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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1402.1038 | Norbert Bodendorfer | Norbert Bodendorfer | A note on entanglement entropy and quantum geometry | 14 pages. v2: journal version. Comment added | Class. Quantum Grav. 31 (2014) 214004 | 10.1088/0264-9381/31/21/214004 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been argued that the entropy which one is computing in the isolated
horizon framework of loop quantum gravity is closely related to the
entanglement entropy of the gravitational field and that the calculation
performed is not restricted to horizons. We recall existing work on this issue
and explain how recent ... | [
{
"created": "Wed, 5 Feb 2014 13:45:26 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Nov 2014 11:31:58 GMT",
"version": "v2"
}
] | 2014-11-25 | [
[
"Bodendorfer",
"Norbert",
""
]
] | It has been argued that the entropy which one is computing in the isolated horizon framework of loop quantum gravity is closely related to the entanglement entropy of the gravitational field and that the calculation performed is not restricted to horizons. We recall existing work on this issue and explain how recent wo... |
1303.0174 | Jean-Philippe Bruneton | Jean-Philippe Bruneton | MG13 Proceedings: A lattice Universe as a toy-model for inhomogeneous
cosmology | 3 pages, no figures. Prepared for MG13 conference | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly report on a previously found new, approximate, solution to
Einstein field equations, describing a cubic lattice of spherical masses. This
model mimics in a satisfactory way a Universe which can be strongly
inhomogeneous at small scales, but quite homogeneous at large ones. As a
consequence of field equatio... | [
{
"created": "Fri, 1 Mar 2013 14:10:47 GMT",
"version": "v1"
}
] | 2013-03-04 | [
[
"Bruneton",
"Jean-Philippe",
""
]
] | We briefly report on a previously found new, approximate, solution to Einstein field equations, describing a cubic lattice of spherical masses. This model mimics in a satisfactory way a Universe which can be strongly inhomogeneous at small scales, but quite homogeneous at large ones. As a consequence of field equations... |
1612.07970 | Ernesto Barrientos | E. Barrientos, S. Mendoza | MOND as the weak field limit of an extended metric theory of gravity
with torsion | 10 pages | Eur. Phys. J. Plus (2017) 132: 361 | 10.1140/epjp/i2017-11642-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we construct a relativistic extended metric theory of
gravity, for which its weak field limit reduces to the non-relativistic
MOdified Newtonian Dynamics regime of gravity. The theory is fully covariant
and the way to achieve this is to introduce torsion in the description of
gravity as well as with t... | [
{
"created": "Fri, 23 Dec 2016 13:49:48 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Aug 2017 16:07:02 GMT",
"version": "v2"
}
] | 2017-09-01 | [
[
"Barrientos",
"E.",
""
],
[
"Mendoza",
"S.",
""
]
] | In this article we construct a relativistic extended metric theory of gravity, for which its weak field limit reduces to the non-relativistic MOdified Newtonian Dynamics regime of gravity. The theory is fully covariant and the way to achieve this is to introduce torsion in the description of gravity as well as with the... |
1805.03936 | Hemza Azri | Hemza Azri | Cosmological Implications of Affine Gravity | Ph.D thesis; 109 pages; 18 figures; 3 tables | null | null | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The main aim of this thesis is to reveal some interesting aspects of the
purely affine theory of gravity and its cosmological implication. A particular
attention will be devoted to its consequences when applied to cosmological
inflation. Primarily, affine spacetime, composed of geodesics with no notion of
length and ... | [
{
"created": "Thu, 10 May 2018 12:26:45 GMT",
"version": "v1"
}
] | 2018-05-11 | [
[
"Azri",
"Hemza",
""
]
] | The main aim of this thesis is to reveal some interesting aspects of the purely affine theory of gravity and its cosmological implication. A particular attention will be devoted to its consequences when applied to cosmological inflation. Primarily, affine spacetime, composed of geodesics with no notion of length and an... |
2211.14760 | Masroor C. Pookkillath | Antonio De Felice, Kei-ichi Maeda, Shinji Mukohyama, Masroor C.
Pookkillath | Gravitational collapse and formation of a black hole in a type II
minimally modified gravity theory | 22 pages, 9 figures | null | 10.1088/1475-7516/2023/03/030 | YITP-22-142, IPMU22-0062 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the spherically symmetric collapse of a cloud of dust in VCDM, a
class of gravitational theories with two local physical degrees of freedom. We
find that the collapse corresponds to a particular foliation of the
Oppenheimer-Snyder solution in general relativity (GR) which is endowed with a
constant trace for... | [
{
"created": "Sun, 27 Nov 2022 08:23:40 GMT",
"version": "v1"
}
] | 2023-03-22 | [
[
"De Felice",
"Antonio",
""
],
[
"Maeda",
"Kei-ichi",
""
],
[
"Mukohyama",
"Shinji",
""
],
[
"Pookkillath",
"Masroor C.",
""
]
] | We study the spherically symmetric collapse of a cloud of dust in VCDM, a class of gravitational theories with two local physical degrees of freedom. We find that the collapse corresponds to a particular foliation of the Oppenheimer-Snyder solution in general relativity (GR) which is endowed with a constant trace for t... |
2311.03474 | Giorgio Mentasti | Giorgio Mentasti and Carlo R. Contaldi | Observing gravitational waves with solar system astrometry | 5 pages, 1 figure | null | null | null | gr-qc astro-ph.CO astro-ph.EP astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | The subtle influence of gravitational waves on the apparent positioning of
celestial bodies offers novel observational windows. We calculate the expected
astrometric signal induced by an isotropic Stochastic Gravitational Wave
Background (SGWB) in the short distance limit. Our focus is on the resultant
proper motion ... | [
{
"created": "Mon, 6 Nov 2023 19:23:06 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Feb 2024 19:48:19 GMT",
"version": "v2"
}
] | 2024-02-27 | [
[
"Mentasti",
"Giorgio",
""
],
[
"Contaldi",
"Carlo R.",
""
]
] | The subtle influence of gravitational waves on the apparent positioning of celestial bodies offers novel observational windows. We calculate the expected astrometric signal induced by an isotropic Stochastic Gravitational Wave Background (SGWB) in the short distance limit. Our focus is on the resultant proper motion of... |
2211.13111 | Shao-Jiang Wang | Wang-Wei Yu, Shao-Jiang Wang | Searching for double-peak and doubly broken gravitational-wave spectra
from Advanced LIGO-Virgo's first three observing runs | v1, 5 pages + references, 5 figures, 1 table; v2, 11 pages, 6
figures, 1 table, version accepted for publication in Physical Review D; v3,
to match the published version | Phys. Rev. D 108 (2023) 6, 063526 | 10.1103/PhysRevD.108.063526 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The current LIGO-Virgo observing run has been pushing the sensitivity limit
to touch the stochastic gravitational-wave backgrounds (SGWBs). However, no
significant detection has been reported to date for any single dominated source
of SGWBs with a single broken-power-law (BPL) spectrum. Nevertheless, it could
equally... | [
{
"created": "Wed, 23 Nov 2022 16:51:08 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Sep 2023 17:19:57 GMT",
"version": "v2"
},
{
"created": "Thu, 28 Sep 2023 15:23:34 GMT",
"version": "v3"
}
] | 2023-09-29 | [
[
"Yu",
"Wang-Wei",
""
],
[
"Wang",
"Shao-Jiang",
""
]
] | The current LIGO-Virgo observing run has been pushing the sensitivity limit to touch the stochastic gravitational-wave backgrounds (SGWBs). However, no significant detection has been reported to date for any single dominated source of SGWBs with a single broken-power-law (BPL) spectrum. Nevertheless, it could equally w... |
gr-qc/0412058 | Valery Kiselev | A.A.Logunov, M.A.Mestverishvili, V.V.Kiselev | Black holes: a prediction of theory or phantasy? | Eq.(5) gives the strict inequality for a velocity of massive
particle. It is not correct because the observer on the horizon of black hole
is light-like, hence, the corresponding relative velocity reaches the unit
limit. Second, the trajectory satisfies the Hamilton-Jacobi equation, that
means that the massive ... | Phys.Part.Nucl. 37 (2006) 317-320; Fiz.Elem.Chast.Atom.Yadra 37
(2006) 597-604 | null | null | gr-qc | null | We argue for black holes do not represent a strict consequence of general
relativity.
| [
{
"created": "Mon, 13 Dec 2004 08:59:42 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Dec 2021 15:57:56 GMT",
"version": "v2"
}
] | 2021-12-21 | [
[
"Logunov",
"A. A.",
""
],
[
"Mestverishvili",
"M. A.",
""
],
[
"Kiselev",
"V. V.",
""
]
] | We argue for black holes do not represent a strict consequence of general relativity. |
gr-qc/9307004 | Adam Helfer | Adam D. Helfer | A Phase Space for Gravitational Radiation | 21 pages | Commun.Math.Phys.170:483-502,1995 | 10.1007/BF02099146 | null | gr-qc | null | We give a new definition, based on considerations of well-posedness for a
certain asymptotic initial value problem, of the phase space for the radiative
degrees of freedom of the gravitational field in exact General Relativity. This
space fibres over the space of final states, with the fibres being the purely
radiati... | [
{
"created": "Wed, 7 Jul 1993 23:20:41 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Helfer",
"Adam D.",
""
]
] | We give a new definition, based on considerations of well-posedness for a certain asymptotic initial value problem, of the phase space for the radiative degrees of freedom of the gravitational field in exact General Relativity. This space fibres over the space of final states, with the fibres being the purely radiative... |
1003.4295 | Vitor Cardoso | Mariam Bouhmadi-Lopez, Vitor Cardoso, Andrea Nerozzi, Jorge V. Rocha | Black holes die hard: can one spin-up a black hole past extremality? | 10 pages, 7 figures. RevTex4. | null | 10.1103/PhysRevD.81.084051 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A possible process to destroy a black hole consists on throwing point
particles with sufficiently large angular momentum into the black hole. In the
case of Kerr black holes, it was shown by Wald that particles with dangerously
large angular momentum are simply not captured by the hole, and thus the event
horizon is ... | [
{
"created": "Mon, 22 Mar 2010 22:25:04 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Bouhmadi-Lopez",
"Mariam",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Nerozzi",
"Andrea",
""
],
[
"Rocha",
"Jorge V.",
""
]
] | A possible process to destroy a black hole consists on throwing point particles with sufficiently large angular momentum into the black hole. In the case of Kerr black holes, it was shown by Wald that particles with dangerously large angular momentum are simply not captured by the hole, and thus the event horizon is no... |
0811.3368 | Alexis Larranaga | Alexis Larranaga, Luz Angela Garcia | Thermodynamics of the Three-dimensional Black Hole with a Coulomb-like
Field | 8 pages | EJTP, 9, 27. 121-130 (2012) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the thermodynamical properties of the
(2+1)dimensional black hole with a Coulomb-like electric field and the
differential form of the first law of thermodynamics is derived considering a
virtual displacement of its event horizon. This approach shows that it is
possible to give a thermodynamica... | [
{
"created": "Thu, 20 Nov 2008 17:19:30 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Nov 2008 05:42:40 GMT",
"version": "v2"
}
] | 2012-11-07 | [
[
"Larranaga",
"Alexis",
""
],
[
"Garcia",
"Luz Angela",
""
]
] | In this paper, we study the thermodynamical properties of the (2+1)dimensional black hole with a Coulomb-like electric field and the differential form of the first law of thermodynamics is derived considering a virtual displacement of its event horizon. This approach shows that it is possible to give a thermodynamical ... |
1909.13467 | Pavel Krtous | Pavel Krtou\v{s}, Andrei Zelnikov | Thermodynamics of two black holes | 8 pages, 2 figure; v2: significant modifications; v3: minor typo and
reference corrections | JHEP02(2020)164 | 10.1007/JHEP02(2020)164 | Alberta Thy 11-19 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a system of two charged non-rotating black holes separated by a
strut. Using the exact solution of the Einstein-Maxwell equations, which
describes this system, we construct a consistent form of the first law of
thermodynamics. We derive thermodynamic parameters related to the strut in an
explicit form. The i... | [
{
"created": "Mon, 30 Sep 2019 06:06:22 GMT",
"version": "v1"
},
{
"created": "Thu, 23 Jan 2020 02:19:32 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Feb 2020 16:17:33 GMT",
"version": "v3"
}
] | 2020-02-27 | [
[
"Krtouš",
"Pavel",
""
],
[
"Zelnikov",
"Andrei",
""
]
] | We study a system of two charged non-rotating black holes separated by a strut. Using the exact solution of the Einstein-Maxwell equations, which describes this system, we construct a consistent form of the first law of thermodynamics. We derive thermodynamic parameters related to the strut in an explicit form. The int... |
gr-qc/9705006 | Rafael D. Sorkin | Rafael D. Sorkin (ICN-UNAM and Syracuse University) | The Statistical Mechanics of Black Hole Thermodynamics | 21 pages, plainTeX, no figures. (Only nontrivial change from original
version is rewriting to improve clarity.) | in Black Holes and Relativistic Stars, edited by R.M. Wald
(University of Chicago Press, 1998) | null | null | gr-qc hep-th | null | Although we have convincing evidence that a black hole bears an entropy
proportional to its surface (horizon) area, the ``statistical mechanical''
explanation of this entropy remains unknown. Two basic questions in this
connection are: what is the microscopic origin of the entropy, and why does the
law of entropy inc... | [
{
"created": "Mon, 5 May 1997 15:08:17 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Dec 1997 10:08:58 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Sorkin",
"Rafael D.",
"",
"ICN-UNAM and Syracuse University"
]
] | Although we have convincing evidence that a black hole bears an entropy proportional to its surface (horizon) area, the ``statistical mechanical'' explanation of this entropy remains unknown. Two basic questions in this connection are: what is the microscopic origin of the entropy, and why does the law of entropy incre... |
