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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2111.10540 | Vahid Kamali | Vahid Kamali, Saeid Ebrahimi and Asma Alaei | Intermediate Class of Warm Pseudoscalar Inflation | Published by EPJC | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | High dissipative regime of warm pseudoscalar inflation model
\cite{Kamali:2019ppi} with an approximately constant value of dissipation
parameter $Q$ is studied. { Intermediate solution of the scale-factor related
to the accelerated expansion of the Universe which is rolled out by
observational data in the context of ... | [
{
"created": "Sat, 20 Nov 2021 08:23:53 GMT",
"version": "v1"
}
] | 2021-11-23 | [
[
"Kamali",
"Vahid",
""
],
[
"Ebrahimi",
"Saeid",
""
],
[
"Alaei",
"Asma",
""
]
] | High dissipative regime of warm pseudoscalar inflation model \cite{Kamali:2019ppi} with an approximately constant value of dissipation parameter $Q$ is studied. { Intermediate solution of the scale-factor related to the accelerated expansion of the Universe which is rolled out by observational data in the context of st... |
1310.4933 | Yongjoon Kwon | Yongjoon Kwon and Soonkeon Nam | Thermodynamics from field equations for black holes with multiple
horizons | 11 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first law of black hole thermodynamics can be read off from the field
equations at the horizon. Until now, for black holes with multiple horizons the
field equations only at the outer horizon were employed with a particular
constraint. In this paper, however, we suggest that for a black hole with
multiple horizon... | [
{
"created": "Fri, 18 Oct 2013 07:41:04 GMT",
"version": "v1"
}
] | 2013-10-21 | [
[
"Kwon",
"Yongjoon",
""
],
[
"Nam",
"Soonkeon",
""
]
] | The first law of black hole thermodynamics can be read off from the field equations at the horizon. Until now, for black holes with multiple horizons the field equations only at the outer horizon were employed with a particular constraint. In this paper, however, we suggest that for a black hole with multiple horizons ... |
1212.0770 | Mario Novello | M. Novello, E. Bittencourt, U. Moschella, E. Goulart, J. M. Salim and
J. Toniato | Geometric scalar theory of gravity | We did some modifications which do not change the content of the text | null | 10.1088/1475-7516/2013/06/014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a geometric scalar theory of gravity. Our proposal will be
described using the "background field method" introduced by Gupta, Feynman and
others as a field theory formulation of general relativity. We analyze previous
criticisms against scalar gravity and show how the present proposal avoids
these difficul... | [
{
"created": "Mon, 3 Dec 2012 12:56:48 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Dec 2012 12:05:47 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Feb 2013 21:38:14 GMT",
"version": "v3"
}
] | 2015-06-12 | [
[
"Novello",
"M.",
""
],
[
"Bittencourt",
"E.",
""
],
[
"Moschella",
"U.",
""
],
[
"Goulart",
"E.",
""
],
[
"Salim",
"J. M.",
""
],
[
"Toniato",
"J.",
""
]
] | We present a geometric scalar theory of gravity. Our proposal will be described using the "background field method" introduced by Gupta, Feynman and others as a field theory formulation of general relativity. We analyze previous criticisms against scalar gravity and show how the present proposal avoids these difficulti... |
gr-qc/0308089 | Manfred Requardt | Manfred Requardt | Scale Free Small World Networks and the Structure of Quantum Space-Time | 25 pages, Latex, 3 figures | null | null | null | gr-qc cond-mat.dis-nn nlin.AO | null | We report on parallel observations in two seemingly unrelated areas of
dynamical network research. The one is the so-called small world phenomenon
and/or the observation of scale freeness in certain types of large (empirical)
networks and their theoretical analysis. The other is a discrete cellular
network approach t... | [
{
"created": "Thu, 28 Aug 2003 11:38:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Requardt",
"Manfred",
""
]
] | We report on parallel observations in two seemingly unrelated areas of dynamical network research. The one is the so-called small world phenomenon and/or the observation of scale freeness in certain types of large (empirical) networks and their theoretical analysis. The other is a discrete cellular network approach to ... |
gr-qc/0308073 | Pestov | Ivanhoe B. Pestov | Time and Energy in Gravity Theory | 22 pages, LATEX, no figures | null | null | null | gr-qc | null | A new concept of internal time (viewed as a scalar temporal field) is
introduced which allows one to solve the energy problem in General Relativity.
The law of energy conservation means that the total energy density of the full
system of interacting fields (including gravitational field) does not vary with
time, thus... | [
{
"created": "Fri, 22 Aug 2003 10:45:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pestov",
"Ivanhoe B.",
""
]
] | A new concept of internal time (viewed as a scalar temporal field) is introduced which allows one to solve the energy problem in General Relativity. The law of energy conservation means that the total energy density of the full system of interacting fields (including gravitational field) does not vary with time, thus b... |
gr-qc/0511108 | Martin Bojowald | Martin Bojowald and Rafal Swiderski | Spherically Symmetric Quantum Geometry: Hamiltonian Constraint | 33 pages | Class.Quant.Grav. 23 (2006) 2129-2154 | 10.1088/0264-9381/23/6/015 | AEI-2005-171, NI05065 | gr-qc | null | Variables adapted to the quantum dynamics of spherically symmetric models are
introduced, which further simplify the spherically symmetric volume operator
and allow an explicit computation of all matrix elements of the Euclidean and
Lorentzian Hamiltonian constraints. The construction fits completely into the
general... | [
{
"created": "Fri, 18 Nov 2005 12:47:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bojowald",
"Martin",
""
],
[
"Swiderski",
"Rafal",
""
]
] | Variables adapted to the quantum dynamics of spherically symmetric models are introduced, which further simplify the spherically symmetric volume operator and allow an explicit computation of all matrix elements of the Euclidean and Lorentzian Hamiltonian constraints. The construction fits completely into the general s... |
gr-qc/0703070 | Satoshi Okuzumi | Satoshi Okuzumi and Masa-aki Sakagami | Quasinormal ringing of acoustic black holes in Laval nozzles: Numerical
simulations | 9 pages, 8 figures, accepted for publication in Physical Review D | Phys.Rev.D76:084027,2007 | 10.1103/PhysRevD.76.084027 | null | gr-qc astro-ph physics.flu-dyn | null | Quasinormal ringing of acoustic black holes in Laval nozzles is discussed.
The equation for sounds in a transonic flow is written into a
Schr\"{o}dinger-type equation with a potential barrier, and the quasinormal
frequencies are calculated semianalytically. From the results of numerical
simulations, it is shown that ... | [
{
"created": "Tue, 13 Mar 2007 02:47:16 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Mar 2007 09:33:48 GMT",
"version": "v2"
},
{
"created": "Wed, 29 Aug 2007 03:43:33 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Okuzumi",
"Satoshi",
""
],
[
"Sakagami",
"Masa-aki",
""
]
] | Quasinormal ringing of acoustic black holes in Laval nozzles is discussed. The equation for sounds in a transonic flow is written into a Schr\"{o}dinger-type equation with a potential barrier, and the quasinormal frequencies are calculated semianalytically. From the results of numerical simulations, it is shown that th... |
1404.3231 | Thiago Pereira | R. Fresneda, M. C. Baldiotti, T. S. Pereira | Maxwell field with Torsion | 9 pages, no figures | Braz.J.Phys. 45 (2015) 353-358 | 10.1007/s13538-015-0318-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a generalizing gauge-invariant model of propagating torsion which
couples to the Maxwell field and to charged particles. As a result we have an
Abelian gauge invariant action which leads to a theory with nonzero torsion and
which is consistent with available experimental data.
| [
{
"created": "Fri, 11 Apr 2014 21:38:39 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Aug 2014 15:13:13 GMT",
"version": "v2"
}
] | 2015-05-04 | [
[
"Fresneda",
"R.",
""
],
[
"Baldiotti",
"M. C.",
""
],
[
"Pereira",
"T. S.",
""
]
] | We propose a generalizing gauge-invariant model of propagating torsion which couples to the Maxwell field and to charged particles. As a result we have an Abelian gauge invariant action which leads to a theory with nonzero torsion and which is consistent with available experimental data. |
1404.0634 | Frank Wilczek | Lawrence M. Krauss, Frank Wilczek | From B Modes to Quantum Gravity and Unification of Forces | 4 pages, no figures. v2: minor typos corrected, reference added. v3:
very minor typo corrected. Winning entry in Gravity Research Foundation essay
competition | null | 10.1142/S0218271814410016 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is commonly anticipated that gravity is subject to the standard principles
of quantum mechanics. Yet some (including Einstein) have questioned that
presumption, whose empirical basis is weak. Indeed, recently Freeman Dyson has
emphasized that no conventional experiment is capable of detecting individual
gravitons.... | [
{
"created": "Wed, 2 Apr 2014 17:49:54 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Apr 2014 12:28:38 GMT",
"version": "v2"
},
{
"created": "Tue, 27 May 2014 15:08:24 GMT",
"version": "v3"
}
] | 2015-06-19 | [
[
"Krauss",
"Lawrence M.",
""
],
[
"Wilczek",
"Frank",
""
]
] | It is commonly anticipated that gravity is subject to the standard principles of quantum mechanics. Yet some (including Einstein) have questioned that presumption, whose empirical basis is weak. Indeed, recently Freeman Dyson has emphasized that no conventional experiment is capable of detecting individual gravitons. H... |
1009.3920 | Pieter Miedema | P.G.Miedema | Formation of Population III Stars in a flat FLRW Universe | 6 pages, 1 figure | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Contrarily to general believe, a first-order cosmological perturbation theory
based on Einstein's General Theory of Relativity explains the formation of
massive primeval stars in a flat Friedmann-Lemaitre-Robertson-Walker universe
after decoupling of matter and radiation, whether or not Cold Dark Matter is
present. T... | [
{
"created": "Mon, 20 Sep 2010 19:31:30 GMT",
"version": "v1"
}
] | 2010-09-21 | [
[
"Miedema",
"P. G.",
""
]
] | Contrarily to general believe, a first-order cosmological perturbation theory based on Einstein's General Theory of Relativity explains the formation of massive primeval stars in a flat Friedmann-Lemaitre-Robertson-Walker universe after decoupling of matter and radiation, whether or not Cold Dark Matter is present. The... |
1908.05277 | Francois Foucart | Francois Foucart, Matthew D. Duez, Alana Gudinas, Francois Hebert,
Lawrence E. Kidder, Harald P. Pfeiffer, Mark A. Scheel | Smooth equations of state for high-accuracy simulations of neutron star
binaries | Submitted to PRD, 13p, 7 figures, 3 tables | Phys. Rev. D 100, 104048 (2019) | 10.1103/PhysRevD.100.104048 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | High-accuracy numerical simulations of merging neutron stars play an
important role in testing and calibrating the waveform models used by
gravitational wave observatories. Obtaining high-accuracy waveforms at a
reasonable computational cost, however, remains a significant challenge. One
issue is that high-order conv... | [
{
"created": "Wed, 14 Aug 2019 18:00:02 GMT",
"version": "v1"
}
] | 2019-12-04 | [
[
"Foucart",
"Francois",
""
],
[
"Duez",
"Matthew D.",
""
],
[
"Gudinas",
"Alana",
""
],
[
"Hebert",
"Francois",
""
],
[
"Kidder",
"Lawrence E.",
""
],
[
"Pfeiffer",
"Harald P.",
""
],
[
"Scheel",
"Mark A.",
... | High-accuracy numerical simulations of merging neutron stars play an important role in testing and calibrating the waveform models used by gravitational wave observatories. Obtaining high-accuracy waveforms at a reasonable computational cost, however, remains a significant challenge. One issue is that high-order conver... |
1412.6640 | Behrouz Mirza | Behrouz Mirza, Fatemeh Oboudiat | A Dynamical System Analysis of $f(R,T)$ Gravity | 10 pages, 10 figures | International Journal of Geometric Methods in Modern Physics, Vol.
