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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0305105 | Atalay Karasu | M. Gurses, Y. Ipekoglu, A. Karasu, C. Senturk | Higher Dimensional Bell-Szekeres Metric | 5 pages, REVTeX4, no figures | Phys.Rev. D68 (2003) 084007 | 10.1103/PhysRevD.68.084007 | null | gr-qc hep-th | null | The collision of pure electromagnetic plane waves with collinear polarization
in N-dimensional (N=2+n) Einstein-Maxwell theory is considered. A class of
exact solutions for the higher dimensional Bell-Szekeres metric is obtained and
its singularity structure is examined.
| [
{
"created": "Wed, 28 May 2003 15:44:10 GMT",
"version": "v1"
},
{
"created": "Fri, 30 May 2003 10:13:48 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Gurses",
"M.",
""
],
[
"Ipekoglu",
"Y.",
""
],
[
"Karasu",
"A.",
""
],
[
"Senturk",
"C.",
""
]
] | The collision of pure electromagnetic plane waves with collinear polarization in N-dimensional (N=2+n) Einstein-Maxwell theory is considered. A class of exact solutions for the higher dimensional Bell-Szekeres metric is obtained and its singularity structure is examined. |
gr-qc/9503065 | Ernie Chow | E. W. M. Chow and A. W.-C. Lun | Apparent Horizons in Vacuum Robinson-Trautman Spacetimes | Talk given at the Inaugural Australian General Relativity Workshop,
26 September 1994. 14 pages, Latex, 4 Postscript figures (supplied as
uuencoded compressed tar file), uses "epsf.tex" macros. Paper and figures
also available from http://www.maths.monash.edu.au/~ernie/papers/ | null | null | Monash University Applied Mathematics Preprint 8/95 | gr-qc | null | Vacuum asymptotically flat Robinson-Trautman spacetimes are a well known
class of spacetimes exhibiting outgoing gravitational radiation. In this paper
we describe a method of locating the past apparent horizon in these spacetimes,
and discuss the properties of the horizon. We show that the past apparent
horizon is n... | [
{
"created": "Sat, 1 Apr 1995 09:30:20 GMT",
"version": "v1"
}
] | 2009-02-19 | [
[
"Chow",
"E. W. M.",
""
],
[
"Lun",
"A. W. -C.",
""
]
] | Vacuum asymptotically flat Robinson-Trautman spacetimes are a well known class of spacetimes exhibiting outgoing gravitational radiation. In this paper we describe a method of locating the past apparent horizon in these spacetimes, and discuss the properties of the horizon. We show that the past apparent horizon is non... |
1612.06715 | Luca Guido Molinari | Carlo Alberto Mantica and Luca Guido Molinari | Twisted Lorentzian manifolds, a characterization with torse-forming
time-like unit vectors | 6 pages, marginal errors corrected, reference updated | Gen. Relativ. Gravit. 49:51 (2017) | 10.1007/s10714-017-2211-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Robertson-Walker and Generalized Robertson-Walker spacetimes may be
characterized by the existence of a time-like unit torse-forming vector field,
with other constrains. We show that Twisted manifolds may still be
characterized by the existence of such (unique) vector field, with no other
constrain. Twisted manifolds... | [
{
"created": "Tue, 20 Dec 2016 15:45:32 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Mar 2017 20:05:05 GMT",
"version": "v2"
}
] | 2019-05-21 | [
[
"Mantica",
"Carlo Alberto",
""
],
[
"Molinari",
"Luca Guido",
""
]
] | Robertson-Walker and Generalized Robertson-Walker spacetimes may be characterized by the existence of a time-like unit torse-forming vector field, with other constrains. We show that Twisted manifolds may still be characterized by the existence of such (unique) vector field, with no other constrain. Twisted manifolds g... |
1911.08383 | Bayram Tekin | Emel Altas, Bayram Tekin | Non-stationary Energy in General Relativity | 16 pages,dedicated to the memory of Rahmi Guven (1948-2019) who spent
a life in gravity research in a region quite timid about science | Phys. Rev. D 101, 024035 (2020) | 10.1103/PhysRevD.101.024035 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the time evolution equations of (cosmological) General Relativity in
the first order Fischer-Marsden form, we construct an integral that measures
the amount of non-stationary energy on a given spacelike hypersurface in $D$
dimensions. The integral vanishes for stationary spacetimes; and with a further
assumptio... | [
{
"created": "Tue, 19 Nov 2019 16:31:37 GMT",
"version": "v1"
}
] | 2020-01-22 | [
[
"Altas",
"Emel",
""
],
[
"Tekin",
"Bayram",
""
]
] | Using the time evolution equations of (cosmological) General Relativity in the first order Fischer-Marsden form, we construct an integral that measures the amount of non-stationary energy on a given spacelike hypersurface in $D$ dimensions. The integral vanishes for stationary spacetimes; and with a further assumption,... |
gr-qc/9705010 | null | Andrzej Krasinski (N. Copernicus Astronomical Center and College of
Science, Polish Academy of Sciences, Warsaw) | Rotating dust solutions of Einstein's equations with 3-dimensional
symmetry groups; Part 1: Two Killing fields spanned on u^{\alpha} and
w^{\alpha } | 23 pages, LaTeX | J.Math.Phys. 39 (1998) 380-400 | 10.1063/1.532300 | 318 (May 1997) | gr-qc | null | For a rotating dust with a 3-dimensional symmetry group all possible metric
forms can be classified and, within each class, explicitly written out. This is
made possible by the formalism of Pleba\'nski based on the Darboux theorem. In
the resulting coordinates, the Killing vector fields (if any exist) assume a
specia... | [
{
"created": "Wed, 7 May 1997 13:14:55 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Krasinski",
"Andrzej",
"",
"N. Copernicus Astronomical Center and College of\n Science, Polish Academy of Sciences, Warsaw"
]
] | For a rotating dust with a 3-dimensional symmetry group all possible metric forms can be classified and, within each class, explicitly written out. This is made possible by the formalism of Pleba\'nski based on the Darboux theorem. In the resulting coordinates, the Killing vector fields (if any exist) assume a special ... |
0911.2243 | Vitor Cardoso | Emanuele Berti, Vitor Cardoso, Leonardo Gualtieri, Frans Pretorius,
Ulrich Sperhake | Comment on "Kerr Black Holes as Particle Accelerators to Arbitrarily
High Energy" | Accepted for publication in Physical Review Letters. v2: Published
version | Phys.Rev.Lett.103:239001,2009 | 10.1103/PhysRevLett.103.239001 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been suggested that rotating black holes could serve as particle
colliders with arbitrarily high center-of-mass energy. Astrophysical
limitations on the maximal spin, back-reaction effects and sensitivity to the
initial conditions impose severe limits on the likelihood of such collisions.
| [
{
"created": "Wed, 11 Nov 2009 21:11:23 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Dec 2009 21:37:05 GMT",
"version": "v2"
}
] | 2009-12-14 | [
[
"Berti",
"Emanuele",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Pretorius",
"Frans",
""
],
[
"Sperhake",
"Ulrich",
""
]
] | It has been suggested that rotating black holes could serve as particle colliders with arbitrarily high center-of-mass energy. Astrophysical limitations on the maximal spin, back-reaction effects and sensitivity to the initial conditions impose severe limits on the likelihood of such collisions. |
gr-qc/0111077 | Pavluchenko Sergey A. | S. A. Pavluchenko, N. Yu. Savchenko and A.V.Toporensky | The generality of inflation in some closed FRW models with a scalar
field | 15 pages with 5 eps figures; small corrections in text; final version
to appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D11 (2002) 805-816 | 10.1142/S0218271802002049 | null | gr-qc | null | The generality of inflation in closed FRW Universe is studied for the models
with a scalar field on a brane and with a complex scalar field. The results
obtained are compared with the previously known results for the model with a
scalar field and a perfect fluid. The influence of the measure chosen in the
initial con... | [
{
"created": "Thu, 22 Nov 2001 17:12:46 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Apr 2002 11:53:44 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Pavluchenko",
"S. A.",
""
],
[
"Savchenko",
"N. Yu.",
""
],
[
"Toporensky",
"A. V.",
""
]
] | The generality of inflation in closed FRW Universe is studied for the models with a scalar field on a brane and with a complex scalar field. The results obtained are compared with the previously known results for the model with a scalar field and a perfect fluid. The influence of the measure chosen in the initial condi... |
0711.3602 | Nelson Pinto-Neto | Nelson Pinto-Neto and Bernardo M. O. Fraga | Cosmic acceleration from interaction of ordinary fluids | 10 pages, no figures, accepted for publication in General Relativity
and Gravitation | Gen.Rel.Grav.40:1653-1662,2008 | 10.1007/s10714-007-0565-5 | null | gr-qc | null | Cosmological models with two interacting fluids, each satisfying the strong
energy condition, are studied in the framework of classical General Relativity.
If the interactions are phenomenologically described by a power law in the
scale factor, the two initial interacting fluids can be equivalently
substituted by two... | [
{
"created": "Thu, 22 Nov 2007 15:36:44 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pinto-Neto",
"Nelson",
""
],
[
"Fraga",
"Bernardo M. O.",
""
]
] | Cosmological models with two interacting fluids, each satisfying the strong energy condition, are studied in the framework of classical General Relativity. If the interactions are phenomenologically described by a power law in the scale factor, the two initial interacting fluids can be equivalently substituted by two n... |
gr-qc/0703052 | Eyo Ita III | Eyo Eyo Ita III | Finite states in four dimensional quantized gravity | 42 pages: Accepted for publication by Class. Quantum Grav. journal | Class.Quant.Grav.25:125001,2008; Class.Quant.Grav.25:125002,2008 | 10.1088/0264-9381/25/12/125001 10.1088/0264-9381/25/12/125002 | null | gr-qc | null | This is the first in a series of papers outlining an algorithm to explicitly
construct finite quantum states of the full theory of gravity in Ashtekar
variables. The algorithm is based upon extending some properties of a special
state, the Kodama state for pure gravity with cosmological term, to
matter-coupled models... | [
{
"created": "Thu, 8 Mar 2007 11:52:00 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Oct 2007 23:48:35 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Nov 2007 08:07:23 GMT",
"version": "v3"
},
{
"created": "Mon, 11 Feb 2008 20:48:34 GMT",
"version": "v4"
},
{
"cre... | 2008-11-26 | [
[
"Ita",
"Eyo Eyo",
"III"
]
] | This is the first in a series of papers outlining an algorithm to explicitly construct finite quantum states of the full theory of gravity in Ashtekar variables. The algorithm is based upon extending some properties of a special state, the Kodama state for pure gravity with cosmological term, to matter-coupled models. ... |
gr-qc/9803068 | Andrei Linde | Raphael Bousso and Andrei Linde | Quantum Creation of a Universe with $\Omega \not = 1$: Singular and
Non-Singular Instantons | 9 pages, revtex, 6 figures, few misprints improved | Phys.Rev.D58:083503,1998 | 10.1103/PhysRevD.58.083503 | SU-ITP-98-15 | gr-qc astro-ph hep-ph hep-th | null | We propose two new classes of instantons which describe the tunneling and/or
quantum creation of closed and open universes. The instantons leading to an
open universe can be considered as generalizations of the Coleman-De-Luccia
solution. They are non-singular, unlike the instantons recently studied by
Hawking and Tu... | [
{
"created": "Thu, 19 Mar 1998 00:56:39 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Mar 1998 04:48:17 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Apr 1998 20:41:12 GMT",
"version": "v3"
}
] | 2009-09-29 | [
[
"Bousso",
"Raphael",
""
],
[
"Linde",
"Andrei",
""
]
] | We propose two new classes of instantons which describe the tunneling and/or quantum creation of closed and open universes. The instantons leading to an open universe can be considered as generalizations of the Coleman-De-Luccia solution. They are non-singular, unlike the instantons recently studied by Hawking and Turo... |
1502.00971 | Magdalena Zych | Magdalena Zych, Caslav Brukner | Quantum formulation of the Einstein Equivalence Principle | 15 pages+appendices | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Validity of just a few physical conditions comprising the Einstein
Equivalence Principle (EEP) suffices to ensure that gravity can be understood
as space-time geometry. EEP is therefore subject to an ongoing experimental
verification, with present day tests reaching the regime where quantum
mechanics becomes relevant... | [
{
"created": "Tue, 3 Feb 2015 19:33:02 GMT",
"version": "v1"
}
] | 2015-02-04 | [
[
"Zych",
"Magdalena",
""
],
[
"Brukner",
"Caslav",
""
]
] | Validity of just a few physical conditions comprising the Einstein Equivalence Principle (EEP) suffices to ensure that gravity can be understood as space-time geometry. EEP is therefore subject to an ongoing experimental verification, with present day tests reaching the regime where quantum mechanics becomes relevant. ... |
gr-qc/9806023 | Mariusz Dabrowski | John D. Barrow and Mariusz P. Dabrowski | String Cosmology and Chaos | 10 pages, 1 ps figure, a contribution to the Conference Proceedings,
ISMC Potsdam, Germany, 30 March - 4 April 1998 | null | null | null | gr-qc astro-ph chao-dyn hep-th nlin.CD | null | We investigate Bianchi type IX ''Mixmaster'' universes within the framework
of the low-energy tree-level effective action for string theory, which (when
the ''stringy'' 2-form axion potential vanishes) is formally the same as the
Brans-Dicke action with $\omega =-1$. We show that, unlike the case of general
relativit... | [
{
"created": "Thu, 4 Jun 1998 11:55:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Barrow",
"John D.",
""
],
[
"Dabrowski",
"Mariusz P.",
""
]
] | We investigate Bianchi type IX ''Mixmaster'' universes within the framework of the low-energy tree-level effective action for string theory, which (when the ''stringy'' 2-form axion potential vanishes) is formally the same as the Brans-Dicke action with $\omega =-1$. We show that, unlike the case of general relativity ... |
1908.07400 | Christian Boehmer | Christian G. Boehmer, Peter A. Hogan | Models of light-like charges with non-geodesic world lines | 11 pages, 1 figure | Phys.Rev. D100 (2019) no.4, 044021 | 10.1103/PhysRevD.100.044021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Massless particles in General Relativity move with the speed of light, their
trajectories in spacetime are described by null geodesics. This is independent
of the electrical charge of the particle being considered, however, the charged
light-like case is less well understood. Starting with the Maxwell field of a
char... | [
{
"created": "Tue, 20 Aug 2019 14:44:19 GMT",
"version": "v1"
}
] | 2019-08-22 | [
[
"Boehmer",
"Christian G.",
""
],
[
"Hogan",
"Peter A.",
""
]
] | Massless particles in General Relativity move with the speed of light, their trajectories in spacetime are described by null geodesics. This is independent of the electrical charge of the particle being considered, however, the charged light-like case is less well understood. Starting with the Maxwell field of a charge... |
1705.06287 | Shahar Hod | Shahar Hod | A proof of the weak gravity conjecture | 7 pages. This essay is awarded 4th Prize in the 2017 Essay
Competition of the Gravity Research Foundation | International Journal of Modern Physics D 26, 1742004 (2017) | 10.1142/S0218271817420044 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The weak gravity conjecture suggests that, in a self-consistent theory of
quantum gravity, the strength of gravity is bounded from above by the strengths
of the various gauge forces in the theory. In particular, this intriguing
conjecture asserts that in a theory describing a U(1) gauge field coupled
consistently to ... | [
{
"created": "Wed, 17 May 2017 18:00:04 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Hod",
"Shahar",
""
]
] | The weak gravity conjecture suggests that, in a self-consistent theory of quantum gravity, the strength of gravity is bounded from above by the strengths of the various gauge forces in the theory. In particular, this intriguing conjecture asserts that in a theory describing a U(1) gauge field coupled consistently to gr... |
1109.2880 | Jos\'e Antonio Belinch\'on | J. A. Belinch\'on | Bianchi {VI}$_{0}$ in Scalar and Scalar-Tensor Cosmologies | Typos corrected. References added, minor corrections. arXiv admin
note: text overlap with arXiv:0905.2477 | null | 10.2478/s11534-012-0087-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study several cosmological models with Bianchi \textrm{VI}$_{0}$
symmetries under the self-similar approach. In order to study how the
\textquotedblleft constants\textquotedblright\ $G$ and $\Lambda$ may vary, we
propose three scenarios where such constants are considered as time functions.
