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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2208.02557 | Leonardo Modesto | Tian Zhou, Leonardo Modesto | Geodesic incompleteness of some popular regular black holes | New version widely extended in accordance with the correct and
stimulating suggestions of the referee. This version is conform to the one
published on PRD. 8 pages, 9 figures | null | 10.1103/PhysRevD.107.044016 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Throughout the study of the geodesics of some popular spherically symmetric
regular black holes, we hereby prove that the analytically extended Hayward
black hole is geodetically incomplete. The simplest extension of the
Culetu-Simpson-Visser's non-analytic smooth black hole is also geodetically
incomplete, with the ... | [
{
"created": "Thu, 4 Aug 2022 09:56:42 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Mar 2023 09:09:43 GMT",
"version": "v2"
}
] | 2023-03-24 | [
[
"Zhou",
"Tian",
""
],
[
"Modesto",
"Leonardo",
""
]
] | Throughout the study of the geodesics of some popular spherically symmetric regular black holes, we hereby prove that the analytically extended Hayward black hole is geodetically incomplete. The simplest extension of the Culetu-Simpson-Visser's non-analytic smooth black hole is also geodetically incomplete, with the ex... |
1408.1444 | Gabor Kunstatter | Tim Taves, Gabor Kunstatter | Modelling the Evaporation of Non-singular Black Holes | 14 pages, 0 figures, references and acknowledgements added, final
version to appear in PRD | PhysRevD.90.124062, 2014 | 10.1103/PhysRevD.90.124062 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a model for studying the formation and evaporation of non-singular
(quantum corrected) black holes. The model is based on a generalized form of
the dimensionally reduced, spherically symmetric Einstein--Hilbert action and
includes a suitably generalized Polyakov action to provide a mechanism for
radiation ... | [
{
"created": "Thu, 7 Aug 2014 00:23:31 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Aug 2014 12:44:13 GMT",
"version": "v2"
},
{
"created": "Sun, 11 Jan 2015 17:14:42 GMT",
"version": "v3"
}
] | 2015-06-22 | [
[
"Taves",
"Tim",
""
],
[
"Kunstatter",
"Gabor",
""
]
] | We present a model for studying the formation and evaporation of non-singular (quantum corrected) black holes. The model is based on a generalized form of the dimensionally reduced, spherically symmetric Einstein--Hilbert action and includes a suitably generalized Polyakov action to provide a mechanism for radiation ba... |
1807.00812 | Ayan Banerjee | Sudan Hansraj and Ayan Banerjee | Equilibrium stellar configurations in Rastall theory and linear equation
of state | 9 pages and 2 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Amongst a number of modified theories of gravity, the Rastall theory has been
propounded to address some shortcomings of the standard theory of general
relativity. Our purpose is to investigate this framework's capacity to analyse
stellar structure in the context of elementary requirements for physical
plausibility s... | [
{
"created": "Sun, 1 Jul 2018 16:11:37 GMT",
"version": "v1"
}
] | 2018-07-04 | [
[
"Hansraj",
"Sudan",
""
],
[
"Banerjee",
"Ayan",
""
]
] | Amongst a number of modified theories of gravity, the Rastall theory has been propounded to address some shortcomings of the standard theory of general relativity. Our purpose is to investigate this framework's capacity to analyse stellar structure in the context of elementary requirements for physical plausibility suc... |
1803.02779 | Celia Escamilla-Rivera | Celia Escamilla-Rivera | Fluctuations of gravitational waves in Eddington inspired Born-Infeld
theory | 6 pages, 5 figures, under review | Revista Digital Congreso Mesoamericano de Investigacion UNACH
2018. ISSN 2395-8111 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we review the EiBI gravity in the presence of a cosmological
constant and its tensor perturbations analysis. We show the existence of
gravitational waves in the past-time, seeing as a result the smooth transition
between high-energy densities (where the EBI dynamics plays its role) and
low-energy densit... | [
{
"created": "Wed, 7 Mar 2018 17:26:12 GMT",
"version": "v1"
}
] | 2019-01-23 | [
[
"Escamilla-Rivera",
"Celia",
""
]
] | In this paper we review the EiBI gravity in the presence of a cosmological constant and its tensor perturbations analysis. We show the existence of gravitational waves in the past-time, seeing as a result the smooth transition between high-energy densities (where the EBI dynamics plays its role) and low-energy densitie... |
1907.01580 | Vincent Deledicque | Vincent Deledicque | Dark energy explained by an inadequate fitting of the FLRW metric | 12 pages, 1 figure | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Approximating a real manifold by an idealized one requires to calibrate the
parameters characterizing the idealized manifold in function of the real one.
This calibration is a purely conventional process and can generally be done in
several ways, leading to different fittings. In practice, however, all possible
fitti... | [
{
"created": "Tue, 2 Jul 2019 18:30:58 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Apr 2020 18:44:34 GMT",
"version": "v2"
}
] | 2020-04-06 | [
[
"Deledicque",
"Vincent",
""
]
] | Approximating a real manifold by an idealized one requires to calibrate the parameters characterizing the idealized manifold in function of the real one. This calibration is a purely conventional process and can generally be done in several ways, leading to different fittings. In practice, however, all possible fitting... |
1702.00983 | Luis Herrera | L. Herrera, A. Di Prisco, J. Ospino | The transition of a gravitationally radiating, dissipative fluid, to
equilibrium | 7 pages, latex. arXiv admin note: substantial text overlap with
arXiv:1609.02841. Some typos corrected. Published in Canadian Journal of
Physics | Can. J. Phys. 96, 1010-1015 (2018) | 10.1139/cjp-2017-0651 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe the transition of a graviationally radiating, axially and
reflection symmetric dissipative fluid, to a non--radiating state. It is shown
that very shortly after the end of the radiating regime, at a time scale of the
order the thermal relaxation time, the thermal adjustment time and the
hydrostatic time (... | [
{
"created": "Fri, 3 Feb 2017 12:14:55 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Aug 2018 14:23:30 GMT",
"version": "v2"
}
] | 2018-10-17 | [
[
"Herrera",
"L.",
""
],
[
"Di Prisco",
"A.",
""
],
[
"Ospino",
"J.",
""
]
] | We describe the transition of a graviationally radiating, axially and reflection symmetric dissipative fluid, to a non--radiating state. It is shown that very shortly after the end of the radiating regime, at a time scale of the order the thermal relaxation time, the thermal adjustment time and the hydrostatic time (wh... |
1402.0101 | Maurizio Gasperini | M. Gasperini | String theory and primordial cosmology | 17 pages, 5 figures, published in "Springer Handbook of Spacetime",
ed. by A. Ashtekar and V. Petkov (Springer-Verlag, Berlin Heidelberg, 2014,
Chapter 35 | null | 10.1007/978-3-642-41992-8_35 | BA-TH/685-14 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | String cosmology aims at providing a reliable description of the very early
Universe in the regime where standard-model physics is no longer appropriate,
and where we can safely apply the basic ingredients of superstring models such
as dilatonic and axionic forces, duality symmetries, winding modes, limiting
sizes an... | [
{
"created": "Sat, 1 Feb 2014 16:48:51 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Apr 2014 12:16:37 GMT",
"version": "v2"
}
] | 2014-04-24 | [
[
"Gasperini",
"M.",
""
]
] | String cosmology aims at providing a reliable description of the very early Universe in the regime where standard-model physics is no longer appropriate, and where we can safely apply the basic ingredients of superstring models such as dilatonic and axionic forces, duality symmetries, winding modes, limiting sizes and ... |
0708.4299 | Marcello Ortaggio | Marcello Ortaggio, Jiri Podolsky, Martin Zofka | Robinson-Trautman spacetimes with an electromagnetic field in higher
dimensions | 17 pages | Class.Quant.Grav.25:025006,2008 | 10.1088/0264-9381/25/2/025006 | null | gr-qc hep-th | null | We investigate higher dimensional Robinson-Trautman spacetimes with an
electromagnetic field aligned with the hypersurface orthogonal, non-shearing,
expanding geodesic null congruence. After integrating the system of
Einstein-Maxwell equations with an arbitrary cosmological constant, we present
the complete family of... | [
{
"created": "Fri, 31 Aug 2007 08:48:20 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Ortaggio",
"Marcello",
""
],
[
"Podolsky",
"Jiri",
""
],
[
"Zofka",
"Martin",
""
]
] | We investigate higher dimensional Robinson-Trautman spacetimes with an electromagnetic field aligned with the hypersurface orthogonal, non-shearing, expanding geodesic null congruence. After integrating the system of Einstein-Maxwell equations with an arbitrary cosmological constant, we present the complete family of s... |
gr-qc/0312023 | Tran | Rajat K. Bhaduri, Muoi N. Tran, Saurya Das | On the Microcanonical Entropy of a Black Hole | 15 pages, 1 figure | Phys.Rev. D69 (2004) 104018 | 10.1103/PhysRevD.69.104018 | null | gr-qc cond-mat.stat-mech hep-th | null | It has been suggested recently that the microcanonical entropy of a system
may be accurately reproduced by including a logarithmic correction to the
canonical entropy. In this paper we test this claim both analytically and
numerically by considering three simple thermodynamic models whose energy
spectrum may be defin... | [
{
"created": "Wed, 3 Dec 2003 19:13:14 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bhaduri",
"Rajat K.",
""
],
[
"Tran",
"Muoi N.",
""
],
[
"Das",
"Saurya",
""
]
] | It has been suggested recently that the microcanonical entropy of a system may be accurately reproduced by including a logarithmic correction to the canonical entropy. In this paper we test this claim both analytically and numerically by considering three simple thermodynamic models whose energy spectrum may be defined... |
gr-qc/0703058 | Jian-Yang Zhu | Cheng-Zhou Liu, Jian-Yang Zhu | Asymptotic quasinormal modes of scalar field in a gravity's rainbow | null | Chin.Phys.B18:4161-4168,2009 | 10.1088/1674-1056/18/10/015 | null | gr-qc | null | In the context of a gravity's rainbow, the asymptotic quasinormal modes of
the scalar perturbation in the quantum modified Schwarzschild black holes are
investigated. By using the monodromy method, we calculated and obtained the
asymptotic quasinormal frequencies, which are dominated not only by the mass
parameter of... | [
{
"created": "Thu, 8 Mar 2007 13:39:42 GMT",
"version": "v1"
}
] | 2010-11-02 | [
[
"Liu",
"Cheng-Zhou",
""
],
[
"Zhu",
"Jian-Yang",
""
]
] | In the context of a gravity's rainbow, the asymptotic quasinormal modes of the scalar perturbation in the quantum modified Schwarzschild black holes are investigated. By using the monodromy method, we calculated and obtained the asymptotic quasinormal frequencies, which are dominated not only by the mass parameter of t... |
0911.4180 | Hanno Sahlmann | Hanno Sahlmann | Wave propagation on a random lattice | 13 pages, 3 figures. v3: Some minor changes and clarifications.
