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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1511.08583 | Kenji Tomita | Kenji Tomita | Fluctuations of the cosmic background radiation appearing in the
10-dimensional cosmological model | 23 pages, 2 figures | Prog. Theor. Exp. Phys. 2015, 123E01 (2015) | 10.1093/ptep/ptv172 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a cosmological model starting from (1) the(1+3+6)-dimensional
space-times consisting of the outer space (the 3-dimensional expanding section)
and the inner space (the 6-dimensional section) and reaching (2) the Friedmann
model after the decoupling between the outer space and the inner space, and
derive fl... | [
{
"created": "Fri, 27 Nov 2015 08:32:58 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Dec 2015 04:57:59 GMT",
"version": "v2"
}
] | 2015-12-24 | [
[
"Tomita",
"Kenji",
""
]
] | We consider a cosmological model starting from (1) the(1+3+6)-dimensional space-times consisting of the outer space (the 3-dimensional expanding section) and the inner space (the 6-dimensional section) and reaching (2) the Friedmann model after the decoupling between the outer space and the inner space, and derive fluc... |
gr-qc/0202104 | David Coule | D.H.Coule | Entropic issues in contemporary cosmology | brief discussion on Poincare recurrence included | Int.J.Mod.Phys. D12 (2003) 963-976 | 10.1142/S0218271803003530 | null | gr-qc hep-th | null | Penrose [1] has emphasized how the initial big bang singularity requires a
special low entropy state. We address how recent brane cosmological schemes
address this problem and whether they offer any apparent resolution. Pushing
the start time back to $t=-\infty$ or utilizing maximally symmetric AdS spaces
simply exac... | [
{
"created": "Thu, 28 Feb 2002 19:11:16 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jul 2002 10:00:41 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Aug 2002 15:48:35 GMT",
"version": "v3"
},
{
"created": "Wed, 18 Sep 2002 16:53:00 GMT",
"version": "v4"
}
] | 2016-08-31 | [
[
"Coule",
"D. H.",
""
]
] | Penrose [1] has emphasized how the initial big bang singularity requires a special low entropy state. We address how recent brane cosmological schemes address this problem and whether they offer any apparent resolution. Pushing the start time back to $t=-\infty$ or utilizing maximally symmetric AdS spaces simply exacer... |
2009.09319 | Ran Li | Ran Li, Jin Wang | Hawking Radiation and $P-v$ Criticality of Charged Dynamical (Vaidya)
Black Hole in Anti-de Sitter Space | null | Phys. Lett. B 813 (2021) 136035 | 10.1016/j.physletb.2020.136035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Hawking radiation and $P-v$ criticality of charged dynamical
(Vaidya) black hole in Anti-de Sitter (AdS) space. By investigating the near
horizon properties of scalar field, we derive Hawking temperature of dynamical
charged (Vaidya) AdS black hole. Based on this result, by regarding the
cosmological constan... | [
{
"created": "Sat, 19 Sep 2020 23:16:37 GMT",
"version": "v1"
}
] | 2020-12-21 | [
[
"Li",
"Ran",
""
],
[
"Wang",
"Jin",
""
]
] | We study Hawking radiation and $P-v$ criticality of charged dynamical (Vaidya) black hole in Anti-de Sitter (AdS) space. By investigating the near horizon properties of scalar field, we derive Hawking temperature of dynamical charged (Vaidya) AdS black hole. Based on this result, by regarding the cosmological constant ... |
1501.02104 | Michal Pirog | Piotr Jaranowski, Patryk Mach, Edward Malec and Michal Pirog | Virial tests for post-Newtonian stationary black-hole-disk systems | 6 pages, a talk given at The Spanish Relativity Meeting (Encuentros
Realtivistas Espanoles - ERE), Valencia, 2014 | null | 10.1088/1742-6596/600/1/012011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigated hydrodynamical post-Newtonian models of selfgravitating
stationary black-hole-disk systems. The post-Newtonian scheme presented here
and also in our recent paper is a continuation of previous, purely Newtonian
studies of selfgravitating hydrodynamical disks rotating according to the
Keplerian rotation... | [
{
"created": "Fri, 9 Jan 2015 11:17:01 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Jaranowski",
"Piotr",
""
],
[
"Mach",
"Patryk",
""
],
[
"Malec",
"Edward",
""
],
[
"Pirog",
"Michal",
""
]
] | We investigated hydrodynamical post-Newtonian models of selfgravitating stationary black-hole-disk systems. The post-Newtonian scheme presented here and also in our recent paper is a continuation of previous, purely Newtonian studies of selfgravitating hydrodynamical disks rotating according to the Keplerian rotation l... |
1104.4758 | Orlando Luongo | Orlando Luongo, Hernando Quevedo | Reconstructing the expansion history of the Universe with a one-fluid
approach | revtex4 style, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming that the Universe is filled by one single fluid, we present in the
context of General Relativity a possible explanation for the acceleration of
the Universe. We use ordinary thermodynamics and the fact that small matter
perturbations barely propagate in our Universe, to derive a general solution
for a single... | [
{
"created": "Mon, 25 Apr 2011 17:59:32 GMT",
"version": "v1"
}
] | 2011-04-26 | [
[
"Luongo",
"Orlando",
""
],
[
"Quevedo",
"Hernando",
""
]
] | Assuming that the Universe is filled by one single fluid, we present in the context of General Relativity a possible explanation for the acceleration of the Universe. We use ordinary thermodynamics and the fact that small matter perturbations barely propagate in our Universe, to derive a general solution for a single f... |
1709.00914 | Massimo Giovannini | Massimo Giovannini | Quantum coherence of cosmological perturbations | 10 pages, minor corrected typos; to appear in Mod.Phys. Lett. A | Mod. Phys. Lett. A 32, 1750191 (2017) | 10.1142/S0217732317501917 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The degrees of quantum coherence of cosmological perturbations of different
spins are computed in the large-scale limit and compared with the standard
results holding for a single mode of the electromagnetic field in an optical
cavity. The degree second-order coherence of curvature inhomogeneities (and,
more generall... | [
{
"created": "Mon, 4 Sep 2017 12:22:53 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Oct 2017 18:58:53 GMT",
"version": "v2"
}
] | 2017-11-09 | [
[
"Giovannini",
"Massimo",
""
]
] | The degrees of quantum coherence of cosmological perturbations of different spins are computed in the large-scale limit and compared with the standard results holding for a single mode of the electromagnetic field in an optical cavity. The degree second-order coherence of curvature inhomogeneities (and, more generally,... |
gr-qc/0407088 | Plamen Fiziev | P.P.Fiziev | On the Solutions of Einstein Equations with Massive Point Source | 14 pages, latex file, no figures, new essential comments and
references added | null | null | SU-04/07-02 | gr-qc | null | We show that Einstein equations are compatible with the presence of massive
point particles and find corresponding two parameter family of their solutions
which depends on the bare mechanical mass $M_0>0$ and the Keplerian mass
$M<M_0$ of the point source of gravity. The global analytical properties of
these solution... | [
{
"created": "Fri, 23 Jul 2004 15:15:47 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Jul 2004 11:53:14 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Dec 2004 13:18:25 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Fiziev",
"P. P.",
""
]
] | We show that Einstein equations are compatible with the presence of massive point particles and find corresponding two parameter family of their solutions which depends on the bare mechanical mass $M_0>0$ and the Keplerian mass $M<M_0$ of the point source of gravity. The global analytical properties of these solutions ... |
gr-qc/0005015 | Alexander Feinstein | Alexander Feinstein | Exact Inflationary Solutions from a Superpotential | 6 pages, no figures | null | null | EHU-FT/0006 | gr-qc | null | We propose a novel, potentially useful generating technique for constructing
exact solutions of inflationary scalar field cosmologies with non-trivial
potentials. The generating scheme uses the so-called superpotential and is
inspired by recent studies of similar equations in supergravity. Some exact
solutions are de... | [
{
"created": "Thu, 4 May 2000 08:15:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Feinstein",
"Alexander",
""
]
] | We propose a novel, potentially useful generating technique for constructing exact solutions of inflationary scalar field cosmologies with non-trivial potentials. The generating scheme uses the so-called superpotential and is inspired by recent studies of similar equations in supergravity. Some exact solutions are deri... |
1810.01094 | Paolo Pani | Paolo Pani and Leonardo Gualtieri and Tiziano Abdelsalhin and Xisco
Jim\'enez Forteza | Magnetic tidal Love numbers clarified | v2: 4 pages, one extra equation. Matches the PRD version | Phys. Rev. D 98, 124023 (2018) | 10.1103/PhysRevD.98.124023 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this brief note, we clarify certain aspects related to the magnetic (i.e.,
odd parity or axial) tidal Love numbers of a star in general relativity.
Magnetic tidal deformations of a compact star had been computed in 2009
independently by Damour and Nagar and by Binnington and Poisson. More recently,
Landry and Pois... | [
{
"created": "Tue, 2 Oct 2018 07:09:36 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Dec 2018 22:45:05 GMT",
"version": "v2"
}
] | 2018-12-20 | [
[
"Pani",
"Paolo",
""
],
[
"Gualtieri",
"Leonardo",
""
],
[
"Abdelsalhin",
"Tiziano",
""
],
[
"Forteza",
"Xisco Jiménez",
""
]
] | In this brief note, we clarify certain aspects related to the magnetic (i.e., odd parity or axial) tidal Love numbers of a star in general relativity. Magnetic tidal deformations of a compact star had been computed in 2009 independently by Damour and Nagar and by Binnington and Poisson. More recently, Landry and Poisso... |
0910.5377 | Th. M. Nieuwenhuizen | Theo M. Nieuwenhuizen and Vaclav Spicka | Bose-Einstein condensed supermassive black holes: a case of renormalized
quantum field theory in curved space-time | 18 pages Latex Physica E style | null | 10.1016/j.physe.2009.10.040 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates the question whether a realistic black hole can be in
principal similar to a star, having a large but finite redshift at its horizon.
If matter spreads throughout the interior of a supermassive black hole with
mass $M\sim10^9M_\odot$, it has an average density comparable to air and it may
aris... | [
{
"created": "Wed, 28 Oct 2009 13:50:51 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Nieuwenhuizen",
"Theo M.",
""
],
[
"Spicka",
"Vaclav",
""
]
] | This paper investigates the question whether a realistic black hole can be in principal similar to a star, having a large but finite redshift at its horizon. If matter spreads throughout the interior of a supermassive black hole with mass $M\sim10^9M_\odot$, it has an average density comparable to air and it may arise ... |
1405.6697 | Camilo Posada | Camilo Posada | Imbedding a Reissner-Nordstr\"om charged mass into cosmology | 7 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the extension of the method of imbedding a mass into cosmology
proposed by Gautreau, for the case of a Reissner-Nordstr\"om charged mass. We
work in curvature coordinates $(R,T)$ where the coordinate time $T$ is measured
by clocks at fixed points $R = $ const., and geodesic coordinates $(R,\tau)$
where $\t... | [
{
"created": "Mon, 26 May 2014 19:50:42 GMT",
"version": "v1"
}
] | 2014-05-27 | [
[
"Posada",
"Camilo",
""
]
] | We present the extension of the method of imbedding a mass into cosmology proposed by Gautreau, for the case of a Reissner-Nordstr\"om charged mass. We work in curvature coordinates $(R,T)$ where the coordinate time $T$ is measured by clocks at fixed points $R = $ const., and geodesic coordinates $(R,\tau)$ where $\tau... |
2408.05581 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Thin-shell wormholes admitting conformal motions in spacetimes of
embedding class one | 10 pages, no figures | Int. J. Astron. Astrophys. (IJAA) vol. 14, pp. 162-171, 2024 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper discusses the feasibility of thin-shell wormholes in spacetimes of
embedding class one admitting a one-parameter group of conformal motions. It is
shown that the surface energy density $\sigma$ is positive, while the surface
pressure $\mathcal{P}$ is negative, resulting in $\sigma +\mathcal{P}<0$,
thereby ... | [
{
"created": "Sat, 10 Aug 2024 15:16:25 GMT",
"version": "v1"
}
] | 2024-08-13 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | This paper discusses the feasibility of thin-shell wormholes in spacetimes of embedding class one admitting a one-parameter group of conformal motions. It is shown that the surface energy density $\sigma$ is positive, while the surface pressure $\mathcal{P}$ is negative, resulting in $\sigma +\mathcal{P}<0$, thereby si... |
1908.01195 | Sanjar Shaymatov | Sanjar Shaymatov, Naresh Dadhich, Bobomurat Ahmedov, Mubasher Jamil | Five dimensional charged rotating minimally gauged supergravity black
hole cannot be over-spun and/or over-charged in non-linear accretion | 12 pages, 2 figures; accepted for publication in Eur. Phys. J. C.
