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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0712.1263 | Kostas Kokkotas D | M. Vavoulidis, K. D. Kokkotas, A. Stavridis | Crustal Oscillations of Slowly Rotating Relativistic Stars | 15 pages | Mon.Not.Roy.Astron.Soc.384:1711,2008. | 10.1111/j.1365-2966.2007.12835.x | null | gr-qc astro-ph | null | We study low-amplitude crustal oscillations of slowly rotating relativistic
stars consisting of a central fluid core and an outer thin solid crust. We
estimate the effect of rotation on the torsional toroidal modes and on the
interfacial and shear spheroidal modes. The results compared against the
Newtonian ones for ... | [
{
"created": "Sat, 8 Dec 2007 07:23:14 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Vavoulidis",
"M.",
""
],
[
"Kokkotas",
"K. D.",
""
],
[
"Stavridis",
"A.",
""
]
] | We study low-amplitude crustal oscillations of slowly rotating relativistic stars consisting of a central fluid core and an outer thin solid crust. We estimate the effect of rotation on the torsional toroidal modes and on the interfacial and shear spheroidal modes. The results compared against the Newtonian ones for wi... |
2005.14678 | Mikael Normann | Mikael Normann and Juan Valiente Kroon | Evolution equations for a wide range of Einstein-matter systems | null | null | 10.1007/s10714-020-02759-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use an orthonormal frame approach to provide a general framework for the
first order hyperbolic reduction of the Einstein equations coupled to a fairly
generic class of matter models. Our analysis covers the special cases of dust
and perfect fluid. We also provide a discussion of self-gravitating elastic
matter. T... | [
{
"created": "Fri, 29 May 2020 17:04:46 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Normann",
"Mikael",
""
],
[
"Kroon",
"Juan Valiente",
""
]
] | We use an orthonormal frame approach to provide a general framework for the first order hyperbolic reduction of the Einstein equations coupled to a fairly generic class of matter models. Our analysis covers the special cases of dust and perfect fluid. We also provide a discussion of self-gravitating elastic matter. The... |
0901.2944 | Narit Pidokrajt | Jan E. Aman, Narit Pidokrajt, John Ward | Information geometry of asymptotically AdS black holes | Contribution to proceedings of ERE2008, 4 pages | AIP Conf. Proc.1122:181-184, 2009 | 10.1063/1.3141246 | UVIC-TH-09-02 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate thermodynamic geometries of two families of asymptotically
Anti-de Sitter black holes, i.e. the Reissner-Nordstr\"om Anti-de Sitter in
four dimensions and the BTZ black hole. It is found that the Anti-de Sitter
space renders the geometry nontrivial (c.f. the Reissner-Nordstr\"om black hole
in asymptoti... | [
{
"created": "Mon, 19 Jan 2009 22:14:13 GMT",
"version": "v1"
}
] | 2009-05-15 | [
[
"Aman",
"Jan E.",
""
],
[
"Pidokrajt",
"Narit",
""
],
[
"Ward",
"John",
""
]
] | We investigate thermodynamic geometries of two families of asymptotically Anti-de Sitter black holes, i.e. the Reissner-Nordstr\"om Anti-de Sitter in four dimensions and the BTZ black hole. It is found that the Anti-de Sitter space renders the geometry nontrivial (c.f. the Reissner-Nordstr\"om black hole in asymptotica... |
gr-qc/0611114 | H Mohseni Sadjadi | H. Mohseni Sadjadi | Schwarzschild black hole and the generalized second law in
phantom-dominated universe | 10 pages, references added, typos corrected, accepted for publication
in Physics Letters B | Phys.Lett.B645:108-112,2007 | 10.1016/j.physletb.2006.12.029 | null | gr-qc astro-ph | null | We study the conditions required for validity of the generalized second law
in phantom dominated universe in the presence of Schwarzschild black hole. Our
study is independent of the origin of the phantom like behavior of the
considered universe. We also discuss the generalized second law in the
neighborhood of trans... | [
{
"created": "Wed, 22 Nov 2006 10:04:10 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2006 14:28:38 GMT",
"version": "v2"
},
{
"created": "Sat, 16 Dec 2006 11:05:04 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Sadjadi",
"H. Mohseni",
""
]
] | We study the conditions required for validity of the generalized second law in phantom dominated universe in the presence of Schwarzschild black hole. Our study is independent of the origin of the phantom like behavior of the considered universe. We also discuss the generalized second law in the neighborhood of transit... |
2203.01814 | Yang Liu | Yang Liu | The spectrum of Hawking radiation in Tsallis statistical mechanics | null | null | 10.1140/epjc/s10052-022-10744-9 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Hawking radiation is one of the cores in modern gratitational theory. Several
articles have calculated the spectrum of Hawking radiation in Boltzmann-Gibbs
statistical mechanics. However, based on recent researches, gravitational
systems cannot be studied by the standard statistical mechanics. In this
article, we cal... | [
{
"created": "Wed, 2 Mar 2022 00:42:29 GMT",
"version": "v1"
}
] | 2022-09-14 | [
[
"Liu",
"Yang",
""
]
] | Hawking radiation is one of the cores in modern gratitational theory. Several articles have calculated the spectrum of Hawking radiation in Boltzmann-Gibbs statistical mechanics. However, based on recent researches, gravitational systems cannot be studied by the standard statistical mechanics. In this article, we calcu... |
1906.08228 | Marco Astorino | Marco Astorino | Enhanced Ehlers Transformation and the Majumdar-Papapetrou-NUT Spacetime | v1: 28 pages. v2: 32 pages, typos corrected, references added,
extended version, a relation between the gravitomagnetic duality and the
enhanced Ehlers transformation is discussed; v3: 34 pages, final version, to
appear in JHEP | JHEP 01 (2020) 123 | 10.1007/JHEP01(2020)123 | IFUM-1080-FT | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The transformation which adds (or removes) NUT charge when it is applied to
electrovacuum, axisymmetric and stationary space-times is studied. After
analysing the Ehlers and the Reina-Treves transformations we propose a new one,
more precise in the presence of the Maxwell electromagnetic field. The enhanced
Ehlers tr... | [
{
"created": "Wed, 19 Jun 2019 17:17:16 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Nov 2019 16:34:11 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Jan 2020 19:24:52 GMT",
"version": "v3"
}
] | 2020-01-23 | [
[
"Astorino",
"Marco",
""
]
] | The transformation which adds (or removes) NUT charge when it is applied to electrovacuum, axisymmetric and stationary space-times is studied. After analysing the Ehlers and the Reina-Treves transformations we propose a new one, more precise in the presence of the Maxwell electromagnetic field. The enhanced Ehlers tran... |
0706.1360 | Masoud Alimohammadi | Masoud Alimohammadi | Asymptotic behavior of w in general quintom model | 8 pages, one example is added, accepted for publication in Gen. Rel.
Grav | Gen.Rel.Grav.40:107-115,2008 | 10.1007/s10714-007-0514-3 | null | gr-qc astro-ph hep-th | null | For the quintom models with arbitrary potential $V=V(\phi,\sigma)$, the
asymptotic value of equation of state parameter w is obtained by a new method.
In this method, w of stable attractors are calculated by using the ratio (d ln
V)/(d ln a) in asymptotic region. All the known results, have been obtained by
other met... | [
{
"created": "Sun, 10 Jun 2007 14:40:33 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Aug 2007 21:56:27 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Oct 2007 09:02:12 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Alimohammadi",
"Masoud",
""
]
] | For the quintom models with arbitrary potential $V=V(\phi,\sigma)$, the asymptotic value of equation of state parameter w is obtained by a new method. In this method, w of stable attractors are calculated by using the ratio (d ln V)/(d ln a) in asymptotic region. All the known results, have been obtained by other metho... |
1209.4539 | Frank Hellmann | Bianca Dittrich, Frank Hellmann, Wojciech Kaminski | Holonomy Spin Foam Models: Boundary Hilbert spaces and Time Evolution
Operators | 51 pages, 18 figures | null | 10.1088/0264-9381/30/8/085005 | null | gr-qc hep-lat | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this and the companion paper a novel holonomy formulation of so called
Spin Foam models of lattice gauge gravity are explored. After giving a natural
basis for the space of simplicity constraints we define a universal boundary
Hilbert space, on which the imposition of different forms of the simplicity
constraints ... | [
{
"created": "Thu, 20 Sep 2012 14:12:10 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Dittrich",
"Bianca",
""
],
[
"Hellmann",
"Frank",
""
],
[
"Kaminski",
"Wojciech",
""
]
] | In this and the companion paper a novel holonomy formulation of so called Spin Foam models of lattice gauge gravity are explored. After giving a natural basis for the space of simplicity constraints we define a universal boundary Hilbert space, on which the imposition of different forms of the simplicity constraints ca... |
1509.05835 | Mauricio Bellini | Mauricio Bellini (IFIMAR - CONICET & UNMdP) | Inflationary back-reaction effects from Relativistic Quantum Geometry | Accepted in Physics of the Dark Universe | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of scalar metric fluctuations in a non-perturbative
variational formalism recently introduced, by which the dynamics of an
geometrical scalar field $\theta$, describes the quantum geometrical effects on
a Weylian-like manifold with respect to a background Riemannian space-time. In
this letter we... | [
{
"created": "Sat, 19 Sep 2015 00:44:12 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Dec 2015 14:59:49 GMT",
"version": "v2"
}
] | 2015-12-15 | [
[
"Bellini",
"Mauricio",
"",
"IFIMAR - CONICET & UNMdP"
]
] | We study the dynamics of scalar metric fluctuations in a non-perturbative variational formalism recently introduced, by which the dynamics of an geometrical scalar field $\theta$, describes the quantum geometrical effects on a Weylian-like manifold with respect to a background Riemannian space-time. In this letter we h... |
gr-qc/0301028 | Brien C. Nolan | Brien C. Nolan | Dynamical extensions for shell-crossing singularities | 14 pages, 1 figure | Class.Quant.Grav. 20 (2003) 575-586 | 10.1088/0264-9381/20/4/302 | null | gr-qc | null | We derive global weak solutions of Einstein's equations for spherically
symmetric dust-filled space-times which admit shell-crossing singularities. In
the marginally bound case, the solutions are weak solutions of a conservation
law. In the non-marginally bound case, the equations are solved in a
generalized sense in... | [
{
"created": "Wed, 8 Jan 2003 18:02:22 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Nolan",
"Brien C.",
""
]
] | We derive global weak solutions of Einstein's equations for spherically symmetric dust-filled space-times which admit shell-crossing singularities. In the marginally bound case, the solutions are weak solutions of a conservation law. In the non-marginally bound case, the equations are solved in a generalized sense invo... |
1611.05062 | James Edholm | James Edholm | UV completion of the Starobinsky model, tensor-to-scalar ratio, and
constraints on non-locality | 7 pages, 1 figure | Phys. Rev. D 95, 044004 (2017) | 10.1103/PhysRevD.95.044004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we build upon the successes of the ultraviolet (UV) completion
of the Starobinsky model of inflation. This involves an extension of the
Einstein-Hilbert term by an infinite covariant derivative theory of gravity,
which is quadratic in curvature. It has been shown that such a theory can
potentially reso... | [
{
"created": "Tue, 15 Nov 2016 21:20:13 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Aug 2017 11:27:25 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Nov 2017 09:04:50 GMT",
"version": "v3"
}
] | 2017-11-15 | [
[
"Edholm",
"James",
""
]
] | In this paper, we build upon the successes of the ultraviolet (UV) completion of the Starobinsky model of inflation. This involves an extension of the Einstein-Hilbert term by an infinite covariant derivative theory of gravity, which is quadratic in curvature. It has been shown that such a theory can potentially resolv... |
1407.0319 | Tapobrata Sarkar | Dipanjan Dey, Kaushik Bhattacharya, Tapobrata Sarkar | Galactic space-times in modified theories of gravity | 1 + 29 Pages, LaTeX, 12 .eps figures. Some discussions improved.