Virtually identical with the version published in Physical Review D | Phys.Rev.D82:064018,2010 | 10.1103/PhysRevD.82.064018 | KA-TP-18-2009 | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by phenomenological questions in quantum gravity, we consider the
propagation of a scalar field on a random lattice. We describe a procedure to
calculate the dispersion relation for the field by taking a limit of a periodic
lattice. We use this to calculate the lowest order coefficients of the
dispersion re... | [
{
"created": "Mon, 23 Nov 2009 13:37:35 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Dec 2009 19:55:37 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Sep 2010 14:56:46 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Sahlmann",
"Hanno",
""
]
] | Motivated by phenomenological questions in quantum gravity, we consider the propagation of a scalar field on a random lattice. We describe a procedure to calculate the dispersion relation for the field by taking a limit of a periodic lattice. We use this to calculate the lowest order coefficients of the dispersion rela... |
gr-qc/0105027 | Ibrahim Arbab Arbab | Arbab I. Arbab | Cosmological Models With Variable G an Lambda and Bulk viscosity | Ph.D. Thesis(University of Khartoum) | Hadronic Journal Vol. 34, 1 (2011) | null | null | gr-qc | null | We have analyzed a nonsingular model with a variable cosmological term
following the Carvalho {\it et al}. ansatz. The model was shown to approximate
to the model of Freese {\it et al}. in one direction and to the \"{O}zer-Taha
in the other. We have then included the effect of viscosity in this cosmology,
as this eff... | [
{
"created": "Tue, 8 May 2001 09:54:28 GMT",
"version": "v1"
}
] | 2017-06-15 | [
[
"Arbab",
"Arbab I.",
""
]
] | We have analyzed a nonsingular model with a variable cosmological term following the Carvalho {\it et al}. ansatz. The model was shown to approximate to the model of Freese {\it et al}. in one direction and to the \"{O}zer-Taha in the other. We have then included the effect of viscosity in this cosmology, as this effec... |
gr-qc/9907026 | null | Pedro F. Gonzalez-Diaz (IMAFF, CSIC, Madrid) | On the warp drive space-time | 7 pages, minor comment on chronology protection added, RevTex, to
appear in Phys. Rev. D | Phys.Rev. D62 (2000) 044005 | 10.1103/PhysRevD.62.044005 | IMAFF-RCA-99-04 | gr-qc | null | In this paper the problem of the quantum stability of the two-dimensional
warp drive spacetime moving with an apparent faster than light velocity is
considered. We regard as a maximum extension beyond the event horizon of that
spacetime its embedding in a three-dimensional Minkowskian space with the
topology of the c... | [
{
"created": "Wed, 7 Jul 1999 08:47:19 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Apr 2000 18:25:29 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Gonzalez-Diaz",
"Pedro F.",
"",
"IMAFF, CSIC, Madrid"
]
] | In this paper the problem of the quantum stability of the two-dimensional warp drive spacetime moving with an apparent faster than light velocity is considered. We regard as a maximum extension beyond the event horizon of that spacetime its embedding in a three-dimensional Minkowskian space with the topology of the cor... |
0805.0846 | Llu\'is Bel | Ll. Bel | Connecting connections | 17 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As true as it is that a bricklayer needs a plumb line and a T-square, so it
is that a physicist using general relativity needs how to draw geodesics and
use fields of congruent vector frames of reference. While the first part of the
preceding statement depends on the Christoffel connection and related metric
and curv... | [
{
"created": "Wed, 7 May 2008 10:31:02 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jun 2008 07:25:36 GMT",
"version": "v2"
}
] | 2008-06-10 | [
[
"Bel",
"Ll.",
""
]
] | As true as it is that a bricklayer needs a plumb line and a T-square, so it is that a physicist using general relativity needs how to draw geodesics and use fields of congruent vector frames of reference. While the first part of the preceding statement depends on the Christoffel connection and related metric and curvat... |
gr-qc/9803069 | Raul Vera | Jos\'e M. M. Senovilla and Ra\"ul Vera | G_2 cosmological models separable in non-comoving coordinates | latex, 26 pages, accepted for publication in Class. Quantum Grav | Class.Quant.Grav. 15 (1998) 1737-1758 | 10.1088/0264-9381/15/6/022 | null | gr-qc | null | We study new separable orthogonally transitive abelian G_2 on S_2 models with
two mutually orthogonal integrable Killing vector fields. For this purpose we
consider separability of the metric functions in a coordinate system in which
the velocity vector field of the perfect fluid does not take its canonical
form, pro... | [
{
"created": "Thu, 19 Mar 1998 11:33:35 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Senovilla",
"José M. M.",
""
],
[
"Vera",
"Raül",
""
]
] | We study new separable orthogonally transitive abelian G_2 on S_2 models with two mutually orthogonal integrable Killing vector fields. For this purpose we consider separability of the metric functions in a coordinate system in which the velocity vector field of the perfect fluid does not take its canonical form, provi... |
1506.08496 | Achilleas Porfyriadis | Samuel E. Gralla, Achilleas P. Porfyriadis, Niels Warburton | Particle on the Innermost Stable Circular Orbit of a Rapidly Spinning
Black Hole | 15 pages, 4 figures, v2: reference added, minor changes, matches
published version | Phys. Rev. D 92, 064029 (2015) | 10.1103/PhysRevD.92.064029 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the radiation emitted by a particle on the innermost stable
circular orbit of a rapidly spinning black hole both (a) analytically, working
to leading order in the deviation from extremality and (b) numerically, with a
new high-precision Teukolsky code. We find excellent agreement between the two
methods. W... | [
{
"created": "Mon, 29 Jun 2015 03:13:41 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Sep 2015 03:46:10 GMT",
"version": "v2"
}
] | 2015-09-30 | [
[
"Gralla",
"Samuel E.",
""
],
[
"Porfyriadis",
"Achilleas P.",
""
],
[
"Warburton",
"Niels",
""
]
] | We compute the radiation emitted by a particle on the innermost stable circular orbit of a rapidly spinning black hole both (a) analytically, working to leading order in the deviation from extremality and (b) numerically, with a new high-precision Teukolsky code. We find excellent agreement between the two methods. We ... |
1612.06939 | Zhi-Chao Zhao | Zhe Chang, Chao-Guang Huang, Zhi-Chao Zhao | Motion of photons in a background of gravitational wave | 15 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The photon motion in a Michelson interferometer is re-analyzed in both
geometrical optics and wave optics. The classical paths of the photons in the
background of gravitational wave are derived from Fermat principle, which is
the same as the null geodesics in general relativity. The deformed Maxwell
equations and the... | [
{
"created": "Wed, 21 Dec 2016 01:29:49 GMT",
"version": "v1"
}
] | 2016-12-22 | [
[
"Chang",
"Zhe",
""
],
[
"Huang",
"Chao-Guang",
""
],
[
"Zhao",
"Zhi-Chao",
""
]
] | The photon motion in a Michelson interferometer is re-analyzed in both geometrical optics and wave optics. The classical paths of the photons in the background of gravitational wave are derived from Fermat principle, which is the same as the null geodesics in general relativity. The deformed Maxwell equations and the w... |
gr-qc/0410141 | Laurent Freidel | Laurent Freidel and David Louapre | Ponzano-Regge model revisited II: Equivalence with Chern-Simons | 27 + 23 pages, many figures | null | null | null | gr-qc hep-th math.QA | null | We provide a mathematical definition of the gauge fixed Ponzano-Regge model
showing that it gives a measure on the space of flat connections whose volume
is well defined. We then show that the Ponzano-Regge model can be equivalently
expressed as Reshetikhin-Turaev evaluation of a colored chain mail link based
on D(SU... | [
{
"created": "Thu, 28 Oct 2004 14:12:36 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Feb 2005 17:47:39 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Feb 2005 14:25:21 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Freidel",
"Laurent",
""
],
[
"Louapre",
"David",
""
]
] | We provide a mathematical definition of the gauge fixed Ponzano-Regge model showing that it gives a measure on the space of flat connections whose volume is well defined. We then show that the Ponzano-Regge model can be equivalently expressed as Reshetikhin-Turaev evaluation of a colored chain mail link based on D(SU(2... |
1810.07100 | Jakub Mielczarek Ph.D. | Jakub Mielczarek | Spin Foam Vertex Amplitudes on Quantum Computer -- Preliminary Results | 35 pages, 9 figures, improved discussion, additional simulations and
2 appendices added | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vertex amplitudes are elementary contributions to the transition amplitudes
in the spin foam models of quantum gravity. The purpose of this article is make
the first step towards computing vertex amplitudes with the use of quantum
algorithms. In our studies we are focused on a vertex amplitude of 3+1 D
gravity, assoc... | [
{
"created": "Tue, 16 Oct 2018 15:58:41 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jun 2019 22:59:15 GMT",
"version": "v2"
}
] | 2019-06-20 | [
[
"Mielczarek",
"Jakub",
""
]
] | Vertex amplitudes are elementary contributions to the transition amplitudes in the spin foam models of quantum gravity. The purpose of this article is make the first step towards computing vertex amplitudes with the use of quantum algorithms. In our studies we are focused on a vertex amplitude of 3+1 D gravity, associa... |
0906.0436 | Kamal Nandi | Kamal K. Nandi and Anwarul Islam | Brans wormholes | Uploaded for the use of researchers | Phys.Rev.D55:2497-2500,1997 | 10.1103/PhysRevD.55.2497 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that three of the four Brans solutions of classes I--IV admit
wormhole geometry. Two-way traversable wormholes in the Brans-Dicke theory are
allowed not only for the negative values of the coupling parameter w (w<-2), as
concluded earlier, but also for arbitrary positive values of w (w<infinity). It
also ... | [
{
"created": "Tue, 2 Jun 2009 07:47:53 GMT",
"version": "v1"
}
] | 2009-06-30 | [
[
"Nandi",
"Kamal K.",
""
],
[
"Islam",
"Anwarul",
""
]
] | It is shown that three of the four Brans solutions of classes I--IV admit wormhole geometry. Two-way traversable wormholes in the Brans-Dicke theory are allowed not only for the negative values of the coupling parameter w (w<-2), as concluded earlier, but also for arbitrary positive values of w (w<infinity). It also fo... |
gr-qc/0310098 | Sachiko Ogushi | Nathalie Deruelle, Joseph Katz, Sachiko Ogushi | Conserved Charges in Einstein Gauss-Bonnet theory | 17 pages, LaTeX, references added, typos corrected, version to appear
in Class. Quant. Grav | Class.Quant.Grav.21:1971,2004 | 10.1088/0264-9381/21/8/004 | YITP-03-67 | gr-qc hep-th | null | Using Noether's identities, we define a superpotential with respect to a
background for the Einstein Gauss-Bonnet theory of gravity. As an example, we
show that its associated conserved charge yields the mass-energy of a
D-dimensional Gauss-Bonnet black hole in an anti-de Sitter spacetime.
| [
{
"created": "Mon, 20 Oct 2003 07:08:44 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Feb 2004 01:00:12 GMT",
"version": "v2"
}
] | 2010-12-03 | [
[
"Deruelle",
"Nathalie",
""
],
[
"Katz",
"Joseph",
""
],
[
"Ogushi",
"Sachiko",
""
]
] | Using Noether's identities, we define a superpotential with respect to a background for the Einstein Gauss-Bonnet theory of gravity. As an example, we show that its associated conserved charge yields the mass-energy of a D-dimensional Gauss-Bonnet black hole in an anti-de Sitter spacetime. |
gr-qc/0002021 | Ulf Nilsson | U. S. Nilsson and C. Uggla | General Relativistic Stars: Linear Equations of State | 17 pages, 3 figures, uses ajour.cls | Annals Phys. 286 (2001) 278-291 | 10.1006/aphy.2000.6089 | null | gr-qc | null | In this paper Einstein's field equations, for static spherically symmetric
perfect fluid models with a linear barotropic equation of state, are recast
into a 3-dimensional regular system of ordinary differential equations on a
compact state space. The system is analyzed qualitatively, using the theory of
dynamical sy... | [
{
"created": "Fri, 4 Feb 2000 12:24:09 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Nilsson",
"U. S.",
""
],
[
"Uggla",
"C.",
""
]
] | In this paper Einstein's field equations, for static spherically symmetric perfect fluid models with a linear barotropic equation of state, are recast into a 3-dimensional regular system of ordinary differential equations on a compact state space. The system is analyzed qualitatively, using the theory of dynamical syst... |
2406.02639 | Moli Ghosh | Moli Ghosh, Prabir Rudra, Surajit Chattopadhyay | Warm Inflation with Barrow Holographic Dark Energy | 15 pages, 8 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the warm inflation mechanism in the presence of the
Barrow holographic dark energy model. Warm inflation differs from other forms
of inflation primarily in that it makes the assumption that radiation and
inflaton exist and interact throughout the inflationary process. After the
warming process,... | [
{
"created": "Tue, 4 Jun 2024 09:15:32 GMT",
"version": "v1"
}
] | 2024-06-06 | [
[
"Ghosh",
"Moli",
""
],
[
"Rudra",
"Prabir",
""
],
[
"Chattopadhyay",
"Surajit",
""
]
] | In this work, we study the warm inflation mechanism in the presence of the Barrow holographic dark energy model. Warm inflation differs from other forms of inflation primarily in that it makes the assumption that radiation and inflaton exist and interact throughout the inflationary process. After the warming process, e... |
1906.00485 | Hector O. Silva | Hector O. Silva, Nicol\'as Yunes | More than the sum of its parts: combining parameterized tests of extreme
gravity | (v1) 11 pages, 4 figures, 1 appendix; (v2) 12 pages, new appendix.
Matches published version | Phys. Rev. D 100, 084034 (2019) | 10.1103/PhysRevD.100.084034 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We connect two formalisms that describe deformations away from general
relativity, one valid in the strong-field regime of neutrons stars and another
valid in the radiative regime of gravitational waves: the
post-Tolman-Oppenheimer-Volkoff and the parametrized-post-Einsteinian
formalisms respectively. We find that po... | [
{
"created": "Sun, 2 Jun 2019 21:03:46 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Nov 2019 03:22:05 GMT",
"version": "v2"
}
] | 2019-11-11 | [
[
"Silva",
"Hector O.",
""
],
[
"Yunes",
"Nicolás",
""
]
] | We connect two formalisms that describe deformations away from general relativity, one valid in the strong-field regime of neutrons stars and another valid in the radiative regime of gravitational waves: the post-Tolman-Oppenheimer-Volkoff and the parametrized-post-Einsteinian formalisms respectively. We find that post... |
gr-qc/9710076 | Jacob D. Bekenstein | Jacob D. Bekenstein (Hebrew Universiy, Jerusalem) | Quantum Black Holes as Atoms | 20 pages, latex, uses mprocl.sty. Plenary talk at VIII Marcel
Grossmann Meeting on General Relativity, Jerusalem, June 1997. Added and
corrected references | Prodeedings of the Eight Marcel Grossmann Meeting, T. Piran and R.
