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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/9801087 | Jonathan Thornburg | Jonathan Thornburg | A 3+1 Computational Scheme for Dynamic Spherically Symmetric Black Hole
Spacetimes -- I: Initial Data | [revised to correct error in integrated-scalar-field mass function
defn, changed title and author address, assorted lesser changes] REVTeX, 45
pages, 25 figures + 1 rotated table, uses rotate.sty and natbib.sty
(included), to appear in PRD15 | Phys.Rev.D59:104007,1999 | 10.1103/PhysRevD.59.104007 | null | gr-qc | null | When using the black hole exclusion (horizon boundary condition) technique,
$K$ is usually nonzero and spatially variable, so none of the special cases of
York's conformal-decomposition algorithm apply, and the full 4-vector nonlinear
York equations must be solved numerically.
We discuss the construction of dynamic... | [
{
"created": "Tue, 27 Jan 1998 01:49:41 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jul 1998 01:20:09 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Thornburg",
"Jonathan",
""
]
] | When using the black hole exclusion (horizon boundary condition) technique, $K$ is usually nonzero and spatially variable, so none of the special cases of York's conformal-decomposition algorithm apply, and the full 4-vector nonlinear York equations must be solved numerically. We discuss the construction of dynamic bla... |
gr-qc/0011109 | Joan Centrella | Joan M. Centrella | Calculating Gravitational Radiation from Collisions | 9 pages; to be published in the proceedings of the Conference on
Stellar Collisions (American Museum of Natural History, June 2000), ed. M.
Shara, ASP Conference Series | null | null | null | gr-qc astro-ph | null | The development of both ground- and space-based gravitational wave detectors
provides new opportunities to observe the radiation from binaries containing
neutron stars and black holes. Numerical simulations in 3-D are essential for
calculating the coalescence waveforms, and comprise some of the most
challenging probl... | [
{
"created": "Wed, 29 Nov 2000 18:41:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Centrella",
"Joan M.",
""
]
] | The development of both ground- and space-based gravitational wave detectors provides new opportunities to observe the radiation from binaries containing neutron stars and black holes. Numerical simulations in 3-D are essential for calculating the coalescence waveforms, and comprise some of the most challenging problem... |
gr-qc/0601124 | Olivier Sarbach | Gabriel Nagy and Olivier Sarbach | A minimization problem for the lapse and the initial-boundary value
problem for Einstein's field equations | 34 pages, no figures | Class.Quant.Grav. 23 (2006) S477-S504 | 10.1088/0264-9381/23/16/S11 | null | gr-qc | null | We discuss the initial-boundary value problem of General Relativity. Previous
considerations for a toy model problem in electrodynamics motivate the
introduction of a variational principle for the lapse with several attractive
properties. In particular, it is argued that the resulting elliptic gauge
condition for the... | [
{
"created": "Sat, 28 Jan 2006 01:02:39 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Nagy",
"Gabriel",
""
],
[
"Sarbach",
"Olivier",
""
]
] | We discuss the initial-boundary value problem of General Relativity. Previous considerations for a toy model problem in electrodynamics motivate the introduction of a variational principle for the lapse with several attractive properties. In particular, it is argued that the resulting elliptic gauge condition for the l... |
1501.00427 | Davood Momeni Dr | G. Abbas, D. Momeni, M. Aamir Ali, R. Myrzakulov, S. Qaisar | Anisotropic Compact Stars in $f(G)$ Gravity | Version accepted in "Astrophysics and Space Science" | Astrophys.Space Sci. 357 (2015) 2, 158 | 10.1007/s10509-015-2392-6 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to study the possibility of forming anisotropic compact
stars in modified Gauss-Bonnet, namely called as $f(G)$ theory of gravity which
is one of the strong candidates,responsible for the accelerated expansion of
the universe. For this purpose, we have used analytical solution of Krori and
Barua... | [
{
"created": "Fri, 26 Dec 2014 04:21:48 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2015 07:33:05 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Abbas",
"G.",
""
],
[
"Momeni",
"D.",
""
],
[
"Ali",
"M. Aamir",
""
],
[
"Myrzakulov",
"R.",
""
],
[
"Qaisar",
"S.",
""
]
] | This paper is devoted to study the possibility of forming anisotropic compact stars in modified Gauss-Bonnet, namely called as $f(G)$ theory of gravity which is one of the strong candidates,responsible for the accelerated expansion of the universe. For this purpose, we have used analytical solution of Krori and Barua m... |
1509.02071 | David Hilditch | David Hilditch | Dual Foliation Formulations of General Relativity | 14 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A dual foliation treatment of General Relativity is presented. The basic idea
of the construction is to consider two foliations of a spacetime by spacelike
hypersurfaces and relate the two geometries. The treatment is expected to be
useful in various situations, and in particular whenever one would like to
compare ob... | [
{
"created": "Mon, 7 Sep 2015 15:01:45 GMT",
"version": "v1"
}
] | 2015-09-08 | [
[
"Hilditch",
"David",
""
]
] | A dual foliation treatment of General Relativity is presented. The basic idea of the construction is to consider two foliations of a spacetime by spacelike hypersurfaces and relate the two geometries. The treatment is expected to be useful in various situations, and in particular whenever one would like to compare obje... |
1911.09469 | Giuseppe Fanizza | Giuseppe Fanizza, Maurizio Gasperini, Giovanni Marozzi, Gabriele
Veneziano | Generalized covariant prescriptions for averaging cosmological
observables | 29 pages, 7 figures. Several comments added, comparison with previous
results improved, references added. Version accepted for publication on JCAP | JCAP 02 (2020) 017 | 10.1088/1475-7516/2020/02/017 | BA-TH/721-19, CERN-TH-2019-183 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present two new covariant and general prescriptions for averaging scalar
observables on spatial regions typical of the observed sources and intersecting
the past light-cone of a given observer. One of these prescriptions is adapted
to sources exactly located on a given space-like hypersurface, the other
applies in... | [
{
"created": "Thu, 21 Nov 2019 13:54:31 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jan 2020 17:04:44 GMT",
"version": "v2"
}
] | 2020-02-17 | [
[
"Fanizza",
"Giuseppe",
""
],
[
"Gasperini",
"Maurizio",
""
],
[
"Marozzi",
"Giovanni",
""
],
[
"Veneziano",
"Gabriele",
""
]
] | We present two new covariant and general prescriptions for averaging scalar observables on spatial regions typical of the observed sources and intersecting the past light-cone of a given observer. One of these prescriptions is adapted to sources exactly located on a given space-like hypersurface, the other applies inst... |
1111.5193 | Philipp Hoehn | Philipp A Hoehn, Emilia Kubalova, Artur Tsobanjan | Effective relational dynamics of a nonintegrable cosmological model | 32 pages, many figures, new title from published version (old title:
Effective relational dynamics of the closed FRW model universe minimally
coupled to a massive scalar field), new section 4.3.4 on generic breakdown of
relational evolution and other clarifications added. Matches published
version | Phys. Rev. D 86, 065014 (2012) | 10.1103/PhysRevD.86.065014 | ITP--UU--11/42; SPIN--11/33; IGC--11/11--1 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply the effective approach to evaluating semiclassical relational
dynamics to the closed Friedman--Robertson--Walker cosmological model filled
with a minimally coupled massive scalar field. This model is interesting for
studying relational dynamics in a more general setting because (i) it features
a nontrivial c... | [
{
"created": "Tue, 22 Nov 2011 13:27:46 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Nov 2012 23:08:20 GMT",
"version": "v2"
}
] | 2012-11-27 | [
[
"Hoehn",
"Philipp A",
""
],
[
"Kubalova",
"Emilia",
""
],
[
"Tsobanjan",
"Artur",
""
]
] | We apply the effective approach to evaluating semiclassical relational dynamics to the closed Friedman--Robertson--Walker cosmological model filled with a minimally coupled massive scalar field. This model is interesting for studying relational dynamics in a more general setting because (i) it features a nontrivial cou... |
gr-qc/0112035 | Sanjay M. Wagh | Sanjay M. Wagh and Keshlan S. Govinder | Spherically Symmetric, Self-Similar Spacetimes | Submitted to Physical Review Letters | Gen.Rel.Grav. 38 (2006) 1253-1259 | 10.1007/s10714-006-0305-2 | null | gr-qc | null | Self-similar spacetimes are of importance to cosmology and to gravitational
collapse problems. We show that self-similarity or the existence of a
homothetic Killing vector field for spherically symmetric spacetimes implies
the separability of the spacetime metric in terms of the co-moving coordinates
and that the met... | [
{
"created": "Sun, 16 Dec 2001 03:53:35 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Wagh",
"Sanjay M.",
""
],
[
"Govinder",
"Keshlan S.",
""
]
] | Self-similar spacetimes are of importance to cosmology and to gravitational collapse problems. We show that self-similarity or the existence of a homothetic Killing vector field for spherically symmetric spacetimes implies the separability of the spacetime metric in terms of the co-moving coordinates and that the metri... |
gr-qc/0106062 | Neil J. Cornish | Neil J. Cornish | Chaos and Gravitational Waves | 4 pages, no figures | Phys.Rev. D64 (2001) 084011 | 10.1103/PhysRevD.64.084011 | null | gr-qc | null | The gravitational waveforms of a chaotic system will exhibit sensitive
dependence on initial conditions. The waveforms of nearby orbits decohere on a
timescale fixed by the largest Lyapunov exponent of the orbit. The loss of
coherence has important observational consequences for systems where the
Lyapunov timescale i... | [
{
"created": "Wed, 20 Jun 2001 21:31:52 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Cornish",
"Neil J.",
""
]
] | The gravitational waveforms of a chaotic system will exhibit sensitive dependence on initial conditions. The waveforms of nearby orbits decohere on a timescale fixed by the largest Lyapunov exponent of the orbit. The loss of coherence has important observational consequences for systems where the Lyapunov timescale is ... |
2402.06895 | Amarkumar Agrawal | A.S. Agrawal | Bouncing Scenario and Cosmic Dynamics in Modified Theories of Gravity | Ph.D. Thesis. The thesis contains the publications: Gravitation and
Cosmology 29 (3), 294-304, Fortschritte der Physik 70 (1), 2100065, The
European Physical Journal C 83 (113), Physics of the Dark Universe 33,
100863, The European Physical Journal C 84 (1), 56 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main objective of this study is to investigate the phenomenon of the
bouncing scenario of the universe. The most widely recognized cosmological
framework is the standard cosmological model, sometimes referred to as the Big
Bang model. This is mainly because of its inherent properties and its
consistent alignment ... | [
{
"created": "Sat, 10 Feb 2024 07:32:18 GMT",
"version": "v1"
}
] | 2024-02-13 | [
[
"Agrawal",
"A. S.",
""
]
] | The main objective of this study is to investigate the phenomenon of the bouncing scenario of the universe. The most widely recognized cosmological framework is the standard cosmological model, sometimes referred to as the Big Bang model. This is mainly because of its inherent properties and its consistent alignment wi... |
0906.2016 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia, Niccolo' Loret, Gianluca Mandanici, Flavio
Mercati | UV and IR quantum-spacetime effects for the Chandrasekhar model | 12 pages, LaTex | null | 10.1142/S0218271812500526 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We modify the Chandrasekhar model of white dwarfs by introducing novel
momentum-space features that characterize the analysis of some
quantum-spacetime scenarios. We find that the rather standard ultraviolet
effects of spacetime quantization can only be significant in a regime where the
Chandrasekhar model anyway lac... | [
{
"created": "Thu, 11 Jun 2009 17:55:43 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Oct 2011 19:45:18 GMT",
"version": "v2"
}
] | 2013-03-21 | [
[
"Amelino-Camelia",
"Giovanni",
""
],
[
"Loret",
"Niccolo'",
""
],
[
"Mandanici",
"Gianluca",
""
],
[
"Mercati",
"Flavio",
""
]
] | We modify the Chandrasekhar model of white dwarfs by introducing novel momentum-space features that characterize the analysis of some quantum-spacetime scenarios. We find that the rather standard ultraviolet effects of spacetime quantization can only be significant in a regime where the Chandrasekhar model anyway lacks... |
1803.10819 | Sourabh Nampalliwar | Sourabh Nampalliwar, Cosimo Bambi, Kostas Kokkotas and Roman Konoplya | Iron line spectroscopy with Einstein-dilaton-Gauss-Bonnet black holes | 11 pages, 5 figures | Phys.Lett.B781:626-632,2018 | 10.1016/j.physletb.2018.04.053 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein-dilaton-Gauss-Bonnet gravity is a well-motivated alternative theory
of gravity that emerges naturally from string theory. While black hole
solutions have been known in this theory in numerical form for a while, an
approximate analytical metric was obtained recently by some of us, which allows
for faster and ... | [
{
"created": "Wed, 28 Mar 2018 19:21:20 GMT",
"version": "v1"
}
] | 2018-05-17 | [
[
"Nampalliwar",
"Sourabh",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Kokkotas",
"Kostas",
""
],
[
"Konoplya",
"Roman",
""
]
] | Einstein-dilaton-Gauss-Bonnet gravity is a well-motivated alternative theory of gravity that emerges naturally from string theory. While black hole solutions have been known in this theory in numerical form for a while, an approximate analytical metric was obtained recently by some of us, which allows for faster and mo... |
1506.05182 | Alfredo Herrera-Aguilar | Alfredo Herrera-Aguilar and Ulises Nucamendi | Kerr black hole parameters in terms of red/blue shifts of photons
emitted by geodesic particles | 8 pages in latex, no figures | null | 10.1103/PhysRevD.92.045024 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We are motivated by the recently reported dynamical evidence of stars with
short orbital periods moving around the center of the Milky Way and the
corresponding hypothesis about the existence of a supermassive black hole
