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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1410.4212 | Gabriel Bengochea | Gabriel R. Bengochea, Pedro Ca\~nate, Daniel Sudarsky | Inhomogeneities from quantum collapse scheme without inflation | 10 pages. Comments added. Replaced to match version to be published
in PLB | Phys. Lett. B 743 (2015) 484 | 10.1016/j.physletb.2015.03.016 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider the problem of the emergence of seeds of cosmic
structure in the framework of the non-inflationary model proposed by Hollands
and Wald. In particular, we consider a modification to that proposal designed
to account for breaking the symmetries of the initial quantum state, leading to
the gene... | [
{
"created": "Wed, 8 Oct 2014 18:23:57 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Mar 2015 16:27:40 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Bengochea",
"Gabriel R.",
""
],
[
"Cañate",
"Pedro",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | In this work, we consider the problem of the emergence of seeds of cosmic structure in the framework of the non-inflationary model proposed by Hollands and Wald. In particular, we consider a modification to that proposal designed to account for breaking the symmetries of the initial quantum state, leading to the genera... |
gr-qc/0209006 | Leonid Grishchuk | Stanislav V. Babak and L. P. Grishchuk | Finite-Range Gravity and Its Role in Gravitational Waves, Black Holes
and Cosmology | 56 pages including 11 figures; significant modifications; in
particular, we demonstrate the incorrectness of the widely held belief that
the non-Fierz-Pauli theories should suffer from negative energies and
instabilities; to appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D12 (2003) 1905-1960 | 10.1142/S0218271803004250 | null | gr-qc astro-ph hep-ph hep-th | null | Theoretical considerations of fundamental physics, as well as certain
cosmological observations, persistently point out to permissibility, and maybe
necessity, of macroscopic modifications of the Einstein general relativity. The
field-theoretical formulation of general relativity helped us to identify the
phenomenolo... | [
{
"created": "Tue, 3 Sep 2002 11:17:03 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Oct 2003 18:01:43 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Babak",
"Stanislav V.",
""
],
[
"Grishchuk",
"L. P.",
""
]
] | Theoretical considerations of fundamental physics, as well as certain cosmological observations, persistently point out to permissibility, and maybe necessity, of macroscopic modifications of the Einstein general relativity. The field-theoretical formulation of general relativity helped us to identify the phenomenologi... |
1701.07794 | Marco De Cesare | Marco de Cesare, R. Oliveri and J.W. van Holten | Field theoretical approach to gravitational waves | 47 pages, 3 figures, v2 matches the published version | Fortsch.Phys. 65 (2017) no.5, 1700012 | 10.1002/prop.201700012 | KCL-PH-TH/2017-06 | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of these notes is to give an accessible and self-contained
introduction to the theory of gravitational waves as the theory of a
relativistic symmetric tensor field in a Minkowski background spacetime. This
is the approach of a particle physicist: the graviton is identified with a
particular irreducible repres... | [
{
"created": "Thu, 26 Jan 2017 17:57:04 GMT",
"version": "v1"
},
{
"created": "Tue, 16 May 2017 17:25:10 GMT",
"version": "v2"
}
] | 2017-05-17 | [
[
"de Cesare",
"Marco",
""
],
[
"Oliveri",
"R.",
""
],
[
"van Holten",
"J. W.",
""
]
] | The aim of these notes is to give an accessible and self-contained introduction to the theory of gravitational waves as the theory of a relativistic symmetric tensor field in a Minkowski background spacetime. This is the approach of a particle physicist: the graviton is identified with a particular irreducible represen... |
2402.13839 | Malay K. Nandy | Vishal and Malay K. Nandy | Emergent spin and clock variable in Bianchi type-I quantum cosmology | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider the Bianchi type-I model of the universe in the Wheeler-DeWitt
quantization scheme with the matter degree of freedom represented by a scalar
field. As a consequence, the quantum mechanical equation of the universe is
obtained in the minisuperspace consisting of the Misner variables and the
scalar field. E... | [
{
"created": "Wed, 21 Feb 2024 14:35:53 GMT",
"version": "v1"
}
] | 2024-02-22 | [
[
"Vishal",
"",
""
],
[
"Nandy",
"Malay K.",
""
]
] | We consider the Bianchi type-I model of the universe in the Wheeler-DeWitt quantization scheme with the matter degree of freedom represented by a scalar field. As a consequence, the quantum mechanical equation of the universe is obtained in the minisuperspace consisting of the Misner variables and the scalar field. Emp... |
2111.13935 | Souvik Ghose | A. Saha, A. Chanda, S. Dey, B. C. Paul, S. Ghose | R\'enyi Holographic Dark Energy Models In Multidimensional Universe | 14 pages, 7 figures, accepted for publication in Int. J. Geom.
Methods Mod. Phys | null | 10.1142/S0219887822500438 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | R\'enyi Holographic Dark Energy (RHDE) Models has been studied in different
dimensions considering a flat FRW metric, subsequently exploring the nature of
evolution of different cosmological parameters. It is seen that the number of
dimensions affect the evolution of the cosmological parameters and the
transition of ... | [
{
"created": "Sat, 27 Nov 2021 16:49:35 GMT",
"version": "v1"
}
] | 2022-02-22 | [
[
"Saha",
"A.",
""
],
[
"Chanda",
"A.",
""
],
[
"Dey",
"S.",
""
],
[
"Paul",
"B. C.",
""
],
[
"Ghose",
"S.",
""
]
] | R\'enyi Holographic Dark Energy (RHDE) Models has been studied in different dimensions considering a flat FRW metric, subsequently exploring the nature of evolution of different cosmological parameters. It is seen that the number of dimensions affect the evolution of the cosmological parameters and the transition of th... |
2404.15180 | Shu-Min Wu | Shu-Min Wu, Xiao-Wei Teng, Jin-Xuan Li, Hao-Sheng Zeng, Tonghua Liu | Does anti-Unruh effect assist quantum entanglement and coherence? | 12 pages, 2 figures | New J. Phys. 26 (2024) 043016 | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we use the concepts of quantum entanglement and coherence to
analyze the Unruh and anti-Unruh effects based on the model of Unruh-DeWitt
detector. For the first time, we find that (i) the Unruh effect reduces quantum
entanglement but enhances quantum coherence; (ii) the anti-Unruh effect
enhances quant... | [
{
"created": "Tue, 23 Apr 2024 16:20:48 GMT",
"version": "v1"
}
] | 2024-04-24 | [
[
"Wu",
"Shu-Min",
""
],
[
"Teng",
"Xiao-Wei",
""
],
[
"Li",
"Jin-Xuan",
""
],
[
"Zeng",
"Hao-Sheng",
""
],
[
"Liu",
"Tonghua",
""
]
] | In this paper, we use the concepts of quantum entanglement and coherence to analyze the Unruh and anti-Unruh effects based on the model of Unruh-DeWitt detector. For the first time, we find that (i) the Unruh effect reduces quantum entanglement but enhances quantum coherence; (ii) the anti-Unruh effect enhances quantum... |
1902.07827 | Philip Beltracchi | Philip Beltracchi and Paolo Gondolo | An exact time-dependent interior Schwarzschild solution | null | Phys. Rev. D 99, 084021 (2019) | 10.1103/PhysRevD.99.084021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a time-dependent uniform-density interior Schwarzschild solution,
an exact solution to the Einstein field equations. Our solution describes the
collapse (or the time-reversed expansion) of an object from an infinite radius
to an intermediate radius of 9/8 of the Schwarzschild radius, at which time a
curvat... | [
{
"created": "Thu, 21 Feb 2019 01:09:21 GMT",
"version": "v1"
}
] | 2019-04-17 | [
[
"Beltracchi",
"Philip",
""
],
[
"Gondolo",
"Paolo",
""
]
] | We present a time-dependent uniform-density interior Schwarzschild solution, an exact solution to the Einstein field equations. Our solution describes the collapse (or the time-reversed expansion) of an object from an infinite radius to an intermediate radius of 9/8 of the Schwarzschild radius, at which time a curvatur... |
2011.04793 | Teng Zhang | Teng Zhang, Joe Bentley, Haixing Miao | A Broadband Signal Recycling Scheme for Approaching the Quantum Limit
from Optical Losses | null | null | 10.3390/galaxies9010003 | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | Quantum noise limits the sensitivity of laser interferometric
gravitational-wave detectors. Given the state-of-the-art optics, the optical
losses define the lower bound of the best possible quantum-limited detector
sensitivity. In this work, we come up with a broadband signal recycling scheme
which gives potential so... | [
{
"created": "Mon, 9 Nov 2020 21:50:20 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Dec 2020 11:53:37 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Feb 2021 11:50:03 GMT",
"version": "v3"
}
] | 2021-02-17 | [
[
"Zhang",
"Teng",
""
],
[
"Bentley",
"Joe",
""
],
[
"Miao",
"Haixing",
""
]
] | Quantum noise limits the sensitivity of laser interferometric gravitational-wave detectors. Given the state-of-the-art optics, the optical losses define the lower bound of the best possible quantum-limited detector sensitivity. In this work, we come up with a broadband signal recycling scheme which gives potential solu... |
1903.11211 | John Klauder | John R. Klauder | Quantum Gravity Made Easy | 15 pages, a novel approach to quantizing general relativity, minor
corrections; additional modifications | null | null | null | gr-qc hep-th math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravity does not naturally fit well with canonical quantization. Affine
quantization is an alternative procedure that is similar to canonical
quantization but may offer a positive result when canonical quantization fails
to offer a positive result. Two simple examples given initially illustrate the
power of affine qu... | [
{
"created": "Wed, 27 Mar 2019 01:09:23 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Mar 2019 13:28:00 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Mar 2019 02:30:51 GMT",
"version": "v3"
},
{
"created": "Mon, 12 Aug 2019 02:23:58 GMT",
"version": "v4"
},
{
"c... | 2019-10-22 | [
[
"Klauder",
"John R.",
""
]
] | Gravity does not naturally fit well with canonical quantization. Affine quantization is an alternative procedure that is similar to canonical quantization but may offer a positive result when canonical quantization fails to offer a positive result. Two simple examples given initially illustrate the power of affine quan... |
1803.01109 | Ali Reza Peivand | A.R.Peivand and K.Naficy and G.H.Bordbar | Strange quark star in dilaton gravity | null | RAA 2019 Vol. 19 No. 6, 78(14pp) | 10.1088/1674-4527/19/6/78 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we have first obtained the hydrostatic equilibrium equation in
dilaton gravity. Then we have examined some of the structural characteristics
of strange quark star in dilaton gravity with a background of Einstein gravity.
We have shown that the variations of dilaton parameter do not affect the
maximum ma... | [
{
"created": "Sat, 3 Mar 2018 05:57:37 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2018 00:21:46 GMT",
"version": "v2"
}
] | 2019-06-19 | [
[
"Peivand",
"A. R.",
""
],
[
"Naficy",
"K.",
""
],
[
"Bordbar",
"G. H.",
""
]
] | In this work, we have first obtained the hydrostatic equilibrium equation in dilaton gravity. Then we have examined some of the structural characteristics of strange quark star in dilaton gravity with a background of Einstein gravity. We have shown that the variations of dilaton parameter do not affect the maximum mass... |
gr-qc/9706039 | Joel Smoller | J. A. Smoller and A. G. Wasserman (University of Michigan) | Investigation of the Interior of Colored Black Holes and the
Extendability of Solutions of the Einstein-Yang/Mills Equations | Latex, 8 gif figures | Commun.Math.Phys.194:707-732,1998 | 10.1007/s002200050375 | null | gr-qc | null | We prove that any asymptotically flat solution to the spherically symmetric
SU(2) Einstein-Yang/Mills equations is globally defined. This result applies in
particular to the interior of colored black holes.