Published version | null | 10.1007/s10714-015-1945-x | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Bertrand space-times (BSTs), which have been proposed as viable
models of space-times seeded by galactic dark matter, in modified theories of
gravity. We first critically examine the issue of galactic rotation curves in
General Relativity, and establish the usefulness of BSTs to fit experimental
data in this... | [
{
"created": "Tue, 1 Jul 2014 16:55:32 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Aug 2015 07:47:04 GMT",
"version": "v2"
}
] | 2015-08-25 | [
[
"Dey",
"Dipanjan",
""
],
[
"Bhattacharya",
"Kaushik",
""
],
[
"Sarkar",
"Tapobrata",
""
]
] | We study Bertrand space-times (BSTs), which have been proposed as viable models of space-times seeded by galactic dark matter, in modified theories of gravity. We first critically examine the issue of galactic rotation curves in General Relativity, and establish the usefulness of BSTs to fit experimental data in this c... |
gr-qc/0607070 | Horst R. Beyer | Horst R. Beyer, Irina Holmes | On a new symmetry of the solutions of the wave equation in the
background of a Kerr black hole | null | Class.Quant.Grav.25:135014,2008 | 10.1088/0264-9381/25/13/135014 | null | gr-qc astro-ph hep-th math-ph math.MP | null | This short paper derives the constant of motion of a scalar field in the
gravitational field of a Kerr black hole which is associated to a Killing
tensor of that space-time. In addition, there is found a related new symmetry
operator S for the solutions of the wave equation in that background. That
operator is a part... | [
{
"created": "Tue, 18 Jul 2006 13:57:38 GMT",
"version": "v1"
}
] | 2012-09-21 | [
[
"Beyer",
"Horst R.",
""
],
[
"Holmes",
"Irina",
""
]
] | This short paper derives the constant of motion of a scalar field in the gravitational field of a Kerr black hole which is associated to a Killing tensor of that space-time. In addition, there is found a related new symmetry operator S for the solutions of the wave equation in that background. That operator is a partia... |
2404.15450 | Wei-Chen Lin | Pisin Chen, Kuan-Nan Lin, Wei-Chen Lin, Dong-han Yeom | A possible origin of the $\alpha$-vacuum as the initial state of the
Universe | 25 pages, 8 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the cosmological observables using the Euclidean path integral
approach. Specifically, we study both the no-boundary compact instantons
scenario and the Euclidean wormholes scenario that can induce the creation of
two universes from nothing. It is known that perturbations associated with the
no-boundar... | [
{
"created": "Tue, 23 Apr 2024 18:43:29 GMT",
"version": "v1"
}
] | 2024-04-25 | [
[
"Chen",
"Pisin",
""
],
[
"Lin",
"Kuan-Nan",
""
],
[
"Lin",
"Wei-Chen",
""
],
[
"Yeom",
"Dong-han",
""
]
] | We investigate the cosmological observables using the Euclidean path integral approach. Specifically, we study both the no-boundary compact instantons scenario and the Euclidean wormholes scenario that can induce the creation of two universes from nothing. It is known that perturbations associated with the no-boundary ... |
2302.04285 | Adri\`a Delhom | Adri\`a Delhom, Gonzalo J. Olmo, and Parampreet Singh | A diffeomorphism invariant family of metric-affine actions for loop
cosmologies | 19 pages, 4 figures and 3 tables | JCAP06(2023)059 | 10.1088/1475-7516/2023/06/059 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In loop quantum cosmology (LQC) the big bang singularity is generically
resolved by a big bounce. This feature holds even when modified quantization
prescriptions of the Hamiltonian constraint are used such as in mLQC-I and
mLQC-II. While the later describes an effective description qualitatively
similar to that of s... | [
{
"created": "Wed, 8 Feb 2023 19:01:03 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Jun 2023 13:09:18 GMT",
"version": "v2"
}
] | 2023-06-30 | [
[
"Delhom",
"Adrià",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Singh",
"Parampreet",
""
]
] | In loop quantum cosmology (LQC) the big bang singularity is generically resolved by a big bounce. This feature holds even when modified quantization prescriptions of the Hamiltonian constraint are used such as in mLQC-I and mLQC-II. While the later describes an effective description qualitatively similar to that of sta... |
1712.09966 | Julian Westerweck | Julian Westerweck, Alex B. Nielsen, Ofek Fischer-Birnholtz, Miriam
Cabero, Collin Capano, Thomas Dent, Badri Krishnan, Grant Meadors and
Alexander H. Nitz | Low significance of evidence for black hole echoes in gravitational wave
data | As accepted by Physical Review D | Phys. Rev. D 97, 124037 (2018) | 10.1103/PhysRevD.97.124037 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent detections of merging black holes allow observational tests of the
nature of these objects. In some proposed models, non-trivial structure at or
near the black hole horizon could lead to echo signals in gravitational wave
data. Recently, Abedi et al. claimed tentative evidence for repeating damped
echo signals... | [
{
"created": "Thu, 28 Dec 2017 18:22:38 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Feb 2018 17:38:52 GMT",
"version": "v2"
},
{
"created": "Wed, 16 May 2018 16:37:55 GMT",
"version": "v3"
}
] | 2018-06-20 | [
[
"Westerweck",
"Julian",
""
],
[
"Nielsen",
"Alex B.",
""
],
[
"Fischer-Birnholtz",
"Ofek",
""
],
[
"Cabero",
"Miriam",
""
],
[
"Capano",
"Collin",
""
],
[
"Dent",
"Thomas",
""
],
[
"Krishnan",
"Badri",
""
... | Recent detections of merging black holes allow observational tests of the nature of these objects. In some proposed models, non-trivial structure at or near the black hole horizon could lead to echo signals in gravitational wave data. Recently, Abedi et al. claimed tentative evidence for repeating damped echo signals f... |
0910.1112 | Kamal Nandi | Amrita Bhattacharya, Ruslan Isaev, Massimo Scalia, Carlo Cattani, and
Kamal K. Nandi | Light bending in the galactic halo by Rindler-Ishak method | 15 pages | JCAP 1009:004,2010 | 10.1088/1475-7516/2010/09/004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After the work of Rindler and Ishak, it is now well established that the
bending of light is influenced by the cosmological constant {\Lambda} appearing
in the Schwarzschild-de Sitter spacetime. We show that their method, when
applied to the galactic halo gravity parametrized by a constant {\gamma},
yields exactly th... | [
{
"created": "Tue, 6 Oct 2009 20:57:07 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jan 2010 17:44:39 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Apr 2010 06:47:32 GMT",
"version": "v3"
},
{
"created": "Sat, 10 Jul 2010 18:40:10 GMT",
"version": "v4"
},
{
"cr... | 2011-03-14 | [
[
"Bhattacharya",
"Amrita",
""
],
[
"Isaev",
"Ruslan",
""
],
[
"Scalia",
"Massimo",
""
],
[
"Cattani",
"Carlo",
""
],
[
"Nandi",
"Kamal K.",
""
]
] | After the work of Rindler and Ishak, it is now well established that the bending of light is influenced by the cosmological constant {\Lambda} appearing in the Schwarzschild-de Sitter spacetime. We show that their method, when applied to the galactic halo gravity parametrized by a constant {\gamma}, yields exactly the ... |
2011.05109 | Behnam Pourhassan | Jafar Sadeghi, Saeed Noori Gashti, Izzet Sakalli and Behnam Pourhassan | Weak Gravity Conjecture of Charged-Rotating-AdS Black Hole Surrounded by
Quintessence and String Cloud | 22 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A series of corrections to general relativity have recently been applied to
find the relationship between entropy and extremality-bound black holes. This
relationship has been investigated for many black holes, such as charged AdS,
rotating, and massive gravity black holes. We give a minor constant correction
to the ... | [
{
"created": "Tue, 10 Nov 2020 14:15:59 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Feb 2021 01:19:33 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Apr 2022 16:49:19 GMT",
"version": "v3"
},
{
"created": "Thu, 26 May 2022 19:58:24 GMT",
"version": "v4"
},
{
"cr... | 2022-08-03 | [
[
"Sadeghi",
"Jafar",
""
],
[
"Gashti",
"Saeed Noori",
""
],
[
"Sakalli",
"Izzet",
""
],
[
"Pourhassan",
"Behnam",
""
]
] | A series of corrections to general relativity have recently been applied to find the relationship between entropy and extremality-bound black holes. This relationship has been investigated for many black holes, such as charged AdS, rotating, and massive gravity black holes. We give a minor constant correction to the ac... |
1611.01118 | Leszek Soko{\l}owski | Leszek M. Sokolowski | The bizarre anti-de Sitter spacetime | 31 pages, 3 figures | International Journal of Geometric Methods in Modern Physics 13
no.9 (2016) 1630016 | 10.1142/S0219887816300166 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Anti--de Sitter spacetime is important in general relativity and modern field
theory. We review its geometrical features and properties of light signals and
free particles moving in it. Applying only elementary tools of tensor calculus
we derive \textit{ab initio\/} all these properties and show that they are
really ... | [
{
"created": "Thu, 3 Nov 2016 18:17:12 GMT",
"version": "v1"
}
] | 2016-11-04 | [
[
"Sokolowski",
"Leszek M.",
""
]
] | Anti--de Sitter spacetime is important in general relativity and modern field theory. We review its geometrical features and properties of light signals and free particles moving in it. Applying only elementary tools of tensor calculus we derive \textit{ab initio\/} all these properties and show that they are really we... |
0705.0235 | Eyo Ita III | Eyo Eyo Ita III | Instanton representation of Plebanski gravity: Application to the
Schwarzchild metric | 22 pages. Background material for revised journal article | The Abraham Zelmanov Journal, 2011, Vol. 4 (pages 72-95) | null | DAMTP-2007-39 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we apply the instanton representation method to the
construction of spherically symmetric blackhole general relativity solutions.
The instanton representation implies the existence of additional Type D
solutions which are axially symmetric. We explicitly construct these solutions,
which are fully consis... | [
{
"created": "Wed, 2 May 2007 09:33:14 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Apr 2010 18:13:51 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Mar 2011 02:46:14 GMT",
"version": "v3"
}
] | 2012-02-20 | [
[
"Ita",
"Eyo Eyo",
"III"
]
] | In this paper we apply the instanton representation method to the construction of spherically symmetric blackhole general relativity solutions. The instanton representation implies the existence of additional Type D solutions which are axially symmetric. We explicitly construct these solutions, which are fully consiste... |
2102.01123 | Vittorio De Falco Dr | Vittorio De Falco, Emmanuele Battista, Salvatore Capozziello,
Mariafelicia De Laurentis | Reconstructing wormhole solutions in curvature based Extended Theories
of Gravity | 9 pages; 2 figures; 1 Table; accepted on EPJ C | Eur. Phys. J. C 81, 157 (2021) | 10.1140/epjc/s10052-021-08958-4 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | Static and spherically symmetric wormhole solutions can be reconstructed in
the framework of curvature based Extended Theories of Gravity. In particular,
extensions of the General Relativity, in metric and curvature formalism give
rise to modified gravitational potentials, constituted by the classical
Newtonian poten... | [
{
"created": "Mon, 1 Feb 2021 19:36:55 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Feb 2021 13:19:12 GMT",
"version": "v2"
}
] | 2021-02-23 | [
[
"De Falco",
"Vittorio",
""
],
[
"Battista",
"Emmanuele",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"De Laurentis",
"Mariafelicia",
""
]
] | Static and spherically symmetric wormhole solutions can be reconstructed in the framework of curvature based Extended Theories of Gravity. In particular, extensions of the General Relativity, in metric and curvature formalism give rise to modified gravitational potentials, constituted by the classical Newtonian potenti... |
1207.3922 | Luca Parisi Ph.D. | Luca Parisi, Ninfa Radicella and Gaetano Vilasi | On the stability of the Einstein Static Universe in Massive Gravity | 7 pages, 7 figures, 1 table, minor changes, references added | Phys. Rev. D 86, 024035 (2012) | 10.1103/PhysRevD.86.024035 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider static cosmological solutions along with their stability
properties in the framework of a recently proposed theory of massive gravity.
We show that the modifcation introduced in the cosmological equations leads to
several new solutions, only sourced by a perfect fluid, generalizing the
Einstein Static Uni... | [
{
"created": "Tue, 17 Jul 2012 09:07:16 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2012 08:06:09 GMT",
"version": "v2"
}
] | 2012-07-27 | [
[
"Parisi",
"Luca",
""
],
[
"Radicella",
"Ninfa",
""
],
[
"Vilasi",
"Gaetano",
""
]
] | We consider static cosmological solutions along with their stability properties in the framework of a recently proposed theory of massive gravity. We show that the modifcation introduced in the cosmological equations leads to several new solutions, only sourced by a perfect fluid, generalizing the Einstein Static Unive... |
2402.07416 | Alfio Bonanno | Alfio Bonanno, Amir-Pouyan Khosravi, Frank Saueressig | Reply to "Comment" on "Regular evaporating black holes with stable
cores" | 3 pages, 1 figure | Phys.Rev.D 108 (2023) 12, 128502 | 10.1103/PhysRevD.108.128502 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We reply to the ``Comment'' on ``Regular evaporating black holes with stable
cores'' by R. Carballo-Rubio, F. Di Filippo, S. Liberati, C. Pacilio, and M.
Visser. As a key result, we show that the regime of mass-inflation identified
in the comment connects smoothly to the late-time attractors discovered in our
works [... | [
{
"created": "Mon, 12 Feb 2024 05:38:46 GMT",
"version": "v1"
}
] | 2024-02-13 | [
[
"Bonanno",
"Alfio",
""
],
[
"Khosravi",
"Amir-Pouyan",
""
],
[
"Saueressig",
"Frank",
""
]
] | We reply to the ``Comment'' on ``Regular evaporating black holes with stable cores'' by R. Carballo-Rubio, F. Di Filippo, S. Liberati, C. Pacilio, and M. Visser. As a key result, we show that the regime of mass-inflation identified in the comment connects smoothly to the late-time attractors discovered in our works [A.... |
2310.18962 | Cosimo Bambi | Shuaitongze Zhao, Shafqat Riaz, Cosimo Bambi | About the ability of agnostic X-ray tests of the Kerr Hypothesis to
discover new physics | 12 pages, 5 figures. v2: refereed version | Phys. Rev. D 109, 064059 (2024) | 10.1103/PhysRevD.109.064059 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the past decade, we have seen an unprecedented progress in our ability of
testing general relativity in the strong field regime with black hole
observations. Most studies have focused on the so-called tests of the Kerr
hypothesis: they have tried to verify whether the spacetime geometry around
black holes is descr... | [
{
"created": "Sun, 29 Oct 2023 10:05:08 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Mar 2024 21:42:51 GMT",
"version": "v2"
}
] | 2024-03-21 | [
[
"Zhao",
"Shuaitongze",
""
],
[
"Riaz",
"Shafqat",
""
],
[
"Bambi",
"Cosimo",
""
]
] | In the past decade, we have seen an unprecedented progress in our ability of testing general relativity in the strong field regime with black hole observations. Most studies have focused on the so-called tests of the Kerr hypothesis: they have tried to verify whether the spacetime geometry around black holes is describ... |
2111.06442 | Alexandre Pombo | Carlos A. R. Herdeiro, Alexandre M. Pombo and Eugen Radu | Aspects of Gauss-Bonnet scalarisation of charged black holes | 16 pages, 6 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The general relativity vacuum black holes (BHs) can be scalarised in models
where a scalar field non-minimally couples to the Gauss-Bonnet (GB) invariant.