Ruffini, eds. (World Scientific Singapore 1999), pp. 92-111 | null | null | gr-qc astro-ph hep-th quant-ph | null | In some respects the black hole plays the same role in gravitation that the
atom played in the nascent quantum mechanics. This analogy suggests that black
hole mass $M$ might have a discrete spectrum. I review the physical arguments
for the expectation that black hole horizon area eigenvalues are uniformly
spaced, or... | [
{
"created": "Wed, 15 Oct 1997 07:15:04 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 1998 14:44:42 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bekenstein",
"Jacob D.",
"",
"Hebrew Universiy, Jerusalem"
]
] | In some respects the black hole plays the same role in gravitation that the atom played in the nascent quantum mechanics. This analogy suggests that black hole mass $M$ might have a discrete spectrum. I review the physical arguments for the expectation that black hole horizon area eigenvalues are uniformly spaced, or e... |
1912.07630 | Shahar Hod | Shahar Hod | Spontaneous scalarization of Gauss-Bonnet black holes: Analytic
treatment in the linearized regime | 6 pages | Physical Review D 100, 064039 (2019) | 10.1103/PhysRevD.100.064039 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has recently been proved that nontrivial couplings between scalar fields
and the Gauss-Bonnet invariant of a curved spacetime may allow a central black
hole to support spatially regular scalar hairy configurations. Interestingly,
former numerical studies of the intriguing black-hole spontaneous scalarization
pheno... | [
{
"created": "Mon, 16 Dec 2019 19:00:20 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Hod",
"Shahar",
""
]
] | It has recently been proved that nontrivial couplings between scalar fields and the Gauss-Bonnet invariant of a curved spacetime may allow a central black hole to support spatially regular scalar hairy configurations. Interestingly, former numerical studies of the intriguing black-hole spontaneous scalarization phenome... |
2301.06764 | Subhajit Barman | Subhajit Barman, Bibhas Ranjan Majhi | Optimization of entanglement depends on whether a black hole is extremal | A modified version, to appear in General Relativity and Gravitation | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider two Unruh-DeWitt detectors interacting with a massless, minimally
coupled scalar field in a $(1+1)$ dimensional Reissner-Nordstr\"om black hole
spacetime. In particular, one of the detectors, corresponding to $Alice$, is
moving along an outgoing null trajectory. While the other detector carried by
$Bob$ i... | [
{
"created": "Tue, 17 Jan 2023 08:59:12 GMT",
"version": "v1"
},
{
"created": "Thu, 30 May 2024 12:51:01 GMT",
"version": "v2"
}
] | 2024-05-31 | [
[
"Barman",
"Subhajit",
""
],
[
"Majhi",
"Bibhas Ranjan",
""
]
] | We consider two Unruh-DeWitt detectors interacting with a massless, minimally coupled scalar field in a $(1+1)$ dimensional Reissner-Nordstr\"om black hole spacetime. In particular, one of the detectors, corresponding to $Alice$, is moving along an outgoing null trajectory. While the other detector carried by $Bob$ is ... |
gr-qc/0501003 | Alena Pravdov\'a | V. Pravda, A. Pravdova | WANDs of the Black Ring | 9 pages, 3 figures | Gen.Rel.Grav.37:1277-1287,2005 | 10.1007/s10714-005-0110-3 | null | gr-qc hep-th | null | Necessary conditions for various algebraic types of the Weyl tensor are
determined. These conditions are then used to find Weyl aligned null directions
for the black ring solution. It is shown that the black ring solution is
algebraically special, of type I_i, while locally on the horizon the type is
II. One exceptio... | [
{
"created": "Sat, 1 Jan 2005 22:56:18 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pravda",
"V.",
""
],
[
"Pravdova",
"A.",
""
]
] | Necessary conditions for various algebraic types of the Weyl tensor are determined. These conditions are then used to find Weyl aligned null directions for the black ring solution. It is shown that the black ring solution is algebraically special, of type I_i, while locally on the horizon the type is II. One exceptiona... |
1705.02747 | Woei Chet Lim | Daniele Gregoris, Woei Chet Lim, Alan Coley | Stiff fluid spike solutions from Bianchi type V seed solutions | 24 pages. 11 figures. Matches accepted version | null | 10.1088/1361-6382/aa924f | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we expand upon our previous work [1] by using the entire family
of Bianchi type V stiff fluid solutions as seed solutions of the Stephani
transformation. Among the new exact solutions generated, we observe a number of
important physical phenomena. The most interesting phenomenon is exact
solutions with ... | [
{
"created": "Mon, 8 May 2017 05:29:43 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Oct 2017 04:20:06 GMT",
"version": "v2"
}
] | 2017-12-06 | [
[
"Gregoris",
"Daniele",
""
],
[
"Lim",
"Woei Chet",
""
],
[
"Coley",
"Alan",
""
]
] | In this paper we expand upon our previous work [1] by using the entire family of Bianchi type V stiff fluid solutions as seed solutions of the Stephani transformation. Among the new exact solutions generated, we observe a number of important physical phenomena. The most interesting phenomenon is exact solutions with in... |
2201.06521 | Pardyumn Kumar Sahoo | Raja Solanki, Avik De, Sanjay Mandal, P.K. Sahoo | Accelerating expansion of the universe in modified symmetric
teleparallel gravity | PDU revised version | Physics of the Dark Universe 36 (2022) 101053 | 10.1016/j.dark.2022.101053 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | The fundamental nature and origin of dark energy are one of the premier
mysteries of theoretical physics. In General Relativity Theory, the
cosmological constant $\Lambda$ is the simplest explanation for dark energy. On
the other hand, the cosmological constant $\Lambda$ suffers from a delicate
issue so-called fine-t... | [
{
"created": "Mon, 17 Jan 2022 16:54:40 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2022 16:58:29 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Feb 2022 09:28:47 GMT",
"version": "v3"
},
{
"created": "Thu, 12 May 2022 15:28:38 GMT",
"version": "v4"
}
] | 2022-05-27 | [
[
"Solanki",
"Raja",
""
],
[
"De",
"Avik",
""
],
[
"Mandal",
"Sanjay",
""
],
[
"Sahoo",
"P. K.",
""
]
] | The fundamental nature and origin of dark energy are one of the premier mysteries of theoretical physics. In General Relativity Theory, the cosmological constant $\Lambda$ is the simplest explanation for dark energy. On the other hand, the cosmological constant $\Lambda$ suffers from a delicate issue so-called fine-tun... |
0901.0590 | Alfredo Sandoval-Villalbazo | A. Sandoval-Villalbazo, A. L. Garcia-Perciante and L.S. Garcia-Colin | The heat flux from a relativistic kinetic equation with a simplified
collision kernel | 4 pages, one figure. To appear in the AIP conference proceedings of
the XXXI Spanish Relativity Meeting: Physics and Mathematics of Gravitation.
Salamanca Spain, 15-19 September 2008 | AIP Conf.Proc.1122:388-391,2009 | 10.1063/1.3141333 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how using a special relativistic kinetic equation with a BGK- like
collision operator the ensuing expression for the heat flux can be casted in
the form required by Classical Irreversible Thermodynamics. Indeed, it is
linearly related to the temperature and number density gradients and not to the
acceleration... | [
{
"created": "Tue, 6 Jan 2009 02:50:02 GMT",
"version": "v1"
}
] | 2009-06-12 | [
[
"Sandoval-Villalbazo",
"A.",
""
],
[
"Garcia-Perciante",
"A. L.",
""
],
[
"Garcia-Colin",
"L. S.",
""
]
] | We show how using a special relativistic kinetic equation with a BGK- like collision operator the ensuing expression for the heat flux can be casted in the form required by Classical Irreversible Thermodynamics. Indeed, it is linearly related to the temperature and number density gradients and not to the acceleration a... |
gr-qc/0703001 | Lars Samuelsson | Max Karlovini and Lars Samuelsson | Elastic stars in general relativity: IV. Axial perturbations | 18 pages, no figures | Class.Quant.Grav.24:3171-3190,2007 | 10.1088/0264-9381/24/13/003 | null | gr-qc astro-ph | null | This is the fourth paper in a series that attempt to put forward a consistent
framework for modelling solid regions in neutron stars. Here we turn our
attention to axial perturbations of spherically symmetric spacetimes using a
gauge invariant approach due to one of us. Using the formalism developed in the
first pape... | [
{
"created": "Wed, 28 Feb 2007 21:41:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Karlovini",
"Max",
""
],
[
"Samuelsson",
"Lars",
""
]
] | This is the fourth paper in a series that attempt to put forward a consistent framework for modelling solid regions in neutron stars. Here we turn our attention to axial perturbations of spherically symmetric spacetimes using a gauge invariant approach due to one of us. Using the formalism developed in the first paper ... |
1603.05987 | Gandalf Lechner | Stefan Hollands and Gandalf Lechner | SO(d,1)-invariant Yang-Baxter operators and the dS/CFT correspondence | Minor changes in formulations and presentation. 48 pages | null | 10.1007/s00220-017-2942-6 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a model for the dS/CFT correspondence. The model is constructed in
terms of a "Yang-Baxter operator" $R$ for unitary representations of the
deSitter group $SO(d,1)$. This $R$-operator is shown to satisfy the Yang-Baxter
equation, unitarity, as well as certain analyticity relations, including in
particular ... | [
{
"created": "Fri, 18 Mar 2016 20:25:44 GMT",
"version": "v1"
},
{
"created": "Tue, 30 May 2017 11:06:43 GMT",
"version": "v2"
}
] | 2017-09-13 | [
[
"Hollands",
"Stefan",
""
],
[
"Lechner",
"Gandalf",
""
]
] | We propose a model for the dS/CFT correspondence. The model is constructed in terms of a "Yang-Baxter operator" $R$ for unitary representations of the deSitter group $SO(d,1)$. This $R$-operator is shown to satisfy the Yang-Baxter equation, unitarity, as well as certain analyticity relations, including in particular a ... |
1506.07061 | Jinn-Ouk Gong | Inyong Cho and Jinn-Ouk Gong | Spectral indices in Eddington-inspired Born-Infeld inflation | (v1) 9 pages, 1 figure; (v2) references added, to appear in Physical
Review D | Phys. Rev. D 92, 064046 (2015) | 10.1103/PhysRevD.92.064046 | APCTP-Pre2015-013 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the scalar and tensor spectral indices of the quadratic
inflation model in Eddington-inspired Born-Infeld (EiBI) gravity. We find that
the EiBI corrections to the spectral indices are of second and first order in
the slow-roll approximation for the scalar and tensor perturbations
respectively. This is ... | [
{
"created": "Tue, 23 Jun 2015 15:58:14 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2015 14:49:04 GMT",
"version": "v2"
}
] | 2015-09-30 | [
[
"Cho",
"Inyong",
""
],
[
"Gong",
"Jinn-Ouk",
""
]
] | We investigate the scalar and tensor spectral indices of the quadratic inflation model in Eddington-inspired Born-Infeld (EiBI) gravity. We find that the EiBI corrections to the spectral indices are of second and first order in the slow-roll approximation for the scalar and tensor perturbations respectively. This is ve... |
2405.03492 | Hong-Bo Jin | Hong-Bo Jin, Cong-Feng Qiao | Gravitational Wave Polarization Detection with Pyramid Constellation of
Gravitational Wave Observatory | 12 pages, 5 figures | null | null | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | For the first time, we have introduced the Pyramid Constellation of
Gravitational Wave Observatory (PCGO) for GW polarization detection. The PCGO
is composed of four identical spacecrafts (S/Cs). The laser telescopes and
their pointing structures are mounted on the S/C platform and are evenly
distributed at three loc... | [
{
"created": "Mon, 6 May 2024 14:02:59 GMT",
"version": "v1"
},
{
"created": "Wed, 8 May 2024 14:32:20 GMT",
"version": "v2"
}
] | 2024-05-09 | [
[
"Jin",
"Hong-Bo",
""
],
[
"Qiao",
"Cong-Feng",
""
]
] | For the first time, we have introduced the Pyramid Constellation of Gravitational Wave Observatory (PCGO) for GW polarization detection. The PCGO is composed of four identical spacecrafts (S/Cs). The laser telescopes and their pointing structures are mounted on the S/C platform and are evenly distributed at three locat... |
2210.05383 | Marcos Vinicius de Sousa Silva | Manuel E. Rodrigues, Marcos V. de S. Silva | Embedding regular black holes and black bounces in a cloud of strings | 14 pages, 2 figures, accepted for publication in PRD | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A string is the one-dimensional generalization of a point particle. In this
sense, the analog of a cloud of dust would be a cloud of strings. In this work,
we consider a cloud of strings around a regular solution in general gelativity.
We consider the Bardeen solution and the Simpson--Visser solution, analyzing
the c... | [
{
"created": "Sat, 8 Oct 2022 16:33:06 GMT",
"version": "v1"
}
] | 2022-10-12 | [
[
"Rodrigues",
"Manuel E.",
""
],
[
"Silva",
"Marcos V. de S.",
""
]
] | A string is the one-dimensional generalization of a point particle. In this sense, the analog of a cloud of dust would be a cloud of strings. In this work, we consider a cloud of strings around a regular solution in general gelativity. We consider the Bardeen solution and the Simpson--Visser solution, analyzing the con... |
2403.09576 | Stuart Dowker | J.S.Dowker | On the high-temperature expansion of the thermal energy on Einstein
cylinders | 5 pages | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Some exact high temperature expansions are derived using a temperature
inversion symmetry of the internal energy for conformal scalars and spinors on
the Einstein Universe.
