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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1111.4784 | Aur\'elien Hees | A. Hees, A. F\"uzfa | Combined cosmological and solar system constraints on chameleon
mechanism | revised version, minor changes | Phys. Rev. D, 85, 103005, 2012 | 10.1103/PhysRevD.85.103005 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Chameleon mechanism appearing in massive tensor-scalar theory of gravity can
effectively reduce locally the non-minimal coupling between the scalar field
and matter. This mechanism is invoked to reconcile large-scale departures from
general relativity (GR), supposedly accounting for cosmic acceleration, to
small scal... | [
{
"created": "Mon, 21 Nov 2011 08:24:43 GMT",
"version": "v1"
},
{
"created": "Thu, 10 May 2012 21:31:13 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Hees",
"A.",
""
],
[
"Füzfa",
"A.",
""
]
] | Chameleon mechanism appearing in massive tensor-scalar theory of gravity can effectively reduce locally the non-minimal coupling between the scalar field and matter. This mechanism is invoked to reconcile large-scale departures from general relativity (GR), supposedly accounting for cosmic acceleration, to small scales... |
1403.2600 | Tomasz Miller | M. Heller, T. Miller, L. Pysiak, W. Sasin | Geometry and General Relativity in the Groupoid Model with a Finite
Structure Group | 32 pages | Can. J Phys., 2015, 93(1): 43-54 | 10.1139/cjp-2014-0145 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a series of papers we proposed a model unifying general relativity and
quantum mechanics. The idea was to deduce both general relativity and quantum
mechanics from a noncommutative algebra ${\cal A}_{\Gamma}$ defined on a
transformation groupoid $\Gamma$ determined by the action of the Lorentz group
on the frame b... | [
{
"created": "Tue, 11 Mar 2014 15:04:12 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jan 2015 13:26:42 GMT",
"version": "v2"
}
] | 2015-01-09 | [
[
"Heller",
"M.",
""
],
[
"Miller",
"T.",
""
],
[
"Pysiak",
"L.",
""
],
[
"Sasin",
"W.",
""
]
] | In a series of papers we proposed a model unifying general relativity and quantum mechanics. The idea was to deduce both general relativity and quantum mechanics from a noncommutative algebra ${\cal A}_{\Gamma}$ defined on a transformation groupoid $\Gamma$ determined by the action of the Lorentz group on the frame bun... |
gr-qc/0305028 | Sawa Manoff | Sawa Manoff | Null vector fields in spaces with affine connections and metrics.
Doppler's effect, Hubble's effect, and aberration's effect | 33 pages, LaTeX | null | null | null | gr-qc | null | The notion of null (isotropic) vector field is considered in spaces with
affine connections and metrics as models of space or space-time. On its basis
the propagation of signals in space-time is considered. The Doppler effect is
generalized for these types of spaces. The notions of standard (longitudinal)
Doppler eff... | [
{
"created": "Wed, 7 May 2003 15:54:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Manoff",
"Sawa",
""
]
] | The notion of null (isotropic) vector field is considered in spaces with affine connections and metrics as models of space or space-time. On its basis the propagation of signals in space-time is considered. The Doppler effect is generalized for these types of spaces. The notions of standard (longitudinal) Doppler effec... |
1204.2965 | Mauro Sereno | N. Radicella (UAB), M. Sereno (POLITO, INFN), A. Tartaglia (POLITO,
INFN) | Spherical symmetry in a dark energy permeated space-time | 14 pages, 1 figure, in press on Classical and Quantum Gravity | null | 10.1088/0264-9381/29/11/115003 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The properties of a spherically symmetric static space-time permeated of dark
energy are worked out. Dark energy is viewed as the strain energy of an
elastically deformable four dimensional manifold. The metric is worked out in
the vacuum region around a central spherical mass/defect in the linear
approximation. We d... | [
{
"created": "Fri, 13 Apr 2012 12:07:58 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Radicella",
"N.",
"",
"UAB"
],
[
"Sereno",
"M.",
"",
"POLITO, INFN"
],
[
"Tartaglia",
"A.",
"",
"POLITO,\n INFN"
]
] | The properties of a spherically symmetric static space-time permeated of dark energy are worked out. Dark energy is viewed as the strain energy of an elastically deformable four dimensional manifold. The metric is worked out in the vacuum region around a central spherical mass/defect in the linear approximation. We dis... |
1005.2328 | Ivan Agullo | Ivan Agullo, Jose Navarro-Salas, Gonzalo J. Olmo, Leonard Parker | Reply to "Comment on 'Insensitivity of Hawking radiation to an invariant
Planck-scale cutoff' " | 3 pages, to appear in Phys. Rev. D. | Phys.Rev.D81:108502,2010 | 10.1103/PhysRevD.81.108502 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We clarify the relationship between the conclusions of the previous Comment
of A. Helfer [1] and that of our Brief Report [arXiv:0906.5315]
| [
{
"created": "Thu, 13 May 2010 14:25:05 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Agullo",
"Ivan",
""
],
[
"Navarro-Salas",
"Jose",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Parker",
"Leonard",
""
]
] | We clarify the relationship between the conclusions of the previous Comment of A. Helfer [1] and that of our Brief Report [arXiv:0906.5315] |
1110.5950 | Leo Stein | Kent Yagi, Leo C. Stein, Nicolas Yunes, Takahiro Tanaka | Post-Newtonian, Quasi-Circular Binary Inspirals in Quadratic Modified
Gravity | 26 pages, 3 figures, 2 tables (matches version published in PRD); v3
prepended an erratum | Phys. Rev. D 85, 064022 (2012); Phys. Rev. D 93, 029902 (2016) | 10.1103/PhysRevD.85.064022 10.1103/PhysRevD.93.029902 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a general class of quantum gravity-inspired, modified gravity
theories, where the Einstein-Hilbert action is extended through the addition of
all terms quadratic in the curvature tensor coupled to scalar fields with
standard kinetic energy. This class of theories includes
Einstein-Dilaton-Gauss-Bonnet and... | [
{
"created": "Thu, 27 Oct 2011 00:13:28 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Apr 2012 02:31:15 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Dec 2015 22:27:57 GMT",
"version": "v3"
}
] | 2016-04-12 | [
[
"Yagi",
"Kent",
""
],
[
"Stein",
"Leo C.",
""
],
[
"Yunes",
"Nicolas",
""
],
[
"Tanaka",
"Takahiro",
""
]
] | We consider a general class of quantum gravity-inspired, modified gravity theories, where the Einstein-Hilbert action is extended through the addition of all terms quadratic in the curvature tensor coupled to scalar fields with standard kinetic energy. This class of theories includes Einstein-Dilaton-Gauss-Bonnet and C... |
2402.07213 | Hichem Guergouri | Omar Nemoul, Hichem Guergouri, Jamal Mimouni | Non-Radial Free Geodesics. II. In Spatially Curved FLRW Spacetime | 17 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper presents an in-depth exploration of timelike free geodesics in
spatially curved Friedmann-Lema\^itre-Robertson-Walker (FLRW) spacetime. A
unified approach for these geodesics encompassing both radial and non-radial
trajectories across Euclidean, spherical, and hyperbolic geometries is
employed. Using the s... | [
{
"created": "Sun, 11 Feb 2024 14:21:22 GMT",
"version": "v1"
}
] | 2024-02-13 | [
[
"Nemoul",
"Omar",
""
],
[
"Guergouri",
"Hichem",
""
],
[
"Mimouni",
"Jamal",
""
]
] | This paper presents an in-depth exploration of timelike free geodesics in spatially curved Friedmann-Lema\^itre-Robertson-Walker (FLRW) spacetime. A unified approach for these geodesics encompassing both radial and non-radial trajectories across Euclidean, spherical, and hyperbolic geometries is employed. Using the sym... |
1808.04674 | Vasilis Oikonomou | K. Kleidis, V.K. Oikonomou | Autonomous Dynamical System Description of de Sitter Evolution in Scalar
Assisted $f(R)-\phi$ Gravity | null | null | 10.1142/S0219887818502122 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this letter we will study the cosmological dynamical system of an $f(R)$
gravity in the presence of a canonical scalar field $\phi$ with an exponential
potential, by constructing the dynamical system in a way that it is render
autonomous. This feature is controlled by a single variable $m$, which when it
is consta... | [
{
"created": "Tue, 14 Aug 2018 13:23:56 GMT",
"version": "v1"
}
] | 2019-01-09 | [
[
"Kleidis",
"K.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | In this letter we will study the cosmological dynamical system of an $f(R)$ gravity in the presence of a canonical scalar field $\phi$ with an exponential potential, by constructing the dynamical system in a way that it is render autonomous. This feature is controlled by a single variable $m$, which when it is constant... |
0801.4342 | Sushant Ghosh | S. G. Ghosh and A. K. Dawood | Radiating black hole solutions in arbitrary dimensions | RevTeX 9 pages, no figures | Gen.Rel.Grav.40:9-21,2008 | 10.1007/s10714-007-0511-6 | null | gr-qc | null | We prove a theorem that characterizes a large family of non-static solutions
to Einstein equations in $N$-dimensional space-time, representing, in general,
spherically symmetric Type II fluid. It is shown that the best known
Vaidya-based (radiating) black hole solutions to Einstein equations, in both
four dimensions ... | [
{
"created": "Mon, 28 Jan 2008 17:59:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ghosh",
"S. G.",
""
],
[
"Dawood",
"A. K.",
""
]
] | We prove a theorem that characterizes a large family of non-static solutions to Einstein equations in $N$-dimensional space-time, representing, in general, spherically symmetric Type II fluid. It is shown that the best known Vaidya-based (radiating) black hole solutions to Einstein equations, in both four dimensions (4... |
1111.0912 | John Morris | J. R. Morris | Dilatonic effects near naked singularities | 13 pages | null | 10.1007/s10714-011-1282-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Static spherically symmetric solutions of 4d Brans-Dicke theory include a set
of naked singularity solutions. Dilatonic effects near the naked singularities
result in either a shielding or an antishielding effect from intruding massive
test particles. One result is that for a portion of the solution parameter
space, ... | [
{
"created": "Thu, 3 Nov 2011 16:53:31 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Morris",
"J. R.",
""
]
] | Static spherically symmetric solutions of 4d Brans-Dicke theory include a set of naked singularity solutions. Dilatonic effects near the naked singularities result in either a shielding or an antishielding effect from intruding massive test particles. One result is that for a portion of the solution parameter space, no... |
gr-qc/0405079 | Carlos Augusto Romero Filho | J.J.Figueiredo and C.Romero | Kaluza-Klein gravity in the context of modern embedding theories of
spacetime | 12 pages - Typeset using REVTEX | Grav.Cosmol.10:187-190,2004 | null | null | gr-qc | null | We review and discuss the original Kaluza-Klein theory in the framework of
modern embedding theories of the spacetime, such as the recent induced matter
approach. We show that in spite of their seeming similarity they constitute
rather distinct proposals as far as their geometrical structure is concerned.
| [
{
"created": "Sat, 15 May 2004 13:50:40 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Figueiredo",
"J. J.",
""
],
[
"Romero",
"C.",
""
]
] | We review and discuss the original Kaluza-Klein theory in the framework of modern embedding theories of the spacetime, such as the recent induced matter approach. We show that in spite of their seeming similarity they constitute rather distinct proposals as far as their geometrical structure is concerned. |
gr-qc/0606052 | Luis Herrera | L. Herrera, A. Di Prisco, J. Carot and N.O. Santos | Energetics of the Einstein-Rosen spacetime | 19 pages Latex.References added and updated.To appear in
Int.J.Theor.Phys | Int.J.Theor.Phys.47:380,2008 | 10.1007/s10773-007-9460-9 | null | gr-qc | null | A study covering some aspects of the Einstein--Rosen metric is presented. The
electric and magnetic parts of the Weyl tensor are calculated. It is shown that
there are no purely magnetic E--R spacetimes, and also that a purely electric
E--R spacetime is necessarily static. The geodesics equations are found and
circul... | [
{
"created": "Mon, 12 Jun 2006 18:27:53 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Apr 2007 19:37:22 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Herrera",
"L.",
""
],
[
"Di Prisco",
"A.",
""
],
[
"Carot",
"J.",
""
],
[
"Santos",
"N. O.",
""
]
] | A study covering some aspects of the Einstein--Rosen metric is presented. The electric and magnetic parts of the Weyl tensor are calculated. It is shown that there are no purely magnetic E--R spacetimes, and also that a purely electric E--R spacetime is necessarily static. The geodesics equations are found and circular... |
1901.00218 | Gon\c{c}alo Quinta | Gon\c{c}alo M. Quinta, Antonino Flachi, Jos\'e P. S. Lemos | Spontaneously broken symmetry restoration of quantum fields in the
vicinity of neutral and electrically charged black holes | 16 pages, 4 figures | JHEP 04 (2019) 139 | 10.1007/JHEP04(2019)139 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the restoration of a spontaneously broken symmetry of an
interacting quantum scalar field around neutral, i.e., Schwarzschild, and
electrically charged, i.e., Reissner-Nordstr\"om, black holes in four
dimensions. This is done through a semiclassical self-consistent procedure, by
solving the system of non-... | [
{
"created": "Tue, 1 Jan 2019 22:54:33 GMT",
"version": "v1"
}
] | 2019-09-25 | [
[
"Quinta",
"Gonçalo M.",
""
],
[
"Flachi",
"Antonino",
""
],
[
"Lemos",
"José P. S.",
""
]
] | We consider the restoration of a spontaneously broken symmetry of an interacting quantum scalar field around neutral, i.e., Schwarzschild, and electrically charged, i.e., Reissner-Nordstr\"om, black holes in four dimensions. This is done through a semiclassical self-consistent procedure, by solving the system of non-li... |
2006.16821 | Grigory Volovik | G.E. Volovik | Dimensionless physics | 8 pages, no figures, extended version of arXiv:2003.00915, draft
prepared for the issue of JETP devoted to Dzyaloshinskii-90 | null | 10.1134/S106377612104021X | null | gr-qc cond-mat.str-el hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss two scenarios of emergent gravity. In one of them the quantum
vacuum is considered as superplastic crystal, and the effective gravity
describes the dynamical elastic deformations of this crystal. In the other one
the gravitational tetrads emerge as the bilinear form of the fermionic fields.
