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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2209.00157 | Israel Quiros | Israel Quiros, Francisco Antonio Horta-Rangel | On the equivalence between S\'aez-Ballester theory and Einstein-scalar
field system | 12 pages, 4 eps figures. We include a demonstration of the dynamical
equivalence between SBT and EMS system based on the dynamical systems tools
applied in the FRW cosmological context. This version matches the one
accepted by the Int. J. Modern Phys. D | null | 10.1142/S0218271823500335 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we discuss a topic that comes up more often than expected: A same theory
or theoretical model arises in two different presentations which are assumed to
be actually different theories so that these are independently developed.
Sometimes this leads to an unwanted doubling of the results. In this paper we
illustra... | [
{
"created": "Wed, 31 Aug 2022 23:50:04 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Oct 2022 20:36:33 GMT",
"version": "v2"
},
{
"created": "Sat, 7 Jan 2023 02:16:27 GMT",
"version": "v3"
},
{
"created": "Tue, 7 Mar 2023 16:54:30 GMT",
"version": "v4"
}
] | 2023-05-16 | [
[
"Quiros",
"Israel",
""
],
[
"Horta-Rangel",
"Francisco Antonio",
""
]
] | Here we discuss a topic that comes up more often than expected: A same theory or theoretical model arises in two different presentations which are assumed to be actually different theories so that these are independently developed. Sometimes this leads to an unwanted doubling of the results. In this paper we illustrate... |
2207.00995 | Xing Zhang | Xing Zhang | Tests of gravitational scalar polarization and constraints of chameleon
$f(R)$ gravity from comprehensive analysis of binary pulsars | 11 pages, 5 figures, 2 tables, Phys.Rev.D accepted | Phys. Rev. D 106, 024010 (2022) | 10.1103/PhysRevD.106.024010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Chameleon $f(R)$ gravity is equivalent to a class of scalar-tensor theories
of gravity with chameleon screening mechanism allowing the theory to satisfy
local tests of gravity. Within the framework of chameleon $f(R)$, we study the
impact of the chameleon mechanism on the orbital evolution of binary pulsars,
and calc... | [
{
"created": "Sun, 3 Jul 2022 09:44:48 GMT",
"version": "v1"
}
] | 2022-07-13 | [
[
"Zhang",
"Xing",
""
]
] | Chameleon $f(R)$ gravity is equivalent to a class of scalar-tensor theories of gravity with chameleon screening mechanism allowing the theory to satisfy local tests of gravity. Within the framework of chameleon $f(R)$, we study the impact of the chameleon mechanism on the orbital evolution of binary pulsars, and calcul... |
1808.01433 | Dao-Jun Liu | Yuan-Xing Gao, Yang Huang, Dao-Jun Liu | Scalar perturbations on the background of Kerr black holes in the
quadratic dynamical Chern-Simons gravity | 26 pages, 10 figures, v2: references added, submitted to PRD; v3:
discussions on EFT included; v4: matched with the published version | Phys. Rev. D 99, 044020 (2019) | 10.1103/PhysRevD.99.044020 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the scalar perturbation on the background of a Kerr black hole in
the dynamical Chern-Simons modified gravity with a quadratic coupling between
the scalar field and Chern-Simons term. In particular, the late-time tails of
scalar perturbations are investigated numerically in time domain by using the
hyperbolo... | [
{
"created": "Sat, 4 Aug 2018 06:38:01 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Aug 2018 23:25:20 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Jan 2019 05:54:07 GMT",
"version": "v3"
},
{
"created": "Thu, 21 Feb 2019 05:38:59 GMT",
"version": "v4"
}
] | 2019-02-22 | [
[
"Gao",
"Yuan-Xing",
""
],
[
"Huang",
"Yang",
""
],
[
"Liu",
"Dao-Jun",
""
]
] | We study the scalar perturbation on the background of a Kerr black hole in the dynamical Chern-Simons modified gravity with a quadratic coupling between the scalar field and Chern-Simons term. In particular, the late-time tails of scalar perturbations are investigated numerically in time domain by using the hyperboloid... |
gr-qc/0111038 | Claudia Moreno | Claudia Moreno and Dario Nunez | Gravitational Perturbations of the Kerr black hole due to arbitrary
sources | 11 pages | International Journal of Modern Physics D, Vol. 11, No. 8 (2002)
1331-1346 | 10.1142/S0218271802002165 | null | gr-qc | null | We describe the Kerr black hole in the ingoing and outgoing Kerr-Schild
horizon penetrating coordinates. Starting from the null vector naturally
defined in these coordinates, we construct the null tetrad for each case, as
well as the corresponding geometrical quantities allowing us to explicitly
derive the field equa... | [
{
"created": "Tue, 13 Nov 2001 17:04:05 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Feb 2002 17:37:23 GMT",
"version": "v2"
}
] | 2021-05-07 | [
[
"Moreno",
"Claudia",
""
],
[
"Nunez",
"Dario",
""
]
] | We describe the Kerr black hole in the ingoing and outgoing Kerr-Schild horizon penetrating coordinates. Starting from the null vector naturally defined in these coordinates, we construct the null tetrad for each case, as well as the corresponding geometrical quantities allowing us to explicitly derive the field equati... |
1606.09460 | Alexander Pavlov E | Alexander Pavlov | Intrinsic time in Geometrodynamics: introduction and application to
Friedmann cosmology | 56 pages, 2 figures. arXiv admin note: text overlap with
arXiv:1511.00225, arXiv:1601.00472, arXiv:1511.00226 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An intrinsic local time in Geometrodynamics is obtained with using a scaled
Dirac's mapping. By addition of a background metric, one can construct a scalar
field. It is suitable to play a role of intrinsic time. Cauchy problem was
successfully solved in conformal variables because they are physical ones.
First, the i... | [
{
"created": "Thu, 30 Jun 2016 12:27:41 GMT",
"version": "v1"
}
] | 2016-07-01 | [
[
"Pavlov",
"Alexander",
""
]
] | An intrinsic local time in Geometrodynamics is obtained with using a scaled Dirac's mapping. By addition of a background metric, one can construct a scalar field. It is suitable to play a role of intrinsic time. Cauchy problem was successfully solved in conformal variables because they are physical ones. First, the int... |
1902.09985 | Louis Crane | Louis Crane | Searching for Extraterrestrial Civilizations Using gamma Ray Telescopes | 6 pages contact crane@math.ksu.edu | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate looking for black hole starships using very high energy gamma
ray telescopes. We find they would be above the threshhold of visibility
although there are many unknown factors.
| [
{
"created": "Sat, 23 Feb 2019 22:22:11 GMT",
"version": "v1"
}
] | 2019-02-27 | [
[
"Crane",
"Louis",
""
]
] | We investigate looking for black hole starships using very high energy gamma ray telescopes. We find they would be above the threshhold of visibility although there are many unknown factors. |
gr-qc/9809038 | Jorge Pullin | Rodolfo Gambini and Jorge Pullin | Nonstandard optics from quantum spacetime | 4 pages, RevTeX, no figures | Phys.Rev. D59 (1999) 124021 | 10.1103/PhysRevD.59.124021 | CGPG-98/9-1 | gr-qc | null | We study light propagation in the picture of semi-classical space-time that
emerges in canonical quantum gravity in the loop representation. In such
picture, where space-time exhibits a polymer-like structure at microscales, it
is natural to expect departures from the perfect non-dispersiveness of ordinary
vacuum. We... | [
{
"created": "Wed, 9 Sep 1998 21:18:45 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
]
] | We study light propagation in the picture of semi-classical space-time that emerges in canonical quantum gravity in the loop representation. In such picture, where space-time exhibits a polymer-like structure at microscales, it is natural to expect departures from the perfect non-dispersiveness of ordinary vacuum. We e... |
1510.02945 | Lorenzo Iorio | Donato Bini, Lorenzo Iorio, Domenico Giordano | Orbital effects due to gravitational induction | LaTex2e, 16 pages, 1 figure, 2 tables, 35 references. To appear in
General Relativity and Gravitation (GRG) | Gen. Relativ. Gravit. 47:130,2015 | 10.1007/s10714-015-1977-2 | null | gr-qc astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the motion of test particles in the metric of a localized and slowly
rotating astronomical source, within the framework of linear
gravitoelectromagnetism, grounded on a Post-Minkowskian approximation of
general relativity. Special attention is paid to gravitational inductive
effects due to time-varying gravi... | [
{
"created": "Sat, 10 Oct 2015 14:39:42 GMT",
"version": "v1"
}
] | 2015-10-14 | [
[
"Bini",
"Donato",
""
],
[
"Iorio",
"Lorenzo",
""
],
[
"Giordano",
"Domenico",
""
]
] | We study the motion of test particles in the metric of a localized and slowly rotating astronomical source, within the framework of linear gravitoelectromagnetism, grounded on a Post-Minkowskian approximation of general relativity. Special attention is paid to gravitational inductive effects due to time-varying gravito... |
2209.07328 | Oem Trivedi | Oem Trivedi | Type V singularities with inhomogeneous equations of state | v2 , 20 pages with some references added, matches the published
version in PLB | Physics Letters B, 137494 , 2022 | 10.1016/j.physletb.2022.137494 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Interest in cosmological singularities has remarkably grown in recent times,
particularly on future singularities with the discovery of late-time
acceleration of the universe and dark energy. Recent work has seen a proper
classification of such singularities into strong and weak based on their
strength, with weak sin... | [
{
"created": "Thu, 15 Sep 2022 14:36:53 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Oct 2022 17:52:25 GMT",
"version": "v2"
}
] | 2022-10-11 | [
[
"Trivedi",
"Oem",
""
]
] | Interest in cosmological singularities has remarkably grown in recent times, particularly on future singularities with the discovery of late-time acceleration of the universe and dark energy. Recent work has seen a proper classification of such singularities into strong and weak based on their strength, with weak singu... |
1701.00710 | Edvard Mortsell | Edvard Mortsell | Cosmological histories in bimetric gravity: A graphical approach | 17 pages, 4 figures. Matches version published in JCAP | JCAP02(2017)051 | 10.1088/1475-7516/2017/02/051 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The bimetric generalization of general relativity has been proven to be able
to give an accelerated background expansion consistent with observations. Apart
from the energy densities coupling to one or both of the metrics, the expansion
will depend on the cosmological constant contribution to each of them, as well
as... | [
{
"created": "Mon, 2 Jan 2017 14:20:16 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Mar 2017 13:40:14 GMT",
"version": "v2"
}
] | 2017-03-08 | [
[
"Mortsell",
"Edvard",
""
]
] | The bimetric generalization of general relativity has been proven to be able to give an accelerated background expansion consistent with observations. Apart from the energy densities coupling to one or both of the metrics, the expansion will depend on the cosmological constant contribution to each of them, as well as t... |
gr-qc/0207066 | Peter B. Groves | Peter B. Groves, Paul R. Anderson, and Eric D. Carlson | Method to compute the stress-energy tensor for the massless spin 1/2
field in a general static spherically symmetric spacetime | 34 pages, no figures | Phys.Rev.D66:124017,2002 | 10.1103/PhysRevD.66.124017 | null | gr-qc hep-ph hep-th | null | A method for computing the stress-energy tensor for the quantized, massless,
spin 1/2 field in a general static spherically symmetric spacetime is
presented. The field can be in a zero temperature state or a non-zero
temperature thermal state. An expression for the full renormalized
stress-energy tensor is derived. I... | [
{
"created": "Thu, 18 Jul 2002 19:29:02 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Groves",
"Peter B.",
""
],
[
"Anderson",
"Paul R.",
""
],
[
"Carlson",
"Eric D.",
""
]
] | A method for computing the stress-energy tensor for the quantized, massless, spin 1/2 field in a general static spherically symmetric spacetime is presented. The field can be in a zero temperature state or a non-zero temperature thermal state. An expression for the full renormalized stress-energy tensor is derived. It ... |
gr-qc/9912081 | Kerstin E. Kunze | Kerstin E. Kunze, Ruth Durrer | Anisotropic 'hairs' in string cosmology | 4 pages, 1 figure | Class.Quant.Grav.17:2597-2604,2000 | 10.1088/0264-9381/17/13/311 | null | gr-qc astro-ph hep-th | null | In this letter we investigate whether the isotropy problem is naturally
solved in inflationary cosmologies inspired by string theory, so called
pre-big-bang cosmologies. We find that, in contrast to what happens in the more
common 'potential inflation' models, initial anisotropies do not decay during
pre-big-bang inf... | [
{
"created": "Mon, 20 Dec 1999 14:03:03 GMT",
"version": "v1"
}
] | 2012-10-23 | [
[
"Kunze",
"Kerstin E.",
""
],
[
"Durrer",
"Ruth",
""
]
] | In this letter we investigate whether the isotropy problem is naturally solved in inflationary cosmologies inspired by string theory, so called pre-big-bang cosmologies. We find that, in contrast to what happens in the more common 'potential inflation' models, initial anisotropies do not decay during pre-big-bang infla... |
2403.08529 | Danilo Rakonjac | B. Cvetkovi\'c and D. Rakonjac | Near horizon symmetry of extremal spacelike-stretched black holes | LaTeX, 11 pages | Phys.Rev.D 109 (2024) 12, 124043 | 10.1103/PhysRevD.109.124043 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the near horizon structure of the extremal spacelike stretched
black holes, exact solutions of topologically massive gravity. We show that the
algebra of improved canonical generator is realized as a single centrally
extended Virasoro algebra. We obtain the entropy of the solution by using the
Cardy formul... | [
{
"created": "Wed, 13 Mar 2024 13:39:48 GMT",
"version": "v1"
}
] | 2024-08-09 | [
[
"Cvetković",
"B.",
""
],
[
"Rakonjac",
"D.",
""
]
] | We analyze the near horizon structure of the extremal spacelike stretched black holes, exact solutions of topologically massive gravity. We show that the algebra of improved canonical generator is realized as a single centrally extended Virasoro algebra. We obtain the entropy of the solution by using the Cardy formula ... |
gr-qc/9805002 | Metin Gurses | Metin Gurses (Bilkent University) | Sources for the Majumdar-Papapetrou Space-Times | RevTex, 4pp, to be published in Physical Review D | Phys.Rev. D58 (1998) 044001 | 10.1103/PhysRevD.58.044001 | null | gr-qc | null | Einstein's field equations are solved exactly for static charged dust
distributions. These solutions generalize the Majumdar Papapetrou metrics.