Such GB scalarisation comes in two flavours, depending on the GB sign that
triggers the phenomenon. Hereafter these two cases are termed GB$^\pm$
scalarisation. Fo... | [
{
"created": "Thu, 11 Nov 2021 19:58:20 GMT",
"version": "v1"
}
] | 2021-11-15 | [
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Pombo",
"Alexandre M.",
""
],
[
"Radu",
"Eugen",
""
]
] | The general relativity vacuum black holes (BHs) can be scalarised in models where a scalar field non-minimally couples to the Gauss-Bonnet (GB) invariant. Such GB scalarisation comes in two flavours, depending on the GB sign that triggers the phenomenon. Hereafter these two cases are termed GB$^\pm$ scalarisation. For ... |
gr-qc/9805082 | Jose Navarro Salas | A. Fabbri and J. Navarro-Salas | Critical energy flux and mass in solvable theories of 2d dilaton gravity | LaTeX file, 12 pages, 4 figures | Phys.Rev. D58 (1998) 084011 | 10.1103/PhysRevD.58.084011 | null | gr-qc hep-th | null | In this paper we address the issue of determining the semiclassical threshold
for black hole formation in the context of a one-parameter family of theories
which continuously interpolates between the RST and BPP models. We find that
the results depend significantly on the initial static configuration of the
spacetime... | [
{
"created": "Thu, 21 May 1998 08:43:42 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Fabbri",
"A.",
""
],
[
"Navarro-Salas",
"J.",
""
]
] | In this paper we address the issue of determining the semiclassical threshold for black hole formation in the context of a one-parameter family of theories which continuously interpolates between the RST and BPP models. We find that the results depend significantly on the initial static configuration of the spacetime g... |
0901.4818 | Sergei Kopeikin | Sergei Kopeikin (University of Missouri-Columbia) | On the two approaches to the data analysis of the Cassini interplanetary
relativity experiment | 6 pages, no figures. Accepted for publication to Physics Letters A | Physics Letters A, Vol. 373, pp. 2605--2607 (2009) | 10.1016/j.physleta.2009.05.058 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare two theoretical approaches to the data analysis of the Cassini
relativity experiment based on the Doppler tracking and the time delay
technique that were published correspondingly by Kopeikin et al in Phys. Lett.
A 367, 276 (2007) and by Bertotti et al in Class. Quant. Grav. 25, 045013
(2008). Bertotti et ... | [
{
"created": "Fri, 30 Jan 2009 02:26:37 GMT",
"version": "v1"
},
{
"created": "Wed, 13 May 2009 00:55:38 GMT",
"version": "v2"
}
] | 2009-07-10 | [
[
"Kopeikin",
"Sergei",
"",
"University of Missouri-Columbia"
]
] | We compare two theoretical approaches to the data analysis of the Cassini relativity experiment based on the Doppler tracking and the time delay technique that were published correspondingly by Kopeikin et al in Phys. Lett. A 367, 276 (2007) and by Bertotti et al in Class. Quant. Grav. 25, 045013 (2008). Bertotti et al... |
2309.16379 | Yongqiang Wang | Chen-Hao Hao, Shi-Xian Sun, Long-Xing Huang, Rong Zhang, Xin Su,
Yong-Qiang Wang | Emergency of black holes from wormholes | 32 pages, 23 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the spherically symmetric Dirac star model in the
presence of a phantom field, obtaining a traversable wormhole solution in
non-trivial topological spacetime. This solution exhibits asymmetry in both the
field configuration and the metric and possesses a finite ADM mass $M$ and
Noether charge ... | [
{
"created": "Thu, 28 Sep 2023 12:28:02 GMT",
"version": "v1"
}
] | 2023-09-29 | [
[
"Hao",
"Chen-Hao",
""
],
[
"Sun",
"Shi-Xian",
""
],
[
"Huang",
"Long-Xing",
""
],
[
"Zhang",
"Rong",
""
],
[
"Su",
"Xin",
""
],
[
"Wang",
"Yong-Qiang",
""
]
] | In this paper, we study the spherically symmetric Dirac star model in the presence of a phantom field, obtaining a traversable wormhole solution in non-trivial topological spacetime. This solution exhibits asymmetry in both the field configuration and the metric and possesses a finite ADM mass $M$ and Noether charge $Q... |
1508.04331 | Xin Li | Xin Li and Sai Wang | Primordial power spectrum of tensor perturbations in Finsler spacetime | 15 pages, 12 fugures. arXiv admin note: text overlap with
arXiv:1502.02256 | null | 10.1140/epjc/s10052-016-3890-6 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We first investigate the gravitational wave in the flat Finsler spacetime. In
the Finslerian universe, we derive the perturbed gravitational field equation
with tensor perturbations. The Finslerian background spacetime breaks
rotational symmetry and induces parity violation. Then we obtain the modified
primordial pow... | [
{
"created": "Sun, 16 Aug 2015 16:25:22 GMT",
"version": "v1"
}
] | 2016-03-23 | [
[
"Li",
"Xin",
""
],
[
"Wang",
"Sai",
""
]
] | We first investigate the gravitational wave in the flat Finsler spacetime. In the Finslerian universe, we derive the perturbed gravitational field equation with tensor perturbations. The Finslerian background spacetime breaks rotational symmetry and induces parity violation. Then we obtain the modified primordial power... |
1703.10871 | Lucas Torres Santana | Lucas T. Santana, Maur\'icio O. Calv\~ao, Ribamar R. R. Reis, Beatriz
B. Siffert | How does light move in a generic metric-affine background? | 6 pages, 1 figure | Physical Review D 95, 061501(R) (2017) | 10.1103/PhysRevD.95.061501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Light is the richest information retriever for most physical systems,
particularly so for astronomy and cosmology, in which gravitation is of
paramount importance, and also for solid state defects and metamaterials, in
which some effects can be mimicked by non-Euclidean or even non-Riemannian
geometries. Thus, it is ... | [
{
"created": "Fri, 31 Mar 2017 12:03:25 GMT",
"version": "v1"
}
] | 2017-04-03 | [
[
"Santana",
"Lucas T.",
""
],
[
"Calvão",
"Maurício O.",
""
],
[
"Reis",
"Ribamar R. R.",
""
],
[
"Siffert",
"Beatriz B.",
""
]
] | Light is the richest information retriever for most physical systems, particularly so for astronomy and cosmology, in which gravitation is of paramount importance, and also for solid state defects and metamaterials, in which some effects can be mimicked by non-Euclidean or even non-Riemannian geometries. Thus, it is ex... |
gr-qc/0506026 | Larry Ford | L.H. Ford and Thomas A. Roman | Minkowski Vacuum Stress Tensor Fluctuations | 24 pages, 5 figures; Some additional comments added in Sect. IIB and
a more compact argument given in App. C | Phys.Rev. D72 (2005) 105010 | 10.1103/PhysRevD.72.105010 | null | gr-qc hep-th quant-ph | null | We study the fluctuations of the stress tensor for a massless scalar field in
two and four-dimensional Minkowski spacetime in the vacuum state. Covariant
expressions for the stress tensor correlation function are obtained as sums of
derivatives of a scalar function. These expressions allow one to express
spacetime av... | [
{
"created": "Mon, 6 Jun 2005 00:31:15 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Oct 2005 15:21:56 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Oct 2005 18:31:43 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Ford",
"L. H.",
""
],
[
"Roman",
"Thomas A.",
""
]
] | We study the fluctuations of the stress tensor for a massless scalar field in two and four-dimensional Minkowski spacetime in the vacuum state. Covariant expressions for the stress tensor correlation function are obtained as sums of derivatives of a scalar function. These expressions allow one to express spacetime aver... |
1811.08538 | Sumanta Chakraborty | Mostafizur Rahman, Sumanta Chakraborty, Soumitra SenGupta and Anjan A.
Sen | Fate of Strong Cosmic Censorship Conjecture in Presence of Higher
Spacetime Dimensions | v3, 35 pages, 7 figures, Accepted in JHEP | JHEP 1903, 178 (2019) | 10.1007/JHEP03(2019)178 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Strong cosmic censorship conjecture has been one of the most important leap
of faith in the context of general relativity, providing assurance in the
deterministic nature of the associated field equations. Though it holds well
for asymptotically flat spacetimes, a potential failure of the strong cosmic
censorship con... | [
{
"created": "Wed, 21 Nov 2018 01:14:01 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Feb 2019 13:25:39 GMT",
"version": "v2"
},
{
"created": "Wed, 20 Mar 2019 01:39:11 GMT",
"version": "v3"
}
] | 2019-03-28 | [
[
"Rahman",
"Mostafizur",
""
],
[
"Chakraborty",
"Sumanta",
""
],
[
"SenGupta",
"Soumitra",
""
],
[
"Sen",
"Anjan A.",
""
]
] | Strong cosmic censorship conjecture has been one of the most important leap of faith in the context of general relativity, providing assurance in the deterministic nature of the associated field equations. Though it holds well for asymptotically flat spacetimes, a potential failure of the strong cosmic censorship conje... |
gr-qc/0201008 | Janusz Garecki | Janusz Garecki | A Possible Test for Quadratic Gravity in $d \ge 4$ dimensions | 11 pages, no figures, REVTEX | null | 10.1016/S0034-4877(03)80013-7 | null | gr-qc | null | In this letter we consider the Einsteinian strengths and dynamical degrees of
freedom for quadratic gravity. We show that purely metric quadratic gravity
theories are much stronger in Einsteinian sense than the competitive quadratic
gravity theories which admit torsion.
| [
{
"created": "Thu, 3 Jan 2002 16:54:00 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Garecki",
"Janusz",
""
]
] | In this letter we consider the Einsteinian strengths and dynamical degrees of freedom for quadratic gravity. We show that purely metric quadratic gravity theories are much stronger in Einsteinian sense than the competitive quadratic gravity theories which admit torsion. |
0909.2562 | Lorenzo Iorio | Lorenzo Iorio, Matteo Luca Ruggiero | Phenomenological constraints on the Kehagias-Sfetsos solution in the
Horava-Lifshitz gravity from solar system orbital motions | LaTex2e, 10 pages, no figures, 5 tables, 26 references. References
updated. To appear in International Journal of Modern Physics A (IJMPA) | Int.J.Mod.Phys.A25:5399-5408,2010 | 10.1142/S0217751X10050780 | null | gr-qc astro-ph.EP hep-ph physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We focus on Horava-Lifshitz (HL) theory of gravity, and, in particular, on
the Kehagias and Sfetsos s solution that is the analog of Schwarzschild black
hole of General Relativity. In the weak-field and slow-motion approximation we
analytically work out the secular precession of the longitude of the pericentre
of a t... | [
{
"created": "Mon, 14 Sep 2009 14:50:42 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Sep 2009 14:57:38 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Mar 2010 15:41:28 GMT",
"version": "v3"
},
{
"created": "Fri, 28 May 2010 07:51:59 GMT",
"version": "v4"
},
{
"c... | 2016-11-25 | [
[
"Iorio",
"Lorenzo",
""
],
[
"Ruggiero",
"Matteo Luca",
""
]
] | We focus on Horava-Lifshitz (HL) theory of gravity, and, in particular, on the Kehagias and Sfetsos s solution that is the analog of Schwarzschild black hole of General Relativity. In the weak-field and slow-motion approximation we analytically work out the secular precession of the longitude of the pericentre of a tes... |
1102.5423 | James Ira Thorpe | James Ira Thorpe, Peiman Maghami, Jeffrey Livas | Time Domain Simulations of Arm Locking in LISA | Revised to address reviewer comments. Accepted by Phys. Rev. D | Phys.Rev.D83:122002,2011 | 10.1103/PhysRevD.83.122002 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Arm locking is a technique that has been proposed for reducing laser
frequency fluctuations in the Laser Interferometer Space Antenna (LISA), a
gravitational-wave observatory sensitive in the milliHertz frequency band. Arm
locking takes advantage of the geometric stability of the triangular
constellation of three spa... | [
{
"created": "Sat, 26 Feb 2011 15:07:15 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Apr 2011 14:07:29 GMT",
"version": "v2"
}
] | 2011-06-13 | [
[
"Thorpe",
"James Ira",
""
],
[
"Maghami",
"Peiman",
""
],
[
"Livas",
"Jeffrey",
""
]
] | Arm locking is a technique that has been proposed for reducing laser frequency fluctuations in the Laser Interferometer Space Antenna (LISA), a gravitational-wave observatory sensitive in the milliHertz frequency band. Arm locking takes advantage of the geometric stability of the triangular constellation of three space... |
gr-qc/0010060 | Julius Vanko | Jozef Sima, Miroslav Sukenik and Julius Vanko | Analysis of quantum evaporation process of black holes in the model of
Expansive Nondecelerative Universe | 6 pages, LaTeX | null | null | SSV-00-05 | gr-qc | null | In the model of Expansive Nondecelerative Universe, black hole cannot totally
evaporate via quantum evaporation process proposed by Hawking. In a limiting
case, an equilibrium of gravitation creation and black hole evaporation can be
reached keeping the surface of its horizon constant. This conclusion is in
accordanc... | [
{
"created": "Mon, 16 Oct 2000 08:41:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sima",
"Jozef",
""
],
[
"Sukenik",
"Miroslav",
""
],
[
"Vanko",
"Julius",
""
]
] | In the model of Expansive Nondecelerative Universe, black hole cannot totally evaporate via quantum evaporation process proposed by Hawking. In a limiting case, an equilibrium of gravitation creation and black hole evaporation can be reached keeping the surface of its horizon constant. This conclusion is in accordance ... |
2310.07410 | Himanshu Chaudhary | Himanshu Chaudhary, Niyaz Uddin Molla, Madhur Khurana, Ujjal Debnath,
G.Mustafa | Cosmological Test of Dark Energy Parametrizations in Horava-Lifshitz
Gravity | 24 pages, 20 figures, accepted for publication in European Physical
Journal C (EPJC) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we assume the FRLW Universe which is filled with dark matter
along with dark energy in the framework of Horava-Lifshitz (HL) gravity. The
dark energy is considered as the Linear (Model I) and CPL (Model II)
parametrizations of the equation of state parameter. For both models, we
express the Hubble param... | [
{
"created": "Wed, 11 Oct 2023 11:56:59 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Feb 2024 17:00:47 GMT",
"version": "v2"
}
] | 2024-02-07 | [
[
"Chaudhary",
"Himanshu",
""
],
[
"Molla",
"Niyaz Uddin",
""
],
[
"Khurana",
"Madhur",
""
],
[
"Debnath",
"Ujjal",
""
],
[
"Mustafa",
"G.",
""
]
] | In this work, we assume the FRLW Universe which is filled with dark matter along with dark energy in the framework of Horava-Lifshitz (HL) gravity. The dark energy is considered as the Linear (Model I) and CPL (Model II) parametrizations of the equation of state parameter. For both models, we express the Hubble paramet... |
2108.09466 | Jaroslav Vrba | Zden\v{e}k Stuchl\'ik and Jaroslav Vrba | Trapping of null geodesics in slowly rotating extremely compact Tolman
VII spacetimes | arXiv admin note: text overlap with arXiv:2011.13616 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Region of trapped null geodesics hidden inside of extremely compact objects
is of astrophysical importance because of trapping of gravitational waves, or
neutrinos. The trapping effect of null geodesics was extensively studied for
spherically symmetric extremely compact objects. Recently, influence of
rotation of the... | [
{
"created": "Sat, 21 Aug 2021 09:01:01 GMT",
"version": "v1"
}
] | 2021-08-24 | [
[
"Stuchlík",
"Zdeněk",
""
],
[
"Vrba",
"Jaroslav",
""
]
] | Region of trapped null geodesics hidden inside of extremely compact objects is of astrophysical importance because of trapping of gravitational waves, or neutrinos. The trapping effect of null geodesics was extensively studied for spherically symmetric extremely compact objects. Recently, influence of rotation of the e... |
gr-qc/9406004 | Melnikov Vitaly Nikolaevich | M. Yu. Konstantinov | Causality Properties of Topologically Nontrivial Space-Time Models | 9 pages., RGA-CSVR-007/94. 3 figures available by request | Int.J.Mod.Phys.D4:247-258,1995 | 10.1142/S0218271895000181 | null | gr-qc | null | The causality properties of space-time models with traversable wormholes are
considered. It is shown that relativity principle cannot be applied to the
motion of the wormhole's mouths in the outer space and the dynamical wormhole
transformation into the time machine is impossible. The examples of both causal
and nonc... | [
{
"created": "Fri, 3 Jun 1994 00:44:59 GMT",
"version": "v1"
}
] | 2011-04-20 | [
[
"Konstantinov",
"M. Yu.",
""
]
] | The causality properties of space-time models with traversable wormholes are considered. It is shown that relativity principle cannot be applied to the motion of the wormhole's mouths in the outer space and the dynamical wormhole transformation into the time machine is impossible. The examples of both causal and noncau... |
1910.05277 | Cliff Burgess | Ivana Babic, C.P. Burgess and Ghazal Geshnizjani | Keeping an Eye on DBI: Power-counting for small-$c_s$ Cosmology | 24 pages, 1 figure | null | 10.1088/1475-7516/2020/05/023 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inflationary mechanisms for generating primordial fluctuations ultimately
compute them as the leading contributions in a derivative expansion, with
corrections controlled by powers of derivatives like the Hubble scale over
Planck mass: $H/M_p$. At face value this derivative expansion breaks down for
models with a sma... | [
{
"created": "Fri, 11 Oct 2019 16:13:13 GMT",
"version": "v1"
}
] | 2020-05-20 | [
[
"Babic",
"Ivana",
""
],
[
"Burgess",
"C. P.",
""
],
[
"Geshnizjani",
"Ghazal",
""
]
] | Inflationary mechanisms for generating primordial fluctuations ultimately compute them as the leading contributions in a derivative expansion, with corrections controlled by powers of derivatives like the Hubble scale over Planck mass: $H/M_p$. At face value this derivative expansion breaks down for models with a small... |
1405.2465 | Genly Le\'on | Carlos R. Fadragas (Havana, Central de Las Villas U.) and Genly Leon
(Valparaiso U., Catolica) | Some remarks about non-minimally coupled scalar field models | 32 pages, 6 figures. Matches the published version in CQG | Class. Quantum Grav. 31, 195011 (2014) | 10.1088/0264-9381/31/19/195011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several results related to flat Friedmann-Lema\^{\i}tre-Robertson-Walker
models in the conformal (Einstein) frame of scalar-tensor gravity theories are
extended. Scalar fields with arbitrary (positive) potentials and arbitrary
coupling functions are considered. Mild assumptions under such functions
(differentiable cl... | [
{
"created": "Sat, 10 May 2014 19:43:44 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Oct 2014 21:46:09 GMT",
"version": "v2"
}
] | 2014-10-14 | [
[
"Fadragas",
"Carlos R.",
"",
"Havana, Central de Las Villas U."
