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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2301.02914 | Mikhail Zubkov Dr | M. Selch, J. Miller, M.A.Zubkov | Gravastar-like black hole solutions in $q$-theory | Latex, 14 figures, 28 pages | null | 10.1088/1361-6382/ace14b | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a stationary spherically symmetric solution of the Einstein
equations, with a source generated by a scalar field of $q$-theory. In this
theory Riemannian gravity, as described by the Einstein - Hilbert action, is
coupled to a three - form field that describes the dynamical vacuum. Formally
it behaves like ... | [
{
"created": "Sat, 7 Jan 2023 18:32:20 GMT",
"version": "v1"
},
{
"created": "Tue, 30 May 2023 17:38:15 GMT",
"version": "v2"
}
] | 2023-07-26 | [
[
"Selch",
"M.",
""
],
[
"Miller",
"J.",
""
],
[
"Zubkov",
"M. A.",
""
]
] | We present a stationary spherically symmetric solution of the Einstein equations, with a source generated by a scalar field of $q$-theory. In this theory Riemannian gravity, as described by the Einstein - Hilbert action, is coupled to a three - form field that describes the dynamical vacuum. Formally it behaves like a ... |
1603.01465 | Hooman Moradpour Hooman | H. Moradpour, Rafael C. Nunes, Everton M. C. Abreu, Jorge Ananias Neto | A note on the relations between thermodynamics, energy definitions and
Friedmann equations | The text has been increased | Mod. Phys. Lett. A (2017), Vol. 32, No. 13, 1750078 | 10.1142/S021773231750078X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In what follows, we investigate the relation between the Friedmann and
thermodynamic pressure equations, through solving the Friedmann and
thermodynamic pressure equations simultaneously. Our investigation shows that a
perfect fluid, as a suitable solution for the Friedmann equations leading to
the standard modelling... | [
{
"created": "Mon, 29 Feb 2016 09:37:28 GMT",
"version": "v1"
},
{
"created": "Tue, 17 May 2016 05:58:30 GMT",
"version": "v2"
},
{
"created": "Sat, 6 Aug 2016 12:08:40 GMT",
"version": "v3"
}
] | 2017-04-21 | [
[
"Moradpour",
"H.",
""
],
[
"Nunes",
"Rafael C.",
""
],
[
"Abreu",
"Everton M. C.",
""
],
[
"Neto",
"Jorge Ananias",
""
]
] | In what follows, we investigate the relation between the Friedmann and thermodynamic pressure equations, through solving the Friedmann and thermodynamic pressure equations simultaneously. Our investigation shows that a perfect fluid, as a suitable solution for the Friedmann equations leading to the standard modelling o... |
0903.3088 | Xin-Zhou Li | Xin-zhou Li, Chang-bo Sun and Ping Xi | Torsion cosmological dynamics | 4 pages, 3 figures | Phys.Rev.D79:027301,2009 | 10.1103/PhysRevD.79.027301 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the dynamical attractor and heteroclinic orbit have been
employed to make the late-time behaviors of the model insensitive to the
initial condition and thus alleviate the fine-tuning problem in the torsion
cosmology. The late-time de Sitter attractor indicates that torsion cosmology
is an elegant schem... | [
{
"created": "Wed, 18 Mar 2009 04:47:48 GMT",
"version": "v1"
}
] | 2010-04-22 | [
[
"Li",
"Xin-zhou",
""
],
[
"Sun",
"Chang-bo",
""
],
[
"Xi",
"Ping",
""
]
] | In this paper, the dynamical attractor and heteroclinic orbit have been employed to make the late-time behaviors of the model insensitive to the initial condition and thus alleviate the fine-tuning problem in the torsion cosmology. The late-time de Sitter attractor indicates that torsion cosmology is an elegant scheme ... |
1402.5678 | Hoda Farahani | M. Khurshudyan, J. Sadeghi, A. Pasqua, S. Chattopadhyay, R.
Myrzakulov, and H. Farahani | Interacting Ricci dark energy models with an effective $\Lambda$-term in
Lyra manifold | 14 pages | IJTP 54 (2015) 749 | 10.1007/s10773-014-2266-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider a universe filled with barotropic dark matter and
Ricci dark energy in Lyra geometry with varying Lambda. We assume two different
kinds of interactions between dark matter and dark energy. Then, by using
numerical analysis, we investigate some cosmological parameters of the models
such as eq... | [
{
"created": "Sun, 23 Feb 2014 21:28:30 GMT",
"version": "v1"
}
] | 2015-05-12 | [
[
"Khurshudyan",
"M.",
""
],
[
"Sadeghi",
"J.",
""
],
[
"Pasqua",
"A.",
""
],
[
"Chattopadhyay",
"S.",
""
],
[
"Myrzakulov",
"R.",
""
],
[
"Farahani",
"H.",
""
]
] | In this paper we consider a universe filled with barotropic dark matter and Ricci dark energy in Lyra geometry with varying Lambda. We assume two different kinds of interactions between dark matter and dark energy. Then, by using numerical analysis, we investigate some cosmological parameters of the models such as equa... |
1010.1143 | Mir Faizal | Mir Faizal | BRST and Anti-BRST Symmetries in Perturbative Quantum Gravity | Aversion accepted for publication in Foundations of Physics | Found.Phys.41:270-277,2011 | 10.1007/s10701-010-9511-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In perturbative quantum gravity, the sum of the classical Lagrangian density,
a gauge fixing term and a ghost term is invariant under two sets of
supersymmetric transformations called the BRST and the anti-BRST
transformations. In this paper we will analyse the BRST and the anti-BRST
symmetries of perturbative quantu... | [
{
"created": "Wed, 6 Oct 2010 12:59:20 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Oct 2010 17:57:53 GMT",
"version": "v2"
}
] | 2011-01-25 | [
[
"Faizal",
"Mir",
""
]
] | In perturbative quantum gravity, the sum of the classical Lagrangian density, a gauge fixing term and a ghost term is invariant under two sets of supersymmetric transformations called the BRST and the anti-BRST transformations. In this paper we will analyse the BRST and the anti-BRST symmetries of perturbative quantum ... |
2303.17364 | Charlie Hoy | Connor McIsaac, Charlie Hoy and Ian Harry | A search technique to observe precessing compact binary mergers in the
advanced detector era | 23 pages, 12 figures. For data release, see
https://icg-gravwaves.github.io/precessing_search_paper/ | null | null | LIGO-P2300071 | gr-qc astro-ph.HE astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | Gravitational-wave signals from compact binary coalescences are most
efficiently identified through matched filter searches, which match the data
against a pre-generated bank of gravitational-wave templates. Although
different techniques for performing the matched filter, as well as generating
the template bank, exis... | [
{
"created": "Thu, 30 Mar 2023 13:27:43 GMT",
"version": "v1"
}
] | 2023-03-31 | [
[
"McIsaac",
"Connor",
""
],
[
"Hoy",
"Charlie",
""
],
[
"Harry",
"Ian",
""
]
] | Gravitational-wave signals from compact binary coalescences are most efficiently identified through matched filter searches, which match the data against a pre-generated bank of gravitational-wave templates. Although different techniques for performing the matched filter, as well as generating the template bank, exist,... |
1801.02026 | Izzet Sakalli | G. Tokgoz and I. Sakalli | Spectroscopy of $z=0$ Lifshitz Black Hole | 9 pages, 1 figure | Advances in High Energy Physics Volume 2018, Article ID 3270790, 7
pages | 10.1155/2018/3270790 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We studied the thermodynamics and spectroscopy of a $4$-dimensional, $z=0$
Lifshitz black hole ($Z0$LBH). Using the Wald's entropy formula and the Hawking
temperature, we derived the quasilocal mass of the $Z0$LBH. Based on the exact
solution to the near-horizon Zerilli equation of the massive scalar waves, we
comput... | [
{
"created": "Sat, 6 Jan 2018 14:59:11 GMT",
"version": "v1"
}
] | 2018-12-05 | [
[
"Tokgoz",
"G.",
""
],
[
"Sakalli",
"I.",
""
]
] | We studied the thermodynamics and spectroscopy of a $4$-dimensional, $z=0$ Lifshitz black hole ($Z0$LBH). Using the Wald's entropy formula and the Hawking temperature, we derived the quasilocal mass of the $Z0$LBH. Based on the exact solution to the near-horizon Zerilli equation of the massive scalar waves, we computed... |
1003.5366 | Boris Hikin L | Boris Hikin | Einstein-Aether Theory With and Without Einstein | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The exact static spherically symmetric solutions for pure-aether theory and
Einstein-aether theory are presented. It is shown that both theories can
deliver the Schwarzschild metric, but only the Einstein-aether theory contains
solutions with "almost-Schwarzschild" metrics that satisfy Einstein's
experiments. Two spe... | [
{
"created": "Sun, 28 Mar 2010 12:43:30 GMT",
"version": "v1"
}
] | 2010-03-30 | [
[
"Hikin",
"Boris",
""
]
] | The exact static spherically symmetric solutions for pure-aether theory and Einstein-aether theory are presented. It is shown that both theories can deliver the Schwarzschild metric, but only the Einstein-aether theory contains solutions with "almost-Schwarzschild" metrics that satisfy Einstein's experiments. Two speci... |
1005.0790 | Alessandro Gruppuso | Roberto Casadio and Alessandro Gruppuso | CMB acoustic scale in the entropic-like accelerating universe | 6 pages, 2 figures. Accepted for publication in Physical Review D | Phys.Rev.D84:023503,2011 | 10.1103/PhysRevD.84.023503 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider generalizations of the entropic accelerating universe recently
proposed in Ref. [4,5] and show that their background equations can be made
equivalent to a model with a dark energy component with constant parameter of
state $w_{X} = -1 + 2\, \gamma /3$, where $\gamma$ is related to the
coefficients of the ... | [
{
"created": "Wed, 5 May 2010 16:47:13 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Jun 2011 10:06:11 GMT",
"version": "v2"
}
] | 2011-08-08 | [
[
"Casadio",
"Roberto",
""
],
[
"Gruppuso",
"Alessandro",
""
]
] | We consider generalizations of the entropic accelerating universe recently proposed in Ref. [4,5] and show that their background equations can be made equivalent to a model with a dark energy component with constant parameter of state $w_{X} = -1 + 2\, \gamma /3$, where $\gamma$ is related to the coefficients of the ne... |
gr-qc/0602052 | Marc Lachieze-Rey | Marc Lachieze-Rey (APC) | The covariance of GPS coordinates and frames | new version, as to appear in CQG; some equations corrected, redaction
improved ; references added | Classical and Quantum Gravity, 23 (2006) 3531-3544 | 10.1088/0264-9381/23/10/019 | null | gr-qc astro-ph | null | We explore, in the general relativistic context, the properties of the
recently introduced GPS coordinates, as well as those of the associated frames
and coframes. We show that they are covariant, and completely independent of
any observer. We show that standard spectroscopic and astrometric observations
allow any ob... | [
{
"created": "Tue, 14 Feb 2006 10:11:22 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Mar 2006 11:46:20 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Lachieze-Rey",
"Marc",
"",
"APC"
]
] | We explore, in the general relativistic context, the properties of the recently introduced GPS coordinates, as well as those of the associated frames and coframes. We show that they are covariant, and completely independent of any observer. We show that standard spectroscopic and astrometric observations allow any obse... |
1411.0104 | Pedro Pina Avelino | P. P. Avelino | Could the dynamics of the Universe be influenced by what is going on
inside black holes? | 8 pages, 2 figures. Version 2 (accepted for publication in JCAP):
minor typos corrected | JCAP 1504 (2015) 024 | 10.1088/1475-7516/2015/04/024 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the potential impact of mass inflation inside black holes on
the dynamics of the Universe, considering a recent reformulation of general
relativity, proposed in [1], which prevents the vacuum energy from acting as a
gravitational source. The interior dynamics of accreting black holes is
studied, at the... | [
{
"created": "Sat, 1 Nov 2014 11:29:46 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Mar 2015 12:02:25 GMT",
"version": "v2"
}
] | 2015-05-06 | [
[
"Avelino",
"P. P.",
""
]
