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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1204.5604 | Jaume Haro | Jaume de Haro | Future singularity avoidance in phantom dark energy models | Accepted for publication in JCAP | JCAP 04(07) 2012 | 10.1088/1475-7516/2012/07/007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Different approaches to quantum cosmology are studied in order to deal with
the future singularity avoidance problem. Our results show that these future
singularities will persist but could take different forms. As an example we
have studied the big rip which appear when one considers the state equation
$P=\omega\rho... | [
{
"created": "Wed, 25 Apr 2012 10:07:28 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Apr 2012 06:08:14 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Jun 2012 06:19:41 GMT",
"version": "v3"
}
] | 2014-09-05 | [
[
"de Haro",
"Jaume",
""
]
] | Different approaches to quantum cosmology are studied in order to deal with the future singularity avoidance problem. Our results show that these future singularities will persist but could take different forms. As an example we have studied the big rip which appear when one considers the state equation $P=\omega\rho$ ... |
1204.4499 | N\'estor Ortiz | N\'estor Ortiz and Olivier Sarbach | Conformal diagrams for the gravitational collapse of a spherically
symmetric dust cloud | 8 pages, 4 figures, prepared for the proceedings of the VIII Mexican
School of the Gravitational and Mathematical Physics Division of the Mexican
Physical Society | AIP Conf. Proc. 1256, 349 (2010) | 10.1063/1.3473876 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an algorithm for the construction of conformal coordinates in the
interior of a spherically symmetric, collapsing matter cloud in general
relativity. This algorithm is based on the numerical integration of radial null
geodesics. As an application we generate conformal diagrams for collapsing
spherical dust... | [
{
"created": "Thu, 19 Apr 2012 23:33:53 GMT",
"version": "v1"
}
] | 2012-04-23 | [
[
"Ortiz",
"Néstor",
""
],
[
"Sarbach",
"Olivier",
""
]
] | We present an algorithm for the construction of conformal coordinates in the interior of a spherically symmetric, collapsing matter cloud in general relativity. This algorithm is based on the numerical integration of radial null geodesics. As an application we generate conformal diagrams for collapsing spherical dust c... |
2007.13590 | Ion I. Cotaescu | Ion I. Cotaescu | Longitudinal Doppler effect in de Sitter expanding universe | 13 pages | null | 10.1142/S021773232150022X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new redshift formula is obtained considering the longitudinal Doppler
effect in the de Sitter expanding universe where the relative geodesic motion
is governed by the Lorenzian isometries of our new de Sitter relativity [I. I.
Cot\u aescu, {Eur. Phys. J. C} {\bf 77} (2017) 485]. This formula combines in a
non-trivi... | [
{
"created": "Mon, 27 Jul 2020 14:14:25 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jul 2020 05:45:00 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Oct 2020 13:57:37 GMT",
"version": "v3"
}
] | 2021-02-24 | [
[
"Cotaescu",
"Ion I.",
""
]
] | A new redshift formula is obtained considering the longitudinal Doppler effect in the de Sitter expanding universe where the relative geodesic motion is governed by the Lorenzian isometries of our new de Sitter relativity [I. I. Cot\u aescu, {Eur. Phys. J. C} {\bf 77} (2017) 485]. This formula combines in a non-trivial... |
2311.03397 | M.J. Luo | M.J.Luo | Local Short-Time Acceleration induced Spectral Line Broadening and
Possible Implications in Cosmology | 9 pages, 1 figure | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper proposes an acceleration effect that a local short-time
acceleration produces an additional broadening to spectral line, while the
central value of the line remains unaffected. The effect can be considered as a
local and non-uniform generalization of Unruh effect. Although the
acceleration-induced line broa... | [
{
"created": "Sun, 5 Nov 2023 09:04:00 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Mar 2024 06:53:48 GMT",
"version": "v2"
}
] | 2024-03-07 | [
[
"Luo",
"M. J.",
""
]
] | The paper proposes an acceleration effect that a local short-time acceleration produces an additional broadening to spectral line, while the central value of the line remains unaffected. The effect can be considered as a local and non-uniform generalization of Unruh effect. Although the acceleration-induced line broade... |
0806.4282 | Guillermo A. Gonzalez | Javier Ramos-Caro, Framsol Lopez-Suspes and Guillermo A. Gonzalez | Chaotic Motion Around Stellar Objects with Octupolar Deformation:
Newtonian and Post Newtonian Approaches | Submitted to PRD | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Regular and chaotic test particle motion in gravitational fields due to
stellar bodies with quadrupolar and octupolar deformation are studied using
Poincare surfaces of section. In first instance, we analyze the purely
Newtonian case and we find that the octupolar term induces a distortion in the
KAM curves correspon... | [
{
"created": "Thu, 26 Jun 2008 10:55:15 GMT",
"version": "v1"
}
] | 2008-06-27 | [
[
"Ramos-Caro",
"Javier",
""
],
[
"Lopez-Suspes",
"Framsol",
""
],
[
"Gonzalez",
"Guillermo A.",
""
]
] | Regular and chaotic test particle motion in gravitational fields due to stellar bodies with quadrupolar and octupolar deformation are studied using Poincare surfaces of section. In first instance, we analyze the purely Newtonian case and we find that the octupolar term induces a distortion in the KAM curves correspondi... |
1310.7894 | Nelson Posada-Aguirre | Nelson C. Posada-Aguirre and Davide Batic | Electrovac Universes with a Cosmological Constant | 7 pages | Cent. Eur. J. Phys. 12 (5), 297 (2014) | 10.2478/s11534-014-0458-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the extension of the Einstein-Maxwell system called electrovac
universes by introducing a cosmological constant $\Lambda$. In the absence of
the $\Lambda$ term, the crucial equation in solving the Einstein-Maxwell system
is the Laplace equation. The cosmological constant modifies this equation to
become in... | [
{
"created": "Tue, 29 Oct 2013 17:47:30 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Apr 2014 22:50:13 GMT",
"version": "v2"
},
{
"created": "Tue, 13 May 2014 15:59:04 GMT",
"version": "v3"
}
] | 2020-10-05 | [
[
"Posada-Aguirre",
"Nelson C.",
""
],
[
"Batic",
"Davide",
""
]
] | We present the extension of the Einstein-Maxwell system called electrovac universes by introducing a cosmological constant $\Lambda$. In the absence of the $\Lambda$ term, the crucial equation in solving the Einstein-Maxwell system is the Laplace equation. The cosmological constant modifies this equation to become in a... |
1205.4410 | Oleg Zaslavskii | O. B. Zaslavskii | Energetics of particle collisions near dirty rotating extremal black
holes: Banados-Silk-West effect versus Penrose process | 31 pages. Final version to appear in PRD | Phys. Rev. D 86, 084030 (2012) | 10.1103/PhysRevD.86.084030 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If two particles collide near the horizon of a rotating extremal black hole,
under certain conditions the energy E_{c.m.} in the center-of-mass frame can
grow without limit (the so-called Banados-Silk-West effect). We consider
collisions that produce two other particles. We show that for a generic dirty
(surrounded b... | [
{
"created": "Sun, 20 May 2012 12:13:42 GMT",
"version": "v1"
},
{
"created": "Sat, 14 Jul 2012 08:40:53 GMT",
"version": "v2"
},
{
"created": "Sun, 7 Oct 2012 11:55:54 GMT",
"version": "v3"
}
] | 2015-06-05 | [
[
"Zaslavskii",
"O. B.",
""
]
] | If two particles collide near the horizon of a rotating extremal black hole, under certain conditions the energy E_{c.m.} in the center-of-mass frame can grow without limit (the so-called Banados-Silk-West effect). We consider collisions that produce two other particles. We show that for a generic dirty (surrounded by ... |
1211.2685 | Ettore Minguzzi | E. Minguzzi | Causality of spacetimes admitting a parallel null vector and weak KAM
theory | 68 pages, 3 figures | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The causal spacetimes admitting a covariantly constant null vector provide a
connection between relativistic and non-relativistic physics. We explore this
relationship in several directions. We start proving a formula which relates
the Lorentzian distance in the full spacetime with the least action of a
mechanical sy... | [
{
"created": "Mon, 12 Nov 2012 16:31:12 GMT",
"version": "v1"
}
] | 2012-11-13 | [
[
"Minguzzi",
"E.",
""
]
] | The causal spacetimes admitting a covariantly constant null vector provide a connection between relativistic and non-relativistic physics. We explore this relationship in several directions. We start proving a formula which relates the Lorentzian distance in the full spacetime with the least action of a mechanical syst... |
gr-qc/0403015 | Sang Pyo Kim | Sang Pyo Kim (Kunsan Nat'l Univ.) | Quantum Cosmology for Tunneling Universes | RevTex4; invited talk at VI APCTP International Conference of
Gravitation and Astrophysics (ICGA6), Seoul, Oct. 6-9, 2003 | J.Korean Phys.Soc. 45 (2004) S172-S180 | null | null | gr-qc | null | In a quantum cosmological model consisting of a Euclidean region and a
Lorentzian region, Hartle-Hawking's no-bounary wave function, and Linde's wave
function and Vilenkin's tunneling wave function are briefly described and
compared with each other. We put a particular emphasis on semiclassical gravity
from quantum c... | [
{
"created": "Wed, 3 Mar 2004 00:06:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kim",
"Sang Pyo",
"",
"Kunsan Nat'l Univ."
]
] | In a quantum cosmological model consisting of a Euclidean region and a Lorentzian region, Hartle-Hawking's no-bounary wave function, and Linde's wave function and Vilenkin's tunneling wave function are briefly described and compared with each other. We put a particular emphasis on semiclassical gravity from quantum cos... |
1310.1491 | Meng-Sen Ma | Meng-Sen Ma, Ren Zhao | Phase transition and entropy spectrum of BTZ black hole in
three-dimensional gravity with torsion | 17 pages, 5 figures | Phys. Rev. D 89, 044005 (2014) | 10.1103/PhysRevD.89.044005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the phase transition and the entropy spectrum of BTZ
black hole obtained in a model of three-dimensional gravity with torsion. By
calculating the heat capacity we find that the BTZ black hole we considered
will experience phase transition at some critical point. This indicates that
the critica... | [
{
"created": "Sat, 5 Oct 2013 16:28:08 GMT",
"version": "v1"
}
] | 2014-02-12 | [
[
"Ma",
"Meng-Sen",
""
],
[
"Zhao",
"Ren",
""
]
] | In this paper, we study the phase transition and the entropy spectrum of BTZ black hole obtained in a model of three-dimensional gravity with torsion. By calculating the heat capacity we find that the BTZ black hole we considered will experience phase transition at some critical point. This indicates that the critical ... |
1710.00863 | Fethi M. Ramazanoglu | Fethi M Ramazano\u{g}lu | Regularization of instabilities in gravity theories | Updated version that reflects the changes in the published erratum.
