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0905.2846 | Alfonso Garc\'ia-Parrado G\'omez-Lobo Dr. | Alfonso Garc\'ia-Parrado G\'omez-Lobo and Jos\'e M. Mart\'in-Garc\'ia | Spinor calculus on 5-dimensional spacetimes | Convention mismatch and minor typos fixed. To appear in Journal of
Mathematical Physics | J.Math.Phys.50:122504,2009 | 10.1063/1.3256124 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Penrose's spinor calculus of 4-dimensional Lorentzian geometry is extended to
the case of 5-dimensional Lorentzian geometry. Such fruitful ideas in Penrose's
spinor calculus as the spin covariant derivative, the curvature spinors or the
definition of the spin coefficients on a spin frame can be carried over to the
sp... | [
{
"created": "Mon, 18 May 2009 09:50:27 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Oct 2009 09:46:12 GMT",
"version": "v2"
}
] | 2010-01-15 | [
[
"Gómez-Lobo",
"Alfonso García-Parrado",
""
],
[
"Martín-García",
"José M.",
""
]
] | Penrose's spinor calculus of 4-dimensional Lorentzian geometry is extended to the case of 5-dimensional Lorentzian geometry. Such fruitful ideas in Penrose's spinor calculus as the spin covariant derivative, the curvature spinors or the definition of the spin coefficients on a spin frame can be carried over to the spin... |
1110.3421 | Yousef Bisabr | Yousef Bisabr (Farzan-nahad) | Cosmic Acceleration in Brans-Dicke Cosmology | 10 Pages, 3 figures, To appear in General Relativity and Gravitation | Gen Relativ Gravit 44,427 (2012) | 10.1007/s10714-011-1281-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Brans-Dicke theory with a self-interacting potential in Einstein
conformal frame. We show that an accelerating expansion is possible in a
spatially flat universe for large values of the Brans-Dicke parameter
consistent with local gravity experiments.
| [
{
"created": "Sat, 15 Oct 2011 15:52:23 GMT",
"version": "v1"
}
] | 2012-01-26 | [
[
"Bisabr",
"Yousef",
"",
"Farzan-nahad"
]
] | We consider Brans-Dicke theory with a self-interacting potential in Einstein conformal frame. We show that an accelerating expansion is possible in a spatially flat universe for large values of the Brans-Dicke parameter consistent with local gravity experiments. |
2007.02436 | Rafael Augusto Couceiro Correa | R. A. C. Correa, P. H. R. S. Moraes, A. de Souza Dutra, O. L. Dors, W.
de Paula, and T. Frederico | Modeling Dark Matter Halos with Nonlinear Field Theories | null | Phys. Rev. D 103, 103519 (2021) | 10.1103/PhysRevD.103.103519 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work, we adopt a nonlinear scalar field theory coupled to the
gravity sector to model galactic dark matter. We found analytical solutions for
the scalar field coupled to gravity in the Newtonian limit, assuming an
isotropic spacetime and a field potential, with a position dependent form of
the superpot... | [
{
"created": "Sun, 5 Jul 2020 19:52:25 GMT",
"version": "v1"
}
] | 2021-05-19 | [
[
"Correa",
"R. A. C.",
""
],
[
"Moraes",
"P. H. R. S.",
""
],
[
"Dutra",
"A. de Souza",
""
],
[
"Dors",
"O. L.",
""
],
[
"de Paula",
"W.",
""
],
[
"Frederico",
"T.",
""
]
] | In the present work, we adopt a nonlinear scalar field theory coupled to the gravity sector to model galactic dark matter. We found analytical solutions for the scalar field coupled to gravity in the Newtonian limit, assuming an isotropic spacetime and a field potential, with a position dependent form of the superpoten... |
0805.2858 | Ronny Richter | Ronny Richter, J\"org Frauendiener | Discrete differential forms for cosmological space-times | null | SIAM J.Sci.Comput.32:1140-1158,2010 | 10.1137/080734583 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we describe applications of the numerical method of discrete
differential forms in computational GR. In particular we consider the initial
value problem for vacuum space-times that admit plane gravitational waves. As
described in an earlier paper the discrete differential form approach can
provide acc... | [
{
"created": "Mon, 19 May 2008 12:59:20 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Richter",
"Ronny",
""
],
[
"Frauendiener",
"Jörg",
""
]
] | In this article we describe applications of the numerical method of discrete differential forms in computational GR. In particular we consider the initial value problem for vacuum space-times that admit plane gravitational waves. As described in an earlier paper the discrete differential form approach can provide accur... |
0910.1008 | Jan Steinhoff | Jan Steinhoff and Han Wang | Canonical formulation of gravitating spinning objects at 3.5
post-Newtonian order | RevTeX, 19 pages, v2: published version | Phys.Rev.D81:024022,2010 | 10.1103/PhysRevD.81.024022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 3.5 post-Newtonian (PN) order is tackled by extending the canonical
formalism of Arnowitt, Deser, and Misner to spinning objects. This extension is
constructed order by order in the PN setting by utilizing the global Poincare
invariance as the important consistency condition. The formalism is valid to
linear orde... | [
{
"created": "Tue, 6 Oct 2009 14:09:25 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Feb 2010 12:23:15 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Steinhoff",
"Jan",
""
],
[
"Wang",
"Han",
""
]
] | The 3.5 post-Newtonian (PN) order is tackled by extending the canonical formalism of Arnowitt, Deser, and Misner to spinning objects. This extension is constructed order by order in the PN setting by utilizing the global Poincare invariance as the important consistency condition. The formalism is valid to linear order ... |
gr-qc/9812027 | Alexander Vilenkin | Alexander Vilenkin (Tufts University) | The quantum cosmology debate | Contribution to the debate on quantum cosmology at the COSMO-98
meeting. 9 pages, 6 figures | null | 10.1063/1.59443 | null | gr-qc astro-ph hep-th | null | I review the tunneling, Hartle-Hawking and Linde proposals for the wave
function of the universe and comment on the recent work on quantum creation of
open universes.
| [
{
"created": "Mon, 7 Dec 1998 21:32:09 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Vilenkin",
"Alexander",
"",
"Tufts University"
]
] | I review the tunneling, Hartle-Hawking and Linde proposals for the wave function of the universe and comment on the recent work on quantum creation of open universes. |
0806.2125 | Peter Graham | Savas Dimopoulos, Peter W. Graham, Jason M. Hogan, Mark A. Kasevich,
Surjeet Rajendran | An Atomic Gravitational Wave Interferometric Sensor (AGIS) | 41 pages, 19 figures; v2: revised version as in Phys. Rev. D | Phys.Rev.D78:122002,2008 | 10.1103/PhysRevD.78.122002 | null | gr-qc astro-ph hep-ph hep-th physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose two distinct atom interferometer gravitational wave detectors, one
terrestrial and another satellite-based, utilizing the core technology of the
Stanford 10 m atom interferometer presently under construction. Each
configuration compares two widely separated atom interferometers run using
common lasers. The... | [
{
"created": "Thu, 12 Jun 2008 17:19:03 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jan 2009 23:06:37 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Dimopoulos",
"Savas",
""
],
[
"Graham",
"Peter W.",
""
],
[
"Hogan",
"Jason M.",
""
],
[
"Kasevich",
"Mark A.",
""
],
[
"Rajendran",
"Surjeet",
""
]
] | We propose two distinct atom interferometer gravitational wave detectors, one terrestrial and another satellite-based, utilizing the core technology of the Stanford 10 m atom interferometer presently under construction. Each configuration compares two widely separated atom interferometers run using common lasers. The s... |
1505.07800 | Thomas Buchert | T. Buchert, M. Carfora, G.F.R. Ellis, E.W. Kolb, M.A.H. MacCallum,
J.J. Ostrowski, S. R\"as\"anen, B.F. Roukema, L. Andersson, A.A. Coley, D.L.
Wiltshire | Is there proof that backreaction of inhomogeneities is irrelevant in
cosmology? | 44 pages; comments on arXiv:1407.8084 including quotes; v2 includes
response to arXiv:1506.06452 and matches published version in CQG | Class. Quantum Grav. 32 (2015) 215021 | 10.1088/0264-9381/32/21/215021 | HIP-2015-17/TH | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | No. In a number of papers Green and Wald argue that the standard FLRW model
approximates our Universe extremely well on all scales, except close to strong
field astrophysical objects. In particular, they argue that the effect of
inhomogeneities on average properties of the Universe (backreaction) is
irrelevant. We sh... | [
{
"created": "Thu, 28 May 2015 19:01:03 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Oct 2015 07:53:02 GMT",
"version": "v2"
}
] | 2015-10-16 | [
[
"Buchert",
"T.",
""
],
[
"Carfora",
"M.",
""
],
[
"Ellis",
"G. F. R.",
""
],
[
"Kolb",
"E. W.",
""
],
[
"MacCallum",
"M. A. H.",
""
],
[
"Ostrowski",
"J. J.",
""
],
[
"Räsänen",
"S.",
""
],
[
"Rouke... | No. In a number of papers Green and Wald argue that the standard FLRW model approximates our Universe extremely well on all scales, except close to strong field astrophysical objects. In particular, they argue that the effect of inhomogeneities on average properties of the Universe (backreaction) is irrelevant. We show... |
1001.5281 | Giovanni Corvino Dr | Giovanni Corvino, Luciano Rezzolla, Sebastiano Bernuzzi, Roberto De
Pietri, Bruno Giacomazzo | On the Shear Instability in Relativistic Neutron Stars | 20 pages; accepted to the Classical and Quantum Gravity special issue
for MICRA2009 | Class. Quantum Grav. 27 (2010) 114104 | 10.1088/0264-9381/27/11/114104 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present new results on instabilities in rapidly and differentially
rotating neutron stars. We model the stars in full general relativity and
describe the stellar matter adopting a cold realistic equation of state based
on the unified SLy prescription. We provide evidence that rapidly and
differentially rotating st... | [
{
"created": "Thu, 28 Jan 2010 22:25:32 GMT",
"version": "v1"
},
{
"created": "Mon, 31 May 2010 11:23:57 GMT",
"version": "v2"
}
] | 2010-06-01 | [
[
"Corvino",
"Giovanni",
""
],
[
"Rezzolla",
"Luciano",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"De Pietri",
"Roberto",
""
],
[
"Giacomazzo",
"Bruno",
""
]
] | We present new results on instabilities in rapidly and differentially rotating neutron stars. We model the stars in full general relativity and describe the stellar matter adopting a cold realistic equation of state based on the unified SLy prescription. We provide evidence that rapidly and differentially rotating star... |
1507.03602 | Jorge Rocha | T\'erence Delsate, Jorge V. Rocha and Raphael Santarelli | Geodesic motion in equal angular momenta Myers-Perry-AdS spacetimes | 13 pages, 6 figures; v2: minor corrections, two Refs. added, matches
published version | Phys. Rev. D 92, 084028 (2015) | 10.1103/PhysRevD.92.084028 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the geodesic motion of massive and massless test particles in the
background of equally spinning Myers-Perry-anti-de Sitter (AdS) black holes in
five dimensions. By adopting a coordinate system that makes manifest the
cohomogeneity-1 property of these spacetimes, the equations of motion simplify
considerably... | [
{
"created": "Mon, 13 Jul 2015 20:02:54 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 2015 09:54:16 GMT",
"version": "v2"
}
] | 2015-10-21 | [
[
"Delsate",
"Térence",
""
],
[
"Rocha",
"Jorge V.",
""
],
[
"Santarelli",
"Raphael",
""
]
] | We study the geodesic motion of massive and massless test particles in the background of equally spinning Myers-Perry-anti-de Sitter (AdS) black holes in five dimensions. By adopting a coordinate system that makes manifest the cohomogeneity-1 property of these spacetimes, the equations of motion simplify considerably. ... |
gr-qc/0010070 | Robert T. Jantzen | Donato Bini and Robert T. Jantzen | A List of References on Spacetime Splitting and Gravitoelectromagnetism | 22 pages, LaTeX article style. Please send corrections and additions
to mailto:robert.jantzen@villanova.edu | null | 10.1142/9789812810021_0017 | null | gr-qc | null | Revised version to be published in the Proceedings of the Encuentros
Relativistas Espa\~noles, September, 2000 [ http://hades.eis.uva.es/EREs2000 ]
| [
{
"created": "Thu, 19 Oct 2000 17:06:34 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Bini",
"Donato",
""
],
[
"Jantzen",
"Robert T.",
""
]
] | Revised version to be published in the Proceedings of the Encuentros Relativistas Espa\~noles, September, 2000 [ http://hades.eis.uva.es/EREs2000 ] |
1502.05554 | Enrico Barausse | Matteo Bonetti, Enrico Barausse | Post-Newtonian constraints on Lorentz-violating gravity theories with a
MOND phenomenology | 17 pages, 2 figures; includes corrections listed in erratum submitted
to PRD (i.e. typos corrected in a few equations; results unchanged) | Phys. Rev. D 91, 084053 (2015) | 10.1103/PhysRevD.91.084053 | null | gr-qc astro-ph.GA hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the post-Newtonian expansion of a class of Lorentz-violating gravity
theories that reduce to khronometric theory (i.e. the infrared limit of Horava
gravity) in high-acceleration regimes, and reproduce the phenomenology of the
modified Newtonian dynamics (MOND) in the low-acceleration, non-relativistic
limit.... | [
{
"created": "Thu, 19 Feb 2015 12:37:00 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Apr 2015 12:23:34 GMT",
"version": "v2"
},
{
"created": "Thu, 31 Dec 2015 10:04:21 GMT",
"version": "v3"
}
] | 2016-01-01 | [
[
"Bonetti",
"Matteo",
""
],
[
"Barausse",
"Enrico",
""
]
] | We study the post-Newtonian expansion of a class of Lorentz-violating gravity theories that reduce to khronometric theory (i.e. the infrared limit of Horava gravity) in high-acceleration regimes, and reproduce the phenomenology of the modified Newtonian dynamics (MOND) in the low-acceleration, non-relativistic limit. L... |
1310.5338 | Hao Wei | Hao Wei, Xiao-Peng Yan, Ya-Nan Zhou | Cosmological Evolution of Einstein-Aether Models with Power-law-like
Potential | 15 pages, 6 tables, revtex4; v2: discussions added, Gen. Rel. Grav.
in press; v3: published version | Gen.Rel.Grav.46:1719,2014 | 10.1007/s10714-014-1719-x | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The so-called Einstein-Aether theory is General Relativity coupled (at second
derivative order) to a dynamical unit time-like vector field (the aether). It
is a Lorentz-violating theory, and gained much attention in the recent years.