hosted at its center. In this paper we show how the mass and rotation
parameters of a Kerr black ... | [
{
"created": "Wed, 17 Jun 2015 02:01:18 GMT",
"version": "v1"
}
] | 2015-08-26 | [
[
"Herrera-Aguilar",
"Alfredo",
""
],
[
"Nucamendi",
"Ulises",
""
]
] | We are motivated by the recently reported dynamical evidence of stars with short orbital periods moving around the center of the Milky Way and the corresponding hypothesis about the existence of a supermassive black hole hosted at its center. In this paper we show how the mass and rotation parameters of a Kerr black ho... |
2308.13349 | Joan Sola | Joan Sol\`a Peracaula | The dynamics of vacuum, gravity and matter: Implications on the
fundamental constants | Extended discussion, typos corrected, references added | International Journal of Modern Physics A, 2024 | 10.1142/S0217751X24410161 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The possibility that the vacuum energy density (VED), $\rho_{\rm vac}$, could
be time dependent in the expanding Universe is intuitively more reasonable than
just a rigid cosmological constant for the entire cosmic history. The dynamics
of $\rho_{\rm vac}=\rho_{\rm vac}(H)$ as a function of the Hubble rate, $H(t)$,
m... | [
{
"created": "Fri, 25 Aug 2023 12:43:11 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2023 17:59:14 GMT",
"version": "v2"
},
{
"created": "Sun, 10 Sep 2023 16:48:43 GMT",
"version": "v3"
}
] | 2024-04-29 | [
[
"Peracaula",
"Joan Solà",
""
]
] | The possibility that the vacuum energy density (VED), $\rho_{\rm vac}$, could be time dependent in the expanding Universe is intuitively more reasonable than just a rigid cosmological constant for the entire cosmic history. The dynamics of $\rho_{\rm vac}=\rho_{\rm vac}(H)$ as a function of the Hubble rate, $H(t)$, mos... |
1211.6534 | Sanjay Sarwe | Sanjay Sarwe and R. V. Saraykar | Stability Analysis in N dimensional Gravitational collapse with equation
of state | 11 pages. arXiv admin note: text overlap with arXiv:gr-qc/0406052 by
other authors | Grav.Cosmol. 20(2014) 282-289 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study stability of occurrence of black holes and naked singularities that
arise as a final state for a complete gravitational collapse of type I matter
field in a spherically symmetric $N$ dimensional spacetime with equation of
state $p = k \rho$, $0 \leq k \leq 1$. We prove that for a regular initial data
compris... | [
{
"created": "Wed, 28 Nov 2012 07:53:12 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Nov 2014 16:52:42 GMT",
"version": "v2"
}
] | 2014-11-26 | [
[
"Sarwe",
"Sanjay",
""
],
[
"Saraykar",
"R. V.",
""
]
] | We study stability of occurrence of black holes and naked singularities that arise as a final state for a complete gravitational collapse of type I matter field in a spherically symmetric $N$ dimensional spacetime with equation of state $p = k \rho$, $0 \leq k \leq 1$. We prove that for a regular initial data comprisin... |
gr-qc/0611155 | Yungui Gong | Yungui Gong, Bin Wang and Anzhong Wang | Thermodynamical properties of dark energy | 5 two column pages, 2 figures; v2: discussion on thermal equilibrium
with the horizon is added, v3: minor corrections, published in PRD | Phys.Rev.D75:123516,2007 | 10.1103/PhysRevD.75.123516 | null | gr-qc astro-ph hep-th | null | We have investigated the thermodynamical properties of dark energy. Assuming
that the dark energy temperature $T\sim a^{-n}$ and considering that the volume
of the Universe enveloped by the apparent horizon relates to the temperature,
we have derived the dark energy entropy. For dark energy with constant equation
of ... | [
{
"created": "Thu, 30 Nov 2006 03:40:13 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jan 2007 15:51:13 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Jun 2007 21:56:19 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Gong",
"Yungui",
""
],
[
"Wang",
"Bin",
""
],
[
"Wang",
"Anzhong",
""
]
] | We have investigated the thermodynamical properties of dark energy. Assuming that the dark energy temperature $T\sim a^{-n}$ and considering that the volume of the Universe enveloped by the apparent horizon relates to the temperature, we have derived the dark energy entropy. For dark energy with constant equation of st... |
2008.10825 | Ashu Kushwaha | Ashu Kushwaha, S. Shankaranarayanan (IIT Bombay) | Helical magnetic fields from Riemann coupling | v2: 26 pages,3 figures, Accepted in Phys. Rev. D | Phys. Rev. D 102, 103528 (2020) | 10.1103/PhysRevD.102.103528 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the inflationary generation of helical magnetic fields from the
Riemann coupling with the electromagnetic field. Most models in the literature
introduce non-minimal coupling to the electromagnetic fields with a scalar
field, hence, breaking the conformal invariance. In this work, we show that
non-minimal cou... | [
{
"created": "Tue, 25 Aug 2020 05:44:47 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Nov 2020 07:30:42 GMT",
"version": "v2"
}
] | 2020-11-25 | [
[
"Kushwaha",
"Ashu",
"",
"IIT Bombay"
],
[
"Shankaranarayanan",
"S.",
"",
"IIT Bombay"
]
] | We study the inflationary generation of helical magnetic fields from the Riemann coupling with the electromagnetic field. Most models in the literature introduce non-minimal coupling to the electromagnetic fields with a scalar field, hence, breaking the conformal invariance. In this work, we show that non-minimal coupl... |
2012.14434 | Steven B. Giddings | Steven B. Giddings | Black holes and other clues to the quantum structure of gravity | 7 pages. v2: added footnote and reference, and missing
acknowledgements | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bringing gravity into a quantum-mechanical framework is likely the most
profound remaining problem in fundamental physics. The "unitarity crisis" for
black hole evolution appears to be a key facet of this problem, whose
resolution will provide important clues. Investigating this raises the
important structural questi... | [
{
"created": "Mon, 28 Dec 2020 18:59:47 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Feb 2021 20:24:00 GMT",
"version": "v2"
}
] | 2021-02-22 | [
[
"Giddings",
"Steven B.",
""
]
] | Bringing gravity into a quantum-mechanical framework is likely the most profound remaining problem in fundamental physics. The "unitarity crisis" for black hole evolution appears to be a key facet of this problem, whose resolution will provide important clues. Investigating this raises the important structural question... |
gr-qc/9811083 | Horacio Casini | H.Casini, R.Montemayor and P.Sisterna | Stochastic approach to inflation II: classicality, coarse-graining and
noises | 18 pages, revtex, no figures | Phys.Rev.D59:063512,1999 | 10.1103/PhysRevD.59.063512 | null | gr-qc | null | In this work we generalize a previously developed semiclassical approach to
inflation, devoted to the analysis of the effective dynamics of coarse-grained
fields, which are essential to the stochastic approach to inflation. We
consider general non-trivial momentum distributions when defining these fields.
The use of ... | [
{
"created": "Tue, 24 Nov 1998 13:20:33 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Casini",
"H.",
""
],
[
"Montemayor",
"R.",
""
],
[
"Sisterna",
"P.",
""
]
] | In this work we generalize a previously developed semiclassical approach to inflation, devoted to the analysis of the effective dynamics of coarse-grained fields, which are essential to the stochastic approach to inflation. We consider general non-trivial momentum distributions when defining these fields. The use of sm... |
2007.03139 | Kangjae Lee | Kangjae Lee, Tetsuya Shiromizu, Hirotaka Yoshino, Keisuke Izumi,
Yoshimune Tomikawa | Loosely trapped surface and dynamically transversely trapping surface in
Einstein-Maxwell system | 15 pages, 4 figures | null | null | OCU-PHYS-521, AP-GR-161 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of the loosely trapped surface (LTS) and the
dynamically transversely trapping surface (DTTS) in Einstein-Maxwell systems.
These concepts of surfaces were proposed by the four of the present authors in
order to characterize strong gravity regions. We prove the Penrose-like
inequalities for the... | [
{
"created": "Tue, 7 Jul 2020 00:19:20 GMT",
"version": "v1"
}
] | 2020-07-09 | [
[
"Lee",
"Kangjae",
""
],
[
"Shiromizu",
"Tetsuya",
""
],
[
"Yoshino",
"Hirotaka",
""
],
[
"Izumi",
"Keisuke",
""
],
[
"Tomikawa",
"Yoshimune",
""
]
] | We study the properties of the loosely trapped surface (LTS) and the dynamically transversely trapping surface (DTTS) in Einstein-Maxwell systems. These concepts of surfaces were proposed by the four of the present authors in order to characterize strong gravity regions. We prove the Penrose-like inequalities for the a... |
2307.07858 | Ward Struyve | Ward Struyve | The Bohmian solution to the problem of time | 13 pages, no figures, LaTex, to appear in the memorial volume in the
honor of Detlef D\"urr | null | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | In canonical quantum gravity the wave function of the universe is static,
leading to the so-called problem of time. We summarize here how Bohmian
mechanics solves this problem.
| [
{
"created": "Sat, 15 Jul 2023 17:44:30 GMT",
"version": "v1"
}
] | 2023-07-18 | [
[
"Struyve",
"Ward",
""
]
] | In canonical quantum gravity the wave function of the universe is static, leading to the so-called problem of time. We summarize here how Bohmian mechanics solves this problem. |
1802.10201 | Laura Bernard | Laura Bernard | Dynamics of compact binary systems in scalar-tensor theories: I.
Equations of motion to the third post-Newtonian order | 24 pages, matches the published version, typos corrected | Phys. Rev. D 98, 044004 (2018) | 10.1103/PhysRevD.98.044004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar-tensor theories are one of the most natural and well-constrained
alternative theories of gravity, while still allowing for significant
deviations from general relativity. We present the equations of motion of
nonspinning compact binary systems at the third post-Newtonian (PN) order in
massless scalar-tensor th... | [
{
"created": "Tue, 27 Feb 2018 22:56:43 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2018 18:07:47 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Dec 2018 01:20:41 GMT",
"version": "v3"
},
{
"created": "Wed, 1 Mar 2023 10:34:44 GMT",
"version": "v4"
}
] | 2023-03-02 | [
[
"Bernard",
"Laura",
""
]
] | Scalar-tensor theories are one of the most natural and well-constrained alternative theories of gravity, while still allowing for significant deviations from general relativity. We present the equations of motion of nonspinning compact binary systems at the third post-Newtonian (PN) order in massless scalar-tensor theo... |
gr-qc/0312006 | Alexander Kaganovich B. | E. I. Guendelman and A. B. Kaganovich | Is Cosmic Coincidence a Consequence of a Law of Nature? | 26 pages; some typos corrected | null | null | null | gr-qc astro-ph hep-th | null | A field theory is proposed where the regular fermionic matter and the dark
fermionic matter are different states of the same "primordial" fermion fields.
In regime of the fermion densities typical for normal particle physics, the
primordial fermions split into three families identified with regular fermions.
When fer... | [
{
"created": "Mon, 1 Dec 2003 14:01:05 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Dec 2003 09:03:51 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Dec 2003 09:37:45 GMT",
"version": "v3"
},
{
"created": "Fri, 26 Dec 2003 07:04:15 GMT",
"version": "v4"
},
{
"cre... | 2007-05-23 | [
[
"Guendelman",
"E. I.",
""
],
[
"Kaganovich",
"A. B.",
""
]
] | A field theory is proposed where the regular fermionic matter and the dark fermionic matter are different states of the same "primordial" fermion fields. In regime of the fermion densities typical for normal particle physics, the primordial fermions split into three families identified with regular fermions. When fermi... |
1403.5433 | Taeyoon Moon | Yun Soo Myung and Taeyoon Moon | Massive gravitational waves in Chern-Simons modified gravity | 1+12 pages, 1 figure, version accepted for publication in JCAP | null | 10.1088/1475-7516/2014/10/043 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the nondynamical Chern-Simons (nCS) modified gravity, which is
regarded as a parity-odd theory of massive gravity in four dimensions. We first
find polarization modes of gravitational waves for $\theta=x/\mu$ in nCS
modified gravity by using the Newman-Penrose formalism where the null complex
tetrad is ne... | [
{
"created": "Fri, 21 Mar 2014 11:59:53 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Sep 2014 00:17:24 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Myung",
"Yun Soo",
""
],
[
"Moon",
"Taeyoon",
""
]
] | We consider the nondynamical Chern-Simons (nCS) modified gravity, which is regarded as a parity-odd theory of massive gravity in four dimensions. We first find polarization modes of gravitational waves for $\theta=x/\mu$ in nCS modified gravity by using the Newman-Penrose formalism where the null complex tetrad is nece... |
1811.08559 | Jorge Ovalle | J Ovalle, R Casadio, R da Rocha, A Sotomayor, Z Stuchlik | Einstein-Klein-Gordon by gravitational decoupling | 16 pages, 2 figures. arXiv admin note: text overlap with
arXiv:1804.03468 | EPL 124 20004 (2018) | 10.1209/0295-5075/124/20004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate how a spherically symmetric scalar field can modify the
Schwarzschild vacuum solution when there is no exchange of energy-momentum
between the scalar field and the central source of the Schwarzschild metric.
This system is described by means of the gravitational decoupling by Minimal
Geometric Deformat... | [
{
"created": "Tue, 20 Nov 2018 16:24:07 GMT",
"version": "v1"
}
] | 2018-11-22 | [
[
"Ovalle",
"J",
""
],
[
"Casadio",
"R",
""
],
[
"da Rocha",
"R",
""
],
[
"Sotomayor",
"A",
""
],
[
"Stuchlik",
"Z",
""
]
] | We investigate how a spherically symmetric scalar field can modify the Schwarzschild vacuum solution when there is no exchange of energy-momentum between the scalar field and the central source of the Schwarzschild metric. This system is described by means of the gravitational decoupling by Minimal Geometric Deformatio... |
1409.3830 | Florent Michel | L\'eo-Paul Euv\'e, Florent Michel, Renaud Parentani, Germain Rousseaux | Wave blocking and partial transmission in subcritical flows over an
obstacle | 15 pages, 10 figures | Phys. Rev. D 91, 024020 (2015) | 10.1103/PhysRevD.91.024020 | LPT-Orsay-15-03 | gr-qc physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study and measure the transmission coefficient of counter-propagating
shallow-water waves produced by a wave generator and scattered by an obstacle.