Conclusions are the same, but some of the missing terms in the equations are
added. 6 pages | Phys. Rev. D 97, 024008 (2018) | 10.1103/PhysRevD.97.024008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate instabilities and their regularization in theories of
gravitation. Instabilities can be beneficial since their growth often leads to
prominent observable signatures which makes them especially relevant to
relatively low signal-to-noise ratio measurements such as gravitational wave
detections. An indefi... | [
{
"created": "Mon, 2 Oct 2017 18:42:24 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jan 2018 16:36:45 GMT",
"version": "v2"
},
{
"created": "Sat, 13 Apr 2019 14:25:21 GMT",
"version": "v3"
}
] | 2019-04-16 | [
[
"Ramazanoğlu",
"Fethi M",
""
]
] | We investigate instabilities and their regularization in theories of gravitation. Instabilities can be beneficial since their growth often leads to prominent observable signatures which makes them especially relevant to relatively low signal-to-noise ratio measurements such as gravitational wave detections. An indefini... |
2311.03399 | Alnadhief H. A. Alfedeel | Alnadhief H. A. Alfedeel, Maye Elmardi and Amare abebe | Perturbations in Bianchi Type-I spacetimes with varying Lambda, G | 12 pages, 6figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the evolution of cosmological perturbations
within the context of Bianchi Type$-I$ spacetimes. We consider models
containing viscous fluids with evolving cosmological (\LL) and Newtonian
gravitational (G) parameters. The investigation of how over-densities in the
viscous matter content i... | [
{
"created": "Sun, 5 Nov 2023 12:15:24 GMT",
"version": "v1"
}
] | 2023-11-08 | [
[
"Alfedeel",
"Alnadhief H. A.",
""
],
[
"Elmardi",
"Maye",
""
],
[
"abebe",
"Amare",
""
]
] | In this paper, we investigate the evolution of cosmological perturbations within the context of Bianchi Type$-I$ spacetimes. We consider models containing viscous fluids with evolving cosmological (\LL) and Newtonian gravitational (G) parameters. The investigation of how over-densities in the viscous matter content in ... |
gr-qc/0101100 | Vladimir V. Dyadichev | D.V. Gal'tsov | Quantization Near Violent Singularities in Einstein-Yang-Mills Black
Holes | 2 pages, Contribution to the 9th Marcel Grossmann meeting (MG9),
Rome, July 2000 | null | 10.1142/9789812777386_0251 | DTP-MSU-0019 | gr-qc | null | Classical singularities inside black holes in the Einstein-Yang-Mills theory
exhibit unusual features. Only for discrete values of the black hole mass one
encounters singularities of the Schwarzschild type (timelike) and the
Reissner-Nordstrom type (spacelike). For a generic mass the approach to
singularity is not sm... | [
{
"created": "Fri, 26 Jan 2001 12:08:08 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Gal'tsov",
"D. V.",
""
]
] | Classical singularities inside black holes in the Einstein-Yang-Mills theory exhibit unusual features. Only for discrete values of the black hole mass one encounters singularities of the Schwarzschild type (timelike) and the Reissner-Nordstrom type (spacelike). For a generic mass the approach to singularity is not smoo... |
2203.14608 | Victor Pozsgay | Victor Pozsgay | Cosmology of a new class of massive vector fields | 4 pages, 2 figures, Contribution to the 2022 Cosmology session of the
56th Rencontres de Moriond | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I introduce (Extended) Proca-Nuevo, a non-linear theory of a massive spin-1
field enjoying a non-linearly realized constraint. I will provide a
covariantization scheme that allows for consistent, ghost-free cosmological
solutions, describing the correct number of dynamical variables in the presence
of perfect fluid m... | [
{
"created": "Mon, 28 Mar 2022 09:38:51 GMT",
"version": "v1"
}
] | 2022-03-29 | [
[
"Pozsgay",
"Victor",
""
]
] | I introduce (Extended) Proca-Nuevo, a non-linear theory of a massive spin-1 field enjoying a non-linearly realized constraint. I will provide a covariantization scheme that allows for consistent, ghost-free cosmological solutions, describing the correct number of dynamical variables in the presence of perfect fluid mat... |
gr-qc/9907080 | Moshe Carmeli | Moshe Carmeli (Ben Gurion U.) | Aspects of Cosmological Relativity | 15 pages; invited talk at the Fourth Alexander Friedmann Seminar on
Gravitation and Cosmology; accepted for publication in Intern. J. Theor.
Phys., to appear July 1999 | Int.J.Theor.Phys. 38 (1999) 1993 | null | null | gr-qc astro-ph math-ph math.MP | null | We review cosmological relativity, a new special theory of relativity that
was recently developed for cosmology, and discuss in detail some of its
aspects.
| [
{
"created": "Sun, 25 Jul 1999 16:57:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Carmeli",
"Moshe",
"",
"Ben Gurion U."
]
] | We review cosmological relativity, a new special theory of relativity that was recently developed for cosmology, and discuss in detail some of its aspects. |
gr-qc/9507038 | Arlen Anderson | Arlen Anderson | Evolving Constants of Motion | LaTeX, 19 pp | null | null | IFP-UNC-95-511 | gr-qc | null | A critical presentation of Rovelli's ``evolving constants of motion'' is
given. Previous criticisms by Kucha\v{r} concerning the role of factor ordering
and the non-existence of observables are dealt with and shown to be unfounded.
Kucha\v{r}'s criticisms that this approach does not solve the global, multiple
choice ... | [
{
"created": "Tue, 18 Jul 1995 03:19:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Anderson",
"Arlen",
""
]
] | A critical presentation of Rovelli's ``evolving constants of motion'' is given. Previous criticisms by Kucha\v{r} concerning the role of factor ordering and the non-existence of observables are dealt with and shown to be unfounded. Kucha\v{r}'s criticisms that this approach does not solve the global, multiple choice or... |
1212.6740 | Cesar Arias H. | Cesar Arias, Rodrigo Aros and Nelson Zamorano | de Sitter Entropy from a lower dimensional black hole | Final version | Phys. Rev. D 88, 043003 (2013) | 10.1103/PhysRevD.88.043003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An alternative method to compute the entropy of de Sitter spacetime for
dimensions higher than or equal to five is presented. It is shown that de
Sitter entropy may be obtained from the Bekenstein-Hawking entropy of a
lower-dimensional black hole. This result follows from the existence of a
one-to-one correspondence ... | [
{
"created": "Sun, 30 Dec 2012 16:33:03 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Jan 2013 17:16:08 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Jun 2013 01:27:40 GMT",
"version": "v3"
},
{
"created": "Thu, 15 Aug 2013 07:16:20 GMT",
"version": "v4"
}
] | 2015-06-12 | [
[
"Arias",
"Cesar",
""
],
[
"Aros",
"Rodrigo",
""
],
[
"Zamorano",
"Nelson",
""
]
] | An alternative method to compute the entropy of de Sitter spacetime for dimensions higher than or equal to five is presented. It is shown that de Sitter entropy may be obtained from the Bekenstein-Hawking entropy of a lower-dimensional black hole. This result follows from the existence of a one-to-one correspondence be... |
1109.2012 | David Delphenich | D. H. Delphenich | On the topological nature of Volterra's theorem | 24 pages | null | null | null | gr-qc cond-mat.mtrl-sci math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is first observed that the original formulation of the Volterra
construction for dislocations and disclinations was related to the role that
homotopy plays in strain compatibility, whereas the modern discussions are
chiefly concerned with how it relates to the holonomy groups of connections
that have non-vanishing... | [
{
"created": "Fri, 9 Sep 2011 13:48:52 GMT",
"version": "v1"
}
] | 2011-09-12 | [
[
"Delphenich",
"D. H.",
""
]
] | It is first observed that the original formulation of the Volterra construction for dislocations and disclinations was related to the role that homotopy plays in strain compatibility, whereas the modern discussions are chiefly concerned with how it relates to the holonomy groups of connections that have non-vanishing t... |
gr-qc/0202024 | Robert Beig | Robert Beig, Bernd G. Schmidt | Static, Self-Gravitating Elastic Bodies | 8 pages | Proc.Roy.Soc.Lond. A459 (2003) 109-115 | 10.1098/rspa.2002.1031 | UWThPh-2002-5 | gr-qc | null | There is proved an existence theorem, in the Newtonian theory, for static,
self-gravitating bodies composed of elastic material. The theorem covers the
case where these bodies are small, but allows them to have arbitrary shape.
| [
{
"created": "Thu, 7 Feb 2002 13:27:22 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jul 2002 13:08:00 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Beig",
"Robert",
""
],
[
"Schmidt",
"Bernd G.",
""
]
] | There is proved an existence theorem, in the Newtonian theory, for static, self-gravitating bodies composed of elastic material. The theorem covers the case where these bodies are small, but allows them to have arbitrary shape. |
1904.04871 | Fil Simovic | Fil Simovic and Robert B. Mann | Critical Phenomena of Born-Infeld-de Sitter Black Holes in Cavities | 15 pages, 18 figures | null | 10.1007/JHEP05(2019)136 | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We examine the thermodynamic behaviour of charged, asymptotically de Sitter
black holes embedded in a finite-radius isothermal cavity, with a Born-Infeld
gauge field replacing the ordinary Maxwell field. We find that the
non-linearities of Born-Infeld theory lead to the presence of reentrant phase
transitions in the ... | [
{
"created": "Tue, 9 Apr 2019 19:05:02 GMT",
"version": "v1"
}
] | 2019-06-26 | [
[
"Simovic",
"Fil",
""
],
[
"Mann",
"Robert B.",
""
]
] | We examine the thermodynamic behaviour of charged, asymptotically de Sitter black holes embedded in a finite-radius isothermal cavity, with a Born-Infeld gauge field replacing the ordinary Maxwell field. We find that the non-linearities of Born-Infeld theory lead to the presence of reentrant phase transitions in the ca... |
1003.2926 | Irina Radinschi | I. Radinschi, Farook Rahaman and Asish Ghosh | On the energy of charged black holes in generalized dilaton-axion
gravity | LaTex | Int.J.Theor.Phys.49:943-956,2010 | 10.1007/s10773-010-0273-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we calculate the energy distribution of some charged black
holes in generalized dilaton-axion gravity. The solutions correspond to charged
black holes arising in a Kalb-Ramond-dilaton background and some existing
non-rotating black hole solutions are recovered in special cases. We focus our
study to asy... | [
{
"created": "Mon, 15 Mar 2010 14:26:17 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Radinschi",
"I.",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Ghosh",
"Asish",
""
]
] | In this paper we calculate the energy distribution of some charged black holes in generalized dilaton-axion gravity. The solutions correspond to charged black holes arising in a Kalb-Ramond-dilaton background and some existing non-rotating black hole solutions are recovered in special cases. We focus our study to asymp... |
gr-qc/0503057 | Rafael Sorkin | Rafael D. Sorkin | Big extra dimensions make Lambda too small | plainTeX, 9 pages, no figures To appear in a special issue of the
Brazilian Journal of Physics devoted to the Proceedings of the Second
International Workshop ``DICE 2004'' held September, 2004, Piombino, Italy.