Maxwell's equations lead to the equality of charge and mass densities of the
dust distribution. Einstein's equatins reduce to a nonlinear version of
Poisson's equation.
| [
{
"created": "Fri, 1 May 1998 05:54:52 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gurses",
"Metin",
"",
"Bilkent University"
]
] | Einstein's field equations are solved exactly for static charged dust distributions. These solutions generalize the Majumdar Papapetrou metrics. Maxwell's equations lead to the equality of charge and mass densities of the dust distribution. Einstein's equatins reduce to a nonlinear version of Poisson's equation. |
2009.04360 | John W. Moffat | J. W. Moffat | Modified Gravitation Theory (MOG) and the aLIGO GW190521 Gravitational
Wave Event | 5 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A consequence of adopting a modified gravitational theory (MOG) for the aLIGO
GW190521 gravitational wave detection involving binary black hole sources is to
fit the aLIGO strain and chirp data with lower mass, compact coalescing binary
systems such as neutron star-neutron star (NS-NS), black hole - neutron star
(BH-... | [
{
"created": "Wed, 9 Sep 2020 15:29:26 GMT",
"version": "v1"
}
] | 2020-09-10 | [
[
"Moffat",
"J. W.",
""
]
] | A consequence of adopting a modified gravitational theory (MOG) for the aLIGO GW190521 gravitational wave detection involving binary black hole sources is to fit the aLIGO strain and chirp data with lower mass, compact coalescing binary systems such as neutron star-neutron star (NS-NS), black hole - neutron star (BH-NS... |
1502.07211 | Fatimah Shojai | F. Shojai, M.R. Fazel, A. Estepanian, M. Kohandel | On the Newtonian Anisotropic Configurations | null | Eur. Phys. J. C (2015) 75:250 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we are concerned with the effects of anisotropic pressure on
the boundary conditions of anisotropic Lane-Emden equation and homology
theorem. Some new exact solutions of this equation are derived. Then some of
the theorems governing the Newtonian perfect fluid star are extended taking the
anisotropic pr... | [
{
"created": "Wed, 25 Feb 2015 15:44:50 GMT",
"version": "v1"
}
] | 2015-07-10 | [
[
"Shojai",
"F.",
""
],
[
"Fazel",
"M. R.",
""
],
[
"Estepanian",
"A.",
""
],
[
"Kohandel",
"M.",
""
]
] | In this paper we are concerned with the effects of anisotropic pressure on the boundary conditions of anisotropic Lane-Emden equation and homology theorem. Some new exact solutions of this equation are derived. Then some of the theorems governing the Newtonian perfect fluid star are extended taking the anisotropic pres... |
2111.00806 | Maciej Kolanowski | Maciej Kolanowski | Towards the black hole uniqueness: transverse deformations of the
extremal Reissner-Nordstr\"{o}m-(A)dS horizon | 14 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study all transverse deformations of the extremal
Reissner-Nordstr\"{o}m-(A)dS horizon in the Einstein-Maxwell theory. No
symmetry assumptions are needed. It is shown that for the generic values of the
charge, the only allowed deformation is spherically symmetric. However, it is
shown that for fine-tuned values of... | [
{
"created": "Mon, 1 Nov 2021 10:19:55 GMT",
"version": "v1"
}
] | 2021-11-02 | [
[
"Kolanowski",
"Maciej",
""
]
] | We study all transverse deformations of the extremal Reissner-Nordstr\"{o}m-(A)dS horizon in the Einstein-Maxwell theory. No symmetry assumptions are needed. It is shown that for the generic values of the charge, the only allowed deformation is spherically symmetric. However, it is shown that for fine-tuned values of a... |
2011.07870 | Jamie Bamber | Jamie Bamber, Katy Clough, Pedro G. Ferreira, Lam Hui and Macarena
Lagos | Growth of accretion driven scalar hair around Kerr black holes | 21 pages, 24 figures | Phys. Rev. D 103, 044059 (2021) | 10.1103/PhysRevD.103.044059 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar fields around compact objects are of interest for scalar-tensor
theories of gravity and dark matter models consisting of a massive scalar, e.g.
axions. We study the behaviour of a scalar field around a Kerr black hole with
non trivial asymptotic boundary conditions - both non zero density and non zero
angular ... | [
{
"created": "Mon, 16 Nov 2020 11:17:05 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Mar 2021 14:57:22 GMT",
"version": "v2"
}
] | 2021-03-12 | [
[
"Bamber",
"Jamie",
""
],
[
"Clough",
"Katy",
""
],
[
"Ferreira",
"Pedro G.",
""
],
[
"Hui",
"Lam",
""
],
[
"Lagos",
"Macarena",
""
]
] | Scalar fields around compact objects are of interest for scalar-tensor theories of gravity and dark matter models consisting of a massive scalar, e.g. axions. We study the behaviour of a scalar field around a Kerr black hole with non trivial asymptotic boundary conditions - both non zero density and non zero angular mo... |
1404.7512 | Leonardo Gualtieri | L. Gualtieri, E. M. Kantor, M. E. Gusakov, A. I. Chugunov | Quasi-normal modes of superfluid neutron stars | 16 pages, 7 figures, 2 tables | Phys. Rev. D 90, 024010 (2014) | 10.1103/PhysRevD.90.024010 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study non-radial oscillations of neutron stars with superfluid baryons, in
a general relativistic framework, including finite temperature effects. Using a
perturbative approach, we derive the equations describing stellar oscillations,
which we solve by numerical integration, employing different models of nucleon
s... | [
{
"created": "Tue, 29 Apr 2014 20:09:41 GMT",
"version": "v1"
}
] | 2014-07-09 | [
[
"Gualtieri",
"L.",
""
],
[
"Kantor",
"E. M.",
""
],
[
"Gusakov",
"M. E.",
""
],
[
"Chugunov",
"A. I.",
""
]
] | We study non-radial oscillations of neutron stars with superfluid baryons, in a general relativistic framework, including finite temperature effects. Using a perturbative approach, we derive the equations describing stellar oscillations, which we solve by numerical integration, employing different models of nucleon sup... |
gr-qc/0409005 | Gustavo Dotti | Gustavo Dotti and Reinaldo J. Gleiser | Gravitational instability of Einstein-Gauss-Bonnet black holes under
tensor mode perturbations | 7 pages, 1 figure, minor corrections, references added | Class.Quant.Grav. 22 (2005) L1 | 10.1088/0264-9381/22/1/L01 | null | gr-qc hep-th | null | We analyze the tensor mode perturbations of static, spherically symmetric
solutions of the Einstein equations with a quadratic Gauss-Bonnet term in
dimension $D > 4$. We show that the evolution equations for this type of
perturbations can be cast in a Regge-Wheeler-Zerilli form, and obtain the exact
potential for the... | [
{
"created": "Wed, 1 Sep 2004 19:49:07 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Sep 2004 19:57:39 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Dotti",
"Gustavo",
""
],
[
"Gleiser",
"Reinaldo J.",
""
]
] | We analyze the tensor mode perturbations of static, spherically symmetric solutions of the Einstein equations with a quadratic Gauss-Bonnet term in dimension $D > 4$. We show that the evolution equations for this type of perturbations can be cast in a Regge-Wheeler-Zerilli form, and obtain the exact potential for the c... |
gr-qc/9208009 | null | R. Brandenberger(Brown), T.Prokopec(Brown), V. Mukhanov(ETH, Zurich) | The Entropy of the Gravitational Field | 40 pages, uses REVTEX | Phys.Rev. D48 (1993) 2443-2455 | 10.1103/PhysRevD.48.2443 | Brown-HET-849 | gr-qc astro-ph hep-th | null | We derive a formula for the nonequilibrium entropy of a classical stochastic
field in terms of correlation functions of this field. The formalism is then
applied to define the entropy of gravitational perturbations (both
gravitational waves and density fluctuations). We calculate this entropy in a
specific cosmologic... | [
{
"created": "Thu, 20 Aug 1992 13:02:29 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Brandenberger",
"R.",
"",
"Brown"
],
[
"Prokopec",
"T.",
"",
"Brown"
],
[
"Mukhanov",
"V.",
"",
"ETH, Zurich"
]
] | We derive a formula for the nonequilibrium entropy of a classical stochastic field in terms of correlation functions of this field. The formalism is then applied to define the entropy of gravitational perturbations (both gravitational waves and density fluctuations). We calculate this entropy in a specific cosmological... |
1110.6030 | Kirill Bronnikov | K. A. Bronnikov and E. V. Donskoy | Black universes with trapped ghosts | 5 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1001.3511 | Grav. Cosmol. 17 (2), 176-180 (2011) | 10.1134/S0202289311020083 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A black universe is a nonsingular black hole where, beyond the horizon, there
is an expanding, asymptotically isotropic universe. Such models have been
previously found as solutions of general relativity with a phantom scalar field
as a source of gravity and, without phantoms, in a brane world of RS2 type.
Here we co... | [
{
"created": "Thu, 27 Oct 2011 09:44:32 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Donskoy",
"E. V.",
""
]
] | A black universe is a nonsingular black hole where, beyond the horizon, there is an expanding, asymptotically isotropic universe. Such models have been previously found as solutions of general relativity with a phantom scalar field as a source of gravity and, without phantoms, in a brane world of RS2 type. Here we cons... |
1209.1722 | Laszlo Arpad Gergely | M\'arton T\'apai, Zolt\'an Keresztes, L\'aszl\'o \'Arp\'ad Gergely | Spin-dominated waveforms for unequal mass compact binaries | 14 pages, 2 figures, 5 tables, published version | Phys.Rev.D86:104045,2012 | 10.1103/PhysRevD.86.104045 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive spin-dominated waveforms (SDW) for binary systems composed of
spinning black holes with unequal masses (less than 1:30). Such systems could
be formed by an astrophysical black hole with a smaller black hole or a neutron
star companion; and typically arise for supermassive black hole encounters. SDW
characte... | [
{
"created": "Sat, 8 Sep 2012 15:03:47 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Nov 2012 11:22:30 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Tápai",
"Márton",
""
],
[
"Keresztes",
"Zoltán",
""
],
[
"Gergely",
"László Árpád",
""
]
] | We derive spin-dominated waveforms (SDW) for binary systems composed of spinning black holes with unequal masses (less than 1:30). Such systems could be formed by an astrophysical black hole with a smaller black hole or a neutron star companion; and typically arise for supermassive black hole encounters. SDW characteri... |
1005.2466 | Jingfei Zhang | Xiang-Lai Liu, Jingfei Zhang, Xin Zhang | Theoretical Limits on Agegraphic Quintessence from Weak Gravity
Conjecture | 14 pages, 3 figures | Phys.Lett.B689:139-144,2010 | 10.1016/j.physletb.2010.04.067 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the possible theoretical constraint on the
parameter $n$ of the agegraphic quintessence model by considering the
requirement of the weak gravity conjecture that the variation of the
quintessence scalar field $\phi$ should be less than the Planck mass
$M_{\rm{p}}$. We obtain the theoretic... | [
{
"created": "Fri, 14 May 2010 07:31:03 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Liu",
"Xiang-Lai",
""
],
[
"Zhang",
"Jingfei",
""
],
[
"Zhang",
"Xin",
""
]
] | In this paper, we investigate the possible theoretical constraint on the parameter $n$ of the agegraphic quintessence model by considering the requirement of the weak gravity conjecture that the variation of the quintessence scalar field $\phi$ should be less than the Planck mass $M_{\rm{p}}$. We obtain the theoretical... |
1512.09166 | Laur J\"arv | Laur Jarv, Piret Kuusk, Margus Saal, Ott Vilson | The formalism of invariants in scalar-tensor and multiscalar-tensor
theories of gravitation | 6 pages; contributed to the proceedings of the 14th Marcel Grossmann
Meeting on General Relativity, parallel session AT1 | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a brief summary of the formalism of invariants in general
scalar-tensor and multiscalar-tensor gravities without derivative couplings. By
rescaling of the metric and reparametrization of the scalar fields, the theory
can be presented in different conformal frames and parametrizations. Due to
this freedom in t... | [
{
"created": "Wed, 30 Dec 2015 22:07:45 GMT",
"version": "v1"
}
] | 2016-01-01 | [
[
"Jarv",
"Laur",
""
],
[
"Kuusk",
"Piret",
""
],
[
"Saal",
"Margus",
""
],
[
"Vilson",
"Ott",
""
]
] | We give a brief summary of the formalism of invariants in general scalar-tensor and multiscalar-tensor gravities without derivative couplings. By rescaling of the metric and reparametrization of the scalar fields, the theory can be presented in different conformal frames and parametrizations. Due to this freedom in tra... |
gr-qc/0406009 | Malik Rakhmanov | Malik Rakhmanov | The Response of Test Masses to Gravitational Waves in the Coordinates of
a Local Observer | 25 pages, 3 figures, Latex2e | null | 10.1103/PhysRevD.71.084003 | LIGO-P030056 | gr-qc | null | The response of laser interferometers to gravitational waves has been
calculated in a number of different ways, particularly in the
transverse-traceless and the local Lorentz gauges. At first sight, it would
appear that these calculations lead to different results when the separation
between the test masses becomes c... | [
{
"created": "Thu, 3 Jun 2004 01:05:50 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Rakhmanov",
"Malik",
""
]
] | The response of laser interferometers to gravitational waves has been calculated in a number of different ways, particularly in the transverse-traceless and the local Lorentz gauges. At first sight, it would appear that these calculations lead to different results when the separation between the test masses becomes com... |
1812.03550 | Marco Finocchiaro | Marco Finocchiaro, Daniele Oriti | Spin foam models and the Duflo map | 20 pages, 2 figures | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a general definition of spin foam models, and then of models of 4d
quantum gravity based on constraining BF theory. We highlight the construction
and quantization ambiguities entering model building, among which the choice of
quantization map applied to the B variables carrying metric information after
imposi... | [
{
"created": "Sun, 9 Dec 2018 19:44:25 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jun 2019 09:57:44 GMT",
"version": "v2"
}
] | 2019-06-19 | [
[
"Finocchiaro",
"Marco",
""
],
[
"Oriti",
"Daniele",
""
]
] | We give a general definition of spin foam models, and then of models of 4d quantum gravity based on constraining BF theory. We highlight the construction and quantization ambiguities entering model building, among which the choice of quantization map applied to the B variables carrying metric information after imposing... |
2312.11450 | Javier Olmedo | Florencia Benitez, Esteban Mato and Javier Olmedo | Analysis of improved dynamics of non-rotating charged black holes | 18 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide the quantization of a charged black hole. We consider a
redefinition of the scalar constraint in order to render the algebra of
constraints as a Lie algebra. We apply loop quantum gravity techniques adhered
to a novel improved dynamics scheme. We show that the model is solvable in
closed form. We compute e... | [
{
"created": "Mon, 18 Dec 2023 18:53:35 GMT",
"version": "v1"
}
] | 2023-12-19 | [
[
"Benitez",
"Florencia",
""
],
[
"Mato",
"Esteban",
""
],
[
"Olmedo",
"Javier",
""
]
] | We provide the quantization of a charged black hole. We consider a redefinition of the scalar constraint in order to render the algebra of constraints as a Lie algebra. We apply loop quantum gravity techniques adhered to a novel improved dynamics scheme. We show that the model is solvable in closed form. We compute eff... |
1901.01265 | Andrea Maselli | Vitor Cardoso, Masashi Kimura, Andrea Maselli, Emanuele Berti, Caio F.