To precisely compare theoretical predictions and experimental data, we consider
$\sim 25$ frequencies for 5 subcritical background flows, where the maximum
value of t... | [
{
"created": "Fri, 12 Sep 2014 19:43:44 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Feb 2015 07:28:39 GMT",
"version": "v2"
}
] | 2015-10-19 | [
[
"Euvé",
"Léo-Paul",
""
],
[
"Michel",
"Florent",
""
],
[
"Parentani",
"Renaud",
""
],
[
"Rousseaux",
"Germain",
""
]
] | We study and measure the transmission coefficient of counter-propagating shallow-water waves produced by a wave generator and scattered by an obstacle. To precisely compare theoretical predictions and experimental data, we consider $\sim 25$ frequencies for 5 subcritical background flows, where the maximum value of the... |
gr-qc/0211061 | Ken-ichi Nakao | Ken-ichi Nakao, Naoki Kobayashi and Hideki Ishihara | How Does Naked Singularity Look? | 36 pages, 9 figures | Phys.Rev. D67 (2003) 084002 | 10.1103/PhysRevD.67.084002 | OCU-PHYS-191, AP-GR-8 | gr-qc | null | There are non-radial null geodesics emanating from the shell focusing
singularity formed at the symmetric center in a spherically symmetric dust
collapse. In this article, assuming the self-similarity in the region filled
with the dust fluid, we study these singular null geodesics in detail. We see
the time evolution... | [
{
"created": "Mon, 18 Nov 2002 09:56:09 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Nakao",
"Ken-ichi",
""
],
[
"Kobayashi",
"Naoki",
""
],
[
"Ishihara",
"Hideki",
""
]
] | There are non-radial null geodesics emanating from the shell focusing singularity formed at the symmetric center in a spherically symmetric dust collapse. In this article, assuming the self-similarity in the region filled with the dust fluid, we study these singular null geodesics in detail. We see the time evolution o... |
gr-qc/0612168 | John Klauder | John R. Klauder | Fundamentals of Quantum Gravity | 15 pages, conference proceedings | J.Phys.Conf.Ser.87:012012,2007 | 10.1088/1742-6596/87/1/012012 | null | gr-qc | null | The outline of a recent approach to quantum gravity is presented. Novel
ingredients include: (1) Affine kinematical variables; (2) Affine coherent
states; (3) Projection operator approach toward quantum constraints; (4)
Continuous-time regularized functional integral representation without/with
constraints; and (5) H... | [
{
"created": "Tue, 26 Dec 2006 20:14:48 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Klauder",
"John R.",
""
]
] | The outline of a recent approach to quantum gravity is presented. Novel ingredients include: (1) Affine kinematical variables; (2) Affine coherent states; (3) Projection operator approach toward quantum constraints; (4) Continuous-time regularized functional integral representation without/with constraints; and (5) Har... |
0905.2992 | Michael Kavic | Vishnu Jejjala, Michael Kavic, Djordje Minic and Chia-Hsiung Tze | The Big Bang as the Ultimate Traffic Jam | 8 pages, This essay received an honorable mention in the Gravity
Research Foundation Essay Competition, 2009 | Int.J.Mod.Phys.D18:2257-2263,2009 | 10.1142/S021827180901593X | IHES P/09/23, VPI-IPNAS-09-04 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel solution to the nature and formation of the initial state
of the Universe. It derives from the physics of a generally covariant extension
of Matrix theory. We focus on the dynamical state space of this background
independent quantum theory of gravity and matter, an infinite dimensional,
complex non... | [
{
"created": "Mon, 18 May 2009 22:03:45 GMT",
"version": "v1"
}
] | 2010-02-17 | [
[
"Jejjala",
"Vishnu",
""
],
[
"Kavic",
"Michael",
""
],
[
"Minic",
"Djordje",
""
],
[
"Tze",
"Chia-Hsiung",
""
]
] | We present a novel solution to the nature and formation of the initial state of the Universe. It derives from the physics of a generally covariant extension of Matrix theory. We focus on the dynamical state space of this background independent quantum theory of gravity and matter, an infinite dimensional, complex non-l... |
gr-qc/0611036 | Ludovico Carbone | L. Carbone, A. Cavalleri, G. Ciani, R. Dolesi, M. Hueller,
D.Tombolato, S. Vitale and W. J. Weber | Torsion pendulum facility for direct force measurements of LISA GRS
related disturbances | Submitted to Proceedings of the 6th International LISA Symposium, AIP
Conference Proceedings 2006 | AIPConf.Proc.873:561-565,2006 | 10.1063/1.2405099 | null | gr-qc | null | A four mass torsion pendulum facility for testing of the LISA GRS is under
development in Trento. With a LISA-like test mass suspended off-axis with
respect to the pendulum fiber, the facility allows for a direct measurement of
surface force disturbances arising in the GRS. We present here results with a
prototype pe... | [
{
"created": "Mon, 6 Nov 2006 12:37:02 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Carbone",
"L.",
""
],
[
"Cavalleri",
"A.",
""
],
[
"Ciani",
"G.",
""
],
[
"Dolesi",
"R.",
""
],
[
"Hueller",
"M.",
""
],
[
"Tombolato",
"D.",
""
],
[
"Vitale",
"S.",
""
],
[
"Weber",
"W. J.",
... | A four mass torsion pendulum facility for testing of the LISA GRS is under development in Trento. With a LISA-like test mass suspended off-axis with respect to the pendulum fiber, the facility allows for a direct measurement of surface force disturbances arising in the GRS. We present here results with a prototype pend... |
1801.10406 | Diego Rubiera-Garcia | V. I. Afonso, Gonzalo J. Olmo, D. Rubiera-Garcia | Mapping Ricci-based theories of gravity into general relativity | 6 double column pages | null | 10.1103/PhysRevD.97.021503 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the space of solutions of a wide family of Ricci-based
metric-affine theories of gravity can be put into correspondence with the space
of solutions of general relativity (GR). This allows us to use well-established
methods and results from GR to explore new gravitational physics beyond it.
| [
{
"created": "Wed, 31 Jan 2018 11:22:23 GMT",
"version": "v1"
}
] | 2018-03-14 | [
[
"Afonso",
"V. I.",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Rubiera-Garcia",
"D.",
""
]
] | We show that the space of solutions of a wide family of Ricci-based metric-affine theories of gravity can be put into correspondence with the space of solutions of general relativity (GR). This allows us to use well-established methods and results from GR to explore new gravitational physics beyond it. |
gr-qc/0505008 | George E. A. Matsas | George E. A. Matsas and Andre R. Rocha da Silva | New thought experiment to test the generalized second law of
thermodynamics | 4 pages (revtex), 3 figures | Phys.Rev. D71 (2005) 107501 | 10.1103/PhysRevD.71.107501 | null | gr-qc | null | We propose an extension of the original thought experiment proposed by
Geroch, which sparked much of the actual debate and interest on black hole
thermodynamics, and show that the generalized second law of thermodynamics is
in compliance with it.
| [
{
"created": "Mon, 2 May 2005 12:21:29 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2005 18:04:35 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Matsas",
"George E. A.",
""
],
[
"da Silva",
"Andre R. Rocha",
""
]
] | We propose an extension of the original thought experiment proposed by Geroch, which sparked much of the actual debate and interest on black hole thermodynamics, and show that the generalized second law of thermodynamics is in compliance with it. |
2405.05315 | Thomas Spieksma | Enrico Cannizzaro, Thomas F.M. Spieksma, Vitor Cardoso, Taishi Ikeda | Impact of a plasma on the relaxation of black holes | 11 pages, 5 figures, version to appear in Physical Review D Letters | null | null | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Our universe is permeated with interstellar plasma, which prevents
propagation of low-frequency electromagnetic waves. Here, we show that two
dramatic consequences arise out of such suppression; (i) if plasma permeates
the light ring of a black hole, electromagnetic modes are screened entirely
from the gravitational-... | [
{
"created": "Wed, 8 May 2024 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jul 2024 14:12:06 GMT",
"version": "v2"
}
] | 2024-07-03 | [
[
"Cannizzaro",
"Enrico",
""
],
[
"Spieksma",
"Thomas F. M.",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Ikeda",
"Taishi",
""
]
] | Our universe is permeated with interstellar plasma, which prevents propagation of low-frequency electromagnetic waves. Here, we show that two dramatic consequences arise out of such suppression; (i) if plasma permeates the light ring of a black hole, electromagnetic modes are screened entirely from the gravitational-wa... |
0805.4004 | Eyo Ita III | Eyo Eyo Ita III | Canonical quantization of Plebanski gravity in diagonal variables | 26 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we have carried out a transformation from Ashtekar's theory of
GR into a reduced theory where the physical degrees of freedom are explicit. We
have performed the canonical analysis, computed the classical dynamics and have
performed a quantization on this reduced space, constructing a Hilbert space of
s... | [
{
"created": "Mon, 26 May 2008 19:08:07 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jun 2008 11:08:11 GMT",
"version": "v2"
},
{
"created": "Fri, 30 Apr 2010 15:38:38 GMT",
"version": "v3"
},
{
"created": "Mon, 3 May 2010 19:51:12 GMT",
"version": "v4"
},
{
"cr... | 2010-09-07 | [
[
"Ita",
"Eyo Eyo",
"III"
]
] | In this paper we have carried out a transformation from Ashtekar's theory of GR into a reduced theory where the physical degrees of freedom are explicit. We have performed the canonical analysis, computed the classical dynamics and have performed a quantization on this reduced space, constructing a Hilbert space of sta... |
1801.07973 | Rong-Jia Yang | Rong-Jia Yang | Constraints from accretion onto a Tangherlini-Reissner-Nordstrom black
hole | 8 pages, no figures | Eur. Phys. J. C 79 (2019) 367 | 10.1140/epjc/s10052-019-6886-1 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate spherically symmetric, steady state, adiabatic accretion onto
a Tangherlini-Reissner-Nordstrom black hole in arbitrary dimensions by using
$D$-dimensional general relativity. We obtain basic equations for accretion and
determine analytically the critical points, the critical fluid velocity, and
the cri... | [
{
"created": "Wed, 24 Jan 2018 13:22:26 GMT",
"version": "v1"
},
{
"created": "Thu, 15 Nov 2018 08:05:26 GMT",
"version": "v2"
},
{
"created": "Sun, 28 Apr 2019 13:43:38 GMT",
"version": "v3"
}
] | 2019-04-30 | [
[
"Yang",
"Rong-Jia",
""
]
] | We investigate spherically symmetric, steady state, adiabatic accretion onto a Tangherlini-Reissner-Nordstrom black hole in arbitrary dimensions by using $D$-dimensional general relativity. We obtain basic equations for accretion and determine analytically the critical points, the critical fluid velocity, and the criti... |
gr-qc/9710058 | Gagik Ter-Gazarian | G.T.Ter-Kazarian (Byurakan Observatory) | Gravitation Gauge Group | LaTex, 14 pages, email gago@bao.sci.am | Nuovo-Cimento, 1997, v112B, No6, 825-837 | null | BAO/96/57 | gr-qc | null | Suggested theory involves a drastic revision of a role of local internal
symmetries in physical concept of curved geometry. Under the reflection of
fields and their dynamics from Minkowski to Riemannian space a standard gauge
principle of local internal symmetries is generalized. The gravitation gauge
group is propos... | [
{
"created": "Fri, 10 Oct 1997 09:14:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ter-Kazarian",
"G. T.",
"",
"Byurakan Observatory"
]
] | Suggested theory involves a drastic revision of a role of local internal symmetries in physical concept of curved geometry. Under the reflection of fields and their dynamics from Minkowski to Riemannian space a standard gauge principle of local internal symmetries is generalized. The gravitation gauge group is proposed... |
2106.07638 | Maxim Eingorn | Maxim Eingorn, A. Emrah Yukselci, Alexander Zhuk | Screening vs. gevolution: in chase of a perfect cosmological simulation
code | 16 pages, 3 figures | Physics Letters B 826 (2022) 136911 | 10.1016/j.physletb.2022.136911 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We compare two competing relativistic approaches to the N-body simulation of
the Universe large-scale structure. To this end, employing the corresponding
alternative computer codes ("gevolution" and "screening"), we conduct a series
of cosmological simulations in boxes of different sizes and calculate the power
spect... | [
{
"created": "Mon, 14 Jun 2021 17:54:59 GMT",
"version": "v1"
}
] | 2022-02-09 | [
[
"Eingorn",
"Maxim",
""
],
[
"Yukselci",
"A. Emrah",
""
],
[
"Zhuk",
"Alexander",
""
]
] | We compare two competing relativistic approaches to the N-body simulation of the Universe large-scale structure. To this end, employing the corresponding alternative computer codes ("gevolution" and "screening"), we conduct a series of cosmological simulations in boxes of different sizes and calculate the power spectra... |
gr-qc/0209041 | B. V. Ivanov | B.V.Ivanov | Colliding beams of light | 8 pages, RevTex, journal version, to appear in CQG | Class.Quant.Grav. 20 (2003) 397-406 | 10.1088/0264-9381/20/3/301 | null | gr-qc | null | The stationary gravitational field of two identical counter-moving beams of
pure radiation is found in full generality. The solution depends on an
arbitrary function and a parameter which sets the scale of the energy density.