MOST CURRENT VERSION available at
http://www.physics.syr.edu/~sorkin/some.papers/ or wherever my hom... | Braz.J.Phys. 35 (2005) 280-283 | 10.1590/S0103-97332005000200012 | null | gr-qc hep-ph hep-th | null | I argue that the true quantum gravity scale cannot be much larger than the
Planck length, because if it were then the quantum gravity-induced fluctuations
in $\Lam$ would be insufficient to produce the observed cosmic ``dark energy''.
If one accepts this argument, it rules out scenarios of the ``large extra
dimension... | [
{
"created": "Mon, 14 Mar 2005 03:07:42 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Sorkin",
"Rafael D.",
""
]
] | I argue that the true quantum gravity scale cannot be much larger than the Planck length, because if it were then the quantum gravity-induced fluctuations in $\Lam$ would be insufficient to produce the observed cosmic ``dark energy''. If one accepts this argument, it rules out scenarios of the ``large extra dimensions'... |
0903.5419 | Betti Hartmann | Yves Brihaye, Thierry Caebergs (Universite de Mons, Belgium), Betti
Hartmann and Momchil Minkov (Jacobs University Bremen, Germany) | Symmetry breaking in (gravitating) scalar field models describing
interacting boson stars and Q-balls | 33 pages including 21 figures; v2: version considerably extended: 6
new figures added, equations of motion added, discussion on varying
gravitational coupling added, references added | Phys.Rev.D80:064014,2009 | 10.1103/PhysRevD.80.064014 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the properties of interacting Q-balls and boson stars that sit
on top of each other in great detail. The model that describes these solutions
is essentially a (gravitating) two-scalar field model where both scalar fields
are complex. We construct interacting Q-balls or boson stars with arbitrarily
smal... | [
{
"created": "Tue, 31 Mar 2009 09:48:06 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 2009 08:48:20 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Brihaye",
"Yves",
"",
"Universite de Mons, Belgium"
],
[
"Caebergs",
"Thierry",
"",
"Universite de Mons, Belgium"
],
[
"Hartmann",
"Betti",
"",
"Jacobs University Bremen, Germany"
],
[
"Minkov",
"Momchil",
"",
"Jacobs University Bremen, ... | We investigate the properties of interacting Q-balls and boson stars that sit on top of each other in great detail. The model that describes these solutions is essentially a (gravitating) two-scalar field model where both scalar fields are complex. We construct interacting Q-balls or boson stars with arbitrarily small ... |
gr-qc/0111103 | Mikhail Vysotsky | S.I. Blinnikov, L.B. Okun, M.I. Vysotsky (ITEP, Moscow, Russia) | Relativity and c/sqrt{3} | 6 pages; PS with an essential reference added. Contribution to Holger
Nielsen festschrift | null | null | null | gr-qc astro-ph physics.class-ph | null | We define the critical coordinate velocity v_c. A particle moving radially in
Schwarzschild background with this velocity, v_c= c/sqrt 3, is neither
accelerated, nor decelerated if gravitational field is weak, r_g << r, where
r_g is the gravitational radius, while r is the current one.
We find that the numerical co... | [
{
"created": "Thu, 29 Nov 2001 12:19:30 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Dec 2001 10:21:32 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Blinnikov",
"S. I.",
"",
"ITEP, Moscow, Russia"
],
[
"Okun",
"L. B.",
"",
"ITEP, Moscow, Russia"
],
[
"Vysotsky",
"M. I.",
"",
"ITEP, Moscow, Russia"
]
] | We define the critical coordinate velocity v_c. A particle moving radially in Schwarzschild background with this velocity, v_c= c/sqrt 3, is neither accelerated, nor decelerated if gravitational field is weak, r_g << r, where r_g is the gravitational radius, while r is the current one. We find that the numerical coinci... |
1103.2475 | Abhay Ashtekar | Abhay Ashtekar and David Sloan | Probability of Inflation in Loop Quantum Cosmology | 34 pages, 3 figures | Gen. Rel. Grav. 43, 3619-3656 (2011) | 10.1007/s10714-011-1246-y | IGC-11/03-02 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inflationary models of the early universe provide a natural mechanism for the
formation of large scale structure. This success brings to forefront the
question of naturalness: Does a sufficiently long slow roll inflation occur
generically or does it require a careful fine tuning of initial parameters? In
recent years... | [
{
"created": "Sat, 12 Mar 2011 20:40:02 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Sloan",
"David",
""
]
] | Inflationary models of the early universe provide a natural mechanism for the formation of large scale structure. This success brings to forefront the question of naturalness: Does a sufficiently long slow roll inflation occur generically or does it require a careful fine tuning of initial parameters? In recent years t... |
gr-qc/0609040 | Winston Fairbairn | Winston Fairbairn (CPT) | Fermions in three-dimensional spinfoam quantum gravity | 40 pages, 3 figures, version accepted for publication in GERG | Gen.Rel.Grav.39:427-476,2007 | 10.1007/s10714-006-0395-x | null | gr-qc | null | We study the coupling of massive fermions to the quantum mechanical dynamics
of spacetime emerging from the spinfoam approach in three dimensions. We first
recall the classical theory before constructing a spinfoam model of quantum
gravity coupled to spinors. The technique used is based on a finite expansion
in inver... | [
{
"created": "Tue, 12 Sep 2006 12:15:59 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Dec 2006 21:14:24 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Fairbairn",
"Winston",
"",
"CPT"
]
] | We study the coupling of massive fermions to the quantum mechanical dynamics of spacetime emerging from the spinfoam approach in three dimensions. We first recall the classical theory before constructing a spinfoam model of quantum gravity coupled to spinors. The technique used is based on a finite expansion in inverse... |
1311.1751 | Arman Tursunov | Arman Tursunov, Martin Kolo\v{s}, Ahmadjon Abdujabbarov, Bobomurat
Ahmedov and Zden\v{e}k Stuchl\'ik | Acceleration of particles in spacetimes of black string | 20 pages, 20 figures, 2 tables | Phys. Rev. D 88, 124001 (2013) | 10.1103/PhysRevD.88.124001 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The particle acceleration mechanism in $S^2 \times\mathbb{R}^1$ topology,
namely in the spacetime of the five-dimensional compact black string has been
studied. The expression of center-of-mass energy of the colliding neutral
particles near static black string has been found. The collision of charged
particle moving ... | [
{
"created": "Thu, 7 Nov 2013 17:15:38 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Nov 2013 19:09:18 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Dec 2013 14:00:57 GMT",
"version": "v3"
}
] | 2014-10-22 | [
[
"Tursunov",
"Arman",
""
],
[
"Kološ",
"Martin",
""
],
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Ahmedov",
"Bobomurat",
""
],
[
"Stuchlík",
"Zdeněk",
""
]
] | The particle acceleration mechanism in $S^2 \times\mathbb{R}^1$ topology, namely in the spacetime of the five-dimensional compact black string has been studied. The expression of center-of-mass energy of the colliding neutral particles near static black string has been found. The collision of charged particle moving at... |
2011.07037 | Daniela Saadeh | Jonathan Braden, Clare Burrage, Benjamin Elder, Daniela Saadeh | $\varphi$enics: Vainshtein screening with the finite element method | 47 pages, 15 figures, v2: minor modifications to match version
accepted by JCAP | JCAP 03 (2021) 010 | 10.1088/1475-7516/2021/03/010 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the landscape of modified theories of gravity, progress in
understanding the behaviour of, and developing tests for, screening mechanisms
has been hindered by the complexity of the field equations involved, which are
nonlinear in nature and characterised by a large hierarchy of scales. This is
especially true ... | [
{
"created": "Fri, 13 Nov 2020 17:57:32 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Mar 2021 00:09:25 GMT",
"version": "v2"
}
] | 2021-03-31 | [
[
"Braden",
"Jonathan",
""
],
[
"Burrage",
"Clare",
""
],
[
"Elder",
"Benjamin",
""
],
[
"Saadeh",
"Daniela",
""
]
] | Within the landscape of modified theories of gravity, progress in understanding the behaviour of, and developing tests for, screening mechanisms has been hindered by the complexity of the field equations involved, which are nonlinear in nature and characterised by a large hierarchy of scales. This is especially true of... |
1103.2890 | Bijan Saha Dr. | Bijan Saha | Nonlinear Spinor Fields and its role in Cosmology | 22 pages, 12 Figures | Int. J. Theor. Phys., 51 (2012) 1812 - 1837 | 10.1007/s10773-011-1059-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Different characteristic of matter influencing the evolution of the Universe
has been simulated by means of a nonlinear spinor field. Exploiting the spinor
description of perfect fluid and dark energy evolution of the Universe given by
an anisotropic Bianchi type-VI, VI$_0$, V, III, I or isotropic
Friedmann-Robertson... | [
{
"created": "Tue, 15 Mar 2011 12:08:58 GMT",
"version": "v1"
}
] | 2015-05-01 | [
[
"Saha",
"Bijan",
""
]
] | Different characteristic of matter influencing the evolution of the Universe has been simulated by means of a nonlinear spinor field. Exploiting the spinor description of perfect fluid and dark energy evolution of the Universe given by an anisotropic Bianchi type-VI, VI$_0$, V, III, I or isotropic Friedmann-Robertson-W... |
gr-qc/9511023 | Jorma Louko | Jorma Louko and Rafael D. Sorkin | Complex actions in two-dimensional topology change | 34 pages, REVTeX v3.0. (Presentational reorganization; core results
unchanged.) | Class.Quant.Grav. 14 (1997) 179-204 | 10.1088/0264-9381/14/1/018 | SU-GP-95-5-1, WISC-MILW-95-TH-16, PP96-40 | gr-qc hep-th | null | We investigate topology change in (1+1) dimensions by analyzing the
scalar-curvature action $1/2 \int R dV$ at the points of metric-degeneration
that (with minor exceptions) any nontrivial Lorentzian cobordism necessarily
possesses. In two dimensions any cobordism can be built up as a combination of
only two elementa... | [
{
"created": "Mon, 6 Nov 1995 23:30:22 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Nov 1995 22:46:58 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Jan 1997 16:39:14 GMT",
"version": "v3"
}
] | 2009-10-28 | [
[
"Louko",
"Jorma",
""
],
[
"Sorkin",
"Rafael D.",
""
]
] | We investigate topology change in (1+1) dimensions by analyzing the scalar-curvature action $1/2 \int R dV$ at the points of metric-degeneration that (with minor exceptions) any nontrivial Lorentzian cobordism necessarily possesses. In two dimensions any cobordism can be built up as a combination of only two elementary... |
2207.05355 | Timothy Budd | Timothy Budd, Alicia Castro | Scale-invariant random geometry from mating of trees: a numerical study | 28 pages, 16 figures | null | 10.1103/PhysRevD.107.026010 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The search for scale-invariant random geometries is central to the Asymptotic
Safety hypothesis for the Euclidean path integral in quantum gravity. In an
attempt to uncover new universality classes of scale-invariant random
geometries that go beyond surface topology, we explore a generalization of the
mating of trees... | [
{
"created": "Tue, 12 Jul 2022 07:40:52 GMT",
"version": "v1"
}
] | 2023-01-25 | [
[
"Budd",
"Timothy",
""
],
[
"Castro",
"Alicia",
""
]
] | The search for scale-invariant random geometries is central to the Asymptotic Safety hypothesis for the Euclidean path integral in quantum gravity. In an attempt to uncover new universality classes of scale-invariant random geometries that go beyond surface topology, we explore a generalization of the mating of trees a... |
gr-qc/0305016 | Pantelis S. Apostolopoulos | Pantelis S. Apostolopoulos and Michael Tsamparlis | Note on Matter Collineations in Kantowski-Sachs, Bianchi Types I and III
Spacetimes | 10 pages, Latex. Accepted for publication in General Relativity and
Gravitation | Gen.Rel.Grav. 35 (2003) 1869-1876 | 10.1023/A:1026026517034 | null | gr-qc | null | We show that the classification of Kantowski-Sachs, Bianchi Types I and III
spacetimes admitting Matter Collineations (MCs) presented in a recent paper by
Camci et al. [Camci, U., and Sharif, M. {Matter Collineations in
Kantowski-Sachs, Bianchi Types I and III Spacetimes}, 2003 Gen. Relativ. Grav.