B. Macedo, Ryan McManus | Parametrized black hole quasinormal ringdown. I. Decoupled equations for
nonrotating black holes | typo corrected in Eq.(34) to match the published version | Phys. Rev. D 99, 104077 (2019) | 10.1103/PhysRevD.99.104077 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole solutions in general relativity are simple. The frequency spectrum
of linear perturbations around these solutions (i.e., the quasinormal modes) is
also simple, and therefore it is a prime target for fundamental tests of black
hole spacetimes and of the underlying theory of gravity. The following
technical ... | [
{
"created": "Fri, 4 Jan 2019 19:00:06 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Feb 2024 02:50:09 GMT",
"version": "v2"
}
] | 2024-02-09 | [
[
"Cardoso",
"Vitor",
""
],
[
"Kimura",
"Masashi",
""
],
[
"Maselli",
"Andrea",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Macedo",
"Caio F. B.",
""
],
[
"McManus",
"Ryan",
""
]
] | Black hole solutions in general relativity are simple. The frequency spectrum of linear perturbations around these solutions (i.e., the quasinormal modes) is also simple, and therefore it is a prime target for fundamental tests of black hole spacetimes and of the underlying theory of gravity. The following technical ca... |
2008.00789 | Patrick Meyers | Patrick M. Meyers, Katarina Martinovic, Nelson Christensen, Mairi
Sakellariadou | Detecting a stochastic gravitational-wave background in the presence of
correlated magnetic noise | 14 pages, 9 figures | Phys. Rev. D 102, 102005 (2020) | 10.1103/PhysRevD.102.102005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A detection of the stochastic gravitational-wave background (SGWB) from
unresolved compact binary coalescences could be made by Advanced LIGO and
Advanced Virgo at their design sensitivities. However, it is possible for
magnetic noise that is correlated between spatially separated ground-based
detectors to mimic a SG... | [
{
"created": "Mon, 3 Aug 2020 11:44:04 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Oct 2020 05:00:31 GMT",
"version": "v2"
}
] | 2020-11-18 | [
[
"Meyers",
"Patrick M.",
""
],
[
"Martinovic",
"Katarina",
""
],
[
"Christensen",
"Nelson",
""
],
[
"Sakellariadou",
"Mairi",
""
]
] | A detection of the stochastic gravitational-wave background (SGWB) from unresolved compact binary coalescences could be made by Advanced LIGO and Advanced Virgo at their design sensitivities. However, it is possible for magnetic noise that is correlated between spatially separated ground-based detectors to mimic a SGWB... |
1607.03388 | Yu-Xiao Liu | Hao Yu, Bao-Min Gu, Fa Peng Huang, Yong-Qiang Wang, Xin-He Meng,
Yu-Xiao Liu | Probing extra dimension through gravitational wave observations of
compact binaries and their electromagnetic counterparts | v3: 25 pages, 4 figures and 4 tables, improved version, accepted by
JCAP | JCAP 1702 (2017) 039 | 10.1088/1475-7516/2017/02/039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The future gravitational wave (GW) observations of compact binaries and their
possible electromagnetic counterparts may be used to probe the nature of the
extra dimension. It is widely accepted that gravitons and photons are the only
two completely confirmed objects that can travel along null geodesics in our
four-di... | [
{
"created": "Tue, 12 Jul 2016 15:03:16 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Aug 2016 12:40:19 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Feb 2017 01:41:10 GMT",
"version": "v3"
}
] | 2017-02-23 | [
[
"Yu",
"Hao",
""
],
[
"Gu",
"Bao-Min",
""
],
[
"Huang",
"Fa Peng",
""
],
[
"Wang",
"Yong-Qiang",
""
],
[
"Meng",
"Xin-He",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | The future gravitational wave (GW) observations of compact binaries and their possible electromagnetic counterparts may be used to probe the nature of the extra dimension. It is widely accepted that gravitons and photons are the only two completely confirmed objects that can travel along null geodesics in our four-dime... |
2408.06605 | Pardyumn Kumar Sahoo | Sneha Pradhan, Zinnat Hassan, P.K. Sahoo | Wormhole Geometries Supported by Strange Quark Matter and Phantom-like
Generalized Chaplygin gas within $f(Q)$ Gravity | Physics of the Dark Universe published version | Physics of the Dark Universe (2024) 101620 | 10.1016/j.dark.2024.101620 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | A crucial aspect of wormhole (WH) physics is the inclusion of exotic matter,
which requires violating the null energy condition. Here, we explore the
potential for WHs to be sustained by quark matter under conditions of extreme
density along with the phantom-like generalized cosmic Chaplygin gas (GCCG) in
symmetric t... | [
{
"created": "Tue, 13 Aug 2024 03:37:30 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Aug 2024 10:05:01 GMT",
"version": "v2"
}
] | 2024-08-15 | [
[
"Pradhan",
"Sneha",
""
],
[
"Hassan",
"Zinnat",
""
],
[
"Sahoo",
"P. K.",
""
]
] | A crucial aspect of wormhole (WH) physics is the inclusion of exotic matter, which requires violating the null energy condition. Here, we explore the potential for WHs to be sustained by quark matter under conditions of extreme density along with the phantom-like generalized cosmic Chaplygin gas (GCCG) in symmetric tel... |
1412.7576 | Sebastian Fortin Dr. | Mario Castagnino, Sebastian Fortin, Roberto Laura and Daniel Sudarsky | Interpretations of Quantum Theory in the Light of Modern Cosmology | 25 pages | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The difficult issues related to the interpretation of quantum mechanics and,
in particular, the "measurement problem" are revisited using as motivation the
process of generation of structure from quantum fluctuations in inflationary
cosmology. The unessential mathematical complexity of the particular problem is
bypas... | [
{
"created": "Wed, 24 Dec 2014 00:42:01 GMT",
"version": "v1"
}
] | 2014-12-25 | [
[
"Castagnino",
"Mario",
""
],
[
"Fortin",
"Sebastian",
""
],
[
"Laura",
"Roberto",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | The difficult issues related to the interpretation of quantum mechanics and, in particular, the "measurement problem" are revisited using as motivation the process of generation of structure from quantum fluctuations in inflationary cosmology. The unessential mathematical complexity of the particular problem is bypasse... |
0710.2041 | Claudio Simeone | Martin Richarte, Claudio Simeone | Thin-shell wormholes supported by ordinary matter in
Einstein--Gauss--Bonnet gravity | Errors corrected, conclusion still valid for different values of the
parameters. 8 pages, 3 figures | Phys.Rev.D76:087502,2007; Erratum-ibid.D77:089903,2008 | 10.1103/PhysRevD.76.087502 10.1103/PhysRevD.77.089903 | null | gr-qc astro-ph hep-th | null | The generalized Darmois--Israel formalism for Einstein--Gauss--Bonnet theory
is applied to construct thin-shell Lorentzian wormholes with spherical
symmetry. We calculate the energy localized on the shell, and we find that for
certain values of the parameters wormholes could be supported by matter not
violating the e... | [
{
"created": "Wed, 10 Oct 2007 15:27:45 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Oct 2007 13:36:28 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Mar 2008 21:34:56 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"Richarte",
"Martin",
""
],
[
"Simeone",
"Claudio",
""
]
] | The generalized Darmois--Israel formalism for Einstein--Gauss--Bonnet theory is applied to construct thin-shell Lorentzian wormholes with spherical symmetry. We calculate the energy localized on the shell, and we find that for certain values of the parameters wormholes could be supported by matter not violating the ene... |
gr-qc/0405142 | Jos\'e Wadih Maluf | J. W. Maluf and F. F. Faria | On gravitational radiation and the energy flux of matter | 22 pages, Latex file, no figures, to appear in the Annalen der Physik | Annalen Phys. 13 (2004) 604-616 | 10.1002/andp.200410097 | null | gr-qc | null | A suitable derivative of Einstein's equations in the framework of the
teleparallel equivalent of general relativity (TEGR) yields a continuity
equation for the gravitational energy-momentum. In particular, the time
derivative of the total gravitational energy is given by the sum of the total
fluxes of gravitational a... | [
{
"created": "Fri, 28 May 2004 19:55:10 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Maluf",
"J. W.",
""
],
[
"Faria",
"F. F.",
""
]
] | A suitable derivative of Einstein's equations in the framework of the teleparallel equivalent of general relativity (TEGR) yields a continuity equation for the gravitational energy-momentum. In particular, the time derivative of the total gravitational energy is given by the sum of the total fluxes of gravitational and... |
1809.05653 | Daeho Ro | Bum-Hoon Lee, Wonwoo Lee, Daeho Ro | Expanded evasion of the black hole no-hair theorem in dilatonic
Einstein-Gauss-Bonnet theory | 9 pages, 7 figures, 1 table, discussion and reference added | Phys. Rev. D 99, 024002 (2019) | 10.1103/PhysRevD.99.024002 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a hairy black hole solution in the dilatonic Einstein-Gauss-Bonnet
theory of gravitation, in which the Gauss-Bonnet term is non-minimally coupled
to the dilaton field. Hairy black holes with spherical symmetry seem to be
easily constructed with a positive Gauss-Bonnet coefficient $\alpha$ within the
coupling... | [
{
"created": "Sat, 15 Sep 2018 05:46:29 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jan 2019 13:35:20 GMT",
"version": "v2"
}
] | 2019-01-07 | [
[
"Lee",
"Bum-Hoon",
""
],
[
"Lee",
"Wonwoo",
""
],
[
"Ro",
"Daeho",
""
]
] | We study a hairy black hole solution in the dilatonic Einstein-Gauss-Bonnet theory of gravitation, in which the Gauss-Bonnet term is non-minimally coupled to the dilaton field. Hairy black holes with spherical symmetry seem to be easily constructed with a positive Gauss-Bonnet coefficient $\alpha$ within the coupling f... |
0809.4708 | C\'esar Henrique Lenzi CHL | C\'esar H. Lenzi, Nadja S. Magalh\~aes, Rubens M. Marinho Jr., C\'esar
A. Costa, Helmo A. B. Ara\'ujo, Odylio D. Aguiar | Solution of the inverse problem in spherical gravitational wave
detectors using a model with independent bars | 21 pages, 3 figures | Phys.Rev.D78:062005,2008; Erratum-ibid.D78:129901,2008 | 10.1103/PhysRevD.78.062005 10.1103/PhysRevD.78.129901 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The direct detection of gravitational waves will provide valuable
astrophysical information about many celestial objects. The SCHENBERG has
already undergone its first test run. It is expected to have its first
scientific run soon. In this work a new data analysis approach is presented,
called method of independent b... | [
{
"created": "Fri, 26 Sep 2008 20:32:52 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Dec 2008 19:30:34 GMT",
"version": "v2"
}
] | 2014-11-18 | [
[
"Lenzi",
"César H.",
""
],
[
"Magalhães",
"Nadja S.",
""
],
[
"Marinho",
"Rubens M.",
"Jr."