Figures and further references have been added | Eur. Phys. J. C (2020) 80:481 | 10.1140/epjc/s10052-020-8009-4 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Generally black hole could be over charged/spun violating the weak cosmic
censorship conjecture (WCCC) for linear order accretion while the same is
always restored back for non-linear accretion. The only exception however is
that of a five dimensional rotating black hole with single rotation that cannot
be overspun e... | [
{
"created": "Sat, 3 Aug 2019 16:14:15 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Mar 2020 13:10:39 GMT",
"version": "v2"
},
{
"created": "Mon, 25 May 2020 23:38:15 GMT",
"version": "v3"
}
] | 2020-05-29 | [
[
"Shaymatov",
"Sanjar",
""
],
[
"Dadhich",
"Naresh",
""
],
[
"Ahmedov",
"Bobomurat",
""
],
[
"Jamil",
"Mubasher",
""
]
] | Generally black hole could be over charged/spun violating the weak cosmic censorship conjecture (WCCC) for linear order accretion while the same is always restored back for non-linear accretion. The only exception however is that of a five dimensional rotating black hole with single rotation that cannot be overspun eve... |
0811.0756 | Lorenzo Iorio | Lorenzo Iorio | On the recently determined anomalous perihelion precession of Saturn | LaTex2e, 14 pages, no figures, 2 tables. Accepted by The Astronomical
Journal (AJ) | The Astronomical Journal 137 (2009) 3615-3618 | 10.1088/0004-6256/137/3/3615 | null | gr-qc astro-ph hep-ph physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The astronomer E.V. Pitjeva, by analyzing with the EPM2008 ephemerides a
large number of planetary observations including also two years (2004-2006) of
normal points from the Cassini spacecraft, phenomenologically estimated a
statistically significant non-zero correction to the usual
Newtonian/Einsteinian secular pre... | [
{
"created": "Wed, 5 Nov 2008 15:54:42 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Nov 2008 15:06:57 GMT",
"version": "v2"
},
{
"created": "Sun, 9 Nov 2008 13:52:08 GMT",
"version": "v3"
},
{
"created": "Wed, 24 Dec 2008 20:36:53 GMT",
"version": "v4"
}
] | 2009-02-24 | [
[
"Iorio",
"Lorenzo",
""
]
] | The astronomer E.V. Pitjeva, by analyzing with the EPM2008 ephemerides a large number of planetary observations including also two years (2004-2006) of normal points from the Cassini spacecraft, phenomenologically estimated a statistically significant non-zero correction to the usual Newtonian/Einsteinian secular prece... |
1607.06222 | Bethan Cropp | Bethan Cropp, Swastik Bhattacharya, S. Shankaranarayanan | Hints of quantum gravity from the horizon fluid | v2: This version accepted to PRD, 10 pages | Phys. Rev. D 95, 024006 (2017) | 10.1103/PhysRevD.95.024006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For many years researchers have tried to glean hints about quantum gravity
from black hole thermodynamics. However, black hole thermodynamics suffers from
the problem of Universality --- at leading order, several approaches with
different microscopic degrees of freedom lead to Bekenstein-Hawking entropy. We
attempt t... | [
{
"created": "Thu, 21 Jul 2016 07:56:00 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2016 06:43:07 GMT",
"version": "v2"
}
] | 2017-01-11 | [
[
"Cropp",
"Bethan",
""
],
[
"Bhattacharya",
"Swastik",
""
],
[
"Shankaranarayanan",
"S.",
""
]
] | For many years researchers have tried to glean hints about quantum gravity from black hole thermodynamics. However, black hole thermodynamics suffers from the problem of Universality --- at leading order, several approaches with different microscopic degrees of freedom lead to Bekenstein-Hawking entropy. We attempt to ... |
2003.10125 | Masataka Tsuchiya | Masataka Tsuchiya, Chul-Moon Yoo, Yasutaka Koga, Tomohiro Harada | Sonic Point and Photon Surface | 34 pages | Phys. Rev. D 102, 044057 (2020) | 10.1103/PhysRevD.102.044057 | RUP-20-8 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The sonic point/photon surface correspondence is thoroughly investigated in a
general setting. First, we investigate a sonic point of a transonic steady
perfect fluid flow in a general stationary spacetime, particularly focusing on
the radiation fluid. The necessary conditions that the flow must satisfy at a
sonic po... | [
{
"created": "Mon, 23 Mar 2020 08:23:33 GMT",
"version": "v1"
}
] | 2020-09-09 | [
[
"Tsuchiya",
"Masataka",
""
],
[
"Yoo",
"Chul-Moon",
""
],
[
"Koga",
"Yasutaka",
""
],
[
"Harada",
"Tomohiro",
""
]
] | The sonic point/photon surface correspondence is thoroughly investigated in a general setting. First, we investigate a sonic point of a transonic steady perfect fluid flow in a general stationary spacetime, particularly focusing on the radiation fluid. The necessary conditions that the flow must satisfy at a sonic poin... |
1304.4313 | Florian Beyer | Florian Beyer, Leon Escobar | Graceful exit from inflation for minimally coupled Bianchi A scalar
field models | 37 pages, 26 figures; matches the version published in CQG | Class. Quantum Grav. 30 (2013) 195020 | 10.1088/0264-9381/30/19/195020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the dynamics of Bianchi A scalar field models which undergo
inflation. The main question is under which conditions does inflation come to
an end and is succeeded by a decelerated epoch. This so-called "graceful exit"
from inflation is an important ingredient in the standard model of cosmology,
but is, at ... | [
{
"created": "Tue, 16 Apr 2013 02:31:54 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2013 01:07:02 GMT",
"version": "v2"
}
] | 2013-09-20 | [
[
"Beyer",
"Florian",
""
],
[
"Escobar",
"Leon",
""
]
] | We consider the dynamics of Bianchi A scalar field models which undergo inflation. The main question is under which conditions does inflation come to an end and is succeeded by a decelerated epoch. This so-called "graceful exit" from inflation is an important ingredient in the standard model of cosmology, but is, at th... |
gr-qc/9909056 | Ioannis Raptis | Ioannis Raptis | A Non-Classical Linear Xenomorph as a Model for Quantum Causal Space | LaTeX 2.09, 20 pages | null | null | null | gr-qc | null | A quantum picture of the causal structure of Minkowski space M is presented.
The mathematical model employed to this end is a non-classical version of the
classical topos {H} of real quaternion algebras used elsewhere to organize the
perceptions of spacetime events of a Boolean observer into M. Certain key
properties... | [
{
"created": "Mon, 20 Sep 1999 14:36:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Raptis",
"Ioannis",
""
]
] | A quantum picture of the causal structure of Minkowski space M is presented. The mathematical model employed to this end is a non-classical version of the classical topos {H} of real quaternion algebras used elsewhere to organize the perceptions of spacetime events of a Boolean observer into M. Certain key properties o... |
1906.09648 | Konstantinos Dimopoulos | Konstantinos Dimopoulos and Leonora Donaldson-Wood | Warm Quintessential Inflation | 14 pages, 2 figures, published version | null | 10.1016/j.physletb.2019.07.017 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce warm quintessential inflation and study it in the weak
dissipative regime. We consider the original quintessential inflation model,
which approximates quartic chaotic inflation at early times and thawing quartic
inverse-power-law quintessence at present. We find that the model successfully
accounts for b... | [
{
"created": "Sun, 23 Jun 2019 20:50:29 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jul 2019 21:21:14 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Jul 2019 16:06:37 GMT",
"version": "v3"
}
] | 2019-07-17 | [
[
"Dimopoulos",
"Konstantinos",
""
],
[
"Donaldson-Wood",
"Leonora",
""
]
] | We introduce warm quintessential inflation and study it in the weak dissipative regime. We consider the original quintessential inflation model, which approximates quartic chaotic inflation at early times and thawing quartic inverse-power-law quintessence at present. We find that the model successfully accounts for bot... |
2212.09495 | Aaron Held | Astrid Eichhorn and Aaron Held | Black holes in asymptotically safe gravity and beyond | invited chapter for the book ''Regular Black Holes: Towards a New
Paradigm of the Gravitational Collapse''; comments welcome | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Asymptotically safe quantum gravity is an approach to quantum gravity that
achieves formulates a standard quantum field theory for the metric. Therefore,
even the deep quantum gravity regime, that is expected to determine the true
structure of the core of black holes, is described by a spacetime metric. The
essence o... | [
{
"created": "Mon, 19 Dec 2022 14:29:38 GMT",
"version": "v1"
}
] | 2022-12-20 | [
[
"Eichhorn",
"Astrid",
""
],
[
"Held",
"Aaron",
""
]
] | Asymptotically safe quantum gravity is an approach to quantum gravity that achieves formulates a standard quantum field theory for the metric. Therefore, even the deep quantum gravity regime, that is expected to determine the true structure of the core of black holes, is described by a spacetime metric. The essence of ... |
2105.12423 | Sauvik Sen | Sauvik Sen | Hawking radiation for a (2+1)-dimensional spinning black hole and the
issue of tunneling | Errors noticed in the governing equations | null | null | null | gr-qc hep-th math-ph math.MP quant-ph | http://creativecommons.org/publicdomain/zero/1.0/ | We examine Hawking radiation for a (2+1)-dimensional spinning black hole and
study the interesting possibility of tunneling through the event horizon which
acts as a classically forbidden barrier. Our finding shows it to be much lower
than its nonrotating counterpart. We further explore the associated
thermodynamics ... | [
{
"created": "Wed, 26 May 2021 09:24:51 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jun 2021 09:56:21 GMT",
"version": "v2"
},
{
"created": "Thu, 18 Nov 2021 02:53:59 GMT",
"version": "v3"
}
] | 2021-11-19 | [
[
"Sen",
"Sauvik",
""
]
] | We examine Hawking radiation for a (2+1)-dimensional spinning black hole and study the interesting possibility of tunneling through the event horizon which acts as a classically forbidden barrier. Our finding shows it to be much lower than its nonrotating counterpart. We further explore the associated thermodynamics in... |
2401.08346 | Tony Rothman | Peter Anninos, Tony Rothman and Andrea Palessandro | Graviton-Photon Oscillations in an Expanding Universe | 27 pages, no figures | Physics of the Dark Universe Volume 44, May 2024, 101480 | 10.1016/j.dark.2024.101480 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Through the Gertsenshtein effect, the presence of a large external B-field
may allow photons and gravitons to mix in a way that resembles neutrino
oscillations and is even more similar to axion-photon mixing. Assuming a
background B-field (or any field that behaves like one), we examine the
Gertsenshtein mechanism in... | [
{
"created": "Tue, 16 Jan 2024 13:27:25 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Apr 2024 21:49:28 GMT",
"version": "v2"
}
] | 2024-04-03 | [
[
"Anninos",
"Peter",
""
],
[
"Rothman",
"Tony",
""
],
[
"Palessandro",
"Andrea",
""
]
] | Through the Gertsenshtein effect, the presence of a large external B-field may allow photons and gravitons to mix in a way that resembles neutrino oscillations and is even more similar to axion-photon mixing. Assuming a background B-field (or any field that behaves like one), we examine the Gertsenshtein mechanism in t... |
1012.5375 | Kiyoshi Shiraishi | Nahomi Kan (Yamaguchi Junior College), Takuya Maki (Japan Women's
College of Physical Education) and Kiyoshi Shiraishi (Yamaguchi University) | Weyl invariant Dirac-Born-Infeld-Einstein theory | 4 pages. To appear in the Proceedings of 20th Workshop in General
Relativity and Gravitation in Japan (JGRG20), held in Yukawa Institute for
Theoretical Physics, Kyoto University, Kyoto, Japan (21 - 25 September 2010) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a Weyl invariant extension of Dirac-Born-Infeld type gravity. An
appropriate choice of the metric hides the scalar degree of freedom which is
required by the local scale invariance of the action at the first sight, and
then a vector field acquires mass. Moreover, nonminimal couplings of the vector
field a... | [
{
"created": "Fri, 24 Dec 2010 09:45:19 GMT",
"version": "v1"
}
] | 2010-12-27 | [
[
"Kan",
"Nahomi",
"",
"Yamaguchi Junior College"
],
[
"Maki",
"Takuya",
"",
"Japan Women's\n College of Physical Education"
],
[
"Shiraishi",
"Kiyoshi",
"",
"Yamaguchi University"
]
] | We consider a Weyl invariant extension of Dirac-Born-Infeld type gravity. An appropriate choice of the metric hides the scalar degree of freedom which is required by the local scale invariance of the action at the first sight, and then a vector field acquires mass. Moreover, nonminimal couplings of the vector field and... |
2201.06722 | Glauber Carvalho Dorsch | Glauber C. Dorsch and Lucas E. A. Porto | An introduction to gravitational waves through electrodynamics: a
quadrupole comparison | 26 pages, 4 figures | null | 10.1088/1361-6404/ac4645 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a pedagogical introduction to some key computations in
gravitational waves via a side-by-side comparison with the quadrupole
contribution of electromagnetic radiation. Subtleties involving gauge choices
and projections over transverse modes in the tensorial theory are made clearer
by direct analogy with th... | [
{
"created": "Tue, 18 Jan 2022 03:52:34 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jan 2022 17:45:05 GMT",
"version": "v2"
}
] | 2022-01-31 | [
[
"Dorsch",
"Glauber C.",
""
],
[
"Porto",
"Lucas E. A.",
""
]
] | We present a pedagogical introduction to some key computations in gravitational waves via a side-by-side comparison with the quadrupole contribution of electromagnetic radiation. Subtleties involving gauge choices and projections over transverse modes in the tensorial theory are made clearer by direct analogy with the ... |
2209.04669 | Vasilis Oikonomou | V.K. Oikonomou, Pyotr Tsyba, Olga Razina | Probing our Universe's Past Using Earth's Geological and Climatological
History and Shadows of Galactic Black Holes | Invited article accepted in the journal Universe, special issue
''Modified Gravity Approaches to the Tensions of LCDM'' | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this short review, we discuss how Earth's climatological and geological
history and also how the shadows of galactic black holes might reveal our
Universe's past evolution. Specifically we point out that a pressure
singularity that occurred in our Universe's past might have left its imprint on
Earth's geological a... | [
{
"created": "Sat, 10 Sep 2022 14:05:29 GMT",
"version": "v1"
}
] | 2022-09-13 | [
[
"Oikonomou",
"V. K.",
""
],
[
"Tsyba",
"Pyotr",
""
],
[
"Razina",
"Olga",
""
]
] | In this short review, we discuss how Earth's climatological and geological history and also how the shadows of galactic black holes might reveal our Universe's past evolution. Specifically we point out that a pressure singularity that occurred in our Universe's past might have left its imprint on Earth's geological and... |
0810.2530 | Leor Barack | Norichika Sago, Leor Barack and Steven Detweiler | Two approaches for the gravitational self force in black hole spacetime:
Comparison of numerical results | 11 pages; minor typos corrected; final version to be published in PRD | Phys.Rev.D78:124024,2008 | 10.1103/PhysRevD.78.124024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, two independent calculations have been presented of finite-mass
("self-force") effects on the orbit of a point mass around a Schwarzschild
black hole. While both computations are based on the standard mode-sum method,
they differ in several technical aspects, which makes comparison between their
results dif... | [
{
"created": "Tue, 14 Oct 2008 19:44:00 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Dec 2008 16:42:22 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Sago",
"Norichika",
""
],
[
"Barack",
"Leor",
""
],
[
"Detweiler",
"Steven",
""
]
] | Recently, two independent calculations have been presented of finite-mass ("self-force") effects on the orbit of a point mass around a Schwarzschild black hole. While both computations are based on the standard mode-sum method, they differ in several technical aspects, which makes comparison between their results diffi... |
gr-qc/9609073 | Fernando Lombardo | Fernando C. Lombardo and Francisco D. Mazzitelli | Einstein-Langevin Equations from Running Coupling Constants | 10 pages, RevTex file, no figures | Phys.Rev.D55:3889-3892,1997 | 10.1103/PhysRevD.55.3889 | null | gr-qc | null | The Einstein-Langevin equations take into account the backreaction of quantum
matter fields on the background geometry. We present a derivation of these
equations to lowest order in a covariant expansion in powers of the curvature.