Some of its properties are studied. Previous particular solutions are derived
as subcases.
| [
{
"created": "Thu, 12 Sep 2002 09:01:06 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Dec 2002 09:11:38 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Ivanov",
"B. V.",
""
]
] | The stationary gravitational field of two identical counter-moving beams of pure radiation is found in full generality. The solution depends on an arbitrary function and a parameter which sets the scale of the energy density. Some of its properties are studied. Previous particular solutions are derived as subcases. |
gr-qc/0007061 | Tamath Rainsford | Tamath Rainsford (University of Adelaide) | Anisotropic Homogeneous Cosmologies in the Post-Newtonian Approximation | 22 pages, LATEX | Gen.Rel.Grav. 33 (2001) 1047-1076 | 10.1023/A:1010280332043 | null | gr-qc | null | In this paper we explore how far the post-Newtonian theory goes in overcoming
the difficulties associated with anisotropic homogeneous cosmologies in the
Newtonian approximation. It will be shown that, unlike in the Newtonian case,
the cosmological equations of the post-Newtonian approximation are much more in
the sp... | [
{
"created": "Sun, 23 Jul 2000 15:28:48 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Rainsford",
"Tamath",
"",
"University of Adelaide"
]
] | In this paper we explore how far the post-Newtonian theory goes in overcoming the difficulties associated with anisotropic homogeneous cosmologies in the Newtonian approximation. It will be shown that, unlike in the Newtonian case, the cosmological equations of the post-Newtonian approximation are much more in the spir... |
gr-qc/9509033 | null | K. S. Virbhadra | Gravitational and electromagnetic fields of a charged tachyon | 8 pages, LaTex, To appear in Pramana- J. Physics | Pramana 45 (1995) 175-179 | 10.1007/BF02848260 | PRL-TH-91-37 | gr-qc astro-ph hep-th | null | An axially symmetric exact solution of the Einstein-Maxwell equations is
obtained and is interpreted to give the gravitational and electromagnetic
fields of a charged tachyon. Switching off the charge parameter yields the
solution for the uncharged tachyon which was earlier obtained by Vaidya. The
null surfaces for t... | [
{
"created": "Thu, 21 Sep 1995 11:38:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Virbhadra",
"K. S.",
""
]
] | An axially symmetric exact solution of the Einstein-Maxwell equations is obtained and is interpreted to give the gravitational and electromagnetic fields of a charged tachyon. Switching off the charge parameter yields the solution for the uncharged tachyon which was earlier obtained by Vaidya. The null surfaces for the... |
1911.07593 | Oliver J. Tattersall | Oliver J. Tattersall | Quasi-Normal Modes of Hairy Scalar Tensor Black Holes: Odd Parity | Updated to match Classical and Quantum Gravity accepted version | null | 10.1088/1361-6382/ab839b | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The odd parity gravitational Quasi-Normal Mode spectrum of black holes with
non-trivial scalar hair in Horndeski gravity is investigated. We study `almost'
Schwarzschild black holes such that any modifications to the spacetime geometry
(including the scalar field profile) are treated as small quantities. A
modified R... | [
{
"created": "Mon, 18 Nov 2019 12:53:37 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Mar 2020 09:07:18 GMT",
"version": "v2"
}
] | 2020-04-01 | [
[
"Tattersall",
"Oliver J.",
""
]
] | The odd parity gravitational Quasi-Normal Mode spectrum of black holes with non-trivial scalar hair in Horndeski gravity is investigated. We study `almost' Schwarzschild black holes such that any modifications to the spacetime geometry (including the scalar field profile) are treated as small quantities. A modified Reg... |
1906.11284 | Md Sabir Ali | Md Sabir Ali, Sushant G Ghosh | Thermodynamics and phase transition of rotating regular-de Sitter black
holes | 16pp, 34 figures | Eur. Phys. J. Plus (2022) 137:486 | 10.1140/epjp/s13360-022-02703-w | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze thermodynamic properties of the rotating regular black holes
having mass ($M$), angular momentum ($a$), and a magnetic charge $(g)$, and
encompass Kerr black hole ($g=0$). The mass $M$ has a minimum at the radius
$r_+=r_+^{\star}$, where both the heat capacity and temperature vanish. The
thermal phase tran... | [
{
"created": "Wed, 26 Jun 2019 18:21:09 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Apr 2022 16:32:08 GMT",
"version": "v2"
}
] | 2022-04-21 | [
[
"Ali",
"Md Sabir",
""
],
[
"Ghosh",
"Sushant G",
""
]
] | We analyze thermodynamic properties of the rotating regular black holes having mass ($M$), angular momentum ($a$), and a magnetic charge $(g)$, and encompass Kerr black hole ($g=0$). The mass $M$ has a minimum at the radius $r_+=r_+^{\star}$, where both the heat capacity and temperature vanish. The thermal phase transi... |
gr-qc/0307115 | Noriko Shiiki | Nobuyuki Sawado and Noriko Shiiki | Axially Symmetric Black Hole Skyrmions | 7 pages, 6 figures | EconfC0306234:1442-1447,2003 | null | null | gr-qc hep-th | null | It has been known that a B=2 skyrmion is axially symmetric. We consider the
Skyrme model coupled to gravity and obtain static axially symmetric black hole
solutions numerically. The black hole skyrmion no longer has integer baryonic
charge but has fractional charge outside the horizon as in the spherically
symmetric ... | [
{
"created": "Tue, 29 Jul 2003 09:35:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sawado",
"Nobuyuki",
""
],
[
"Shiiki",
"Noriko",
""
]
] | It has been known that a B=2 skyrmion is axially symmetric. We consider the Skyrme model coupled to gravity and obtain static axially symmetric black hole solutions numerically. The black hole skyrmion no longer has integer baryonic charge but has fractional charge outside the horizon as in the spherically symmetric ca... |
1210.4684 | Stoytcho Yazadjiev | Stoytcho S. Yazadjiev | Area-angular momentum-charge inequality for stable marginally outer
trapped surfaces in 4D Einstein-Maxwell-dilaton theory | 12 pages;v2 more detailed proof of Lemma 2, references and comments
added, typos corrected | null | 10.1103/PhysRevD.87.024016 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive inequalities between the area, the angular momentum and the charges
for axisymmetric closed outermost stably marginally outer trapped surfaces,
embedded in dynamical and, in general, non-axisymmetric spacetimes satisfying
the Einstein-Maxwell-dilaton-matter equations. In proving the inequalities we
assume t... | [
{
"created": "Wed, 17 Oct 2012 10:01:19 GMT",
"version": "v1"
},
{
"created": "Sun, 6 Jan 2013 08:51:24 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | We derive inequalities between the area, the angular momentum and the charges for axisymmetric closed outermost stably marginally outer trapped surfaces, embedded in dynamical and, in general, non-axisymmetric spacetimes satisfying the Einstein-Maxwell-dilaton-matter equations. In proving the inequalities we assume tha... |
2206.01546 | Kazuharu Bamba | Riasat Ali, Kazuharu Bamba, Syed Asif Ali Shah and Muhammad Junaid
Saleem | Tunneling Analysis of Kerr-Newman Black Hole-Like Solution in Rastall
Theory | 8 pages, 2 figures, version accepted for publication in International
Journal of Modern Physics D | null | 10.1142/S0218271822500699 | FU-PCG-67 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Hamilton-Jacobi ansatz is used to analyze boson charged particles tunneling
in Rastall gravity Kerr- Newman black hole (BH) surrounded by perfect fluid
matter through the horizon. The geometrical BH parameters are observed, how
these are affecting the radiation utilizing the Lagrangian gravity equation. In
this artic... | [
{
"created": "Thu, 2 Jun 2022 07:39:06 GMT",
"version": "v1"
}
] | 2022-06-06 | [
[
"Ali",
"Riasat",
""
],
[
"Bamba",
"Kazuharu",
""
],
[
"Shah",
"Syed Asif Ali",
""
],
[
"Saleem",
"Muhammad Junaid",
""
]
] | Hamilton-Jacobi ansatz is used to analyze boson charged particles tunneling in Rastall gravity Kerr- Newman black hole (BH) surrounded by perfect fluid matter through the horizon. The geometrical BH parameters are observed, how these are affecting the radiation utilizing the Lagrangian gravity equation. In this article... |
1602.08904 | Hedvika Kadlecova | Hedvika Kadlecov\'a and Ond\v{r}ej Klimo and Stefan Weber and Georg
Korn | Gravitational wave generation by interaction of high power lasers with
matter using shock waves | 10 pages, 5 images | EPJD 4, Vol. 71, 89 (2017) | 10.1140/epjd/e2017-70586-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave generation by a strong shock wave in the interaction of
high power laser with matter is analyzed in linear approximation of
gravitational theory. The analytical formulas and estimates are derived for the
metric perturbations and the radiated power of the generated gravitational
waves. Furthermore t... | [
{
"created": "Mon, 29 Feb 2016 10:55:44 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Aug 2016 12:25:51 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Feb 2017 13:08:47 GMT",
"version": "v3"
},
{
"created": "Tue, 18 Apr 2017 08:28:09 GMT",
"version": "v4"
}
] | 2017-05-24 | [
[
"Kadlecová",
"Hedvika",
""
],
[
"Klimo",
"Ondřej",
""
],
[
"Weber",
"Stefan",
""
],
[
"Korn",
"Georg",
""
]
] | Gravitational wave generation by a strong shock wave in the interaction of high power laser with matter is analyzed in linear approximation of gravitational theory. The analytical formulas and estimates are derived for the metric perturbations and the radiated power of the generated gravitational waves. Furthermore the... |
2205.08547 | Mark Ho-Yeuk Cheung | Emanuele Berti, Vitor Cardoso, Mark Ho-Yeuk Cheung, Francesco Di
Filippo, Francisco Duque, Paul Martens, Shinji Mukohyama | Stability of the fundamental quasinormal mode in time-domain
observations against small perturbations | 10 pages, 7 figures. Matches published version on PRD | Phys. Rev. D 106, 084036 (2022) | 10.1103/PhysRevD.106.084011 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole spectroscopy with gravitational waves is an important tool to
measure the mass and spin of astrophysical black holes and to test their Kerr
nature. Next-generation ground- and space-based detectors will observe binary
black hole mergers with large signal-to-noise ratios and perform spectroscopy
routinely. ... | [
{
"created": "Tue, 17 May 2022 18:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Oct 2022 19:30:30 GMT",
"version": "v2"
}
] | 2022-10-26 | [
[
"Berti",
"Emanuele",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Cheung",
"Mark Ho-Yeuk",
""
],
[
"Di Filippo",
"Francesco",
""
],
[
"Duque",
"Francisco",
""
],
[
"Martens",
"Paul",
""
],
[
"Mukohyama",
"Shinji",
... | Black hole spectroscopy with gravitational waves is an important tool to measure the mass and spin of astrophysical black holes and to test their Kerr nature. Next-generation ground- and space-based detectors will observe binary black hole mergers with large signal-to-noise ratios and perform spectroscopy routinely. It... |
gr-qc/0111092 | Matej Pavsic | Matej Pavsic | How the Geometric Calculus Resolves the Ordering Ambiguity of Quantum
Theory in Curved Space | 27 pages ; published version of the paper | Class.Quant.Grav. 20 (2003) 2697-2714 | 10.1088/0264-9381/20/13/318 | null | gr-qc hep-th | null | The long standing problem of the ordering ambiguity in the definition of the
Hamilton operator for a point particle in curved space is naturally resolved by
using the powerful geometric calculus based on Clifford Algebra. The momentum
operator is defined to be the vector derivative (the gradient) multiplied by
$-i$; ... | [
{
"created": "Tue, 27 Nov 2001 09:45:02 GMT",
"version": "v1"
},
{
"created": "Mon, 13 May 2002 14:01:46 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Nov 2002 18:17:50 GMT",
"version": "v3"
},
{
"created": "Tue, 10 Jun 2003 08:44:55 GMT",
"version": "v4"
}
] | 2009-11-07 | [
[
"Pavsic",
"Matej",
""
]
] | The long standing problem of the ordering ambiguity in the definition of the Hamilton operator for a point particle in curved space is naturally resolved by using the powerful geometric calculus based on Clifford Algebra. The momentum operator is defined to be the vector derivative (the gradient) multiplied by $-i$; it... |
1805.08408 | Lijing Shao | Lijing Shao, Norbert Wex, Michael Kramer | Testing the universality of free fall towards dark matter with radio
pulsars | 5 pages, 2 figures; accepted by PRL | Physical Review Letters 120, 241104 (2018) | 10.1103/PhysRevLett.120.241104 | null | gr-qc astro-ph.GA hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The violation of the weak equivalence principle (EP) in the gravitational
field of the Earth, described by the E\"otv\"os parameter $\eta_\oplus$, was
recently constrained to the level $\left|\eta_\oplus\right| \lesssim 10^{-14}$
by the MICROSCOPE space mission. The E\"otv\"os parameter $\eta_{\rm DM}$,
pertaining to... | [
{
"created": "Tue, 22 May 2018 05:57:05 GMT",
"version": "v1"
}
] | 2018-06-15 | [
[
"Shao",
"Lijing",
""
],
[
"Wex",
"Norbert",
""
],
[
"Kramer",
"Michael",
""
]
] | The violation of the weak equivalence principle (EP) in the gravitational field of the Earth, described by the E\"otv\"os parameter $\eta_\oplus$, was recently constrained to the level $\left|\eta_\oplus\right| \lesssim 10^{-14}$ by the MICROSCOPE space mission. The E\"otv\"os parameter $\eta_{\rm DM}$, pertaining to t... |
