta
G^{\mu\nu}\phi_{,\mu}\phi_{,\nu}$, where $\eta$ is an arbitrary coupling
parameter, and the scalar potential $V(\phi)$ which assumed to be as general as
possible. Wit... | [
{
"created": "Wed, 15 Mar 2017 06:46:24 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jan 2018 03:00:57 GMT",
"version": "v2"
}
] | 2018-01-24 | [
[
"Matsumoto",
"Jiro",
""
],
[
"Sushkov",
"Sergey V.",
""
]
] | We consider cosmological dynamics in the theory of gravity with the scalar field possessing the nonminimal kinetic coupling to curvature given as $\eta G^{\mu\nu}\phi_{,\mu}\phi_{,\nu}$, where $\eta$ is an arbitrary coupling parameter, and the scalar potential $V(\phi)$ which assumed to be as general as possible. With ... |
2407.02429 | Orlando Luongo | Jesus Anaya-Galeana, Orlando Luongo, Hernando Quevedo | A thermodynamic model of inflation without inflaton field | 15 pages, 6 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of geometrothermodynamics, we explore how to construct an
inflationary cosmic fluid without requiring inflaton fields. To do so, we
employ standard radiation and matter as barotropic background, speculating on
the existence of a further real fluid, interpreted as a possible matter with
pressure const... | [
{
"created": "Tue, 2 Jul 2024 17:01:14 GMT",
"version": "v1"
}
] | 2024-07-03 | [
[
"Anaya-Galeana",
"Jesus",
""
],
[
"Luongo",
"Orlando",
""
],
[
"Quevedo",
"Hernando",
""
]
] | In the framework of geometrothermodynamics, we explore how to construct an inflationary cosmic fluid without requiring inflaton fields. To do so, we employ standard radiation and matter as barotropic background, speculating on the existence of a further real fluid, interpreted as a possible matter with pressure constit... |
1711.08298 | Alfredo Urbano | Alexis D. Plascencia, Alfredo Urbano | Black hole superradiance and polarization-dependent bending of light | Bulk of 29 pages + 11 figures. v2: minor changes, version accepted
for publication in JCAP | null | 10.1088/1475-7516/2018/04/059 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An inhomogeneous pseudo-scalar field configuration behaves like an optically
active medium. Consequently, if a light ray passes through an axion cloud
surrounding a Kerr black hole, it may experience a polarization-dependent
bending. We explore the size and relevance of such effect considering both the
QCD axion and ... | [
{
"created": "Wed, 22 Nov 2017 14:41:09 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Apr 2018 13:49:49 GMT",
"version": "v2"
}
] | 2018-05-16 | [
[
"Plascencia",
"Alexis D.",
""
],
[
"Urbano",
"Alfredo",
""
]
] | An inhomogeneous pseudo-scalar field configuration behaves like an optically active medium. Consequently, if a light ray passes through an axion cloud surrounding a Kerr black hole, it may experience a polarization-dependent bending. We explore the size and relevance of such effect considering both the QCD axion and a ... |
gr-qc/0503065 | Golam Mortuza Hossain | Golam Mortuza Hossain | On Energy Conditions and Stability in Effective Loop Quantum Cosmology | 29 pages, revtex4; few clarifications, references added, to appear in
CQG | Class.Quant.Grav.22:2653-2670,2005 | 10.1088/0264-9381/22/13/009 | IMSc/2005/03/05 | gr-qc astro-ph hep-th | null | In isotropic loop quantum cosmology, non-perturbatively modified dynamics of
a minimally coupled scalar field violates weak, strong and dominant energy
conditions when they are stated in terms of equation of state parameter. The
violation of strong energy condition helps to have non-singular evolution by
evading sing... | [
{
"created": "Tue, 15 Mar 2005 17:40:02 GMT",
"version": "v1"
},
{
"created": "Fri, 13 May 2005 05:11:52 GMT",
"version": "v2"
}
] | 2010-11-05 | [
[
"Hossain",
"Golam Mortuza",
""
]
] | In isotropic loop quantum cosmology, non-perturbatively modified dynamics of a minimally coupled scalar field violates weak, strong and dominant energy conditions when they are stated in terms of equation of state parameter. The violation of strong energy condition helps to have non-singular evolution by evading singul... |
gr-qc/0504006 | Reinhard Prix | Reinhard Prix, Yousuke Itoh | Global parameter-space correlations of coherent searches for continuous
gravitational waves | 10 pages, 6 figures; contribution to GWDAW9, submitted to CQG | Class.Quant.Grav.22:S1003-S1012,2005 | 10.1088/0264-9381/22/18/S14 | AEI-2005-077 | gr-qc | null | The space of phase-parameters (sky-position, frequency, spindowns) of a
coherent matched-filtering search for continuous gravitational waves from
isolated neutron stars shows strong global correlations (``circles in the
sky''). In the local limit this can be analysed in terms of a parameter-space
metric, but the glob... | [
{
"created": "Fri, 1 Apr 2005 22:14:53 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Prix",
"Reinhard",
""
],
[
"Itoh",
"Yousuke",
""
]
] | The space of phase-parameters (sky-position, frequency, spindowns) of a coherent matched-filtering search for continuous gravitational waves from isolated neutron stars shows strong global correlations (``circles in the sky''). In the local limit this can be analysed in terms of a parameter-space metric, but the global... |
2110.12728 | Ryotaro Kase | Ryotaro Kase and Shinji Tsujikawa | Relativistic star perturbations in Horndeski theories with a gauge-ready
formulation | 29 pages | Phys. Rev. D 105, 024059 (2022) | 10.1103/PhysRevD.105.024059 | WUCG-21-13 | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general framework for studying the relativistic star
perturbations on a static and spherically symmetric background in full
Horndeski theories. We take a perfect fluid into account as a form of the
Schutz-Sorkin action. Our formulation is sufficiently versatile in that the
second-order actions of perturb... | [
{
"created": "Mon, 25 Oct 2021 08:35:48 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Dec 2021 14:17:53 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Jan 2022 12:44:46 GMT",
"version": "v3"
}
] | 2022-01-28 | [
[
"Kase",
"Ryotaro",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We present a general framework for studying the relativistic star perturbations on a static and spherically symmetric background in full Horndeski theories. We take a perfect fluid into account as a form of the Schutz-Sorkin action. Our formulation is sufficiently versatile in that the second-order actions of perturbat... |
1907.13582 | Jun Zhang | Jun Zhang, Huan Yang | Dynamic Signatures of Black Hole Binaries with Superradiant Clouds | 16 pages, 6 figures, discussion and references added | Phys. Rev. D 101, 043020 (2020) | 10.1103/PhysRevD.101.043020 | Imperial/TP/2019/JZ/02 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superradiant clouds may develop around a rotating black hole, if there is a
bosonic field with Compton wavelength comparable to the size of the black hole.
In this paper, we investigate the effects of the cloud on the orbits of nearby
compact objects. In particular, we consider the dynamical friction and the
backreac... | [
{
"created": "Wed, 31 Jul 2019 16:30:13 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Aug 2019 16:24:25 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Feb 2020 23:57:35 GMT",
"version": "v3"
}
] | 2020-03-04 | [
[
"Zhang",
"Jun",
""
],
[
"Yang",
"Huan",
""
]
] | Superradiant clouds may develop around a rotating black hole, if there is a bosonic field with Compton wavelength comparable to the size of the black hole. In this paper, we investigate the effects of the cloud on the orbits of nearby compact objects. In particular, we consider the dynamical friction and the backreacti... |
gr-qc/0405003 | Nathalie Deruelle | Nathalie Deruelle and Andreas Streich | Bouncing universes and their perturbations : a simple model revisited | null | Phys.Rev. D70 (2004) 103504 | 10.1103/PhysRevD.70.103504 | null | gr-qc astro-ph hep-th | null | We reconsider the toy model studied in [1] of a spatially closed
Friedmann-Lemaitre universe, driven by a massive scalar field, which deflates
quasi-exponentially, bounces and then enters a period of standard inflation. We
find that the equations for the matter density perturbations can be solved
analytically, at lea... | [
{
"created": "Sat, 1 May 2004 13:43:14 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Deruelle",
"Nathalie",
""
],
[
"Streich",
"Andreas",
""
]
] | We reconsider the toy model studied in [1] of a spatially closed Friedmann-Lemaitre universe, driven by a massive scalar field, which deflates quasi-exponentially, bounces and then enters a period of standard inflation. We find that the equations for the matter density perturbations can be solved analytically, at least... |
gr-qc/9810048 | Felix Finster | Felix Finster, Joel Smoller, and Shing-Tung Yau | Non-Existence of Black Hole Solutions for a Spherically Symmetric,
Static Einstein-Dirac-Maxwell System | 13 pages, LaTeX, typo in separation ansatz (3.1) and (3.2) corrected | Commun. Math. Phys. 205 (1999) 249-262 | 10.1007/s002200050675 | null | gr-qc math-ph math.MP | null | We consider for j=1/2, 3/2,... a spherically symmetric, static system of
(2j+1) Dirac particles, each having total angular momentum j. The Dirac
particles interact via a classical gravitational and electromagnetic field.
The Einstein-Dirac-Maxwell equations for this system are derived. It is shown
that, under weak ... | [
{
"created": "Wed, 14 Oct 1998 20:49:27 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Mar 1999 19:49:26 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Sep 1999 05:55:47 GMT",
"version": "v3"
},
{
"created": "Mon, 4 Feb 2008 08:57:00 GMT",
"version": "v4"
}
] | 2009-10-31 | [
[
"Finster",
"Felix",
""
],
[
"Smoller",
"Joel",
""
],
[
"Yau",
"Shing-Tung",
""
]
] | We consider for j=1/2, 3/2,... a spherically symmetric, static system of (2j+1) Dirac particles, each having total angular momentum j. The Dirac particles interact via a classical gravitational and electromagnetic field. The Einstein-Dirac-Maxwell equations for this system are derived. It is shown that, under weak regu... |
gr-qc/0011048 | Remo Garattini | Remo Garattini | Wormholes and Spacetime Foam: an approach to the Cosmological Constant
and Entropy | 6 pages, RevTex. To be submitted to the on-line proceedings of the
Ninth Marcel Grossmann Conference (Rome, 2-8 July 2000); abbreviated version
to be submitted to the printed proceedings | null | null | null | gr-qc hep-th | null | This paper summarizes the contribution presented at the IX Marcel Grossmann
Meeting (Rome, July 2000). A simple model of spacetime foam, made by $N$
Schwarzschild wormholes in a semiclassical approximation, is here proposed. The
Casimir-like energy of the quantum fluctuation of such a model and its
probability of bei... | [
{
"created": "Tue, 14 Nov 2000 10:44:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Garattini",
"Remo",
""
]
] | This paper summarizes the contribution presented at the IX Marcel Grossmann Meeting (Rome, July 2000). A simple model of spacetime foam, made by $N$ Schwarzschild wormholes in a semiclassical approximation, is here proposed. The Casimir-like energy of the quantum fluctuation of such a model and its probability of being... |
1808.05972 | Yurii Ignat'ev | Yurii Ignat'ev and A. R. Samigullina | Averaging of the Equations of the Standard Cosmological Model over Rapid
Oscillations: Influence of the cosmological term on the mean value of the
effective barotropic coefficient | 7 pages, 3 figures, 4 referencess | null | 10.1007/s11182-018-1443-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the help of an applied software package written by the authors, we have
averaged the effective total barotropic coefficient $\kappa=(-\lambda +
p)/(\lambda+\epsilon$) of the classical scalar field and the cosmological term
and have shown that during cosmological evolution for sufficiently large values
of the cos... | [
{
"created": "Fri, 17 Aug 2018 19:12:18 GMT",
"version": "v1"
}
] | 2018-09-26 | [
[
"Ignat'ev",
"Yurii",
""
],
[
"Samigullina",
"A. R.",
""
]
] | With the help of an applied software package written by the authors, we have averaged the effective total barotropic coefficient $\kappa=(-\lambda + p)/(\lambda+\epsilon$) of the classical scalar field and the cosmological term and have shown that during cosmological evolution for sufficiently large values of the cosmo... |
2301.10532 | Antonio Vassallo | Pooya Farokhi, Tim Koslowski, Pedro Naranjo, Antonio Vassallo | A de Broglie-Bohm Model of Pure Shape Dynamics: $N$-body system | 24 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide the construction of a de Broglie-Bohm model of the $N$-body system
within the framework of Pure Shape Dynamics. The equation of state of the curve
in shape space is worked out, with the instantaneous shape being guided by a
wave function. In order to get a better understanding of the dynamical system,
we a... | [
{
"created": "Wed, 25 Jan 2023 11:44:03 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Dec 2023 12:25:13 GMT",
"version": "v2"
}
] | 2023-12-12 | [
[
"Farokhi",
"Pooya",
""
],
[
"Koslowski",
"Tim",
""
],
[
"Naranjo",
"Pedro",
""
],
[
"Vassallo",
"Antonio",
""
]
] | We provide the construction of a de Broglie-Bohm model of the $N$-body system within the framework of Pure Shape Dynamics. The equation of state of the curve in shape space is worked out, with the instantaneous shape being guided by a wave function. In order to get a better understanding of the dynamical system, we als... |
1209.0773 | Paolo Pani | Paolo Pani, Vitor Cardoso, Leonardo Gualtieri, Emanuele Berti, Akihiro
Ishibashi | Perturbations of slowly rotating black holes: massive vector fields in
the Kerr metric | v1: 29 pages, 9 figures, 3 appendices. v2: References added and
improved discussion. Matches the version to appear in Physical Review D.