The first model is a pe... | [
{
"created": "Tue, 13 Sep 2011 18:41:07 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Dec 2011 15:25:53 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Dec 2011 06:44:22 GMT",
"version": "v3"
}
] | 2015-05-30 | [
[
"Belinchón",
"J. A.",
""
]
] | We study several cosmological models with Bianchi \textrm{VI}$_{0}$ symmetries under the self-similar approach. In order to study how the \textquotedblleft constants\textquotedblright\ $G$ and $\Lambda$ may vary, we propose three scenarios where such constants are considered as time functions. The first model is a perf... |
1807.00213 | Majid Abdollahi Zadeh | M. Abdollahi Zadeh, A. Sheykhi | Ghost dark energy in the DGP braneworld | 14 pages, 18 figures | Advances in High Energy Physics, vol. 2018, Article ID 2514927, 10
pages, 2018 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the ghost model of dark energy in the framework of DGP
braneworld. We explore the cosmological consequences of this model by
determining the equation of state parameter, $\omega_D$, the deceleration and
the density parameters. We also examine the stability of this model by studying
the squared of the s... | [
{
"created": "Sat, 30 Jun 2018 18:01:32 GMT",
"version": "v1"
}
] | 2018-10-31 | [
[
"Zadeh",
"M. Abdollahi",
""
],
[
"Sheykhi",
"A.",
""
]
] | We investigate the ghost model of dark energy in the framework of DGP braneworld. We explore the cosmological consequences of this model by determining the equation of state parameter, $\omega_D$, the deceleration and the density parameters. We also examine the stability of this model by studying the squared of the sou... |
1005.3262 | Kirill Bronnikov | K.A. Bronnikov, M.V. Skvortsova, A.A. Starobinsky | Notes on wormhole existence in scalar-tensor and F(R) gravity | 7 two-column pages, no figures, to appear in Grav. Cosmol. A misprint
corrected, references updated | Grav.Cosmol.16:216-222,2010 | 10.1134/S0202289310030047 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Some recent papers have claimed the existence of static, spherically
symmetric wormhole solutions to gravitational field equations in the absence of
ghost (or phantom) degrees of freedom. We show that in some such cases the
solutions in question are actually not of wormhole nature while in cases where
a wormhole is o... | [
{
"created": "Tue, 18 May 2010 17:42:50 GMT",
"version": "v1"
},
{
"created": "Fri, 28 May 2010 10:54:21 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Jun 2010 17:09:54 GMT",
"version": "v3"
}
] | 2014-11-21 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Skvortsova",
"M. V.",
""
],
[
"Starobinsky",
"A. A.",
""
]
] | Some recent papers have claimed the existence of static, spherically symmetric wormhole solutions to gravitational field equations in the absence of ghost (or phantom) degrees of freedom. We show that in some such cases the solutions in question are actually not of wormhole nature while in cases where a wormhole is obt... |
0906.0889 | Koutarou Kyutoku | Koutarou Kyutoku, Masaru Shibata, Keisuke Taniguchi | Quasiequilibrium states of black hole-neutron star binaries in the
moving-puncture framework | 14 pages, 5 figures; minor revision | Phys. Rev. D 79, 124018 (2009) | 10.1103/PhysRevD.79.124018 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativistic quasiequilibrium states of black hole-neutron star
binaries are computed in the moving-puncture framework. We propose three
conditions for determining the quasiequilibrium states and compare the
numerical results with those obtained in the excision framework. We find that
the results obtained in ... | [
{
"created": "Thu, 4 Jun 2009 11:52:38 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jun 2009 13:44:16 GMT",
"version": "v2"
}
] | 2017-12-27 | [
[
"Kyutoku",
"Koutarou",
""
],
[
"Shibata",
"Masaru",
""
],
[
"Taniguchi",
"Keisuke",
""
]
] | General relativistic quasiequilibrium states of black hole-neutron star binaries are computed in the moving-puncture framework. We propose three conditions for determining the quasiequilibrium states and compare the numerical results with those obtained in the excision framework. We find that the results obtained in th... |
1103.0387 | Andr\'es Ace\~na | Andr\'es E. Ace\~na and Juan A. Valiente Kroon | Conformal extensions for stationary spacetimes | 34 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The construction of the cylinder at spatial infinity for stationary
spacetimes is considered. Using a specific conformal gauge and frame, it is
shown that the tensorial fields associated to the conformal Einstein field
equations admit expansions in a neighbourhood of the cylinder at spatial
infinity which are analyti... | [
{
"created": "Wed, 2 Mar 2011 10:26:11 GMT",
"version": "v1"
}
] | 2011-03-03 | [
[
"Aceña",
"Andrés E.",
""
],
[
"Kroon",
"Juan A. Valiente",
""
]
] | The construction of the cylinder at spatial infinity for stationary spacetimes is considered. Using a specific conformal gauge and frame, it is shown that the tensorial fields associated to the conformal Einstein field equations admit expansions in a neighbourhood of the cylinder at spatial infinity which are analytic ... |
2306.17435 | Sneha Pradhan | Sneha Pradhan, Debasmita Mohanty, P.K. Sahoo | Thin-Shell Gravastar Model in $f(Q,T)$ Gravity | Chinese Physics C published version | Chinese Physics C Vol. 47, No. 9 (2023) 095104 | 10.1088/1674-1137/ace311 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In the last few decades, gravastars have been proposed as an alternative to
black holes. The stability of the gravastar has been studied in many modified
theories of gravity along with Einstein's GR. The $f(Q,T)$ gravity, a
successfully modified theory of gravity for describing the current accelerated
expansion of th... | [
{
"created": "Fri, 30 Jun 2023 07:14:40 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Pradhan",
"Sneha",
""
],
[
"Mohanty",
"Debasmita",
""
],
[
"Sahoo",
"P. K.",
""
]
] | In the last few decades, gravastars have been proposed as an alternative to black holes. The stability of the gravastar has been studied in many modified theories of gravity along with Einstein's GR. The $f(Q,T)$ gravity, a successfully modified theory of gravity for describing the current accelerated expansion of the ... |
2404.04460 | Hui Tong | Hui Tong, Nir Guttman, Teagan A. Clarke, Paul D. Lasky, Eric Thrane,
Ethan Payne, Rowina Nathan, Ben Farr, Maya Fishbach, Gregory Ashton, and
Valentina Di Marco | Transdimensional inference for gravitational-wave astronomy with Bilby | 12 pages, 7 figures | null | null | LIGO DCC P2400105 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has become increasingly useful to answer questions in gravitational-wave
astronomy using transdimensional models where the number of free parameters can
be varied depending on the complexity required to fit the data. Given the
growing interest in transdimensional inference, we introduce a new package for
the Bayes... | [
{
"created": "Sat, 6 Apr 2024 01:06:25 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Apr 2024 02:43:15 GMT",
"version": "v2"
}
] | 2024-04-10 | [
[
"Tong",
"Hui",
""
],
[
"Guttman",
"Nir",
""
],
[
"Clarke",
"Teagan A.",
""
],
[
"Lasky",
"Paul D.",
""
],
[
"Thrane",
"Eric",
""
],
[
"Payne",
"Ethan",
""
],
[
"Nathan",
"Rowina",
""
],
[
"Farr",
... | It has become increasingly useful to answer questions in gravitational-wave astronomy using transdimensional models where the number of free parameters can be varied depending on the complexity required to fit the data. Given the growing interest in transdimensional inference, we introduce a new package for the Bayesia... |
0903.5080 | Parthasarathi Majumdar | Parthasarathi Majumdar | Holography, Gauge-Gravity Connection and Black Hole Entropy | 12 Pages Latex, 5 eps figures, based on invited talk given at the
PAQFT08 Conference held at Nanyang University, Singapore in November 2008 | Int.J.Mod.Phys.A24:3414-3425,2009 | 10.1142/S0217751X09047016 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The issues of holography and possible links with gauge theories in spacetime
physics is discussed, in an approach quite distinct from the more restricted
AdS-CFT correspondence. A particular notion of holography in the context of
black hole thermodynamics is derived (rather than conjectured) from rather
elementary co... | [
{
"created": "Sun, 29 Mar 2009 18:58:48 GMT",
"version": "v1"
}
] | 2009-08-20 | [
[
"Majumdar",
"Parthasarathi",
""
]
] | The issues of holography and possible links with gauge theories in spacetime physics is discussed, in an approach quite distinct from the more restricted AdS-CFT correspondence. A particular notion of holography in the context of black hole thermodynamics is derived (rather than conjectured) from rather elementary cons... |
gr-qc/9409034 | Robert Bruce Mann | J.S.F. Chan and R.B. Mann | Inside a Spinning Black String | 5 pgs., WATPHYS TH94/01 | Phys.Rev. D51 (1995) 5428-5430 | 10.1103/PhysRevD.51.5428 | null | gr-qc hep-th | null | We show that mass inflation occurs inside spinning black cosmic string, which
is a solution of a low-energy effective string theory in $(3+1)$-dimensions.
This confirms Poisson and Israel's conjecture that the inner mass parameter
diverges even if spacetime is not spherically symmetric.
| [
{
"created": "Fri, 16 Sep 1994 10:13:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Chan",
"J. S. F.",
""
],
[
"Mann",
"R. B.",
""
]
] | We show that mass inflation occurs inside spinning black cosmic string, which is a solution of a low-energy effective string theory in $(3+1)$-dimensions. This confirms Poisson and Israel's conjecture that the inner mass parameter diverges even if spacetime is not spherically symmetric. |
2209.00772 | Yi Pang | Yu-Peng Wang, Liang Ma and Yi Pang | Quantum Corrections to Pair Production of Charged Black Holes in de
Sitter Space | 30 pages, 2 figures | JCAP01(2023)007 | 10.1088/1475-7516/2023/01/007 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We compute Euclidean action of charged de Sitter black holes in four
dimensional gravitational Euler-Heisenberg model. It turns out that the action
of a general Euclidean dyonically charged black hole is still controlled by the
total entropy contributed by the black hole outer horizon and the cosmological
horizon. Fo... | [
{
"created": "Fri, 2 Sep 2022 01:24:21 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jan 2023 00:17:25 GMT",
"version": "v2"
}
] | 2023-01-12 | [
[
"Wang",
"Yu-Peng",
""
],
[
"Ma",
"Liang",
""
],
[
"Pang",
"Yi",
""
]
] | We compute Euclidean action of charged de Sitter black holes in four dimensional gravitational Euler-Heisenberg model. It turns out that the action of a general Euclidean dyonically charged black hole is still controlled by the total entropy contributed by the black hole outer horizon and the cosmological horizon. For ... |
gr-qc/0604008 | Chao-Guang Huang | Chao-Guang Huang and Han-Ying Guo | A New Kind of Uniformly Accelerated Reference Frames | 10 pages, 2 figures. to appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys. D15 (2006) 1035-1046 | 10.1142/S0218271806008711 | null | gr-qc | null | A new kind of uniformly accelerated reference frames with a line-element
different from the M{\o}ller and Rindler ones is presented, in which every
observer at $x, y, z=$consts. has the same constant acceleration. The laws of
mechanics are checked in the new kind of frames. Its thermal property is
studied. The compar... | [
{
"created": "Tue, 4 Apr 2006 06:44:50 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Huang",
"Chao-Guang",
""
],
[
"Guo",
"Han-Ying",
""
]
] | A new kind of uniformly accelerated reference frames with a line-element different from the M{\o}ller and Rindler ones is presented, in which every observer at $x, y, z=$consts. has the same constant acceleration. The laws of mechanics are checked in the new kind of frames. Its thermal property is studied. The comparis... |
1110.2485 | Carlos A. R. Herdeiro | Carlos Herdeiro, Marco O. P. Sampaio, Mengjie Wang | Hawking radiation for a Proca field in D-dimensions | 21 pages, 3 figures | null | 10.1103/PhysRevD.85.024005 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the wave equation of a massive vector boson in the background of a
D-dimensional Schwarzschild black hole. The mass term introduces a coupling
between two physical degrees of freedom of the field, and we solve the
resulting system of ODEs numerically, without decoupling. We show how to define
decoupled trans... | [
{
"created": "Tue, 11 Oct 2011 20:00:01 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Herdeiro",
"Carlos",
""
],
[
"Sampaio",
"Marco O. P.",
""
],
[
"Wang",
"Mengjie",
""
]
] | We study the wave equation of a massive vector boson in the background of a D-dimensional Schwarzschild black hole. The mass term introduces a coupling between two physical degrees of freedom of the field, and we solve the resulting system of ODEs numerically, without decoupling. We show how to define decoupled transmi... |
2404.01840 | Parthasarathi Majumdar | Tanmoy Chakraborty and Parthasarathi Majumdar | Particle Creation in a Linear Gravitational Wave Background | 6 pages revtex4-1, no figures, abstract changed, two sentences added.