In the present work, we study the cosmological evolution of Einstein-Aether
models w... | [
{
"created": "Sun, 20 Oct 2013 15:19:00 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Mar 2014 10:23:17 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Apr 2014 10:10:00 GMT",
"version": "v3"
}
] | 2014-04-16 | [
[
"Wei",
"Hao",
""
],
[
"Yan",
"Xiao-Peng",
""
],
[
"Zhou",
"Ya-Nan",
""
]
] | The so-called Einstein-Aether theory is General Relativity coupled (at second derivative order) to a dynamical unit time-like vector field (the aether). It is a Lorentz-violating theory, and gained much attention in the recent years. In the present work, we study the cosmological evolution of Einstein-Aether models wit... |
1012.2776 | Artymowski Michal | Michal Artymowski and Zygmunt Lalak | Vector fields and Loop Quantum Cosmology | 16 pages, 6 figures, plain LaTeX | JCAP09(2011)017 | 10.1088/1475-7516/2011/09/017 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of the Loop Quantum Cosmology we have analysed the holonomy
correction to the classical evolution of the simplified Bianchi I model in the
presence of vector fields. For the Universe dominated by a massive vector field
or by a combination of a scalar field and a vector field a smooth transition
between... | [
{
"created": "Mon, 13 Dec 2010 15:50:23 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Sep 2011 00:34:19 GMT",
"version": "v2"
}
] | 2015-05-20 | [
[
"Artymowski",
"Michal",
""
],
[
"Lalak",
"Zygmunt",
""
]
] | In the context of the Loop Quantum Cosmology we have analysed the holonomy correction to the classical evolution of the simplified Bianchi I model in the presence of vector fields. For the Universe dominated by a massive vector field or by a combination of a scalar field and a vector field a smooth transition between K... |
1607.08661 | Christoph Schmid | Christoph Schmid (ETH Zurich) | Einstein's equations from Einstein's inertial motion and Newton's law
for relative acceleration | 17 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that Einstein's $R^{\hat{0} \hat{0}}$ equation for nonrelativistic
matter and strong gravitational fields is identical with Newton's equation for
relative radial acceleration of neighbouring freefalling particles, spherically
averaged. These laws are explicitely identical with primary observer's (1)
space-tim... | [
{
"created": "Thu, 28 Jul 2016 23:09:05 GMT",
"version": "v1"
}
] | 2016-08-01 | [
[
"Schmid",
"Christoph",
"",
"ETH Zurich"
]
] | We show that Einstein's $R^{\hat{0} \hat{0}}$ equation for nonrelativistic matter and strong gravitational fields is identical with Newton's equation for relative radial acceleration of neighbouring freefalling particles, spherically averaged. These laws are explicitely identical with primary observer's (1) space-time ... |
0910.1735 | Remo Garattini | Remo Garattini | The Cosmological constant and the Wheeler-DeWitt Equation | Some misprints corrected. LaTeX 9 pages. Contribution given for the
Workshop on Continuum and Lattice Approaches to Quantum Gravity. Sept. 2008,
Brighton UK. To appear in the Proceedings | PoS CLAQG08:012,2011 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss how to extract information about the cosmological constant from
the Wheeler-DeWitt equation, considered as an eigenvalue of a Sturm-Liouville
problem. The equation is approximated to one loop with the help of a
variational approach with Gaussian trial wave functionals. A canonical
decomposition of modes is... | [
{
"created": "Fri, 9 Oct 2009 13:15:46 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Oct 2009 10:47:23 GMT",
"version": "v2"
}
] | 2011-08-17 | [
[
"Garattini",
"Remo",
""
]
] | We discuss how to extract information about the cosmological constant from the Wheeler-DeWitt equation, considered as an eigenvalue of a Sturm-Liouville problem. The equation is approximated to one loop with the help of a variational approach with Gaussian trial wave functionals. A canonical decomposition of modes is u... |
2308.07982 | Subhayan Maity | Subhayan Maity and Sujayita Bakra | The canonical quantization of the cosmic fluid in the pre-inflationary
era: a new kind of Emergent Universe | arXiv admin note: substantial text overlap with arXiv:2304.03914 | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The early phase of cosmic evolution is still a great topic of interest to the
cosmologist community. Especially the mechanism behind the origin of the
Universe is yet to be resolved. Most people believe in the Big Bang models
(singular origin of the Universe), but fewer of the cosmologists support in
favor of the non... | [
{
"created": "Tue, 15 Aug 2023 18:31:00 GMT",
"version": "v1"
}
] | 2023-08-17 | [
[
"Maity",
"Subhayan",
""
],
[
"Bakra",
"Sujayita",
""
]
] | The early phase of cosmic evolution is still a great topic of interest to the cosmologist community. Especially the mechanism behind the origin of the Universe is yet to be resolved. Most people believe in the Big Bang models (singular origin of the Universe), but fewer of the cosmologists support in favor of the non-s... |
gr-qc/0104079 | Florian Siebel | Florian Siebel, Peter Huebner | On the Effect of Constraint Enforcement on the Quality of Numerical
Solutions in General Relativity | 14 pages, 9 figures, accepted for publication in Phys. Rev. D | Phys.Rev. D64 (2001) 024021 | 10.1103/PhysRevD.64.024021 | null | gr-qc | null | In Brodbeck et al 1999 it has been shown that the linearised time evolution
equations of general relativity can be extended to a system whose solutions
asymptotically approach solutions of the constraints. In this paper we extend
the non-linear equations in similar ways and investigate the effect of various
possibili... | [
{
"created": "Wed, 25 Apr 2001 13:44:41 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Siebel",
"Florian",
""
],
[
"Huebner",
"Peter",
""
]
] | In Brodbeck et al 1999 it has been shown that the linearised time evolution equations of general relativity can be extended to a system whose solutions asymptotically approach solutions of the constraints. In this paper we extend the non-linear equations in similar ways and investigate the effect of various possibiliti... |
2210.01605 | Sashwat Tanay Dr. | Rickmoy Samanta, Sashwat Tanay, Leo C. Stein | Closed-form solutions of spinning, eccentric binary black holes at 1.5
post-Newtonian order | 14 pages, 3 figures | Phys. Rev. D 108, 124039; Published 14 December 2023 | 10.1103/PhysRevD.108.124039 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The closed-form solution of the 1.5 post-Newtonian (PN) accurate binary black
hole (BBH) Hamiltonian system has proven to be difficult to obtain for a long
time since its introduction in 1966. Closed-form solutions of the PN BBH
systems with arbitrary parameters (masses, spins, eccentricity) are required
for modeling... | [
{
"created": "Tue, 4 Oct 2022 13:33:08 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Nov 2023 20:44:04 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Dec 2023 02:09:26 GMT",
"version": "v3"
}
] | 2023-12-18 | [
[
"Samanta",
"Rickmoy",
""
],
[
"Tanay",
"Sashwat",
""
],
[
"Stein",
"Leo C.",
""
]
] | The closed-form solution of the 1.5 post-Newtonian (PN) accurate binary black hole (BBH) Hamiltonian system has proven to be difficult to obtain for a long time since its introduction in 1966. Closed-form solutions of the PN BBH systems with arbitrary parameters (masses, spins, eccentricity) are required for modeling t... |
gr-qc/0604117 | Hongwei Yu | Puxun Wu and Hongwei Yu | Can universe exit from phantom inflation due to gravitational back
reaction? | 9 pages, Revtex4, to appear in JCAP | JCAP 0605 (2006) 008 | 10.1088/1475-7516/2006/05/008 | null | gr-qc astro-ph | null | The effects of the gravitational back reaction of cosmological perturbations
are investigated in a phantom inflation model. The effective energy-momentum
tensor of the gravitational back reaction of cosmological perturbations whose
wavelengths are larger than the Hubble radius is calculated. Our results show
that the... | [
{
"created": "Thu, 27 Apr 2006 01:58:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wu",
"Puxun",
""
],
[
"Yu",
"Hongwei",
""
]
] | The effects of the gravitational back reaction of cosmological perturbations are investigated in a phantom inflation model. The effective energy-momentum tensor of the gravitational back reaction of cosmological perturbations whose wavelengths are larger than the Hubble radius is calculated. Our results show that the e... |
2304.10228 | David Vasak | David Vasak and J\"urgen Struckmeier | Covariant Canonical Gauge Theory of Classical Gravitation for Scalar,
Vector, and Spin-1/2 Particle Fields | Aligned with Chapter 4 of book Covariant Canonical Gauge Gravity,
Springer Nature, ISBN: 978-3-031-43716-8, eISBN: 978-3-031-43717-5. Sign
error corrected | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The framework of the Covariant Canonical Gauge theory of Gravity (CCGG) is
described in detail. CCGG emerges naturally in the Palatini formulation, where
the vierbein and the spin connection are independent fields. Neither torsion
nor non-metricity are excluded. The manifestly covariant gauge process is based
on cano... | [
{
"created": "Thu, 20 Apr 2023 11:44:25 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 2023 11:29:42 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Sep 2023 15:08:49 GMT",
"version": "v3"
},
{
"created": "Tue, 21 Nov 2023 11:01:35 GMT",
"version": "v4"
}
] | 2023-11-22 | [
[
"Vasak",
"David",
""
],
[
"Struckmeier",
"Jürgen",
""
]
] | The framework of the Covariant Canonical Gauge theory of Gravity (CCGG) is described in detail. CCGG emerges naturally in the Palatini formulation, where the vierbein and the spin connection are independent fields. Neither torsion nor non-metricity are excluded. The manifestly covariant gauge process is based on canoni... |
0804.4339 | Chao-Guang Huang | Chao-Guang Huang, Yu Tian, Xiaoning Wu, and Han-Ying Guo | On Torsion-free Vacuum Solutions of the Model of de Sitter Gauge Theory
of Gravity | 6 pages | Front.Phys.China.3:191,2008 | 10.1007/s11467-008-0023-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that all vacuum solutions of Einstein field equation with a
positive cosmological constant are the solutions of a model of dS gauge theory
of gravity. Therefore, the model is expected to pass the observational tests on
the scale of solar system and explain the indirect evidence of gravitational
wave from ... | [
{
"created": "Mon, 28 Apr 2008 07:50:35 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Huang",
"Chao-Guang",
""
],
[
"Tian",
"Yu",
""
],
[
"Wu",
"Xiaoning",
""
],
[
"Guo",
"Han-Ying",
""
]
] | It is shown that all vacuum solutions of Einstein field equation with a positive cosmological constant are the solutions of a model of dS gauge theory of gravity. Therefore, the model is expected to pass the observational tests on the scale of solar system and explain the indirect evidence of gravitational wave from th... |
1811.04948 | Shahar Hod | Shahar Hod | Analytic study of self-gravitating polytropic spheres with light rings | 7 pages | The European Physical Journal C 78, 417 (2018) | 10.1140/epjc/s10052-018-5905-y | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultra-compact objects describe horizonless solutions of the Einstein field
equations which, like black-hole spacetimes, possess null circular geodesics
(closed light rings). We study {\it analytically} the physical properties of
spherically symmetric ultra-compact isotropic fluid spheres with a polytropic
equation of... | [
{
"created": "Mon, 12 Nov 2018 19:00:04 GMT",
"version": "v1"
}
] | 2018-11-21 | [
[
"Hod",
"Shahar",
""
]
] | Ultra-compact objects describe horizonless solutions of the Einstein field equations which, like black-hole spacetimes, possess null circular geodesics (closed light rings). We study {\it analytically} the physical properties of spherically symmetric ultra-compact isotropic fluid spheres with a polytropic equation of s... |
2201.02251 | Vasilios Zarikas | Fotios K. Anagnostopoulos, Alfio Bonanno, Ayan Mitra, Vasilios Zarikas | Swiss-cheese cosmologies with variable $G$ and $\Lambda$ from the
renormalization group | 15 pages, 3 figures | Phys. Rev. D 105, 083532, 2022 | 10.1103/PhysRevD.105.083532 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | A convincing explanation for the nature of the dark energy and dark matter is
still missing. In recent works a RG-improved swiss-cheese cosmology with an
evolving cosmological constant dependent on the \sch radius has been proven to
be a promising model to explain the observed cosmic acceleration. In this work
we ext... | [
{
"created": "Thu, 6 Jan 2022 21:17:41 GMT",
"version": "v1"
}
] | 2022-05-06 | [
[
"Anagnostopoulos",
"Fotios K.",
""
],
[
"Bonanno",
"Alfio",
""
],
[
"Mitra",
"Ayan",
""
],
[
"Zarikas",
"Vasilios",
""
]
] | A convincing explanation for the nature of the dark energy and dark matter is still missing. In recent works a RG-improved swiss-cheese cosmology with an evolving cosmological constant dependent on the \sch radius has been proven to be a promising model to explain the observed cosmic acceleration. In this work we exten... |
gr-qc/0009098 | Maurizio Gasperini | M. Gasperini | Production and detection of relic dilatons in string cosmology | 2 pages, Latex, summary of the contribution presented at the IX
Marcel Grossmann Meeting (Rome, July 2000). To appear in the proceedings
(World Scientific, Singapore) | null | null | BA-TH/00-397 | gr-qc | null | This paper summarizes the contribution presented at the {\sl IX Marcel
Grossmann Meeting} (Rome, July 2000). It is stressed, in particular, that a
non-relativistic background of ultra-light dilatons, produced in the context of
string cosmology, could represent today a significant fraction of cold dark
matter. If the ... | [
{
"created": "Thu, 28 Sep 2000 18:23:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gasperini",
"M.",
""
]
] | This paper summarizes the contribution presented at the {\sl IX Marcel Grossmann Meeting} (Rome, July 2000). It is stressed, in particular, that a non-relativistic background of ultra-light dilatons, produced in the context of string cosmology, could represent today a significant fraction of cold dark matter. If the di... |
1301.5495 | Rahmede Christoph | Christoph Rahmede | The asymptotic safety scenario and scalar field inflation | Contribution to the proceedings of the Thirteenth Marcel Grossmann
Meeting, Stockholm, 2012 | null | null | KA-TP-02-2013; DO-TH 13/03 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study quantum gravity corrections to early universe cosmology as resulting
within the asymptotic safety scenario. We analyse if it is possible to obtain
accelerated expansion in the regime of the renormalisation group fixed point in
a theory with Einstein-Hilbert gravity and a scalar field. We show how this
phase ... | [
{
"created": "Wed, 23 Jan 2013 13:25:30 GMT",
"version": "v1"
}
] | 2013-01-24 | [
[
"Rahmede",
"Christoph",
""
]
] | We study quantum gravity corrections to early universe cosmology as resulting within the asymptotic safety scenario. We analyse if it is possible to obtain accelerated expansion in the regime of the renormalisation group fixed point in a theory with Einstein-Hilbert gravity and a scalar field. We show how this phase im... |
1211.3880 | Michael Reisenberger | Michael P. Reisenberger | The symplectic 2-form for gravity in terms of free null initial data | 44 pages, 2 figures | null | 10.1088/0264-9381/30/15/155022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A hypersurface formed of two null sheets, or "light fronts", swept out by the
future null normal geodesics emerging from a common spacelike 2-disk can serve
as a Cauchy surface for a region of spacetime. Already in the 1960s free