0908.0219 | Rong-Gen Cai | Zhong-Hua Li, Rong-Gen Cai | Critical Dimension for Stable Self-gravitating Stars in AdS | Revtex, 11 pages with 7 eps figures | Commun.Theor.Phys.52:255-260,2009 | 10.1088/0253-6102/52/2/13 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | We study the self-gravitating stars with a linear equation of state, $P=a
\rho$, in AdS space, where $a$ is a constant parameter. There exists a critical
dimension, beyond which the stars are always stable with any central energy
density; below which there exists a maximal mass configuration for a certain
central ene... | [
{
"created": "Mon, 3 Aug 2009 10:19:56 GMT",
"version": "v1"
}
] | 2010-04-30 | [
[
"Li",
"Zhong-Hua",
""
],
[
"Cai",
"Rong-Gen",
""
]
] | We study the self-gravitating stars with a linear equation of state, $P=a \rho$, in AdS space, where $a$ is a constant parameter. There exists a critical dimension, beyond which the stars are always stable with any central energy density; below which there exists a maximal mass configuration for a certain central energ... |
2301.01329 | Rodrigo Maier | Rodrigo Maier | Stellar Instability from Parametric Resonance | Accepted for publication in Classical and Quantum Gravity | null | 10.1088/1361-6382/acafd3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we examine the stability of stellar configurations in which the
interior solution is described by a closed FLRW geometry sourced with a charged
pressureless fluid and radiation. An interacting vacuum component and a
conformally coupled massive scalar field are also included. Given a simple
factor for th... | [
{
"created": "Tue, 3 Jan 2023 19:31:51 GMT",
"version": "v1"
}
] | 2023-01-25 | [
[
"Maier",
"Rodrigo",
""
]
] | In this paper we examine the stability of stellar configurations in which the interior solution is described by a closed FLRW geometry sourced with a charged pressureless fluid and radiation. An interacting vacuum component and a conformally coupled massive scalar field are also included. Given a simple factor for the ... |
gr-qc/0604057 | Joan Sola | Javier Grande, Joan Sola, Hrvoje Stefancic | LXCDM: a cosmon model solution to the cosmological coincidence problem? | LaTeX, 53 pages, 15 figures. Comments and references added. Version
accepted in JCAP | JCAP0608:011,2006 | 10.1088/1475-7516/2006/08/011 | UB-ECM-PF-06/12 | gr-qc astro-ph hep-ph hep-th | null | We consider the possibility that the total dark energy (DE) of the Universe
is made out of two dynamical components of different nature: a variable
cosmological term, Lambda, and a dynamical ``cosmon'', X, possibly interacting
with Lambda but not with matter -- which remains conserved. We call this
scenario the LXCDM... | [
{
"created": "Tue, 11 Apr 2006 21:40:04 GMT",
"version": "v1"
},
{
"created": "Tue, 2 May 2006 21:19:53 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Aug 2006 16:32:37 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Grande",
"Javier",
""
],
[
"Sola",
"Joan",
""
],
[
"Stefancic",
"Hrvoje",
""
]
] | We consider the possibility that the total dark energy (DE) of the Universe is made out of two dynamical components of different nature: a variable cosmological term, Lambda, and a dynamical ``cosmon'', X, possibly interacting with Lambda but not with matter -- which remains conserved. We call this scenario the LXCDM m... |
1106.0091 | Hossein Farajollahi | H. Farajollahi, A. Salehi | A new approach in stability analysis: case study: tachyon cosmology with
non-minimally coupled scalar field-matter | 21 pages, 30 figures; accepted for publication in Phys. Rev. D | Phys.Rev.D83:124042,2011 | 10.1103/PhysRevD.83.124042 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the general properties of attractors in a cosmological model with
tachyonic potential and a scalar field non-minimally coupled to matter. A
general analytic formulation is given to derive fixed points with a discussion
on their stability. We also check the consistency of the model by fitting it to
the supern... | [
{
"created": "Wed, 1 Jun 2011 04:53:07 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jun 2011 05:46:55 GMT",
"version": "v2"
}
] | 2011-07-08 | [
[
"Farajollahi",
"H.",
""
],
[
"Salehi",
"A.",
""
]
] | We study the general properties of attractors in a cosmological model with tachyonic potential and a scalar field non-minimally coupled to matter. A general analytic formulation is given to derive fixed points with a discussion on their stability. We also check the consistency of the model by fitting it to the supernov... |
gr-qc/0507102 | Bruno Giacomazzo | B. Giacomazzo (1) and L. Rezzolla (1 and 2) ((1) SISSA and INFN, (2)
Louisiana State University) | The Exact Solution of the Riemann Problem in Relativistic MHD | 36 pages, 13 figures. Minor changes to match published version | J. Fluid Mech. 562(2006), 223-259 | 10.1017/S0022112006001145 | null | gr-qc astro-ph | null | We discuss the procedure for the exact solution of the Riemann problem in
special relativistic magnetohydrodynamics (MHD). We consider both initial
states leading to a set of only three waves analogous to the ones in
relativistic hydrodynamics, as well as generic initial states leading to the
full set of seven MHD wa... | [
{
"created": "Mon, 25 Jul 2005 14:52:02 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jul 2006 17:21:28 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Giacomazzo",
"B.",
"",
"1 and 2"
],
[
"Rezzolla",
"L.",
"",
"1 and 2"
]
] | We discuss the procedure for the exact solution of the Riemann problem in special relativistic magnetohydrodynamics (MHD). We consider both initial states leading to a set of only three waves analogous to the ones in relativistic hydrodynamics, as well as generic initial states leading to the full set of seven MHD wave... |
2307.02026 | W{\l}odzimierz Piechocki | A. G\'o\'zd\'z, J. J. Ostrowski, A. P\c{e}drak, W. Piechocki | Quantum system ascribed to the Oppenheimer-Snyder model of massive star | 29 pages, one figure, version accepted for publication in EPJC | null | null | null | gr-qc math-ph math.MP quant-ph | http://creativecommons.org/licenses/by/4.0/ | We quantize the Oppenheimer-Snyder model of black hole using the integral
quantization method. We treat spatial and temporal coordinates on the same
footing both at classical and quantum levels. Our quantization resolves or
smears the singularities of the classical curvature invariants. Quantum
trajectories with boun... | [
{
"created": "Wed, 5 Jul 2023 05:23:56 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Nov 2023 07:17:46 GMT",
"version": "v2"
}
] | 2023-11-30 | [
[
"Góźdź",
"A.",
""
],
[
"Ostrowski",
"J. J.",
""
],
[
"Pȩdrak",
"A.",
""
],
[
"Piechocki",
"W.",
""
]
] | We quantize the Oppenheimer-Snyder model of black hole using the integral quantization method. We treat spatial and temporal coordinates on the same footing both at classical and quantum levels. Our quantization resolves or smears the singularities of the classical curvature invariants. Quantum trajectories with bounce... |
2111.04752 | Isabel Su\'arez Fern\'andez | Isabel Su\'arez Fern\'andez, Thomas W. Baumgarte and David Hilditch | Comparison of linear Brill and Teukolsky waves | 10 pages, 4 figures | null | 10.1103/PhysRevD.104.124036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by studies of critical phenomena in the gravitational collapse of
vacuum gravitational waves we compare, at the linear level, two common
approaches to constructing gravitational-wave initial data. Specifically, we
construct analytical, linear Brill wave initial data and compare these with
Teukolsky waves in... | [
{
"created": "Mon, 8 Nov 2021 19:00:02 GMT",
"version": "v1"
}
] | 2021-12-22 | [
[
"Fernández",
"Isabel Suárez",
""
],
[
"Baumgarte",
"Thomas W.",
""
],
[
"Hilditch",
"David",
""
]
] | Motivated by studies of critical phenomena in the gravitational collapse of vacuum gravitational waves we compare, at the linear level, two common approaches to constructing gravitational-wave initial data. Specifically, we construct analytical, linear Brill wave initial data and compare these with Teukolsky waves in a... |
1903.07098 | Ozay Gurtug | O. Gurtug and M. Mangut | Effect of power-law Maxwell field to the gravitational lensing | 12 pages 5 figures, final version published in Physical Review D | Phys. Rev. D 99, 084003 (2019) | 10.1103/PhysRevD.99.084003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we extend the gravitational bending of light studies in
Kottler metrics to comprise nonlinear electrodynamics within the framework of
Einstein - power - Maxwell theory. We show that the closest approach distance
and the gravitational bending of light are affected from the presence of charge
for particu... | [
{
"created": "Sun, 17 Mar 2019 14:33:59 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Apr 2019 10:20:20 GMT",
"version": "v2"
}
] | 2019-04-11 | [
[
"Gurtug",
"O.",
""
],
[
"Mangut",
"M.",
""
]
] | In this paper, we extend the gravitational bending of light studies in Kottler metrics to comprise nonlinear electrodynamics within the framework of Einstein - power - Maxwell theory. We show that the closest approach distance and the gravitational bending of light are affected from the presence of charge for particula... |
2304.11498 | Alejandro Casallas-Lagos | Alejandro Casallas Lagos, Javier M. Antelis, Claudia Moreno, Michele
Zanolin, Anthony Mezzacappa and Marek J. Szczepa\'nczyk | Characterizing the gravitational wave temporal evolution of the gmode
fundamental resonant frequency for a core collapse supernova: A neural
network approach | 14 pages, 9 figures, 6 tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a methodology based on the implementation of a fully connected
neural network to estimate the gravitational wave (GW) temporal evolution of
the gmode fundamental resonant frequency for a Core Collapse Supernova (CCSN).
To perform the estimation, we construct a training data set, using synthetic
waveforms, ... | [
{
"created": "Sat, 22 Apr 2023 23:18:08 GMT",
"version": "v1"
}
] | 2023-04-25 | [
[
"Lagos",
"Alejandro Casallas",
""
],
[
"Antelis",
"Javier M.",
""
],
[
"Moreno",
"Claudia",
""
],
[
"Zanolin",
"Michele",
""
],
[
"Mezzacappa",
"Anthony",
""
],
[
"Szczepańczyk",
"Marek J.",
""
]
] | We present a methodology based on the implementation of a fully connected neural network to estimate the gravitational wave (GW) temporal evolution of the gmode fundamental resonant frequency for a Core Collapse Supernova (CCSN). To perform the estimation, we construct a training data set, using synthetic waveforms, th... |
1606.06096 | Anuradha Gupta | Sukanta Bose, Sanjeev Dhurandhar, Anuradha Gupta, Andrew Lundgren | Towards mitigating the effect of sine-Gaussian noise transients on
searches for gravitational waves from compact binary coalescences | 18 pages, 13 figures. v2: title changed, minor changes to the text,
matches published version (abstract is shortened to comply with the arXiv's
1920 characters limitation) | Phys. Rev. D 94, 122004 (2016) | 10.1103/PhysRevD.94.122004 | LIGO-P1600145 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave (GW) signals were recently detected directly by LIGO from
the coalescences of two black hole pairs. These detections have strengthened
our belief that compact binary coalescences (CBCs) are the most promising GW
detection prospects accessible to ground-based interferometric detectors. For
detecting... | [
{
"created": "Mon, 20 Jun 2016 12:52:42 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Dec 2016 07:30:38 GMT",
"version": "v2"
}
] | 2016-12-28 | [
[
"Bose",
"Sukanta",
""
],
[
"Dhurandhar",
"Sanjeev",
""
],
[
"Gupta",
"Anuradha",
""
],
[
"Lundgren",
"Andrew",
""
]
] | Gravitational wave (GW) signals were recently detected directly by LIGO from the coalescences of two black hole pairs. These detections have strengthened our belief that compact binary coalescences (CBCs) are the most promising GW detection prospects accessible to ground-based interferometric detectors. For detecting C... |
1706.04434 | Christian Corda Prof. | Y. Heydarzade, H. Hadi, C. Corda and F. Darabi | Braneworld Black Holes and Entropy Bounds | 13 pages, accepted for publication in Physics Letters B | Physics Letters B 776, 457 (2018) | 10.1016/j.physletb.2017.11.061 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Bousso's D-bound entropy for the various possible black hole solutions on
a 4-dimensional brane is checked. It is found that the D-bound entropy here is
apparently different from that of obtained for the 4-dimensional black hole
solutions. This difference is interpreted as the extra loss of information,
associate... | [
{
"created": "Tue, 13 Jun 2017 15:54:19 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Nov 2017 20:28:49 GMT",
"version": "v2"
}
] | 2017-12-25 | [
[
"Heydarzade",
"Y.",
""
],
[
"Hadi",
"H.",
""
],
[
"Corda",
"C.",
""
],
[
"Darabi",
"F.",
""
]
] | The Bousso's D-bound entropy for the various possible black hole solutions on a 4-dimensional brane is checked. It is found that the D-bound entropy here is apparently different from that of obtained for the 4-dimensional black hole solutions. This difference is interpreted as the extra loss of information, associated ... |
2403.10240 | Maria Caruana | Maria Caruana, Gabriel Farrugia, Jackson Levi Said, and Joseph Sultana | Spatial Dependence of the Growth Factor in Scalar-Tensor Cosmology | null | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Scalar-tensor theories have taken on a key role in attempts to confront the
growing open questions in standard cosmology. It is important to understand
entirely their dynamics at perturbative level including any possible spatial
dependence in their growth of large scale structures. In this work, we
investigate the sp... | [
{
"created": "Fri, 15 Mar 2024 12:21:16 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2024 20:35:49 GMT",
"version": "v2"
}
] | 2024-04-04 | [
[
"Caruana",
"Maria",
""
],
[
"Farrugia",
"Gabriel",
""
],
[
"Said",
"Jackson Levi",
""
],
[
"Sultana",
"Joseph",
""
]
] | Scalar-tensor theories have taken on a key role in attempts to confront the growing open questions in standard cosmology. It is important to understand entirely their dynamics at perturbative level including any possible spatial dependence in their growth of large scale structures. In this work, we investigate the spat... |
1203.3563 | Marcello Ortaggio | Sigbj{\o}rn Hervik, Marcello Ortaggio, Lode Wylleman | Minimal tensors and purely electric or magnetic spacetimes of arbitrary
dimension | 43 pages. v2: new proposition 4.10; some text reshuffled (former sec.