New paragraph added in Introduction to delineate the distinction of the paper
from earlier work. Several new references added | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Inspired by the pioneering 1968 work of L Parker, demonstrating matter quanta
production in a dynamical spacetime background, we consider production of
scalar quanta in a gravitational wave background. Choosing the spacetime to be
a flat spacetime perturbed linearly by a linear gravitational wave, we show
that scalar... | [
{
"created": "Tue, 2 Apr 2024 10:59:01 GMT",
"version": "v1"
},
{
"created": "Wed, 8 May 2024 09:47:25 GMT",
"version": "v2"
}
] | 2024-05-09 | [
[
"Chakraborty",
"Tanmoy",
""
],
[
"Majumdar",
"Parthasarathi",
""
]
] | Inspired by the pioneering 1968 work of L Parker, demonstrating matter quanta production in a dynamical spacetime background, we consider production of scalar quanta in a gravitational wave background. Choosing the spacetime to be a flat spacetime perturbed linearly by a linear gravitational wave, we show that scalar p... |
gr-qc/0411112 | Lisa Lowe | J. David Brown and Lisa L. Lowe | Multigrid elliptic equation solver with adaptive mesh refinement | 12 pages, 9 figures, Modified in response to reviewer suggestions,
added figure, added references. Accepted for publication in J. Comp. Phys | J.Comput.Phys. 209 (2005) 582-598 | 10.1016/j.jcp.2005.03.026 | null | gr-qc | null | In this paper we describe in detail the computational algorithm used by our
parallel multigrid elliptic equation solver with adaptive mesh refinement. Our
code uses truncation error estimates to adaptively refine the grid as part of
the solution process. The presentation includes a discussion of the orders of
accurac... | [
{
"created": "Tue, 23 Nov 2004 17:30:55 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Mar 2005 16:38:54 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Brown",
"J. David",
""
],
[
"Lowe",
"Lisa L.",
""
]
] | In this paper we describe in detail the computational algorithm used by our parallel multigrid elliptic equation solver with adaptive mesh refinement. Our code uses truncation error estimates to adaptively refine the grid as part of the solution process. The presentation includes a discussion of the orders of accuracy ... |
gr-qc/9502040 | Eric Poisson | Eric Poisson and Clifford M. Will | Gravitational waves from inspiralling compact binaries: Parameter
estimation using second-post-Newtonian waveforms | 14 pages, ReVTeX | Phys.Rev.D52:848-855,1995 | 10.1103/PhysRevD.52.848 | WUGRAV-95-2 | gr-qc | null | The parameters of inspiralling compact binaries can be estimated using
matched filtering of gravitational-waveform templates against the output of
laser-interferometric gravitational-wave detectors. Using a recently calculated
formula, accurate to second post-Newtonian (2PN) order [order $(v/c)^4$, where
$v$ is the o... | [
{
"created": "Fri, 24 Feb 1995 18:41:45 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Poisson",
"Eric",
""
],
[
"Will",
"Clifford M.",
""
]
] | The parameters of inspiralling compact binaries can be estimated using matched filtering of gravitational-waveform templates against the output of laser-interferometric gravitational-wave detectors. Using a recently calculated formula, accurate to second post-Newtonian (2PN) order [order $(v/c)^4$, where $v$ is the orb... |
2109.04418 | Sergio Giardino | Sergio Giardino | A complementary covariant approach to gravito-electromagnetism | accept by Revista Mexicana de F\'isica | null | 10.31349/RevMexFis.68.010702 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | From a previous paper where we proposed a description of general relativity
within the gravito-electromagnetic limit, we propose an alternative modified
gravitational theory. As in the former version, we analyze the vector and
tensor equations of motion, the gravitational continuity equation, the
conservation of the ... | [
{
"created": "Thu, 9 Sep 2021 17:00:10 GMT",
"version": "v1"
}
] | 2022-05-03 | [
[
"Giardino",
"Sergio",
""
]
] | From a previous paper where we proposed a description of general relativity within the gravito-electromagnetic limit, we propose an alternative modified gravitational theory. As in the former version, we analyze the vector and tensor equations of motion, the gravitational continuity equation, the conservation of the en... |
gr-qc/0509116 | Duncan Brown | Bruce Allen, Warren G. Anderson, Patrick R. Brady, Duncan A. Brown,
Jolien D. E. Creighton | FINDCHIRP: an algorithm for detection of gravitational waves from
inspiraling compact binaries | 19 pages, 1 figure, journal version with Creative Commons 4.0
open-access license added | null | 10.1103/PhysRevD.85.122006 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Matched-filter searches for gravitational waves from coalescing compact
binaries by the LIGO Scientific Collaboration use the FINDCHIRP algorithm: an
implementation of the optimal filter with innovations to account for unknown
signal parameters and to improve performance on detector data that has
nonstationary and no... | [
{
"created": "Wed, 28 Sep 2005 22:31:43 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Aug 2011 08:14:33 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Sep 2017 17:05:33 GMT",
"version": "v3"
}
] | 2017-09-19 | [
[
"Allen",
"Bruce",
""
],
[
"Anderson",
"Warren G.",
""
],
[
"Brady",
"Patrick R.",
""
],
[
"Brown",
"Duncan A.",
""
],
[
"Creighton",
"Jolien D. E.",
""
]
] | Matched-filter searches for gravitational waves from coalescing compact binaries by the LIGO Scientific Collaboration use the FINDCHIRP algorithm: an implementation of the optimal filter with innovations to account for unknown signal parameters and to improve performance on detector data that has nonstationary and non-... |
1601.07552 | Vitor Cardoso | Vitor Cardoso, Jorge V. Rocha | Collapsing shells, critical phenomena and black hole formation | 5 pages, RevTex 4. v2: minor corrections. To appear in Physical
Review D | Phys. Rev. D 93, 084034 (2016) | 10.1103/PhysRevD.93.084034 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the gravitational collapse of two thin shells of matter, in
asymptotically flat spacetime or constrained to move within a spherical box. We
show that this simple two-body system has surprisingly rich dynamics, which
includes prompt collapse to a black hole, perpetually oscillating solutions or
black hole for... | [
{
"created": "Wed, 27 Jan 2016 21:00:03 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Apr 2016 15:07:00 GMT",
"version": "v2"
}
] | 2016-04-27 | [
[
"Cardoso",
"Vitor",
""
],
[
"Rocha",
"Jorge V.",
""
]
] | We study the gravitational collapse of two thin shells of matter, in asymptotically flat spacetime or constrained to move within a spherical box. We show that this simple two-body system has surprisingly rich dynamics, which includes prompt collapse to a black hole, perpetually oscillating solutions or black hole forma... |
2104.12283 | Francisco Lobo | Ana Rita Ribeiro, Daniele Vernieri, Francisco S. N. Lobo | Effective $f(R)$ actions for modified Loop Quantum Cosmologies via order
reduction | 16 pages, 4 figures. V2: typo corrected in caption of Fig.4a);
references added | Universe 2023, 9(4), 181 | 10.3390/universe9040181 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General Relativity is an extremely successful theory, at least for weak
gravitational fields, however, it breaks down at very high energies, such as in
correspondence of the initial singularity. Quantum Gravity is expected to
provide more physical insights concerning this open question. Indeed, one
alternative scenar... | [
{
"created": "Sun, 25 Apr 2021 22:53:20 GMT",
"version": "v1"
},
{
"created": "Tue, 4 May 2021 13:25:28 GMT",
"version": "v2"
}
] | 2023-04-20 | [
[
"Ribeiro",
"Ana Rita",
""
],
[
"Vernieri",
"Daniele",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | General Relativity is an extremely successful theory, at least for weak gravitational fields, however, it breaks down at very high energies, such as in correspondence of the initial singularity. Quantum Gravity is expected to provide more physical insights concerning this open question. Indeed, one alternative scenario... |
0704.1261 | Khireddine Nouicer | Khireddine Nouicer | Quantum-corrected black hole thermodynamics to all orders in the Planck
length | 20 pages, 4 figures, 2 tables, Latex | Phys.Lett.B646:63-71,2007 | 10.1016/j.physletb.2006.12.072 | null | gr-qc | null | We investigate the effects to all orders in the Planck length from a
generalized un- certainty principle (GUP) on black holes thermodynamics. We
calculate the corrected Hawking temperature, entropy, and examine in details
the Hawking evaporation process. As a result, the evaporation process is
accelerated and the eva... | [
{
"created": "Tue, 10 Apr 2007 15:24:15 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nouicer",
"Khireddine",
""
]
] | We investigate the effects to all orders in the Planck length from a generalized un- certainty principle (GUP) on black holes thermodynamics. We calculate the corrected Hawking temperature, entropy, and examine in details the Hawking evaporation process. As a result, the evaporation process is accelerated and the evapo... |
0906.1420 | Ryuichi Fujita | Ryuichi Fujita and Wataru Hikida | Analytical solutions of bound timelike geodesic orbits in Kerr spacetime | A typo in the first expression in equation 21 was fixed | Class. Quantum Grav. 26 (2009) 135002 | 10.1088/0264-9381/26/13/135002 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the analytical solutions of the bound timelike geodesic orbits in
Kerr spacetime. The analytical solutions are expressed in terms of the elliptic
integrals using Mino time $\lambda$ as the independent variable. Mino time
decouples the radial and polar motion of a particle and hence leads to forms
more usefu... | [
{
"created": "Mon, 8 Jun 2009 06:59:58 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Aug 2012 16:36:33 GMT",
"version": "v2"
}
] | 2012-08-28 | [
[
"Fujita",
"Ryuichi",
""
],
[
"Hikida",
"Wataru",
""
]
] | We derive the analytical solutions of the bound timelike geodesic orbits in Kerr spacetime. The analytical solutions are expressed in terms of the elliptic integrals using Mino time $\lambda$ as the independent variable. Mino time decouples the radial and polar motion of a particle and hence leads to forms more useful ... |
1208.4231 | Ernesto Nungesser | Ernesto Nungesser | Future non-linear stability for reflection symmetric solutions of the
Einstein-Vlasov system of Bianchi types II and VI$_0$ | 30 pages | Ann. Henri Poincare (2013), Volume 14, Issue 4, pp 967-999 | 10.1007/s00023-012-0201-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the methods developed for the Bianchi I case we have shown that a
boostrap argument is also suitable to treat the future non-linear stability for
reflection symmetric solutions of the Einstein-Vlasov system of Bianchi types
II and VI$_0$. These solutions are asymptotic to the Collins-Stewart solution
with dust ... | [
{
"created": "Tue, 21 Aug 2012 10:24:40 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Nungesser",
"Ernesto",
""
]
] | Using the methods developed for the Bianchi I case we have shown that a boostrap argument is also suitable to treat the future non-linear stability for reflection symmetric solutions of the Einstein-Vlasov system of Bianchi types II and VI$_0$. These solutions are asymptotic to the Collins-Stewart solution with dust an... |
gr-qc/0610047 | Peter Graham | Savas Dimopoulos, Peter W. Graham, Jason M. Hogan, Mark A. Kasevich | Testing General Relativity with Atom Interferometry | 4 pages, 1 figure; v2: Minor changes made for publication | Phys.Rev.Lett.98:111102,2007 | 10.1103/PhysRevLett.98.111102 | null | gr-qc astro-ph hep-ph hep-th physics.atom-ph | null | The unprecedented precision of atom interferometry will soon lead to
laboratory tests of general relativity to levels that will rival or exceed
those reached by astrophysical observations. We propose such an experiment that
will initially test the equivalence principle to 1 part in 10^15 (300 times
better than the cu... | [
{
"created": "Tue, 10 Oct 2006 18:03:28 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Mar 2007 01:05:59 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Dimopoulos",
"Savas",
""
],
[
"Graham",
"Peter W.",
""
],
[
"Hogan",
"Jason M.",
""
],
[
"Kasevich",
"Mark A.",
""
]
] | The unprecedented precision of atom interferometry will soon lead to laboratory tests of general relativity to levels that will rival or exceed those reached by astrophysical observations. We propose such an experiment that will initially test the equivalence principle to 1 part in 10^15 (300 times better than the curr... |
0711.0786 | Edwin J. Son | Wontae Kim, Edwin J. Son, Myungseok Yoon | Thermodynamics of a black hole based on a generalized uncertainty
principle | 12 pages, 4 figures; v2. to appear in JHEP | JHEP0801:035,2008 | 10.1088/1126-6708/2008/01/035 | null | gr-qc hep-th | null | We study thermodynamic quantities and the stability of a black hole in a
cavity using the Euclidean action formalism by Gibbons and Hawking based on the
generalized uncertainty relation which is extended in a symmetric way with
respect to the space and momentum without loss of generality. Two parameters in
the uncert... | [
{
"created": "Tue, 6 Nov 2007 01:42:24 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jan 2008 11:00:42 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Kim",
"Wontae",
""
],
[
"Son",
"Edwin J.",
""
],
[
"Yoon",
"Myungseok",
""
]
] | We study thermodynamic quantities and the stability of a black hole in a cavity using the Euclidean action formalism by Gibbons and Hawking based on the generalized uncertainty relation which is extended in a symmetric way with respect to the space and momentum without loss of generality. Two parameters in the uncertai... |
gr-qc/0309126 | Jiri Bicak | Jiri Bicak, Donald Lynden-Bell, and Joseph Katz | Do Rotations Beyond the Cosmological Horizon Affect the Local Inertial
Frame? | 12 pages | Phys.Rev. D69 (2004) 064011 | 10.1103/PhysRevD.69.064011 | null | gr-qc astro-ph | null | If perturbations beyond the horizon have the velocities prescribed everywhere
then the dragging of inertial frames near the origin is suppressed by an
exponential factor. However if perturbations are prescribed in terms of their
angular momenta there is no such suppression.