(unconstrained) initial data for general relativity were found for such
hypersurfaces. H... | [
{
"created": "Fri, 16 Nov 2012 12:54:21 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Reisenberger",
"Michael P.",
""
]
] | A hypersurface formed of two null sheets, or "light fronts", swept out by the future null normal geodesics emerging from a common spacelike 2-disk can serve as a Cauchy surface for a region of spacetime. Already in the 1960s free (unconstrained) initial data for general relativity were found for such hypersurfaces. Her... |
2305.19986 | Mordehai Milgrom | Mordehai Milgrom | Tripotential MOND theories | 8 pages. Matching the published version in Phys. Rev. D. A more
elegant, and more general, presentation of the theory and of its deep-MOND
limit. Generalized discussion of the deep-MOND limit of one-D (e.g.,
spherical) configurations | Phys. Rev. D 108, 063009 (2023) | 10.1103/PhysRevD.108.063009 | null | gr-qc astro-ph.GA hep-ph | http://creativecommons.org/licenses/by/4.0/ | I present a new class of nonrelativistic, modified-gravity MOND theories. The
three gravitational degrees of freedom of these ``TRIMOND'' theories are the
MOND potential and two auxiliary potentials, one of which emerges as the
Newtonian potential. Their Lagrangians involve a function of three acceleration
variables ... | [
{
"created": "Wed, 31 May 2023 16:09:34 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jul 2023 08:45:44 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Sep 2023 07:34:15 GMT",
"version": "v3"
}
] | 2023-09-11 | [
[
"Milgrom",
"Mordehai",
""
]
] | I present a new class of nonrelativistic, modified-gravity MOND theories. The three gravitational degrees of freedom of these ``TRIMOND'' theories are the MOND potential and two auxiliary potentials, one of which emerges as the Newtonian potential. Their Lagrangians involve a function of three acceleration variables --... |
2106.12053 | David McNutt | A. A. Coley and D. D. McNutt | Geometric Horizons: A Frame Approach | 30 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the numerical investigation of the physical merger of two black holes, it
is crucial to locate a black hole locally. This is usually done utilizing an
apparent horizon. An alternative proposal is to identify a geometric horizon
(GH), which is characterized by a surface in the spacetime on which the
curvature tenso... | [
{
"created": "Tue, 22 Jun 2021 20:33:34 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jul 2021 08:16:55 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Sep 2021 09:56:31 GMT",
"version": "v3"
}
] | 2021-09-14 | [
[
"Coley",
"A. A.",
""
],
[
"McNutt",
"D. D.",
""
]
] | In the numerical investigation of the physical merger of two black holes, it is crucial to locate a black hole locally. This is usually done utilizing an apparent horizon. An alternative proposal is to identify a geometric horizon (GH), which is characterized by a surface in the spacetime on which the curvature tensor ... |
1908.04235 | Sayak Datta | Sayak Datta, Prasanta Char | Effect of superfluid matter of neutron star on the tidal deformability | null | Phys. Rev. D 101, 064016 (2020) | 10.1103/PhysRevD.101.064016 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of superfluidity on the tidal response of a neutron star
in a general relativistic framework. In this work, we take a dual-layer
approach where the superfluid matter is confined in the core of the star. Then,
the superfluid core is encapsulated with an envelope of ordinary matter fluid
which acts ... | [
{
"created": "Mon, 12 Aug 2019 16:43:12 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Sep 2019 05:26:39 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Feb 2020 10:25:24 GMT",
"version": "v3"
},
{
"created": "Tue, 15 Sep 2020 11:04:05 GMT",
"version": "v4"
}
] | 2020-09-16 | [
[
"Datta",
"Sayak",
""
],
[
"Char",
"Prasanta",
""
]
] | We study the effect of superfluidity on the tidal response of a neutron star in a general relativistic framework. In this work, we take a dual-layer approach where the superfluid matter is confined in the core of the star. Then, the superfluid core is encapsulated with an envelope of ordinary matter fluid which acts ef... |
gr-qc/9409058 | Warner A. Miller | Arkady Kheyfets and Warner A. Miller | A Quantum-Driven Time (QDT) Quantization of the Taub Cosmology | 7 pages (compressed and uuencoded postscript file), LAUR-94-3328 | null | null | null | gr-qc | null | We present here an application of a new quantization scheme. We quantize the
Taub cosmology by quantizing only the anisotropy parameter $\beta$ and imposing
the super-Hamiltonian constraint as an expectation-value equation to recover
the relationship between the scale factor $\Omega$ and the time $t$. This
approach a... | [
{
"created": "Wed, 28 Sep 1994 21:02:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kheyfets",
"Arkady",
""
],
[
"Miller",
"Warner A.",
""
]
] | We present here an application of a new quantization scheme. We quantize the Taub cosmology by quantizing only the anisotropy parameter $\beta$ and imposing the super-Hamiltonian constraint as an expectation-value equation to recover the relationship between the scale factor $\Omega$ and the time $t$. This approach app... |
2207.03797 | Che-Yu Chen | Che-Yu Chen | On the Possible Spacetime Structures of Rotating Loop Quantum Black
Holes | 12 pages, 2 figures; contribution to the Special Issue of the
International Journal of Geometric Methods in Modern Physics dedicated to the
conference Geometric Foundations of Gravity in Tartu 2021. Version accepted
by IJGMMP | null | 10.1142/S0219887822501766 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To date, a mathematically consistent construction of effective rotating black
hole models in the context of Loop Quantum Gravity (LQG) is still lacking. In
this work, we start with the assumption that rotating LQG black hole metrics
can be effectively obtained using Newman-Janis Algorithm. Then, based on a few
extra ... | [
{
"created": "Fri, 8 Jul 2022 10:03:42 GMT",
"version": "v1"
}
] | 2022-10-05 | [
[
"Chen",
"Che-Yu",
""
]
] | To date, a mathematically consistent construction of effective rotating black hole models in the context of Loop Quantum Gravity (LQG) is still lacking. In this work, we start with the assumption that rotating LQG black hole metrics can be effectively obtained using Newman-Janis Algorithm. Then, based on a few extra fa... |
1304.0675 | Nicola Tamanini | Nicola Tamanini | The Biconnection Variational Principle for General Relativity | Prepared for the proceedings of the 13th Marcel Grossmann Meeting | null | 10.1142/9789814623995_0313 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recently proposed variational approach for general relativity where, in
addition to the metric tensor, two independent affine connections enter the
action as dynamical variables, is revised. Field equations always reduce to the
Einstein field equations for any dependence of the matter action upon an
independent con... | [
{
"created": "Tue, 2 Apr 2013 15:58:46 GMT",
"version": "v1"
}
] | 2017-02-22 | [
[
"Tamanini",
"Nicola",
""
]
] | A recently proposed variational approach for general relativity where, in addition to the metric tensor, two independent affine connections enter the action as dynamical variables, is revised. Field equations always reduce to the Einstein field equations for any dependence of the matter action upon an independent conne... |
1802.04667 | Serge Repin Mr. | Serge V. Repin, Dmitry A. Kompaneets, Igor D. Novikov, Valeriya A.
Mityagina | Shadow of rotating black holes on a standard background screen | 6 pages, 7 figures | null | null | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the shape of the black hole shadow on the standard background
screen as it is registered by the distant observer. The screen is an infinite
plane, emitting the quanta uniformly distributed to a hemisphere. The source of
emission is considered to be optically thin and optically thick. It is shown
that the s... | [
{
"created": "Mon, 12 Feb 2018 13:23:50 GMT",
"version": "v1"
}
] | 2018-02-14 | [
[
"Repin",
"Serge V.",
""
],
[
"Kompaneets",
"Dmitry A.",
""
],
[
"Novikov",
"Igor D.",
""
],
[
"Mityagina",
"Valeriya A.",
""
]
] | We present the shape of the black hole shadow on the standard background screen as it is registered by the distant observer. The screen is an infinite plane, emitting the quanta uniformly distributed to a hemisphere. The source of emission is considered to be optically thin and optically thick. It is shown that the sha... |
1511.01105 | James Mertens | John T. Giblin Jr, James B. Mertens, Glenn D. Starkman | Departures from the FLRW Cosmological Model in an Inhomogeneous
Universe: A Numerical Examination | Updated to match published version | Phys. Rev. Lett. 116, 251301 (2016) | 10.1103/PhysRevLett.116.251301 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While the use of numerical general relativity for modeling astrophysical
phenomena and compact objects is commonplace, the application to cosmological
scenarios is only just beginning. Here, we examine the expansion of a spacetime
using the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formalism of numerical
relativity i... | [
{
"created": "Tue, 3 Nov 2015 21:00:26 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Nov 2015 20:24:05 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Jun 2016 14:22:36 GMT",
"version": "v3"
}
] | 2016-06-27 | [
[
"Giblin",
"John T.",
"Jr"
],
[
"Mertens",
"James B.",
""
],
[
"Starkman",
"Glenn D.",
""
]
] | While the use of numerical general relativity for modeling astrophysical phenomena and compact objects is commonplace, the application to cosmological scenarios is only just beginning. Here, we examine the expansion of a spacetime using the Baumgarte-Shapiro-Shibata-Nakamura (BSSN) formalism of numerical relativity in ... |
1907.13213 | Jorge Pullin | Rodolfo Gambini, Jorge Pullin, Aureliano Skirzewski | Covariance of the extended holonomy | 12 pages, RevTex, no figures | null | null | LSU-REL-073019 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been pointed out that the holonomy of generic extended loops is not
gauge covariant. We show how to define a family of extended loops for which
previous criticism does not apply. We also give sufficient conditions that
extended loops must satisfy in order to yield covariant holonomies. This makes
a quantum rep... | [
{
"created": "Tue, 30 Jul 2019 20:32:58 GMT",
"version": "v1"
}
] | 2019-08-01 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
],
[
"Skirzewski",
"Aureliano",
""
]
] | It has been pointed out that the holonomy of generic extended loops is not gauge covariant. We show how to define a family of extended loops for which previous criticism does not apply. We also give sufficient conditions that extended loops must satisfy in order to yield covariant holonomies. This makes a quantum repre... |
2309.03166 | Kirill Bronnikov | Kirill A. Bronnikov, Pavel E. Kashargin, Sergey V. Sushkov | Possible wormholes in a Friedmann universe | 21 pages, 10 figures | Universe 9, 465 (2023) | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of evolving wormholes able to exist in a closed
Friedmann dust-filled universe and described by a particular branch of the
well-known Lema{\i}tre-Tolman-Bondi solution to the Einstein equations and its
generalization with a nonzero cosmological constant and an electromagnetic
field. Most of th... | [
{
"created": "Wed, 6 Sep 2023 17:08:02 GMT",
"version": "v1"
}
] | 2023-11-14 | [
[
"Bronnikov",
"Kirill A.",
""
],
[
"Kashargin",
"Pavel E.",
""
],
[
"Sushkov",
"Sergey V.",
""
]
] | We study the properties of evolving wormholes able to exist in a closed Friedmann dust-filled universe and described by a particular branch of the well-known Lema{\i}tre-Tolman-Bondi solution to the Einstein equations and its generalization with a nonzero cosmological constant and an electromagnetic field. Most of the ... |
2006.11449 | Lionel London | Lionel London | Bi-orthogonal harmonics for the decomposition of gravitational radiation
I: angular modes, completeness, and the introduction of adjoint-spheroidal
harmonics | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The estimation of radiative modes is a central problem in gravitational wave
theory, with essential applications in signal modeling and data analysis. This
problem is complicated by most astrophysically relevant systems' not having
modes that are analytically tractable. A ubiquitous workaround is to use not
modes, bu... | [
{
"created": "Sat, 20 Jun 2020 00:48:04 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Dec 2020 03:37:19 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Jun 2022 12:41:56 GMT",
"version": "v3"
}
] | 2022-07-01 | [
[
"London",
"Lionel",
""
]
] | The estimation of radiative modes is a central problem in gravitational wave theory, with essential applications in signal modeling and data analysis. This problem is complicated by most astrophysically relevant systems' not having modes that are analytically tractable. A ubiquitous workaround is to use not modes, but ... |
0904.0099 | Prado Martin-Moruno | Prado Martin-Moruno and Pedro F. Gonzalez-Diaz | Lorentzian wormholes generalizes thermodynamics still further | Fast Track Communication Class. Quant. Grav., in press, 2009 | Class. Quant. Grav. 26 (2009) 215010 | 10.1088/0264-9381/26/21/215010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper deals with some thermodynamical aspects of Lorentzian wormholes,
including the formulation of the three main laws and the consideration of a
possible thermal emission made up of some sort of phantom radiation coming out
from the wormhole at a negative temperature. In order for these topics to be
consistent... | [
{
"created": "Wed, 1 Apr 2009 08:56:04 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Sep 2009 10:41:51 GMT",
"version": "v2"
}
] | 2012-12-06 | [
[
"Martin-Moruno",
"Prado",
""
],
[
"Gonzalez-Diaz",
"Pedro F.",
""
]
] | This paper deals with some thermodynamical aspects of Lorentzian wormholes, including the formulation of the three main laws and the consideration of a possible thermal emission made up of some sort of phantom radiation coming out from the wormhole at a negative temperature. In order for these topics to be consistently... |
1910.11675 | Subhajit Saha | Subhajit Saha | Viaggiu entropy and the generalized second law in a flat FLRW Universe | 7 pages; v2: Typos corrected, Matches published version | International Journal of Modern Physics A 34, 1950193 (2019) | 10.1142/S0217751X19501938 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our aim, in this paper, is to study the generalized second law by considering
the dynamical apparent horizon to be endowed with the Hawking temperature and
the Viaggiu entropy introduced in a pioneering work in 2014. We have devoted
our attention to a flat FLRW universe filled with a perfect fluid having a
constant e... | [
{
"created": "Tue, 22 Oct 2019 19:01:17 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Nov 2019 18:40:32 GMT",
"version": "v2"
}
] | 2019-11-13 | [
[
"Saha",
"Subhajit",
""
]
] | Our aim, in this paper, is to study the generalized second law by considering the dynamical apparent horizon to be endowed with the Hawking temperature and the Viaggiu entropy introduced in a pioneering work in 2014. We have devoted our attention to a flat FLRW universe filled with a perfect fluid having a constant equ... |
1805.01326 | Shanquan Lan | Shan-Quan Lan | Phase Transition of RN-AdS Black Hole with Fixed Electric Charge and
Topological Charge | 18 pages, 5 figures | Advances in High Energy Physics 2018,4350287 | 10.1155/2018/4350287 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Phase transition of RN-AdS black hole is investigated from a new perspective.