13, No. 9 (2016) 1650108 | 10.1142/S0219887816501085 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate equations of motion and future singularities of $f(R,T)$
gravity where $R$ is the Ricci scalar and $T$ is the trace of stress-energy
tensor. Future singularities for two kinds of equation of state (barotropic
perfect fluid and generalized form of equation of state) are studied. While no
future singular... | [
{
"created": "Sat, 20 Dec 2014 10:40:55 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Nov 2015 15:26:18 GMT",
"version": "v2"
},
{
"created": "Tue, 26 Jul 2016 10:01:52 GMT",
"version": "v3"
}
] | 2018-08-21 | [
[
"Mirza",
"Behrouz",
""
],
[
"Oboudiat",
"Fatemeh",
""
]
] | We investigate equations of motion and future singularities of $f(R,T)$ gravity where $R$ is the Ricci scalar and $T$ is the trace of stress-energy tensor. Future singularities for two kinds of equation of state (barotropic perfect fluid and generalized form of equation of state) are studied. While no future singularit... |
gr-qc/9910067 | Cai Rong-Gen | Rong-Gen Cai and Anzhong Wang | Late-time evolution of the Yang-Mills field in the spherically symmetric
gravitational collapse | Revtex, 14 pages, no figures | Gen.Rel.Grav.31:1367-1382,1999 | 10.1023/A:1026737127191 | null | gr-qc | null | We investigate the late-time evolution of the Yang-Mills field in the
self-gravitating backgrounds: Schwarzschild and Reissner-Nordstr\"om
spacetimes. The late-time power-law tails develop in the three asymptotic
regions: the future timelike infinity, the future null infinity and the black
hole horizon. In these two ... | [
{
"created": "Wed, 20 Oct 1999 14:03:15 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Cai",
"Rong-Gen",
""
],
[
"Wang",
"Anzhong",
""
]
] | We investigate the late-time evolution of the Yang-Mills field in the self-gravitating backgrounds: Schwarzschild and Reissner-Nordstr\"om spacetimes. The late-time power-law tails develop in the three asymptotic regions: the future timelike infinity, the future null infinity and the black hole horizon. In these two ba... |
1306.6401 | Ryotaro Kase | Ryotaro Kase and Shinji Tsujikawa | Screening the fifth force in the Horndeski's most general scalar-tensor
theories | 25 pages, 3 figures | JCAP 08 (2013) 054 | 10.1088/1475-7516/2013/08/054 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study how the Vainshtein mechanism operates in the most general
scalar-tensor theories with second-order equations of motion. The field
equations of motion, which can be also applicable to most of other screening
scenarios proposed in literature, are generally derived in a spherically
symmetric space-time with a m... | [
{
"created": "Thu, 27 Jun 2013 03:53:54 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Aug 2013 10:33:51 GMT",
"version": "v2"
}
] | 2013-09-02 | [
[
"Kase",
"Ryotaro",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We study how the Vainshtein mechanism operates in the most general scalar-tensor theories with second-order equations of motion. The field equations of motion, which can be also applicable to most of other screening scenarios proposed in literature, are generally derived in a spherically symmetric space-time with a mat... |
2003.00256 | Ernesto Contreras | Cynthia Arias, Francisco Tello-Ortiz and Ernesto Contreras | Extra packing of mass of anisotropic interiors induced by MGD | null | Eur. Phys. J. C 80, 463 (2020) | 10.1140/epjc/s10052-020-8042-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate the extra packing of mass within the framework of
gravitational decoupling by means of Minimal Geometric Deformation approach. It
is shown that, after a suitable set of the free parameters involved, the
like--Tolman IV solution extended by Minimal Geometric Deformation not only
acquire ext... | [
{
"created": "Sat, 29 Feb 2020 13:41:46 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Jun 2020 03:18:47 GMT",
"version": "v2"
}
] | 2020-06-09 | [
[
"Arias",
"Cynthia",
""
],
[
"Tello-Ortiz",
"Francisco",
""
],
[
"Contreras",
"Ernesto",
""
]
] | In this work we investigate the extra packing of mass within the framework of gravitational decoupling by means of Minimal Geometric Deformation approach. It is shown that, after a suitable set of the free parameters involved, the like--Tolman IV solution extended by Minimal Geometric Deformation not only acquire extra... |
gr-qc/0303107 | Dag {\O}stvang | Dag {\O}stvang | Classical Electrodynamics in Quasi-Metric Space-Time | 23 pages, v2: major revision; v3: errors corrected, exact solution
found; v4: accepted for publication in G&C; v5: minor corrections pp. 6,18;
v6: must have non-universal gravitational coupling; v7: fully coupled theory
implemented; v8: fully coupled theory abandoned; v11: inconsistent equation
replaced | Grav.Cosmol. 12 (2006) 262-272 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quasi-metric manifold $\cal N$ is equipped with two one-parameter
families of metric tensors ${\bf {\bar g}}_t$ and ${\bf g}_t$, each
parametrized by the global time function $t$. Moreover, in $({\cal N},{\bf
{\bar g}}_t)$ one must define two different electromagnetic field tensor
families corresponding to the ac... | [
{
"created": "Wed, 26 Mar 2003 22:17:36 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Feb 2023 15:00:57 GMT",
"version": "v10"
},
{
"created": "Thu, 21 Mar 2024 15:47:47 GMT",
"version": "v11"
},
{
"created": "Sun, 21 Dec 2003 20:35:35 GMT",
"version": "v2"
},
{
"... | 2024-03-22 | [
[
"Østvang",
"Dag",
""
]
] | The quasi-metric manifold $\cal N$ is equipped with two one-parameter families of metric tensors ${\bf {\bar g}}_t$ and ${\bf g}_t$, each parametrized by the global time function $t$. Moreover, in $({\cal N},{\bf {\bar g}}_t)$ one must define two different electromagnetic field tensor families corresponding to the acti... |
1301.4327 | Spyros Basilakos | Spyros Basilakos and Panayiotis Stavrinos | Cosmological equivalence between the Finsler-Randers space-time and the
DGP gravity model | 6 pages, 2 figures, accepted for publication in Phys. Rev. D. (typos
corrected, published version) | null | 10.1103/PhysRevD.87.043506 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a detailed comparison between the Finsler-Randers cosmological
model and the Dvali, Gabadadze and Porrati braneworld model. If we assume that
the spatial curvature is strictly equal to zero then we prove the following
interesting proposition: {\it despite the fact that the current cosmological
models have ... | [
{
"created": "Fri, 18 Jan 2013 09:31:18 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Jan 2013 07:53:55 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Basilakos",
"Spyros",
""
],
[
"Stavrinos",
"Panayiotis",
""
]
] | We perform a detailed comparison between the Finsler-Randers cosmological model and the Dvali, Gabadadze and Porrati braneworld model. If we assume that the spatial curvature is strictly equal to zero then we prove the following interesting proposition: {\it despite the fact that the current cosmological models have a ... |
gr-qc/9812026 | Mihaela Time | Mihaela Time | Static Cylindrically Symmetric Solution | 6 pages, http://users.warpnet.ro/~mtime/ | null | null | null | gr-qc | null | A static axisymmetric solution with an additional cylindrical symmetry is
considered and that the matter consists in a cosmological and a dust term.
| [
{
"created": "Mon, 7 Dec 1998 20:38:38 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Dec 1998 17:24:14 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Time",
"Mihaela",
""
]
] | A static axisymmetric solution with an additional cylindrical symmetry is considered and that the matter consists in a cosmological and a dust term. |
2006.12265 | Amin Dehyadegari | Amin Dehyadegari, Ahmad Sheykhi, Shao-Wen Wei | Microstructure of charged AdS black hole via $P-V$ criticality | 7 pages,4 figures | Phys. Rev. D 102, 104013 (2020) | 10.1103/PhysRevD.102.104013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest a new thermodynamic curvature, constructed via adiabatic
compressibility, for examining the internal microstructure of charged black
holes in an anti-de Sitter (AdS) background. We analyze the microscopic
properties of small-large phase transition of black holes with pressure and
volume as the fluctuation ... | [
{
"created": "Fri, 19 Jun 2020 06:03:05 GMT",
"version": "v1"
}
] | 2020-11-10 | [
[
"Dehyadegari",
"Amin",
""
],
[
"Sheykhi",
"Ahmad",
""
],
[
"Wei",
"Shao-Wen",
""
]
] | We suggest a new thermodynamic curvature, constructed via adiabatic compressibility, for examining the internal microstructure of charged black holes in an anti-de Sitter (AdS) background. We analyze the microscopic properties of small-large phase transition of black holes with pressure and volume as the fluctuation va... |
gr-qc/9912046 | WU Zhong Chao | Zhong Chao Wu (Beijing Normal University) | Can Black Hole be Created at the Birth of the Universe? | honorary mention from Gravitation Research Foundation in 1999 | Mod.Phys.Lett. A14 (1999) 2403-2408 | null | Beijing preprint 104-98 | gr-qc hep-th | null | We study the quantum creation of black hole pairs in the (anti-)de Sitter
space background. These black hole pairs in the Kerr-Newman family are created
from constrained instantons. At the $WKB$ level, for the chargeless and
nonrotating case, the relative creation probability is the exponential of (the
negative of) t... | [
{
"created": "Fri, 10 Dec 1999 22:14:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wu",
"Zhong Chao",
"",
"Beijing Normal University"
]
] | We study the quantum creation of black hole pairs in the (anti-)de Sitter space background. These black hole pairs in the Kerr-Newman family are created from constrained instantons. At the $WKB$ level, for the chargeless and nonrotating case, the relative creation probability is the exponential of (the negative of) the... |
gr-qc/0204088 | Hiromi Saida | Hiromi Saida | Hawking Radiation in the Swiss Cheese Universe | 21pages. Accepted for publication in Class. Quntum Grav | Class.Quant.Grav. 19 (2002) 3179-3206 | 10.1088/0264-9381/19/12/306 | null | gr-qc | null | The Hawking radiation forms the essential basis of the black hole
thermodynamics. The black hole thermodynamics denotes a nice correspondence
between black hole kinematics and the laws of ordinary thermodynamics, but has
been so far considered only in an asymptotically flat case. Does such the
correspondence rely str... | [
{
"created": "Tue, 30 Apr 2002 03:50:42 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Saida",
"Hiromi",
""
]
] | The Hawking radiation forms the essential basis of the black hole thermodynamics. The black hole thermodynamics denotes a nice correspondence between black hole kinematics and the laws of ordinary thermodynamics, but has been so far considered only in an asymptotically flat case. Does such the correspondence rely stron... |
1110.0697 | Emmanuil Saridakis | Emmanuel N. Saridakis | Constraining Horava-Lifshitz gravity from neutrino speed experiments | 5 pages, no figure, version published at Gen.Rel.Grav | General Relativity and Gravitation: Volume 45, Issue 2 (2013),
Page 387-394 | 10.1007/s10714-012-1477-6 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We constrain Horava-Lifshitz gravity using the results of OPERA and ICARUS
neutrino speed experiments, which show that neutrinos are luminal particles,
examining the fermion propagation in the earth's gravitational field. In
particular, investigating the Dirac equation in the spherical solutions of the
theory, we fin... | [
{
"created": "Mon, 3 Oct 2011 12:48:32 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Nov 2012 13:53:19 GMT",
"version": "v2"
}
] | 2013-01-29 | [
[
"Saridakis",
"Emmanuel N.",
""
]
] | We constrain Horava-Lifshitz gravity using the results of OPERA and ICARUS neutrino speed experiments, which show that neutrinos are luminal particles, examining the fermion propagation in the earth's gravitational field. In particular, investigating the Dirac equation in the spherical solutions of the theory, we find ... |
1504.01900 | Bob Osano | Bob Osano | The decoupling of scalar-modes from a linearly perturbed dust-filled
Bianchi type I model | 4 pages | Chin.Phys.Lett. 31 (2014) 010402 (2014-01-21) | 10.1088/0256-307X/31/1/010402 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study linear perturbations about a dust filled Bianchi Type I model with
the vorticity set to zero. In comparison to linear perturbations about FLRW
models, modes of perturbations about Bianchi type I models are coupled. We find
that the tensor that represents the background shear needs to be degenerate in
order f... | [
{
"created": "Wed, 8 Apr 2015 10:27:02 GMT",
"version": "v1"
}
] | 2015-04-09 | [
[
"Osano",
"Bob",
""
]
] | We study linear perturbations about a dust filled Bianchi Type I model with the vorticity set to zero. In comparison to linear perturbations about FLRW models, modes of perturbations about Bianchi type I models are coupled. We find that the tensor that represents the background shear needs to be degenerate in order for... |
1105.4536 | Victor Shchigolev Konstantinovich | V.K. Shchigolev, M.P. Rotova | Modelling Tachyon Cosmology with Non-Minimal Derivative Coupling to
Gravity | 7 pages | Grav.Cosmol, 2012, Vol. 18, No. 1, pp. 88-92 | 10.1134/S0202289312010161 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a tachyon model with non-minimal derivative coupling to gravity in
the Friedmann-Robertson-Walker flat cosmology. We propose the special
re-definition of the tachyon field which allows us to represent tachyon field
equation formally coinciding with its usual form but with re-defined Hubble
parameter. Two fir... | [
{
"created": "Mon, 23 May 2011 15:49:10 GMT",
"version": "v1"
},
{
"created": "Wed, 25 May 2011 16:17:42 GMT",
"version": "v2"
},
{
"created": "Sat, 6 Aug 2011 20:36:47 GMT",
"version": "v3"
}
] | 2012-09-13 | [
[
"Shchigolev",
"V. K.",
""
],
[
"Rotova",
"M. P.",
""
]
] | We study a tachyon model with non-minimal derivative coupling to gravity in the Friedmann-Robertson-Walker flat cosmology. We propose the special re-definition of the tachyon field which allows us to represent tachyon field equation formally coinciding with its usual form but with re-defined Hubble parameter. Two first... |
gr-qc/0405145 | Drago Alessandro | A. Drago, G. Pagliara (University and INFN Ferrara, Italy), Z.
Berezhiani (University of L'Aquila and INFN Lab. Naz. Gran Sasso, Italy) | Gravitational wave bursts induced by r-mode spin-down of hybrid stars | 9 pages, 8 figures, revised version, to be published in Astronomy &
Astrophysics | Astron.Astrophys.445:1053-1060,2006 | 10.1051/0004-6361:20053276 | null | gr-qc astro-ph hep-ph | null | We show that sudden variations in the composition and structure of an hybrid
star can be triggered by its rapid spin-down, induced by r-mode instabilities.