We resolve this paradox and in doing so g... | [
{
"created": "Fri, 26 Sep 2003 11:55:37 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Bicak",
"Jiri",
""
],
[
"Lynden-Bell",
"Donald",
""
],
[
"Katz",
"Joseph",
""
]
] | If perturbations beyond the horizon have the velocities prescribed everywhere then the dragging of inertial frames near the origin is suppressed by an exponential factor. However if perturbations are prescribed in terms of their angular momenta there is no such suppression. We resolve this paradox and in doing so give ... |
1707.02217 | Yi-Shi Duan | Yi-Shi Duan | General Covariant Equations for Fields of Arbitrary Spin | 4 pages. The general covariant field equations for arbitrary spin
were obtained In this paper. This is the foundation for a gauge theory of
gravitation. Therefore, this work is one of the earliest references to
explore gauge theories of gravitation | Soviet Physics JETP Vol 34(7), 632-636 (1958) | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To obtain a generalized wave equation for a field in general covariant form,
one must define covariant differentiation of a generalized wave function
describing particles with arbitrary spin. Gel'fand and Iaglom, Dirac, and Fierz
and Pauli have studied the generalized wave equation in the special theory of
relativity... | [
{
"created": "Wed, 24 May 2017 03:39:41 GMT",
"version": "v1"
}
] | 2017-07-10 | [
[
"Duan",
"Yi-Shi",
""
]
] | To obtain a generalized wave equation for a field in general covariant form, one must define covariant differentiation of a generalized wave function describing particles with arbitrary spin. Gel'fand and Iaglom, Dirac, and Fierz and Pauli have studied the generalized wave equation in the special theory of relativity. ... |
2005.08258 | Emmanuil Saridakis | Emmanuel N. Saridakis and Spyros Basilakos | The generalized second law of thermodynamics with Barrow entropy | 6 pages, 2 figures, version published in Eur.Phys.J.C | Eur.Phys.J.C 81 (2021) 7, 644 | 10.1140/epjc/s10052-021-09431-y | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the validity of the generalized second law of thermodynamics,
applying Barrow entropy for the horizon entropy. The former arises from the
fact that the black-hole surface may be deformed due to quantum-gravitational
effects, quantified by a new exponent $\Delta$. We calculate the entropy
time-variation... | [
{
"created": "Sun, 17 May 2020 14:17:20 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jun 2020 17:15:41 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Sep 2021 10:12:19 GMT",
"version": "v3"
}
] | 2021-09-16 | [
[
"Saridakis",
"Emmanuel N.",
""
],
[
"Basilakos",
"Spyros",
""
]
] | We investigate the validity of the generalized second law of thermodynamics, applying Barrow entropy for the horizon entropy. The former arises from the fact that the black-hole surface may be deformed due to quantum-gravitational effects, quantified by a new exponent $\Delta$. We calculate the entropy time-variation i... |
gr-qc/0210031 | Joshua T. Horwood | J. T. Horwood, M. J. Hancock, D. The, J. Wainwright | Late-time asymptotic dynamics of Bianchi VIII cosmologies | 22 pages, 3 figures, submitted to Class. Quantum Grav.; updated
references | Class.Quant.Grav. 20 (2003) 1757-1778 | 10.1088/0264-9381/20/9/312 | null | gr-qc | null | In this paper we give, for the first time, a complete description of the
late-time evolution of non-tilted spatially homogeneous cosmologies of Bianchi
type VIII. The source is assumed to be a perfect fluid with equation of state
$p = (\gamma - 1)\mu$, where $\gamma$ is a constant which satisfies $1 \leq
\gamma \leq ... | [
{
"created": "Thu, 10 Oct 2002 17:22:07 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Nov 2002 18:43:26 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Horwood",
"J. T.",
""
],
[
"Hancock",
"M. J.",
""
],
[
"The",
"D.",
""
],
[
"Wainwright",
"J.",
""
]
] | In this paper we give, for the first time, a complete description of the late-time evolution of non-tilted spatially homogeneous cosmologies of Bianchi type VIII. The source is assumed to be a perfect fluid with equation of state $p = (\gamma - 1)\mu$, where $\gamma$ is a constant which satisfies $1 \leq \gamma \leq 2$... |
2203.02755 | Haopeng Yan | Yehui Hou, Peng Liu, Minyong Guo, Haopeng Yan, Bin Chen | Multi-level images around Kerr-Newman black holes | Minor revisions. Version accepted for publication on CQG as a Special
Issue Article on the impact of EHT observations | null | 10.1088/1361-6382/ac8860 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | We study the lensing effects of Kerr-Newman (KN) black holes and the
multi-level images of luminous sources around the black holes. We obtain the
analytic forms of the lens equations in KN spacetime and derive approximately
their limiting forms for photon emissions near the bounded photon orbits. After
deriving the e... | [
{
"created": "Sat, 5 Mar 2022 14:19:18 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Aug 2022 09:45:25 GMT",
"version": "v2"
}
] | 2022-09-28 | [
[
"Hou",
"Yehui",
""
],
[
"Liu",
"Peng",
""
],
[
"Guo",
"Minyong",
""
],
[
"Yan",
"Haopeng",
""
],
[
"Chen",
"Bin",
""
]
] | We study the lensing effects of Kerr-Newman (KN) black holes and the multi-level images of luminous sources around the black holes. We obtain the analytic forms of the lens equations in KN spacetime and derive approximately their limiting forms for photon emissions near the bounded photon orbits. After deriving the exp... |
1801.04912 | Jose M. M. Senovilla | Jos\'e M. M. Senovilla | Singularity Theorems and Their Consequences | PDF file correcting an error in the bibliographical information that
appears in the journal's online version. 148 pages, 17 figures, 247
references. Review on singularities that was published in the GRG journal in
1998 | General Relativity and Gravitation, Vol.30, No. 5, pp.701--848,
1998 | 10.1023/A:1018801101244 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a 20-year old review on singularities and singularity theorems. The
main reason to submit it now is -apart from increasing its availability- to
correct a very strange error that appears in the journal's online version: it
contains wrong headers and footers in its 1st page. This has led to many wrong
citations... | [
{
"created": "Fri, 12 Jan 2018 15:17:11 GMT",
"version": "v1"
}
] | 2018-01-17 | [
[
"Senovilla",
"José M. M.",
""
]
] | This is a 20-year old review on singularities and singularity theorems. The main reason to submit it now is -apart from increasing its availability- to correct a very strange error that appears in the journal's online version: it contains wrong headers and footers in its 1st page. This has led to many wrong citations, ... |
1103.2927 | Philippe Spindel | Thibault Damour, Philippe Spindel | Quantum Einstein-Dirac Bianchi Universes | 50 pages | Phys.Rev.D83:123520,2011 | 10.1103/PhysRevD.83.123520 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the mini--superspace quantization of spatially homogeneous (Bianchi)
cosmological universes sourced by a Dirac spinor field. The quantization of the
homogeneous spinor leads to a finite-dimensional fermionic Hilbert space and
thereby to a multi-component Wheeler-DeWitt equation whose main features are:
(i) t... | [
{
"created": "Tue, 15 Mar 2011 14:54:52 GMT",
"version": "v1"
}
] | 2011-07-05 | [
[
"Damour",
"Thibault",
""
],
[
"Spindel",
"Philippe",
""
]
] | We study the mini--superspace quantization of spatially homogeneous (Bianchi) cosmological universes sourced by a Dirac spinor field. The quantization of the homogeneous spinor leads to a finite-dimensional fermionic Hilbert space and thereby to a multi-component Wheeler-DeWitt equation whose main features are: (i) the... |
1506.03307 | Shin'ichi Nojiri | S. Nojiri, S. D. Odintsov, V. K. Oikonomou | Singular inflation from generalized equation of state fluids | LaTeX 13 pages | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study models with a generalized inhomogeneous equation of state fluids, in
the context of singular inflation, focusing to so-called Type IV singular
evolution. In the simplest case, this cosmological fluid is described by an
equation of state with constant $w$, and therefore a direct modification of
this constant ... | [
{
"created": "Wed, 10 Jun 2015 13:54:28 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Nojiri",
"S.",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | We study models with a generalized inhomogeneous equation of state fluids, in the context of singular inflation, focusing to so-called Type IV singular evolution. In the simplest case, this cosmological fluid is described by an equation of state with constant $w$, and therefore a direct modification of this constant $w... |
1012.0087 | Muhammad Sharif | M. Sharif and Saira Waheed | Energy of Bardeen Model Using Approximate Symmetry Method | 14 pages, no figure, accepted for publication in Physica Scripta | Phys.Scripta 83:015014,2011 | 10.1088/0031-8949/83/01/015014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the energy problem in general relativity using
approximate Lie symmetry methods for differential equations. This procedure is
applied to Bardeen model (the regular black hole solution). Here we are forced
to evaluate the third-order approximate symmetries of the orbital and geodesic
equa... | [
{
"created": "Wed, 1 Dec 2010 03:02:12 GMT",
"version": "v1"
}
] | 2011-09-08 | [
[
"Sharif",
"M.",
""
],
[
"Waheed",
"Saira",
""
]
] | In this paper, we investigate the energy problem in general relativity using approximate Lie symmetry methods for differential equations. This procedure is applied to Bardeen model (the regular black hole solution). Here we are forced to evaluate the third-order approximate symmetries of the orbital and geodesic equati... |
1004.2681 | Spiros Cotsakis | J.D. Barrow, S. Cotsakis, A. Tsokaros | A General Sudden Cosmological Singularity | 15 pages, matches published version | Class.Quant.Grav.27:165017,2010 | 10.1088/0264-9381/27/16/165017 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct an asymptotic series for a general solution of the Einstein
equations near a sudden singularity. The solution is quasi isotropic and
contains nine independent arbitrary functions of the space coordinates as
required by the structure of the initial value problem.
| [
{
"created": "Thu, 15 Apr 2010 18:15:14 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jul 2010 07:58:42 GMT",
"version": "v2"
}
] | 2010-07-29 | [
[
"Barrow",
"J. D.",
""
],
[
"Cotsakis",
"S.",
""
],
[
"Tsokaros",
"A.",
""
]
] | We construct an asymptotic series for a general solution of the Einstein equations near a sudden singularity. The solution is quasi isotropic and contains nine independent arbitrary functions of the space coordinates as required by the structure of the initial value problem. |
1207.6145 | Huan Yang | Ting Hong, Huan Yang, Eric K. Gustafson, Rana X. Adhikari, and Yanbei
Chen | Brownian Thermal Noise in Multilayer Coated Mirrors | 26 pages, 18 figures | Phys. Rev. D 87, 082001, (2013) | 10.1103/PhysRevD.87.082001 | null | gr-qc physics.ins-det physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the Brownian thermal noise of a multi-layer dielectric coating,
used in high-precision optical measurements including interferometric
gravitational-wave detectors. We assume the coating material to be isotropic,
and therefore study thermal noises arising from shear and bulk losses of the
coating materials.... | [
{
"created": "Wed, 25 Jul 2012 23:47:31 GMT",
"version": "v1"
}
] | 2015-04-14 | [
[
"Hong",
"Ting",
""
],
[
"Yang",
"Huan",
""
],
[
"Gustafson",
"Eric K.",
""
],
[
"Adhikari",
"Rana X.",
""
],
[
"Chen",
"Yanbei",
""
]
] | We analyze the Brownian thermal noise of a multi-layer dielectric coating, used in high-precision optical measurements including interferometric gravitational-wave detectors. We assume the coating material to be isotropic, and therefore study thermal noises arising from shear and bulk losses of the coating materials. W... |
gr-qc/0411013 | Bianca Dittrich | B. Dittrich (Max Planck Institute, Potsdam and Perimeter Institute,
Waterloo) | Partial and Complete Observables for Hamiltonian Constrained Systems | 38 pages | Gen.Rel.Grav.39:1891-1927,2007 | 10.1007/s10714-007-0495-2 | AEI-2004-102 | gr-qc | null | We will pick up the concepts of partial and complete observables introduced
by Rovelli in order to construct Dirac observables in gauge systems. We will
generalize these ideas to an arbitrary number of gauge degrees of freedom.