0806.1556 | Jun Jin Peng | Jun-Jin Peng | An Elementary Derivation of the Five Dimensional Myers-Perry Metric | 5 pages,no figures,accepted by GRG | Gen.Rel.Grav.41:147-152,2009 | 10.1007/s10714-008-0660-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the five dimensional Myers-Perry metric via an elementary method to
solve the vacuum Einstein field equations directly. This method firstly
proposed by Clotz is very simple since it merely involves four components of
Ricci tensor and only requires us to deal with some equations without second
derivatives' t... | [
{
"created": "Tue, 10 Jun 2008 01:50:57 GMT",
"version": "v1"
}
] | 2009-01-09 | [
[
"Peng",
"Jun-Jin",
""
]
] | We derive the five dimensional Myers-Perry metric via an elementary method to solve the vacuum Einstein field equations directly. This method firstly proposed by Clotz is very simple since it merely involves four components of Ricci tensor and only requires us to deal with some equations without second derivatives' ter... |
1808.05830 | Andrea Geralico | Donato Bini, Andrea Geralico | Relative-observer definition of the Simon tensor | 19 pages, 1 figure; published version | Class. Quantum Grav. 35, 105003 (2018) | 10.1088/1361-6382/aaae7d | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The definition of Simon tensor, originally given only in the Kerr spacetime
and associated with the static family of observers, is generalized to any
spacetime and to any possible observer family. Such generalization is obtained
by a standard "3+1" splitting of the Bianchi identities, which are rewritten
here as a "b... | [
{
"created": "Fri, 17 Aug 2018 11:18:31 GMT",
"version": "v1"
}
] | 2018-08-20 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
]
] | The definition of Simon tensor, originally given only in the Kerr spacetime and associated with the static family of observers, is generalized to any spacetime and to any possible observer family. Such generalization is obtained by a standard "3+1" splitting of the Bianchi identities, which are rewritten here as a "bal... |
2202.12060 | Shinya Tomizawa | Takashi Mishima, Shinya Tomizawa | Conversion of gravitational and electromagnetic waves without any
external background fields | 10 pages, 8 figures | null | 10.1007/s10714-023-03117-4 | TTI-MATHPHYS-10 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Applying a simple harmonic map method to the cylindrically symmetric
Einstein-Maxwell system, we obtain exact solutions representing strong
nonlinear interaction between gravitational waves and electromagnetic waves in
the case without any background field. As an interesting fact, we can show that
with adjusted param... | [
{
"created": "Thu, 24 Feb 2022 12:31:30 GMT",
"version": "v1"
}
] | 2023-05-31 | [
[
"Mishima",
"Takashi",
""
],
[
"Tomizawa",
"Shinya",
""
]
] | Applying a simple harmonic map method to the cylindrically symmetric Einstein-Maxwell system, we obtain exact solutions representing strong nonlinear interaction between gravitational waves and electromagnetic waves in the case without any background field. As an interesting fact, we can show that with adjusted paramet... |
1311.4251 | Shao-Wen Wei | Shao-Wen Wei and Yu-Xiao Liu | Observing the shadow of Einstein-Maxwell-Dilaton-Axion black hole | 16 pages, 7 figures, and 2 tables. arXiv admin note: text overlap
with arXiv:1112.6349 by other authors | JCAP 11, 063 (2013) | 10.1088/1475-7516/2013/11/063 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the shadows cast by Einstein-Maxwell-Dilaton-Axion black hole
and naked singularity are studied. The shadow of a rotating black hole is found
to be a dark zone covered by a deformed circle. For a fixed value of the spin
$a$, the size of the shadow decreases with the dilaton parameter $b$. The
distortio... | [
{
"created": "Mon, 18 Nov 2013 03:11:21 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Dec 2013 06:18:16 GMT",
"version": "v2"
}
] | 2013-12-03 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | In this paper, the shadows cast by Einstein-Maxwell-Dilaton-Axion black hole and naked singularity are studied. The shadow of a rotating black hole is found to be a dark zone covered by a deformed circle. For a fixed value of the spin $a$, the size of the shadow decreases with the dilaton parameter $b$. The distortion ... |
1702.05517 | Salvatore Capozziello | Salvatore Capozziello, Mariafelicia De Laurentis, Shin'ichi Nojiri,
and Sergei D. Odintsov | The evolution of gravitons in accelerating cosmologies: the case of
extended gravity | 15 pages, to be published in Physical Review D | Phys. Rev. D 95, 083524 (2017) | 10.1103/PhysRevD.95.083524 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the production and evolution of cosmological gravitons showing how
the cosmological background affects their dynamics. Besides, the detection of
cosmological gravitons could constitute an extremely important signature to
discriminate among different cosmological models. Here we consider the cases of
scalar... | [
{
"created": "Fri, 17 Feb 2017 21:07:45 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Apr 2017 18:00:43 GMT",
"version": "v2"
}
] | 2017-05-03 | [
[
"Capozziello",
"Salvatore",
""
],
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei D.",
""
]
] | We discuss the production and evolution of cosmological gravitons showing how the cosmological background affects their dynamics. Besides, the detection of cosmological gravitons could constitute an extremely important signature to discriminate among different cosmological models. Here we consider the cases of scalar-t... |
gr-qc/9410031 | Kalyana Rama | S. Kalyana Rama and Siddhartha Sen | Inconsistent Physics in the Presence of Time Machines | preprint MRI-PHY/14/94, TCD-7-94; 19 pages. Contains six figures, not
included in the latex file, but available upon request from the first author | null | null | null | gr-qc hep-th | null | We present a scenario in $1 + 1$ and $3 + 1$ dimensional space time which is
paradoxical in the presence of a time machine. We show that the paradox cannot
be resolved and the scenario has {\em no} consistent classical solution. Since
the system is macroscopic, quantisation is unlikely to resolve the paradox.
Moreove... | [
{
"created": "Sat, 22 Oct 1994 14:19:41 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Rama",
"S. Kalyana",
""
],
[
"Sen",
"Siddhartha",
""
]
] | We present a scenario in $1 + 1$ and $3 + 1$ dimensional space time which is paradoxical in the presence of a time machine. We show that the paradox cannot be resolved and the scenario has {\em no} consistent classical solution. Since the system is macroscopic, quantisation is unlikely to resolve the paradox. Moreover,... |
gr-qc/0212046 | Fernando P. Devecchi | G.M. Kremer and F.P. Devecchi | Viscous cosmological models and accelerated Universes | 7 pages, latex file, 1 figure. To appear in PRD | Phys.Rev. D67 (2003) 047301 | 10.1103/PhysRevD.67.047301 | null | gr-qc | null | It is shown that a present acceleration with a past deceleration is a
possible solution of the Friedmann equation by considering the Universe as a
mixture of a scalar with a matter field and by including a non-equilibrium
pressure term in the energy-momentum tensor. The dark energy density decays
more slowly with res... | [
{
"created": "Wed, 11 Dec 2002 10:48:10 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Dec 2002 14:47:02 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Kremer",
"G. M.",
""
],
[
"Devecchi",
"F. P.",
""
]
] | It is shown that a present acceleration with a past deceleration is a possible solution of the Friedmann equation by considering the Universe as a mixture of a scalar with a matter field and by including a non-equilibrium pressure term in the energy-momentum tensor. The dark energy density decays more slowly with respe... |
gr-qc/0301092 | Lee Samuel Finn | Lee Samuel Finn | No statistical excess in Explorer/Nautilus observations in the year 2001 | 11 pages, 3 figures, to appear in CQG | Class.Quant.Grav. 20 (2003) L37 | 10.1088/0264-9381/20/4/103 | null | gr-qc astro-ph | null | A recent report on gravitational wave detector data from the NAUTILUS and
EXPLORER detector groups claims a statistically significant excess of
coincident events when the detectors are oriented in a way that maximizes their
sensitivity to gravitational wave sources in the galactic plane. While not
claiming a detectio... | [
{
"created": "Thu, 23 Jan 2003 01:29:11 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Finn",
"Lee Samuel",
""
]
] | A recent report on gravitational wave detector data from the NAUTILUS and EXPLORER detector groups claims a statistically significant excess of coincident events when the detectors are oriented in a way that maximizes their sensitivity to gravitational wave sources in the galactic plane. While not claiming a detection ... |
gr-qc/0307086 | Valerio Faraoni | Valerio Faraoni | Big smash of the universe | 13 pages, LaTeX, no figures. To appear in Phys. Rev. D | Phys.Rev. D68 (2003) 063508 | 10.1103/PhysRevD.68.063508 | null | gr-qc astro-ph | null | The occurrence of a big smash singularity which ends the universe in a finite
time in the future is investigated in the context of superquintessence, i.e.
dark energy with effective equation of state parameter w<-1. The simplest model
of superquintessence based on a single nonminimally coupled scalar field
exhibits b... | [
{
"created": "Fri, 18 Jul 2003 16:05:49 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Faraoni",
"Valerio",
""
]
] | The occurrence of a big smash singularity which ends the universe in a finite time in the future is investigated in the context of superquintessence, i.e. dark energy with effective equation of state parameter w<-1. The simplest model of superquintessence based on a single nonminimally coupled scalar field exhibits big... |
1310.1663 | Masato Nozawa | Masato Nozawa and Tetsuya Shiromizu | Modeling scalar fields consistent with positive mass | 8 pages. v2: minor modifications, to appear in PRD | Phys. Rev. D 89, 023011 (2014) | 10.1103/PhysRevD.89.023011 | KEK-TH-1674 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper explores the conditions under which modified gravitational
theories admit the positive mass. Following Witten's spinor argument, it is
argued that a single condition should be imposed upon a gauge connection in the
super-covariant derivative. Under this condition, we present a simple formula
for the diverg... | [
{
"created": "Mon, 7 Oct 2013 03:01:47 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jan 2014 09:58:59 GMT",
"version": "v2"
}
] | 2014-03-11 | [
[
"Nozawa",
"Masato",
""
],
[
"Shiromizu",
"Tetsuya",
""
]
] | This paper explores the conditions under which modified gravitational theories admit the positive mass. Following Witten's spinor argument, it is argued that a single condition should be imposed upon a gauge connection in the super-covariant derivative. Under this condition, we present a simple formula for the divergen... |
2310.19269 | Jaros{\l}aw Kopi\'nski | A. Rod Gover, Jaros{\l}aw Kopi\'nski, Andrew Waldron | Stress and Geometry for Isotropic Singularities | 6 pages, LaTeX, minor corrections | Phys. Rev. Lett. 133, 011401 2024 | 10.1103/PhysRevLett.133.011401 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We develop the mathematics needed to treat the interaction of geometry and
stress at any isotropic spacetime singularity. This enables us to handle the
Einstein equations at the initial singularity and characterize allowed general
relativistic stress-energy tensors. Their leading behaviors are dictated by an
initial ... | [
{
"created": "Mon, 30 Oct 2023 05:05:39 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jul 2024 14:46:19 GMT",
"version": "v2"
}
] | 2024-07-04 | [
[
"Gover",
"A. Rod",
""
],
[
"Kopiński",
"Jarosław",
""
],
[
"Waldron",
"Andrew",
""
]
] | We develop the mathematics needed to treat the interaction of geometry and stress at any isotropic spacetime singularity. This enables us to handle the Einstein equations at the initial singularity and characterize allowed general relativistic stress-energy tensors. Their leading behaviors are dictated by an initial hy... |
2402.14190 | Reggie Pantig | Ali \"Ovg\"un, Reggie C. Pantig, \'Angel Rinc\'on | Shadow and greybody bounding of a regular scale-dependent black hole
solution | 21 pages, 8 figures | Annals of Physics 463 (2024) 169625 | 10.1016/j.aop.2024.169625 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this manuscript, we explore the shadow and the greybody bounding
characteristics of a regular black hole within 4-dimensional space-time,
employing the context of gravity that is scale-dependent. Our focus lies in
determining limitations on the parameter denoted as $\tilde{\epsilon}$, which
serves as a descriptor ... | [
{
"created": "Thu, 22 Feb 2024 00:30:46 GMT",
"version": "v1"
}
] | 2024-02-23 | [
[
"Övgün",
"Ali",
""
],
[
"Pantig",
"Reggie C.",
""
],
[
"Rincón",
"Ángel",
""
]
] | In this manuscript, we explore the shadow and the greybody bounding characteristics of a regular black hole within 4-dimensional space-time, employing the context of gravity that is scale-dependent. Our focus lies in determining limitations on the parameter denoted as $\tilde{\epsilon}$, which serves as a descriptor fo... |
1608.06764 | Farhad Darabi | M. R. Setare, F. Felegary, F. Darabi | Evolution of spherical overdensities in new agegraphic dark energy model | 9 pages, 15 figures | Int.J.Mod.Phys D, 26 (2017) 1750101 | 10.1142/S0218271817501012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the structure formation by investigating the spherical collapse
model in the context of new agegraphic dark energy model in flat FRW cosmology.