] | We investigate the potential impact of mass inflation inside black holes on the dynamics of the Universe, considering a recent reformulation of general relativity, proposed in [1], which prevents the vacuum energy from acting as a gravitational source. The interior dynamics of accreting black holes is studied, at the c... |
1707.05862 | Jonathan Sorce | Jonathan Sorce and Robert M. Wald | Gedanken Experiments to Destroy a Black Hole II: Kerr-Newman Black Holes
Cannot be Over-Charged or Over-Spun | 38 pages, 6 figures; minor revisions/corrections; version accepted
for publication in PRD | Phys. Rev. D 96, 104014 (2017) | 10.1103/PhysRevD.96.104014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider gedanken experiments to destroy an extremal or nearly extremal
Kerr-Newman black hole by causing it to absorb matter with sufficient charge
and/or angular momentum as compared with energy that it cannot remain a black
hole. It was previously shown by one of us that such gedanken experiments
cannot succeed... | [
{
"created": "Tue, 18 Jul 2017 21:23:44 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Oct 2017 01:27:59 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Nov 2017 18:43:09 GMT",
"version": "v3"
}
] | 2017-11-15 | [
[
"Sorce",
"Jonathan",
""
],
[
"Wald",
"Robert M.",
""
]
] | We consider gedanken experiments to destroy an extremal or nearly extremal Kerr-Newman black hole by causing it to absorb matter with sufficient charge and/or angular momentum as compared with energy that it cannot remain a black hole. It was previously shown by one of us that such gedanken experiments cannot succeed f... |
0908.1322 | Nadiezhda Montelongo | N. Montelongo Garcia, T. Zannias | On the Structure of the Effective Potential for a Spherical Wormhole | 15 pages, 0 figures | Phys. Rev. D 78, 064003 (2008) | 10.1103/PhysRevD.78.064003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The structure of the effective potential $V$ describing causal geodesics near
the throat of an arbitrary spherical wormhole is analyzed. Einstein's equations
relative to a set of regular coordinates covering a vicinity of the throat
imply that any spherical wormhole can be constructed from solutions of an
effective i... | [
{
"created": "Mon, 10 Aug 2009 13:33:43 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Garcia",
"N. Montelongo",
""
],
[
"Zannias",
"T.",
""
]
] | The structure of the effective potential $V$ describing causal geodesics near the throat of an arbitrary spherical wormhole is analyzed. Einstein's equations relative to a set of regular coordinates covering a vicinity of the throat imply that any spherical wormhole can be constructed from solutions of an effective ini... |
gr-qc/0207123 | Orfeu Bertolami | O. Bertolami and M. Tajmar | Hypothetical Gravity Control and Implications for Spacecraft Propulsion | 5 pages, plain Latex | null | null | DF/IST-8.02 | gr-qc | null | A scientific analysis of the conditions under which gravity could be
controlled and the implications that an hypothetical manipulation of gravity
would have for known schemes of space propulsion have been the scope of a
recent study carried out for the European Space Agency. The underlying
fundamental physical princi... | [
{
"created": "Wed, 31 Jul 2002 12:40:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bertolami",
"O.",
""
],
[
"Tajmar",
"M.",
""
]
] | A scientific analysis of the conditions under which gravity could be controlled and the implications that an hypothetical manipulation of gravity would have for known schemes of space propulsion have been the scope of a recent study carried out for the European Space Agency. The underlying fundamental physical principl... |
gr-qc/0212129 | S. K. Sahay | S.K. Sahay | Matching of the continuous gravitational wave in an all sky search | 16 pages, 7 figures, 3 Tables, To appear in Int. J. Mod. Phys. D | Int.J.Mod.Phys.D12:1227-1240,2003 | 10.1142/S0218271803003578 | null | gr-qc astro-ph | null | We investigate the matching of continuous gravitational wave (CGW) signals in
an all sky search with reference to Earth based laser interferometric
detectors. We consider the source location as the parameters of the signal
manifold and templates corresponding to different source locations. It has been
found that the ... | [
{
"created": "Tue, 31 Dec 2002 14:53:28 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Mar 2003 15:55:03 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Sahay",
"S. K.",
""
]
] | We investigate the matching of continuous gravitational wave (CGW) signals in an all sky search with reference to Earth based laser interferometric detectors. We consider the source location as the parameters of the signal manifold and templates corresponding to different source locations. It has been found that the ma... |
gr-qc/0612139 | Christophe Real | Christophe Real | Conservation of energy and Gauss Bonnet gravity | 10 pages | null | null | null | gr-qc | null | It is shown how can be made the classification of all tensors constructed
from the Riemann tensor that verify the conservation of gravitational energy
momentum. More precisely we explain that there exists a unique tensor of degree
n in the Riemann tensor and its contractions that verifies the conservation of
energy. ... | [
{
"created": "Thu, 21 Dec 2006 18:47:25 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Nov 2007 16:59:58 GMT",
"version": "v2"
}
] | 2007-11-07 | [
[
"Real",
"Christophe",
""
]
] | It is shown how can be made the classification of all tensors constructed from the Riemann tensor that verify the conservation of gravitational energy momentum. More precisely we explain that there exists a unique tensor of degree n in the Riemann tensor and its contractions that verifies the conservation of energy. We... |
0811.2832 | Ali Shojai | Fatimah Shojai, and Ali Shojai | Geodesic Congruences in the Palatini f(R) Theory | null | Phys.Rev.D78:104011,2008 | 10.1103/PhysRevD.78.104011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We shall investigate the properties of a congruence of geodesics in the
framework of Palatini f(R) theories. We shall evaluate the modified geodesic
deviation equation and the Raychaudhuri's equation and show that f(R) Palatini
theories do not necessarily lead to attractive forces. Also we shall study
energy conditio... | [
{
"created": "Tue, 18 Nov 2008 03:47:22 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Shojai",
"Fatimah",
""
],
[
"Shojai",
"Ali",
""
]
] | We shall investigate the properties of a congruence of geodesics in the framework of Palatini f(R) theories. We shall evaluate the modified geodesic deviation equation and the Raychaudhuri's equation and show that f(R) Palatini theories do not necessarily lead to attractive forces. Also we shall study energy condition ... |
1003.2481 | Stephen Privitera | The LIGO Scientific Collaboration, the Virgo Collaboration: J. Abadie,
B. P. Abbott, R. Abbott, M Abernathy, T. Accadia, F. Acernese, C. Adams, R.
Adhikari, P. Ajith, B. Allen, G. Allen, E. Amador Ceron, R. S. Amin, S. B.
Anderson, W. G. Anderson, F. Antonucci, S. Aoudia, M. A. Arain, M. Araya, M.
Aronsson, K. ... | Sensitivity to Gravitational Waves from Compact Binary Coalescences
Achieved during LIGO's Fifth and Virgo's First Science Run | 12 pages, 5 figures | null | null | LIGO-T0900499-v19, VIR-0171A-10 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize the sensitivity achieved by the LIGO and Virgo gravitational
wave detectors for compact binary coalescence (CBC) searches during LIGO's
fifth science run and Virgo's first science run. We present noise spectral
density curves for each of the four detectors that operated during these
science runs which ar... | [
{
"created": "Fri, 12 Mar 2010 05:48:36 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Mar 2010 22:46:53 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Jun 2010 04:45:05 GMT",
"version": "v3"
}
] | 2015-03-13 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"the Virgo Collaboration",
"",
""
],
[
"Abadie",
"J.",
""
],
[
"Abbott",
"B. P.",
""
],
[
"Abbott",
"R.",
""
],
[
"Abernathy",
"M",
""
],
[
"Accadia",
"T.",
... | We summarize the sensitivity achieved by the LIGO and Virgo gravitational wave detectors for compact binary coalescence (CBC) searches during LIGO's fifth science run and Virgo's first science run. We present noise spectral density curves for each of the four detectors that operated during these science runs which are ... |
0912.5384 | Robert Littlejohn | Hal M. Haggard and Robert G. Littlejohn | Asymptotics of the Wigner 9j symbol | 17 pages, 7 figures | Class.Quant.Grav.27:135010,2010 | 10.1088/0264-9381/27/13/135010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the asymptotic formula for the Wigner 9j-symbol, valid when all
quantum numbers are large, in the classically allowed region. As in the
Ponzano-Regge formula for the 6j-symbol, the action is expressed in terms of
lengths of edges and dihedral angles of a geometrical figure, but the angles
require care in d... | [
{
"created": "Tue, 29 Dec 2009 23:06:08 GMT",
"version": "v1"
}
] | 2010-05-25 | [
[
"Haggard",
"Hal M.",
""
],
[
"Littlejohn",
"Robert G.",
""
]
] | We present the asymptotic formula for the Wigner 9j-symbol, valid when all quantum numbers are large, in the classically allowed region. As in the Ponzano-Regge formula for the 6j-symbol, the action is expressed in terms of lengths of edges and dihedral angles of a geometrical figure, but the angles require care in def... |
2009.10133 | Jorge Ananias Neto | Everton M. C. Abreu and Jorge Ananias Neto | Barrow black hole corrected-entropy model and Tsallis nonextensivity | 10 pages. To be published in PLB | null | 10.1016/j.physletb.2020.135805 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum scenario concerning Hawking radiation, gives us a precious clue
that a black hole has its temperature directly connected to its area gravity
and that its entropy is proportional to the horizon area. These results have
shown that there exist a deep association between thermodynamics and gravity.
The recent... | [
{
"created": "Mon, 21 Sep 2020 18:54:44 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Abreu",
"Everton M. C.",
""
],
[
"Neto",
"Jorge Ananias",
""
]
] | The quantum scenario concerning Hawking radiation, gives us a precious clue that a black hole has its temperature directly connected to its area gravity and that its entropy is proportional to the horizon area. These results have shown that there exist a deep association between thermodynamics and gravity. The recently... |
gr-qc/0702087 | Raul Horvat | R. Horvat | Renormalization-group running cosmologies and the generalized second law | 8 pages, final version to appear in Phys. Lett. B | Phys.Lett.B648:374-377,2007 | 10.1016/j.physletb.2007.03.037 | null | gr-qc astro-ph hep-th | null | We explore some thermodynamical consequences of accelerated universes driven
by a running cosmological constant (CC) from the renormalization group (RG).
Application of the generalized second law (GSL) of gravitational thermodynamics
to a framework where the running of the CC goes at the expense of energy
transfer be... | [
{
"created": "Thu, 15 Feb 2007 11:21:00 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Feb 2007 16:07:24 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Mar 2007 09:14:32 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Horvat",
"R.",
""
]
] | We explore some thermodynamical consequences of accelerated universes driven by a running cosmological constant (CC) from the renormalization group (RG). Application of the generalized second law (GSL) of gravitational thermodynamics to a framework where the running of the CC goes at the expense of energy transfer betw... |
gr-qc/9904032 | T. Damour | T. Damour | Equivalence Principle and Clocks | 7 pages, latex, uses moriond.sty, to appear in the Proceedings of the
34th Rencontres de Moriond, "Gravitational Waves and Experimental Gravity",
January 1999 | null | null | IHES/P/99/11 | gr-qc | null | String theory suggests the existence of gravitational-strength scalar fields
("dilaton" and "moduli") whose couplings to matter violate the equivalence
principle. This provides a new motivation for high-precision clock experiments,
as well as a generic theoretical framework for analyzing their significance.