Different methods to calculate such Dirac observables are developed. For
background indepe... | [
{
"created": "Tue, 2 Nov 2004 14:32:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Dittrich",
"B.",
"",
"Max Planck Institute, Potsdam and Perimeter Institute,\n Waterloo"
]
] | We will pick up the concepts of partial and complete observables introduced by Rovelli in order to construct Dirac observables in gauge systems. We will generalize these ideas to an arbitrary number of gauge degrees of freedom. Different methods to calculate such Dirac observables are developed. For background independ... |
1306.0861 | Emanuele Alesci | Emanuele Alesci, Klaus Liegener, Antonia Zipfel | Matrix Elements of Lorentzian Hamiltonian Constraint in LQG | 36 pages, minor typos corrected | Phys. Rev. D 88, 084043 (2013) | 10.1103/PhysRevD.88.084043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hamiltonian constraint is the key element of the canonical formulation of
LQG coding its dynamics. In Ashtekar-Barbero variables it naturally splits into
the so called Euclidean and Lorentzian parts. However, due to the high
complexity of this operator, only the matrix elements of the Euclidean part
have been con... | [
{
"created": "Tue, 4 Jun 2013 17:44:49 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jul 2013 21:25:01 GMT",
"version": "v2"
}
] | 2013-10-30 | [
[
"Alesci",
"Emanuele",
""
],
[
"Liegener",
"Klaus",
""
],
[
"Zipfel",
"Antonia",
""
]
] | The Hamiltonian constraint is the key element of the canonical formulation of LQG coding its dynamics. In Ashtekar-Barbero variables it naturally splits into the so called Euclidean and Lorentzian parts. However, due to the high complexity of this operator, only the matrix elements of the Euclidean part have been consi... |
gr-qc/0610080 | Masoud Alimohammadi | H. Mohseni Sadjadi and M. Alimohammadi | Cosmological coincidence problem in interacting dark energy models | 15 pages, LaTeX. Some minor explanations are added. To be published
in Phys. Rev. D | Phys.Rev.D74:103007,2006 | 10.1103/PhysRevD.74.103007 | null | gr-qc astro-ph hep-th | null | An interacting dark energy model with interaction term $Q= \lambda_m
H\rho_m+\lambda_dH\rho_d$ is considered. By studying the model near the
transition time, in which the system crosses the w=-1 phantom-divide-line, the
conditions needed to overcome the coincidence problem is investigated. The
phantom model, as a can... | [
{
"created": "Mon, 16 Oct 2006 11:58:26 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Nov 2006 06:13:14 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Sadjadi",
"H. Mohseni",
""
],
[
"Alimohammadi",
"M.",
""
]
] | An interacting dark energy model with interaction term $Q= \lambda_m H\rho_m+\lambda_dH\rho_d$ is considered. By studying the model near the transition time, in which the system crosses the w=-1 phantom-divide-line, the conditions needed to overcome the coincidence problem is investigated. The phantom model, as a candi... |
2311.15978 | Marta Colleoni | Marta Colleoni, Felip A. Ramis Vidal, Nathan K. Johnson-McDaniel, Tim
Dietrich, Maria Haney, Geraint Pratten | IMRPhenomXP_NRTidalv2: An improved frequency-domain precessing binary
neutron star waveform model | 19 pages, 16 figures | null | null | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present two new frequency-domain gravitational waveform models for the
analysis of signals emitted by binary neutron star coalescences:
IMRPhenomXAS_NRTidalv2 and IMRPhenomXP_NRTidalv2. Both models are available
through the public algorithm library LALSuite and represent the first
extensions of IMRPhenomX models i... | [
{
"created": "Mon, 27 Nov 2023 16:24:24 GMT",
"version": "v1"
}
] | 2023-11-28 | [
[
"Colleoni",
"Marta",
""
],
[
"Vidal",
"Felip A. Ramis",
""
],
[
"Johnson-McDaniel",
"Nathan K.",
""
],
[
"Dietrich",
"Tim",
""
],
[
"Haney",
"Maria",
""
],
[
"Pratten",
"Geraint",
""
]
] | We present two new frequency-domain gravitational waveform models for the analysis of signals emitted by binary neutron star coalescences: IMRPhenomXAS_NRTidalv2 and IMRPhenomXP_NRTidalv2. Both models are available through the public algorithm library LALSuite and represent the first extensions of IMRPhenomX models inc... |
2312.03810 | Gabriel Le\'on Ph.D. | Maria Pia Piccirilli and Gabriel Leon | Observational constraints on the second-order primordial power spectrum:
Exploring a Continuous Spontaneous Localization inspired inflationary model | 30 pages, 9 figures, 3 tables. This version corresponds largely to
the accepted version in Phys. of the Dark Univ | null | 10.1016/j.dark.2023.101390 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Inflation, a period of exponential expansion in the early Universe, is
considered an important part of the standard $\Lambda$CDM cosmological model,
and plays a crucial role in explaining a wide range of current observations.
The standard inflationary model predicts a primordial spectrum of fluctuations
that is nearl... | [
{
"created": "Wed, 6 Dec 2023 18:06:06 GMT",
"version": "v1"
}
] | 2023-12-08 | [
[
"Piccirilli",
"Maria Pia",
""
],
[
"Leon",
"Gabriel",
""
]
] | Inflation, a period of exponential expansion in the early Universe, is considered an important part of the standard $\Lambda$CDM cosmological model, and plays a crucial role in explaining a wide range of current observations. The standard inflationary model predicts a primordial spectrum of fluctuations that is nearly ... |
2404.11217 | Wen-Di Guo | Qin Tan, Yi Zhong, and Wen-Di Guo | Quasibound and quasinormal modes of a thick brane in Rastall gravity | 10 pages, 6 figures, and 1 table | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the gravitational quasinormal modes of the thick brane
in Rastall gravity. Using the asymptotic iteration and direct integration
methods, we solve the quasinormal frequencies of the Rastall thick brane. We
also obtained the waveforms of these quasinormal modes through numerical
evolution. The r... | [
{
"created": "Wed, 17 Apr 2024 10:01:44 GMT",
"version": "v1"
}
] | 2024-04-18 | [
[
"Tan",
"Qin",
""
],
[
"Zhong",
"Yi",
""
],
[
"Guo",
"Wen-Di",
""
]
] | In this work, we study the gravitational quasinormal modes of the thick brane in Rastall gravity. Using the asymptotic iteration and direct integration methods, we solve the quasinormal frequencies of the Rastall thick brane. We also obtained the waveforms of these quasinormal modes through numerical evolution. The res... |
gr-qc/0608004 | Mohammad Vahid Takook | T. Garidi, J-P. Gazeau, S. Rouhani and M.V. Takook | "Massless" vector field in de Sitter Universe | 33 pages, 3 figures | J.Math.Phys.49:032501,2008 | 10.1063/1.2841327 | null | gr-qc | null | In the present work the massless vector field in the de Sitter (dS) space has
been quantized. "Massless" is used here by reference to conformal invariance
and propagation on the dS light-cone whereas "massive" refers to those dS
fields which contract at zero curvature unambiguously to massive fields in
Minkowski spac... | [
{
"created": "Mon, 31 Jul 2006 22:59:50 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Garidi",
"T.",
""
],
[
"Gazeau",
"J-P.",
""
],
[
"Rouhani",
"S.",
""
],
[
"Takook",
"M. V.",
""
]
] | In the present work the massless vector field in the de Sitter (dS) space has been quantized. "Massless" is used here by reference to conformal invariance and propagation on the dS light-cone whereas "massive" refers to those dS fields which contract at zero curvature unambiguously to massive fields in Minkowski space.... |
1612.08451 | Vladimir Ivashchuk | K. K. Ernazarov and V. D. Ivashchuk | Stable exponential cosmological solutions with zero variation of G in
the Einstein-Gauss-Bonnet model with a Lambda-term | 14 pages, 2 figures, LaTex., 2nd revised version, several words and
phrases are changed or added, eq. (3.1) is modified, Remark on p. 4 is
inserted. To be published in Eur. Phys. J. C. arXiv admin note: substantial
text overlap with arXiv:1612.07178 | null | 10.1140/epjc/s10052-017-4669-0 | IGC-RUDN-2016-12-2cor2 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A D-dimensional gravitational model with a Gauss-Bonnet term and the
cosmological term Lambda is considered. By assuming diagonal cosmological
metrics, we find, for certain fine-tuned Lambda, a class of solutions with
exponential time dependence of two scale factors, governed by two Hubble-like
parameters H >0 and h ... | [
{
"created": "Mon, 26 Dec 2016 22:27:35 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 2017 21:52:05 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Jan 2017 21:58:39 GMT",
"version": "v3"
}
] | 2017-03-08 | [
[
"Ernazarov",
"K. K.",
""
],
[
"Ivashchuk",
"V. D.",
""
]
] | A D-dimensional gravitational model with a Gauss-Bonnet term and the cosmological term Lambda is considered. By assuming diagonal cosmological metrics, we find, for certain fine-tuned Lambda, a class of solutions with exponential time dependence of two scale factors, governed by two Hubble-like parameters H >0 and h < ... |
1612.00978 | Ryuichi Fujita | Ryuichi Fujita, Vitor Cardoso | Ultralight scalars and resonances in black-hole physics | 10 pages, 5 figures | Phys. Rev. D 95, 044016 (2017) | 10.1103/PhysRevD.95.044016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultralight degrees of freedom coupled to matter lead to resonances, which can
be excited when the Compton wavelength of the field equals a dynamical scale in
the problem. For binaries composed of a star orbiting a supermassive black
hole, these resonances lead to a smoking-gun effect: a periastron distance
which {\it... | [
{
"created": "Sat, 3 Dec 2016 16:08:08 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Feb 2017 19:24:47 GMT",
"version": "v2"
}
] | 2017-02-17 | [
[
"Fujita",
"Ryuichi",
""
],
[
"Cardoso",
"Vitor",
""
]
] | Ultralight degrees of freedom coupled to matter lead to resonances, which can be excited when the Compton wavelength of the field equals a dynamical scale in the problem. For binaries composed of a star orbiting a supermassive black hole, these resonances lead to a smoking-gun effect: a periastron distance which {\it s... |
2309.07465 | Supriya Pan | Jaume de Haro, Shin'ichi Nojiri, S. D. Odintsov, V. K. Oikonomou,
Supriya Pan | Finite-time Cosmological Singularities and the Possible Fate of the
Universe | Invited Review Article from Physics Reports; Published version; 138
pages including 7 tables, 1 figure and the references | Physics Reports, 1034 (2023) 1-114 | 10.1016/j.physrep.2023.09.003 | null | gr-qc astro-ph.CO hep-ph hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | Singularities in any physical theory are either remarkable indicators of the
unknown underlying fundamental theory, or indicate a change in the description
of the physical reality. In General Relativity there are three fundamental
kinds of singularities that might occur, firstly the black hole spacelike
crushing sing... | [
{
"created": "Thu, 14 Sep 2023 06:46:37 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Oct 2023 17:27:15 GMT",
"version": "v2"
}
] | 2023-10-03 | [
[
"de Haro",
"Jaume",
""
],
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
],
[
"Pan",
"Supriya",
""
]
] | Singularities in any physical theory are either remarkable indicators of the unknown underlying fundamental theory, or indicate a change in the description of the physical reality. In General Relativity there are three fundamental kinds of singularities that might occur, firstly the black hole spacelike crushing singul... |
gr-qc/9702017 | Steve Carlip | Steven Carlip | Statistical Mechanics and Black Hole Thermodynamics | 5 pages, LaTeX, uses espcrc2.sty; talk given at the Second Meeting on
Constrained Dynamics and Quantum Gravity, Santa Margherita Ligure, Italy,
September 1996 | Nucl.Phys.Proc.Suppl.57:8-12,1997 | 10.1016/S0920-5632(97)00348-4 | null | gr-qc | null | Black holes are thermodynamic objects, but despite recent progress, the
ultimate statistical mechanical origin of black hole temperature and entropy
remains mysterious. Here I summarize an approach in which the entropy is viewed
as arising from ``would-be pure gauge'' degrees of freedom that become
dynamical at the h... | [
{
"created": "Sat, 8 Feb 1997 00:45:23 GMT",
"version": "v1"
}
] | 2010-04-28 | [
[
"Carlip",
"Steven",
""
]
] | Black holes are thermodynamic objects, but despite recent progress, the ultimate statistical mechanical origin of black hole temperature and entropy remains mysterious. Here I summarize an approach in which the entropy is viewed as arising from ``would-be pure gauge'' degrees of freedom that become dynamical at the hor... |
2108.01307 | Bibhas Majhi Ranjan | Bibhas Ranjan Majhi | Shock wave quantum memory in shocked detector | Latex, 6 pages, 2 figures, to appear in Mod. Phys. Lett. A | Modern Physics Letters A Vol. 36, No. 26, 2150186 (2021) | 10.1142/S0217732321501868 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Usual uniformly accelerated frame, in Dray-'t Hooft spacetime, does not see
the any quantum imprint on Unruh effect due to localised shock wave in
Minkowski spacetime. Here we argue that such non-appearance of quantum memory
is specific to those particular observers which do not incorporate the presence
of wave in th... | [
{
"created": "Tue, 3 Aug 2021 05:49:38 GMT",
"version": "v1"
}
] | 2021-11-11 | [
[
"Majhi",
"Bibhas Ranjan",
""
]
] | Usual uniformly accelerated frame, in Dray-'t Hooft spacetime, does not see the any quantum imprint on Unruh effect due to localised shock wave in Minkowski spacetime. Here we argue that such non-appearance of quantum memory is specific to those particular observers which do not incorporate the presence of wave in thei... |
1706.08145 | Supriya Pan | Anadijiban Das, Asit Banerjee, Subenoy Chakraborty, Supriya Pan | Perfect Fluid Cosmological Universes: One equation of state and the most
general solution | 8 pages; no figures; some typos corrected; some references are added;
published version in Pramana - Journal of Physics | Pramana - J. Phys. 90 (2018) no.2, 19 | 10.1007/s12043-017-1511-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering a homogeneous and isotropic universe characterized by the
Friedmann-Lema\^itre-Robertson-Walker (FLRW) line element, in this work, we
have prescribed a general formalism for the cosmological solutions when the
equation of state of the cosmic substance follows a general structure $\phi (p,
\rho) = 0$, wher... | [
{
"created": "Sun, 25 Jun 2017 17:44:23 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2018 13:24:40 GMT",
"version": "v2"
}
] | 2018-01-10 | [
[
"Das",
"Anadijiban",
""
],
[
"Banerjee",
"Asit",
""
],
[
"Chakraborty",
"Subenoy",
""
],
[
"Pan",
"Supriya",
""
]
] | Considering a homogeneous and isotropic universe characterized by the Friedmann-Lema\^itre-Robertson-Walker (FLRW) line element, in this work, we have prescribed a general formalism for the cosmological solutions when the equation of state of the cosmic substance follows a general structure $\phi (p, \rho) = 0$, where ... |
2105.14324 | P. S. Negi | P S Negi | Analytic Core Envelope Models for the Crab and the Vela Pulsars | 24 pages, 7 figures | Astrophysice and Space Science 364, 149 (2019) | 10.1007/s10509-019-3638-5 | null | gr-qc astro-ph.HE | http://creativecommons.org/publicdomain/zero/1.0/ | We study analytic core-envelope models obtained in Negi et al. (1989) under
slow rotation. We have regarded in the present study, the lower bound on the
estimate of moment of inertia of the Crab pulsar, $I_{\rm Crab,45} \geq 2$
(where $I_{45}=I/10^{45}\rm g{cm}^2$) obtained by Gunn and Ostriker (1969) as a
round off ... | [
{
"created": "Sat, 29 May 2021 15:08:48 GMT",
"version": "v1"
}
] | 2021-06-01 | [
[
"Negi",
"P S",
""
]
] | We study analytic core-envelope models obtained in Negi et al. (1989) under slow rotation. We have regarded in the present study, the lower bound on the estimate of moment of inertia of the Crab pulsar, $I_{\rm Crab,45} \geq 2$ (where $I_{45}=I/10^{45}\rm g{cm}^2$) obtained by Gunn and Ostriker (1969) as a round off va... |
1307.8150 | Zbigniew Haba | Z. Haba | Einstein gravity of a diffusing fluid | 27 pages, corrected journal version | Class.Quantum Grav.31(2014)075011 | 10.1088/0264-9381/31/7/075011 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss Einstein gravity for a fluid consisting of particles interacting
with an unidentified environment of some other particles whose dissipative
effect is approximated by a diffusion. The environment is described by a time
dependent cosmological term which is compensating the lack of the conservation
law of the... | [
{
"created": "Tue, 30 Jul 2013 21:10:48 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Mar 2014 09:28:21 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Haba",
"Z.",
""
]
] | We discuss Einstein gravity for a fluid consisting of particles interacting with an unidentified environment of some other particles whose dissipative effect is approximated by a diffusion. The environment is described by a time dependent cosmological term which is compensating the lack of the conservation law of the e... |
gr-qc/0612148 | Giovanni Marozzi Dr. | G. Marozzi | Back-reaction of Cosmological Fluctuations during Power-Law Inflation | 9 pages, no figures, revtex. Some changes made, comments and
references added, conclusions unchanged, version accepted for pubblication in
Phys. Rev. D | Phys.Rev.D76:043504,2007 | 10.1103/PhysRevD.76.043504 | null | gr-qc astro-ph hep-th | null | We study the renormalized energy-momentum tensor of cosmological scalar
fluctuations during the slow-rollover regime for power-law inflation and find
that it is characterized by a negative energy density at the leading order,
with the same time behaviour as the background energy. The average expansion
rate appears de... | [
{
"created": "Fri, 22 Dec 2006 19:43:04 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jul 2007 17:42:28 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Aug 2007 09:54:21 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Marozzi",
"G.",
""
]
] | We study the renormalized energy-momentum tensor of cosmological scalar fluctuations during the slow-rollover regime for power-law inflation and find that it is characterized by a negative energy density at the leading order, with the same time behaviour as the background energy. The average expansion rate appears decr... |
gr-qc/0403092 | William Komp | Gonzalo J. Olmo, William Komp | Nonlinear Gravity Theories in the Metric and Palatini Formalisms | 16 pages | null | null | null | gr-qc | null | We study nonlinear gravity theories in both the metric and the Palatini
(metric-affine) formalisms. The nonlinear character of the gravity lagrangian
in the metric formalism causes the appearance of a scalar source of matter in
Einstein's equations that can be interpreted as a quintessence field. However,
in the Pala... | [
{
"created": "Mon, 22 Mar 2004 22:52:59 GMT",
"version": "v1"
},
{
"created": "Mon, 3 May 2004 19:13:04 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Olmo",
"Gonzalo J.",
""
],
[
"Komp",
"William",
""
]
] | We study nonlinear gravity theories in both the metric and the Palatini (metric-affine) formalisms. The nonlinear character of the gravity lagrangian in the metric formalism causes the appearance of a scalar source of matter in Einstein's equations that can be interpreted as a quintessence field. However, in the Palati... |
0710.3923 | Mark Israelit | Mark Israelit (University of Haifa - Oranim) | Creation of fundamental particles in Wesson's IMT | 29 pages. Submitted for publication in the Gen. Rel. and Grav.