We compute the perturbational quantities $g(a)$, $\delta_{c}(z_{c})$,
$\lambda(z_{c})$, $\xi(z_{c})$, $\Delta_{vir}(z_{c})$, $\log[\nu f(\nu)]$ and
$\log[n(k)]$ for ... | [
{
"created": "Wed, 24 Aug 2016 09:41:03 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2017 12:28:36 GMT",
"version": "v2"
}
] | 2017-07-05 | [
[
"Setare",
"M. R.",
""
],
[
"Felegary",
"F.",
""
],
[
"Darabi",
"F.",
""
]
] | We study the structure formation by investigating the spherical collapse model in the context of new agegraphic dark energy model in flat FRW cosmology. We compute the perturbational quantities $g(a)$, $\delta_{c}(z_{c})$, $\lambda(z_{c})$, $\xi(z_{c})$, $\Delta_{vir}(z_{c})$, $\log[\nu f(\nu)]$ and $\log[n(k)]$ for th... |
gr-qc/0701090 | Joan Sola | Javier Grande, Joan Sola, Hrvoje Stefancic | Cosmologies with variable parameters and dynamical cosmon: implications
on the cosmic coincidence problem | LaTeX, 13 pages, 5 figures | J.Phys.A40:6787-6799,2007 | 10.1088/1751-8113/40/25/S23 | UB-ECM-PF-06/44 | gr-qc astro-ph hep-ph hep-th | null | Dynamical dark energy (DE) has been proposed to explain various aspects of
the cosmological constant (CC) problem(s). For example, it is very difficult to
accept that a strictly constant Lambda-term constitutes the ultimate
explanation for the DE in our Universe. It is also hard to acquiesce in the
idea that we accid... | [
{
"created": "Tue, 16 Jan 2007 08:31:52 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Grande",
"Javier",
""
],
[
"Sola",
"Joan",
""
],
[
"Stefancic",
"Hrvoje",
""
]
] | Dynamical dark energy (DE) has been proposed to explain various aspects of the cosmological constant (CC) problem(s). For example, it is very difficult to accept that a strictly constant Lambda-term constitutes the ultimate explanation for the DE in our Universe. It is also hard to acquiesce in the idea that we acciden... |
2209.13396 | J. W. van Holten | Jan .W. van Holten | The gravity of light | Contribution to the Heraeus Seminar on Experimental Tests and
Signatures of Modified and Quantum Gravity, Febr. 2021 | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The gravitational field of an idealized plane-wave solution of the Maxwell
equations can be described in closed form. After discussing this particular
solution of the Einstein-Maxwell equations, the motion of neutral test
particles, which are sensitive only to the gravitational background field, is
analyzed. This is ... | [
{
"created": "Tue, 27 Sep 2022 14:00:15 GMT",
"version": "v1"
}
] | 2022-09-28 | [
[
"van Holten",
"Jan . W.",
""
]
] | The gravitational field of an idealized plane-wave solution of the Maxwell equations can be described in closed form. After discussing this particular solution of the Einstein-Maxwell equations, the motion of neutral test particles, which are sensitive only to the gravitational background field, is analyzed. This is fo... |
0705.0019 | Alexander Petrov Nikolaevich | A.N.Petrov | Nonlinear Perturbations and Conservation Laws on Curved Backgrounds in
GR and Other Metric Theories | 81 pages, LaTeX, 5 figures | The Chapter 2 in the book: "Classical and Quantum Gravity
Research", Eds: M.N. Christiansen and T.K. Rasmussen (Nova Science
Publishers, N.Y., 2008), p.p. 79 - 160 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The field-theoretical approach is reviewed. Perturbations in general
relativity as well as in an arbitrary $D$-dimensional metric theory are studied
on a background, which is a solution (arbitrary) of the theory. Lagrangian for
perturbations is defined, and field equations for perturbations are derived
from the varia... | [
{
"created": "Mon, 30 Apr 2007 20:53:41 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Oct 2008 10:30:35 GMT",
"version": "v2"
}
] | 2008-10-16 | [
[
"Petrov",
"A. N.",
""
]
] | The field-theoretical approach is reviewed. Perturbations in general relativity as well as in an arbitrary $D$-dimensional metric theory are studied on a background, which is a solution (arbitrary) of the theory. Lagrangian for perturbations is defined, and field equations for perturbations are derived from the variati... |
gr-qc/0009105 | Volker Perlick | Volker Perlick | Global properties of gravitational lens maps in a Lorentzian manifold
setting | 26 pages | Commun.Math.Phys. 220 (2001) 403-428 | 10.1007/s002200100450 | AEI-2000-059 | gr-qc | null | In a general-relativistic spacetime (Lorentzian manifold), gravitational
lensing can be characterized by a lens map, in analogy to the lens map of the
quasi-Newtonian approximation formalism. The lens map is defined on the
celestial sphere of the observer (or on part of it) and it takes values in a
two-dimensional ma... | [
{
"created": "Fri, 29 Sep 2000 19:34:48 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Perlick",
"Volker",
""
]
] | In a general-relativistic spacetime (Lorentzian manifold), gravitational lensing can be characterized by a lens map, in analogy to the lens map of the quasi-Newtonian approximation formalism. The lens map is defined on the celestial sphere of the observer (or on part of it) and it takes values in a two-dimensional mani... |
1205.1542 | Vladimir Popov | Anna Mokeeva and Vladimir Popov | Nonsingular Chaplygin gas cosmologies in universes connected by wormhole | 14 pages, 9 figures | Gravitation and Cosmology, 19, 57, 2013 | 10.1134/S0202289313010076 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present some exact solutions of the Einstein equations with an anisotropic
fluid exploiting the Chaplygin equation of state. The solutions describe
spacetimes with two identical T regions and an intermediate static spherically
symmetric R region containing a wormhole. The metric in the T region represents
an aniso... | [
{
"created": "Mon, 7 May 2012 20:55:21 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Apr 2013 08:37:07 GMT",
"version": "v2"
}
] | 2013-04-23 | [
[
"Mokeeva",
"Anna",
""
],
[
"Popov",
"Vladimir",
""
]
] | We present some exact solutions of the Einstein equations with an anisotropic fluid exploiting the Chaplygin equation of state. The solutions describe spacetimes with two identical T regions and an intermediate static spherically symmetric R region containing a wormhole. The metric in the T region represents an anisotr... |
1509.09233 | Felipe Asenjo | Felipe A. Asenjo and Sergio A. Hojman | Class of exact solutions for a cosmological model of unified
gravitational and quintessence fields | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new approach to tackle Einstein equations for an isotropic and homogeneous
Friedmann--Robertson--Walker Universe in the presence of a quintessence scalar
field is devised. It provides a way to get a simple exact solution to these
equations. This solution determines the quintessence potential uniquely and it
differs... | [
{
"created": "Wed, 30 Sep 2015 15:55:30 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2016 12:40:06 GMT",
"version": "v2"
}
] | 2016-04-12 | [
[
"Asenjo",
"Felipe A.",
""
],
[
"Hojman",
"Sergio A.",
""
]
] | A new approach to tackle Einstein equations for an isotropic and homogeneous Friedmann--Robertson--Walker Universe in the presence of a quintessence scalar field is devised. It provides a way to get a simple exact solution to these equations. This solution determines the quintessence potential uniquely and it differs f... |
1701.07670 | Arthur Scardua | Nelson Pinto-Neto and Arthur Scardua | On the detection of primordial gravitational waves produced in bouncing
models | 22 pages, 9 figures | Phys. Rev. D 95, 123522 (2017) | 10.1103/PhysRevD.95.123522 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is widely known that bouncing models with a dust hydrodynamical fluid
satisfying ${c_s^2=p_d/\rho_d\approx 0}$, where $c_s, p_d, \rho_d$ are the
sound velocity, pressure and energy density of the dust fluid, respectively,
have almost scale invariant spectrum of scalar perturbations and negligible
primordial gravit... | [
{
"created": "Thu, 26 Jan 2017 12:24:42 GMT",
"version": "v1"
}
] | 2017-06-21 | [
[
"Pinto-Neto",
"Nelson",
""
],
[
"Scardua",
"Arthur",
""
]
] | It is widely known that bouncing models with a dust hydrodynamical fluid satisfying ${c_s^2=p_d/\rho_d\approx 0}$, where $c_s, p_d, \rho_d$ are the sound velocity, pressure and energy density of the dust fluid, respectively, have almost scale invariant spectrum of scalar perturbations and negligible primordial gravitat... |
1203.0452 | Kentaro Tanabe | Kentaro Tanabe, Tetsuya Shiromizu, Shunichiro Kinoshita | Angular momentum at null infinity in higher dimensions | 13 pages | null | 10.1103/PhysRevD.85.124058 | YITP-12-13 | gr-qc hep-th | http://creativecommons.org/licenses/publicdomain/ | We define the angular momentum at null infinity in higher dimensions. The
asymptotic symmetry at null infinity becomes the Poincare group in higher
dimensions. This fact implies that the angular momentum can be defined without
any ambiguities such as supertranslation in four dimensions. Indeed we can show
that the an... | [
{
"created": "Fri, 2 Mar 2012 13:10:11 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Tanabe",
"Kentaro",
""
],
[
"Shiromizu",
"Tetsuya",
""
],
[
"Kinoshita",
"Shunichiro",
""
]
] | We define the angular momentum at null infinity in higher dimensions. The asymptotic symmetry at null infinity becomes the Poincare group in higher dimensions. This fact implies that the angular momentum can be defined without any ambiguities such as supertranslation in four dimensions. Indeed we can show that the angu... |
1603.08694 | Shao-Wen Wei | Peng Cheng, Shao-Wen Wei, Yu-Xiao Liu | Critical phenomena in the extended phase space of Kerr-Newman-AdS black
holes | 13 pages, 6 figures, and 1 table | Phys. Rev. D 94, 024025 (2016) | 10.1103/PhysRevD.94.024025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Treating the cosmological constant as a thermodynamic pressure, we
investigate the critical behavior of a Kerr-Newman-AdS black hole system. The
critical points for the van der Waals like phase transition are numerically
solved. The highly accurate fitting formula for them is given and is found to
be dependent of the... | [
{
"created": "Tue, 29 Mar 2016 09:31:19 GMT",
"version": "v1"
}
] | 2016-07-20 | [
[
"Cheng",
"Peng",
""
],
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | Treating the cosmological constant as a thermodynamic pressure, we investigate the critical behavior of a Kerr-Newman-AdS black hole system. The critical points for the van der Waals like phase transition are numerically solved. The highly accurate fitting formula for them is given and is found to be dependent of the c... |
1512.09275 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou | Mimetic $F(R)$ inflation confronted with Planck and BICEP2/Keck Array
data | null | null | 10.1007/s10509-016-2761-9 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we demonstrate that in the context of mimetic $F(R)$ gravity
with Lagrange multiplier, it is possible to realize cosmologies which are
compatible with the recent BICEP2/Keck Array data. We provide some
characteristic examples for which the predicted scalar to tensor ratio can be
quite smaller in compari... | [
{
"created": "Thu, 31 Dec 2015 13:05:11 GMT",
"version": "v1"
}
] | 2016-05-25 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | In this paper we demonstrate that in the context of mimetic $F(R)$ gravity with Lagrange multiplier, it is possible to realize cosmologies which are compatible with the recent BICEP2/Keck Array data. We provide some characteristic examples for which the predicted scalar to tensor ratio can be quite smaller in compariso... |
2102.01660 | Rodrigo Maier | Rafael F. Aranha, Carlos E. Cede\~no M., Rodrigo Maier, Ivano Dami\~ao
Soares | Maxwell Fields in Boosted Kerr Black Holes | null | null | 10.1103/PhysRevD.103.064060 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spacetime of a boosted Bondi-Sachs rotating black hole is considered as a
proper background to examine electromagnetic configurations connected to
analytic solutions of Maxwell equations. In our analysis, we first use the
Bondi-Sachs transformations in order to bring the boosted rotating black hole
metric into th... | [
{
"created": "Tue, 2 Feb 2021 18:22:44 GMT",
"version": "v1"
}
] | 2021-04-07 | [
[
"Aranha",
"Rafael F.",
""
],
[
"M.",
"Carlos E. Cedeño",
""
],
[
"Maier",
"Rodrigo",
""
],
[
"Soares",
"Ivano Damião",
""
]
] | The spacetime of a boosted Bondi-Sachs rotating black hole is considered as a proper background to examine electromagnetic configurations connected to analytic solutions of Maxwell equations. In our analysis, we first use the Bondi-Sachs transformations in order to bring the boosted rotating black hole metric into the ... |
1307.5018 | Jose M. M. Senovilla | Marc Mars and Jos\'e M. M. Senovilla | A spacetime characterization of the Kerr-NUT-(A)de Sitter and related
metrics | 43 pages. No figures. v2: Statement of main theorem added in the
Introduction. Section 4 divided into subsections. Minor additional changes.