| [
{
"created": "Fri, 13 Jun 1997 16:31:36 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Smoller",
"J. A.",
"",
"University of Michigan"
],
[
"Wasserman",
"A. G.",
"",
"University of Michigan"
]
] | We prove that any asymptotically flat solution to the spherically symmetric SU(2) Einstein-Yang/Mills equations is globally defined. This result applies in particular to the interior of colored black holes. |
1906.08016 | Sudipta Sarkar | Rajes Ghosh, C. Fairoos, Sudipta Sarkar | Overcharging higher curvature black holes | 5 pages, no figure | Phys. Rev. D 100, 124019 (2019) | 10.1103/PhysRevD.100.124019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the problem of overcharging extremal and near-extremal black hole
solutions of Einstein-Gauss-Bonnet gravity in any dimension, generalizing the
result in general relativity. We show that as in the case of general
relativity, it is not possible to create a naked singularity by overcharging an
extremal black... | [
{
"created": "Wed, 19 Jun 2019 10:37:00 GMT",
"version": "v1"
}
] | 2019-12-11 | [
[
"Ghosh",
"Rajes",
""
],
[
"Fairoos",
"C.",
""
],
[
"Sarkar",
"Sudipta",
""
]
] | We examine the problem of overcharging extremal and near-extremal black hole solutions of Einstein-Gauss-Bonnet gravity in any dimension, generalizing the result in general relativity. We show that as in the case of general relativity, it is not possible to create a naked singularity by overcharging an extremal black h... |
2311.06470 | Antonella Cid | Antonella Cid and Israel Obreque | Modified holographic Ricci interacting dark energy models: dynamical
system analysis and bayesian comparison | 21 pages | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We perform a dynamical system analysis and a Bayesian model selection for a
new set of interacting scenarios in the framework of modified holographic Ricci
dark energy models (MHR-IDE). The dynamical analysis shows a modified radiation
epoch and a late-time attractor corresponding to dark energy. We use a
combination... | [
{
"created": "Sat, 11 Nov 2023 03:41:03 GMT",
"version": "v1"
}
] | 2023-11-14 | [
[
"Cid",
"Antonella",
""
],
[
"Obreque",
"Israel",
""
]
] | We perform a dynamical system analysis and a Bayesian model selection for a new set of interacting scenarios in the framework of modified holographic Ricci dark energy models (MHR-IDE). The dynamical analysis shows a modified radiation epoch and a late-time attractor corresponding to dark energy. We use a combination o... |
2007.12317 | Guansheng He | Guansheng He and Wenbin Lin | Roto-translational Effects on Deflection of Light and Particle by Moving
Kerr Black Hole | null | Int. J. Mod. Phys. D 23, 1450031 (2014) | 10.1142/S021827181450031X | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Velocity effects in first-order Schwarzschild deflection of light and
particles have been explored in the previous literature. In this paper, we
investigate the roto-translational-motion induced deflection by one moving Kerr
black hole with an arbitrary but constant speed. It is shown that the coupling
between the ef... | [
{
"created": "Fri, 24 Jul 2020 01:59:03 GMT",
"version": "v1"
}
] | 2020-07-27 | [
[
"He",
"Guansheng",
""
],
[
"Lin",
"Wenbin",
""
]
] | Velocity effects in first-order Schwarzschild deflection of light and particles have been explored in the previous literature. In this paper, we investigate the roto-translational-motion induced deflection by one moving Kerr black hole with an arbitrary but constant speed. It is shown that the coupling between the effe... |
1903.01958 | Chris Stevens | Anslyn John, Chris Stevens | Bondi Accretion in the Spherically Symmetric Johannsen-Psaltis Spacetime | 13 Pages, 1 figure, submitted to CQG | null | 10.1140/epjc/s10052-019-7481-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Johannsen-Psaltis spacetime explicitly violates the no hair theorem. It
describes rotating black holes with scalar hair in the form of parametric
deviations from the Kerr metric. In principle, black hole solutions in any
modified theory of gravity could be written in terms of the Johannsen-Psaltis
metric. We stud... | [
{
"created": "Tue, 5 Mar 2019 18:01:25 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"John",
"Anslyn",
""
],
[
"Stevens",
"Chris",
""
]
] | The Johannsen-Psaltis spacetime explicitly violates the no hair theorem. It describes rotating black holes with scalar hair in the form of parametric deviations from the Kerr metric. In principle, black hole solutions in any modified theory of gravity could be written in terms of the Johannsen-Psaltis metric. We study ... |
gr-qc/9502041 | Barry Haddow | Barry Haddow (Trinity College, Dublin, Ireland) | Purely Magnetic Spacetimes | 12 pages, standard latex. Submitted to Classical and Quantum Gravity. | J.Math.Phys. 36 (1995) 5848-5854 | 10.1063/1.531291 | null | gr-qc | null | Purely magnetic spacetimes, in which the Riemann tensor satisfies
$R_{abcd}u^bu^d=0$ for some unit timelike vector $u^a$, are studied. The
algebraic consequences for the Weyl and Ricci tensors are examined in detail
and consideration given to the uniqueness of $u^a$. Some remarks concerning the
nature of the congruen... | [
{
"created": "Fri, 24 Feb 1995 18:59:15 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Haddow",
"Barry",
"",
"Trinity College, Dublin, Ireland"
]
] | Purely magnetic spacetimes, in which the Riemann tensor satisfies $R_{abcd}u^bu^d=0$ for some unit timelike vector $u^a$, are studied. The algebraic consequences for the Weyl and Ricci tensors are examined in detail and consideration given to the uniqueness of $u^a$. Some remarks concerning the nature of the congruence... |
1302.6343 | Petr Tretyakov | P. Tretyakov | A new type of second order cosmological lagrangians | a few links was added | null | 10.1134/S0202289313040117 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a possible connection between Galileon gravity and
teleparallel gravity. We also propose a new type of second order cosmological
lagrangian and study a some of its properties.
| [
{
"created": "Tue, 26 Feb 2013 07:14:14 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Mar 2013 07:53:03 GMT",
"version": "v2"
}
] | 2015-06-15 | [
[
"Tretyakov",
"P.",
""
]
] | We investigate a possible connection between Galileon gravity and teleparallel gravity. We also propose a new type of second order cosmological lagrangian and study a some of its properties. |
gr-qc/9502016 | Jonathan Gratus | Jonathan Gratus, Robin W Tucker (School of Physics and Chemistry,
Lancaster University, Lancs LA1 4YB, UK) | Topology Change and the Propagation of Massless Fields | To appear in J Math Phys. 33 Pages, plain TeX, 5 Postscript figures. | J.Math.Phys. 36 (1995) 3353-3376 | 10.1063/1.531035 | null | gr-qc | null | We analyse the massless wave equation on a class of two dimensional manifolds
consisting of an arbitrary number of topological cylinders connected to one or
more topological spheres. Such manifolds are endowed with a degenerate
(non-globally hyperbolic) metric. Attention is drawn to the topological
constraints on sol... | [
{
"created": "Tue, 7 Feb 1995 21:43:43 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 1995 15:21:41 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Gratus",
"Jonathan",
"",
"School of Physics and Chemistry,\n Lancaster University, Lancs LA1 4YB, UK"
],
[
"Tucker",
"Robin W",
"",
"School of Physics and Chemistry,\n Lancaster University, Lancs LA1 4YB, UK"
]
] | We analyse the massless wave equation on a class of two dimensional manifolds consisting of an arbitrary number of topological cylinders connected to one or more topological spheres. Such manifolds are endowed with a degenerate (non-globally hyperbolic) metric. Attention is drawn to the topological constraints on solut... |
1903.05974 | Alexander Agathonov | Yu.G. Ignat'ev, A.A. Agathonov | Dynamics of cosmological models with nonlinear classical phantom scalar
fields. I. Formulation of the mathematical model | 4 figures | Ignat'ev, Y.G. & Arathonov, A.A. Russ Phys J (2019) 61: 1827.
https://doi.org/10.1007/s11182-019-01606-1 | 10.1007/s11182-019-01606-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Mathematical models describing the cosmological evolution of classical and
phantom scalar fields with self-action are formulated and analyzed. Systems of
dynamical equations in the plane, describing homogeneous cosmological models,
have been obtained. It is shown that depending on the parameters of the field
model, i... | [
{
"created": "Thu, 14 Mar 2019 13:21:53 GMT",
"version": "v1"
}
] | 2019-03-15 | [
[
"Ignat'ev",
"Yu. G.",
""
],
[
"Agathonov",
"A. A.",
""
]
] | Mathematical models describing the cosmological evolution of classical and phantom scalar fields with self-action are formulated and analyzed. Systems of dynamical equations in the plane, describing homogeneous cosmological models, have been obtained. It is shown that depending on the parameters of the field model, it ... |
gr-qc/0107007 | S. Antoci | S. Antoci, D.-E. Liebscher, and L. Mihich | Gravitational singularities via acceleration: the case of the
Schwarzschild solution and Bach's gamma metric | 8 pages; text accepted for publication by Astronomische Nachrichten | Astron.Nachr. 324 (2003) 485-488 | 10.1002/asna.200310093 | null | gr-qc astro-ph | null | The so called gamma metric corresponds to a two-parameter family of axially
symmetric, static solutions of Einstein's equations found by Bach. It contains
the Schwarzschild solution for a particular value of one of the parameters,
that rules a deviation from spherical symmetry.
It is shown that there is invariantly... | [
{
"created": "Mon, 2 Jul 2001 14:12:32 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Sep 2002 15:04:29 GMT",
"version": "v2"
},
{
"created": "Fri, 31 Jan 2003 11:15:32 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Antoci",
"S.",
""
],
[
"Liebscher",
"D. -E.",
""
],
[
"Mihich",
"L.",
""
]
] | The so called gamma metric corresponds to a two-parameter family of axially symmetric, static solutions of Einstein's equations found by Bach. It contains the Schwarzschild solution for a particular value of one of the parameters, that rules a deviation from spherical symmetry. It is shown that there is invariantly def... |
1708.03676 | Abolhassan Mohammadi | N. Nazavari, A. Mohammadi, Z. Ossoulian, Kh. Saaidi | Intermediate inflation driven by DBI scalar field | 8p pages, 6 figures, 3 tables | Phys. Rev. D 93, 123504 (2016) | 10.1103/PhysRevD.93.123504 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Picking out DBI scalar field as inflation, the slow-rolling inflationary
scenario is studied by attributing an exponential time function to scale
factor; known as intermediate inflation. The perturbation parameters of the
model are estimated numerically for two different cases and the final result is
compared with Pl... | [
{
"created": "Thu, 10 Aug 2017 04:49:28 GMT",
"version": "v1"
}
] | 2017-08-15 | [
[
"Nazavari",
"N.",
""
],
[
"Mohammadi",
"A.",
""
],
[
"Ossoulian",
"Z.",
""
],
[
"Saaidi",
"Kh.",
""
]
] | Picking out DBI scalar field as inflation, the slow-rolling inflationary scenario is studied by attributing an exponential time function to scale factor; known as intermediate inflation. The perturbation parameters of the model are estimated numerically for two different cases and the final result is compared with Plan... |
2306.01345 | Arunava Bhadra Dr. | Shubhrangshu Ghosh, Mahasweta Bhattacharya, Yanzi Sherpa and Arunava
Bhadra | Test of conformal theory of gravity as an alternative paradigm to dark
matter hypothesis from gravitational lensing studies | 9 pages | null | 10.1088/1475-7516/2023/07/008 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Weyl's conformal gravity theory, which is considered as a compelling
alternative to general relativity theory, has been claimed to describe the
observed flat rotation curve feature of spiral galaxies without the need of
invoking dark matter. However, it is important to examine whether the Weyl
theory can also explain... | [
{
"created": "Fri, 2 Jun 2023 08:18:31 GMT",
"version": "v1"
}
] | 2023-07-12 | [
[
"Ghosh",
"Shubhrangshu",
""
],
[
"Bhattacharya",
"Mahasweta",
""
],
[
"Sherpa",
"Yanzi",
""
],
[
"Bhadra",
"Arunava",
""
]
] | Weyl's conformal gravity theory, which is considered as a compelling alternative to general relativity theory, has been claimed to describe the observed flat rotation curve feature of spiral galaxies without the need of invoking dark matter. However, it is important to examine whether the Weyl theory can also explain t... |
1503.01479 | Rory Conboye | Rory Conboye | Coordinate independent expression for transverse trace-free tensors | null | Class. Quantum Grav. 33 (2016) 015008 | 10.1088/0264-9381/33/1/015008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The transverse and trace-free (TT) part of the extrinsic curvature represents
half of the dynamical degrees of freedom of the gravitational field in the $3 +
1$ formalism. As such, it is part of the freely specifiable initial data for
numerical relativity. Though TT tensors in 3-space possess only two component
degre... | [
{
"created": "Wed, 4 Mar 2015 21:21:03 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Mar 2016 18:15:44 GMT",
"version": "v2"
}
] | 2016-03-21 | [
[
"Conboye",
"Rory",
""
]
] | The transverse and trace-free (TT) part of the extrinsic curvature represents half of the dynamical degrees of freedom of the gravitational field in the $3 + 1$ formalism. As such, it is part of the freely specifiable initial data for numerical relativity. Though TT tensors in 3-space possess only two component degrees... |
gr-qc/0608040 | Brien C. Nolan | Brien C. Nolan | Odd-parity perturbations of self-similar Vaidya spacetime | 28 pages | Class.Quant.Grav. 24 (2007) 177-200 | 10.1088/0264-9381/24/1/010 | null | gr-qc | null | We carry out an analytic study of odd-parity perturbations of the
self-similar Vaidya space-times that admit a naked singularity. It is found
that an initially finite perturbation remains finite at the Cauchy horizon.
This holds not only for the gauge invariant metric and matter perturbation, but
also for all the gau... | [
{
"created": "Tue, 8 Aug 2006 13:17:29 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Nolan",
"Brien C.",
""
]
] | We carry out an analytic study of odd-parity perturbations of the self-similar Vaidya space-times that admit a naked singularity. It is found that an initially finite perturbation remains finite at the Cauchy horizon. This holds not only for the gauge invariant metric and matter perturbation, but also for all the gauge... |
1111.0232 | Hossein Farajollahi | Hossein Farajollahi, Amin Salehi | Geometric and thermodynamic properties in Gauss-Bonnet gravity | 13 pages, 13 figures, to be published in Astrophysics and Space Sci | Astrophysics and Space Science, 338, 1 187-193 (2012) | 10.1007/s10509-011-0911-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the generalized second law (GSL) of thermodynamics and entropy
is revisited in the context of cosmological models in Gauss-Bonnet gravity with
the boundary of the universe is assumed to be enclosed by the dynamical
apparent horizon. The model is best fitted with the observational data for
distance modu... | [
{
"created": "Tue, 1 Nov 2011 16:11:31 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Farajollahi",
"Hossein",
""
],
[
"Salehi",
"Amin",
""
]
] | In this paper, the generalized second law (GSL) of thermodynamics and entropy is revisited in the context of cosmological models in Gauss-Bonnet gravity with the boundary of the universe is assumed to be enclosed by the dynamical apparent horizon. The model is best fitted with the observational data for distance modulu... |
2208.08079 | Oindrila Ganguly | Shreyansh S. Dave, Oindrila Ganguly, Saumia P.S. and Ajit M.