2 is now an appendix); references added; some footnotes cancelled, others
incorporated into the main text; some typos fixed and a few more minor
changes made | Class. Quantum Grav. 30 (2013) 165014 | 10.1088/0264-9381/30/16/165014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider time reversal transformations to obtain twofold orthogonal
splittings of any tensor on a Lorentzian space of arbitrary dimension n.
Applied to the Weyl tensor of a spacetime, this leads to a definition of its
electric and magnetic parts relative to an observer (i.e., a unit timelike
vector field u), in an... | [
{
"created": "Thu, 15 Mar 2012 21:04:19 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Dec 2012 21:15:34 GMT",
"version": "v2"
}
] | 2013-07-30 | [
[
"Hervik",
"Sigbjørn",
""
],
[
"Ortaggio",
"Marcello",
""
],
[
"Wylleman",
"Lode",
""
]
] | We consider time reversal transformations to obtain twofold orthogonal splittings of any tensor on a Lorentzian space of arbitrary dimension n. Applied to the Weyl tensor of a spacetime, this leads to a definition of its electric and magnetic parts relative to an observer (i.e., a unit timelike vector field u), in any ... |
2008.13350 | Ryotaro Kase | Ryotaro Kase, Shinji Tsujikawa | Instability of compact stars with a nonminimal scalar-derivative
coupling | 17 pages, 8 figures, published version | JCAP01(2021)008 | 10.1088/1475-7516/2021/01/008 | WUCG-20-06 | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a theory in which a scalar field $\phi$ has a nonminimal derivative
coupling to the Einstein tensor $G_{\mu \nu}$ of the form $\phi\,G_{\mu
\nu}\nabla^{\mu}\nabla^{\nu} \phi$, it is known that there exists a branch of
static and spherically-symmetric relativistic stars endowed with a scalar hair
in their interior... | [
{
"created": "Mon, 31 Aug 2020 04:10:06 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Sep 2020 08:51:32 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Jan 2021 01:05:03 GMT",
"version": "v3"
}
] | 2021-01-08 | [
[
"Kase",
"Ryotaro",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | For a theory in which a scalar field $\phi$ has a nonminimal derivative coupling to the Einstein tensor $G_{\mu \nu}$ of the form $\phi\,G_{\mu \nu}\nabla^{\mu}\nabla^{\nu} \phi$, it is known that there exists a branch of static and spherically-symmetric relativistic stars endowed with a scalar hair in their interiors.... |
0712.3643 | Shih-Yuin Lin | B. L. Hu and Shih-Yuin Lin | Black Hole Information in a Detector (Atom) - Field Analog | 13 pages, 4 figures; Invited plenary talk at the workshop ``From
Quantum to Emergent Gravity: Theory and Phenomenology", Trieste, Italy, June
11-15, 2007 | PoS QG-Ph:019,2007 | null | null | gr-qc | null | This is a synopsis of our recent work on quantum entanglement, recoherence
and information flow between an uniformly accelerated detector and a massless
quantum scalar field. The availability of exact solutions to this model enables
us to explore the black hole information issue with some quantifiable results
and new... | [
{
"created": "Fri, 21 Dec 2007 09:09:46 GMT",
"version": "v1"
}
] | 2009-12-15 | [
[
"Hu",
"B. L.",
""
],
[
"Lin",
"Shih-Yuin",
""
]
] | This is a synopsis of our recent work on quantum entanglement, recoherence and information flow between an uniformly accelerated detector and a massless quantum scalar field. The availability of exact solutions to this model enables us to explore the black hole information issue with some quantifiable results and new i... |
1808.07246 | Abolhassan Mohammadi | Abolhassan Mohammadi, Tayeb Golanbari, and Khaled Saaidi | Observational constraints on DBI constant-roll inflation | 32 pages, 9 figures | Physics of the Dark Universe 27, 100456 (2020) | 10.1016/j.dark.2019.100456 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the constant-roll approach, DBI inflationary scenario will be studied
and it is sought to compare the result with observational data. By considering
the cosmological perturbations of the model, it is realized that some extra
terms appear in the amplitude of scalar perturbations which indicate that there
shuold ... | [
{
"created": "Wed, 22 Aug 2018 07:04:22 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Nov 2019 17:45:48 GMT",
"version": "v2"
}
] | 2020-05-12 | [
[
"Mohammadi",
"Abolhassan",
""
],
[
"Golanbari",
"Tayeb",
""
],
[
"Saaidi",
"Khaled",
""
]
] | Using the constant-roll approach, DBI inflationary scenario will be studied and it is sought to compare the result with observational data. By considering the cosmological perturbations of the model, it is realized that some extra terms appear in the amplitude of scalar perturbations which indicate that there shuold be... |
1506.02631 | Vuk Mandic | K. Crocker, V. Mandic, T. Regimbau, K. Belczynski, W. Gladysz, K.
Olive, T. Prestegard, E. Vangioni | A Model of the Stochastic Gravitational-Wave Background due to Core
Collapse to Black Holes | null | Phys. Rev. D 92, 063005 (2015) | 10.1103/PhysRevD.92.063005 | FTPI-MINN-15/28, UMN-TH-3440/15, LIGO-P1500077 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superposition of gravitational waves generated by astrophysical sources is
expected to give rise to the stochastic gravitational-wave background. We focus
on the background generated by the ring-down of black holes produced in the
stellar core collapse events across the universe. We systematically study the
parameter... | [
{
"created": "Mon, 8 Jun 2015 19:36:04 GMT",
"version": "v1"
}
] | 2015-09-16 | [
[
"Crocker",
"K.",
""
],
[
"Mandic",
"V.",
""
],
[
"Regimbau",
"T.",
""
],
[
"Belczynski",
"K.",
""
],
[
"Gladysz",
"W.",
""
],
[
"Olive",
"K.",
""
],
[
"Prestegard",
"T.",
""
],
[
"Vangioni",
"E.... | Superposition of gravitational waves generated by astrophysical sources is expected to give rise to the stochastic gravitational-wave background. We focus on the background generated by the ring-down of black holes produced in the stellar core collapse events across the universe. We systematically study the parameter s... |
2309.01709 | Hao-Jui Kuan | Hao-Jui Kuan, Karim Van Aelst, Alan Tsz-Lok Lam, Masaru Shibata | Binary neutron star mergers in massive scalar-tensor theory:
Quasi-equilibrium states and dynamical enhancement of the scalarization | 14 pages, 8 figures, 1 table. Submitted to PRD | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study quasi-equilibrium sequences of binary neutron stars in the framework
of Damour-Esposito-Farese-type scalar-tensor theory of gravity with a massive
scalar field, paying particular attention to the case where neutron stars are
already spontaneously scalarized at distant orbits, i.e., in the high coupling
const... | [
{
"created": "Mon, 4 Sep 2023 16:42:23 GMT",
"version": "v1"
}
] | 2023-09-06 | [
[
"Kuan",
"Hao-Jui",
""
],
[
"Van Aelst",
"Karim",
""
],
[
"Lam",
"Alan Tsz-Lok",
""
],
[
"Shibata",
"Masaru",
""
]
] | We study quasi-equilibrium sequences of binary neutron stars in the framework of Damour-Esposito-Farese-type scalar-tensor theory of gravity with a massive scalar field, paying particular attention to the case where neutron stars are already spontaneously scalarized at distant orbits, i.e., in the high coupling constan... |
2306.05210 | Felipe Asenjo | Felipe A. Asenjo and Sergio A. Hojman | Time-domain supersymmetry for massless scalar and electromagnetic fields
in anisotropic cosmologies | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that any cosmological anisotropic model produces supersymmetric
theories for both massless scalar and electromagnetic fields. This
supersymmetric theory is the time-domain analogue of a supersymmetric quantum
mechanical theory. In this case, the variations of the anisotropic scale
factors of the Universe ... | [
{
"created": "Thu, 8 Jun 2023 14:09:27 GMT",
"version": "v1"
}
] | 2023-06-09 | [
[
"Asenjo",
"Felipe A.",
""
],
[
"Hojman",
"Sergio A.",
""
]
] | It is shown that any cosmological anisotropic model produces supersymmetric theories for both massless scalar and electromagnetic fields. This supersymmetric theory is the time-domain analogue of a supersymmetric quantum mechanical theory. In this case, the variations of the anisotropic scale factors of the Universe ar... |
1106.3877 | Sujoy Modak Dr. | Rabin Banerjee, Sujoy Kumar Modak, Dibakar Roychowdhury | A unified picture of phase transition: from liquid-vapour systems to AdS
black holes | v3; JHEP style, 11 pages, 1 figure; title is changed, paper rewritten
but basic results are unchanged, to appear in JHEP | JHEP 1210:125,2012 | 10.1007/JHEP10(2012)125 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on fundamental concepts of thermodynamics we examine phase transitions
in black holes defined in Anti-de Sitter (AdS) spaces. The method is in line
with that used a long ago to understand the liquid-vapour phase transition
where the first order derivatives of Gibbs potential are discontinuous and
Clausius-Clape... | [
{
"created": "Mon, 20 Jun 2011 12:17:48 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jul 2011 12:14:43 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Sep 2012 07:13:08 GMT",
"version": "v3"
}
] | 2012-10-23 | [
[
"Banerjee",
"Rabin",
""
],
[
"Modak",
"Sujoy Kumar",
""
],
[
"Roychowdhury",
"Dibakar",
""
]
] | Based on fundamental concepts of thermodynamics we examine phase transitions in black holes defined in Anti-de Sitter (AdS) spaces. The method is in line with that used a long ago to understand the liquid-vapour phase transition where the first order derivatives of Gibbs potential are discontinuous and Clausius-Clapeyr... |
gr-qc/0307082 | Eric Gourgoulhon | S. Bonazzola, E. Gourgoulhon, P. Grandclement, J. Novak (LUTH, CNRS,
Observatoire de Paris) | A constrained scheme for Einstein equations based on Dirac gauge and
spherical coordinates | Difference w.r.t. v1: Major revision: improved presentation of the
tensor wave equation and addition of the first results from a numerical
implementation; w.r.t. v2: Minor changes: improved conclusion and figures;
w.r.t. v3: Minors changes, 1 figure added; 25 pages, 13 figures, REVTeX,
accepted for publication ... | Phys.Rev. D70 (2004) 104007 | 10.1103/PhysRevD.70.104007 | null | gr-qc | null | We propose a new formulation for 3+1 numerical relativity, based on a
constrained scheme and a generalization of Dirac gauge to spherical
coordinates. This is made possible thanks to the introduction of a flat
3-metric on the spatial hypersurfaces t=const, which corresponds to the
asymptotic structure of the physical... | [
{
"created": "Thu, 17 Jul 2003 13:01:14 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jul 2004 21:24:45 GMT",
"version": "v2"
},
{
"created": "Sat, 31 Jul 2004 20:49:38 GMT",
"version": "v3"
},
{
"created": "Tue, 21 Sep 2004 09:45:58 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Bonazzola",
"S.",
"",
"LUTH, CNRS,\n Observatoire de Paris"
],
[
"Gourgoulhon",
"E.",
"",
"LUTH, CNRS,\n Observatoire de Paris"
],
[
"Grandclement",
"P.",
"",
"LUTH, CNRS,\n Observatoire de Paris"
],
[
"Novak",
"J.",
"",
"LUTH, CNRS,\... | We propose a new formulation for 3+1 numerical relativity, based on a constrained scheme and a generalization of Dirac gauge to spherical coordinates. This is made possible thanks to the introduction of a flat 3-metric on the spatial hypersurfaces t=const, which corresponds to the asymptotic structure of the physical 3... |
gr-qc/0301090 | S. Shankaranarayanan | S. Shankaranarayanan | Temperature and entropy of Schwarzschild-de Sitter space-time | Final version; To appear in Phys. Rev. D; 12 pages, 1 figure,
RevTex-4; Typos corrected; References added | Phys.Rev. D67 (2003) 084026 | 10.1103/PhysRevD.67.084026 | null | gr-qc hep-th | null | In the light of recent interest in quantum gravity in de Sitter space, we
investigate semi-classical aspects of 4-dimensional Schwarzschild-de Sitter
space-time using the method of complex paths. The standard semi-classical
techniques (such as Bogoliubov coefficients and Euclidean field theory) have
been useful to st... | [
{