Mathematica notebooks available here http://blackholes.ist.utl.pt/?page=Files
and http://www.phy.olemiss.edu/~berti/qnms.html | null | 10.1103/PhysRevD.86.104017 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a general method to study linear perturbations of slowly rotating
black holes which is valid for any perturbation field, and particularly
advantageous when the field equations are not separable. As an illustration of
the method we investigate massive vector (Proca) perturbations in the Kerr
metric, which d... | [
{
"created": "Tue, 4 Sep 2012 20:00:05 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Oct 2012 05:43:03 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Pani",
"Paolo",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Ishibashi",
"Akihiro",
""
]
] | We discuss a general method to study linear perturbations of slowly rotating black holes which is valid for any perturbation field, and particularly advantageous when the field equations are not separable. As an illustration of the method we investigate massive vector (Proca) perturbations in the Kerr metric, which do ... |
gr-qc/0306097 | Mahmut Hortacsu | M.Hortacsu | Notes on Choptuik Phenomena | 20 pages, Plaintex, Talk given during the Research Semester on
Gravitation and Cosmology, Feza Gursey Institute, Istanbul, Turkey,JUne -July
2003 | null | null | null | gr-qc | null | We review the work going on in black-hole physics during the last ten years,
called the Choptuik Phenomenon.
| [
{
"created": "Sat, 21 Jun 2003 11:56:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hortacsu",
"M.",
""
]
] | We review the work going on in black-hole physics during the last ten years, called the Choptuik Phenomenon. |
1412.1028 | Suprit Singh | Suprit Singh | Excavations at the gravitationally collapsed site: Recent findings | 7 Pages, 3 Figures, Conference proceedings for the Spanish Relativity
Meeting (ERE 2014), Valencia, Spain, 1-5 Sept. 2014 | J. Phys.: Conf. Ser. 600 012035 (2015) | 10.1088/1742-6596/600/1/012035 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hawking effect was dug out of the gravitationally collapsed site forty years
back when it was realised that quantum effects at the horizon could propagate
outward to infinity giving rise to a thermal flux at late-times. However, the
situation regarding non-asymptotic observers was never completely clear. Also,
recent... | [
{
"created": "Tue, 2 Dec 2014 19:25:57 GMT",
"version": "v1"
}
] | 2016-05-09 | [
[
"Singh",
"Suprit",
""
]
] | Hawking effect was dug out of the gravitationally collapsed site forty years back when it was realised that quantum effects at the horizon could propagate outward to infinity giving rise to a thermal flux at late-times. However, the situation regarding non-asymptotic observers was never completely clear. Also, recently... |
2310.14378 | Alexandre Landry | Alan A. Coley and Alexandre Landry and Fateme Gholami | Teleparallel Robertson-Walker geometries and applications | 18 pages, no figure, Published in Universe MDPI | Universe, 2023, 9(10), 454 | 10.3390/universe9100454 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | In teleparallel geometries the coframe and corresponding spin-connection are
the principal geometric objects and consequently the appropriate definition of
a symmetry is that of an affine symmetry. The set of invariant coframes and
their corresponding spin connections that respect the full six dimensional Lie
algebra... | [
{
"created": "Sun, 22 Oct 2023 18:05:58 GMT",
"version": "v1"
}
] | 2023-10-24 | [
[
"Coley",
"Alan A.",
""
],
[
"Landry",
"Alexandre",
""
],
[
"Gholami",
"Fateme",
""
]
] | In teleparallel geometries the coframe and corresponding spin-connection are the principal geometric objects and consequently the appropriate definition of a symmetry is that of an affine symmetry. The set of invariant coframes and their corresponding spin connections that respect the full six dimensional Lie algebra o... |
1909.01212 | Naqing Xie | Xiaokai He, Leong-Fai Wong, and Naqing Xie | On limit behavior of quasi-local mass for ellipsoids at spatial infinity | null | Commun. Theor. Phys. 72(2020)015403 | 10.1088/1572-9494/ab544c | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the spatial limit of the quasi-local mass for certain ellipsoids
in an asymptotically flat static spherically symmetric spacetime. These
ellipsoids are not nearly round but they are of interest as an admissible
parametrized foliation defining the Arnowitt-Deser-Misner (ADM) mass. The
Hawking mass of this f... | [
{
"created": "Tue, 3 Sep 2019 14:29:36 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jan 2020 15:02:38 GMT",
"version": "v2"
}
] | 2020-01-09 | [
[
"He",
"Xiaokai",
""
],
[
"Wong",
"Leong-Fai",
""
],
[
"Xie",
"Naqing",
""
]
] | We discuss the spatial limit of the quasi-local mass for certain ellipsoids in an asymptotically flat static spherically symmetric spacetime. These ellipsoids are not nearly round but they are of interest as an admissible parametrized foliation defining the Arnowitt-Deser-Misner (ADM) mass. The Hawking mass of this fam... |
2208.02420 | Jiliang Jing | Jiliang Jing, Sheng Long, Weike Deng, Mengjie Wang, Jieci Wang | New self-consistent effective one-body theory for spinless binaries
based on the post-Minkowskian approximation | 17 pages | Sci. China, Phys. Mech. Astron. 65, 100411, (2022) | 10.1007/s11433-022-1951-1 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The effective one-body theories, introduced by Buonanno and Damour, are novel
approaches to constructing a gravitational waveform template. By taking a gauge
in which $\psi_{1}^{B}$ and $\psi_{3}^{B}$ vanish, we find a decoupled equation
with separable variables for $\psi^{B}_{4}$ for gravitational perturbation in
th... | [
{
"created": "Thu, 4 Aug 2022 03:04:41 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Aug 2022 06:52:59 GMT",
"version": "v2"
}
] | 2023-07-28 | [
[
"Jing",
"Jiliang",
""
],
[
"Long",
"Sheng",
""
],
[
"Deng",
"Weike",
""
],
[
"Wang",
"Mengjie",
""
],
[
"Wang",
"Jieci",
""
]
] | The effective one-body theories, introduced by Buonanno and Damour, are novel approaches to constructing a gravitational waveform template. By taking a gauge in which $\psi_{1}^{B}$ and $\psi_{3}^{B}$ vanish, we find a decoupled equation with separable variables for $\psi^{B}_{4}$ for gravitational perturbation in the ... |
0901.3861 | Hiroyuki Nakano | Hiroyuki Nakano, Manuela Campanelli, Carlos O. Lousto, Yosef Zlochower | Comparison of Post-Newtonian and Numerical Evolutions of Black-Hole
Binaries | 4 pages, 2 figures, prepared for the proceedings of the 18th workshop
on general relativity and gravitation, Hiroshima, Japan, Nov.17 - Nov.21,
2008 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we compare the waveforms from the post-Newtonian (PN) approach
with the numerical simulations of generic black-hole binaries which have mass
ratio $q\sim0.8$, arbitrarily oriented spins with magnitudes $S_1/m_1^2\sim0.6$
and $S_2/m_2^2\sim0.4$, and orbit 9 times from an initial orbital separation of
$r... | [
{
"created": "Sat, 24 Jan 2009 22:33:24 GMT",
"version": "v1"
}
] | 2009-01-27 | [
[
"Nakano",
"Hiroyuki",
""
],
[
"Campanelli",
"Manuela",
""
],
[
"Lousto",
"Carlos O.",
""
],
[
"Zlochower",
"Yosef",
""
]
] | In this paper, we compare the waveforms from the post-Newtonian (PN) approach with the numerical simulations of generic black-hole binaries which have mass ratio $q\sim0.8$, arbitrarily oriented spins with magnitudes $S_1/m_1^2\sim0.6$ and $S_2/m_2^2\sim0.4$, and orbit 9 times from an initial orbital separation of $r\a... |
0809.1168 | Edward Anderson | Edward Anderson | Triangleland. I. Classical dynamics with exchange of relative angular
momentum | Journal Reference added, minor updates to References and Figures | Class.Quant.Grav.26:135020,2009 | 10.1088/0264-9381/26/13/135020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Euclidean relational particle mechanics, only relative times, relative
angles and relative separations are meaningful. Barbour--Bertotti (1982) theory
is of this form and can be viewed as a recovery of (a portion of) Newtonian
mechanics from relational premises. This is of interest in the absolute versus
relative ... | [
{
"created": "Sat, 6 Sep 2008 14:19:02 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Sep 2008 00:03:40 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Apr 2009 17:58:13 GMT",
"version": "v3"
},
{
"created": "Wed, 23 Sep 2009 23:57:12 GMT",
"version": "v4"
}
] | 2009-09-24 | [
[
"Anderson",
"Edward",
""
]
] | In Euclidean relational particle mechanics, only relative times, relative angles and relative separations are meaningful. Barbour--Bertotti (1982) theory is of this form and can be viewed as a recovery of (a portion of) Newtonian mechanics from relational premises. This is of interest in the absolute versus relative mo... |
0801.4606 | Seokcheon Lee | Seokcheon Lee | Palatini f(R) Cosmology | 10 pages, CosPA 2007 Proceeding will be published in the Mod. Phys.
Lett. A | Mod.Phys.Lett.A23:1388-1396,2008 | 10.1142/S021773230802776X | null | gr-qc astro-ph | null | We investigate the modified gravity theories in terms of the effective dark
energy models. We compare the cosmic expansion history and the linear growth in
different models. We also study the evolution of linear cosmological
perturbations in modified theories of gravity assuming the Palatini formalism.