Not only the cosmological constant is treated as pressure, but also the spatial
curvature of black hole is treated as topological charge. We obtain the
extended thermodynamic first law from which the mass is naturally viewed as
enthalpy ins... | [
{
"created": "Thu, 3 May 2018 14:33:28 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Feb 2019 07:43:18 GMT",
"version": "v2"
}
] | 2019-02-28 | [
[
"Lan",
"Shan-Quan",
""
]
] | Phase transition of RN-AdS black hole is investigated from a new perspective. Not only the cosmological constant is treated as pressure, but also the spatial curvature of black hole is treated as topological charge. We obtain the extended thermodynamic first law from which the mass is naturally viewed as enthalpy inste... |
1204.2729 | Abhishek Majhi | Abhishek Majhi | Comment on `Black hole entropy and isolated horizon thermodynamics' | The author thinks that the novelty of the idea of `quantum hair' of
black holes proposed in this paper surpasses its weak points. Some
constructive works have been done by the author in other papers which are
based on or inspired by the concept of `quantum hair'. Hence, this comment is
needless to be on the arx... | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There is a deep underlying problem in the model dependent thermodynamic
analysis of black holes shown in the above quoted paper. In this method one can
only find out the canonical entropy of the black hole but not the
`microcanonical' entropy. Besides this crucial issue a few other problems are
also discussed.
| [
{
"created": "Thu, 12 Apr 2012 14:02:01 GMT",
"version": "v1"
},
{
"created": "Tue, 15 May 2012 19:48:44 GMT",
"version": "v2"
},
{
"created": "Mon, 4 Nov 2013 17:21:45 GMT",
"version": "v3"
}
] | 2013-11-05 | [
[
"Majhi",
"Abhishek",
""
]
] | There is a deep underlying problem in the model dependent thermodynamic analysis of black holes shown in the above quoted paper. In this method one can only find out the canonical entropy of the black hole but not the `microcanonical' entropy. Besides this crucial issue a few other problems are also discussed. |
2404.14981 | Mo Vali Mr | Tongyu Zhang and Moe Vali | Discontinuities in the Evolution of Properties of Kerr Black Holes in
the Extremal Limit | 2 figures, 9 pages. Literature review | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Ever since its discovery by Roy Kerr in 1963, the geometry around rotating,
electrostatically-neutral black holes, otherwise known as Kerr black holes, has
significantly contributed to theoretical developments in the fields of general
relativity, thermodynamics and beyond. Extremal Kerr black holes, in which the
spin... | [
{
"created": "Mon, 22 Apr 2024 08:07:00 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Apr 2024 09:14:03 GMT",
"version": "v2"
}
] | 2024-05-01 | [
[
"Zhang",
"Tongyu",
""
],
[
"Vali",
"Moe",
""
]
] | Ever since its discovery by Roy Kerr in 1963, the geometry around rotating, electrostatically-neutral black holes, otherwise known as Kerr black holes, has significantly contributed to theoretical developments in the fields of general relativity, thermodynamics and beyond. Extremal Kerr black holes, in which the spin p... |
1202.1438 | Elizabeth Winstanley | Ben L. Shepherd and Elizabeth Winstanley | Characterizing asymptotically anti-de Sitter black holes with abundant
stable gauge field hair | 33 pages, 13 figures, minor changes | null | 10.1088/0264-9381/29/15/155004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the light of the "no-hair" conjecture, we revisit stable black holes in
su(N) Einstein-Yang-Mills theory with a negative cosmological constant. These
black holes are endowed with copious amounts of gauge field hair, and we
address the question of whether these black holes can be uniquely characterized
by their mas... | [
{
"created": "Tue, 7 Feb 2012 14:42:41 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Jun 2012 11:28:19 GMT",
"version": "v2"
}
] | 2015-06-04 | [
[
"Shepherd",
"Ben L.",
""
],
[
"Winstanley",
"Elizabeth",
""
]
] | In the light of the "no-hair" conjecture, we revisit stable black holes in su(N) Einstein-Yang-Mills theory with a negative cosmological constant. These black holes are endowed with copious amounts of gauge field hair, and we address the question of whether these black holes can be uniquely characterized by their mass ... |
1812.03014 | Thomas Schucker | Christian Duval, Loic Marsot and Thomas Schucker | Gravitational birefringence of light in Schwarzschild spacetime | 17 pages, 3 figures; version 2 matches publication, 21 pages | Phys. Rev. D 99, 124037 (2019) | 10.1103/PhysRevD.99.124037 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the gravitational birefringence of light as it undergoes
gravitational lensing. To this end we re-derive the Souriau-Saturnini equations
in the Schwarzschild metric and solve them numerically and perturbatively. Our
main result is an offset between the trajectories of the photons of opposite
polarisations,... | [
{
"created": "Fri, 7 Dec 2018 13:06:25 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jul 2019 15:57:31 GMT",
"version": "v2"
}
] | 2019-07-05 | [
[
"Duval",
"Christian",
""
],
[
"Marsot",
"Loic",
""
],
[
"Schucker",
"Thomas",
""
]
] | We compute the gravitational birefringence of light as it undergoes gravitational lensing. To this end we re-derive the Souriau-Saturnini equations in the Schwarzschild metric and solve them numerically and perturbatively. Our main result is an offset between the trajectories of the photons of opposite polarisations, w... |
gr-qc/0407022 | Theodore A. Jacobson | Dieter Brill and Ted Jacobson | Spacetime and Euclidean Geometry | 11 pages, 9 figures; for a festschrift honoring Michael P. Ryan; v.2:
References to related work added | Gen.Rel.Grav. 38 (2006) 643-651 | 10.1007/s10714-006-0254-9 | null | gr-qc hep-th physics.ed-ph | null | Using only the principle of relativity and Euclidean geometry we show in this
pedagogical article that the square of proper time or length in a
two-dimensional spacetime diagram is proportional to the Euclidean area of the
corresponding causal domain. We use this relation to derive the Minkowski line
element by two g... | [
{
"created": "Tue, 6 Jul 2004 14:26:48 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Aug 2004 13:14:26 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Brill",
"Dieter",
""
],
[
"Jacobson",
"Ted",
""
]
] | Using only the principle of relativity and Euclidean geometry we show in this pedagogical article that the square of proper time or length in a two-dimensional spacetime diagram is proportional to the Euclidean area of the corresponding causal domain. We use this relation to derive the Minkowski line element by two geo... |
2204.04443 | Tapobroto Bhanja | Tapobroto Bhanja, Ameya Kolhatkar | Gravitational Collapse of Massless Vector Field with Positive
Cosmological Constant | 4 pages, 2 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigate the dynamics of homogeneous gravitational collapse of a
massless vector field in the presence of a positive cosmological constant
$\Lambda$. The corresponding density function $\rho (a)$ obtained for the
massless vector field is inversely proportional to the fourth power of the
scale factor $a (t)$. Th... | [
{
"created": "Sat, 9 Apr 2022 10:30:05 GMT",
"version": "v1"
}
] | 2022-04-12 | [
[
"Bhanja",
"Tapobroto",
""
],
[
"Kolhatkar",
"Ameya",
""
]
] | We investigate the dynamics of homogeneous gravitational collapse of a massless vector field in the presence of a positive cosmological constant $\Lambda$. The corresponding density function $\rho (a)$ obtained for the massless vector field is inversely proportional to the fourth power of the scale factor $a (t)$. The ... |
0908.0228 | Naoki Seto | Naoki Seto | Non-Gaussianity analysis of GW background made by short-duration burst
signals | 18 pages, to appear in PRD | Phys.Rev.D80:043003,2009 | 10.1103/PhysRevD.80.043003 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study an observational method to analyze non-Gaussianity of a
gravitational wave (GW) background made by superposition of weak burst signals.
The proposed method is based on fourth-order correlations of data from four
detectors, and might be useful to discriminate the origin of a GW background.