In spite of the... | [
{
"created": "Tue, 30 Jun 2020 13:59:34 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jul 2020 11:07:57 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Jul 2020 15:12:55 GMT",
"version": "v3"
},
{
"created": "Sun, 19 Jul 2020 17:35:55 GMT",
"version": "v4"
},
{
"cre... | 2021-06-16 | [
[
"Volovik",
"G. E.",
""
]
] | We discuss two scenarios of emergent gravity. In one of them the quantum vacuum is considered as superplastic crystal, and the effective gravity describes the dynamical elastic deformations of this crystal. In the other one the gravitational tetrads emerge as the bilinear form of the fermionic fields. In spite of the e... |
2212.09896 | Ioannis Gialamas | Ioannis D. Gialamas, Kyriakos Tamvakis | Inflation in Metric-Affine Quadratic Gravity | 21 pages, 7 figures, 3 tables, JCAP accepted version | JCAP 03 (2023) 042 | 10.1088/1475-7516/2023/03/042 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | In the general framework of Metric-Affine theories of gravity, where the
metric and the connection are independent variables, we consider actions
quadratic in the Ricci scalar curvature and the Holst invariant (the
contraction of the Riemann curvature with the Levi-Civita antisymmetric tensor)
coupled non-minimally t... | [
{
"created": "Mon, 19 Dec 2022 22:37:43 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Mar 2023 15:06:25 GMT",
"version": "v2"
}
] | 2023-03-21 | [
[
"Gialamas",
"Ioannis D.",
""
],
[
"Tamvakis",
"Kyriakos",
""
]
] | In the general framework of Metric-Affine theories of gravity, where the metric and the connection are independent variables, we consider actions quadratic in the Ricci scalar curvature and the Holst invariant (the contraction of the Riemann curvature with the Levi-Civita antisymmetric tensor) coupled non-minimally to ... |
gr-qc/9507002 | Roberto Emparan | R. Emparan | Correlations between black holes formed in cosmic string breaking | 11 pages, LaTeX. Final version, to appear in Phys. Rev. D | Phys.Rev. D52 (1995) 6976-6981 | 10.1103/PhysRevD.52.6976 | EHU-FT/9511 | gr-qc hep-th | null | An analysis of cosmic string breaking with the formation of black holes
attached to the ends reveals a remarkable feature: the black holes can be
correlated or uncorrelated. We find that, as a consequence, the
number-of-states enhancement factor in the action governing the formation of
uncorrelated black holes is twi... | [
{
"created": "Mon, 3 Jul 1995 18:22:48 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 1995 16:27:52 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Emparan",
"R.",
""
]
] | An analysis of cosmic string breaking with the formation of black holes attached to the ends reveals a remarkable feature: the black holes can be correlated or uncorrelated. We find that, as a consequence, the number-of-states enhancement factor in the action governing the formation of uncorrelated black holes is twice... |
gr-qc/0401003 | Uwe Gunther | Uwe Guenther, Alexander Zhuk | Remarks on dimensional reduction of multidimensional cosmological models | 9 pages, Latex2e, Conf. Proc., Tenth Marcel Grossmann Meeting on
General Relativity, July 20-26, 2003, Rio de Janeiro, Brazil, presentation
and references extended | null | 10.1142/9789812704030_0052 | null | gr-qc hep-ph hep-th | null | Multidimensional cosmological models with factorizable geometry and their
dimensional reduction to effective four-dimensional theories are analyzed on
sensitivity to different scalings. It is shown that a non-correct gauging of
the effective four-dimensional gravitational constant within the dimensional
reduction res... | [
{
"created": "Fri, 2 Jan 2004 14:27:51 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Mar 2004 13:40:05 GMT",
"version": "v2"
}
] | 2016-11-09 | [
[
"Guenther",
"Uwe",
""
],
[
"Zhuk",
"Alexander",
""
]
] | Multidimensional cosmological models with factorizable geometry and their dimensional reduction to effective four-dimensional theories are analyzed on sensitivity to different scalings. It is shown that a non-correct gauging of the effective four-dimensional gravitational constant within the dimensional reduction resul... |
2212.08694 | Simone Mastrogiovanni | Jonathan R. Gair, Archisman Ghosh, Rachel Gray, Daniel E. Holz, Simone
Mastrogiovanni, Suvodip Mukherjee, Antonella Palmese, Nicola Tamanini, Tessa
Baker, Freija Beirnaert, Maciej Bilicki, Hsin-Yu Chen, Gergely D\'alya, Jose
Maria Ezquiaga, Will M. Farr, Maya Fishbach, Juan Garcia-Bellido, Tathagata
Ghosh, Hsia... | The Hitchhiker's guide to the galaxy catalog approach for gravitational
wave cosmology | 19 pages, 11 figures. Submitted to ApJ | null | 10.3847/1538-3881/acca78 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | We outline the ``dark siren'' galaxy catalog method for cosmological
inference using gravitational wave (GW) standard sirens, clarifying some common
misconceptions in the implementation of this method. When a confident transient
electromagnetic counterpart to a GW event is unavailable, the identification of
a unique ... | [
{
"created": "Fri, 16 Dec 2022 19:44:18 GMT",
"version": "v1"
}
] | 2023-06-28 | [
[
"Gair",
"Jonathan R.",
""
],
[
"Ghosh",
"Archisman",
""
],
[
"Gray",
"Rachel",
""
],
[
"Holz",
"Daniel E.",
""
],
[
"Mastrogiovanni",
"Simone",
""
],
[
"Mukherjee",
"Suvodip",
""
],
[
"Palmese",
"Antonella",
... | We outline the ``dark siren'' galaxy catalog method for cosmological inference using gravitational wave (GW) standard sirens, clarifying some common misconceptions in the implementation of this method. When a confident transient electromagnetic counterpart to a GW event is unavailable, the identification of a unique ho... |
gr-qc/9707015 | O. B. Zaslavskii | O.B.Zaslavskii | Geometry of nonextreme black holes near the extreme state | 10 pages, Revtex 3.0. To be published in Phys.Rev.D | Phys.Rev.D56:2188-2191,1997; Erratum-ibid.D59:069901,1999 | 10.1103/PhysRevD.56.2188 10.1103/PhysRevD.59.069901 | null | gr-qc hep-th | null | Nonextreme black hole in a cavity can achieve the extreme state with a zero
surface gravity at a finite temperature on a boundary, the proper distance
between the boundary and the horizon being finite. The classical geometry in
this state is found explicitly for four-dimensional spherically-symmetrical and
2+1 rotati... | [
{
"created": "Wed, 2 Jul 1997 12:49:38 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Zaslavskii",
"O. B.",
""
]
] | Nonextreme black hole in a cavity can achieve the extreme state with a zero surface gravity at a finite temperature on a boundary, the proper distance between the boundary and the horizon being finite. The classical geometry in this state is found explicitly for four-dimensional spherically-symmetrical and 2+1 rotating... |
1908.06023 | Stefano Viaggiu | Stefano Viaggiu | The physical origin of the cosmological constant: continuum limit and
the analogy with the Casimir effect | Accepted on Physica Scripta | null | 10.1088/1402-4896/ab3d02 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we continue the investigations in \cite{1} concerning the
origin of the cosmological constant. First of all, we generalise the results in
\cite{1,2} by considering a continuum approximation for a radiation field in a
cosmological background. In this way, we clearly show that the bare
cosmological consta... | [
{
"created": "Thu, 15 Aug 2019 11:26:50 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Aug 2019 15:19:01 GMT",
"version": "v2"
}
] | 2019-08-23 | [
[
"Viaggiu",
"Stefano",
""
]
] | In this paper we continue the investigations in \cite{1} concerning the origin of the cosmological constant. First of all, we generalise the results in \cite{1,2} by considering a continuum approximation for a radiation field in a cosmological background. In this way, we clearly show that the bare cosmological constant... |
gr-qc/9303003 | Marina Strakhova | A. Burinskii | String-Like Structures in Complex Kerr Geometry | 12 pages, AmS-TeX, Talk given at the Fourth Hungarian Relativity
Workshop organized by R.P. Kerr and Z. Perj\'es, G\'ardony, 12-17 July 1992 | null | null | Preprint NSI-8-93 | gr-qc hep-th | null | The Kerr geometry is represented as being created by a source moving along an
analytical complex world-line. The equivalence of this complex world-line and
an Euclidean version of complex strings (hyperbolic strings) is discussed. It
is shown that the complex Kerr source satisfies the corresponding string
equations. ... | [
{
"created": "Mon, 1 Mar 1993 13:42:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burinskii",
"A.",
""
]
] | The Kerr geometry is represented as being created by a source moving along an analytical complex world-line. The equivalence of this complex world-line and an Euclidean version of complex strings (hyperbolic strings) is discussed. It is shown that the complex Kerr source satisfies the corresponding string equations. Th... |
gr-qc/0302002 | Luis Augusto Trevisan | Luis Augusto Trevisan | A numerical analysis for G(t) in a scalar tensor theory | The 4 figures (ps files) were included | null | null | null | gr-qc | null | We calculated the evolution of the Newton gravitational in a scalar tensor
theory, using parameters that holds for the present Universe. We analised the
evolution from one billion of years ago.
| [
{
"created": "Mon, 3 Feb 2003 20:00:43 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Feb 2003 16:42:23 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Trevisan",
"Luis Augusto",
""
]
] | We calculated the evolution of the Newton gravitational in a scalar tensor theory, using parameters that holds for the present Universe. We analised the evolution from one billion of years ago. |
2408.05957 | Peng-Cheng Li | Tao Zhou and Peng-Cheng Li | Quasinormal modes of accelerating spacetime | 12 pages. arXiv admin note: text overlap with arXiv:gr-qc/0605027 by
other authors | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the exact values of the quasinormal frequencies for massless
perturbations with spin $s\leq2$ moving in pure accelerating spacetime. We use
two different methods to transfer the perturbation equations into the form of
hypergeometric differential equations and obtain the same quasinormal
frequencies. Thes... | [
{
"created": "Mon, 12 Aug 2024 07:19:33 GMT",
"version": "v1"
}
] | 2024-08-13 | [
[
"Zhou",
"Tao",
""
],
[
"Li",
"Peng-Cheng",
""
]
] | We calculate the exact values of the quasinormal frequencies for massless perturbations with spin $s\leq2$ moving in pure accelerating spacetime. We use two different methods to transfer the perturbation equations into the form of hypergeometric differential equations and obtain the same quasinormal frequencies. These ... |
gr-qc/0311050 | Tiberiu Harko | M. K. Mak, T. Harko | Full causal dissipative cosmologies with stiff matter | 6 pages, 6 figures, to appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys.D13:273-280,2004 | 10.1142/S0218271804004645 | null | gr-qc | null | The general solution of the gravitational field equations for a full causal
bulk viscous stiff cosmological fluid, with bulk viscosity coefficient
proportional to the energy density to the power 1/4, is obtained in the flat
Friedmann-Robertson-Walker geometry. The solution describes a non-inflationary
Universe, which... | [
{
"created": "Sat, 15 Nov 2003 02:15:09 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mak",
"M. K.",
""
],
[
"Harko",
"T.",
""
]
] | The general solution of the gravitational field equations for a full causal bulk viscous stiff cosmological fluid, with bulk viscosity coefficient proportional to the energy density to the power 1/4, is obtained in the flat Friedmann-Robertson-Walker geometry. The solution describes a non-inflationary Universe, which s... |
2308.12827 | Kristen Lackeos | Kristen Lackeos, Tyson B. Littenberg, Neil J. Cornish, James I. Thorpe | The LISA Data Challenge Radler Analysis and Time-dependent Ultra-compact
Binary Catalogues | null | A&A 678, A123 (2023) | 10.1051/0004-6361/202347222 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Context. Galactic binaries account for the loudest combined continuous
gravitational wave signal in the Laser Interferometer Space Antenna (LISA)
band, which spans a frequency range of 0.1 mHz to 1 Hz.