vol. 35, 97-109] is... | [
{
"created": "Sun, 4 May 2003 16:23:19 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Apostolopoulos",
"Pantelis S.",
""
],
[
"Tsamparlis",
"Michael",
""
]
] | We show that the classification of Kantowski-Sachs, Bianchi Types I and III spacetimes admitting Matter Collineations (MCs) presented in a recent paper by Camci et al. [Camci, U., and Sharif, M. {Matter Collineations in Kantowski-Sachs, Bianchi Types I and III Spacetimes}, 2003 Gen. Relativ. Grav. vol. 35, 97-109] is i... |
1607.04353 | Dongfeng Gao | Dongfeng Gao and Mingsheng Zhan | Constraining the generalized uncertainty principle with cold atoms | null | Phys. Rev. A 94, 013607 (2016) | 10.1103/PhysRevA.94.013607 | null | gr-qc physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Various theories of quantum gravity predict the existence of a minimum length
scale, which implies the Planck-scale modifications of the Heisenberg
uncertainty principle to a so-called generalized uncertainty principle (GUP).
Previous studies of the GUP focused on its implications for high-energy
physics, cosmology, ... | [
{
"created": "Fri, 15 Jul 2016 01:17:58 GMT",
"version": "v1"
}
] | 2017-04-28 | [
[
"Gao",
"Dongfeng",
""
],
[
"Zhan",
"Mingsheng",
""
]
] | Various theories of quantum gravity predict the existence of a minimum length scale, which implies the Planck-scale modifications of the Heisenberg uncertainty principle to a so-called generalized uncertainty principle (GUP). Previous studies of the GUP focused on its implications for high-energy physics, cosmology, an... |
gr-qc/0102100 | Nils Andersson | K Glampedakis and N Andersson | Scattering of scalar waves by rotating black holes | Revtex, 15 eps figures | Class.Quant.Grav. 18 (2001) 1939-1966 | 10.1088/0264-9381/18/10/309 | null | gr-qc | null | We study the scattering of massless scalar waves by a Kerr black hole by
letting plane monochromatic waves impinge on the black hole. We calculate the
relevant scattering phase-shifts using the
Pruefer phase-function method, which is computationally efficient and
reliable also for high frequencies and/or large valu... | [
{
"created": "Thu, 22 Feb 2001 16:25:46 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Glampedakis",
"K",
""
],
[
"Andersson",
"N",
""
]
] | We study the scattering of massless scalar waves by a Kerr black hole by letting plane monochromatic waves impinge on the black hole. We calculate the relevant scattering phase-shifts using the Pruefer phase-function method, which is computationally efficient and reliable also for high frequencies and/or large values o... |
1704.03251 | Shinya Tomizawa | Takashi Mishima, Shinya Tomizawa | Construction and application of variations on the cylindrical
gravitational waves of Weber, Wheeler, and Bonnor | 33 pages, 15 figures, the figures have been displayed, to be
published for Phys.Rev.D | Phys. Rev. D 96, 024023 (2017) | 10.1103/PhysRevD.96.024023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To clarify certain nonlinear properties of strong gravitational field, we
investigate cylindrically symmetric gravitational waves that are localized as
regular wave packets in the space of radial and time coordinates. The waves are
constructed by applying a certain kind of harmonic mapping method to the seed
solution... | [
{
"created": "Tue, 11 Apr 2017 11:52:06 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Apr 2017 10:45:17 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Apr 2017 07:00:03 GMT",
"version": "v3"
},
{
"created": "Thu, 29 Jun 2017 01:51:34 GMT",
"version": "v4"
}
] | 2017-07-19 | [
[
"Mishima",
"Takashi",
""
],
[
"Tomizawa",
"Shinya",
""
]
] | To clarify certain nonlinear properties of strong gravitational field, we investigate cylindrically symmetric gravitational waves that are localized as regular wave packets in the space of radial and time coordinates. The waves are constructed by applying a certain kind of harmonic mapping method to the seed solutions ... |
1509.03830 | Krzysztof Urbanowski | K. Urbanowski | Multiverse as an ensemble of stable and unstable Universes | LaTeX2e, 31 pages, 2 figures, new comments and references added | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Estimates of the Higgs and top quark masses, $m_{H} \simeq 125.10 \pm 0.14$
[GeV] and $m_{t} \simeq 172.76 \pm 0.30$ [GeV] based on the experimental
results place the Standard Model in the region of the metastable vacuum. A
consequence of the metastability of the Higgs vacuum is that it should induce
the decay of the... | [
{
"created": "Sun, 13 Sep 2015 09:44:40 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Feb 2023 17:23:07 GMT",
"version": "v2"
}
] | 2023-02-06 | [
[
"Urbanowski",
"K.",
""
]
] | Estimates of the Higgs and top quark masses, $m_{H} \simeq 125.10 \pm 0.14$ [GeV] and $m_{t} \simeq 172.76 \pm 0.30$ [GeV] based on the experimental results place the Standard Model in the region of the metastable vacuum. A consequence of the metastability of the Higgs vacuum is that it should induce the decay of the e... |
1306.4792 | Kuantay Boshkayev | Donato Bini, Kuantay Boshkayev, Remo Ruffini, and Ivan Siutsou | Equatorial Circular Geodesics in the Hartle-Thorne Spacetime | 6 pages, 8 figures, published in the proceedings of the 12th
Italian-Korean Sympothium on Relativistic Astrophysics | Il Nuovo Cimento vol. 36 C, N. 1 Suppl. 1, 2013 | 10.1393/ncc/i2013-11483-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the influence of the quadrupole moment of a rotating source on
the motion of a test particle in the strong field regime. For this purpose the
Hartle-Thorne metric, that is an approximate solution of vacuum Einstein field
equations that describes the exterior of any slowly rotating, stationary and
axial... | [
{
"created": "Thu, 20 Jun 2013 09:00:34 GMT",
"version": "v1"
}
] | 2013-06-21 | [
[
"Bini",
"Donato",
""
],
[
"Boshkayev",
"Kuantay",
""
],
[
"Ruffini",
"Remo",
""
],
[
"Siutsou",
"Ivan",
""
]
] | We investigate the influence of the quadrupole moment of a rotating source on the motion of a test particle in the strong field regime. For this purpose the Hartle-Thorne metric, that is an approximate solution of vacuum Einstein field equations that describes the exterior of any slowly rotating, stationary and axially... |
gr-qc/0611150 | Francisco Lobo | Francisco S. N. Lobo | Traversable wormholes supported by cosmic accelerated expanding
equations of state | 3 pages, contribution to the proceedings of MG11, Berlin, 23-29 July,
2006; based on an invited talk in the parallel session GT5, Wormholes, Energy
Conditions and Time Machines | null | null | null | gr-qc | null | We explore the possibility that traversable wormholes be supported by
specific equations of state responsible for the present accelerated expansion
of the Universe, namely, phantom energy, the generalized Chaplygin gas, and the
van der Waals quintessence equation of state.
| [
{
"created": "Wed, 29 Nov 2006 10:09:54 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lobo",
"Francisco S. N.",
""
]
] | We explore the possibility that traversable wormholes be supported by specific equations of state responsible for the present accelerated expansion of the Universe, namely, phantom energy, the generalized Chaplygin gas, and the van der Waals quintessence equation of state. |
gr-qc/0502104 | Choquet-Bruhat | Y. Choquet-Bruhat, J. Isenberg, and V. Moncrief | Topologically general U(1) symmetric Einstein spacetimes with AVTD
behavior | proceedings of conference in Elba to appear in Nuovo Cimento | Nuovo Cim.B119:625-638,2004 | 10.1393/ncb/i2004-10174-x | null | gr-qc | null | We use Fuchsian methods to show that, for any two dimensional manifold
$\Sigma^2$, there is a large family of U(1) symmetric solutions of the vacuum
Einstein equations on the manifold $\Sigma \times S^1 \times \mathbb{R}$, each
of which has AVTD behavior in the neighborhood of its singularity.