Journal | Gen.Rel.Grav.40:2469-2492,2008 | 10.1007/s10714-008-0633-5 | null | gr-qc | null | Fundamental particles, regarded as the constituents of quarks and leptons,
are described classicaly in the framework of the Weyl-Dirac version of Wesson's
Induced Matter Theory. There are neutral particles and particles having charge
Q=+/-(1/3e). The particles appear on the 4D brane, our universe, and are filled
with... | [
{
"created": "Sun, 21 Oct 2007 11:37:59 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Israelit",
"Mark",
"",
"University of Haifa - Oranim"
]
] | Fundamental particles, regarded as the constituents of quarks and leptons, are described classicaly in the framework of the Weyl-Dirac version of Wesson's Induced Matter Theory. There are neutral particles and particles having charge Q=+/-(1/3e). The particles appear on the 4D brane, our universe, and are filled with a... |
1304.0836 | Masoud Allahverdizadeh | Masoud Allahverdizadeh, Seyed H. Hendi, Jos\'e P. S. Lemos, Ahmad
Sheykhi | Extremal Myers-Perry black holes coupled to Born-Infeld electrodynamics
in odd dimensions | 12 pages, 2 figures | Int.J.Mod.Phys. D Vol. 23, No. 4 (2014) 1450032 | 10.1142/S0218271814500321 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Employing higher order perturbation theory, we find a new class of
perturbative extremal rotating black hole solutions with Born-Infeld electric
charge in odd D-dimensional spacetime. The seed solution is an odd dimensional
extremal Myers-Perry black hole with equal angular momenta to which a
perturbative nonlinear e... | [
{
"created": "Wed, 3 Apr 2013 03:53:45 GMT",
"version": "v1"
}
] | 2014-03-21 | [
[
"Allahverdizadeh",
"Masoud",
""
],
[
"Hendi",
"Seyed H.",
""
],
[
"Lemos",
"José P. S.",
""
],
[
"Sheykhi",
"Ahmad",
""
]
] | Employing higher order perturbation theory, we find a new class of perturbative extremal rotating black hole solutions with Born-Infeld electric charge in odd D-dimensional spacetime. The seed solution is an odd dimensional extremal Myers-Perry black hole with equal angular momenta to which a perturbative nonlinear ele... |
1510.03538 | Kentaro Tomoda | Tsuyoshi Houri, Yoshiyuki Morisawa and Kentaro Tomoda | Antisymmetric tensor generalizations of affine vector fields | 9 pages. Some types are corrected. to be published in JMP | J. Math. Phys. 57, 022501 (2016) | 10.1063/1.4939185 | KOBE-TH-15-10 | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tensor generalizations of affine vector fields called symmetric and
antisymmetric affine tensor fields are discussed as symmetry of spacetimes. We
review the properties of the symmetric ones, which have been studied in earlier
works, and investigate the properties of the antisymmetric ones, which are the
main theme i... | [
{
"created": "Tue, 13 Oct 2015 05:48:58 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Dec 2015 08:01:07 GMT",
"version": "v2"
}
] | 2016-01-11 | [
[
"Houri",
"Tsuyoshi",
""
],
[
"Morisawa",
"Yoshiyuki",
""
],
[
"Tomoda",
"Kentaro",
""
]
] | Tensor generalizations of affine vector fields called symmetric and antisymmetric affine tensor fields are discussed as symmetry of spacetimes. We review the properties of the symmetric ones, which have been studied in earlier works, and investigate the properties of the antisymmetric ones, which are the main theme in ... |
2101.04515 | Ali \"Ovg\"un Dr. | Wajiha Javed, Ali Hamza and Ali \"Ovg\"un | Weak deflection angle by Casimir wormhole using Gauss-bonnet theorem and
its shadow | Accepted for publication in Modern Physics Letters A | Mod.Phys.Lett.A. 35, 39, 2050322 (2020) | 10.1142/S0217732320503228 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we calculate the weak deflection angle by Casimir wormhole and
its shadow. To do so, we derive the Gaussian optical curvature and use the
Gauss-Bonnet theorem. Then we find the deflection angle by Casimir wormhole in
weak field limits. Moreover, we obtain the weak deflection angle in the
presence of pl... | [
{
"created": "Sun, 10 Jan 2021 12:46:44 GMT",
"version": "v1"
}
] | 2021-01-13 | [
[
"Javed",
"Wajiha",
""
],
[
"Hamza",
"Ali",
""
],
[
"Övgün",
"Ali",
""
]
] | In this paper, we calculate the weak deflection angle by Casimir wormhole and its shadow. To do so, we derive the Gaussian optical curvature and use the Gauss-Bonnet theorem. Then we find the deflection angle by Casimir wormhole in weak field limits. Moreover, we obtain the weak deflection angle in the presence of plas... |
2301.12418 | Valle Varo | Valle Varo | The Covariant Phase Space of Gravity with Boundaries | PhD thesis | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by-nc-nd/4.0/ | This thesis investigates how the metric and tetrad formulations of three
gravitational field theories in manifolds with timelike boundaries within the
covariant phase space program. With the recently developed relative bicomplex
framework, we explore the space of solutions and presymplectic structures
associated with... | [
{
"created": "Sun, 29 Jan 2023 10:56:07 GMT",
"version": "v1"
}
] | 2023-01-31 | [
[
"Varo",
"Valle",
""
]
] | This thesis investigates how the metric and tetrad formulations of three gravitational field theories in manifolds with timelike boundaries within the covariant phase space program. With the recently developed relative bicomplex framework, we explore the space of solutions and presymplectic structures associated with e... |
gr-qc/0405141 | Saulo Carneiro | S. Carneiro and J.A.S. Lima | Decaying Lambda cosmology, varying G and holography | Minor changes. A short version will appear in the Int. J. Mod. Phys.
A (Proceedings of the Sixth Alexander Friedmann International Seminar on
Gravitation and Cosmology, Cargese, 2004) | Int.J.Mod.Phys.A20:2465-2469,2005 | 10.1142/S0217751X0502478X | null | gr-qc astro-ph | null | We discuss a class of uniform and isotropic, spatially flat, decaying Lambda
cosmologies, in the realm of a model where the gravitation constant G is a
function of the cosmological time. Besides the usual de Sitter solution, the
models at late times are characterized by a constant ratio between the matter
and total e... | [
{
"created": "Fri, 28 May 2004 18:42:56 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Mar 2005 20:04:10 GMT",
"version": "v2"
},
{
"created": "Sat, 5 Mar 2005 03:59:04 GMT",
"version": "v3"
}
] | 2010-03-19 | [
[
"Carneiro",
"S.",
""
],
[
"Lima",
"J. A. S.",
""
]
] | We discuss a class of uniform and isotropic, spatially flat, decaying Lambda cosmologies, in the realm of a model where the gravitation constant G is a function of the cosmological time. Besides the usual de Sitter solution, the models at late times are characterized by a constant ratio between the matter and total ene... |
1301.3628 | Torsten Asselmeyer-Maluga | T. Asselmeyer-Maluga and J. Krol | On the origin of inflation by using exotic smoothness | PDFLateX, ReVTeX4 style, 28 pages, 9 figures | null | null | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we discuss a spacetime having the topology of S^3 x R but with
a different smoothness structure leading to a geometric model for inflation,
called geometric inflation. In particular this spacetime is not globally
hyperbolic and we obtain a time line with a spatial topology change from the
3-sphere to a ... | [
{
"created": "Wed, 16 Jan 2013 08:45:10 GMT",
"version": "v1"
}
] | 2013-01-17 | [
[
"Asselmeyer-Maluga",
"T.",
""
],
[
"Krol",
"J.",
""
]
] | In this paper we discuss a spacetime having the topology of S^3 x R but with a different smoothness structure leading to a geometric model for inflation, called geometric inflation. In particular this spacetime is not globally hyperbolic and we obtain a time line with a spatial topology change from the 3-sphere to a ho... |
gr-qc/9908027 | Masaru shibata | Masaru Shibata (UIUC & Osaka) | Fully general relativistic simulation of coalescing binary neutron
stars: Preparatory tests | 36 pages, to be published in PRD 15, erase unnecessary figures | Phys.Rev. D60 (1999) 104052 | 10.1103/PhysRevD.60.104052 | null | gr-qc astro-ph | null | We present our first successful numerical results of 3D general relativistic
simulations in which the Einstein equation as well as the hydrodynamic
equations are fully solved. This paper is especially devoted to simulations of
test problems such as spherical dust collapse, stability test of perturbed
spherical stars,... | [
{
"created": "Mon, 9 Aug 1999 18:37:36 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Aug 1999 20:20:28 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Shibata",
"Masaru",
"",
"UIUC & Osaka"
]
] | We present our first successful numerical results of 3D general relativistic simulations in which the Einstein equation as well as the hydrodynamic equations are fully solved. This paper is especially devoted to simulations of test problems such as spherical dust collapse, stability test of perturbed spherical stars, a... |
1108.0859 | Hao Wei | Hao Wei, Hao-Yu Qi, Xiao-Peng Ma | Constraining $f(T)$ Theories with the Varying Gravitational Constant | 10 pages, 2 tables, 2 figures, revtex4; v2: discussions added, Eur.