We find the st... | [
{
"created": "Wed, 30 Jan 2008 05:48:27 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lee",
"Seokcheon",
""
]
] | We investigate the modified gravity theories in terms of the effective dark energy models. We compare the cosmic expansion history and the linear growth in different models. We also study the evolution of linear cosmological perturbations in modified theories of gravity assuming the Palatini formalism. We find the stab... |
1710.09845 | Anzhong Wang | M. Shahalam, Manabendra Sharma, Qiang Wu, and Anzhong Wang | Pre-inflationary dynamics in loop quantum cosmology: Power-law
potentials | revtex4, 11 figure and 4 tables. Some typos are corrected, and new
references are added. Phys. Rev. D96 (2017) 123533 | Phys. Rev. D 96, 123533 (2017) | 10.1103/PhysRevD.96.123533 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the pre-inflationary dynamics for the power-law
potential $(V(\phi) \propto \phi^n)$ with $n<2$ in the framework of loop
quantum cosmology. In the case where the kinetic energy of the inflaton
dominates at the initial, the evolution of the universe can always be divided
into three different ph... | [
{
"created": "Thu, 26 Oct 2017 18:00:24 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Nov 2017 20:15:05 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Dec 2017 14:33:39 GMT",
"version": "v3"
},
{
"created": "Wed, 27 Dec 2017 17:16:04 GMT",
"version": "v4"
}
] | 2018-01-03 | [
[
"Shahalam",
"M.",
""
],
[
"Sharma",
"Manabendra",
""
],
[
"Wu",
"Qiang",
""
],
[
"Wang",
"Anzhong",
""
]
] | In this paper, we study the pre-inflationary dynamics for the power-law potential $(V(\phi) \propto \phi^n)$ with $n<2$ in the framework of loop quantum cosmology. In the case where the kinetic energy of the inflaton dominates at the initial, the evolution of the universe can always be divided into three different phas... |
gr-qc/0312037 | Edward Anderson | Edward Anderson | Spacetime or Space and the Problem of Time | For Rio de Janeiro Marcel Grossmann Proceedings | null | null | null | gr-qc | null | GR and other theories have been obtained from 3-space rather than spacetime
principles. I explore consequences of this as regards the Problem of Time.
| [
{
"created": "Fri, 5 Dec 2003 21:01:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Anderson",
"Edward",
""
]
] | GR and other theories have been obtained from 3-space rather than spacetime principles. I explore consequences of this as regards the Problem of Time. |
2406.14552 | Chantal Pitte | Chantal Pitte and Quentin Baghi and Marc Besan\c{c}on and Antoine
Petiteau | Exploring the no-hair theorem with LISA | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this study, we explore the possibility of testing the no-hair theorem with
gravitational waves from massive black hole binaries in the frequency band of
the Laser Interferometer Space Antenna (LISA). Based on its sensitivity, we
consider LISA's ability to detect possible deviations from general relativity
(GR) in ... | [
{
"created": "Thu, 20 Jun 2024 17:58:31 GMT",
"version": "v1"
}
] | 2024-06-21 | [
[
"Pitte",
"Chantal",
""
],
[
"Baghi",
"Quentin",
""
],
[
"Besançon",
"Marc",
""
],
[
"Petiteau",
"Antoine",
""
]
] | In this study, we explore the possibility of testing the no-hair theorem with gravitational waves from massive black hole binaries in the frequency band of the Laser Interferometer Space Antenna (LISA). Based on its sensitivity, we consider LISA's ability to detect possible deviations from general relativity (GR) in th... |
1406.4531 | Joshua Cooperman | Joshua H. Cooperman | Renormalization of lattice-regularized quantum gravity models II. The
case of causal dynamical triangulations | 26 pages, 11 figures. The first paper in the two-part series will
appear shortly. The second paper is sufficiently self-contained to be read on
its own | General Relativity and Gravitation 48(3) (2016) 1-35 | 10.1007/s10714-016-2027-4 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The causal dynamical triangulations approach aims to construct a quantum
theory of gravity as the continuum limit of a lattice-regularized model of
dynamical geometry. A renormalization group scheme--in concert with finite size
scaling analysis--is essential to this aim. Formulating and implementing such a
scheme in ... | [
{
"created": "Tue, 17 Jun 2014 20:37:02 GMT",
"version": "v1"
}
] | 2016-03-09 | [
[
"Cooperman",
"Joshua H.",
""
]
] | The causal dynamical triangulations approach aims to construct a quantum theory of gravity as the continuum limit of a lattice-regularized model of dynamical geometry. A renormalization group scheme--in concert with finite size scaling analysis--is essential to this aim. Formulating and implementing such a scheme in th... |
gr-qc/0202021 | Dr. Corey B. Hart | F. Loup, R. Held, D. Waite, E. Halerewicz, Jr., M. Stabno, M.
Kuntzman, R. Sims | A causally connected superluminal Warp Drive spacetime | LaTeX2e, 9 pages, 3 eps figures | null | null | null | gr-qc | null | It will be shown that while horizons do not exist for warp drive spacetimes
traveling at subluminal velocities horizons begin to develop when a warp drive
spacetime reaches luminal velocities. However it will be shown that the control
region of a warp drive ship lie within the portion of the warped region that is
sti... | [
{
"created": "Wed, 6 Feb 2002 21:37:20 GMT",
"version": "v1"
}
] | 2012-08-27 | [
[
"Loup",
"F.",
""
],
[
"Held",
"R.",
""
],
[
"Waite",
"D.",
""
],
[
"Halerewicz,",
"E.",
"Jr."
],
[
"Stabno",
"M.",
""
],
[
"Kuntzman",
"M.",
""
],
[
"Sims",
"R.",
""
]
] | It will be shown that while horizons do not exist for warp drive spacetimes traveling at subluminal velocities horizons begin to develop when a warp drive spacetime reaches luminal velocities. However it will be shown that the control region of a warp drive ship lie within the portion of the warped region that is still... |
1106.4764 | Massimiliano Rinaldi | Massimiliano Rinaldi | The entropy of an acoustic black hole in Bose-Einstein condensates | Few more comments added. Version accepted for publication in Physical
Review D | Phys. Rev. D 84, 124009 (2011) | 10.1103/PhysRevD.84.124009 | null | gr-qc cond-mat.quant-gas hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the entanglement entropy associated to the Hawking emission of a
$(1+1)$-dimensional acoustic black hole in a Bose-Einstein condensate. We use
the brick wall model proposed by 't Hooft, adapted to the momentum space, in
order to tackle the case when high frequency dispersion is taken in account. As
expecte... | [
{
"created": "Thu, 23 Jun 2011 16:17:16 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Jul 2011 16:33:14 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Oct 2011 18:59:37 GMT",
"version": "v3"
},
{
"created": "Fri, 11 Nov 2011 08:10:00 GMT",
"version": "v4"
}
] | 2011-12-07 | [
[
"Rinaldi",
"Massimiliano",
""
]
] | We compute the entanglement entropy associated to the Hawking emission of a $(1+1)$-dimensional acoustic black hole in a Bose-Einstein condensate. We use the brick wall model proposed by 't Hooft, adapted to the momentum space, in order to tackle the case when high frequency dispersion is taken in account. As expected,... |
gr-qc/0609118 | Fabien Cavalier | F. Cavalier (LAL), M. Barsuglia (LAL), M.-A. Bizouard (LAL), V.
Brisson (LAL), A.-C. Clapson (LAL), M. Davier (LAL), P. Hello (LAL), S.
Kreckelbergh (LAL), N. Leroy (LAL), M. Varvella (LAL) | Reconstruction of source location in a network of gravitational wave
interferometric detectors | Accepted in Phys. Rev. D | Phys.Rev.D74:082004,2006 | 10.1103/PhysRevD.74.082004 | null | gr-qc | null | This paper deals with the reconstruction of the direction of a gravitational
wave source using the detection made by a network of interferometric detectors,
mainly the LIGO and Virgo detectors. We suppose that an event has been seen in
coincidence using a filter applied on the three detector data streams. Using
the a... | [
{
"created": "Tue, 26 Sep 2006 08:46:36 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Sep 2006 08:14:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Cavalier",
"F.",
"",
"LAL"
],
[
"Barsuglia",
"M.",
"",
"LAL"
],
[
"Bizouard",
"M. -A.",
"",
"LAL"
],
[
"Brisson",
"V.",
"",
"LAL"
],
[
"Clapson",
"A. -C.",
"",
"LAL"
],
[
"Davier",
"M.",
"",
"LAL"
... | This paper deals with the reconstruction of the direction of a gravitational wave source using the detection made by a network of interferometric detectors, mainly the LIGO and Virgo detectors. We suppose that an event has been seen in coincidence using a filter applied on the three detector data streams. Using the arr... |
1908.08712 | Emilio Elizalde | E. Elizalde, A. V. Timoshkin | Viscous fluid holographic inflation | 8 pages, no figures; typos corrected from previous version and
comments added; version to appear in European Physical Journal C | null | 10.1140/epjc/s10052-019-7244-z | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model of inflation produced by a viscous fluid is investigated and its
compatibility with the holographic principle at the very early universe (as
recently formulated for the holographic universe with a holographic cut-off
radius) is demonstrated. Specifically, ensuing from the model, the
corresponding scale factor... | [
{
"created": "Fri, 23 Aug 2019 08:17:59 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Aug 2019 12:55:21 GMT",
"version": "v2"
}
] | 2019-10-02 | [
[
"Elizalde",
"E.",
""
],
[
"Timoshkin",
"A. V.",
""
]
] | A model of inflation produced by a viscous fluid is investigated and its compatibility with the holographic principle at the very early universe (as recently formulated for the holographic universe with a holographic cut-off radius) is demonstrated. Specifically, ensuing from the model, the corresponding scale factor a... |
1812.11077 | Seong Chan Park | Ryusuke Jinno, Kunio Kaneta, Kin-ya Oda, Seong Chan Park | Hillclimbing inflation in metric and Palatini formulations | 8 pages, 9 figures | Phys. Lett. B791 (2019) 396-402 | 10.1016/j.physletb.2019.03.012 | CTPU-18-44, LDU2018-06, OU-HET-1002, UMN--TH--3913/19,
FTPI--MINN--19/04 | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new setup of cosmic inflation with a periodic inflaton potential and
conformal factor is discussed in the metric and Palatini formulations of
gravity. As a concrete example, we focus on a natural-inflation-like inflaton
potential, and show that the inflationary predictions fall into the allowed
region of cosmic mic... | [
{
"created": "Mon, 24 Dec 2018 09:39:59 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Mar 2019 03:02:25 GMT",
"version": "v2"
}
] | 2019-03-21 | [
[
"Jinno",
"Ryusuke",
""
],
[
"Kaneta",
"Kunio",
""
],
[
"Oda",
"Kin-ya",
""
],
[
"Park",
"Seong Chan",
""
]
] | A new setup of cosmic inflation with a periodic inflaton potential and conformal factor is discussed in the metric and Palatini formulations of gravity. As a concrete example, we focus on a natural-inflation-like inflaton potential, and show that the inflationary predictions fall into the allowed region of cosmic micro... |
gr-qc/0403047 | Carlo Rovelli | Winston Fairbairn, Carlo Rovelli | Separable Hilbert space in Loop Quantum Gravity | 14 pages, 3 figures. Version 2: several imprecisions corrected | J.Math.Phys. 45 (2004) 2802-2814 | 10.1063/1.1763247 | null | gr-qc | null | We study the separability of the state space of loop quantum gravity. In the
standard construction, the kinematical Hilbert space of the
diffeomorphism-invariant states is nonseparable. This is a consequence of the
fact that the knot-space of the equivalence classes of graphs under
diffeomorphisms is noncountable. Ho... | [
{
"created": "Thu, 11 Mar 2004 17:46:55 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2004 15:07:14 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Fairbairn",
"Winston",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We study the separability of the state space of loop quantum gravity. In the standard construction, the kinematical Hilbert space of the diffeomorphism-invariant states is nonseparable. This is a consequence of the fact that the knot-space of the equivalence classes of graphs under diffeomorphisms is noncountable. Howe... |
1808.07041 | Chiranjeeb Singha | Chiranjeeb Singha | Remarks on distinguishability of Schwarzschild spacetime and thermal
Minkowski spacetime using Resonance Casimir-Polder interaction | 17 pages | Mod.Phys.Lett. A35 (2020) no.02, 1950356 | 10.1142/S0217732319503565 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One perceives same response of a single-atom detector when placed at a point
outside the horizon in Schwarzschild spacetime to that of a static single-atom
detector in thermal Minkowski spacetime. So one cannot distinguish
Schwarzschild spacetime from thermal Minkowski spacetime by using a single-atom
detector. We sh... | [
{
"created": "Tue, 21 Aug 2018 17:51:08 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Sep 2019 06:05:23 GMT",
"version": "v2"
}
] | 2020-01-22 | [
[
"Singha",
"Chiranjeeb",
""
]
] | One perceives same response of a single-atom detector when placed at a point outside the horizon in Schwarzschild spacetime to that of a static single-atom detector in thermal Minkowski spacetime. So one cannot distinguish Schwarzschild spacetime from thermal Minkowski spacetime by using a single-atom detector. We show... |
1504.05790 | Avani Patel | Koushik Dutta, Sukanta Panda, Avani Patel | Curvature Singularity in f(R) Theories of Gravity | 15 pages, 4 figures, 1 table, minor changes in the text, a few
references added | Phys. Rev. D 92, 063503 (2015) | 10.1103/PhysRevD.92.063503 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although $f(R)$ modification of late time cosmology is successful in
explaining present cosmic acceleration, it is difficult to satisfy the
fifth-force constraint simultaneously. Even when the fifth-force constraint is
satisfied, the effective scalar degree of freedom may move to a point (close to
its potential minim... | [
{
"created": "Tue, 21 Apr 2015 15:50:39 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jul 2015 13:11:32 GMT",
"version": "v2"
}
] | 2015-09-09 | [
[
"Dutta",
"Koushik",
""
],
[
"Panda",
"Sukanta",
""
],
[
"Patel",
"Avani",
""
]
] | Although $f(R)$ modification of late time cosmology is successful in explaining present cosmic acceleration, it is difficult to satisfy the fifth-force constraint simultaneously. Even when the fifth-force constraint is satisfied, the effective scalar degree of freedom may move to a point (close to its potential minima)... |
1002.3399 | Waleed El Hanafy S. | M. I. Wanas, N. S. Awadalla and W. S. El Hanafy | Strong Field of Binary Systems And Its Effects On Pulsar Arrival Times | 24 pages, 2 figures, 1 table, 1 diagram. Comments: The estimated
numerical value of equation (6.6) has been corrected | null | null | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, the exact solution of Einstein's field equations which
has been given by Curzon in 1924 representing the field of a static binary
system is reviewed. An adapted version of this solution is obtained to describe
a dynamical binaries in a rotating coordinate system. It is shown that this
version of ... | [
{
"created": "Thu, 18 Feb 2010 05:39:46 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Sep 2012 17:21:41 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Sep 2012 13:35:03 GMT",
"version": "v3"
},
{
"created": "Thu, 27 Sep 2012 18:59:24 GMT",
"version": "v4"
},
{
"cre... | 2012-10-08 | [
[
"Wanas",
"M. I.",
""
],
[
"Awadalla",
"N. S.",
""
],
[
"Hanafy",
"W. S. El",
""
]
] | In the present work, the exact solution of Einstein's field equations which has been given by Curzon in 1924 representing the field of a static binary system is reviewed. An adapted version of this solution is obtained to describe a dynamical binaries in a rotating coordinate system. It is shown that this version of th... |
gr-qc/0408072 | Michael T. Anderson | Michael T. Anderson | Existence and stability of even dimensional asymptotically de Sitter
spaces | 15pp | Annales Henri Poincare 6 (2005) 801-820 | 10.1007/s00023-005-0224-x | null | gr-qc hep-th math.DG | null | A new proof of Friedrich's theorem on the existence and stability of
asymptotically de Sitter spaces in 3+1 dimensions is given, which extends to
all even dimensions. In addition, we characterize the possible limits of spaces
which are globally asymptotically de Sitter, to the past and future.