"created": "Wed, 22 Jan 2003 18:56:15 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Apr 2003 12:50:19 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Shankaranarayanan",
"S.",
""
]
] | In the light of recent interest in quantum gravity in de Sitter space, we investigate semi-classical aspects of 4-dimensional Schwarzschild-de Sitter space-time using the method of complex paths. The standard semi-classical techniques (such as Bogoliubov coefficients and Euclidean field theory) have been useful to stud... |
2104.03253 | Aron Wall | Aron C. Wall | Violation of Unitarity in Gravitational Subregions | 8 pages, 3 figs. Submitted to the Gravity Research Foundation 2021
Essay Competition | Int. J. Mod. Phys. D 30, 2142014 (2021) | 10.1142/S0218271821420141 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This essay contends that in quantum gravity, some spatial regions do not
admit a unitary Hilbert space. Because the gravitational path integral
spontaneously breaks CPT symmetry, "states" with negative probability can be
identified on either side of trapped surfaces. I argue that these negative norm
states are tolera... | [
{
"created": "Wed, 7 Apr 2021 16:56:39 GMT",
"version": "v1"
}
] | 2022-07-04 | [
[
"Wall",
"Aron C.",
""
]
] | This essay contends that in quantum gravity, some spatial regions do not admit a unitary Hilbert space. Because the gravitational path integral spontaneously breaks CPT symmetry, "states" with negative probability can be identified on either side of trapped surfaces. I argue that these negative norm states are tolerabl... |
2210.01184 | Albert Munyeshyaka Mr | Albert Munyeshyaka, Joseph Ntahompagaze, Tom Mutabazi, Manasse.R
Mbonye, Abraham Ayirwanda, Fidele Twagirayezu and Amare Abebe | Perturbations in the interacting vacuum | 28 pages, 13 figures | Int. J. Mod. Phys. D 32 12 (2023) | 10.1142/S0219887823500470 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this study, we present the evolution of cosmological perturbations in a
universe consisting of standard matter and interacting vacuum. We use the $1 +
3$ covariant formalism in perturbation framework and consider two different
models for the interacting vacuum namely a linear interacting model and
interaction with... | [
{
"created": "Mon, 3 Oct 2022 18:54:50 GMT",
"version": "v1"
}
] | 2024-01-15 | [
[
"Munyeshyaka",
"Albert",
""
],
[
"Ntahompagaze",
"Joseph",
""
],
[
"Mutabazi",
"Tom",
""
],
[
"Mbonye",
"Manasse. R",
""
],
[
"Ayirwanda",
"Abraham",
""
],
[
"Twagirayezu",
"Fidele",
""
],
[
"Abebe",
"Amare",
... | In this study, we present the evolution of cosmological perturbations in a universe consisting of standard matter and interacting vacuum. We use the $1 + 3$ covariant formalism in perturbation framework and consider two different models for the interacting vacuum namely a linear interacting model and interaction with c... |
1001.2287 | Valerio Faraoni | Valerio Faraoni (Bishop's University) | The Jebsen-Birkhoff theorem in alternative gravity | 10 pages, no figures, to appear in Phys. Rev. D | Phys.Rev.D81:044002,2010 | 10.1103/PhysRevD.81.044002 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the validity, or lack thereof, of the Jebsen-Birkhoff theorem in
scalar-tensor theories by generalizing it and regarding the Brans-Dicke-like
scalar as effective matter. Both the Jordan and Einstein frames are discussed
and an apparent contradiction between static spherical solutions of
scalar-tensor gravi... | [
{
"created": "Wed, 13 Jan 2010 20:03:07 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
]
] | We discuss the validity, or lack thereof, of the Jebsen-Birkhoff theorem in scalar-tensor theories by generalizing it and regarding the Brans-Dicke-like scalar as effective matter. Both the Jordan and Einstein frames are discussed and an apparent contradiction between static spherical solutions of scalar-tensor gravity... |
0811.4076 | Betti Hartmann | Betti Hartmann (Jacobs University Bremen, Germany) | Non-abelian black holes and black strings in higher dimensions | 8 pages; prepared as contribution to the proceedings of the Spanish
Relativity Meeting (ERE), Salamanca, 2008 | AIP Conf.Proc.1122:137-144,2009 | 10.1063/1.3141235 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review the properties of static, higher dimensional black hole solutions
in theories where non-abelian gauge fields are minimally coupled to gravity. It
is shown that black holes with hyperspherically symmetric horizon topology do
not exist in $d > 4$, but that hyperspherically symmetric black holes can be
constru... | [
{
"created": "Tue, 25 Nov 2008 12:54:39 GMT",
"version": "v1"
}
] | 2009-07-24 | [
[
"Hartmann",
"Betti",
"",
"Jacobs University Bremen, Germany"
]
] | We review the properties of static, higher dimensional black hole solutions in theories where non-abelian gauge fields are minimally coupled to gravity. It is shown that black holes with hyperspherically symmetric horizon topology do not exist in $d > 4$, but that hyperspherically symmetric black holes can be construct... |
gr-qc/9706008 | Serge Massar | S. Massar and R. Parentani | Particle creation and non-adiabatic transitions in quantum cosmology | 27 pages, Latex | Nucl.Phys. B513 (1998) 375-401 | 10.1016/S0550-3213(97)00718-9 | TAUP 2429-97 | gr-qc | null | The aim of this paper is to compute transitions amplitudes in quantum
cosmology, and in particular pair creation amplitudes and radiative
transitions. To this end, we apply a double adiabatic development to the
solutions of the Wheeler-DeWitt equation restricted to mini-superspace wherein
gravity is described by the ... | [
{
"created": "Tue, 3 Jun 1997 12:40:39 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Massar",
"S.",
""
],
[
"Parentani",
"R.",
""
]
] | The aim of this paper is to compute transitions amplitudes in quantum cosmology, and in particular pair creation amplitudes and radiative transitions. To this end, we apply a double adiabatic development to the solutions of the Wheeler-DeWitt equation restricted to mini-superspace wherein gravity is described by the sc... |
1002.1818 | J\"org Hennig | J\"org Hennig and Gernot Neugebauer | Non-existence of stationary two-black-hole configurations | Proceedings of the 12th Marcel Grossmann Meeting (Paris, July 12-18,
2009), 3 pages | null | null | AEI-2010-021 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We resume former discussions of the question, whether the spin-spin repulsion
and the gravitational attraction of two aligned sub-extremal black holes can
balance each other. To answer the question we formulate a boundary value
problem for two separate (Killing-) horizons and apply the inverse (scattering)
method to ... | [
{
"created": "Tue, 9 Feb 2010 10:48:37 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jun 2010 13:23:51 GMT",
"version": "v2"
}
] | 2010-06-08 | [
[
"Hennig",
"Jörg",
""
],
[
"Neugebauer",
"Gernot",
""
]
] | We resume former discussions of the question, whether the spin-spin repulsion and the gravitational attraction of two aligned sub-extremal black holes can balance each other. To answer the question we formulate a boundary value problem for two separate (Killing-) horizons and apply the inverse (scattering) method to so... |
1206.5658 | Martin Kolo\v{s} | Z. Stuchl\'ik and M. Kolo\v{s} | Acceleration of string loops in the Schwarzschild-de Sitter geometry | 12 pages, 7 figures | Physical Review D, vol. 85, Issue 6, id. 065022, 2012 | 10.1103/PhysRevD.85.065022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study acceleration of current-carrying string loops governed by the
presence of an outer tension barrier and an inner angular momentum barrier in
the field of Schwarzschild-de Sitter black holes. We restrict attention to the
axisymmetric motion of string loops with energy high enough, when the string
loop can over... | [
{
"created": "Mon, 25 Jun 2012 12:04:38 GMT",
"version": "v1"
}
] | 2012-06-26 | [
[
"Stuchlík",
"Z.",
""
],
[
"Kološ",
"M.",
""
]
] | We study acceleration of current-carrying string loops governed by the presence of an outer tension barrier and an inner angular momentum barrier in the field of Schwarzschild-de Sitter black holes. We restrict attention to the axisymmetric motion of string loops with energy high enough, when the string loop can overco... |
1005.3250 | Jong-Ping Hsu | Jong-Ping Hsu | Yang-Mills Gravity in Flat Space-time, II. Gravitational Radiations and
Lee-Yang Force for Accelerated Cosmic Expansion | 19 pages | Int.J.Mod.Phys.A24:5217-5233,2009 | 10.1142/S0217751X0904765X | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within Yang-Mills gravity with translation group $T(4)$ in flat space-time,
the invariant action involving quadratic translation gauge-curvature leads to
quadrupole radiations which are shown to be consistent with experiments. The
radiation power turns out to be the same as that in Einstein's gravity to the
second-or... | [
{
"created": "Tue, 18 May 2010 17:00:45 GMT",
"version": "v1"
}
] | 2010-05-25 | [
[
"Hsu",
"Jong-Ping",
""
]
] | Within Yang-Mills gravity with translation group $T(4)$ in flat space-time, the invariant action involving quadratic translation gauge-curvature leads to quadrupole radiations which are shown to be consistent with experiments. The radiation power turns out to be the same as that in Einstein's gravity to the second-orde... |
1306.6724 | Dario Bettoni | Dario Bettoni, Stefano Liberati | Disformal invariance of second order tensor-scalar theories: framing the
Horndeski action | 17 pages, one table, more references, typos corrected | Phys. Rev. D 88, 084020 (2013) | 10.1103/PhysRevD.88.084020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Horndeski action is the most general one involving a metric and a scalar
field that leads to second order field equations in four dimensions. Being the
natural extension of the well known Scalar-Tensor theories, its structure and
properties are worth analysing along the experience accumulated in the latter
contex... | [
{
"created": "Fri, 28 Jun 2013 06:20:03 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Oct 2013 10:37:11 GMT",
"version": "v2"
}
] | 2013-10-22 | [
[
"Bettoni",
"Dario",
""
],
[
"Liberati",
"Stefano",
""
]
] | The Horndeski action is the most general one involving a metric and a scalar field that leads to second order field equations in four dimensions. Being the natural extension of the well known Scalar-Tensor theories, its structure and properties are worth analysing along the experience accumulated in the latter context.... |
1801.02118 | Chen Songbai | Mingzhi Wang, Songbai Chen, Jiliang Jing | Chaotic shadow of a non-Kerr rotating compact object with quadrupole
mass moment | 23 pages, 12 figures, Accepted by PRD for publication | Phys. Rev. D 98, 104040 (2018) | 10.1103/PhysRevD.98.104040 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied numerically the shadows of a non-Kerr rotating compact object
with quadrupole mass moment, which belongs to Manko-Novikov family. The
non-integrable photon motion caused by quadrupole mass moment affects sharply
the shadow of the compact object. As the deviation parameter related to
quadrupole mass mo... | [
{
"created": "Sun, 7 Jan 2018 03:15:51 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2018 03:24:15 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Nov 2018 09:19:42 GMT",
"version": "v3"
}
] | 2018-11-29 | [
[
"Wang",
"Mingzhi",
""
],
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | We have studied numerically the shadows of a non-Kerr rotating compact object with quadrupole mass moment, which belongs to Manko-Novikov family. The non-integrable photon motion caused by quadrupole mass moment affects sharply the shadow of the compact object. As the deviation parameter related to quadrupole mass mome... |
gr-qc/9708064 | Ronggen Cai | Rong-Gen Cai, Jeong-Young Ji | Hairs on the cosmological horizon | Revtex, no figures, 16 pages | Phys.Rev. D58 (1998) 024002 | 10.1103/PhysRevD.58.024002 | SNUTP 97-120 | gr-qc | null | We investigate the possibility of having hairs on the cosmological horizon.