| [
{
"created": "Thu, 14 Mar 2024 17:11:48 GMT",
"version": "v1"
}
] | 2024-03-15 | [
[
"Dowker",
"J. S.",
""
]
] | Some exact high temperature expansions are derived using a temperature inversion symmetry of the internal energy for conformal scalars and spinors on the Einstein Universe. |
1705.02496 | Maxim Makukov | Eduard G. Mychelkin, Maxim A. Makukov | Coordinate effect: Vaidya solutions without integrating the field
equations | Accepted in GRG | null | 10.1007/s10714-020-02767-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend Vaidya's algorithm for the description of a central mass losing or
gaining energy due to electromagnetic-type radiation (`null dust') to the case
of arbitrary radial corpuscular radiation. We also demonstrate the remarkable
possibility of purely algebraic deduction of the Vaidya solution without
integrating... | [
{
"created": "Sat, 6 May 2017 16:08:58 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Nov 2020 13:20:31 GMT",
"version": "v2"
}
] | 2020-11-19 | [
[
"Mychelkin",
"Eduard G.",
""
],
[
"Makukov",
"Maxim A.",
""
]
] | We extend Vaidya's algorithm for the description of a central mass losing or gaining energy due to electromagnetic-type radiation (`null dust') to the case of arbitrary radial corpuscular radiation. We also demonstrate the remarkable possibility of purely algebraic deduction of the Vaidya solution without integrating t... |
2107.14195 | Arnab Dhani | Arnab Dhani and B. S. Sathyaprakash | Overtones, mirror modes, and mode-mixing in binary black hole mergers | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves emitted in the aftermath of a black hole binary
coalescence have characteristic complex frequencies called quasinormal modes
(QNMs). These can be used to test the nature of the merger remnant, e.g. a test
of the black hole "no-hair" theorem. The relative excitation amplitudes of the
QNMs contain i... | [
{
"created": "Thu, 29 Jul 2021 17:30:05 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Aug 2021 13:59:42 GMT",
"version": "v2"
}
] | 2021-08-09 | [
[
"Dhani",
"Arnab",
""
],
[
"Sathyaprakash",
"B. S.",
""
]
] | Gravitational waves emitted in the aftermath of a black hole binary coalescence have characteristic complex frequencies called quasinormal modes (QNMs). These can be used to test the nature of the merger remnant, e.g. a test of the black hole "no-hair" theorem. The relative excitation amplitudes of the QNMs contain inf... |
2103.01258 | Antoine Folacci | Antoine Folacci and Aditya Tamar | Quasinormal mode frequencies of Kerr black holes from Regge trajectories | null | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A large portion of the studies concerning the quasinormal mode frequencies of
a Kerr black hole have focused only on achieving higher numerical accuracy with
limited emphasis on providing their physical interpretation. In this article,
we partially address this issue by computing the quasinormal mode frequency
spectr... | [
{
"created": "Mon, 1 Mar 2021 19:11:12 GMT",
"version": "v1"
}
] | 2021-03-03 | [
[
"Folacci",
"Antoine",
""
],
[
"Tamar",
"Aditya",
""
]
] | A large portion of the studies concerning the quasinormal mode frequencies of a Kerr black hole have focused only on achieving higher numerical accuracy with limited emphasis on providing their physical interpretation. In this article, we partially address this issue by computing the quasinormal mode frequency spectrum... |
gr-qc/0310060 | Albert V. Minkevich | A. V. Minkevich, A. S. Garkun, Yu. G. Vasilevski | Scalar fields superdense gravitating systems | 7 pages, Latex2e, report at XII Annual International Seminar
NPCS-2003, Minsk, 22--25 September, 2003 | Nonlin.Phenom.Complex Syst. 7 (2004) 78-84 | null | null | gr-qc | null | Solutions for scalar fields superdense gravitating systems of flat, open and
closed type obtained in the frame of gauge theories of gravitation are
discussed. Properties of these systems in dependence on parameter $\beta$ and
initial conditions are analyzed.
| [
{
"created": "Fri, 10 Oct 2003 19:27:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Minkevich",
"A. V.",
""
],
[
"Garkun",
"A. S.",
""
],
[
"Vasilevski",
"Yu. G.",
""
]
] | Solutions for scalar fields superdense gravitating systems of flat, open and closed type obtained in the frame of gauge theories of gravitation are discussed. Properties of these systems in dependence on parameter $\beta$ and initial conditions are analyzed. |
1504.07022 | Kirill Bronnikov | K.A. Bronnikov, O.B. Zaslavskii | Quasi-black holes: general features and purely field configurations | 6 revtex 2-column pages | Mod. Phys. Lett. A 30, No. 30, 1550154 (2015) | 10.1142/S0217732315501540 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Objects that are on the threshold of forming the horizon but never collapse
are called quasi-black holes (QBHs). We discuss the properties of the general
spherically symmetric QBH metric without addressing its material source,
including its limiting cases as the corresponding small parameter tends to
zero. We then sh... | [
{
"created": "Mon, 27 Apr 2015 10:54:40 GMT",
"version": "v1"
}
] | 2015-09-07 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Zaslavskii",
"O. B.",
""
]
] | Objects that are on the threshold of forming the horizon but never collapse are called quasi-black holes (QBHs). We discuss the properties of the general spherically symmetric QBH metric without addressing its material source, including its limiting cases as the corresponding small parameter tends to zero. We then show... |
2209.01574 | Ruben Campos Delgado | Ruben Campos Delgado and Sergei V. Ketov | Schwarzschild-type black holes in Starobinsky-Bel-Robinson gravity | 10 pages; v3: one more reference added, final version accepted for
publication in Physics Letters B | Physics Letters B 838 (2023) 137690 | 10.1016/j.physletb.2023.137690 | IPMU22-0059 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study physical properties of a Schwarzschild-type black hole in the
framework of the recently proposed Starobinsky-Bel-Robinson (SBR) modified
theory of gravity, working perturbatively in the new coupling constant. In
particular, we compute the temperature, entropy, pressure and lifetime of a
Schwarzschild-type bl... | [
{
"created": "Sun, 4 Sep 2022 09:06:52 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Nov 2022 11:04:24 GMT",
"version": "v2"
},
{
"created": "Tue, 10 Jan 2023 11:33:32 GMT",
"version": "v3"
}
] | 2023-01-24 | [
[
"Delgado",
"Ruben Campos",
""
],
[
"Ketov",
"Sergei V.",
""
]
] | We study physical properties of a Schwarzschild-type black hole in the framework of the recently proposed Starobinsky-Bel-Robinson (SBR) modified theory of gravity, working perturbatively in the new coupling constant. In particular, we compute the temperature, entropy, pressure and lifetime of a Schwarzschild-type blac... |
2201.00035 | Thanasis Karakasis | Thanasis Karakasis, Eleftherios Papantonopoulos, Zi-Yu Tang, Bin Wang | $(2+1)$-Dimensional Black Holes in $f(R,\phi)$ Gravity | Accepted for publication in PRD | Phys. Rev. D 105, 044038 (2022) | 10.1103/PhysRevD.105.044038 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We consider a $f(R)$ gravity theory in $(2+1)$-dimensions with a
self-interacting scalar field non-minimally coupled to gravity. Without
specifying the form of the $f(R)$ function, solving the field equations we find
that the Ricci scalar receives a non-linear correction term which breaks the
conformal invariance and... | [
{
"created": "Fri, 31 Dec 2021 19:29:37 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Feb 2022 16:29:25 GMT",
"version": "v2"
}
] | 2022-02-18 | [
[
"Karakasis",
"Thanasis",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
],
[
"Tang",
"Zi-Yu",
""
],
[
"Wang",
"Bin",
""
]
] | We consider a $f(R)$ gravity theory in $(2+1)$-dimensions with a self-interacting scalar field non-minimally coupled to gravity. Without specifying the form of the $f(R)$ function, solving the field equations we find that the Ricci scalar receives a non-linear correction term which breaks the conformal invariance and l... |
gr-qc/0212001 | Louapre | Laurent Freidel (ENS-Lyon, PI), David Louapre (ENS-Lyon) | Diffeomorphisms and spin foam models | 19 pages | Nucl.Phys. B662 (2003) 279-298 | 10.1016/S0550-3213(03)00306-7 | null | gr-qc hep-th | null | We study the action of diffeomorphisms on spin foam models. We prove that in
3 dimensions, there is a residual action of the diffeomorphisms that explains
the naive divergences of state sum models. We present the gauge fixing of this
symmetry and show that it explains the original renormalization of
Ponzano-Regge mod... | [
{
"created": "Fri, 29 Nov 2002 23:38:40 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jan 2003 14:32:17 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Freidel",
"Laurent",
"",
"ENS-Lyon, PI"
],
[
"Louapre",
"David",
"",
"ENS-Lyon"
]
] | We study the action of diffeomorphisms on spin foam models. We prove that in 3 dimensions, there is a residual action of the diffeomorphisms that explains the naive divergences of state sum models. We present the gauge fixing of this symmetry and show that it explains the original renormalization of Ponzano-Regge model... |
gr-qc/0308063 | Marcelo J. Reboucas | B. Mota, M.J. Reboucas, R. Tavakol | Constraints on the Detectability of Cosmic Topology from Observational
Uncertainties | 16 pages, 1 figure, LaTeX2e | Class.Quant.Grav. 20 (2003) 4837-4850 | 10.1088/0264-9381/20/22/008 | null | gr-qc astro-ph hep-th | null | Recent observational results suggest that our universe is nearly flat and
well modelled within a $\Lambda$CDM framework. The observed values of
$\Omega_{m}$ and $\Omega_{\Lambda}$ inevitably involve uncertainties. Motivated
by this, we make a systematic study of the necessary and sufficient conditions
for undetectabi... | [
{
"created": "Tue, 19 Aug 2003 23:39:39 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Oct 2003 01:57:38 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Mota",
"B.",
""
],
[
"Reboucas",
"M. J.",
""
],
[
"Tavakol",
"R.",
""
]
] | Recent observational results suggest that our universe is nearly flat and well modelled within a $\Lambda$CDM framework. The observed values of $\Omega_{m}$ and $\Omega_{\Lambda}$ inevitably involve uncertainties. Motivated by this, we make a systematic study of the necessary and sufficient conditions for undetectabili... |
1710.07267 | Orr Sela | Assaf Lanir, Adam Levi, Amos Ori and Orr Sela | Two-point function of a quantum scalar field in the interior region of a
Reissner-Nordstrom black hole | 14 pages, 1 figure; Minor modifications; Accepted for publication in
PRD | Phys. Rev. D 97, 024033 (2018) | 10.1103/PhysRevD.97.024033 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive explicit expressions for the two-point function of a massless
scalar field in the interior region of a Reissner-Nordstrom black hole, in both
the Unruh and Hartle-Hawking quantum states. The two-point function is
expressed in terms of the standard $lm\omega$ modes of the scalar field (those
associated with ... | [
{
"created": "Thu, 19 Oct 2017 17:51:35 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Jan 2018 12:42:50 GMT",
"version": "v2"
}
] | 2018-01-25 | [
[
"Lanir",
"Assaf",
""
],
[
"Levi",
"Adam",
""
],
[
"Ori",
"Amos",
""
],
[
"Sela",
"Orr",
""
]
] | We derive explicit expressions for the two-point function of a massless scalar field in the interior region of a Reissner-Nordstrom black hole, in both the Unruh and Hartle-Hawking quantum states. The two-point function is expressed in terms of the standard $lm\omega$ modes of the scalar field (those associated with a ... |
1802.03293 | Ahmadjon Abdujabbarov | Bobur Turimov, Bobomurat Ahmedov, Ahmadjon Abdujabbarov, Cosimo Bambi | Gravitational lensing by magnetized compact object in the presence of
plasma | 21 pages, 8 figures | null | 10.1142/S0218271820400131 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gravitational lensing in the weak field approximation assuming
the presence of a plasma and of a magnetic field around a compact gravitational
source. The external magnetic field causes the split of the image, as the
counterpart of the Zeeman effect. The magnetic field affects the magnification
of images... | [
{
"created": "Thu, 8 Feb 2018 10:36:22 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Feb 2018 08:13:45 GMT",
"version": "v2"
}
] | 2020-02-19 | [
[
"Turimov",
"Bobur",
""
],
[
"Ahmedov",
"Bobomurat",
""
],
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Bambi",
"Cosimo",
""
]
] | We study the gravitational lensing in the weak field approximation assuming the presence of a plasma and of a magnetic field around a compact gravitational source. The external magnetic field causes the split of the image, as the counterpart of the Zeeman effect. The magnetic field affects the magnification of images, ... |
2106.04393 | Robert John McLeod | Robert J. McLeod | A Brief Review Noether's Theorems and their Application to General
Relativity | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this article, we will review Noether's Theorems and their application in
General Relativity. We will present Noether's Theorems in their original form
and restate them as they are usually applied to physics. Some basic equations
of Special Relativity will be reviewed and contrasted with the equations in
General Re... | [
{
"created": "Sun, 6 Jun 2021 00:49:26 GMT",
"version": "v1"
}
] | 2021-06-09 | [
[
"McLeod",
"Robert J.",
""
]
] | In this article, we will review Noether's Theorems and their application in General Relativity. We will present Noether's Theorems in their original form and restate them as they are usually applied to physics. Some basic equations of Special Relativity will be reviewed and contrasted with the equations in General Rela... |
1909.07852 | Kenta Hioki | Kenta Hioki and Tomohiro Harada | Dynamical Transition from a Naked Singularity to a Black Hole | 10 pages, 13 figures, accepted for publication in International
Journal of Modern Physics A | null | 10.1142/S0217751X20502012 | RUP-19-25 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a Reissner-Nordstr\"{o}m (RN) black hole can be formed by
dropping a charged thin dust shell onto a RN naked singularity. This is in
contrast to the fact that a RN naked singularity is prohibited from forming by
dropping a charged thin dust shell onto a RN black hole. This implies the
strong tendency of ... | [
{
"created": "Tue, 17 Sep 2019 14:41:16 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Mar 2020 14:36:20 GMT",
"version": "v2"
},
{
"created": "Mon, 17 Aug 2020 13:51:01 GMT",
"version": "v3"
},
{
"created": "Sun, 8 Nov 2020 04:28:55 GMT",
"version": "v4"
}
] | 2020-12-02 | [
[
"Hioki",
"Kenta",
""
],
[
"Harada",
"Tomohiro",
""
]
] | We show that a Reissner-Nordstr\"{o}m (RN) black hole can be formed by dropping a charged thin dust shell onto a RN naked singularity. This is in contrast to the fact that a RN naked singularity is prohibited from forming by dropping a charged thin dust shell onto a RN black hole. This implies the strong tendency of th... |
2102.00972 | Horst R. Beyer | Horst Reinhard Beyer, Miguel Alcubierre and Miguel Megevand | Stability study of a model for the Klein-Gordon equation in Kerr
space-time II | 33 pages, 4 figures | null | 10.1016/S0034-4877(21)00059-8 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present paper is a follow-up of our previous paper that derives a
slightly simplified model equation for the Klein-Gordon equation, describing
the propagation of a scalar field of mass $\mu$ in the background of a rotating
black hole and, among others, supports the instability of the field down to
$a/M \approx 0.... | [
{
"created": "Mon, 1 Feb 2021 16:55:21 GMT",
"version": "v1"
}
] | 2021-09-15 | [
[
"Beyer",
"Horst Reinhard",
""
],
[
"Alcubierre",
"Miguel",
""
],
[
"Megevand",
"Miguel",
""
]
] | The present paper is a follow-up of our previous paper that derives a slightly simplified model equation for the Klein-Gordon equation, describing the propagation of a scalar field of mass $\mu$ in the background of a rotating black hole and, among others, supports the instability of the field down to $a/M \approx 0.97... |
gr-qc/9804062 | Jose Socorro Garcia Diaz | Jos\'e Socorro, Claus L\"ammerzahl, Alfredo Mac\'ias and Eckehard W.