Phys. J. C in press; v3: published version. arXiv admin note: text overlap
with arXiv:1106.0102 | Eur.Phys.J.C72:2117,2012 | 10.1140/epjc/s10052-012-2117-8 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As is well known, a varying effective gravitational "constant" is one of the
common features of most modified gravity theories. Of course, as a modified
gravity theory, $f(T)$ theory is not an exception. Noting that the
observational constraint on the varying gravitational "constant" is very tight,
in the present wor... | [
{
"created": "Wed, 3 Aug 2011 15:00:00 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Aug 2012 18:00:00 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Aug 2012 00:50:00 GMT",
"version": "v3"
}
] | 2012-08-31 | [
[
"Wei",
"Hao",
""
],
[
"Qi",
"Hao-Yu",
""
],
[
"Ma",
"Xiao-Peng",
""
]
] | As is well known, a varying effective gravitational "constant" is one of the common features of most modified gravity theories. Of course, as a modified gravity theory, $f(T)$ theory is not an exception. Noting that the observational constraint on the varying gravitational "constant" is very tight, in the present work ... |
gr-qc/9912002 | Daisuke Ida | Daisuke Ida | Brane-world cosmology | 4 pages, no figures | JHEP 0009 (2000) 014 | 10.1088/1126-6708/2000/09/014 | null | gr-qc | null | A simple model of the brane-world cosmology has been proposed, which is
characterized by four parameters, the bulk cosmological constant, the spatial
curvature of the universe, the radiation strength arising from bulk space-time
and the breaking parameter of $Z_2$-symmetry. The bulk space-time is assumed to
be locall... | [
{
"created": "Wed, 1 Dec 1999 01:11:11 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ida",
"Daisuke",
""
]
] | A simple model of the brane-world cosmology has been proposed, which is characterized by four parameters, the bulk cosmological constant, the spatial curvature of the universe, the radiation strength arising from bulk space-time and the breaking parameter of $Z_2$-symmetry. The bulk space-time is assumed to be locally ... |
gr-qc/0602044 | Archana Pai | Sabrina D'Antonio, Archana Pai, Pia Astone | Validating delta-filters for resonant bar detectors of improved
bandwidth foreseeing the future coincidence with interferometers | 7 pages, presented in Amaldi6, accepted for publication in Journal of
Physics: Conference Series | J.Phys.Conf.Ser. 32 (2006) 192-197 | 10.1088/1742-6596/32/1/029 | null | gr-qc | null | The classical delta filters used in the current resonant bar experiments for
detecting GW bursts are viable when the bandwidth of resonant bars is few Hz.
In that case, the incoming GW burst is likely to be viewed as an impulsive
signal in a very narrow frequency window. After making improvements in the
read-out with... | [
{
"created": "Mon, 13 Feb 2006 09:59:18 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"D'Antonio",
"Sabrina",
""
],
[
"Pai",
"Archana",
""
],
[
"Astone",
"Pia",
""
]
] | The classical delta filters used in the current resonant bar experiments for detecting GW bursts are viable when the bandwidth of resonant bars is few Hz. In that case, the incoming GW burst is likely to be viewed as an impulsive signal in a very narrow frequency window. After making improvements in the read-out with n... |
1412.4173 | Hajime Sotani | Hajime Sotani and Umpei Miyamoto | Properties of an electrically charged black hole in Eddington-inspired
Born-Infeld gravity | accepted for publication in PRD | Phys. Rev. D 90, 124087 (2014) | 10.1103/PhysRevD.90.124087 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We systematically examine the properties of an electrically charged black
hole in Eddington-inspired Born-Infeld gravity with not only the positive but
also the negative coupling constant in the theory. As a result, we numerically
find that the black hole solution exists even with the negative coupling
constant, wher... | [
{
"created": "Sat, 13 Dec 2014 00:48:59 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Sotani",
"Hajime",
""
],
[
"Miyamoto",
"Umpei",
""
]
] | We systematically examine the properties of an electrically charged black hole in Eddington-inspired Born-Infeld gravity with not only the positive but also the negative coupling constant in the theory. As a result, we numerically find that the black hole solution exists even with the negative coupling constant, where ... |
2308.03091 | Lijing Shao | Lihang Zhou, Richard Brito, Zhan-Feng Mai, Lijing Shao | Superradiant instabilities of massive bosons around exotic compact
objects | 12 pages, 5 figures; accepted by PRD | Phys. Rev. D 108 (2023) 103025 | 10.1103/PhysRevD.108.103025 | null | gr-qc astro-ph.HE hep-ph | http://creativecommons.org/licenses/by/4.0/ | Superradiantly unstable ultralight particles around a classical rotating
black hole (BH) can form an exponentially growing bosonic cloud, which have
been shown to provide an astrophysical probe to detect ultralight particles and
constrain their mass. However, the classical BH picture has been questioned,
and differen... | [
{
"created": "Sun, 6 Aug 2023 11:30:32 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Oct 2023 01:09:49 GMT",
"version": "v2"
}
] | 2023-11-15 | [
[
"Zhou",
"Lihang",
""
],
[
"Brito",
"Richard",
""
],
[
"Mai",
"Zhan-Feng",
""
],
[
"Shao",
"Lijing",
""
]
] | Superradiantly unstable ultralight particles around a classical rotating black hole (BH) can form an exponentially growing bosonic cloud, which have been shown to provide an astrophysical probe to detect ultralight particles and constrain their mass. However, the classical BH picture has been questioned, and different ... |
gr-qc/0405055 | James E. Lidsey | James E. Lidsey | Triality between Inflation, Cyclic and Phantom Cosmologies | 6 pages | Phys.Rev. D70 (2004) 041302 | 10.1103/PhysRevD.70.041302 | null | gr-qc astro-ph hep-th | null | It is shown that any spatially flat and isotropic universe undergoing
accelerated expansion driven by a self-interacting scalar field can be directly
related to a contracting, decelerating cosmology. The duality is made manifest
by expressing the scale factor and Hubble parameter as functions of the scalar
field and ... | [
{
"created": "Tue, 11 May 2004 13:40:05 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Lidsey",
"James E.",
""
]
] | It is shown that any spatially flat and isotropic universe undergoing accelerated expansion driven by a self-interacting scalar field can be directly related to a contracting, decelerating cosmology. The duality is made manifest by expressing the scale factor and Hubble parameter as functions of the scalar field and si... |
1508.01508 | Bahram Mashhoon | C. Chicone and B. Mashhoon | Nonlocal Gravity in the Solar System | 25 pages, 4 figures; v2: expanded version accepted for publication in
CQG | Class. Quantum Grav. 33, 075005 (2016) | 10.1088/0264-9381/33/7/075005 | null | gr-qc astro-ph.EP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The implications of the recent classical nonlocal generalization of
Einstein's theory of gravitation for gravitational physics in the Solar System
are investigated. In this theory, the nonlocal character of gravity appears to
simulate dark matter. Nonlocal gravity in the Newtonian regime involves a
reciprocal kernel ... | [
{
"created": "Thu, 6 Aug 2015 19:59:49 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jan 2016 23:57:22 GMT",
"version": "v2"
}
] | 2016-03-23 | [
[
"Chicone",
"C.",
""
],
[
"Mashhoon",
"B.",
""
]
] | The implications of the recent classical nonlocal generalization of Einstein's theory of gravitation for gravitational physics in the Solar System are investigated. In this theory, the nonlocal character of gravity appears to simulate dark matter. Nonlocal gravity in the Newtonian regime involves a reciprocal kernel wi... |
1812.09021 | Davide Fermi | Davide Fermi | Some remarks on a new exotic spacetime for time travel by free fall | 17 pages, 9 figures. Submitted as a contribution to the proceedings
of "DOMOSCHOOL - International Alpine School of Mathematics and Physics,
Domodossola 2018". Possible text overlaps with my previous work
arXiv:1803.08214, of which this is essentially a review. Additional results
concerning redshift/blueshift e... | null | 10.1007/978-3-030-18061-4_8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is essentially a review of a new spacetime model with closed causal
curves, recently presented in another paper (Class. Quantum Grav.
\textbf{35}(16) (2018), 165003). The spacetime at issue is topologically
trivial, free of curvature singularities, and even time and space orientable.
Besides summarizing pre... | [
{
"created": "Fri, 21 Dec 2018 09:50:47 GMT",
"version": "v1"
}
] | 2021-09-15 | [
[
"Fermi",
"Davide",
""
]
] | This work is essentially a review of a new spacetime model with closed causal curves, recently presented in another paper (Class. Quantum Grav. \textbf{35}(16) (2018), 165003). The spacetime at issue is topologically trivial, free of curvature singularities, and even time and space orientable. Besides summarizing previ... |
gr-qc/9809001 | Plamen Fiziev | P. Fiziev | Torsion Dilaton and Novel Minimal Coupling Principle | 10 pages, revtex, no figures. The discovered misprints are corrected,
new references, acknowledgments, and Appendix are added. Substantial changes
in formulas and results are made in sections 4 and 5 where a new cosmological
potential for torsion dilaton is introduced. In addition the relation of our
model of g... | null | null | SU-FzF: 25/98 | gr-qc astro-ph hep-ph hep-th math-ph math.MP | null | We propose a novel self consistent minimal coupling principle in presence of
torsion dilaton field. This principle yields a new local dilatation symmetry
and predicts the interactions of torsion dilaton with the real matter and with
metric. The soft violation of this symmetry yields a physical dilaton and a
simple re... | [
{
"created": "Tue, 1 Sep 1998 05:35:23 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Oct 1998 12:57:59 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Fiziev",
"P.",
""
]
] | We propose a novel self consistent minimal coupling principle in presence of torsion dilaton field. This principle yields a new local dilatation symmetry and predicts the interactions of torsion dilaton with the real matter and with metric. The soft violation of this symmetry yields a physical dilaton and a simple rela... |
1612.06377 | Alexander Oliveros | A. Oliveros | Slow-roll inflation from massive vector fields non-minimally coupled to
gravity | 7 pages, 1 figure, accepted for publication in Astrophysics and Space
Science | null | 10.1007/s10509-016-2998-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study slow-roll inflation for a vector-tensor model with
massive vector fields non-minimally coupled to gravity. The model under
consideration has arbitrary parameters for each geometrical coupling. Taking
into account a spatially flat FRW type universe and a general vector fields
(with temporal and s... | [
{
"created": "Mon, 19 Dec 2016 16:41:58 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Oliveros",
"A.",
""
]
] | In this work we study slow-roll inflation for a vector-tensor model with massive vector fields non-minimally coupled to gravity. The model under consideration has arbitrary parameters for each geometrical coupling. Taking into account a spatially flat FRW type universe and a general vector fields (with temporal and spa... |
2303.05260 | Zhipeng Peng | Chao-Qun Shen, Xiao-Min Zhang, Zhi-Peng Peng, He Liu, Xi-Bin Li and
Peng-Cheng Chu | Non-Gaussianity in the warm k-inflation | null | null | 10.1103/PhysRevD.107.123521 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper presents and investigates non-Gaussian perturbations for the warm
k-inflation model that is driven by pure kinetic energy. The two complementary
components of the overall non-Gaussianity are the three-point and four-point
correlations. The intrinsic non-Gaussian component, denoted as the nonlinear
paramete... | [
{
"created": "Thu, 9 Mar 2023 13:53:39 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Mar 2023 08:24:31 GMT",
"version": "v2"
},
{
"created": "Sun, 26 Mar 2023 08:39:31 GMT",
"version": "v3"
}
] | 2023-06-28 | [
[
"Shen",
"Chao-Qun",
""
],
[
"Zhang",
"Xiao-Min",
""
],
[
"Peng",
"Zhi-Peng",
""
],
[
"Liu",
"He",
""
],
[
"Li",
"Xi-Bin",
""
],
[
"Chu",
"Peng-Cheng",
""
]
] | This paper presents and investigates non-Gaussian perturbations for the warm k-inflation model that is driven by pure kinetic energy. The two complementary components of the overall non-Gaussianity are the three-point and four-point correlations. The intrinsic non-Gaussian component, denoted as the nonlinear parameter ... |
1601.04653 | Diego Blas | Diego Blas | Modified gravity and binary pulsars: the Lorentz violating case | 6 pages, 1 figure. Prepared for the proceedings of Marcel Grossman 14 | null | null | CERN-TH-2016-014 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of binary pulsars can be used to test different aspects of
gravitation. This is particularly important to constrain alternatives to
general relativity in regimes which are not probed by other methods. In this
short contribution, I will describe the case of theories of gravity without
Lorentz invariance. ... | [
{
"created": "Mon, 18 Jan 2016 18:52:16 GMT",
"version": "v1"
}
] | 2016-01-19 | [
[
"Blas",
"Diego",
""
]
] | The dynamics of binary pulsars can be used to test different aspects of gravitation. This is particularly important to constrain alternatives to general relativity in regimes which are not probed by other methods. In this short contribution, I will describe the case of theories of gravity without Lorentz invariance. Th... |
2207.08375 | Matt Visser | Rudeep Gaur (Victoria University of Wellington) and Matt Visser
(Victoria University of Wellington) | Cosmology in Painleve-Gullstrand coordinates | 37 pages; V2: minor changes in presentation; no physics changes; this
version accepted for publication in JCAP | null | 10.1088/1475-7516/2022/09/030 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmology is most typically analyzed using standard co-moving coordinates, in
which the galaxies are (on average, up to presumably small peculiar velocities)
"at rest", while "space" is expanding. But this is merely a specific coordinate
choice; and it is important to realise that for certain purposes other,
(sometim... | [
{
"created": "Mon, 18 Jul 2022 04:21:24 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Aug 2022 04:25:30 GMT",
"version": "v2"
}
] | 2022-09-21 | [
[
"Gaur",
"Rudeep",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Cosmology is most typically analyzed using standard co-moving coordinates, in which the galaxies are (on average, up to presumably small peculiar velocities) "at rest", while "space" is expanding. But this is merely a specific coordinate choice; and it is important to realise that for certain purposes other, (sometimes... |
1101.4687 | Vladimir S. Manko | V. S. Manko and E. Ruiz | On a Simple Representation of the Kinnersley-Chitre Metric | 11 pages, 4 figures, extended section 4, reference added, accepted
for Prog. Theor. Phys | Prog.Theor.Phys.125:1241-1254,2011 | 10.1143/PTP.125.1241 | null | gr-qc astro-ph.SR hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A concise form of the Kinnersley-Chitre five-parameter metric for a spinning
mass is obtained by exploiting a remarkable similarity between the metric's
factor structure and the analogous structure of the Tomimatsu-Sato solutions
with even distortion parameter delta. The corresponding general subfamily of
asymptotica... | [
{
"created": "Mon, 24 Jan 2011 23:09:44 GMT",
"version": "v1"
},
{
"created": "Tue, 10 May 2011 05:04:05 GMT",
"version": "v2"
}
] | 2011-09-12 | [
[
"Manko",
"V. S.",
""
],
[
"Ruiz",
"E.",
""
]
] | A concise form of the Kinnersley-Chitre five-parameter metric for a spinning mass is obtained by exploiting a remarkable similarity between the metric's factor structure and the analogous structure of the Tomimatsu-Sato solutions with even distortion parameter delta. The corresponding general subfamily of asymptoticall... |
0806.0137 | Christodoulakis Theodosios | T. Christodoulakis, G. Doulis, Petros A Terzis, E. Melas, Th.