| [
{
"created": "Wed, 14 Apr 1999 13:09:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Damour",
"T.",
""
]
] | String theory suggests the existence of gravitational-strength scalar fields ("dilaton" and "moduli") whose couplings to matter violate the equivalence principle. This provides a new motivation for high-precision clock experiments, as well as a generic theoretical framework for analyzing their significance. |
1003.5640 | Alexander Kouretsis | A.P.Kouretsis, M.Stathakopoulos and P.C.Stavrinos | Imperfect fluids, Lorentz violations and Finsler Cosmology | v1:16 pages v2: extended version; section, several comments,
clarifications and references added; to appear on prd | Phys.Rev.D82:064035,2010 | 10.1103/PhysRevD.82.064035 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a cosmological toy model based on a Finslerian structure of
space-time. In particular, we are interested in a specific Finslerian Lorentz
violating theory based on a curved version of Cohen and Glashow's Very Special
Relativity. The osculation of a Finslerian manifold to a Riemannian leads to
the limit o... | [
{
"created": "Mon, 29 Mar 2010 19:02:41 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Sep 2010 14:42:51 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Kouretsis",
"A. P.",
""
],
[
"Stathakopoulos",
"M.",
""
],
[
"Stavrinos",
"P. C.",
""
]
] | We construct a cosmological toy model based on a Finslerian structure of space-time. In particular, we are interested in a specific Finslerian Lorentz violating theory based on a curved version of Cohen and Glashow's Very Special Relativity. The osculation of a Finslerian manifold to a Riemannian leads to the limit of ... |
1212.0432 | Ahmet Baykal | Ahmet Baykal | Energy definition for quadratic curvature gravities | 7 pages | Phys. Rev. D 86, 127501 (2012) | 10.1103/PhysRevD.86.127501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A conserved current for generic quadratic curvature gravitational models is
defined, and it is shown that, at the linearized level, it corresponds to the
Deser-Tekin charges. An explicit expression for the charge for new massive
gravity in three dimensions is given. Some implications of the linearized
equations are d... | [
{
"created": "Mon, 3 Dec 2012 16:20:08 GMT",
"version": "v1"
}
] | 2012-12-04 | [
[
"Baykal",
"Ahmet",
""
]
] | A conserved current for generic quadratic curvature gravitational models is defined, and it is shown that, at the linearized level, it corresponds to the Deser-Tekin charges. An explicit expression for the charge for new massive gravity in three dimensions is given. Some implications of the linearized equations are dis... |
1604.08039 | Sudipto Roy | Sudipto Roy, Mohsin Islam | A Study of Cosmic Expansion Generated by Non-conservation of Matter in
the Framework of Brans-Dicke Theory | 12 pages, 8 figures | International Journal of Physics and Mathematical Sciences, Volume
6, Number 2, pages 1-10, 2016 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present study, on the expansion of universe, is based on an assumption
regarding the possibility of inter-conversion between matter and dark energy,
through some interaction of matter with the scalar field in the framework of
Brans-Dicke theory. The field equations for a spatially flat space-time have
been solved... | [
{
"created": "Mon, 25 Apr 2016 20:00:11 GMT",
"version": "v1"
}
] | 2017-11-07 | [
[
"Roy",
"Sudipto",
""
],
[
"Islam",
"Mohsin",
""
]
] | The present study, on the expansion of universe, is based on an assumption regarding the possibility of inter-conversion between matter and dark energy, through some interaction of matter with the scalar field in the framework of Brans-Dicke theory. The field equations for a spatially flat space-time have been solved u... |
1103.0983 | Umberto Cannella | Umberto Cannella | Effective Field Theory Methods in Gravitational Physics and Tests of
Gravity | This PhD Thesis has been conducted at the University of Geneva
(Switzerland) under the direction of Professor Michele Maggiore and the
codirection of Doctor Riccardo Sturani. Version 2: abstract slightly changed;
one typo corrected; layout issue fixed | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this PhD thesis I make use of the "Effective Field Theory of Gravity for
Extended Objects" by Goldberger and Rothstein in order to investigate theories
of gravity and to take a different point of view on the physical information
that can be extracted from experiments. In the first work I present, I study a
scalar-... | [
{
"created": "Sat, 5 Mar 2011 20:34:05 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Apr 2011 16:11:32 GMT",
"version": "v2"
}
] | 2015-03-19 | [
[
"Cannella",
"Umberto",
""
]
] | In this PhD thesis I make use of the "Effective Field Theory of Gravity for Extended Objects" by Goldberger and Rothstein in order to investigate theories of gravity and to take a different point of view on the physical information that can be extracted from experiments. In the first work I present, I study a scalar-te... |
0812.0428 | Prasanta Mahato Prin. | Prasanta Mahato | Torsion and Axial Current | 13 pages, no figure | ICFAI Univ. Jour. of Phys.,2,(2009),92-104 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The role of torsion and a scalar field $\phi$ in gravitation, especially, in
the presence of a Dirac field in the background of a particular class of the
Riemann-Cartan geometry is considered here. Recently, a Lagrangian density with
Lagrange multipliers has been proposed by the author which has been obtained by
pick... | [
{
"created": "Tue, 2 Dec 2008 04:52:39 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Dec 2008 17:16:40 GMT",
"version": "v2"
}
] | 2009-09-04 | [
[
"Mahato",
"Prasanta",
""
]
] | The role of torsion and a scalar field $\phi$ in gravitation, especially, in the presence of a Dirac field in the background of a particular class of the Riemann-Cartan geometry is considered here. Recently, a Lagrangian density with Lagrange multipliers has been proposed by the author which has been obtained by pickin... |
1012.0953 | Francisco Lobo | Nadiezhda Montelongo Garc\'ia, Tiberiu Harko, Francisco S. N. Lobo,
Jos\'e P. Mimoso | f(G) modified gravity and the energy conditions | 4 pages. Prepared for the proceedings of the Spanish Relativity
meeting (ERE2010), Granada, Spain, 6-10 Sep 2010 | J.Phys.Conf.Ser.314:012060,2011 | 10.1088/1742-6596/314/1/012056 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by string/M-theory predictions that scalar field couplings with the
Gauss-Bonnet invariant, G, are essential in the appearance of non-singular
early time cosmologies, we discuss the viability of an interesting alternative
gravitational theory, namely, modified Gauss-Bonnet gravity, and present the
viability... | [
{
"created": "Sat, 4 Dec 2010 22:24:39 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"García",
"Nadiezhda Montelongo",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Mimoso",
"José P.",
""
]
] | Motivated by string/M-theory predictions that scalar field couplings with the Gauss-Bonnet invariant, G, are essential in the appearance of non-singular early time cosmologies, we discuss the viability of an interesting alternative gravitational theory, namely, modified Gauss-Bonnet gravity, and present the viability b... |
2301.05083 | Karim Mosani | Karim Mosani, Koushiki, Pankaj S. Joshi, Jay Verma Trivedi, and
Tapobroto Bhanja | Gravitational collapse of scalar and vector fields | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study here the unhindered gravitational collapse of spatially homogeneous
(SH) scalar fields $\phi$ with a potential $V_{s}(\phi)$, as well as vector
fields $\tilde{A}$ with a potential $V_{v}(B)$ where $B=g(\tilde{A},\tilde{A})$
and $g$ is the metric tensor. We show that in both cases, classes of potentials
exist... | [
{
"created": "Thu, 12 Jan 2023 15:33:21 GMT",
"version": "v1"
}
] | 2023-01-13 | [
[
"Mosani",
"Karim",
""
],
[
"Koushiki",
"",
""
],
[
"Joshi",
"Pankaj S.",
""
],
[
"Trivedi",
"Jay Verma",
""
],
[
"Bhanja",
"Tapobroto",
""
]
] | We study here the unhindered gravitational collapse of spatially homogeneous (SH) scalar fields $\phi$ with a potential $V_{s}(\phi)$, as well as vector fields $\tilde{A}$ with a potential $V_{v}(B)$ where $B=g(\tilde{A},\tilde{A})$ and $g$ is the metric tensor. We show that in both cases, classes of potentials exist t... |
gr-qc/9812045 | Massar Serge | S. Massar and R. Parentani | Unitary and non-unitary evolution in quantum cosmology | 26 pages, latex; minor corrections, final version to appear in Phys.
Rev. D | Phys. Rev. D 59, 123519 (1999) | 10.1103/PhysRevD.59.123519 | ULB-TH/98-17 | gr-qc | null | We analyse when and why unitarity violations might occur in quantum cosmology
restricted to minisuperspace. To this end we discuss in detail backscattering
transitions between expanding and contracting solutions of the Wheeler-DeWitt
equation. We first show that upon neglecting only backscattering, one obtains
an int... | [
{
"created": "Mon, 14 Dec 1998 11:26:46 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Apr 1999 07:56:16 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Massar",
"S.",
""
],
[
"Parentani",
"R.",
""
]
] | We analyse when and why unitarity violations might occur in quantum cosmology restricted to minisuperspace. To this end we discuss in detail backscattering transitions between expanding and contracting solutions of the Wheeler-DeWitt equation. We first show that upon neglecting only backscattering, one obtains an inter... |
2401.11273 | Vasilis Oikonomou | V.K. Oikonomou, Pyotr Tsyba, Olga Razina | Einstein-Gauss-Bonnet Cosmological Theories at Reheating and at the End
of the Inflationary Era | AoP accepted | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the GW170817-compatible Einstein-Gauss-Bonnet theories
during the reheating and the end of inflationary era. Given the scalar field
potential $V(\phi)$ which can have some intrinsic importance for the theory,
determining the scalar coupling function $\xi(\phi)$ can be cumbersome due to
lack of a... | [
{
"created": "Sat, 20 Jan 2024 17:03:04 GMT",
"version": "v1"
}
] | 2024-01-23 | [
[
"Oikonomou",
"V. K.",
""
],
[
"Tsyba",
"Pyotr",
""
],
[
"Razina",
"Olga",
""
]
] | In this work we study the GW170817-compatible Einstein-Gauss-Bonnet theories during the reheating and the end of inflationary era. Given the scalar field potential $V(\phi)$ which can have some intrinsic importance for the theory, determining the scalar coupling function $\xi(\phi)$ can be cumbersome due to lack of ana... |
1707.00255 | Thomas Cailleteau Mr | Thomas Cailleteau | Langton's Ant from the Ant's referential | First part of the work | null | null | null | gr-qc nlin.CG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution of the Langton's ant on a 2D lattice is studied from the "ant's
framework". The aim of this article is twofold. Firstly, to see if one can
explain the emergent behaviour of the ant as an analogous sytem of a particle
crossing an horizon. Secondly, pointing toward some directions for an
explanation, the ... | [
{
"created": "Sun, 2 Jul 2017 08:18:05 GMT",
"version": "v1"
}
] | 2017-07-04 | [
[
"Cailleteau",
"Thomas",
""
]
] | The evolution of the Langton's ant on a 2D lattice is studied from the "ant's framework". The aim of this article is twofold. Firstly, to see if one can explain the emergent behaviour of the ant as an analogous sytem of a particle crossing an horizon. Secondly, pointing toward some directions for an explanation, the ev... |
2404.05677 | Bruce Allen | Bruce Allen | Pulsar Timing Array Harmonic Analysis and Source Angular Correlations | Updated with citations to recent work by others; shifted to
covariance C(O.O') to unify notation with [51]. 22 pages, 1 figure | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves (GWs) influence the arrival times of radio signals coming
from pulsars. Here, we investigate the harmonic space approach to describing a
pulsar's response to GWs. We derive and discuss the "diagonalized form" of the
response, which is a sum of spin-2-weighted spherical harmonics of the GW
directio... | [
{
"created": "Mon, 8 Apr 2024 16:56:45 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Apr 2024 16:42:34 GMT",
"version": "v2"
}
] | 2024-04-30 | [
[
"Allen",
"Bruce",
""
]
] | Gravitational waves (GWs) influence the arrival times of radio signals coming from pulsars. Here, we investigate the harmonic space approach to describing a pulsar's response to GWs. We derive and discuss the "diagonalized form" of the response, which is a sum of spin-2-weighted spherical harmonics of the GW direction ... |
1208.3796 | Stanley P. Gudder | Stanley P Gudder | The Causal Poset is Directed but not Lattice Ordered | The counterexample is incorrect. Thanks to Rafael Sorkin and David
Rideout for pointing this out | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the causal set approach to discrete quantum gravity the universe grows one
element at a time in discrete steps. At each step the process has the form of a
causal set (causet) and the "completed" universe is given by a path through a
discretely growing chain of causets. The collection of causets forms a
partially o... | [
{
"created": "Sun, 19 Aug 2012 01:10:24 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Sep 2013 18:49:40 GMT",
"version": "v2"
}
] | 2013-10-01 | [
[
"Gudder",
"Stanley P",
""
]
] | In the causal set approach to discrete quantum gravity the universe grows one element at a time in discrete steps. At each step the process has the form of a causal set (causet) and the "completed" universe is given by a path through a discretely growing chain of causets. The collection of causets forms a partially ord... |
0811.4129 | Martin Bojowald | Martin Bojowald | Consistent Loop Quantum Cosmology | 13 pages | Class.Quant.Grav.26:075020,2009 | 10.1088/0264-9381/26/7/075020 | IGC-08/11-5 | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A consistent combination of quantum geometry effects rules out a large class
of models of loop quantum cosmology and their critical densities as they have
been used in the recent literature. In particular, the critical density at
which an isotropic universe filled with a free, massless scalar field would
bounce must ... | [
{
"created": "Tue, 25 Nov 2008 16:58:46 GMT",
"version": "v1"
}
] | 2009-03-27 | [
[
"Bojowald",
"Martin",
""
]
] | A consistent combination of quantum geometry effects rules out a large class of models of loop quantum cosmology and their critical densities as they have been used in the recent literature. In particular, the critical density at which an isotropic universe filled with a free, massless scalar field would bounce must be... |
0709.3302 | Salvador Robles-Perez | S. Robles-Perez, Y. Hassouni and P. F. Gonzalez-Diaz | Coherent states in quantum cosmology | 6 pages, 2 figures | null | null | null | gr-qc | null | In the realm of a quantum cosmological model for dark energy in which we have
been able to construct a well-defined Hilbert space, a consistent coherent
state representation has been formulated that may describe the quantum state of
the universe and has a well-behaved semiclassical limit.
| [
{
"created": "Thu, 20 Sep 2007 20:16:17 GMT",
"version": "v1"
}
] | 2007-09-24 | [
[
"Robles-Perez",
"S.",
""
],
[
"Hassouni",
"Y.",
""
],
[
"Gonzalez-Diaz",
"P. F.",
""
]
] | In the realm of a quantum cosmological model for dark energy in which we have been able to construct a well-defined Hilbert space, a consistent coherent state representation has been formulated that may describe the quantum state of the universe and has a well-behaved semiclassical limit. |
gr-qc/9508027 | Yoav Peleg | Sukanta Bose, Leonard Parker and Yoav Peleg (UWM) | Hawking Radiation and Unitary evolution | LaTex file + uuencoded ps version including 4 figures | Phys.Rev.Lett. 76 (1996) 861-864 | 10.1103/PhysRevLett.76.861 | WISC-MILW-95-TH-17 | gr-qc hep-th | null | We find a family of exact solutions to the semi-classical equations
(including back-reaction) of two-dimensional dilaton gravity, describing
infalling null matter that becomes outgoing and returns to infinity without
forming a black hole. When a black hole almost forms, the radiation reaching
infinity in advance of t... | [
{
"created": "Thu, 10 Aug 1995 21:55:43 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Aug 1995 16:10:39 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Bose",
"Sukanta",
"",
"UWM"
],
[
"Parker",
"Leonard",
"",
"UWM"
],
[
"Peleg",
"Yoav",
"",
"UWM"
]
] | We find a family of exact solutions to the semi-classical equations (including back-reaction) of two-dimensional dilaton gravity, describing infalling null matter that becomes outgoing and returns to infinity without forming a black hole. When a black hole almost forms, the radiation reaching infinity in advance of the... |
2105.10178 | Pedro Bargue\~no | Pedro Bargueno, Ernesto Contreras and Angel Rincon | Thermodynamics of scale-dependent Friedmann equations | To be published in EPJC | null | 10.1140/epjc/s10052-021-09274-7 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, the role of a time-varying Newton constant under the
scale-dependent approach is investigated in the thermodynamics of the Friedman
equations. In particular, we show that the extended Friedman equations can be
derived either from equilibrium thermodynamics when the non-matter energy
momentum tensor is i... | [
{
"created": "Fri, 21 May 2021 07:37:53 GMT",
"version": "v1"
}
] | 2021-06-16 | [
[
"Bargueno",
"Pedro",
""
],
[
"Contreras",
"Ernesto",
""
],
[
"Rincon",
"Angel",
""
]
] | In this work, the role of a time-varying Newton constant under the scale-dependent approach is investigated in the thermodynamics of the Friedman equations. In particular, we show that the extended Friedman equations can be derived either from equilibrium thermodynamics when the non-matter energy momentum tensor is int... |
2207.14652 | Mikhail Altaisky | Mikhail Altaisky and Robin Raj | Can our spacetime emerge from anti -- de Sitter space? | LaTeX, 4 pages, 2 eps figures | Physics of Particles and Nuclei Letters, 2022, vol.19, No 4,
pp.313-316 | 10.1134/S1547477122040033 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We present a model showing that our four-dimensional spacetime with the
signature $(+,-,-,-)$ and almost vanishing positive curvature may have
originated from a $b$-ary tree-like branching of a single discrete entity, and
the $AdS_5$ space related to this branching process.