Aims. A superposition of low frequency Galactic and extragalactic signals and
instrument noise comprise the LISA d... | [
{
"created": "Thu, 24 Aug 2023 14:34:37 GMT",
"version": "v1"
}
] | 2023-10-18 | [
[
"Lackeos",
"Kristen",
""
],
[
"Littenberg",
"Tyson B.",
""
],
[
"Cornish",
"Neil J.",
""
],
[
"Thorpe",
"James I.",
""
]
] | Context. Galactic binaries account for the loudest combined continuous gravitational wave signal in the Laser Interferometer Space Antenna (LISA) band, which spans a frequency range of 0.1 mHz to 1 Hz. Aims. A superposition of low frequency Galactic and extragalactic signals and instrument noise comprise the LISA data ... |
1312.1018 | Israel Quiros | Israel Quiros | Scale invariance and broken electroweak symmetry may coexist together | 5 pages, no figures. Sustantial improvements: (i) the discussion on
generation of mass hierarchy complemented with necessary statements about the
measurable quantities in Weyl spaces, and (ii) unnecessary discussion on the
coosmological constant, not relevant to the main focus of the paper removed | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we show that local scale invariance -- invariance under Weyl rescalings
-- may safely coexist with broken electroweak symmetry if assume the Weyl
geometric theory to govern the affine structure of spacetime. We find that
within the resulting scale invariant theory of gravity cosmological inflation
is enough to e... | [
{
"created": "Wed, 4 Dec 2013 04:11:29 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Dec 2013 22:42:48 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Jan 2014 05:12:04 GMT",
"version": "v3"
}
] | 2014-01-06 | [
[
"Quiros",
"Israel",
""
]
] | Here we show that local scale invariance -- invariance under Weyl rescalings -- may safely coexist with broken electroweak symmetry if assume the Weyl geometric theory to govern the affine structure of spacetime. We find that within the resulting scale invariant theory of gravity cosmological inflation is enough to exp... |
1805.01004 | Moritz Reintjes | Moritz Reintjes and Blake Temple | The Regularity Transformation Equations: An elliptic mechanism for
smoothing gravitational metrics in General Relativity | Version 5: Subsections are promoted to sections. Version 3 & 4:
Improved wording, results unchanged. Version 2: We improved our main result,
Theorem 1.1, by replacing the problematic boundary data (1.5) with linear
data (eqn (1.5) in V.2), and we replaced eqns (1.1) - (1.2) of V.1 with the
Poisson equation (3.5... | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A central question in General Relativity (GR) is how to determine whether
singularities are geometrical properties of spacetime, or simply anomalies of a
coordinate system used to parameterize the spacetime. In particular, it is an
open problem whether there always exist coordinate transformations which smooth
a grav... | [
{
"created": "Wed, 2 May 2018 20:28:55 GMT",
"version": "v1"
},
{
"created": "Wed, 23 May 2018 21:50:36 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Sep 2018 12:30:09 GMT",
"version": "v3"
},
{
"created": "Thu, 9 May 2019 04:05:38 GMT",
"version": "v4"
},
{
"cre... | 2020-11-10 | [
[
"Reintjes",
"Moritz",
""
],
[
"Temple",
"Blake",
""
]
] | A central question in General Relativity (GR) is how to determine whether singularities are geometrical properties of spacetime, or simply anomalies of a coordinate system used to parameterize the spacetime. In particular, it is an open problem whether there always exist coordinate transformations which smooth a gravit... |
gr-qc/0312104 | Elizabeth Winstanley | Tom J.T. Harper, Paul A. Thomas, Elizabeth Winstanley and Phil M.
Young | Instability of a four-dimensional de Sitter black hole with a
conformally coupled scalar field | revtex4, 8 pages, 4 figures, minor changes, accepted for publication
in Phys. Rev. D | Phys.Rev. D70 (2004) 064023 | 10.1103/PhysRevD.70.064023 | null | gr-qc | null | We study the stability of new neutral and electrically charged
four-dimensional black hole solutions of Einstein's equations with a positive
cosmological constant and conformally coupled scalar field. The neutral black
holes are always unstable. The charged black holes are also shown analytically
to be unstable for t... | [
{
"created": "Tue, 23 Dec 2003 14:02:54 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Aug 2004 09:00:59 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Harper",
"Tom J. T.",
""
],
[
"Thomas",
"Paul A.",
""
],
[
"Winstanley",
"Elizabeth",
""
],
[
"Young",
"Phil M.",
""
]
] | We study the stability of new neutral and electrically charged four-dimensional black hole solutions of Einstein's equations with a positive cosmological constant and conformally coupled scalar field. The neutral black holes are always unstable. The charged black holes are also shown analytically to be unstable for the... |
gr-qc/9804011 | CJ Fewster | C.J. Fewster (Department of Mathematics, University of York) | A Unique Continuation Result for Klein-Gordon Bisolutions on a
2-dimensional Cylinder | LaTeX2e, 9 pages | Class.Quant.Grav.16:789-796,1999 | 10.1088/0264-9381/16/3/011 | null | gr-qc | null | We prove a novel unique continuation result for weak bisolutions to the
massive Klein-Gordon equation on a 2-dimensional cylinder M. Namely, if such a
bisolution vanishes in a neighbourhood of a `sufficiently large' portion of a
2-dimensional surface lying parallel to the diagonal in the product manifold of
M with it... | [
{
"created": "Fri, 3 Apr 1998 17:37:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Fewster",
"C. J.",
"",
"Department of Mathematics, University of York"
]
] | We prove a novel unique continuation result for weak bisolutions to the massive Klein-Gordon equation on a 2-dimensional cylinder M. Namely, if such a bisolution vanishes in a neighbourhood of a `sufficiently large' portion of a 2-dimensional surface lying parallel to the diagonal in the product manifold of M with itse... |
1303.2381 | Orfeu Bertolami | Orfeu Bertolami | Zen and the Art of Space-Time Manufacturing | Talk delivered at the Time Machine Factory conference, 14-19 October
2012, Turin, Italy | null | 10.1051/epjconf/20135802001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general discussion about the so-called emergent properties and
discuss whether space-time and gravity can be regarded as emergent features of
underlying more fundamental structures. Finally, we discuss some ideas about
the multiverse, and speculate on how our universe might arise from the
multiverse.
| [
{
"created": "Sun, 10 Mar 2013 21:51:57 GMT",
"version": "v1"
}
] | 2017-03-22 | [
[
"Bertolami",
"Orfeu",
""
]
] | We present a general discussion about the so-called emergent properties and discuss whether space-time and gravity can be regarded as emergent features of underlying more fundamental structures. Finally, we discuss some ideas about the multiverse, and speculate on how our universe might arise from the multiverse. |
0810.1790 | Takashi Torii | Takashi Torii, Hisa-aki Shinkai | $N+1$ formalism in Einstein-Gauss-Bonnet gravity | 15pages, no figure, to appear in PRD | Phys.Rev.D78:084037,2008 | 10.1103/PhysRevD.78.084037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Towards the investigation of the full dynamics in higher-dimensional and/or
stringy gravitational model, we present the basic equations of the
Einstein-Gauss-Bonnet gravity theory. We show $(N+1)$-dimensional version of
the ADM decomposition including Gauss-Bonnet terms, which shall be the standard
approach to treat ... | [
{
"created": "Fri, 10 Oct 2008 01:22:44 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Torii",
"Takashi",
""
],
[
"Shinkai",
"Hisa-aki",
""
]
] | Towards the investigation of the full dynamics in higher-dimensional and/or stringy gravitational model, we present the basic equations of the Einstein-Gauss-Bonnet gravity theory. We show $(N+1)$-dimensional version of the ADM decomposition including Gauss-Bonnet terms, which shall be the standard approach to treat th... |
1108.4791 | Patryk Mach | Patryk Mach and Walter Simon | (In)finite extent of stationary perfect fluids in Newtonian theory | Corrections according to the version accepted by Ann. Henri Poincare | null | 10.1007/s00023-012-0181-0 | null | gr-qc astro-ph.SR math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For stationary, barotropic fluids in Newtonian gravity we give simple
criteria on the equation of state and the "law of motion" which guarantee
finite or infinite extent of the fluid region (providing a priori estimates for
the corresponding stationary Newton-Euler system). Under more restrictive
conditions, we can a... | [
{
"created": "Wed, 24 Aug 2011 09:12:03 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Apr 2012 16:38:50 GMT",
"version": "v2"
}
] | 2012-05-01 | [
[
"Mach",
"Patryk",
""
],
[
"Simon",
"Walter",
""
]
] | For stationary, barotropic fluids in Newtonian gravity we give simple criteria on the equation of state and the "law of motion" which guarantee finite or infinite extent of the fluid region (providing a priori estimates for the corresponding stationary Newton-Euler system). Under more restrictive conditions, we can als... |
2305.19336 | Simone Albanesi | Simone Albanesi, Sebastiano Bernuzzi, Thibault Damour, Alessandro
Nagar, Andrea Placidi | Faithful effective-one-body waveform of small-mass-ratio coalescing
black hole binaries: the eccentric, nonspinning, case | 23+6 pages, 20+3 figures, updated according to published version
(PRD) | null | 10.1103/PhysRevD.108.084037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new effective-one-body (EOB) waveform for eccentric,
nonspinning, binaries in the extreme mass ratio limit, with initial
eccentricities up to $0.95$. The EOB analytical waveform, that includes
noncircular corrections up to second post-Newtonian order, is completed by a
phenomenological ringdown model tha... | [
{
"created": "Tue, 30 May 2023 18:03:42 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2023 16:27:03 GMT",
"version": "v2"
}
] | 2023-10-24 | [
[
"Albanesi",
"Simone",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Damour",
"Thibault",
""
],
[
"Nagar",
"Alessandro",
""
],
[
"Placidi",
"Andrea",
""
]
] | We present a new effective-one-body (EOB) waveform for eccentric, nonspinning, binaries in the extreme mass ratio limit, with initial eccentricities up to $0.95$. The EOB analytical waveform, that includes noncircular corrections up to second post-Newtonian order, is completed by a phenomenological ringdown model that ... |
gr-qc/0401019 | Carlos Palenzuela | C. Bona and C. Palenzuela | Dynamical shift conditions for the Z4 and BSSN hyperbolic formalisms | text changed, accepted in PRD | Phys.Rev.D69:104003,2004 | 10.1103/PhysRevD.69.104003 | null | gr-qc | null | A class of dynamical shift conditions is shown to lead to a strongly
hyperbolic evolution system, both in the Z4 and in the BSSN Numerical
Relativity formalisms. This class generalizes the harmonic shift condition,
where light speed is the only non-trivial characteristic speed, and it is
contained into the multi-para... | [
{
"created": "Wed, 7 Jan 2004 11:19:44 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Mar 2004 10:46:01 GMT",
"version": "v2"
}
] | 2011-04-21 | [
[
"Bona",
"C.",
""
],
[
"Palenzuela",
"C.",
""
]
] | A class of dynamical shift conditions is shown to lead to a strongly hyperbolic evolution system, both in the Z4 and in the BSSN Numerical Relativity formalisms. This class generalizes the harmonic shift condition, where light speed is the only non-trivial characteristic speed, and it is contained into the multi-parame... |
2008.03817 | Matt Visser | Joshua Baines (Victoria University of Wellington), Thomas Berry
(Victoria University of Wellington), Alex Simpson (Victoria University of
Wellington), and Matt Visser (Victoria University of Wellington) | Unit-lapse versions of the Kerr spacetime | 29 pages | null | 10.1088/1361-6382/abd071 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Kerr spacetime is perhaps the most astrophysically important of the
currently known exact solutions to the Einstein field equations. Whenever
spacetimes can be put in unit-lapse form it becomes possible to identify some
very straightforward timelike geodesics, (the "rain" geodesics), making the
physical interpret... | [
{
"created": "Sun, 9 Aug 2020 21:32:58 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Baines",
"Joshua",
"",
"Victoria University of Wellington"
],
[
"Berry",
"Thomas",
"",
"Victoria University of Wellington"
],
[
"Simpson",
"Alex",
"",
"Victoria University of\n Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University... | The Kerr spacetime is perhaps the most astrophysically important of the currently known exact solutions to the Einstein field equations. Whenever spacetimes can be put in unit-lapse form it becomes possible to identify some very straightforward timelike geodesics, (the "rain" geodesics), making the physical interpretat... |
2109.01871 | Emanuelis Lazauskas | Emanuelis Lazauskas | Scalar Gravity and the Double Copy in the Framework of General
Relativity | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classical double copy relations establish correspondence between exact
gravity solutions and their counterparts in biadjoint and gauge theories. In
this work, we investigate a peculiar case of double copy relations arising in
exact solutions of the scalar gravity equation, relating static spacetime
geometry to th... | [
{
"created": "Sat, 4 Sep 2021 13:57:18 GMT",
"version": "v1"
}
] | 2021-09-07 | [
[
"Lazauskas",
"Emanuelis",
""
]
] | The classical double copy relations establish correspondence between exact gravity solutions and their counterparts in biadjoint and gauge theories. In this work, we investigate a peculiar case of double copy relations arising in exact solutions of the scalar gravity equation, relating static spacetime geometry to the ... |
2311.17509 | Carla Cederbaum | Carla Cederbaum and Sophia Jahns and Olivia Vi\v{c}\'anek Mart\'inez | On equipotential photon surfaces in (electro-)static spacetimes of
arbitrary dimension | 66 pages, 14 figures. Comments very welcome! | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study timelike, totally umbilic hypersurfaces -- called photon surfaces --
in $n+1$-dimensional static, asymptotically flat spacetimes, for $n+1\geq4$.
First, we give a complete characterization of photon surfaces in a class of
spherically symmetric spacetimes containing the (exterior) subextremal
Reissner--Nordst... | [
{
"created": "Wed, 29 Nov 2023 10:33:44 GMT",
"version": "v1"
}
] | 2023-11-30 | [
[
"Cederbaum",
"Carla",
""
],
[
"Jahns",
"Sophia",
""
],
[
"Martínez",
"Olivia Vičánek",
""
]
] | We study timelike, totally umbilic hypersurfaces -- called photon surfaces -- in $n+1$-dimensional static, asymptotically flat spacetimes, for $n+1\geq4$. First, we give a complete characterization of photon surfaces in a class of spherically symmetric spacetimes containing the (exterior) subextremal Reissner--Nordstr\... |
1006.1122 | Israel Quiros | Ricardo Garc\'ia-Salcedo, Tame Gonzalez, Claudia Moreno, Israel Quiros | Randall-Sundrum brane cosmology: modification of late-time cosmic
dynamics by exotic matter | Latex, 12 pages, 9 eps figures. Title changed, discussion improved.