Mielke | Multipole solutions in metric--affine gravity | 13 pages, Revtex, to appear in Phys. Lett. A | Phys.Lett. A244 (1998) 317-323 | 10.1016/S0375-9601(98)00360-0 | IFUG-98-05 | gr-qc | null | Above Planck energies, the spacetime might become non--Riemannian, as it is
known fron string theory and inflation. Then geometries arise in which
nonmetricity and torsion appear as field strengths, side by side with
curvature. By gauging the affine group, a metric affine gauge theory emerges as
dynamical framework. ... | [
{
"created": "Thu, 23 Apr 1998 23:18:04 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Socorro",
"José",
""
],
[
"Lämmerzahl",
"Claus",
""
],
[
"Macías",
"Alfredo",
""
],
[
"Mielke",
"Eckehard W.",
""
]
] | Above Planck energies, the spacetime might become non--Riemannian, as it is known fron string theory and inflation. Then geometries arise in which nonmetricity and torsion appear as field strengths, side by side with curvature. By gauging the affine group, a metric affine gauge theory emerges as dynamical framework. He... |
2010.13558 | Kyriakos Papadopoulos | Kyriakos Papadopoulos, Nazli Kurt | On Completeness of the Alexandrov Topology on a Spacetime: remarks and
some corrections | null | null | 10.1142/S0219887821501024 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We clarify and discuss a misunderstanding between uniform completeness and
metric completeness, that has appeared in the literature in a study on the
Alexandrov topology for a spacetime.
| [
{
"created": "Fri, 23 Oct 2020 05:49:56 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Nov 2020 12:31:11 GMT",
"version": "v2"
}
] | 2021-06-30 | [
[
"Papadopoulos",
"Kyriakos",
""
],
[
"Kurt",
"Nazli",
""
]
] | We clarify and discuss a misunderstanding between uniform completeness and metric completeness, that has appeared in the literature in a study on the Alexandrov topology for a spacetime. |
1808.01288 | B\'eatrice Bonga | B\'eatrice Bonga and Eric Poisson | Coulombic contribution to the flux of angular momentum in general
relativity | accepted for publication in PRD; major revision of previous version
(conclusion altered); 10 pages + 6 pages as appendix | Phys. Rev. D 99, 064024 (2019) | 10.1103/PhysRevD.99.064024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The flux of angular momentum in electromagnetism cannot be expressed entirely
in terms of the field's radiative degrees of freedom. Its expression also
involves Coulombic pieces of the field, in the form of a charge aspect
$q(\theta,\phi)$, a function of polar angles whose integral gives the total
charge of the syste... | [
{
"created": "Fri, 3 Aug 2018 18:00:29 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2019 14:16:15 GMT",
"version": "v2"
}
] | 2019-03-27 | [
[
"Bonga",
"Béatrice",
""
],
[
"Poisson",
"Eric",
""
]
] | The flux of angular momentum in electromagnetism cannot be expressed entirely in terms of the field's radiative degrees of freedom. Its expression also involves Coulombic pieces of the field, in the form of a charge aspect $q(\theta,\phi)$, a function of polar angles whose integral gives the total charge of the system.... |
1302.5407 | Muhammad Sharif | M. Sharif and Rabia Saleem | Dark Energy Models and Laws of Thermodynamics in Bianchi I Model | 12 pages, 2 figures | Mod. Phys. Lett. A 27(2012)1250187 | 10.1142/S0217732312501878 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to check validity of the laws of thermodynamics for LRS
Bianchi type I universe model which is filled with combination of dark matter
and dark energy. We take two types of dark energy models, i.e., generalized
holographic dark energy and generalized Ricci dark energy. It is proved that
the first... | [
{
"created": "Wed, 20 Feb 2013 02:40:08 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Sharif",
"M.",
""
],
[
"Saleem",
"Rabia",
""
]
] | This paper is devoted to check validity of the laws of thermodynamics for LRS Bianchi type I universe model which is filled with combination of dark matter and dark energy. We take two types of dark energy models, i.e., generalized holographic dark energy and generalized Ricci dark energy. It is proved that the first a... |
gr-qc/0404009 | Oleg Zaslavskii | O.B. Zaslavskii | Near-extremal and extremal quantum-corrected two-dimensional charged
black holes | 25 pages. Typos corrected. To appear in Class. Quant. Grav | Class.Quant.Grav. 21 (2004) 2687-2701 | 10.1088/0264-9381/21/11/012 | ESI - 1479 | gr-qc hep-th | null | We consider charged black holes within dilaton gravity with
exponential-linear dependence of action coefficients on dilaton and minimal
coupling to quantum scalar fields. This includes, in particular, CGHS and RST
black holes in the uncharged limit. For non-extremal configuration quantum
correction to the total mass,... | [
{
"created": "Thu, 1 Apr 2004 16:52:12 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Apr 2004 19:27:19 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We consider charged black holes within dilaton gravity with exponential-linear dependence of action coefficients on dilaton and minimal coupling to quantum scalar fields. This includes, in particular, CGHS and RST black holes in the uncharged limit. For non-extremal configuration quantum correction to the total mass, H... |
gr-qc/0506094 | Dilek Ciftci | M. Arik and D. Ciftci | Brane World Cosmology In Jordan-Brans-Dicke Theory | 11 pages | Gen.Rel.Grav. 37 (2005) 2211-2221 | 10.1007/s10714-005-0201-1 | null | gr-qc | null | We consider the embedding of 3+1 dimensional cosmology in 4+1 dimensional
Jordan-Brans-Dicke theory. We show that exponentially growing and power law
scale factors are implied. Whereas the 4+1 dimensional scalar field is
approximately constant for each, the effective 3+1 dimensional scalar field is
constant for expon... | [
{
"created": "Fri, 17 Jun 2005 12:43:11 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Arik",
"M.",
""
],
[
"Ciftci",
"D.",
""
]
] | We consider the embedding of 3+1 dimensional cosmology in 4+1 dimensional Jordan-Brans-Dicke theory. We show that exponentially growing and power law scale factors are implied. Whereas the 4+1 dimensional scalar field is approximately constant for each, the effective 3+1 dimensional scalar field is constant for exponen... |
1106.2831 | John Ward | Narit Pidokrajt, John Ward | Thermodynamic Geometry and Type 0A Black Holes | 13 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we study thermodynamic geometry of the type 0A black hole
solution in string theory using a variety of different methods (Ruppeiner,
Weinhold and Geometrothermodynamics). Our results indicate that the curvature
invariants are finite for all physical solutions, suggesting that there is no
phase transition... | [
{
"created": "Tue, 14 Jun 2011 22:04:11 GMT",
"version": "v1"
}
] | 2011-06-16 | [
[
"Pidokrajt",
"Narit",
""
],
[
"Ward",
"John",
""
]
] | In this note we study thermodynamic geometry of the type 0A black hole solution in string theory using a variety of different methods (Ruppeiner, Weinhold and Geometrothermodynamics). Our results indicate that the curvature invariants are finite for all physical solutions, suggesting that there is no phase transition. ... |
1901.00167 | Supriya Pan | Jaume Haro, Jaume Amor\'os and Supriya Pan | The Peebles -- Vilenkin quintessential inflation model revisited | 28 pages; 7 captioned figures; version published in The European
Physical Journal C | Eur.Phys.J. C79 (2019) no.6, 505 | 10.1140/epjc/s10052-019-7012-0 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the well-known Peebles-Vilenkin (PV) quintessential inflation model
and discuss its possible improvements in agreement with the recent
observations. The improved PV model depends only on two parameters: the
inflaton mass $m$, and another smaller mass $M$; where the latter has to be
chosen in order to undert... | [
{
"created": "Tue, 1 Jan 2019 15:34:12 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Jun 2019 19:06:58 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jun 2019 16:23:30 GMT",
"version": "v3"
}
] | 2019-06-27 | [
[
"Haro",
"Jaume",
""
],
[
"Amorós",
"Jaume",
""
],
[
"Pan",
"Supriya",
""
]
] | We review the well-known Peebles-Vilenkin (PV) quintessential inflation model and discuss its possible improvements in agreement with the recent observations. The improved PV model depends only on two parameters: the inflaton mass $m$, and another smaller mass $M$; where the latter has to be chosen in order to undertak... |
2108.07210 | Masoud Ghezelbash | Masoud Ghezelbash | Bianchi IX geometry and the Einstein-Maxwell theory | 38 pages, 16 figures, new contents, figures and four appendices
added, references added, to appear in classical and quantum gravity | Class. Quantum Grav. 39 (2022) 075012 | 10.1088/1361-6382/ac504e | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct numerical solutions to the higher-dimensional Einstein-Maxwell
theory. The solutions are based on embedding the four dimensional Bianchi type
IX space in the theory. We find the solutions as superposition of two
functions, which one of them can be found numerically. We show that the
solutions in any dime... | [
{
"created": "Mon, 16 Aug 2021 16:37:53 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Feb 2022 18:05:04 GMT",
"version": "v2"
}
] | 2022-04-14 | [
[
"Ghezelbash",
"Masoud",
""
]
] | We construct numerical solutions to the higher-dimensional Einstein-Maxwell theory. The solutions are based on embedding the four dimensional Bianchi type IX space in the theory. We find the solutions as superposition of two functions, which one of them can be found numerically. We show that the solutions in any dimens... |
gr-qc/0202006 | Harold Blas | A. Accioly, H. Blas and H. Mukai | Nonminimal coupling, equivalence principle and exact Foldy-Wouthuysen
transformation | 9 pages, LaTex | null | null | null | gr-qc | null | It is shown that the exact Foldy-Wouthuysen transformation for spin-0
particles on spacetimes described by the metrics $ds^2 = V^2 dt^2 - W^2 d
{\bf{x}}^2$, where $V=V({\bf{x}})$ and $W=W({\bf{x}})$, only exists if the
scalar field is nonminimally coupled to the Ricci scalar field with a coupling
constant equal to 1/... | [
{
"created": "Sat, 2 Feb 2002 18:48:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Accioly",
"A.",
""
],
[
"Blas",
"H.",
""
],
[
"Mukai",
"H.",
""
]
] | It is shown that the exact Foldy-Wouthuysen transformation for spin-0 particles on spacetimes described by the metrics $ds^2 = V^2 dt^2 - W^2 d {\bf{x}}^2$, where $V=V({\bf{x}})$ and $W=W({\bf{x}})$, only exists if the scalar field is nonminimally coupled to the Ricci scalar field with a coupling constant equal to 1/6.... |
gr-qc/9408008 | null | J. Schirmer | Hamiltonian reduction of Bianchi Cosmologies | 14 pages, Latex, Freiburg preprint THEP 94/21 | Class.Quant.Grav.12:1099-1110,1995 | 10.1088/0264-9381/12/4/017 | null | gr-qc | null | It was noted recently that the ADM-diffeomorphism-constraint does not
generate all observed symmetries for several Bianchi-models. We will suggest
not to use the ADM-constraint restricted to homogeneous variables, but some
equivalent which is derived from a restricted action principle. This will
generate all homogene... | [
{
"created": "Thu, 4 Aug 1994 22:00:31 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Schirmer",
"J.",
""
]
] | It was noted recently that the ADM-diffeomorphism-constraint does not generate all observed symmetries for several Bianchi-models. We will suggest not to use the ADM-constraint restricted to homogeneous variables, but some equivalent which is derived from a restricted action principle. This will generate all homogeneit... |
0711.1584 | Mikhail V. Gorbatenko | Mikhail V.Gorbatenko | Conformal Geometrodynamics: Exact Nonstationary Spherically Symmetric
Solutions | 13 pages | null | null | null | gr-qc | null | A nonstationary spherically symmetric problem for conformal geometrodynamics
equations is considered and general exact solutions in quadratures are
obtained. Involvement of Weyl degrees of freedom allows us to consider the
problem with arbitrary initial data, as for the conformal geometrodynamics
equations the Cauchy... | [
{
"created": "Sat, 10 Nov 2007 10:29:12 GMT",
"version": "v1"
}
] | 2007-11-13 | [
[
"Gorbatenko",
"Mikhail V.",
""
]
] | A nonstationary spherically symmetric problem for conformal geometrodynamics equations is considered and general exact solutions in quadratures are obtained. Involvement of Weyl degrees of freedom allows us to consider the problem with arbitrary initial data, as for the conformal geometrodynamics equations the Cauchy p... |
2310.17311 | Suddhasattwa Brahma | Suddhasattwa Brahma and Abhinove Nagarajan Seenivasan | Gravity-induced entanglement as a probe of spacetime curvature | Honorable Mention in the 2023 Essay Competition of the Gravity
Research Foundation; comments welcome | null | 10.1142/S0218271823420208 | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | It is now widely believed that if the gravitational field is (perturbatively)
quantum, it would entangle two massive objects (in spatial superpositions)
which were otherwise unentangled to begin with. Recently, actual table-top
experiments have been proposed to test this idea in what would be the first
detection of p... | [
{
"created": "Thu, 26 Oct 2023 11:16:35 GMT",
"version": "v1"
}
] | 2023-10-27 | [
[
"Brahma",
"Suddhasattwa",
""
],
[
"Seenivasan",
"Abhinove Nagarajan",
""
]
] | It is now widely believed that if the gravitational field is (perturbatively) quantum, it would entangle two massive objects (in spatial superpositions) which were otherwise unentangled to begin with. Recently, actual table-top experiments have been proposed to test this idea in what would be the first detection of per... |
gr-qc/0608078 | Roland Triay | Roland Triay (CPT), Henri-Hugues Fliche (LMMT) | Spherical Voids in Newton-Friedmann Universe | to appear | Proceedings of the Eleventh Marcel Grossmann Meeting on General
Relativity, Allemagne (2007) | null | null | gr-qc astro-ph | null | We show that the cosmological constant favours significantly the growth of
voids in the universe. This dynamical effect is investigated within a newtonian
approach with an extension to Friedmann-Lema\^{\i}tre model.