The cosmological horizon shares similar properties of black hole horizons in
the aspect of having hairs on the horizons. For those theories admitting haired
black hole solutions, the nontrivial matter fields may reach and extend beyond
the co... | [
{
"created": "Tue, 26 Aug 1997 12:47:18 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Sep 1997 00:41:36 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Jul 1998 08:14:30 GMT",
"version": "v3"
}
] | 2009-10-30 | [
[
"Cai",
"Rong-Gen",
""
],
[
"Ji",
"Jeong-Young",
""
]
] | We investigate the possibility of having hairs on the cosmological horizon. The cosmological horizon shares similar properties of black hole horizons in the aspect of having hairs on the horizons. For those theories admitting haired black hole solutions, the nontrivial matter fields may reach and extend beyond the cosm... |
1209.2144 | Naresh Dadhich | Naresh Dadhich | A curious spacetime entirely free of centrifugal acceleration | 3 pages, latex | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the Einstein gravity, besides the usual gravitational and centrifugal
potential there is an additional attractive term that couples these two
together. It is fun to enquire whether the latter could fully counteract the
centrifugal repulsion everywhere making the spacetime completely free of the
centrifugal acceler... | [
{
"created": "Fri, 7 Sep 2012 09:30:31 GMT",
"version": "v1"
}
] | 2012-09-12 | [
[
"Dadhich",
"Naresh",
""
]
] | In the Einstein gravity, besides the usual gravitational and centrifugal potential there is an additional attractive term that couples these two together. It is fun to enquire whether the latter could fully counteract the centrifugal repulsion everywhere making the spacetime completely free of the centrifugal accelerat... |
1711.02898 | Balendra Pratap Singh | Balendra Pratap Singh | Rotating charged black holes shadow in quintessence | 15 pages, 7 figures | Annals of Physics, 168892 (2022) | 10.1016/j.aop.2022.168892 | Report-no:YAPHY_168892 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the shadow of rotating charge black holes in the presence of
quintessence. The shadow of a rotating black hole is a distorted circle and in
our study, we find that the shape and size of the black hole shadow depend upon
four parameters, i.e., charge $q$, spin parameter $a$, quintessential field
parameter $\o... | [
{
"created": "Wed, 8 Nov 2017 10:31:04 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2022 09:29:36 GMT",
"version": "v2"
}
] | 2022-05-05 | [
[
"Singh",
"Balendra Pratap",
""
]
] | We study the shadow of rotating charge black holes in the presence of quintessence. The shadow of a rotating black hole is a distorted circle and in our study, we find that the shape and size of the black hole shadow depend upon four parameters, i.e., charge $q$, spin parameter $a$, quintessential field parameter $\ome... |
gr-qc/0703133 | Mikhail Iofa | Mikhail Z. Iofa | A note on cosmology in a brane model | 10 pages LaTex | null | null | null | gr-qc astro-ph | null | We study some aspects of cosmology in a five-dimensional model with matter,
radiation and cosmological constant on the four-dimensional brane(s) and
without matter in the bulk. The action of the model does not contain explicit
curvature terms on the the brane(s). We obtain solution of the generalized
Friedman equatio... | [
{
"created": "Tue, 27 Mar 2007 14:36:31 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Iofa",
"Mikhail Z.",
""
]
] | We study some aspects of cosmology in a five-dimensional model with matter, radiation and cosmological constant on the four-dimensional brane(s) and without matter in the bulk. The action of the model does not contain explicit curvature terms on the the brane(s). We obtain solution of the generalized Friedman equation ... |
1711.00996 | Changjun Gao | Changjun Gao, Youjun Lu, Shuang Yu, You-Gen Shen | Black hole and cosmos with multiple horizons and multiple singularities
in vector-tensor theories | 14 pages, 7 figures. The Penrose diagrams are corrected. PRD accepted | Phys. Rev. D 97, 104013 (2018) | 10.1103/PhysRevD.97.104013 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A stationary and spherically symmetric black hole (For example,
Reissner-Nordstrom black hole or Kerr-Newman black hole) has at most one
singularity and two horizons. One horizon is the outer event horizon and the
other is the inner Cauchy horizon. Can we construct static and spherically
symmetric black hole solution... | [
{
"created": "Fri, 3 Nov 2017 02:14:19 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 2017 05:03:36 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Nov 2017 03:06:08 GMT",
"version": "v3"
},
{
"created": "Mon, 13 Nov 2017 00:24:12 GMT",
"version": "v4"
},
{
"crea... | 2018-05-23 | [
[
"Gao",
"Changjun",
""
],
[
"Lu",
"Youjun",
""
],
[
"Yu",
"Shuang",
""
],
[
"Shen",
"You-Gen",
""
]
] | A stationary and spherically symmetric black hole (For example, Reissner-Nordstrom black hole or Kerr-Newman black hole) has at most one singularity and two horizons. One horizon is the outer event horizon and the other is the inner Cauchy horizon. Can we construct static and spherically symmetric black hole solutions ... |
0911.4232 | Yousuke Itoh | Yousuke Itoh | Third-and-a-half order post-Newtonian equations of motion for
relativistic compact binaries using the strong field point particle limit | 38 pages, no figures. Accepted for publication in Phys. Rev. D | Phys.Rev.D80:124003,2009 | 10.1103/PhysRevD.80.124003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report our rederivation of the equations of motion for relativistic
compact binaries through the third-and-a-half post-Newtonian (3.5 PN) order
approximation to general relativity using the strong field point particle limit
to describe self-gravitating stars instead of the Dirac delta functional. The
computation i... | [
{
"created": "Sun, 22 Nov 2009 06:03:07 GMT",
"version": "v1"
}
] | 2010-10-12 | [
[
"Itoh",
"Yousuke",
""
]
] | We report our rederivation of the equations of motion for relativistic compact binaries through the third-and-a-half post-Newtonian (3.5 PN) order approximation to general relativity using the strong field point particle limit to describe self-gravitating stars instead of the Dirac delta functional. The computation is ... |
gr-qc/9712086 | Jutta Kunz | Burkhard Kleihaus and Jutta Kunz (Universit\"at Oldenburg) | Static Axially Symmetric Einstein-Yang-Mills-Dilaton Solutions: II.Black
Hole Solutions | 41 pages including 45 postscript figures, RevTex format | Phys.Rev. D57 (1998) 6138-6157 | 10.1103/PhysRevD.57.6138 | null | gr-qc hep-th | null | We discuss the new class of static axially symmetric black hole solutions
obtained recently in Einstein-Yang-Mills and Einstein-Yang-Mills-dilaton
theory. These black hole solutions are asymptotically flat and they possess a
regular event horizon. The event horizon is almost spherically symmetric with a
slight elonga... | [
{
"created": "Mon, 22 Dec 1997 16:49:28 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Kleihaus",
"Burkhard",
"",
"Universität Oldenburg"
],
[
"Kunz",
"Jutta",
"",
"Universität Oldenburg"
]
] | We discuss the new class of static axially symmetric black hole solutions obtained recently in Einstein-Yang-Mills and Einstein-Yang-Mills-dilaton theory. These black hole solutions are asymptotically flat and they possess a regular event horizon. The event horizon is almost spherically symmetric with a slight elongati... |
2004.03641 | David Brown | J. David Brown | Elasticity Theory in General Relativity | 12 pages, 2 figures, to be published in Classical and Quantum Gravity | null | 10.1088/1361-6382/abe1ff | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The general relativistic theory of elasticity is reviewed from a Lagrangian,
as opposed to Eulerian, perspective. The equations of motion and
stress-energy-momentum tensor for a hyperelastic body are derived from the
gauge-invariant action principle first considered by DeWitt. This action is a
natural extension of th... | [
{
"created": "Tue, 7 Apr 2020 18:26:40 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Feb 2021 20:13:53 GMT",
"version": "v2"
}
] | 2021-06-09 | [
[
"Brown",
"J. David",
""
]
] | The general relativistic theory of elasticity is reviewed from a Lagrangian, as opposed to Eulerian, perspective. The equations of motion and stress-energy-momentum tensor for a hyperelastic body are derived from the gauge-invariant action principle first considered by DeWitt. This action is a natural extension of the ... |
1405.2133 | Dimitry Ayzenberg | Dimitry Ayzenberg and Nicolas Yunes | Slowly-Rotating Black Holes in Einstein-Dilaton-Gauss-Bonnet Gravity:
Quadratic Order in Spin Solutions | 13 pages, 1 figure. Updated to published version. Typos fixed | Phys. Rev. D 90, 044066 (2014) | 10.1103/PhysRevD.90.044066 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a stationary and axisymmetric black hole solution in
Einstein-Dilaton-Gauss-Bonnet gravity to quadratic order in the ratio of the
spin angular momentum to the black hole mass squared. This solution introduces
new corrections to previously found nonspinning and linear-in-spin solutions.
The location of the e... | [
{
"created": "Fri, 9 May 2014 02:39:49 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Aug 2014 17:13:21 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Feb 2015 23:18:37 GMT",
"version": "v3"
},
{
"created": "Mon, 23 Feb 2015 05:20:15 GMT",
"version": "v4"
}
] | 2015-02-24 | [
[
"Ayzenberg",
"Dimitry",
""
],
[
"Yunes",
"Nicolas",
""
]
] | We derive a stationary and axisymmetric black hole solution in Einstein-Dilaton-Gauss-Bonnet gravity to quadratic order in the ratio of the spin angular momentum to the black hole mass squared. This solution introduces new corrections to previously found nonspinning and linear-in-spin solutions. The location of the eve... |
1311.5261 | Diego S\'aez-G\'omez | Ratbay Myrzakulov, Diego Saez-Gomez and Petr Tsyba | Cosmological solutions in F(T) gravity with the presence of spinor
fields | 10 pages | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The presence of spinor fields is considered in the framework of some
extensions of teleparallel gravity, where the Weitzenb\"ock connection is
assumed. Some well known models as the Chaplygin gas and its generalizations
are reconstructed in terms of a spinor field in the framework of teleparallel
gravity. In addition... | [
{
"created": "Wed, 20 Nov 2013 23:05:40 GMT",
"version": "v1"
}
] | 2013-11-22 | [
[
"Myrzakulov",
"Ratbay",
""
],
[
"Saez-Gomez",
"Diego",
""
],
[
"Tsyba",
"Petr",
""
]
] | The presence of spinor fields is considered in the framework of some extensions of teleparallel gravity, where the Weitzenb\"ock connection is assumed. Some well known models as the Chaplygin gas and its generalizations are reconstructed in terms of a spinor field in the framework of teleparallel gravity. In addition, ... |
gr-qc/9302032 | null | J. W. Moffat | Do Black Holes Exist? | 10 pages, UTPT-93-04 | null | null | null | gr-qc | null | The problem of information loss in black hole formation and the associated
violations of basic laws of physics, such as conservation of energy, causality
and unitarity, are avoided in the nonsymmetric gravitational theory, if the NGT
charge of a black hole and its mass satisfy an inequality that does not violate
any ... | [
{
"created": "Mon, 22 Feb 1993 23:28:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Moffat",
"J. W.",
""
]
] | The problem of information loss in black hole formation and the associated violations of basic laws of physics, such as conservation of energy, causality and unitarity, are avoided in the nonsymmetric gravitational theory, if the NGT charge of a black hole and its mass satisfy an inequality that does not violate any kn... |
1509.03895 | Chien-Hao Liu | Chien-Hao Liu | Quantum fluctuations, conformal deformations, and Gromov's topology ---
Wheeler, DeWitt, and Wilson meeting Gromov | 23+2 pages, 8 figures. Two brief notes after the first posting are
added on p.23: One on a historical account linking to the related work of
David Edwards in 1968; and the other on the proof of the Main Theorem and an
inflation scenario in cosmology | null | null | null | gr-qc hep-th math.DG math.GT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The moduli space of isometry classes of Riemannian structures on a smooth
manifold was emphasized by J.A.Wheeler in his superspace formalism of quantum
gravity. A natural question concerning it is: What is a natural topology on
such moduli space that reflects best quantum fluctuations of the geometries
within the Pla... | [
{
"created": "Sun, 13 Sep 2015 20:33:01 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Oct 2015 00:29:27 GMT",
"version": "v2"
}
] | 2015-10-08 | [
[
"Liu",
"Chien-Hao",
""
]
] | The moduli space of isometry classes of Riemannian structures on a smooth manifold was emphasized by J.A.Wheeler in his superspace formalism of quantum gravity. A natural question concerning it is: What is a natural topology on such moduli space that reflects best quantum fluctuations of the geometries within the Planc... |
1601.06864 | E M Howard Dr. | E. M. Howard | Causal structure of general relativistic spacetimes | 4 pages, 1 figure, Conference, 24/26 November 2009, Perth, WA | AIP Conf. Proc. 1246, 127 (2010) | 10.1063/1.3460187 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present some of the recent results and open questions on the causality
problem in General Relativity. The concept of singularity is intimately
connected with future trapped surface and inner event horizon formation. We
offer a brief overview of the Hawking Penrose singularity theorems and discuss
a few open proble... | [
{
"created": "Tue, 26 Jan 2016 02:04:48 GMT",
"version": "v1"
}
] | 2016-01-27 | [
[
"Howard",
"E. M.",
""
]
] | We present some of the recent results and open questions on the causality problem in General Relativity. The concept of singularity is intimately connected with future trapped surface and inner event horizon formation. We offer a brief overview of the Hawking Penrose singularity theorems and discuss a few open problems... |
2407.20345 | Raissa Mendes | Raissa F. P. Mendes, Caroline F. Sodr\'e, Felipe T. Falciano | Exceeding the conformal limit inside rotating neutron stars:
Implications to modified theories of gravity | 10 pages, 7 figures | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | At the supranuclear densities achieved inside a neutron star, matter may
exhibit extreme properties. In particular, it may be the case that a suitable
average of the speed of sound squared exceeds the so-called conformal limit,
i.e., $\langle c_s^2 \rangle > 1/3$, a condition that is equivalent to the
positiveness of... | [
{
"created": "Mon, 29 Jul 2024 18:00:55 GMT",
"version": "v1"
}
] | 2024-07-31 | [
[
"Mendes",
"Raissa F. P.",
""
],
[
"Sodré",
"Caroline F.",
""
],
[
"Falciano",
"Felipe T.",
""
]
] | At the supranuclear densities achieved inside a neutron star, matter may exhibit extreme properties. In particular, it may be the case that a suitable average of the speed of sound squared exceeds the so-called conformal limit, i.e., $\langle c_s^2 \rangle > 1/3$, a condition that is equivalent to the positiveness of t... |
0803.3559 | {\L}ukasz Szulc | Lukasz Szulc | Loop Quantum Cosmology of Diagonal Bianchi Type I model: simplifications
and scaling problems | 11 pages, 12 figures, version to appear in PRD | Phys.Rev.D78:064035,2008 | 10.1103/PhysRevD.78.064035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A simplified theory of the diagonal Bianchi type I model coupled with a
massless scalar field in loop quantum cosmology is constructed according to the
$\bar{\mu}$ scheme. Kinematical and physical sectors of the theory are under
good analytical control as well as the scalar constraint operator. Although it
is possibl... | [
{
"created": "Tue, 25 Mar 2008 13:31:49 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Aug 2008 11:34:29 GMT",
"version": "v2"
}
] | 2009-02-20 | [
[
"Szulc",
"Lukasz",
""
]
] | A simplified theory of the diagonal Bianchi type I model coupled with a massless scalar field in loop quantum cosmology is constructed according to the $\bar{\mu}$ scheme. Kinematical and physical sectors of the theory are under good analytical control as well as the scalar constraint operator. Although it is possible ... |
1706.05455 | Seth Hopper | Seth Hopper | Unbound motion on a Schwarzschild background: Practical approaches to
frequency domain computations | 12 pages, 3 figures | Phys. Rev. D 97, 064007 (2018) | 10.1103/PhysRevD.97.064007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational perturbations due to a point particle moving on a static black
hole background are naturally described in Regge-Wheeler gauge. The first-order
field equations reduce to a single master wave equation for each radiative
mode. The master function satisfying this wave equation is a linear combination
of the... | [
{
"created": "Sat, 17 Jun 2017 00:06:53 GMT",
"version": "v1"
}
] | 2018-03-21 | [
[
"Hopper",
"Seth",