With a formulation ... | [
{
"created": "Mon, 3 Aug 2009 11:24:18 GMT",
"version": "v1"
}
] | 2009-09-02 | [
[
"Seto",
"Naoki",
""
]
] | We study an observational method to analyze non-Gaussianity of a gravitational wave (GW) background made by superposition of weak burst signals. The proposed method is based on fourth-order correlations of data from four detectors, and might be useful to discriminate the origin of a GW background. With a formulation ne... |
2211.03542 | Hoang Nguyen | Hoang Ky Nguyen | Beyond Schwarzschild-de Sitter spacetimes: II. An exact
non-Schwarzschild metric in pure $R^{2}$ gravity and new anomalous properties
of $R^{2}$ spacetimes | 23 pages, 13 figures | Phys. Rev. D 107, 104008 (2023) | 10.1103/PhysRevD.107.104008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In our recent publication (Phys. Rev. D 106, 104004 (2022)), we advanced a
program that Buchdahl originated but prematurely abandoned circa 1962 (Nuovo
Cimento 23, 141 (1962)). Therein we obtained an exhaustive class of metrics
that constitute the branch of non-trivial solutions to the pure $R^{2}$ field
equation in ... | [
{
"created": "Fri, 4 Nov 2022 13:47:04 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Apr 2023 17:48:24 GMT",
"version": "v2"
},
{
"created": "Wed, 3 May 2023 20:04:07 GMT",
"version": "v3"
}
] | 2023-05-05 | [
[
"Nguyen",
"Hoang Ky",
""
]
] | In our recent publication (Phys. Rev. D 106, 104004 (2022)), we advanced a program that Buchdahl originated but prematurely abandoned circa 1962 (Nuovo Cimento 23, 141 (1962)). Therein we obtained an exhaustive class of metrics that constitute the branch of non-trivial solutions to the pure $R^{2}$ field equation in va... |
1705.03058 | Muhammad Sharif | M. Sharif and Misbah Shahzadi | Particle Dynamics Near Kerr-MOG Black Hole | 22 pages, 6 figures, to appear in EPJC | Eur. Phys. J. C 77(2017)363 | 10.1140/epjc/s10052-017-4898-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper explores the dynamics of both neutral as well as charged particles
orbiting near a rotating black hole in scalar-tensor-vector gravity. We study
the conditions for the particle to escape at the innermost stable circular
orbit. We investigate stability of orbits through effective potential and
Lyapunov expo... | [
{
"created": "Mon, 8 May 2017 19:42:20 GMT",
"version": "v1"
}
] | 2017-09-13 | [
[
"Sharif",
"M.",
""
],
[
"Shahzadi",
"Misbah",
""
]
] | This paper explores the dynamics of both neutral as well as charged particles orbiting near a rotating black hole in scalar-tensor-vector gravity. We study the conditions for the particle to escape at the innermost stable circular orbit. We investigate stability of orbits through effective potential and Lyapunov expone... |
2009.01600 | Anna Nakonieczna | Anna Nakonieczna, {\L}ukasz Nakonieczny | Gravitational dynamics in the Higgs-dark matter sector toy model: the
field theoretic perspective | 38 pages, 21 figures | Eur. Phys. J. C (2020) 80:1051 | 10.1140/epjc/s10052-020-08643-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The objective of the paper was to examine gravitational evolutions in the
Higgs--dark matter sector toy model. The real part of the Higgs doublet was
modelled by a neutral scalar. Two dark matter candidates introduced were the
dark photon and a charged complex scalar. Non-minimal couplings of both scalars
to gravity ... | [
{
"created": "Thu, 3 Sep 2020 12:13:31 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Dec 2020 19:43:37 GMT",
"version": "v2"
}
] | 2020-12-18 | [
[
"Nakonieczna",
"Anna",
""
],
[
"Nakonieczny",
"Łukasz",
""
]
] | The objective of the paper was to examine gravitational evolutions in the Higgs--dark matter sector toy model. The real part of the Higgs doublet was modelled by a neutral scalar. Two dark matter candidates introduced were the dark photon and a charged complex scalar. Non-minimal couplings of both scalars to gravity we... |
1502.05093 | Alaric Doria | Alaric Doria and Gerardo Munoz | Acceleration without Horizons | 8 pages, 1 figure | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the metric of an accelerating observer moving with non-constant
proper acceleration in flat spacetime. With the exception of a limiting case
representing a Rindler observer, there are no horizons. In our solution,
observers can accelerate to any desired terminal speed $v_{\infty} < c$. The
motion of the acc... | [
{
"created": "Wed, 18 Feb 2015 00:47:53 GMT",
"version": "v1"
}
] | 2015-02-19 | [
[
"Doria",
"Alaric",
""
],
[
"Munoz",
"Gerardo",
""
]
] | We derive the metric of an accelerating observer moving with non-constant proper acceleration in flat spacetime. With the exception of a limiting case representing a Rindler observer, there are no horizons. In our solution, observers can accelerate to any desired terminal speed $v_{\infty} < c$. The motion of the accel... |
1907.12738 | Dipanjan Dey | Dipanjan Dey, Pankaj S. Joshi | Gravitational Collapse of Baryonic and Dark matter | 41 pages, 5 figures. Arab. J. Math. (2019) | null | 10.1007/s40065-019-0252-x | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A massive star undergoes a continual gravitational collapse when the
pressures inside the collapsing star become insufficient to balance the pull of
gravity. The Physics of gravitational collapse of stars is well studied. Using
general relativistic techniques one can show that the final fate of such a
catastrophic co... | [
{
"created": "Tue, 30 Jul 2019 05:05:56 GMT",
"version": "v1"
}
] | 2019-07-31 | [
[
"Dey",
"Dipanjan",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | A massive star undergoes a continual gravitational collapse when the pressures inside the collapsing star become insufficient to balance the pull of gravity. The Physics of gravitational collapse of stars is well studied. Using general relativistic techniques one can show that the final fate of such a catastrophic coll... |
1003.5950 | Gabriel Leon | Gabriel Leon and Daniel Sudarsky | The slow roll condition and the amplitude of the primordial spectrum of
cosmic fluctuations: Contrasts and similarities of standard account and the
"collapse scheme" | 22 pages, accepted for publication in Classical and Quantum Gravity | Class.Quant.Grav.27:225017, 2010 | 10.1088/0264-9381/27/22/225017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inflationary paradigm enjoys a very wide acceptance in the cosmological
community, due in large part to the fact that it is said to "naturally account"
for a nearly scale independent power primordial spectrum of fluctuations which
is in very good agreement with the observations. The expected overall scale of
the ... | [
{
"created": "Tue, 30 Mar 2010 23:54:40 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Oct 2010 19:57:42 GMT",
"version": "v2"
}
] | 2011-03-28 | [
[
"Leon",
"Gabriel",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | The inflationary paradigm enjoys a very wide acceptance in the cosmological community, due in large part to the fact that it is said to "naturally account" for a nearly scale independent power primordial spectrum of fluctuations which is in very good agreement with the observations. The expected overall scale of the fl... |
2102.01836 | Y. Jack Ng | Y. Jack Ng | Holographic Foam Cosmology: From the Late to the Early Universe | 10 pages, LaTeX. arXiv admin note: substantial text overlap with
arXiv:1910.00040 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum fluctuations endow spacetime with a foamy texture. The degree of
foaminess is dictated by blackhole physics to be of the holographic type.
Applied to cosmology, the holographic foam model predicts the existence of dark
energy with critical energy density in the current (late) universe, the quanta
of which obe... | [
{
"created": "Wed, 3 Feb 2021 01:54:26 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 2021 22:08:37 GMT",
"version": "v2"
}
] | 2021-02-10 | [
[
"Ng",
"Y. Jack",
""
]
] | Quantum fluctuations endow spacetime with a foamy texture. The degree of foaminess is dictated by blackhole physics to be of the holographic type. Applied to cosmology, the holographic foam model predicts the existence of dark energy with critical energy density in the current (late) universe, the quanta of which obey ... |
2404.10918 | William Leigh | William J. Leigh | Geometrisation of Fermions in Semi-Riemannian Spacetimes | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An earlier scheme [arXiv:2404.03360], where torsion plays an essential part
in a flat spacetime account of fermion spin, is extended to spacetimes with
non-zero Riemann curvature. It is found that further essential features of the
fermion, in particular its electromagnetic field, are determined by the
curvature and t... | [
{
"created": "Tue, 16 Apr 2024 21:34:42 GMT",
"version": "v1"
}
] | 2024-04-18 | [
[
"Leigh",
"William J.",
""
]
] | An earlier scheme [arXiv:2404.03360], where torsion plays an essential part in a flat spacetime account of fermion spin, is extended to spacetimes with non-zero Riemann curvature. It is found that further essential features of the fermion, in particular its electromagnetic field, are determined by the curvature and tor... |
gr-qc/0405019 | Ngangbam Ibohal | Ng Ibohal | On the variable-charged black holes in General Relativity: Hawking's
radiation and naked singularities | LaTex, P. 16 | Class.Quant.Grav. 19 (2002) 4327-4341 | 10.1088/0264-9381/19/16/308 | null | gr-qc | null | In this paper we study the Hawking radiation in Reissner-Nordstrom and
Kerr-Newman black holes by considering the charge to be the function of radial
coordinate.
| [
{
"created": "Wed, 5 May 2004 09:23:59 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Ibohal",
"Ng",
""
]
] | In this paper we study the Hawking radiation in Reissner-Nordstrom and Kerr-Newman black holes by considering the charge to be the function of radial coordinate. |
2404.06375 | Martin Bojowald | Martin Bojowald and Erick I. Duque | Emergent Modified Gravity | 21 pages, 2 figures | Class. Quantum Grav. 41 (2024) 095008 | 10.1088/1361-6382/ad36a8 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A complete canonical formulation of general covariance makes it possible to
construct new modified theories of gravity that are not of higher-curvature
form, as shown here in a spherically symmetric setting. The usual uniqueness
theorems are evaded by using a crucial and novel ingredient, allowing for
fundamental fie... | [
{
"created": "Tue, 9 Apr 2024 15:18:50 GMT",
"version": "v1"
}
] | 2024-04-10 | [
[
"Bojowald",
"Martin",
""
],
[
"Duque",
"Erick I.",
""
]
] | A complete canonical formulation of general covariance makes it possible to construct new modified theories of gravity that are not of higher-curvature form, as shown here in a spherically symmetric setting. The usual uniqueness theorems are evaded by using a crucial and novel ingredient, allowing for fundamental field... |
2307.13374 | Nils A. Nilsson | Quentin G. Bailey, Alexander S. Gard, Nils A. Nilsson, Rui Xu, Lijing
Shao | Classical radiation fields for scalar, electromagnetic, and
gravitational waves with spacetime-symmetry breaking | Clarifications and references added. Matches published version | Annals of Physics 461 (2024) 169582 | 10.1016/j.aop.2023.169582 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | An effective field theory framework is used to investigate some
Lorentz-violating effects on the generation of electromagnetic and
gravitational waves, complementing previous work on propagation. Specifically
we find solutions to a modified, anisotropic wave equation, sourced by charge
or fluid matter. We derive the ... | [
{
"created": "Tue, 25 Jul 2023 09:47:22 GMT",
"version": "v1"
},
{
"created": "Thu, 2 May 2024 01:26:34 GMT",
"version": "v2"
}
] | 2024-05-07 | [
[
"Bailey",
"Quentin G.",
""
],
[
"Gard",
"Alexander S.",
""
],
[
"Nilsson",
"Nils A.",
""
],
[
"Xu",
"Rui",
""
],
[
"Shao",
"Lijing",
""
]
] | An effective field theory framework is used to investigate some Lorentz-violating effects on the generation of electromagnetic and gravitational waves, complementing previous work on propagation. Specifically we find solutions to a modified, anisotropic wave equation, sourced by charge or fluid matter. We derive the ra... |
gr-qc/0601113 | Jose Luis Hernandez-Pastora | Jose Luis Hernandez Pastora | Approximate gravitational field of a rotating deformed mass | 16 pages. Latex. To appear in General Relativity and Gravitation | Gen.Rel.Grav. 38 (2006) 871-884 | 10.1007/s10714-006-0269-2 | null | gr-qc | null | A new approximate solution of vacuum and stationary Einstein field equations
is obtained. This solution is constructed by means of a power series expansion
of the Ernst potential in terms of two independent and dimensionless parameters
representing the quadrupole and the angular momentum respectively. The main
featur... | [
{
"created": "Thu, 26 Jan 2006 15:33:04 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Pastora",
"Jose Luis Hernandez",
""
]
] | A new approximate solution of vacuum and stationary Einstein field equations is obtained. This solution is constructed by means of a power series expansion of the Ernst potential in terms of two independent and dimensionless parameters representing the quadrupole and the angular momentum respectively. The main feature ... |
1402.6222 | Yan Wang | Yan Wang, Gerhard Heinzel, and Karsten Danzmann | First stage of LISA data processing: Clock synchronization and
arm-length determination via a hybrid-extended Kalman filter | 14 pages, Phys. Rev. D 90, 064016 (2014) | Phys. Rev. D 90, 064016 (2014) | 10.1103/PhysRevD.90.064016 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we describe a hybrid-extended Kalman filter algorithm to
synchronize the clocks and to precisely determine the inter-spacecraft
distances for space-based gravitational wave detectors, such as (e)LISA.
According to the simulation, the algorithm has significantly improved the
ranging accuracy and synchro... | [
{
"created": "Tue, 25 Feb 2014 16:07:00 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Sep 2014 19:30:19 GMT",
"version": "v2"
}
] | 2014-09-17 | [
[
"Wang",
"Yan",
""
],
[
"Heinzel",
"Gerhard",
""
],
[
"Danzmann",
"Karsten",
""
]
] | In this paper, we describe a hybrid-extended Kalman filter algorithm to synchronize the clocks and to precisely determine the inter-spacecraft distances for space-based gravitational wave detectors, such as (e)LISA. According to the simulation, the algorithm has significantly improved the ranging accuracy and synchroni... |
gr-qc/0703104 | David Lonie | G. S. Hall and D. P. Lonie | The principle of equivalence and projective structure in space-times | 23 pages, submitted to Classical and Quantum Gravity | Class.Quant.Grav.24:3617-3636,2007 | 10.1088/0264-9381/24/14/005 | null | gr-qc | null | This paper discusses the extent to which one can determine the space-time
metric from a knowledge of a certain subset of the (unparametrised) geodesics
of its Levi-Civita connection, that is, from the experimental evidence of the
equivalence principle. It is shown that, if the space-time concerned is known
to be vacu... | [
{
"created": "Wed, 21 Mar 2007 00:58:41 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hall",
"G. S.",
""
],
[
"Lonie",
"D. P.",
""
]
] | This paper discusses the extent to which one can determine the space-time metric from a knowledge of a certain subset of the (unparametrised) geodesics of its Levi-Civita connection, that is, from the experimental evidence of the equivalence principle. It is shown that, if the space-time concerned is known to be vacuum... |
2111.06869 | Carlos Bengaly Jr. | Carlos Bengaly | A null test of the Cosmological Principle with BAO measurements | 13 pages, 4 figures. Revised manuscript with extended analysis,
citations included, and fixed typos. Accepted for publication in Phys. Dark.
Univ. Code provided at https://github.com/astrobengaly/null_test_FLRW | null | 10.1016/j.dark.2022.100966 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The assumption of a Friedmann-Lema\^itre-Roberton-Walker (FLRW) Universe is
one of the fundamental pillars of modern Cosmology. It is crucial to confront
it against cosmological observations in order to confirm (or rule out) the
validity of the $\Lambda$CDM paradigm. We perform a consistency test of the
FLRW metric u... | [
{
"created": "Fri, 12 Nov 2021 18:47:13 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Dec 2021 21:53:10 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Jan 2022 17:46:44 GMT",
"version": "v3"
}
] | 2022-02-16 | [
[
"Bengaly",
"Carlos",
""
]
] | The assumption of a Friedmann-Lema\^itre-Roberton-Walker (FLRW) Universe is one of the fundamental pillars of modern Cosmology. It is crucial to confront it against cosmological observations in order to confirm (or rule out) the validity of the $\Lambda$CDM paradigm. We perform a consistency test of the FLRW metric usi... |
gr-qc/0511020 | Marc-Thierry Jaekel | Marc-Thierry Jaekel and Serge Reynaud | Gravity tests and the Pioneer anomaly | 10 pages | in "Laser, clocks and drag-free: exploration of relativistic
gravity in space", Eds. H. Dittus, C.Lammerzahl and S. Turyshev, (Springer,
Berlin 2006) 193 | null | LPTENS-05/35 | gr-qc | null | Experimental tests of gravity performed in the solar system show a good
agreement with general relativity. The latter is however challenged by the
Pioneer anomaly which might be pointing at some modification of gravity law at
ranges of the order of the size of the solar system. We introduce a metric
extension of gene... | [
{
"created": "Fri, 4 Nov 2005 16:53:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jaekel",
"Marc-Thierry",
""
],
[
"Reynaud",
"Serge",
""
]
] | Experimental tests of gravity performed in the solar system show a good agreement with general relativity. The latter is however challenged by the Pioneer anomaly which might be pointing at some modification of gravity law at ranges of the order of the size of the solar system. We introduce a metric extension of genera... |
2211.04654 | Rodrigo Andrade e Silva | Rodrigo Andrade e Silva | General theory of swimming in curved spacetime | 22 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Swimming in curved spacetime is a phenomenon in which free bodies in curved
spacetimes are able to propel themselves by performing cyclic internal motions.