Srivastava | Hawking radiation from acoustic black holes in hydrodynamic flow of
electrons | 7 pages, 2 figures | Europhysics Letters 139, 60003 (2022) | 10.1209/0295-5075/ac8d71 | null | gr-qc cond-mat.str-el | http://creativecommons.org/licenses/by/4.0/ | Acoustic black holes are formed when a fluid flowing with subsonic
velocities, accelerates and becomes supersonic. When the flow is directed from
the subsonic to supersonic region, the surface on which the normal component of
fluid velocity equals the local speed of sound acts as an acoustic horizon.
This is because ... | [
{
"created": "Wed, 17 Aug 2022 05:26:32 GMT",
"version": "v1"
}
] | 2022-09-20 | [
[
"Dave",
"Shreyansh S.",
""
],
[
"Ganguly",
"Oindrila",
""
],
[
"S.",
"Saumia P.",
""
],
[
"Srivastava",
"Ajit M.",
""
]
] | Acoustic black holes are formed when a fluid flowing with subsonic velocities, accelerates and becomes supersonic. When the flow is directed from the subsonic to supersonic region, the surface on which the normal component of fluid velocity equals the local speed of sound acts as an acoustic horizon. This is because no... |
2207.13754 | Huan Yang | Huan Yang, Beatrice Bonga, Zhen Pan | Dynamical Instability of Self-Gravitating Membranes | 8 pages, 3 figures. Accepted by Phys. Rev. Lett | Phys. Rev. Lett. 130, 011402 (2023) | 10.1103/PhysRevLett.130.011402 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a generic relativistic membrane with in-plane pressure and
surface density having the same sign is unstable with respect to a series of
warping mode instabilities with high wave numbers. We also examine the criteria
of instability for commonly studied exotic compact objects with membranes, such
as gravas... | [
{
"created": "Wed, 27 Jul 2022 19:15:21 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Dec 2022 14:35:25 GMT",
"version": "v2"
}
] | 2023-01-18 | [
[
"Yang",
"Huan",
""
],
[
"Bonga",
"Beatrice",
""
],
[
"Pan",
"Zhen",
""
]
] | We show that a generic relativistic membrane with in-plane pressure and surface density having the same sign is unstable with respect to a series of warping mode instabilities with high wave numbers. We also examine the criteria of instability for commonly studied exotic compact objects with membranes, such as gravasta... |
1907.03084 | Cosimo Bambi | Yuexin Zhang, Askar B. Abdikamalov, Dimitry Ayzenberg, Cosimo Bambi,
and Sourabh Nampalliwar | Tests of the Kerr hypothesis with GRS 1915+105 using different RELXILL
flavors | 11 pages, 5 figures. v2: refereed version | Astrophys.J. 884: 147 (2019) | 10.3847/1538-4357/ab4271 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous paper, we tried to test the Kerr nature of the stellar-mass
black hole in GRS 1915+105 by analyzing NuSTAR data of 2012 with our reflection
model RELXILL_NK. We found that the choice of the intensity profile of the
reflection component is crucial and eventually we were not able to get any
constraint on ... | [
{
"created": "Sat, 6 Jul 2019 06:12:59 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Oct 2019 20:30:09 GMT",
"version": "v2"
}
] | 2019-10-23 | [
[
"Zhang",
"Yuexin",
""
],
[
"Abdikamalov",
"Askar B.",
""
],
[
"Ayzenberg",
"Dimitry",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Nampalliwar",
"Sourabh",
""
]
] | In a previous paper, we tried to test the Kerr nature of the stellar-mass black hole in GRS 1915+105 by analyzing NuSTAR data of 2012 with our reflection model RELXILL_NK. We found that the choice of the intensity profile of the reflection component is crucial and eventually we were not able to get any constraint on th... |
1904.04874 | Oleg Zaslavskii | O. B. Zaslavskii | Center of mass energy of colliding electrically neutral particles and
super-Penrose process | 16 pages. Presentation improved and expanded, title changed slightly.
To appear in PRD | Phys. Rev. D 100, 024050 (2019) | 10.1103/PhysRevD.100.024050 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider collisions of electrically neutral particles in the background of
axially symmetric rotating space-times. For reactions of the kind 1+2$%
\rightarrow $3+4 we give full classification of possible scenarios based on
exact expressions for dynamic characteristics of particles 3 and 4 depending on
particles 1 ... | [
{
"created": "Tue, 9 Apr 2019 19:09:36 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Jul 2019 20:36:12 GMT",
"version": "v2"
}
] | 2019-07-31 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We consider collisions of electrically neutral particles in the background of axially symmetric rotating space-times. For reactions of the kind 1+2$% \rightarrow $3+4 we give full classification of possible scenarios based on exact expressions for dynamic characteristics of particles 3 and 4 depending on particles 1 an... |
2306.17265 | Nils Siemonsen | Nils Siemonsen and William E. East | Generic initial data for binary boson stars | 22 pages, 12 figures, updated to match published version | Phys. Rev. D 108, 124015 (2023) | 10.1103/PhysRevD.108.124015 | null | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | Binary boson stars can be used to model the nonlinear dynamics and
gravitational wave signals of merging ultracompact, but horizonless, objects.
However, doing so requires initial data satisfying the Hamiltonian and momentum
constraints of the Einstein equations, something that has not yet been
addressed. In this wor... | [
{
"created": "Thu, 29 Jun 2023 19:03:54 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2023 16:44:45 GMT",
"version": "v2"
}
] | 2023-12-05 | [
[
"Siemonsen",
"Nils",
""
],
[
"East",
"William E.",
""
]
] | Binary boson stars can be used to model the nonlinear dynamics and gravitational wave signals of merging ultracompact, but horizonless, objects. However, doing so requires initial data satisfying the Hamiltonian and momentum constraints of the Einstein equations, something that has not yet been addressed. In this work,... |
2007.14844 | Ali \"Ovg\"un Dr. | Wajiha Javed, Muhammad Bilal Khadim and Ali \"Ovg\"un | Weak Gravitational lensing by Bocharova-Bronnikov-Melnikov-Bekenstein
black holes using Gauss-bonnet theorem | 5 pages. Accepted for publication in The European Physical Journal
Plus | Eur. Phys. J. Plus 135, 595 (2020) | 10.1140/epjp/s13360-020-00619-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we demonstrate the weak gravitational lensing in the context
of Bocharova-Bronnikov-Melnikov-Bekenstein (BBMB) black hole. To this desire,
we derive the deflection angle of light in a plasma medium by BBMB black hole
using the Gibbons and Werner method. First, we obtain the Gaussian optical
curvature... | [
{
"created": "Fri, 24 Jul 2020 19:01:55 GMT",
"version": "v1"
}
] | 2020-07-30 | [
[
"Javed",
"Wajiha",
""
],
[
"Khadim",
"Muhammad Bilal",
""
],
[
"Övgün",
"Ali",
""
]
] | In this article, we demonstrate the weak gravitational lensing in the context of Bocharova-Bronnikov-Melnikov-Bekenstein (BBMB) black hole. To this desire, we derive the deflection angle of light in a plasma medium by BBMB black hole using the Gibbons and Werner method. First, we obtain the Gaussian optical curvature a... |
1608.08637 | Vitor Cardoso | Vitor Cardoso, Seth Hopper, Caio F. B. Macedo, Carlos Palenzuela,
Paolo Pani | Echoes of ECOs: gravitational-wave signatures of exotic compact objects
and of quantum corrections at the horizon scale | 13 pages, RevTex4. v2: typo in equation 7 corrected, references
added, to appear in PRD | Phys. Rev. D 94, 084031 (2016) | 10.1103/PhysRevD.94.084031 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves from binary coalescences provide one of the cleanest
signatures of the nature of compact objects. It has been recently argued that
the post-merger ringdown waveform of exotic ultracompact objects is initially
identical to that of a black-hole, and that putative corrections at the horizon
scale wil... | [
{
"created": "Tue, 30 Aug 2016 20:00:09 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Oct 2016 09:04:33 GMT",
"version": "v2"
}
] | 2016-10-26 | [
[
"Cardoso",
"Vitor",
""
],
[
"Hopper",
"Seth",
""
],
[
"Macedo",
"Caio F. B.",
""
],
[
"Palenzuela",
"Carlos",
""
],
[
"Pani",
"Paolo",
""
]
] | Gravitational waves from binary coalescences provide one of the cleanest signatures of the nature of compact objects. It has been recently argued that the post-merger ringdown waveform of exotic ultracompact objects is initially identical to that of a black-hole, and that putative corrections at the horizon scale will ... |
2102.03552 | Luis Herrera | L. Herrera | Deconstructing Frame Dragging | 14 pages Revtex. Published in Universe (Special issue: Frame-Dragging
and Gravitomagnetism) | Universe, 7, 27, (2021) | null | null | gr-qc physics.class-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | The vorticity of world lines of observers associated to the rotation of a
massive body was reported by Lense and Thirring more than a century ago. In
their example the frame dragging effect induced by the vorticity, is directly
(explicitly) related to the rotation of the source. However in many other cases
it is not ... | [
{
"created": "Sat, 6 Feb 2021 10:07:05 GMT",
"version": "v1"
}
] | 2021-02-09 | [
[
"Herrera",
"L.",
""
]
] | The vorticity of world lines of observers associated to the rotation of a massive body was reported by Lense and Thirring more than a century ago. In their example the frame dragging effect induced by the vorticity, is directly (explicitly) related to the rotation of the source. However in many other cases it is not so... |
1006.3127 | Dong-han Yeom | Bum-Hoon Lee, Wonwoo Lee, Dong-han Yeom | Dynamics of false vacuum bubbles in Brans-Dicke theory | 29 pages, 20 figures | JCAP 1101:005,2011 | 10.1088/1475-7516/2011/01/005 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of false vacuum bubbles in the Brans-Dicke theory of
gravity by using the thin shell or thin wall approximation. We consider a false
vacuum bubble that has a different value for the Brans-Dicke field between the
inside false vacuum region and the outside true vacuum region. Within a certain
limi... | [
{
"created": "Wed, 16 Jun 2010 02:59:43 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Jan 2011 11:41:43 GMT",
"version": "v2"
}
] | 2011-01-17 | [
[
"Lee",
"Bum-Hoon",
""
],
[
"Lee",
"Wonwoo",
""
],
[
"Yeom",
"Dong-han",
""
]
] | We study the dynamics of false vacuum bubbles in the Brans-Dicke theory of gravity by using the thin shell or thin wall approximation. We consider a false vacuum bubble that has a different value for the Brans-Dicke field between the inside false vacuum region and the outside true vacuum region. Within a certain limit ... |
2205.06302 | Christoph Schiller | Arun Kenath, Christoph Schiller and C. Sivaram | From maximum force to the field equations of general relativity -- and
implications | 12 pages. Selected for Honorable Mention in the Gravity Research
Foundation 2022 Awards for Essays on Gravitation. arXiv admin note:
substantial text overlap with arXiv:2112.15418 | null | 10.1142/S0218271822420196 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | There are at least two ways to deduce Einstein's field equations from the
principle of maximum force $c^4/4G$ or from the equivalent principle of maximum
power $c^5/4G$. Tests in gravitational wave astronomy, cosmology, and numerical
gravitation confirm the two principles. Apparent paradoxes about the limits can
all ... | [
{
"created": "Thu, 12 May 2022 18:32:08 GMT",
"version": "v1"
}
] | 2022-12-07 | [
[
"Kenath",
"Arun",
""
],
[
"Schiller",
"Christoph",
""
],
[
"Sivaram",
"C.",
""
]
] | There are at least two ways to deduce Einstein's field equations from the principle of maximum force $c^4/4G$ or from the equivalent principle of maximum power $c^5/4G$. Tests in gravitational wave astronomy, cosmology, and numerical gravitation confirm the two principles. Apparent paradoxes about the limits can all be... |
1012.1012 | Farhad Darabi | F. Darabi | Dynamical conformal transformation and classical Euclidean wormholes | 6 pages, minor revision | Int. J. Theor. Phys (2012) 51: 501-506 | 10.1007/s10773-011-0927-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the necessary condition for the existence of classical
Euclidean wormholes in a conformally non-invariant gravitational model
minimally coupled to an scalar field. It is shown that while the original Ricci
tensor with positive eigenvalues does not allow the Euclidean wormholes to
occur, under dynamical... | [
{
"created": "Sun, 5 Dec 2010 16:56:12 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jan 2011 12:36:58 GMT",
"version": "v2"
}
] | 2015-05-20 | [
[
"Darabi",
"F.",
""
]
] | We investigate the necessary condition for the existence of classical Euclidean wormholes in a conformally non-invariant gravitational model minimally coupled to an scalar field. It is shown that while the original Ricci tensor with positive eigenvalues does not allow the Euclidean wormholes to occur, under dynamical c... |
1210.1692 | Jong-Phil Lee | Jong-Phil Lee | Quantization of $D$-dimensional noncommutative black holes | 8 pages, 1 table, 1 figure. Comments and references added | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Noncommutative black holes in higher dimensions are investigated in the
context of holographic principle. Quantization rules for the discrete mass
spectrum are derived and compared with the continuous spectrum in the
literature. Because of the noncommutative nature of background geometry the
minimum mass to form a no... | [
{
"created": "Fri, 5 Oct 2012 09:51:07 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Oct 2012 08:47:30 GMT",
"version": "v2"
}
] | 2012-10-15 | [
[
"Lee",
"Jong-Phil",
""
]
] | Noncommutative black holes in higher dimensions are investigated in the context of holographic principle. Quantization rules for the discrete mass spectrum are derived and compared with the continuous spectrum in the literature. Because of the noncommutative nature of background geometry the minimum mass to form a nonc... |
0808.1943 | Valerio Faraoni | Valerio Faraoni and Nicolas Lanahan-Tremblay (Bishop's University) | Breakdown of the initial value formulation of scalar-tensor gravity and
its physical meaning | 14 pages, LaTex, to appear in Phys. Rev. D | Phys.Rev.D78:064017,2008 | 10.1103/PhysRevD.78.064017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit singularities of two distinct kinds in the Cauchy problem of
general scalar-tensor theories of gravity (previously discussed in the
literature), and of metric and Palatini f(R) gravity, in both their Jordan and
Einstein frame representations. Examples and toy models are used to shed light
onto the problem ... | [
{
"created": "Thu, 14 Aug 2008 05:25:08 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
],
[
"Lanahan-Tremblay",
"Nicolas",
"",
"Bishop's University"
]
] | We revisit singularities of two distinct kinds in the Cauchy problem of general scalar-tensor theories of gravity (previously discussed in the literature), and of metric and Palatini f(R) gravity, in both their Jordan and Einstein frame representations. Examples and toy models are used to shed light onto the problem an... |
0911.4161 | Jeandrew Brink | Jeandrew Brink | Formal Solution of the Fourth Order Killing equations for Stationary
Axisymmetric Vacuum Spacetimes | 5 Pages | null | 10.1103/PhysRevD.84.104015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An analytic understanding of the geodesic structure around non-Kerr
spacetimes will result in a powerful tool that could make the mapping of
spacetime around massive quiescent compact objects possible. To this end, I
present an analytic closed form expression for the components of a the fourth
order Killing tensor fo... | [
{
"created": "Sat, 21 Nov 2009 05:24:52 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Brink",
"Jeandrew",
""
]
] | An analytic understanding of the geodesic structure around non-Kerr spacetimes will result in a powerful tool that could make the mapping of spacetime around massive quiescent compact objects possible. To this end, I present an analytic closed form expression for the components of a the fourth order Killing tensor for ... |
1204.0539 | Etera R. Livine | Etera R. Livine, Mercedes Mart\'in-Benito | Group theoretical Quantization of Isotropic Loop Cosmology | 33 pages, v2: some references updated and added, minor changes in the
introduction | Phys. Rev. D85 (2012) 124052 | 10.1103/PhysRevD.85.124052 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We achieve a group theoretical quantization of the flat
Friedmann-Robertson-Walker model coupled to a massless scalar field adopting
the improved dynamics of loop quantum cosmology. Deparemeterizing the system
using the scalar field as internal time, we first identify a complete set of
phase space observables whose P... | [
{
"created": "Mon, 2 Apr 2012 21:25:32 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Apr 2012 12:49:17 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Livine",
"Etera R.",
""
],
[
"Martín-Benito",
"Mercedes",
""
]
] | We achieve a group theoretical quantization of the flat Friedmann-Robertson-Walker model coupled to a massless scalar field adopting the improved dynamics of loop quantum cosmology. Deparemeterizing the system using the scalar field as internal time, we first identify a complete set of phase space observables whose Poi... |
gr-qc/0209102 | Matthew D. Duez | Matthew D. Duez, Pedro Marronetti, Stuart L. Shapiro, and Thomas W.