],
[
"Costa",
"César A.",
""
],
[
"Araújo",
"Helmo A. B.",
""
],
[
"Aguiar",
"Odylio D.",
""
]
] | The direct detection of gravitational waves will provide valuable astrophysical information about many celestial objects. The SCHENBERG has already undergone its first test run. It is expected to have its first scientific run soon. In this work a new data analysis approach is presented, called method of independent bar... |
1811.07164 | Sung-Won Kim | Sung-Won Kim | Evolution of Cosmological Horizons of Wormhole Cosmology | 18 pages, 9 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently we solved the Einstein's field equations to obtain the exact
solution of the cosmological model with the Morris-Thorne type wormhole. We
found the apparent horizons and analyzed their geometric natures, including the
causal tructures. We also derived the Hawking temperature near the apparent
cosmological hor... | [
{
"created": "Sat, 17 Nov 2018 14:21:29 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jun 2019 10:07:50 GMT",
"version": "v2"
}
] | 2019-06-21 | [
[
"Kim",
"Sung-Won",
""
]
] | Recently we solved the Einstein's field equations to obtain the exact solution of the cosmological model with the Morris-Thorne type wormhole. We found the apparent horizons and analyzed their geometric natures, including the causal tructures. We also derived the Hawking temperature near the apparent cosmological horiz... |
gr-qc/0104103 | Michael A. Clayton | M. A. Clayton | Causality, shocks and instabilities in vector field models of Lorentz
symmetry breaking | 15 pages, uses ams style files | null | null | null | gr-qc astro-ph hep-th | null | We show that that vector field-based models of the ether generically do not
have a Hamiltonian that is bounded from below in a flat spacetime. We also
demonstrate that these models possess multiple light cones in flat or curved
spacetime, and that the non-lightlike characteristic is associated with an
ether degree of... | [
{
"created": "Mon, 30 Apr 2001 21:14:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Clayton",
"M. A.",
""
]
] | We show that that vector field-based models of the ether generically do not have a Hamiltonian that is bounded from below in a flat spacetime. We also demonstrate that these models possess multiple light cones in flat or curved spacetime, and that the non-lightlike characteristic is associated with an ether degree of f... |
2104.04394 | Eugenio Bianchi | Abhay Ashtekar, Eugenio Bianchi | A Short Review of Loop Quantum Gravity | 35 pages, 6 figures; Key Issues Review commissioned by the Journal | Rep. Prog. Phys. 84, 042001 (2021) | 10.1088/1361-6633/abed91 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | An outstanding open issue in our quest for physics beyond Einstein is the
unification of general relativity (GR) and quantum physics. Loop quantum
gravity (LQG) is a leading approach toward this goal. At its heart is the
central lesson of GR: Gravity is a manifestation of spacetime geometry. Thus,
the approach emphas... | [
{
"created": "Fri, 9 Apr 2021 14:32:40 GMT",
"version": "v1"
}
] | 2021-04-12 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Bianchi",
"Eugenio",
""
]
] | An outstanding open issue in our quest for physics beyond Einstein is the unification of general relativity (GR) and quantum physics. Loop quantum gravity (LQG) is a leading approach toward this goal. At its heart is the central lesson of GR: Gravity is a manifestation of spacetime geometry. Thus, the approach emphasiz... |
1601.07928 | Avani Patel | Koushik Dutta, Sukanta Panda and Avani Patel | Viability of Arctan Model of f(R) Gravity for Late-time Cosmology | 7 pages, 4 figures, 1 table | Phys. Rev. D 94, 024016 (2016) | 10.1103/PhysRevD.94.024016 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | $f(R)$ modifications of Einstein's gravity is an interesting possibility to
explain the late time acceleration of the Universe. In this work we explore the
cosmological viability of one such $f(R)$ modification proposed in
(Kruglov:2013). We show that the model violates fifth-force constraints. The
model is also plag... | [
{
"created": "Wed, 27 Jan 2016 15:41:25 GMT",
"version": "v1"
}
] | 2016-07-13 | [
[
"Dutta",
"Koushik",
""
],
[
"Panda",
"Sukanta",
""
],
[
"Patel",
"Avani",
""
]
] | $f(R)$ modifications of Einstein's gravity is an interesting possibility to explain the late time acceleration of the Universe. In this work we explore the cosmological viability of one such $f(R)$ modification proposed in (Kruglov:2013). We show that the model violates fifth-force constraints. The model is also plague... |
0806.2481 | Zong-Kuan Guo | Zong-Kuan Guo, Nobuyoshi Ohta, Takashi Torii | Black Holes in the Dilatonic Einstein-Gauss-Bonnet Theory in Various
Dimensions I -- Asymptotically Flat Black Holes -- | 30 pages, 7 figures, PTPTeX, references added, accepted for
publication in PTP | Prog.Theor.Phys.120:581-607,2008 | 10.1143/PTP.120.581 | KU-TP 023 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study spherically symmetric, asymptotically flat black hole solutions in
the low-energy effective heterotic string theory, which is the Einstein gravity
with Gauss-Bonnet term and the dilaton, in various dimensions. We derive the
field equations for suitable ansatz for general D dimensions and construct
black hole... | [
{
"created": "Mon, 16 Jun 2008 01:34:07 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Aug 2008 04:10:23 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Guo",
"Zong-Kuan",
""
],
[
"Ohta",
"Nobuyoshi",
""
],
[
"Torii",
"Takashi",
""
]
] | We study spherically symmetric, asymptotically flat black hole solutions in the low-energy effective heterotic string theory, which is the Einstein gravity with Gauss-Bonnet term and the dilaton, in various dimensions. We derive the field equations for suitable ansatz for general D dimensions and construct black hole s... |
0706.2444 | Hyung Won Lee | Kyoung Yee Kim, Hyung Won Lee and Yun Soo Myung | Holographic interacting dark energy in the braneworld cosmology | 17 pages, 4 figures | Mod.Phys.Lett.A22:2631-2645,2007 | 10.1142/S0217732307025765 | INJE-TP-07-04 | gr-qc astro-ph hep-th | null | We investigate a model of brane cosmology to find a unified description of
the radiation-matter-dark energy universe. It is of the interacting holographic
dark energy with a bulk-holographic matter $\chi$. This is a five-dimensional
cold dark matter, which plays a role of radiation on the brane. Using the
effective e... | [
{
"created": "Sat, 16 Jun 2007 21:12:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kim",
"Kyoung Yee",
""
],
[
"Lee",
"Hyung Won",
""
],
[
"Myung",
"Yun Soo",
""
]
] | We investigate a model of brane cosmology to find a unified description of the radiation-matter-dark energy universe. It is of the interacting holographic dark energy with a bulk-holographic matter $\chi$. This is a five-dimensional cold dark matter, which plays a role of radiation on the brane. Using the effective equ... |
0901.1070 | Dmitri Vassiliev | James Burnett and Dmitri Vassiliev | Weyl's Lagrangian in teleparallel form | null | J. Math. Phys. 50:102501,2009 | 10.1063/1.3204975 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main result of the paper is a new representation for the Weyl Lagrangian
(massless Dirac Lagrangian). As the dynamical variable we use the coframe, i.e.
an orthonormal tetrad of covector fields. We write down a simple Lagrangian -
wedge product of axial torsion with a lightlike element of the coframe - and
show t... | [
{
"created": "Thu, 8 Jan 2009 15:38:35 GMT",
"version": "v1"
}
] | 2010-03-26 | [
[
"Burnett",
"James",
""
],
[
"Vassiliev",
"Dmitri",
""
]
] | The main result of the paper is a new representation for the Weyl Lagrangian (massless Dirac Lagrangian). As the dynamical variable we use the coframe, i.e. an orthonormal tetrad of covector fields. We write down a simple Lagrangian - wedge product of axial torsion with a lightlike element of the coframe - and show tha... |
2407.19268 | Manabendra Sharma | Gaurav Bhandari, S. D. Pathak, Manabendra Sharma, Maxim Yu Khlopov | Quantum Gravity Corrections to Hawking Radiation via GUP | 7 pages, 1 figure | null | null | null | gr-qc astro-ph.HE math-ph math.MP quant-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper we explore the effects of a Generalized Uncertainty Principle
(GUP) on Schwarzschild black hole. In particular, we incorporate the effects of
GUP into the Parikh-Wilczek tunneling process for Hawking radiation. To this
effect, we observe that results obtained due to GUP correction resemble that of
the R... | [
{
"created": "Sat, 27 Jul 2024 14:25:20 GMT",
"version": "v1"
}
] | 2024-07-30 | [
[
"Bhandari",
"Gaurav",
""
],
[
"Pathak",
"S. D.",
""
],
[
"Sharma",
"Manabendra",
""
],
[
"Khlopov",
"Maxim Yu",
""
]
] | In this paper we explore the effects of a Generalized Uncertainty Principle (GUP) on Schwarzschild black hole. In particular, we incorporate the effects of GUP into the Parikh-Wilczek tunneling process for Hawking radiation. To this effect, we observe that results obtained due to GUP correction resemble that of the Rei... |
0710.5373 | George E. A. Matsas | Luis C. B. Crispino, Atsushi Higuchi and George E. A. Matsas | The Unruh effect and its applications | 53 pages, 11 figures, submitted to Reviews of Modern Physics | Rev.Mod.Phys.80:787-838,2008 | 10.1103/RevModPhys.80.787 | null | gr-qc hep-th | null | It has been thirty years since the discovery of the Unruh effect. It has
played a crucial role in our understanding that the particle content of a field
theory is observer dependent. This effect is important in its own right and as
a way to understand the phenomenon of particle emission from black holes and
cosmologi... | [
{
"created": "Mon, 29 Oct 2007 10:21:08 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Crispino",
"Luis C. B.",
""
],
[
"Higuchi",
"Atsushi",
""
],
[
"Matsas",
"George E. A.",
""
]
] | It has been thirty years since the discovery of the Unruh effect. It has played a crucial role in our understanding that the particle content of a field theory is observer dependent. This effect is important in its own right and as a way to understand the phenomenon of particle emission from black holes and cosmologica... |
1604.02261 | Rodrigo Panosso Macedo | Marcus Ansorg, Rodrigo Panosso Macedo | Spectral decomposition of black-hole perturbations on hyperboloidal
slices | Match published version | Phys. Rev. D 93, 124016 (2016) | 10.1103/PhysRevD.93.124016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present a spectral decomposition of solutions to
relativistic wave equations described on horizon penetrating hyperboloidal
slices within a given Schwarzschild-black-hole background. The wave equa- tion
in question is Laplace-transformed which leads to a spatial differential
equation with a complex p... | [
{
"created": "Fri, 8 Apr 2016 07:53:04 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Jul 2016 18:37:25 GMT",
"version": "v2"
}
] | 2016-07-28 | [
[
"Ansorg",
"Marcus",
""
],
[
"Macedo",
"Rodrigo Panosso",
""
]
] | In this paper we present a spectral decomposition of solutions to relativistic wave equations described on horizon penetrating hyperboloidal slices within a given Schwarzschild-black-hole background. The wave equa- tion in question is Laplace-transformed which leads to a spatial differential equation with a complex par... |
1808.08004 | Prayush Kumar | Prayush Kumar, Jonathan Blackman, Scott E. Field, Mark Scheel, Chad R.
Galley, Michael Boyle, Lawrence E. Kidder, Harald P. Pfeiffer, Bela Szilagyi,
Saul A. Teukolsky | Constraining the parameters of GW150914 & GW170104 with numerical
relativity surrogates | 20 pages, 14 figures; Updated to published version | Phys. Rev. D 99, 124005 (2019) | 10.1103/PhysRevD.99.124005 | LIGO-P1800166 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational-wave detectors have begun to observe coalescences of heavy
black holes at a consistent pace for the past few years. Accurate models of
gravitational waveforms are essential for unbiased and precise estimation of
source parameters. Recently developed surrogate models based on high-accuracy
numerical rela... | [
{
"created": "Fri, 24 Aug 2018 05:05:45 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Apr 2020 22:45:32 GMT",
"version": "v2"
}
] | 2020-04-21 | [
[
"Kumar",
"Prayush",
""
],
[
"Blackman",
"Jonathan",
""
],
[
"Field",
"Scott E.",
""
],
[
"Scheel",
"Mark",
""
],
[
"Galley",
"Chad R.",
""
],
[
"Boyle",
"Michael",
""
],
[
"Kidder",
"Lawrence E.",
""
],
... | Gravitational-wave detectors have begun to observe coalescences of heavy black holes at a consistent pace for the past few years. Accurate models of gravitational waveforms are essential for unbiased and precise estimation of source parameters. Recently developed surrogate models based on high-accuracy numerical relati... |
1805.09867 | Masato Minamitsuji | Masato Minamitsuji | Vector boson star solutions with a quartic order self-interaction | 10 pages | Phys. Rev. D 97, 104023 (2018) | 10.1103/PhysRevD.97.104023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate boson star (BS) solutions in the Einstein-Proca theory with
the quartic order self-interaction of the vector field $\lambda
(A^\mu\bar{A}_\mu)^2/4$ and the mass term $\mu \bar{A}^\mu A_\mu/2$, where
$A_\mu$ is the complex vector field and ${\bar A}_\mu$ is the complex conjugate
of $A_\mu$, and $\lambda... | [
{
"created": "Thu, 24 May 2018 19:41:31 GMT",
"version": "v1"
}
] | 2018-05-28 | [
[
"Minamitsuji",
"Masato",
""
]
] | We investigate boson star (BS) solutions in the Einstein-Proca theory with the quartic order self-interaction of the vector field $\lambda (A^\mu\bar{A}_\mu)^2/4$ and the mass term $\mu \bar{A}^\mu A_\mu/2$, where $A_\mu$ is the complex vector field and ${\bar A}_\mu$ is the complex conjugate of $A_\mu$, and $\lambda$ ... |
2407.05172 | Masoud Ghezelbash | Joshua G. Fenwick, Masoud Ghezelbash | Exact Analytical Taub-NUT like Solution in f(T) Gravity | 10 pages | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We construct exact analytical Taub-NUT solutions in the context of $f(T)$
gravity. We study the physical properties of the solutions, and compare them
with those of the Taub-NUT solution in Einstein gravity.