For massless fields, the equations are completely determined by the running
coupling c... | [
{
"created": "Mon, 30 Sep 1996 17:04:07 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Lombardo",
"Fernando C.",
""
],
[
"Mazzitelli",
"Francisco D.",
""
]
] | The Einstein-Langevin equations take into account the backreaction of quantum matter fields on the background geometry. We present a derivation of these equations to lowest order in a covariant expansion in powers of the curvature. For massless fields, the equations are completely determined by the running coupling con... |
gr-qc/0412045 | Juan A. Valiente-Kroon | J. A. Valiente Kroon | Time asymmetric spacetimes near null and spatial infinity. II.
Expansions of developments of initial data sets with non-smooth conformal
metrics | Second part of gr-qc/0408062, 23 pages | Class.Quant.Grav. 22 (2005) 1683-1707 | 10.1088/0264-9381/22/9/015 | null | gr-qc | null | This article uses the conformal Einstein equations and the conformal
representation of spatial infinity introduced by Friedrich to analyse the
behaviour of the gravitational field near null and spatial infinity for the
development of initial data which are, in principle, non-conformally flat and
time asymmetric. This... | [
{
"created": "Fri, 10 Dec 2004 10:03:08 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kroon",
"J. A. Valiente",
""
]
] | This article uses the conformal Einstein equations and the conformal representation of spatial infinity introduced by Friedrich to analyse the behaviour of the gravitational field near null and spatial infinity for the development of initial data which are, in principle, non-conformally flat and time asymmetric. This a... |
2103.13980 | K. Sravan Kumar | K. Sravan Kumar, Shubham Maheshwari, Anupam Mazumdar and Jun Peng | An anisotropic bouncing universe in non-local gravity | 18 pages, 1 figure, 1 table. We dedicate this work to the memory of
John D. Barrow. v2 matches the one published in JCAP | JCAP07(2021)025 | 10.1088/1475-7516/2021/07/025 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We show that it is possible to realize a cosmological bouncing solution in an
anisotropic but homogeneous Bianchi-I background in a class of non-local,
infinite derivative theories of gravity. We show that the anisotropic shear
grows slower than in general relativity during the contraction phase, peaks to
a finite va... | [
{
"created": "Thu, 25 Mar 2021 17:12:36 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jul 2021 07:23:02 GMT",
"version": "v2"
}
] | 2021-07-20 | [
[
"Kumar",
"K. Sravan",
""
],
[
"Maheshwari",
"Shubham",
""
],
[
"Mazumdar",
"Anupam",
""
],
[
"Peng",
"Jun",
""
]
] | We show that it is possible to realize a cosmological bouncing solution in an anisotropic but homogeneous Bianchi-I background in a class of non-local, infinite derivative theories of gravity. We show that the anisotropic shear grows slower than in general relativity during the contraction phase, peaks to a finite valu... |
gr-qc/0002049 | Frederick J. Ernst | I. Hauser and F. J. Ernst | Proof of a generalized Geroch conjecture for the hyperbolic Ernst
equation | 75 pages (plus optional table of contents). Sign errors in elliptic
case equations (1A.13), (1A.15) and (1A.25) are corrected. Not relevant to
proof contained in paper | Gen.Rel.Grav.33:195-293,2001 | 10.1023/A:1002701301339 | null | gr-qc | null | We enunciate and prove here a generalization of Geroch's famous conjecture
concerning analytic solutions of the elliptic Ernst equation. Our
generalization is stated for solutions of the hyperbolic Ernst equation that
are not necessarily analytic, although it can be formulated also for solutions
of the elliptic Ernst... | [
{
"created": "Mon, 14 Feb 2000 15:55:50 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Oct 2000 12:10:25 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hauser",
"I.",
""
],
[
"Ernst",
"F. J.",
""
]
] | We enunciate and prove here a generalization of Geroch's famous conjecture concerning analytic solutions of the elliptic Ernst equation. Our generalization is stated for solutions of the hyperbolic Ernst equation that are not necessarily analytic, although it can be formulated also for solutions of the elliptic Ernst e... |
0709.4588 | Leor Barack | Leor Barack, Darren A. Golbourn and Norichika Sago | m-Mode Regularization Scheme for the Self Force in Kerr Spacetime | 17 pages. Minor typos corrected; version to appear in PRD | Phys.Rev.D76:124036,2007 | 10.1103/PhysRevD.76.124036 | null | gr-qc astro-ph | null | We present a new, simple method for calculating the scalar, electromagnetic,
and gravitational self forces acting on particles in orbit around a Kerr black
hole. The standard ``mode-sum regularization'' approach for self-force
calculations relies on a decomposition of the full (retarded) perturbation
field into multi... | [
{
"created": "Fri, 28 Sep 2007 12:00:45 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Dec 2007 11:21:29 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Barack",
"Leor",
""
],
[
"Golbourn",
"Darren A.",
""
],
[
"Sago",
"Norichika",
""
]
] | We present a new, simple method for calculating the scalar, electromagnetic, and gravitational self forces acting on particles in orbit around a Kerr black hole. The standard ``mode-sum regularization'' approach for self-force calculations relies on a decomposition of the full (retarded) perturbation field into multipo... |
gr-qc/0102099 | Roberto Colistete Junior | R. Kerner, J.W. van Holten, R. Colistete Jr | Relativistic Epicycles : another approach to geodesic deviations | 23 pages, LaTeX, 2 Postscript figures. Version substantially improved
to be published in Classical and Quantum Gravity, with : additional figure,
references, rewritten text, minor corrections, etc | Class.Quant.Grav. 18 (2001) 4725-4742 | 10.1088/0264-9381/18/22/302 | null | gr-qc astro-ph | null | We solve the geodesic deviation equations for the orbital motions in the
Schwarzschild metric which are close to a circular orbit. It turns out that in
this particular case the equations reduce to a linear system, which after
diagonalization describes just a collection of harmonic oscillators, with two
characteristic... | [
{
"created": "Thu, 22 Feb 2001 16:25:16 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Sep 2001 15:51:52 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Kerner",
"R.",
""
],
[
"van Holten",
"J. W.",
""
],
[
"Colistete",
"R.",
"Jr"
]
] | We solve the geodesic deviation equations for the orbital motions in the Schwarzschild metric which are close to a circular orbit. It turns out that in this particular case the equations reduce to a linear system, which after diagonalization describes just a collection of harmonic oscillators, with two characteristic f... |
1808.00172 | Tanmoy Paul | Tanmoy Paul and Soumitra SenGupta | Dynamical suppression of spacetime torsion | EPJC accepted | null | 10.1140/epjc/s10052-019-7109-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A surprising feature of our present four dimensional universe is that its
evolution appears to be governed solely by spacetime curvature without any
noticeable effect of spacetime torsion. In the present paper, we give a
possible explanation of this enigma through ``cosmological evolution'' of
spacetime torsion in th... | [
{
"created": "Wed, 1 Aug 2018 05:35:35 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Jul 2019 17:02:01 GMT",
"version": "v2"
}
] | 2019-09-04 | [
[
"Paul",
"Tanmoy",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | A surprising feature of our present four dimensional universe is that its evolution appears to be governed solely by spacetime curvature without any noticeable effect of spacetime torsion. In the present paper, we give a possible explanation of this enigma through ``cosmological evolution'' of spacetime torsion in the ... |
gr-qc/9603047 | Rudolf Poppe | Andre' Lukas and Rudolf Poppe | Decoherence in Pre-Big-Bang Cosmology | 15 pages, 2 postscript figures included | Mod.Phys.Lett. A12 (1997) 597-612 | 10.1142/S0217732397000625 | TUM-HEP 240/96, SFB-375/87 | gr-qc hep-th | null | We analyze the quantum cosmology of the simplest pre--big--bang model without
dilaton potential. In addition to the minisuperspace variables we include
inhomogeneous dilaton fluctuations and determine their wave function on a
semiclassical background. This wave function is used to calculate the reduced
density matrix... | [
{
"created": "Mon, 25 Mar 1996 16:50:11 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Lukas",
"Andre'",
""
],
[
"Poppe",
"Rudolf",
""
]
] | We analyze the quantum cosmology of the simplest pre--big--bang model without dilaton potential. In addition to the minisuperspace variables we include inhomogeneous dilaton fluctuations and determine their wave function on a semiclassical background. This wave function is used to calculate the reduced density matrix a... |
0803.1998 | Alexis Larranaga | Alexis Larranaga | On the Thermodynamical Relation between Rotating Charged BTZ Black Holes
and Effective String Theory | 9 pages | Commun.Theor.Phys.50:1341-1344,2008 | 10.1088/0253-6102/50/6/19 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study the first law of thermodynamics for the (2+1)
dimensional rotating charged BTZ black hole considering a pair of
thermodinamical systems constructed with the two horizons of this solution. We
show that these two systems are similar to the right and left movers of string
theory and that the tempe... | [
{
"created": "Thu, 13 Mar 2008 16:08:09 GMT",
"version": "v1"
}
] | 2009-01-14 | [
[
"Larranaga",
"Alexis",
""
]
] | In this paper we study the first law of thermodynamics for the (2+1) dimensional rotating charged BTZ black hole considering a pair of thermodinamical systems constructed with the two horizons of this solution. We show that these two systems are similar to the right and left movers of string theory and that the tempera... |
gr-qc/0005108 | Elizabeth Winstanley | Adrian C. Ottewill and Elizabeth Winstanley | Divergence of a quantum thermal state on Kerr space-time | 7 pages, revtex, no figures | Phys.Lett. A273 (2000) 149-152 | 10.1016/S0375-9601(00)00487-4 | OUTP-00-23-P | gr-qc | null | We present a simple proof, using the conservation equations, that any quantum
stress tensor on Kerr space-time which is isotropic in a frame which rotates
rigidly with the angular velocity of the event horizon must be divergent at the
velocity of light surface. We comment on our result in the light of the absence
of ... | [
{
"created": "Wed, 24 May 2000 13:59:23 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Ottewill",
"Adrian C.",
""
],
[
"Winstanley",
"Elizabeth",
""
]
] | We present a simple proof, using the conservation equations, that any quantum stress tensor on Kerr space-time which is isotropic in a frame which rotates rigidly with the angular velocity of the event horizon must be divergent at the velocity of light surface. We comment on our result in the light of the absence of a ... |
1305.4524 | Andrew J. S. Hamilton | A. J. S. Hamilton | The Black Hole Particle Accelerator as a Machine to make Baby Universes | 7 pages, 2 figures. NO honorable mention in the 2013 Essay
Competition of the Gravity Research Foundation | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity predicts that the inner horizon of an astronomically
realistic rotating black hole is subject to the mass inflation instability. The
inflationary instability acts like a gravity-powered particle accelerator of
extraordinary power, accelerating accreted streams of particles along the
principal outgo... | [
{
"created": "Mon, 20 May 2013 13:25:36 GMT",
"version": "v1"
}
] | 2013-05-21 | [
[
"Hamilton",
"A. J. S.",
""
]
] | General relativity predicts that the inner horizon of an astronomically realistic rotating black hole is subject to the mass inflation instability. The inflationary instability acts like a gravity-powered particle accelerator of extraordinary power, accelerating accreted streams of particles along the principal outgoin... |
2402.15854 | Krishnendu De Dr. | Young Jin Suh, Krishnendu De and Uday Chand De | Impact of projective curvature tensor in $f\left(R,G\right)$,
$f\left(R,T\right)$ and $f\left(R,L_{m}\right)$-gravity | null | International journal of geometric methods in modern physics 2024, | 10.1142/S0219887824500622 | null | gr-qc math.DG | http://creativecommons.org/licenses/by/4.0/ | This article concerns with the characterization of a spacetime and modified
gravity, such as $f\left(R,G\right)$, $f\left(R,T\right)$ and
$f\left(R,L_{m}\right)$-gravity equipped with the projective curvature tensor.