Baumgarte | Hydrodynamic Simulations in 3+1 General Relativity | 24 pages, 25 figures, submitted to Physical Review D | Phys.Rev. D67 (2003) 024004 | 10.1103/PhysRevD.67.024004 | null | gr-qc astro-ph | null | We solve Einstein's field equations coupled to relativistic hydrodynamics in
full 3+1 general relativity to evolve astrophysical systems characterized by
strong gravitational fields. We model rotating, collapsing and binary stars by
idealized polytropic equations of state, with neutron stars as the main
application. ... | [
{
"created": "Thu, 26 Sep 2002 20:00:04 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Duez",
"Matthew D.",
""
],
[
"Marronetti",
"Pedro",
""
],
[
"Shapiro",
"Stuart L.",
""
],
[
"Baumgarte",
"Thomas W.",
""
]
] | We solve Einstein's field equations coupled to relativistic hydrodynamics in full 3+1 general relativity to evolve astrophysical systems characterized by strong gravitational fields. We model rotating, collapsing and binary stars by idealized polytropic equations of state, with neutron stars as the main application. Ou... |
gr-qc/0105111 | Georgii Alekseev | G.A.Alekseev | New integral equation form of integrable reductions of Einstein
equations | LaTeX, 23 pages; v2: the third displayed equation in sec. 4.6 was
corrected and the reference [25] was adjusted | Theor.Math.Phys.129:1466-1483,2001; Teor.Mat.Fiz.129:184-206,2001 | 10.1023/A:1012822904758 | null | gr-qc hep-th math-ph math.MP nlin.SI | null | A new development of the ``monodromy transform'' method for analysis of
hyperbolic as well as elliptic integrable reductions of Einstein equations is
presented. Compatibility conditions for some alternative representations of the
fundamental solutions of associated linear systems with spectral parameter in
terms of a... | [
{
"created": "Mon, 28 May 2001 16:54:34 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Aug 2001 17:12:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Alekseev",
"G. A.",
""
]
] | A new development of the ``monodromy transform'' method for analysis of hyperbolic as well as elliptic integrable reductions of Einstein equations is presented. Compatibility conditions for some alternative representations of the fundamental solutions of associated linear systems with spectral parameter in terms of a p... |
1910.11029 | Washington Chagas-Filho | W. F. Chagas-Filho | Gravitational Waves and Loop Quantum Gravity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loop Quantum Gravity is a formalism for describing the quantum mechanics of
the gravitational field based on the canonical quantization of General
Relativity. The most important result of LQG is that geometric quantities such
as area and volume are not arbitrary but are quantized in terms of a minimum
length. In this... | [
{
"created": "Thu, 24 Oct 2019 11:05:09 GMT",
"version": "v1"
}
] | 2019-10-25 | [
[
"Chagas-Filho",
"W. F.",
""
]
] | Loop Quantum Gravity is a formalism for describing the quantum mechanics of the gravitational field based on the canonical quantization of General Relativity. The most important result of LQG is that geometric quantities such as area and volume are not arbitrary but are quantized in terms of a minimum length. In this p... |
gr-qc/0010034 | Jorge Pullin | Manuela Campanelli, Gaurav Khanna, Pablo Laguna, Jorge Pullin, Michael
P. Ryan | Perturbations of the Kerr spacetime in horizon penetrating coordinates | 8 pages, RevTex, 2 figures, final version to appear in CQG | Class.Quant.Grav. 18 (2001) 1543-1554 | 10.1088/0264-9381/18/8/310 | AEI-2000-062,CGPG-00/10-01 | gr-qc | null | We derive the Teukolsky equation for perturbations of a Kerr spacetime when
the spacetime metric is written in either ingoing or outgoing Kerr-Schild form.
We also write explicit formulae for setting up the initial data for the
Teukolsky equation in the time domain in terms of a three metric and an
extrinsic curvatur... | [
{
"created": "Tue, 10 Oct 2000 04:26:27 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Mar 2001 20:49:33 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Campanelli",
"Manuela",
""
],
[
"Khanna",
"Gaurav",
""
],
[
"Laguna",
"Pablo",
""
],
[
"Pullin",
"Jorge",
""
],
[
"Ryan",
"Michael P.",
""
]
] | We derive the Teukolsky equation for perturbations of a Kerr spacetime when the spacetime metric is written in either ingoing or outgoing Kerr-Schild form. We also write explicit formulae for setting up the initial data for the Teukolsky equation in the time domain in terms of a three metric and an extrinsic curvature.... |
1503.06335 | Arvin Ravanpak | A. Ravanpak, H. Farajollahi, G. F. Fadakar | Tachyonic Intermediate Inflation in DGP Cosmology with new observations | null | Astrophys. Space Sci., 361, 43 (2016) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we study an intermediate inflationary model in the context of
Dvali-Gabadadze-Porrati (DGP) cosmology caused by a tachyon scalar field.
Considering slow-roll inflation we discuss the dynamics of the Universe. Using
perturbation theory, we estimate some of the model parameters numerically and
compare t... | [
{
"created": "Sat, 21 Mar 2015 18:00:20 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jun 2016 10:03:37 GMT",
"version": "v2"
}
] | 2016-06-02 | [
[
"Ravanpak",
"A.",
""
],
[
"Farajollahi",
"H.",
""
],
[
"Fadakar",
"G. F.",
""
]
] | In this article we study an intermediate inflationary model in the context of Dvali-Gabadadze-Porrati (DGP) cosmology caused by a tachyon scalar field. Considering slow-roll inflation we discuss the dynamics of the Universe. Using perturbation theory, we estimate some of the model parameters numerically and compare the... |
gr-qc/0512088 | Hai-Long Zhao | Hai-Long Zhao | Locally Lorentz-Covariant Theory of Gravity Founded on Inertial Frame of
Center of Mass | 16 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Locally Lorentz-covariant theory of gravity which is equivalent to general
relativity in weak gravitational field is present. The space-time standard in
local gravitational field is modified in terms of equivalence principle to keep
consistent with that of inertial frame. The static metric in our theory agrees
with... | [
{
"created": "Thu, 15 Dec 2005 10:36:37 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Mar 2006 02:10:30 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Jun 2006 12:13:17 GMT",
"version": "v3"
},
{
"created": "Fri, 25 Dec 2009 11:18:34 GMT",
"version": "v4"
},
{
"cre... | 2020-07-21 | [
[
"Zhao",
"Hai-Long",
""
]
] | A Locally Lorentz-covariant theory of gravity which is equivalent to general relativity in weak gravitational field is present. The space-time standard in local gravitational field is modified in terms of equivalence principle to keep consistent with that of inertial frame. The static metric in our theory agrees with S... |
1305.2403 | Shahn Majid | Edwin Beggs, Shahn Majid | Gravity induced from quantum spacetime | 42 pages LATEX, 4 figures; expanded on the physical significance | null | 10.1088/0264-9381/31/3/035020 | null | gr-qc hep-th math.QA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that tensoriality constraints in noncommutative Riemannian geometry
in the 2-dimensional bicrossproduct model quantum spacetime algebra
[x,t]=\lambda x drastically reduce the moduli of possible metrics g up to
normalisation to a single real parameter which we interpret as a time in the
past from which all tim... | [
{
"created": "Fri, 10 May 2013 18:29:49 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jun 2013 15:40:56 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Jun 2013 18:47:35 GMT",
"version": "v3"
},
{
"created": "Mon, 21 Oct 2013 21:43:57 GMT",
"version": "v4"
}
] | 2015-06-15 | [
[
"Beggs",
"Edwin",
""
],
[
"Majid",
"Shahn",
""
]
] | We show that tensoriality constraints in noncommutative Riemannian geometry in the 2-dimensional bicrossproduct model quantum spacetime algebra [x,t]=\lambda x drastically reduce the moduli of possible metrics g up to normalisation to a single real parameter which we interpret as a time in the past from which all timel... |
1410.5650 | Jose M. M. Senovilla | Jos\'e M. M. Senovilla | Double layers in gravity theories | 11 pages, no figures. Invited talk at the Spanish Relativity Meeting
2014 (ERE-2014), submitted to its Proceedings | null | 10.1088/1742-6596/600/1/012004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational double layers, unlike their classical electromagnetic
counterparts, are thought to be forbidden in gravity theories. It has been
recently shown, however, that they are feasible in, for instance, gravity
theories with a Lagrangian quadratic in the curvature. This is surprising with
many potential consequ... | [
{
"created": "Tue, 21 Oct 2014 13:35:10 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Senovilla",
"José M. M.",
""
]
] | Gravitational double layers, unlike their classical electromagnetic counterparts, are thought to be forbidden in gravity theories. It has been recently shown, however, that they are feasible in, for instance, gravity theories with a Lagrangian quadratic in the curvature. This is surprising with many potential consequen... |
1301.1233 | Delsate T\'erence | T. Delsate, J. Steinhoff | Eddington inspired Born Infeld Theory: A new look to the matter-coupling
paradigm | Talk presented in the 13th Marcel Grossman Meeting- AT3 session | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss some of the consequences of changing the matter to gravity
coupling without affecting the gravitational dynamics. The Einstein tensor is
usually assumed to be proportional to the stress tensor due to the divergence
free property of both object. This is not the only consistent way to couple
matter to gravit... | [
{
"created": "Mon, 7 Jan 2013 15:45:17 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jan 2013 10:08:47 GMT",
"version": "v2"
}
] | 2013-01-15 | [
[
"Delsate",
"T.",
""
],
[
"Steinhoff",
"J.",
""
]
] | We discuss some of the consequences of changing the matter to gravity coupling without affecting the gravitational dynamics. The Einstein tensor is usually assumed to be proportional to the stress tensor due to the divergence free property of both object. This is not the only consistent way to couple matter to gravity;... |
2302.02642 | Xiaolin Liu | Xiaolin Liu, Xiaokai He, and Zhoujian Cao | Accurate calculation of gravitational wave memory | 10 pages, 5 figures | null | 10.1103/PhysRevD.103.043005 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational wave memory is an important prediction of general relativity.
The detection of the gravitational wave memory can be used to test general
relativity and to deduce the property of the gravitational wave source.
Quantitative model is important for such detection and signal interpretation.