Version that matches the one published in CQG | Class.Quant.Grav.28:105017,2011 | 10.1088/0264-9381/28/10/105017 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we show, through the study of concrete examples, that,
depending on the cosmic dynamics of the energy density of matter degrees of
freedom living in the brane, Randall-Sundrum (RS) brane effects can be
important not only at short distances (UV regime), but also at large
cosmological scales (IR regime). ... | [
{
"created": "Sun, 6 Jun 2010 17:25:24 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jun 2010 21:08:44 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Sep 2010 15:38:44 GMT",
"version": "v3"
},
{
"created": "Thu, 18 Aug 2011 16:10:34 GMT",
"version": "v4"
}
] | 2011-08-19 | [
[
"García-Salcedo",
"Ricardo",
""
],
[
"Gonzalez",
"Tame",
""
],
[
"Moreno",
"Claudia",
""
],
[
"Quiros",
"Israel",
""
]
] | In this paper we show, through the study of concrete examples, that, depending on the cosmic dynamics of the energy density of matter degrees of freedom living in the brane, Randall-Sundrum (RS) brane effects can be important not only at short distances (UV regime), but also at large cosmological scales (IR regime). Ou... |
gr-qc/0412137 | Deborah A. Konkowski | D.A. Konkowski and T.M. Helliwell | Mining metrics for buried treasure | 16 pages, no figures, minor grammatical changes, submitted to
Proceedings of the Malcolm@60 Conference (London, July 2004) | Gen.Rel.Grav. 38 (2006) 1069-1082 | 10.1007/s10714-006-0289-y | null | gr-qc | null | The same but different: That might describe two metrics. On the surface
CLASSI may show two metrics are locally equivalent, but buried beneath one may
be a wealth of further structure. This was beautifully described in a paper by
M.A.H. MacCallum in 1998. Here I will illustrate the effect with two flat
metrics -- one... | [
{
"created": "Thu, 30 Dec 2004 18:26:49 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jan 2005 00:12:39 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Konkowski",
"D. A.",
""
],
[
"Helliwell",
"T. M.",
""
]
] | The same but different: That might describe two metrics. On the surface CLASSI may show two metrics are locally equivalent, but buried beneath one may be a wealth of further structure. This was beautifully described in a paper by M.A.H. MacCallum in 1998. Here I will illustrate the effect with two flat metrics -- one d... |
1601.01735 | Koray D\"uzta\c{s} | Koray D\"uzta\c{s} | Coulomb fields as perturbations of type D vacuum space-times | More detailed than the published version | Eur. Phys. J. Plus (2017) 132:406 | 10.1140/epjp/i2017-11710-7 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a test, non-null electromagnetic field special in the sense that
the principal null directions of the field lie along the two repeated principal
null directions of the type D vacuum background. We prove that the special
non-null field is a valid solution of the Maxwell equations on a type D
background. Th... | [
{
"created": "Fri, 8 Jan 2016 00:55:12 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Sep 2016 21:58:45 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Oct 2017 08:54:29 GMT",
"version": "v3"
}
] | 2017-10-13 | [
[
"Düztaş",
"Koray",
""
]
] | We consider a test, non-null electromagnetic field special in the sense that the principal null directions of the field lie along the two repeated principal null directions of the type D vacuum background. We prove that the special non-null field is a valid solution of the Maxwell equations on a type D background. This... |
gr-qc/0607107 | Z. Turakulov Ya. | Z. Y. Turakulov, A. T. Muminov | Motion of a vector particle in a curved space-time. III. Development of
techniques of calculation | 9 pages, no figures | Mod.Phys.Lett.A21:1981-1990,2006 | 10.1142/S0217732306021293 | null | gr-qc | null | The studies of influence of spin on a photon's motion in a Schwartzschild
spacetime is continued. In the previous paper [13] the first order correction
to the geodesic motion is found for the first half of the photon world line.
The system of equations for the first order correction to the geodesic motion
is reduced ... | [
{
"created": "Mon, 24 Jul 2006 13:12:55 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Turakulov",
"Z. Y.",
""
],
[
"Muminov",
"A. T.",
""
]
] | The studies of influence of spin on a photon's motion in a Schwartzschild spacetime is continued. In the previous paper [13] the first order correction to the geodesic motion is found for the first half of the photon world line. The system of equations for the first order correction to the geodesic motion is reduced to... |
2112.01536 | Muhammad Sharif | M. Sharif and Sulaman Shaukat | Greybody Factor for a Rotating Bardeen Black Hole by Perfect Fluid Dark
Matter | 21 pages, 6 figures | Annals Phys. 436(2022)168673 | 10.1016/j.aop.2021.168673 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the greybody factor is studied analytically for a rotating
regular Bardeen black hole surrounded by perfect fluid dark matter. Firstly, we
examine the behavior of effective potential by using the radial equation of
motion developed from the Klein-Gordon equation. We then consider tortoise
coordinate to... | [
{
"created": "Thu, 2 Dec 2021 05:13:13 GMT",
"version": "v1"
}
] | 2022-01-05 | [
[
"Sharif",
"M.",
""
],
[
"Shaukat",
"Sulaman",
""
]
] | In this paper, the greybody factor is studied analytically for a rotating regular Bardeen black hole surrounded by perfect fluid dark matter. Firstly, we examine the behavior of effective potential by using the radial equation of motion developed from the Klein-Gordon equation. We then consider tortoise coordinate to c... |
2106.07981 | Chen Songbai | Zelin Zhang, Songbai Chen, Xin Qin, Jiliang Jing | Polarized image of a Schwarzschild black hole with a thin accretion disk
as photon couples to Weyl tensor | 15 pages, 11 figures, the accepted version for publication in EPJC | Eur. Phys. J. C (2021) 81:991 | 10.1140/epjc/s10052-021-09786-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied polarized image of a Schwarzschild black hole with an
equatorial thin accretion disk as photon couples to Weyl tensor. The
birefringence of photon originating from the coupling affect the black hole
shadow, the thin disk pattern and its luminosity distribution. We also analyze
the observed polarized i... | [
{
"created": "Tue, 15 Jun 2021 08:58:09 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Nov 2021 08:56:55 GMT",
"version": "v2"
}
] | 2021-11-15 | [
[
"Zhang",
"Zelin",
""
],
[
"Chen",
"Songbai",
""
],
[
"Qin",
"Xin",
""
],
[
"Jing",
"Jiliang",
""
]
] | We have studied polarized image of a Schwarzschild black hole with an equatorial thin accretion disk as photon couples to Weyl tensor. The birefringence of photon originating from the coupling affect the black hole shadow, the thin disk pattern and its luminosity distribution. We also analyze the observed polarized int... |
2011.06930 | Mohd Shahalam | M. Shahalam, Shynaray Myrzakul | Dynamics of nonminimally coupled scalar field models with generic
potentials in FLRW background | 13 pages, 5 figures. arXiv admin note: text overlap with
arXiv:1905.06856 | Gen Relativ Gravit 53, 45 (2021) | 10.1007/s10714-021-02796-1 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the phase space analysis of a nonminimally coupled scalar field
model with different potentials such as KKLT, Higgs, inverse and inverse
square. Our investigation brings new asymptotic regimes, and obtains stable
de-Sitter solution. In case of KKLT, we do not find stable de-Sitter solution
whereas Higgs mode... | [
{
"created": "Thu, 12 Nov 2020 02:50:03 GMT",
"version": "v1"
}
] | 2021-04-27 | [
[
"Shahalam",
"M.",
""
],
[
"Myrzakul",
"Shynaray",
""
]
] | We study the phase space analysis of a nonminimally coupled scalar field model with different potentials such as KKLT, Higgs, inverse and inverse square. Our investigation brings new asymptotic regimes, and obtains stable de-Sitter solution. In case of KKLT, we do not find stable de-Sitter solution whereas Higgs model ... |
gr-qc/0209060 | Sergi R. Hildebrandt | Sergi R. Hildebrandt | A physical application of Kerr-Schild groups | 18 pages | Gen. Rel. Grav., vol. 34 (2002) 159--174 | 10.1023/A:1015380109397 | null | gr-qc | null | The present work deals with the search of useful physical applications of
some generalized groups of metric transformations. We put forward different
proposals and focus our attention on the implementation of one of them.
Particularly, the results show how one can control very efficiently the kind of
spacetimes relat... | [
{
"created": "Wed, 18 Sep 2002 17:49:57 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"Hildebrandt",
"Sergi R.",
""
]
] | The present work deals with the search of useful physical applications of some generalized groups of metric transformations. We put forward different proposals and focus our attention on the implementation of one of them. Particularly, the results show how one can control very efficiently the kind of spacetimes related... |
gr-qc/0608107 | Dr. Anirudh Pradhan | Anirudh Pradhan, Ajay Kumar Singh and Saeed Otarod | FRW Universe with Variable $G$ and $\Lambda$-Terms | 15 pages, 8 figures | Rom.J.Phys.52:445-458,2007 | null | null | gr-qc | null | A new class of exact solutions of Einstein's field equations with a perfect
fluid source, variable gravitational coupling $G$ and cosmological term
$\Lambda$ for FRW spacetime is obtained by considering variable deceleration
parameter models for the universe. The nature of the variables $G(t)$,
$\Lambda(t)$ and the e... | [
{
"created": "Wed, 23 Aug 2006 13:23:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pradhan",
"Anirudh",
""
],
[
"Singh",
"Ajay Kumar",
""
],
[
"Otarod",
"Saeed",
""
]
] | A new class of exact solutions of Einstein's field equations with a perfect fluid source, variable gravitational coupling $G$ and cosmological term $\Lambda$ for FRW spacetime is obtained by considering variable deceleration parameter models for the universe. The nature of the variables $G(t)$, $\Lambda(t)$ and the ene... |
1612.04551 | Edward Wilson-Ewing | Edward Wilson-Ewing | Testing loop quantum cosmology | 20 pages. Invited review for special edition "Testing quantum gravity
with cosmology" of Comptes Rendus Physique | Comptes Rendus Physique 18 (2017) 207-225 | 10.1016/j.crhy.2017.02.004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Loop quantum cosmology predicts that quantum gravity effects resolve the
big-bang singularity and replace it by a cosmic bounce. Furthermore, loop
quantum cosmology can also modify the form of primordial cosmological
perturbations, for example by reducing power at large scales in inflationary
models or by suppressing... | [
{
"created": "Wed, 14 Dec 2016 09:26:31 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Feb 2017 13:56:50 GMT",
"version": "v2"
}
] | 2017-06-28 | [
[
"Wilson-Ewing",
"Edward",
""
]
] | Loop quantum cosmology predicts that quantum gravity effects resolve the big-bang singularity and replace it by a cosmic bounce. Furthermore, loop quantum cosmology can also modify the form of primordial cosmological perturbations, for example by reducing power at large scales in inflationary models or by suppressing t... |
2401.11109 | Tingqi Cai | Tingqi Cai and Yi Wang | A Topological Drive for Spacetime Travel | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a toy metric of spacetime travel from topological change. A
bubble-like baby universe is detached and re-attached from our universe.
Depending on where the bubble is re-attached, matter may travel superluminally
or backwards-in-time through the bubble. Quasiregular singularities are formed
at the detachmen... | [
{
"created": "Sat, 20 Jan 2024 04:10:52 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2024 05:25:33 GMT",
"version": "v2"
}
] | 2024-06-17 | [
[
"Cai",
"Tingqi",
""
],
[
"Wang",
"Yi",
""
]
] | We present a toy metric of spacetime travel from topological change. A bubble-like baby universe is detached and re-attached from our universe. Depending on where the bubble is re-attached, matter may travel superluminally or backwards-in-time through the bubble. Quasiregular singularities are formed at the detachment ... |
1504.01065 | Jan Ambjorn | J. Ambjorn, A. Goerlich, J. Jurkiewicz and R. Loll | Wilson loops in CDT quantum gravity | null | Phys. Rev. D 92, 024013 (2015) | 10.1103/PhysRevD.92.024013 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By explicit construction, we show that one can in a simple way introduce and
measure gravitational holonomies and Wilson loops in lattice formulations of
nonperturbative quantum gravity based on (Causal) Dynamical Triangulations. We
use this set-up to investigate a class of Wilson line observables associated
with the... | [
{
"created": "Sat, 4 Apr 2015 22:52:26 GMT",
"version": "v1"
}
] | 2015-07-15 | [
[
"Ambjorn",
"J.",
""
],
[
"Goerlich",
"A.",
""
],
[
"Jurkiewicz",
"J.",
""
],
[
"Loll",
"R.",
""
]
] | By explicit construction, we show that one can in a simple way introduce and measure gravitational holonomies and Wilson loops in lattice formulations of nonperturbative quantum gravity based on (Causal) Dynamical Triangulations. We use this set-up to investigate a class of Wilson line observables associated with the w... |
2011.14916 | Anisur Rahaman | Sohan Kumar Jha, Anisur Rahaman | Bumblebee gravity with a Kerr-Sen-like solution and its Shadow | 14 pages latex, 23 figures | Eur.Phys.J. C81 (2021) no.4, 345 | 10.1140/epjc/s10052-021-09132-6 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lorentz-Violating (LV) scenario gets involved through a bumblebee field
vector field $B_\mu$. A spontaneous symmetry breaking allows the field to
acquires a vacuum expectation value that generates LV into the system. A
Kerr-Sen-like solution has been found out starting from the generalized form of
a radiating station... | [
{
"created": "Fri, 27 Nov 2020 12:50:38 GMT",
"version": "v1"
}
] | 2021-05-11 | [
[
"Jha",
"Sohan Kumar",
""
],
[
"Rahaman",
"Anisur",
""
]
] | Lorentz-Violating (LV) scenario gets involved through a bumblebee field vector field $B_\mu$. A spontaneous symmetry breaking allows the field to acquires a vacuum expectation value that generates LV into the system. A Kerr-Sen-like solution has been found out starting from the generalized form of a radiating stationer... |
2103.06100 | Jan Steinhoff | Jan Steinhoff, Tanja Hinderer, Tim Dietrich, Francois Foucart | Spin effects on neutron star fundamental-mode dynamical tides:
phenomenology and comparison to numerical simulations | 24 pages. v2: updated references and git link | Phys. Rev. Research 3, 033129 (2021) | 10.1103/PhysRevResearch.3.033129 | null | gr-qc astro-ph.HE astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves from neutron star binary inspirals contain information on
strongly-interacting matter in unexplored, extreme regimes. Extracting this
requires robust theoretical models of the signatures of matter in the
gravitational-wave signals due to spin and tidal effects. In fact, spins can
have a significan... | [
{
"created": "Wed, 10 Mar 2021 14:55:27 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Mar 2021 12:28:13 GMT",
"version": "v2"
}
] | 2021-08-18 | [
[
"Steinhoff",
"Jan",
""
],
[
"Hinderer",
"Tanja",
""
],
[
"Dietrich",
"Tim",
""
],
[
"Foucart",
"Francois",
""
]
] | Gravitational waves from neutron star binary inspirals contain information on strongly-interacting matter in unexplored, extreme regimes. Extracting this requires robust theoretical models of the signatures of matter in the gravitational-wave signals due to spin and tidal effects. In fact, spins can have a significant ... |
1908.11265 | Burin Gumjudpai | Chonticha Kritpetch (IF Naresuan), Jarunee Sanongkhun (IF Naresuan),
Pichet Vanichchapongjaroen (IF Naresuan) and Burin Gumjudpai (IF Naresuan) | Non-linear Schr\"{o}dinger-type formulation of scalar field cosmology:
two barotropic fluids and exact solutions | 11 pages, 2 figures | Modern Physics Letters A, Vol. 35, No. 19, 2050157 (2020) | 10.1142/S0217732320501576 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Time-independent non-linear Schr\"{o}dinger-type (NLS) formulation of FRW
cosmology with canonical scalar field are considered in case of two barotropic
fluids. We derived Friedmann formulation variables in terms of NLS variables.