The discontinuity of this process is due to the surface tension between
hadronic and quark matter and in particular to the overpressure needed to
nucleate new str... | [
{
"created": "Sat, 29 May 2004 16:15:02 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Apr 2005 13:07:37 GMT",
"version": "v2"
},
{
"created": "Wed, 31 Aug 2005 09:53:57 GMT",
"version": "v3"
}
] | 2011-05-23 | [
[
"Drago",
"A.",
"",
"University and INFN Ferrara, Italy"
],
[
"Pagliara",
"G.",
"",
"University and INFN Ferrara, Italy"
],
[
"Berezhiani",
"Z.",
"",
"University of L'Aquila and INFN Lab. Naz. Gran Sasso, Italy"
]
] | We show that sudden variations in the composition and structure of an hybrid star can be triggered by its rapid spin-down, induced by r-mode instabilities. The discontinuity of this process is due to the surface tension between hadronic and quark matter and in particular to the overpressure needed to nucleate new struc... |
2208.05729 | Hernando Quevedo | Luis M. Sanchez and Hernando Quevedo | Thermodynamics of the FLRW apparent horizon | Typos corrected, comments and reference added | null | 10.1016/j.physletb.2023.137778 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To investigate the relationship between gravity and thermodynamics in the
case of dynamic systems, we interpret the apparent horizon of the
Friedmann-Lema\^itre-Robertson-Walker (FLRW) spacetime as a thermodynamic
system. We derive the corresponding fundamental equation in the entropy
representation and explore the c... | [
{
"created": "Thu, 11 Aug 2022 09:51:20 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Aug 2022 06:57:55 GMT",
"version": "v2"
}
] | 2023-03-22 | [
[
"Sanchez",
"Luis M.",
""
],
[
"Quevedo",
"Hernando",
""
]
] | To investigate the relationship between gravity and thermodynamics in the case of dynamic systems, we interpret the apparent horizon of the Friedmann-Lema\^itre-Robertson-Walker (FLRW) spacetime as a thermodynamic system. We derive the corresponding fundamental equation in the entropy representation and explore the con... |
2310.04744 | Bogus{\l}aw Broda | Bogus{\l}aw Broda | Unitary (semi)causal quantum-circuit representation of black hole
evaporation | further improvements, 16 pages, several figures | Eur. Phys. J. C 84, 413 (2024) | 10.1140/epjc/s10052-024-12748-z | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | A general structure of unitary evolution (evaporation) of the black hole,
respecting causality imposed by the event horizon (semicausality), has been
derived and presented in the language of quantum circuits. The resulting
consequences for the evolution of the corresponding entanglement entropy and
the entropy curve ... | [
{
"created": "Sat, 7 Oct 2023 09:01:53 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Oct 2023 06:21:58 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Oct 2023 16:07:43 GMT",
"version": "v3"
},
{
"created": "Fri, 23 Feb 2024 09:12:09 GMT",
"version": "v4"
}
] | 2024-04-25 | [
[
"Broda",
"Bogusław",
""
]
] | A general structure of unitary evolution (evaporation) of the black hole, respecting causality imposed by the event horizon (semicausality), has been derived and presented in the language of quantum circuits. The resulting consequences for the evolution of the corresponding entanglement entropy and the entropy curve ha... |
2012.06839 | Lisa Mickel | Mehdi Assanioussi and Lisa Mickel | Loop effective model for Schwarzschild black hole interior: a modified
$\bar \mu$ dynamics | 25 pages, 6 figures; v2: journal version, calculations in sec. III A
extended to a more general form of $\bar \mu$, minor comments and references
added | Phys. Rev. D 103, 124008 (2021) | 10.1103/PhysRevD.103.124008 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this article, we introduce a new effective model for the Kantowski-Sachs
spacetime in the context of loop quantum gravity, and we use it to evaluate
departures from general relativity in the case of Schwarzschild black hole
interior. The model is based on an effective Hamiltonian constructed via the
regularized Th... | [
{
"created": "Sat, 12 Dec 2020 15:19:01 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jun 2021 13:28:24 GMT",
"version": "v2"
}
] | 2021-06-21 | [
[
"Assanioussi",
"Mehdi",
""
],
[
"Mickel",
"Lisa",
""
]
] | In this article, we introduce a new effective model for the Kantowski-Sachs spacetime in the context of loop quantum gravity, and we use it to evaluate departures from general relativity in the case of Schwarzschild black hole interior. The model is based on an effective Hamiltonian constructed via the regularized Thie... |
1804.08075 | Cristian Stelea | Cristian Stelea, Marina-Aura Dariescu and Ciprian Dariescu | On magnetized anisotropic stars | 12 pages, no figures, added references | Phys. Rev. D 97, 104059 (2018) | 10.1103/PhysRevD.97.104059 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend a known solution generating technique for isotropic fluids in order
to construct more general models of anisotropic stars with poloidal magnetic
fields. In particular, we discuss the magnetized versions of some well-known
exact solutions describing anisotropic stars and dark energy stars and we
describe som... | [
{
"created": "Sun, 22 Apr 2018 06:57:14 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Apr 2018 16:48:11 GMT",
"version": "v2"
}
] | 2018-06-06 | [
[
"Stelea",
"Cristian",
""
],
[
"Dariescu",
"Marina-Aura",
""
],
[
"Dariescu",
"Ciprian",
""
]
] | We extend a known solution generating technique for isotropic fluids in order to construct more general models of anisotropic stars with poloidal magnetic fields. In particular, we discuss the magnetized versions of some well-known exact solutions describing anisotropic stars and dark energy stars and we describe some ... |
gr-qc/0105096 | Robert T. Jantzen | Robert T. Jantzen, Paolo Carini and Donato Bini | Gravitoelectromagnetism: Just a Big Word? | 20 pages latex2.09, invited talk given by R. Jantzen at the Seventh
Marcel Grossmann Meeting on General Relativity and Gravitation (Stanford
1994) | Proceedings of the Seventh Marcel Grossmann Meeting (Stanford
1994), Eds. R.T Jantzen and G.M. Keiser, World Scientific, Singapore, 1996,
pp. 133-152 | null | null | gr-qc | null | Arguments are made in favor of broadening the scope of the various approaches
to splitting spacetime into a single common framework in which measured
quantities, derivative operations, and adapted coordinate systems are clearly
understood in terms of associated test observer families. This ``relativity of
splitting f... | [
{
"created": "Sat, 26 May 2001 00:11:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Jantzen",
"Robert T.",
""
],
[
"Carini",
"Paolo",
""
],
[
"Bini",
"Donato",
""
]
] | Arguments are made in favor of broadening the scope of the various approaches to splitting spacetime into a single common framework in which measured quantities, derivative operations, and adapted coordinate systems are clearly understood in terms of associated test observer families. This ``relativity of splitting for... |
gr-qc/9805027 | Carlos Kozameh | Mirta Iriondo, Carlos Kozameh, and Alejandra Rojas | Null Surfaces and Legendre Submanifolds | 28 pages, 7 figures | J.Math.Phys. 40 (1999) 2483-2493 | 10.1063/1.533077 | null | gr-qc | null | It is shown that the main variable Z of the Null Surface Formulation of GR is
the generating function of a constrained Lagrange submanifold that lives on the
energy surface H=0 and that its level surfaces Z=const. are Legendre
submanifolds on that energy surface.
The behaviour of the variable Z at the caustic point... | [
{
"created": "Fri, 8 May 1998 14:53:33 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Iriondo",
"Mirta",
""
],
[
"Kozameh",
"Carlos",
""
],
[
"Rojas",
"Alejandra",
""
]
] | It is shown that the main variable Z of the Null Surface Formulation of GR is the generating function of a constrained Lagrange submanifold that lives on the energy surface H=0 and that its level surfaces Z=const. are Legendre submanifolds on that energy surface. The behaviour of the variable Z at the caustic points is... |
2301.06149 | Eleonora Giovannetti | Eleonora Giovannetti, Fabio Maione, Giovanni Montani | Quantum Big Bounce of the isotropic Universe via a relational time | null | Universe 2023, 9(8), 373 | 10.3390/universe9080373 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the canonical quantum dynamics of the isotropic Universe in a
metric approach by adopting a self-interacting scalar field as relational time.
When the potential term is absent we are able to associate the the expanding
and collapsing dynamics of the Universe with the positive and negative
frequency modes t... | [
{
"created": "Sun, 15 Jan 2023 17:41:57 GMT",
"version": "v1"
},
{
"created": "Mon, 8 May 2023 15:13:40 GMT",
"version": "v2"
}
] | 2023-09-15 | [
[
"Giovannetti",
"Eleonora",
""
],
[
"Maione",
"Fabio",
""
],
[
"Montani",
"Giovanni",
""
]
] | We analyze the canonical quantum dynamics of the isotropic Universe in a metric approach by adopting a self-interacting scalar field as relational time. When the potential term is absent we are able to associate the the expanding and collapsing dynamics of the Universe with the positive and negative frequency modes tha... |
0711.0816 | Ion I. Cot{\ba}escu | Ion I. Cot\u{a}escu | New Dirac quantum modes in moving frames of the de Sitter spacetime | 15 pages, no figures | Int.J.Mod.Phys.A23:3707-3720,2008 | 10.1142/S0217751X08041566 | null | gr-qc | null | Recently a new time-evolution picture of the Dirac quantum mechanics was
defined in charts with spatially flat Robertson-Walker metrics, under the name
of Schr\"{o}dinger picture [I. I. Cot\u{a}escu, arXiv:0708.0734] . In the
present paper new Dirac quantum modes are found in moving charts of the de
Sitter spacetime ... | [
{
"created": "Tue, 6 Nov 2007 09:19:01 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Cotăescu",
"Ion I.",
""
]
] | Recently a new time-evolution picture of the Dirac quantum mechanics was defined in charts with spatially flat Robertson-Walker metrics, under the name of Schr\"{o}dinger picture [I. I. Cot\u{a}escu, arXiv:0708.0734] . In the present paper new Dirac quantum modes are found in moving charts of the de Sitter spacetime us... |
1103.1072 | Jason Hanson | Jason Hanson | Orthogonal decomposition of Lorentz transformations | null | null | 10.1007/s10714-012-1489-2 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The canonical decomposition of a Lorentz algebra element into a sum of
orthogonal simple (decomposable) Lorentz bivectors is discussed, as well as the
decomposition of a proper orthochronous Lorentz transformation into a product
of commuting Lorentz transformations, each of which is the exponential of a
simple bivect... | [
{
"created": "Sat, 5 Mar 2011 18:13:51 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Nov 2012 16:21:20 GMT",
"version": "v2"
}
] | 2012-11-27 | [
[
"Hanson",
"Jason",
""
]
] | The canonical decomposition of a Lorentz algebra element into a sum of orthogonal simple (decomposable) Lorentz bivectors is discussed, as well as the decomposition of a proper orthochronous Lorentz transformation into a product of commuting Lorentz transformations, each of which is the exponential of a simple bivector... |
2402.02557 | Wei-Can Syu | Wei-Can Syu, and Da-Shin Lee | Acoustic quasibound states and tachyonic instabilities from binary
Bose-Einstein condensates | Revised title and updated content including modified continued
fraction method (12 pages, 6 figures) | null | null | null | gr-qc cond-mat.quant-gas | http://creativecommons.org/licenses/by/4.0/ | We consider two-component Bose-Einstein condensates (BECs) and introduce the
BEC vortex in $1+2$ dimensions. We focus on two types of gapped excitations
induced by the modes of two-component BECs with relative phases of $0$ and
$\pi$, analogous to the massive scalar field with positive and negative mass
squared, resp... | [
{
"created": "Sun, 4 Feb 2024 16:11:45 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 2024 16:48:10 GMT",
"version": "v2"
}
] | 2024-08-02 | [
[
"Syu",
"Wei-Can",
""
],
[
"Lee",
"Da-Shin",
""
]
] | We consider two-component Bose-Einstein condensates (BECs) and introduce the BEC vortex in $1+2$ dimensions. We focus on two types of gapped excitations induced by the modes of two-component BECs with relative phases of $0$ and $\pi$, analogous to the massive scalar field with positive and negative mass squared, respec... |
1912.10460 | Dong-han Yeom | Dong-han Yeom | Quantum gravitational wave function for the interior of a black hole and
the generalized uncertainty principle | 6 pages, 2 figures, 1 table, Proceedings of the 14th Asia-Pacific
Physics Conference. Talk on November 21, 2019, Kuching, Malaysia | AIP Conf.Proc. 2319 (2021) 040001 | 10.1063/5.0038344 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigate the internal structures of a Schwarzschild black hole by
solving the Wheeler-DeWitt equation. The generic bounded wave function has a
bouncing point around $r \simeq M$, where $M$ is the black hole mass. Due to
this quantum bouncing, there appears an ambiguity to define the arrow of time.
If we introdu... | [
{
"created": "Sun, 22 Dec 2019 15:16:57 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 2021 02:03:20 GMT",
"version": "v2"
}
] | 2021-02-09 | [
[
"Yeom",
"Dong-han",
""
]
] | We investigate the internal structures of a Schwarzschild black hole by solving the Wheeler-DeWitt equation. The generic bounded wave function has a bouncing point around $r \simeq M$, where $M$ is the black hole mass. Due to this quantum bouncing, there appears an ambiguity to define the arrow of time. If we introduce... |
2303.16323 | Michele Mancarella | Michele Mancarella, Francesco Iacovelli, Davide Gerosa | Inferring, not just detecting: metrics for high-redshift sources
observed with third-generation gravitational-wave detectors | 6 pages, 4 figures. v2: matches version published on PRD Lett | null | 10.1103/PhysRevD.107.L101302 | null | gr-qc astro-ph.CO astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The detection of black-hole binaries at high redshifts is a cornerstone of
the science case of third-generation gravitational-wave interferometers. The
star-formation rate peaks at z~2 and decreases by orders of magnitude by z~10.
Any confident detection of gravitational waves from such high redshifts would
imply eit... | [
{
"created": "Tue, 28 Mar 2023 21:48:33 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jun 2023 10:04:25 GMT",
"version": "v2"
}
] | 2023-06-19 | [
[
"Mancarella",
"Michele",
""
],
[
"Iacovelli",
"Francesco",
""
],
[
"Gerosa",
"Davide",
""
]
] | The detection of black-hole binaries at high redshifts is a cornerstone of the science case of third-generation gravitational-wave interferometers. The star-formation rate peaks at z~2 and decreases by orders of magnitude by z~10. Any confident detection of gravitational waves from such high redshifts would imply eithe... |
gr-qc/0303099 | Matthew Anderson | Scott A. Caveny, Matthew Anderson, Richard A. Matzner | Tracking Black Holes in Numerical Relativity | 14 pages, 16 figures | Phys.Rev. D68 (2003) 104009 | 10.1103/PhysRevD.68.104009 | null | gr-qc | null | This work addresses and solves the problem of generically tracking black hole
event horizons in computational simulation of black hole interactions.