| [
{
"created": "Wed, 16 Aug 2006 15:40:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Triay",
"Roland",
"",
"CPT"
],
[
"Fliche",
"Henri-Hugues",
"",
"LMMT"
]
] | We show that the cosmological constant favours significantly the growth of voids in the universe. This dynamical effect is investigated within a newtonian approach with an extension to Friedmann-Lema\^{\i}tre model. |
2206.13672 | Matheus Filipe Santos Alves | Matheus F. S. Alves, Lu\'is F. M. A. M. Reis, L. G. Medeiros | Gravitational waves from inspiraling black holes in quadratic gravity | 19 pages, 9 figures | Phys. Rev. D 107, 044017 (2023) | 10.1103/PhysRevD.107.044017 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We peform a study of gravitational waves emitted by inspiraling black holes
in the context of quadratic gravity. By linearizing the field equations around
a flat background, we demonstrate that all degrees of freedom satisfy wave-like
equations. These degrees of freedom split into three modes: a massive spin-$2$
mode... | [
{
"created": "Tue, 28 Jun 2022 00:23:14 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 2023 23:03:01 GMT",
"version": "v2"
}
] | 2023-02-13 | [
[
"Alves",
"Matheus F. S.",
""
],
[
"Reis",
"Luís F. M. A. M.",
""
],
[
"Medeiros",
"L. G.",
""
]
] | We peform a study of gravitational waves emitted by inspiraling black holes in the context of quadratic gravity. By linearizing the field equations around a flat background, we demonstrate that all degrees of freedom satisfy wave-like equations. These degrees of freedom split into three modes: a massive spin-$2$ mode, ... |
1202.5157 | W{\l}odzimierz Natorf | W{\l}odzimierz Natorf | Asymptotic stability of vacuum type II metrics | some typos removed in v2 | J. Math. Phys. 53, 022503 (2012); | 10.1063/1.3682273 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We generalize the result of Lukacs {\it et al.} on asymptotic stability of
the Schwarzschild metric with respect to perturbations in the Robinson-Trautman
class of metrics to the case of Petrov type II twisting metrics, uder the
condition of asymptotic flatness at future null infinity. The Bondi energy is
used as the... | [
{
"created": "Thu, 23 Feb 2012 12:22:32 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Apr 2012 10:27:45 GMT",
"version": "v2"
}
] | 2012-04-13 | [
[
"Natorf",
"Włodzimierz",
""
]
] | We generalize the result of Lukacs {\it et al.} on asymptotic stability of the Schwarzschild metric with respect to perturbations in the Robinson-Trautman class of metrics to the case of Petrov type II twisting metrics, uder the condition of asymptotic flatness at future null infinity. The Bondi energy is used as the L... |
2401.07662 | Charis Anastopoulos | Charis Anastopoulos | Final States in Quantum Cosmology: Cosmic Acceleration as a Quantum
Post-Selection Effect | 33 pages, 5 figures. Greatly extended and restructured; it now
contains a derivation of post-selected quasi-classical equations of motion
for generic systems, and more examples | null | null | null | gr-qc astro-ph.CO quant-ph | http://creativecommons.org/licenses/by/4.0/ | Standard quantum theory admits naturally statistical ensembles that are both
pre-selected and post-selected, i.e., they involve both an initial and a final
state. We argue that there is no compelling physical reason to preclude a
probability assignment with a final quantum state at the cosmological level. We
therefor... | [
{
"created": "Mon, 15 Jan 2024 13:05:28 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Jul 2024 10:54:17 GMT",
"version": "v2"
}
] | 2024-07-30 | [
[
"Anastopoulos",
"Charis",
""
]
] | Standard quantum theory admits naturally statistical ensembles that are both pre-selected and post-selected, i.e., they involve both an initial and a final state. We argue that there is no compelling physical reason to preclude a probability assignment with a final quantum state at the cosmological level. We therefore ... |
1811.08852 | Isaac Torres | Isaac Torres, J\'ulio C\'esar Fabris, and Oliver Fabio Piattella | Classical and quantum cosmology of Fab Four John theories | null | Physics Letters B 798 (2019) 135003 | 10.1016/j.physletb.2019.135003 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We present here a quantum cosmological model with Bohm-de Broglie
interpretation of the theory described by a combination of two terms of the Fab
Four cosmological theory. The first term is the John Lagrangian and the second
is a potential representing matter content to avoid classical trivial
solutions. This model h... | [
{
"created": "Wed, 21 Nov 2018 17:57:06 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Nov 2018 22:03:33 GMT",
"version": "v2"
},
{
"created": "Fri, 11 Oct 2019 21:34:53 GMT",
"version": "v3"
}
] | 2019-10-15 | [
[
"Torres",
"Isaac",
""
],
[
"Fabris",
"Júlio César",
""
],
[
"Piattella",
"Oliver Fabio",
""
]
] | We present here a quantum cosmological model with Bohm-de Broglie interpretation of the theory described by a combination of two terms of the Fab Four cosmological theory. The first term is the John Lagrangian and the second is a potential representing matter content to avoid classical trivial solutions. This model has... |
1606.07041 | Pierre-Henri Chavanis | Pierre-Henri Chavanis and Tonatiuh Matos | Covariant theory of Bose-Einstein condensates in curved spacetimes with
electromagnetic interactions: the hydrodynamic approach | null | Eur. Phys. J. Plus, 132, 30 (2017) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a hydrodynamic representation of the Klein-Gordon-Maxwell-Einstein
equations. These equations combine quantum mechanics, electromagnetism, and
general relativity. We consider the case of an arbitrary curved spacetime, the
case of weak gravitational fields in a static or expanding background, and the
nonrel... | [
{
"created": "Wed, 22 Jun 2016 18:56:54 GMT",
"version": "v1"
}
] | 2017-11-27 | [
[
"Chavanis",
"Pierre-Henri",
""
],
[
"Matos",
"Tonatiuh",
""
]
] | We develop a hydrodynamic representation of the Klein-Gordon-Maxwell-Einstein equations. These equations combine quantum mechanics, electromagnetism, and general relativity. We consider the case of an arbitrary curved spacetime, the case of weak gravitational fields in a static or expanding background, and the nonrelat... |
gr-qc/9805017 | Fodor Gyula | G. Fodor, M. Marklund, and Z. Perj\'es | Axistationary perfect fluids -- a tetrad approach | 12 pages | Class.Quant.Grav. 16 (1999) 453-463 | 10.1088/0264-9381/16/2/010 | null | gr-qc | null | Stationary axisymmetric perfect fluid space-times are investigated using the
curvature description of geometries. Attention is focused on space-times with a
vanishing electric part of the Weyl tensor. It is shown that the only
incompressible axistationary magnetic perfect fluid is the interior
Schwarzschild solution.... | [
{
"created": "Wed, 6 May 1998 13:18:56 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Fodor",
"G.",
""
],
[
"Marklund",
"M.",
""
],
[
"Perjés",
"Z.",
""
]
] | Stationary axisymmetric perfect fluid space-times are investigated using the curvature description of geometries. Attention is focused on space-times with a vanishing electric part of the Weyl tensor. It is shown that the only incompressible axistationary magnetic perfect fluid is the interior Schwarzschild solution. T... |
2002.06059 | Roger Hurtado PhD | Roger A. Hurtado and Jose R. Arenas | Spherically symmetric and static solutions in $f(R)$ gravity coupled
with EM fields | 14 pages, 2 figures | Phys. Rev. D 102, 104019 (2020) | 10.1103/PhysRevD.102.104019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Solutions of field equations in $f(R)$ gravity are found for a spherically
symmetric and static spacetime in the Born-Infeld (BI) non-linear
electrodynamics. It is found that the models supported in this configuration
must have the parametric form $f'(R)|_{r}=m+n r$, with $m,n$ constants, whose
value and sign have a ... | [
{
"created": "Fri, 14 Feb 2020 14:46:39 GMT",
"version": "v1"
}
] | 2020-11-18 | [
[
"Hurtado",
"Roger A.",
""
],
[
"Arenas",
"Jose R.",
""
]
] | Solutions of field equations in $f(R)$ gravity are found for a spherically symmetric and static spacetime in the Born-Infeld (BI) non-linear electrodynamics. It is found that the models supported in this configuration must have the parametric form $f'(R)|_{r}=m+n r$, with $m,n$ constants, whose value and sign have a st... |
1707.02216 | Yi-Shi Duan | Yi-Shi Duan | Generalized Nonsingular Solutions for the Scalar Meson Field of a Point
Charge in General Relativity Theory | 2 pages | Soviet Physics JETP Vol 31, 1098-1099 (1956) | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown that in investigating the electromagnetic and meson fields
of elementary particles, the effects of gravitational interaction cannot be
neglected. The present note is an attempt to find solutions to the equations of
the general relativistic gravitational and scalar meson fields of a point
nuclear cha... | [
{
"created": "Wed, 24 May 2017 03:39:38 GMT",
"version": "v1"
}
] | 2017-07-10 | [
[
"Duan",
"Yi-Shi",
""
]
] | It has been shown that in investigating the electromagnetic and meson fields of elementary particles, the effects of gravitational interaction cannot be neglected. The present note is an attempt to find solutions to the equations of the general relativistic gravitational and scalar meson fields of a point nuclear charg... |
gr-qc/9906070 | Piotr Bizon | P. Bizo\'n and T. Chmaj | Remark on formation of colored black holes via fine tuning | 2 pages, RevTex, 2 postscript figures | Phys.Rev. D61 (2000) 067501 | 10.1103/PhysRevD.61.067501 | null | gr-qc | null | In a recent paper (gr-qc/9903081) Choptuik, Hirschmann, and Marsa have
discovered the scaling law for the lifetime of an intermediate attractor in the
formation of n=1 colored black holes via fine tuning. We show that their result
is in agreement with the prediction of linear perturbation analysis. We also
briefly co... | [
{
"created": "Thu, 17 Jun 1999 06:26:58 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bizoń",
"P.",
""
],
[
"Chmaj",
"T.",
""
]
] | In a recent paper (gr-qc/9903081) Choptuik, Hirschmann, and Marsa have discovered the scaling law for the lifetime of an intermediate attractor in the formation of n=1 colored black holes via fine tuning. We show that their result is in agreement with the prediction of linear perturbation analysis. We also briefly comm... |
gr-qc/0103044 | John Baez | John C. Baez and Emory F. Bunn | The Meaning of Einstein's Equation | 23 pages LaTeX, 8 encapsulated Postscript figures; unlike the
published version this includes a derivation of the inverse-square force law | Amer. Jour. Phys. 73 (2005), 644-652 | 10.1119/1.1852541 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a brief introduction to general relativity, designed for both
students and teachers of the subject. While there are many excellent
expositions of general relativity, few adequately explain the geometrical
meaning of the basic equation of the theory: Einstein's equation. Here we give
a simple formulation of th... | [
{
"created": "Tue, 13 Mar 2001 22:38:05 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Apr 2001 01:30:30 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Aug 2004 17:39:22 GMT",
"version": "v3"
},
{
"created": "Thu, 5 Jan 2006 18:23:17 GMT",
"version": "v4"
},
{
"cre... | 2015-06-15 | [
[
"Baez",
"John C.",
""
],
[
"Bunn",
"Emory F.",
""
]
] | This is a brief introduction to general relativity, designed for both students and teachers of the subject. While there are many excellent expositions of general relativity, few adequately explain the geometrical meaning of the basic equation of the theory: Einstein's equation. Here we give a simple formulation of this... |
gr-qc/0306061 | Miguel Gustavo de Campos Batista | M. de Campos | Adiabatic decaying vacuum model for the universe | 10 pages, 2 figures | Gen.Rel.Grav.35:899-906,2003 | 10.1023/A:1022907506957 | null | gr-qc | null | We study a model that the entropy per particle in the universe is constant.