v3: Theorems 1 and 6 corrected to include a hypothesis that was not made
explicit in version v1 and v2 and in the published paper. Relevant changes
are highlighted in blue... | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A characterization of the Kerr-NUT-(A)de Sitter metric among four dimensional
\Lambda-vacuum spacetimes admitting a Killing vector is obtained in terms of
the proportionality of the self-dual Weyl tensor and a natural self-dual double
two-form constructed from the Killing vector. This result recovers and extends
a pr... | [
{
"created": "Thu, 18 Jul 2013 17:21:17 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Apr 2014 16:57:30 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Dec 2016 12:03:20 GMT",
"version": "v3"
}
] | 2016-12-20 | [
[
"Mars",
"Marc",
""
],
[
"Senovilla",
"José M. M.",
""
]
] | A characterization of the Kerr-NUT-(A)de Sitter metric among four dimensional \Lambda-vacuum spacetimes admitting a Killing vector is obtained in terms of the proportionality of the self-dual Weyl tensor and a natural self-dual double two-form constructed from the Killing vector. This result recovers and extends a prev... |
1601.06618 | Yuri Pavlov | A. A. Grib, Yu. V. Pavlov | Particle creation in the early Universe: achievements and problems | 9 pages, 3 figures | Gravitation and Cosmology 22 (2016) 107-115 | 10.1134/S0202289316020067 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Results on particle creation from vacuum by the gravitational field of the
expanding Friedmann Universe are presented. Finite results for the density of
particles and the energy density for created particles are given for different
exact solutions for different regimes of the expansion of the Universe. The
results ar... | [
{
"created": "Mon, 25 Jan 2016 14:32:55 GMT",
"version": "v1"
}
] | 2016-11-02 | [
[
"Grib",
"A. A.",
""
],
[
"Pavlov",
"Yu. V.",
""
]
] | Results on particle creation from vacuum by the gravitational field of the expanding Friedmann Universe are presented. Finite results for the density of particles and the energy density for created particles are given for different exact solutions for different regimes of the expansion of the Universe. The results are ... |
0906.0569 | Kristina Giesel | K. Giesel, J. Tambornino, T. Thiemann | LTB spacetimes in terms of Dirac observables | 29 pages, no figures | Class.Quant.Grav.27:105013,2010 | 10.1088/0264-9381/27/10/105013 | AEI-2009-053 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The construction of Dirac observables, that is gauge invariant objects, in
General Relativity is technically more complicated than in other gauge theories
such as the standard model due to its more complicated gauge group which is
closely related to the group of spacetime diffeomorphisms. However, the
explicit and us... | [
{
"created": "Tue, 2 Jun 2009 19:44:42 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Giesel",
"K.",
""
],
[
"Tambornino",
"J.",
""
],
[
"Thiemann",
"T.",
""
]
] | The construction of Dirac observables, that is gauge invariant objects, in General Relativity is technically more complicated than in other gauge theories such as the standard model due to its more complicated gauge group which is closely related to the group of spacetime diffeomorphisms. However, the explicit and usua... |
gr-qc/0506063 | Carl H. Brans | Carl H. Brans | The roots of scalar-tensor theory: an approximate history | null | null | null | null | gr-qc | null | Why are there no fundamental scalar fields actually observed in physics
today? Scalars are the simplest fields, but once we go beyond
Galilean-Newtonian physics they appear only in speculations, as possible
determinants of the gravitational constants in the so-called Scalar-Tensor
theories in non-quantum physics, and... | [
{
"created": "Fri, 10 Jun 2005 16:47:36 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Brans",
"Carl H.",
""
]
] | Why are there no fundamental scalar fields actually observed in physics today? Scalars are the simplest fields, but once we go beyond Galilean-Newtonian physics they appear only in speculations, as possible determinants of the gravitational constants in the so-called Scalar-Tensor theories in non-quantum physics, and a... |
0911.3333 | Kourosh Nozari | Kourosh Nozari and Tahereh Azizi | Phantom-like effects in asymmetric brane embedding with induced gravity
and the Gauss-Bonnet term in the Bulk | 21 pages, 2 figures, new references added | Phys.Scripta 83:015001,2011 | 10.1088/0031-8949/83/01/015001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct an asymmetric braneworld embedding with induced gravity on the
brane, where stringy effects are taken into account by incorporation of the
Gauss-Bonnet term in the bulk action. We derive the effective Friedmann
equation of the brane and then we investigate the possible realization of the
phantom-like beh... | [
{
"created": "Tue, 17 Nov 2009 15:34:30 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Nov 2009 11:55:30 GMT",
"version": "v2"
}
] | 2010-12-09 | [
[
"Nozari",
"Kourosh",
""
],
[
"Azizi",
"Tahereh",
""
]
] | We construct an asymmetric braneworld embedding with induced gravity on the brane, where stringy effects are taken into account by incorporation of the Gauss-Bonnet term in the bulk action. We derive the effective Friedmann equation of the brane and then we investigate the possible realization of the phantom-like behav... |
2207.08833 | Hong Lu | H. Khodabakhshi, H. Lu and Run-Qiu Yang | Tightening the Penrose Inequality | latex, 20 pages, typos corrected, references added and comments on
the upper and lower bounds on black hole entropy added. To appear in SCPMA | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Penrose inequality estimates the lower bound of the mass of a black hole
in terms of the area of its horizon. This bound is relatively loose for
extremal or near extremal black holes. We propose a new Penrose-like inequality
for static black holes involving the mass, area of the black hole event horizon
and tempe... | [
{
"created": "Mon, 18 Jul 2022 18:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Oct 2022 05:49:58 GMT",
"version": "v2"
}
] | 2022-10-21 | [
[
"Khodabakhshi",
"H.",
""
],
[
"Lu",
"H.",
""
],
[
"Yang",
"Run-Qiu",
""
]
] | The Penrose inequality estimates the lower bound of the mass of a black hole in terms of the area of its horizon. This bound is relatively loose for extremal or near extremal black holes. We propose a new Penrose-like inequality for static black holes involving the mass, area of the black hole event horizon and tempera... |
1306.3074 | Thomas-Paul Hack | Thomas-Paul Hack | The Lambda CDM-model in quantum field theory on curved spacetime and
Dark Radiation | 17 pages, 4 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the standard model of cosmology, the universe is described by a
Robertson-Walker spacetime, while its matter/energy content is modeled by a
perfect fluid with three components corresponding to matter/dust, radiation and
a cosmological constant. On the other hand, in particle physics matter and
radiation are descri... | [
{
"created": "Thu, 13 Jun 2013 10:58:27 GMT",
"version": "v1"
}
] | 2013-06-14 | [
[
"Hack",
"Thomas-Paul",
""
]
] | In the standard model of cosmology, the universe is described by a Robertson-Walker spacetime, while its matter/energy content is modeled by a perfect fluid with three components corresponding to matter/dust, radiation and a cosmological constant. On the other hand, in particle physics matter and radiation are describe... |
1511.00720 | S Habib Mazharimousavi | S. Habib Mazharimousavi and M. Halilsoy | Hypocycloidal throat for 2+1-dimensional thin-shell wormholes | 5 pages, 3 figures accepted for publication in EPJC | Eur. Phys. J. C 75, 540 (2015) | 10.1140/epjc/s10052-015-3770-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently we have shown that for $2+1-$dimensional thin-shell wormholes a
non-circular throat may lead to a physical wormhole in the sense that the
energy conditions are satisfied. By the same token, herein we consider angular
dependent throat geometry embedded in a $2+1-$dimensional flat spacetime in
polar coordinate... | [
{
"created": "Fri, 23 Oct 2015 12:29:11 GMT",
"version": "v1"
}
] | 2016-01-29 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
]
] | Recently we have shown that for $2+1-$dimensional thin-shell wormholes a non-circular throat may lead to a physical wormhole in the sense that the energy conditions are satisfied. By the same token, herein we consider angular dependent throat geometry embedded in a $2+1-$dimensional flat spacetime in polar coordinates.... |
gr-qc/9310013 | Thomas Thiemann | T. Thiemann | On the solution of the initial value constraints for general relativity
coupled to matter in terms of Ashtekar's variables | Latex, 15 pages, PITHA93-1, January 93 | Class.Quant.Grav.10:1907-1921,1993 | 10.1088/0264-9381/10/9/028 | null | gr-qc | null | The method of solution of the initial value constraints for pure canonical
gravity in terms of Ashtekar's new canonical variables due to CDJ is further
developed in the present paper. There are 2 new main results : 1) We extend the
method of CDJ to arbitrary matter-coupling again for non-degenerate metrics :
the new ... | [
{
"created": "Thu, 7 Oct 1993 02:08:34 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Thiemann",
"T.",
""
]
] | The method of solution of the initial value constraints for pure canonical gravity in terms of Ashtekar's new canonical variables due to CDJ is further developed in the present paper. There are 2 new main results : 1) We extend the method of CDJ to arbitrary matter-coupling again for non-degenerate metrics : the new fe... |
2407.15178 | Mrinnoy Gohain | Rajdeep Mazumdar, Mrinnoy M. Gohain and Kalyan Bhuyan | Cosmological Bounce Scenario with a Novel Parametrization of Bulk
Viscosity | 8 figures, 2 tables, Accepted for publication in Int. J. Geom.
Methods. Mod. Phys. arXiv admin note: text overlap with arXiv:2208.03171 by
other authors | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we have studied how incorporating viscous fluids leads to exact
bounce cosmological solutions in general relativity (GR) framework.
Specifically, we propose a novel parameterization of bulk viscosity coefficient
of the form $\zeta = \zeta_0 (t-t_0)^{-2n} H$, where $\zeta_0$, $n$ being some
positive cons... | [
{
"created": "Sun, 21 Jul 2024 14:29:29 GMT",
"version": "v1"
}
] | 2024-07-23 | [
[
"Mazumdar",
"Rajdeep",
""
],
[
"Gohain",
"Mrinnoy M.",
""
],
[
"Bhuyan",
"Kalyan",
""
]
] | In this work, we have studied how incorporating viscous fluids leads to exact bounce cosmological solutions in general relativity (GR) framework. Specifically, we propose a novel parameterization of bulk viscosity coefficient of the form $\zeta = \zeta_0 (t-t_0)^{-2n} H$, where $\zeta_0$, $n$ being some positive consta... |
1606.08031 | Aurelien Barrau | Aur\'elien Barrau, Boris Bolliet, Marrit Schutten, Francesca Vidotto | Bouncing black holes in quantum gravity and the Fermi gamma-ray excess | 6 pages, 3 figures | null | 10.1016/j.physletb.2017.05.040 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-perturbative quantum-gravity effects can change the fate of black holes
and make them bounce in a time scale shorter than the Hawking evaporation time.
In this article, we show that this hypothesis can account for the GeV excess
observed from the galactic center by the Fermi satellite. By carefully taking
into ac... | [
{
"created": "Sun, 26 Jun 2016 13:00:57 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jun 2017 07:17:55 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Barrau",
"Aurélien",
""
],
[
"Bolliet",
"Boris",
""
],
[
"Schutten",
"Marrit",
""
],
[
"Vidotto",
"Francesca",
""
]
] | Non-perturbative quantum-gravity effects can change the fate of black holes and make them bounce in a time scale shorter than the Hawking evaporation time. In this article, we show that this hypothesis can account for the GeV excess observed from the galactic center by the Fermi satellite. By carefully taking into acco... |
1808.09925 | Ramanath Cowsik PROF | Ramanath Cowsik, Dawson Huth, Maneesh Jeyakumar, Tsitsi
Madziwa-Nussinov, Michael Abercrombie, Adam Archibald, Nadathur Krishnan, and
Kasey Wagoner | Test of Einstein's Equivalence Principle by Galactic Dark Matter | I was carefully reviewing the data analysis procedure adopted in our
paper "Test of Einstein's Equivalence Principle by Galactic Dark Matter"
submitted on February 15, 2019. I have just noticed a subtle error in the
analysis. It is sufficiently serious that with great regret I am compelled to
withdraw the paper... | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report here the results of operation of a torsion balance with a period of
$\sim 1.27 \times 10^4$ s. The analysis of data collected over a period of
$\sim$115 days shows that the difference in the accelerations towards the
Galactic Center of test bodies made of aluminum and quartz was $(0.61 \pm 1.27)
\times 10^{... | [
{
"created": "Wed, 29 Aug 2018 16:55:20 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Oct 2018 17:10:23 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Oct 2018 19:00:25 GMT",
"version": "v3"
},
{
"created": "Fri, 15 Feb 2019 20:24:20 GMT",
"version": "v4"
},
{
"c... | 2019-06-19 | [
[
"Cowsik",
"Ramanath",
""
],
[
"Huth",
"Dawson",
""
],
[
"Jeyakumar",
"Maneesh",
""
],
[
"Madziwa-Nussinov",
"Tsitsi",
""
],
[
"Abercrombie",
"Michael",
""
],
[
"Archibald",
"Adam",
""
],
[
"Krishnan",
"Nadathur... | We report here the results of operation of a torsion balance with a period of $\sim 1.27 \times 10^4$ s. The analysis of data collected over a period of $\sim$115 days shows that the difference in the accelerations towards the Galactic Center of test bodies made of aluminum and quartz was $(0.61 \pm 1.27) \times 10^{-1... |
gr-qc/0311085 | Christos G. Tsagas | Christos G. Tsagas (AUT) | Magnetic tension and gravitational collapse | Typos corrected. Published version | Class.Quant.Grav. 23 (2006) 4323-4331 | 10.1088/0264-9381/23/13/002 | null | gr-qc astro-ph | null | The gravitational collapse of a magnetised medium is investigated by studying
qualitatively the convergence of a timelike family of non-geodesic worldlines
in the presence of a magnetic field. Focusing on the field's tension we
illustrate how the winding of the magnetic forcelines due to the fluid's
rotation assists ... | [
{
"created": "Thu, 27 Nov 2003 13:22:44 GMT",
"version": "v1"
},
{
"created": "Wed, 17 May 2006 17:22:38 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jul 2006 15:19:52 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Tsagas",
"Christos G.",
"",
"AUT"
]
] | The gravitational collapse of a magnetised medium is investigated by studying qualitatively the convergence of a timelike family of non-geodesic worldlines in the presence of a magnetic field. Focusing on the field's tension we illustrate how the winding of the magnetic forcelines due to the fluid's rotation assists th... |
2003.12082 | Wynn C. G. Ho | Wynn C. G. Ho (Haverford), D. I. Jones (Southampton), Nils Andersson
(Southampton), Cristobal M. Espinoza (Santiago de Chile) | Gravitational waves from transient neutron star f-mode oscillations | 6 pages, 5 figures; accepted for publication in Physical Review D | Phys. Rev. D 101, 103009 (2020) | 10.1103/PhysRevD.101.103009 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | During their most recent observing run, LIGO/Virgo reported the gravitational
wave (GW) transient S191110af, a burst signal at a frequency of 1.78 kHz that
lasted for 0.104 s. While this signal was later deemed non-astrophysical,
genuine detections of uncertain origin will occur in the future. Here we study
the poten... | [
{
"created": "Thu, 26 Mar 2020 18:02:13 GMT",
"version": "v1"
}
] | 2020-05-07 | [
[
"Ho",
"Wynn C. G.",
"",
"Haverford"
],
[
"Jones",
"D. I.",
"",
"Southampton"
],
[
"Andersson",
"Nils",
"",
"Southampton"
],
[
"Espinoza",
"Cristobal M.",
"",
"Santiago de Chile"
]
] | During their most recent observing run, LIGO/Virgo reported the gravitational wave (GW) transient S191110af, a burst signal at a frequency of 1.78 kHz that lasted for 0.104 s. While this signal was later deemed non-astrophysical, genuine detections of uncertain origin will occur in the future. Here we study the potenti... |
gr-qc/0405115 | Naresh Dadhich | Naresh Dadhich | Universality, Gravity, the enigmatic Lambda and Beyond | 13 pages | null | null | null | gr-qc astro-ph hep-th | null | In this essay, I wish to share a novel perspective which envisions
universalization as a guide from the classical world to relativistic and
quantum world. It is the incorporation of zero mass particle in mechanics which
leads to special relativity while its interaction with a universal field shared
by all particles l... | [
{
"created": "Fri, 21 May 2004 05:56:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Dadhich",
"Naresh",
""
]
] | In this essay, I wish to share a novel perspective which envisions universalization as a guide from the classical world to relativistic and quantum world. It is the incorporation of zero mass particle in mechanics which leads to special relativity while its interaction with a universal field shared by all particles lea... |
1401.6192 | Philippe G. LeFloch | Philippe G. LeFloch and Christina Sormani | The nonlinear stability of rotationally symmetric spaces with low
regularity | 38 pages | Journal of Functional Analysis, 268 (2015) no. 7 2005-2065 | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider rotationally symmetric spaces with low regularity, which we
regard as integral currents spaces or manifolds with Sobolev regularity and are
assumed to have nonnegative scalar curvature. Relying on the flat distance and
on Sobolev norms, we establish several nonlinear stability estimates about the
``distan... | [
{
"created": "Thu, 23 Jan 2014 21:18:48 GMT",
"version": "v1"
}
] | 2017-03-06 | [
[
"LeFloch",
"Philippe G.",
""
],
[
"Sormani",
"Christina",
""
]
] | We consider rotationally symmetric spaces with low regularity, which we regard as integral currents spaces or manifolds with Sobolev regularity and are assumed to have nonnegative scalar curvature. Relying on the flat distance and on Sobolev norms, we establish several nonlinear stability estimates about the ``distance... |
2405.15581 | Maxence Corman | Maxence Corman, Luis Lehner, William E. East, and Guillaume Dideron | Nonlinear studies of modifications to general relativity: Comparing
different approaches | 28 pages, 22 figures, replaced right panel figure 14 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Studying the dynamical, nonlinear regime of modified theories of gravity
remains a theoretical challenge that limits our ability to test general
relativity. Here we consider two generally applicable, but approximate methods
for treating modifications to full general relativity that have been used to
study binary blac... | [
{
"created": "Fri, 24 May 2024 14:10:36 GMT",
"version": "v1"
},
{
"created": "Mon, 27 May 2024 06:36:29 GMT",
"version": "v2"
}
] | 2024-05-28 | [
[
"Corman",
"Maxence",
""
],
[
"Lehner",
"Luis",
""
],
[
"East",
"William E.",
""
],
[
"Dideron",
"Guillaume",
""
]
] | Studying the dynamical, nonlinear regime of modified theories of gravity remains a theoretical challenge that limits our ability to test general relativity. Here we consider two generally applicable, but approximate methods for treating modifications to full general relativity that have been used to study binary black ... |
gr-qc/0307005 | Daniel Grumiller | D. Grumiller | Long time black hole evaporation with bounded Hawking flux | 34 pages, 6 figures, v2: included new references and 2 new footnotes;
v3: mayor revisions (extended intro, included pedagogical example, rearranged
presentation, extended discussion on information paradox, updated
references); v4: updated refs. (+ new ones), added comments, mostly on
dilaton evaporation, rewrot... | JCAP 0405 (2004) 005 | 10.1088/1475-7516/2004/05/005 | TU-03-16, LU-ITP 04/008, ESI 1461 | gr-qc astro-ph hep-th | null | The long time behavior of an evaporating Schwarzschild black hole is studied
exploiting that it can be described by an effective theory in 2D, a particular
dilaton gravity model.