Previous works on... | [
{
"created": "Mon, 6 Feb 2023 09:27:21 GMT",
"version": "v1"
}
] | 2023-02-07 | [
[
"Liu",
"Xiaolin",
""
],
[
"He",
"Xiaokai",
""
],
[
"Cao",
"Zhoujian",
""
]
] | Gravitational wave memory is an important prediction of general relativity. The detection of the gravitational wave memory can be used to test general relativity and to deduce the property of the gravitational wave source. Quantitative model is important for such detection and signal interpretation. Previous works on g... |
1204.2019 | Miguel Zilhao | Miguel Zilhao, Vitor Cardoso, Leonardo Gualtieri, Carlos Herdeiro,
Ulrich Sperhake and Helvi Witek | Dynamics of black holes in de Sitter spacetimes | 6 pages, 5 figures | null | 10.1103/PhysRevD.85.104039 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Nonlinear dynamics in cosmological backgrounds has the potential to teach us
immensely about our universe, and also to serve as prototype for nonlinear
processes in generic curved spacetimes. Here we report on dynamical evolutions
of black holes in asymptotically de Sitter spacetimes. We focus on the head-on
collisio... | [
{
"created": "Tue, 10 Apr 2012 01:00:26 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Zilhao",
"Miguel",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Herdeiro",
"Carlos",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Witek",
"Helvi",
""
]
] | Nonlinear dynamics in cosmological backgrounds has the potential to teach us immensely about our universe, and also to serve as prototype for nonlinear processes in generic curved spacetimes. Here we report on dynamical evolutions of black holes in asymptotically de Sitter spacetimes. We focus on the head-on collision ... |
gr-qc/0308011 | Viqar Husain | Viqar Husain and Oliver Winkler | Discrete Hamiltonian evolution and quantum gravity | 8 pages, minor changes, to appear in CQG | Class.Quant.Grav. 21 (2004) 941-950 | 10.1088/0264-9381/21/4/014 | null | gr-qc hep-th | null | We study constrained Hamiltonian systems by utilizing general forms of time
discretization. We show that for explicit discretizations, the requirement of
preserving the canonical Poisson bracket under discrete evolution imposes
strong conditions on both allowable discretizations and Hamiltonians. These
conditions per... | [
{
"created": "Tue, 5 Aug 2003 19:46:01 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Dec 2003 18:35:39 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Husain",
"Viqar",
""
],
[
"Winkler",
"Oliver",
""
]
] | We study constrained Hamiltonian systems by utilizing general forms of time discretization. We show that for explicit discretizations, the requirement of preserving the canonical Poisson bracket under discrete evolution imposes strong conditions on both allowable discretizations and Hamiltonians. These conditions permi... |
1808.09216 | Christoph Charles | Christoph Charles | Abelian 2+1D Loop Quantum Gravity Coupled to a Scalar Field | 33 pages, no figure | null | 10.1007/s10714-019-2532-3 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to study 3d loop quantum gravity coupled to matter, we consider a
simplified model of abelian quantum gravity, the so-called U(1)^3 model.
Abelian gravity coupled to a scalar field shares a lot of commonalities with
parameterized field theories. We use this to develop an exact quantization of
the model. This... | [
{
"created": "Tue, 28 Aug 2018 11:00:06 GMT",
"version": "v1"
}
] | 2019-05-01 | [
[
"Charles",
"Christoph",
""
]
] | In order to study 3d loop quantum gravity coupled to matter, we consider a simplified model of abelian quantum gravity, the so-called U(1)^3 model. Abelian gravity coupled to a scalar field shares a lot of commonalities with parameterized field theories. We use this to develop an exact quantization of the model. This i... |
gr-qc/0109056 | Seth A. Major | Seth A. Major and Michael D. Seifert | Modelling Space with an Atom of Quantum Geometry | 18 pages, 11 figures | Class.Quant.Grav. 19 (2002) 2211-2228 | 10.1088/0264-9381/19/8/311 | null | gr-qc | null | Within the context of loop quantum gravity there are several operators which
measure geometry quantities. This work examines two of these operators, volume
and angle, to study quantum geometry at a single spin network vertex - ``an
atom of geometry.'' Several aspects of the angle operator are examined in
detail inclu... | [
{
"created": "Mon, 17 Sep 2001 13:16:44 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Major",
"Seth A.",
""
],
[
"Seifert",
"Michael D.",
""
]
] | Within the context of loop quantum gravity there are several operators which measure geometry quantities. This work examines two of these operators, volume and angle, to study quantum geometry at a single spin network vertex - ``an atom of geometry.'' Several aspects of the angle operator are examined in detail includi... |
2305.14179 | Ming Zhang | Jiayu Yin, Jie Jiang, Ming Zhang | Kinematic topologies of black holes | 6 pages, version accepted in PRD | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We investigate the kinematic topologies of light rings (LRs) and massive
particle rings (PRs) encircling spherical and axisymmetric black holes. Our
results demonstrate that the global topology number of LRs is consistently -1
for asymptotically flat and (Anti-)de Sitter spacetime. Additionally, we show
that the glob... | [
{
"created": "Tue, 23 May 2023 15:57:56 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Aug 2023 14:14:30 GMT",
"version": "v2"
}
] | 2023-08-17 | [
[
"Yin",
"Jiayu",
""
],
[
"Jiang",
"Jie",
""
],
[
"Zhang",
"Ming",
""
]
] | We investigate the kinematic topologies of light rings (LRs) and massive particle rings (PRs) encircling spherical and axisymmetric black holes. Our results demonstrate that the global topology number of LRs is consistently -1 for asymptotically flat and (Anti-)de Sitter spacetime. Additionally, we show that the global... |
gr-qc/0603062 | Charles Wang | Charles H.-T. Wang | Conformal decomposition in canonical general relativity | 6 pages | null | null | null | gr-qc math-ph math.MP | null | A new canonical transformation is found that enables the direct canonical
treatment of the conformal factor in general relativity. The resulting
formulation significantly simplifies the previously presented conformal
geometrodynamics. It provides a further theoretical basis for the conformal
approach to loop quantum ... | [
{
"created": "Wed, 15 Mar 2006 20:46:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wang",
"Charles H. -T.",
""
]
] | A new canonical transformation is found that enables the direct canonical treatment of the conformal factor in general relativity. The resulting formulation significantly simplifies the previously presented conformal geometrodynamics. It provides a further theoretical basis for the conformal approach to loop quantum gr... |
gr-qc/0702135 | Maria Ramos P | S. Brian Edgar, M. P. Machado Ramos | Type O pure radiation metrics with a cosmological constant | null | Gen.Rel.Grav.39:1749-1772,2007 | 10.1007/s10714-007-0487-2 | null | gr-qc | null | In this paper we complete the integration of the conformally flat pure
radiation spacetimes with a non-zero cosmological constant $\Lambda$, and $\tau
\ne 0$, by considering the case $\Lambda +\tau\bar\tau \ne 0$. This is a
further demonstration of the power and suitability of the generalised invariant
formalism (GIF... | [
{
"created": "Mon, 26 Feb 2007 12:46:49 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Edgar",
"S. Brian",
""
],
[
"Ramos",
"M. P. Machado",
""
]
] | In this paper we complete the integration of the conformally flat pure radiation spacetimes with a non-zero cosmological constant $\Lambda$, and $\tau \ne 0$, by considering the case $\Lambda +\tau\bar\tau \ne 0$. This is a further demonstration of the power and suitability of the generalised invariant formalism (GIF) ... |
2308.01301 | Alexander Zakharov | Alexander F. Zakharov | Shadows near supermassive black holes: from a theoretical concept to GR
test | 12 pages, 1 figure, presented as a talk at The 6th International
Conference on Particle Physics and Astrophysics (ICPPA-2022), accepted in
IJMPD | International Journal of Modern Physics D (2023) 2340004 | 10.1142/S0218271823400047 | null | gr-qc astro-ph.GA | http://creativecommons.org/publicdomain/zero/1.0/ | General relativity (GR) passed many astronomical tests but in majority of
them GR predictions have been tested in a weak gravitational field
approximation. Around 50 years ago a shadow has been introduced by J. Bardeen
as a purely theoretical concept but due to an enormous progress in
observational and computational ... | [
{
"created": "Wed, 2 Aug 2023 17:40:28 GMT",
"version": "v1"
}
] | 2023-09-11 | [
[
"Zakharov",
"Alexander F.",
""
]
] | General relativity (GR) passed many astronomical tests but in majority of them GR predictions have been tested in a weak gravitational field approximation. Around 50 years ago a shadow has been introduced by J. Bardeen as a purely theoretical concept but due to an enormous progress in observational and computational fa... |
gr-qc/0205066 | Matt Visser | Carlos Barcelo (Portsmouth, UK) and Matt Visser (Washington University
in Saint Louis) | Twilight for the energy conditions? | Honourable mention in the 2002 Gravity Research Foundation essay
contest. 12 pages. Plain LaTeX 2e | Int.J.Mod.Phys.D11:1553-1560,2002 | 10.1142/S0218271802002888 | null | gr-qc | null | The tension, if not outright inconsistency, between quantum physics and
general relativity is one of the great problems facing physics at the turn of
the millennium. Most often, the problems arising in merging Einstein gravity
and quantum physics are viewed as Planck scale issues (10^{19} GeV, 10^{-34} m,
10^{-45} s)... | [
{
"created": "Thu, 16 May 2002 03:05:41 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Barcelo",
"Carlos",
"",
"Portsmouth, UK"
],
[
"Visser",
"Matt",
"",
"Washington University\n in Saint Louis"
]
] | The tension, if not outright inconsistency, between quantum physics and general relativity is one of the great problems facing physics at the turn of the millennium. Most often, the problems arising in merging Einstein gravity and quantum physics are viewed as Planck scale issues (10^{19} GeV, 10^{-34} m, 10^{-45} s), ... |
2103.03190 | Riccardo Sturani | Stefano Foffa and Riccardo Sturani | Near and far zone in two-body dynamics: an effective field theory
perspective | 36 pages, 1 figure | Phys. Rev. D 104, 024069 (2021) | 10.1103/PhysRevD.104.024069 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit several aspects of the interaction of self-gravitating, slowly
varying sources with their own emitted radiation within the context of
post-Newtonian approximation to General Relativity. We discuss and clarify the
choice of boundary conditions of Green's functions used to determine
conservative potentials, ... | [
{
"created": "Thu, 4 Mar 2021 17:53:49 GMT",
"version": "v1"
}
] | 2021-08-04 | [
[
"Foffa",
"Stefano",
""
],
[
"Sturani",
"Riccardo",
""
]
] | We revisit several aspects of the interaction of self-gravitating, slowly varying sources with their own emitted radiation within the context of post-Newtonian approximation to General Relativity. We discuss and clarify the choice of boundary conditions of Green's functions used to determine conservative potentials, an... |
gr-qc/0502068 | Lorenzo Iorio | Lorenzo Iorio | The impact of the new Earth gravity models on the measurement of the
Lense-Thirring effect with a new satellite | LaTex2e, 28 pages, 2 tables, 8 figures. To appear in New Astronomy | New Astron. 10 (2005) 616-635 | 10.1016/j.newast.2005.02.006 | null | gr-qc astro-ph physics.space-ph | null | In this paper we investigate the opportunities offered by the new Earth
gravity models from the dedicated CHAMP and, especially, GRACE missions to the
project of measuring the general relativistic Lense-Thirring effect with a new
Earth's artificial satellite. It turns out that it would be possible to abandon
the stri... | [
{
"created": "Mon, 14 Feb 2005 18:54:17 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Feb 2005 19:01:46 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | In this paper we investigate the opportunities offered by the new Earth gravity models from the dedicated CHAMP and, especially, GRACE missions to the project of measuring the general relativistic Lense-Thirring effect with a new Earth's artificial satellite. It turns out that it would be possible to abandon the string... |
1909.07832 | Giorgio Sarno | Pietro Dona, Francesco Gozzini, Giorgio Sarno | Searching for classical geometries in spin foam amplitudes: a numerical
method | 21 pages, 40 figures, prepared for the Focus Issue on "Numerical
Investigations in Non-Perturbative Quantum Gravity" published in "Classical
and Quantum Gravity". V2 updates: Section 5 has been updated with a new
numerical algorithm and the preprint now matches with the published version | Class.Quant.Grav. 37 (2020) 9, 094002 | 10.1088/1361-6382/ab7ee1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a numerical method to investigate the semiclassical limit of spin
foam amplitudes with many vertices. We test it using the Ponzano-Regge model, a
spin foam model for three-dimensional euclidean gravity, and a transition
amplitude with three vertices. We study the summation over bulk spins, and we
identify ... | [
{
"created": "Tue, 17 Sep 2019 14:13:38 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Mar 2020 12:50:11 GMT",
"version": "v2"
}
] | 2024-02-27 | [
[
"Dona",
"Pietro",
""
],
[
"Gozzini",
"Francesco",
""
],
[
"Sarno",
"Giorgio",
""
]
] | We develop a numerical method to investigate the semiclassical limit of spin foam amplitudes with many vertices. We test it using the Ponzano-Regge model, a spin foam model for three-dimensional euclidean gravity, and a transition amplitude with three vertices. We study the summation over bulk spins, and we identify th... |
2301.01366 | Riasat Ali | Riasat Ali, Rimsha Babar, Muhammad Asgher, G. Mustafa | Tunneling analysis of null aether black hole theory in the background of
Newman-Janis algorithm | 11 Pages, 4 figures, Published in International Journal of Modern
Physics A | Int. J. Mod. Phys A, Vol. 37, No. 22, 2250134 (2022) | 10.1142/S0217751X22501342 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present a new asymptotically flat black hole solution in null aether
theory (NAT) by applying Newman-Janis process. For this purpose, we study the
asymptotically flat NAT black hole solution in Newman-Janis algorithm and then
compute the tunneling radiation for NAT black hole. The Hawking temperature for
NAT black... | [
{
"created": "Tue, 3 Jan 2023 21:45:12 GMT",
"version": "v1"
}
] | 2023-01-05 | [
[
"Ali",
"Riasat",
""
],
[
"Babar",
"Rimsha",
""
],
[
"Asgher",
"Muhammad",
""
],
[
"Mustafa",
"G.",
""
]
] | We present a new asymptotically flat black hole solution in null aether theory (NAT) by applying Newman-Janis process. For this purpose, we study the asymptotically flat NAT black hole solution in Newman-Janis algorithm and then compute the tunneling radiation for NAT black hole. The Hawking temperature for NAT black h... |
2105.05104 | Sebastiano Segreto | Giovanni Montani, Sebastiano Segreto | Kaluza-Klein theories in the framework of Polymer Quantum Mechanics | 12 pages, 4 figures | Phys. Rev. D 104, 064020 (2021) | 10.1103/PhysRevD.104.064020 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a re-analysis of the $5D$ Kaluza-Klein theory by implementing the
polymer representation of the dynamics, both on a classical and a quantum
level, in order to introduce in the model information about the existence of a
cut-off scale. We start by showing that, in the framework of semi-classical
quantum mech... | [
{
"created": "Tue, 11 May 2021 15:02:00 GMT",
"version": "v1"
}
] | 2021-09-15 | [
[
"Montani",
"Giovanni",
""
],
[
"Segreto",
"Sebastiano",
""
]
] | We provide a re-analysis of the $5D$ Kaluza-Klein theory by implementing the polymer representation of the dynamics, both on a classical and a quantum level, in order to introduce in the model information about the existence of a cut-off scale. We start by showing that, in the framework of semi-classical quantum mechan... |
gr-qc/0412023 | Gaurav Khanna | Matthew J. Strafuss, Gaurav Khanna | Massive scalar field instability in Kerr spacetime | 10 pages, 5 figures | Phys.Rev. D71 (2005) 024034 | 10.1103/PhysRevD.71.024034 | null | gr-qc astro-ph | null | We study the Klein-Gordon equation for a massive scalar field in Kerr
spacetime in the time-domain. We demonstrate that under conditions of
super-radiance, the scalar field becomes unstable and its amplitude grows
without bound. We also estimate the growth rate of this instability.