""
]
] | Gravitational perturbations due to a point particle moving on a static black hole background are naturally described in Regge-Wheeler gauge. The first-order field equations reduce to a single master wave equation for each radiative mode. The master function satisfying this wave equation is a linear combination of the m... |
gr-qc/0409097 | Parthasarathi Majumdar | Ashok Chatterjee and Parthasarathi Majumdar | Mass and charge fluctuations and black hole entropy | 8 pages revtex, no figures | Phys.Rev. D71 (2005) 024003 | 10.1103/PhysRevD.71.024003 | null | gr-qc | null | The effects of thermal fluctuations of the mass (horizon area) and electric
charge, on the entropy of non-rotating charged {\it macroscopic} black holes,
are analyzed using a grand canonical ensemble. Restricting to Gaussian
fluctuations around equilibrium, and assuming a power law type of relation
between the black ... | [
{
"created": "Mon, 27 Sep 2004 09:25:09 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Chatterjee",
"Ashok",
""
],
[
"Majumdar",
"Parthasarathi",
""
]
] | The effects of thermal fluctuations of the mass (horizon area) and electric charge, on the entropy of non-rotating charged {\it macroscopic} black holes, are analyzed using a grand canonical ensemble. Restricting to Gaussian fluctuations around equilibrium, and assuming a power law type of relation between the black ho... |
1601.04666 | Michael Cole | Michael J. Cole, Juan A. Valiente Kroon | Killing spinors as a characterisation of rotating black hole spacetimes | 18 pages | null | 10.1088/0264-9381/33/12/125019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the implications of the existence of Killing spinors in a
spacetime. In particular, we show that in vacuum and electrovacuum a Killing
spinor, along with some assumptions on the associated Killing vector in an
asymptotic region, guarantees that the spacetime is locally isometric to the
Kerr or Kerr-New... | [
{
"created": "Mon, 18 Jan 2016 19:38:17 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Apr 2016 15:43:42 GMT",
"version": "v2"
}
] | 2016-05-25 | [
[
"Cole",
"Michael J.",
""
],
[
"Kroon",
"Juan A. Valiente",
""
]
] | We investigate the implications of the existence of Killing spinors in a spacetime. In particular, we show that in vacuum and electrovacuum a Killing spinor, along with some assumptions on the associated Killing vector in an asymptotic region, guarantees that the spacetime is locally isometric to the Kerr or Kerr-Newma... |
1606.08569 | Daria Tretyakova | D.A. Tretyakova | Horndeski black hole observational properties | 16 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine geodesics for scalar-tensor black holes in the Horndeski-Galileon
non-minimal kinetic coupling framework. Our analysis shows that bound orbits
may not be present within some model parameters range. Using the observational
data we pose bounds on possible solution parameter values, as well as initial
model p... | [
{
"created": "Tue, 28 Jun 2016 06:20:36 GMT",
"version": "v1"
},
{
"created": "Sat, 2 Jul 2016 08:28:07 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Oct 2016 09:21:36 GMT",
"version": "v3"
}
] | 2016-10-13 | [
[
"Tretyakova",
"D. A.",
""
]
] | We examine geodesics for scalar-tensor black holes in the Horndeski-Galileon non-minimal kinetic coupling framework. Our analysis shows that bound orbits may not be present within some model parameters range. Using the observational data we pose bounds on possible solution parameter values, as well as initial model par... |
2309.14318 | Hirotaka Yoshino | Hirotaka Yoshino | Distorted static photon surfaces in perturbed Reissner-Nordstr\"om
spacetimes | 40 pages , 5 figures | null | null | OCU-PHYS-585, AP-GR-194 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The photon surface is defined as a timelike surface $S$ such that any photon
emitted in arbitrary tangential direction to $S$ from an arbitrary point on $S$
continues to propagate on $S$. In this paper, we examine whether a static
photon surface can be present in distorted electrovacuum spacetimes with
perturbative a... | [
{
"created": "Mon, 25 Sep 2023 17:43:19 GMT",
"version": "v1"
}
] | 2023-09-26 | [
[
"Yoshino",
"Hirotaka",
""
]
] | The photon surface is defined as a timelike surface $S$ such that any photon emitted in arbitrary tangential direction to $S$ from an arbitrary point on $S$ continues to propagate on $S$. In this paper, we examine whether a static photon surface can be present in distorted electrovacuum spacetimes with perturbative app... |
gr-qc/0401117 | John W. Moffat | J. W. Moffat | Quantum Gravity Momentum Representation and Maximum Invariant Energy | 16 pages, LateX file, no figures | Int. J. Geometric Methods in Mod. Phys., 13(1), 1650005 (2016) | 10.1142/S0219887816500055 | null | gr-qc astro-ph hep-ph hep-th | null | We use the idea of the symmetry between the spacetime coordinates x^\mu and
the energy-momentum p^\mu in quantum theory to construct a momentum space
quantum gravity geometry with a metric s_{\mu\nu} and a curvature
P^\lambda_{\mu\nu\rho}. For a closed maximally symmetric momentum space with a
constant 3-curvature, t... | [
{
"created": "Thu, 29 Jan 2004 00:57:21 GMT",
"version": "v1"
}
] | 2016-03-08 | [
[
"Moffat",
"J. W.",
""
]
] | We use the idea of the symmetry between the spacetime coordinates x^\mu and the energy-momentum p^\mu in quantum theory to construct a momentum space quantum gravity geometry with a metric s_{\mu\nu} and a curvature P^\lambda_{\mu\nu\rho}. For a closed maximally symmetric momentum space with a constant 3-curvature, the... |
2208.09024 | Lukasz Bratek | {\L}ukasz Bratek, Joanna Ja{\l}ocha, Marek Kutschera | Cylindrically symmetric radial accretion onto a Levi-Civita string-like
source | This is not the final published version | Phys. Rev. D 105, 023013 (2022) | 10.1103/PhysRevD.105.023013 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Radial steady-state accretion of polytropic matter is investigated under
cylindrical symmetry in the Levi-Civita background metric. The model can be
considered as a cylindrical analog of Bondi accretion in strong gravitational
field. As a byproduct of this study, the issue of defining the line mass
density is address... | [
{
"created": "Thu, 18 Aug 2022 18:57:13 GMT",
"version": "v1"
}
] | 2022-08-22 | [
[
"Bratek",
"Łukasz",
""
],
[
"Jałocha",
"Joanna",
""
],
[
"Kutschera",
"Marek",
""
]
] | Radial steady-state accretion of polytropic matter is investigated under cylindrical symmetry in the Levi-Civita background metric. The model can be considered as a cylindrical analog of Bondi accretion in strong gravitational field. As a byproduct of this study, the issue of defining the line mass density is addressed... |
1809.01385 | Muzaffer Adak | Muzaffer Adak | Gauge Approach to The Symmetric Teleparallel Gravity | This is the improved version of our manuscript arXiv:0810.2388v1. To
appear in International Journal of Geometric Methods in Modern Physics | Int. J. Geomet. Meth. Modern Phys. 15 (2018) 1850198 | 10.1142/S0219887818501980 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a gauge invariant gravity model in a non-Riemannian geometry in
which the curvature and the torsion both are zero, the nonmetricity is nonzero.
We also argue that only a metric ansatz is enough to start finding solutions to
the field equations. As an application we obtain explicitly a conformally flat
solu... | [
{
"created": "Wed, 5 Sep 2018 08:40:07 GMT",
"version": "v1"
}
] | 2020-11-24 | [
[
"Adak",
"Muzaffer",
""
]
] | We discuss a gauge invariant gravity model in a non-Riemannian geometry in which the curvature and the torsion both are zero, the nonmetricity is nonzero. We also argue that only a metric ansatz is enough to start finding solutions to the field equations. As an application we obtain explicitly a conformally flat soluti... |
gr-qc/0503013 | Donald Salisbury | J. M. Pons and D. C. Salisbury | The issue of time in generally covariant theories and the Komar-Bergmann
approach to observables in general relativity | null | Phys.Rev. D71 (2005) 124012 | 10.1103/PhysRevD.71.124012 | null | gr-qc | null | Diffeomorphism-induced symmetry transformations and time evolution are
distinct operations in generally covariant theories formulated in phase space.
Time is not frozen. Diffeomorphism invariants are consequently not necessarily
constants of the motion. Time-dependent invariants arise through the choice of
an intrins... | [
{
"created": "Thu, 3 Mar 2005 19:05:48 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Pons",
"J. M.",
""
],
[
"Salisbury",
"D. C.",
""
]
] | Diffeomorphism-induced symmetry transformations and time evolution are distinct operations in generally covariant theories formulated in phase space. Time is not frozen. Diffeomorphism invariants are consequently not necessarily constants of the motion. Time-dependent invariants arise through the choice of an intrinsic... |
gr-qc/0606132 | Jaap Eldering | Jaap Eldering | The polygon model for 2+1D gravity: the constraint algebra and problems
of quantization | 69 pages, 22 figures, LaTeX, Master thesis | null | null | null | gr-qc | null | In this Master thesis we consider 't Hooft's polygon model for 2+1D gravity.
After a detailed review of the polygon model in the classical context, we
discuss problems associated with its quantization and calculate the explicitly
the full Poisson structure of the constraints.
The calculation of the Poisson structur... | [
{
"created": "Fri, 30 Jun 2006 10:14:17 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Eldering",
"Jaap",
""
]
] | In this Master thesis we consider 't Hooft's polygon model for 2+1D gravity. After a detailed review of the polygon model in the classical context, we discuss problems associated with its quantization and calculate the explicitly the full Poisson structure of the constraints. The calculation of the Poisson structure in... |
1405.4155 | Alessandro D.A.M. Spallicci di Filottrano | Alessandro D.A.M. Spallicci, P. Ritter, S. Aoudia | Self-force driven motion in curved spacetimes | To appear in Int. J. Geom. Meth. Mod. Phys | 2014, Int. J. Geom. Meth. Mod. Phys., 11, 1450072 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We adopt the Dirac-Detweiler-Whiting radiative and regular effective field in
curved spacetime. Thereby, we derive straightforwardly the first order
perturbative correction to the geodesic of the background in a covariant form,
for the extreme mass ratio two-body problem. The correction contains the
self-force contri... | [
{
"created": "Fri, 16 May 2014 13:00:25 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Spallicci",
"Alessandro D. A. M.",
""
],
[
"Ritter",
"P.",
""
],
[
"Aoudia",
"S.",
""
]
] | We adopt the Dirac-Detweiler-Whiting radiative and regular effective field in curved spacetime. Thereby, we derive straightforwardly the first order perturbative correction to the geodesic of the background in a covariant form, for the extreme mass ratio two-body problem. The correction contains the self-force contribu... |
1805.01097 | Lu\'is Filipe Costa | L. Filipe O. Costa, Rita Franco, Vitor Cardoso | Gravitational Magnus effect | 28 pages, 9 figures. References added, matches the final published
version | Phys. Rev. D 98, 024026 (2018) | 10.1103/PhysRevD.98.024026 | null | gr-qc astro-ph.HE hep-th physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that a spinning body moving in a fluid suffers a force
orthogonal to its velocity and rotation axis --- it is called the Magnus
effect. Recent simulations of spinning black holes and (indirect) theoretical
predictions, suggest that a somewhat analogous effect may occur for purely
gravitational phenom... | [
{
"created": "Thu, 3 May 2018 03:25:23 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jul 2018 22:22:47 GMT",
"version": "v2"
}
] | 2018-07-27 | [
[
"Costa",
"L. Filipe O.",
""
],
[
"Franco",
"Rita",
""
],
[
"Cardoso",
"Vitor",
""
]
] | It is well known that a spinning body moving in a fluid suffers a force orthogonal to its velocity and rotation axis --- it is called the Magnus effect. Recent simulations of spinning black holes and (indirect) theoretical predictions, suggest that a somewhat analogous effect may occur for purely gravitational phenomen... |
1505.01565 | Habibollah Razmi | S. Karbasi and H. Razmi | Spherical "Top-Hat" Collapse in a Modified Chaplygin Gas Dominated
Universe | 16 pages, 16 figures | International Journal of Modern Physics D, Vol. 24, No. 7, 1550050
(2015) | 10.1142/S0218271815500509 | null | gr-qc astro-ph.CO astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering perturbation growth in spherical Top-Hat model of structure
formation in a generalized Chaplygin gas dominated universe, we want to study
this scenario with a modified Chaplygin gas model. The evolution of background
and collapsed region parameters are found for different cases. The stability of
the model... | [
{
"created": "Wed, 6 May 2015 12:04:48 GMT",
"version": "v1"
},
{
"created": "Fri, 8 May 2015 07:23:37 GMT",
"version": "v2"
}
] | 2015-05-11 | [
[
"Karbasi",
"S.",
""
],
[
"Razmi",
"H.",
""
]
] | Considering perturbation growth in spherical Top-Hat model of structure formation in a generalized Chaplygin gas dominated universe, we want to study this scenario with a modified Chaplygin gas model. The evolution of background and collapsed region parameters are found for different cases. The stability of the model a... |
gr-qc/0312034 | Clemens Heuson | Clemens Heuson | Noncommutative Space-Time in DSR theories | 5 pages, no figures | null | null | null | gr-qc | null | Space-time coordinates in DSR theories with two invariant scales based on a
dispersion relation with an energy independent speed of light are introduced by
the demand, that boost and rotation generators are invariant under a
transformation from SR to DSR variables. This turns out to be equivalent to a
recent suggesti... | [
{
"created": "Fri, 5 Dec 2003 10:21:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Heuson",
"Clemens",
""
]
] | Space-time coordinates in DSR theories with two invariant scales based on a dispersion relation with an energy independent speed of light are introduced by the demand, that boost and rotation generators are invariant under a transformation from SR to DSR variables. This turns out to be equivalent to a recent suggestion... |
2109.09865 | Jose Jovel | Norman Cruz, Esteban Gonz\'alez, and Jos\'e Jovel | Singularities and Soft-Big Bang in a viscous $\Lambda$CDM model | 17 pages, 13 figures | null | 10.1103/PhysRevD.105.024047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we explore the different types of singularities that arise in
the $\Lambda$CDM model when dissipative processes are considered, in the
framework of the Eckart's theory. In particular, we study the late-time
behavior of $\Lambda$CDM model with viscous cold dark matter (CDM) and an
early-time viscous radi... | [
{
"created": "Mon, 20 Sep 2021 22:19:13 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jan 2022 22:37:22 GMT",
"version": "v2"
}
] | 2022-02-02 | [
[
"Cruz",
"Norman",
""
],
[
"González",
"Esteban",
""
],
[
"Jovel",
"José",
""
]
] | In this paper we explore the different types of singularities that arise in the $\Lambda$CDM model when dissipative processes are considered, in the framework of the Eckart's theory. In particular, we study the late-time behavior of $\Lambda$CDM model with viscous cold dark matter (CDM) and an early-time viscous radiat... |
gr-qc/0508104 | Johan Noldus | Johan Noldus | Towards a fully consistent relativistic quantum mechanics and a change
of perspective on quantum gravity | 17 pages, no figures, entire subsection added. submitted to CQG | null | null | null | gr-qc quant-ph | null | This paper can be seen as an exercise in how to adapt quantum mechanics from
a strict relativistic perspective while being respectful and critical towards
the experimental achievements of the contemporary theory. The result is a fully
observer independent relativistic quantum mechanics for N particle systems
without ... | [
{
"created": "Fri, 26 Aug 2005 12:46:01 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Sep 2005 21:38:42 GMT",
"version": "v2"
},
{
"created": "Sat, 10 Sep 2005 09:33:54 GMT",
"version": "v3"
},
{
"created": "Mon, 10 Oct 2005 17:24:46 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Noldus",
"Johan",
""
]
] | This paper can be seen as an exercise in how to adapt quantum mechanics from a strict relativistic perspective while being respectful and critical towards the experimental achievements of the contemporary theory. The result is a fully observer independent relativistic quantum mechanics for N particle systems without ta... |
0906.1442 | Yuri Pavlov | A. A. Grib, Yu. V. Pavlov | Is it possible to see the infinite future of the Universe when falling
into a black hole? | 12 pages, 2 figures; Methodological Notes | Usp.Fiz.Nauk 179:279-283,2009 | 10.3367/UFNe.0179.200903d.0279 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A possibility to see the infinite future of the Universe by an astronaut
falling into a black hole is discussed and ruled out.