Seven exact solutions found by D'Ambroise \cite{DAmbroise:2010dgl} and one new
found so... | [
{
"created": "Thu, 29 Aug 2019 14:43:22 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 2020 18:00:25 GMT",
"version": "v2"
}
] | 2021-07-19 | [
[
"Kritpetch",
"Chonticha",
"",
"IF Naresuan"
],
[
"Sanongkhun",
"Jarunee",
"",
"IF Naresuan"
],
[
"Vanichchapongjaroen",
"Pichet",
"",
"IF Naresuan"
],
[
"Gumjudpai",
"Burin",
"",
"IF Naresuan"
]
] | Time-independent non-linear Schr\"{o}dinger-type (NLS) formulation of FRW cosmology with canonical scalar field are considered in case of two barotropic fluids. We derived Friedmann formulation variables in terms of NLS variables. Seven exact solutions found by D'Ambroise \cite{DAmbroise:2010dgl} and one new found solu... |
0803.3064 | Roberto Chan | R. Chan, M.F.A. da Silva, J.F. Villas da Rocha | Star Models with Dark Energy | 20 pages, 1 figure, references and some comments added, typos
corrected, in press GRG | Gen.Rel.Grav.41:1835-1851,2009 | 10.1007/s10714-008-0755-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have constructed star models consisting of four parts: (i) a homogeneous
inner core with anisotropic pressure (ii) an infinitesimal thin shell
separating the core and the envelope; (iii) an envelope of inhomogeneous
density and isotropic pressure; (iv) an infinitesimal thin shell matching the
envelope boundary and... | [
{
"created": "Thu, 20 Mar 2008 19:54:02 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Dec 2008 17:01:22 GMT",
"version": "v2"
}
] | 2012-10-25 | [
[
"Chan",
"R.",
""
],
[
"da Silva",
"M. F. A.",
""
],
[
"da Rocha",
"J. F. Villas",
""
]
] | We have constructed star models consisting of four parts: (i) a homogeneous inner core with anisotropic pressure (ii) an infinitesimal thin shell separating the core and the envelope; (iii) an envelope of inhomogeneous density and isotropic pressure; (iv) an infinitesimal thin shell matching the envelope boundary and t... |
gr-qc/9806083 | null | Vladimir S. Mashkevich (Institute of Physics, Kiev) | Quantum Fields in Curved Spacetime: Quantum-Gravitational Nonlocality
and Conservation of Particle Numbers | 17 pages, no figures, LATEX 2.09 | null | null | null | gr-qc hep-th | null | We argue that the conventional quantum field theory in curved spacetime has a
grave drawback: The canonical commutation relations for quantum fields and
conjugate momenta do not hold. Thus the conventional theory should be denounced
and the related results revised. A Hamiltonian version of the canonical
formalism for... | [
{
"created": "Sat, 20 Jun 1998 13:46:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mashkevich",
"Vladimir S.",
"",
"Institute of Physics, Kiev"
]
] | We argue that the conventional quantum field theory in curved spacetime has a grave drawback: The canonical commutation relations for quantum fields and conjugate momenta do not hold. Thus the conventional theory should be denounced and the related results revised. A Hamiltonian version of the canonical formalism for a... |
0811.1926 | Andrew J. S. Hamilton | Andrew J. S. Hamilton (JILA), Pedro P. Avelino (Porto) | The physics of the relativistic counter-streaming instability that
drives mass inflation inside black holes | 11 eps figures. 2nd version has minor revisions. 3rd version is
reformatted, has expanded abstract, and some additional minor revisions. 4th
version as accepted for publication in Physics Reports | Phys.Rept.495:1-32, 2010 | 10.1016/j.physrep.2010.06.002 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If you fall into a real astronomical black hole (choosing a supermassive
black hole, to make sure that the tidal forces don't get you first), then you
will probably meet your fate not at a central singularity, but rather in the
exponentially growing, relativistic counter-streaming instability at the inner
horizon fir... | [
{
"created": "Wed, 12 Nov 2008 16:00:57 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Dec 2008 21:40:30 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Mar 2009 17:32:09 GMT",
"version": "v3"
},
{
"created": "Tue, 15 Jun 2010 17:36:50 GMT",
"version": "v4"
}
] | 2015-03-13 | [
[
"Hamilton",
"Andrew J. S.",
"",
"JILA"
],
[
"Avelino",
"Pedro P.",
"",
"Porto"
]
] | If you fall into a real astronomical black hole (choosing a supermassive black hole, to make sure that the tidal forces don't get you first), then you will probably meet your fate not at a central singularity, but rather in the exponentially growing, relativistic counter-streaming instability at the inner horizon first... |
1810.10504 | Khalid Saifullah | Rehana Rahim and Khalid Saifullah | Charging the Johannsen-Psaltis spacetime | Matches the published version | Annals of Physics 405 (2019) 220 | 10.1016/j.aop.2019.03.007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we develop the charged version of the spacetime proposed by
Johannsen and Psaltis. Rotation is introduced in the deformed
Reissner-Nordstr\"om spacetime by complex coordinate transformation. The event
horizon and Killing horizon are studied. Killing horizons are represented
graphically also. The analysi... | [
{
"created": "Wed, 24 Oct 2018 17:23:38 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Apr 2019 18:32:36 GMT",
"version": "v2"
}
] | 2019-04-22 | [
[
"Rahim",
"Rehana",
""
],
[
"Saifullah",
"Khalid",
""
]
] | In this paper we develop the charged version of the spacetime proposed by Johannsen and Psaltis. Rotation is introduced in the deformed Reissner-Nordstr\"om spacetime by complex coordinate transformation. The event horizon and Killing horizon are studied. Killing horizons are represented graphically also. The analysis ... |
1207.6348 | Simone Speziale | Simone Speziale and Wolfgang M. Wieland | The twistorial structure of loop-gravity transition amplitudes | 40 pages, 3 figures. v2: minor improvements, references added | null | 10.1103/PhysRevD.86.124023 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spin foam formalism provides transition amplitudes for loop quantum
gravity. Important aspects of the dynamics are understood, but many open
questions are pressing on. In this paper we address some of them using a
twistorial description, which brings new light on both classical and quantum
aspects of the theory. ... | [
{
"created": "Thu, 26 Jul 2012 17:48:07 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Sep 2012 10:31:07 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Speziale",
"Simone",
""
],
[
"Wieland",
"Wolfgang M.",
""
]
] | The spin foam formalism provides transition amplitudes for loop quantum gravity. Important aspects of the dynamics are understood, but many open questions are pressing on. In this paper we address some of them using a twistorial description, which brings new light on both classical and quantum aspects of the theory. At... |
2002.02695 | Francisco Pedro | Michele Cicoli, Giuseppe Dibitetto, Francisco G. Pedro | New accelerating solutions in late-time cosmology | null | Phys. Rev. D 101, 103524 (2020) | 10.1103/PhysRevD.101.103524 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark energy models can be seen as dynamical systems. In this paper we show
that multi-field models with a curved field space give rise to new critical
points and we analyse their stability. These are new accelerating solutions in
late-time cosmology which exist even for steep potentials. This opens up the
possibility... | [
{
"created": "Fri, 7 Feb 2020 10:06:06 GMT",
"version": "v1"
}
] | 2020-05-27 | [
[
"Cicoli",
"Michele",
""
],
[
"Dibitetto",
"Giuseppe",
""
],
[
"Pedro",
"Francisco G.",
""
]
] | Dark energy models can be seen as dynamical systems. In this paper we show that multi-field models with a curved field space give rise to new critical points and we analyse their stability. These are new accelerating solutions in late-time cosmology which exist even for steep potentials. This opens up the possibility t... |
gr-qc/9909063 | Jorge Pullin | C. Di Bartolo, R. Gambini, J. Griego, J. Pullin | Consistent canonical quantization of general relativity in the space of
Vassiliev knot invariants | 4 pages, RevTex, one figure | Phys.Rev.Lett.84:2314-2317,2000 | 10.1103/PhysRevLett.84.2314 | CGPG-99-9-5 | gr-qc hep-th | null | We present a quantization of the Hamiltonian and diffeomorphism constraint of
canonical quantum gravity in the spin network representation. The novelty
consists in considering a space of wavefunctions based on the Vassiliev knot
invariants. The constraints are finite, well defined, and reproduce at the
level of quant... | [
{
"created": "Tue, 21 Sep 1999 08:24:33 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Di Bartolo",
"C.",
""
],
[
"Gambini",
"R.",
""
],
[
"Griego",
"J.",
""
],
[
"Pullin",
"J.",
""
]
] | We present a quantization of the Hamiltonian and diffeomorphism constraint of canonical quantum gravity in the spin network representation. The novelty consists in considering a space of wavefunctions based on the Vassiliev knot invariants. The constraints are finite, well defined, and reproduce at the level of quantum... |
1407.1936 | Manuel Malaver D | Manuel Malaver | Quark star model with charge distributions | Relativistic Objects; Electric Field; Gravitational Potential;
Adjustable Parameter; Einstein-Maxwell System; Charge Density | Open Science Journal of Modern Physics,1(1),pp.6-11,2014 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we studied the behavior of relativistic objects with
anisotropic matter distribution inthe presence of an electric field considering
a gravitational potential Z(x) of Thirukkanesh and Ragel (2013) which depends
on an adjustable parameter n. The equation of state presents a quadratic
relation between th... | [
{
"created": "Tue, 8 Jul 2014 03:00:13 GMT",
"version": "v1"
}
] | 2014-07-09 | [
[
"Malaver",
"Manuel",
""
]
] | In this paper, we studied the behavior of relativistic objects with anisotropic matter distribution inthe presence of an electric field considering a gravitational potential Z(x) of Thirukkanesh and Ragel (2013) which depends on an adjustable parameter n. The equation of state presents a quadratic relation between the ... |
1610.05282 | Jose Luis Bl\'azquez-Salcedo | Jose Luis Bl\'azquez-Salcedo, Jutta Kunz, Francisco Navarro-L\'erida,
Eugen Radu | Charged rotating black holes in Einstein--Maxwell--Chern-Simons theory
with a negative cosmological constant | 30 pages, 17 figures; added references; replaced to match published
version in PRD | Phys. Rev. D 95, 064018 (2017) | 10.1103/PhysRevD.95.064018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider rotating black hole solutions in five-dimensional
Einstein-Maxwell-Chern-Simons theory with a negative cosmological constant and
a generic value of the Chern-Simons coupling constant $\lambda$. Using both
analytical and numerical techniques, we focus on cohomogeneity-1
configurations, with two equal-magni... | [
{
"created": "Mon, 17 Oct 2016 19:29:36 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Oct 2016 09:45:39 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Mar 2017 09:58:11 GMT",
"version": "v3"
}
] | 2017-03-29 | [
[
"Blázquez-Salcedo",
"Jose Luis",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Navarro-Lérida",
"Francisco",
""
],
[
"Radu",
"Eugen",
""
]
] | We consider rotating black hole solutions in five-dimensional Einstein-Maxwell-Chern-Simons theory with a negative cosmological constant and a generic value of the Chern-Simons coupling constant $\lambda$. Using both analytical and numerical techniques, we focus on cohomogeneity-1 configurations, with two equal-magnitu... |
gr-qc/0310041 | Achamveedu Gopakumar | Gerhard Sch\"afer and Achamveedu Gopakumar | A minimal no-radiation approximation to Einstein's field equations | 9 pages | Phys.Rev.D69:021501,2004 | 10.1103/PhysRevD.69.021501 | null | gr-qc | null | An approximation to Einstein's field equations in Arnowitt-Deser-Misner (ADM)
canonical formalism is presented which corresponds to the magneto-hydrodynamics
(MHD) approximation in electrodynamics. It results in coupled elliptic
equations which represent the maximum of elliptic-type structure of Einstein's
theory and... | [
{
"created": "Tue, 7 Oct 2003 16:06:14 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Schäfer",
"Gerhard",
""
],
[
"Gopakumar",
"Achamveedu",
""
]
] | An approximation to Einstein's field equations in Arnowitt-Deser-Misner (ADM) canonical formalism is presented which corresponds to the magneto-hydrodynamics (MHD) approximation in electrodynamics. It results in coupled elliptic equations which represent the maximum of elliptic-type structure of Einstein's theory and n... |
1204.0295 | Mir Faizal | Mir Faizal | Noncommutativity and Non-anticommutativity in Perturbative Quantum
Gravity | 9 pages, 0 figures, accepted for publication in Mod. Phys. Lett. A | Mod. Phys. Lett. A27: 1250075, 2012 | 10.1142/S0217732312500757 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we will study perturbative quantum gravity on supermanifolds
with both noncommutative and non-anticommutative coordinates. We shall first
analyses the BRST and the anti-BRST symmetries of this theory. Then we will
also analyze the effect of shifting all the fields of this theory in background
field meth... | [
{
"created": "Mon, 2 Apr 2012 02:28:06 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Faizal",
"Mir",
""
]
] | In this paper we will study perturbative quantum gravity on supermanifolds with both noncommutative and non-anticommutative coordinates. We shall first analyses the BRST and the anti-BRST symmetries of this theory. Then we will also analyze the effect of shifting all the fields of this theory in background field method... |
2106.08342 | B\'eatrice Bonga | B\'eatrice Bonga and Huan Yang | Mimicking Kerr's multipole moments | 8 pages, 3 figures; updated to match the published version (includes
an extended introduction and discussion) | Phys. Rev. D, 104, 2021, 084040 | 10.1103/PhysRevD.104.084040 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Multipole moments carry a lot of information about the gravitational field.