| [
{
"created": "Fri, 20 Aug 2004 16:55:24 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jan 2005 15:29:32 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Anderson",
"Michael T.",
""
]
] | A new proof of Friedrich's theorem on the existence and stability of asymptotically de Sitter spaces in 3+1 dimensions is given, which extends to all even dimensions. In addition, we characterize the possible limits of spaces which are globally asymptotically de Sitter, to the past and future. |
1105.2932 | Takashi Tamaki | Takashi Tamaki, Nobuyuki Sakai | How does gravity save or kill Q-balls? | 10 pages, 10 figures | Phys.Rev.D83:044027,2011 | 10.1103/PhysRevD.83.044027 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore stability of gravitating Q-balls with potential
$V_4(\phi)={m^2\over2}\phi^2-\lambda\phi^4+\frac{\phi^6}{M^2}$ via catastrophe
theory, as an extension of our previous work on Q-balls with potential
$V_3(\phi)={m^2\over2}\phi^2-\mu\phi^3+\lambda\phi^4$. In flat spacetime
Q-balls with $V_4$ in the thick-wall... | [
{
"created": "Sun, 15 May 2011 08:25:53 GMT",
"version": "v1"
}
] | 2011-05-18 | [
[
"Tamaki",
"Takashi",
""
],
[
"Sakai",
"Nobuyuki",
""
]
] | We explore stability of gravitating Q-balls with potential $V_4(\phi)={m^2\over2}\phi^2-\lambda\phi^4+\frac{\phi^6}{M^2}$ via catastrophe theory, as an extension of our previous work on Q-balls with potential $V_3(\phi)={m^2\over2}\phi^2-\mu\phi^3+\lambda\phi^4$. In flat spacetime Q-balls with $V_4$ in the thick-wall l... |
2008.10241 | Fazlay Ahmed | Fazlay Ahmed, Dharm Veer Singh, Sushant G Ghosh | 5D rotating regular Myers-Perry black holes and their shadow | 26 pages, 10 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is widely believed that the curvature singularities are an artifact of
general relativity and may not exist in the Universe, and likely to be defined
by the quantum gravity. In the absence of successful quantum gravity,
significant attention has been shifted towards the regular models. We present a
five-dimensiona... | [
{
"created": "Mon, 24 Aug 2020 07:57:50 GMT",
"version": "v1"
}
] | 2020-08-25 | [
[
"Ahmed",
"Fazlay",
""
],
[
"Singh",
"Dharm Veer",
""
],
[
"Ghosh",
"Sushant G",
""
]
] | It is widely believed that the curvature singularities are an artifact of general relativity and may not exist in the Universe, and likely to be defined by the quantum gravity. In the absence of successful quantum gravity, significant attention has been shifted towards the regular models. We present a five-dimensional ... |
1205.2586 | Ovidiu Cristinel Stoica | Ovidiu Cristinel Stoica | Metric dimensional reduction at singularities with implications to
Quantum Gravity | 24 pages, 1 figure, Annals of Physics
(http://www.sciencedirect.com/science/article/pii/S0003491614001080) | Annals of Physics 347C (2014), pp. 74-91 | 10.1016/j.aop.2014.04.027 | null | gr-qc hep-th math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A series of old and recent theoretical observations suggests that the
quantization of gravity would be feasible, and some problems of Quantum Field
Theory would go away if, somehow, the spacetime would undergo a dimensional
reduction at high energy scales. But an identification of the deep mechanism
causing this dime... | [
{
"created": "Fri, 11 May 2012 17:34:54 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Jun 2012 05:18:44 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Apr 2014 15:00:24 GMT",
"version": "v3"
},
{
"created": "Fri, 9 May 2014 15:22:17 GMT",
"version": "v4"
}
] | 2014-05-22 | [
[
"Stoica",
"Ovidiu Cristinel",
""
]
] | A series of old and recent theoretical observations suggests that the quantization of gravity would be feasible, and some problems of Quantum Field Theory would go away if, somehow, the spacetime would undergo a dimensional reduction at high energy scales. But an identification of the deep mechanism causing this dimens... |
gr-qc/0407031 | Laura Cadonati | L. Cadonati | Coherent Waveform Consistency Test for LIGO Burst Candidates | 11 pages, 9 figures. Submitted to the Proceedings of the 8th
Gravitational Wave Data Analysis Workshop, in Classic and Quantum Gravity | Class.Quant.Grav. 21 (2004) S1695-S1704 | 10.1088/0264-9381/21/20/012 | null | gr-qc | null | The burst search in LIGO relies on the coincident detection of transient
signals in multiple interferometers. As only minimal assumptions are made about
the event waveform or duration, the analysis pipeline requires loose
coincidence in time, frequency and amplitude. Confidence in the resulting
events and their wavef... | [
{
"created": "Wed, 7 Jul 2004 23:11:47 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Cadonati",
"L.",
""
]
] | The burst search in LIGO relies on the coincident detection of transient signals in multiple interferometers. As only minimal assumptions are made about the event waveform or duration, the analysis pipeline requires loose coincidence in time, frequency and amplitude. Confidence in the resulting events and their wavefor... |
2305.00652 | Yunqi Liu | Hong Guo, Chao Zhang, Yunqi Liu, Rui-Hong Yue, Yungui Gong, Bin Wang | Detecting the secondary spin with extreme mass ratio inspirals in
Scalar-Tensor theory | 30 pages, 8 figures | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the detectability of secondary spin in the
extreme mass ratio inspirals system within a modified gravity model coupled
with a scalar field. The central black hole, which reduces to a Kerr one, is
circularly spiralled by a scalar-charged spinning secondary body on the
equatorial plane. Th... | [
{
"created": "Mon, 1 May 2023 04:22:21 GMT",
"version": "v1"
}
] | 2023-05-02 | [
[
"Guo",
"Hong",
""
],
[
"Zhang",
"Chao",
""
],
[
"Liu",
"Yunqi",
""
],
[
"Yue",
"Rui-Hong",
""
],
[
"Gong",
"Yungui",
""
],
[
"Wang",
"Bin",
""
]
] | In this paper, we investigate the detectability of secondary spin in the extreme mass ratio inspirals system within a modified gravity model coupled with a scalar field. The central black hole, which reduces to a Kerr one, is circularly spiralled by a scalar-charged spinning secondary body on the equatorial plane. The ... |
gr-qc/9812096 | Ishwaree Prasad Neupane | Ishwaree P. Neupane | Cosmological Constant in de-Sitter Spacetime | 9 pages, Revtex, some correction | null | null | null | gr-qc | null | With the basic cosmological relations that agree with the recent
observations, simple expressions are suggested concerning the value of
cosmological constant($\Lambda$). A large contribution of quantum vacuum to the
energy momentum tensor does not agree with the observed cosmos. However,one
requires the presence of p... | [
{
"created": "Thu, 31 Dec 1998 08:55:27 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Feb 1999 03:17:37 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Neupane",
"Ishwaree P.",
""
]
] | With the basic cosmological relations that agree with the recent observations, simple expressions are suggested concerning the value of cosmological constant($\Lambda$). A large contribution of quantum vacuum to the energy momentum tensor does not agree with the observed cosmos. However,one requires the presence of pos... |
1108.1856 | Pankaj Jain | Pankaj Jain, Purnendu Karmakar, Subhadip Mitra, Sukanta Panda and
Naveen K. Singh | Testing Unimodular Gravity | 14 pages one figure, significantly revised with several new results
added | null | 10.1088/1475-7516/2012/05/020 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider models of gravitation that are based on unimodular general
coordinate transformations (GCT). These transformations include only those
which do not change the determinant of the metric. We treat the determinant as
a separate field which transforms as a scalar under unimodular GCT. We consider
a class of su... | [
{
"created": "Tue, 9 Aug 2011 05:29:17 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Aug 2011 05:58:51 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Feb 2012 05:46:12 GMT",
"version": "v3"
}
] | 2015-05-30 | [
[
"Jain",
"Pankaj",
""
],
[
"Karmakar",
"Purnendu",
""
],
[
"Mitra",
"Subhadip",
""
],
[
"Panda",
"Sukanta",
""
],
[
"Singh",
"Naveen K.",
""
]
] | We consider models of gravitation that are based on unimodular general coordinate transformations (GCT). These transformations include only those which do not change the determinant of the metric. We treat the determinant as a separate field which transforms as a scalar under unimodular GCT. We consider a class of such... |
0911.4870 | Albert Roura | Guillem P\'erez-Nadal, Albert Roura, Enric Verdaguer | Stress tensor fluctuations in de Sitter spacetime | 35 pages, 4 figures | JCAP 1005:036,2010 | 10.1088/1475-7516/2010/05/036 | AEI-2009-113 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The two-point function of the stress tensor operator of a quantum field in de
Sitter spacetime is calculated for an arbitrary number of dimensions. We assume
the field to be in the Bunch-Davies vacuum, and formulate our calculation in
terms of de Sitter-invariant bitensors. Explicit results for free minimally
coupled... | [
{
"created": "Wed, 25 Nov 2009 15:15:53 GMT",
"version": "v1"
}
] | 2010-06-15 | [
[
"Pérez-Nadal",
"Guillem",
""
],
[
"Roura",
"Albert",
""
],
[
"Verdaguer",
"Enric",
""
]
] | The two-point function of the stress tensor operator of a quantum field in de Sitter spacetime is calculated for an arbitrary number of dimensions. We assume the field to be in the Bunch-Davies vacuum, and formulate our calculation in terms of de Sitter-invariant bitensors. Explicit results for free minimally coupled s... |
0806.2254 | Oleg Kogan | Mihai Bondarescu, Oleg Kogan, Yanbei Chen | Optimal Light Beams and Mirror Shapes for Future LIGO Interferometers | 9 pages, 11 figures | Phys.Rev.D78:082002,2008 | 10.1103/PhysRevD.78.082002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report the results of a recent search for the lowest value of thermal
noise that can be achieved in LIGO by changing the shape of mirrors, while
fixing the mirror radius and maintaining a low diffractional loss. The result
of this minimization is a beam with thermal noise a factor of 2.32 (in power)
lower than pre... | [
{
"created": "Fri, 13 Jun 2008 02:30:09 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Jun 2008 11:40:56 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bondarescu",
"Mihai",
""
],
[
"Kogan",
"Oleg",
""
],
[
"Chen",
"Yanbei",
""
]
] | We report the results of a recent search for the lowest value of thermal noise that can be achieved in LIGO by changing the shape of mirrors, while fixing the mirror radius and maintaining a low diffractional loss. The result of this minimization is a beam with thermal noise a factor of 2.32 (in power) lower than previ... |
2004.03883 | Kazufumi Takahashi | Kazufumi Takahashi, Hayato Motohashi | General Relativity solutions with stealth scalar hair in quadratic
higher-order scalar-tensor theories | 14 pages | JCAP 06 (2020) 034 | 10.1088/1475-7516/2020/06/034 | KOBE-COSMO-20-05, YITP-20-35 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore General Relativity solutions with stealth scalar hair in general
quadratic higher-order scalar-tensor theories. Adopting the assumption that the
scalar field has a constant kinetic term, we derive in a fully covariant manner