| [
{
"created": "Wed, 27 Jul 2022 05:23:35 GMT",
"version": "v1"
}
] | 2022-08-01 | [
[
"Altaisky",
"Mikhail",
""
],
[
"Raj",
"Robin",
""
]
] | We present a model showing that our four-dimensional spacetime with the signature $(+,-,-,-)$ and almost vanishing positive curvature may have originated from a $b$-ary tree-like branching of a single discrete entity, and the $AdS_5$ space related to this branching process. |
0801.4584 | Abel Camacho Mr. | Alfredo Macias, Abel Camacho, Jutta Kunz, Claus Laemmerzahl | Midisuperspace Supersymmetric Quantum Cosmology | Accepted in Physical Review D | Phys.Rev.D77:064009,2008 | 10.1103/PhysRevD.77.064009 | null | gr-qc | null | We investigate the canonical quantization in the framework of N=1 simple
supergravity for the case of a very simple gravitational midisuperspace
described by Gowdy $T^3$ cosmological models. We consider supersymmetric
quantum cosmology in the mentioned midisuperspace, where a matrix
representation for the gravitino c... | [
{
"created": "Tue, 29 Jan 2008 23:58:42 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Macias",
"Alfredo",
""
],
[
"Camacho",
"Abel",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Laemmerzahl",
"Claus",
""
]
] | We investigate the canonical quantization in the framework of N=1 simple supergravity for the case of a very simple gravitational midisuperspace described by Gowdy $T^3$ cosmological models. We consider supersymmetric quantum cosmology in the mentioned midisuperspace, where a matrix representation for the gravitino cov... |
gr-qc/0611022 | Kirill Bronnikov | K.A. Bronnikov, H. Dehnen, V.N. Melnikov | Regular black holes and black universes | 13 pages, 1 figure. 6 referenses and some discussion added, misprints
corrected | Gen.Rel.Grav.39:973-987,2007 | 10.1007/s10714-007-0430-6 | null | gr-qc | null | We give a comparative description of different types of regular static,
spherically symmetric black holes (BHs) and discuss in more detail their
particular type, which we suggest to call black universes. The latter have a
Schwarzschild-like causal structure, but inside the horizon there is an
expanding Kantowski-Sach... | [
{
"created": "Fri, 3 Nov 2006 15:28:27 GMT",
"version": "v1"
},
{
"created": "Sun, 12 Nov 2006 18:08:31 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Dehnen",
"H.",
""
],
[
"Melnikov",
"V. N.",
""
]
] | We give a comparative description of different types of regular static, spherically symmetric black holes (BHs) and discuss in more detail their particular type, which we suggest to call black universes. The latter have a Schwarzschild-like causal structure, but inside the horizon there is an expanding Kantowski-Sachs ... |
2103.10555 | Jens Boos | Jens Boos, Ivan Kol\'a\v{r} | Non-locality and gravitoelectromagnetic duality | 8 pages, comments welcome! | Phys. Rev. D 104, 024018 (2021) | 10.1103/PhysRevD.104.024018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The weak-field Schwarzschild and NUT solutions of general relativity are
gravitoelectromagnetically dual to each other, except on the positive $z$-axis.
The presence of non-locality weakens this duality and violates it within a
smeared region around the positive $z$-axis, whose typical transverse size is
given by the... | [
{
"created": "Thu, 18 Mar 2021 22:51:38 GMT",
"version": "v1"
}
] | 2021-07-14 | [
[
"Boos",
"Jens",
""
],
[
"Kolář",
"Ivan",
""
]
] | The weak-field Schwarzschild and NUT solutions of general relativity are gravitoelectromagnetically dual to each other, except on the positive $z$-axis. The presence of non-locality weakens this duality and violates it within a smeared region around the positive $z$-axis, whose typical transverse size is given by the s... |
gr-qc/9705085 | Alexander L. Gromov | Vladik Kreinovich and R. R. Zapatrin | An operationalistic reformulation of Einstein's equivalence principle | latex | null | null | IRB-MSP-970530 | gr-qc | null | The Einstein's equivalence principle is formulated in terms of the accuracy
of measurements and its dependence of the size of the area of measurement. It
is shown that different refinements of the statement 'the spacetime is locally
flat' lead to different conculsions about the spacetime geometry.
| [
{
"created": "Fri, 30 May 1997 20:30:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kreinovich",
"Vladik",
""
],
[
"Zapatrin",
"R. R.",
""
]
] | The Einstein's equivalence principle is formulated in terms of the accuracy of measurements and its dependence of the size of the area of measurement. It is shown that different refinements of the statement 'the spacetime is locally flat' lead to different conculsions about the spacetime geometry. |
1604.00075 | Jonah Miller | Jonah M. Miller and Erik Schnetter | An Operator-Based Local Discontinuous Galerkin Method Compatible With
the BSSN Formulation of the Einstein Equations | Incorporated referee comments during peer-review. Added several
references pointed out to us. Added a figure and discussion comparing
pointwise error for 4th- and 5th-order stencils for wave equation | Class. Quantum Grav. 34 (2017) 1 | 10.1088/1361-6382/34/1/015003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Discontinuous Galerkin Finite Element (DGFE) methods offer a mathematically
beautiful, computationally efficient, and efficiently parallelizable way to
solve hyperbolic partial differential equations. These properties make them
highly desirable for numerical calculations in relativistic astrophysics and
many other fi... | [
{
"created": "Thu, 31 Mar 2016 23:06:49 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2016 16:24:58 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Nov 2016 23:00:37 GMT",
"version": "v3"
}
] | 2016-12-12 | [
[
"Miller",
"Jonah M.",
""
],
[
"Schnetter",
"Erik",
""
]
] | Discontinuous Galerkin Finite Element (DGFE) methods offer a mathematically beautiful, computationally efficient, and efficiently parallelizable way to solve hyperbolic partial differential equations. These properties make them highly desirable for numerical calculations in relativistic astrophysics and many other fiel... |
0710.5656 | Sergey Sushkov | P.E. Kashargin and S.V. Sushkov | Slowly rotating wormholes: the first order approximation | 7 pages, 2 figures, submitted to Gravitation and Cosmology | Grav.Cosmol.14:80-85,2008 | 10.1007/s12267-008-1010-y | null | gr-qc | null | We discuss a solution describing a rotating wormhole in the theory of gravity
with a scalar field with negative kinetic energy. To solve the problem we use
the assumption about slow rotation. The role of a small dimensionless parameter
plays the ratio of the linear velocity of rotation of the wormhole's throat and
th... | [
{
"created": "Tue, 30 Oct 2007 14:26:53 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Kashargin",
"P. E.",
""
],
[
"Sushkov",
"S. V.",
""
]
] | We discuss a solution describing a rotating wormhole in the theory of gravity with a scalar field with negative kinetic energy. To solve the problem we use the assumption about slow rotation. The role of a small dimensionless parameter plays the ratio of the linear velocity of rotation of the wormhole's throat and the ... |
2111.05732 | Javier Bad\'ia | Javier Bad\'ia, Ernesto F. Eiroa | Shadow of a charged black hole surrounded by an anisotropic matter field | 8 pages, 5 figures; prepared for the Proceedings of the Sixteenth
Marcel Grossmann Meeting - MG16 | Proceedings of the Sixteenth Marcel Grossmann Meeting (MG16),
pages 1343-1350 (World Scientific, Singapore, 2023) | 10.1142/9789811269776_0108 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A certain type of matter with anisotropic pressures can add to the
Reissner-Nordstr\"om metric a term proportional to a power of the radial
coordinate. Using the standard method of separating variables for the
Hamilton-Jacobi equation, we study the shadow of the corresponding rotating
solution, obtained through the N... | [
{
"created": "Wed, 10 Nov 2021 15:13:43 GMT",
"version": "v1"
}
] | 2023-01-30 | [
[
"Badía",
"Javier",
""
],
[
"Eiroa",
"Ernesto F.",
""
]
] | A certain type of matter with anisotropic pressures can add to the Reissner-Nordstr\"om metric a term proportional to a power of the radial coordinate. Using the standard method of separating variables for the Hamilton-Jacobi equation, we study the shadow of the corresponding rotating solution, obtained through the New... |
gr-qc/0201087 | Sergey Alexandrov | Sergei Alexandrov | Hilbert space structure of covariant loop quantum gravity | 20 pages, RevTEX | Phys.Rev. D66 (2002) 024028 | 10.1103/PhysRevD.66.024028 | null | gr-qc | null | We investigate the Hilbert space in the Lorentz covariant approach to loop
quantum gravity. We restrict ourselves to the space where all area operators
are simultaneously diagonalizable, assuming that it exists. In this sector
quantum states are realized by a generalization of spin network states based on
Lorentz Wil... | [
{
"created": "Mon, 28 Jan 2002 21:33:37 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Alexandrov",
"Sergei",
""
]
] | We investigate the Hilbert space in the Lorentz covariant approach to loop quantum gravity. We restrict ourselves to the space where all area operators are simultaneously diagonalizable, assuming that it exists. In this sector quantum states are realized by a generalization of spin network states based on Lorentz Wilso... |
2105.13260 | Marcus Khuri | Marcus Khuri, Gilbert Weinstein, Sumio Yamada | Balancing Static Vacuum Black Holes with Signed Masses in 4 and 5
Dimensions | 35 pages, 7 figures | Phys. Rev. D 104, 044063 (2021) | 10.1103/PhysRevD.104.044063 | null | gr-qc hep-th math.DG | http://creativecommons.org/licenses/by/4.0/ | We construct a new set of asymptotically flat, static vacuum solutions to the
Einstein equations in dimensions 4 and 5, which may be interpreted as a
superposition of positive and negative mass black holes. The resulting
spacetimes are axisymmetric in 4-dimensions and bi-axisymmetric in
5-dimensions, and are regular ... | [
{
"created": "Thu, 27 May 2021 15:56:54 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Aug 2021 19:22:05 GMT",
"version": "v2"
}
] | 2021-09-01 | [
[
"Khuri",
"Marcus",
""
],
[
"Weinstein",
"Gilbert",
""
],
[
"Yamada",
"Sumio",
""
]
] | We construct a new set of asymptotically flat, static vacuum solutions to the Einstein equations in dimensions 4 and 5, which may be interpreted as a superposition of positive and negative mass black holes. The resulting spacetimes are axisymmetric in 4-dimensions and bi-axisymmetric in 5-dimensions, and are regular aw... |
gr-qc/9804056 | George Lavrelashvili | George Lavrelashvili | On the quadratic action of the Hawking-Turok instanton | 8 pages, REVTeX, 4 eps figures (included); statement concerning the
CD solution is corrected and few other minor changes are made | Phys. Rev. D 58, 063505 (1998) | 10.1103/PhysRevD.58.063505 | BUTP-98/12 | gr-qc hep-th | null | Positive definiteness of the quadratic part of the action of the
Hawking-Turok instanton is investigated. The Euclidean quadratic action for
scalar perturbations is expressed in terms of a single gauge invariant quantity
$q$. The mode functions satisfy a Schr\"odinger type equation with a potential
$U$. It is shown t... | [
{
"created": "Wed, 22 Apr 1998 18:12:39 GMT",
"version": "v1"
},
{
"created": "Fri, 1 May 1998 21:32:00 GMT",
"version": "v2"
}
] | 2016-08-25 | [
[
"Lavrelashvili",
"George",
""
]
] | Positive definiteness of the quadratic part of the action of the Hawking-Turok instanton is investigated. The Euclidean quadratic action for scalar perturbations is expressed in terms of a single gauge invariant quantity $q$. The mode functions satisfy a Schr\"odinger type equation with a potential $U$. It is shown tha... |
2106.10425 | Pramit Rej | Piyali Bhar, Pramit Rej, P. Mafa Takisa, and M. Zubair | Relativistic compact stars in Tolman spacetime via an anisotropic
approach | 18 Pages, 8 Figures, Accepted in European Physical Journal C on
12.06.2021 | The European Physical Journal C 81, 531 (2021) | 10.1140/epjc/s10052-021-09340-0 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this present work, we have obtained a singularity-free spherically
symmetric stellar model with anisotropic pressure in the background of
Einstein's general theory of relativity. The Einstein's field equations have
been solved by exploiting Tolman {\em ansatz} [Richard C Tolman, Phys. Rev.