Most surprisingly, it has been suggested that, in the limit of fast cycles, the
effective motion would not depend on the rapidity of the internal motions but
only... | [
{
"created": "Wed, 9 Nov 2022 03:04:13 GMT",
"version": "v1"
}
] | 2022-11-10 | [
[
"Silva",
"Rodrigo Andrade e",
""
]
] | Swimming in curved spacetime is a phenomenon in which free bodies in curved spacetimes are able to propel themselves by performing cyclic internal motions. Most surprisingly, it has been suggested that, in the limit of fast cycles, the effective motion would not depend on the rapidity of the internal motions but only o... |
2310.09602 | ChenWei Tong | Chen-Wei Tong, Bin-Hao Wang, Jia-Rui Sun | Topology of black hole thermodynamics via R\'enyi statistics | 24 pages,19 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the topological numbers of the four-dimensional
Schwarzschild black hole, $d$-dimensional Reissner-Nordstr\"om (RN) black hole,
$d$-dimensional singly rotating Kerr black hole and five-dimensional
Gauss-Bonnet black hole via the R\'enyi statistics. We find that the
topological number cal... | [
{
"created": "Sat, 14 Oct 2023 15:27:52 GMT",
"version": "v1"
}
] | 2023-10-18 | [
[
"Tong",
"Chen-Wei",
""
],
[
"Wang",
"Bin-Hao",
""
],
[
"Sun",
"Jia-Rui",
""
]
] | In this paper, we investigate the topological numbers of the four-dimensional Schwarzschild black hole, $d$-dimensional Reissner-Nordstr\"om (RN) black hole, $d$-dimensional singly rotating Kerr black hole and five-dimensional Gauss-Bonnet black hole via the R\'enyi statistics. We find that the topological number calcu... |
0805.1178 | Marco Valerio Battisti | Marco Valerio Battisti | Cosmological bounce from a deformed Heisenberg algebra | 10 pages; version improved, title changed, to appear in PRD | Phys. Rev. D 79 (2009) 083506 | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/3.0/ | The implications of a deformed Heisenberg algebra on the
Friedmann-Robertson-Walker cosmological models are investigated. We consider
the Snyder non-commutative space in which the translation group is undeformed
and the rotational invariance preserved. When this framework is implemented to
one-dimensional systems (wh... | [
{
"created": "Thu, 8 May 2008 14:59:39 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Apr 2009 09:15:39 GMT",
"version": "v2"
}
] | 2009-04-10 | [
[
"Battisti",
"Marco Valerio",
""
]
] | The implications of a deformed Heisenberg algebra on the Friedmann-Robertson-Walker cosmological models are investigated. We consider the Snyder non-commutative space in which the translation group is undeformed and the rotational invariance preserved. When this framework is implemented to one-dimensional systems (whic... |
2403.06922 | Alfredo D. Millano | Alfredo D. Millano, K. Dialektopoulos, N. Dimakis, A. Giacomini, H.
Shababi, Amlan Halder, A. Paliathanasis | Kantowski-Sachs and Bianchi III dynamics in $f\left(Q\right)$-gravity | 23 pages, 2 compound figures | null | null | null | gr-qc hep-ph math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the phase-space of homogeneous and anisotropic spacetimes within
symmetric teleparallel $f(Q)$-gravity. Specifically, we consider the
Kantowski-Sachs and locally rotational Bianchi III geometries to describe the
physical space. By analyzing the phase-space, we reconstruct the cosmological
history dictated ... | [
{
"created": "Mon, 11 Mar 2024 17:10:40 GMT",
"version": "v1"
}
] | 2024-03-12 | [
[
"Millano",
"Alfredo D.",
""
],
[
"Dialektopoulos",
"K.",
""
],
[
"Dimakis",
"N.",
""
],
[
"Giacomini",
"A.",
""
],
[
"Shababi",
"H.",
""
],
[
"Halder",
"Amlan",
""
],
[
"Paliathanasis",
"A.",
""
]
] | We explore the phase-space of homogeneous and anisotropic spacetimes within symmetric teleparallel $f(Q)$-gravity. Specifically, we consider the Kantowski-Sachs and locally rotational Bianchi III geometries to describe the physical space. By analyzing the phase-space, we reconstruct the cosmological history dictated by... |
2309.02931 | Mouhssine Koussour | N. Myrzakulov, M. Koussour, Alnadhief H. A. Alfedeel, and E. I. Hassan | Impact of dark energy on the equation of state in light of the latest
cosmological data | PTEP published version | Prog. Theor. Exp. Phys. 2023, 093E02 (2023) | 10.1093/ptep/ptad110 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconstruct the effective Equation of State (EoS) within the framework of
General Relativity (GR) theory in a homogeneous and isotropic FLRW Universe,
which is assumed to be composed of matter and Dark Energy (DE). Our analysis
employs a dataset consisting of 31 Cosmic Chronometer (CC) data points, six
data points... | [
{
"created": "Wed, 6 Sep 2023 11:45:44 GMT",
"version": "v1"
}
] | 2023-09-29 | [
[
"Myrzakulov",
"N.",
""
],
[
"Koussour",
"M.",
""
],
[
"Alfedeel",
"Alnadhief H. A.",
""
],
[
"Hassan",
"E. I.",
""
]
] | We reconstruct the effective Equation of State (EoS) within the framework of General Relativity (GR) theory in a homogeneous and isotropic FLRW Universe, which is assumed to be composed of matter and Dark Energy (DE). Our analysis employs a dataset consisting of 31 Cosmic Chronometer (CC) data points, six data points o... |
2110.15059 | Nicola Bellomo | Nicola Bellomo, Daniele Bertacca, Alexander C. Jenkins, Sabino
Matarrese, Alvise Raccanelli, Tania Regimbau, Angelo Ricciardone, Mairi
Sakellariadou | CLASS_GWB: robust modeling of the astrophysical gravitational wave
background anisotropies | 58 pages, 11 figures | null | 10.1088/1475-7516/2022/06/030 | KCL-PH-TH-2021-70 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational radiation offers a unique possibility to study the large-scale
structure of the Universe, gravitational wave sources and propagation in a
completely novel way. Given that gravitational wave maps contain a wealth of
astrophysical and cosmological information, interpreting this signal requires a
non-trivi... | [
{
"created": "Tue, 26 Oct 2021 18:04:11 GMT",
"version": "v1"
}
] | 2022-07-06 | [
[
"Bellomo",
"Nicola",
""
],
[
"Bertacca",
"Daniele",
""
],
[
"Jenkins",
"Alexander C.",
""
],
[
"Matarrese",
"Sabino",
""
],
[
"Raccanelli",
"Alvise",
""
],
[
"Regimbau",
"Tania",
""
],
[
"Ricciardone",
"Angelo"... | Gravitational radiation offers a unique possibility to study the large-scale structure of the Universe, gravitational wave sources and propagation in a completely novel way. Given that gravitational wave maps contain a wealth of astrophysical and cosmological information, interpreting this signal requires a non-trivial... |
2006.03450 | Yizhou Lu | Yizhou Lu, Arshad Ali, Yungui Gong, Jiong Lin and Fengge Zhang | Gauge transformation of scalar induced gravitational waves | 26 pages, 2 figures | Phys. Rev. D 102, 083503 (2020) | 10.1103/PhysRevD.102.083503 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gauge dependence of the scalar induced gravitational waves (SIGWs)
generated at the second order imposes a challenge to the discussion of the
secondary gravitational waves generated by scalar perturbations. We provide a
general formula that is valid in any gauge for the calculation of SIGWs and the
relationship f... | [
{
"created": "Fri, 5 Jun 2020 13:48:25 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Oct 2020 11:11:48 GMT",
"version": "v2"
}
] | 2020-12-15 | [
[
"Lu",
"Yizhou",
""
],
[
"Ali",
"Arshad",
""
],
[
"Gong",
"Yungui",
""
],
[
"Lin",
"Jiong",
""
],
[
"Zhang",
"Fengge",
""
]
] | The gauge dependence of the scalar induced gravitational waves (SIGWs) generated at the second order imposes a challenge to the discussion of the secondary gravitational waves generated by scalar perturbations. We provide a general formula that is valid in any gauge for the calculation of SIGWs and the relationship for... |
2306.08767 | Tousif Islam | Tousif Islam and Gaurav Khanna | Interplay between numerical relativity and perturbation theory : finite
size effects | 12 pages, 10 figures | Phys. Rev. D 108, 044012 (2023) | 10.1103/PhysRevD.108.044012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the interplay between numerical relativity (NR) and
point-particle black hole perturbation theory (ppBHPT) in the comparable mass
ratio regime. In the ppBHPT framework, the secondary black hole is treated as a
point particle, neglecting its finite size. Our study focuses on addressing the
missing finit... | [
{
"created": "Wed, 14 Jun 2023 22:32:41 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Aug 2023 14:44:04 GMT",
"version": "v2"
}
] | 2023-08-09 | [
[
"Islam",
"Tousif",
""
],
[
"Khanna",
"Gaurav",
""
]
] | We investigate the interplay between numerical relativity (NR) and point-particle black hole perturbation theory (ppBHPT) in the comparable mass ratio regime. In the ppBHPT framework, the secondary black hole is treated as a point particle, neglecting its finite size. Our study focuses on addressing the missing finite ... |
1312.2416 | Rong-Jia Yang | Rong-Jia Yang | Large-scale structure in superfluid Chaplygin gas cosmology | 10 pages, 6 figures, minor errors are corrected | Phys. Rev. D 89, 063014 (2014) | 10.1103/PhysRevD.89.063014 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the growth of large-scale structure in the superfluid
Chaplygin gas (SCG) model. Both linear and non-linear growth, such as
$\sigma_8$ and the skewness $S_3$, are discussed. We find the growth factor of
SCG reduces to the EdS case at early times while differs from the $\Lambda$CDM
case in the large $a$... | [
{
"created": "Mon, 9 Dec 2013 13:03:37 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Dec 2013 08:29:25 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Apr 2014 14:59:57 GMT",
"version": "v3"
}
] | 2014-04-08 | [
[
"Yang",
"Rong-Jia",
""
]
] | We investigate the growth of large-scale structure in the superfluid Chaplygin gas (SCG) model. Both linear and non-linear growth, such as $\sigma_8$ and the skewness $S_3$, are discussed. We find the growth factor of SCG reduces to the EdS case at early times while differs from the $\Lambda$CDM case in the large $a$ l... |
1803.06233 | Sarbari Guha Dr. | Sarbari Guha and Pinaki Bhattacharya | Five-dimensional warped product space-time with time-dependent warping
and a scalar field in the bulk | 12 pages, accepted for publication in Gravitation and Cosmology.
arXiv admin note: substantial text overlap with arXiv:1207.5716 | null | 10.1134/S0202289318030064 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have considered gravity in a five-dimensional warped product space-time,
with a time-dependent warp factor and a time-dependent extra dimension. The
five-dimensional field equations are derived for a spatially flat FRW brane and
the energy conditions and the nature of bulk geometry have been examined. It is
found ... | [
{
"created": "Wed, 14 Mar 2018 03:19:40 GMT",
"version": "v1"
}
] | 2018-09-05 | [
[
"Guha",
"Sarbari",
""
],
[
"Bhattacharya",
"Pinaki",
""
]
] | We have considered gravity in a five-dimensional warped product space-time, with a time-dependent warp factor and a time-dependent extra dimension. The five-dimensional field equations are derived for a spatially flat FRW brane and the energy conditions and the nature of bulk geometry have been examined. It is found th... |
1301.5264 | Celia Escamilla-Rivera | Celia Escamilla-Rivera, Maximo Banados and Pedro G. Ferreira | The rise of a tensor instability in Eddington-inspired gravity | 2 pages, to appear in the Proceedings of the 13th Marcel Grossman
Meeting (Stockholm, Sweden, July 1-7 2012), invited talk at the Parallel
Session AT4 "Modify Gravity" | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work an extension to Eddington's gravitational action is analyzed. We
consider the tensor perturbations of a FLRW space-time in the Eddington regime
in where the tensor mode is linearly unstable deep and the resulting
modifications to Einstein regime are quite strong.
| [
{
"created": "Tue, 22 Jan 2013 18:23:40 GMT",
"version": "v1"
}
] | 2013-01-23 | [
[
"Escamilla-Rivera",
"Celia",
""
],
[
"Banados",
"Maximo",
""
],
[
"Ferreira",
"Pedro G.",
""
]
] | In this work an extension to Eddington's gravitational action is analyzed. We consider the tensor perturbations of a FLRW space-time in the Eddington regime in where the tensor mode is linearly unstable deep and the resulting modifications to Einstein regime are quite strong. |
1304.0582 | Raissa Mendes | William C. C. Lima, Raissa F. P. Mendes, George E. A. Matsas and
Daniel A. T. Vanzella | Awaking the vacuum with spheroidal shells | 10 pages, 7 figures. Minor changes, version published on Phys. Rev. D | Phys. Rev. D 87, 104039 (2013) | 10.1103/PhysRevD.87.104039 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown that well-behaved spacetimes may induce the vacuum
fluctuations of some nonminimally coupled free scalar fields to go through a
phase of exponential growth. Here, we discuss this mechanism in the context of
spheroidal thin shells emphasizing the consequences of deviations from
spherical symmetry.