| [
{
"created": "Sun, 5 Dec 2004 21:54:59 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Strafuss",
"Matthew J.",
""
],
[
"Khanna",
"Gaurav",
""
]
] | We study the Klein-Gordon equation for a massive scalar field in Kerr spacetime in the time-domain. We demonstrate that under conditions of super-radiance, the scalar field becomes unstable and its amplitude grows without bound. We also estimate the growth rate of this instability. |
1610.08355 | Martin Bojowald | Martin Bojowald, Suddhasattwa Brahma, Umut Buyukcam, Fabio D'Ambrosio | Hypersurface-deformation algebroids and effective space-time models | 30 pages | Phys. Rev. D 94, 104032 (2016) | 10.1103/PhysRevD.94.104032 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In canonical gravity, covariance is implemented by brackets of
hypersurface-deformation generators forming a Lie algebroid. Lie algebroid
morphisms therefore allow one to relate different versions of the brackets that
correspond to the same space-time structure. An application to examples of
modified brackets found m... | [
{
"created": "Wed, 26 Oct 2016 14:41:25 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Bojowald",
"Martin",
""
],
[
"Brahma",
"Suddhasattwa",
""
],
[
"Buyukcam",
"Umut",
""
],
[
"D'Ambrosio",
"Fabio",
""
]
] | In canonical gravity, covariance is implemented by brackets of hypersurface-deformation generators forming a Lie algebroid. Lie algebroid morphisms therefore allow one to relate different versions of the brackets that correspond to the same space-time structure. An application to examples of modified brackets found mai... |
2306.00611 | Sergey Sushkov V | Sergey V. Sushkov, Rafkat Galeev | Cosmological models with arbitrary spatial curvature in the theory of
gravity with non-minimal derivative coupling | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate isotropic and homogeneous cosmological scenarios in the
scalar-tensor theory of gravity with non-minimal derivative coupling of a
scalar field to the curvature given by the term $(\zeta/H_0^2)
G^{\mu\nu}\nabla_\mu\phi \nabla_\nu\phi$ in the Lagrangian. In general, a
cosmological model is determined by ... | [
{
"created": "Thu, 1 Jun 2023 12:29:02 GMT",
"version": "v1"
}
] | 2023-06-02 | [
[
"Sushkov",
"Sergey V.",
""
],
[
"Galeev",
"Rafkat",
""
]
] | We investigate isotropic and homogeneous cosmological scenarios in the scalar-tensor theory of gravity with non-minimal derivative coupling of a scalar field to the curvature given by the term $(\zeta/H_0^2) G^{\mu\nu}\nabla_\mu\phi \nabla_\nu\phi$ in the Lagrangian. In general, a cosmological model is determined by si... |
gr-qc/0612098 | Roldao da Rocha | Eduardo Notte-Cuello, Roldao da Rocha, and Waldyr A. Rodrigues Jr | The Effective Lorentzian and Teleparallel Spacetimes Generated by a Free
Electromagnetic Field | A missing term in Eq.(14) has been inserted and some misprints
corrected | Rept.Math.Phys.62:69-89, 2008 | 10.1016/S0034-4877(08)80035-3 | null | gr-qc | null | In this paper we show that a free electromagnetic field living in Minkowski
spacetime generates an effective Weitzenbock or an effective Lorentzian
spacetime whose properties aredetermined in details. These results are possible
because we found using the Clifford bundle formalism the noticeable result that
the energy... | [
{
"created": "Mon, 18 Dec 2006 15:24:36 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Dec 2006 13:19:41 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Jan 2007 17:37:26 GMT",
"version": "v3"
}
] | 2009-07-21 | [
[
"Notte-Cuello",
"Eduardo",
""
],
[
"da Rocha",
"Roldao",
""
],
[
"Rodrigues",
"Waldyr A.",
"Jr"
]
] | In this paper we show that a free electromagnetic field living in Minkowski spacetime generates an effective Weitzenbock or an effective Lorentzian spacetime whose properties aredetermined in details. These results are possible because we found using the Clifford bundle formalism the noticeable result that the energy-m... |
1307.6278 | Todd Oliynyk | Todd A. Oliynyk | Lagrange coordinates for the Einstein-Euler equations | null | Phys. Rev. D 85, 044019 (2012) | 10.1103/PhysRevD.85.044019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a new symmetric hyperbolic formulation of the Einstein-Euler
equations in Lagrange coordinates that are adapted to the Frauendiener-Walton
formulation of the Euler equations. As an application, we use this system to
show that the densitized lapse and zero shift coordinate systems for the vacuum
Einstein equ... | [
{
"created": "Wed, 24 Jul 2013 01:28:05 GMT",
"version": "v1"
}
] | 2013-07-25 | [
[
"Oliynyk",
"Todd A.",
""
]
] | We derive a new symmetric hyperbolic formulation of the Einstein-Euler equations in Lagrange coordinates that are adapted to the Frauendiener-Walton formulation of the Euler equations. As an application, we use this system to show that the densitized lapse and zero shift coordinate systems for the vacuum Einstein equat... |
1603.07018 | Lukas Ifsits | Piotr T. Chru\'sciel, Lukas Ifsits | The cosmological constant and the energy of gravitational radiation | 66 pages, 1 figure | Phys. Rev. D 93, 124075 (2016) | 10.1103/PhysRevD.93.124075 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a definition of mass for characteristic hypersurfaces in
asymptotically vacuum space-times with non-vanishing cosmological constant
$\Lambda \in {\mathbb R}^*$, generalising the definition of Trautman and Bondi
for $\Lambda=0$. We show that our definition reduces to some standard
definitions in several sit... | [
{
"created": "Tue, 22 Mar 2016 22:46:36 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jul 2016 11:27:24 GMT",
"version": "v2"
}
] | 2016-07-06 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Ifsits",
"Lukas",
""
]
] | We propose a definition of mass for characteristic hypersurfaces in asymptotically vacuum space-times with non-vanishing cosmological constant $\Lambda \in {\mathbb R}^*$, generalising the definition of Trautman and Bondi for $\Lambda=0$. We show that our definition reduces to some standard definitions in several situa... |
gr-qc/0209022 | Guido Magnano | G. Magnano and L. M. Sokolowski | Nonlinear massive spin-two field generated by higher derivative gravity | null | Annals Phys. 306 (2003) 1-35 | 10.1016/S0003-4916(03)00018-6 | null | gr-qc hep-th | null | We present a systematic exposition of the Lagrangian field theory for the
massive spin-two field generated in higher-derivative gravity. It has been
noticed by various authors that this nonlinear field overcomes the well known
inconsistency of the theory for a linear massive spin-two field interacting
with Einstein's... | [
{
"created": "Sat, 7 Sep 2002 10:25:52 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Magnano",
"G.",
""
],
[
"Sokolowski",
"L. M.",
""
]
] | We present a systematic exposition of the Lagrangian field theory for the massive spin-two field generated in higher-derivative gravity. It has been noticed by various authors that this nonlinear field overcomes the well known inconsistency of the theory for a linear massive spin-two field interacting with Einstein's g... |
0710.2679 | Tamer Tlas | Daniele Oriti, Tamer Tlas | A New Class of Group Field Theories for 1st Order Discrete Quantum
Gravity | 48 pages, 4 figures, RevTeX, one reference added | Class.Quant.Grav.25:085011,2008 | 10.1088/0264-9381/25/8/085011 | DAMTP-2007-95, ITP-UU-07/53, SPIN-07/39 | gr-qc hep-th | null | Group Field Theories, a generalization of matrix models for 2d gravity,
represent a 2nd quantization of both loop quantum gravity and simplicial
quantum gravity. In this paper, we construct a new class of Group Field Theory
models, for any choice of spacetime dimension and signature, whose Feynman
amplitudes are give... | [
{
"created": "Sun, 14 Oct 2007 22:29:11 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Oct 2007 17:27:27 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Oriti",
"Daniele",
""
],
[
"Tlas",
"Tamer",
""
]
] | Group Field Theories, a generalization of matrix models for 2d gravity, represent a 2nd quantization of both loop quantum gravity and simplicial quantum gravity. In this paper, we construct a new class of Group Field Theory models, for any choice of spacetime dimension and signature, whose Feynman amplitudes are given ... |
gr-qc/9511072 | Ruth Lazkoz Saez | A. Feinstein, J. Ib\'a\~nez and Ruth Lazkoz (Dpto. F\'isica Te\'orica,
Universidad del Pa\'is Vasco, Bilbao, Spain) | Cosmologies with Two-Dimensional Inhomogeneity | 9 pages, one postscript figure | Class.Quant.Grav.12:L57-L62,1995 | 10.1088/0264-9381/12/7/001 | null | gr-qc | null | We present a new generating algorithm to construct exact non static solutions
of the Einstein field equations with two-dimensional inhomogeneity. Infinite
dimensional families of $G_1$ inhomogeneous solutions with a self interacting
scalar field, or alternatively with perfect fluid, can be constructed using
this algo... | [
{
"created": "Mon, 27 Nov 1995 15:07:48 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Feinstein",
"A.",
"",
"Dpto. Física Teórica,\n Universidad del País Vasco, Bilbao, Spain"
],
[
"Ibáñez",
"J.",
"",
"Dpto. Física Teórica,\n Universidad del País Vasco, Bilbao, Spain"
],
[
"Lazkoz",
"Ruth",
"",
"Dpto. Física Teórica,\n Universidad del Paí... | We present a new generating algorithm to construct exact non static solutions of the Einstein field equations with two-dimensional inhomogeneity. Infinite dimensional families of $G_1$ inhomogeneous solutions with a self interacting scalar field, or alternatively with perfect fluid, can be constructed using this algori... |
gr-qc/0011073 | Jose P. Mimoso | Ana Nunes (Lisbon U.), Jose P. Mimoso (Lisbon U.) and Tiago C.
Charters (ISEL) | Scaling solutions from interacting fluids | RevTeX, 21 pages, 8 figures | Phys.Rev. D63 (2001) 083506 | 10.1103/PhysRevD.63.083506 | null | gr-qc | null | We examine the dynamical implications of an interaction between some of the
fluid components of the universe. We consider the combination of three matter
components, one of which is a perfect fluid and the other two are interacting.
The interaction term generalizes the cases found in scalar field cosmologies
with an ... | [
{
"created": "Tue, 21 Nov 2000 15:49:51 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Nunes",
"Ana",
"",
"Lisbon U."
],
[
"Mimoso",
"Jose P.",
"",
"Lisbon U."
],
[
"Charters",
"Tiago C.",
"",
"ISEL"
]
] | We examine the dynamical implications of an interaction between some of the fluid components of the universe. We consider the combination of three matter components, one of which is a perfect fluid and the other two are interacting. The interaction term generalizes the cases found in scalar field cosmologies with an ex... |
1806.10437 | Francisco Lobo | Tiberiu Harko, Tomi S. Koivisto, Francisco S. N. Lobo, Gonzalo J.