a set of conditions under which the Euler-Lagrange equations allow General
Relativ... | [
{
"created": "Wed, 8 Apr 2020 08:44:58 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jun 2020 02:42:45 GMT",
"version": "v2"
}
] | 2020-06-18 | [
[
"Takahashi",
"Kazufumi",
""
],
[
"Motohashi",
"Hayato",
""
]
] | We explore General Relativity solutions with stealth scalar hair in general quadratic higher-order scalar-tensor theories. Adopting the assumption that the scalar field has a constant kinetic term, we derive in a fully covariant manner a set of conditions under which the Euler-Lagrange equations allow General Relativit... |
1201.4019 | Valery Kiselev | V. V. Kiselev, S. A. Timofeev | Cosmological bootstrap | 24 pages, 22 figures and diagrams, revtex4, references and notes
added | Phys.Part.Nucl.Lett. 9 (2012) 111-128 | 10.1134/S1547477112020100 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A huge value of cosmological constant characteristic for the particle physics
and the inflation of early Universe are inherently related to each other: one
can construct a fine-tuned superpotential, which produces a flat potential of
inflaton with a constant density of energy $V=\Lambda^4$ after taking into
account f... | [
{
"created": "Thu, 19 Jan 2012 10:57:08 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Apr 2012 06:27:29 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Kiselev",
"V. V.",
""
],
[
"Timofeev",
"S. A.",
""
]
] | A huge value of cosmological constant characteristic for the particle physics and the inflation of early Universe are inherently related to each other: one can construct a fine-tuned superpotential, which produces a flat potential of inflaton with a constant density of energy $V=\Lambda^4$ after taking into account for... |
gr-qc/9803023 | Renato Portugal | Renato Portugal | An Algorithm to Simplify Tensor Expressions | 15 pages, Latex2e, submitted to Computer Physics Communications:
Thematic Issue on "Computer Algebra in Physics Research" | Comput.Phys.Commun. 115 (1998) 215-230 | 10.1016/S0010-4655(98)00117-9 | CBPF-NF-xxx/98 | gr-qc | null | The problem of simplifying tensor expressions is addressed in two parts. The
first part presents an algorithm designed to put tensor expressions into a
canonical form, taking into account the symmetries with respect to index
permutations and the renaming of dummy indices. The tensor indices are split
into classes and... | [
{
"created": "Thu, 5 Mar 1998 16:05:17 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jul 1998 14:55:39 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Portugal",
"Renato",
""
]
] | The problem of simplifying tensor expressions is addressed in two parts. The first part presents an algorithm designed to put tensor expressions into a canonical form, taking into account the symmetries with respect to index permutations and the renaming of dummy indices. The tensor indices are split into classes and a... |
2111.15122 | Woei Chet Lim | Woei Chet Lim and Muhammad Zubair Ali Moughal | Transition analysis of the non-OT $G_2$ stiff fluid spike solution | 20 pages, 9 figures. Accepted by CQG | Class. Quantum Grav. 39 (2022) 025010 | 10.1088/1361-6382/ac3b9a | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We use the technique developed in Moughal's doctoral thesis to analyse the
joint spike transition, revealing new groups of worldlines which undergo
distinct transitions, and correcting misconceptions about spikes.
| [
{
"created": "Tue, 30 Nov 2021 04:47:08 GMT",
"version": "v1"
}
] | 2022-02-22 | [
[
"Lim",
"Woei Chet",
""
],
[
"Moughal",
"Muhammad Zubair Ali",
""
]
] | We use the technique developed in Moughal's doctoral thesis to analyse the joint spike transition, revealing new groups of worldlines which undergo distinct transitions, and correcting misconceptions about spikes. |
1511.02948 | Louis Clavelli | L. Clavelli | Finite Matter Resolution of the Cosmological Entropy Problem | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss how entropy bounds, which are not respected in the standard
cosmology, constrain the parameters of a previously suggested cosmology with a
finite total mass. In that alternative cosmology the matter density was
postulated to be a spatial delta function at the time of the big bang
thereafter diffusing rapid... | [
{
"created": "Tue, 10 Nov 2015 00:51:13 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Feb 2016 03:48:49 GMT",
"version": "v2"
}
] | 2016-02-09 | [
[
"Clavelli",
"L.",
""
]
] | We discuss how entropy bounds, which are not respected in the standard cosmology, constrain the parameters of a previously suggested cosmology with a finite total mass. In that alternative cosmology the matter density was postulated to be a spatial delta function at the time of the big bang thereafter diffusing rapidly... |
gr-qc/0106093 | Tsipenyuk Dmitry | D.Yu.Tsipenyuk and V.A.Andreev | Structure of Extended Space | 10 pages, PDF only,". submitted to the V International Conference on
Gravitation and Astrophysics of Asian - Pacific Countries (ICGA-2001),
Moscow, 1-7 October, 2001 | Kratk.Soobshch.Fiz. 6 (2000) 23-34; Bull.Lebedev Phys.Inst. 6
(2001) 18-29 | null | General Physics Institute preprint N5 26.05.1999 | gr-qc astro-ph | null | In present work the generalization of Einstein's special theory of relativity
on 5-dimentional space is considered, in which as fifth coordinates we consider
the interval s of a particle. 5-dimentional vectors in this space are isotropic
both for mass, and for massless of particles.
In extended space, offered by th... | [
{
"created": "Fri, 29 Jun 2001 06:00:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tsipenyuk",
"D. Yu.",
""
],
[
"Andreev",
"V. A.",
""
]
] | In present work the generalization of Einstein's special theory of relativity on 5-dimentional space is considered, in which as fifth coordinates we consider the interval s of a particle. 5-dimentional vectors in this space are isotropic both for mass, and for massless of particles. In extended space, offered by the au... |
gr-qc/9710070 | Danny Birmingham Staff | Danny Birmingham | A Closed Contour of Integration in Regge Calculus | 16 pages, Latex, To appear in Gen. Rel. Grav | Gen.Rel.Grav. 30 (1998) 83-103 | 10.1023/A:1018825017250 | null | gr-qc | null | The analytic structure of the Regge action on a cone in $d$ dimensions over a
boundary of arbitrary topology is determined in simplicial minisuperspace. The
minisuperspace is defined by the assignment of a single internal edge length to
all 1-simplices emanating from the cone vertex, and a single boundary edge
length... | [
{
"created": "Tue, 14 Oct 1997 10:48:50 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Birmingham",
"Danny",
""
]
] | The analytic structure of the Regge action on a cone in $d$ dimensions over a boundary of arbitrary topology is determined in simplicial minisuperspace. The minisuperspace is defined by the assignment of a single internal edge length to all 1-simplices emanating from the cone vertex, and a single boundary edge length t... |
gr-qc/9906054 | Bruce Allen | Bruce Allen (U. of Wisconsin - Milwaukee), Eanna Flanagan (Cornell
University), Maria Alessandra Papa (INFN, Frascati) | Is the squeezing of relic gravitational waves produced by inflation
detectable? | 17 pages, 4 Postscript figures, uses revtex, psfig, to be submitted
to PRD, minor revisions - appendix B clarified, corrected typos, added
references | Phys. Rev. D 61, 024024 (1999) | 10.1103/PhysRevD.61.024024 | WISC-MILW-99-TH-07 | gr-qc | null | Grishchuk has shown that the stochastic background of gravitational waves
produced by an inflationary phase in the early Universe has an unusual
property: it is not a stationary Gaussian random process. Due to squeezing, the
phases of the different waves are correlated in a deterministic way, arising
from the process... | [
{
"created": "Tue, 15 Jun 1999 17:05:05 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Jul 1999 01:30:01 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Allen",
"Bruce",
"",
"U. of Wisconsin - Milwaukee"
],
[
"Flanagan",
"Eanna",
"",
"Cornell\n University"
],
[
"Papa",
"Maria Alessandra",
"",
"INFN, Frascati"
]
] | Grishchuk has shown that the stochastic background of gravitational waves produced by an inflationary phase in the early Universe has an unusual property: it is not a stationary Gaussian random process. Due to squeezing, the phases of the different waves are correlated in a deterministic way, arising from the process o... |
2305.16011 | Jan Smit | Jan Smit | Co\"{o}rdinate transformations, metrics and black hole features in the
collapsed phase of EDT | 11 pages, 14 figures | null | null | null | gr-qc hep-lat | http://creativecommons.org/licenses/by/4.0/ | This is a companion article to `Using massless fields for observing black
hole features in the collapsed phase of Euclidean dynamical triangulations'
[1]. It clarifies a singular co\"{o}rdinate transformation of an $SO(4)$
invariant metric to the usual spherical co\"{o}rdinates in which, at an instant
of time called ... | [
{
"created": "Thu, 25 May 2023 12:50:55 GMT",
"version": "v1"
}
] | 2023-06-01 | [
[
"Smit",
"Jan",
""
]
] | This is a companion article to `Using massless fields for observing black hole features in the collapsed phase of Euclidean dynamical triangulations' [1]. It clarifies a singular co\"{o}rdinate transformation of an $SO(4)$ invariant metric to the usual spherical co\"{o}rdinates in which, at an instant of time called ze... |
1408.2628 | Bernard M. Nabet | Bernard M. Nabet and Barak Kol | Leading anomalies, the drift Hamiltonian and the relativistic two-body
system | 29 pages, 5 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest to solve for the motion of the two body problem in General
Relativity by identifying the leading violation of conserved quantities,
referred to as (relativistic) anomalies, ordered by the post-Newtonian order at
which they appear. This differs from the standard procedure of obtaining the
full solution up t... | [
{
"created": "Tue, 12 Aug 2014 06:17:30 GMT",
"version": "v1"
}
] | 2014-08-13 | [
[
"Nabet",
"Bernard M.",
""
],
[
"Kol",
"Barak",
""
]
] | We suggest to solve for the motion of the two body problem in General Relativity by identifying the leading violation of conserved quantities, referred to as (relativistic) anomalies, ordered by the post-Newtonian order at which they appear. This differs from the standard procedure of obtaining the full solution up to ... |
0709.1258 | Grigory Volovik | G.E. Volovik | Fermi-point scenario for emergent gravity | 10 pages, 6 figures, draft for proceedings of conference "From
Quantum to Emergent Gravity: Theory and Phenomenology", Trieste June 11-15
(2007), revised after referee report | proceedings of "From Quantum to Emergent Gravity: Theory and
Phenomenology" PoS(QG-Ph)043 (2007) | null | null | gr-qc cond-mat.stat-mech hep-ph | null | Let us assume that gravity is an emergent low-energy phenomenon arising from
a topologically stable defect in momentum space -- the Fermi point. What are
the consequences? We discuss the natural values of fermion masses and
cosmological constant; flatness of the Universe; bounds on Lorentz violation;
etc.