55:364, 1939] in $(3+1)$... | [
{
"created": "Sat, 19 Jun 2021 05:22:30 GMT",
"version": "v1"
}
] | 2021-06-23 | [
[
"Bhar",
"Piyali",
""
],
[
"Rej",
"Pramit",
""
],
[
"Takisa",
"P. Mafa",
""
],
[
"Zubair",
"M.",
""
]
] | In this present work, we have obtained a singularity-free spherically symmetric stellar model with anisotropic pressure in the background of Einstein's general theory of relativity. The Einstein's field equations have been solved by exploiting Tolman {\em ansatz} [Richard C Tolman, Phys. Rev. 55:364, 1939] in $(3+1)$-d... |
1502.04640 | Jonathan Engle | Jonathan Engle and Antonia Zipfel | The Lorentzian proper vertex amplitude: Classical analysis and quantum
derivation | 36 pages; references corrected | Phys. Rev. D 94, 064024 (2016) | 10.1103/PhysRevD.94.064024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin foam models, an approach to defining the dynamics of loop quantum
gravity, make use of the Plebanski formulation of gravity, in which gravity is
recovered from a topological field theory via certain constraints called
simplicity constraints. However, the simplicity constraints in their usual form
select more tha... | [
{
"created": "Mon, 16 Feb 2015 17:28:27 GMT",
"version": "v1"
},
{
"created": "Tue, 31 May 2016 12:20:16 GMT",
"version": "v2"
}
] | 2016-09-14 | [
[
"Engle",
"Jonathan",
""
],
[
"Zipfel",
"Antonia",
""
]
] | Spin foam models, an approach to defining the dynamics of loop quantum gravity, make use of the Plebanski formulation of gravity, in which gravity is recovered from a topological field theory via certain constraints called simplicity constraints. However, the simplicity constraints in their usual form select more than ... |
1206.5413 | Jose Socorro Garcia | Juan M. Ram\'irez and J. Socorro | FRW in cosmological self-creation theory | 10 pages in latex, 4 figures | acepted in Int. J. of Theor. Phys. (2013) | 10.1007/s10773-013-1580-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the Brans-Dicke theory from the framework of General Relativity
(Einstein frame), but now the total energy momentum tensor fulfills the
following condition $\rm <[\{1}{\phi}T^{\mu \nu M}+T^{\mu
\nu}(\phi)>]_{;\nu}=0$. We take as a first model the flat FRW metric and with
the law of variation for Hubble's param... | [
{
"created": "Sat, 23 Jun 2012 17:02:10 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2013 20:45:16 GMT",
"version": "v2"
}
] | 2013-05-09 | [
[
"Ramírez",
"Juan M.",
""
],
[
"Socorro",
"J.",
""
]
] | We use the Brans-Dicke theory from the framework of General Relativity (Einstein frame), but now the total energy momentum tensor fulfills the following condition $\rm <[\{1}{\phi}T^{\mu \nu M}+T^{\mu \nu}(\phi)>]_{;\nu}=0$. We take as a first model the flat FRW metric and with the law of variation for Hubble's paramet... |
2005.01784 | Olesya Galkina | Olesya Galkina, Alexander Yu. Kamenshchik | Future soft singularities, Born-Infeld-like fields and particles | 13 pages, 1 figure. Final version to be published in PRD | Phys. Rev. D 102, 024078 (2020) | 10.1103/PhysRevD.102.024078 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider different scenarios of the evolution of the universe, where the
singularities or some non-analyticities in the geometry of the spacetime are
present, trying to answer the following question: is it possible to conserve
some kind of notion of particle corresponding to a chosen quantum field present
in the u... | [
{
"created": "Mon, 4 May 2020 18:43:35 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jul 2020 18:45:48 GMT",
"version": "v2"
}
] | 2020-08-05 | [
[
"Galkina",
"Olesya",
""
],
[
"Kamenshchik",
"Alexander Yu.",
""
]
] | We consider different scenarios of the evolution of the universe, where the singularities or some non-analyticities in the geometry of the spacetime are present, trying to answer the following question: is it possible to conserve some kind of notion of particle corresponding to a chosen quantum field present in the uni... |
2311.17993 | Mehrab Momennia | Diego A. Martinez-Valera, Mehrab Momennia, Alfredo Herrera-Aguilar | Observational redshift from general spherically symmetric black holes | 9 pages with 3 captioned figures. Comments are welcome; V2: Published
version | Eur. Phys. J. C 84 (2024) 288 | 10.1140/epjc/s10052-024-12649-1 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we obtain an expression for the total observational frequency
shift of photons emitted by massive geodesic particles circularly orbiting a
black hole in a general spherically symmetric background. Our general relations
are presented in terms of the metric components and their derivatives that
characteri... | [
{
"created": "Wed, 29 Nov 2023 19:00:00 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Mar 2024 22:32:17 GMT",
"version": "v2"
}
] | 2024-03-26 | [
[
"Martinez-Valera",
"Diego A.",
""
],
[
"Momennia",
"Mehrab",
""
],
[
"Herrera-Aguilar",
"Alfredo",
""
]
] | In this work, we obtain an expression for the total observational frequency shift of photons emitted by massive geodesic particles circularly orbiting a black hole in a general spherically symmetric background. Our general relations are presented in terms of the metric components and their derivatives that characterize... |
1904.05109 | Kodai Ueda | Vitor Cardoso, Takahisa Igata, Akihiro Ishibashi and Kodai Ueda | Massive tensor field perturbations on extremal and near-extremal static
black holes | no figure, 24 pages | Phys. Rev. D 100, 044013 (2019) | 10.1103/PhysRevD.100.044013 | RUP-19-12 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a new perturbation method to study the dynamics of massive tensor
fields on extremal and near-extremal static black hole spacetimes in arbitrary
dimensions. On such backgrounds, one can classify the components of massive
tensor fields into the tensor, vector, and scalar-type components. For the
tensor-type... | [
{
"created": "Wed, 10 Apr 2019 11:07:39 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Cardoso",
"Vitor",
""
],
[
"Igata",
"Takahisa",
""
],
[
"Ishibashi",
"Akihiro",
""
],
[
"Ueda",
"Kodai",
""
]
] | We develop a new perturbation method to study the dynamics of massive tensor fields on extremal and near-extremal static black hole spacetimes in arbitrary dimensions. On such backgrounds, one can classify the components of massive tensor fields into the tensor, vector, and scalar-type components. For the tensor-type c... |
2201.12295 | Jan Sbierski | Jan Sbierski | Instability of the Kerr Cauchy horizon under linearised gravitational
perturbations | 102 pages, 9 figures; v2 accepted for publication in Annals of PDE | null | null | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper establishes a mathematical proof of the blue-shift instability at
the sub-extremal Kerr Cauchy horizon for the linearised vacuum Einstein
equations. More precisely, we exhibit conditions on the $s=+2$ Teukolsky field,
consisting of suitable integrated upper and lower bounds on the decay along the
event hor... | [
{
"created": "Fri, 28 Jan 2022 18:00:05 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Mar 2023 09:38:27 GMT",
"version": "v2"
}
] | 2023-03-22 | [
[
"Sbierski",
"Jan",
""
]
] | This paper establishes a mathematical proof of the blue-shift instability at the sub-extremal Kerr Cauchy horizon for the linearised vacuum Einstein equations. More precisely, we exhibit conditions on the $s=+2$ Teukolsky field, consisting of suitable integrated upper and lower bounds on the decay along the event horiz... |
1903.10879 | Peter Hess O | Peter O. Hess | Review on the pseudo-complex General Relativity and dark energy | 24 pages10 figures, contribution to "Dark Matter and Dark Energy in
General Relativity and Modified Theories of Gravity", Advances in High Energy
Physics, Hindawi | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A review will be presented on the algebraic extension of the standard Theory
of Relativity (GR) to the pseudo-complex formulation (pc-GR). The pc-GR
predicts the existence of a dark energy outside and inside the mass
distribution, corresponding to a modification of the GR- metric. The structure
of the emission profil... | [
{
"created": "Mon, 25 Mar 2019 16:49:08 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Hess",
"Peter O.",
""
]
] | A review will be presented on the algebraic extension of the standard Theory of Relativity (GR) to the pseudo-complex formulation (pc-GR). The pc-GR predicts the existence of a dark energy outside and inside the mass distribution, corresponding to a modification of the GR- metric. The structure of the emission profile ... |
2212.13311 | Chen-Kai Qiao | Chen-Kai Qiao, Mi Zhou | Gravitational Lensing of Schwarzschild and Charged Black Holes Immersed
in Perfect Fluid Dark Matter Halo | 31 pages, 10 figures; V2 minor revision; V3 major revision (some
errors removed) | JCAP 12 (2023) 005 | 10.1088/1475-7516/2023/12/005 | null | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Dark matter and dark energy dominate the behavior of our universe. The dark
matter usually forms halo structures in large number of galaxies. Properties of
dark matter halo can be revealed and understood from the gravitational lensing
observations. In this work, a comprehensive study on the gravitational lensing
of b... | [
{
"created": "Mon, 26 Dec 2022 22:26:38 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2023 17:04:19 GMT",
"version": "v2"
},
{
"created": "Mon, 23 Oct 2023 21:02:45 GMT",
"version": "v3"
}
] | 2024-03-12 | [
[
"Qiao",
"Chen-Kai",
""
],
[
"Zhou",
"Mi",
""
]
] | Dark matter and dark energy dominate the behavior of our universe. The dark matter usually forms halo structures in large number of galaxies. Properties of dark matter halo can be revealed and understood from the gravitational lensing observations. In this work, a comprehensive study on the gravitational lensing of bla... |
2210.00295 | Kun Meng | Kun Meng and Shao-Jun Zhang | Gravito-Electromagnetic Perturbations and QNMs of Regular Black Holes | 21 pages, 2 figures, 3 tables, references added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of Einstein's gravity coupled to nonlinear electromagnetic
fields, we study gravito-electromagnetic perturbations of magnetic regular
black holes. The master equations of perturbations are obtained through
Chandrasekhar's procedure, in which gravitational perturbations with odd-parity
are coupled to ... | [
{
"created": "Sat, 1 Oct 2022 14:58:13 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Oct 2022 14:44:21 GMT",
"version": "v2"
}
] | 2022-10-11 | [
[
"Meng",
"Kun",
""
],
[
"Zhang",
"Shao-Jun",
""
]
] | In the framework of Einstein's gravity coupled to nonlinear electromagnetic fields, we study gravito-electromagnetic perturbations of magnetic regular black holes. The master equations of perturbations are obtained through Chandrasekhar's procedure, in which gravitational perturbations with odd-parity are coupled to th... |
gr-qc/0111035 | Gian Paolo Vacca | F. Finelli, G. Marozzi, G. P. Vacca and G. Venturi | Energy-Momentum Tensor of Field Fluctuations in Massive Chaotic
Inflation | revtex style, 24 pages, 6 eps figures Numerical checks added and
moduli section improved | Phys.Rev.D65:103521,2002 | 10.1103/PhysRevD.65.103521 | null | gr-qc astro-ph hep-ph hep-th | null | We study the renormalized energy-momentum tensor (EMT) of the inflaton
fluctuations in rigid space-times during the slow-rollover regime for chaotic
inflation with a mass term. We use dimensional regularization with adiabatic
subtraction and introduce a novel analytic approximation for the inflaton
fluctuations which... | [
{
"created": "Tue, 13 Nov 2001 14:19:41 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Nov 2001 12:39:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Finelli",
"F.",
""
],
[
"Marozzi",
"G.",
""
],
[
"Vacca",
"G. P.",
""
],
[
"Venturi",
"G.",
""
]
] | We study the renormalized energy-momentum tensor (EMT) of the inflaton fluctuations in rigid space-times during the slow-rollover regime for chaotic inflation with a mass term. We use dimensional regularization with adiabatic subtraction and introduce a novel analytic approximation for the inflaton fluctuations which i... |
1712.08444 | A. Yu. Petrov | J. R. Nascimento, A. Yu. Petrov, P. J. Porfirio | Traversable wormholes in Chern-Simons modified gravity | 18 pages, 2 figures, revised version | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we examine the existence of traversable wormhole solutions
within the Chern-Simons modified gravity. We find a non-trivial solution in the
theory with dynamical Chern-Simons coefficient in the absence of matter
sources. This result displays a situation opposite to GR where the matter
sources violating ... | [
{
"created": "Fri, 22 Dec 2017 13:53:55 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2018 13:52:13 GMT",
"version": "v2"
}
] | 2018-01-10 | [
[
"Nascimento",
"J. R.",
""
],
[
"Petrov",
"A. Yu.",
""
],
[
"Porfirio",
"P. J.",
""
]
] | In this paper, we examine the existence of traversable wormhole solutions within the Chern-Simons modified gravity. We find a non-trivial solution in the theory with dynamical Chern-Simons coefficient in the absence of matter sources. This result displays a situation opposite to GR where the matter sources violating th... |
1212.3699 | Shan Bai | Shan Bai, Niall \'O Murchadha | Scaling up the extrinsic curvature in asymptotically flat gravitational
initial data: Generating trapped surfaces | 10 pages, accepted for publication in CQG | null | 10.1088/0264-9381/30/2/025013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of the initial value constraints means that specifying initial
data for the Einstein equations is non-trivial. The standard method of
constructing initial data in the asymptotically flat case is to choose an
asymptotically flat 3-metric and a transverse-tracefree (TT) tensor on it. One
can find a confor... | [
{
"created": "Sat, 15 Dec 2012 16:23:42 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Bai",
"Shan",
""
],
[
"Murchadha",
"Niall Ó",
""
]
] | The existence of the initial value constraints means that specifying initial data for the Einstein equations is non-trivial. The standard method of constructing initial data in the asymptotically flat case is to choose an asymptotically flat 3-metric and a transverse-tracefree (TT) tensor on it. One can find a conforma... |
2402.11348 | Ayan Banerjee | Ayan Banerjee, Sudan Hansraj, Anirudh Pradhan and Abdelghani Errehymy | Is dark energy necessary for the sustainability of traversable
wormholes? | 18 pages, 10 figures, updated discussion, added references | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the standard approach to studying wormhole geometry, the presence of dark
energy is unavoidable to ensure traversability. The dark energy provides the
negative gravity effect to keep the throat open. The question we analyse is
whether the same can be achieved without dark energy. It turns out that if we
couple the... | [
{
"created": "Sat, 17 Feb 2024 17:51:03 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Apr 2024 09:17:06 GMT",
"version": "v2"
}
] | 2024-04-26 | [
[
"Banerjee",
"Ayan",
""
],
[
"Hansraj",
"Sudan",
""
],
[
"Pradhan",
"Anirudh",
""
],
[
"Errehymy",
"Abdelghani",
""
]
] | In the standard approach to studying wormhole geometry, the presence of dark energy is unavoidable to ensure traversability. The dark energy provides the negative gravity effect to keep the throat open. The question we analyse is whether the same can be achieved without dark energy. It turns out that if we couple the t... |
gr-qc/9505041 | James H. Horne | Douglas M. Eardley, Eric W. Hirschmann, James H. Horne | S-Duality at the Black Hole Threshold in Gravitational Collapse | 8 pages of LaTeX, uses style "revtex"; 1 figure, available in
archive, or at ftp://ftp.itp.ucsb.edu/figures/nsf-itp-95-15.eps | Phys.Rev.D52:5397-5401,1995 | 10.1103/PhysRevD.52.R5397 | NSF-ITP-95-15 DAMTP-R95/27 | gr-qc hep-th | null | We study gravitational collapse of the axion/dilaton field in classical low
energy string theory, at the threshold for black hole formation. A new critical
solution is derived that is spherically symmetric and continuously
self-similar. The universal scaling and echoing behavior discovered by Choptuik
in gravitationa... | [
{
"created": "Mon, 22 May 1995 18:17:38 GMT",
"version": "v1"
}
] | 2010-01-06 | [
[
"Eardley",
"Douglas M.",
""
],
[
"Hirschmann",
"Eric W.",
""
],
[
"Horne",
"James H.",
""
]
] | We study gravitational collapse of the axion/dilaton field in classical low energy string theory, at the threshold for black hole formation. A new critical solution is derived that is spherically symmetric and continuously self-similar. The universal scaling and echoing behavior discovered by Choptuik in gravitational ... |
0907.3816 | Mustapha Azreg-A\"inou | M Azreg-A\"inou | Comment on `The Newtonian force experienced by a point mass near a
finite cylindrical source' | 2 pages, LaTeX | Class.Quant.Grav.26:158001,2009 | 10.1088/0264-9381/26/15/158001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare the computation times and precisions of three expansions for the
gravitational potential. The evaluation of the series by Selvaggi et al (2008
\textit{Class. Quantum Grav.} \textbf{25} 015013) is time-consuming to be
applied to the gravitational constant ($G$) or STEP experiments.