| [
{
"created": "Sat, 6 Jul 2024 20:24:30 GMT",
"version": "v1"
}
] | 2024-07-09 | [
[
"Fenwick",
"Joshua G.",
""
],
[
"Ghezelbash",
"Masoud",
""
]
] | We construct exact analytical Taub-NUT solutions in the context of $f(T)$ gravity. We study the physical properties of the solutions, and compare them with those of the Taub-NUT solution in Einstein gravity. |
gr-qc/0006019 | Mohammad Vahid Takook | Mohammad Vahid Takook | Negative Norm States in de Sitter Space and QFT without Renormalization
Procedure | 9 pages, LaTeX, typos corrected, some details added. v4: (1) A
negative sign had been omitted in the equation (26), corrected of which
resulted in minor changes of section 3 and 4 and in the conclusion. (2) An
explicit calculation of the transition amplitude for s-channel contribution
in the one-loop approximat... | Int.J.Mod.Phys. E11 (2002) 509-518 | null | null | gr-qc | null | In recent papers [1,2], it has been shown that the presence of negative norm
states or negative frequency solutions are indispensable for a fully covariant
quantization of the minimally coupled scalar field in de Sitter space. Their
presence, while leaving unchanged the physical content of the theory, offers
the adva... | [
{
"created": "Tue, 6 Jun 2000 10:18:29 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2000 06:22:01 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Oct 2000 08:34:11 GMT",
"version": "v3"
},
{
"created": "Fri, 15 Nov 2002 06:38:18 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Takook",
"Mohammad Vahid",
""
]
] | In recent papers [1,2], it has been shown that the presence of negative norm states or negative frequency solutions are indispensable for a fully covariant quantization of the minimally coupled scalar field in de Sitter space. Their presence, while leaving unchanged the physical content of the theory, offers the advant... |
gr-qc/9311036 | Professor | Jaegu Kim | Gravitational Field of a Moving Spinning Point Particle | 7 pages, AMS TEX, KWTP93-2 | J.Korean Phys.Soc. 27 (1994) 479-483 | null | null | gr-qc hep-th | null | The gravitational and electromagnetic fields of a moving charged spinning
point particle are obtained in the Lorentz covariant form by transforming the
Kerr--Newman solution in Boyer--Lindquist coordinates to the one in the
coordinate system which resembles the isotropic coordinates and then
covariantizing it. It is ... | [
{
"created": "Tue, 30 Nov 1993 04:47:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kim",
"Jaegu",
""
]
] | The gravitational and electromagnetic fields of a moving charged spinning point particle are obtained in the Lorentz covariant form by transforming the Kerr--Newman solution in Boyer--Lindquist coordinates to the one in the coordinate system which resembles the isotropic coordinates and then covariantizing it. It is sh... |
gr-qc/0101081 | D. Petroff | D. Petroff and R. Meinel | The Post-Newtonian Approximation of the Rigidly Rotating Disc of Dust to
Arbitrary Order | 19 pages, 2 tables, 4 figures Accepted for publication in Phys. Rev.
D | Phys.Rev.D63:064012,2001 | 10.1103/PhysRevD.63.064012 | null | gr-qc | null | Using the analytic, global solution for the rigidly rotating disc of dust as
a starting point, an iteration scheme is presented for the calculation of an
arbitrary coefficient in the post-Newtonian (PN) approximation of this
solution. The coefficients were explicitly calculated up to the 12th PN level
and are listed ... | [
{
"created": "Fri, 19 Jan 2001 12:59:27 GMT",
"version": "v1"
}
] | 2010-12-23 | [
[
"Petroff",
"D.",
""
],
[
"Meinel",
"R.",
""
]
] | Using the analytic, global solution for the rigidly rotating disc of dust as a starting point, an iteration scheme is presented for the calculation of an arbitrary coefficient in the post-Newtonian (PN) approximation of this solution. The coefficients were explicitly calculated up to the 12th PN level and are listed in... |
2009.00846 | Gianluca Calcagni | Gianluca Calcagni | Next step in gravity and cosmology: fundamental theory or data-driven
models? | 6 pages. Specialty Grand Challenge article prepared for section
Cosmology of Frontiers in Astronomy and Space Sciences | Front. Astron. Space Sci. 7 (2020) 52 | 10.3389/fspas.2020.00052 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We comment on the difference between bottom-up (i.e., data-driven, ad hoc)
and top-down (i.e., derived from a fundamental theory of gravitational
interactions) cosmological models, their respective status, predictive power
and viability. We fuel the debate on whether present and future research on
theoretical models ... | [
{
"created": "Wed, 2 Sep 2020 06:52:09 GMT",
"version": "v1"
}
] | 2020-09-03 | [
[
"Calcagni",
"Gianluca",
""
]
] | We comment on the difference between bottom-up (i.e., data-driven, ad hoc) and top-down (i.e., derived from a fundamental theory of gravitational interactions) cosmological models, their respective status, predictive power and viability. We fuel the debate on whether present and future research on theoretical models of... |
gr-qc/0107061 | Luciano Rezzolla | Luciano Rezzolla, Frederick L. Lamb, Dragoljub Markovic, and Stuart L.
Shapiro | Properties of r modes in rotating magnetic neutron stars. I. Kinematic
Secular Effects and Magnetic Evolution Equations | 15 pages, 4 figures. To appear in Phys. Rev. D | Phys. Rev. D, 64 104013 (2001) | 10.1103/PhysRevD.64.104013 | null | gr-qc astro-ph | null | The instability of r-mode oscillations in rapidly rotating neutron stars has
attracted attention as a potential mechanism for producing high frequency,
almost periodic gravitational waves. The analyses carried so far have shown the
existence of these modes and have considered damping by shear and bulk
viscosity. Howe... | [
{
"created": "Tue, 17 Jul 2001 14:02:24 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Rezzolla",
"Luciano",
""
],
[
"Lamb",
"Frederick L.",
""
],
[
"Markovic",
"Dragoljub",
""
],
[
"Shapiro",
"Stuart L.",
""
]
] | The instability of r-mode oscillations in rapidly rotating neutron stars has attracted attention as a potential mechanism for producing high frequency, almost periodic gravitational waves. The analyses carried so far have shown the existence of these modes and have considered damping by shear and bulk viscosity. Howeve... |
2105.02772 | Ekaterina Pozdeeva | Ekaterina O. Pozdeeva | Deviation from Slow-Roll Regime in the EGB Inflationary Models with
$r\sim N_e^{-1}$ | null | Universe (2021) 7, no. 6: 181 | 10.3390/universe7060181 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Einstein-Gauss-Bonnet (EGB) inflationary models using the
effective potential approach. We present evolution equations in the slow-roll
regime using the effective potential and the tensor-to-scalar ratio. The choice
of the effective potential is related to an expression of the spectral index in
terms of e... | [
{
"created": "Thu, 6 May 2021 15:59:14 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jun 2021 14:31:42 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Jun 2021 14:58:08 GMT",
"version": "v3"
}
] | 2021-06-30 | [
[
"Pozdeeva",
"Ekaterina O.",
""
]
] | We consider Einstein-Gauss-Bonnet (EGB) inflationary models using the effective potential approach. We present evolution equations in the slow-roll regime using the effective potential and the tensor-to-scalar ratio. The choice of the effective potential is related to an expression of the spectral index in terms of e-f... |
1905.05317 | George Alekseev A. | G.A. Alekseev and V.A. Belinski | Superposition of fields of two rotating charged masses in General
Relativity and existence of equilibrium configurations | 20 pages, no figures. arXiv admin note: substantial text overlap with
arXiv:1211.3964 | Gen Relativ Gravit (2019) 51: 68 | 10.1007/s10714-019-2543-0 | null | gr-qc hep-th nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that two Reissner-Nordstrom black holes or two overextreme
Reissner-Nordstrom sources cannot be in physical equilibrium. In the static
case such equilibrium is possible only if one of the sources is a black hole
and another one is a naked singularity. We define the notion of physical
equilibrium in genera... | [
{
"created": "Mon, 13 May 2019 23:32:15 GMT",
"version": "v1"
}
] | 2019-08-27 | [
[
"Alekseev",
"G. A.",
""
],
[
"Belinski",
"V. A.",
""
]
] | It is known that two Reissner-Nordstrom black holes or two overextreme Reissner-Nordstrom sources cannot be in physical equilibrium. In the static case such equilibrium is possible only if one of the sources is a black hole and another one is a naked singularity. We define the notion of physical equilibrium in general ... |
1201.4996 | Matteo Smerlak | Valentin Bonzom, Matteo Smerlak | Gauge symmetries in spinfoam gravity: the case for "cellular
quantization" | 6 pages | Phys. Rev. Lett. 108, 241303 (2012) | 10.1103/PhysRevLett.108.241303 | pi-qg-293 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spinfoam approach to quantum gravity rests on a "quantization" of BF
theory using 2-complexes and group representations. We explain why, in
dimension three and higher, this "spinfoam quantization" must be amended to be
made consistent with the gauge symmetries of discrete BF theory. We discuss a
suitable generali... | [
{
"created": "Tue, 24 Jan 2012 15:00:33 GMT",
"version": "v1"
}
] | 2012-08-27 | [
[
"Bonzom",
"Valentin",
""
],
[
"Smerlak",
"Matteo",
""
]
] | The spinfoam approach to quantum gravity rests on a "quantization" of BF theory using 2-complexes and group representations. We explain why, in dimension three and higher, this "spinfoam quantization" must be amended to be made consistent with the gauge symmetries of discrete BF theory. We discuss a suitable generaliza... |
1308.2383 | Shahram Jalalzadeh | M. Hashemi, S. Jalalzadeh and S. Vasheghani Farahani | Hawking temperature and the emergent cosmic space | 9 pages, many improvements, to appear in Gen. Relativ. Gravit | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this work is to model the evolution of the cosmic space based on
thermodynamical parameters. The universe is considered to have an apparent
horizon radius with a Kodama-Hayward temperature assigned to it. The method is
founded on the fact proposed by Padmanabhan [1,2] that the subtraction of the
surface an... | [
{
"created": "Sun, 11 Aug 2013 11:49:07 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Mar 2015 19:49:15 GMT",
"version": "v2"
}
] | 2015-03-31 | [
[
"Hashemi",
"M.",
""
],
[
"Jalalzadeh",
"S.",
""
],
[
"Farahani",
"S. Vasheghani",
""
]
] | The aim of this work is to model the evolution of the cosmic space based on thermodynamical parameters. The universe is considered to have an apparent horizon radius with a Kodama-Hayward temperature assigned to it. The method is founded on the fact proposed by Padmanabhan [1,2] that the subtraction of the surface and ... |
2304.05608 | Mohammad Vahid Takook | Mohammad Vahid Takook | Quantum de Sitter geometry | 12 pages, V2 some explanations added, | Universe 2024, 10(2), 70 | 10.3390/universe10020070 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Quantum de Sitter geometry is discussed using elementary field operator
algebras in Krein space quantization from an observer-independent point of
view, {\it i.e.} ambient space formalism. In quantum geometry, the conformal
sector of the metric becomes a dynamical degree of freedom, which can be
written in terms of a... | [
{
"created": "Wed, 12 Apr 2023 04:52:29 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jan 2024 19:59:19 GMT",
"version": "v2"
}
] | 2024-02-06 | [
[
"Takook",
"Mohammad Vahid",
""
]
] | Quantum de Sitter geometry is discussed using elementary field operator algebras in Krein space quantization from an observer-independent point of view, {\it i.e.} ambient space formalism. In quantum geometry, the conformal sector of the metric becomes a dynamical degree of freedom, which can be written in terms of a m... |
2108.10311 | Ernesto Contreras | M. Carrasco-Hidalgo, E. Contreras | Ultracompact stars with polynomial complexity by gravitational
decoupling | 7 pages, 4 figures. Version accepted in EPJC | Eur. Phys. J. C 81, 757 (2021) | 10.1140/epjc/s10052-021-09557-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we construct an ultracompact star configuration in the framework
of Gravitational Decoupling by the Minimal Geometric Deformation approach. We
use the complexity factor as a complementary condition to close the system of
differential equations. It is shown that for a polynomial complexity the
resulting s... | [
{
"created": "Mon, 23 Aug 2021 17:57:18 GMT",
"version": "v1"
}
] | 2021-09-15 | [
[
"Carrasco-Hidalgo",
"M.",
""
],
[
"Contreras",
"E.",
""
]
] | In this work we construct an ultracompact star configuration in the framework of Gravitational Decoupling by the Minimal Geometric Deformation approach. We use the complexity factor as a complementary condition to close the system of differential equations. It is shown that for a polynomial complexity the resulting sol... |
0902.4736 | Jose Edgar Madriz Aguilar | L. M. Reyes and Jose Edgar Madriz Aguilar | Embedding General Relativity with varying cosmological constant term in
five-dimensional Brans-Dicke theory of gravity in vacuum | 8 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility to recover a four-dimensional (4D) general
theory of relativity, as embedded in a 5D spacetime where gravity is governed
by a five-dimensional (5D) Brans-Dicke (BD) theory of gravity. Employing the
Gauss-Codazzi-Ricci equations and some ideas of the induced matter theory, we
obtain that... | [
{
"created": "Fri, 27 Feb 2009 01:21:33 GMT",
"version": "v1"
}
] | 2009-03-02 | [
[
"Reyes",
"L. M.",
""
],
[
"Aguilar",
"Jose Edgar Madriz",
""
]
] | We investigate the possibility to recover a four-dimensional (4D) general theory of relativity, as embedded in a 5D spacetime where gravity is governed by a five-dimensional (5D) Brans-Dicke (BD) theory of gravity. Employing the Gauss-Codazzi-Ricci equations and some ideas of the induced matter theory, we obtain that w... |