We establish that a projectively flat perfect fluid spacetime represents dark
energy era. Also, we pr... | [
{
"created": "Sat, 24 Feb 2024 16:50:51 GMT",
"version": "v1"
}
] | 2024-02-27 | [
[
"Suh",
"Young Jin",
""
],
[
"De",
"Krishnendu",
""
],
[
"De",
"Uday Chand",
""
]
] | This article concerns with the characterization of a spacetime and modified gravity, such as $f\left(R,G\right)$, $f\left(R,T\right)$ and $f\left(R,L_{m}\right)$-gravity equipped with the projective curvature tensor. We establish that a projectively flat perfect fluid spacetime represents dark energy era. Also, we prov... |
0906.0145 | Yubei Yue | Yubei Yue and Bin Chen | K-Inflation with a Dark Energy Coupling | 8 pages, 1 figure | Phys.Rev.D81:023506,2010 | 10.1103/PhysRevD.81.023506 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is usually thought that the quintessence as a fundamental scalar field was
already present during the inflationary epoch. While there are various models
in which the quintessence couples to other species, it is attractive to
anticipate a coupling between the quintessence and the inflaton in the very
early universe... | [
{
"created": "Sun, 31 May 2009 11:15:50 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 2009 16:48:40 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Oct 2009 05:08:36 GMT",
"version": "v3"
},
{
"created": "Sun, 20 Dec 2009 14:39:37 GMT",
"version": "v4"
}
] | 2010-04-06 | [
[
"Yue",
"Yubei",
""
],
[
"Chen",
"Bin",
""
]
] | It is usually thought that the quintessence as a fundamental scalar field was already present during the inflationary epoch. While there are various models in which the quintessence couples to other species, it is attractive to anticipate a coupling between the quintessence and the inflaton in the very early universe a... |
gr-qc/0406096 | Achilles D. Speliotopoulos | A. D. Speliotopoulos and R. Y. Chiao | Differing Calculations of the Response of Matter-wave Interferometers to
Gravitational Waves | 36 pages, 2 figures, written in RevTeX, submitted to Physical Review
D | null | null | null | gr-qc | null | There now exists in the literature two different expressions for the phase
shift of a matter-wave interferometer caused by the passage of a gravitation
wave. The first, a commonly accepted expression that was first derived in the
1970s, is based on the traditional geodesic equation of motion (EOM) for a test
particle... | [
{
"created": "Wed, 23 Jun 2004 21:36:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Speliotopoulos",
"A. D.",
""
],
[
"Chiao",
"R. Y.",
""
]
] | There now exists in the literature two different expressions for the phase shift of a matter-wave interferometer caused by the passage of a gravitation wave. The first, a commonly accepted expression that was first derived in the 1970s, is based on the traditional geodesic equation of motion (EOM) for a test particle. ... |
2012.03517 | Dmitry Chirkov | Dmitry Chirkov, Alex Giacomini, Sergey A. Pavluchenko, Alexey
Toporensky | Cosmological solutions in Einstein-Gauss-Bonnet gravity with static
curved extra dimensions | 27 pages, 8 figures | Eur. Phys. J. C 81, 136 (2021) | 10.1140/epjc/s10052-021-08934-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we perform systematic investigation of all possible solutions
with static compact extra dimensions and expanding three-dimensional subspace
(``our Universe''). Unlike previous papers, we consider extra-dimensional
subspace to be constant-curvature manifold with both signs of spatial
curvature. We provid... | [
{
"created": "Mon, 7 Dec 2020 08:15:54 GMT",
"version": "v1"
}
] | 2021-04-22 | [
[
"Chirkov",
"Dmitry",
""
],
[
"Giacomini",
"Alex",
""
],
[
"Pavluchenko",
"Sergey A.",
""
],
[
"Toporensky",
"Alexey",
""
]
] | In this paper we perform systematic investigation of all possible solutions with static compact extra dimensions and expanding three-dimensional subspace (``our Universe''). Unlike previous papers, we consider extra-dimensional subspace to be constant-curvature manifold with both signs of spatial curvature. We provide ... |
1905.08276 | Jishnu Suresh | Sambit Panda, Swetha Bhagwat, Jishnu Suresh and Sanjit Mitra | Stochastic gravitational wave background mapmaking using regularised
deconvolution | 14 pages, 8 figures and 1 table | Phys. Rev. D 100, 043541 (2019) | 10.1103/PhysRevD.100.043541 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Obtaining a faithful source intensity distribution map of the sky from noisy
data demands incorporating known information of the expected signal, especially
when the signal is weak compared to the noise. We introduce a widely used
procedure to incorporate these priors through a Bayesian regularisation scheme
in the c... | [
{
"created": "Mon, 20 May 2019 18:05:58 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jun 2019 12:30:50 GMT",
"version": "v2"
}
] | 2019-09-04 | [
[
"Panda",
"Sambit",
""
],
[
"Bhagwat",
"Swetha",
""
],
[
"Suresh",
"Jishnu",
""
],
[
"Mitra",
"Sanjit",
""
]
] | Obtaining a faithful source intensity distribution map of the sky from noisy data demands incorporating known information of the expected signal, especially when the signal is weak compared to the noise. We introduce a widely used procedure to incorporate these priors through a Bayesian regularisation scheme in the con... |
2008.05285 | Gabriel R. Bengochea | Gabriel R. Bengochea, Gabriel Le\'on, Philip Pearle, Daniel Sudarsky | Discussions about the landscape of possibilities for treatments of
cosmic inflation involving continuous spontaneous localization models | 13 pages, 1 Appendix. Minor changes in title and abstract | Eur. Phys. J. C 80, 1021 (2020) | 10.1140/epjc/s10052-020-08599-z | null | gr-qc astro-ph.CO quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we consider a wide variety of alternatives opened when applying
the continuous spontaneous localization (CSL) dynamical collapse theory to the
inflationary era. The definitive resolution of many of the issues discussed
here will have to await, not only for a general relativistic CSL theory, but
for a ful... | [
{
"created": "Tue, 11 Aug 2020 03:11:21 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Nov 2020 02:26:50 GMT",
"version": "v2"
}
] | 2020-11-09 | [
[
"Bengochea",
"Gabriel R.",
""
],
[
"León",
"Gabriel",
""
],
[
"Pearle",
"Philip",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | In this work we consider a wide variety of alternatives opened when applying the continuous spontaneous localization (CSL) dynamical collapse theory to the inflationary era. The definitive resolution of many of the issues discussed here will have to await, not only for a general relativistic CSL theory, but for a fully... |
gr-qc/0009001 | Abel Camacho Quintana | Abel Camacho Quintana (Astrophysikalisches Institut Potsdam) | Group-theoretical structure of quantum measurements and equivalence
principle | 13 pages, accepted in Modern Physics Letters A | Mod.Phys.Lett. A15 (2000) 1461-1470 | 10.1142/S0217732300001882 | null | gr-qc quant-ph | null | The transverse group associated to some continuous quantum measuring
processes is analyzed in the presence of nonvanishing gravitational fields.
This is done considering, as an exmaple, the case of a particle whose
coordinates are being monitored. Employing the so called restricted path
integral formalism, it will be... | [
{
"created": "Fri, 1 Sep 2000 03:12:52 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Quintana",
"Abel Camacho",
"",
"Astrophysikalisches Institut Potsdam"
]
] | The transverse group associated to some continuous quantum measuring processes is analyzed in the presence of nonvanishing gravitational fields. This is done considering, as an exmaple, the case of a particle whose coordinates are being monitored. Employing the so called restricted path integral formalism, it will be s... |
2012.09075 | Jose Geraldo Pereira | J. G. Pereira and D. F. L\'opez | An Improved Framework for Quantum Gravity | 15 pages, no figures | Universe 6 (2020) 243 | 10.3390/universe6120243 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General relativity has two fundamental problems that render it unsuitable for
tackling the gravitational field's quantization. The first problem is the lack
of a genuine gravitational variable representing gravitation only, inertial
forces apart. The second problem is its incompatibility with quantum mechanics,
a pro... | [
{
"created": "Wed, 16 Dec 2020 16:56:39 GMT",
"version": "v1"
}
] | 2020-12-17 | [
[
"Pereira",
"J. G.",
""
],
[
"López",
"D. F.",
""
]
] | General relativity has two fundamental problems that render it unsuitable for tackling the gravitational field's quantization. The first problem is the lack of a genuine gravitational variable representing gravitation only, inertial forces apart. The second problem is its incompatibility with quantum mechanics, a probl... |
1612.02484 | Freddy Cueva Solano | Freddy Cueva Solano | Exploring the effects of a double reconstruction on the growth rate of
cosmic structure, using current observational data | 22 pages, 6 figures and 7 tables, Prepared for submission to PRD | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on General Relativity (GR) we consider two different cosmological
scenarios in where reconstruct the energy exchange (Q) between cold dark matter
(DM) fluid and dark energy (DE) fluid, which is modelled with a DE varying
equation of state (EoS) parameter {\omega}. We here investigate the main
cosmological effec... | [
{
"created": "Wed, 7 Dec 2016 23:27:39 GMT",
"version": "v1"
}
] | 2016-12-09 | [
[
"Solano",
"Freddy Cueva",
""
]
] | Based on General Relativity (GR) we consider two different cosmological scenarios in where reconstruct the energy exchange (Q) between cold dark matter (DM) fluid and dark energy (DE) fluid, which is modelled with a DE varying equation of state (EoS) parameter {\omega}. We here investigate the main cosmological effects... |
gr-qc/0210007 | Roland Steinbauer | Jiri Podolsky, Roland Steinbauer | Geodesics in spacetimes with expanding impulsive gravitational waves | 12 pages, Revtex, final version | Phys.Rev. D67 (2003) 064013 | 10.1103/PhysRevD.67.064013 | null | gr-qc | null | We study geodesic motion in expanding spherical impulsive gravitational waves
propagating in a Minkowski background. Employing the continuous form of the
metric we find and examine a large family of geometrically preferred geodesics.
For the special class of axially symmetric spacetimes with the spherical
impulse gen... | [
{
"created": "Wed, 2 Oct 2002 14:55:47 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Apr 2003 11:08:05 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Podolsky",
"Jiri",
""
],
[
"Steinbauer",
"Roland",
""
]
] | We study geodesic motion in expanding spherical impulsive gravitational waves propagating in a Minkowski background. Employing the continuous form of the metric we find and examine a large family of geometrically preferred geodesics. For the special class of axially symmetric spacetimes with the spherical impulse gener... |
1601.02235 | Guido Magnano | Guido Magnano | Nonlinear Gravitational Lagrangians revisited | Variational principles and conservation laws in General Relativity -
Workshop in memory of Prof. Mauro Francaviglia - Torino, June 25th-26th, 2015 | null | 10.1142/S0219887816400065 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Legendre transformation method, applied in 1987 to deal with purely
metric gravitational Lagrangians with nonlinear dependence on the Ricci tensor,
is extended to metric-affine models and is shown to provide a concise and
insightful comparison of the dynamical content of the two variational
frameworks.