],
[
"Leon",
"Genly",
"",
"Valparaiso U., Catolica"
]
] | Several results related to flat Friedmann-Lema\^{\i}tre-Robertson-Walker models in the conformal (Einstein) frame of scalar-tensor gravity theories are extended. Scalar fields with arbitrary (positive) potentials and arbitrary coupling functions are considered. Mild assumptions under such functions (differentiable clas... |
gr-qc/0105012 | Papakostas Taksiarhis | T.Papakostas | Anisotropic fluids in the case of stationary and axisymmetric spaces of
General Relativity | 14 pages,submitted to Int J Mod Phys D | Int.J.Mod.Phys. D10 (2001) 869-880 | 10.1142/S0218271801001268 | null | gr-qc | null | We present a stationary axisymmetric solution belonging to Carter's family
[A] of spaces and representing an anisotropic fluid configuration.
| [
{
"created": "Thu, 3 May 2001 08:23:00 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Papakostas",
"T.",
""
]
] | We present a stationary axisymmetric solution belonging to Carter's family [A] of spaces and representing an anisotropic fluid configuration. |
2209.01050 | Vladimir Kassandrov | Vladimir V. Kassandrov and Nina V. Markova | Extended geometry and kinematics induced by biquaternionic and twistor
structures | 9 pages. Report on the conference PIRT-21 | Journal of Physics: Conference Series (2021), 2081 012023, 012023 | 10.1088/1742-6596/2081/1/2023 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The algebra of biquaternions possess a manifestly Lorentz invariant form and
induces an extended space-time geometry. We consider the links between this
complex pre-geometry and real geometry of the Minkowski space-time. Twistor
structures naturally arise in the framework of biquaternionic analysis. Both
together, al... | [
{
"created": "Wed, 31 Aug 2022 13:05:07 GMT",
"version": "v1"
}
] | 2022-09-05 | [
[
"Kassandrov",
"Vladimir V.",
""
],
[
"Markova",
"Nina V.",
""
]
] | The algebra of biquaternions possess a manifestly Lorentz invariant form and induces an extended space-time geometry. We consider the links between this complex pre-geometry and real geometry of the Minkowski space-time. Twistor structures naturally arise in the framework of biquaternionic analysis. Both together, alge... |
1508.05745 | Arunava Bhadra Dr. | Samrat Ghosh and Arunava Bhadra | Influences of Dark Energy and dark matter on Gravitational Time
Advancement | 7 pages, no figure | Eur. Phys. J. C (2015) 75:494 | 10.1140/epjc/s10052-015-3719-8 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effect of dark matter/energy on gravitational time advancement (negative
effective time delay) has been investigated considering few dark energy/matter
models including cosmological constant. It is found that dark energy gives only
(positive) gravitational time delay irrespective of the position of the
observer w... | [
{
"created": "Mon, 24 Aug 2015 10:14:08 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Nov 2015 09:03:33 GMT",
"version": "v2"
}
] | 2015-11-09 | [
[
"Ghosh",
"Samrat",
""
],
[
"Bhadra",
"Arunava",
""
]
] | The effect of dark matter/energy on gravitational time advancement (negative effective time delay) has been investigated considering few dark energy/matter models including cosmological constant. It is found that dark energy gives only (positive) gravitational time delay irrespective of the position of the observer whe... |
1102.3803 | Remo Garattini | Remo Garattini and Gianluca Mandanici | Modified Dispersion Relations lead to a finite Zero Point Gravitational
Energy | LaTex 16 pages, 6 figures | Phys.Rev.D83:084021,2011 | 10.1103/PhysRevD.83.084021 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the Zero Point Energy in a spherically symmetric background
distorted at high energy as predicted by \textit{Gravity's Rainbow}. In this
context we setup a Sturm-Liouville problem with the cosmological constant
considered as the associated eigenvalue. The eigenvalue equation is a
reformulation of the Wheel... | [
{
"created": "Fri, 18 Feb 2011 10:44:17 GMT",
"version": "v1"
}
] | 2011-04-22 | [
[
"Garattini",
"Remo",
""
],
[
"Mandanici",
"Gianluca",
""
]
] | We compute the Zero Point Energy in a spherically symmetric background distorted at high energy as predicted by \textit{Gravity's Rainbow}. In this context we setup a Sturm-Liouville problem with the cosmological constant considered as the associated eigenvalue. The eigenvalue equation is a reformulation of the Wheeler... |
1812.07836 | Jibitesh Dutta | Jibitesh Dutta, Wompherdeiki Khyllep, Hmar Zonunmawia | Cosmological dynamics of the general non-canonical scalar field models | Revised to match EPJC version; 12 pages, 6 figures; Accepted in EPJC | The European Physical Journal C, (2019) 79: 359 | 10.1140/epjc/s10052-019-6885-2 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We extend the investigation of cosmological dynamics of the general
non-canonical scalar field models by dynamical system techniques for a broad
class of potentials and coupling functions. In other words, we do not restrict
the analysis to exponential or power-law potentials and coupling functions.
This type of inves... | [
{
"created": "Wed, 19 Dec 2018 09:32:04 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Apr 2019 12:49:24 GMT",
"version": "v2"
}
] | 2019-04-30 | [
[
"Dutta",
"Jibitesh",
""
],
[
"Khyllep",
"Wompherdeiki",
""
],
[
"Zonunmawia",
"Hmar",
""
]
] | We extend the investigation of cosmological dynamics of the general non-canonical scalar field models by dynamical system techniques for a broad class of potentials and coupling functions. In other words, we do not restrict the analysis to exponential or power-law potentials and coupling functions. This type of investi... |
gr-qc/9401004 | Roh-Suan Tung | James M. Nester, Roh-Suan Tung and Yuan Zhong Zhang | Ashtekar's New Variables and Positive Energy | 12 pages Plain TeX | Class.Quant.Grav.11:757-766,1994 | 10.1088/0264-9381/11/3/024 | null | gr-qc | null | We discuss earlier unsuccessful attempts to formulate a positive
gravitational energy proof in terms of the New Variables of Ashtekar. We also
point out the difficulties of a Witten spinor type proof. We then use the
special orthonormal frame gauge conditions to obtain a locally positive
expression for the New Variab... | [
{
"created": "Fri, 7 Jan 1994 16:51:47 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Nester",
"James M.",
""
],
[
"Tung",
"Roh-Suan",
""
],
[
"Zhang",
"Yuan Zhong",
""
]
] | We discuss earlier unsuccessful attempts to formulate a positive gravitational energy proof in terms of the New Variables of Ashtekar. We also point out the difficulties of a Witten spinor type proof. We then use the special orthonormal frame gauge conditions to obtain a locally positive expression for the New Variable... |
gr-qc/9212007 | Desmond Mc Manus | Des J. Mc Manus and Michel A. Vandyck | Weak-Field Gravity of Revolving Circular Cosmic Strings | 13 pages, LaTeX | Phys.Rev. D47 (1993) 1491-1496 | 10.1103/PhysRevD.47.1491 | null | gr-qc | null | A weak-field solution of Einstein's equations is constructed. It is generated
by a circular cosmic string revolving in its plane about the centre of the
circle. (The revolution is introduced to prevent the string from collapsing.)