Grammenos, G. O. Papadopoulos, A. Spanou | Towards Canonical Quantum Gravity for G1 Geometries in 2+1 Dimensions
with a Lambda--Term | Latex 2e source file, 25 pages, no figures, final version (accepted
in CQG) | Class.Quant.Grav.25:235014,2008 | 10.1088/0264-9381/25/23/235014 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The canonical analysis and subsequent quantization of the (2+1)-dimensional
action of pure gravity plus a cosmological constant term is considered, under
the assumption of the existence of one spacelike Killing vector field. The
proper imposition of the quantum analogues of the two linear (momentum)
constraints reduc... | [
{
"created": "Sun, 1 Jun 2008 09:45:24 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Jan 2009 13:29:06 GMT",
"version": "v2"
}
] | 2009-01-07 | [
[
"Christodoulakis",
"T.",
""
],
[
"Doulis",
"G.",
""
],
[
"Terzis",
"Petros A",
""
],
[
"Melas",
"E.",
""
],
[
"Grammenos",
"Th.",
""
],
[
"Papadopoulos",
"G. O.",
""
],
[
"Spanou",
"A.",
""
]
] | The canonical analysis and subsequent quantization of the (2+1)-dimensional action of pure gravity plus a cosmological constant term is considered, under the assumption of the existence of one spacelike Killing vector field. The proper imposition of the quantum analogues of the two linear (momentum) constraints reduces... |
gr-qc/0605058 | Valeri Frolov | Valeri P. Frolov and David Kubiznak | `Hidden' Symmetries of Higher Dimensional Rotating Black Holes | 4 pages, slightly extended introduction | Phys.Rev.Lett.98:011101,2007 | 10.1103/PhysRevLett.98.011101 | Alberta-Thy-05-06 | gr-qc hep-th | null | We demonstrate that the rotating black holes in an arbitrary number of
dimensions and without any restrictions on their rotation parameters possess
the same `hidden' symmetry as the 4-dimensional Kerr metric. Namely, besides
the spacetime symmetries generated by the Killing vectors they also admit the
(antisymmetric)... | [
{
"created": "Wed, 10 May 2006 20:24:49 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jan 2007 20:16:55 GMT",
"version": "v2"
}
] | 2008-12-18 | [
[
"Frolov",
"Valeri P.",
""
],
[
"Kubiznak",
"David",
""
]
] | We demonstrate that the rotating black holes in an arbitrary number of dimensions and without any restrictions on their rotation parameters possess the same `hidden' symmetry as the 4-dimensional Kerr metric. Namely, besides the spacetime symmetries generated by the Killing vectors they also admit the (antisymmetric) K... |
gr-qc/0505102 | Duncan Brown | Duncan A Brown (for the LIGO Scientific Collaboration) | Using the INSPIRAL program to search for gravitational waves from
low-mass binary inspiral | 11 pages, 3 figures, submitted to Classical and Quantum Gravity for
the special issue of the GWDAW9 Proceedings | Class.Quant.Grav. 22 (2005) S1097-S1108 | 10.1088/0264-9381/22/18/S24 | null | gr-qc | null | The INSPIRAL program is the LIGO Scientific Collaboration's computational
engine for the search for gravitational waves from binary neutron stars and
sub-solar mass black holes. We describe how this program, which makes use of
the FINDCHIRP algorithm (discussed in a companion paper), is integrated into a
sophisticate... | [
{
"created": "Thu, 19 May 2005 23:45:55 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Brown",
"Duncan A",
"",
"for the LIGO Scientific Collaboration"
]
] | The INSPIRAL program is the LIGO Scientific Collaboration's computational engine for the search for gravitational waves from binary neutron stars and sub-solar mass black holes. We describe how this program, which makes use of the FINDCHIRP algorithm (discussed in a companion paper), is integrated into a sophisticated ... |
2104.00339 | Andronikos Paliathanasis | Andronikos Paliathanasis | Minisuperspace Quantization of $f\left(T,B\right) $ Cosmology | 11 pages, no figures | Universe 2021, 7(5), 150 | 10.3390/universe7050150 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We discuss the quantization in the minisuperspace for the generalized
fourth-order teleparallel cosmological theory known as $f\left( T,B\right) $.
Specifically we focus on the case where the theory is linear on the torsion
scalar, in that consideration we are able to write the cosmological field
equations with the u... | [
{
"created": "Thu, 1 Apr 2021 08:42:10 GMT",
"version": "v1"
}
] | 2021-06-08 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | We discuss the quantization in the minisuperspace for the generalized fourth-order teleparallel cosmological theory known as $f\left( T,B\right) $. Specifically we focus on the case where the theory is linear on the torsion scalar, in that consideration we are able to write the cosmological field equations with the use... |
1108.2333 | Partha Pratim Pradhan | Parthapratim Pradhan and Parthasarathi Majumdar | Extremal Limits and Kerr Spacetime | 17 Pages, Latex 2e, no figures, Published version in EPJC | Eur. Phys. J. C (2013) 73:2470 | 10.1140/epjc/s10052-013-2470-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fact that one must evaluate the near-extremal and near-horizon limits of
Kerr space-time in a specific order, is shown to a lead to discontinuity in the
extremal limit, such that this limiting space-time differs nontrivially from
the precisely extremal space-time. This is established by first showing a
discontinu... | [
{
"created": "Thu, 11 Aug 2011 06:43:36 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Nov 2011 17:28:07 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Nov 2011 16:29:47 GMT",
"version": "v3"
},
{
"created": "Wed, 30 Nov 2011 16:47:11 GMT",
"version": "v4"
},
{
"c... | 2015-08-21 | [
[
"Pradhan",
"Parthapratim",
""
],
[
"Majumdar",
"Parthasarathi",
""
]
] | The fact that one must evaluate the near-extremal and near-horizon limits of Kerr space-time in a specific order, is shown to a lead to discontinuity in the extremal limit, such that this limiting space-time differs nontrivially from the precisely extremal space-time. This is established by first showing a discontinuit... |
1702.08610 | Shintaro Nakamura | Shintaro Nakamura, Ryotaro Kase, and Shinji Tsujikawa | Cosmology in beyond-generalized Proca theories | 21 pages, 9 figures | Phys. Rev. D 95, 104001 (2017) | 10.1103/PhysRevD.95.104001 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The beyond-generalized Proca theories are the extension of second-order
massive vector-tensor theories (dubbed generalized Proca theories) with two
transverse vector modes and one longitudinal scalar besides two tensor
polarizations. Even with this extension, the propagating degrees of freedom
remain unchanged on the... | [
{
"created": "Tue, 28 Feb 2017 02:29:51 GMT",
"version": "v1"
},
{
"created": "Tue, 9 May 2017 02:45:15 GMT",
"version": "v2"
}
] | 2017-05-11 | [
[
"Nakamura",
"Shintaro",
""
],
[
"Kase",
"Ryotaro",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | The beyond-generalized Proca theories are the extension of second-order massive vector-tensor theories (dubbed generalized Proca theories) with two transverse vector modes and one longitudinal scalar besides two tensor polarizations. Even with this extension, the propagating degrees of freedom remain unchanged on the i... |
2311.01209 | Zohreh Nekouee | Z. Nekouee, S. K. Narasimhamurthy, S. K. J. Pacif | Black Hole Solutions with Constant Ricci Scalar in a Model of Finsler
Gravity | 30 Pages, 7 figures | JCAP04(2024)061 | 10.1088/1475-7516/2024/04/061 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Ricci scalar being zero is equivalent to the vacuum field equation in Finsler
space-time. The Schwarzschild metric can be concluded from the field equation's
solution if the space-time conserves spherical symmetry. This research aims to
investigate Finslerian Schwarzschild-de Sitter space-time. Recent studies based
o... | [
{
"created": "Thu, 2 Nov 2023 13:03:19 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Apr 2024 21:12:39 GMT",
"version": "v2"
}
] | 2024-04-25 | [
[
"Nekouee",
"Z.",
""
],
[
"Narasimhamurthy",
"S. K.",
""
],
[
"Pacif",
"S. K. J.",
""
]
] | Ricci scalar being zero is equivalent to the vacuum field equation in Finsler space-time. The Schwarzschild metric can be concluded from the field equation's solution if the space-time conserves spherical symmetry. This research aims to investigate Finslerian Schwarzschild-de Sitter space-time. Recent studies based on ... |
2109.09606 | Susobhan Mandal | Golam Mortuza Hossain and Susobhan Mandal | Higher mass limits of neutron stars from the equation of states in
curved spacetime | v1 10 pages, 10 figures; v2 11 pages, matches with published version | Phys. Rev. D 104, 123005, 2021 | 10.1103/PhysRevD.104.123005 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to solve the Tolman-Oppenheimer-Volkoff equations for neutron stars,
one routinely uses the equation of states which are computed in the Minkowski
spacetime. Using a first-principle approach, it is shown that the equation of
states which are computed within the curved spacetime of the neutron stars
include t... | [
{
"created": "Mon, 20 Sep 2021 15:01:06 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Dec 2021 13:06:00 GMT",
"version": "v2"
}
] | 2021-12-15 | [
[
"Hossain",
"Golam Mortuza",
""
],
[
"Mandal",
"Susobhan",
""
]
] | In order to solve the Tolman-Oppenheimer-Volkoff equations for neutron stars, one routinely uses the equation of states which are computed in the Minkowski spacetime. Using a first-principle approach, it is shown that the equation of states which are computed within the curved spacetime of the neutron stars include the... |
2008.02764 | Kei Yamada | Tomohiro Fujita, Ippei Obata, Takahiro Tanaka, Kei Yamada | Resonant gravitational waves in dynamical Chern-Simons-axion gravity | 26 pages, 7 figures | Class.Quant.Grav. 38 (2021) 4, 045010 | 10.1088/1361-6382/abce49 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider dynamical Chern-Simons gravity with the
identification of the scalar field coupled though the Pontryagin density with
the axion dark matter, and we discuss the effects of the parametric resonance
on gravitational waves (GWs). When we consider GWs in a coherently oscillating
axion cloud, we ... | [
{
"created": "Thu, 6 Aug 2020 17:05:43 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jan 2021 05:44:15 GMT",
"version": "v2"
}
] | 2021-01-05 | [
[
"Fujita",
"Tomohiro",
""
],
[
"Obata",
"Ippei",
""
],
[
"Tanaka",
"Takahiro",
""
],
[
"Yamada",
"Kei",
""
]
] | In this paper, we consider dynamical Chern-Simons gravity with the identification of the scalar field coupled though the Pontryagin density with the axion dark matter, and we discuss the effects of the parametric resonance on gravitational waves (GWs). When we consider GWs in a coherently oscillating axion cloud, we co... |
0709.0767 | Bruno Goncalves | Bruno Goncalves, Yuri N. Obukhov, Ilya L. Shapiro | Exact Foldy-Wouthuysen transformation for gravitational waves and
magnetic field background | null | Phys.Rev.D75:124023,2007 | 10.1103/PhysRevD.75.124023 | null | gr-qc | null | We consider an exact Foldy-Wouthuysen transformation for the Dirac spinor
field on the combined background of a gravitational wave and constant uniform
magnetic field. By taking the classical limit of the spinor field Hamiltonian
we arrive at the equations of motion for the non-relativistic spinning
particle. Two dif... | [
{
"created": "Thu, 6 Sep 2007 02:17:08 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Goncalves",
"Bruno",
""
],
[
"Obukhov",
"Yuri N.",
""
],
[
"Shapiro",
"Ilya L.",
""
]
] | We consider an exact Foldy-Wouthuysen transformation for the Dirac spinor field on the combined background of a gravitational wave and constant uniform magnetic field. By taking the classical limit of the spinor field Hamiltonian we arrive at the equations of motion for the non-relativistic spinning particle. Two diffe... |
2110.01264 | Chiranjeeb Singha | Chiranjeeb Singha, Subhashish Banerjee | Thermal radiation in curved spacetime using influence functional
formalism | Modified version, to appear in Phys. Rev. D | null | 10.1103/PhysRevD.105.045020 | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | Generalizing to relativistic exponential scaling and using the theory of
noise from quantum fluctuations, it has been shown that one vacuum (Rindler,
Hartle-Hawking, or Gibbons-Hawking for the cases of the uniformly accelerated
detector, black hole, and de-Sitter universe, respectively) can be understood
as resulting... | [
{
"created": "Mon, 4 Oct 2021 09:07:49 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Feb 2022 09:59:45 GMT",
"version": "v2"
}
] | 2022-03-14 | [
[
"Singha",
"Chiranjeeb",
""
],
[
"Banerjee",
"Subhashish",
""
]
] | Generalizing to relativistic exponential scaling and using the theory of noise from quantum fluctuations, it has been shown that one vacuum (Rindler, Hartle-Hawking, or Gibbons-Hawking for the cases of the uniformly accelerated detector, black hole, and de-Sitter universe, respectively) can be understood as resulting f... |
gr-qc/0209001 | Sanjay M. Wagh | Sanjay M. Wagh, Ravindra V. Saraykar and Keshlan S. Govinder | What is the spacetime of {\em physically realizable} spherical collapse? | Latex4, No Figures, Comments and Criticisms most welcome | null | null | null | gr-qc astro-ph | null | We argue that a particular spacetime, a spherically symmetric spacetime with
hyper-surface orthogonal, radial, homothetic Killing vector, is a physically
meaningful spacetime that describes the problem of spherical gravitational
collapse in its full "physical" generality.
| [
{
"created": "Sat, 31 Aug 2002 13:43:59 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wagh",
"Sanjay M.",
""
],
[
"Saraykar",
"Ravindra V.",
""
],
[
"Govinder",
"Keshlan S.",
""
]
] | We argue that a particular spacetime, a spherically symmetric spacetime with hyper-surface orthogonal, radial, homothetic Killing vector, is a physically meaningful spacetime that describes the problem of spherical gravitational collapse in its full "physical" generality. |
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