| [
{
"created": "Sun, 10 Jan 2016 17:16:54 GMT",
"version": "v1"
}
] | 2016-09-21 | [
[
"Magnano",
"Guido",
""
]
] | The Legendre transformation method, applied in 1987 to deal with purely metric gravitational Lagrangians with nonlinear dependence on the Ricci tensor, is extended to metric-affine models and is shown to provide a concise and insightful comparison of the dynamical content of the two variational frameworks. |
2210.01138 | Johanna N. Borissova | Johanna N. Borissova, Alessia Platania | Formation and evaporation of quantum black holes from the decoupling
mechanism in quantum gravity | v5: some more typos fixed | null | 10.1007/JHEP03(2023)046 | NORDITA 2022-069 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new method to account for quantum-gravitational effects in
cosmological and black hole spacetimes. At the core of our construction is the
"decoupling mechanism": when a physical infrared scale overcomes the effect of
the regulator implementing the Wilsonian integration of fluctuating modes, the
renormali... | [
{
"created": "Mon, 3 Oct 2022 18:00:03 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Oct 2022 19:08:30 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Mar 2023 23:01:59 GMT",
"version": "v3"
},
{
"created": "Mon, 8 May 2023 13:03:41 GMT",
"version": "v4"
},
{
"cre... | 2023-05-24 | [
[
"Borissova",
"Johanna N.",
""
],
[
"Platania",
"Alessia",
""
]
] | We propose a new method to account for quantum-gravitational effects in cosmological and black hole spacetimes. At the core of our construction is the "decoupling mechanism": when a physical infrared scale overcomes the effect of the regulator implementing the Wilsonian integration of fluctuating modes, the renormaliza... |
2402.18993 | Philipp Dorau | Philipp Dorau, Rainer Verch | Kodama-like Vector Fields in Axisymmetric Spacetimes | 24 pages, 1 figure. v2: extended analysis of Kerr-Vaidya-de Sitter,
removed misconception regarding the ADM definition of mass, minor revisions | Class. Quantum Grav. 41 145008 (2024) | 10.1088/1361-6382/ad51c3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the concept of the Kodama symmetry, a quasi-local time translation
symmetry for dynamical spherically symmetric spacetimes, to a specific class of
dynamical axisymmetric spacetimes, namely the families of Kerr-Vaidya and
Kerr-Vaidya-de Sitter spacetimes. We study some geometrical properties of the
asymptoti... | [
{
"created": "Thu, 29 Feb 2024 09:46:37 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jun 2024 11:41:17 GMT",
"version": "v2"
}
] | 2024-07-12 | [
[
"Dorau",
"Philipp",
""
],
[
"Verch",
"Rainer",
""
]
] | We extend the concept of the Kodama symmetry, a quasi-local time translation symmetry for dynamical spherically symmetric spacetimes, to a specific class of dynamical axisymmetric spacetimes, namely the families of Kerr-Vaidya and Kerr-Vaidya-de Sitter spacetimes. We study some geometrical properties of the asymptotica... |
1305.3260 | Mauricio Bellini | Pablo Alejandro S\'anchez, Mauricio Bellini (IFIMAR - Mar del Plata
University and CONICET) | Inflationary dark energy from a condensate of spinors in a 5D vacuum | Final version to be published in a special number of IJMPD. Essay
awarded by the Gravity Research Foundation with the Honorable Mention -
Annual Essays Competition 2013 | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | What is the physical origin of dark energy? Could this energy be originated
by other fields than the inflaton? In this work we explore the possibility that
the expansion of the universe can be driven by a condensate of spinors. These
spinors are free of interactions on 5D relativistic vacuum in an extended de
Sitter ... | [
{
"created": "Tue, 14 May 2013 19:41:08 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Jul 2013 21:06:28 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Oct 2013 12:00:01 GMT",
"version": "v3"
},
{
"created": "Wed, 16 Oct 2013 22:15:53 GMT",
"version": "v4"
}
] | 2013-10-18 | [
[
"Sánchez",
"Pablo Alejandro",
"",
"IFIMAR - Mar del Plata\n University and CONICET"
],
[
"Bellini",
"Mauricio",
"",
"IFIMAR - Mar del Plata\n University and CONICET"
]
] | What is the physical origin of dark energy? Could this energy be originated by other fields than the inflaton? In this work we explore the possibility that the expansion of the universe can be driven by a condensate of spinors. These spinors are free of interactions on 5D relativistic vacuum in an extended de Sitter sp... |
gr-qc/0512057 | Diego Pavon | Jose P. Mimoso, Ana Nunes and Diego Pavon | Asymptotic behavior of the warm inflation scenario with viscous pressure | 31 pages, 2 figures, 3 tables. PACS numbers: 98.80Cq, 47.75+f | Phys.Rev. D73 (2006) 023502 | 10.1103/PhysRevD.73.023502 | null | gr-qc | null | We analyze the dynamics of models of warm inflation with general dissipative
effects. We consider phenomenological terms both for the inflaton decay rate
and for viscous effects within matter. We provide a classification of the
asymptotic behavior of these models and show that the existence of a late-time
scaling reg... | [
{
"created": "Fri, 9 Dec 2005 11:29:55 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Mimoso",
"Jose P.",
""
],
[
"Nunes",
"Ana",
""
],
[
"Pavon",
"Diego",
""
]
] | We analyze the dynamics of models of warm inflation with general dissipative effects. We consider phenomenological terms both for the inflaton decay rate and for viscous effects within matter. We provide a classification of the asymptotic behavior of these models and show that the existence of a late-time scaling regim... |
2407.18509 | Sohan Kumar Jha | Sohan Kumar Jha | Shadow, ISCO, Quasinormal modes, Hawking spectrum, Weak Gravitational
lensing, and parameter estimation of a Schwarzschild Black Hole Surrounded by
a Dehnen Type Dark Matter Halo | corrected version | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider \s black hole (BH) embedded in a Dehnen-$(1,4,0)$ type dark
matter halo (DDM) with two additional parameters - core radius $r_s$ and core
density $\rs$ apart from mass $M$. We analyze the event horizon, photon orbits,
and ISCO around DDM BHs and emphasize the impact of DDM parameters on them. Our
study re... | [
{
"created": "Fri, 26 Jul 2024 04:33:49 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Aug 2024 06:26:04 GMT",
"version": "v2"
}
] | 2024-08-13 | [
[
"Jha",
"Sohan Kumar",
""
]
] | We consider \s black hole (BH) embedded in a Dehnen-$(1,4,0)$ type dark matter halo (DDM) with two additional parameters - core radius $r_s$ and core density $\rs$ apart from mass $M$. We analyze the event horizon, photon orbits, and ISCO around DDM BHs and emphasize the impact of DDM parameters on them. Our study reve... |
gr-qc/9304037 | null | L. Diosi and B. Lukacs | Calculation of X-Ray Signals from Karolyhazy Hazy Space-Time | 7 pages, PlainTeX | Phys.Lett. 181A (1993) 366-368 | 10.1016/0375-9601(93)90389-H | null | gr-qc | null | Karolyhazy's hazy space-time model, invented for breaking down macroscopic
interferences, employs wave-like gravity disturbances. If so, then electric
charges would radiate permanently. Here we discuss the observational
consequences of the radiation. We find that such radiation is excluded by
common experimental situ... | [
{
"created": "Sat, 24 Apr 1993 00:09:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Diosi",
"L.",
""
],
[
"Lukacs",
"B.",
""
]
] | Karolyhazy's hazy space-time model, invented for breaking down macroscopic interferences, employs wave-like gravity disturbances. If so, then electric charges would radiate permanently. Here we discuss the observational consequences of the radiation. We find that such radiation is excluded by common experimental situat... |
gr-qc/0008059 | Innocenzo M. Pinto | R.P. Croce, Th. Demma, V.Pierro, I.M. Pinto, D. Churches, B.S.
Sathyaprakash | Gravitational Wave Chirp Search: Economization of PN Matched Filter Bank
via Cardinal Interpolation | scheduled for publicatin on Phys. Rev. D 62 | Phys.Rev.D62:121101,2000 | 10.1103/PhysRevD.62.121101 | null | gr-qc | null | The final inspiral phase in the evolution of a compact binary consisting of
black holes and/or neutron stars is among the most probable events that a
network of ground-based interferometric gravitational wave detectors is likely
to observe. Gravitational radiation emitted during this phase will have to be
dug out of ... | [
{
"created": "Thu, 24 Aug 2000 13:28:05 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Sep 2000 11:22:13 GMT",
"version": "v2"
}
] | 2009-12-30 | [
[
"Croce",
"R. P.",
""
],
[
"Demma",
"Th.",
""
],
[
"Pierro",
"V.",
""
],
[
"Pinto",
"I. M.",
""
],
[
"Churches",
"D.",
""
],
[
"Sathyaprakash",
"B. S.",
""
]
] | The final inspiral phase in the evolution of a compact binary consisting of black holes and/or neutron stars is among the most probable events that a network of ground-based interferometric gravitational wave detectors is likely to observe. Gravitational radiation emitted during this phase will have to be dug out of no... |
gr-qc/9903084 | Gerard 't Hooft | Gerard 't Hooft | Quantum Gravity as a Dissipative Deterministic System | 20 pages plain TeX, 2 figures PostScript. Added some further
explanations, and the definitions of `beable' and `changeable'. A minor error
corrected | Class.Quant.Grav.16:3263-3279,1999 | 10.1088/0264-9381/16/10/316 | THU-99/07 | gr-qc hep-th quant-ph | null | It is argued that the so-called holographic principle will obstruct attempts
to produce physically realistic models for the unification of general
relativity with quantum mechanics, unless determinism in the latter is
restored. The notion of time in GR is so different from the usual one in
elementary particle physics... | [
{
"created": "Mon, 22 Mar 1999 17:13:30 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Mar 1999 11:53:41 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Apr 1999 15:52:56 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Hooft",
"Gerard 't",
""
]
] | It is argued that the so-called holographic principle will obstruct attempts to produce physically realistic models for the unification of general relativity with quantum mechanics, unless determinism in the latter is restored. The notion of time in GR is so different from the usual one in elementary particle physics t... |
1710.02807 | Daniele Oriti | Daniele Oriti | Spacetime as a quantum many-body system | 15 pages; invited contribution to "Many-body approaches at different
scales: A tribute to Norman H. March on the occasion of his 90th birthday",
edited by G. G. N. Angilella and C. Amovilli (New York, Springer, 2017 - to
appear) | null | null | null | gr-qc cond-mat.other hep-th physics.hist-ph physics.pop-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum gravity has become a fertile interface between gravitational physics
and quantum many-body physics, with its double goal of identifying the
microscopic constituents of the universe and their fundamental dynamics, and of
understanding their collective properties and how spacetime and geometry
themselves emerge... | [
{
"created": "Sun, 8 Oct 2017 09:09:32 GMT",
"version": "v1"
}
] | 2017-10-10 | [
[
"Oriti",
"Daniele",
""
]
] | Quantum gravity has become a fertile interface between gravitational physics and quantum many-body physics, with its double goal of identifying the microscopic constituents of the universe and their fundamental dynamics, and of understanding their collective properties and how spacetime and geometry themselves emerge f... |
2002.10659 | Matt Visser | Thomas Berry (Victoria University of Wellington) and Matt Visser
(Victoria University of Wellington) | Relativistic combination of non-collinear 3-velocities using quaternions | V1: 13 pages. V2: now 17 pages. Four new references, four new pages
of discussion (relativistic combination of three 3-velocities) | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quaternions have an (over a century-old) extensive and quite complicated
interaction with special relativity. Since quaternions are intrinsically
4-dimensional, and do such a good job of handling 3-dimensional rotations, the
hope has always been that the use of quaternions would simplify some of the
algebra of the Lo... | [
{
"created": "Tue, 25 Feb 2020 04:09:08 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Mar 2020 09:11:18 GMT",
"version": "v2"
}
] | 2020-03-16 | [
[
"Berry",
"Thomas",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Quaternions have an (over a century-old) extensive and quite complicated interaction with special relativity. Since quaternions are intrinsically 4-dimensional, and do such a good job of handling 3-dimensional rotations, the hope has always been that the use of quaternions would simplify some of the algebra of the Lore... |
1506.00927 | Carlo Rovelli | Carlo Rovelli | The strange equation of quantum gravity | Appeared in the Classical and Quantum Gravity Focus issue: Milestones
of general relativity. 7 pages | Class. Quantum Grav. 32 (2015) 124005 | 10.1088/0264-9381/32/12/124005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Disavowed by one its fathers, ill defined, never empirically tested, the
Wheeler-DeWitt equation has nevertheless had a powerful influence on
fundamental physics. A well deserved one.