| [
{
"created": "Thu, 24 Feb 2005 17:16:50 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Choquet-Bruhat",
"Y.",
""
],
[
"Isenberg",
"J.",
""
],
[
"Moncrief",
"V.",
""
]
] | We use Fuchsian methods to show that, for any two dimensional manifold $\Sigma^2$, there is a large family of U(1) symmetric solutions of the vacuum Einstein equations on the manifold $\Sigma \times S^1 \times \mathbb{R}$, each of which has AVTD behavior in the neighborhood of its singularity. |
1910.12071 | Polina Petryakova | P. M. Petryakova, S. G. Rubin | Local temperature distribution in the vicinity of gravitationally bound
objects in the expanding Universe | null | Physics of Atomic Nuclei 84, 2021 | 10.1134/S1063778821090271 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We consider a cluster of Primordial Black Holes which is decoupled from the
cosmological expansion (Hubble flow) and this region is heated as compared to
the surrounding matter. The increased temperature inside the region can be
explained by several mechanisms of Primordial Black Holes formation. We study
the tempera... | [
{
"created": "Sat, 26 Oct 2019 14:23:49 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Feb 2022 12:12:27 GMT",
"version": "v2"
}
] | 2022-04-08 | [
[
"Petryakova",
"P. M.",
""
],
[
"Rubin",
"S. G.",
""
]
] | We consider a cluster of Primordial Black Holes which is decoupled from the cosmological expansion (Hubble flow) and this region is heated as compared to the surrounding matter. The increased temperature inside the region can be explained by several mechanisms of Primordial Black Holes formation. We study the temperatu... |
2005.06271 | Hooman Moradpour | H. Moradpour, A. H. Ziaie, M. Kord Zangeneh | Generalized entropies and corresponding holographic dark energy models | null | EPJC (2020) | 10.1140/epjc/s10052-020-8307-x | 80,732 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using Tsallis statistics and its relation with Boltzmann entropy, the Tsallis
entropy content of black holes is achieved, a result in full agreement with a
recent study (Phys. Lett. B 794, 24 (2019)). In addition, employing Kaniadakis
statistics and its relation with that of Tsallis, the Kaniadakis entropy of
black h... | [
{
"created": "Tue, 12 May 2020 07:33:39 GMT",
"version": "v1"
}
] | 2020-08-18 | [
[
"Moradpour",
"H.",
""
],
[
"Ziaie",
"A. H.",
""
],
[
"Zangeneh",
"M. Kord",
""
]
] | Using Tsallis statistics and its relation with Boltzmann entropy, the Tsallis entropy content of black holes is achieved, a result in full agreement with a recent study (Phys. Lett. B 794, 24 (2019)). In addition, employing Kaniadakis statistics and its relation with that of Tsallis, the Kaniadakis entropy of black hol... |
2109.09638 | Ding Jia | Ding Jia | Time-space duality in 2D quantum gravity | matches well published version | Class. Quantum Grav. 39, 035016 (2022) | 10.1088/1361-6382/ac4615 | null | gr-qc hep-lat hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An important task faced by all approaches of quantum gravity is to
incorporate superpositions and quantify quantum uncertainties of spacetime
causal relations. We address this task in 2D. By identifying a global $Z_2$
symmetry of 1+1D quantum gravity, we show that gravitational path integral
configurations come in eq... | [
{
"created": "Mon, 20 Sep 2021 15:45:48 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2022 21:03:09 GMT",
"version": "v2"
}
] | 2022-03-03 | [
[
"Jia",
"Ding",
""
]
] | An important task faced by all approaches of quantum gravity is to incorporate superpositions and quantify quantum uncertainties of spacetime causal relations. We address this task in 2D. By identifying a global $Z_2$ symmetry of 1+1D quantum gravity, we show that gravitational path integral configurations come in equa... |
gr-qc/0310124 | James Shifflett | J. A. Shifflett | Einstein-Schrodinger theory in the presence of zero-point fluctuations | 33 pages, latex2e, many changes, changed to geometrized units | null | null | null | gr-qc | null | The Einstein-Schrodinger theory is modified by adding a cosmological constant
contribution caused by zero-point fluctuations. This cosmological constant
which multiplies the symmetric metric is assumed to be nearly cancelled by
Schrodinger's ``bare'' cosmological constant which multiplies the nonsymmetric
fundamental... | [
{
"created": "Wed, 29 Oct 2003 23:21:08 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Oct 2003 14:20:10 GMT",
"version": "v2"
},
{
"created": "Sun, 2 Nov 2003 00:38:55 GMT",
"version": "v3"
},
{
"created": "Mon, 17 Nov 2003 15:17:50 GMT",
"version": "v4"
},
{
"cr... | 2007-05-23 | [
[
"Shifflett",
"J. A.",
""
]
] | The Einstein-Schrodinger theory is modified by adding a cosmological constant contribution caused by zero-point fluctuations. This cosmological constant which multiplies the symmetric metric is assumed to be nearly cancelled by Schrodinger's ``bare'' cosmological constant which multiplies the nonsymmetric fundamental t... |
1210.6889 | Ivan Booth | Ivan Booth, David Wenjie Tian | Some spacetimes containing non-rotating extremal isolated horizons | 15 pages, 1 figure. V2: significant revision with compression and
(hopefully) clarification of presentation, one appendix removed. Ultimate
results are unchanged | Class.Quant.Grav. 30 (2013) 145008 | 10.1088/0264-9381/30/14/145008 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Well-known results demonstrate the uniqueness of extremal isolated horizons
(equivalently near-horizon spacetimes) in (3+1)-dimensions. This paper briefly
reviews some of these results and then explicitly constructs families of
non-asymptotically flat, non-spherically symmetric spacetimes that nevertheless
contain sp... | [
{
"created": "Thu, 25 Oct 2012 16:10:40 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Apr 2013 14:27:31 GMT",
"version": "v2"
}
] | 2013-12-12 | [
[
"Booth",
"Ivan",
""
],
[
"Tian",
"David Wenjie",
""
]
] | Well-known results demonstrate the uniqueness of extremal isolated horizons (equivalently near-horizon spacetimes) in (3+1)-dimensions. This paper briefly reviews some of these results and then explicitly constructs families of non-asymptotically flat, non-spherically symmetric spacetimes that nevertheless contain sphe... |
0711.1790 | J. Fernando Barbero G. | J. Fernando Barbero G., Daniel G\'omez Vergel, Eduardo J. S.
Villase\~nor | Quantum unitary evolution of linearly polarized S^1\times S^2 and S^3
Gowdy models coupled to massless scalar fields | Final version to appear in Classical and Quantum Gravity | Class.Quant.Grav.25:085002,2008 | 10.1088/0264-9381/25/8/085002 | null | gr-qc | null | The purpose of this paper is to study in detail the problem of defining
unitary evolution for linearly polarized S^1 x S^2 and S^3 Gowdy models (in
vacuum or coupled to massless scalar fields). We show that in the Fock
quantizations of these systems no choice of acceptable complex structure leads
to a unitary evoluti... | [
{
"created": "Mon, 12 Nov 2007 14:51:19 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2008 18:48:54 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"G.",
"J. Fernando Barbero",
""
],
[
"Vergel",
"Daniel Gómez",
""
],
[
"Villaseñor",
"Eduardo J. S.",
""
]
] | The purpose of this paper is to study in detail the problem of defining unitary evolution for linearly polarized S^1 x S^2 and S^3 Gowdy models (in vacuum or coupled to massless scalar fields). We show that in the Fock quantizations of these systems no choice of acceptable complex structure leads to a unitary evolution... |
1001.0066 | Xin Li | Xin Li, Zhe Chang and Minghua Li | A matter dominated navigation Universe in accordance with the Type Ia
supernova data | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | We investigate a matter dominated navigation cosmological model. The
influence of a possible drift (wind) in the navigation cosmological model makes
the spacetime geometry change from Riemannian to Finslerian. The evolution of
the Finslerian Universe is governed by the same gravitational field equation
with the famil... | [
{
"created": "Thu, 31 Dec 2009 02:23:04 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Apr 2010 10:56:01 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Li",
"Xin",
""
],
[
"Chang",
"Zhe",
""
],
[
"Li",
"Minghua",
""
]
] | We investigate a matter dominated navigation cosmological model. The influence of a possible drift (wind) in the navigation cosmological model makes the spacetime geometry change from Riemannian to Finslerian. The evolution of the Finslerian Universe is governed by the same gravitational field equation with the familia... |
1803.02351 | Simone Dresti | Laura Covi and Simone Dresti | Time-dependent Features in the Primordial Spectrum | 31 pages, 13 figures. Typos, estimates and normalization of plots
corrected. Conclusions mostly unchanged | null | null | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a Quantum Field Theory with a time-dependent background,
time-translational symmetry is broken. We therefore expect time-dependent loop
corrections to cosmological observables after renormalization for an
interacting field, with the consequent physical implications. In this paper we
compute and discuss such radiat... | [
{
"created": "Tue, 6 Mar 2018 14:08:01 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Mar 2018 13:39:47 GMT",
"version": "v2"
}
] | 2018-03-21 | [
[
"Covi",
"Laura",
""
],
[
"Dresti",
"Simone",
""
]
] | In a Quantum Field Theory with a time-dependent background, time-translational symmetry is broken. We therefore expect time-dependent loop corrections to cosmological observables after renormalization for an interacting field, with the consequent physical implications. In this paper we compute and discuss such radiativ... |
gr-qc/0406074 | Alex Calogeracos | Alex Calogeracos | A detailed recalculation of the spectrum of radiation emitted during
gravitational collapse of a spherically symmetric star | 3 figures | null | null | null | gr-qc | null | We address the question of radiation emitted from a collapsing star. We
consider the simple model of a spherical star consisting of pressure-free dust
and we derive the emission spectrum via a systematic asymptotic expansion of
the complete Bogolubov amplitude. We present a review of standard features of
the problem ... | [
{
"created": "Fri, 18 Jun 2004 16:39:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Calogeracos",
"Alex",
""
]
] | We address the question of radiation emitted from a collapsing star. We consider the simple model of a spherical star consisting of pressure-free dust and we derive the emission spectrum via a systematic asymptotic expansion of the complete Bogolubov amplitude. We present a review of standard features of the problem an... |
2002.04541 | Yigit Yargic | Yigit Yargic, Marc Geiller | Modular polymer representations of the Weyl algebra | 33 pages | null | null | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the key conceptual challenges in quantum gravity is to understand how
quantum theory should modify the very notion of spacetime. One way to
investigate this question is to study the alternatives to Schr\"odinger quantum
mechanics. The polymer representation, inspired by loop quantum gravity, can be
understood ... | [
{
"created": "Tue, 11 Feb 2020 16:49:34 GMT",
"version": "v1"
}
] | 2020-02-12 | [
[
"Yargic",
"Yigit",
""
],
[
"Geiller",
"Marc",
""
]
] | One of the key conceptual challenges in quantum gravity is to understand how quantum theory should modify the very notion of spacetime. One way to investigate this question is to study the alternatives to Schr\"odinger quantum mechanics. The polymer representation, inspired by loop quantum gravity, can be understood as... |
gr-qc/0012105 | Alberto Saa | A. Saa, E. Gunzig, L. Brenig, V. Faraoni, T.M. Rocha Filho, and A.