This solution exhibits a conical singularity, and the corresponding deficit
angle is th... | [
{
"created": "Thu, 10 Dec 1992 15:33:40 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Manus",
"Des J. Mc",
""
],
[
"Vandyck",
"Michel A.",
""
]
] | A weak-field solution of Einstein's equations is constructed. It is generated by a circular cosmic string revolving in its plane about the centre of the circle. (The revolution is introduced to prevent the string from collapsing.) This solution exhibits a conical singularity, and the corresponding deficit angle is the ... |
2006.08663 | Baoyi Chen | Baoyi Chen, Feng-Li Lin, Bo Ning and Yanbei Chen | Constraints on low-energy effective theories from weak cosmic censorship | 22 pages, 2 figures | Phys. Rev. Lett. 126 (2021) 031102 | 10.1103/PhysRevLett.126.031102 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the weak cosmic censorship conjecture (WCCC) for the extremal
charged black hole in possible generalizations of Einstein-Maxwell theory due
to the higher order corrections, up to fourth-derivative terms. Our derivation
is based on Wald's gedanken experiment to destroy an extremal black hole. We
find that, ... | [
{
"created": "Mon, 15 Jun 2020 18:12:34 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Mar 2021 19:28:43 GMT",
"version": "v2"
}
] | 2021-03-09 | [
[
"Chen",
"Baoyi",
""
],
[
"Lin",
"Feng-Li",
""
],
[
"Ning",
"Bo",
""
],
[
"Chen",
"Yanbei",
""
]
] | We examine the weak cosmic censorship conjecture (WCCC) for the extremal charged black hole in possible generalizations of Einstein-Maxwell theory due to the higher order corrections, up to fourth-derivative terms. Our derivation is based on Wald's gedanken experiment to destroy an extremal black hole. We find that, pr... |
gr-qc/0201093 | George E. A. Matsas | Jorge Castineiras, Luis C. B. Crispino, George E. A. Matsas and Daniel
A. T. Vanzella | Free massive particles with total energy E < mc^2 in curved spacetimes | 12 pages (REVTEX), 12 figures | Phys.Rev. D65 (2002) 104019 | 10.1103/PhysRevD.65.104019 | null | gr-qc | null | We analyze free elementary particles with rest mass $m$ and total energy $E <
m c^2$ in the Rindler wedge, outside Reissner-Nordstrom black holes and in the
spacetime of relativistic (and non-relativistic) stars, and use
Unruh-DeWitt-like detectors to calculate the associated particle detection rate
in each case. The... | [
{
"created": "Wed, 30 Jan 2002 11:46:45 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Castineiras",
"Jorge",
""
],
[
"Crispino",
"Luis C. B.",
""
],
[
"Matsas",
"George E. A.",
""
],
[
"Vanzella",
"Daniel A. T.",
""
]
] | We analyze free elementary particles with rest mass $m$ and total energy $E < m c^2$ in the Rindler wedge, outside Reissner-Nordstrom black holes and in the spacetime of relativistic (and non-relativistic) stars, and use Unruh-DeWitt-like detectors to calculate the associated particle detection rate in each case. The (... |
2401.09482 | Dr. Sudhaker Upadhyay | Behnam Pourhassan, Seyed Hossein Hendi, Sudhaker Upadhyay, Izzet
Sakalli, Emmanuel N. Saridakis | Thermal fluctuations of (non)linearly charged BTZ black hole in massive
gravity | 25 pages, 25 captioned figures, to appear in IJMPD | null | 10.1142/S0218271823501109 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider a charged BTZ black hole in asymptotically AdS space-time of
massive gravity to study the effect of the thermal fluctuations on the black
hole thermodynamics. We consider the Einstein-Born-Infeld solution and
investigate critical points and stability. We also compare the results with the
case of Einstein-... | [
{
"created": "Mon, 15 Jan 2024 18:12:00 GMT",
"version": "v1"
}
] | 2024-01-19 | [
[
"Pourhassan",
"Behnam",
""
],
[
"Hendi",
"Seyed Hossein",
""
],
[
"Upadhyay",
"Sudhaker",
""
],
[
"Sakalli",
"Izzet",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We consider a charged BTZ black hole in asymptotically AdS space-time of massive gravity to study the effect of the thermal fluctuations on the black hole thermodynamics. We consider the Einstein-Born-Infeld solution and investigate critical points and stability. We also compare the results with the case of Einstein-Ma... |
gr-qc/0701140 | Bayram Tekin | S. Deser and Bayram Tekin | New Energy Definition for Higher Curvature Gravities | 3 pages, Typos fixed | Phys.Rev.D75:084032,2007 | 10.1103/PhysRevD.75.084032 | BRX-TH-585 | gr-qc hep-th | null | We propose a novel but natural definition of conserved quantities for gravity
models quadratic and higher in curvature. Based on the spatial asymptotics of
curvature rather than of metric, it avoids the GR energy machinery's more
egregious problems--such as zero energy "theorems" and failure in flat
backgrounds -- in... | [
{
"created": "Thu, 25 Jan 2007 20:49:27 GMT",
"version": "v1"
},
{
"created": "Thu, 3 May 2007 13:46:17 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Deser",
"S.",
""
],
[
"Tekin",
"Bayram",
""
]
] | We propose a novel but natural definition of conserved quantities for gravity models quadratic and higher in curvature. Based on the spatial asymptotics of curvature rather than of metric, it avoids the GR energy machinery's more egregious problems--such as zero energy "theorems" and failure in flat backgrounds -- in t... |
gr-qc/0605124 | Charles Wang | Charles H.-T. Wang | New 'phase' of quantum gravity | 17 pages, 6 figures, To appear in the 2006 Christmas Issue of Phil.
Trans. Roy. Soc. A | Phil.Trans.Roy.Soc.Lond. A364 (2006) 3375-3388 | 10.1098/rsta.2006.1904 | null | gr-qc hep-th physics.pop-ph quant-ph | null | The emergence of loop quantum gravity over the past two decades has
stimulated a great resurgence of interest in unifying general relativity and
quantum mechanics. Amongst a number of appealing features of this approach are
the intuitive picture of quantum geometry using spin networks and powerful
mathematical tools ... | [
{
"created": "Wed, 24 May 2006 00:51:44 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2006 20:59:32 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Wang",
"Charles H. -T.",
""
]
] | The emergence of loop quantum gravity over the past two decades has stimulated a great resurgence of interest in unifying general relativity and quantum mechanics. Amongst a number of appealing features of this approach are the intuitive picture of quantum geometry using spin networks and powerful mathematical tools fr... |
gr-qc/9310016 | null | J.W. Barrett and T.J. Foxon | Semi-Classical Limits of Simplicial Quantum Gravity | 14 pages in Plain TeX, (figures available on request), DAMTP-R93/26 | Class.Quant.Grav.11:543-556,1994 | 10.1088/0264-9381/11/3/009 | null | gr-qc hep-th | null | We consider the simplicial state-sum model of Ponzano and Regge as a path
integral for quantum gravity in three dimensions.
We examine the Lorentzian geometry of a single 3-simplex and of a simplicial
manifold, and interpret an asymptotic formula for $6j$-symbols in terms of this
geometry. This extends Ponzano and ... | [
{
"created": "Fri, 8 Oct 1993 12:11:36 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Barrett",
"J. W.",
""
],
[
"Foxon",
"T. J.",
""
]
] | We consider the simplicial state-sum model of Ponzano and Regge as a path integral for quantum gravity in three dimensions. We examine the Lorentzian geometry of a single 3-simplex and of a simplicial manifold, and interpret an asymptotic formula for $6j$-symbols in terms of this geometry. This extends Ponzano and Regg... |
1706.01112 | Maur\'icio Richartz | Maur\'icio Richartz, Carlos A. R. Herdeiro, Emanuele Berti | Synchronous frequencies of extremal Kerr black holes: resonances,
scattering and stability | v2: 10 pages, 2 figures, 1 table. Matches published version | Phys. Rev. D 96, 044034 (2017) | 10.1103/PhysRevD.96.044034 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The characteristic damping times of the natural oscillations of a Kerr black
hole become arbitrarily large as the extremal limit is approached. This
behavior is associated with the so-called zero damped modes (ZDMs), and
suggests that extremal black holes are characterized by quasinormal modes whose
frequencies are p... | [
{
"created": "Sun, 4 Jun 2017 17:19:53 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Aug 2017 03:06:22 GMT",
"version": "v2"
}
] | 2017-08-28 | [
[
"Richartz",
"Maurício",
""
],
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Berti",
"Emanuele",
""
]
] | The characteristic damping times of the natural oscillations of a Kerr black hole become arbitrarily large as the extremal limit is approached. This behavior is associated with the so-called zero damped modes (ZDMs), and suggests that extremal black holes are characterized by quasinormal modes whose frequencies are pur... |
2011.06711 | Ai-Chen Li | Ai-chen Li, Xin-Fei Li | Morris-Thorne Wormhole in the Vector-Tensor theories with Abelian gauge
symmetry breaking | null | Phys. Rev. D 104, 044006 (2021) | 10.1103/PhysRevD.104.044006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct an asymptotically flat Morris-Thorne wormhole solution supported
by anisotropic matter fluid and a vector field which is coupled to gravity in a
non-minimal way with broken Abelian gauge symmetry. In this paper, a specific
shape function is considered. We find that the ansatz of vector field plays a
sign... | [
{
"created": "Fri, 13 Nov 2020 01:05:14 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Aug 2021 19:55:34 GMT",
"version": "v2"
}
] | 2021-08-06 | [
[
"Li",
"Ai-chen",
""
],
[
"Li",
"Xin-Fei",
""
]
] | We construct an asymptotically flat Morris-Thorne wormhole solution supported by anisotropic matter fluid and a vector field which is coupled to gravity in a non-minimal way with broken Abelian gauge symmetry. In this paper, a specific shape function is considered. We find that the ansatz of vector field plays a signif... |
2303.08399 | Chao Zhang | Chao Zhang, Anzhong Wang and Tao Zhu | Odd-parity perturbations of the wormhole-like geometries and
quasi-normal modes in Einstein-\AE{}ther theory | 15 pages, 14 figures. arXiv admin note: substantial text overlap with
arXiv:2209.04735 | JCAP05(2023)059 | 10.1088/1475-7516/2023/05/059 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Einstein-$\AE$ther theory has drawn a lot of attentions in recent years.
As a representative case of gravitational theories that break the Lorentz
symmetry, it plays an important role in testing the Lorentz-violating effects
and shedding light on the attempts to construct quantum gravity. Since the
first detectio... | [
{
"created": "Wed, 15 Mar 2023 07:03:05 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jun 2023 05:54:01 GMT",
"version": "v2"
}
] | 2023-06-05 | [
[
"Zhang",
"Chao",
""
],
[
"Wang",
"Anzhong",
""
],
[
"Zhu",
"Tao",
""
]
] | The Einstein-$\AE$ther theory has drawn a lot of attentions in recent years. As a representative case of gravitational theories that break the Lorentz symmetry, it plays an important role in testing the Lorentz-violating effects and shedding light on the attempts to construct quantum gravity. Since the first detection ... |
gr-qc/0106021 | Vishwakarma R. G. | R. G. Vishwakarma | Study of the Magnitude-Redshift Relation for type Ia Supernovae in a
Model resulting from a Ricci-Symmetry | 14 pages including 1 figure, accepted for publication in Gen.
Relativ. Grav | Gen.Rel.Grav. 33 (2001) 1973-1984 | 10.1023/A:1013051026760 | null | gr-qc astro-ph | null | Models with a dynamic cosmological term \Lambda (t) are becoming popular as
they solve the cosmological constant problem in a natural way. Instead of
considering any ad-hoc assumption for the variation of \Lambda, we consider a
particular symmetry, the contracted Ricci-collineation along the fluid flow, in
Einstein's... | [
{
"created": "Wed, 6 Jun 2001 12:35:28 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Vishwakarma",
"R. G.",
""
]
] | Models with a dynamic cosmological term \Lambda (t) are becoming popular as they solve the cosmological constant problem in a natural way. Instead of considering any ad-hoc assumption for the variation of \Lambda, we consider a particular symmetry, the contracted Ricci-collineation along the fluid flow, in Einstein's t... |
gr-qc/0612123 | Enrico Barausse | Enrico Barausse, Luciano Rezzolla, David Petroff, Marcus Ansorg | Gravitational waves from Extreme Mass Ratio Inspirals in non-pure Kerr
spacetimes | 21 pages, 12 figures. Short discussion on the accuracy of the
spacetimes added, typos corrected. Accepted for publication in PRD | Phys.Rev.D75:064026,2007 | 10.1103/PhysRevD.75.064026 | null | gr-qc astro-ph | null | To investigate the imprint on the gravitational-wave emission from extreme
mass-ratio inspirals in non-pure Kerr spacetimes, we have studied the
``kludge'' waveforms generated in highly-accurate, numerically-generated
spacetimes containing a black hole and a self-gravitating, homogeneous torus
with comparable mass an... | [
{
"created": "Wed, 20 Dec 2006 19:43:32 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Feb 2007 13:47:47 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Barausse",
"Enrico",
""
],
[
"Rezzolla",
"Luciano",
""
],
[
"Petroff",
"David",
""
],
[
"Ansorg",
"Marcus",
""
]
] | To investigate the imprint on the gravitational-wave emission from extreme mass-ratio inspirals in non-pure Kerr spacetimes, we have studied the ``kludge'' waveforms generated in highly-accurate, numerically-generated spacetimes containing a black hole and a self-gravitating, homogeneous torus with comparable mass and ... |
1205.0884 | Vicente Jos\'e Bol\'os | Vicente J. Bol\'os | Kinematic relative velocity with respect to stationary observers in
Schwarzschild spacetime | 8 pages, 2 figures | J. Geom. Phys. 66 (2013), 18-23 | 10.1016/j.geomphys.2012.12.005 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the kinematic relative velocity of general test particles with
respect to stationary observers (using spherical coordinates) in Schwarzschild
spacetime, obtaining that its modulus does not depend on the observer, unlike
Fermi, spectroscopic and astrometric relative velocities. We study some
fundamental parti... | [
{
"created": "Fri, 4 May 2012 08:48:01 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Dec 2012 09:04:34 GMT",
"version": "v2"
}
] | 2013-01-24 | [
[
"Bolós",
"Vicente J.",
""
]
] | We study the kinematic relative velocity of general test particles with respect to stationary observers (using spherical coordinates) in Schwarzschild spacetime, obtaining that its modulus does not depend on the observer, unlike Fermi, spectroscopic and astrometric relative velocities. We study some fundamental particu... |
1607.02759 | Lars Andersson | Lars Andersson, Siyuan Ma, Claudio Paganini, Bernard F. Whiting | Mode stability on the real axis | 20 pages, 4 figures. Reference added, revtex4-1 format | null | 10.1063/1.4991656 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A generalization of the mode stability result of Whiting (1989) for the