Olmo, Diego Rubiera-Garcia | Coupling matter in modified $Q$-gravity | 12 pages, 4 figures | Phys. Rev. D 98, 084043 (2018) | 10.1103/PhysRevD.98.084043 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel theory of gravity by considering an extension of symmetric
teleparallel gravity. This is done by introducing, in the framework of the
metric-affine formalism, a new class of theories where the nonmetricity $Q$ is
nonminimally coupled to the matter Lagrangian. More specifically, we consider a
Lagran... | [
{
"created": "Wed, 27 Jun 2018 12:24:17 GMT",
"version": "v1"
}
] | 2018-10-31 | [
[
"Harko",
"Tiberiu",
""
],
[
"Koivisto",
"Tomi S.",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Rubiera-Garcia",
"Diego",
""
]
] | We present a novel theory of gravity by considering an extension of symmetric teleparallel gravity. This is done by introducing, in the framework of the metric-affine formalism, a new class of theories where the nonmetricity $Q$ is nonminimally coupled to the matter Lagrangian. More specifically, we consider a Lagrangi... |
1609.05285 | Albert V. Minkevich | A.V. Minkevich | Relationship of gauge gravitation theory in Riemann-Cartan spacetime and
general relativity theory | 8 pages | null | 10.1134/S0202289317040144 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The simplest variant of gauge gravitation theory in Riemann-Cartan spacetime
leading to the solution of the problem of cosmological singularity and dark
energy problem is investigated. It is shown that this theory by certain
restrictions on indefinite parameters of gravitational Lagrangian in the case
of usual gravit... | [
{
"created": "Sat, 17 Sep 2016 05:39:14 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2017 14:20:19 GMT",
"version": "v2"
}
] | 2017-12-06 | [
[
"Minkevich",
"A. V.",
""
]
] | The simplest variant of gauge gravitation theory in Riemann-Cartan spacetime leading to the solution of the problem of cosmological singularity and dark energy problem is investigated. It is shown that this theory by certain restrictions on indefinite parameters of gravitational Lagrangian in the case of usual gravitat... |
gr-qc/9906032 | Felix Finster | Felix Finster, Joel Smoller, and Shing-Tung Yau | The Coupling of Gravity to Spin and Electromagnetism | 5 pages, LaTeX, 2 figures | Mod.Phys.Lett. A14 (1999) 1053-1057 | 10.1142/S0217732399001115 | null | gr-qc | null | The coupled Einstein-Dirac-Maxwell equations are considered for a static,
spherically symmetric system of two fermions in a singlet spinor state. Stable
soliton-like solutions are shown to exist, and we discuss the regularizing
effect of gravity from a Feynman diagram point of view.
| [
{
"created": "Wed, 9 Jun 1999 20:05:19 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Finster",
"Felix",
""
],
[
"Smoller",
"Joel",
""
],
[
"Yau",
"Shing-Tung",
""
]
] | The coupled Einstein-Dirac-Maxwell equations are considered for a static, spherically symmetric system of two fermions in a singlet spinor state. Stable soliton-like solutions are shown to exist, and we discuss the regularizing effect of gravity from a Feynman diagram point of view. |
0805.2309 | Francisco Lobo | Francisco S. N. Lobo | Comment to ''On Anisotropic Dark Energy Stars'' | 4 pages. V2: typo corrected in Ref.[4] | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The authors of the paper ''On Anisotropic Dark Energy Stars'',
arXiv:0803.2508 [gr-qc], consider the equations of state $p_r=\omega \rho$ and
$p_t=\omega \rho$, ignoring the fact that this implies an isotropic pressure,
which places strict restrictions on the values of $\omega$. The authors then
argue for an anisotro... | [
{
"created": "Thu, 15 May 2008 14:10:42 GMT",
"version": "v1"
},
{
"created": "Wed, 21 May 2008 14:26:12 GMT",
"version": "v2"
}
] | 2008-05-21 | [
[
"Lobo",
"Francisco S. N.",
""
]
] | The authors of the paper ''On Anisotropic Dark Energy Stars'', arXiv:0803.2508 [gr-qc], consider the equations of state $p_r=\omega \rho$ and $p_t=\omega \rho$, ignoring the fact that this implies an isotropic pressure, which places strict restrictions on the values of $\omega$. The authors then argue for an anisotropi... |
1506.05949 | Alasdair Routh | Eric Bergshoeff, Wout Merbis, Alasdair J. Routh and Paul K. Townsend | The Third Way to 3D Gravity | Written for the Gravity Research Foundation essay competition 2015,
received an honorable mention | null | 10.1142/S0218271815440150 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Consistency of Einstein's gravitational field equation $G_{\mu\nu} \propto
T_{\mu\nu}$ imposes a "conservation condition" on the $T$-tensor that is
satisfied by (i) matter stress tensors, as a consequence of the matter
equations of motion, and (ii) identically by certain other tensors, such as the
metric tensor. Howe... | [
{
"created": "Fri, 19 Jun 2015 10:22:30 GMT",
"version": "v1"
}
] | 2015-12-09 | [
[
"Bergshoeff",
"Eric",
""
],
[
"Merbis",
"Wout",
""
],
[
"Routh",
"Alasdair J.",
""
],
[
"Townsend",
"Paul K.",
""
]
] | Consistency of Einstein's gravitational field equation $G_{\mu\nu} \propto T_{\mu\nu}$ imposes a "conservation condition" on the $T$-tensor that is satisfied by (i) matter stress tensors, as a consequence of the matter equations of motion, and (ii) identically by certain other tensors, such as the metric tensor. Howeve... |
1408.4588 | Brynjar Arnfinnsson | Brynjar Arnfinnsson and {\O}yvind Gr{\o}n | A source of the C-metric with perfect translational inertial dragging | 20 pages, 6 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new source of the C-metric is described using Israel's formalism. This
source is a singular accelerated shell. By construction, perfect inertial
dragging is realized inside the shell. The equation of state and energy
conditions for the shell are discussed.
| [
{
"created": "Wed, 20 Aug 2014 10:00:16 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Sep 2014 13:32:48 GMT",
"version": "v2"
}
] | 2014-09-23 | [
[
"Arnfinnsson",
"Brynjar",
""
],
[
"Grøn",
"Øyvind",
""
]
] | A new source of the C-metric is described using Israel's formalism. This source is a singular accelerated shell. By construction, perfect inertial dragging is realized inside the shell. The equation of state and energy conditions for the shell are discussed. |
gr-qc/0410090 | Soon-Tae Hong | Soon-Tae Hong | Warped products and FRW cosmology | 4 pages | J.Korean Phys.Soc. 45 (2004) S95-S98 | null | null | gr-qc | null | We study the Friedmann-Robertson-Walker cosmological model to investigate
non-smooth curvatures associated with multiple discontinuities involved in the
evolution of the universe, by exploiting Lorentzian warped product scheme.
Introducing double discontinuities occurred at the radiation-matter and
matter-lambda phas... | [
{
"created": "Tue, 19 Oct 2004 05:14:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hong",
"Soon-Tae",
""
]
] | We study the Friedmann-Robertson-Walker cosmological model to investigate non-smooth curvatures associated with multiple discontinuities involved in the evolution of the universe, by exploiting Lorentzian warped product scheme. Introducing double discontinuities occurred at the radiation-matter and matter-lambda phase ... |
2212.14535 | Wen-Cong Gan | Wen-Cong Gan, Xiao-Mei Kuang, Zhen-Hao Yang, Yungui Gong, Anzhong
Wang, Bin Wang | Nonexistence of quantum black and white hole horizons in an improved
dynamic approach | revtex4-2, 6 figures, and two tables, v2: typos corrected, references
added, v3: Additional analyses were provided, including new references and
figures, while the conclusions remain the same, v4: to appear in SCIENCE
CHINA Physics, Mechanics & Astronomy, v5: published version in SCIENCE CHINA
Physics, Mechanic... | Sci.China Phys.Mech.Astron. 67 (2024) 8, 280411 | 10.1007/s11433-024-2386-3 | null | gr-qc astro-ph.GA hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we study the quantum geometric effects near the locations
where classical black hole horizons used to appear in Einstein's classical
theory, within the framework of an improved dynamic approach, in which the
internal region of a black hole is modeled by the Kantowski-Sachs (KS)
spacetime and the two po... | [
{
"created": "Fri, 30 Dec 2022 03:36:41 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jan 2023 03:10:17 GMT",
"version": "v2"
},
{
"created": "Sun, 5 Feb 2023 02:45:38 GMT",
"version": "v3"
},
{
"created": "Wed, 27 Mar 2024 09:04:22 GMT",
"version": "v4"
},
{
"cr... | 2024-08-01 | [
[
"Gan",
"Wen-Cong",
""
],
[
"Kuang",
"Xiao-Mei",
""
],
[
"Yang",
"Zhen-Hao",
""
],
[
"Gong",
"Yungui",
""
],
[
"Wang",
"Anzhong",
""
],
[
"Wang",
"Bin",
""
]
] | In this paper, we study the quantum geometric effects near the locations where classical black hole horizons used to appear in Einstein's classical theory, within the framework of an improved dynamic approach, in which the internal region of a black hole is modeled by the Kantowski-Sachs (KS) spacetime and the two poly... |
1906.03642 | Edward Anderson | Edward Anderson | A Local Resolution of the Problem of Time. IX. Spacetime
Constructability | 15 pages including 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming Temporal and Configurational Relationalism, GR as Geometrodynamic's
DeWitt supermetric alongside local Lorentzian Relativity with its universal
finite maximum propagation speed arises as one of very few options from Feeding
Families through a Dirac-type Algorithm for Consistency. This amounts to
Spacetime Co... | [
{
"created": "Sun, 9 Jun 2019 13:50:25 GMT",
"version": "v1"
}
] | 2019-06-11 | [
[
"Anderson",
"Edward",
""
]
] | Assuming Temporal and Configurational Relationalism, GR as Geometrodynamic's DeWitt supermetric alongside local Lorentzian Relativity with its universal finite maximum propagation speed arises as one of very few options from Feeding Families through a Dirac-type Algorithm for Consistency. This amounts to Spacetime Cons... |
1009.2169 | Daniele Malafarina | Daniele Malafarina and Pankaj S. Joshi | Gravitational collapse with non-vanishing tangential pressure | 16 pages, 4 figures | Int. J. Mod. Phys. D, 20(4), 463 (2011) | 10.1142/S021827181101890 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the general formalism for spherical gravitational collapse developed in
[1], we investigate here the final fate of a spherical distribution of a matter
cloud, where radial pressures vanish but tangential pressures are non-zero.
Within this framework, firstly we examine the effect of introducing a generic
small ... | [
{
"created": "Sat, 11 Sep 2010 13:53:36 GMT",
"version": "v1"
},
{
"created": "Fri, 6 May 2011 12:52:44 GMT",
"version": "v2"
}
] | 2011-05-09 | [
[
"Malafarina",
"Daniele",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | Using the general formalism for spherical gravitational collapse developed in [1], we investigate here the final fate of a spherical distribution of a matter cloud, where radial pressures vanish but tangential pressures are non-zero. Within this framework, firstly we examine the effect of introducing a generic small pr... |
gr-qc/0511142 | Irina Radinschi | I. Radinschi (Physics Department, "Gh. Asachi" Technical University,
Iasi, Romania) | KKW Analysis for the Dyadosphere of a Charged Black Hole | LaTex | null | null | null | gr-qc | null | The Keski-Vakkuri, Kraus and Wilczek (KKW) analysis is used to compute the
temperature and entropy in the dyadosphere of a charged black hole solution.