Figueiredo | Superinflation, quintessence, and the avoidance of the initial
singularity | RevTex, 10 pages, 4 figures, To appear in the proceedings of the 5th
Peyresq meeting | Int.J.Theor.Phys. 40 (2001) 2295 | null | null | gr-qc | null | We consider the dynamics of a spatially flat universe dominated by a
self-interacting nonminimally coupled scalar field. The structure of the phase
space and complete phase portraits for the conformal coupling case are given.
It is shown that the non-minimal coupling modifies drastically the dynamics of
the universe.... | [
{
"created": "Thu, 28 Dec 2000 16:57:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Saa",
"A.",
""
],
[
"Gunzig",
"E.",
""
],
[
"Brenig",
"L.",
""
],
[
"Faraoni",
"V.",
""
],
[
"Filho",
"T. M. Rocha",
""
],
[
"Figueiredo",
"A.",
""
]
] | We consider the dynamics of a spatially flat universe dominated by a self-interacting nonminimally coupled scalar field. The structure of the phase space and complete phase portraits for the conformal coupling case are given. It is shown that the non-minimal coupling modifies drastically the dynamics of the universe. N... |
gr-qc/0307068 | Hiroyuki Tashiro | Hiroyuki Tashiro, Takeshi Chiba, Misao Sasaki | Reheating After Quintessential Inflation and Gravitational Waves | 15 pages, 5 figures, to be published in CQG | Class.Quant.Grav.21:1761-1772,2004 | 10.1088/0264-9381/21/7/004 | null | gr-qc astro-ph | null | We investigate the dependence of the gravitational wave spectrum from
quintessential inflation on the reheating process. We consider two extreme
reheating processes. One is the gravitational reheating by particle creation in
the expanding universe in which the beginning of the radiation dominated epoch
is delayed due... | [
{
"created": "Tue, 15 Jul 2003 14:03:57 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Feb 2004 05:26:56 GMT",
"version": "v2"
}
] | 2009-10-09 | [
[
"Tashiro",
"Hiroyuki",
""
],
[
"Chiba",
"Takeshi",
""
],
[
"Sasaki",
"Misao",
""
]
] | We investigate the dependence of the gravitational wave spectrum from quintessential inflation on the reheating process. We consider two extreme reheating processes. One is the gravitational reheating by particle creation in the expanding universe in which the beginning of the radiation dominated epoch is delayed due t... |
1912.12650 | Samad Khakshournia | S. Khakshournia and R. Mansouri | On the stress-energy tensor of a null shell in Einstein-Cartan gravity | 7 pages | Class. Quant. Grav. 36 (2019) 227001 | 10.1088/1361-6382/ab47d4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stress-energy tensor of a matter shell whose history coincides with a
null hypersurface in the Einstein-Cartan gravity is revisited. It is
demonstrated that with a proper choice for the torsion discontinuity taken to
be orthogonal to the null hypersurface and consistent with the antisymmetric
property of torsion ... | [
{
"created": "Sun, 29 Dec 2019 13:44:14 GMT",
"version": "v1"
}
] | 2020-01-08 | [
[
"Khakshournia",
"S.",
""
],
[
"Mansouri",
"R.",
""
]
] | The stress-energy tensor of a matter shell whose history coincides with a null hypersurface in the Einstein-Cartan gravity is revisited. It is demonstrated that with a proper choice for the torsion discontinuity taken to be orthogonal to the null hypersurface and consistent with the antisymmetric property of torsion te... |
1604.06279 | Chung-Ming Ko | Chung-Ming Ko | On the problem of deformed spherical systems in Modified Newtonian
Dynamics | 30 pages, 2 figures | Astrophysical Journal, 821, 111 (12pp), 2016 April 20 | 10.3847/0004-637X/821/2/111 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on Newtonian dynamics, observations show that the luminous masses of
astrophysical objects that are the size of a galaxy or larger are not enough to
generate the measured motions which they supposedly determine. This is
typically attributed to the existence of dark matter, which possesses mass but
does not radi... | [
{
"created": "Wed, 20 Apr 2016 11:17:39 GMT",
"version": "v1"
}
] | 2016-04-22 | [
[
"Ko",
"Chung-Ming",
""
]
] | Based on Newtonian dynamics, observations show that the luminous masses of astrophysical objects that are the size of a galaxy or larger are not enough to generate the measured motions which they supposedly determine. This is typically attributed to the existence of dark matter, which possesses mass but does not radiat... |
1003.2049 | Myungseok Eune | Ee Chang-Young, Myungseok Eune, Kyoungtae Kimm, Daeho Lee | Surface gravity and Hawking temperature from entropic force viewpoint | 7 pages, 1 figure; RevTeX4 | Mod.Phys.Lett. A 25 (2010) 2825-2830 | 10.1142/S0217732310033979 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a freely falling holographic screen for the Schwarzschild and
Reissner-Nordstr\"om black holes and evaluate the entropic force \`a la
Verlinde. When the screen crosses the event horizon, the temperature of the
screen agrees to the Hawking temperature and the entropic force gives rise to
the surface gravit... | [
{
"created": "Wed, 10 Mar 2010 08:54:37 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Mar 2010 05:04:36 GMT",
"version": "v2"
},
{
"created": "Fri, 2 Apr 2010 05:37:08 GMT",
"version": "v3"
}
] | 2010-11-03 | [
[
"Chang-Young",
"Ee",
""
],
[
"Eune",
"Myungseok",
""
],
[
"Kimm",
"Kyoungtae",
""
],
[
"Lee",
"Daeho",
""
]
] | We consider a freely falling holographic screen for the Schwarzschild and Reissner-Nordstr\"om black holes and evaluate the entropic force \`a la Verlinde. When the screen crosses the event horizon, the temperature of the screen agrees to the Hawking temperature and the entropic force gives rise to the surface gravity ... |
1812.10960 | Lau Loi So | Lau Loi So | The modification of the Bel-Robinson energy-momentum | 9 pages, a major revision of arXiv:1405.7883 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For describing the non-negative gravitational energy-momentum in terms of a
pure Bel-Robinson `momentum' in a quasi-local small sphere limit, the
Bel-Robinson tensor $B$ is desirable. However, we found this Bel-Robinson
`momentum' can be modified such that it still satisfy the non-spacelike and
future pointing requir... | [
{
"created": "Fri, 28 Dec 2018 11:49:55 GMT",
"version": "v1"
}
] | 2018-12-31 | [
[
"So",
"Lau Loi",
""
]
] | For describing the non-negative gravitational energy-momentum in terms of a pure Bel-Robinson `momentum' in a quasi-local small sphere limit, the Bel-Robinson tensor $B$ is desirable. However, we found this Bel-Robinson `momentum' can be modified such that it still satisfy the non-spacelike and future pointing requirem... |
1401.2403 | Abdul Jawad | M. Sharif and Abdul Jawad | Reconstruction of Scalar Field Dark Energy Models in Kaluza-Klein
Universe | 16 pages, 12 figures | Commun. Theor. Phys. 60(2013)183 | 10.1088/0253-6102/60/2/07 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to study the modified holographic dark energy model by
taking its different aspects in the flat Kaluza-Klein universe. We construct
the equation of state parameter which evolutes the universe from quintessence
region towards the vacuum. It is found that the modified holographic model
exhibits in... | [
{
"created": "Fri, 25 Oct 2013 10:04:25 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Sharif",
"M.",
""
],
[
"Jawad",
"Abdul",
""
]
] | This paper is devoted to study the modified holographic dark energy model by taking its different aspects in the flat Kaluza-Klein universe. We construct the equation of state parameter which evolutes the universe from quintessence region towards the vacuum. It is found that the modified holographic model exhibits inst... |
1610.06032 | Ezequiel Boero | Ezequiel F. Boero, Osvaldo M. Moreschi | Gravitational lens optical scalars in terms of energy-momentum
distributions in the cosmological framework | 23 pages, 4 figures | Monthly Notices of the Royal Astronomical Society, Volume 475,
Issu 4, 21 April 2018, Pages 4683-4703 | 10.1093/mnras/sty110 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present new results on gravitational lensing over a cosmological
Robertson-Walker backgrounds which extend and generalize previous works. Our
expressions show the presence of new terms and factors which have been
neglected in the literature on the subject. The new equations derived here for
the optcal scalars allo... | [
{
"created": "Wed, 19 Oct 2016 14:32:14 GMT",
"version": "v1"
},
{
"created": "Sat, 31 Dec 2016 19:29:07 GMT",
"version": "v2"
},
{
"created": "Fri, 24 Mar 2017 20:57:35 GMT",
"version": "v3"
},
{
"created": "Thu, 28 Sep 2017 13:10:26 GMT",
"version": "v4"
},
{
"c... | 2018-05-23 | [
[
"Boero",
"Ezequiel F.",
""
],
[
"Moreschi",
"Osvaldo M.",
""
]
] | We present new results on gravitational lensing over a cosmological Robertson-Walker backgrounds which extend and generalize previous works. Our expressions show the presence of new terms and factors which have been neglected in the literature on the subject. The new equations derived here for the optcal scalars allow ... |
gr-qc/0308080 | Suresh Paingalil Kunjan | P.K.Suresh | Particle Creation in Anisotropically Expanding Universe | 9 pages,LATEX, no figures | Int.J.Theor.Phys. 44 (2005) 645-654 | null | null | gr-qc | null | Using squeezed vacuum state formalism of quantum optics, an approximate
solution to the semiclassical Einstein equation is obtained in Bianchi type-I
universe. The phenomena of nonclassical particle creation is also examined in
the anisotropic background cosmology.