| [
{
"created": "Sun, 9 Sep 2007 09:57:39 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Sep 2007 14:06:45 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Jan 2008 18:31:32 GMT",
"version": "v3"
}
] | 2008-02-26 | [
[
"Volovik",
"G. E.",
""
]
] | Let us assume that gravity is an emergent low-energy phenomenon arising from a topologically stable defect in momentum space -- the Fermi point. What are the consequences? We discuss the natural values of fermion masses and cosmological constant; flatness of the Universe; bounds on Lorentz violation; etc. |
1610.02893 | Andronikos Paliathanasis | Andronikos Paliathanasis, John D. Barrow and Supriya Pan | Cosmological solutions with gravitational particle production and
non-zero curvature | 17 pages, 6 figures; version accepted for publication by Phys. Rev. D | Phys. Rev. D 95, 103516 (2017) | 10.1103/PhysRevD.95.103516 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a homogeneous and isotropic universe with non-zero spatial curvature we
consider the effects of gravitational particle production in the dynamics of
the universe. We show that the dynamics of the universe in such a background is
characterized by a single nonlinear differential equation which is
significantly depen... | [
{
"created": "Mon, 10 Oct 2016 12:59:55 GMT",
"version": "v1"
},
{
"created": "Thu, 4 May 2017 14:48:29 GMT",
"version": "v2"
}
] | 2017-05-31 | [
[
"Paliathanasis",
"Andronikos",
""
],
[
"Barrow",
"John D.",
""
],
[
"Pan",
"Supriya",
""
]
] | In a homogeneous and isotropic universe with non-zero spatial curvature we consider the effects of gravitational particle production in the dynamics of the universe. We show that the dynamics of the universe in such a background is characterized by a single nonlinear differential equation which is significantly depende... |
0906.3636 | Diego Julio Cirilo-Lombardo | D.J. Cirilo Lombardo | Charge without charge, regular spherically symmetric solutions and the
Einstein-Born-Infeld theory | Figures in Int J Theor Phys (Online First) | Int.J.Theor.Phys.48:2267-2285,2009 | 10.1007/s10773-009-0015-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this paper is to continue the research of JMP 46, 042501 (2005) of
regular static spherically symmetric spacetimes in Einstein-Born-Infeld
theories from the point of view of the spacetime geometry and the
electromagnetic structure. The energy conditions, geodesic completeness and the
main features of the h... | [
{
"created": "Fri, 19 Jun 2009 10:33:43 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Lombardo",
"D. J. Cirilo",
""
]
] | The aim of this paper is to continue the research of JMP 46, 042501 (2005) of regular static spherically symmetric spacetimes in Einstein-Born-Infeld theories from the point of view of the spacetime geometry and the electromagnetic structure. The energy conditions, geodesic completeness and the main features of the hor... |
2204.12369 | Susobhan Mandal | Golam Mortuza Hossain and Susobhan Mandal | Origin of primeval seed magnetism in rotating astrophysical bodies | 5 pages, 2 figures, revtex4, improved discussion on the strength of
seed field in rotating stars and galaxies | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a primeval seed magnetic field arises due to spin-degeneracy
breaking of fermions caused by the dragging of inertial frames in the curved
spacetime of rotating astrophysical bodies. This seed magnetic field would
arise even due to electrically neutral fermions such as neutrons. As an
example, we show tha... | [
{
"created": "Tue, 26 Apr 2022 15:09:19 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Jan 2023 12:01:20 GMT",
"version": "v2"
}
] | 2023-01-31 | [
[
"Hossain",
"Golam Mortuza",
""
],
[
"Mandal",
"Susobhan",
""
]
] | We show that a primeval seed magnetic field arises due to spin-degeneracy breaking of fermions caused by the dragging of inertial frames in the curved spacetime of rotating astrophysical bodies. This seed magnetic field would arise even due to electrically neutral fermions such as neutrons. As an example, we show that ... |
0709.0285 | Burkhard Kleihaus | Rustam Ibadov, Burkhard Kleihaus, Jutta Kunz and Ulrike Neemann | Gravitating Dyons with Large Electric Charge | 10 pages, 4 figures | Phys.Lett.B659:421-428,2008 | 10.1016/j.physletb.2007.10.047 | null | gr-qc | null | We consider non-Abelian dyons in Einstein-Yang-Mills-Higgs theory. The dyons
are spherically symmetric with unit magnetic charge. For large values of the
electric charge the dyons approach limiting solutions, related to the Penney
solutions of Einstein-Maxwell-scalar theory.
| [
{
"created": "Mon, 3 Sep 2007 18:04:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ibadov",
"Rustam",
""
],
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Neemann",
"Ulrike",
""
]
] | We consider non-Abelian dyons in Einstein-Yang-Mills-Higgs theory. The dyons are spherically symmetric with unit magnetic charge. For large values of the electric charge the dyons approach limiting solutions, related to the Penney solutions of Einstein-Maxwell-scalar theory. |
1509.00163 | Spyros Basilakos | J. A. S. Lima, Spyros Basilakos and Joan Sol\`a | Thermodynamical aspects of running vacuum models | 15 pages in free style, 2 figures, to appear in European Phys.
Journal C.,(this work generalizes that of arXiv:1412.5196) | Eur. Phys. J. C (2016) 76:228 | 10.1140/epjc/s10052-016-4060-6 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The thermal history of a large class of running vacuum models in which the
effective cosmological term is described by a truncated power series of the
Hubble rate, whose dominant term is $\Lambda (H) \propto H^{n+2}$, is discussed
in detail. Specifically, by assuming that the ultra-relativistic particles
produced by ... | [
{
"created": "Tue, 1 Sep 2015 07:30:11 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Feb 2016 16:31:46 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Apr 2016 05:45:49 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Apr 2016 06:27:59 GMT",
"version": "v4"
}
] | 2016-04-29 | [
[
"Lima",
"J. A. S.",
""
],
[
"Basilakos",
"Spyros",
""
],
[
"Solà",
"Joan",
""
]
] | The thermal history of a large class of running vacuum models in which the effective cosmological term is described by a truncated power series of the Hubble rate, whose dominant term is $\Lambda (H) \propto H^{n+2}$, is discussed in detail. Specifically, by assuming that the ultra-relativistic particles produced by th... |
1508.00461 | Jun-Qi Guo | Jun-Qi Guo, Pankaj S. Joshi | Interior dynamics of neutral and charged black holes in f(R) gravity | 35 pages, 22 figures. (Special Issue. Modified Gravity Cosmology:
From Inflation to Dark Energy). Minor change. arXiv admin note: substantial
text overlap with arXiv:1507.01806 | Universe, 1, 239 (2015) | 10.3390/universe1020239 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we explore the interior dynamics of neutral and charged black
holes in $f(R)$ gravity. We transform $f(R)$ gravity from the Jordan frame into
the Einstein frame and simulate scalar collapses in flat, Schwarzschild, and
Reissner-Nordstr\"om geometries. In simulating scalar collapses in
Schwarzschild and... | [
{
"created": "Mon, 3 Aug 2015 15:54:52 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Oct 2015 01:30:54 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Dec 2015 09:15:38 GMT",
"version": "v3"
}
] | 2015-12-02 | [
[
"Guo",
"Jun-Qi",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | In this paper, we explore the interior dynamics of neutral and charged black holes in $f(R)$ gravity. We transform $f(R)$ gravity from the Jordan frame into the Einstein frame and simulate scalar collapses in flat, Schwarzschild, and Reissner-Nordstr\"om geometries. In simulating scalar collapses in Schwarzschild and R... |
gr-qc/0607046 | Felix Finster | Felix Finster, Joel Smoller | Decay of Solutions of the Teukolsky Equation for Higher Spin in the
Schwarzschild Geometry | 32 pages, LaTeX, 2 figures, error in expression for energy density of
gravitational waves corrected | Adv.Theor.Math.Phys. 13 (2009) 71-110, erratum
Adv.Theor.Math.Phys. 20 (2016) 1485-1486 | 10.4310/ATMP.2009.v13.n1.a3 | null | gr-qc astro-ph math-ph math.FA math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that the Schwarzschild black hole is linearly stable under
electromagnetic and gravitational perturbations. Our method is to show that for
spin $s=1$ or $s=2$, solutions of the Teukolsky equation with smooth, compactly
supported initial data outside the event horizon, decay in $L^\infty_{loc}$.
| [
{
"created": "Tue, 11 Jul 2006 16:25:44 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jul 2006 09:48:12 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Dec 2006 09:04:41 GMT",
"version": "v3"
},
{
"created": "Mon, 6 Oct 2008 15:13:40 GMT",
"version": "v4"
},
{
"cr... | 2017-08-29 | [
[
"Finster",
"Felix",
""
],
[
"Smoller",
"Joel",
""
]
] | We prove that the Schwarzschild black hole is linearly stable under electromagnetic and gravitational perturbations. Our method is to show that for spin $s=1$ or $s=2$, solutions of the Teukolsky equation with smooth, compactly supported initial data outside the event horizon, decay in $L^\infty_{loc}$. |
2304.09760 | Benrong Mu | Yue Song, Benrong Mu | Thermodynamic Instabilities of Conformal Gravity Holography in Four
Dimensions | 13 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a conjecture has been proposed, which indicates a correlation
between super-entropy black holes and the thermodynamic instability
\cite{Cong:2019bud}. W.Cong et al. suggested that the $C_{V}$ (specific heat
capacity at constant volume) and $C_{P}$ (specific heat capacity at constant
pressure) of a super-ent... | [
{
"created": "Tue, 18 Apr 2023 15:11:03 GMT",
"version": "v1"
}
] | 2023-04-20 | [
[
"Song",
"Yue",
""
],
[
"Mu",
"Benrong",
""
]
] | Recently, a conjecture has been proposed, which indicates a correlation between super-entropy black holes and the thermodynamic instability \cite{Cong:2019bud}. W.Cong et al. suggested that the $C_{V}$ (specific heat capacity at constant volume) and $C_{P}$ (specific heat capacity at constant pressure) of a super-entro... |
2008.09135 | Parampreet Singh | Bao-Fei Li, Javier Olmedo, Parampreet Singh and Anzhong Wang | Primordial scalar power spectrum from the hybrid approach in loop
cosmologies | Minor revision. To appear in Phys. Rev. D | Phys. Rev. D 102, 126025 (2020) | 10.1103/PhysRevD.102.126025 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the primordial scalar power spectra in the loop cosmological
models using the effective dynamics of the hybrid approach to cosmological
perturbations in which the background is loop quantized but the perturbations
are Fock quantized. The three loop cosmological models under consideration are
the standard L... | [
{
"created": "Thu, 20 Aug 2020 18:01:00 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Dec 2020 22:29:04 GMT",
"version": "v2"
}
] | 2021-01-04 | [
[
"Li",
"Bao-Fei",
""
],
[
"Olmedo",
"Javier",
""
],
[
"Singh",
"Parampreet",
""
],
[
"Wang",
"Anzhong",
""
]
] | We compare the primordial scalar power spectra in the loop cosmological models using the effective dynamics of the hybrid approach to cosmological perturbations in which the background is loop quantized but the perturbations are Fock quantized. The three loop cosmological models under consideration are the standard LQC... |
1911.11590 | Barak Shoshany | Jacob Hauser and Barak Shoshany | Time Travel Paradoxes and Multiple Histories | 29 pages, 17 figures | Phys. Rev. D 102, 064062 (2020) | 10.1103/PhysRevD.102.064062 | null | gr-qc physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If time travel is possible, it seems to inevitably lead to paradoxes. These
include consistency paradoxes, such as the famous grandfather paradox, and
bootstrap paradoxes, where something is created out of nothing. One proposed
class of resolutions to these paradoxes allows for multiple histories (or
timelines), such... | [
{
"created": "Mon, 25 Nov 2019 18:27:25 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Sep 2020 14:31:23 GMT",
"version": "v2"
}
] | 2020-09-25 | [
[
"Hauser",
"Jacob",
""
],
[
"Shoshany",
"Barak",
""
]
] | If time travel is possible, it seems to inevitably lead to paradoxes. These include consistency paradoxes, such as the famous grandfather paradox, and bootstrap paradoxes, where something is created out of nothing. One proposed class of resolutions to these paradoxes allows for multiple histories (or timelines), such t... |
gr-qc/0209046 | James B. Hartle | James B. Hartle (University of California, Santa Barbara) | The State of the Universe | 8 pages, LaTex | The Future of Theoretical Physics and Coamology, ed by G.W.