1503.04882 | Julio Cesar Fabris | T. Caram\^es, M.H. Daouda J.C. Fabris, A.M. Oliveira, O.F. Piattella,
V. Strokov | A Rastall Scalar-Tensor theory | Latex file, 6 pages, 4 figures in eps format. A short version of
arXiv:1409.2322 by the same authors. To appear in the proceedings of the II
Argentinian-Brazilian Meeting on Gravitation, Astrophysics and Cosmology,
april 22-25, 2014, Buenos Aires, Argentina | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We formulate a theory combining the principles of a scalar-tensor gravity and
the Rastall proposal of a violation of the usual conservation laws. In the
resulting Brans-Dicke-Rastall (BDR) theory the only exact, static, spherically
symmetric solution is a Robinson-Bertotti type solution besides the trivial
Schwarzsch... | [
{
"created": "Tue, 17 Mar 2015 00:20:25 GMT",
"version": "v1"
}
] | 2015-03-18 | [
[
"Caramês",
"T.",
""
],
[
"Fabris",
"M. H. Daouda J. C.",
""
],
[
"Oliveira",
"A. M.",
""
],
[
"Piattella",
"O. F.",
""
],
[
"Strokov",
"V.",
""
]
] | We formulate a theory combining the principles of a scalar-tensor gravity and the Rastall proposal of a violation of the usual conservation laws. In the resulting Brans-Dicke-Rastall (BDR) theory the only exact, static, spherically symmetric solution is a Robinson-Bertotti type solution besides the trivial Schwarzschil... |
gr-qc/9303032 | null | Joseph D. Romano | Geometrodynamics vs. Connection Dynamics | 88 pages (Latex file), UMDGR-93-129 | Gen.Rel.Grav. 25 (1993) 759-854 | 10.1007/BF00758384 | null | gr-qc | null | The purpose of this review is to describe in some detail the mathematical
relationship between geometrodynamics and connection dynamics in the context of
the classical theories of 2+1 and 3+1 gravity. I analyze the standard
Einstein-Hilbert theory (in any spacetime dimension), the Palatini and
Chern-Simons theories i... | [
{
"created": "Fri, 26 Mar 1993 22:25:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Romano",
"Joseph D.",
""
]
] | The purpose of this review is to describe in some detail the mathematical relationship between geometrodynamics and connection dynamics in the context of the classical theories of 2+1 and 3+1 gravity. I analyze the standard Einstein-Hilbert theory (in any spacetime dimension), the Palatini and Chern-Simons theories in ... |
gr-qc/0002081 | Niclas Thisell | Niclas Thisell | Is gravity inherent to relativistic many-particle systems? | 8 pages, no figures | null | null | null | gr-qc | null | This paper discusses the somewhat unintuitive conjecture that many
Lorentz-invariant many-particle models can be reinterpreted to satisfy the gtr
field equations. It is shown that a careful remapping of coordinates yields a
non-trivial Riemannian manifold. Furthermore an energy-momentum tensor is
outlined and it is a... | [
{
"created": "Wed, 23 Feb 2000 12:06:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Thisell",
"Niclas",
""
]
] | This paper discusses the somewhat unintuitive conjecture that many Lorentz-invariant many-particle models can be reinterpreted to satisfy the gtr field equations. It is shown that a careful remapping of coordinates yields a non-trivial Riemannian manifold. Furthermore an energy-momentum tensor is outlined and it is arg... |
gr-qc/9510056 | Martin Koehler | R. Brunetti and K. Fredenhagen and M. Koehler | The microlocal spectrum condition and Wick polynomials of free fields on
curved spacetimes | 21 pages, AMS-LaTeX, 2 figures appended as Postscript files | Commun.Math.Phys. 180 (1996) 633-652 | 10.1007/BF02099626 | DESY 95-196 | gr-qc | null | Quantum fields propagating on a curved spacetime are investigated in terms of
microlocal analysis. We discuss a condition on the wave front set for the
corresponding n-point distributions, called ``microlocal spectrum condition''
($\mu$SC). On Minkowski space, this condition is satisfied as a consequence of
the usual... | [
{
"created": "Fri, 27 Oct 1995 09:51:07 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Brunetti",
"R.",
""
],
[
"Fredenhagen",
"K.",
""
],
[
"Koehler",
"M.",
""
]
] | Quantum fields propagating on a curved spacetime are investigated in terms of microlocal analysis. We discuss a condition on the wave front set for the corresponding n-point distributions, called ``microlocal spectrum condition'' ($\mu$SC). On Minkowski space, this condition is satisfied as a consequence of the usual s... |
1004.2834 | Hanno Sahlmann | Hanno Sahlmann and Thomas Thiemann | Abelian Chern-Simons theory, Stokes' theorem, and generalized
connections | 20 pages, 4 figures; v3: material about natural framings collected in
one section, typos removed. This version identical to published article | Journal of Geometry and Physics 62 (2) (2012) 204-212 | 10.1016/j.geomphys.2011.10.012 | KA-TP-09-2010 | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Generalized connections and their calculus have been developed in the context
of quantum gravity. Here we apply them to abelian Chern-Simons theory. We
derive the expectation values of holonomies in U(1) Chern-Simons theory using
Stokes' theorem, flux operators and generalized connections. A framing of the
holonomy l... | [
{
"created": "Fri, 16 Apr 2010 12:59:41 GMT",
"version": "v1"
},
{
"created": "Fri, 28 May 2010 10:09:39 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Nov 2011 02:27:54 GMT",
"version": "v3"
}
] | 2011-11-15 | [
[
"Sahlmann",
"Hanno",
""
],
[
"Thiemann",
"Thomas",
""
]
] | Generalized connections and their calculus have been developed in the context of quantum gravity. Here we apply them to abelian Chern-Simons theory. We derive the expectation values of holonomies in U(1) Chern-Simons theory using Stokes' theorem, flux operators and generalized connections. A framing of the holonomy loo... |
2403.18785 | Huanchen Hu | Huanchen Hu and Paulo C. C. Freire | Measuring the Lense-Thirring precession and the neutron star moment of
inertia with pulsars | Invited review for special issue of Universe on "Studies in Neutron
Stars" (accepted); 24 pages, 9 figures and 1 table | null | null | null | gr-qc astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutron stars (NSs) are compact objects that host the densest forms of matter
in the observable universe, providing unique opportunities to study the
behaviour of matter at extreme densities. While precision measurements of NS
masses through pulsar timing have imposed effective constraints on the equation
of state (E... | [
{
"created": "Wed, 27 Mar 2024 17:32:22 GMT",
"version": "v1"
}
] | 2024-03-28 | [
[
"Hu",
"Huanchen",
""
],
[
"Freire",
"Paulo C. C.",
""
]
] | Neutron stars (NSs) are compact objects that host the densest forms of matter in the observable universe, providing unique opportunities to study the behaviour of matter at extreme densities. While precision measurements of NS masses through pulsar timing have imposed effective constraints on the equation of state (EoS... |
0912.1143 | Miguel Gustavo de Campos Batista | M. de Campos | Observational consequences of a dark interaction model | 12 pages, 6 figures. To appear in the Brazilian Journal of Physics | Braz.J.Phys.40:398,2010 | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a model with decay of dark energy and creation of the dark matter
particles. We integrate the field equations and find the transition redshift
where the evolution process of the universe change the accelerated expansion,
and discuss the luminosity distance, acoustic oscillations and the statefinder
parameter... | [
{
"created": "Sun, 6 Dec 2009 22:26:37 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Sep 2010 14:38:02 GMT",
"version": "v2"
}
] | 2011-03-04 | [
[
"de Campos",
"M.",
""
]
] | We study a model with decay of dark energy and creation of the dark matter particles. We integrate the field equations and find the transition redshift where the evolution process of the universe change the accelerated expansion, and discuss the luminosity distance, acoustic oscillations and the statefinder parameters. |
1003.4034 | Edward Anderson | Edward Anderson | Quantum Cosmological Relational Model of Shape and Scale in 1-d | References and some more motivation added | Class.Quant.Grav.28:065011,2011 | 10.1088/0264-9381/28/6/065011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relational particle models are useful toy models for quantum cosmology and
the problem of time in quantum general relativity. This paper shows how to
extend existing work on concrete examples of relational particle models in 1-d
to include a notion of scale. This is useful as regards forming a tight analogy
with quan... | [
{
"created": "Sun, 21 Mar 2010 23:26:41 GMT",
"version": "v1"
},
{
"created": "Sun, 30 May 2010 22:56:42 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Jun 2010 18:23:00 GMT",
"version": "v3"
},
{
"created": "Mon, 2 Aug 2010 23:52:11 GMT",
"version": "v4"
},
{
"cre... | 2011-03-18 | [
[
"Anderson",
"Edward",
""
]
] | Relational particle models are useful toy models for quantum cosmology and the problem of time in quantum general relativity. This paper shows how to extend existing work on concrete examples of relational particle models in 1-d to include a notion of scale. This is useful as regards forming a tight analogy with quantu... |
2403.13907 | Siddhant Siddhant | Siddhant Siddhant, Alexander M. Grant and David A. Nichols | Higher memory effects and the post-Newtonian calculation of their
gravitational-wave signals | 42 + 8 pages, no figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new hierarchy of lasting gravitational-wave effects (the higher memory
effects) was recently identified in asymptotically flat spacetimes, with the
better-known displacement, spin, and center-of-mass memory effects included as
the lowest two orders in the set of these effects. These gravitational-wave
observables a... | [
{
"created": "Wed, 20 Mar 2024 18:29:06 GMT",
"version": "v1"
}
] | 2024-03-22 | [
[
"Siddhant",
"Siddhant",
""
],
[
"Grant",
"Alexander M.",
""
],
[
"Nichols",
"David A.",
""
]
] | A new hierarchy of lasting gravitational-wave effects (the higher memory effects) was recently identified in asymptotically flat spacetimes, with the better-known displacement, spin, and center-of-mass memory effects included as the lowest two orders in the set of these effects. These gravitational-wave observables are... |
2303.13130 | Vinod Dagwal | Y.S.Solanke, Sandhya Mhaske, D.D. Pawar, V. J. Dagwal | Two fluid cosmological models in $f(R, T)$ theory of gravity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Present work deals with the two fluid Bianchi Type-V cosmological models
consisting of matter and radiating source in the $f(R, T)$ theory of gravity
studied by Harko et al. (2011). In this paper, we developed a new idea about
$f(R, T)$ gravity with the help of two fluids: one fluid is matter field
modeling material ... | [
{
"created": "Thu, 23 Mar 2023 09:32:02 GMT",
"version": "v1"
}
] | 2023-03-24 | [
[
"Solanke",
"Y. S.",
""
],
[
"Mhaske",
"Sandhya",
""
],
[
"Pawar",
"D. D.",
""
],
[
"Dagwal",
"V. J.",
""
]
] | Present work deals with the two fluid Bianchi Type-V cosmological models consisting of matter and radiating source in the $f(R, T)$ theory of gravity studied by Harko et al. (2011). In this paper, we developed a new idea about $f(R, T)$ gravity with the help of two fluids: one fluid is matter field modeling material co... |
2105.14067 | Anzhong Wang | Bao-Fei Li, Parampreet Singh, and Anzhong Wang | Phenomenological implications of modified loop cosmologies: an overview | revtex4, 11 figures, and no tables. Contribution to the Special Issue
"Loop Quantum Cosmology" in Frontiers in Astronomy and Space Sciences, edited
by B. Elizaga-Navascu\'es, G. Mena-Marug\'an, and F. Vidotto | Front. Astron. Space Sci. 8 (2021) 701417 | 10.3389/fspas.2021.701417 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we first provide a brief review of the effective dynamics of
two recently well-studied models of modified loop quantum cosmologies (mLQCs),
which arise from different regularizations of the Hamiltonian constraint and
show the robustness of a generic resolution of the big bang singularity,
replaced by a... | [
{
"created": "Fri, 28 May 2021 19:11:32 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jun 2021 15:41:09 GMT",
"version": "v2"
}
] | 2021-06-25 | [
[
"Li",
"Bao-Fei",
""
],
[
"Singh",
"Parampreet",
""
],
[
"Wang",
"Anzhong",
""
]
] | In this paper, we first provide a brief review of the effective dynamics of two recently well-studied models of modified loop quantum cosmologies (mLQCs), which arise from different regularizations of the Hamiltonian constraint and show the robustness of a generic resolution of the big bang singularity, replaced by a q... |
gr-qc/0606036 | Dr Mayeul Arminjon | Mayeul Arminjon | Post-Newtonian equation for the energy levels of a Dirac particle in a
static metric | 12pt LaTeX, 17 pages. v2: version accepted for publication in
Phys.Rev.D: comments on scalar product changed, using a recent paper;
discussion of PN expansions simplified (no change of units any more);
numerical estimates for ultra-cold neutrons in the Earth's gravity | Phys.Rev. D74 (2006) 065017 | 10.1103/PhysRevD.74.065017 | null | gr-qc | null | We study first the Hamiltonian operator H corresponding to the Fock-Weyl
extension of the Dirac equation to gravitation. When searching for stationary
solutions to this equation, in a static metric, we show that just one invariant
Hermitian product appears natural. In the case of a space-isotropic metric, H
is Hermit... | [
{
"created": "Thu, 8 Jun 2006 16:50:53 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Sep 2006 07:19:45 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Arminjon",
"Mayeul",
""
]
] | We study first the Hamiltonian operator H corresponding to the Fock-Weyl extension of the Dirac equation to gravitation. When searching for stationary solutions to this equation, in a static metric, we show that just one invariant Hermitian product appears natural. In the case of a space-isotropic metric, H is Hermitia... |