Solutions of the hyperbolic eikonal equation, solved on a curved spacetime
manifold containing black hole sources, are employed in development of a robust
tracking metho... | [
{
"created": "Tue, 25 Mar 2003 22:28:16 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Caveny",
"Scott A.",
""
],
[
"Anderson",
"Matthew",
""
],
[
"Matzner",
"Richard A.",
""
]
] | This work addresses and solves the problem of generically tracking black hole event horizons in computational simulation of black hole interactions. Solutions of the hyperbolic eikonal equation, solved on a curved spacetime manifold containing black hole sources, are employed in development of a robust tracking method ... |
2006.16751 | Jia-Xi Feng | Jia-Xi Feng, Bao-Min Gu, and Fu-Wen Shu | Theoretical and observational constraints on regularized 4$D$
Einstein-Gauss-Bonnet gravity | 11 pages, 3 figures; improvements to presentation, some of the
content reordered, and new content added to roughly comment about the scalar
perturbations, version to be published in PRD | Phys. Rev. D 103, 064002 (2021) | 10.1103/PhysRevD.103.064002 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Regularized Einstein-Gauss-Bonnet (EGB) theory of gravity in four dimensions
is a new attempt to include nontrivial contributions of Gauss-Bonnet term. In
this paper, we make a detailed analysis on possible constraints of the model
parameters of the theory from recent cosmological observations, and some
theoretical c... | [
{
"created": "Tue, 30 Jun 2020 13:11:28 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Feb 2021 16:02:53 GMT",
"version": "v2"
}
] | 2021-03-10 | [
[
"Feng",
"Jia-Xi",
""
],
[
"Gu",
"Bao-Min",
""
],
[
"Shu",
"Fu-Wen",
""
]
] | Regularized Einstein-Gauss-Bonnet (EGB) theory of gravity in four dimensions is a new attempt to include nontrivial contributions of Gauss-Bonnet term. In this paper, we make a detailed analysis on possible constraints of the model parameters of the theory from recent cosmological observations, and some theoretical con... |
gr-qc/0312011 | Abel Camacho Mr. | Abel Camacho (Universidad Autonoma Metropolitana-Iztapalapa) and Abel
Camacho-Galvan (DEPFI-UNAM) | Sagnac interferometry and non-Newtonian gravity | Accepted in General relativity and Gravitation | Gen.Rel.Grav. 36 (2004) 1207-1211 | 10.1023/B:GERG.0000018287.13676.5d | null | gr-qc quant-ph | null | Sagnac interferometry has been employed in the context of gravity as a
proposal for the detection of the so called gravitomagnetic effect. In the
present work we explore the possibilities that this experimental device could
open up in the realm of non--Newtonian gravity. It will be shown that this
experimental approa... | [
{
"created": "Mon, 1 Dec 2003 23:19:40 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Camacho",
"Abel",
"",
"Universidad Autonoma Metropolitana-Iztapalapa"
],
[
"Camacho-Galvan",
"Abel",
"",
"DEPFI-UNAM"
]
] | Sagnac interferometry has been employed in the context of gravity as a proposal for the detection of the so called gravitomagnetic effect. In the present work we explore the possibilities that this experimental device could open up in the realm of non--Newtonian gravity. It will be shown that this experimental approach... |
2112.08243 | Carlos A. Mar\'in V. | Pablo Ruales and Carlos Mar\'in | Light Deviation around a Spherical Rotating Black Hole to Fifth Order.
Lindstedt-Poincar\'e and Pad\'e Approximations | 29 pages, 17 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Light deviation around a rotating black hole is calculated using the Kerr
metric for both small and large deviation angles. For small angles the
Lindstedt-Poincar\'e method is employed to get well-behaved solutions, as well
as Pad\'e approximants. For large deviation angles numerical integration has
been used.
| [
{
"created": "Wed, 15 Dec 2021 16:22:50 GMT",
"version": "v1"
}
] | 2021-12-16 | [
[
"Ruales",
"Pablo",
""
],
[
"Marín",
"Carlos",
""
]
] | Light deviation around a rotating black hole is calculated using the Kerr metric for both small and large deviation angles. For small angles the Lindstedt-Poincar\'e method is employed to get well-behaved solutions, as well as Pad\'e approximants. For large deviation angles numerical integration has been used. |
1006.2933 | Philippe G. LeFloch | Philippe G. LeFloch and Jacques Smulevici | Global geometry of T2 symmetric spacetimes with weak regularity | 5 pages | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define the class of weakly regular spacetimes with T2 symmetry, and
investigate their global geometry structure. We formulate the initial value
problem for the Einstein vacuum equations with weak regularity, and establish
the existence of a global foliation by the level sets of the area R of the
orbits of symmetry... | [
{
"created": "Tue, 15 Jun 2010 09:17:40 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Sep 2010 18:50:38 GMT",
"version": "v2"
}
] | 2010-09-10 | [
[
"LeFloch",
"Philippe G.",
""
],
[
"Smulevici",
"Jacques",
""
]
] | We define the class of weakly regular spacetimes with T2 symmetry, and investigate their global geometry structure. We formulate the initial value problem for the Einstein vacuum equations with weak regularity, and establish the existence of a global foliation by the level sets of the area R of the orbits of symmetry, ... |
1706.01785 | Ion I. Cotaescu | Ion I. Cotaescu | Anti-de Sitter relativity | 12 pages, 4 figures, accepted for publication in PRD | null | 10.1103/PhysRevD.96.044046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The relative geodesic motion on $(1+3)$-dimensional anti-de Sitter spacetimes
is studied in terms of conserved quantities by adapting the Nachtmann boosting
method created initially for the de Sitter spacetimes. In this approach the
Lorentzian isometriy is derived, relating the coordinates of the local chart of
a fix... | [
{
"created": "Tue, 6 Jun 2017 14:26:37 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jun 2017 16:56:40 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Jun 2017 10:33:53 GMT",
"version": "v3"
},
{
"created": "Sun, 6 Aug 2017 14:41:32 GMT",
"version": "v4"
}
] | 2017-09-13 | [
[
"Cotaescu",
"Ion I.",
""
]
] | The relative geodesic motion on $(1+3)$-dimensional anti-de Sitter spacetimes is studied in terms of conserved quantities by adapting the Nachtmann boosting method created initially for the de Sitter spacetimes. In this approach the Lorentzian isometriy is derived, relating the coordinates of the local chart of a fixed... |
2012.15561 | Ruth Gregory | Ruth Gregory, Zheng Liang Lim and Andrew Scoins | Thermodynamics of Many Black Holes | 28 pages, 8 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We discuss the thermodynamics of an array of collinear black holes which may
be accelerating. We prove a general First Law, including variations in the
tensions of strings linking and accelerating the black holes. We analyse the
implications of the First Law in a number of instructive cases, including that
of the C-m... | [
{
"created": "Thu, 31 Dec 2020 11:37:06 GMT",
"version": "v1"
}
] | 2021-01-01 | [
[
"Gregory",
"Ruth",
""
],
[
"Lim",
"Zheng Liang",
""
],
[
"Scoins",
"Andrew",
""
]
] | We discuss the thermodynamics of an array of collinear black holes which may be accelerating. We prove a general First Law, including variations in the tensions of strings linking and accelerating the black holes. We analyse the implications of the First Law in a number of instructive cases, including that of the C-met... |
2001.01351 | Yun Soo Myung | De-Cheng Zou, Yun Soo Myung | Black hole with primary scalar hair in Einstein-Weyl-Maxwell-conformal
scalar theory | 1+14 pages, 3 figures, version to appear in PRD | Phys. Rev. D 101, 084021 (2020) | 10.1103/PhysRevD.101.084021 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain a newly charged BBMB (Bocharova-Bronnikov-Melnikov-Bekenstein)
black hole solution from the Einstein-Weyl-Maxwell-conformal (conformally
coupled) scalar theory with a positive Weyl coupling parameter $m^2_2$
numerically. This solution has a primary scalar hair, compared to a secondary
scalar hair in the cha... | [
{
"created": "Mon, 6 Jan 2020 01:11:03 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Mar 2020 05:10:46 GMT",
"version": "v2"
}
] | 2020-04-15 | [
[
"Zou",
"De-Cheng",
""
],
[
"Myung",
"Yun Soo",
""
]
] | We obtain a newly charged BBMB (Bocharova-Bronnikov-Melnikov-Bekenstein) black hole solution from the Einstein-Weyl-Maxwell-conformal (conformally coupled) scalar theory with a positive Weyl coupling parameter $m^2_2$ numerically. This solution has a primary scalar hair, compared to a secondary scalar hair in the charg... |
0906.1725 | Luciano Vanzo | Roberto Di Criscienzo, Sean A.Hayward, Mario Nadalini, Luciano Vanzo,
Sergio Zerbini | Hamilton-Jacobi Tunneling Method for Dynamical Horizons in Different
Coordinate Gauges | Standard Latex document, typos corrected, refined discussion of
tunneling picture, subsection 5.1 removed | null | 10.1088/0264-9381/27/1/015006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Previous work on dynamical black hole instability is further elucidated
within the Hamilton-Jacobi method for horizon tunneling and the reconstruction
of the classical action by means of the null-expansion method. Everything is
based on two natural requirements, namely that the tunneling rate is an
observable and the... | [
{
"created": "Tue, 9 Jun 2009 13:43:52 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Dec 2009 09:17:19 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Di Criscienzo",
"Roberto",
""
],
[
"Hayward",
"Sean A.",
""
],
[
"Nadalini",
"Mario",
""
],
[
"Vanzo",
"Luciano",
""
],
[
"Zerbini",
"Sergio",
""
]
] | Previous work on dynamical black hole instability is further elucidated within the Hamilton-Jacobi method for horizon tunneling and the reconstruction of the classical action by means of the null-expansion method. Everything is based on two natural requirements, namely that the tunneling rate is an observable and there... |
0705.4449 | Marek Szydlowski | Jakub Mielczarek, Marek Szydlowski | Relic gravitons as the observable for Loop Quantum Cosmology | RevTeX4, 10 pages, 4 figures; v2: extended, more clarification on
quantum corrections | Phys.Lett.B657:20-26,2007 | 10.1016/j.physletb.2007.10.011 | null | gr-qc | null | In this paper we investigate tensor modes of perturbations in the universe
governed by Loop Quantum Cosmology. We derive the equation for tensor modes and
investigate numerically effects of quantum corrections. This investigation
reveals that the region of super-adiabatic amplification of tensor modes is
smaller in c... | [
{
"created": "Wed, 30 May 2007 18:34:58 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Sep 2007 07:55:55 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Mielczarek",
"Jakub",
""
],
[
"Szydlowski",
"Marek",
""
]
] | In this paper we investigate tensor modes of perturbations in the universe governed by Loop Quantum Cosmology. We derive the equation for tensor modes and investigate numerically effects of quantum corrections. This investigation reveals that the region of super-adiabatic amplification of tensor modes is smaller in com... |
2211.09526 | Alexey Toporensky | L. Le\'on Andonayre, M. Skugoreva, A. Toporensky, T. Vargas | A note on the arrow of time in nonminimally coupled scalar field FRW
cosmology | 11 pages with 5 pdf figures; matches published version | Gravit.Cosmol. 29 (2023) 4, 404-410 | 10.1134/S0202289323040023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the cyclic Universe scenario in scalar field FRW cosmology and
check its applicability for a nonminimally coupled scalar field. We show that
for the most popular case of a quartic potential and the standard nonminimal
coupling this scenario does work. On the other hand, we identify certain cases
where cycl... | [
{
"created": "Thu, 17 Nov 2022 13:42:36 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Dec 2022 10:03:00 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Dec 2023 21:07:42 GMT",
"version": "v3"
}
] | 2023-12-20 | [
[
"Andonayre",
"L. León",
""
],
[
"Skugoreva",
"M.",
""
],
[
"Toporensky",
"A.",
""
],
[
"Vargas",
"T.",
""
]
] | We revisit the cyclic Universe scenario in scalar field FRW cosmology and check its applicability for a nonminimally coupled scalar field. We show that for the most popular case of a quartic potential and the standard nonminimal coupling this scenario does work. On the other hand, we identify certain cases where cyclic... |
1301.7291 | Chris Van Den Broeck | Chris Van Den Broeck | Probing dynamical spacetimes with gravitational waves | 38 pages, 9 figures. Book chapter for the Springer Handbook of
Spacetime (Springer Verlag, to appear in 2013) | null | 10.1007/978-3-642-41992-8_27 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This decade will see the first direct detections of gravitational waves by
observatories such as Advanced LIGO and Virgo. Among the prime sources are
coalescences of binary neutron stars and black holes, which are ideal probes of
dynamical spacetime. This will herald a new era in the empirical study of
gravitation. F... | [
{
"created": "Wed, 30 Jan 2013 17:10:33 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Broeck",
"Chris Van Den",
""
]
] | This decade will see the first direct detections of gravitational waves by observatories such as Advanced LIGO and Virgo. Among the prime sources are coalescences of binary neutron stars and black holes, which are ideal probes of dynamical spacetime. This will herald a new era in the empirical study of gravitation. For... |
gr-qc/0009047 | Luis Lehner | Steve Brandt, Randall Correll, Roberto Gomez, Mijan Huq, Pablo Laguna,
Luis Lehner, Pedro Marronetti, Richard A. Matzner, David Neilsen, Jorge
Pullin, Erik Schnetter, Deirdre Shoemaker, Jeffrey Winicour | Grazing Collisions of Black Holes via the Excision of Singularities | 2 References corrected, reference to figure updated | Phys.Rev.Lett.85:5496-5499,2000 | 10.1103/PhysRevLett.85.5496 | null | gr-qc astro-ph | null | We present the first simulations of non-headon (grazing) collisions of binary
black holes in which the black hole singularities have been excised from the
computational domain. Initially two equal mass black holes $m$ are separated a
distance $\approx10m$ and with impact parameter $\approx2m$. Initial data are
based ... | [
{
"created": "Wed, 13 Sep 2000 21:52:55 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Sep 2000 20:07:43 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Brandt",
"Steve",
""
],
[
"Correll",
"Randall",
""
],
[
"Gomez",
"Roberto",
""
],
[
"Huq",
"Mijan",
""
],
[
"Laguna",
"Pablo",
""
],
[
"Lehner",
"Luis",
""
],
[
"Marronetti",
"Pedro",
""
],
[
"Matz... | We present the first simulations of non-headon (grazing) collisions of binary black holes in which the black hole singularities have been excised from the computational domain. Initially two equal mass black holes $m$ are separated a distance $\approx10m$ and with impact parameter $\approx2m$. Initial data are based on... |