| [
{
"created": "Wed, 22 Jul 2009 11:20:01 GMT",
"version": "v1"
}
] | 2009-10-02 | [
[
"Azreg-Aïnou",
"M",
""
]
] | We compare the computation times and precisions of three expansions for the gravitational potential. The evaluation of the series by Selvaggi et al (2008 \textit{Class. Quantum Grav.} \textbf{25} 015013) is time-consuming to be applied to the gravitational constant ($G$) or STEP experiments. |
1603.00112 | Ichiro Oda | Ichiro Oda | Topological Induced Gravity | 16 pages. arXiv admin note: text overlap with arXiv:1602.03478 | null | 10.1142/S0218271817500237 | DPUR/TH/48 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a topological model of induced gravity (pregeometry) where both
Newton's coupling constant and the cosmological constant appear as integration
constants in solving field equations. The matter sector of a scalar field is
also considered, and by solving field equations it is shown that various types
of cosmo... | [
{
"created": "Tue, 1 Mar 2016 02:00:08 GMT",
"version": "v1"
}
] | 2017-02-15 | [
[
"Oda",
"Ichiro",
""
]
] | We propose a topological model of induced gravity (pregeometry) where both Newton's coupling constant and the cosmological constant appear as integration constants in solving field equations. The matter sector of a scalar field is also considered, and by solving field equations it is shown that various types of cosmolo... |
gr-qc/0207051 | Marcelo S. Berman | Marcelo Samuel Berman and Luis A. Trevisan | Inflationary Lambda-Universe with Time Varying Fundamental Constants | 8 pages including front cover | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Barrow, and Barrow and collaborators, have put forward theoretical models
with variable fundamental constants including JBD theories. The experimental
evidence for an accelerating Universe points out to a deceleration parameter
approximately equal to -- 1. On the other hand, there is evidence for a time
varying fine ... | [
{
"created": "Fri, 12 Jul 2002 14:54:57 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jul 2002 20:42:22 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Jul 2009 23:58:08 GMT",
"version": "v3"
},
{
"created": "Mon, 27 Jul 2009 23:17:48 GMT",
"version": "v4"
},
{
"c... | 2009-09-23 | [
[
"Berman",
"Marcelo Samuel",
""
],
[
"Trevisan",
"Luis A.",
""
]
] | Barrow, and Barrow and collaborators, have put forward theoretical models with variable fundamental constants including JBD theories. The experimental evidence for an accelerating Universe points out to a deceleration parameter approximately equal to -- 1. On the other hand, there is evidence for a time varying fine st... |
1108.4519 | Kourosh Nozari | Kourosh Nozari and Faeze Kiani | On the cosmological viability of the Hu-Sawicki type modified induced
gravity | 17 pages, 2 figures, accepted for publication in Phys. Lett. B | Phys.Lett.B703:395-401,2011 | 10.1016/j.physletb.2011.08.020 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown recently that the normal branch of a DGP braneworld
scenario self-accelerates if the induced gravity on the brane is modified in
the spirit of $f(R)$ modified gravity. Within this viewpoint, we investigate
cosmological viability of the Hu-Sawicki type modified induced gravity.
Firstly, we present a ... | [
{
"created": "Tue, 23 Aug 2011 07:55:09 GMT",
"version": "v1"
}
] | 2011-09-27 | [
[
"Nozari",
"Kourosh",
""
],
[
"Kiani",
"Faeze",
""
]
] | It has been shown recently that the normal branch of a DGP braneworld scenario self-accelerates if the induced gravity on the brane is modified in the spirit of $f(R)$ modified gravity. Within this viewpoint, we investigate cosmological viability of the Hu-Sawicki type modified induced gravity. Firstly, we present a dy... |
2312.03811 | Matthew J. Lake Dr | Matthew J. Lake and Marek Miller | Quantum reference frames, revisited | 95 pages, including 13 pages of references. 13 figures. Comments
welcome | null | null | null | gr-qc hep-ph quant-ph | http://creativecommons.org/licenses/by/4.0/ | The topic of quantum reference frames (QRFs) has attracted a great deal of
attention in the recent literature. Potentially, the correct description of
such frames is important for both the technological applications of quantum
mechanics and for its foundations, including the search for a future theory of
quantum grav... | [
{
"created": "Wed, 6 Dec 2023 18:15:52 GMT",
"version": "v1"
}
] | 2023-12-08 | [
[
"Lake",
"Matthew J.",
""
],
[
"Miller",
"Marek",
""
]
] | The topic of quantum reference frames (QRFs) has attracted a great deal of attention in the recent literature. Potentially, the correct description of such frames is important for both the technological applications of quantum mechanics and for its foundations, including the search for a future theory of quantum gravit... |
gr-qc/0012001 | Spiros Cotsakis | Spiros Cotsakis and John Miritzis | Algebraic integrability of FRW-scalar cosmologies | Research announcement, 2 pages, submitted for publication in the MG9
Proceedings | null | null | null | gr-qc | null | For dynamical systems of dimension three or more the question of
integrability or nonintegrability is extended by the possibility of chaotic
behaviour in the general solution. We determine the integrability of isotropic
cosmological models in general relativity and string theory with a variety of
matter terms, by a p... | [
{
"created": "Fri, 1 Dec 2000 11:29:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cotsakis",
"Spiros",
""
],
[
"Miritzis",
"John",
""
]
] | For dynamical systems of dimension three or more the question of integrability or nonintegrability is extended by the possibility of chaotic behaviour in the general solution. We determine the integrability of isotropic cosmological models in general relativity and string theory with a variety of matter terms, by a per... |
gr-qc/0702056 | Calvin Smith | Christopher J. Fewster and Calvin J. Smith | Absolute quantum energy inequalities in curved spacetime | 31 pages. Corrections and clarifications added. Final version to
appear in Ann. H. Poincare | AnnalesHenriPoincare9:425-455,2008 | 10.1007/s00023-008-0361-0 | null | gr-qc | null | Quantum Energy Inequalities (QEIs) are results which limit the extent to
which the smeared renormalised energy density of the quantum field can be
negative, when averaged along a timelike curve or over a more general timelike
submanifold in spacetime. On globally hyperbolic spacetimes the
minimally-coupled massive qu... | [
{
"created": "Fri, 9 Feb 2007 12:43:33 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Feb 2007 17:00:01 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Dec 2007 09:42:54 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Fewster",
"Christopher J.",
""
],
[
"Smith",
"Calvin J.",
""
]
] | Quantum Energy Inequalities (QEIs) are results which limit the extent to which the smeared renormalised energy density of the quantum field can be negative, when averaged along a timelike curve or over a more general timelike submanifold in spacetime. On globally hyperbolic spacetimes the minimally-coupled massive quan... |
2209.14484 | Stephen Adler | Stephen L. Adler | Equation of state, and atomic electron effective potential, for a Weyl
scaling invariant dark energy | 10 pages. Sec. I Introduction expanded. Sec. II on w and the figures
are new. Secs. III and IV are the original 2208.14484 with minor edits. This
posting will be submitted for publication | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A key attribute of dark energy is the equation of state parameter $w={\rm
pressure}/{\rm energy~density}$, and this has been recently measured
observationally, giving values close to $-1$. In this paper we calculate the
$w$ parameter characterizing the novel Weyl scaling invariant dark energy that
we have analyzed in... | [
{
"created": "Thu, 29 Sep 2022 00:30:11 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Feb 2024 20:02:40 GMT",
"version": "v2"
},
{
"created": "Sat, 15 Jun 2024 02:40:30 GMT",
"version": "v3"
}
] | 2024-06-18 | [
[
"Adler",
"Stephen L.",
""
]
] | A key attribute of dark energy is the equation of state parameter $w={\rm pressure}/{\rm energy~density}$, and this has been recently measured observationally, giving values close to $-1$. In this paper we calculate the $w$ parameter characterizing the novel Weyl scaling invariant dark energy that we have analyzed in a... |
1802.09073 | Mariafelicia De Laurentis Professor | Mariafelicia De Laurentis | Noether's stars in $f(\cal {R})$ gravity | 7 pages, 4 figures, accepted for publication in Physics Letter B | null | 10.1016/j.physletb.2018.03.001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Noether Symmetry Approach can be used to construct spherically symmetric
solutions in $f({\cal R})$ gravity. Specifically, the Noether conserved
quantity is related to the gravitational mass and a gravitational radius that
reduces to the Schwarzschild radius in the limit $f({\cal R})\rightarrow {\cal
R}$. We show... | [
{
"created": "Sun, 25 Feb 2018 20:37:07 GMT",
"version": "v1"
}
] | 2018-04-04 | [
[
"De Laurentis",
"Mariafelicia",
""
]
] | The Noether Symmetry Approach can be used to construct spherically symmetric solutions in $f({\cal R})$ gravity. Specifically, the Noether conserved quantity is related to the gravitational mass and a gravitational radius that reduces to the Schwarzschild radius in the limit $f({\cal R})\rightarrow {\cal R}$. We show t... |
gr-qc/9408033 | Jorma Louko | Jorma Louko | Chern-Simons functional and the no-boundary proposal in Bianchi IX
quantum cosmology | 9 pages, REVTeX v3.0. (One reference added.) | Phys.Rev.D51:586-590,1995 | 10.1103/PhysRevD.51.586 | WISC-MILW-94-TH-20 | gr-qc hep-th | null | The Chern-Simons functional $S_{\rm CS}$ is an exact solution to the
Ashtekar-Hamilton-Jacobi equation of general relativity with a nonzero
cosmological constant. In this paper we consider $S_{\rm CS}$ in Bianchi type
IX cosmology with $S^3$ spatial surfaces. We show that among the classical
solutions generated by~$S... | [
{
"created": "Fri, 26 Aug 1994 03:22:18 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Feb 1995 01:27:42 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Louko",
"Jorma",
""
]
] | The Chern-Simons functional $S_{\rm CS}$ is an exact solution to the Ashtekar-Hamilton-Jacobi equation of general relativity with a nonzero cosmological constant. In this paper we consider $S_{\rm CS}$ in Bianchi type IX cosmology with $S^3$ spatial surfaces. We show that among the classical solutions generated by~$S_{... |
gr-qc/0702133 | Yosef Zlochower | Manuela Campanelli, Carlos O. Lousto, Yosef Zlochower, David Merritt | Maximum gravitational recoil | 4 pages, 4 figs, revtex4 | Phys.Rev.Lett.98:231102,2007 | 10.1103/PhysRevLett.98.231102 | null | gr-qc astro-ph | null | Recent calculations of gravitational radiation recoil generated during
black-hole binary mergers have reopened the possibility that a merged binary
can be ejected even from the nucleus of a massive host galaxy. Here we report
the first systematic study of gravitational recoil of equal-mass binaries with
equal, but an... | [
{
"created": "Sun, 25 Feb 2007 20:48:58 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Feb 2007 23:52:41 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Campanelli",
"Manuela",
""
],
[
"Lousto",
"Carlos O.",
""
],
[
"Zlochower",
"Yosef",
""
],
[
"Merritt",
"David",
""
]
] | Recent calculations of gravitational radiation recoil generated during black-hole binary mergers have reopened the possibility that a merged binary can be ejected even from the nucleus of a massive host galaxy. Here we report the first systematic study of gravitational recoil of equal-mass binaries with equal, but anti... |