Nonetheless, knowing all the multipole moments of an object does not determine
conclusively the nature of the object itself. In particular, the multipole
moments of the Kerr spacetime are not unique. Here we construct several
physically motiv... | [
{
"created": "Tue, 15 Jun 2021 18:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Oct 2021 08:47:47 GMT",
"version": "v2"
}
] | 2021-10-14 | [
[
"Bonga",
"Béatrice",
""
],
[
"Yang",
"Huan",
""
]
] | Multipole moments carry a lot of information about the gravitational field. Nonetheless, knowing all the multipole moments of an object does not determine conclusively the nature of the object itself. In particular, the multipole moments of the Kerr spacetime are not unique. Here we construct several physically motivat... |
1604.05052 | Jerzy Kijowski | Jerzy Kijowski | Universality of the Einstein theory of gravitation | null | null | 10.1142/S0219887816400089 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that generalizations of general relativity theory, which consist in
replacing the Hilbert Lagrangian $L_{Hilbert} = \frac 1{16\pi} \sqrt{|g|} R$ by
a generic scalar density $L=L(g_{\mu\nu}, R^\lambda_{\mu\nu\kappa})$ depending
upon the metric $g_{\mu\nu}$ and the curvature tensor
$R^\lambda_{\mu\nu\kappa}$, a... | [
{
"created": "Mon, 18 Apr 2016 09:18:29 GMT",
"version": "v1"
}
] | 2016-09-21 | [
[
"Kijowski",
"Jerzy",
""
]
] | We show that generalizations of general relativity theory, which consist in replacing the Hilbert Lagrangian $L_{Hilbert} = \frac 1{16\pi} \sqrt{|g|} R$ by a generic scalar density $L=L(g_{\mu\nu}, R^\lambda_{\mu\nu\kappa})$ depending upon the metric $g_{\mu\nu}$ and the curvature tensor $R^\lambda_{\mu\nu\kappa}$, are... |
1112.0575 | Iain Brown | Iain A. Brown and Amir Hammami | Gauge Issues in Extended Gravity and f(R) Cosmology | 12 pages, REVTeX4. Replaced with version accepted by JCAP. Citations
added and some clarifications | JCAP 04 (2012) 002 | 10.1088/1475-7516/2012/04/002 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider issues related to the conformal mapping between the Einstein and
Jordan frames in f(R) cosmology. We consider the impact of the conformal
transformation on the gauge of a perturbed system and show that unless the
system is written in a restricted set of gauges the mapping could produce an
inconsistent res... | [
{
"created": "Fri, 2 Dec 2011 21:01:10 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Apr 2012 11:47:31 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Brown",
"Iain A.",
""
],
[
"Hammami",
"Amir",
""
]
] | We consider issues related to the conformal mapping between the Einstein and Jordan frames in f(R) cosmology. We consider the impact of the conformal transformation on the gauge of a perturbed system and show that unless the system is written in a restricted set of gauges the mapping could produce an inconsistent resul... |
2003.02690 | William Barker Mr | W. E. V. Barker, A. N. Lasenby, M. P. Hobson and W. J. Handley | Addressing $H_0$ tension with emergent dark radiation in unitary gravity | 32 pages, 5 figures, 2 tables. Titular change. Updated ref. [85] and
ref. [96]. Version to appear in Phys. Rev. D | Phys. Rev. D 102, 024048 (2020) | 10.1103/PhysRevD.102.024048 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a one-parameter extension to $\Lambda$CDM, expected to strongly
affect cosmological tensions. An effective dark radiation component in the
early universe redshifts away as hot dark matter, then quintessence, tracking
the dominant equation-of-state parameter and leaving a falsifiable torsion
field in the cu... | [
{
"created": "Thu, 5 Mar 2020 14:59:08 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Mar 2020 02:56:10 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Jul 2020 17:49:29 GMT",
"version": "v3"
}
] | 2020-07-22 | [
[
"Barker",
"W. E. V.",
""
],
[
"Lasenby",
"A. N.",
""
],
[
"Hobson",
"M. P.",
""
],
[
"Handley",
"W. J.",
""
]
] | We propose a one-parameter extension to $\Lambda$CDM, expected to strongly affect cosmological tensions. An effective dark radiation component in the early universe redshifts away as hot dark matter, then quintessence, tracking the dominant equation-of-state parameter and leaving a falsifiable torsion field in the curr... |
1905.09476 | Martin Green | M. A. Green and J. W. Moffat | Modified Gravity (MOG) fits to observed radial acceleration of SPARC
galaxies | 11 pages, 11 figures | Physics of the Dark Universe 25 (2019) 100323 | 10.1016/j.dark.2019.100323 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equation of motion in the generally covariant modified gravity (MOG)
theory leads, for weak gravitational fields and non-relativistic motion, to a
modification of Newton's gravitational acceleration law. In addition to the
metric $g_{\mu\nu}$, MOG has a vector field $\phi_\mu$ that couples with
gravitational stre... | [
{
"created": "Tue, 21 May 2019 18:32:08 GMT",
"version": "v1"
}
] | 2019-05-24 | [
[
"Green",
"M. A.",
""
],
[
"Moffat",
"J. W.",
""
]
] | The equation of motion in the generally covariant modified gravity (MOG) theory leads, for weak gravitational fields and non-relativistic motion, to a modification of Newton's gravitational acceleration law. In addition to the metric $g_{\mu\nu}$, MOG has a vector field $\phi_\mu$ that couples with gravitational streng... |
gr-qc/9907025 | Piotr Jaranowski | Piotr Jaranowski and Gerhard Sch\"afer | On bare masses in time-symmetric initial-value solutions for two black
holes | LaTeX, 4 pages | Phys.Rev.D61:064008,2000 | 10.1103/PhysRevD.61.064008 | null | gr-qc | null | The Brill-Lindquist time-symmetric initial-value solution for two uncharged
black holes is rederived using the Hamiltonian constraint equation with Dirac
delta distributions as a source for the binary black-hole field. The bare
masses of the Brill-Lindquist black holes are introduced in a way which is
applied, after ... | [
{
"created": "Tue, 6 Jul 1999 17:43:14 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Jaranowski",
"Piotr",
""
],
[
"Schäfer",
"Gerhard",
""
]
] | The Brill-Lindquist time-symmetric initial-value solution for two uncharged black holes is rederived using the Hamiltonian constraint equation with Dirac delta distributions as a source for the binary black-hole field. The bare masses of the Brill-Lindquist black holes are introduced in a way which is applied, after st... |
gr-qc/9611001 | Gary Gibbons | G W Gibbons | Master Equations and Majorana Spinors | 16 pages plain TEX, no figures to appear in the special issue of
Classical and Quantum Gravity to celebrate the 64th birthday of A Trautmann | Class.Quant.Grav.14:A155-A164,1997 | 10.1088/0264-9381/14/1A/013 | null | gr-qc hep-th | null | I describe how the states of a discrete automata with p sites, each of which
may be off or on, can be represented as Majorana spinors associated to a
spacetime with signature (p,p). Some ideas about the quantization of such
systems are discussed and the relationship to some unconventional formulations
and generalizat... | [
{
"created": "Fri, 1 Nov 1996 15:38:10 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Gibbons",
"G W",
""
]
] | I describe how the states of a discrete automata with p sites, each of which may be off or on, can be represented as Majorana spinors associated to a spacetime with signature (p,p). Some ideas about the quantization of such systems are discussed and the relationship to some unconventional formulations and generalizatio... |
gr-qc/9906027 | null | Parthasarathi Majumdar and Soumitra SenGupta | Parity Violating Gravitational Coupling Of Electromagnetic Fields | 7 Pages, Latex . no figures, Replaced with Revtex version, many
references added and typos corrected | Class.Quant.Grav.16:L89-L94,1999 | 10.1088/0264-9381/16/12/102 | null | gr-qc | null | A manifestly gauge invariant formulation of the coupling of the Maxwell
theory with an Einstein Cartan geometry is given, where the space time torsion
originates from a massless Kalb-Ramond field augmented by suitable U(1) Chern
Simons terms.We focus on the situation where the torsion violates parity, and
relate it t... | [
{
"created": "Mon, 7 Jun 1999 12:20:58 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Jul 1999 11:51:55 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Majumdar",
"Parthasarathi",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | A manifestly gauge invariant formulation of the coupling of the Maxwell theory with an Einstein Cartan geometry is given, where the space time torsion originates from a massless Kalb-Ramond field augmented by suitable U(1) Chern Simons terms.We focus on the situation where the torsion violates parity, and relate it to ... |
gr-qc/9712031 | Mikel Susperregi | Mikel Susperregi (QMW, Univ. of London) | How typical is General Relativity in Brans-Dicke chaotic inflation? | Submitted to Phys Rev D. 24 pages, 3 figures. LaTeX, figures in ps
format | null | null | null | gr-qc | null | General Relativity is recovered from Brans-Dicke gravity in the limit of
large $\omega$. In this article we investigate theories of Brans-Dicke gravity
with chaotic inflation, allowing for either a constant or variable value of
$\omega$, known as extended and hyperextended inflation respectively. The main
focus of th... | [
{
"created": "Fri, 5 Dec 1997 15:36:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Susperregi",
"Mikel",
"",
"QMW, Univ. of London"
]
] | General Relativity is recovered from Brans-Dicke gravity in the limit of large $\omega$. In this article we investigate theories of Brans-Dicke gravity with chaotic inflation, allowing for either a constant or variable value of $\omega$, known as extended and hyperextended inflation respectively. The main focus of the ... |
gr-qc/0211038 | Bijaya Kumar Sahoo | B.K.Sahoo and L.P.Singh | Cosmic Evolution in Generalised Brans-Dicke Theory | 12 pages, no figures | Mod.Phys.Lett. A18 (2003) 2725-2734 | 10.1142/S0217732303012106 | null | gr-qc | null | We have studied the Generalised Brans-Dicke theory and obtained exact
solutions of a(t),phi(t),and omega(t) for different epochs of the cosmic
evolution .We discuss how inflation,decceleration,cosmic acceleration can
result from this solution.The time variation of G(t) is also examined.
| [
{
"created": "Tue, 12 Nov 2002 06:10:51 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Sahoo",
"B. K.",
""
],
[
"Singh",
"L. P.",
""
]
] | We have studied the Generalised Brans-Dicke theory and obtained exact solutions of a(t),phi(t),and omega(t) for different epochs of the cosmic evolution .We discuss how inflation,decceleration,cosmic acceleration can result from this solution.The time variation of G(t) is also examined. |
1510.07836 | Oleg Evnin | Ben Craps and Oleg Evnin | AdS (in)stability: an analytic approach | 14 pages, based in part on an invited talk at the Leuven workshop on
The String Theory Universe, September 7-11, 2015; v2: minor clarifications
and references added | Fortschr. Phys. 64 (2016) 336 | 10.1002/prop.201500067 | null | gr-qc hep-th nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly review the topic of AdS (in)stability, mainly focusing on a
recently introduced analytic approach and its interplay with numerical results.