Teukolsky equation is proved for the case of real frequencies. The main result
of the paper states that a separated solution of the Teukolsky equation
governing massless test fields on the Kerr spacetime, which is purely outgoing
at infinity, and... | [
{
"created": "Sun, 10 Jul 2016 15:52:18 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Sep 2016 10:22:48 GMT",
"version": "v2"
}
] | 2017-08-02 | [
[
"Andersson",
"Lars",
""
],
[
"Ma",
"Siyuan",
""
],
[
"Paganini",
"Claudio",
""
],
[
"Whiting",
"Bernard F.",
""
]
] | A generalization of the mode stability result of Whiting (1989) for the Teukolsky equation is proved for the case of real frequencies. The main result of the paper states that a separated solution of the Teukolsky equation governing massless test fields on the Kerr spacetime, which is purely outgoing at infinity, and p... |
2303.09392 | Jorge Pullin | Rodolfo Gambini and Jorge Pullin | Loop quantum gravity of a spherically symmetric scalar field coupled to
gravity with a clock | 10 pages, RevTex, no figures, to appear in Classical and Quantum
Gravity | Class. Quantum Grav. 40 085016 (2023) | 10.1088/1361-6382/acc510 | LSU-REL-031623 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inclusion of matter fields in spherically symmetric loop quantum gravity
has proved problematic at the level of implementing the constraint algebra
including the Hamiltonian constraint. Here we consider the system with the
introduction of a clock. Using the Abelianizaton technique we introduced in
previous papers... | [
{
"created": "Thu, 16 Mar 2023 15:32:37 GMT",
"version": "v1"
}
] | 2023-08-08 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
]
] | The inclusion of matter fields in spherically symmetric loop quantum gravity has proved problematic at the level of implementing the constraint algebra including the Hamiltonian constraint. Here we consider the system with the introduction of a clock. Using the Abelianizaton technique we introduced in previous papers i... |
2407.18644 | Anna Chrysostomou | Chun-Hung Chen, Hing-Tong Cho, Anna Chrysostomou and Alan S. Cornell | A semi-analytic treatment of quasinormal excitation factors in the
eikonal regime | 32 pages, 4 figures, 3 tables, and 2 appendices | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we present an enhanced semi-analytic method for calculating
quasinormal excitation factors in the eikonal regime, specifically for
Schwarzschild black holes. To achieve improved accuracy in our quasinormal mode
computations, we extend the Dolan and Ottewill inverse multipolar expansion
technique and in... | [
{
"created": "Fri, 26 Jul 2024 10:22:44 GMT",
"version": "v1"
}
] | 2024-07-29 | [
[
"Chen",
"Chun-Hung",
""
],
[
"Cho",
"Hing-Tong",
""
],
[
"Chrysostomou",
"Anna",
""
],
[
"Cornell",
"Alan S.",
""
]
] | In this paper, we present an enhanced semi-analytic method for calculating quasinormal excitation factors in the eikonal regime, specifically for Schwarzschild black holes. To achieve improved accuracy in our quasinormal mode computations, we extend the Dolan and Ottewill inverse multipolar expansion technique and inco... |
1103.3204 | Giampiero Esposito Dr. | Donato Bini, Giampiero Esposito, Andrea Geralico | de Sitter spacetime: effects of metric perturbations on geodesic motion | IOP macros, 10 figures | null | 10.1007/s10714-011-1287-2 | DSF preprint 2011/2 | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational perturbations of the de Sitter spacetime are investigated using
the Regge--Wheeler formalism. The set of perturbation equations is reduced to a
single second order differential equation of the Heun-type for both electric
and magnetic multipoles. The solution so obtained is used to study the
deviation fr... | [
{
"created": "Wed, 16 Mar 2011 15:40:37 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Bini",
"Donato",
""
],
[
"Esposito",
"Giampiero",
""
],
[
"Geralico",
"Andrea",
""
]
] | Gravitational perturbations of the de Sitter spacetime are investigated using the Regge--Wheeler formalism. The set of perturbation equations is reduced to a single second order differential equation of the Heun-type for both electric and magnetic multipoles. The solution so obtained is used to study the deviation from... |
gr-qc/0310042 | Erik Schnetter | Erik Schnetter, Scott H. Hawley, and Ian Hawke | Evolutions in 3D numerical relativity using fixed mesh refinement | 20 pages, 15 figures; published version, but with colour figures | Class.Quant.Grav.21:1465-1488,2004 | 10.1088/0264-9381/21/6/014 | AEI-2003-078 | gr-qc | null | We present results of 3D numerical simulations using a finite difference code
featuring fixed mesh refinement (FMR), in which a subset of the computational
domain is refined in space and time. We apply this code to a series of test
cases including a robust stability test, a nonlinear gauge wave and an excised
Schwarz... | [
{
"created": "Tue, 7 Oct 2003 16:46:32 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jan 2004 11:56:18 GMT",
"version": "v2"
},
{
"created": "Tue, 2 Mar 2004 14:04:24 GMT",
"version": "v3"
}
] | 2010-04-06 | [
[
"Schnetter",
"Erik",
""
],
[
"Hawley",
"Scott H.",
""
],
[
"Hawke",
"Ian",
""
]
] | We present results of 3D numerical simulations using a finite difference code featuring fixed mesh refinement (FMR), in which a subset of the computational domain is refined in space and time. We apply this code to a series of test cases including a robust stability test, a nonlinear gauge wave and an excised Schwarzsc... |
1104.2140 | Emilio Santos Corchero | Emilio Santos | Neutron stars in generalized f(R) gravity | Keywords: stars, neutron stars; gravity; modified gravity Accepted in
Astrophysics and Space Science | Astrophysics and Space Science (2012) 341,411-416 | 10.1007/s10509-012-1049-y | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quartic gravity theory is considered with the Einstein-Hilbert Lagrangean
$R+aR^{2}+bR_{\mu \nu}R^{\mu \nu},$ $R_{\mu \nu}$ being Ricci\'s tensor and R
the curvature scalar. The parameters $a$ and $b$ are taken of order 1 km$^{2}.$
Arguments are given which suggest that the effective theory so obtained may be
a plaus... | [
{
"created": "Tue, 12 Apr 2011 08:47:48 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2011 09:33:04 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Nov 2011 12:28:51 GMT",
"version": "v3"
},
{
"created": "Sat, 3 Mar 2012 10:41:19 GMT",
"version": "v4"
}
] | 2021-06-16 | [
[
"Santos",
"Emilio",
""
]
] | Quartic gravity theory is considered with the Einstein-Hilbert Lagrangean $R+aR^{2}+bR_{\mu \nu}R^{\mu \nu},$ $R_{\mu \nu}$ being Ricci\'s tensor and R the curvature scalar. The parameters $a$ and $b$ are taken of order 1 km$^{2}.$ Arguments are given which suggest that the effective theory so obtained may be a plausib... |
gr-qc/0101047 | Sascha Husa | Sascha Husa, Roberto Gomez and Jeffrey Winicour | Complete null data for a black hole collision | 2 pages, uses World Scientific style file ws-p9-75x6-50.cls
(enclosed), contribution to the 9th Marcel Grossmann meeting (MG9), Rome,
July 2000 | null | 10.1142/9789812777386_0316 | AEI-2001-004 | gr-qc | null | We discuss a sequence of numerically constructed geometries describing binary
black hole event horizons -- providing the necessary input for characteristic
evolution of the exterior spacetime. Our sequence approaches a single
Schwarzschild horizon as one limiting case and also includes cases where the
horizon's cross... | [
{
"created": "Fri, 12 Jan 2001 16:10:39 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Husa",
"Sascha",
""
],
[
"Gomez",
"Roberto",
""
],
[
"Winicour",
"Jeffrey",
""
]
] | We discuss a sequence of numerically constructed geometries describing binary black hole event horizons -- providing the necessary input for characteristic evolution of the exterior spacetime. Our sequence approaches a single Schwarzschild horizon as one limiting case and also includes cases where the horizon's crossov... |
0710.5282 | Emre Kahya Mr. | E. O. Kahya and R. P. Woodard | Scalar Field Equations from Quantum Gravity during Inflation | 19 pages, 5 tables | Phys.Rev.D77:084012,2008 | 10.1103/PhysRevD.77.084012 | UFIFT-QG-07-05 | gr-qc astro-ph hep-th | null | We exploit a previous computation of the self-mass-squared from quantum
gravity to include quantum corrections to the scalar evolution equation. The
plane wave mode functions are shown to receive no significant one loop
corrections at late times. This result probably applies as well to the inflaton
of scalar-driven i... | [
{
"created": "Sun, 28 Oct 2007 18:20:12 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kahya",
"E. O.",
""
],
[
"Woodard",
"R. P.",
""
]
] | We exploit a previous computation of the self-mass-squared from quantum gravity to include quantum corrections to the scalar evolution equation. The plane wave mode functions are shown to receive no significant one loop corrections at late times. This result probably applies as well to the inflaton of scalar-driven inf... |
gr-qc/0602078 | Ruxandra Bondarescu | Jayashree Balakrishna, Ruxandra Bondarescu, Gregory Daues, F.
Siddhartha Guzman and Edward Seidel | Evolution of 3D Boson Stars with Waveform Extraction | 26 pages, 12 figures | Class.Quant.Grav. 23 (2006) 2631-2652 | 10.1088/0264-9381/23/7/024 | null | gr-qc | null | Numerical results from a study of boson stars under nonspherical
perturbations using a fully general relativistic 3D code are presented together
with the analysis of emitted gravitational radiation. We have constructed a
simulation code suitable for the study of scalar fields in space-times of
general symmetry by bri... | [
{
"created": "Mon, 20 Feb 2006 20:48:11 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Mar 2006 22:04:37 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Balakrishna",
"Jayashree",
""
],
[
"Bondarescu",
"Ruxandra",
""
],
[
"Daues",
"Gregory",
""
],
[
"Guzman",
"F. Siddhartha",
""
],
[
"Seidel",
"Edward",
""
]
] | Numerical results from a study of boson stars under nonspherical perturbations using a fully general relativistic 3D code are presented together with the analysis of emitted gravitational radiation. We have constructed a simulation code suitable for the study of scalar fields in space-times of general symmetry by bring... |
0908.2605 | Roman Sverdlov | Thomas Scanlon, Roman Sverdlov | A use of geometric calculus to reduce Berezin integral to the limit of a
Riemann sum | 34 pages, no figures | Journal of Mathematical Physics 61, 063505 (2020) | 10.1063/1.5144877 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Berezin integration of functions of anticommuting Grassmann variables is
usually seen as a formal operation, sometimes even defined via differentiation.
Using the formalism of geometric algebra and geometric calculus in which the
Grassmann numbers are endowed with a second associative product coming from a
Clifford a... | [
{
"created": "Tue, 18 Aug 2009 19:26:35 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Aug 2009 14:03:29 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Aug 2009 07:42:11 GMT",
"version": "v3"
},
{
"created": "Wed, 2 Sep 2015 19:56:17 GMT",
"version": "v4"
},
{
"cr... | 2020-06-19 | [
[
"Scanlon",
"Thomas",
""
],
[
"Sverdlov",
"Roman",
""
]
] | Berezin integration of functions of anticommuting Grassmann variables is usually seen as a formal operation, sometimes even defined via differentiation. Using the formalism of geometric algebra and geometric calculus in which the Grassmann numbers are endowed with a second associative product coming from a Clifford alg... |
0903.4723 | Pin Yu | Pin Yu | On Hawking's Local Rigidity Theorems for Charged Black Holes | 20 pages | Annales Henri Poincare 11:1-21,2010 | 10.1007/s00023-010-0033-8 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show the existence of a Hawking vector field in a full neighborhood of a
local, regular, bifurcate, non-expanding horizon embedded in a smooth
Einstein-Maxwell space-time without assuming the underlying space-time is
analytic. It extends one result of Friedrich, R\'{a}cz and Wald, which was
limited to the interior... | [
{
"created": "Fri, 27 Mar 2009 01:35:58 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Yu",
"Pin",
""
]
] | We show the existence of a Hawking vector field in a full neighborhood of a local, regular, bifurcate, non-expanding horizon embedded in a smooth Einstein-Maxwell space-time without assuming the underlying space-time is analytic. It extends one result of Friedrich, R\'{a}cz and Wald, which was limited to the interior o... |
1107.0718 | Juan Antonio Nieto | J. A. Nieto | Canonical gravity in two time and two space dimensions | 13 pages, Latex, improved version | Int. J. Geom. Meth. Mod. Phys. 09 (2012) 1250069 | 10.1142/S0219887812500697 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a program for developing a canonical gravity in 2+2 dimensions
(two time and two space dimensions). Our procedure is similar to the usual
canonical gravity but with two times rather than just one time. Our work may be
of particular interest as an alternative approach to loop quantum gravity in
2+2 dimensi... | [
{
"created": "Thu, 23 Jun 2011 17:26:13 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Sep 2011 16:46:49 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Nov 2011 16:51:37 GMT",
"version": "v3"
}
] | 2014-08-28 | [
[
"Nieto",
"J. A.",
""
]
] | We describe a program for developing a canonical gravity in 2+2 dimensions (two time and two space dimensions). Our procedure is similar to the usual canonical gravity but with two times rather than just one time. Our work may be of particular interest as an alternative approach to loop quantum gravity in 2+2 dimension... |
1001.1255 | Hossein Farajollahi | Hossein Farajollahi, Narges Mohamadi | Generalized Brans-Dicke cosmology in the presence of matter and dark
energy | 9 pages | Int.J.Theor.Phys.49:72-78,2010 | 10.1007/s10773-009-0179-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Generalized Brans-Dicke cosmology in the presence of matter and
dark energy. Of particular interest for a constant Brans-Dicke parameter, the
de Sitter space has also been investigated.
| [
{
"created": "Fri, 8 Jan 2010 12:31:19 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jun 2011 07:20:04 GMT",
"version": "v2"
}
] | 2011-06-09 | [
[
"Farajollahi",
"Hossein",
""
],
[
"Mohamadi",
"Narges",
""
]
] | We study the Generalized Brans-Dicke cosmology in the presence of matter and dark energy. Of particular interest for a constant Brans-Dicke parameter, the de Sitter space has also been investigated. |
gr-qc/0105018 | Diego F. Torres | M. E. Pessah, and Diego F. Torres | Statistical mechanics and the description of the early universe II.