0811.2066 | Jose Geraldo Pereira | Tiago Gribl Lucas and J. G. Pereira | Hodge Dual for Soldered Bundles | 8 pages, no figures. Accepted for publication in Journal of Physics A | J.Phys.A42:035402,2009 | 10.1088/1751-8113/42/3/035402 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to account for all possible contractions allowed by the presence of
the solder form, a generalized Hodge dual is defined for the case of soldered
bundles. Although for curvature the generalized dual coincides with the usual
one, for torsion it gives a completely new dual definition. Starting from the
standar... | [
{
"created": "Thu, 13 Nov 2008 10:28:30 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Lucas",
"Tiago Gribl",
""
],
[
"Pereira",
"J. G.",
""
]
] | In order to account for all possible contractions allowed by the presence of the solder form, a generalized Hodge dual is defined for the case of soldered bundles. Although for curvature the generalized dual coincides with the usual one, for torsion it gives a completely new dual definition. Starting from the standard ... |
1412.4227 | Eduardo Bittencourt | E. Bittencourt, U. Moschella, M. Novello and J.D. Toniato | Cosmology in GSG | 12 pages, 5 figures, accepted for publication in Phys. Rev. D | null | 10.1103/PhysRevD.90.123540 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe what cosmology looks like in the context of the geometric theory
of gravity (GSG) based on a single scalar field. There are two distinct classes
of cosmological solutions. An interesting feature is the possibility of having
a bounce without invoking exotic equations of state for the cosmic fluid. We
also ... | [
{
"created": "Sat, 13 Dec 2014 11:53:50 GMT",
"version": "v1"
}
] | 2015-02-17 | [
[
"Bittencourt",
"E.",
""
],
[
"Moschella",
"U.",
""
],
[
"Novello",
"M.",
""
],
[
"Toniato",
"J. D.",
""
]
] | We describe what cosmology looks like in the context of the geometric theory of gravity (GSG) based on a single scalar field. There are two distinct classes of cosmological solutions. An interesting feature is the possibility of having a bounce without invoking exotic equations of state for the cosmic fluid. We also di... |
2112.05603 | Iain Davies | Iain Davies and Harvey S. Reall | Well-posed formulation of Einstein-Maxwell effective field theory | null | null | 10.1103/PhysRevD.106.104019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the well-posedness of the initial value problem for
Einstein-Maxwell theory modified by higher derivative effective field theory
corrections. Field redefinitions can be used to bring the leading
parity-symmetric 4-derivative corrections to a form which gives second order
equations of motion. We show that ... | [
{
"created": "Fri, 10 Dec 2021 15:34:40 GMT",
"version": "v1"
}
] | 2022-11-23 | [
[
"Davies",
"Iain",
""
],
[
"Reall",
"Harvey S.",
""
]
] | We consider the well-posedness of the initial value problem for Einstein-Maxwell theory modified by higher derivative effective field theory corrections. Field redefinitions can be used to bring the leading parity-symmetric 4-derivative corrections to a form which gives second order equations of motion. We show that a ... |
gr-qc/0301111 | Deirdre Shoemaker | D. Shoemaker (1), K. Smith, U. Sperhake, P. Laguna (2), E. Schnetter
(3), and D. Fiske (4) ((1) Cornell, (2) Penn State, (3) Tuebingen, (4)
Maryland) | Moving black holes via singularity excision | 9 pages and 11 figures | Class.Quant.Grav. 20 (2003) 3729-3744 | 10.1088/0264-9381/20/16/313 | null | gr-qc | null | We present a singularity excision algorithm appropriate for numerical
simulations of black holes moving throughout the computational domain. The
method is an extension of the excision procedure previously used to obtain
stable simulations of single, non-moving black holes. The excision procedure
also shares elements ... | [
{
"created": "Mon, 27 Jan 2003 19:59:53 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Shoemaker",
"D.",
""
],
[
"Smith",
"K.",
""
],
[
"Sperhake",
"U.",
""
],
[
"Laguna",
"P.",
""
],
[
"Schnetter",
"E.",
""
],
[
"Fiske",
"D.",
""
]
] | We present a singularity excision algorithm appropriate for numerical simulations of black holes moving throughout the computational domain. The method is an extension of the excision procedure previously used to obtain stable simulations of single, non-moving black holes. The excision procedure also shares elements us... |
gr-qc/9411005 | Lee Smolin | Carlo Rovelli and Lee Smolin | Discreteness of area and volume in quantum gravity | 36 pages, latex, 13 figures uuencoded | Nucl.Phys. B442 (1995) 593-622; Erratum-ibid. B456 (1995) 753 | 10.1016/0550-3213(95)00150-Q | CGPG-94/11-1 | gr-qc | null | We study the operator that corresponds to the measurement of volume, in
non-perturbative quantum gravity, and we compute its spectrum. The operator is
constructed in the loop representation, via a regularization procedure; it is
finite, background independent, and diffeomorphism-invariant, and therefore
well defined ... | [
{
"created": "Wed, 2 Nov 1994 04:51:54 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Rovelli",
"Carlo",
""
],
[
"Smolin",
"Lee",
""
]
] | We study the operator that corresponds to the measurement of volume, in non-perturbative quantum gravity, and we compute its spectrum. The operator is constructed in the loop representation, via a regularization procedure; it is finite, background independent, and diffeomorphism-invariant, and therefore well defined on... |
1211.1888 | Artyom Astashenok V | Artyom V. Astashenok and Sergei D. Odintsov | Confronting dark energy models mimicking $\Lambda$CDM epoch with
observational constraints: future cosmological perturbations decay or future
Rip? | Misprints corrected, discussion enlarged. Accepted in Phys. Lett. B | Phys. Lett. B 718, 1194 (2013) | 10.1016/j.physletb.2012.12.058 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We confront dark energy models which are currently similar to $\Lambda$CDM
theory with observational data which include the SNe data, matter density
perturbations and baryon acoustic oscillations data. DE cosmology under
consideration may evolve to Big Rip, type II or type III future singularity, or
to Little Rip or ... | [
{
"created": "Thu, 8 Nov 2012 15:53:51 GMT",
"version": "v1"
},
{
"created": "Sun, 23 Dec 2012 09:10:40 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Astashenok",
"Artyom V.",
""
],
[
"Odintsov",
"Sergei D.",
""
]
] | We confront dark energy models which are currently similar to $\Lambda$CDM theory with observational data which include the SNe data, matter density perturbations and baryon acoustic oscillations data. DE cosmology under consideration may evolve to Big Rip, type II or type III future singularity, or to Little Rip or Ps... |
1006.5377 | Jian-Yang Zhu | Kui Xiao and Jian-Yang Zhu | Dynamical behavior of interacting dark energy in loop quantum cosmology | 7 pages, 5 figures | Int.J.Mod.Phys.A25:4993-5007,2010 | 10.1142/S0217751X10050585 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamical behaviors of interacting dark energy in loop quantum cosmology
are discussed in this paper. Based on defining three dimensionless variables,
we simplify the equations of the fixed points. The fixed points for interacting
dark energy can be determined by the Friedmann equation coupled with the
dynamical ... | [
{
"created": "Mon, 28 Jun 2010 15:31:05 GMT",
"version": "v1"
}
] | 2011-02-15 | [
[
"Xiao",
"Kui",
""
],
[
"Zhu",
"Jian-Yang",
""
]
] | The dynamical behaviors of interacting dark energy in loop quantum cosmology are discussed in this paper. Based on defining three dimensionless variables, we simplify the equations of the fixed points. The fixed points for interacting dark energy can be determined by the Friedmann equation coupled with the dynamical eq... |
gr-qc/9901043 | Dmitry A. Kalinin | Dmitry A. Kalinin | H-projectively Equivalent Kahler Manifolds and Gravitational Instantons | LaTeX 2.09, 46 Kb | Nihonkai Math. J. 1998, V.9, N2 | null | KSU-GRG-9814 | gr-qc | null | The goal of the present paper is to investigate four dimensional Kahler
manifolds admitting H-projective mappings with special attention to
Einstein-Kahler manifolds of this type which can be interpreted as field
configurations of the gravitational instantons.
| [
{
"created": "Fri, 15 Jan 1999 11:40:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kalinin",
"Dmitry A.",
""
]
] | The goal of the present paper is to investigate four dimensional Kahler manifolds admitting H-projective mappings with special attention to Einstein-Kahler manifolds of this type which can be interpreted as field configurations of the gravitational instantons. |
2303.16190 | Christian Peterson | Christian Peterson, Shalabh Gautam, In\^es Rainho, Alex
Va\~n\'o-Vi\~nuales and David Hilditch | 3D Evolution of a Good-Bad-Ugly-F Model on Compactified Hyperboloidal
Slices | 10 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Good-Bad-Ugly-F model is a system of semi-linear wave equations that
mimics the asymptotic form of the Einstein field equations in generalized
harmonic gauge with specific constraint damping and suitable gauge source
functions. These constraint additions and gauge source functions eliminate
logarithmic divergence... | [
{
"created": "Tue, 28 Mar 2023 17:54:02 GMT",
"version": "v1"
}
] | 2023-03-29 | [
[
"Peterson",
"Christian",
""
],
[
"Gautam",
"Shalabh",
""
],
[
"Rainho",
"Inês",
""
],
[
"Vañó-Viñuales",
"Alex",
""
],
[
"Hilditch",
"David",
""
]
] | The Good-Bad-Ugly-F model is a system of semi-linear wave equations that mimics the asymptotic form of the Einstein field equations in generalized harmonic gauge with specific constraint damping and suitable gauge source functions. These constraint additions and gauge source functions eliminate logarithmic divergences ... |
0712.2282 | Albert Roura | Guillem Perez-Nadal, Albert Roura, Enric Verdaguer | Stability of de Sitter spacetime under isotropic perturbations in
semiclassical gravity | 19 pages, REVTeX4 | Phys.Rev.D77:124033,2008 | 10.1103/PhysRevD.77.124033 | LA-UR-07-7066 | gr-qc | null | A spatially flat Robertson-Walker spacetime driven by a cosmological constant
is non-conformally coupled to a massless scalar field. The equations of
semiclassical gravity are explicitly solved for this case, and a
self-consistent de Sitter solution associated with the Bunch-Davies vacuum
state is found (the effect o... | [
{
"created": "Fri, 14 Dec 2007 05:14:45 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Perez-Nadal",
"Guillem",
""
],
[
"Roura",
"Albert",
""
],
[
"Verdaguer",
"Enric",
""
]
] | A spatially flat Robertson-Walker spacetime driven by a cosmological constant is non-conformally coupled to a massless scalar field. The equations of semiclassical gravity are explicitly solved for this case, and a self-consistent de Sitter solution associated with the Bunch-Davies vacuum state is found (the effect of ... |
1507.00331 | El\'ias Castellanos Dr. | El\'ias Castellanos, Celia Escamilla-Rivera | Modified uncertainty principle from the free expansion of a
Bose-Einstein Condensate | 7 pages, 2 figures | Modern Physics Letters A, Vol. 32, No. 2 (2017) 1750007 | 10.1142/S0217732317500079 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present a theoretical and numerical analysis of the free
expansion of a Bose-Einstein condensate, where we assume that the single
particle energy spectrum is deformed due to a possible quantum structure of
spacetime. Also, we consider the presence of interparticle interactions in
order to study more... | [
{
"created": "Wed, 1 Jul 2015 19:52:09 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Sep 2015 18:13:42 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Dec 2016 16:23:05 GMT",
"version": "v3"
}
] | 2016-12-22 | [
[
"Castellanos",
"Elías",
""
],
[
"Escamilla-Rivera",
"Celia",
""
]
] | In this paper, we present a theoretical and numerical analysis of the free expansion of a Bose-Einstein condensate, where we assume that the single particle energy spectrum is deformed due to a possible quantum structure of spacetime. Also, we consider the presence of interparticle interactions in order to study more r... |
2103.03763 | Matteo Luca Ruggiero | Angelo Tartaglia, Matteo Luca Ruggiero | From Kerr to Heisenberg | 8 pages, to appear in Entropy | Entropy 2021, 23(3), this article belongs to the Special Issue
Gravitomagnetism and Quantum Mechanics | 10.3390/e23030315 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider the space-time of a charged mass endowed with an
angular momentum. The geometry is described by the exact Kerr-Newman solution
of the Einstein equations. The peculiar symmetry, though exact, is usually
described in terms of the gravito-magnetic field originated by the angular
momentum of the... | [
{
"created": "Fri, 5 Mar 2021 15:46:18 GMT",
"version": "v1"
}
] | 2021-03-09 | [
[
"Tartaglia",
"Angelo",
""
],
[
"Ruggiero",
"Matteo Luca",
""
]
] | In this paper we consider the space-time of a charged mass endowed with an angular momentum. The geometry is described by the exact Kerr-Newman solution of the Einstein equations. The peculiar symmetry, though exact, is usually described in terms of the gravito-magnetic field originated by the angular momentum of the s... |
2406.03101 | Tayyab Naseer | Tayyab Naseer, M. Sharif, Sana Manzoor, Arooj Fatima | Anisotropic Durgapal-Fuloria Neutron Stars in
$f(\mathcal{R},\mathrm{T}^{2})$ Gravity | 28 pages, 10 figures | Mod. Phys. Lett. A 39(2024)2450048 | 10.1142/S0217732324500482 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main purpose of this paper is to obtain physically stable stellar models
coupled with anisotropic matter distribution in the context of
$f(\mathcal{R},\mathrm{T}^{2})$ theory. For this, we consider a static
spherical geometry and formulate modified field equations containing various
unknowns such as matter determ... | [
{
"created": "Wed, 5 Jun 2024 09:44:06 GMT",
"version": "v1"
}
] | 2024-06-06 | [
[
"Naseer",
"Tayyab",
""
],
[
"Sharif",
"M.",
""
],
[
"Manzoor",
"Sana",
""
],
[
"Fatima",
"Arooj",
""
]
] | The main purpose of this paper is to obtain physically stable stellar models coupled with anisotropic matter distribution in the context of $f(\mathcal{R},\mathrm{T}^{2})$ theory. For this, we consider a static spherical geometry and formulate modified field equations containing various unknowns such as matter determin... |
gr-qc/0511036 | Xiao Zhang | Xiao Zhang | On the relation between ADM and Bondi energy-momenta | 21 pages, final version | Adv.Theor.Math.Phys.10:261-282,2006 | null | null | gr-qc math.DG | null | When a spacetime takes Bondi radiating metric, and is vacuum and
asymptotically flat at spatial infinity which ensures the positive mass
theorem, we prove that the standard ADM energy-momentum is the past limit of
the Bondi energy-momentum. We also derive a formula relating the ADM
energy-momentum of any asymptotical... | [
{
"created": "Tue, 8 Nov 2005 06:33:32 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Dec 2005 15:22:03 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Mar 2006 00:28:23 GMT",