| [
{
"created": "Tue, 2 Apr 2013 10:27:20 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2013 16:57:16 GMT",
"version": "v2"
}
] | 2013-06-06 | [
[
"Lima",
"William C. C.",
""
],
[
"Mendes",
"Raissa F. P.",
""
],
[
"Matsas",
"George E. A.",
""
],
[
"Vanzella",
"Daniel A. T.",
""
]
] | It has been shown that well-behaved spacetimes may induce the vacuum fluctuations of some nonminimally coupled free scalar fields to go through a phase of exponential growth. Here, we discuss this mechanism in the context of spheroidal thin shells emphasizing the consequences of deviations from spherical symmetry. |
2206.05878 | Xiao-Mei Kuang | Xiao-Mei Kuang, Zi-Yu Tang, Bin Wang, Anzhong Wang | Constraining a modified gravity theory in strong gravitational lensing
and black hole shadow observations | 17 pages; published version | PHYS. REV. D 106, 064012 (2022) | 10.1103/PhysRevD.106.064012 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the strong gravitational lensing effect around rotating black holes
in different gravity theories. By calculating the deflection angle of strong
gravitational lensing, we evaluate the lensing observables including the image
position, separation, magnification and the time delays between the
relativistic imag... | [
{
"created": "Mon, 13 Jun 2022 02:12:23 GMT",
"version": "v1"
},
{
"created": "Sat, 17 Sep 2022 12:59:04 GMT",
"version": "v2"
}
] | 2022-09-20 | [
[
"Kuang",
"Xiao-Mei",
""
],
[
"Tang",
"Zi-Yu",
""
],
[
"Wang",
"Bin",
""
],
[
"Wang",
"Anzhong",
""
]
] | We study the strong gravitational lensing effect around rotating black holes in different gravity theories. By calculating the deflection angle of strong gravitational lensing, we evaluate the lensing observables including the image position, separation, magnification and the time delays between the relativistic images... |
2309.16638 | D. Divyajyoti | Divyajyoti, Sumit Kumar, Snehal Tibrewal, Isobel M. Romero-Shaw,
Chandra Kant Mishra | Blind spots and biases: the dangers of ignoring eccentricity in
gravitational-wave signals from binary black holes | 17 pages, 17 figures | Phys. Rev. D 109, 043037 - Published 21 February 2024 | 10.1103/PhysRevD.109.043037 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Most gravitational wave (GW) events observed by the LIGO and Virgo detectors
are consistent with mergers of binary black holes (BBHs) on quasi-circular
orbits. However, some events are also consistent with non-zero orbital
eccentricity, which can indicate that the binary formed via dynamical
interactions. Active GW s... | [
{
"created": "Thu, 28 Sep 2023 17:47:20 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Oct 2023 12:33:04 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Feb 2024 18:50:17 GMT",
"version": "v3"
}
] | 2024-02-23 | [
[
"Divyajyoti",
"",
""
],
[
"Kumar",
"Sumit",
""
],
[
"Tibrewal",
"Snehal",
""
],
[
"Romero-Shaw",
"Isobel M.",
""
],
[
"Mishra",
"Chandra Kant",
""
]
] | Most gravitational wave (GW) events observed by the LIGO and Virgo detectors are consistent with mergers of binary black holes (BBHs) on quasi-circular orbits. However, some events are also consistent with non-zero orbital eccentricity, which can indicate that the binary formed via dynamical interactions. Active GW sea... |
1906.02013 | Qasem Exirifard | Qasem Exirifard | Gravitomagnetism in Modified theory of Gravity | null | null | 10.1142/S0218271819501694 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gravitomagnetism in the Scalar-Vector-Tensor theory or Moffat's
Modified theory of Gravity(MOG). We compute the gravitomagnetic field that a
slow-moving mass distribution produces in its Newtonian regime. We report that
the consistency between the MOG gravitomagnetic field and that predicted by the
Einst... | [
{
"created": "Wed, 5 Jun 2019 13:08:18 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Jun 2019 15:05:39 GMT",
"version": "v2"
}
] | 2019-10-14 | [
[
"Exirifard",
"Qasem",
""
]
] | We study the gravitomagnetism in the Scalar-Vector-Tensor theory or Moffat's Modified theory of Gravity(MOG). We compute the gravitomagnetic field that a slow-moving mass distribution produces in its Newtonian regime. We report that the consistency between the MOG gravitomagnetic field and that predicted by the Einstei... |
1704.08502 | Francesco Cianfrani dr | Leonardo Agostini, Francesco Cianfrani, Giovanni Montani | Probabilistic interpretation of the wave function for the Bianchi I
model | 7 pages | Physical Review D 95, 126010 (2017) | 10.1103/PhysRevD.95.126010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare two different approaches for quantization of the Bianchi I model:
a reduced phase space quantization, in which the isotropic Misner variables is
taken as time, and the Vilenkin proposal, in which a semiclassical
approximation is performed for the same variable. We outline the technical and
interpretative i... | [
{
"created": "Thu, 27 Apr 2017 10:47:57 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2017 10:23:37 GMT",
"version": "v2"
}
] | 2017-08-02 | [
[
"Agostini",
"Leonardo",
""
],
[
"Cianfrani",
"Francesco",
""
],
[
"Montani",
"Giovanni",
""
]
] | We compare two different approaches for quantization of the Bianchi I model: a reduced phase space quantization, in which the isotropic Misner variables is taken as time, and the Vilenkin proposal, in which a semiclassical approximation is performed for the same variable. We outline the technical and interpretative iss... |
1207.7263 | Eyo Ita III | Chou Ching-Yi, Eyo Ita, Chopin Soo | Affine group representation formalism for four dimensional, Lorentzian,
quantum gravity | 13 pages. Revised version | Class. Quantum Grav. 30 (2013) 065013 | 10.1088/0264-9381/30/6/065013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the context of the Ashtekar variables, the Hamiltonian constraint of
four-dimensional pure General Relativity with cosmological constant, $\Lambda$,
is reexpressed as an affine algebra with the commutator of the imaginary part
of the Chern-Simons functional, $Q$, and the positive-definite volume element.
This ... | [
{
"created": "Mon, 30 Jul 2012 16:54:19 GMT",
"version": "v1"
},
{
"created": "Sun, 16 Sep 2012 14:09:41 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Jan 2013 14:56:29 GMT",
"version": "v3"
}
] | 2013-02-28 | [
[
"Ching-Yi",
"Chou",
""
],
[
"Ita",
"Eyo",
""
],
[
"Soo",
"Chopin",
""
]
] | Within the context of the Ashtekar variables, the Hamiltonian constraint of four-dimensional pure General Relativity with cosmological constant, $\Lambda$, is reexpressed as an affine algebra with the commutator of the imaginary part of the Chern-Simons functional, $Q$, and the positive-definite volume element. This de... |
gr-qc/9608028 | Hans-Juergen Schmidt | Hans - Juergen Schmidt | The Einstein equation should be divided by two | 9 pages, latex, no figures | Grav.Cosmol. 2 (1996) 250-252 | null | Gravitation and Cosmology in print | gr-qc | null | We present three reasons for rewriting the Einstein equation. The new version
is physically equivalent but geometrically more clear. 1. We write $4 \pi$
instead of $8 \pi$ at the r.h.s, and we explain how this factor enters as
surface area of the unit 2--sphere. 2. We define the Riemann curvature tensor
and its contr... | [
{
"created": "Sun, 11 Aug 1996 18:51:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schmidt",
"Hans - Juergen",
""
]
] | We present three reasons for rewriting the Einstein equation. The new version is physically equivalent but geometrically more clear. 1. We write $4 \pi$ instead of $8 \pi$ at the r.h.s, and we explain how this factor enters as surface area of the unit 2--sphere. 2. We define the Riemann curvature tensor and its contrac... |
2202.01207 | Gholam Hossein Bordbar | Gholam Hossein Bordbar and Mohammad Karami | Anisotropic magnetized neutron star | 8 pages, 8 figures, 3 tables | THE EUROPEAN PHYSICAL JOURNAL C 82, 74 (2022) | 10.1140/epjc/s10052-022-10038-0 | null | gr-qc nucl-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | As we know, the effect of strong magnetic field causes the anisotropy for the
magnetized compact objects. Therefore, in this paper, we have studied the
structure properties of anisotropic case of magnetized neutron star. We have
derived the equation of state (EoS) of neutron star matter for two forms of
magnetic fiel... | [
{
"created": "Mon, 31 Jan 2022 16:50:51 GMT",
"version": "v1"
}
] | 2022-02-04 | [
[
"Bordbar",
"Gholam Hossein",
""
],
[
"Karami",
"Mohammad",
""
]
] | As we know, the effect of strong magnetic field causes the anisotropy for the magnetized compact objects. Therefore, in this paper, we have studied the structure properties of anisotropic case of magnetized neutron star. We have derived the equation of state (EoS) of neutron star matter for two forms of magnetic fields... |
1106.3122 | Marcos Ramirez | Reinaldo J. Gleiser, Marcos A. Ramirez | The effect of radiative gravitational modes on the dynamics of a
cylindrical shell of counter rotating particles | null | Phys. Rev. D 85, 044026 (2012) | 10.1103/PhysRevD.85.044026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider some aspects of the relativistic dynamics of a
cylindrical shell of counter rotating particles. In some sense these are the
simplest systems with a physically acceptable matter content that display in a
well defined sense an interaction with the radiative modes of the gravitational
field. Th... | [
{
"created": "Thu, 16 Jun 2011 00:26:46 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Gleiser",
"Reinaldo J.",
""
],
[
"Ramirez",
"Marcos A.",
""
]
] | In this paper we consider some aspects of the relativistic dynamics of a cylindrical shell of counter rotating particles. In some sense these are the simplest systems with a physically acceptable matter content that display in a well defined sense an interaction with the radiative modes of the gravitational field. Thes... |
2005.10370 | Sachin Mohandas | S. Mohandas, R. J. van den Hoogen, D. Winters, M. Dala | Kantowski-Sachs Einstein-Aether Scalar Field Cosmological Models: The
Sequel | 24 pages, 8 figures, 3 tables, prepared for submission to JCAP | JCAP 08 (2020) 021 | 10.1088/1475-7516/2020/08/021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Utilizing the autonomous system of ordinary differential equations derived in
arXiv:1809.01458 to define the evolution, we further investigate a class of
cosmological models within an Einstein-aether gravitational framework by
introducing a non-trivial coupling between the shear of the aether field to the
scalar fiel... | [
{
"created": "Wed, 20 May 2020 21:50:51 GMT",
"version": "v1"
}
] | 2024-02-28 | [
[
"Mohandas",
"S.",
""
],
[
"Hoogen",
"R. J. van den",
""
],
[
"Winters",
"D.",
""
],
[
"Dala",
"M.",
""
]
] | Utilizing the autonomous system of ordinary differential equations derived in arXiv:1809.01458 to define the evolution, we further investigate a class of cosmological models within an Einstein-aether gravitational framework by introducing a non-trivial coupling between the shear of the aether field to the scalar field ... |
gr-qc/0306072 | Carlos F. Sopuerta | Carlos Barcelo, Cristiano Germani, Carlos F. Sopuerta (ICG, Portsmouth
U.) | On the thin-shell limit of branes in the presence of Gauss-Bonnet
interactions | 17 pages, 2 figures, RevTeX 4. Revised version accepted for
publication in Physical Review D | Phys.Rev. D68 (2003) 104007 | 10.1103/PhysRevD.68.104007 | null | gr-qc astro-ph hep-th | null | In this paper we study thick-shell braneworld models in the presence of a
Gauss-Bonnet term. We discuss the peculiarities of the attainment of the
thin-shell limit in this case and compare them with the same situation in
Einstein gravity. We describe the two simplest families of thick-brane models
(parametrized by th... | [
{
"created": "Mon, 16 Jun 2003 18:01:20 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Aug 2003 19:43:52 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Barcelo",
"Carlos",
"",
"ICG, Portsmouth\n U."
],
[
"Germani",
"Cristiano",
"",
"ICG, Portsmouth\n U."
],
[
"Sopuerta",
"Carlos F.",
"",
"ICG, Portsmouth\n U."