| [
{
"created": "Mon, 8 Jun 2009 09:13:38 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Grib",
"A. A.",
""
],
[
"Pavlov",
"Yu. V.",
""
]
] | A possibility to see the infinite future of the Universe by an astronaut falling into a black hole is discussed and ruled out. |
gr-qc/9402006 | Juan Pablo | Wojciech Hubert Zurek and Juan Pablo Paz | Decoherence, Chaos, and the Second Law | 13 Pages, 2 Figures available upon request, Preprint LA-UR-93-, The
new version contains the text, the previous one had only the Macros: sorry! | Phys.Rev.Lett.72:2508,1994 | 10.1103/PhysRevLett.72.2508 | null | gr-qc hep-th | null | We investigate implications of decoherence for quantum systems which are
classically chaotic. We show that, in open systems, the rate of von Neumann
entropy production quickly reaches an asymptotic value which is: (i)
independent of the system-environment coupling, (ii) dictated by the dynamics
of the system, and (ii... | [
{
"created": "Wed, 2 Feb 1994 17:33:22 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Feb 1994 19:18:39 GMT",
"version": "v2"
}
] | 2011-08-04 | [
[
"Zurek",
"Wojciech Hubert",
""
],
[
"Paz",
"Juan Pablo",
""
]
] | We investigate implications of decoherence for quantum systems which are classically chaotic. We show that, in open systems, the rate of von Neumann entropy production quickly reaches an asymptotic value which is: (i) independent of the system-environment coupling, (ii) dictated by the dynamics of the system, and (iii)... |
1302.6920 | Lorenzo Iorio | L. Iorio | A possible new test of general relativity with Juno | LaTex2e, 16 pages, no tables, 2 figures, 39 references. Version
published in Classical and Quantum Gravity (CQG) | Class. Quant. Gravit.30:195011,2013 | 10.1088/0264-9381/30/19/195011 | null | gr-qc astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The expansion in multipoles of the gravitational potential of a rotating body
affects the orbital motion of a test particle orbiting it with long-term
perturbations both at a classical and at a relativistic level. In this
preliminary sensitivity analysis, we show that, for the first time, the J2 c^-2
effects could be... | [
{
"created": "Wed, 27 Feb 2013 16:52:00 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Mar 2013 16:10:41 GMT",
"version": "v2"
},
{
"created": "Fri, 3 May 2013 20:42:37 GMT",
"version": "v3"
},
{
"created": "Fri, 9 Aug 2013 16:53:32 GMT",
"version": "v4"
},
{
"crea... | 2013-09-10 | [
[
"Iorio",
"L.",
""
]
] | The expansion in multipoles of the gravitational potential of a rotating body affects the orbital motion of a test particle orbiting it with long-term perturbations both at a classical and at a relativistic level. In this preliminary sensitivity analysis, we show that, for the first time, the J2 c^-2 effects could be m... |
gr-qc/9601035 | Yoav Peleg | Sukanta Bose, Leonard Parker and Yoav Peleg (UWM) | Validity of the Semiclassical Approximation and Back=reaction | RevTex, 14 pages + 1 figure (uucompressed) | Phys.Rev. D53 (1996) 7089-7093 | 10.1103/PhysRevD.53.7089 | WISC-MILW-96-TH-10 | gr-qc hep-th | null | Studying two-dimensional evaporating dilatonic black holes, we show that the
semiclassical approximation, based on the background field approach, is valid
everywhere in regions of weak curvature (including the horizon), as long as one
takes into account the effects of back-reaction of the Hawking radiation on the
bac... | [
{
"created": "Mon, 22 Jan 1996 21:42:47 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Bose",
"Sukanta",
"",
"UWM"
],
[
"Parker",
"Leonard",
"",
"UWM"
],
[
"Peleg",
"Yoav",
"",
"UWM"
]
] | Studying two-dimensional evaporating dilatonic black holes, we show that the semiclassical approximation, based on the background field approach, is valid everywhere in regions of weak curvature (including the horizon), as long as one takes into account the effects of back-reaction of the Hawking radiation on the backg... |
2208.02599 | Andronikos Paliathanasis | Andronikos Paliathanasis | New exact and analytic solutions in Weyl Integrable cosmology from
Noether symmetry analysis | 16 pages, 1 Fig. to appear in Physica Scripta | null | 10.1088/1402-4896/ac8702 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider a cosmological model in a
Friedmann--Lema\^{\i}tre--Robertson--Walker background space with an ideal gas
defined in Weyl Integrable gravity. In the Einstein-Weyl theory a scalar field
is introduced in a geometric way. Furthermore, the scalar field and the ideal
gas interact in the gravitational Action Int... | [
{
"created": "Thu, 4 Aug 2022 11:55:27 GMT",
"version": "v1"
}
] | 2022-08-24 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | We consider a cosmological model in a Friedmann--Lema\^{\i}tre--Robertson--Walker background space with an ideal gas defined in Weyl Integrable gravity. In the Einstein-Weyl theory a scalar field is introduced in a geometric way. Furthermore, the scalar field and the ideal gas interact in the gravitational Action Integ... |
1711.09484 | Osvaldo Pablo Santillan | Juan M. Armaleo, J. Osorio Morales and O. Santillan | Gauss-Bonnet models with cosmological constant and non zero spatial
curvature in $D=4$ | Grammar corrected and some confusing notation was modified. 24 pages | null | 10.1140/epjc/s10052-018-5558-x | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper the possibility of eternal universes in Gauss-Bonnet
theories of gravity in four dimensions is analysed. It is shown that, for zero
spatial curvature and zero cosmological constant, if the coupling is such that
$0<f'(\phi)\leq c \exp(\frac{\sqrt{8}}{\sqrt{10}}\phi)$, then there are
solutions that... | [
{
"created": "Sun, 26 Nov 2017 23:02:15 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Jan 2018 19:56:52 GMT",
"version": "v2"
}
] | 2018-03-14 | [
[
"Armaleo",
"Juan M.",
""
],
[
"Morales",
"J. Osorio",
""
],
[
"Santillan",
"O.",
""
]
] | In the present paper the possibility of eternal universes in Gauss-Bonnet theories of gravity in four dimensions is analysed. It is shown that, for zero spatial curvature and zero cosmological constant, if the coupling is such that $0<f'(\phi)\leq c \exp(\frac{\sqrt{8}}{\sqrt{10}}\phi)$, then there are solutions that a... |
1006.3130 | Subenoy Chakraborty | Ritabrata Biswas, Nairwita Mazumder, Subenoy Chakraborty | Accretion of Holographic Dark Energy : Dependency only upon Horizon
Radius of Expanding Universe | 11 pages | Astrophys.Space Sci.335:603-609,2011 | 10.1007/s10509-011-0772-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we deal with accretion of dark energy in the holographic dark
energy model for a general non-rotating static spherically symmetric black
hole. The mass of the black hole increases or decreases depending on the nature
of the holographic dark energy (quintessence or phantom) as well as on some
integration... | [
{
"created": "Wed, 16 Jun 2010 03:58:53 GMT",
"version": "v1"
},
{
"created": "Wed, 4 May 2011 12:14:21 GMT",
"version": "v2"
}
] | 2011-09-12 | [
[
"Biswas",
"Ritabrata",
""
],
[
"Mazumder",
"Nairwita",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In this paper we deal with accretion of dark energy in the holographic dark energy model for a general non-rotating static spherically symmetric black hole. The mass of the black hole increases or decreases depending on the nature of the holographic dark energy (quintessence or phantom) as well as on some integration p... |
2008.10474 | Chikun Ding | Chikun Ding, Xiongwen Chen | Slowly rotating Einstein-bumblebee black hole solution and its greybody
factor in a Lorentz violation model | 17 pages, 3 figures. Accepted by Chin. Phys. C | Chin. Phys. C 45 025106 2021 | 10.1088/1674-1137/abce51 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain an exact slowly rotating Einstein-bumblebee black hole solution by
solving the corresponding $rr$ and $t\phi$ components of the gravitational
field equations in both cases: A, $b_\mu=(0,b(r),0,0)$; B,
$b_\mu=(0,b(r),\mathfrak{b}(\theta),0)$. Then we check the other gravitational
field equations and the bumb... | [
{
"created": "Fri, 21 Aug 2020 00:38:34 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Nov 2020 07:57:28 GMT",
"version": "v2"
}
] | 2021-02-19 | [
[
"Ding",
"Chikun",
""
],
[
"Chen",
"Xiongwen",
""
]
] | We obtain an exact slowly rotating Einstein-bumblebee black hole solution by solving the corresponding $rr$ and $t\phi$ components of the gravitational field equations in both cases: A, $b_\mu=(0,b(r),0,0)$; B, $b_\mu=(0,b(r),\mathfrak{b}(\theta),0)$. Then we check the other gravitational field equations and the bumble... |
0808.0318 | Kourosh Nozari | Kourosh Nozari, N. Behrouz, T. Azizi and B. Fazlpour | Crossing the Cosmological Constant Line on a Warped DGP Brane | 28 pages, 8 figures, 2 tables, revised version to appear in Prog.
Theor. Phys | Prog.Theor.Phys.122:735-754,2009 | 10.1143/PTP.122.735 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study dynamics of the equation of state parameter for a dark energy
component non-minimally coupled to induced gravity on a warped DGP brane. We
show that there are appropriate domains of the model parameters space that
account for crossing of the phantom divide line. This crossing, which is
possible for both bran... | [
{
"created": "Sun, 3 Aug 2008 12:15:07 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Dec 2008 08:41:32 GMT",
"version": "v2"
},
{
"created": "Sat, 20 Jun 2009 13:15:24 GMT",
"version": "v3"
}
] | 2010-05-12 | [
[
"Nozari",
"Kourosh",
""
],
[
"Behrouz",
"N.",
""
],
[
"Azizi",
"T.",
""
],
[
"Fazlpour",
"B.",
""
]
] | We study dynamics of the equation of state parameter for a dark energy component non-minimally coupled to induced gravity on a warped DGP brane. We show that there are appropriate domains of the model parameters space that account for crossing of the phantom divide line. This crossing, which is possible for both branch... |
2007.08038 | Mingzhe Li | Mingzhe Li, Haomin Rao, Dehao Zhao | A simple parity violating gravity model without ghost instability | The version matches the one to appear in JCAP | null | 10.1088/1475-7516/2020/11/023 | USTC-ICTS/PCFT-20-19 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider a parity violating gravity model without higher
derivatives, thus ghost free. This model is constructed from the tetrad and its
derivatives and coupled to a dynamical scalar field, like axion. It can be
reduced from the Nieh-Yan term within the framework of teleparallel gravity. We
apply thi... | [
{
"created": "Wed, 15 Jul 2020 23:59:03 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Jul 2020 08:06:07 GMT",
"version": "v2"
},
{
"created": "Wed, 7 Oct 2020 04:24:39 GMT",
"version": "v3"
}
] | 2020-11-25 | [
[
"Li",
"Mingzhe",
""
],
[
"Rao",
"Haomin",
""
],
[
"Zhao",
"Dehao",
""
]
] | In this paper we consider a parity violating gravity model without higher derivatives, thus ghost free. This model is constructed from the tetrad and its derivatives and coupled to a dynamical scalar field, like axion. It can be reduced from the Nieh-Yan term within the framework of teleparallel gravity. We apply this ... |
1403.0109 | Amalaya Khurshudyan | Martiros Khurshudyan | Toy models of Universe with an Effective varying $\Lambda$-Term in Lyra
Manifold | null | Advances in High Energy Physics Volume 2015 (2015), Article ID
796168 | 10.1155/2015/796168 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We are interested by the study of several toy models of the Universe in
presence of interacting quintessence DE models. Models are considered in the
cosmology with an Effective varying $\Lambda$-Term in Lyra Manifold. The
motivation of the phenomenological models discussed in this paper is to obtain
corresponding mod... | [
{
"created": "Sat, 1 Mar 2014 17:54:34 GMT",
"version": "v1"
}
] | 2015-09-16 | [
[
"Khurshudyan",
"Martiros",
""
]
] | We are interested by the study of several toy models of the Universe in presence of interacting quintessence DE models. Models are considered in the cosmology with an Effective varying $\Lambda$-Term in Lyra Manifold. The motivation of the phenomenological models discussed in this paper is to obtain corresponding model... |
1802.06553 | Raihaneh Moti | R. Moti and A. Shojai (Tehran U.) | On the quantum improved Schwarzschild black hole | null | Int.J.Mod.Phys. A35 (2020) 2050016 | 10.1142/S0217751X20500165 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Deriving the gravitational effective action directly from exact
renormalization group is very complicated, if not impossible. Hence, to study
the effects of running gravitational coupling which tends to a non--Gaussian UV
fixed point (as it is supposed by the asymptotic safety conjecture), two steps
are usually adopt... | [
{
"created": "Mon, 19 Feb 2018 09:00:59 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Jul 2019 08:39:12 GMT",
"version": "v2"
},
{
"created": "Thu, 20 Feb 2020 17:36:45 GMT",
"version": "v3"
}
] | 2020-04-29 | [
[
"Moti",
"R.",
"",
"Tehran U."
],
[
"Shojai",
"A.",
"",
"Tehran U."