Gibbons, E.P.S. Shellard, and S.J. Rankin, Cambridge University Press,
Cambridge, 2003 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | What is the quantum state of the universe? That is the central question of
quantum cosmology. This essay describes the place of that quantum state in a
final theory governing the regularities exhibited universally by all physical
systems in the universe. It is possible that this final theory consists of two
parts: (1... | [
{
"created": "Fri, 13 Sep 2002 21:52:43 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Apr 2020 22:05:32 GMT",
"version": "v2"
}
] | 2020-04-29 | [
[
"Hartle",
"James B.",
"",
"University of California, Santa Barbara"
]
] | What is the quantum state of the universe? That is the central question of quantum cosmology. This essay describes the place of that quantum state in a final theory governing the regularities exhibited universally by all physical systems in the universe. It is possible that this final theory consists of two parts: (1) ... |
gr-qc/9912052 | Jose Navarro-Salas | J. Cruz, A. Fabbri, D. J. Navarro, J. Navarro-Salas and P. Navarro | Integrable models, degenerate horizons and AdS_2 black holes | 4 pages, LaTeX file, uses espcrc2.sty. Talk given at the Third
Conference on Constrained Dynamics and Quantum Gravity | Nucl.Phys.Proc.Suppl. 88 (2000) 287-290 | 10.1016/S0920-5632(00)00787-8 | null | gr-qc hep-th | null | The near extremal Reissner-Nordstrom black holes in arbitrary dimensions ca
be modeled by the Jackiw-Teitelboim (JT) theory. The asymptotic Virasoro
symmetry of the corresponding JT model exactly reproduces, via Cardy's formula,
the deviation of the Bekenstein-Hawking entropy of the Reissner-Nordstrom black
holes fro... | [
{
"created": "Tue, 14 Dec 1999 10:43:22 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Cruz",
"J.",
""
],
[
"Fabbri",
"A.",
""
],
[
"Navarro",
"D. J.",
""
],
[
"Navarro-Salas",
"J.",
""
],
[
"Navarro",
"P.",
""
]
] | The near extremal Reissner-Nordstrom black holes in arbitrary dimensions ca be modeled by the Jackiw-Teitelboim (JT) theory. The asymptotic Virasoro symmetry of the corresponding JT model exactly reproduces, via Cardy's formula, the deviation of the Bekenstein-Hawking entropy of the Reissner-Nordstrom black holes from ... |
gr-qc/0104021 | josep M. Pons | J. M. Pons | Observables, gauge invariance, and the role of the observers in the
limit from general relativity to special relativity | 17 pages | Class.Quant.Grav. 18 (2001) 4763-4778 | 10.1088/0264-9381/18/22/304 | null | gr-qc | null | Some conceptual issues concerning general invariant theories, with special
emphasis on general relativity, are analyzed. The common assertion that
observables must be required to be gauge invariant is examined in the light of
the role played by a system of observers. Some features of the reduction of the
gauge group ... | [
{
"created": "Fri, 6 Apr 2001 15:59:55 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Apr 2001 11:23:48 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Pons",
"J. M.",
""
]
] | Some conceptual issues concerning general invariant theories, with special emphasis on general relativity, are analyzed. The common assertion that observables must be required to be gauge invariant is examined in the light of the role played by a system of observers. Some features of the reduction of the gauge group ar... |
gr-qc/0303012 | Soumen Basak | Soumen Basak, Parthasarathi Majumdar | Reflection coefficient for superresonant scattering | 7 pages | Class.Quant.Grav.20:2929-2936,2003 | 10.1088/0264-9381/20/13/335 | null | gr-qc | null | We investigate superresonant scattering of acoustic disturbances from a
rotating acoustic black hole in the low frequency range. We derive an
expression for the reflection coefficient, exhibiting its frequency dependence
in this regime.
| [
{
"created": "Mon, 3 Mar 2003 17:27:23 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Basak",
"Soumen",
""
],
[
"Majumdar",
"Parthasarathi",
""
]
] | We investigate superresonant scattering of acoustic disturbances from a rotating acoustic black hole in the low frequency range. We derive an expression for the reflection coefficient, exhibiting its frequency dependence in this regime. |
gr-qc/0312074 | Ernest Tagirov | E.A.Tagirov (Joint Institute for Nuclear Research) | Effective Space Quantization in Friedman-Robertson-Walker Models | 7 pages | Grav.Cosmol. 9 (2003) 256-258 | null | null | gr-qc | null | Quantum--mechanical operators corresponding to canonical momentum and
position of a point--like particle, which follow from the quantum field theory
in the general Riemannian space-time, satisfy generally to a deformation of the
canonical commutation relations with $c^{-2}$ as the parameter of deformation.
For operat... | [
{
"created": "Tue, 16 Dec 2003 20:30:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tagirov",
"E. A.",
"",
"Joint Institute for Nuclear Research"
]
] | Quantum--mechanical operators corresponding to canonical momentum and position of a point--like particle, which follow from the quantum field theory in the general Riemannian space-time, satisfy generally to a deformation of the canonical commutation relations with $c^{-2}$ as the parameter of deformation. For operator... |
0804.4222 | Florian Beyer | Florian Beyer | A spectral solver for evolution problems with spatial S3-topology | 29 pages, 11 figures, uses psfrag and hyperref, large parts rewritten
in order to match to the requirements of the journal, conclusions unchanged;
J. Comput. Phys. (2009) | null | 10.1016/j.jcp.2009.05.037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a single patch collocation method in order to compute solutions
of initial value problems of partial differential equations whose spatial
domains are 3-spheres. Besides the main ideas, we discuss issues related to our
implementation and analyze numerical test applications. Our main interest lies
in cosmo... | [
{
"created": "Sat, 26 Apr 2008 16:37:22 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Jun 2009 08:46:21 GMT",
"version": "v2"
}
] | 2009-06-29 | [
[
"Beyer",
"Florian",
""
]
] | We introduce a single patch collocation method in order to compute solutions of initial value problems of partial differential equations whose spatial domains are 3-spheres. Besides the main ideas, we discuss issues related to our implementation and analyze numerical test applications. Our main interest lies in cosmolo... |
1203.5166 | Harald P. Pfeiffer | Harald P. Pfeiffer | Numerical simulations of compact object binaries | Minor corrections, including typos and grammar | null | 10.1088/0264-9381/29/12/124004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Coalescing compact object binaries consisting of black holes and/or Neutron
stars are a prime target for ground-based gravitational wave detectors. This
article reviews the status of numerical simulations of these systems, with an
emphasis on recent progress.
| [
{
"created": "Fri, 23 Mar 2012 03:20:50 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Apr 2012 06:17:25 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Pfeiffer",
"Harald P.",
""
]
] | Coalescing compact object binaries consisting of black holes and/or Neutron stars are a prime target for ground-based gravitational wave detectors. This article reviews the status of numerical simulations of these systems, with an emphasis on recent progress. |
gr-qc/9606056 | Filipe de Moraes Paiva | F. M. Paiva, M. J. Rebou\c{c}as, A. F. F. Teixeira | Limits of space-times in five dimensions and their relation to the Segre
Types | Latex | J.Math.Phys. 38 (1997) 4228-4236 | 10.1063/1.532091 | CBPF-NF-034/96 | gr-qc astro-ph | null | A limiting diagram for the Segre classification in 5-dimensional space-times
is obtained, extending a recent work on limits of the energy-momentum tensor in
general relativity. Some of Geroch's results on limits of space-times in
general relativity are also extended to the context of five-dimensional
Kaluza-Klein spa... | [
{
"created": "Tue, 18 Jun 1996 18:13:06 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Paiva",
"F. M.",
""
],
[
"Rebouças",
"M. J.",
""
],
[
"Teixeira",
"A. F. F.",
""
]
] | A limiting diagram for the Segre classification in 5-dimensional space-times is obtained, extending a recent work on limits of the energy-momentum tensor in general relativity. Some of Geroch's results on limits of space-times in general relativity are also extended to the context of five-dimensional Kaluza-Klein space... |
2209.08817 | Andronikos Paliathanasis | Andronikos Paliathanasis | Classical and quantum cosmological solutions in teleparallel dark energy
with anisotropic background geometry | 21 pages, no figures | null | null | null | gr-qc hep-ph math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We investigate exact and analytic solutions for the field equations in
teleparallel dark energy model where the physical space is described by the
locally rotational symmetric Bianchi I, Bianchi III and Kantowski-Sachs
geometries. We make use of the property that a point-like Lagrangian exist for
the description of t... | [
{
"created": "Mon, 19 Sep 2022 08:04:40 GMT",
"version": "v1"
}
] | 2022-09-20 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | We investigate exact and analytic solutions for the field equations in teleparallel dark energy model where the physical space is described by the locally rotational symmetric Bianchi I, Bianchi III and Kantowski-Sachs geometries. We make use of the property that a point-like Lagrangian exist for the description of the... |
0704.1350 | Tertychniy Sergey | S. Tertychniy | Specialized computer algebra system for application in general
relativity | null | null | null | null | gr-qc | null | A brief characteristic of the specialized computer algebra system GRG_EC
intended for symbolic computations in the field of general relativity is given.