gr-qc/0402040 | Yuichirou Sekiguchi | Masaru Shibata and Yu-ichirou Sekiguchi | Gravitational waves from axisymmetric rotating stellar core collapse to
a neutron star in full general relativity | Phys. Rev. D in press | Phys.Rev.D69:084024,2004 | 10.1103/PhysRevD.69.084024 | null | gr-qc astro-ph | null | Axisymmetric numerical simulations of rotating stellar core collapse to a
neutron star are performed in the framework of full general relativity. The
so-called Cartoon method, in which the Einstein field equations are solved in
the Cartesian coordinates and the axisymmetric condition is imposed around the
$y=0$ plane... | [
{
"created": "Sun, 8 Feb 2004 12:23:13 GMT",
"version": "v1"
}
] | 2011-07-18 | [
[
"Shibata",
"Masaru",
""
],
[
"Sekiguchi",
"Yu-ichirou",
""
]
] | Axisymmetric numerical simulations of rotating stellar core collapse to a neutron star are performed in the framework of full general relativity. The so-called Cartoon method, in which the Einstein field equations are solved in the Cartesian coordinates and the axisymmetric condition is imposed around the $y=0$ plane, ... |
2311.03315 | Indranil Chakraborty | Soumya Bhattacharya, Debanjan Bose, Indranil Chakraborty, Arpan Hait,
and Subhendra Mohanty | Gravitational memory signal from neutrino self-interactions in supernova | 12 pages, 3 figures, comments are welcome | null | null | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Neutrinos with large self-interactions, arising from exchange of light
scalars or vectors with mass $M_\phi\simeq 10{\rm MeV}$, can play a useful role
in cosmology for structure formation and solving the Hubble tension. It has
been proposed that large self-interactions of neutrinos may change the observed
properties ... | [
{
"created": "Mon, 6 Nov 2023 18:08:19 GMT",
"version": "v1"
}
] | 2023-11-07 | [
[
"Bhattacharya",
"Soumya",
""
],
[
"Bose",
"Debanjan",
""
],
[
"Chakraborty",
"Indranil",
""
],
[
"Hait",
"Arpan",
""
],
[
"Mohanty",
"Subhendra",
""
]
] | Neutrinos with large self-interactions, arising from exchange of light scalars or vectors with mass $M_\phi\simeq 10{\rm MeV}$, can play a useful role in cosmology for structure formation and solving the Hubble tension. It has been proposed that large self-interactions of neutrinos may change the observed properties of... |
2210.09254 | Jamie Bamber | Jamie Bamber, Josu C. Aurrekoetxea, Katy Clough, Pedro G. Ferreira | Black hole merger simulations in wave dark matter environments | 9 pages, 5 figures, 1 appendix, 2 movies:
https://youtube.com/playlist?list=PLSkfizpQDrcb8Zd7C9yEfnMpnKQk7I9ts Comments
welcome! | null | 10.1103/PhysRevD.107.024035 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | The interaction of binary black hole mergers with their environments can be
studied using numerical relativity simulations. These start only a short finite
time before merger, at which point appropriate initial conditions must be
imposed. A key task is therefore to identify the configuration that is
appropriate for t... | [
{
"created": "Mon, 17 Oct 2022 16:51:13 GMT",
"version": "v1"
}
] | 2023-02-08 | [
[
"Bamber",
"Jamie",
""
],
[
"Aurrekoetxea",
"Josu C.",
""
],
[
"Clough",
"Katy",
""
],
[
"Ferreira",
"Pedro G.",
""
]
] | The interaction of binary black hole mergers with their environments can be studied using numerical relativity simulations. These start only a short finite time before merger, at which point appropriate initial conditions must be imposed. A key task is therefore to identify the configuration that is appropriate for the... |
gr-qc/0501106 | Victor Varela | V. Varela | Neutral perfect fluids of Majumdar-type in general relativity | 9 pages | Gen.Rel.Grav. 37 (2005) 1769-1777 | 10.1007/s10714-005-0157-1 | null | gr-qc | null | We consider the extension of the Majumdar-type class of static solutions for
the Einstein-Maxwell equations, proposed by Ida to include charged perfect
fluid sources. We impose the equation of state $\rho+3p=0$ and discuss
spherically symmetric solutions for the linear potential equation satisfied by
the metric. In t... | [
{
"created": "Mon, 31 Jan 2005 20:07:44 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Varela",
"V.",
""
]
] | We consider the extension of the Majumdar-type class of static solutions for the Einstein-Maxwell equations, proposed by Ida to include charged perfect fluid sources. We impose the equation of state $\rho+3p=0$ and discuss spherically symmetric solutions for the linear potential equation satisfied by the metric. In thi... |
2112.02654 | Pierre-Henri Chavanis | Pierre-Henri Chavanis | The self-gravitating Fermi gas in Newtonian gravity and general
relativity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the history of the self-gravitating Fermi gas in Newtonian gravity
and general relativity. We mention applications to white dwarfs, neutron stars
and dark matter halos. We describe the nature of instabilities and phase
transitions in the self-gravitating Fermi gas as energy (microcanonical
ensemble) or temp... | [
{
"created": "Sun, 5 Dec 2021 19:05:04 GMT",
"version": "v1"
}
] | 2021-12-07 | [
[
"Chavanis",
"Pierre-Henri",
""
]
] | We review the history of the self-gravitating Fermi gas in Newtonian gravity and general relativity. We mention applications to white dwarfs, neutron stars and dark matter halos. We describe the nature of instabilities and phase transitions in the self-gravitating Fermi gas as energy (microcanonical ensemble) or temper... |
1606.08183 | Li-E Qiang | Li-E Qiang | Secular Gravity Gradients in Non-Dynamical Chern-Simons Modified Gravity
for Satellite Gradiometry Measurements | 11 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With continuous advances in related technologies, relativistic gravitational
experiments with orbiting gradiometers becomes feasible, which could naturally
be incorporated into future satellite gravity missions. Tests of Chern-Simons
modified gravity are meaningful since such a modification gives us insights
into (po... | [
{
"created": "Mon, 27 Jun 2016 09:59:44 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Jun 2016 03:46:58 GMT",
"version": "v2"
}
] | 2016-06-30 | [
[
"Qiang",
"Li-E",
""
]
] | With continuous advances in related technologies, relativistic gravitational experiments with orbiting gradiometers becomes feasible, which could naturally be incorporated into future satellite gravity missions. Tests of Chern-Simons modified gravity are meaningful since such a modification gives us insights into (poss... |
0709.1400 | Orchidea Maria Lecian | O. M. Lecian, G. Montani | Dark Energy as a Relic of the Vacuum-Energy Cancellation? | 24 pages, 2 figures, to appear on IJMPD | Int.J.Mod.Phys.D17:111-133,2008 | 10.1142/S0218271808011900 | null | gr-qc | null | We analyze the dynamical implications of an exponential Lagrangian density
for the gravitational field, as referred to an isotropic FRW Universe. Then, we
discuss the features of the generalized deSitter phase, predicted by the new
Friedmann equation. The existence of a consistent deSitter solution arises only
if the... | [
{
"created": "Mon, 10 Sep 2007 14:01:45 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lecian",
"O. M.",
""
],
[
"Montani",
"G.",
""
]
] | We analyze the dynamical implications of an exponential Lagrangian density for the gravitational field, as referred to an isotropic FRW Universe. Then, we discuss the features of the generalized deSitter phase, predicted by the new Friedmann equation. The existence of a consistent deSitter solution arises only if the r... |
1306.0374 | Domenico Giulini J.W. | Domenico Giulini | Does cosmological expansion affect local physics? | 39 pages, 6 figures. Based on a talk delivered at the conference on
"Philosophical Aspects of Modern Cosmology", held in Granada, 22-23 September
2011. In version 2 references were added and updated. Also, a new final
subsection on "black-hole cosmology" was added | Studies in History and Philosophy of Modern Physics Volume 46,
Part A, May 2014, Pages 24-37 | 10.1016/j.shpsb.2013.09.009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution I wish to address the question whether, and how, the
global cosmological expansion influences local physics. I argue that a pseudo
Newtonian picture can be quite accurate if "expansion" is taken to be an
attribute of the inertial structure rather than of "space" in some
substantivalist sense. Thi... | [
{
"created": "Mon, 3 Jun 2013 12:11:27 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Oct 2013 13:00:23 GMT",
"version": "v2"
}
] | 2014-09-10 | [
[
"Giulini",
"Domenico",
""
]
] | In this contribution I wish to address the question whether, and how, the global cosmological expansion influences local physics. I argue that a pseudo Newtonian picture can be quite accurate if "expansion" is taken to be an attribute of the inertial structure rather than of "space" in some substantivalist sense. This ... |
0907.4146 | Theodore A. Jacobson | Ted Jacobson and Thomas P. Sotiriou | Over-spinning a black hole with a test body | 4 pages; v2: reference added, incorporates the missed case of an
oblate test body, which appears with the published version only as an
erratum, other minor edits (with respect to v1) | Phys. Rev. Lett. 103, 141101 (2009); 103, 209903(E) (2009) | 10.1103/PhysRevLett.103.141101 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has long been known that a maximally spinning black hole can not be
over-spun by tossing in a test body. Here we show that if instead the black
hole starts out with below maximal spin, then indeed over-spinning can be
achieved when adding either orbital or spin angular momentum. We find that
requirements on the si... | [
{
"created": "Thu, 23 Jul 2009 19:56:39 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Dec 2009 22:58:20 GMT",
"version": "v2"
}
] | 2009-12-02 | [
[
"Jacobson",
"Ted",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | It has long been known that a maximally spinning black hole can not be over-spun by tossing in a test body. Here we show that if instead the black hole starts out with below maximal spin, then indeed over-spinning can be achieved when adding either orbital or spin angular momentum. We find that requirements on the size... |
gr-qc/9610050 | null | Cristian Martinez, Jorge Zanelli | Back-reaction of a conformal field on a three-dimensional black hole | 12 pages, RevTeX, no figures | Phys.Rev. D55 (1997) 3642-3646 | 10.1103/PhysRevD.55.3642 | null | gr-qc | null | The first order corrections to the geometry of the (2+1)-dimensional black
hole due to back-reaction of a massless conformal scalar field are computed.
The renormalized stress energy tensor used as the source of Einstein equations
is computed with the Green function for the black-hole background with
transparent boun... | [
{
"created": "Tue, 22 Oct 1996 22:12:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Martinez",
"Cristian",
""
],
[
"Zanelli",
"Jorge",
""
]
] | The first order corrections to the geometry of the (2+1)-dimensional black hole due to back-reaction of a massless conformal scalar field are computed. The renormalized stress energy tensor used as the source of Einstein equations is computed with the Green function for the black-hole background with transparent bounda... |
gr-qc/0205070 | Victor Hugo Cardenas | Victor H. Cardenas | Protecting the Holographic Principle: Inflation | 10 pages, 2 figures. To appear in Physics Letter B | null | null | UCV-IF 02/03 | gr-qc astro-ph | null | A scenario where inflation emerges as a response to protect the holographic
principle is described. A two fluid model in a closed universe inflation
picture is assumed, and a possible explanation for secondary exponential
expansion phases as those currently observed is given.