| [
{
"created": "Mon, 25 Aug 2003 05:57:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Suresh",
"P. K.",
""
]
] | Using squeezed vacuum state formalism of quantum optics, an approximate solution to the semiclassical Einstein equation is obtained in Bianchi type-I universe. The phenomena of nonclassical particle creation is also examined in the anisotropic background cosmology. |
1311.6348 | Artur Alho | Artur Alho, Filipe C. Mena | Covariant and gauge-invariant linear scalar perturbations in multiple
scalar field cosmologies | 42 pages, 32 figures | Phys. Rev. D 90, 043501 (2014) | 10.1103/PhysRevD.90.043501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive a set of equations monitoring the evolution of covariant and
gauge-invariant linear scalar perturbations of
Friedman-Lema\^itre-Robertson-Walker models with multiple interacting
non-linear scalar fields. We use a dynamical systems' approach in order to
perform a stability analysis for some classes of scalar... | [
{
"created": "Mon, 25 Nov 2013 16:06:51 GMT",
"version": "v1"
}
] | 2014-08-06 | [
[
"Alho",
"Artur",
""
],
[
"Mena",
"Filipe C.",
""
]
] | We derive a set of equations monitoring the evolution of covariant and gauge-invariant linear scalar perturbations of Friedman-Lema\^itre-Robertson-Walker models with multiple interacting non-linear scalar fields. We use a dynamical systems' approach in order to perform a stability analysis for some classes of scalar f... |
1001.0923 | Soumya Mohanty | Yan Wang, Soumya D. Mohanty | Particle Swarm Optimization and gravitational wave data analysis:
Performance on a binary inspiral testbed | 13 pages, 5 figures | Phys.Rev.D81:063002,2010 | 10.1103/PhysRevD.81.063002 | null | gr-qc physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection and estimation of gravitational wave (GW) signals belonging to
a parameterized family of waveforms requires, in general, the numerical
maximization of a data-dependent function of the signal parameters. Due to
noise in the data, the function to be maximized is often highly multi-modal
with numerous loca... | [
{
"created": "Wed, 6 Jan 2010 15:51:18 GMT",
"version": "v1"
}
] | 2010-04-21 | [
[
"Wang",
"Yan",
""
],
[
"Mohanty",
"Soumya D.",
""
]
] | The detection and estimation of gravitational wave (GW) signals belonging to a parameterized family of waveforms requires, in general, the numerical maximization of a data-dependent function of the signal parameters. Due to noise in the data, the function to be maximized is often highly multi-modal with numerous local ... |
1201.4250 | Alicja Siwek | M. Gawe{\l}czyk, J. Polonyi, A. Radosz, A. Siwek | Exchange of signals around the event horizon in Schwarzschild space-time | 7 pages, 6 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Red shift in communication and possibility of interaction is discussed for
objects around the event horizon of Schwarzschild space-time. It is pointed out
that the arrow of time within the horizon cannot always be inferred by
observations carried out outside. Two scenarios are presented for the causal
structure of th... | [
{
"created": "Fri, 20 Jan 2012 10:26:28 GMT",
"version": "v1"
}
] | 2012-01-23 | [
[
"Gawełczyk",
"M.",
""
],
[
"Polonyi",
"J.",
""
],
[
"Radosz",
"A.",
""
],
[
"Siwek",
"A.",
""
]
] | Red shift in communication and possibility of interaction is discussed for objects around the event horizon of Schwarzschild space-time. It is pointed out that the arrow of time within the horizon cannot always be inferred by observations carried out outside. Two scenarios are presented for the causal structure of the ... |
2002.01473 | Antonios Tsokaros A. | Antonios Tsokaros, Milton Ruiz, Stuart L. Shapiro | Locating ergostar models in parameter space | 8 pages, 3 figures. Matches published version | Phys. Rev. D 101, 064069 (2020) | 10.1103/PhysRevD.101.064069 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, we have shown that dynamically stable ergostar solutions
(equilibrium neutron stars that contain an ergoregion) with a compressible and
causal equation of state exist [A. Tsokaros, M. Ruiz, L. Sun, S. L. Shapiro,
and K. Ury\=u, Phys. Rev. Lett. 123, 231103 (2019)]. These stars are
hypermassive, differential... | [
{
"created": "Tue, 4 Feb 2020 18:59:58 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Mar 2020 16:58:10 GMT",
"version": "v2"
}
] | 2020-04-08 | [
[
"Tsokaros",
"Antonios",
""
],
[
"Ruiz",
"Milton",
""
],
[
"Shapiro",
"Stuart L.",
""
]
] | Recently, we have shown that dynamically stable ergostar solutions (equilibrium neutron stars that contain an ergoregion) with a compressible and causal equation of state exist [A. Tsokaros, M. Ruiz, L. Sun, S. L. Shapiro, and K. Ury\=u, Phys. Rev. Lett. 123, 231103 (2019)]. These stars are hypermassive, differentially... |
0712.0427 | Matt Visser | Matt Visser (Victoria University of Wellington) and Silke Weinfurtner
(Victoria University of Wellington) | Analogue spacetimes: Toy models for "quantum gravity'' | 24 pages; Based on a talk at the conference: From Quantum to Emergent
Gravity: Theory and Phenomenology, June 11-15 2007, Trieste, Italy | PoSQG-Ph:042,2007 | null | null | gr-qc | null | Why are "analogue spacetimes'' interesting? For the purposes of this workshop
the answer is simple: Analogue spacetimes provide one with physically
well-defined and physically well-understood concrete models of many of the
phenomena that seem to be part of the yet incomplete theory of "quantum
gravity'', or more acce... | [
{
"created": "Tue, 4 Dec 2007 03:35:09 GMT",
"version": "v1"
}
] | 2009-04-14 | [
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
],
[
"Weinfurtner",
"Silke",
"",
"Victoria University of Wellington"
]
] | Why are "analogue spacetimes'' interesting? For the purposes of this workshop the answer is simple: Analogue spacetimes provide one with physically well-defined and physically well-understood concrete models of many of the phenomena that seem to be part of the yet incomplete theory of "quantum gravity'', or more access... |
gr-qc/9801039 | Toporenskij A. V. | A.Yu.Kamenshchik (Landau Institute for theoretical physics, Moscow,
Russia), I.M.Khalatnikov (Landau Institute for theoretical physics and Tel
Avive University, Ramat Avive, Israel) and A.V.Toporensky (Sternberg
Astronomical Institute, Moscow, Russia) | Complex inflaton field in quantum cosmology | 34 pages with 2 gif figures, mprocl.sty, To appear in International
Journal of Modern Physics D | Int.J.Mod.Phys.D6:649-672,1997 | 10.1142/S0218271897000406 | null | gr-qc | null | We investigate the cosmological model with the complex scalar
self-interacting inflaton field non-minimally coupled to gravity. The different
geometries of the Euclidean classically forbidden regions are represented. The
instanton solutions of the corresponding Euclidean equations of motion are
found by numerical cal... | [
{
"created": "Mon, 12 Jan 1998 20:13:07 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Kamenshchik",
"A. Yu.",
"",
"Landau Institute for theoretical physics, Moscow,\n Russia"
],
[
"Khalatnikov",
"I. M.",
"",
"Landau Institute for theoretical physics and Tel\n Avive University, Ramat Avive, Israel"
],
[
"Toporensky",
"A. V.",
"",
"Sternberg... | We investigate the cosmological model with the complex scalar self-interacting inflaton field non-minimally coupled to gravity. The different geometries of the Euclidean classically forbidden regions are represented. The instanton solutions of the corresponding Euclidean equations of motion are found by numerical calcu... |
0806.4952 | Idan Shilon | Eduardo I. Guendelman and Idan Shilon | Stabilization of Neutral Thin Shells By Gravitational Effects From
Electric Fields | 5 pages, 1 figure | Class.Quant.Grav.26:045007,2009 | 10.1088/0264-9381/26/4/045007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of a system consisting of an uncharged spherically
symmetric two dimensional extended object which encloses a stationary point
charge placed in the shell's center. We show that there can be a static and
stable configuration for the neutral shell, using only the gravitational field
of the charg... | [
{
"created": "Mon, 30 Jun 2008 17:14:32 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Sep 2008 16:30:53 GMT",
"version": "v2"
},
{
"created": "Fri, 6 Feb 2009 17:34:24 GMT",
"version": "v3"
}
] | 2009-02-09 | [
[
"Guendelman",
"Eduardo I.",
""
],
[
"Shilon",
"Idan",
""
]
] | We study the properties of a system consisting of an uncharged spherically symmetric two dimensional extended object which encloses a stationary point charge placed in the shell's center. We show that there can be a static and stable configuration for the neutral shell, using only the gravitational field of the charged... |
gr-qc/0603117 | Vjacheslav Dorofeev | V.Dorofeev | A self-consistent solution in affine space with scalar field | 4 pages, LaTeX | Izvestija VUZov (Russia), Fizika, N4, p22 (2000) | null | null | gr-qc | null | Conformal connection of scalar field is shown to produce possible
non-metricity in affine connection spaces. In case of self-consistent solution
the non-metricity is a correction to background Riemannian structure with
respect to gravitational constant and its magnitude may be essential in the
early Universe.