| [
{
"created": "Wed, 11 Apr 2007 06:15:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tertychniy",
"S.",
""
]
] | A brief characteristic of the specialized computer algebra system GRG_EC intended for symbolic computations in the field of general relativity is given. |
1612.07749 | Eolo Di Casola | Alessio Belenchia, Marco Letizia, Stefano Liberati, Eolo Di Casola | Higher-order theories of gravity: diagnosis, extraction and
reformulation via non-metric extra degrees of freedom | 85 pages; typos corrected, references added; conclusions improved | Rept.Prog.Phys. 81 (2018) no.3, 036001 | 10.1088/1361-6633/aaa4ab | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modifications of Einstein's theory of gravitation have been extensively
considered in the past years, in connection to both cosmology and quantum
gravity. Higher-curvature and higher-derivative gravity theories constitute the
main examples of such modifications. These theories exhibit, in general, more
degrees of fre... | [
{
"created": "Thu, 22 Dec 2016 18:52:33 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2017 13:56:34 GMT",
"version": "v2"
}
] | 2018-07-19 | [
[
"Belenchia",
"Alessio",
""
],
[
"Letizia",
"Marco",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Di Casola",
"Eolo",
""
]
] | Modifications of Einstein's theory of gravitation have been extensively considered in the past years, in connection to both cosmology and quantum gravity. Higher-curvature and higher-derivative gravity theories constitute the main examples of such modifications. These theories exhibit, in general, more degrees of freed... |
1206.0832 | Manfred Requardt | Manfred Requardt | Observables need not be diffeomorphism invariant in Classical and
Quantum Gravity | 10 pages, latex | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of observables in classical and quantum gravity is a
long-standing one. It is sometimes argued that observable quantities should be
diffeomorphsm invariant, following the philosophy of Dirac. We argue that
diffeomorphism invariance in classical and quantum gravity is not primarily a
case of gauge invarian... | [
{
"created": "Tue, 5 Jun 2012 07:49:03 GMT",
"version": "v1"
}
] | 2012-06-06 | [
[
"Requardt",
"Manfred",
""
]
] | The problem of observables in classical and quantum gravity is a long-standing one. It is sometimes argued that observable quantities should be diffeomorphsm invariant, following the philosophy of Dirac. We argue that diffeomorphism invariance in classical and quantum gravity is not primarily a case of gauge invariance... |
0711.5022 | Maurizio Gasperini | L. Amendola, M. Gasperini and C. Ungarelli | Non-local dilaton coupling to dark matter: cosmic acceleration and
pressure backreaction | 11 pages, 1 figure eps | Phys.Rev.D77:123526,2008 | 10.1103/PhysRevD.77.123526 | BA-TH/07-583 | gr-qc astro-ph hep-th | null | A model of non-local dilaton interactions, motivated by string duality
symmetries, is applied to a scenario of "coupled quintessence" in which the
dilaton dark energy is non-locally coupled to the dark-matter sources. It is
shown that the non-local effects tend to generate a backreaction which -- for
strong enough co... | [
{
"created": "Fri, 30 Nov 2007 20:03:16 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Amendola",
"L.",
""
],
[
"Gasperini",
"M.",
""
],
[
"Ungarelli",
"C.",
""
]
] | A model of non-local dilaton interactions, motivated by string duality symmetries, is applied to a scenario of "coupled quintessence" in which the dilaton dark energy is non-locally coupled to the dark-matter sources. It is shown that the non-local effects tend to generate a backreaction which -- for strong enough coup... |
1908.02808 | D\'aniel Barta | D\'aniel Barta | Fundamental and higher-order excited modes of radial oscillation of
neutron stars for various types of cold nucleonic and hyperonic matter | null | Class. Quantum Grav. 38 (2021) 185002 | 10.1088/1361-6382/ac12e2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This research paper complements our earlier qualitative study of the effect
of viscosity and thermal conductivity on the radial oscillation and relaxation
of non-rotating neutron stars. The fundamental and first two lowest-frequency
excited modes of radial oscillation have been computed in the high nuclear
density re... | [
{
"created": "Wed, 7 Aug 2019 19:40:14 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2020 09:09:30 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Oct 2020 16:31:38 GMT",
"version": "v3"
}
] | 2021-08-23 | [
[
"Barta",
"Dániel",
""
]
] | This research paper complements our earlier qualitative study of the effect of viscosity and thermal conductivity on the radial oscillation and relaxation of non-rotating neutron stars. The fundamental and first two lowest-frequency excited modes of radial oscillation have been computed in the high nuclear density regi... |
1007.0293 | Victor N. Pervushin | A.B. Arbuzov, B.M. Barbashov, R.G. Nazmitdinov, V.N. Pervushin, A.
Borowiec, K.N. Pichugin, A.F. Zakharov | Conformal Hamiltonian Dynamics of General Relativity | 9 pages, 1 figure, submitted to PLB | Phys.Lett.B691:230-233,2010 | 10.1016/j.physletb.2010.06.042 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The General Relativity formulated with the aid of the spin connection
coefficients is considered in the finite space geometry of similarity with the
Dirac scalar dilaton. We show that the redshift evolution of the General
Relativity describes the vacuum creation of the matter in the empty Universe at
the electroweak ... | [
{
"created": "Fri, 2 Jul 2010 05:03:16 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Arbuzov",
"A. B.",
""
],
[
"Barbashov",
"B. M.",
""
],
[
"Nazmitdinov",
"R. G.",
""
],
[
"Pervushin",
"V. N.",
""
],
[
"Borowiec",
"A.",
""
],
[
"Pichugin",
"K. N.",
""
],
[
"Zakharov",
"A. F.",
""
]
] | The General Relativity formulated with the aid of the spin connection coefficients is considered in the finite space geometry of similarity with the Dirac scalar dilaton. We show that the redshift evolution of the General Relativity describes the vacuum creation of the matter in the empty Universe at the electroweak ep... |
gr-qc/0308044 | Shouyong Pei | L. Liu and S.Y. Pei | Sommerfeld's quantum condition of action and the spectra of
Schwarzschild black hole | 7 pages, no figures, submitted to Classical and Quantum Gravity | Chin.Phys.Lett. 21 (2004) 1887-1889 | 10.1088/0256-307X/21/10/006 | BNU-03-66 | gr-qc | null | If the situation of quantum gravity nowadays is nearly the same as that of
the quantum mechanics in it's early time of Bohr and Sommerfeld, then a first
step study of the quantum gravity from Sommerfeld's quantum condition of action
might be helpful. In this short paper the spectra of Schwarzschild black
hole(SBH) in... | [
{
"created": "Thu, 14 Aug 2003 12:58:53 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Liu",
"L.",
""
],
[
"Pei",
"S. Y.",
""
]
] | If the situation of quantum gravity nowadays is nearly the same as that of the quantum mechanics in it's early time of Bohr and Sommerfeld, then a first step study of the quantum gravity from Sommerfeld's quantum condition of action might be helpful. In this short paper the spectra of Schwarzschild black hole(SBH) in q... |
2208.02617 | S. Davood Sadatian | S. Davood Sadatian and A. Sabouri | Agegraphic Model based on the Generalized Uncertainty Principle | 23 pages, 28 figures, Accepted for publication in IJGMMP | null | 10.1142/S021988782250205X | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Many models of dark energy have been proposed to describe the universe since
the beginning of the Big Bang. In this study, we present a new model of
agegraphic dark energy ($NADE$) based on the three generalized uncertainty
principles $KMM$ (Kempf, Mangan, Mann), Nouicer and $GUP^{*}$ ( higher orders
generalized unce... | [
{
"created": "Mon, 1 Aug 2022 06:40:21 GMT",
"version": "v1"
}
] | 2022-08-05 | [
[
"Sadatian",
"S. Davood",
""
],
[
"Sabouri",
"A.",
""
]
] | Many models of dark energy have been proposed to describe the universe since the beginning of the Big Bang. In this study, we present a new model of agegraphic dark energy ($NADE$) based on the three generalized uncertainty principles $KMM$ (Kempf, Mangan, Mann), Nouicer and $GUP^{*}$ ( higher orders generalized uncert... |
gr-qc/0402038 | Nelson Christensen | Nelson Christensen, R\'ejean J. Dupuis, Graham Woan, Renate Meyer | A Metropolis-Hastings algorithm for extracting periodic gravitational
wave signals from laser interferometric detector data | null | Phys.Rev. D70 (2004) 022001 | 10.1103/PhysRevD.70.022001 | null | gr-qc | null | The Markov chain Monte Carlo methods offer practical procedures for detecting
signals characterized by a large number of parameters and under conditions of
low signal-to-noise ratio. We present a Metropolis-Hastings algorithm capable
of inferring the spin and orientation parameters of a neutron star from its
periodic... | [
{
"created": "Fri, 6 Feb 2004 19:45:48 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Christensen",
"Nelson",
""
],
[
"Dupuis",
"Réjean J.",
""
],
[
"Woan",
"Graham",
""
],
[
"Meyer",
"Renate",
""
]
] | The Markov chain Monte Carlo methods offer practical procedures for detecting signals characterized by a large number of parameters and under conditions of low signal-to-noise ratio. We present a Metropolis-Hastings algorithm capable of inferring the spin and orientation parameters of a neutron star from its periodic g... |
2403.04683 | Diego S\'aez-Chill\'on G\'omez | Albert Duran-Cabac\'es and Diego S\'aez-Chill\'on G\'omez | Propagation and emission of gravitational waves in the weak-field limit
within the Palatini formalism | 10 pages, extra analysis, conclusions updated and additional
references | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the era of gravitational waves physics, when detections of wave fronts are
increasing in number, sensibility, frequencies and distances, gravitational
physics has entered a period of maximum activity and brilliance. This has open
a new window where General Relativity can be challenged in both weak as
strong-field ... | [
{
"created": "Thu, 7 Mar 2024 17:27:39 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2024 14:42:35 GMT",
"version": "v2"
}
] | 2024-04-03 | [
[
"Duran-Cabacés",
"Albert",
""
],
[
"Gómez",
"Diego Sáez-Chillón",
""
]
] | In the era of gravitational waves physics, when detections of wave fronts are increasing in number, sensibility, frequencies and distances, gravitational physics has entered a period of maximum activity and brilliance. This has open a new window where General Relativity can be challenged in both weak as strong-field re... |
1504.02498 | Alfredo Sandoval-Villalbazo | A. L. Garcia-Perciante, A. Sandoval-Villalbazo, D. Brun-Battistini | Relativistic heat flux for a single component charged fluid in the
presence of an electromagnetic field | 12 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Transport properties in gases are significantly affected by temperature. In
previous works it has been shown that when the thermal agitation in a gas is
high enough, such that relativistic effects become relevant, heat dissipation
is driven not solely by a temperature gradient but also by other vector forces.
In the ... | [
{
"created": "Thu, 9 Apr 2015 21:01:32 GMT",
"version": "v1"
}
] | 2015-04-13 | [
[
"Garcia-Perciante",
"A. L.",
""
],
[
"Sandoval-Villalbazo",
"A.",
""
],
[
"Brun-Battistini",
"D.",
""
]
] | Transport properties in gases are significantly affected by temperature. In previous works it has been shown that when the thermal agitation in a gas is high enough, such that relativistic effects become relevant, heat dissipation is driven not solely by a temperature gradient but also by other vector forces. In the ca... |
0904.3406 | Roberto Casadio | Roberto Casadio, Remo Garattini, Fabio Scardigli | Point-like sources and the scale of quantum gravity | 5 pages, 3 figures, revtex4 style | Phys.Lett.B679:156-159,2009 | 10.1016/j.physletb.2009.06.076 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the General Relativistic model of a (quasi) point-like particle
represented by a massive shell of neutral matter which has vanishing total
energy in the small-volume limit. We then show that, by assuming a Generalised
Uncertainty Principle, which implies the existence of a minimum length of the
order of the... | [
{
"created": "Wed, 22 Apr 2009 09:02:49 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Casadio",
"Roberto",
""
],
[
"Garattini",
"Remo",
""
],
[
"Scardigli",
"Fabio",
""
]
] | We review the General Relativistic model of a (quasi) point-like particle represented by a massive shell of neutral matter which has vanishing total energy in the small-volume limit. We then show that, by assuming a Generalised Uncertainty Principle, which implies the existence of a minimum length of the order of the P... |
gr-qc/0506110 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia, Michele Arzano, Yi Ling, Gianluca Mandanici | Black-hole thermodynamics with modified dispersion relations and
generalized uncertainty principles | 20 pages, LaTex | Class.Quant.Grav. 23 (2006) 2585-2606 | 10.1088/0264-9381/23/7/022 | null | gr-qc | null | In several approaches to the quantum-gravity problem evidence has emerged of
the validity of a "GUP" (a Generalized position-momentum Uncertainty Principle)
and/or a "MDR" (a modification of the energy-momentum dispersion relation), but
very little is known about the implications of GUPs and MDRs for black-hole
therm... | [
{
"created": "Wed, 22 Jun 2005 21:49:18 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Amelino-Camelia",
"Giovanni",
""
],
[
"Arzano",
"Michele",
""
],
[
"Ling",
"Yi",
""
],
[
"Mandanici",
"Gianluca",
""
]
] | In several approaches to the quantum-gravity problem evidence has emerged of the validity of a "GUP" (a Generalized position-momentum Uncertainty Principle) and/or a "MDR" (a modification of the energy-momentum dispersion relation), but very little is known about the implications of GUPs and MDRs for black-hole thermod... |
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