The sources for the entropy are the particle creation and a lambda decaying
term. We find exact solutions for the Einstein field equations and show the
compatibilty of the model with respect to the age and the acceleration of the
universe.
| [
{
"created": "Sun, 15 Jun 2003 20:53:50 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Jun 2003 22:22:50 GMT",
"version": "v2"
}
] | 2009-04-17 | [
[
"de Campos",
"M.",
""
]
] | We study a model that the entropy per particle in the universe is constant. The sources for the entropy are the particle creation and a lambda decaying term. We find exact solutions for the Einstein field equations and show the compatibilty of the model with respect to the age and the acceleration of the universe. |
1712.04834 | Giorgio Papini | Giorgio Papini | Spin and maximal acceleration | 8 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the spin current tensor of a Dirac particle at accelerations close
to the upper limit introduced by Caianiello. Continual interchange between
particle spin and angular momentum is possible only when the acceleration is
time-dependent. This represents a stringent limit on the effect that maximal
acceleration ... | [
{
"created": "Wed, 13 Dec 2017 16:06:08 GMT",
"version": "v1"
}
] | 2017-12-14 | [
[
"Papini",
"Giorgio",
""
]
] | We study the spin current tensor of a Dirac particle at accelerations close to the upper limit introduced by Caianiello. Continual interchange between particle spin and angular momentum is possible only when the acceleration is time-dependent. This represents a stringent limit on the effect that maximal acceleration ma... |
gr-qc/9908025 | Jorma Louko | Jorma Louko, Hans-Juergen Matschull | (2+1)-dimensional Einstein-Kepler problem in the centre-of-mass frame | 38 pages, REVTeX v3.1 with amsfonts and epsf, 12 eps figures. (v2:
Presentational improvement, references added, typos corrected.) | Class.Quant.Grav. 17 (2000) 1847-1873 | 10.1088/0264-9381/17/8/307 | AEI 1999-015, MZ-TH/99-31 | gr-qc | null | We formulate and analyze the Hamiltonian dynamics of a pair of massive
spinless point particles in (2+1)-dimensional Einstein gravity by anchoring the
system to a conical infinity, isometric to the infinity generated by a single
massive but possibly spinning particle. The reduced phase space \Gamma_{red}
has dimensio... | [
{
"created": "Sun, 8 Aug 1999 13:31:32 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Mar 2000 19:40:06 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Louko",
"Jorma",
""
],
[
"Matschull",
"Hans-Juergen",
""
]
] | We formulate and analyze the Hamiltonian dynamics of a pair of massive spinless point particles in (2+1)-dimensional Einstein gravity by anchoring the system to a conical infinity, isometric to the infinity generated by a single massive but possibly spinning particle. The reduced phase space \Gamma_{red} has dimension ... |
gr-qc/0312039 | Kostas Kokkotas | Kostas D. Kokkotas | High frequency sources of gravitational waves | 7 pages, Class. Quantum Grav. in press. Proceedings of the 5th Amaldi
Conference | Nucl.Phys.Proc.Suppl.138:433-435,2005 | 10.1016/j.nuclphysbps.2004.11.099 | null | gr-qc | null | Sources of high frequency gravitational waves are reviewed. Gravitational
collapse, rotational instabilities and oscillations of the remnant compact
objects are potentially important sources of gravitational waves. Significant
and unique information for the various stages of the collapse, the evolution of
protoneutro... | [
{
"created": "Sun, 7 Dec 2003 18:25:02 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Kokkotas",
"Kostas D.",
""
]
] | Sources of high frequency gravitational waves are reviewed. Gravitational collapse, rotational instabilities and oscillations of the remnant compact objects are potentially important sources of gravitational waves. Significant and unique information for the various stages of the collapse, the evolution of protoneutron ... |
0801.1562 | S Habib Mazharimousavi | S. Habib Mazharimousavi and M. Halilsoy | 5D-Black Hole Solution in Einstein-Yang-Mills-Gauss-Bonnet Theory | 5 pages, no figures | Phys.Rev.D76:087501,2007 | 10.1103/PhysRevD.76.087501 | null | gr-qc | null | By adopting the 5D version of the Wu-Yang Ansatz we present in closed form a
black hole solution in the Einstein-Yang-Mills-Gauss-Bonnet (EYMGB) theory. In
the EYM limit, we recover the 5D black hole solution already known.
| [
{
"created": "Thu, 10 Jan 2008 08:34:54 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
]
] | By adopting the 5D version of the Wu-Yang Ansatz we present in closed form a black hole solution in the Einstein-Yang-Mills-Gauss-Bonnet (EYMGB) theory. In the EYM limit, we recover the 5D black hole solution already known. |
gr-qc/0505163 | Todd Fugleberg | K. Choy, T. Kruk, M.E. Carrington, T. Fugleberg, J. Zahn, R. Kobes, G.
Kunstatter, D. Pickering | Energy Flow in Acoustic Black Holes | 8 pages, 9 figures, Comments added to discussion of energy flow and
introductory section abbreviated | Phys.Rev. D73 (2006) 104011 | 10.1103/PhysRevD.73.104011 | null | gr-qc hep-th | null | We present the results of an analysis of superradiant energy flow due to
scalar fields incident on an acoustic black hole. In addition to providing
independent confirmation of the recent results in [5], we determine in detail
the profile of energy flow everywhere outside the horizon. We confirm
explicitly that in a s... | [
{
"created": "Tue, 31 May 2005 18:45:35 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Oct 2005 17:07:15 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Choy",
"K.",
""
],
[
"Kruk",
"T.",
""
],
[
"Carrington",
"M. E.",
""
],
[
"Fugleberg",
"T.",
""
],
[
"Zahn",
"J.",
""
],
[
"Kobes",
"R.",
""
],
[
"Kunstatter",
"G.",
""
],
[
"Pickering",
"D.",
... | We present the results of an analysis of superradiant energy flow due to scalar fields incident on an acoustic black hole. In addition to providing independent confirmation of the recent results in [5], we determine in detail the profile of energy flow everywhere outside the horizon. We confirm explicitly that in a sui... |
gr-qc/0006078 | Joshua A. Faber | Joshua A. Faber, Frederic A. Rasio, and Justin B. Manor | Post-Newtonian SPH calculations of binary neutron star coalescence. II.
Binary mass ratio, equation of state, and spin dependence | RevTeX, 38 pages, 24 figures, Minor Corrections, to appear in Phys.
Rev. D | Phys.Rev. D63 (2001) 044012 | 10.1103/PhysRevD.63.044012 | null | gr-qc astro-ph | null | Using our new Post-Newtonian SPH (smoothed particle hydrodynamics) code, we
study the final coalescence and merging of neutron star (NS) binaries. We vary
the stiffness of the equation of state (EOS) as well as the initial binary mass
ratio and stellar spins. Results are compared to those of Newtonian
calculations, w... | [
{
"created": "Thu, 22 Jun 2000 00:02:40 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Oct 2000 21:12:42 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Faber",
"Joshua A.",
""
],
[
"Rasio",
"Frederic A.",
""
],
[
"Manor",
"Justin B.",
""
]
] | Using our new Post-Newtonian SPH (smoothed particle hydrodynamics) code, we study the final coalescence and merging of neutron star (NS) binaries. We vary the stiffness of the equation of state (EOS) as well as the initial binary mass ratio and stellar spins. Results are compared to those of Newtonian calculations, wit... |
1306.1527 | Joan Sola | Joan Sola | Cosmological constant and vacuum energy: old and new ideas | 86 pages, substantially extended discussion, many new references
added | J.Phys.Conf.Ser. 453 (2013) 012015 | 10.1088/1742-6596/453/1/012015 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cosmological constant (CC) term in Einstein's equations, Lambda, was
first associated to the idea of vacuum energy density. Notwithstanding, it is
well-known that there is a huge, in fact appalling, discrepancy between the
theoretical prediction and the observed value picked from the modern
cosmological data. Thi... | [
{
"created": "Thu, 6 Jun 2013 19:58:11 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jun 2013 19:08:16 GMT",
"version": "v2"
},
{
"created": "Sun, 21 Jul 2013 19:58:21 GMT",
"version": "v3"
}
] | 2015-03-19 | [
[
"Sola",
"Joan",
""
]
] | The cosmological constant (CC) term in Einstein's equations, Lambda, was first associated to the idea of vacuum energy density. Notwithstanding, it is well-known that there is a huge, in fact appalling, discrepancy between the theoretical prediction and the observed value picked from the modern cosmological data. This ... |
gr-qc/0511112 | Luis Herrera | L. Herrera, N.O. Santos and J. Carot | Gravitational radiation, vorticity and the electric and magnetic part of
Weyl tensor | 17 pages Latex. Typos corrected | J.Math.Phys. 47 (2006) 052502 | 10.1063/1.2199027 | null | gr-qc | null | The electric and the magnetic part of the Weyl tensor, as well as the
invariants obtained from them, are calculated for the Bondi vacuum metric. One
of the invariants vanishes identically and the other only exhibits
contributions from terms of the Weyl tensor containing the static part of the
field. It is shown that ... | [
{
"created": "Sun, 20 Nov 2005 21:07:55 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Mar 2006 19:21:31 GMT",
"version": "v2"
},
{
"created": "Mon, 15 May 2006 20:35:07 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Herrera",
"L.",
""
],
[
"Santos",
"N. O.",
""
],
[
"Carot",
"J.",
""
]
] | The electric and the magnetic part of the Weyl tensor, as well as the invariants obtained from them, are calculated for the Bondi vacuum metric. One of the invariants vanishes identically and the other only exhibits contributions from terms of the Weyl tensor containing the static part of the field. It is shown that th... |
1605.07205 | Antonios Tsokaros A. | Antonios Tsokaros, Bruno C. Mundim, Filippo Galeazzi, Luciano
Rezzolla, K\=oji Ury\=u | Initial-data contribution to the error budget of gravitational waves
from neutron-star binaries | 17 pages, 11 figures | Phys. Rev. D 94, 044049 (2016) | 10.1103/PhysRevD.94.044049 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As numerical calculations of inspiralling neutron-star binaries reach values
of accuracy that are comparable with those of binary black holes, a fine
budgeting of the various sources of error becomes increasingly important. Among
such sources, the initial data is normally not accounted for, the rationale
being that t... | [
{
"created": "Mon, 23 May 2016 20:17:05 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Tsokaros",
"Antonios",
""
],
[
"Mundim",
"Bruno C.",
""
],
[
"Galeazzi",
"Filippo",
""
],
[
"Rezzolla",
"Luciano",
""
],
[
"Uryū",
"Kōji",
""
]
] | As numerical calculations of inspiralling neutron-star binaries reach values of accuracy that are comparable with those of binary black holes, a fine budgeting of the various sources of error becomes increasingly important. Among such sources, the initial data is normally not accounted for, the rationale being that the... |
2405.15874 | Himanshu Chaudhary | Ujjal Debnath, Himanshu Chaudhary, Niyaz Uddin Molla, S. K. J. Pacif
and G.Mustafa | Dark Energy Model in Einstein and Horava-Lifshitz Gravity with a new
Parametrization of $\omega(z)$: Model Comparison, Analysis and Observational
Constraint | 19 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel dynamical dark energy model within the frameworks of both
Einstein gravity and Horava-Lifshitz gravity. Utilizing a new parametrization
of the dark energy equation of state $\omega(z)$, we derive solutions to the
field equations. By employing recent cosmological datasets, such as cosmic
chronometer... | [
{
"created": "Fri, 24 May 2024 18:39:57 GMT",
"version": "v1"
}
] | 2024-05-28 | [
[
"Debnath",
"Ujjal",
""
],
[
"Chaudhary",
"Himanshu",
""
],
[
"Molla",
"Niyaz Uddin",
""
],
[
"Pacif",
"S. K. J.",
""
],
[
"Mustafa",
"G.",
""
]
] | We present a novel dynamical dark energy model within the frameworks of both Einstein gravity and Horava-Lifshitz gravity. Utilizing a new parametrization of the dark energy equation of state $\omega(z)$, we derive solutions to the field equations. By employing recent cosmological datasets, such as cosmic chronometer d... |
2112.12861 | Shahn Majid | Chengcheng Liu and Shahn Majid | Quantum geodesics on $\lambda$-Minkowski spacetime | 28 pages amslatex, 3 pdf figures; some small corrections and
clarified the notation in a couple of places | null | 10.1088/1751-8121/ac7593 | null | gr-qc hep-th math.QA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply a recent formalism of quantum geodesics to the well-known
bicrossproduct model $\lambda$-Minkowski quantum spacetime
$[x^i,t]=\imath\lambda_p x^i$ with its flat quantum metric as a model of
quantum gravity effects, with $\lambda_p$ the Planck scale. As examples,
quantum geodesic flow of a plane wave gets an ... | [
{
"created": "Wed, 22 Dec 2021 18:36:04 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Feb 2022 20:55:33 GMT",
"version": "v2"
}
] | 2022-11-23 | [
[
"Liu",
"Chengcheng",
""
],
[
"Majid",
"Shahn",
""
]
] | We apply a recent formalism of quantum geodesics to the well-known bicrossproduct model $\lambda$-Minkowski quantum spacetime $[x^i,t]=\imath\lambda_p x^i$ with its flat quantum metric as a model of quantum gravity effects, with $\lambda_p$ the Planck scale. As examples, quantum geodesic flow of a plane wave gets an or... |
2003.14088 | Iver Brevik | I. Brevik and A. V. Timoshkin | Rip brane cosmology from a viscous holographic dark fluid | 11 pages, to appear in Int. J. Geom. Methods in Mod. Phys | Int. J. Geom. Meth. Mod. Phys. 17(2020)2050087 | 10.1142/S0219887820500875 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article is devoted to the application of the holographic principle to
describe Rip brane cosmological models in the presence of a bulk viscosity. We
make use of the generalized infrared-cutoff holographic dark energy, introduced
by Nojiri and Odintsov We consider various examples: Rip brane cosmology
correspondi... | [
{
"created": "Tue, 31 Mar 2020 10:53:53 GMT",
"version": "v1"
}