| [
{
"created": "Tue, 27 Oct 2015 10:03:30 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Nov 2015 02:32:14 GMT",
"version": "v2"
}
] | 2016-04-19 | [
[
"Craps",
"Ben",
""
],
[
"Evnin",
"Oleg",
""
]
] | We briefly review the topic of AdS (in)stability, mainly focusing on a recently introduced analytic approach and its interplay with numerical results. |
1405.2569 | Mustapha Azreg-A\"inou | Mustapha Azreg-A\"inou | Generating rotating regular black hole solutions without
complexification | 12 pages, 4 figures. This is the extended version of the previously
entitled "On `Rotating regular black hole solution': Generating the physical
solution in Boyer-Lindquist coordinates" one. Minor corrections | Phys. Rev. D 90, 064041 (2014) | 10.1103/PhysRevD.90.064041 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We drop the complexification procedure from the Newman-Janis algorithm and
introduce more physical arguments and symmetry properties, and we show how one
can generate regular and singular rotating black hole and non-black-hole
solutions in Boyer-Lindquist coordinates. We focus on generic rotating regular
black holes ... | [
{
"created": "Sun, 11 May 2014 18:57:18 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Sep 2014 06:16:00 GMT",
"version": "v2"
},
{
"created": "Wed, 24 Sep 2014 06:27:31 GMT",
"version": "v3"
}
] | 2014-09-25 | [
[
"Azreg-Aïnou",
"Mustapha",
""
]
] | We drop the complexification procedure from the Newman-Janis algorithm and introduce more physical arguments and symmetry properties, and we show how one can generate regular and singular rotating black hole and non-black-hole solutions in Boyer-Lindquist coordinates. We focus on generic rotating regular black holes an... |
gr-qc/9803015 | Takeshi Chiba | Takeshi Chiba, Kei-ichi Maeda, Ken-ichi Nakao, Taro Tsukamoto | Two Boosted Black Holes in Asymptotically de Sitter Space-Time -
Relation between Mass and Apparent Horizon Formation - | 15 pages, accepted for publication in PRD | Phys.Rev. D57 (1998) 6119-6126 | 10.1103/PhysRevD.57.6119 | YITP-98-7, WU-AP/70/98, KUNS-1490 | gr-qc | null | We study the apparent horizon for two boosted black holes in the
asymptotically de Sitter space-time by solving the initial data on a space with
punctures. We show that the apparent horizon enclosing both black holes is not
formed if the conserved mass of the system (Abbott-Deser mass) is larger than a
critical mass.... | [
{
"created": "Wed, 4 Mar 1998 05:24:17 GMT",
"version": "v1"
}
] | 2019-08-17 | [
[
"Chiba",
"Takeshi",
""
],
[
"Maeda",
"Kei-ichi",
""
],
[
"Nakao",
"Ken-ichi",
""
],
[
"Tsukamoto",
"Taro",
""
]
] | We study the apparent horizon for two boosted black holes in the asymptotically de Sitter space-time by solving the initial data on a space with punctures. We show that the apparent horizon enclosing both black holes is not formed if the conserved mass of the system (Abbott-Deser mass) is larger than a critical mass. T... |
1806.10005 | Dimitris Moustos | Dimitris Moustos | Asymptotic states of accelerated detectors and universality of the Unruh
effect | 18 pages, 2 figures, Updated to match the published version. arXiv
admin note: text overlap with arXiv:1611.02477 | Phys. Rev. D 98, 065006 (2018) | 10.1103/PhysRevD.98.065006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We treat an Unruh-DeWitt detector as an open quantum system and evaluate the
response of a uniformly accelerated detector: (i) interacting locally with the
derivatives of a massless scalar field and (ii) linearly coupled to an
electromagnetic field. We find that the early-time transition rate of the
detector strongly... | [
{
"created": "Mon, 25 Jun 2018 16:31:02 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Sep 2018 16:41:57 GMT",
"version": "v2"
}
] | 2018-09-17 | [
[
"Moustos",
"Dimitris",
""
]
] | We treat an Unruh-DeWitt detector as an open quantum system and evaluate the response of a uniformly accelerated detector: (i) interacting locally with the derivatives of a massless scalar field and (ii) linearly coupled to an electromagnetic field. We find that the early-time transition rate of the detector strongly d... |
1512.05268 | Ali \"Ovg\"un | Ali \"Ovg\"un and Kimet Jusufi | Massive Vector Particles Tunneling From Noncommutative Charged Black
Holes and its GUP-corrected Thermodynamics | 10 pages, to appear in EPJ Plus | Eur. Phys. J. Plus (2016) 131: 177 | 10.1140/epjp/i2016-16177-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the tunneling process of charged massive bosons
$W^{\pm }$ (spin-1 particles) from noncommutative charged black holes such as
charged RN black holes and charged BTZ black holes. By applying the WKB
approximation and by using the Hamilton-Jacobi equation we derive the tunneling
rate and t... | [
{
"created": "Wed, 16 Dec 2015 18:17:07 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2016 13:48:07 GMT",
"version": "v2"
}
] | 2016-05-26 | [
[
"Övgün",
"Ali",
""
],
[
"Jusufi",
"Kimet",
""
]
] | In this paper, we investigate the tunneling process of charged massive bosons $W^{\pm }$ (spin-1 particles) from noncommutative charged black holes such as charged RN black holes and charged BTZ black holes. By applying the WKB approximation and by using the Hamilton-Jacobi equation we derive the tunneling rate and the... |
1406.1105 | Massimo Cerdonio | Massimo Cerdonio and Carlo Rovelli | A Casimir cannot cavity fly | misprints in formulas amended; references added; english refurbished;
no change in substance | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The field inside a Casimir cavity has an effective negative mass, which acts
as a buoyancy force in a gravitational field. Can this render the total mass of
the cavity negative, making it "float" in the vacuum ? Recent theoretical
arguments indicate that this is impossible. We provide support to this
conclusion discu... | [
{
"created": "Wed, 4 Jun 2014 16:46:25 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Aug 2014 07:44:13 GMT",
"version": "v2"
},
{
"created": "Sun, 8 Feb 2015 19:46:48 GMT",
"version": "v3"
}
] | 2015-02-10 | [
[
"Cerdonio",
"Massimo",
""
],
[
"Rovelli",
"Carlo",
""
]
] | The field inside a Casimir cavity has an effective negative mass, which acts as a buoyancy force in a gravitational field. Can this render the total mass of the cavity negative, making it "float" in the vacuum ? Recent theoretical arguments indicate that this is impossible. We provide support to this conclusion discuss... |
1106.5638 | Khedmat Atazadeh | A. H. Ziaie, K. Atazadeh, S. M. M. Rasouli | Naked Singularity Formation In f(R) Gravity | 15 pages, 4 figures, to appear in GRG | Gen Relativ Gravit 43 (2011) 2943 | 10.1007/s10714-011-1216-4 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/3.0/ | We study the gravitational collapse of a star with barotropic equation of
state $p=w\rho$ in the context of $f({\mathcal R})$ theories of gravity.
Utilizing the metric formalism, we rewrite the field equations as those of
Brans-Dicke theory with vanishing coupling parameter. By choosing the
functionality of Ricci sca... | [
{
"created": "Tue, 28 Jun 2011 12:15:41 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Ziaie",
"A. H.",
""
],
[
"Atazadeh",
"K.",
""
],
[
"Rasouli",
"S. M. M.",
""
]
] | We study the gravitational collapse of a star with barotropic equation of state $p=w\rho$ in the context of $f({\mathcal R})$ theories of gravity. Utilizing the metric formalism, we rewrite the field equations as those of Brans-Dicke theory with vanishing coupling parameter. By choosing the functionality of Ricci scala... |
1904.09897 | Shambel Sahlu Akalu | Shambel Sahlu, Joseph Ntahompagaze, Maye Elmardi and Amare Abebe | The Chaplygin gas as a model for modified teleparallel gravity? | null | null | 10.1140/epjc/s10052-019-7226-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper explores the possibility of treating the exotic Chaplygin-gas (CG)
fluid model as some manifestation of an $f(T)$ gravitation. To this end, we use
the different cosmological CG equations of state, compare them with the
equation of state for the modified teleparallel gravity and reconstruct the
correspondin... | [
{
"created": "Mon, 22 Apr 2019 14:31:48 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Sep 2019 06:11:05 GMT",
"version": "v2"
}
] | 2019-10-02 | [
[
"Sahlu",
"Shambel",
""
],
[
"Ntahompagaze",
"Joseph",
""
],
[
"Elmardi",
"Maye",
""
],
[
"Abebe",
"Amare",
""
]
] | This paper explores the possibility of treating the exotic Chaplygin-gas (CG) fluid model as some manifestation of an $f(T)$ gravitation. To this end, we use the different cosmological CG equations of state, compare them with the equation of state for the modified teleparallel gravity and reconstruct the corresponding ... |
1309.2027 | Yuan Zhang | Yuan Zhang, Sijie Gao | Testing cosmic censorship conjecture near extremal black holes with
cosmological constants | 15 pages, 1 figure | Int. J. Mod. Phys. D Vol. 23, No. 5 (2014) 1450044 | 10.1142/S0218271814500448 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown previously that an extremal Reissner-Nordstr\"om or an
extremal Kerr black hole cannot be overcharged or overspun by a test particle
if radiative and self-force effects are neglected. In this paper, we consider
extremal charged and rotating black holes with cosmological constants. By
studying the mo... | [
{
"created": "Mon, 9 Sep 2013 01:50:04 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jan 2014 12:26:04 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Apr 2014 13:21:19 GMT",
"version": "v3"
}
] | 2014-04-02 | [
[
"Zhang",
"Yuan",
""
],
[
"Gao",
"Sijie",
""
]
] | It has been shown previously that an extremal Reissner-Nordstr\"om or an extremal Kerr black hole cannot be overcharged or overspun by a test particle if radiative and self-force effects are neglected. In this paper, we consider extremal charged and rotating black holes with cosmological constants. By studying the moti... |
gr-qc/0702044 | Fotini Markopoulou Kalamara | Fotini Markopoulou and Lee Smolin | Disordered locality in loop quantum gravity states | 11 pages, 4 figures, revision with extended discussion of results | Class.Quant.Grav.24:3813-3824,2007 | 10.1088/0264-9381/24/15/003 | null | gr-qc | null | We show that loop quantum gravity suffers from a potential problem with
non-locality, coming from a mismatch between micro-locality, as defined by the
combinatorial structures of their microscopic states, and macro-locality,
defined by the metric which emerges from the low energy limit. As a result, the
low energy li... | [
{
"created": "Wed, 7 Feb 2007 22:30:02 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Apr 2007 14:05:46 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Markopoulou",
"Fotini",
""
],
[
"Smolin",
"Lee",
""
]
] | We show that loop quantum gravity suffers from a potential problem with non-locality, coming from a mismatch between micro-locality, as defined by the combinatorial structures of their microscopic states, and macro-locality, defined by the metric which emerges from the low energy limit. As a result, the low energy limi... |
gr-qc/9404037 | Hans-Juergen Schmidt | Hans - J\"urgen Schmidt | Why do all the curvature invariants of a gravitational wave vanish ? | 9 pages | G. Sardanashvily (Ed.) New frontiers in gravitation, Hadronic
Press (1996) 337-344 | null | Preprint 94/03 Uni Potsdam, Mathematik | gr-qc | null | We prove the theorem valid for (Pseudo)-Riemannian manifolds $V_n$: "Let $x
\in V_n$ be a fixed point of a homothetic motion which is not an isometry then
all curvature invariants vanish at $x$." and get the Corollary: "All curvature
invariants of the plane wave metric $$ds \sp 2 \quad = \quad 2 \, du \, dv \, +
\, a... | [
{
"created": "Tue, 19 Apr 1994 10:59:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schmidt",
"Hans - Jürgen",
""
]
] | We prove the theorem valid for (Pseudo)-Riemannian manifolds $V_n$: "Let $x \in V_n$ be a fixed point of a homothetic motion which is not an isometry then all curvature invariants vanish at $x$." and get the Corollary: "All curvature invariants of the plane wave metric $$ds \sp 2 \quad = \quad 2 \, du \, dv \, + \, a\s... |
1604.05168 | Nikolaos Dimakis | N. Dimakis, A. Karagiorgos, Adamantia Zampeli, Andronikos
Paliathanasis, T. Christodoulakis and Petros A. Terzis | General Analytic Solutions of Scalar Field Cosmology with Arbitrary
Potential | 24 pages, 3 figures | Phys. Rev. D 93, 123518 (2016) | 10.1103/PhysRevD.93.123518 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the solution space for the case of a minimally coupled scalar
field with arbitrary potential in a FLRW metric. This is made possible due to
the existence of a nonlocal integral of motion corresponding to the conformal
Killing field of the two-dimensional minisuperspace metric. The case for both
spatially f... | [
{
"created": "Mon, 18 Apr 2016 14:09:19 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jun 2016 11:49:01 GMT",
"version": "v2"
}
] | 2016-06-22 | [
[
"Dimakis",
"N.",
""
],
[
"Karagiorgos",
"A.",
""
],
[
"Zampeli",
"Adamantia",
""
],
[
"Paliathanasis",
"Andronikos",
""
],
[
"Christodoulakis",
"T.",
""
],
[
"Terzis",
"Petros A.",
""
]
] | We present the solution space for the case of a minimally coupled scalar field with arbitrary potential in a FLRW metric. This is made possible due to the existence of a nonlocal integral of motion corresponding to the conformal Killing field of the two-dimensional minisuperspace metric. The case for both spatially fla... |
gr-qc/9710113 | Paulo Rodrigues Lima Vargas Moniz | P. V. Moniz (DAMTP, University of Cambridge) | Origin of Structure in a Supersymmetric Quantum Universe | 3 pages, LaTeX, requires mprocl.sty available at
http://shemesh.fiz.huji.ac.il/MG8/submission.html, talk given in the Early
Universe session at the MG8 Conference | Phys.Rev.D57:7071-7074,1998 | 10.1103/PhysRevD.57.7071 | null | gr-qc astro-ph hep-th | null | In this report we advance the current repertoire of quantum cosmological
models to incorporate inhomogenous field modes in a supersymmetric manner. In
particular, we introduce perturbations about a supersymmetric FRW model. A
quantum state of our model has properties typical of the no-boundary
(Hartle--Hawking) propo... | [
{
"created": "Mon, 27 Oct 1997 11:51:24 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Moniz",
"P. V.",
"",
"DAMTP, University of Cambridge"
]
] | In this report we advance the current repertoire of quantum cosmological models to incorporate inhomogenous field modes in a supersymmetric manner. In particular, we introduce perturbations about a supersymmetric FRW model. A quantum state of our model has properties typical of the no-boundary (Hartle--Hawking) proposa... |
2302.12296 | Riccardo Della Monica | Riccardo Della Monica, Ivan de Martino, Mariafelicia de Laurentis | Response to: Comment on "Orbital precession of the S2 star in
scalar-tensor-vector gravity" | 4 pages, 2 figures, 1 appendix. Accepted for publication in MNRAS | null | 10.1093/mnras/stad579 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The explicit derivation for the orbital precession of the S2 star in the
Galactic Center in the Scalar-Tensor-Vector Gravity is discussed and compared
with previous research. The two different predictions are validated by
numerically integrating the geodesic equations for a test particle.