]
] | Deriving the gravitational effective action directly from exact renormalization group is very complicated, if not impossible. Hence, to study the effects of running gravitational coupling which tends to a non--Gaussian UV fixed point (as it is supposed by the asymptotic safety conjecture), two steps are usually adopted... |
1706.00622 | Charles Hellaby | Charles Hellaby | Frame Rotation in the Szekeres Spacetimes | 21 pages, no figures. V2 has a few minor corrections | Classical and Quantum Gravity, 34, 145006, 1-20 (2017) | 10.1088/1361-6382/aa76f8 | uct-cosmology-2017-06-02-12-49 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Szekeres metric is an inhomogeneous cosmological model without any
symmetries. The standard Riemann-type coordinates can be transformed into
spherical-type coordinates, but the metric is no longer diagonal, and the
constant "radius" 2-spheres, 2-hyperboloids or 2-planes are known to be
"non-concentric". Since the... | [
{
"created": "Fri, 2 Jun 2017 10:51:02 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jun 2017 14:59:18 GMT",
"version": "v2"
}
] | 2017-06-27 | [
[
"Hellaby",
"Charles",
""
]
] | The Szekeres metric is an inhomogeneous cosmological model without any symmetries. The standard Riemann-type coordinates can be transformed into spherical-type coordinates, but the metric is no longer diagonal, and the constant "radius" 2-spheres, 2-hyperboloids or 2-planes are known to be "non-concentric". Since the t... |
1901.04300 | Antonella Cid | Fabiola Arevalo, Antonella Cid, Luis P. Chimento and Patricio Mella | On sign-changeable interaction in FLRW cosmology | 8 figures | null | 10.1140/epjc/s10052-019-6872-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate an interacting two-fluid model in a spatially flat
Friedmann-Lema\^itre-Robertson-Walker (FLRW) Universe, when the energy transfer
between these two dark components is produced by a factorisable nonlinear
sign-changeable interaction depending linearly on the energy density and
quadratically on the dece... | [
{
"created": "Fri, 4 Jan 2019 21:29:53 GMT",
"version": "v1"
}
] | 2019-05-22 | [
[
"Arevalo",
"Fabiola",
""
],
[
"Cid",
"Antonella",
""
],
[
"Chimento",
"Luis P.",
""
],
[
"Mella",
"Patricio",
""
]
] | We investigate an interacting two-fluid model in a spatially flat Friedmann-Lema\^itre-Robertson-Walker (FLRW) Universe, when the energy transfer between these two dark components is produced by a factorisable nonlinear sign-changeable interaction depending linearly on the energy density and quadratically on the decele... |
1505.00481 | Gines Perez Teruel | Gin\'es R. P\'erez Teruel | Non-linear energy conservation theorem in the framework of Special
Relativity | null | Eur. J. Phys. 36 045009 (2015) | 10.1088/0143-0807/36/4/045009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we revisit the study of the gravitational interaction in the
context of the Special Theory of Relativity. It is found that, as long as the
equivalence principle is respected, a relativistic non-linear energy
conservation theorem arises in a natural way. We interpret that this non-linear
conservation law ... | [
{
"created": "Sun, 3 May 2015 21:43:54 GMT",
"version": "v1"
}
] | 2015-05-05 | [
[
"Teruel",
"Ginés R. Pérez",
""
]
] | In this work we revisit the study of the gravitational interaction in the context of the Special Theory of Relativity. It is found that, as long as the equivalence principle is respected, a relativistic non-linear energy conservation theorem arises in a natural way. We interpret that this non-linear conservation law st... |
1303.5602 | Supriya Pan | Supriya Pan and Subenoy Chakraborty | Will there be again a transition from acceleration to deceleration in
course of the dark energy evolution of the universe? | 15 pages, 3 figures, 1 table | Eur. Phys. J. C (2013) 73:2575 | 10.1140/epjc/s10052-013-2575-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we consider the evolution of the interactive dark fluids in the
background of homogeneous and isotropic FRW model of the universe. The dark
fluids consist of a warm dark matter and a dark energy and both are described
as perfect fluid with barotropic equation of state. The dark species interact
non-gravi... | [
{
"created": "Fri, 22 Mar 2013 12:57:38 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Apr 2013 11:07:46 GMT",
"version": "v2"
},
{
"created": "Sat, 28 Sep 2013 11:16:28 GMT",
"version": "v3"
}
] | 2013-10-01 | [
[
"Pan",
"Supriya",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In this work we consider the evolution of the interactive dark fluids in the background of homogeneous and isotropic FRW model of the universe. The dark fluids consist of a warm dark matter and a dark energy and both are described as perfect fluid with barotropic equation of state. The dark species interact non-gravita... |
2107.05609 | Maximiliano Isi | Maximiliano Isi and Will M. Farr | Analyzing black-hole ringdowns | 34 pages and 35 figures, plus appendices | null | null | LIGO-P2100227 | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | A perturbed black hole rings down by emitting gravitational waves in tones
with specific frequencies and durations. Such tones encode prized information
about the geometry of the source spacetime and the fundamental nature of
gravity, making the measurement of black hole ringdowns a key goal of
gravitational wave ast... | [
{
"created": "Mon, 12 Jul 2021 17:45:56 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jul 2021 19:32:35 GMT",
"version": "v2"
}
] | 2021-07-15 | [
[
"Isi",
"Maximiliano",
""
],
[
"Farr",
"Will M.",
""
]
] | A perturbed black hole rings down by emitting gravitational waves in tones with specific frequencies and durations. Such tones encode prized information about the geometry of the source spacetime and the fundamental nature of gravity, making the measurement of black hole ringdowns a key goal of gravitational wave astro... |
2101.02125 | Giacomo Gradenigo | Giacomo Gradenigo, Roberto Livi | Symplectic quantization I: dynamics of quantum fluctuations in a
relativistic field theory | 7 pages | Found. Phys. 51, 66 (2021) | 10.1007/s10701-021-00470-9 | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose here a new symplectic quantization scheme, where quantum
fluctuations of a scalar field theory stem from two main assumptions:
relativistic invariance and equiprobability of the field configurations with
identical value of the action. In this approach the fictitious time of
stochastic quantization becomes ... | [
{
"created": "Wed, 6 Jan 2021 16:35:32 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jan 2021 12:21:06 GMT",
"version": "v2"
},
{
"created": "Thu, 27 May 2021 20:45:18 GMT",
"version": "v3"
}
] | 2021-06-03 | [
[
"Gradenigo",
"Giacomo",
""
],
[
"Livi",
"Roberto",
""
]
] | We propose here a new symplectic quantization scheme, where quantum fluctuations of a scalar field theory stem from two main assumptions: relativistic invariance and equiprobability of the field configurations with identical value of the action. In this approach the fictitious time of stochastic quantization becomes a ... |
gr-qc/0507129 | Filimonova Irina V | V. Aldaya, E. Sanchez-Sastre | Lagrangian Formalism on Jet-Gauge and Jet-Diffeomorphism Groups: Towards
a Unification of Gravity with Internal Gauge Interactions | Plenary talk presented at Workshop on High Energy Physics&Field
Theory (Protvino, Russia, 2004) | null | null | HEPFT/2004/10 | gr-qc | null | In this talk the description of gauge theories associated with internal
symmetries is extended to the case in which the symmetry group is the
space-time translation group (recovering Einstein's theory) using the standard
jet-bundle formalism. We also reformulate these theories introducing the idea
of jet-gauge and je... | [
{
"created": "Fri, 29 Jul 2005 07:16:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Aldaya",
"V.",
""
],
[
"Sanchez-Sastre",
"E.",
""
]
] | In this talk the description of gauge theories associated with internal symmetries is extended to the case in which the symmetry group is the space-time translation group (recovering Einstein's theory) using the standard jet-bundle formalism. We also reformulate these theories introducing the idea of jet-gauge and jet-... |
0708.1233 | Gaurang Mahajan | Gaurang Mahajan, T. Padmanabhan | Particle creation, classicality and related issues in quantum field
theory: I. Formalism and toy models | RevTeX 4; 32 pages; 28 figures; first of a series of two papers, the
second being arXiv:0708.1237 [gr-qc]; high resolution figures available from
the authors on request | Gen.Rel.Grav. 40 (2008) 661-708 | 10.1007/s10714-007-0526-z | null | gr-qc astro-ph hep-th | null | The quantum theory of a harmonic oscillator with a time dependent frequency
arises in several important physical problems, especially in the study of
quantum field theory in an external background. While the mathematics of this
system is straightforward, several conceptual issues arise in such a study. We
present a g... | [
{
"created": "Thu, 9 Aug 2007 10:16:29 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Mahajan",
"Gaurang",
""
],
[
"Padmanabhan",
"T.",
""
]
] | The quantum theory of a harmonic oscillator with a time dependent frequency arises in several important physical problems, especially in the study of quantum field theory in an external background. While the mathematics of this system is straightforward, several conceptual issues arise in such a study. We present a gen... |
1405.2783 | Christian Gr\~Af | C. Gr\"af, B. W. Barr, A. S. Bell, F. Campbell, A. V. Cumming, S. L.
Danilishin, N. A. Gordon, G. D. Hammond, J. Hennig, E. A. Houston, S. H.
Huttner, R. A. Jones, S. S. Leavey, H. L\"uck, J. Macarthur, M. Marwick, S.
Rigby, R. Schilling, B. Sorazu, A. Spencer, S. Steinlechner, K. A. Strain and
S. Hild | Design of a speed meter interferometer proof-of-principle experiment | Revised version: 16 pages, 6 figures | Class. Quantum Grav. 31 215009 (2014) | 10.1088/0264-9381/31/21/215009 | null | gr-qc physics.optics quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The second generation of large scale interferometric gravitational wave
detectors will be limited by quantum noise over a wide frequency range in their
detection band. Further sensitivity improvements for future upgrades or new
detectors beyond the second generation motivate the development of measurement
schemes to ... | [
{
"created": "Mon, 12 May 2014 14:38:18 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Sep 2014 15:49:14 GMT",
"version": "v2"
}
] | 2016-08-08 | [
[
"Gräf",
"C.",
""
],
[
"Barr",
"B. W.",
""
],
[
"Bell",
"A. S.",
""
],
[
"Campbell",
"F.",
""
],
[
"Cumming",
"A. V.",
""
],
[
"Danilishin",
"S. L.",
""
],
[
"Gordon",
"N. A.",
""
],
[
"Hammond",
... | The second generation of large scale interferometric gravitational wave detectors will be limited by quantum noise over a wide frequency range in their detection band. Further sensitivity improvements for future upgrades or new detectors beyond the second generation motivate the development of measurement schemes to mi... |
0808.1262 | Giovanni Marozzi Dr. | S. E. Joras and G. Marozzi | Trans-Planckian Physics from a Nonlinear Dispersion Relation | 11 pages, 10 figures. Some changes made, comments and references
added, a figure added, typos corrected, conclusions unchanged, version
accepted for pubblication in Phys. Rev. D | Phys.Rev.D79:023514,2009 | 10.1103/PhysRevD.79.023514 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a particular nonlinear dispersion relation $\omega_p(k_p)$ -- a
series expansion in the physical wavenumber $k_p$ -- for modeling first-order
corrections in the equation of motion of a test scalar field in a de Sitter
spacetime from trans-Planckian physics in cosmology. Using both a numerical
approach and a ... | [
{
"created": "Fri, 8 Aug 2008 18:16:23 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jan 2009 16:56:00 GMT",
"version": "v2"
}
] | 2009-02-26 | [
[
"Joras",
"S. E.",
""
],
[
"Marozzi",
"G.",
""
]
] | We study a particular nonlinear dispersion relation $\omega_p(k_p)$ -- a series expansion in the physical wavenumber $k_p$ -- for modeling first-order corrections in the equation of motion of a test scalar field in a de Sitter spacetime from trans-Planckian physics in cosmology. Using both a numerical approach and a se... |
2311.03274 | Abhishek Sharma | Abhishek Sharma, Soumen Roy, and Anand S. Sengupta | Template bank to search for exotic gravitational wave signals from
astrophysical compact binaries | 16 pages, 8 figures | Physical Review D (Vol. 109, No. 12), 2024 | 10.1103/PhysRevD.109.124049 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Modeled searches of gravitational wave signals from compact binary mergers
rely on template waveforms determined by the theory of general relativity (GR).
Once a signal is detected, one generally performs the model agnostic test of
GR, either looking for consistency between the GR waveform and data or
introducing phe... | [
{
"created": "Mon, 6 Nov 2023 17:17:01 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2024 18:04:19 GMT",
"version": "v2"
}
] | 2024-06-27 | [
[
"Sharma",
"Abhishek",
""
],
[
"Roy",
"Soumen",
""
],
[
"Sengupta",
"Anand S.",
""
]
] | Modeled searches of gravitational wave signals from compact binary mergers rely on template waveforms determined by the theory of general relativity (GR). Once a signal is detected, one generally performs the model agnostic test of GR, either looking for consistency between the GR waveform and data or introducing pheno... |
gr-qc/9908065 | Djordje Sijacki | I. Miskovic and Dj. Sijacki | Dirac-like Affine Fields in 3D | 4 pages, TeX; Talk given at the XI Yugoslav Symposium on Nuclear and
Particle Physics, Studenica, September 1998 | SFIN, XI A2 (1998) | null | null | gr-qc | null | A generalization of the Dirac field equation in three-dimensional Minkowski
space-time to the case of the $\bar{SL}(3,R)$ $\subset$ $\bar{SA}(3,R)$
symmetry is considered. Constraints that ensure a correct physical
interpretation of the corresponding particle states are presented. Dirac-like
equations based on both m... | [
{
"created": "Wed, 25 Aug 1999 12:26:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Miskovic",
"I.",
""
],
[
"Sijacki",
"Dj.",
""
]
] | A generalization of the Dirac field equation in three-dimensional Minkowski space-time to the case of the $\bar{SL}(3,R)$ $\subset$ $\bar{SA}(3,R)$ symmetry is considered. Constraints that ensure a correct physical interpretation of the corresponding particle states are presented. Dirac-like equations based on both mul... |
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