] | 2020-06-05 | [
[
"Brevik",
"I.",
""
],
[
"Timoshkin",
"A. V.",
""
]
] | This article is devoted to the application of the holographic principle to describe Rip brane cosmological models in the presence of a bulk viscosity. We make use of the generalized infrared-cutoff holographic dark energy, introduced by Nojiri and Odintsov We consider various examples: Rip brane cosmology corresponding... |
0903.2128 | Matt Visser | Jozef Skakala (Victoria University of Wellington) and Matt Visser
(Victoria University of Wellington) | Birkhoff-like theorem for rotating stars in (2+1) dimensions | 4 pages; uses revtex4; V2: added 1 very important reference;
significantly expanded discussion; many small changes in the text but no
significant change in physics conclusions; V3: minor typos fixed | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Consider a rotating and possibly pulsating "star" in (2+1) dimensions. If the
star is axially symmetric, then in the vacuum region surrounding the star, (a
region that we assume at most contains a cosmological constant), the Einstein
equations imply that under physically plausible conditions the geometry is in
fact s... | [
{
"created": "Thu, 12 Mar 2009 09:37:46 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Mar 2009 05:07:10 GMT",
"version": "v2"
},
{
"created": "Sun, 22 Mar 2009 19:26:26 GMT",
"version": "v3"
}
] | 2009-03-22 | [
[
"Skakala",
"Jozef",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Consider a rotating and possibly pulsating "star" in (2+1) dimensions. If the star is axially symmetric, then in the vacuum region surrounding the star, (a region that we assume at most contains a cosmological constant), the Einstein equations imply that under physically plausible conditions the geometry is in fact sta... |
0704.1802 | Comelli Denis | Denis Comelli | A Way to Dynamically Overcome the Cosmological Constant Problem | 5 pages | Int.J.Mod.Phys.A23:4133-4143,2008 | 10.1142/S0217751X08041359 | null | gr-qc astro-ph | null | The Cosmological Constant problem can be solved once we require that the full
standard Einstein Hilbert lagrangian, gravity plus matter, is multiplied by a
total derivative. We analyze such a picture writing the total derivative as the
covariant gradient of a new vector field (b_mu). The dynamics of this b_mu
field c... | [
{
"created": "Fri, 13 Apr 2007 17:29:06 GMT",
"version": "v1"
}
] | 2009-01-06 | [
[
"Comelli",
"Denis",
""
]
] | The Cosmological Constant problem can be solved once we require that the full standard Einstein Hilbert lagrangian, gravity plus matter, is multiplied by a total derivative. We analyze such a picture writing the total derivative as the covariant gradient of a new vector field (b_mu). The dynamics of this b_mu field can... |
0806.2415 | Yungui Gong | Ximing Chen, Jie Liu, Yungui Gong | Constraints on Dark Energy Models from Weak Gravity Conjecture | 4 two column pages, 3 figures, accepted by Chin. Phys. Lett | Chin.Phys.Lett.25:3086-3089,2008 | 10.1088/0256-307X/25/8/094 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the constraints on the dark energy model with constant equation of
state parameter $w=p/\rho$ and the holographic dark energy model by using the
weak gravity conjecture. The combination of weak gravity conjecture and the
observational data gives $w<-0.7$ at the $3\sigma$ confidence level. The
holographic dar... | [
{
"created": "Sun, 15 Jun 2008 04:16:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Chen",
"Ximing",
""
],
[
"Liu",
"Jie",
""
],
[
"Gong",
"Yungui",
""
]
] | We study the constraints on the dark energy model with constant equation of state parameter $w=p/\rho$ and the holographic dark energy model by using the weak gravity conjecture. The combination of weak gravity conjecture and the observational data gives $w<-0.7$ at the $3\sigma$ confidence level. The holographic dark ... |
2006.09026 | Sergey Paston | S.A. Paston | Dark matter from non-relativistic embedding gravity | LaTeX, 11 pages. This version corresponds to the published one | Modern Physics Letters A, Vol. 36, No. 15, 2150101 (2021) | 10.1142/S0217732321501017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the possibility to explain the mystery of the dark matter through
the transition from General Relativity to embedding gravity. This modification
of gravity, which was proposed by Regge and Teitelboim, is based on a simple
string-inspired geometrical principle: our spacetime is considered here as a
4-dimensio... | [
{
"created": "Tue, 16 Jun 2020 09:46:56 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Jun 2021 09:19:03 GMT",
"version": "v2"
}
] | 2021-06-08 | [
[
"Paston",
"S. A.",
""
]
] | We study the possibility to explain the mystery of the dark matter through the transition from General Relativity to embedding gravity. This modification of gravity, which was proposed by Regge and Teitelboim, is based on a simple string-inspired geometrical principle: our spacetime is considered here as a 4-dimensiona... |
2107.10682 | Fei-Quan Tu | Fei-Quan Tu, Yi-Xin Chen, Qi-Hong Huang | A cosmic accelerated scenario based on degrees of freedom of the
spacetime | 11 pages, 1 figure | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several recent investigations have shown that there is a holographic
relationship between the bulk degrees of freedom and the surface degrees of
freedom in the spacetime. Furthermore, the entropy on the horizon can produce
an entropic force effect on the bulk degrees of freedom. In this paper, we
explore the dynamic ... | [
{
"created": "Thu, 22 Jul 2021 13:41:14 GMT",
"version": "v1"
}
] | 2021-07-23 | [
[
"Tu",
"Fei-Quan",
""
],
[
"Chen",
"Yi-Xin",
""
],
[
"Huang",
"Qi-Hong",
""
]
] | Several recent investigations have shown that there is a holographic relationship between the bulk degrees of freedom and the surface degrees of freedom in the spacetime. Furthermore, the entropy on the horizon can produce an entropic force effect on the bulk degrees of freedom. In this paper, we explore the dynamic ev... |
1611.02932 | Manuel Kraemer | David Brizuela, Claus Kiefer, Manuel Kraemer | Quantum-gravitational effects on gauge-invariant scalar and tensor
perturbations during inflation: The slow-roll approximation | 16 pages, 7 figures, clarifications and references added | Phys. Rev. D 94, 123527 (2016) | 10.1103/PhysRevD.94.123527 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We continue our study on corrections from canonical quantum gravity to the
power spectra of gauge-invariant inflationary scalar and tensor perturbations.
A direct canonical quantization of a perturbed inflationary universe model is
implemented, which leads to a Wheeler-DeWitt equation. For this equation, a
semiclassi... | [
{
"created": "Wed, 9 Nov 2016 13:51:30 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Dec 2016 17:00:06 GMT",
"version": "v2"
}
] | 2017-01-02 | [
[
"Brizuela",
"David",
""
],
[
"Kiefer",
"Claus",
""
],
[
"Kraemer",
"Manuel",
""
]
] | We continue our study on corrections from canonical quantum gravity to the power spectra of gauge-invariant inflationary scalar and tensor perturbations. A direct canonical quantization of a perturbed inflationary universe model is implemented, which leads to a Wheeler-DeWitt equation. For this equation, a semiclassica... |
1907.09201 | Euaggelos E. Zotos | Euaggelos E. Zotos, Fredy L. Dubeibe, Jan Nagler, Emilio Tejeda | Orbit classification in a pseudo-Newtonian Copenhagen problem with
Schwarzschild-like primaries | Published in Monthly Notices of the Royal Astronomical Society
(MNRAS) journal | MNRAS, vol. 487, 2340-2353 (2019) | 10.1093/mnras/stz1432 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the orbital dynamics of the planar pseudo-Newtonian Copenhagen
problem, in the case of a binary system of Schwarzschild-like primaries, such
as super-massive black holes. In particular, we investigate how the Jacobi
constant (which is directly connected with the energy of the orbits) influences
several asp... | [
{
"created": "Mon, 22 Jul 2019 09:42:48 GMT",
"version": "v1"
}
] | 2019-07-23 | [
[
"Zotos",
"Euaggelos E.",
""
],
[
"Dubeibe",
"Fredy L.",
""
],
[
"Nagler",
"Jan",
""
],
[
"Tejeda",
"Emilio",
""
]
] | We examine the orbital dynamics of the planar pseudo-Newtonian Copenhagen problem, in the case of a binary system of Schwarzschild-like primaries, such as super-massive black holes. In particular, we investigate how the Jacobi constant (which is directly connected with the energy of the orbits) influences several aspec... |
gr-qc/9603002 | Masafumi Seriu | Masafumi Seriu | The spectral representation of the spacetime structure: The `distance'
between universes with different topologies | 47 pages | Phys.Rev.D53:6902-6920,1996 | 10.1103/PhysRevD.53.6902 | YITP-96-9 | gr-qc | null | We investigate the representation of the geometrical information of the
universe in terms of the eigenvalues of the Laplacian defined on the universe.
We concentrate only on one specific problem along this line: To introduce a
concept of distance between universes in terms of the difference in the
spectra.
We can f... | [
{
"created": "Fri, 1 Mar 1996 14:28:19 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Seriu",
"Masafumi",
""
]
] | We investigate the representation of the geometrical information of the universe in terms of the eigenvalues of the Laplacian defined on the universe. We concentrate only on one specific problem along this line: To introduce a concept of distance between universes in terms of the difference in the spectra. We can find ... |
gr-qc/0402044 | Simon F. Ross | Tim Clunan, Simon F. Ross and Douglas J. Smith | On Gauss-Bonnet black hole entropy | 14 pages, no figures. v2: references added; v3,v4: more references
added | Class.Quant.Grav. 21 (2004) 3447-3458 | 10.1088/0264-9381/21/14/009 | null | gr-qc hep-th | null | We investigate the entropy of black holes in Gauss-Bonnet and Lovelock
gravity using the Noether charge approach, in which the entropy is given as the
integral of a suitable (n-2) form charge over the event horizon. We compare the
results to those obtained in other approaches. We also comment on the
appearance of neg... | [
{
"created": "Tue, 10 Feb 2004 09:47:09 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Feb 2004 14:33:54 GMT",
"version": "v2"
},
{
"created": "Fri, 20 Feb 2004 17:26:41 GMT",
"version": "v3"
},
{
"created": "Fri, 10 Dec 2004 16:10:15 GMT",
"version": "v4"
}
] | 2009-11-10 | [
[
"Clunan",
"Tim",
""
],
[
"Ross",
"Simon F.",
""
],
[
"Smith",
"Douglas J.",
""
]
] | We investigate the entropy of black holes in Gauss-Bonnet and Lovelock gravity using the Noether charge approach, in which the entropy is given as the integral of a suitable (n-2) form charge over the event horizon. We compare the results to those obtained in other approaches. We also comment on the appearance of negat... |
2006.05242 | W{\l}odzimierz Piechocki | W{\l}odzimierz Piechocki | Generic singularity of general relativity and its quantum fate | 9 pages, no figures, extended version of essay | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Belinski-Khalatnikov-Lifshitz scenario concerns the existence of generic
singularity of general relativity. At the singularity, there is a breakdown of
all known laws of physics. Quantization of this scenario leads, however, to
regular quantum evolution. The singularity is avoided by a quantum bounce. It
is fairl... | [
{
"created": "Tue, 9 Jun 2020 13:27:59 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Jul 2020 04:27:12 GMT",
"version": "v2"
}
] | 2020-07-20 | [
[
"Piechocki",
"Włodzimierz",
""
]
] | The Belinski-Khalatnikov-Lifshitz scenario concerns the existence of generic singularity of general relativity. At the singularity, there is a breakdown of all known laws of physics. Quantization of this scenario leads, however, to regular quantum evolution. The singularity is avoided by a quantum bounce. It is fairly ... |
gr-qc/0201103 | Giovanni Imponente | Giovanni Imponente and Giovanni Montani | Covariant Mixmaster Dynamics | null | in ''Similarities and Universality in Relativistic Flows'', Ed. by
Logos Verlag, Berlin (2001) | null | null | gr-qc | null | We provide a Hamiltonian analysis of the Mixmaster Universe dynamics on the
base of a standard Arnowitt-Deser-Misner Hamiltonian approach, showing the
covariant nature of its chaotic behaviour with respect to the choice of any
time variable, from the point of view either of the dynamical systems theory,
either of the... | [
{
"created": "Thu, 31 Jan 2002 14:30:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Imponente",
"Giovanni",
""
],
[
"Montani",
"Giovanni",
""
]
] | We provide a Hamiltonian analysis of the Mixmaster Universe dynamics on the base of a standard Arnowitt-Deser-Misner Hamiltonian approach, showing the covariant nature of its chaotic behaviour with respect to the choice of any time variable, from the point of view either of the dynamical systems theory, either of the s... |
gr-qc/9606059 | Roland Steinbauer | Roland Steinbauer | The ultrarelativistic Reissner-Nordstrom field in the Colombeau algebra | final version, minor grammatical changes | J.Math.Phys. 38 (1997) 1614-1622 | 10.1063/1.531819 | null | gr-qc math-ph math.MP | null | The electromagnetic field of the ultrarelativistic Reissner-Nordstrom
solution shows the physically highly unsatisfactory property of a vanishing
field tensor but a nonzero, i.e., delta-like, energy density. The aim of this
work is to analyze this situation from a mathematical point of view, using the
framework of Co... | [
{
"created": "Wed, 19 Jun 1996 10:01:09 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Feb 1997 11:08:09 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Steinbauer",
"Roland",
""
]
] | The electromagnetic field of the ultrarelativistic Reissner-Nordstrom solution shows the physically highly unsatisfactory property of a vanishing field tensor but a nonzero, i.e., delta-like, energy density. The aim of this work is to analyze this situation from a mathematical point of view, using the framework of Colo... |
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