"version": "v3"
},
{
"created": "Sun, 1 Oct 2006 15:24:39 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Zhang",
"Xiao",
""
]
] | When a spacetime takes Bondi radiating metric, and is vacuum and asymptotically flat at spatial infinity which ensures the positive mass theorem, we prove that the standard ADM energy-momentum is the past limit of the Bondi energy-momentum. We also derive a formula relating the ADM energy-momentum of any asymptotically... |
gr-qc/9409009 | Alan Rendall | Alan D. Rendall | Global Properties of Locally Spatially Homogeneous Cosmological Models
with Matter | 18 pages, MPA-AR-94-4 | null | 10.1017/S0305004100073837 | null | gr-qc | null | The existence and nature of singularities in locally spatially homogeneous
solutions of the Einstein equations coupled to various phenomenological matter
models is investigated. It is shown that, under certain reasonable assumptions
on the matter, there are no singularities in an expanding phase of the
evolution and ... | [
{
"created": "Tue, 6 Sep 1994 06:55:59 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Rendall",
"Alan D.",
""
]
] | The existence and nature of singularities in locally spatially homogeneous solutions of the Einstein equations coupled to various phenomenological matter models is investigated. It is shown that, under certain reasonable assumptions on the matter, there are no singularities in an expanding phase of the evolution and th... |
0904.3914 | Simone Speziale | Akihiro Ishibashi and Simone Speziale | Spherically symmetric black holes in minimally modified self-dual
gravity | 42 pages, many colour figures. v2: discussion of the conformal
ambiguity improved, references added. v3: amended to match published version | Class.Quant.Grav.26:175005,2009 | 10.1088/0264-9381/26/17/175005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss spherically symmetric black holes in the modified self-dual theory
of gravity recently studied by Krasnov, obtained adding a Weyl-curvature
dependent `cosmological term' to the Plebanski lagrangian for general
relativity. This type of modified gravity admits two different types of
singularities: one is a t... | [
{
"created": "Fri, 24 Apr 2009 18:10:42 GMT",
"version": "v1"
},
{
"created": "Mon, 4 May 2009 17:54:09 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Jul 2009 09:29:51 GMT",
"version": "v3"
}
] | 2009-08-12 | [
[
"Ishibashi",
"Akihiro",
""
],
[
"Speziale",
"Simone",
""
]
] | We discuss spherically symmetric black holes in the modified self-dual theory of gravity recently studied by Krasnov, obtained adding a Weyl-curvature dependent `cosmological term' to the Plebanski lagrangian for general relativity. This type of modified gravity admits two different types of singularities: one is a tru... |
0812.2325 | Luciano Rezzolla | Luciano Rezzolla | Modelling the final state from binary black-hole coalescences | Submitted to CQG, LISA-7 Special Issue | Class. Quantum Grav. 26 (2009) 094023 | 10.1088/0264-9381/26/9/094023 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Over the last few years enormous progress has been made in the numerical
description of the inspiral and merger of binary black holes. A particular
effort has gone into the modelling of the physical properties of the final
black hole, namely its spin and recoil velocity, as these quantities have
direct impact in astr... | [
{
"created": "Fri, 12 Dec 2008 09:24:31 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Rezzolla",
"Luciano",
""
]
] | Over the last few years enormous progress has been made in the numerical description of the inspiral and merger of binary black holes. A particular effort has gone into the modelling of the physical properties of the final black hole, namely its spin and recoil velocity, as these quantities have direct impact in astrop... |
1105.3861 | Shahar Hadar | Shahar Hadar, Barak Kol, Emanuele Berti and Vitor Cardoso | Comparing numerical and analytical calculations of post-ISCO ringdown
amplitudes | 4 pages, 2 figures | Phys.Rev.D84:047501,2011 | 10.1103/PhysRevD.84.047501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We numerically compute the ringdown amplitudes following the plunge of a
particle from the innermost stable circular orbit (ISCO) of a Schwarzschild
black hole in the extreme-mass ratio limit. We show that the ringdown
amplitudes computed in this way are in good agreement with a recent analytical
calculation arXiv:09... | [
{
"created": "Thu, 19 May 2011 13:06:43 GMT",
"version": "v1"
}
] | 2011-08-12 | [
[
"Hadar",
"Shahar",
""
],
[
"Kol",
"Barak",
""
],
[
"Berti",
"Emanuele",
""
],
[
"Cardoso",
"Vitor",
""
]
] | We numerically compute the ringdown amplitudes following the plunge of a particle from the innermost stable circular orbit (ISCO) of a Schwarzschild black hole in the extreme-mass ratio limit. We show that the ringdown amplitudes computed in this way are in good agreement with a recent analytical calculation arXiv:0911... |
2011.11093 | S. N Sajadi | S. H. Hendi, N. Riazi, S. N. Sajadi | Z2-Symmetric Thick Brane with Specific Warp Function | 17 pages, 6 figures, Accepted in PRD | null | 10.1103/PhysRevD.102.124034 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we investigate a new warped five-dimensional, Z2-symmetric
thick brane solution in the presence of a real scalar field. We examine the
different geometric aspects of the model. We discuss the stability of the
solution under gravitational fluctuations and study both the graviton ground
state and the cont... | [
{
"created": "Sun, 22 Nov 2020 19:34:40 GMT",
"version": "v1"
}
] | 2020-12-23 | [
[
"Hendi",
"S. H.",
""
],
[
"Riazi",
"N.",
""
],
[
"Sajadi",
"S. N.",
""
]
] | In this work, we investigate a new warped five-dimensional, Z2-symmetric thick brane solution in the presence of a real scalar field. We examine the different geometric aspects of the model. We discuss the stability of the solution under gravitational fluctuations and study both the graviton ground state and the contin... |
1906.08000 | LSC P&P Committee | The LIGO Scientific Collaboration and the Virgo Collaboration: B. P.
Abbott, R. Abbott, T. D. Abbott, S. Abraham, F. Acernese, K. Ackley, A.
Adams, C. Adams, R. X. Adhikari, V. B. Adya, C. Affeldt, M. Agathos, K.
Agatsuma, N. Aggarwal, O. D. Aguiar, L. Aiello, A. Ain, P. Ajith, G. Allen,
A. Allocca, M. A. Aloy,... | Search for intermediate mass black hole binaries in the first and second
observing runs of the Advanced LIGO and Virgo network | main paper: 14 pages, 2 figures and 1 table : total with appendices
19 pages, 2 figures and 2 tables | Phys. Rev. D 100, 064064 (2019) | 10.1103/PhysRevD.100.064064 | LIGO-P1900045 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave astronomy has been firmly established with the detection
of gravitational waves from the merger of ten stellar mass binary black holes
and a neutron star binary. This paper reports on the all-sky search for
gravitational waves from intermediate mass black hole binaries in the first and
second obser... | [
{
"created": "Wed, 19 Jun 2019 09:46:50 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jul 2019 12:41:15 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Jan 2020 17:54:15 GMT",
"version": "v3"
}
] | 2020-01-27 | [
[
"The LIGO Scientific Collaboration",
"",
""
],
[
"the Virgo Collaboration",
"",
""
],
[
"Abbott",
"B. P.",
""
],
[
"Abbott",
"R.",
""
],
[
"Abbott",
"T. D.",
""
],
[
"Abraham",
"S.",
""
],
[
"Acernese",
"F.",
... | Gravitational wave astronomy has been firmly established with the detection of gravitational waves from the merger of ten stellar mass binary black holes and a neutron star binary. This paper reports on the all-sky search for gravitational waves from intermediate mass black hole binaries in the first and second observi... |
1701.02963 | Elias Okon | Elias Okon and Daniel Sudarsky | The weight of collapse: dynamical reduction models in general
relativistic contexts | 25 pages, 1 figure | null | null | null | gr-qc physics.hist-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by possible connections between gravity and foundational question in
quantum theory, we consider an approach for the adaptation of objective
collapse models to a general relativistic context. We apply these ideas to a
list of open problems in cosmology and quantum gravity, such as the emergence
of seeds of c... | [
{
"created": "Wed, 11 Jan 2017 13:13:24 GMT",
"version": "v1"
}
] | 2017-01-12 | [
[
"Okon",
"Elias",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | Inspired by possible connections between gravity and foundational question in quantum theory, we consider an approach for the adaptation of objective collapse models to a general relativistic context. We apply these ideas to a list of open problems in cosmology and quantum gravity, such as the emergence of seeds of cos... |
2402.16533 | Chad Henshaw | Chad Henshaw, Megan Arogeti, Alice Heranval, Laura Cadonati | Visualization of frequency structures in gravitational wave signals | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational wave signals produced by the coalescence of compact
binaries progress through three stages: inspiral, merger, and postmerger. The
evolution of their frequency follows a slow build up during the inspiral that
peaks at merger, forming the characteristic "chirp" pattern in the signal's
time-frequency m... | [
{
"created": "Mon, 26 Feb 2024 12:31:11 GMT",
"version": "v1"
}
] | 2024-02-27 | [
[
"Henshaw",
"Chad",
""
],
[
"Arogeti",
"Megan",
""
],
[
"Heranval",
"Alice",
""
],
[
"Cadonati",
"Laura",
""
]
] | The gravitational wave signals produced by the coalescence of compact binaries progress through three stages: inspiral, merger, and postmerger. The evolution of their frequency follows a slow build up during the inspiral that peaks at merger, forming the characteristic "chirp" pattern in the signal's time-frequency map... |
gr-qc/0404093 | Vitor Cardoso | Vitor Cardoso | Quasinormal Modes and Gravitational Radiation in Black Hole Spacetimes | PhD thesis, Instituto Superior Tecnico, December 2003. 206 pages | null | null | null | gr-qc astro-ph hep-th | null | Black holes play a fundamental role in modern physics. They have
characteristic oscillation modes, called quasinormal modes. Past studies have
shown that these modes are important to our understanding of the dynamics of
astrophysical black holes. Recent studies indicate that they are important as a
link between gravi... | [
{
"created": "Wed, 21 Apr 2004 15:17:49 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Cardoso",
"Vitor",
""
]
] | Black holes play a fundamental role in modern physics. They have characteristic oscillation modes, called quasinormal modes. Past studies have shown that these modes are important to our understanding of the dynamics of astrophysical black holes. Recent studies indicate that they are important as a link between gravita... |
1606.07177 | Woei Chet Lim | Alan Coley, Daniele Gregoris, Woei Chet Lim | On the first $G_1$ stiff fluid spike solution in General Relativity | 13 pages, 1 figure. Figure updated. Minor changes to match published
version | Class. Quantum Grav. 33 (2016) 215010 | 10.1088/0264-9381/33/21/215010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Geroch transformation we obtain the first example of an exact stiff
fluid spike solution to the Einstein field equations in a closed form
exhibiting a spacelike $G_1$ group of symmetries (i.e., with a single
isometry). This new solution is of Petrov type I and exhibits a spike crossing
which persists to the... | [
{
"created": "Thu, 23 Jun 2016 04:11:18 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jul 2016 03:37:51 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Oct 2016 21:42:01 GMT",
"version": "v3"
}
] | 2016-10-17 | [
[
"Coley",
"Alan",
""
],
[
"Gregoris",
"Daniele",
""
],
[
"Lim",
"Woei Chet",
""
]
] | Using the Geroch transformation we obtain the first example of an exact stiff fluid spike solution to the Einstein field equations in a closed form exhibiting a spacelike $G_1$ group of symmetries (i.e., with a single isometry). This new solution is of Petrov type I and exhibits a spike crossing which persists to the p... |
gr-qc/0404107 | Lorenzo Iorio | Lorenzo Iorio | On the impossibility of using the longitude of the ascending node of
GP-B for measuring the Lense-Thirring effect | LaTex, 10 pages, 1 table, no figures. References added. Small changes
in the Introduction. References updated. To appear in General Relativity and
Gravitation | Gen.Rel.Grav. 37 (2005) 391-398 | 10.1007/s10714-005-0026-y | null | gr-qc astro-ph | null | The possibility of analyzing the node Omega of the GP-B satellite in order to
measure also the Lense-Thirring effect on its orbit is examined. This feature
is induced by the general relativistic gravitomagnetic component of the Earth
gravitational field. The GP-B mission has been launched in April 2004 and is
aimed m... | [
{
"created": "Mon, 26 Apr 2004 22:03:35 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Apr 2004 14:43:03 GMT",
"version": "v2"
},
{
"created": "Thu, 20 May 2004 13:36:25 GMT",
"version": "v3"
},
{
"created": "Tue, 15 Jun 2004 14:25:03 GMT",
"version": "v4"
},
{
"c... | 2007-05-23 | [
[
"Iorio",
"Lorenzo",
""
]
] | The possibility of analyzing the node Omega of the GP-B satellite in order to measure also the Lense-Thirring effect on its orbit is examined. This feature is induced by the general relativistic gravitomagnetic component of the Earth gravitational field. The GP-B mission has been launched in April 2004 and is aimed mai... |
1906.04546 | Nils Andersson | K. Chakravarti and N. Andersson | Exploring universality in neutron star mergers | 6 pages, 5 figures, MNRAS style | null | 10.1093/mnras/staa2342 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the correlation between the pre-merger tidal deformability and the
post-merger remnant oscillations seen in numerical simulation of neutron star
binaries, with the aim of understanding to what extent the physics support the
existence of such a relation. We consider the impact of thermal and rotational
effe... | [
{
"created": "Tue, 11 Jun 2019 13:03:02 GMT",
"version": "v1"
}
] | 2020-09-02 | [
[
"Chakravarti",
"K.",
""
],
[
"Andersson",
"N.",
""
]
] | We explore the correlation between the pre-merger tidal deformability and the post-merger remnant oscillations seen in numerical simulation of neutron star binaries, with the aim of understanding to what extent the physics support the existence of such a relation. We consider the impact of thermal and rotational effect... |
2310.10122 | Omar Mustafa | Omar Mustafa | Klein-Gordon particles in a quasi-pointlike global monopole spacetime
and a Wu-Yang magnetic monopole: invariance and isospectrality | 15 pages, 7 figures | J. Phys. G: Nucl. Part. Phys. 51 (2024) 055201 | 10.1088/1361-6471/ad3331 | null | gr-qc hep-ph math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We use two correlated metric functions and transform/deform the pointlike
global monopole (PGM) spacetime metric into a quasi-PGM (QPGM) spacetime one.