| [
{
"created": "Tue, 2 Jun 2015 15:36:51 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Rovelli",
"Carlo",
""
]
] | Disavowed by one its fathers, ill defined, never empirically tested, the Wheeler-DeWitt equation has nevertheless had a powerful influence on fundamental physics. A well deserved one. |
1403.5988 | Markus Lazar | Congrui Jin, Markus Lazar | A note on Lorentz-like transformations and superluminal motion | 9 pages, 1 figure | null | 10.1002/zamm.201300162 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this extended note a critical discussion of an extension of the Lorentz
transformations for velocities faster than the speed of light given recently by
Hill and Cox is provided. The presented approach reveals the connection between
faster-than-light speeds and the issue of isotropy of space. It is shown if the
rel... | [
{
"created": "Mon, 24 Mar 2014 15:09:35 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Apr 2014 16:56:30 GMT",
"version": "v2"
}
] | 2014-04-15 | [
[
"Jin",
"Congrui",
""
],
[
"Lazar",
"Markus",
""
]
] | In this extended note a critical discussion of an extension of the Lorentz transformations for velocities faster than the speed of light given recently by Hill and Cox is provided. The presented approach reveals the connection between faster-than-light speeds and the issue of isotropy of space. It is shown if the relat... |
gr-qc/0210108 | I. B. Khriplovich | I.B. Khriplovich | How Are Black Holes Quantized? | Talk at XXXVI Winter School of Petersburg Institute of Nuclear
Physics, Sanct-Petersburg, Februrary 2002 | null | null | null | gr-qc hep-th | null | Some approaches to quantization of the horizon area of black holes are
discussed. The maximum entropy of a quantized surface is demonstrated to be
proportional to the surface area in the classical limit. This result is valid
for a rather general class of approaches to surface quantization. In the case
of rotating bla... | [
{
"created": "Thu, 31 Oct 2002 06:30:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Khriplovich",
"I. B.",
""
]
] | Some approaches to quantization of the horizon area of black holes are discussed. The maximum entropy of a quantized surface is demonstrated to be proportional to the surface area in the classical limit. This result is valid for a rather general class of approaches to surface quantization. In the case of rotating black... |
1309.3523 | Adam Kelleher | Adam Kelleher | Dark Energy and Dark Matter in $f(R)$ Gravity and an Alternative
Chameleon Mechanism | null | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Metric $f(R)$ gravity theories behave like GR with cosmological constant when
$f"(R)$ = 0, and like scalar-tensor theories elsewhere. I investigate the
transition from $f"(R) \neq 0$ to $f"(R) = 0$, and show that this theory may
offer a way to explain Dark Energy and/or Dark Matter without having to make
use of the c... | [
{
"created": "Fri, 13 Sep 2013 17:43:51 GMT",
"version": "v1"
}
] | 2013-09-16 | [
[
"Kelleher",
"Adam",
""
]
] | Metric $f(R)$ gravity theories behave like GR with cosmological constant when $f"(R)$ = 0, and like scalar-tensor theories elsewhere. I investigate the transition from $f"(R) \neq 0$ to $f"(R) = 0$, and show that this theory may offer a way to explain Dark Energy and/or Dark Matter without having to make use of the cha... |
gr-qc/9506077 | Roberto Gomez | Simonetta Frittelli and Oscar Reula | On the Newtonian Limit of General Relativity | 16 pages, uses REVTeX | Commun.Math.Phys. 166 (1994) 221 | 10.1007/BF02112314 | null | gr-qc | null | We find a choice of variables for the 3+1 formulation of general relativity
which casts the evolution equations into (flux-conservative)
symmetric-hyperbolic first order form for arbitrary lapse and shift, for the
first time. We redefine the lapse function in terms of the determinant of the
3-metric and a free functi... | [
{
"created": "Thu, 29 Jun 1995 19:33:46 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Frittelli",
"Simonetta",
""
],
[
"Reula",
"Oscar",
""
]
] | We find a choice of variables for the 3+1 formulation of general relativity which casts the evolution equations into (flux-conservative) symmetric-hyperbolic first order form for arbitrary lapse and shift, for the first time. We redefine the lapse function in terms of the determinant of the 3-metric and a free function... |
1007.2734 | Miquel Pinyol Ribas | Miquel Pinyol Ribas, Ignacio Lopez Aylagas | Transition from Established Stationary Vision of Black Holes to
Never-Stationary Gravitational Collapse | 11 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The established concept of black hole emerged from several results founded on
Einstein's General Theory of Relativity. In this article, the relationship
between these results is analyzed, and it is pointed out how, in spite of being
individually correct, the sum of all them do not actually determine the
existence of ... | [
{
"created": "Fri, 16 Jul 2010 10:27:59 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jul 2010 15:14:18 GMT",
"version": "v2"
}
] | 2010-07-27 | [
[
"Ribas",
"Miquel Pinyol",
""
],
[
"Aylagas",
"Ignacio Lopez",
""
]
] | The established concept of black hole emerged from several results founded on Einstein's General Theory of Relativity. In this article, the relationship between these results is analyzed, and it is pointed out how, in spite of being individually correct, the sum of all them do not actually determine the existence of bl... |
gr-qc/9609038 | 65247 | I-Ching Yang, Ching-Tzung Yeh, Rue-Ron Hsu and Chin-Rong Lee | On the energy of a charged dilaton black hole | 12 pages, 6 figures, LaTeX | Int.J.Mod.Phys. D6 (1997) 349-356 | 10.1142/S0218271897000194 | NCKU-HEP/96-03 | gr-qc | null | Employing energy-momentum pseudotensor of Einstein, we obtian the energy
distribution of a dyonic dilaton black hole. The energy distribution of this
black hole depends on mass $ M $, electric charge $ Q_{e} $, magnetic charge $
Q_{m} $ and asymptotic values of the dilaton $ \phi_{0} $. We also mmake some
comparisons... | [
{
"created": "Fri, 13 Sep 1996 21:50:42 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Yang",
"I-Ching",
""
],
[
"Yeh",
"Ching-Tzung",
""
],
[
"Hsu",
"Rue-Ron",
""
],
[
"Lee",
"Chin-Rong",
""
]
] | Employing energy-momentum pseudotensor of Einstein, we obtian the energy distribution of a dyonic dilaton black hole. The energy distribution of this black hole depends on mass $ M $, electric charge $ Q_{e} $, magnetic charge $ Q_{m} $ and asymptotic values of the dilaton $ \phi_{0} $. We also mmake some comparisons b... |
1508.01510 | Harald Skarke | Harald Skarke | Cosmic Acceleration as an Optical Illusion | 34 pages, 7 figures; v2: references added; v3: stronger
modifications, particularly in the discussion section concerning the
reliability of results | null | null | TUW-15-14 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider light propagation in an inhomogeneous irrotational dust universe
with vanishing cosmological constant, with initial conditions as in standard
linear perturbation theory. A non-perturbative approach to the dynamics of such
a universe is combined with a distance formula based on the Sachs optical
equations.... | [
{
"created": "Thu, 6 Aug 2015 12:19:45 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Aug 2015 11:13:49 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Sep 2016 12:45:07 GMT",
"version": "v3"
}
] | 2016-09-30 | [
[
"Skarke",
"Harald",
""
]
] | We consider light propagation in an inhomogeneous irrotational dust universe with vanishing cosmological constant, with initial conditions as in standard linear perturbation theory. A non-perturbative approach to the dynamics of such a universe is combined with a distance formula based on the Sachs optical equations. T... |
1011.2036 | Li Zhengxiang | Zhengxiang Li, Puxun Wu, Hongwei Yu | Probing the course of cosmic expansion with a combination of
observational data | 19 pages, 6 figures, accepted for publication in JCAP | JCAP 1011:031,2010 | 10.1088/1475-7516/2010/11/031 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the cosmic expansion history by reconstructing the deceleration
parameter $q(z)$ from the SDSS-II type Ia supernova sample (SNIa) with two
different light curve fits (MLCS2k2 and SALT-II), the baryon acoustic
oscillation (BAO) distance ratio, the cosmic microwave background (CMB) shift
parameter, and the loo... | [
{
"created": "Tue, 9 Nov 2010 10:49:21 GMT",
"version": "v1"
}
] | 2011-05-10 | [
[
"Li",
"Zhengxiang",
""
],
[
"Wu",
"Puxun",
""
],
[
"Yu",
"Hongwei",
""
]
] | We study the cosmic expansion history by reconstructing the deceleration parameter $q(z)$ from the SDSS-II type Ia supernova sample (SNIa) with two different light curve fits (MLCS2k2 and SALT-II), the baryon acoustic oscillation (BAO) distance ratio, the cosmic microwave background (CMB) shift parameter, and the lookb... |
1803.10066 | Jian-Yang Zhu | Yang-Yang Wang, Jian-Yang Zhu and Xiao-Min Zhang | Two-field Warm Inflation and Its Scalar Perturbations on Large Scales | 10 pages, 4 figures | Phys. Rev. D 97, 063510 (2018) | 10.1103/PhysRevD.97.063510 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the homogeneous background dynamics and the evolution of generated
perturbations of cosmological inflation that is driven by multiple scalar
fields interacting with a perfect fluid.Then we apply the method to warm
inflation driven by two scalar fields and a radiation fluid, and present
general results abou... | [
{
"created": "Tue, 27 Mar 2018 13:31:08 GMT",
"version": "v1"
}
] | 2018-04-04 | [
[
"Wang",
"Yang-Yang",
""
],
[
"Zhu",
"Jian-Yang",
""
],
[
"Zhang",
"Xiao-Min",
""
]
] | We explore the homogeneous background dynamics and the evolution of generated perturbations of cosmological inflation that is driven by multiple scalar fields interacting with a perfect fluid.Then we apply the method to warm inflation driven by two scalar fields and a radiation fluid, and present general results about ... |
gr-qc/0403108 | Mehmet Cem Calik | M. Arik and M. C. Calik | Primordial and asymptotic inflation in Brans-Dicke cosmology | 7 pages, no figures | JCAP 0501 (2005) 013 | 10.1088/1475-7516/2005/01/013 | null | gr-qc | null | The basic motivation of this work is to attempt to explain the rapid
primordial inflation and the observed slow late-time inflation by using the
Brans-Dicke theory of gravity. We show that the ratio of these two inflation
parameters is proportional to the square root of the Brans-Dicke parameter $%
\omega$ $(\omega\g... | [
{
"created": "Fri, 26 Mar 2004 16:06:57 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2005 20:36:35 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Arik",
"M.",
""
],
[
"Calik",
"M. C.",
""
]
] | The basic motivation of this work is to attempt to explain the rapid primordial inflation and the observed slow late-time inflation by using the Brans-Dicke theory of gravity. We show that the ratio of these two inflation parameters is proportional to the square root of the Brans-Dicke parameter $% \omega$ $(\omega\gg1... |
1903.00287 | Haruka Suzuki | Haruka Suzuki, Priti Gupta, Hirotada Okawa and Kei-ichi Maeda | Cumulative Shift of Periastron Time of Binary Pulsar with Kozai-Lidov
Oscillation | 6 pages, 3 figures, accepted by MNRAS letters | null | 10.1093/mnrasl/slz058 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a hierarchical triple system with the Kozai-Lidov mechanism, and
analyse the cumulative shift of periastron time of a binary pulsar by the
emission of gravitational waves. Time evolution of the osculating orbital
elements of the triple system is calculated by directly integrating the
first-order post-Newtoni... | [
{
"created": "Fri, 1 Mar 2019 13:28:16 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Apr 2019 14:44:26 GMT",
"version": "v2"
}
] | 2019-05-08 | [
[
"Suzuki",
"Haruka",
""
],
[
"Gupta",
"Priti",
""
],
[
"Okawa",
"Hirotada",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We study a hierarchical triple system with the Kozai-Lidov mechanism, and analyse the cumulative shift of periastron time of a binary pulsar by the emission of gravitational waves. Time evolution of the osculating orbital elements of the triple system is calculated by directly integrating the first-order post-Newtonian... |
2303.08183 | Andrea Maselli | Enzo Figueiredo, Andrea Maselli, Vitor Cardoso | Black holes surrounded by generic dark matter profiles: appearance and
gravitational-wave emission | 8 pages, 5 figures | null | 10.1103/PhysRevD.107.104033 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a numerical approach to find asymptotically flat black hole
solutions coupled to anisotropic fluids, described by generic density profiles.
Our model allows for a variety of applications in realistic astrophysical
scenarios, and is potentially able to describe the geometry of galaxies hosting
supermassive ... | [
{
"created": "Tue, 14 Mar 2023 19:00:02 GMT",
"version": "v1"
}
] | 2023-05-24 | [
[
"Figueiredo",
"Enzo",
""
],
[
"Maselli",
"Andrea",
""
],
[
"Cardoso",
"Vitor",
""
]
] | We develop a numerical approach to find asymptotically flat black hole solutions coupled to anisotropic fluids, described by generic density profiles. Our model allows for a variety of applications in realistic astrophysical scenarios, and is potentially able to describe the geometry of galaxies hosting supermassive bl... |
2112.14777 | Giovanni Maria Tomaselli | Daniel Baumann, Gianfranco Bertone, John Stout, and Giovanni Maria
Tomaselli | Ionization of Gravitational Atoms | 34+21 pages, 16 figures | null | 10.1103/PhysRevD.105.115036 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superradiant instabilities may create clouds of ultralight bosons around
rotating black holes, forming so-called "gravitational atoms." It was recently
shown that the presence of a binary companion can induce resonant transitions
between bound states of these clouds, whose backreaction on the binary's orbit
leads to ... | [
{
"created": "Wed, 29 Dec 2021 19:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Jun 2022 09:29:40 GMT",
"version": "v2"
}
] | 2022-07-13 | [
[
"Baumann",
"Daniel",
""
],
[
"Bertone",
"Gianfranco",
""
],
[
"Stout",
"John",
""
],
[
"Tomaselli",
"Giovanni Maria",
""
]
] | Superradiant instabilities may create clouds of ultralight bosons around rotating black holes, forming so-called "gravitational atoms." It was recently shown that the presence of a binary companion can induce resonant transitions between bound states of these clouds, whose backreaction on the binary's orbit leads to ch... |
2109.00247 | Abolhassan Mohammadi | Abolhassan Mohammadi | Holographic warm inflation | 9 pages, 5 figures | null | 10.1103/PhysRevD.104.123538 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The increasing interest in studying the role of holographic dark energy in
the evolution of the very early universe motivates us to study it for the
scenario of warm inflation. Due to this scenario, the holographic dark energy,
which now drives inflation, has an interaction with the radiation. The case of
interacting... | [
{
"created": "Wed, 1 Sep 2021 08:36:21 GMT",
"version": "v1"
}
] | 2022-01-05 | [
[
"Mohammadi",
"Abolhassan",
""
]
] | The increasing interest in studying the role of holographic dark energy in the evolution of the very early universe motivates us to study it for the scenario of warm inflation. Due to this scenario, the holographic dark energy, which now drives inflation, has an interaction with the radiation. The case of interacting d... |
gr-qc/0202098 | D. V. Ahluwalia | D. V. Ahluwalia (Zacatecas) | At the interface of quantum and gravitational realms | Invited talk presented at "Mexican meeting on mathematical and
experimental physics (Colegio Nacional, 10-14 IX 2001)." 8 pages, 37
references | null | null | null | gr-qc astro-ph hep-ph hep-th | null | In this talk I review a series of recent conceptual developments at the
interface of the quantum and gravitational realms. Wherever possible, I comment
on the possibility to probe the interface experimentally. It is concluded that
the underlying spacetime for a quantum theory of gravity must be
non-commutative, that ... | [
{
"created": "Wed, 27 Feb 2002 23:34:01 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ahluwalia",
"D. V.",
"",
"Zacatecas"
]
] | In this talk I review a series of recent conceptual developments at the interface of the quantum and gravitational realms. Wherever possible, I comment on the possibility to probe the interface experimentally. It is concluded that the underlying spacetime for a quantum theory of gravity must be non-commutative, that wa... |
gr-qc/9605014 | Andrew M. Abrahams | A. Abrahams, A. Anderson, Y. Choquet-Bruhat and J.W. York Jr | Geometrical Hyperbolic Systems for General Relativity and Gauge Theories | 24 pages, latex, no figures | Class.Quant.Grav.14:A9-A22,1997 | 10.1088/0264-9381/14/1A/002 | IFP-UNC-516, TAR-UNC-053 | gr-qc | null | The evolution equations of Einstein's theory and of Maxwell's theory---the
latter used as a simple model to illustrate the former--- are written in gauge
covariant first order symmetric hyperbolic form with only physically natural
characteristic directions and speeds for the dynamical variables. Quantities
representi... | [
{
"created": "Wed, 8 May 1996 20:14:27 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Abrahams",
"A.",
""
],
[
"Anderson",
"A.",
""
],
[
"Choquet-Bruhat",
"Y.",
""
],
[
"York",
"J. W.",
"Jr"
]
] | The evolution equations of Einstein's theory and of Maxwell's theory---the latter used as a simple model to illustrate the former--- are written in gauge covariant first order symmetric hyperbolic form with only physically natural characteristic directions and speeds for the dynamical variables. Quantities representing... |
1606.00910 | Mohammad Ali Gorji | M. A. Gorji, K. Nozari, B. Vakili | Gravity's rainbow: a bridge between LQC and DSR | 10 pages, 4 figures, Refs. added | Phys. Lett. B 765 (2017) 113 | 10.1016/j.physletb.2016.12.023 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The doubly special relativity (DSR) theories are investigated in order to
take into account an observer-independent length scale in special relativity
framework. It is widely believed that any quantum theory of gravity would
reduce to a DSR model at the flat limit when purely gravitational and quantum
mechanical effe... | [
{
"created": "Thu, 2 Jun 2016 21:47:50 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Aug 2016 11:30:53 GMT",
"version": "v2"
}
] | 2016-12-20 | [
[
"Gorji",
"M. A.",
""
],
[
"Nozari",
"K.",
""
],
[
"Vakili",
"B.",
""
]
] | The doubly special relativity (DSR) theories are investigated in order to take into account an observer-independent length scale in special relativity framework. It is widely believed that any quantum theory of gravity would reduce to a DSR model at the flat limit when purely gravitational and quantum mechanical effect... |
0910.5128 | Yu Zhang | Wang Chun-Yan, Zhang Yu, Gui Yuan-Xing, Lu Jian-Bo | Quasinormal modes of Dirac field perturbation in Reissner-Nordstr\"{o}m
black hole surrounded by quintessence | 12pages, 11 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dirac quasinormal modes of the Reissner-Nordstr\"om black hole surrounded
by quintessence are investigated using the third WKB approximation. We find
that the magnitude of the imaginary part of the quasinormal mode frequencies
increases firstly and then decreases as the charge $Q$ increases, but it
decreases as t... | [
{
"created": "Tue, 27 Oct 2009 14:07:30 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Oct 2009 12:18:07 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Chun-Yan",
"Wang",
""
],
[
"Yu",
"Zhang",
""
],
[
"Yuan-Xing",
"Gui",
""
],
[
"Jian-Bo",
"Lu",
""
]
] | The dirac quasinormal modes of the Reissner-Nordstr\"om black hole surrounded by quintessence are investigated using the third WKB approximation. We find that the magnitude of the imaginary part of the quasinormal mode frequencies increases firstly and then decreases as the charge $Q$ increases, but it decreases as the... |
gr-qc/0612006 | George Sparling | George Sparling | The Xi-transform for conformally flat space-time | 51 pages | null | null | null | gr-qc | null | The Xi-transform is a new spinor transform arising naturally in Einstein's
general relativity. Here the example of conformally flat space-time is
discussed in detail. In particular it is shown that for this case, the
transform coincides with two other naturally defined transforms: one a
two-variable transform on the ... | [
{
"created": "Fri, 1 Dec 2006 03:22:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sparling",
"George",
""
]
] | The Xi-transform is a new spinor transform arising naturally in Einstein's general relativity. Here the example of conformally flat space-time is discussed in detail. In particular it is shown that for this case, the transform coincides with two other naturally defined transforms: one a two-variable transform on the Li... |
gr-qc/0209103 | Daniel Muller | D. Muller, H. V. Fagundes, R. Opher | Casimir energy in multiply connected static hyperbolic Universes | accepted for publication | Phys.Rev. D66 (2002) 083507 | 10.1103/PhysRevD.66.083507 | null | gr-qc | null | We generalize a previously obtained result, for the case of a few other
static hyperbolic universes with manifolds of nontrivial topology as spatial
sections.