]
] | In this paper we study thick-shell braneworld models in the presence of a Gauss-Bonnet term. We discuss the peculiarities of the attainment of the thin-shell limit in this case and compare them with the same situation in Einstein gravity. We describe the two simplest families of thick-brane models (parametrized by the ... |
gr-qc/9606087 | Tsvi Piran | Shahar Hod and Tsvi Piran | Fine-Structure of Choptuik's Mass-Scaling Relation | 9 pages and 3 figures, submitted to Physical Review Letters Complete
PS file is available at ftp://shemesh.fiz.huji.ac.il or at
http://shemesh.fiz.huji.ac.il/papers/hp.uu Revised version included clearer
figures | Phys.Rev.D55:440-442,1997 | 10.1103/PhysRevD.55.440 | null | gr-qc | null | We conjecture (analytically) and demonstrate (numerically) the existence of a
fine-structure above the power-law behavior of the mass of black-holes that
form in gravitational collapse of spherical massless scalar field. The
fine-structure is a periodic function of the critical-separation $(p-p^*)$. We
predict that t... | [
{
"created": "Sat, 29 Jun 1996 11:28:44 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jul 1996 14:04:38 GMT",
"version": "v2"
}
] | 2009-12-30 | [
[
"Hod",
"Shahar",
""
],
[
"Piran",
"Tsvi",
""
]
] | We conjecture (analytically) and demonstrate (numerically) the existence of a fine-structure above the power-law behavior of the mass of black-holes that form in gravitational collapse of spherical massless scalar field. The fine-structure is a periodic function of the critical-separation $(p-p^*)$. We predict that the... |
1208.6312 | Jie Liu | Jie Liu, Yun-Song Piao | Parameterization and Reconstruction of Quasi Static Universe | minor changes and Refs. added, publish in EPJC | null | 10.1140/epjc/s10052-013-2460-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a possibility of the fate of universe, in which there is neither the
rip singularity, which results in the disintegration of bound systems, nor the
endless expansion, instead the universe will be quasi static. We discuss the
parameterization of the corresponding evolution and the reconstruction of the
scalar... | [
{
"created": "Thu, 30 Aug 2012 20:56:30 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2012 03:43:33 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Jun 2013 09:00:49 GMT",
"version": "v3"
}
] | 2015-06-11 | [
[
"Liu",
"Jie",
""
],
[
"Piao",
"Yun-Song",
""
]
] | We study a possibility of the fate of universe, in which there is neither the rip singularity, which results in the disintegration of bound systems, nor the endless expansion, instead the universe will be quasi static. We discuss the parameterization of the corresponding evolution and the reconstruction of the scalar f... |
2004.10778 | Vasilis Oikonomou | V.K. Oikonomou | Rectifying an Inconsistency in $F(R)$ Gravity Inflation | EPL Accepted | null | 10.1209/0295-5075/130/10006 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we shall provide a formal derivation of the inflationary
slow-roll indices for $F(R)$ gravity from the power spectrum without the
condition $\dot{\epsilon}_1=0$, frequently used in the literature, where
$\epsilon_1=-\frac{\dot{H}}{H^2}$ is the first slow-roll index. We shall employ
Karamata's theorem f... | [
{
"created": "Wed, 22 Apr 2020 18:26:49 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Oikonomou",
"V. K.",
""
]
] | In this letter we shall provide a formal derivation of the inflationary slow-roll indices for $F(R)$ gravity from the power spectrum without the condition $\dot{\epsilon}_1=0$, frequently used in the literature, where $\epsilon_1=-\frac{\dot{H}}{H^2}$ is the first slow-roll index. We shall employ Karamata's theorem for... |
1410.4134 | Ozgur Delice | Ahmet Baykal, \"Ozg\"ur Delice | Generalized Sparling-Thirring form in the Brans-Dicke theory | Revtex 4.1, 20 pages | null | 10.1140/epjc/s10052-015-3300-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The definition of the Sparling-Thirring form is extended to the Brans-Dicke
theory. By writing the Brans-Dicke field equations in a formally Maxwell-like
form, a superpotential and a corresponding pseudo energy-momentum form are
defined. The general energy expression provided by the superpotential in the
Jordan frame... | [
{
"created": "Wed, 15 Oct 2014 16:57:21 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Baykal",
"Ahmet",
""
],
[
"Delice",
"Özgür",
""
]
] | The definition of the Sparling-Thirring form is extended to the Brans-Dicke theory. By writing the Brans-Dicke field equations in a formally Maxwell-like form, a superpotential and a corresponding pseudo energy-momentum form are defined. The general energy expression provided by the superpotential in the Jordan frame i... |
2308.10786 | Gines R. Perez Teruel | GRP Teruel, Ksh. Newton Singh, Tanmoy Chowdhury, Farook Rahaman,
Monimala Mondal | Testing of K(R,T)-gravity through gravastar configurations | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this article, we are reporting for the first time the existence of
gravastar configurations in the framework of K(R,T)-gravity, which can be
treated as an alternative to a black hole (Mazur and Mottola). This strengthens
how much this new gravity theory may be physically demanding to the gravity
community in the n... | [
{
"created": "Mon, 21 Aug 2023 15:21:22 GMT",
"version": "v1"
}
] | 2023-08-22 | [
[
"Teruel",
"GRP",
""
],
[
"Singh",
"Ksh. Newton",
""
],
[
"Chowdhury",
"Tanmoy",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Mondal",
"Monimala",
""
]
] | In this article, we are reporting for the first time the existence of gravastar configurations in the framework of K(R,T)-gravity, which can be treated as an alternative to a black hole (Mazur and Mottola). This strengthens how much this new gravity theory may be physically demanding to the gravity community in the nea... |
2206.05012 | Wei-Liang Qian | Yunqi Liu and Cheng-Yong Zhang and Wei-Liang Qian and Kai Lin and Bin
Wang | Dynamic generation or removal of a scalar hair | 25 pages, 12 figures | null | 10.1007/JHEP01(2023)074 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study dynamic processes through which the scalar hair of black holes is
generated or detached in a theory with a scalar field non-minimally coupled to
Gauss-Bonnet and Ricci scalar invariants. We concentrate on the nonlinear
temporal evolution of a far-from-equilibrium gravitational system. In our
simulations, we ... | [
{
"created": "Fri, 10 Jun 2022 11:55:22 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jun 2022 12:52:51 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Jun 2022 12:28:42 GMT",
"version": "v3"
},
{
"created": "Sat, 30 Jul 2022 01:48:23 GMT",
"version": "v4"
},
{
"c... | 2023-02-01 | [
[
"Liu",
"Yunqi",
""
],
[
"Zhang",
"Cheng-Yong",
""
],
[
"Qian",
"Wei-Liang",
""
],
[
"Lin",
"Kai",
""
],
[
"Wang",
"Bin",
""
]
] | We study dynamic processes through which the scalar hair of black holes is generated or detached in a theory with a scalar field non-minimally coupled to Gauss-Bonnet and Ricci scalar invariants. We concentrate on the nonlinear temporal evolution of a far-from-equilibrium gravitational system. In our simulations, we ch... |
1305.7289 | Andrzej Banburski | Andrzej Banburski | Twisting loops and global momentum non-conservation in Relative Locality | 6 pages, 2 figures, updated reference, matches version published in
PRD | Phys. Rev. D 88, 076012 (2013) | 10.1103/PhysRevD.88.076012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent work in Relative Locality has shown that the theory allows for a
solution of an on-shell causal loop. We show that the theory contains a
different type of a loop in which locally momenta are conserved, but there is
no global momentum conservation. Thus a freely propagating particle can decay
into two particles... | [
{
"created": "Fri, 31 May 2013 02:52:49 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Oct 2013 18:11:46 GMT",
"version": "v2"
}
] | 2013-10-22 | [
[
"Banburski",
"Andrzej",
""
]
] | Recent work in Relative Locality has shown that the theory allows for a solution of an on-shell causal loop. We show that the theory contains a different type of a loop in which locally momenta are conserved, but there is no global momentum conservation. Thus a freely propagating particle can decay into two particles, ... |
1709.06581 | Joao G. Rosa | Joao G. Rosa and Thomas W. Kephart | Stimulated axion decay in superradiant clouds around primordial black
holes | 7 pages, 2 figures; modified title and added discussion to match
version published in Physical Review Letters (Editors' Suggestion) | Phys. Rev. Lett. 120, 231102 (2018) | 10.1103/PhysRevLett.120.231102 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The superradiant instability can lead to the generation of extremely dense
axion clouds around rotating black holes. We show that, despite the long
lifetime of the QCD axion with respect to spontaneous decay into photon pairs,
stimulated decay becomes significant above a minimum axion density and leads to
extremely b... | [
{
"created": "Tue, 19 Sep 2017 18:00:26 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jun 2018 10:52:37 GMT",
"version": "v2"
}
] | 2018-06-13 | [
[
"Rosa",
"Joao G.",
""
],
[
"Kephart",
"Thomas W.",
""
]
] | The superradiant instability can lead to the generation of extremely dense axion clouds around rotating black holes. We show that, despite the long lifetime of the QCD axion with respect to spontaneous decay into photon pairs, stimulated decay becomes significant above a minimum axion density and leads to extremely bri... |
2109.09399 | Kalin Staykov Dr. | Kalin V. Staykov, Radostina Z. Zheleva | Scalarized non-topological neutron stars in multi-scalar Gauss-Bonnet
gravity | 9 pages, 4 figures | null | 10.1140/epjc/s10052-022-10046-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we construct novel non-topological, spontaneously
scalarized neutron stars in multi-scalar Gauss-Bonnet gravity with maximally
symmetric target space, and nontrivial map $\varphi:spacetime \rightarrow
target\ space$. The theory is characterized by the fact that for some classes
of coupling functi... | [
{
"created": "Mon, 20 Sep 2021 09:56:35 GMT",
"version": "v1"
}
] | 2022-02-23 | [
[
"Staykov",
"Kalin V.",
""
],
[
"Zheleva",
"Radostina Z.",
""
]
] | In the present paper we construct novel non-topological, spontaneously scalarized neutron stars in multi-scalar Gauss-Bonnet gravity with maximally symmetric target space, and nontrivial map $\varphi:spacetime \rightarrow target\ space$. The theory is characterized by the fact that for some classes of coupling function... |
2302.03666 | Yurii Ignat'ev | Yu. G. Ignat'ev | Gravitational-Scalar Instability of a Cosmological Model Based on a
Two-Component System of Degenerate Scalarly Charged Fermions with Asymmetric
Higgs Interaction. I. Equations for Perturbations | 11 pages, 15 references | Russ.Phys.J. 65 (2023) 1490-1502 | 10.1007/s11182-023-02795-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A mathematical model is formulated for the evolution of plane perturbations
in a cosmological two-component statistical system of completely degenerate
scalarly charged fermions with an asymmetric scalar Higgs interaction. A
complete closed system of differential equations describing the unperturbed
state of a homoge... | [
{
"created": "Thu, 2 Feb 2023 09:15:01 GMT",
"version": "v1"
}
] | 2023-02-08 | [
[
"Ignat'ev",
"Yu. G.",
""
]
] | A mathematical model is formulated for the evolution of plane perturbations in a cosmological two-component statistical system of completely degenerate scalarly charged fermions with an asymmetric scalar Higgs interaction. A complete closed system of differential equations describing the unperturbed state of a homogene... |
gr-qc/0405009 | Elias Zafiris | Elias Zafiris | Quantum Observables Algebras and Abstract Differential Geometry: The
Topos-Theoretic Dynamics of Diagrams of Commutative Algebraic Localizations | 81 pages, replaced by expanded published version | Int.J.Theor.Phys.46:237-243,2007 | 10.1007/s10773-006-9231-z | null | gr-qc | null | We construct a sheaf-theoretic representation of quantum observables algebras
over a base category equipped with a Grothendieck topology, consisting of
epimorphic families of commutative observables algebras, playing the role of
local arithmetics in measurement situations. This construction makes possible
the adaptat... | [
{
"created": "Sun, 2 May 2004 17:20:37 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Mar 2007 10:20:00 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Zafiris",
"Elias",
""
]
] | We construct a sheaf-theoretic representation of quantum observables algebras over a base category equipped with a Grothendieck topology, consisting of epimorphic families of commutative observables algebras, playing the role of local arithmetics in measurement situations. This construction makes possible the adaptatio... |
2212.05531 | Tanmoy Paul | Sergei D. Odintsov and Tanmoy Paul | A non-singular generalized entropy and its implications on bounce
cosmology | "Physics of the Dark Universe" accepted | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new five-parameter entropy function that proves to be
singular-free during the entire cosmic evolution of the universe, and at the
same time, also generalizes the Tsallis, Barrow, R\'{e}nyi, Sharma-Mittal,
Kaniadakis and Loop Quantum Gravity entropies for suitable limits of the
parameters. In particular,... | [
{
"created": "Sun, 11 Dec 2022 16:03:23 GMT",
"version": "v1"
}
] | 2022-12-13 | [
[
"Odintsov",
"Sergei D.",
""
],
[
"Paul",
"Tanmoy",
""
]
] | We propose a new five-parameter entropy function that proves to be singular-free during the entire cosmic evolution of the universe, and at the same time, also generalizes the Tsallis, Barrow, R\'{e}nyi, Sharma-Mittal, Kaniadakis and Loop Quantum Gravity entropies for suitable limits of the parameters. In particular, a... |
1001.0178 | Sergio Dain | Sergio Dain and Mar\'ia E. Gabach Cl\'ement | Small deformations of extreme Kerr black hole initial data | 26 pages, 4 figures | Class.Quant.Grav.28:075003,2011 | 10.1088/0264-9381/28/7/075003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the existence of a family of initial data for Einstein equations
which represent small deformations of the extreme Kerr black hole initial data.
The data in this family have the same asymptotic geometry as extreme Kerr. In
particular, the deformations preserve the angular momentum and the area of the
cylindr... | [
{
"created": "Thu, 31 Dec 2009 20:51:13 GMT",
"version": "v1"
}
] | 2011-03-03 | [
[
"Dain",
"Sergio",
""
],
[
"Clément",
"María E. Gabach",
""
]
] | We prove the existence of a family of initial data for Einstein equations which represent small deformations of the extreme Kerr black hole initial data. The data in this family have the same asymptotic geometry as extreme Kerr. In particular, the deformations preserve the angular momentum and the area of the cylindric... |
gr-qc/9805103 | Helio V. Fagundes | Helio V. Fagundes | Addendum to Paper "Closed Spaces in Cosmology" | 3 pages, no figure | null | null | null | gr-qc astro-ph hep-th | null | A few corrections and comments are made upon a previously published paper by
the author (Gen. Rel. Gravit. 24, 199 (1992)), on the subject of cosmological
models with compact spatial sections.
| [
{
"created": "Fri, 29 May 1998 16:22:54 GMT",
"version": "v1"
},
{
"created": "Sun, 31 May 1998 15:40:00 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Fagundes",
"Helio V.",
""
]
] | A few corrections and comments are made upon a previously published paper by the author (Gen. Rel. Gravit. 24, 199 (1992)), on the subject of cosmological models with compact spatial sections. |
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