We study Klein-Gordon (KG) particles (manifestly introduced by the non-minimal
coupling form of the operator $% \tilde{D}_{\mu }=D_{\mu }+\mathcal{F}_{\mu }$,
with $\... | [
{
"created": "Mon, 16 Oct 2023 06:58:03 GMT",
"version": "v1"
}
] | 2024-04-17 | [
[
"Mustafa",
"Omar",
""
]
] | We use two correlated metric functions and transform/deform the pointlike global monopole (PGM) spacetime metric into a quasi-PGM (QPGM) spacetime one. We study Klein-Gordon (KG) particles (manifestly introduced by the non-minimal coupling form of the operator $% \tilde{D}_{\mu }=D_{\mu }+\mathcal{F}_{\mu }$, with $\ma... |
1806.08949 | Kourosh Nozari | Kh. Salahshoor and Kourosh Nozari | Circular orbits and accretion process in a class of Horndeski/Galileon
black holes | 35 Pages, 10 Figures | Eur. Phys. J. C 78 (2018) 486 | 10.1140/epjc/s10052-018-5946-2 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper the geodesics motion and accretion process around a subclass of
Horndeski/Galileon black holes are investigated. Firstly, we present
spherically symmetric geometries in a Horndeski/Galileon black hole spacetime
by considering an isothermal fluid around the black hole. Then we focus on
three main issues:... | [
{
"created": "Sat, 23 Jun 2018 11:39:25 GMT",
"version": "v1"
}
] | 2018-06-26 | [
[
"Salahshoor",
"Kh.",
""
],
[
"Nozari",
"Kourosh",
""
]
] | In this paper the geodesics motion and accretion process around a subclass of Horndeski/Galileon black holes are investigated. Firstly, we present spherically symmetric geometries in a Horndeski/Galileon black hole spacetime by considering an isothermal fluid around the black hole. Then we focus on three main issues: i... |
2203.04824 | Jose Geraldo Pereira | A. V. Araujo, D. F. L\'opez, J. G. Pereira, J. R. Salazar | De Sitter-invariant approach to cosmology | 16 pages, 1 figure. V4: Presentation changes aiming at clarifying and
updating the text. Chapter in: "Tribute to Ruben Aldrovandi", F. Caruso, J.G.
Pereira, A. Santoro (eds.) (Editora Livraria da F\'isica, S\~ao Paulo, 2024),
pages 37-56 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spacetime short-distance structure at the Planck scale is governed by the
Planck length, usually interpreted as a three-dimensional Euclidian length. As
such, it is not Lorentz invariant and clashes with Einstein's special
relativity, which is thus unable to describe the Planck scale kinematics. The
solution to t... | [
{
"created": "Wed, 9 Mar 2022 15:56:23 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Nov 2022 11:30:41 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Jul 2023 14:30:40 GMT",
"version": "v3"
},
{
"created": "Wed, 20 Mar 2024 15:47:11 GMT",
"version": "v4"
}
] | 2024-03-21 | [
[
"Araujo",
"A. V.",
""
],
[
"López",
"D. F.",
""
],
[
"Pereira",
"J. G.",
""
],
[
"Salazar",
"J. R.",
""
]
] | The spacetime short-distance structure at the Planck scale is governed by the Planck length, usually interpreted as a three-dimensional Euclidian length. As such, it is not Lorentz invariant and clashes with Einstein's special relativity, which is thus unable to describe the Planck scale kinematics. The solution to thi... |
2307.03142 | Tapobrata Sarkar | Debojyoti Garain, Pritam Banerjee, Shaswata Chowdhury, Tapobrata
Sarkar | Tidal disruption of white dwarfs in a modified gravity theory with SPH | 23 Pages | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Low energy imprints of modifications to general relativity are often found in
pressure balance equations inside stars. These modifications are then amenable
to tests via astrophysical phenomena, using observational effects in stellar
astrophysics that crucially depend on such equations. One such effect is tidal
disru... | [
{
"created": "Thu, 6 Jul 2023 17:11:24 GMT",
"version": "v1"
}
] | 2023-07-07 | [
[
"Garain",
"Debojyoti",
""
],
[
"Banerjee",
"Pritam",
""
],
[
"Chowdhury",
"Shaswata",
""
],
[
"Sarkar",
"Tapobrata",
""
]
] | Low energy imprints of modifications to general relativity are often found in pressure balance equations inside stars. These modifications are then amenable to tests via astrophysical phenomena, using observational effects in stellar astrophysics that crucially depend on such equations. One such effect is tidal disrupt... |
1707.00939 | Shahab Shahidi | Zahra Haghani, Tiberiu Harko and Shahab Shahidi | The Einstein dark energy model | 17 pages, 4 figures | Phys. Dark Univ. 21 (2018) 27 | 10.1016/j.dark.2018.05.006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 1919 Einstein tried to solve the problem of the structure of matter by
assuming that the elementary particles are held together solely by
gravitational forces. In addition, Einstein also assumed the presence inside
matter of electromagnetic interactions. Einstein showed that the cosmological
constant can be interp... | [
{
"created": "Tue, 4 Jul 2017 12:27:38 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2018 18:37:10 GMT",
"version": "v2"
}
] | 2021-04-19 | [
[
"Haghani",
"Zahra",
""
],
[
"Harko",
"Tiberiu",
""
],
[
"Shahidi",
"Shahab",
""
]
] | In 1919 Einstein tried to solve the problem of the structure of matter by assuming that the elementary particles are held together solely by gravitational forces. In addition, Einstein also assumed the presence inside matter of electromagnetic interactions. Einstein showed that the cosmological constant can be interpre... |
1607.05146 | Richard Brito | Richard Brito | Fundamental fields around compact objects: Massive spin-2 fields,
Superradiant instabilities and Stars with dark matter cores | PhD thesis, 211 pages | null | null | null | gr-qc astro-ph.CO astro-ph.SR hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Fundamental bosonic fields of arbitrary spin are predicted by generic
extensions of the Standard Model and of General Relativity, and are
well-motivated candidates to explain the dark components of the Universe. One
of most promising channels to look for their presence is through their
gravitational interaction with ... | [
{
"created": "Mon, 18 Jul 2016 15:56:07 GMT",
"version": "v1"
}
] | 2016-07-19 | [
[
"Brito",
"Richard",
""
]
] | Fundamental bosonic fields of arbitrary spin are predicted by generic extensions of the Standard Model and of General Relativity, and are well-motivated candidates to explain the dark components of the Universe. One of most promising channels to look for their presence is through their gravitational interaction with co... |
1206.2403 | Edward Anderson | Edward Anderson | Problem of Time in Quantum Gravity | Invited Review: 26 pages including 2 Figures. This v2 has a number of
minor improvements and corrections | Annalen der Physik, Vol 524 pp 757-786 (2012) | 10.1002/andp.201200147 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Problem of Time occurs because the `time' of GR and of ordinary Quantum
Theory are mutually incompatible notions. This is problematic in trying to
replace these two branches of physics with a single framework in situations in
which the conditions of both apply, e.g. in black holes or in the very early
universe. E... | [
{
"created": "Mon, 11 Jun 2012 23:32:42 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Aug 2012 02:56:36 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Anderson",
"Edward",
""
]
] | The Problem of Time occurs because the `time' of GR and of ordinary Quantum Theory are mutually incompatible notions. This is problematic in trying to replace these two branches of physics with a single framework in situations in which the conditions of both apply, e.g. in black holes or in the very early universe. Emp... |
2201.06706 | Yun Soo Myung | Yun Soo Myung | Revisiting superradiant stability of Kerr-Newman black holes under a
charged massive scalar | 20 pages, 12 figures, version to appear in EPJC | null | 10.1140/epjc/s10052-022-10476-w | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the superradiant stability of Kerr-Newman black holes under a
charged massive scalar perturbation. We obtain a newly suitable potential which
is not singular at the outer horizon when a radial equation is expressed the
Schr\"{o}dinger-type equation in terms of the tortoise coordinate. From the
potential an... | [
{
"created": "Tue, 18 Jan 2022 02:30:21 GMT",
"version": "v1"
},
{
"created": "Mon, 30 May 2022 22:13:10 GMT",
"version": "v2"
}
] | 2022-06-29 | [
[
"Myung",
"Yun Soo",
""
]
] | We revisit the superradiant stability of Kerr-Newman black holes under a charged massive scalar perturbation. We obtain a newly suitable potential which is not singular at the outer horizon when a radial equation is expressed the Schr\"{o}dinger-type equation in terms of the tortoise coordinate. From the potential anal... |
gr-qc/0104093 | L. Arturo Urena-Lopez | L. Arturo Urena-Lopez (CINVESTAV) | Oscillatons revisited | 10 pages REVTeX, 10 eps figures. Updated files to match version
published in Classical and Quantum Gravity | Class.Quant.Grav. 19 (2002) 2617-2632 | 10.1088/0264-9381/19/10/307 | null | gr-qc astro-ph | null | In this paper, we study some interesting properties of a spherically
symmetric oscillating soliton star made of a real time-dependent scalar field
which is called an oscillaton. The known final configuration of an oscillaton
consists of a stationary stage in which the scalar field and the metric
coefficients oscillat... | [
{
"created": "Fri, 27 Apr 2001 19:57:27 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jul 2001 21:06:44 GMT",
"version": "v2"
},
{
"created": "Fri, 16 Aug 2002 10:57:41 GMT",
"version": "v3"
}
] | 2009-11-07 | [
[
"Urena-Lopez",
"L. Arturo",
"",
"CINVESTAV"
]
] | In this paper, we study some interesting properties of a spherically symmetric oscillating soliton star made of a real time-dependent scalar field which is called an oscillaton. The known final configuration of an oscillaton consists of a stationary stage in which the scalar field and the metric coefficients oscillate ... |
2405.05568 | Suman Kumar Panja | Dilip Kumar, Suman Kumar Panja, Abhisek Saha and Soma Sanyal | Geodesic motion of particles in the vicinity of the $\kappa$-deformed
Schwarzchild Black Hole | 16 pages, 8 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we investigate the geodesic motion of a test particle around
the Schwarzchild black hole in a $\kappa$-deformed space-time. We compute a
modified Lagrangian to obtain the $\kappa$-deformed effective potential and
find the particle trajectories based on the constants of motion. For the same
value of ang... | [
{
"created": "Thu, 9 May 2024 06:22:46 GMT",
"version": "v1"
}
] | 2024-05-10 | [
[
"Kumar",
"Dilip",
""
],
[
"Panja",
"Suman Kumar",
""
],
[
"Saha",
"Abhisek",
""
],
[
"Sanyal",
"Soma",
""
]
] | In this study, we investigate the geodesic motion of a test particle around the Schwarzchild black hole in a $\kappa$-deformed space-time. We compute a modified Lagrangian to obtain the $\kappa$-deformed effective potential and find the particle trajectories based on the constants of motion. For the same value of angul... |
gr-qc/9508058 | Lee Lindblom | Lee Lindblom | The Relaxation Effect in Dissipative Relativistic Fluid Theories | Plain TeX -- 16 Pages | null | 10.1006/aphy.1996.0036 | null | gr-qc | null | The dynamics of the fluid fields in a large class of causal dissipative fluid
theories is studied. It is shown that the physical fluid states in these
theories must relax (on a time scale that is characteristic of the microscopic
particle interactions) to ones that are essentially indistinguishable from the
simple re... | [
{
"created": "Mon, 28 Aug 1995 20:23:38 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Lindblom",
"Lee",
""
]
] | The dynamics of the fluid fields in a large class of causal dissipative fluid theories is studied. It is shown that the physical fluid states in these theories must relax (on a time scale that is characteristic of the microscopic particle interactions) to ones that are essentially indistinguishable from the simple rela... |
gr-qc/9910097 | Ulrich H. Gerlach | Ulrich H. Gerlach | Minkowski Bessel modes | 18 pages, 2 postscript figures, PlainTex. Related papers also
available at http://www.math.ohio-state.edu/~gerlach | Phys.Rev.D38:514-521,1988 | 10.1103/PhysRevD.38.514 | null | gr-qc | null | The global Minkowski Bessel (M-B) modes, whose explicit form allows the
identification and description of the condensed vacuum state resulting from the
operation of a pair of accelerated refrigerators, are introduced. They span the
representation space of the unitary representation of the Poincare group on 2-D
Lorent... | [
{
"created": "Tue, 26 Oct 1999 18:47:19 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Gerlach",
"Ulrich H.",
""
]
] | The global Minkowski Bessel (M-B) modes, whose explicit form allows the identification and description of the condensed vacuum state resulting from the operation of a pair of accelerated refrigerators, are introduced. They span the representation space of the unitary representation of the Poincare group on 2-D Lorentz ... |
2208.07972 | Vasilis Oikonomou | S.D. Odintsov, V.K. Oikonomou | Dissimilar Donuts in the Sky? Effects of a Pressure Singularity on the
Circular Photon Orbits and Shadow of a Cosmological Black Hole | EPL Accepted | null | 10.1209/0295-5075/ac8a13 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The black hole observations obtained so far indicate one thing: similar
"donuts" exist in the sky. But what if some of the observed black hole shadows