2311.14047 | Francisco Tello Ortiz | Joel F. Saavedra and Francisco Tello-Ortiz | Einstein-Gauss-Bonnet gravity: Phase transitions and micro-structure in
an FLRW background | null | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | For an FLRW model, thermodynamic phase transitions are investigated in the
Einstein-Gauss-Bonnet gravity framework. Using the work density, the equation
of state is derived, and the criticality conditions are employed to determine
the critical points where possible phase transitions occur. The appearance of
phase tra... | [
{
"created": "Thu, 23 Nov 2023 15:02:26 GMT",
"version": "v1"
}
] | 2023-11-27 | [
[
"Saavedra",
"Joel F.",
""
],
[
"Tello-Ortiz",
"Francisco",
""
]
] | For an FLRW model, thermodynamic phase transitions are investigated in the Einstein-Gauss-Bonnet gravity framework. Using the work density, the equation of state is derived, and the criticality conditions are employed to determine the critical points where possible phase transitions occur. The appearance of phase trans... |
2202.06760 | Lorenzo Gavassino | Lorenzo Gavassino | Stability and causality of Carter's multifluid theory | 18 pages, no figures, published on CQG see
https://doi.org/10.1088/1361-6382/ac79f4 | Class. Quantum Grav. 39 185008 (2022) | 10.1088/1361-6382/ac79f4 | null | gr-qc astro-ph.HE physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Stability and causality are studied for linear perturbations about
equilibrium in Carter's multifluid theory. Our stability analysis is grounded
on the requirement that the entropy of the multifluid, plus that of the
environment, must be maximised at equilibrium. This allows us to compute a
quadratic Lyapunov functio... | [
{
"created": "Mon, 14 Feb 2022 14:31:57 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Aug 2022 13:35:28 GMT",
"version": "v2"
}
] | 2022-08-23 | [
[
"Gavassino",
"Lorenzo",
""
]
] | Stability and causality are studied for linear perturbations about equilibrium in Carter's multifluid theory. Our stability analysis is grounded on the requirement that the entropy of the multifluid, plus that of the environment, must be maximised at equilibrium. This allows us to compute a quadratic Lyapunov functiona... |
1005.1866 | Marko Vojinovic | Aleksandar Mikovic and Marko Vojinovic | Large-spin asymptotics of Euclidean LQG flat-space wavefunctions | null | Adv. Theor. Math. Phys. 15, 801 (2011) | 10.4310/ATMP.2011.v15.n3.a5 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the large-spin asymptotics of a class of spin-network
wavefunctions of Euclidean Loop Quantum Gravity, which corresponds to a flat
spacetime. A wavefunction from this class can be represented as a sum over the
spins of an amplitude for a spin network whose graph is a composition of the
the wavefunction spi... | [
{
"created": "Tue, 11 May 2010 15:40:43 GMT",
"version": "v1"
}
] | 2014-01-03 | [
[
"Mikovic",
"Aleksandar",
""
],
[
"Vojinovic",
"Marko",
""
]
] | We analyze the large-spin asymptotics of a class of spin-network wavefunctions of Euclidean Loop Quantum Gravity, which corresponds to a flat spacetime. A wavefunction from this class can be represented as a sum over the spins of an amplitude for a spin network whose graph is a composition of the the wavefunction spin ... |
2205.01182 | Chris Van Den Broeck | Pawan Kumar Gupta, Anna Puecher, Peter T.H. Pang, Justin Janquart,
Gideon Koekoek, Chris Van Den Broeck | Determining the equation of state of neutron stars with Einstein
Telescope using tidal effects and r-mode excitations from a population of
binary inspirals | 9 pages, 4 figures | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Third-generation gravitational wave (GW) observatories such as Einstein
Telescope (ET) and Cosmic Explorer (CE) will be ideal instruments to probe the
structure of neutron stars through the GWs they emit when undergoing binary
coalescence. In this work we make predictions about how well ET in particular
will enable u... | [
{
"created": "Mon, 2 May 2022 20:00:56 GMT",
"version": "v1"
}
] | 2022-05-04 | [
[
"Gupta",
"Pawan Kumar",
""
],
[
"Puecher",
"Anna",
""
],
[
"Pang",
"Peter T. H.",
""
],
[
"Janquart",
"Justin",
""
],
[
"Koekoek",
"Gideon",
""
],
[
"Broeck",
"Chris Van Den",
""
]
] | Third-generation gravitational wave (GW) observatories such as Einstein Telescope (ET) and Cosmic Explorer (CE) will be ideal instruments to probe the structure of neutron stars through the GWs they emit when undergoing binary coalescence. In this work we make predictions about how well ET in particular will enable us ... |
2203.05964 | Mouhssine Koussour | M. Koussour and M. Bennai | Stability analysis of anisotropic Bianchi type-I cosmological model in
teleparallel gravity | 14 pages, 5 figures, this version is under revision in Classical and
Quantum Gravity | null | 10.1088/1361-6382/ac61ad | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study a cosmological model of Bianchi type-I Universe in
teleparallel gravity for a perfect fluid. To obtain the cosmological solution
of the model, we assume that the deceleration parameter is a linear function of
the Hubble parameter $H$ i.e. $q=-1+\beta H$ (where $\beta $ as a positive
constant). ... | [
{
"created": "Wed, 9 Mar 2022 23:14:08 GMT",
"version": "v1"
}
] | 2022-05-25 | [
[
"Koussour",
"M.",
""
],
[
"Bennai",
"M.",
""
]
] | In this work, we study a cosmological model of Bianchi type-I Universe in teleparallel gravity for a perfect fluid. To obtain the cosmological solution of the model, we assume that the deceleration parameter is a linear function of the Hubble parameter $H$ i.e. $q=-1+\beta H$ (where $\beta $ as a positive constant). Co... |
1607.01499 | Salvatore Capozziello | Alireza Sepehri, Richard Pincak, Kazuharu Bamba, Salvatore
Capozziello, Emmanuel N. Saridakis | Current density and conductivity through modified gravity in the
graphene with defects | 26 pages, 8 figures, to be published in International Journal of
Modern Physics D | null | 10.1142/S0218271817500948 | null | gr-qc cond-mat.mes-hall hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a model describing the evolution of the free electron current
density in graphene.
Based on the concept of Mp-branes, we perform the analysis using the
difference between curvatures of parallel and antiparallel spins. In such a
framework an effective graviton emerges in the form of gauge field exchange
b... | [
{
"created": "Wed, 6 Jul 2016 07:42:39 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Feb 2017 09:00:19 GMT",
"version": "v2"
}
] | 2017-07-26 | [
[
"Sepehri",
"Alireza",
""
],
[
"Pincak",
"Richard",
""
],
[
"Bamba",
"Kazuharu",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We propose a model describing the evolution of the free electron current density in graphene. Based on the concept of Mp-branes, we perform the analysis using the difference between curvatures of parallel and antiparallel spins. In such a framework an effective graviton emerges in the form of gauge field exchange betwe... |
1203.6542 | Charles Dyer | Mitchell Thomson and Charles C. Dyer | Black Hole Statistical Mechanics and The Angular Velocity Ensemble | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An new ensemble - the angular velocity ensemble - is derived using Jaynes'
method of maximising entropy subject to prior information constraints. The
relevance of the ensemble to black holes is motivated by a discussion of
external parameters in statistical mechanics and their absence from the
Hamiltonian of general ... | [
{
"created": "Thu, 29 Mar 2012 14:53:26 GMT",
"version": "v1"
}
] | 2012-03-30 | [
[
"Thomson",
"Mitchell",
""
],
[
"Dyer",
"Charles C.",
""
]
] | An new ensemble - the angular velocity ensemble - is derived using Jaynes' method of maximising entropy subject to prior information constraints. The relevance of the ensemble to black holes is motivated by a discussion of external parameters in statistical mechanics and their absence from the Hamiltonian of general re... |
2104.11066 | Ali \"Ovg\"un Dr. | Gabriel W. Joseph and Ali \"Ovg\"un | Cosmology with variable $G$ and nonlinear electrodynamics | 6 pages, Accepted for publication in Indian Journal of Physics | Indian J Phys 96, 1861-1866 (2022) | 10.1007/s12648-021-02110-4 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In a bid to resolve lingering problems in cosmology, more focus is being
tilted towards cosmological models in which physical constants of nature are
not necessarily real constants but vary with cosmic time. In this paper, we
study a cosmological model in nonlinear electrodynamics with Newton's
gravitational constant... | [
{
"created": "Wed, 21 Apr 2021 12:42:31 GMT",
"version": "v1"
}
] | 2022-05-05 | [
[
"Joseph",
"Gabriel W.",
""
],
[
"Övgün",
"Ali",
""
]
] | In a bid to resolve lingering problems in cosmology, more focus is being tilted towards cosmological models in which physical constants of nature are not necessarily real constants but vary with cosmic time. In this paper, we study a cosmological model in nonlinear electrodynamics with Newton's gravitational constant $... |
gr-qc/9710023 | Masaru Shibata | Masaru Shibata(Osaka University), Ken-ichi Oohara(Niigata University),
and Takashi Nakamura(YITP) | Numerical study on the hydrodynamic instability of binary stars in the
first post Newtonian approximation of general relativity | 16 pages(11 figures). To appear in Prog. Theor. Phys. vol.98(1997) | Prog.Theor.Phys. 98 (1997) 1081-1098 | 10.1143/PTP.98.1081 | OU-TAP 64, YITP-97-41 | gr-qc | null | We present numerical results on the hydrodynamic stability of coalescing
binary stars in the first post Newtonian(1PN) approximation of general
relativity. We pay particular attention to the hydrodynamical instability of
corotating binary stars in equilibrium states assuming the stiff polytropic
equation of state wit... | [
{
"created": "Fri, 3 Oct 1997 12:49:54 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Shibata",
"Masaru",
"",
"Osaka University"
],
[
"Oohara",
"Ken-ichi",
"",
"Niigata University"
],
[
"Nakamura",
"Takashi",
"",
"YITP"
]
] | We present numerical results on the hydrodynamic stability of coalescing binary stars in the first post Newtonian(1PN) approximation of general relativity. We pay particular attention to the hydrodynamical instability of corotating binary stars in equilibrium states assuming the stiff polytropic equation of state with ... |
gr-qc/0006008 | Wataru Souma | Wataru Souma | Gauge and Cutoff Function Dependence of the Ultraviolet Fixed Point in
Quantum Gravity | 18 pages, 3 figures | null | null | KUCP0146 | gr-qc | null | The exact renormalization group equation for pure quantum gravity is derived
for an arbitrary gauge parameter in the space-time dimension $d=4$. This
equation is given by a non-linear functional differential equation for the
effective average action. An action functional of the effective average action
is approximate... | [
{
"created": "Sat, 3 Jun 2000 07:54:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Souma",
"Wataru",
""
]
] | The exact renormalization group equation for pure quantum gravity is derived for an arbitrary gauge parameter in the space-time dimension $d=4$. This equation is given by a non-linear functional differential equation for the effective average action. An action functional of the effective average action is approximated ... |
gr-qc/0502088 | Stanley L. Robertson | Stanley L. Robertson | Newtonian Gravity Predictions For Gravity Probe B | 9 pages. Mathematical error corrected | null | null | null | gr-qc astro-ph | null | Newtonian gravity and special relativity combine to produce a gravitomagnetic
precession of an orbiting gyroscope that is one fourth as large as predicted by
General Relativity. The geodetic effect is the same in both cases.
| [
{
"created": "Tue, 22 Feb 2005 00:32:51 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Feb 2005 18:57:26 GMT",
"version": "v2"
},
{
"created": "Thu, 24 Feb 2005 01:33:26 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Robertson",
"Stanley L.",
""
]
] | Newtonian gravity and special relativity combine to produce a gravitomagnetic precession of an orbiting gyroscope that is one fourth as large as predicted by General Relativity. The geodetic effect is the same in both cases. |
0812.4395 | Sascha Husa | Sascha Husa | Numerical modeling of black holes as sources of gravitational waves in a
nutshell | 28 pages, lectures given at winter school 'Conceptual and Numerical
Challenges in Femto- and Peta-Scale Physics' in Schladming, Austria, 2007 | Eur. Phys. J. ST 152:183-207, 2007 | 10.1140/epjst/e2007-00381-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These notes summarize basic concepts underlying numerical relativity and in
particular the numerical modeling of black hole dynamics as a source of
gravitational waves. Main topics are the 3+1 decomposition of general
relativity, the concept of a well-posed initial value problem, the construction
of initial data for ... | [
{
"created": "Tue, 23 Dec 2008 13:58:29 GMT",
"version": "v1"
}
] | 2009-02-26 | [
[
"Husa",
"Sascha",
""
]
] | These notes summarize basic concepts underlying numerical relativity and in particular the numerical modeling of black hole dynamics as a source of gravitational waves. Main topics are the 3+1 decomposition of general relativity, the concept of a well-posed initial value problem, the construction of initial data for ge... |
1102.3834 | Maria E. Gabach Clement | Mar/'ia E. Gabach Clement | Comment on "Horizon area- Angular momentum inequality for a class of
axially symmetric black holes" [arXiv:1012.2413] | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the results presented by Ace\~na \textit{et al} in the afore
mentioned paper, [arXiv:1012.2413], to the case of axisymmetric, maximal
initial data which are invariant under an inversion transformation.