| [
{
"created": "Thu, 23 Feb 2023 19:23:26 GMT",
"version": "v1"
}
] | 2023-02-27 | [
[
"Della Monica",
"Riccardo",
""
],
[
"de Martino",
"Ivan",
""
],
[
"de Laurentis",
"Mariafelicia",
""
]
] | The explicit derivation for the orbital precession of the S2 star in the Galactic Center in the Scalar-Tensor-Vector Gravity is discussed and compared with previous research. The two different predictions are validated by numerically integrating the geodesic equations for a test particle. |
0705.1882 | Shabbir Ghulam | Ghulam Shabbir | Weyl Projective Curvature Symmetry in FRW k=0 Model | 7pages. submitted | null | null | null | gr-qc | null | A study of proper Weyl projective curvature collineations in FRW k=0
space-time is given using the rank of Weyl projective curvature matrix and
direct integration techniques. It is shown that a very special class of the
above space-time admits proper Weyl projective curvature collineation.
| [
{
"created": "Mon, 14 May 2007 07:56:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Shabbir",
"Ghulam",
""
]
] | A study of proper Weyl projective curvature collineations in FRW k=0 space-time is given using the rank of Weyl projective curvature matrix and direct integration techniques. It is shown that a very special class of the above space-time admits proper Weyl projective curvature collineation. |
2001.03768 | Martin Kuchynka | Martin Kuchynka | Einstein-Yang-Mills fields immune to quantum corrections | 6 pages, 0 figures | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Just recently, the class of all Einstein-Maxwell fields solving
simultaneously also any higher-order modification of the Eintein-Maxwell theory
has been completely identified. In the present work, we argue that, in view of
our recent results on nonabelian gauge fields, analogous identification can be
in fact achieved... | [
{
"created": "Sat, 11 Jan 2020 15:56:57 GMT",
"version": "v1"
}
] | 2020-01-14 | [
[
"Kuchynka",
"Martin",
""
]
] | Just recently, the class of all Einstein-Maxwell fields solving simultaneously also any higher-order modification of the Eintein-Maxwell theory has been completely identified. In the present work, we argue that, in view of our recent results on nonabelian gauge fields, analogous identification can be in fact achieved f... |
2207.05076 | Jainendra Kumar Singh Dr. | Shaily, J. K. Singh, Joao R. L. Santos, M. Zeyauddin | Dynamical analysis of a hyperbolic solution in Scale-covariant theory | 20 pages, 19 figures | International Journal of Modern Physics D, 2024 | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study an isotropic flat FLRW-model in Scale-covariant theory of gravity $
f_{\gamma \delta}(\phi) $ \cite{Canuto:1977zz} which is explained in terms of
ordinary and covariant differentiation of scalar field $ \phi $. As we know the
deceleration parameter is time-dependent, so we consider the deceleration
parameter... | [
{
"created": "Mon, 11 Jul 2022 12:17:52 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Apr 2024 03:20:17 GMT",
"version": "v2"
}
] | 2024-05-01 | [
[
"Shaily",
"",
""
],
[
"Singh",
"J. K.",
""
],
[
"Santos",
"Joao R. L.",
""
],
[
"Zeyauddin",
"M.",
""
]
] | We study an isotropic flat FLRW-model in Scale-covariant theory of gravity $ f_{\gamma \delta}(\phi) $ \cite{Canuto:1977zz} which is explained in terms of ordinary and covariant differentiation of scalar field $ \phi $. As we know the deceleration parameter is time-dependent, so we consider the deceleration parameter $... |
1909.04155 | Alexander B. Balakin | Alexander B. Balakin and Dmitry E. Groshev | Magneto-electro-statics of axionically active systems: Induced field
restructuring in magnetic stars | 13 pages, 4 figures; replaced with the revised version published in
Phys.Rev.D | Phys. Rev. D 101, 023009 (2020) | 10.1103/PhysRevD.101.023009 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of Einstein-Maxwell-axion theory we consider a static field
configuration in the outer zone of a magnetic star. We assume that this field
configuration is formed by the following interacting quartet: a spherically
symmetric gravitational field of the Reissner-Nordstr\"om type, pseudoscalar
field, ass... | [
{
"created": "Mon, 9 Sep 2019 21:00:10 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jan 2020 14:23:33 GMT",
"version": "v2"
}
] | 2020-01-27 | [
[
"Balakin",
"Alexander B.",
""
],
[
"Groshev",
"Dmitry E.",
""
]
] | In the framework of Einstein-Maxwell-axion theory we consider a static field configuration in the outer zone of a magnetic star. We assume that this field configuration is formed by the following interacting quartet: a spherically symmetric gravitational field of the Reissner-Nordstr\"om type, pseudoscalar field, assoc... |
2007.12023 | Bahram Mashhoon | Bahram Mashhoon | Critical Tidal Currents in General Relativity | 26 pages; v2: minor improvements, invited contribution to appear in
Universe; v3: two errant numerical coefficients in equation (15) corrected.
These errors propagated to Section IV; hence, equations (35), (38), (40),
(43), (44), (46), (47), (61) and (62) have also been corrected, main results
and conclusions r... | Universe 6, 104 (2020) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Relativistic tidal equations are formulated with respect to the rest frame of
a central gravitational source and their solutions are studied. The existence
of certain relativistic critical tidal currents are thereby elucidated.
Specifically, observers that are spatially at rest in the exterior Kerr
spacetime are cons... | [
{
"created": "Thu, 23 Jul 2020 14:05:23 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jul 2020 11:10:48 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Oct 2020 09:20:55 GMT",
"version": "v3"
}
] | 2020-10-13 | [
[
"Mashhoon",
"Bahram",
""
]
] | Relativistic tidal equations are formulated with respect to the rest frame of a central gravitational source and their solutions are studied. The existence of certain relativistic critical tidal currents are thereby elucidated. Specifically, observers that are spatially at rest in the exterior Kerr spacetime are consid... |
0710.2333 | Kumar Virbhadra | K. S. Virbhadra and C. R. Keeton | Time delay and magnification centroid due to gravitational lensing by
black holes and naked singularities | RevTex, 14 pages, 5 figures | Phys.Rev.D77:124014,2008 | 10.1103/PhysRevD.77.124014 | null | gr-qc astro-ph hep-th physics.class-ph | null | We model the massive dark object at the center of the Galaxy as a
Schwarzschild black hole as well as Janis-Newman-Winicour naked singularities,
characterized by the mass and scalar charge parameters, and study gravitational
lensing (particularly time delay, magnification centroid, and total
magnification) by them. W... | [
{
"created": "Thu, 11 Oct 2007 19:28:32 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Virbhadra",
"K. S.",
""
],
[
"Keeton",
"C. R.",
""
]
] | We model the massive dark object at the center of the Galaxy as a Schwarzschild black hole as well as Janis-Newman-Winicour naked singularities, characterized by the mass and scalar charge parameters, and study gravitational lensing (particularly time delay, magnification centroid, and total magnification) by them. We ... |
2402.00081 | Lu\'is Filipe Costa | L. Filipe O. Costa, F. Frutos-Alfaro, Jos\'e Nat\'ario, Michael Soffel | Comment on "The Tully-Fisher law and dark matter effects derived via
modified symmetries" by Arraut Ivan | 2 pages, no figures. Two minor typos in the text corrected, matches
the final published version | EPL 146 (2024) 19002 | 10.1209/0295-5075/ad2728 | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been claimed in I. Arraut, 2023 EPL 144 29003 [arXiv:2311.05652] that
General Relativity can generate effects equivalent to dark matter, based on a
"new modified symmetry that emerges at galactic scale". We show that (i) the
spacetime considered is unphysical, violating energy conditions everywhere;
(ii) actua... | [
{
"created": "Wed, 31 Jan 2024 04:22:29 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Apr 2024 09:52:41 GMT",
"version": "v2"
}
] | 2024-04-05 | [
[
"Costa",
"L. Filipe O.",
""
],
[
"Frutos-Alfaro",
"F.",
""
],
[
"Natário",
"José",
""
],
[
"Soffel",
"Michael",
""
]
] | It has been claimed in I. Arraut, 2023 EPL 144 29003 [arXiv:2311.05652] that General Relativity can generate effects equivalent to dark matter, based on a "new modified symmetry that emerges at galactic scale". We show that (i) the spacetime considered is unphysical, violating energy conditions everywhere; (ii) actuall... |
2204.07589 | Baofei Li | Bao-Fei Li and Parampreet Singh | Loop quantum cosmology and its gauge-covariant avatar: a weak curvature
relationship | 14 pages | null | 10.1103/PhysRevD.106.026009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the relationship between the effective dynamics in standard loop
quantum cosmology (LQC) based on holonomies and triads obtained from
gauge-fixing fluxes, and a modification of LQC based on holonomies and
gauge-covariant fluxes (referred to as gLQC). Both the models yield singularity
resolution via a bounc... | [
{
"created": "Fri, 15 Apr 2022 18:00:04 GMT",
"version": "v1"
}
] | 2022-08-31 | [
[
"Li",
"Bao-Fei",
""
],
[
"Singh",
"Parampreet",
""
]
] | We explore the relationship between the effective dynamics in standard loop quantum cosmology (LQC) based on holonomies and triads obtained from gauge-fixing fluxes, and a modification of LQC based on holonomies and gauge-covariant fluxes (referred to as gLQC). Both the models yield singularity resolution via a bounce ... |
0806.3602 | Hongwei Yu | Hongwei Yu, Jianlin Zhang | Understanding Hawking radiation in the framework of open quantum systems | 15 pages, no figures, Revtex4 | Phys.Rev.D77:024031,2008; Erratum-ibid.D77:029904,2008 | 10.1103/PhysRevD.77.024031 10.1103/PhysRevD.77.029904 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Hawking radiation in the framework of open quantum systems by
examining the time evolution of a detector (modelled by a two-level atom)
interacting with vacuum massless scalar fields. The dynamics of the detector is
governed by a master equation obtained by tracing over the field degrees of
freedom from ... | [
{
"created": "Mon, 23 Jun 2008 02:05:16 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Yu",
"Hongwei",
""
],
[
"Zhang",
"Jianlin",
""
]
] | We study the Hawking radiation in the framework of open quantum systems by examining the time evolution of a detector (modelled by a two-level atom) interacting with vacuum massless scalar fields. The dynamics of the detector is governed by a master equation obtained by tracing over the field degrees of freedom from th... |
2308.01190 | Arif Mohd | Musfar Muhamed Kozhikkal, Arif Mohd | Bogoliubov Transformation and Schrodinger Representation on Curved Space | 15 pages | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | It is usually accepted that quantum dynamics described by Schrodinger
equation that determines the evolution of states from one Cauchy surface to
another is unitary. However, it has been known for some time that this
expectation is not borne out in the conventional setting in which one envisages
the dynamics on a fix... | [
{
"created": "Wed, 2 Aug 2023 14:55:31 GMT",
"version": "v1"
}
] | 2023-08-03 | [
[
"Kozhikkal",
"Musfar Muhamed",
""
],
[
"Mohd",
"Arif",
""
]
] | It is usually accepted that quantum dynamics described by Schrodinger equation that determines the evolution of states from one Cauchy surface to another is unitary. However, it has been known for some time that this expectation is not borne out in the conventional setting in which one envisages the dynamics on a fixed... |
1605.06316 | Andre Maeder | Andre Maeder | Scale invariant cosmology II: model equations and properties | 8 pages, no figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We want to establish the basic properties of a scale invariant cosmology,
that also accounts for the hypothesis of scale invariance of the empty space at
large scales. We write the basic analytical properties of the scale invariant
cosmological models. The hypothesis of scale invariance of the empty space at
large sc... | [
{
"created": "Thu, 19 May 2016 07:08:42 GMT",
"version": "v1"
}
] | 2016-05-25 | [
[
"Maeder",
"Andre",
""
]
] | We want to establish the basic properties of a scale invariant cosmology, that also accounts for the hypothesis of scale invariance of the empty space at large scales. We write the basic analytical properties of the scale invariant cosmological models. The hypothesis of scale invariance of the empty space at large scal... |
2108.00838 | Peter Horvathy | P-M. Zhang, M. Elbistan, P. A. Horvathy | Particle motion in circularly polarized vacuum pp waves | 22 pages many figures. Thoroughly revised and extended version with a
modified title | null | 10.1088/1361-6382/ac43d2 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bialynicki-Birula and Charzynski argued that a gravitational wave emitted
during the merger of a black hole binary may be approximated by a circularly
polarized wave
which may in turn trap particles [1]. In this paper we consider particle
motion in a class of gravitational waves which includes, besides circularly
p... | [
{
"created": "Mon, 2 Aug 2021 12:50:20 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Nov 2021 12:49:43 GMT",
"version": "v2"
}
] | 2022-02-02 | [
[
"Zhang",
"P-M.",
""
],
[
"Elbistan",
"M.",
""
],
[
"Horvathy",
"P. A.",
""
]
] | Bialynicki-Birula and Charzynski argued that a gravitational wave emitted during the merger of a black hole binary may be approximated by a circularly polarized wave which may in turn trap particles [1]. In this paper we consider particle motion in a class of gravitational waves which includes, besides circularly polar... |
2304.14187 | Vincent Comeau | Vincent Comeau | Perturbative Correction to the Average Expansion Rate of Spacetimes with
Perfect Fluids | null | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper discusses the leading-order correction induced by cosmological
perturbations on the average expansion rate of an expanding spacetime,
containing one or many perfect fluids. The calculation is carried out up to the
second order in the perturbations, and is kept as general as possible. In
particular, no appr... | [
{
"created": "Thu, 27 Apr 2023 13:46:49 GMT",
"version": "v1"
}
] | 2023-04-28 | [
[
"Comeau",
"Vincent",
""
]
] | This paper discusses the leading-order correction induced by cosmological perturbations on the average expansion rate of an expanding spacetime, containing one or many perfect fluids. The calculation is carried out up to the second order in the perturbations, and is kept as general as possible. In particular, no approx... |
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