Principle of detailed balance and primordial 4He formation | 24 pages, to appear in Physica A (2001) | Physica A297 (2001) 201-228 | 10.1016/S0378-4371(01)00236-9 | null | gr-qc astro-ph cond-mat.stat-mech | null | If the universe is slightly non-extensive, and the distribution functions are
not exactly given by those of Boltzmann-Gibbs, the primordial production of
light elements will be non-trivially modified. In particular, the principle of
detailed balance (PDB), of fundamental importance in the standard analytical
analysis... | [
{
"created": "Fri, 4 May 2001 15:28:55 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Pessah",
"M. E.",
""
],
[
"Torres",
"Diego F.",
""
]
] | If the universe is slightly non-extensive, and the distribution functions are not exactly given by those of Boltzmann-Gibbs, the primordial production of light elements will be non-trivially modified. In particular, the principle of detailed balance (PDB), of fundamental importance in the standard analytical analysis, ... |
2202.04249 | Norichika Sago | Norichika Sago, Takahiro Tanaka | Efficient search method of anomalous reflection by the central object in
an EMRI system by future space gravitational wave detectors | 10 pages, 9 figures. v2: 11 pages, 9 figures, accepted version | null | 10.1103/PhysRevD.106.024032 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In our previous work we investigated the effect of the hypothetical
reflecting boundary near the black hole event horizon on the waveform from
extreme mass-ratio inspirals (EMRIs). Even if the reflection efficiency is not
extremely high, we found that a significant modification of the waveform can be
expected. Then, ... | [
{
"created": "Wed, 9 Feb 2022 03:14:15 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jul 2022 01:12:43 GMT",
"version": "v2"
}
] | 2022-08-31 | [
[
"Sago",
"Norichika",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | In our previous work we investigated the effect of the hypothetical reflecting boundary near the black hole event horizon on the waveform from extreme mass-ratio inspirals (EMRIs). Even if the reflection efficiency is not extremely high, we found that a significant modification of the waveform can be expected. Then, th... |
gr-qc/0604118 | Robert D. Klauber | Robert D. Klauber | Relativistic Rotation: A Comparison of Theories | 45 pages including 11 figures and one table. Revision includes
suggestions by reviewers | Found.Phys.37:198-252,2007 | 10.1007/s10701-006-9099-z | null | gr-qc | null | Alternative theories of relativistic rotation considered viable as of 2004
are compared in the light of experiments reported in 2005. En route, the
contentious issue of simultaneity choice in rotation is resolved by showing
that only one simultaneity choice, the one possessing continuous time, gives
rise, via the gen... | [
{
"created": "Thu, 27 Apr 2006 15:22:42 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Dec 2006 21:58:39 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Klauber",
"Robert D.",
""
]
] | Alternative theories of relativistic rotation considered viable as of 2004 are compared in the light of experiments reported in 2005. En route, the contentious issue of simultaneity choice in rotation is resolved by showing that only one simultaneity choice, the one possessing continuous time, gives rise, via the gener... |
0905.2983 | Francesca Vidotto | Carlo Rovelli and Francesca Vidotto | Single particle in quantum gravity and Braunstein-Ghosh-Severini entropy
of a spin network | 8 pages | Phys.Rev.D81:044038,2010 | 10.1103/PhysRevD.81.044038 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Passerini and Severini have recently shown that the Braunstein-Ghosh-Severini
(BGS) entropy S(Gamma) = -Tr[rho(Gamma) log rho(Gamma)] of a certain density
matrix rho(Gamma) naturally associated to a graph Gamma, is maximized, among
all graphs with a fixed number of links and nodes, by regular graphs. We ask if
this r... | [
{
"created": "Mon, 18 May 2009 20:59:39 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Feb 2010 18:11:19 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Rovelli",
"Carlo",
""
],
[
"Vidotto",
"Francesca",
""
]
] | Passerini and Severini have recently shown that the Braunstein-Ghosh-Severini (BGS) entropy S(Gamma) = -Tr[rho(Gamma) log rho(Gamma)] of a certain density matrix rho(Gamma) naturally associated to a graph Gamma, is maximized, among all graphs with a fixed number of links and nodes, by regular graphs. We ask if this res... |
1009.5998 | Miquel Trias | T. Damour, A. Nagar and M. Trias | Accuracy and effectualness of closed-form, frequency-domain waveforms
for non-spinning black hole binaries | 29 pages, 8 figures, 1 table. Accepted for publication in Phys. Rev.
D | Phys.Rev.D83:024006,2011 | 10.1103/PhysRevD.83.024006 | LIGO-P1000099-v3 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The coalescences of binary black hole (BBH) systems, here taken to be
non-spinning, are among the most promising sources for gravitational wave (GW)
ground-based detectors, such as LIGO and Virgo. To detect the GW signals
emitted by BBHs, and measure the parameters of the source, one needs to have in
hand a bank of G... | [
{
"created": "Wed, 29 Sep 2010 20:18:13 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Dec 2010 22:51:21 GMT",
"version": "v2"
}
] | 2011-02-25 | [
[
"Damour",
"T.",
""
],
[
"Nagar",
"A.",
""
],
[
"Trias",
"M.",
""
]
] | The coalescences of binary black hole (BBH) systems, here taken to be non-spinning, are among the most promising sources for gravitational wave (GW) ground-based detectors, such as LIGO and Virgo. To detect the GW signals emitted by BBHs, and measure the parameters of the source, one needs to have in hand a bank of GW ... |
2110.01104 | Bei Lok Hu | Bei-Lok Hu | Weyl Curvature Hypothesis in light of Quantum Backreaction at
Cosmological Singularities or Bounces | This v2 (57 pages) contains a footnote on how WCH fares with
inflationary cosmology, and expanded descriptions of ekpyrotic cosmology in
the contraction phase and quantum BLK-mixmaster models. To appear in the
journal "Universe": Special Issue on Quantum Cosmology | Universe 7, 424 (2021) | 10.3390/universe7110424 | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | Penrose's 1979 Weyl curvature hypothesis (WCH) \cite{WCH} assumes that the
universe began at a very low gravitational entropy state, corresponding to zero
Weyl curvature, namely, the FLRW universe. This is a simple assumption with
far-reaching implications. In classical general relativity the most general
cosmologica... | [
{
"created": "Sun, 3 Oct 2021 21:22:08 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Oct 2021 21:05:42 GMT",
"version": "v2"
}
] | 2021-11-09 | [
[
"Hu",
"Bei-Lok",
""
]
] | Penrose's 1979 Weyl curvature hypothesis (WCH) \cite{WCH} assumes that the universe began at a very low gravitational entropy state, corresponding to zero Weyl curvature, namely, the FLRW universe. This is a simple assumption with far-reaching implications. In classical general relativity the most general cosmological ... |
gr-qc/9411013 | Sardanashvily Gennadi | G.Sardanashvily | Gravity as a Higgs Field. III. Nongravitional Deviations of
Gravitational Fields | 17 pp., compuscript LaTeX | null | null | TP\94\219 | gr-qc | null | In Parts I and II of the work (gr-qc/9405013, 9407032), we have shown that
gravity is {\it sui generis} a Higgs field corresponding to spontaneous
symmetry breaking when the fermion matter admits only the Lorentz subgroup of
world symmetries of the geometric arena. From the mathematical viewpoint, the
Higgs nature of... | [
{
"created": "Sun, 6 Nov 1994 00:17:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sardanashvily",
"G.",
""
]
] | In Parts I and II of the work (gr-qc/9405013, 9407032), we have shown that gravity is {\it sui generis} a Higgs field corresponding to spontaneous symmetry breaking when the fermion matter admits only the Lorentz subgroup of world symmetries of the geometric arena. From the mathematical viewpoint, the Higgs nature of g... |
0901.4106 | Benjamin Koch | Benjamin Koch | A geometrical dual to relativistic Bohmian mechanics - the multi
particle case | 7 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article it is shown that the fundamental equations of relativistic
Bohmian mechanics for multiple bosonic particles have a dual description in
terms of a classical theory of curved space-time. We further generalize the
results to interactions with an external electromagnetic field, which
corresponds to the mi... | [
{
"created": "Tue, 27 Jan 2009 13:35:10 GMT",
"version": "v1"
}
] | 2009-01-28 | [
[
"Koch",
"Benjamin",
""
]
] | In this article it is shown that the fundamental equations of relativistic Bohmian mechanics for multiple bosonic particles have a dual description in terms of a classical theory of curved space-time. We further generalize the results to interactions with an external electromagnetic field, which corresponds to the mini... |
2206.07715 | Ben Kain | Joseph E. Nyhan, Ben Kain | Dynamical evolution of fermion-boson stars with realistic equations of
state | 12 pages, 6 figures. arXiv admin note: text overlap with
arXiv:2201.02274 | Phys. Rev. D 105, 123016 (2022) | 10.1103/PhysRevD.105.123016 | null | gr-qc astro-ph.HE hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fermion-boson stars are mixtures of the ordinary nuclear matter of a neutron
star and bosonic dark matter. We dynamically evolve fermion-boson stars for the
first time using a realistic equation of state for nuclear matter. We use our
dynamical solutions to make a detailed study of the evolution of weakly and
strongl... | [
{
"created": "Wed, 15 Jun 2022 18:00:00 GMT",
"version": "v1"
}
] | 2022-06-29 | [
[
"Nyhan",
"Joseph E.",
""
],
[
"Kain",
"Ben",
""
]
] | Fermion-boson stars are mixtures of the ordinary nuclear matter of a neutron star and bosonic dark matter. We dynamically evolve fermion-boson stars for the first time using a realistic equation of state for nuclear matter. We use our dynamical solutions to make a detailed study of the evolution of weakly and strongly ... |
2403.10463 | Haidar Sheikhahmadi | Hassan Firouzjahi, Haidar Sheikhahmadi | Vacuum zero point energy of self-interacting quantum fields in dS
background | 21 Pages, 4 figures | Phys. Rev. D 109, 125005, 2024 | 10.1103/PhysRevD.109.125005 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider self-interacting scalar fields with a conformal coupling in the
dS background and study the quantum corrections from bubble loop diagrams.
Incorporating the perturbative in-in formalism, we calculate the quantum
corrections in the vacuum zero point energy and pressure of self-interacting
fields with the p... | [
{
"created": "Fri, 15 Mar 2024 16:54:24 GMT",
"version": "v1"
}
] | 2024-06-06 | [
[
"Firouzjahi",
"Hassan",
""
],
[
"Sheikhahmadi",
"Haidar",
""
]
] | We consider self-interacting scalar fields with a conformal coupling in the dS background and study the quantum corrections from bubble loop diagrams. Incorporating the perturbative in-in formalism, we calculate the quantum corrections in the vacuum zero point energy and pressure of self-interacting fields with the pot... |
1806.10539 | Maximilian Thaller | Tomohiro Harada, Maximilian Thaller | Uniqueness of static, isotropic low-pressure solutions of the
Einstein-Vlasov system | 18 pages, 4 figures | null | null | RUP-18-17 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Due to R. Beig and W. Simon (1990) there is a uniqueness theorem for static
solutions of the Einstein-Euler system which applies to fluid models whose
equation of state fulfills certain conditions. In this article it is shown that
this uniqueness theorem can be applied to isotropic Vlasov matter, if the
gravitational... | [
{
"created": "Wed, 27 Jun 2018 15:48:39 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jul 2018 17:34:46 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Jul 2018 08:29:10 GMT",
"version": "v3"
}
] | 2018-07-09 | [
[
"Harada",
"Tomohiro",
""
],
[
"Thaller",
"Maximilian",
""
]
] | Due to R. Beig and W. Simon (1990) there is a uniqueness theorem for static solutions of the Einstein-Euler system which applies to fluid models whose equation of state fulfills certain conditions. In this article it is shown that this uniqueness theorem can be applied to isotropic Vlasov matter, if the gravitational p... |
1805.09620 | Juho Lankinen | Juho Lankinen and Iiro Vilja | Particle decay in expanding Friedmann-Robertson-Walker universes | 9 pages, 5 figures | Phys. Rev. D 98, 045010 (2018) | 10.1103/PhysRevD.98.045010 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The lack of energy conservation introduces new particle processes in curved
spacetime that are forbidden in flat space. Therefore one has to be very
cautious about using the results calculated in Minkowskian space in early
universe applications. This is true for particle decay rates in particular,
which need to be ca... | [
{
"created": "Thu, 24 May 2018 12:01:16 GMT",
"version": "v1"
}
] | 2018-08-22 | [
[
"Lankinen",
"Juho",
""
],
[
"Vilja",
"Iiro",
""
]
] | The lack of energy conservation introduces new particle processes in curved spacetime that are forbidden in flat space. Therefore one has to be very cautious about using the results calculated in Minkowskian space in early universe applications. This is true for particle decay rates in particular, which need to be calc... |
2108.05111 | Roberto Casadio | Andrea Giusti, Silvia Buffa, Lavinia Heisenberg, and Roberto Casadio | A quantum state for the late Universe | LaTeX, 12 pages, no figures | null | 10.1016/j.physletb.2022.136900 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider the quantum description of a toy model universe in which the
Schwarzschild-de Sitter geometry emerges from the coherent state of a massless
scalar field. Although highly idealised, this simple model allows us to find
clear hints supporting the conclusion that the reaction of the de Sitter
background to th... | [
{
"created": "Wed, 11 Aug 2021 09:31:24 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jan 2022 10:47:46 GMT",
"version": "v2"
}
] | 2022-01-19 | [
[
"Giusti",
"Andrea",
""
],
[
"Buffa",
"Silvia",
""
],
[
"Heisenberg",
"Lavinia",
""
],
[
"Casadio",
"Roberto",
""
]
] | We consider the quantum description of a toy model universe in which the Schwarzschild-de Sitter geometry emerges from the coherent state of a massless scalar field. Although highly idealised, this simple model allows us to find clear hints supporting the conclusion that the reaction of the de Sitter background to the ... |
gr-qc/0611018 | Dr. Anirudh Pradhan | Raj Bali and Anirudh Pradhan | Bianchi Type III String Cosmological Models with Time Dependent Bulk
Viscosity | 11 pages, no figure | Chin. Phys. Lett.24:585-588,2007 | 10.1088/0256-307X/24/2/079 | null | gr-qc | null | Bianchi type III string cosmological models with bulk viscous fluid for
massive string are investigated. To get the determinate model of the universe,
we have assumed that the coefficient of bulk viscosity ($\xi$) is inversely
proportional to the expansion ($\theta$) in the model and expansion ($\theta$)
in the model... | [
{
"created": "Fri, 3 Nov 2006 07:17:40 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jan 2007 07:28:24 GMT",
"version": "v2"
}
] | 2009-03-19 | [
[
"Bali",
"Raj",
""
],
[
"Pradhan",
"Anirudh",
""
]