| [
{
"created": "Fri, 18 Feb 2011 13:32:56 GMT",
"version": "v1"
}
] | 2011-02-21 | [
[
"Clement",
"Mar/'ia E. Gabach",
""
]
] | We extend the results presented by Ace\~na \textit{et al} in the afore mentioned paper, [arXiv:1012.2413], to the case of axisymmetric, maximal initial data which are invariant under an inversion transformation. |
2406.04878 | Donato Bini | Donato Bini, Thibault Damour | Fourth Post-Minkowskian Local-in-Time Conservative Dynamics of Binary
Systems | 19 pages, revtex macros used | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the purely local-in-time (scale-free and logarithm-free) part of
the conservative dynamics of gravitationally interacting two-body systems at
the fourth post-Minkowskian order, and at the thirtiest order in velocity. The
gauge-invariant content of this fourth post-Minkowskian local dynamics is given
in two... | [
{
"created": "Fri, 7 Jun 2024 12:21:25 GMT",
"version": "v1"
}
] | 2024-06-10 | [
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
]
] | We compute the purely local-in-time (scale-free and logarithm-free) part of the conservative dynamics of gravitationally interacting two-body systems at the fourth post-Minkowskian order, and at the thirtiest order in velocity. The gauge-invariant content of this fourth post-Minkowskian local dynamics is given in two w... |
1503.08952 | Xin-Zhou Li | Ping Li, Xin-zhou Li and Ping Xi | Analytical expression for a class of spherically symmetric solutions in
Lorentz breaking massive gravity | A typo is corrected. Some sentences are polished. 26pages, 1 figure.
arXiv:1503.08952 [gr-qc] | Class. Quantum Grav. 33 (2016) 115004 | 10.1088/0264-9381/33/11/115004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a detailed study of the spherically symmetric solutions in Lorentz
breaking massive gravity. There is an undetermined function $\mathcal{F}(X,
w_1, w_2, w_3)$ in the action of St\"{u}ckelberg fields
$S_{\phi}=\Lambda^4\int{d^4x\sqrt{-g}\mathcal{F}}$, which should be resolved
through physical means. In the ... | [
{
"created": "Tue, 31 Mar 2015 08:44:19 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jun 2015 02:32:14 GMT",
"version": "v2"
},
{
"created": "Thu, 11 Jun 2015 03:04:41 GMT",
"version": "v3"
},
{
"created": "Tue, 11 Aug 2015 08:52:44 GMT",
"version": "v4"
},
{
"cr... | 2016-04-29 | [
[
"Li",
"Ping",
""
],
[
"Li",
"Xin-zhou",
""
],
[
"Xi",
"Ping",
""
]
] | We present a detailed study of the spherically symmetric solutions in Lorentz breaking massive gravity. There is an undetermined function $\mathcal{F}(X, w_1, w_2, w_3)$ in the action of St\"{u}ckelberg fields $S_{\phi}=\Lambda^4\int{d^4x\sqrt{-g}\mathcal{F}}$, which should be resolved through physical means. In the ge... |
gr-qc/9602024 | null | Luc Blanchet, Bala R. Iyer, Clifford M. Will and Alan G. Wiseman | Gravitational waveforms from inspiralling compact binaries to
second-post-Newtonian order | 17 pages; To appear in Classical and Quantum Gravity | Class.Quant.Grav. 13 (1996) 575-584 | 10.1088/0264-9381/13/4/002 | null | gr-qc | null | The two independent ``plus" and ``cross" polarization waveforms associated
with the gravitational waves emitted by inspiralling, non-spinning, compact
binaries are presented, ready for use in the data analysis of signals received
by future laser interferometer gravitational-wave detectors such as LIGO and
VIRGO. The ... | [
{
"created": "Tue, 13 Feb 1996 10:22:44 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Blanchet",
"Luc",
""
],
[
"Iyer",
"Bala R.",
""
],
[
"Will",
"Clifford M.",
""
],
[
"Wiseman",
"Alan G.",
""
]
] | The two independent ``plus" and ``cross" polarization waveforms associated with the gravitational waves emitted by inspiralling, non-spinning, compact binaries are presented, ready for use in the data analysis of signals received by future laser interferometer gravitational-wave detectors such as LIGO and VIRGO. The co... |
gr-qc/9503042 | Parthasarathi Mitra | P. Mitra | Black hole entropy: departures from area law | Invited talk at Puri, December 1994; 16 pages, LATEX | null | null | P/95-06 | gr-qc hep-th | null | The thermodynamic and euclidean functional integral approaches to black hole
entropy are discussed. The existence of some freedom in the definition of the
entropy is pointed out and the possibility of a departure from the
semiclassical expression discussed in the light of quantum corrections. The
semiclassical area d... | [
{
"created": "Thu, 23 Mar 1995 03:51:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mitra",
"P.",
""
]
] | The thermodynamic and euclidean functional integral approaches to black hole entropy are discussed. The existence of some freedom in the definition of the entropy is pointed out and the possibility of a departure from the semiclassical expression discussed in the light of quantum corrections. The semiclassical area dep... |
0906.4480 | Leonardo Fernandez-Jambrina | F.J. Chinea, L. Fern\'andez-Jambrina, J.M.M. Senovilla | Absence of singularities in a cosmological perfect fluid solution | 5 pp. Published in Proceedings of ERE'91 | Recent Developments in Gravitation, Eds: A. Feinstein y J. Ibanez.
World Scientific, Singapore, 172-176 (1992) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this lecture we will show some properties of a singularity-free solution
to Einstein's equations and its accordance with some theorems dealing with
singularities. We will also discuss the implications of the results.
| [
{
"created": "Wed, 24 Jun 2009 14:06:35 GMT",
"version": "v1"
}
] | 2009-06-25 | [
[
"Chinea",
"F. J.",
""
],
[
"Fernández-Jambrina",
"L.",
""
],
[
"Senovilla",
"J. M. M.",
""
]
] | In this lecture we will show some properties of a singularity-free solution to Einstein's equations and its accordance with some theorems dealing with singularities. We will also discuss the implications of the results. |
gr-qc/0306039 | Dr. Anirudh Pradhan | Anirudh Pradhan, Sudhir Kumar Srivastav and Kanti R. Jotania | Some Inhomogeneous Magnetized Viscous Fluid Cosmological Models with
Varying $\Lambda$ | 17 pages, 1 figure | Czech.J.Phys. 54 (2004) 255-272 | 10.1023/B:CJOP.0000014406.99587.cf | null | gr-qc | null | Some cylindrically symmetric inhomogeneous viscous fluid cosmological models
with electro-magnetic field are obtained. To get a solution a supplementary
condition between metric potentials is used. The viscosity coefficient of bulk
viscous fluid is assumed to be a power function of mass density. Without
assumin g any... | [
{
"created": "Tue, 10 Jun 2003 11:04:29 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Srivastav",
"Sudhir Kumar",
""
],
[
"Jotania",
"Kanti R.",
""
]
] | Some cylindrically symmetric inhomogeneous viscous fluid cosmological models with electro-magnetic field are obtained. To get a solution a supplementary condition between metric potentials is used. The viscosity coefficient of bulk viscous fluid is assumed to be a power function of mass density. Without assumin g any {... |
2308.02146 | Ren Tsuda | Ren Tsuda, Ryotaku Suzuki, and Shinya Tomizawa | Existence conditions of nonsingular dyonic black holes in nonlinear
electrodynamics | 10 pages, largely revised from the first version | null | null | TTI-MATHPHYS-22 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity coupled to nonlinear electrodynamics is known to have
nonsingular black hole solutions. We investigate the existence conditions for
such solutions in two-parameter Lagrangian ${\cal L} \left( {\cal F} , {\cal G}
\right)$. In particular, we obtain a criterion on the Lagrangian for the
existence of n... | [
{
"created": "Fri, 4 Aug 2023 06:02:05 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Oct 2023 08:26:23 GMT",
"version": "v2"
}
] | 2023-10-16 | [
[
"Tsuda",
"Ren",
""
],
[
"Suzuki",
"Ryotaku",
""
],
[
"Tomizawa",
"Shinya",
""
]
] | General relativity coupled to nonlinear electrodynamics is known to have nonsingular black hole solutions. We investigate the existence conditions for such solutions in two-parameter Lagrangian ${\cal L} \left( {\cal F} , {\cal G} \right)$. In particular, we obtain a criterion on the Lagrangian for the existence of non... |
gr-qc/9910071 | Yoshiaki Ohkuwa | Yoshiaki Ohkuwa | Coherent state approach to quantum clock in a model where the
Hamiltonian is a difference between two harmonic oscillators | 19 pages, Latex, 1 figure | null | null | MMC-M-12 | gr-qc | null | In order to study the "problem of time", Rovelli proposed a model of a two
harmonic oscillator system where one of the oscillators can be thought of as a
'clock' for the other oscillator. In this paper we examine a model where the
Hamiltonian is a difference between two harmonic oscillators, and we consider
one of th... | [
{
"created": "Thu, 21 Oct 1999 09:47:58 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Oct 1999 11:09:03 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ohkuwa",
"Yoshiaki",
""
]
] | In order to study the "problem of time", Rovelli proposed a model of a two harmonic oscillator system where one of the oscillators can be thought of as a 'clock' for the other oscillator. In this paper we examine a model where the Hamiltonian is a difference between two harmonic oscillators, and we consider one of them... |
0810.3752 | Todd Oliynyk | Todd A. Oliynyk | Post-Newtonian expansions for perfect fluids | null | Commun.Math.Phys.288:847-886,2009 | 10.1007/s00220-009-0738-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the existence of a large class of dynamical solutions to the
Einstein-Euler equations that have a first post-Newtonian expansion. The
results here are based on the elliptic-hyperbolic formulation of the
Einstein-Euler equations used in \cite{Oli06}, which contains a singular
parameter $\ep = v_T/c$, where $v... | [
{
"created": "Tue, 21 Oct 2008 06:17:53 GMT",
"version": "v1"
}
] | 2009-05-12 | [
[
"Oliynyk",
"Todd A.",
""
]
] | We prove the existence of a large class of dynamical solutions to the Einstein-Euler equations that have a first post-Newtonian expansion. The results here are based on the elliptic-hyperbolic formulation of the Einstein-Euler equations used in \cite{Oli06}, which contains a singular parameter $\ep = v_T/c$, where $v_T... |
1506.08067 | Daniel Cartin | Daniel Cartin | Braids as a representation space of SU(5) | 9 pages, 7 figures | J. Math. Phys. 56, 061703 (2015) | 10.1063/1.4922829 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard Model of particle physics provides very accurate predictions of
phenomena occurring at the sub-atomic level, but the reason for the choice of
symmetry group and the large number of particles considered elementary, is
still unknown. Along the lines of previous preon models positing a substructure
to expla... | [
{
"created": "Tue, 23 Jun 2015 01:25:39 GMT",
"version": "v1"
}
] | 2015-06-29 | [
[
"Cartin",
"Daniel",
""
]
] | The Standard Model of particle physics provides very accurate predictions of phenomena occurring at the sub-atomic level, but the reason for the choice of symmetry group and the large number of particles considered elementary, is still unknown. Along the lines of previous preon models positing a substructure to explain... |
1909.06733 | Pei-Ken Hung | Pei-Ken Hung | The linear stability of the Schwarzschild spacetime in the harmonic
gauge: even part | null | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the even part of the linear stability of the
Schwarzschild spacetime as a continuation of [22]. By taking the harmonic
gauge, we prove that the energy decays at a rate $\tau^{-2+}$ for the solution
of the linearized Einstein equation after subtracting its spherically symmetric
part. We further ... | [
{
"created": "Sun, 15 Sep 2019 04:52:50 GMT",
"version": "v1"
}
] | 2019-09-17 | [
[
"Hung",
"Pei-Ken",
""
]
] | In this paper we study the even part of the linear stability of the Schwarzschild spacetime as a continuation of [22]. By taking the harmonic gauge, we prove that the energy decays at a rate $\tau^{-2+}$ for the solution of the linearized Einstein equation after subtracting its spherically symmetric part. We further sh... |
1006.3655 | Thomas Sotiriou | Goffredo Chirco, Stefano Liberati and Thomas P. Sotiriou | Gedanken experiments on nearly extremal black holes and the Third Law | v2: minor edits, references added; v3: minor edits to match published
version | Phys.Rev.D82:104015,2010 | 10.1103/PhysRevD.82.104015 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A gedanken experiment in which a black hole is pushed to spin at its maximal
rate by tossing into it a test body is considered. After demonstrating that
this is kinematically possible for a test body made of reasonable matter, we
focus on its implications for black hole thermodynamics and the apparent
violation of th... | [
{
"created": "Fri, 18 Jun 2010 10:00:57 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jul 2010 16:37:35 GMT",
"version": "v2"
},
{
"created": "Fri, 5 Nov 2010 17:20:48 GMT",
"version": "v3"
}
] | 2010-11-11 | [
[
"Chirco",
"Goffredo",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | A gedanken experiment in which a black hole is pushed to spin at its maximal rate by tossing into it a test body is considered. After demonstrating that this is kinematically possible for a test body made of reasonable matter, we focus on its implications for black hole thermodynamics and the apparent violation of the ... |
1208.4493 | George Zahariade | Cedric Deffayet, Jihad Mourad, George Zahariade | A note on "symmetric" vielbeins in bimetric, massive, perturbative and
non perturbative gravities | 20 pages. Section 7, prop. 6 and 7. added. Some results made more
precise | null | 10.1007/JHEP03(2013)086 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a manifold endowed with two different vielbeins $E^{A}{}_{\mu}$
and $L^{A}{}_{\mu}$ corresponding to two different metrics $g_{\mu\nu}$ and
$f_{\mu\nu}$. Such a situation arises generically in bimetric or massive
gravity (including the recently discussed version of de Rham, Gabadadze and
Tolley), as well ... | [
{
"created": "Wed, 22 Aug 2012 13:11:33 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Feb 2013 09:21:24 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Deffayet",
"Cedric",
""
],
[
"Mourad",
"Jihad",
""
],
[
"Zahariade",
"George",
""
]
] | We consider a manifold endowed with two different vielbeins $E^{A}{}_{\mu}$ and $L^{A}{}_{\mu}$ corresponding to two different metrics $g_{\mu\nu}$ and $f_{\mu\nu}$. Such a situation arises generically in bimetric or massive gravity (including the recently discussed version of de Rham, Gabadadze and Tolley), as well as... |
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