For our purpose we choose the dyadosphere region of the Reissner-Nordstrom
black hole solution. Our results show that the expressions of the temperature
and entropy i... | [
{
"created": "Mon, 28 Nov 2005 16:19:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Radinschi",
"I.",
"",
"Physics Department, \"Gh. Asachi\" Technical University,\n Iasi, Romania"
]
] | The Keski-Vakkuri, Kraus and Wilczek (KKW) analysis is used to compute the temperature and entropy in the dyadosphere of a charged black hole solution. For our purpose we choose the dyadosphere region of the Reissner-Nordstrom black hole solution. Our results show that the expressions of the temperature and entropy in ... |
gr-qc/9509017 | Elias Kiritsis | Elias Kiritsis and Costas Kounnas | String Gravity and Cosmology: Some new ideas | To appear in the proceedings of the Four Seas Conference, Trieste,
June 1995 | null | null | CERN-TH/95-224, LPTENS-95/42 | gr-qc | null | String theory provides the only consistent framework so far that unifies all
interactions including gravity. We discuss gravity and cosmology in string
theory. Conventional notions from general relativity like geometry, topology
etc. are well defined only as low energy approximations in string theory. At
small distan... | [
{
"created": "Fri, 8 Sep 1995 18:04:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kiritsis",
"Elias",
""
],
[
"Kounnas",
"Costas",
""
]
] | String theory provides the only consistent framework so far that unifies all interactions including gravity. We discuss gravity and cosmology in string theory. Conventional notions from general relativity like geometry, topology etc. are well defined only as low energy approximations in string theory. At small distance... |
2008.07315 | Ram Gopal Vishwakarma | Ram Gopal Vishwakarma | A New Weyl-like Tensor of Geometric Origin | Published in JMP | J. Math. Phys. 59 (2018) 4, 042505 | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A set of new tensors of purely geometric origin have been investigated, which
form a hierarchy. A tensor of a lower rank plays the role of the potential for
the tensor of one rank higher. The tensors have interesting mathematical and
physical properties. The highest rank-tensor of the hierarchy, possesses all
the geo... | [
{
"created": "Wed, 12 Aug 2020 21:43:45 GMT",
"version": "v1"
}
] | 2020-08-20 | [
[
"Vishwakarma",
"Ram Gopal",
""
]
] | A set of new tensors of purely geometric origin have been investigated, which form a hierarchy. A tensor of a lower rank plays the role of the potential for the tensor of one rank higher. The tensors have interesting mathematical and physical properties. The highest rank-tensor of the hierarchy, possesses all the geome... |
1012.4595 | Ernesto Nungesser | Ernesto Nungesser | Late-time behaviour of the Einstein-Vlasov system with Bianchi I
symmetry | 4 pages, based on a talk given at the Spanish Relativity Meeting
2010, to appear in Journal of Physics: Conference Series (JPCS) | 2011 J. Phys.: Conf. Ser. 314 012097 | 10.1088/1742-6596/314/1/012097 | AEI-2010-184 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The late-time behaviour of the Einstein-dust system is well understood for
homogeneous spacetimes. For the case of Bianchi I we have been able to show
that the late-time behaviour of the Einstein-Vlasov system is well approximated
by the Einstein-dust system assuming that one is close to the unique stationary
solutio... | [
{
"created": "Tue, 21 Dec 2010 10:49:39 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Nungesser",
"Ernesto",
""
]
] | The late-time behaviour of the Einstein-dust system is well understood for homogeneous spacetimes. For the case of Bianchi I we have been able to show that the late-time behaviour of the Einstein-Vlasov system is well approximated by the Einstein-dust system assuming that one is close to the unique stationary solution ... |
1802.08576 | Justin Feng | Justin C. Feng | Volume average regularization for the Wheeler-DeWitt equation | 22 pages. Revised to match published version. Note added in proof
containing additional references | Phys. Rev. D 98, 026024 (2018) | 10.1103/PhysRevD.98.026024 | UTTG-04-18 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, I present a volume average regularization for the second
functional derivative operator that appears in the metric-basis Wheeler-DeWitt
equation. Naively, the second functional derivative operator in the
Wheeler-DeWitt equation is infinite, since it contains terms with a factor of a
delta function or... | [
{
"created": "Thu, 22 Feb 2018 18:50:48 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jun 2018 15:18:01 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Jul 2018 18:02:16 GMT",
"version": "v3"
}
] | 2018-07-31 | [
[
"Feng",
"Justin C.",
""
]
] | In this article, I present a volume average regularization for the second functional derivative operator that appears in the metric-basis Wheeler-DeWitt equation. Naively, the second functional derivative operator in the Wheeler-DeWitt equation is infinite, since it contains terms with a factor of a delta function or d... |
1101.0042 | Chen Songbai | Weiping Yao, Songbai Chen, Jiliang Jing | Quasinormal modes of a scalar perturbation coupling with Einstein's
tensor in the warped $AdS_3$ black hole spacetime | 16 pages, 4 figures, accepted for publication in Phys. Rev. D | Phys.Rev.D83:124018,2011 | 10.1103/PhysRevD.83.124018 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the quasinormal modes of a massive scalar field coupling to
Einstein's tensor in the spacelike stretched $AdS_3$ black hole spacetime. We
find that both the right-moving and left-moving quasinormal frequencies depend
not only on the warped parameter $v$ of black hole, but also on the coupling
between ... | [
{
"created": "Thu, 30 Dec 2010 07:17:53 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2011 02:41:57 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Sep 2011 11:17:36 GMT",
"version": "v3"
}
] | 2015-03-17 | [
[
"Yao",
"Weiping",
""
],
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | We have studied the quasinormal modes of a massive scalar field coupling to Einstein's tensor in the spacelike stretched $AdS_3$ black hole spacetime. We find that both the right-moving and left-moving quasinormal frequencies depend not only on the warped parameter $v$ of black hole, but also on the coupling between th... |
1610.07337 | Abdulla Al Mamon | Abdulla Al Mamon and Sudipta Das | A parametric reconstruction of the deceleration parameter | v2:substantially revised, refs added, Accepted for publication in
European Physical Journal C | null | 10.1140/epjc/s10052-017-5066-4 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work is based on a parametric reconstruction of the deceleration
parameter $q(z)$ in a model for the spatially flat FRW universe filled with
dark energy and non-relativistic matter. In cosmology, the parametric
reconstruction technique deals with an attempt to build up a model by choosing
some specific ev... | [
{
"created": "Mon, 24 Oct 2016 09:33:45 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jul 2017 05:20:34 GMT",
"version": "v2"
}
] | 2017-09-13 | [
[
"Mamon",
"Abdulla Al",
""
],
[
"Das",
"Sudipta",
""
]
] | The present work is based on a parametric reconstruction of the deceleration parameter $q(z)$ in a model for the spatially flat FRW universe filled with dark energy and non-relativistic matter. In cosmology, the parametric reconstruction technique deals with an attempt to build up a model by choosing some specific evol... |
gr-qc/9810072 | Eric Gourgoulhon | S. Bonazzola, E. Gourgoulhon and J.-A. Marck (DARC, CNRS, Observatoire
de Paris) | Numerical models of irrotational binary neutron stars in general
relativity | Minor corrections, improved figure, 5 pages, REVTeX, Phys. Rev. Lett.
in press | Phys.Rev.Lett. 82 (1999) 892-895 | 10.1103/PhysRevLett.82.892 | null | gr-qc astro-ph | null | We report on general relativistic calculations of quasiequilibrium
configurations of binary neutron stars in circular orbits with zero vorticity.
These configurations are expected to represent realistic situations as opposed
to corotating configurations. The Einstein equations are solved under the
assumption of a con... | [
{
"created": "Thu, 22 Oct 1998 06:57:44 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Dec 1998 21:44:08 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Bonazzola",
"S.",
"",
"DARC, CNRS, Observatoire\n de Paris"
],
[
"Gourgoulhon",
"E.",
"",
"DARC, CNRS, Observatoire\n de Paris"
],
[
"Marck",
"J. -A.",
"",
"DARC, CNRS, Observatoire\n de Paris"
]
] | We report on general relativistic calculations of quasiequilibrium configurations of binary neutron stars in circular orbits with zero vorticity. These configurations are expected to represent realistic situations as opposed to corotating configurations. The Einstein equations are solved under the assumption of a confo... |
2307.11611 | Shafqat Ul Islam | Sushant G. Ghosh, Shafqat Ul Islam, Sunil D. Maharaj | Rotating Kiselev Black Holes in $f(R,T)$ Gravity | 17 Pages, 11 Figures, 1 Table | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Exact solutions describing rotating black holes can provide significant
opportunities for testing modified theories of gravity, which are motivated by
the challenges posed by dark energy and dark matter. Starting with a spherical
Kiselev black hole as a seed metric, we construct rotating Kiselev black holes
within th... | [
{
"created": "Fri, 21 Jul 2023 14:31:33 GMT",
"version": "v1"
}
] | 2023-07-24 | [
[
"Ghosh",
"Sushant G.",
""
],
[
"Islam",
"Shafqat Ul",
""
],
[
"Maharaj",
"Sunil D.",
""
]
] | Exact solutions describing rotating black holes can provide significant opportunities for testing modified theories of gravity, which are motivated by the challenges posed by dark energy and dark matter. Starting with a spherical Kiselev black hole as a seed metric, we construct rotating Kiselev black holes within the ... |
gr-qc/0005031 | Clarissa-Marie Claudel | Clarissa-Marie Claudel | Black holes and closed trapped surfaces: a revision of a classic theorem | 15 pages, 4 figures. Uses the following packages: amsmath,amsthm,
amssymb, amsfonts, mathrsfs, enumerate, graphicx | null | null | null | gr-qc | null | It is standard assertion in relativity that, subject to an energy condition
and the cosmic censorship hypothesis, closed trapped surfaces are not visible
from future null infinity. A proof given by Hawking & Ellis in ''The Large
Scale Structure of Space-Time'' is flawed since it is formulated in terms of an
inadequat... | [
{
"created": "Wed, 10 May 2000 20:26:43 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jul 2000 09:12:08 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Claudel",
"Clarissa-Marie",
""
]
] | It is standard assertion in relativity that, subject to an energy condition and the cosmic censorship hypothesis, closed trapped surfaces are not visible from future null infinity. A proof given by Hawking & Ellis in ''The Large Scale Structure of Space-Time'' is flawed since it is formulated in terms of an inadequate ... |
2001.10644 | Daniel Berkowitz | Daniel Berkowitz | Closed Form Solutions For The Quantum LRS Bianchi IX and VIII Wheeler
DeWitt Equations For An Arbitrary Hartle-Hawking Ordering Parameter | 10 pages, 12 figures. The references were updated | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present the quantum LRS Bianchi IX models or, as they may be
better known, the Taub-NUT models in addition to the quantum LRS Bianchi VIII
models, both coupled to a stiff matter source. We solve their Wheeler DeWitt
equations for an arbitrary Hartle-Hawking ordering parameter using separation
of vari... | [
{
"created": "Wed, 29 Jan 2020 00:30:27 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Feb 2020 22:37:26 GMT",
"version": "v2"
}
] | 2020-02-17 | [
[
"Berkowitz",
"Daniel",
""
]
] | In this paper we present the quantum LRS Bianchi IX models or, as they may be better known, the Taub-NUT models in addition to the quantum LRS Bianchi VIII models, both coupled to a stiff matter source. We solve their Wheeler DeWitt equations for an arbitrary Hartle-Hawking ordering parameter using separation of variab... |
1106.0387 | Keisuke Izumi | Hideo Iguchi, Keisuke Izumi and Takashi Mishima | Systematic solution-generation of five-dimensional black holes | Invited review for Prog. Theor. Phys. Suppl., 33 pages, 13 figures.
v2: References added v3: published version | null | 10.1143/PTPS.189.93 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Solitonic solution-generating methods are powerful tools to construct
nontrivial black hole solutions of the higher-dimensional Einstein equations
systematically. In five dimensions particularly, the solitonic methods can be
successfully applied to the construction of asymptotically Minkowski spacetimes
with multiple... | [
{
"created": "Thu, 2 Jun 2011 08:55:31 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jun 2011 10:13:51 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Sep 2011 09:59:03 GMT",
"version": "v3"
}
] | 2015-05-28 | [
[
"Iguchi",
"Hideo",
""
],
[
"Izumi",
"Keisuke",
""
],
[
"Mishima",
"Takashi",
""
]
] | Solitonic solution-generating methods are powerful tools to construct nontrivial black hole solutions of the higher-dimensional Einstein equations systematically. In five dimensions particularly, the solitonic methods can be successfully applied to the construction of asymptotically Minkowski spacetimes with multiple h... |
gr-qc/0207103 | David D. Reid | David D. Reid | Manifold dimension of a causal set: Tests in conformally flat spacetimes | 8 pages, 8 figures | Phys.Rev. D67 (2003) 024034 | 10.1103/PhysRevD.67.024034 | null | gr-qc | null | This paper describes an approach that uses flat-spacetime dimension
estimators to estimate the manifold dimension of causal sets that can be
faithfully embedded into curved spacetimes. The approach is invariant under
coarse graining and can be implemented independently of any specific curved
spacetime. Results are gi... | [
{
"created": "Fri, 26 Jul 2002 14:02:14 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jan 2004 20:12:39 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Reid",
"David D.",
""
]
] | This paper describes an approach that uses flat-spacetime dimension estimators to estimate the manifold dimension of causal sets that can be faithfully embedded into curved spacetimes. The approach is invariant under coarse graining and can be implemented independently of any specific curved spacetime. Results are give... |
1805.05335 | Zhong-Zhi Xianyu | Lisa Randall, Zhong-Zhi Xianyu | A Direct Probe of Mass Density Near Inspiraling Binary Black Holes | 9 pages, ApJ accepted version | null | 10.3847/1538-4357/ab20c6 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Now that LIGO has revealed the existence of a large number of binary black
holes, identifying their origin becomes an important challenge. They might
originate in more isolated regions of the galaxy or alternatively they might
reside in dense environments such as galactic centers or globular clusters. In
the latter c... | [
{
"created": "Mon, 14 May 2018 18:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jun 2019 09:12:33 GMT",
"version": "v2"
}
] | 2019-07-01 | [
[
"Randall",
"Lisa",
""
],
[
"Xianyu",
"Zhong-Zhi",
""
]
] | Now that LIGO has revealed the existence of a large number of binary black holes, identifying their origin becomes an important challenge. They might originate in more isolated regions of the galaxy or alternatively they might reside in dense environments such as galactic centers or globular clusters. In the latter cas... |
gr-qc/0011024 | Avraham E. Mayo | Gilad Gour, Avraham E. Mayo | Why is the black hole entropy (almost) linear in the horizon area? | 6 pages, references added and corrected, approved for publication in
Phys. Rev. D | Phys.Rev. D63 (2001) 064005 | 10.1103/PhysRevD.63.064005 | null | gr-qc | null | We show that essentially pure classical thermodynamics is sufficient to
determine Bekenstein's formula for the black hole's entropy, $S=\eta A$. We
base our reasoning on the minimal assumption that since black body radiation is
describable by classical thermodynamics, so is the complete black hole-Hawking
radiation s... | [
{
"created": "Tue, 7 Nov 2000 13:21:27 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Dec 2000 08:23:18 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Gour",
"Gilad",
""
],
[
"Mayo",
"Avraham E.",
""
]
] | We show that essentially pure classical thermodynamics is sufficient to determine Bekenstein's formula for the black hole's entropy, $S=\eta A$. We base our reasoning on the minimal assumption that since black body radiation is describable by classical thermodynamics, so is the complete black hole-Hawking radiation sys... |
1107.3677 | Kengo Maeda | Kengo Maeda, Takashi Okamura, Jun-ichirou Koga | Inhomogeneous charged black hole solutions in asymptotically anti-de
Sitter spacetime | 11 pages, 8 figures, introduction has been clarified and typos have
been modified. Some references are added. To be published in PRD | null | 10.1103/PhysRevD.85.066003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate static inhomogeneous charged planar black hole solutions of
the Einstein-Maxwell system in an asymptotically anti-de Sitter spacetime.
Within the framework of linear perturbations, the solutions are numerically and
analytically constructed from the Reissner-Nordstr\"{o}m-AdS black hole
solution. The pe... | [
{
"created": "Tue, 19 Jul 2011 10:34:13 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2012 03:50:09 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Maeda",
"Kengo",
""
],
[
"Okamura",
"Takashi",
""
],
[
"Koga",
"Jun-ichirou",
""
]
] | We investigate static inhomogeneous charged planar black hole solutions of the Einstein-Maxwell system in an asymptotically anti-de Sitter spacetime. Within the framework of linear perturbations, the solutions are numerically and analytically constructed from the Reissner-Nordstr\"{o}m-AdS black hole solution. The pert... |
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