that will obtained in the future are different from the others? In this work
the aim is to show that a difference in the shadow of some observed black holes
in the fut... | [
{
"created": "Tue, 16 Aug 2022 22:03:08 GMT",
"version": "v1"
}
] | 2022-09-07 | [
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | The black hole observations obtained so far indicate one thing: similar "donuts" exist in the sky. But what if some of the observed black hole shadows that will obtained in the future are different from the others? In this work the aim is to show that a difference in the shadow of some observed black holes in the futur... |
2406.10070 | M.V.S. Saketh | M. V. S. Saketh, Elisa Maggio | Quasinormal modes of slowly-spinning horizonless compact objects | 12 pages + 7 pages (appendix), 8 figures, V2 (Minor edits) | null | null | null | gr-qc astro-ph.HE hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | One of the main predictions of general relativity is the existence of black
holes featuring a horizon beyond which nothing can escape. Gravitational waves
from the remnants of compact binary coalescences have the potential to probe
new physics close to the black hole horizons. This prospect is of particular
interest ... | [
{
"created": "Fri, 14 Jun 2024 14:24:45 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jun 2024 10:32:17 GMT",
"version": "v2"
}
] | 2024-06-24 | [
[
"Saketh",
"M. V. S.",
""
],
[
"Maggio",
"Elisa",
""
]
] | One of the main predictions of general relativity is the existence of black holes featuring a horizon beyond which nothing can escape. Gravitational waves from the remnants of compact binary coalescences have the potential to probe new physics close to the black hole horizons. This prospect is of particular interest gi... |
gr-qc/0106076 | Shijun Yoshida | Shijun Yoshida, Toshifumi Futamase | R-mode Instability of Slowly Rotating Non-isentropic Relativistic Stars | 10 pages, 4 figures, accepted for publlication in PRD | Phys.Rev.D64:123001,2001 | 10.1103/PhysRevD.64.123001 | null | gr-qc astro-ph | null | We investigate properties of $r$-mode instability in slowly rotating
relativistic polytropes. Inside the star slow rotation and low frequency
formalism that was mainly developed by Kojima is employed to study axial
oscillations restored by Coriolis force. At the stellar surface, in order to
take account of gravitatio... | [
{
"created": "Mon, 25 Jun 2001 07:34:29 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Aug 2001 02:00:14 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Yoshida",
"Shijun",
""
],
[
"Futamase",
"Toshifumi",
""
]
] | We investigate properties of $r$-mode instability in slowly rotating relativistic polytropes. Inside the star slow rotation and low frequency formalism that was mainly developed by Kojima is employed to study axial oscillations restored by Coriolis force. At the stellar surface, in order to take account of gravitationa... |
1709.10309 | Cristian Stelea | Cristian Stelea | On double-black hole solutions of the Einstein-Maxwell-Dilaton theory in
five dimensions | 19 pages, no figures. v.2 significant revision, new sections added | Phys. Rev. D 97, 024044 (2018) | 10.1103/PhysRevD.97.024044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a solution-generating technique that will map a static charged
solution of the Einstein-Maxwell theory in four (or five) dimensions to a
five-dimensional solution of the Einstein-Maxwell-Dilaton theory. As examples
of this technique first we show first how to construct the dilatonic version of
the Reissne... | [
{
"created": "Fri, 29 Sep 2017 10:00:31 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2017 13:57:21 GMT",
"version": "v2"
}
] | 2018-02-07 | [
[
"Stelea",
"Cristian",
""
]
] | We describe a solution-generating technique that will map a static charged solution of the Einstein-Maxwell theory in four (or five) dimensions to a five-dimensional solution of the Einstein-Maxwell-Dilaton theory. As examples of this technique first we show first how to construct the dilatonic version of the Reissner-... |
gr-qc/9908064 | Djordje Sijacki | Dj. Sijacki | Towards Hypergravity | 3 pages, LaTeX2e, mprocl.sty | in "Proc. of the Eight Marcel Grossmann Meeting on General
Relativity", T. Piran ed. (World Scientific Pub., 1999) pp. 482-484 | null | null | gr-qc | null | The aim of this paper is to discuss a kinematical algebraic structure of a
theory of gravity, that would be unitary, renormalizable and coupled in the
same manner to both spinorial and tensorial matter fields. An analysis of the
common features as well as differences of the Yang-Mills theories and gauge
theories of g... | [
{
"created": "Wed, 25 Aug 1999 11:48:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sijacki",
"Dj.",
""
]
] | The aim of this paper is to discuss a kinematical algebraic structure of a theory of gravity, that would be unitary, renormalizable and coupled in the same manner to both spinorial and tensorial matter fields. An analysis of the common features as well as differences of the Yang-Mills theories and gauge theories of gra... |
1505.06402 | Richard Woodard | Shun-Pei Miao (National Cheng Kung University, Taiwan) and Richard P.
Woodard (University of Florida) | Strange Work in Strange Places: Quantum Field Theory in Curved Space | 48 pages, 10 figures, uses PDFLaTeX, English version of a popular
science article for a Chinese-language book celebrating the 100th anniversary
of General Relativity, prepared by members of the Gravitation Society of
Taiwan, edited by Hoi-Lai Yu | null | null | UFIFT-QG-15-01 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Astronomers seem to be observing the fossilized remnants of quantum
gravitational processes which took place during the epoch of {\it primordial
inflation} that is conjectured to have occurred during the first $10^{-32}$
seconds of cosmic history. We give a non-technical description of what causes
these processes and... | [
{
"created": "Sun, 24 May 2015 03:49:08 GMT",
"version": "v1"
}
] | 2015-05-26 | [
[
"Miao",
"Shun-Pei",
"",
"National Cheng Kung University, Taiwan"
],
[
"Woodard",
"Richard P.",
"",
"University of Florida"
]
] | Astronomers seem to be observing the fossilized remnants of quantum gravitational processes which took place during the epoch of {\it primordial inflation} that is conjectured to have occurred during the first $10^{-32}$ seconds of cosmic history. We give a non-technical description of what causes these processes and h... |
1706.06294 | Adrien Bourgoin | Adrien Bourgoin, Christophe Le Poncin-Lafitte, Aur\'elien Hees,
S\'ebastien Bouquillon, G\'erard Francou, and Marie-Christine Angonin | Lorentz Symmetry Violations from Matter-Gravity Couplings with Lunar
Laser Ranging | null | Phys. Rev. Lett. 119, 201102 (2017) | 10.1103/PhysRevLett.119.201102 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The standard-model extension (SME) is an effective field theory framework
aiming at parametrizing any violation to the Lorentz symmetry (LS) in all
sectors of physics. In this Letter, we report the first direct experimental
measurement of SME coefficients performed simultaneously within two sectors of
the SME framewo... | [
{
"created": "Tue, 20 Jun 2017 07:30:20 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Nov 2017 12:24:32 GMT",
"version": "v2"
},
{
"created": "Tue, 21 Nov 2017 08:54:38 GMT",
"version": "v3"
}
] | 2017-11-22 | [
[
"Bourgoin",
"Adrien",
""
],
[
"Poncin-Lafitte",
"Christophe Le",
""
],
[
"Hees",
"Aurélien",
""
],
[
"Bouquillon",
"Sébastien",
""
],
[
"Francou",
"Gérard",
""
],
[
"Angonin",
"Marie-Christine",
""
]
] | The standard-model extension (SME) is an effective field theory framework aiming at parametrizing any violation to the Lorentz symmetry (LS) in all sectors of physics. In this Letter, we report the first direct experimental measurement of SME coefficients performed simultaneously within two sectors of the SME framework... |
gr-qc/0506078 | Ramesh Narayan | Ramesh Narayan | Black Holes in Astrophysics | To appear in a forthcoming Special Focus Issue on "Spacetime 100
Years Later" published by the New Journal of Physics
(http://www.iop.org/EJ/njp) The article, finalized in October, 2004, consists
of 21 pages of text, 3 figures and 6 movies (found at
http://www.cfa.harvard.edu/~narayan/NJP) | New J.Phys.7:199,2005 | 10.1088/1367-2630/7/1/199 | null | gr-qc astro-ph hep-th | null | This article reviews the current status of black hole astrophysics, focusing
on topics of interest to a physics audience. Astronomers have discovered dozens
of compact objects with masses greater than 3 solar masses, the likely maximum
mass of a neutron star. These objects are identified as black hole candidates.
Som... | [
{
"created": "Tue, 14 Jun 2005 15:59:48 GMT",
"version": "v1"
}
] | 2011-05-10 | [
[
"Narayan",
"Ramesh",
""
]
] | This article reviews the current status of black hole astrophysics, focusing on topics of interest to a physics audience. Astronomers have discovered dozens of compact objects with masses greater than 3 solar masses, the likely maximum mass of a neutron star. These objects are identified as black hole candidates. Some ... |
1412.8150 | Sunil Maharaj | Jefta M. Sunzu, Sunil D. Maharaj, Subharthi Ray | Quark star model with charged anisotropic matter | 9 pages, Submitted for publication | Astrophys. Space Sci. 354: 517-524 (2014) | 10.1007/s10509-014-2131-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find two new classes of exact solutions to the Einstein-Maxwell system of
equations. The matter distribution satisfies a linear equation of state
consistent with quark matter. The field equations are integrated by specifying
forms for the measure of anisotropy and a gravitational potential which are
physically rea... | [
{
"created": "Sun, 28 Dec 2014 11:23:42 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Sunzu",
"Jefta M.",
""
],
[
"Maharaj",
"Sunil D.",
""
],
[
"Ray",
"Subharthi",
""
]
] | We find two new classes of exact solutions to the Einstein-Maxwell system of equations. The matter distribution satisfies a linear equation of state consistent with quark matter. The field equations are integrated by specifying forms for the measure of anisotropy and a gravitational potential which are physically reaso... |
gr-qc/9406026 | Jerzy Lewandowski | Jerzy lewandowski | Differential Geometry for the Space of Connections Modulo Gauge
Transformations | 3 pp, Proceedings of ``Cornelius Lanczos International Centenary
Conference'' (1994) | null | null | null | gr-qc | null | (This short article is a continuation of a longer, review work, in the same
volume of Proceedings, by Ashtekar, Marolf and Mour\~ao [gr-qc/9403042]. All
the details and other results are to be found in joint papers of the author
with Abhay Ashtekar.) The projective limit technics derived for spaces of
connections are... | [
{
"created": "Thu, 16 Jun 1994 14:12:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"lewandowski",
"Jerzy",
""
]
] | (This short article is a continuation of a longer, review work, in the same volume of Proceedings, by Ashtekar, Marolf and Mour\~ao [gr-qc/9403042]. All the details and other results are to be found in joint papers of the author with Abhay Ashtekar.) The projective limit technics derived for spaces of connections are e... |
2304.13254 | Maximiliano Isi | Maximiliano Isi, Will M. Farr, Vijay Varma | The directional isotropy of LIGO-Virgo binaries | null | ApJ 962 19 (2024) | 10.3847/1538-4357/ad0ec9 | LIGO-P2300088 | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We demonstrate how to constrain the degree of absolute alignment of the total
angular momenta of LIGO-Virgo binary black holes, looking for a special
direction in space that would break isotropy. We also allow for inhomogeneities
in the distribution of black holes over the sky. Making use of dipolar models
for the sp... | [
{
"created": "Wed, 26 Apr 2023 02:54:27 GMT",
"version": "v1"
}
] | 2024-02-07 | [
[
"Isi",
"Maximiliano",
""
],
[
"Farr",
"Will M.",
""
],
[
"Varma",
"Vijay",
""
]
] | We demonstrate how to constrain the degree of absolute alignment of the total angular momenta of LIGO-Virgo binary black holes, looking for a special direction in space that would break isotropy. We also allow for inhomogeneities in the distribution of black holes over the sky. Making use of dipolar models for the spat... |
gr-qc/9406036 | null | Chris M. Chambers and Ian G. Moss | A Cosmological No-Hair Theorem | 9 pages, NCL94 -TP4, (Revtex) | Phys.Rev.Lett. 73 (1994) 617-620 | 10.1103/PhysRevLett.73.617 | null | gr-qc | null | A generalisation of Price's theorem is given for application to Inflationary
Cosmologies. Namely, we show that on a Schwarzschild--de Sitter background
there are no static solutions to the wave or gravitational perturbation
equations for modes with angular momentum greater than their intrinsic spin.
| [
{
"created": "Tue, 21 Jun 1994 16:27:56 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Chambers",
"Chris M.",
""
],
[
"Moss",
"Ian G.",
""
]
] | A generalisation of Price's theorem is given for application to Inflationary Cosmologies. Namely, we show that on a Schwarzschild--de Sitter background there are no static solutions to the wave or gravitational perturbation equations for modes with angular momentum greater than their intrinsic spin. |
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