| [
{
"created": "Thu, 26 Sep 2002 21:30:07 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Muller",
"D.",
""
],
[
"Fagundes",
"H. V.",
""
],
[
"Opher",
"R.",
""
]
] | We generalize a previously obtained result, for the case of a few other static hyperbolic universes with manifolds of nontrivial topology as spatial sections. |
0906.2367 | Gary T. Horowitz | Aaron J. Amsel, Gary T. Horowitz, Donald Marolf, and Matthew M.
Roberts | Uniqueness of Extremal Kerr and Kerr-Newman Black Holes | 12 pages, v2: important references to earlier work added, v3: minor
clarifications | Phys.Rev.D81:024033,2010 | 10.1103/PhysRevD.81.024033 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that the only four dimensional, stationary, rotating, asymptotically
flat (analytic) vacuum black hole with a single degenerate horizon is given by
the extremal Kerr solution. We also prove a similar uniqueness theorem for the
extremal Kerr-Newman solution. This closes a longstanding gap in the black hole
un... | [
{
"created": "Fri, 12 Jun 2009 18:07:52 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Jun 2009 21:19:27 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Nov 2009 19:42:07 GMT",
"version": "v3"
}
] | 2010-04-06 | [
[
"Amsel",
"Aaron J.",
""
],
[
"Horowitz",
"Gary T.",
""
],
[
"Marolf",
"Donald",
""
],
[
"Roberts",
"Matthew M.",
""
]
] | We prove that the only four dimensional, stationary, rotating, asymptotically flat (analytic) vacuum black hole with a single degenerate horizon is given by the extremal Kerr solution. We also prove a similar uniqueness theorem for the extremal Kerr-Newman solution. This closes a longstanding gap in the black hole uniq... |
1712.03054 | S\'ergio Mittmann dos Santos | S. Mittmann dos Santos, J. M. Hoff da Silva, M. E. X. Guimar\~aes, J.
L. Neto | A nearly cylindrically symmetric source in the Brans-Dicke gravity as
the generator of the rotational curves of the galaxies | 24 pages, 4 figures, accepted for publication in Eur. Phys. J. C | Eur. Phys. J. C 77, 848 (2017) | 10.1140/epjc/s10052-017-5397-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Observation shows that the velocities of stars grow by approximately 2 to 3
orders of magnitude when the distances from the centers of the galaxies are in
the range of $0.5$ kpc to $82.3$ kpc, before they begin to tend to a constant
value. Up to know, the reason for this behavior is still a matter for debate.
In this... | [
{
"created": "Fri, 8 Dec 2017 13:32:18 GMT",
"version": "v1"
}
] | 2022-09-07 | [
[
"Santos",
"S. Mittmann dos",
""
],
[
"da Silva",
"J. M. Hoff",
""
],
[
"Guimarães",
"M. E. X.",
""
],
[
"Neto",
"J. L.",
""
]
] | Observation shows that the velocities of stars grow by approximately 2 to 3 orders of magnitude when the distances from the centers of the galaxies are in the range of $0.5$ kpc to $82.3$ kpc, before they begin to tend to a constant value. Up to know, the reason for this behavior is still a matter for debate. In this w... |
0906.5219 | Boris Kosyakov | Andrew E. Chubykalo, Augusto Espinoza, B. P. Kosyakov | Inertial frames of reference, space and time measurements, and physical
principles of special relativity revisited | LaTeX, 17 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a critical analysis of the conceptual foundations of special
relativity. We formulate a simple operational criterion for distinguishing
between noninertial and inertial frames which is introduced prior to geometry.
We associate the concept of maximal velocity with the existence of an upper
bound for a set of ... | [
{
"created": "Mon, 29 Jun 2009 08:22:35 GMT",
"version": "v1"
}
] | 2009-06-30 | [
[
"Chubykalo",
"Andrew E.",
""
],
[
"Espinoza",
"Augusto",
""
],
[
"Kosyakov",
"B. P.",
""
]
] | We give a critical analysis of the conceptual foundations of special relativity. We formulate a simple operational criterion for distinguishing between noninertial and inertial frames which is introduced prior to geometry. We associate the concept of maximal velocity with the existence of an upper bound for a set of ra... |
1301.6650 | Ion I. Cotaescu | Ion I. Cotaescu | How to kill the Unruh effect | 13 pages no figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | How to kill the Unruh effect? Very simple, by requiring the Rindler
transformation to behave continuously for vanishing acceleration. Then the
Unruh effect disappears as we show in the case of the massive scalar quantum
field. The main point is that the continuity condition restricts the integral
of the mode expansio... | [
{
"created": "Mon, 28 Jan 2013 19:24:21 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jan 2013 07:30:34 GMT",
"version": "v2"
},
{
"created": "Thu, 31 Jan 2013 16:32:02 GMT",
"version": "v3"
},
{
"created": "Wed, 6 Feb 2013 14:50:58 GMT",
"version": "v4"
}
] | 2013-02-07 | [
[
"Cotaescu",
"Ion I.",
""
]
] | How to kill the Unruh effect? Very simple, by requiring the Rindler transformation to behave continuously for vanishing acceleration. Then the Unruh effect disappears as we show in the case of the massive scalar quantum field. The main point is that the continuity condition restricts the integral of the mode expansion ... |
gr-qc/0307006 | Peter Dimitris Rippis | Oyvind Gron, Peter D. Rippis | Singular shell embedded into a cosmological model | 25 pages, 2 figures | Gen.Rel.Grav.35:2189-2215,2003 | 10.1023/A:1027353707603 | null | gr-qc astro-ph | null | We generalize Israel's formalism to cover singular shells embedded in a
non-vacuum Universe. That is, we deduce the relativistic equation of motion for
a thin shell embedded in a Schwarzschild/Friedmann-Lemaitre-Robertson-Walker
spacetime. Also, we review the embedding of a Schwarzschild mass into a
cosmological mode... | [
{
"created": "Tue, 1 Jul 2003 15:40:55 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jul 2003 15:10:31 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Nov 2003 10:36:16 GMT",
"version": "v3"
}
] | 2011-07-19 | [
[
"Gron",
"Oyvind",
""
],
[
"Rippis",
"Peter D.",
""
]
] | We generalize Israel's formalism to cover singular shells embedded in a non-vacuum Universe. That is, we deduce the relativistic equation of motion for a thin shell embedded in a Schwarzschild/Friedmann-Lemaitre-Robertson-Walker spacetime. Also, we review the embedding of a Schwarzschild mass into a cosmological model ... |
0711.1048 | Piotr Jaranowski | Thibault Damour, Piotr Jaranowski, Gerhard Sch\"afer | Hamiltonian of two spinning compact bodies with next-to-leading order
gravitational spin-orbit coupling | Few minor corrections made, 2 references added, some misprints
removed | Phys.Rev.D77:064032,2008 | 10.1103/PhysRevD.77.064032 | null | gr-qc | null | A Hamiltonian formulation is given for the gravitational dynamics of two
spinning compact bodies to next-to-leading order ($G/c^4$ and $G^2/c^4$) in the
spin-orbit interaction. We use a novel approach (valid to linear order in the
spins), which starts from the second-post-Newtonian metric (in ADM coordinates)
generat... | [
{
"created": "Wed, 7 Nov 2007 10:01:22 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Apr 2008 15:37:45 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Damour",
"Thibault",
""
],
[
"Jaranowski",
"Piotr",
""
],
[
"Schäfer",
"Gerhard",
""
]
] | A Hamiltonian formulation is given for the gravitational dynamics of two spinning compact bodies to next-to-leading order ($G/c^4$ and $G^2/c^4$) in the spin-orbit interaction. We use a novel approach (valid to linear order in the spins), which starts from the second-post-Newtonian metric (in ADM coordinates) generated... |
0806.4459 | Francisco Lobo | Jos\'e P. S. Lemos, Francisco S. N. Lobo | Plane symmetric thin-shell wormholes: solutions and stability | 10 pages, 4 figures. V2: typo corrections and minor modifications | Phys.Rev.D78:044030,2008 | 10.1103/PhysRevD.78.044030 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the cut-and-paste procedure, we construct static and dynamic plane
symmetric wormholes by surgically grafting together two spacetimes of plane
symmetric vacuum solutions with a negative cosmological constant. These plane
symmetric wormholes may be viewed as domain walls connecting different
universes, having pl... | [
{
"created": "Fri, 27 Jun 2008 08:45:51 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Aug 2008 17:13:24 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lemos",
"José P. S.",
""
],
[
"Lobo",
"Francisco S. N.",
""
]
] | Using the cut-and-paste procedure, we construct static and dynamic plane symmetric wormholes by surgically grafting together two spacetimes of plane symmetric vacuum solutions with a negative cosmological constant. These plane symmetric wormholes may be viewed as domain walls connecting different universes, having plan... |
1302.6075 | Cosimo Bambi | Cosimo Bambi, Leonardo Modesto | Rotating regular black holes | 8 pages, 3 figures. v2: refereed version | Phys.Lett.B721:329-334,2013 | 10.1016/j.physletb.2013.03.025 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The formation of spacetime singularities is a quite common phenomenon in
General Relativity and it is regulated by specific theorems. It is widely
believed that spacetime singularities do not exist in Nature, but that they
represent a limitation of the classical theory. While we do not yet have any
solid theory of qu... | [
{
"created": "Mon, 25 Feb 2013 12:29:05 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Mar 2013 14:31:07 GMT",
"version": "v2"
}
] | 2013-04-08 | [
[
"Bambi",
"Cosimo",
""
],
[
"Modesto",
"Leonardo",
""
]
] | The formation of spacetime singularities is a quite common phenomenon in General Relativity and it is regulated by specific theorems. It is widely believed that spacetime singularities do not exist in Nature, but that they represent a limitation of the classical theory. While we do not yet have any solid theory of quan... |
2112.00938 | Krishnakanta Bhattacharya | Krishnakanta Bhattacharya | Extended phase space thermodynamics of black holes: A study in
Einstein's gravity and beyond | Modified version, To appear in NPB | Nuclear Physics B 989 (2023) 116130 | 10.1016/j.nuclphysb.2023.116130 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the extended phase space approach, one can define thermodynamic pressure
and volume that gives rise to the van der Waals type phase transition for black
holes. For Einstein's GR, the expressions of these quantities are unanimously
accepted. Of late, the van der Waals phase transition in black holes has been
found ... | [
{
"created": "Thu, 2 Dec 2021 02:24:28 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Feb 2023 10:38:05 GMT",
"version": "v2"
}
] | 2023-03-01 | [
[
"Bhattacharya",
"Krishnakanta",
""
]
] | In the extended phase space approach, one can define thermodynamic pressure and volume that gives rise to the van der Waals type phase transition for black holes. For Einstein's GR, the expressions of these quantities are unanimously accepted. Of late, the van der Waals phase transition in black holes has been found in... |
2004.09598 | Robie Hennigar | Connor Adair, Pablo Bueno, Pablo A. Cano, Robie A. Hennigar, Robert B.