| [
{
"created": "Thu, 16 May 2002 13:32:17 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Apr 2003 19:17:13 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Cardenas",
"Victor H.",
""
]
] | A scenario where inflation emerges as a response to protect the holographic principle is described. A two fluid model in a closed universe inflation picture is assumed, and a possible explanation for secondary exponential expansion phases as those currently observed is given. |
gr-qc/9608022 | Hideo Kodama | Hideo Kodama(Yukawa Institute) and Takashi Hamazaki(Dept. of Phys.,
Kyoto University) | Evolution of cosmological perturbations in a stage dominated by an
oscillatory scalar field | Revised version, 23 pages, no figure, plain LaTeX, minor errors in
some equations are corrected, no change in the main results and the
conclusion | Prog.Theor.Phys. 96 (1996) 949-970 | 10.1143/PTP.96.949 | YITP-96-28, KUNS 1406 | gr-qc | null | In the investigation of the evolution of cosmological perturbations in
inflationary universe models the behavior of perturbations during the reheating
stage is the most unclear point. In particular in the early reheating phase in
which a rapidly oscillating scalar field dominates the energy density, the
behavior of p... | [
{
"created": "Fri, 9 Aug 1996 07:56:40 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Sep 1996 07:11:49 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Kodama",
"Hideo",
"",
"Yukawa Institute"
],
[
"Hamazaki",
"Takashi",
"",
"Dept. of Phys.,\n Kyoto University"
]
] | In the investigation of the evolution of cosmological perturbations in inflationary universe models the behavior of perturbations during the reheating stage is the most unclear point. In particular in the early reheating phase in which a rapidly oscillating scalar field dominates the energy density, the behavior of per... |
2007.00026 | Ufuk Aydemir | Ufuk Aydemir | Primordial Black-Hole Mimicker in Quadratic Gravity as Dark Matter | 24 pages, 3 figures. Invited talk at Corfu Summer Institute 2019
"School and Workshops on Elementary Particle Physics and Gravity"
(CORFU2019), 31 August - 25 September 2019, Corfu, Greece. Based mainly on
arXiv:2003.10682; slightly different presentation and some complementary
remarks | null | null | null | gr-qc astro-ph.CO astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the astrophysical and cosmological implications of having
primordial thermal 2-2-hole remnants as dark matter. Thermal 2-2-holes emanate
in quadratic gravity as horizonless classical solutions for ultracompact
distributions of relativistic thermal gas. In contrast to a large 2-2-hole that
imitates the ther... | [
{
"created": "Tue, 30 Jun 2020 18:01:15 GMT",
"version": "v1"
}
] | 2020-07-02 | [
[
"Aydemir",
"Ufuk",
""
]
] | We discuss the astrophysical and cosmological implications of having primordial thermal 2-2-hole remnants as dark matter. Thermal 2-2-holes emanate in quadratic gravity as horizonless classical solutions for ultracompact distributions of relativistic thermal gas. In contrast to a large 2-2-hole that imitates the thermo... |
1312.2279 | Viktor G. Czinner | Viktor G. Czinner | Thick Dirac-Nambu-Goto branes on black hole backgrounds | 4 pages, 2 figures, Proceedings of the Spanish Relativity Meeting in
Portugal ERE2012 | Progress in Mathematical Relativity, Gravitation and Cosmology,
Springer Proceedings in Mathematics & Statistics Volume 60, 2014, pp 223-226 | 10.1007/978-3-642-40157-2_28 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thickness corrections to static, axisymmetric Dirac-Nambu-Goto branes
embedded into spherically symmetric black hole spacetimes with arbitrary number
of dimensions are studied. First, by applying a perturbative approximation, it
is found that the thick solutions deviate significantly in their analytic
properties from... | [
{
"created": "Sun, 8 Dec 2013 23:26:01 GMT",
"version": "v1"
}
] | 2013-12-13 | [
[
"Czinner",
"Viktor G.",
""
]
] | Thickness corrections to static, axisymmetric Dirac-Nambu-Goto branes embedded into spherically symmetric black hole spacetimes with arbitrary number of dimensions are studied. First, by applying a perturbative approximation, it is found that the thick solutions deviate significantly in their analytic properties from t... |
gr-qc/9812024 | Don Marolf | Domenico Giulini and Donald Marolf | On the Generality of Refined Algebraic Quantization | 12 pages, no figures, ReVTeX, some changes in presentation, some
references added | Class.Quant.Grav.16:2479-2488,1999 | 10.1088/0264-9381/16/7/321 | ZU-TH-98/20 | gr-qc | null | The Dirac quantization `procedure' for constrained systems is well known to
have many subtleties and ambiguities. Within this ill-defined framework, we
explore the generality of a particular interpretation of the Dirac procedure
known as refined algebraic quantization. We find technical conditions under
which refined... | [
{
"created": "Mon, 7 Dec 1998 14:17:44 GMT",
"version": "v1"
},
{
"created": "Mon, 31 May 1999 20:13:22 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Giulini",
"Domenico",
""
],
[
"Marolf",
"Donald",
""
]
] | The Dirac quantization `procedure' for constrained systems is well known to have many subtleties and ambiguities. Within this ill-defined framework, we explore the generality of a particular interpretation of the Dirac procedure known as refined algebraic quantization. We find technical conditions under which refined a... |
2302.00229 | Zu-Cheng Chen | Yu-Mei Wu, Zu-Cheng Chen, Qing-Guo Huang | Search for Stochastic Gravitational-Wave Background from Massive Gravity
in the NANOGrav 12.5-Year Data Set | 7 pages, 2 figures, 1 table; accepted for publication in Phys. Rev. D | null | 10.1103/PhysRevD.107.042003 | null | gr-qc astro-ph.CO astro-ph.GA astro-ph.HE hep-ph | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves offer a new window to probe the nature of gravity,
including answering if the mediating particle, graviton, has a non-zero mass or
not. Pulsar timing arrays measure stochastic gravitational wave background
(SGWB) at $\sim1-100$~nanohertz. Recently, the North American Nanohertz
Observatory for Grav... | [
{
"created": "Wed, 1 Feb 2023 04:19:54 GMT",
"version": "v1"
}
] | 2023-03-01 | [
[
"Wu",
"Yu-Mei",
""
],
[
"Chen",
"Zu-Cheng",
""
],
[
"Huang",
"Qing-Guo",
""
]
] | Gravitational waves offer a new window to probe the nature of gravity, including answering if the mediating particle, graviton, has a non-zero mass or not. Pulsar timing arrays measure stochastic gravitational wave background (SGWB) at $\sim1-100$~nanohertz. Recently, the North American Nanohertz Observatory for Gravit... |
1306.5974 | P. A. Gonzalez | Ramon Becar, P. A. Gonzalez and Y. Vasquez | Dirac quasinormal modes of Chern-Simons and BTZ black holes with torsion | Version accepted for publication in PRD | Phys. Rev. D 89, 023001 (2014) | 10.1103/PhysRevD.89.023001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Chern-Simons black holes in d-dimensions and we calculate
analytically the quasinormal modes of fermionic perturbations. Also, we
consider as background the five-dimensional Chern-Simons black hole with
torsion and the BTZ black hole with torsion. We have found that the quasinormal
modes depend on the highes... | [
{
"created": "Tue, 25 Jun 2013 14:14:58 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Jul 2013 01:35:36 GMT",
"version": "v2"
},
{
"created": "Sun, 8 Dec 2013 15:01:32 GMT",
"version": "v3"
}
] | 2014-01-15 | [
[
"Becar",
"Ramon",
""
],
[
"Gonzalez",
"P. A.",
""
],
[
"Vasquez",
"Y.",
""
]
] | We study Chern-Simons black holes in d-dimensions and we calculate analytically the quasinormal modes of fermionic perturbations. Also, we consider as background the five-dimensional Chern-Simons black hole with torsion and the BTZ black hole with torsion. We have found that the quasinormal modes depend on the highest ... |
gr-qc/0309098 | Diego Pavon | German Izquierdo and Diego Pavon | Mini Black Holes and the Relic Gravitational Waves Spectrum | 19 pages, 2 figures. To be published in section D of the Physical
Review | Phys.Rev. D68 (2003) 124005 | 10.1103/PhysRevD.68.124005 | null | gr-qc astro-ph hep-ph | null | In this paper we explore the impact of an era -right after reheating-
dominated by mini black holes and radiation on the spectrum of the relic
gravitational waves. This era may lower the spectrum several orders of
magnitude.
| [
{
"created": "Fri, 19 Sep 2003 13:45:07 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Izquierdo",
"German",
""
],
[
"Pavon",
"Diego",
""
]
] | In this paper we explore the impact of an era -right after reheating- dominated by mini black holes and radiation on the spectrum of the relic gravitational waves. This era may lower the spectrum several orders of magnitude. |
gr-qc/9404038 | Hans-Juergen Schmidt | Hans - Juergen Schmidt | Stability and Hamiltonian formulation of higher derivative theories | 38 pages, LaTeX, no figures, Phys. Rev. D 49 (1994) 6354; the Erratum
Phys. Rev. D 54 (1996) 7906 clarifies that a spatially flat Friedmann model
need not be geodesically complete even if the scale factor a(t) is positive
and smooth for all real values of the synchronized time t | Phys.Rev.D49:6354,1994; Erratum-ibid.D54:7906,1996;
Phys.Rev.D54:7906,1996 | 10.1103/PhysRevD.49.6354 10.1103/PhysRevD.54.7906 | null | gr-qc | null | We analyze the presumptions which lead to instabilities in theories of order
higher than second. That type of fourth order gravity which leads to an
inflationary (quasi de Sitter) period of cosmic evolution by inclusion of one
curvature squared term (i.e. the Starobinsky model) is used as an example. The
correspondin... | [
{
"created": "Tue, 19 Apr 1994 16:30:25 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Mar 1997 13:51:02 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Schmidt",
"Hans - Juergen",
""
]
] | We analyze the presumptions which lead to instabilities in theories of order higher than second. That type of fourth order gravity which leads to an inflationary (quasi de Sitter) period of cosmic evolution by inclusion of one curvature squared term (i.e. the Starobinsky model) is used as an example. The corresponding ... |
gr-qc/0304031 | Huguet Eric | T. Garidi, E. Huguet, J. Renaud | De Sitter Waves and the Zero Curvature Limit | 9 pages, latex no figure, to appear in Phys. Rev. D | Phys.Rev. D67 (2003) 124028 | 10.1103/PhysRevD.67.124028 | null | gr-qc | null | We show that a particular set of global modes for the massive de Sitter
scalar field (the de Sitter waves) allows to manage the group representations
and the Fourier transform in the flat (Minkowskian) limit. This is in
opposition to the usual acceptance based on a previous result, suggesting the
appearance of negati... | [
{
"created": "Mon, 7 Apr 2003 10:51:08 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Garidi",
"T.",
""
],
[
"Huguet",
"E.",
""
],
[
"Renaud",
"J.",
""
]
] | We show that a particular set of global modes for the massive de Sitter scalar field (the de Sitter waves) allows to manage the group representations and the Fourier transform in the flat (Minkowskian) limit. This is in opposition to the usual acceptance based on a previous result, suggesting the appearance of negative... |
2010.07059 | Marc Geiller | Marc Geiller, Etera R. Livine, Francesco Sartini | Symmetries of the Black Hole Interior and Singularity Regularization | 46 pages, 6 figures | SciPost Phys. 10, 022 (2021) | 10.21468/SciPostPhys.10.1.022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reveal an $\mathfrak{iso}(2,1)$ Poincar\'e algebra of conserved charges
associated with the dynamics of the interior of black holes. The action of
these Noether charges integrates to a symmetry of the gravitational system
under the Poincar\'e group ISO$(2,1)$, which allows to describe the evolution
of the geometry... | [
{
"created": "Wed, 14 Oct 2020 13:07:14 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Jan 2021 13:56:04 GMT",
"version": "v2"
}
] | 2021-02-01 | [
[
"Geiller",
"Marc",
""
],
[
"Livine",
"Etera R.",
""
],
[
"Sartini",
"Francesco",
""
]
] | We reveal an $\mathfrak{iso}(2,1)$ Poincar\'e algebra of conserved charges associated with the dynamics of the interior of black holes. The action of these Noether charges integrates to a symmetry of the gravitational system under the Poincar\'e group ISO$(2,1)$, which allows to describe the evolution of the geometry i... |
gr-qc/0703038 | Sigbjorn Hervik | S Hervik, R J van den Hoogen, W C Lim and A A Coley | Late-time behaviour of the tilted Bianchi type VIh models | 35 pages, 14 figures; v2:added more comments and refs, typos
corrected | Class.Quant.Grav.24:3859-3896,2007 | 10.1088/0264-9381/24/15/007 | null | gr-qc astro-ph hep-th | null | We study tilted perfect fluid cosmological models with a constant equation of
state parameter in spatially homogeneous models of Bianchi type VI_h using
dynamical systems methods and numerical experimentation, with an emphasis on
their future asymptotic evolution. We determine all of the equilibrium points
of the typ... | [
{
"created": "Tue, 6 Mar 2007 13:55:33 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jul 2007 14:04:49 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hervik",
"S",
""
],
[
"Hoogen",
"R J van den",
""
],
[
"Lim",
"W C",
""
],
[
"Coley",
"A A",
""
]
] | We study tilted perfect fluid cosmological models with a constant equation of state parameter in spatially homogeneous models of Bianchi type VI_h using dynamical systems methods and numerical experimentation, with an emphasis on their future asymptotic evolution. We determine all of the equilibrium points of the type ... |
1004.1973 | Arturo Stabile | A. Stabile | The Post-Newtonian Limit of f(R)-gravity in the Harmonic Gauge | 16 pages, 10 figures | Phys.Rev.D82:064021,2010 | 10.1103/PhysRevD.82.064021 | null | gr-qc astro-ph.EP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general analytic procedure is developed for the post-Newtonian limit of
$f(R)$-gravity with metric approach in the Jordan frame by using the harmonic
gauge condition. In a pure perturbative framework and by using the Green
function method a general scheme of solutions up to $(v/c)^4$ order is shown.
Considering the... | [
{
"created": "Mon, 12 Apr 2010 14:34:20 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jun 2010 20:16:12 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Stabile",
"A.",
""
]
] | A general analytic procedure is developed for the post-Newtonian limit of $f(R)$-gravity with metric approach in the Jordan frame by using the harmonic gauge condition. In a pure perturbative framework and by using the Green function method a general scheme of solutions up to $(v/c)^4$ order is shown. Considering the T... |
gr-qc/0606100 | Xiao-Gang Wen | Zheng-Cheng Gu and Xiao-Gang Wen | A lattice bosonic model as a quantum theory of gravity | 4 pages. RevTeX4. Homepage http://dao.mit.edu/~wen | null | null | null | gr-qc cond-mat.str-el hep-th | null | A local quantum bosonic model on a lattice is constructed whose low energy
excitations are gravitons described by linearized Einstein action. Thus the
bosonic model is a quantum theory of gravity, at least at the linear level. We
find that the compactification and the discretization of metric tenor are
crucial in obt... | [
{
"created": "Fri, 23 Jun 2006 00:15:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gu",
"Zheng-Cheng",
""
],
[
"Wen",
"Xiao-Gang",
""
]
] | A local quantum bosonic model on a lattice is constructed whose low energy excitations are gravitons described by linearized Einstein action. Thus the bosonic model is a quantum theory of gravity, at least at the linear level. We find that the compactification and the discretization of metric tenor are crucial in obtai... |
1508.01402 | Raul Vera | Borja Reina and Ra\"ul Vera | On the mass of rotating stars in Newtonian gravity and GR | 11 pages, uses iopart style and a custom bibtex style | null | 10.1088/0264-9381/33/1/017001 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how the correction to the calculation of the mass in the original
relativistic model of a rotating star by Hartle [6], found recently [10],
appears in the Newtonian limit, and that the correcting term is indeed present,
albeit hidden, in the original Newtonian approach by Chandrasekhar [2].
| [
{
"created": "Thu, 6 Aug 2015 13:55:12 GMT",
"version": "v1"
}
] | 2015-12-16 | [
[
"Reina",
"Borja",
""
],
[
"Vera",
"Raül",
""
]
] | We show how the correction to the calculation of the mass in the original relativistic model of a rotating star by Hartle [6], found recently [10], appears in the Newtonian limit, and that the correcting term is indeed present, albeit hidden, in the original Newtonian approach by Chandrasekhar [2]. |
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