A crucial technical ingredient is Izawa's result on consistent deformations
of 2D BF theory, while the most relevant physical assumption ... | [
{
"created": "Tue, 1 Jul 2003 16:01:47 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Sep 2003 10:50:53 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Feb 2004 11:36:59 GMT",
"version": "v3"
},
{
"created": "Wed, 28 Apr 2004 15:34:32 GMT",
"version": "v4"
}
] | 2009-11-10 | [
[
"Grumiller",
"D.",
""
]
] | The long time behavior of an evaporating Schwarzschild black hole is studied exploiting that it can be described by an effective theory in 2D, a particular dilaton gravity model. A crucial technical ingredient is Izawa's result on consistent deformations of 2D BF theory, while the most relevant physical assumption is b... |
gr-qc/0305068 | Jun'ichi Yokoyama | Jun'ichi Yokoyama | Issues on the cosmological constant | Proc. JGRG12 (12th workshop on general relativity and gravitation in
Japan) | null | null | null | gr-qc | null | Some issues of the cosmological constant or dark energy are briefly reviewed.
There are an increasing number of observations that constrain the equation of
state of dark energy more stringently and favor the time-independent
cosmological constant. Then a plausible model of dark energy would be a theory
with degenerat... | [
{
"created": "Mon, 19 May 2003 03:25:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Yokoyama",
"Jun'ichi",
""
]
] | Some issues of the cosmological constant or dark energy are briefly reviewed. There are an increasing number of observations that constrain the equation of state of dark energy more stringently and favor the time-independent cosmological constant. Then a plausible model of dark energy would be a theory with degenerate ... |
2010.09698 | Mustapha Azreg-A\"inou | Mustapha Azreg-A\"inou | On "Rotating charged AdS solutions in quadratic $f(T)$ gravity": New
rotating solutions | 5 twocolumn pages, to appear in the European Physical Journal C | Eur. Phys. J. C 80, 998 (2020) | 10.1140/epjc/s10052-020-08566-8 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that there are two or more procedures to generalize the known
four-dimensional transformation, aiming to generate cylindrically rotating
charged exact solutions, to higher dimensional spacetimes . In the one
procedure, presented in Eur. Phys. J. C (2019) \textbf{79}:668, one uses a
non-trivial, non-diagonal, ... | [
{
"created": "Mon, 19 Oct 2020 17:41:24 GMT",
"version": "v1"
}
] | 2020-10-30 | [
[
"Azreg-Aïnou",
"Mustapha",
""
]
] | We show that there are two or more procedures to generalize the known four-dimensional transformation, aiming to generate cylindrically rotating charged exact solutions, to higher dimensional spacetimes . In the one procedure, presented in Eur. Phys. J. C (2019) \textbf{79}:668, one uses a non-trivial, non-diagonal, Mi... |
gr-qc/0402087 | Piotr T. Chru\'sciel | Piotr T. Chrusciel | On analyticity of static vacuum metrics at non-degenerate horizons | latex2e, 9 pages in A4, minor wording improvements | Acta Phys.Polon. B36 (2005) 17-26 | null | null | gr-qc | null | We show that static metrics solving vacuum Einstein equations (possibly with
a cosmological constant) are one-sided analytic at non-degenerate Killing
horizons. We further prove analyticity in a two-sided neighborhood of
"bifurcate horizons".
It is a pleasure to dedicate this work to Prof. Staruszkiewicz, on the
oc... | [
{
"created": "Fri, 20 Feb 2004 14:05:32 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Sep 2004 11:37:51 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Chrusciel",
"Piotr T.",
""
]
] | We show that static metrics solving vacuum Einstein equations (possibly with a cosmological constant) are one-sided analytic at non-degenerate Killing horizons. We further prove analyticity in a two-sided neighborhood of "bifurcate horizons". It is a pleasure to dedicate this work to Prof. Staruszkiewicz, on the occasi... |
1110.6764 | Vladimir S. Manko | V. S. Manko and E. Ruiz | Singularities in the Kerr-Newman and charged $\delta=2$ Tomimatsu-Sato
spacetimes endowed with negative mass | 10 pages, 7 figures; hyperextreme case included, one reference added | Prog. Theor. Exper. Phys. 103E01, 2013 | 10.1093/ptep/ptt079 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Kerr-Newman solution with negative mass is shown to develop a massless
ring singularity off the symmetry axis. The singularity is located inside the
region with closed timelike curves which has topology of a torus and lies
outside the ergoregion. These characteristics are also shared by the charged
Tomimatsu-Sato... | [
{
"created": "Mon, 31 Oct 2011 12:16:00 GMT",
"version": "v1"
},
{
"created": "Fri, 31 May 2013 07:00:34 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Nov 2015 07:14:37 GMT",
"version": "v3"
}
] | 2015-11-06 | [
[
"Manko",
"V. S.",
""
],
[
"Ruiz",
"E.",
""
]
] | The Kerr-Newman solution with negative mass is shown to develop a massless ring singularity off the symmetry axis. The singularity is located inside the region with closed timelike curves which has topology of a torus and lies outside the ergoregion. These characteristics are also shared by the charged Tomimatsu-Sato d... |
1311.5298 | Shahar Hod | Shahar Hod | Stationary resonances of rapidly-rotating Kerr black holes | 6 pages | The European Physical Journal C 73, 2378 (2013) | 10.1140/epjc/s10052-013-2378-x | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Klein-Gordon equation for a massive scalar field in the background of a
rapidly-rotating Kerr black hole is studied analytically. In particular, we
derive a simple formula for the stationary (marginally-stable) resonances of
the field in the black-hole spacetime. The analytically derived formula is
shown to agree... | [
{
"created": "Thu, 21 Nov 2013 02:51:42 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Hod",
"Shahar",
""
]
] | The Klein-Gordon equation for a massive scalar field in the background of a rapidly-rotating Kerr black hole is studied analytically. In particular, we derive a simple formula for the stationary (marginally-stable) resonances of the field in the black-hole spacetime. The analytically derived formula is shown to agree w... |
gr-qc/0103112 | Robert Geroch | Robert Geroch | On Hyperbolic "Theories" of Relativistic Dissipative Fluids | 11 pages, 0 figures | null | null | null | gr-qc | null | It is argued that, at least for the case of Navier-Stokes fluids, the
so-called hyperbolic theories of dissipation are not viable.
| [
{
"created": "Fri, 30 Mar 2001 18:48:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Geroch",
"Robert",
""
]
] | It is argued that, at least for the case of Navier-Stokes fluids, the so-called hyperbolic theories of dissipation are not viable. |
2206.10136 | Tomislav Prokopec | Tomislav Prokopec | Gravitational wave signals in an Unruh-DeWitt detector | 23 pages, 6 figures, accepted for publication in Classical and
Quantum Gravity | null | 10.1088/1361-6382/acabf5 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We firstly generalize the massive scalar propagator for planar gravitational
waves propagating on Minkowski space obtained recently in Ref. [1]. We then use
this propagator to study the response of a freely falling Unruh-DeWitt detector
to a gravitational wave background. We find that a freely falling detector
comple... | [
{
"created": "Tue, 21 Jun 2022 06:42:40 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Dec 2022 17:06:42 GMT",
"version": "v2"
}
] | 2022-12-21 | [
[
"Prokopec",
"Tomislav",
""
]
] | We firstly generalize the massive scalar propagator for planar gravitational waves propagating on Minkowski space obtained recently in Ref. [1]. We then use this propagator to study the response of a freely falling Unruh-DeWitt detector to a gravitational wave background. We find that a freely falling detector complete... |
gr-qc/9402034 | Guillermo Mena | Guillermo A. Mena Marugan | Is the Exponential of the Chern-Simons Action a Normalizable Physical
State? | 13 pages (LATEX), Preprint CGPG-94/2-2 | Class.Quant.Grav.12:435-442,1995 | 10.1088/0264-9381/12/2/012 | null | gr-qc | null | We determine the wavefunction that corresponds to the exponential of the
Chern-Simons action in a family of gravitational models provided with
cosmological constant whose non-perturbative canonical quantization is
completely known. We show that this wavefunction does not represent a proper
quantum state, because it i... | [
{
"created": "Thu, 17 Feb 1994 19:33:56 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Marugan",
"Guillermo A. Mena",
""
]
] | We determine the wavefunction that corresponds to the exponential of the Chern-Simons action in a family of gravitational models provided with cosmological constant whose non-perturbative canonical quantization is completely known. We show that this wavefunction does not represent a proper quantum state, because it is ... |
2110.13672 | Miguel S\'anchez | Miguel S\'anchez | Globally hyperbolic spacetimes: slicings, boundaries and counterexamples | 51 pages, 9 figures. Final version with minor modifications to appear
in the Springer Topical Collection Singularity theorems, causality, and all
that (SCRI21) | Gen Relativ Gravit 54, 124 (2022) | 10.1007/s10714-022-03002-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Cauchy slicings for globally hyperbolic spacetimes and their relation
with the causal boundary are surveyed and revisited, starting at the seminal
conformal boundary constructions by R. Penrose. Our study covers: (1) adaptive
possibilities and techniques for their Cauchy slicings, (2) global
hyperbolicity of slic... | [
{
"created": "Tue, 26 Oct 2021 13:03:29 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Apr 2022 10:24:24 GMT",
"version": "v2"
},
{
"created": "Tue, 3 May 2022 18:42:24 GMT",
"version": "v3"
},
{
"created": "Fri, 16 Sep 2022 10:57:02 GMT",
"version": "v4"
}
] | 2023-02-06 | [
[
"Sánchez",
"Miguel",
""
]
] | The Cauchy slicings for globally hyperbolic spacetimes and their relation with the causal boundary are surveyed and revisited, starting at the seminal conformal boundary constructions by R. Penrose. Our study covers: (1) adaptive possibilities and techniques for their Cauchy slicings, (2) global hyperbolicity of sliced... |
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