Mann | Slowly rotating black holes in Einsteinian cubic gravity | 39 pages, 14 figures | Phys. Rev. D 102, 084001 (2020) | 10.1103/PhysRevD.102.084001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct slowly rotating black-hole solutions of Einsteinian cubic
gravity (ECG) in four dimensions with flat and AdS asymptotes. At leading order
in the rotation parameter, the only modification with respect to the static
case is the appearance of a non-vanishing $g_{t\phi}$ component. Similarly to
the static ca... | [
{
"created": "Mon, 20 Apr 2020 19:45:29 GMT",
"version": "v1"
}
] | 2020-10-07 | [
[
"Adair",
"Connor",
""
],
[
"Bueno",
"Pablo",
""
],
[
"Cano",
"Pablo A.",
""
],
[
"Hennigar",
"Robie A.",
""
],
[
"Mann",
"Robert B.",
""
]
] | We construct slowly rotating black-hole solutions of Einsteinian cubic gravity (ECG) in four dimensions with flat and AdS asymptotes. At leading order in the rotation parameter, the only modification with respect to the static case is the appearance of a non-vanishing $g_{t\phi}$ component. Similarly to the static case... |
2112.02835 | Motohiko Yoshimura | M. Yoshimura | Bifurcated symmetry breaking in scalar-tensor gravity | 14 pages and 3 figures | null | 10.1103/PhysRevD.105.083522 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We present models that simultaneously predict presence of dark energy and
cold dark matter along with slow-roll inflation. The dark energy density is
found to be of order $({\rm a \;few \;meV})^4$, and the mass of dark matter
constituent is $\approx 1\,$ meV. These numbers are given in terms of the
present value of H... | [
{
"created": "Mon, 6 Dec 2021 07:47:31 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Dec 2021 09:02:49 GMT",
"version": "v2"
}
] | 2022-05-04 | [
[
"Yoshimura",
"M.",
""
]
] | We present models that simultaneously predict presence of dark energy and cold dark matter along with slow-roll inflation. The dark energy density is found to be of order $({\rm a \;few \;meV})^4$, and the mass of dark matter constituent is $\approx 1\,$ meV. These numbers are given in terms of the present value of Hub... |
2009.06113 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou, F.P. Fronimos, S.A. Venikoudis | GW170817-compatible Constant-roll Einstein-Gauss-Bonnet Inflation and
Non-Gaussianities | PDU Accepted | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the inflationary phenomenology of an
Einstein-Gauss-Bonnet theory compatible with the GW170817 event, by imposing
the constant-roll evolution on the scalar field. We develop the constant-roll
GW170817-compatible Einstein-Gauss-Bonnet formalism, and we calculate the
slow-roll indices and t... | [
{
"created": "Sun, 13 Sep 2020 23:29:54 GMT",
"version": "v1"
}
] | 2020-09-15 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
],
[
"Fronimos",
"F. P.",
""
],
[
"Venikoudis",
"S. A.",
""
]
] | In this paper we investigate the inflationary phenomenology of an Einstein-Gauss-Bonnet theory compatible with the GW170817 event, by imposing the constant-roll evolution on the scalar field. We develop the constant-roll GW170817-compatible Einstein-Gauss-Bonnet formalism, and we calculate the slow-roll indices and the... |
2009.03866 | Vesselin G. Gueorguiev | Vesselin G. Gueorguiev and Andre Maeder | Revisiting the Cosmological Constant Problem within Quantum Cosmology | 16 pages, no figures | Universe 2020, Volume 6, Issue 8, Article 108 | 10.3390/universe6080108 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new perspective on the Cosmological Constant Problem (CCP) is proposed and
discussed within the multiverse approach of Quantum Cosmology. It is assumed
that each member of the ensemble of universes has a characteristic scale $a$
that can be used as integration variable in the partition function. An averaged
charact... | [
{
"created": "Tue, 8 Sep 2020 17:06:27 GMT",
"version": "v1"
}
] | 2020-09-09 | [
[
"Gueorguiev",
"Vesselin G.",
""
],
[
"Maeder",
"Andre",
""
]
] | A new perspective on the Cosmological Constant Problem (CCP) is proposed and discussed within the multiverse approach of Quantum Cosmology. It is assumed that each member of the ensemble of universes has a characteristic scale $a$ that can be used as integration variable in the partition function. An averaged character... |
2312.13858 | Alexey Golovnev | Alexey Golovnev | Geometry of teleparallel theories | 8 pages; a remark added; prepared for proceedings of the
International Conference on Particle Physics and Cosmology dedicated to
memory of Valery Rubakov, Yerevan, Armenia, October 2023 | Proceedings of Science, PoS ICPPCRubakov2023 (2024) 031 | 10.22323/1.455.0031 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I give a brief introduction to and explain the geometry of teleparallel
models of modified gravity. In particular I explain why, in my opinion, the
covariantised approaches are not needed and the Weitzenb\"ock connection is the
most natural representation of the parallel transport structure. An interesting
point is t... | [
{
"created": "Thu, 21 Dec 2023 13:53:48 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Dec 2023 19:16:36 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Jan 2024 11:06:15 GMT",
"version": "v3"
}
] | 2024-06-12 | [
[
"Golovnev",
"Alexey",
""
]
] | I give a brief introduction to and explain the geometry of teleparallel models of modified gravity. In particular I explain why, in my opinion, the covariantised approaches are not needed and the Weitzenb\"ock connection is the most natural representation of the parallel transport structure. An interesting point is tha... |
2211.12188 | Zhao Li | Zhao Li, Jin Qiao, Tan Liu, Tao Zhu, Wen Zhao | Gravitational Waveform and Polarization from Binary Black Hole Inspiral
in Dynamical Chern-Simons Gravity: From Generation to Propagation | 30 pages | https://iopscience.iop.org/article/10.1088/1475-7516/2023/04/006 | 10.1088/1475-7516/2023/04/006 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We calculate the gravitational waveform radiated from spinning black holes
(BHs) binary in dynamical Chern-Simons (dCS) gravity. The equation of motion
(EOM) of the spinining binary BHs is derived based on the modified
Mathisson-Papapetrou-Dixon equation for the spin-aligned circular orbits. The
leading-order effects... | [
{
"created": "Tue, 22 Nov 2022 11:28:02 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Apr 2023 06:50:12 GMT",
"version": "v2"
}
] | 2023-04-07 | [
[
"Li",
"Zhao",
""
],
[
"Qiao",
"Jin",
""
],
[
"Liu",
"Tan",
""
],
[
"Zhu",
"Tao",
""
],
[
"Zhao",
"Wen",
""
]
] | We calculate the gravitational waveform radiated from spinning black holes (BHs) binary in dynamical Chern-Simons (dCS) gravity. The equation of motion (EOM) of the spinining binary BHs is derived based on the modified Mathisson-Papapetrou-Dixon equation for the spin-aligned circular orbits. The leading-order effects i... |
1710.01172 | Orfeu Bertolami | P. Leal, A. E. Bernardini, O. Bertolami | Collapsing Shells and Black Holes: a quantum analysis | 26 pages, 5 figs | null | 10.1088/1361-6382/aac083 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantization of a spherically symmetric null shells is performed and
extended to the framework of phase-space noncommutative (NC) quantum mechanics.
The encountered properties are investigated making use of the Israel junction
conditions on the shell, considering that it is the boundary between two
spherically sy... | [
{
"created": "Tue, 3 Oct 2017 14:05:08 GMT",
"version": "v1"
}
] | 2018-06-13 | [
[
"Leal",
"P.",
""
],
[
"Bernardini",
"A. E.",
""
],
[
"Bertolami",
"O.",
""
]
] | The quantization of a spherically symmetric null shells is performed and extended to the framework of phase-space noncommutative (NC) quantum mechanics. The encountered properties are investigated making use of the Israel junction conditions on the shell, considering that it is the boundary between two spherically symm... |
1706.06519 | Puttarak Jai-akson | Puttarak Jai-akson, Auttakit Chatrabhuti, Oleg Evnin, Luis Lehner | Black hole merger estimates in Einstein-Maxwell and
Einstein-Maxwell-dilaton gravity | 23 pages, 23 figures, v2: minor improvements, accepted to PRD | Phys. Rev. D 96, 044031 (2017) | 10.1103/PhysRevD.96.044031 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent birth of gravitational wave astronomy invites a new generation of
precision tests of general relativity. Signatures of black hole (BH) mergers
must be systematically explored in a wide spectrum of modified gravity
theories. Here, we turn to one such theory in which the initial value problem
for BH mergers ... | [
{
"created": "Tue, 20 Jun 2017 15:29:38 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Aug 2017 15:43:12 GMT",
"version": "v2"
}
] | 2017-09-01 | [
[
"Jai-akson",
"Puttarak",
""
],
[
"Chatrabhuti",
"Auttakit",
""
],
[
"Evnin",
"Oleg",
""
],
[
"Lehner",
"Luis",
""
]
] | The recent birth of gravitational wave astronomy invites a new generation of precision tests of general relativity. Signatures of black hole (BH) mergers must be systematically explored in a wide spectrum of modified gravity theories. Here, we turn to one such theory in which the initial value problem for BH mergers is... |
gr-qc/9506032 | Kouji Nakamura | K.Nakamura, Y.Oshiro and A.Tomimatsu | Quantum Formation of Black Hole and Wormhole in Gravitational Collapse
of a Dust Shell | 10 pages in twocolumn, 8 figures, RevTeX 3.0 | Phys.Rev.D53:4356-4365,1996 | 10.1103/PhysRevD.53.4356 | null | gr-qc | null | Quantum-mechanical model of self-gravitating dust shell is considered. To
clarify the relation between classical and quantum spacetime which the shell
collapse form, we consider various time slicing on which quantum mechanics is
developed. By considering the static time slicing which corresponds to an
observer at a c... | [
{
"created": "Sat, 17 Jun 1995 09:11:00 GMT",
"version": "v1"
}
] | 2011-09-09 | [
[
"Nakamura",
"K.",
""
],
[
"Oshiro",
"Y.",
""
],
[
"Tomimatsu",
"A.",
""
]
] | Quantum-mechanical model of self-gravitating dust shell is considered. To clarify the relation between classical and quantum spacetime which the shell collapse form, we consider various time slicing on which quantum mechanics is developed. By considering the static time slicing which corresponds to an observer at a con... |
0704.3140 | Farook Rahaman | Farook Rahaman | Non static cosmic strings in Lyra geometry | 8 pages, Published in Nuovo Cim.118B:99-105,2003 | null | null | null | gr-qc | null | The gravitational field of both local and global non static cosmic strings in
the context of Lyra geometry are investigated. Local strings are characterized
by having an energy momentum tensor whose only non null components are $T_{tt}
= T_{zz}$ . As linearized Einstein equations are formally analogous to the
Maxwell... | [
{
"created": "Tue, 24 Apr 2007 08:09:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rahaman",
"Farook",
""
]
] | The gravitational field of both local and global non static cosmic strings in the context of Lyra geometry are investigated. Local strings are characterized by having an energy momentum tensor whose only non null components are $T_{tt} = T_{zz}$ . As linearized Einstein equations are formally analogous to the Maxwell e... |
gr-qc/0303006 | Mu-Lin Yan | Hua Bai, Mu-Lin Yan | Remarks on 't Hooft's Brick Wall Model | RevTeX, 5 pages, no figures | JHEP0307:058,2003 | 10.1088/1126-6708/2003/07/058 | USTC-ICTS-03-6 | gr-qc hep-th | null | A semi-classical reasoning leads to the non-commutativity of the space and
time coordinates near the horizon of Schwarzschild black hole. This
non-commutativity in turn provides a mechanism to interpret the brick wall
thickness hypothesis in 't Hooft's brick wall model as well as the boundary
condition imposed for th... | [
{
"created": "Mon, 3 Mar 2003 02:51:33 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Apr 2003 02:53:22 GMT",
"version": "v2"
},
{
"created": "Fri, 25 Jul 2003 02:42:15 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Bai",
"Hua",
""
],
[
"Yan",
"Mu-Lin",
""
]
] | A semi-classical reasoning leads to the non-commutativity of the space and time coordinates near the horizon of Schwarzschild black hole. This non-commutativity in turn provides a mechanism to interpret the brick wall thickness hypothesis in 't Hooft's brick wall model as well as the boundary condition imposed for the ... |
1512.07109 | Kirill Krasnov | Joel Fine, Yannick Herfray, Kirill Krasnov and Carlos Scarinci | Asymptotically hyperbolic connections | 25 pages, no figures | Classical and Quantum Gravity 33 (2016), no 18, 25pp | 10.1088/0264-9381/33/18/185011 | null | gr-qc hep-th math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General Relativity in 4 dimensions can be equivalently described as a
dynamical theory of SO(3)-connections rather than metrics. We introduce the
notion of asymptotically hyperbolic connections, and work out an analog of the
Fefferman-Graham expansion in the language of connections. As in the metric
setup, one can so... | [
{
"created": "Tue, 22 Dec 2015 14:57:49 GMT",
"version": "v1"
}
] | 2017-03-24 | [
[
"Fine",
"Joel",
""
],
[
"Herfray",
"Yannick",
""
],
[
"Krasnov",
"Kirill",
""
],
[
"Scarinci",
"Carlos",
""
]
] | General Relativity in 4 dimensions can be equivalently described as a dynamical theory of SO(3)-connections rather than metrics. We introduce the notion of asymptotically hyperbolic connections, and work out an analog of the Fefferman-Graham expansion in the language of connections. As in the metric setup, one can solv... |
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