] | Bianchi type III string cosmological models with bulk viscous fluid for massive string are investigated. To get the determinate model of the universe, we have assumed that the coefficient of bulk viscosity ($\xi$) is inversely proportional to the expansion ($\theta$) in the model and expansion ($\theta$) in the model i... |
2207.00888 | Anirban Chatterjee | Anirban Chatterjee, Biswajit Jana and Abhijit Bandyopadhyay | Modified scaling in $k$-essence model in interacting dark energy - dark
matter scenario | 21 pages and 6 figures. This version has been accepted for
publication in European Physical Journal Plus | Eur. Phys. J. Plus (2022) 137, 1271 | 10.1140/epjp/s13360-022-03476-y | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | It has been shown by \textit{Scherrer and Putter et.al} that, when dynamics
of dark energy is driven by a homogeneous $k-$essence scalar field $\phi$, with
a Lagrangian of the form $L = V_0F(X)$ with a constant potential $V_0$ and $X =
\frac{1}{2}\nabla^\mu\phi \nabla_\mu\phi = \frac{1}{2}\dot{\phi}^2$, one
obtains a... | [
{
"created": "Sat, 2 Jul 2022 17:52:23 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Nov 2022 13:34:32 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Nov 2022 10:45:43 GMT",
"version": "v3"
}
] | 2022-11-24 | [
[
"Chatterjee",
"Anirban",
""
],
[
"Jana",
"Biswajit",
""
],
[
"Bandyopadhyay",
"Abhijit",
""
]
] | It has been shown by \textit{Scherrer and Putter et.al} that, when dynamics of dark energy is driven by a homogeneous $k-$essence scalar field $\phi$, with a Lagrangian of the form $L = V_0F(X)$ with a constant potential $V_0$ and $X = \frac{1}{2}\nabla^\mu\phi \nabla_\mu\phi = \frac{1}{2}\dot{\phi}^2$, one obtains a s... |
gr-qc/9309019 | null | Victor M. Villalba | Dirac spinor in a nonstationary Godel-type cosmological Universe | 6pp, IVIC-CFLE 93/04 | Mod. Phys. Lett. A8 (1993) 3011-3018 | 10.1142/S0217732393001963 | null | gr-qc | null | In the present article we solve, via separation of variables, the massless
Dirac equation in a nonstationary rotating, causal G\"odel-type cosmological
universe, having a constant rotational speed in all the points of the space. We
compute the frequency spectrum. We show that the spectrum of massless Dirac
particles ... | [
{
"created": "Thu, 16 Sep 1993 17:48:03 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Villalba",
"Victor M.",
""
]
] | In the present article we solve, via separation of variables, the massless Dirac equation in a nonstationary rotating, causal G\"odel-type cosmological universe, having a constant rotational speed in all the points of the space. We compute the frequency spectrum. We show that the spectrum of massless Dirac particles is... |
gr-qc/0505107 | Lorenzo Iorio | Lorenzo Iorio | Are we far from testing general relativity with the transiting
extrasolar planet HD 209458b `Osiris'? | LaTex2e, 11 pages, 18 references, no figures, no tables. Section 5
improved. Small corrections. To appear in New Astronomy | New Astron. 11 (2006) 490-494 | 10.1016/j.newast.2005.12.001 | null | gr-qc astro-ph | null | In this paper we investigate the possibility of measuring the general
relativistic gravitoelectric contribution P^(GE) to the orbital period P of the
transiting exoplanet HD 209458b 'Osiris'. It turns out that the predicted
magnitude of such an effect is \sim 0.1 s, while the most recent determinations
of the orbital... | [
{
"created": "Fri, 20 May 2005 10:33:36 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2005 20:22:11 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Aug 2005 16:42:07 GMT",
"version": "v3"
},
{
"created": "Mon, 7 Nov 2005 21:08:55 GMT",
"version": "v4"
},
{
"cr... | 2007-05-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | In this paper we investigate the possibility of measuring the general relativistic gravitoelectric contribution P^(GE) to the orbital period P of the transiting exoplanet HD 209458b 'Osiris'. It turns out that the predicted magnitude of such an effect is \sim 0.1 s, while the most recent determinations of the orbital p... |
0804.0833 | Peter Hogan | C. Barrabes and P. A. Hogan | On Generating Gravity Waves with Matter and Electromagnetic Waves | Latex file, 15 pages, accepted for publication in Physical Review D | Phys.Rev.D77:104014,2008 | 10.1103/PhysRevD.77.104014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If a homogeneous plane light-like shell collides head-on with a homogeneous
plane electromagnetic shock wave having a step-function profile then no
backscattered gravitational waves are produced. We demonstrate, by explicit
calculation, that if the matter is accompanied by a homogeneous plane
electromagnetic shock wa... | [
{
"created": "Sat, 5 Apr 2008 02:19:58 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Barrabes",
"C.",
""
],
[
"Hogan",
"P. A.",
""
]
] | If a homogeneous plane light-like shell collides head-on with a homogeneous plane electromagnetic shock wave having a step-function profile then no backscattered gravitational waves are produced. We demonstrate, by explicit calculation, that if the matter is accompanied by a homogeneous plane electromagnetic shock wave... |
2005.10631 | Fay\c{c}al Hammad | F. Hammad, A. Landry and K. Mathieu | A fresh look at the influence of gravity on the quantum Hall effect | 35 pages, 3 figures, references updated | Eur. Phys. J. Plus 135, 449 (2020) | 10.1140/epjp/s13360-020-00481-x | null | gr-qc cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantum Hall effect inside a gravitational field. First, we
review the influence of the gravitational field of the Earth on the quantum
Hall effect. Taking the gravitational field of the Earth to be uniform along
the vertical direction, we compute the affected quantized Hall resistivity.
Then, we investi... | [
{
"created": "Thu, 21 May 2020 13:33:43 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jun 2020 22:26:14 GMT",
"version": "v2"
}
] | 2020-07-02 | [
[
"Hammad",
"F.",
""
],
[
"Landry",
"A.",
""
],
[
"Mathieu",
"K.",
""
]
] | We study the quantum Hall effect inside a gravitational field. First, we review the influence of the gravitational field of the Earth on the quantum Hall effect. Taking the gravitational field of the Earth to be uniform along the vertical direction, we compute the affected quantized Hall resistivity. Then, we investiga... |
0805.1403 | Ernesto F. Eiroa | Ernesto F. Eiroa | Stability of thin-shell wormholes with spherical symmetry | 14 pages, 3 figures | Phys.Rev.D78:024018,2008 | 10.1103/PhysRevD.78.024018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, the stability of a general class of spherically symmetric
thin-shell wormholes is studied under perturbations preserving the symmetry.
For this purpose, the equation of state at the throat is linearized around the
static solutions. The formalism presented here is applied to dilaton wormholes
and it i... | [
{
"created": "Fri, 9 May 2008 19:48:40 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Eiroa",
"Ernesto F.",
""
]
] | In this article, the stability of a general class of spherically symmetric thin-shell wormholes is studied under perturbations preserving the symmetry. For this purpose, the equation of state at the throat is linearized around the static solutions. The formalism presented here is applied to dilaton wormholes and it is ... |
gr-qc/9307019 | Kristin Schleich | Kristin Schleich and Donald M. Witt | Generalized Sums over Histories for Quantum Gravity II. Simplicial
Conifolds | 82pp., plain TeX, To appear in Nucl. Phys. B,FF-92-2 | Nucl.Phys. B402 (1993) 469-530 | 10.1016/0550-3213(93)90650-E | null | gr-qc hep-th | null | This paper examines the issues involved with concretely implementing a sum
over conifolds in the formulation of Euclidean sums over histories for gravity.
The first step in precisely formulating any sum over topological spaces is that
one must have an algorithmically implementable method of generating a list of
all s... | [
{
"created": "Wed, 14 Jul 1993 20:57:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Schleich",
"Kristin",
""
],
[
"Witt",
"Donald M.",
""
]
] | This paper examines the issues involved with concretely implementing a sum over conifolds in the formulation of Euclidean sums over histories for gravity. The first step in precisely formulating any sum over topological spaces is that one must have an algorithmically implementable method of generating a list of all spa... |
1401.2626 | Hossein Shojaie | Amir Pouyan Khosravi Karchi and Hossein Shojaie | An FLRW Cosmology with a Chameleon Field | 13 pages, 7 figures, to appear in IJMPD | Int. J. Mod. Phys. D 25, No. 3, 1650045 (2016) | 10.1142/S0218271816500450 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this manuscript, the field equations of a chameleon field in which the
matter Lagrangian term is a general function of the scalar field as well as
matter field, are derived. The equations are then expressed in
Friedmann--Lema\^itre--Robertson--Walker~(FLRW) framework and the associated
phase portraits and a power ... | [
{
"created": "Sun, 12 Jan 2014 13:30:52 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Mar 2016 14:01:35 GMT",
"version": "v2"
}
] | 2016-03-16 | [
[
"Karchi",
"Amir Pouyan Khosravi",
""
],
[
"Shojaie",
"Hossein",
""
]
] | In this manuscript, the field equations of a chameleon field in which the matter Lagrangian term is a general function of the scalar field as well as matter field, are derived. The equations are then expressed in Friedmann--Lema\^itre--Robertson--Walker~(FLRW) framework and the associated phase portraits and a power la... |
1407.4309 | Rituparno Goswami | Maombi D. Mkenyeleye, Rituparno Goswami, Sunil D. Maharaj | Gravitational collapse of generalised Vaidya spacetime | 8 pages, 2 figures, Changes in the text, Matches the accepted version
in Physical Review D | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gravitational collapse of a generalised Vaidya spacetime in the
context of the Cosmic Censorship hypothesis. We develop a general mathematical
framework to study the conditions on the mass function so that future directed
non-spacelike geodesics can terminate at the singularity in the past. Thus our
resu... | [
{
"created": "Wed, 16 Jul 2014 13:49:38 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Sep 2014 13:59:35 GMT",
"version": "v2"
}
] | 2014-09-30 | [
[
"Mkenyeleye",
"Maombi D.",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | We study the gravitational collapse of a generalised Vaidya spacetime in the context of the Cosmic Censorship hypothesis. We develop a general mathematical framework to study the conditions on the mass function so that future directed non-spacelike geodesics can terminate at the singularity in the past. Thus our result... |
2212.03890 | Don N. Page | Don N. Page | Can Two Ultrarelativistic Objects Lose Almost All Their Energy to
Gravitational Radiation? | 29 pages, LaTeX | null | 10.1103/PhysRevD.107.064057 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In 2007 Pretorius and Khurana did "speculate that at threshold [at a critical
impact parameter], all of the kinetic energy of the system [two
ultrarelativistic black holes] is converted to gravitational waves, which can
be an arbitrarily large fraction of the total energy." However, in 2012
Sperhake, Berti, Cardoso, ... | [
{
"created": "Wed, 7 Dec 2022 19:00:03 GMT",
"version": "v1"
}
] | 2023-04-05 | [
[
"Page",
"Don N.",
""
]
] | In 2007 Pretorius and Khurana did "speculate that at threshold [at a critical impact parameter], all of the kinetic energy of the system [two ultrarelativistic black holes] is converted to gravitational waves, which can be an arbitrarily large fraction of the total energy." However, in 2012 Sperhake, Berti, Cardoso, an... |
2012.04795 | Saeed Rastgoo | Pasquale Bosso, Octavio Obreg\'on, Saeed Rastgoo, Wilfredo Yupanqui | Deformed algebra and the effective dynamics of the interior of black
holes | 24 pages, 2 figures. arXiv admin note: text overlap with
arXiv:2011.11815, v2: analysis extended, a new prescription to deal with
fiducial elements introduced, figures are slightly modified and are now in
color | Class. Quantum Grav. 38 (2021) 14, 145006 | 10.1088/1361-6382/ac025f | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the classical Hamiltonian of the interior of the Schwarzschild
black hole in Ashtekar-Barbero connection formalism. Then, inspired by
generalized uncertainty principle models, we deform the classical canonical
algebra and derive the effective dynamics of the model under this modification.
We show that suc... | [
{
"created": "Wed, 9 Dec 2020 00:09:49 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Jun 2021 15:18:35 GMT",
"version": "v2"
}
] | 2021-06-16 | [
[
"Bosso",
"Pasquale",
""
],
[
"Obregón",
"Octavio",
""
],
[
"Rastgoo",
"Saeed",
""
],
[
"Yupanqui",
"Wilfredo",
""
]
] | We consider the classical Hamiltonian of the interior of the Schwarzschild black hole in Ashtekar-Barbero connection formalism. Then, inspired by generalized uncertainty principle models, we deform the classical canonical algebra and derive the effective dynamics of the model under this modification. We show that such ... |
2110.05434 | Celia Escamilla-Rivera | Celia Escamilla-Rivera, Geovanny A. Rave-Franco and Jackson Levi Said | $f(T,B)$ cosmography for high redshifts | 16 pages, 3 figures. Version accepted in Universe | Universe 2021, 7(11) | 10.3390/universe7110441 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | In light of the statistical performance of cosmological observations, in this
work we present the cosmography in $f(T,B)$ gravity. In this scenario we found
a cosmological viable standard case that allows to reduce the degeneracy
between several $f(T,B)$ models already proposed in the literature.
Furthermore, we cons... | [
{
"created": "Mon, 11 Oct 2021 17:25:24 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Nov 2021 18:24:15 GMT",
"version": "v2"
}
] | 2021-11-17 | [
[
"Escamilla-Rivera",
"Celia",
""
],
[
"Rave-Franco",
"Geovanny A.",
""
],
[
"Said",
"Jackson Levi",
""
]
] | In light of the statistical performance of cosmological observations, in this work we present the cosmography in $f(T,B)$ gravity. In this scenario we found a cosmological viable standard case that allows to reduce the degeneracy between several $f(T,B)$ models already proposed in the literature. Furthermore, we constr... |
gr-qc/0208047 | Yuri Shtanov | Yuri Shtanov, Varun Sahni | Bouncing Braneworlds | 9 pages, 1 figure, revtex, accepted for publication in Phys. Lett. B | Phys.Lett.B557:1-6,2003 | 10.1016/S0370-2693(03)00179-5 | null | gr-qc astro-ph hep-ph hep-th | null | We study cosmological braneworld models with a single timelike extra
dimension. Such models admit the intriguing possibility that a contracting
braneworld experiences a natural bounce without ever reaching a singular state.
This feature persists in the case of anisotropic braneworlds under some
additional and not ver... | [
{
"created": "Sat, 17 Aug 2002 11:28:14 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Feb 2003 02:42:46 GMT",
"version": "v2"
},
{
"created": "Sun, 9 Feb 2003 18:41:38 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Shtanov",
"Yuri",
""
],
[
"Sahni",
"Varun",
""
]
] | We study cosmological braneworld models with a single timelike extra dimension. Such models admit the intriguing possibility that a contracting braneworld experiences a natural bounce without ever reaching a singular state. This feature persists in the case of anisotropic braneworlds under some additional and not very ... |
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