| [
{
"created": "Wed, 29 Mar 2006 13:21:27 GMT",
"version": "v1"
}
] | 2010-10-12 | [
[
"Dorofeev",
"V.",
""
]
] | Conformal connection of scalar field is shown to produce possible non-metricity in affine connection spaces. In case of self-consistent solution the non-metricity is a correction to background Riemannian structure with respect to gravitational constant and its magnitude may be essential in the early Universe. |
1007.5227 | Remo Garattini | Remo Garattini | Gravitational Zero Point Energy and the Induced Cosmological Constant | LaTeX 10 Pages. Submitted to the volume "Cosmology, Quantum Vacuum,
and Zeta Functions", in honour of Professor Emilio Elizalde on the occasion
of his 60th birthday | null | 10.1007/978-3-642-19760-4_17 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss how to extract information about the cosmological constant from
the Wheeler-DeWitt equation, considered as an eigenvalue of a Sturm-Liouville
problem in a generic spherically symmetric background. The equation is
approximated to one loop with the help of a variational approach with Gaussian
trial wave func... | [
{
"created": "Thu, 29 Jul 2010 14:25:38 GMT",
"version": "v1"
}
] | 2015-05-19 | [
[
"Garattini",
"Remo",
""
]
] | We discuss how to extract information about the cosmological constant from the Wheeler-DeWitt equation, considered as an eigenvalue of a Sturm-Liouville problem in a generic spherically symmetric background. The equation is approximated to one loop with the help of a variational approach with Gaussian trial wave functi... |
0902.2001 | Steffen Gielen | Gary W. Gibbons, Steffen Gielen | Deformed General Relativity and Torsion | 20 pages, 1 figure, revtex; expanded sections 3 and 4 for clarity,
moved material to appendix B, corrected a few minor errors | Class.Quant.Grav.26:135005,2009 | 10.1088/0264-9381/26/13/135005 | DAMTP-2009-9 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We argue that the natural framework for embedding the ideas of deformed, or
doubly, special relativity (DSR) into a curved spacetime is a generalisation of
Einstein-Cartan theory, considered by Stelle and West. Instead of interpreting
the noncommuting "spacetime coordinates" of the Snyder algebra as endowing
spacetim... | [
{
"created": "Wed, 11 Feb 2009 21:47:50 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Feb 2009 16:40:14 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Apr 2009 22:12:37 GMT",
"version": "v3"
}
] | 2009-06-19 | [
[
"Gibbons",
"Gary W.",
""
],
[
"Gielen",
"Steffen",
""
]
] | We argue that the natural framework for embedding the ideas of deformed, or doubly, special relativity (DSR) into a curved spacetime is a generalisation of Einstein-Cartan theory, considered by Stelle and West. Instead of interpreting the noncommuting "spacetime coordinates" of the Snyder algebra as endowing spacetime ... |
1201.2871 | Christof Wetterich | C.Wetterich | Spinor gravity and diffeomorphism invariance on the lattice | 13 pages, proceedings 6th Aegean Summer School, Naxos 2011 | null | 10.1007/978-3-642-33036-0_4 | null | gr-qc hep-lat hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The key ingredient for lattice regularized quantum gravity is diffeomorphism
symmetry. We formulate a lattice functional integral for quantum gravity in
terms of fermions. This allows for a diffeomorphism invariant functional
measure and avoids problems of boundedness of the action. We discuss the
concept of lattice ... | [
{
"created": "Fri, 13 Jan 2012 15:43:44 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Wetterich",
"C.",
""
]
] | The key ingredient for lattice regularized quantum gravity is diffeomorphism symmetry. We formulate a lattice functional integral for quantum gravity in terms of fermions. This allows for a diffeomorphism invariant functional measure and avoids problems of boundedness of the action. We discuss the concept of lattice di... |
1601.06152 | Barun Majumder | Narayan Banerjee and Barun Majumder | A question mark on the equivalence of Einstein and Jordan frames | 6 pages, 4 figures. Online in Phys Lett B | null | 10.1016/j.physletb.2016.01.022 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With an explicit example, we show that Jordan frame and the conformally
transformed Einstein frames clearly lead to different physics for a
non-minimally coupled theory of gravity, namely Brans-Dicke theory, at least at
the quantum level. The example taken up is the spatially flat Friedmann
cosmology in Brans-Dicke t... | [
{
"created": "Thu, 21 Jan 2016 18:42:12 GMT",
"version": "v1"
}
] | 2016-01-25 | [
[
"Banerjee",
"Narayan",
""
],
[
"Majumder",
"Barun",
""
]
] | With an explicit example, we show that Jordan frame and the conformally transformed Einstein frames clearly lead to different physics for a non-minimally coupled theory of gravity, namely Brans-Dicke theory, at least at the quantum level. The example taken up is the spatially flat Friedmann cosmology in Brans-Dicke the... |
2012.02587 | M. Ilyas | M. Ilyas | Compact Stars in $f(\mathcal{R,G,T})$ Gravity | Some changes have been made. " To appear in International Journal of
Modern Physics A" | Int. J. Mod. Phys. A 36, 2150165 (2021) | 10.1142/S0217751X21501657 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work is to introduce a new kind of modified gravitational theory,
named as $f(\mathcal{R,G,T})$ (also $f(\mathcal{R,T,G})$) gravity, where
$\mathcal{R}$ is the Ricci scalar, $\mathcal{G}$ is Gauss-Bonnet invariant and
$\mathcal{T}$ is the trace of the energy-momentum tensor. With the help of
different mod... | [
{
"created": "Wed, 2 Dec 2020 06:57:53 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Aug 2021 13:21:17 GMT",
"version": "v2"
}
] | 2021-11-16 | [
[
"Ilyas",
"M.",
""
]
] | The present work is to introduce a new kind of modified gravitational theory, named as $f(\mathcal{R,G,T})$ (also $f(\mathcal{R,T,G})$) gravity, where $\mathcal{R}$ is the Ricci scalar, $\mathcal{G}$ is Gauss-Bonnet invariant and $\mathcal{T}$ is the trace of the energy-momentum tensor. With the help of different model... |
gr-qc/0604038 | Prasanta Mahato | Prasanta Mahato | $\theta$-Term and Cosmological Constant from CJD Action | 5 pages | Mod.Phys.Lett. A17 (2002) 475-479 | 10.1142/S0217732302006710 | null | gr-qc | null | In the gravity without metric formalism of Capovilla, Jacobson and Dell, the
topological $\theta$-term appears through a canonical transformation.The origin
of this canonical transformation is probed here. It is shown here that when
$\theta$-term appears cosmological $\lambda$-term also appears simultaneously.
| [
{
"created": "Sun, 9 Apr 2006 16:56:33 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2006 05:04:52 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Mahato",
"Prasanta",
""
]
] | In the gravity without metric formalism of Capovilla, Jacobson and Dell, the topological $\theta$-term appears through a canonical transformation.The origin of this canonical transformation is probed here. It is shown here that when $\theta$-term appears cosmological $\lambda$-term also appears simultaneously. |
2111.02129 | Gabriele Barca | Gabriele Barca, Eleonora Giovannetti, Federico Mandini, Giovanni
Montani | Polymer Quantization of the Isotropic Universe: comparison with the
Bounce of Loop Quantum Cosmology | To appear in the Proceedings of the 16th Marcel Grossmann meeting
(5-10 July, 2021) | null | 10.1142/9789811269776_0217 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We implement Polymer Quantum Mechanics on the Hamiltonian formulation of the
isotropic Universe in both the representations of the standard
Ashtekar-Barbero-Immirzi connection and of a new generalized coordinate
conjugate to the Universe volume. The resulting dynamics is a bouncing
cosmology; when quantizing the volu... | [
{
"created": "Wed, 3 Nov 2021 10:53:39 GMT",
"version": "v1"
}
] | 2023-02-01 | [
[
"Barca",
"Gabriele",
""
],
[
"Giovannetti",
"Eleonora",
""
],
[
"Mandini",
"Federico",
""
],
[
"Montani",
"Giovanni",
""
]
] | We implement Polymer Quantum Mechanics on the Hamiltonian formulation of the isotropic Universe in both the representations of the standard Ashtekar-Barbero-Immirzi connection and of a new generalized coordinate conjugate to the Universe volume. The resulting dynamics is a bouncing cosmology; when quantizing the volume... |
gr-qc/9705053 | Guy Burdet | G.Burdet and M.Perrin | Quantum Gravity:the axiomatic approach, a possible interpretation | plain-TeX,9 pages | null | null | null | gr-qc | null | Twenty years ago, by extending the Wightman axiom framework, it has been
found possible to quantize only a conformal factor of the gravitational field.
Gravitons being excluded from this quantum scalar field theory, numerous
attempts were done to give a valuable description of what could be quantum
gravity. In this t... | [
{
"created": "Wed, 21 May 1997 07:52:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Burdet",
"G.",
""
],
[
"Perrin",
"M.",
""
]
] | Twenty years ago, by extending the Wightman axiom framework, it has been found possible to quantize only a conformal factor of the gravitational field. Gravitons being excluded from this quantum scalar field theory, numerous attempts were done to give a valuable description of what could be quantum gravity. In this tal... |
1104.1150 | Yuri Bonder | Yuri Bonder | Lorentz invariant phenomenology of quantum gravity: Main ideas behind
the model | This work was presented at Rencontres de Moriond and GPhyS
Colloquium: Gravitational Waves and Experimental Gravity 2011; 3 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the past decade the phenomenology of quantum gravity has been dominated by
the search of violations of Lorentz invariance. However, there are very serious
arguments that led us to assume that this invariance is a symmetry in Nature.
This motivated us to construct a phenomenological model describing how a
Lorentz i... | [
{
"created": "Wed, 6 Apr 2011 17:06:02 GMT",
"version": "v1"
}
] | 2011-04-07 | [
[
"Bonder",
"Yuri",
""
]
] | In the past decade the phenomenology of quantum gravity has been dominated by the search of violations of Lorentz invariance. However, there are very serious arguments that led us to assume that this invariance is a symmetry in Nature. This motivated us to construct a phenomenological model describing how a Lorentz inv... |
0908.0365 | Frank B. Estabrook | Frank B. Estabrook | The Hilbert Lagrangian and Isometric Embedding: Tetrad Formulation of
Regge-Teitelboim Gravity | 12 pages, 1 figure. Version 2 has modified title and text, reflecting
added earlier references. New Introduction | J. Math. Phys. 51:042502,2010 | 10.1063/1.3352557 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss Exterior Differential Systems (EDS) for the vacuum gravitational
field. These EDS are derived by varying the Hilbert-Einstein Lagrangian, given
most elegantly as a Cartan 4-forrm calibrating 4-spaces embedded in ten flat
dimensions. In particular we thus formulate with tetrad equations the
Regge-Teitelboim... | [
{
"created": "Mon, 3 Aug 2009 23:59:45 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Oct 2009 18:34:26 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Estabrook",
"Frank B.",
""
]
] | We discuss Exterior Differential Systems (EDS) for the vacuum gravitational field. These EDS are derived by varying the Hilbert-Einstein Lagrangian, given most elegantly as a Cartan 4-forrm calibrating 4-spaces embedded in ten flat dimensions. In particular we thus formulate with tetrad equations the Regge-Teitelboim d... |
gr-qc/0210102 | Nils Andersson | K.H. Lockitch, J.L. Friedman and N. Andersson | The rotational modes of relativistic stars: Numerical results | RevTeX, 29 pages, 31 eps figures | Phys.Rev. D68 (2003) 124010 | 10.1103/PhysRevD.68.124010 | null | gr-qc astro-ph | null | We study the inertial modes of slowly rotating, fully relativistic compact
stars. The equations that govern perturbations of both barotropic and
non-barotropic models are discussed, but we present numerical results only for
the barotropic case. For barotropic stars all inertial modes are a hybrid
mixture of axial and... | [
{
"created": "Tue, 29 Oct 2002 18:12:15 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Lockitch",
"K. H.",
""
],
[
"Friedman",
"J. L.",
""
],
[
"Andersson",
"N.",
""
]
] | We study the inertial modes of slowly rotating, fully relativistic compact stars. The equations that govern perturbations of both barotropic and non-barotropic models are discussed, but we present numerical results only for the barotropic case. For barotropic stars all inertial modes are a hybrid mixture of axial and p... |
2302.01159 | Andrew Mummery | Andrew Mummery and Steven Balbus | A complete characterisation of the orbital shapes of the non-circular
Kerr geodesic solutions with circular orbit constants of motion | 14 pages, 10 figures. Comments welcomed | null | 10.1103/PhysRevD.107.124058 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We present analytical solutions describing a family of both inwardly and
outwardly spiralling orbits in the Kerr spacetime. The solutions are exact, and
remarkable for their simplicity. These orbits all have the angular momentum and
energy of a circular orbit at some radius $r_c$, but are not restricted to
remaining ... | [
{
"created": "Thu, 2 Feb 2023 15:26:30 GMT",
"version": "v1"
}
] | 2023-07-12 | [
[
"Mummery",
"Andrew",
""
],
[
"Balbus",
"Steven",
""
]
] | We present analytical solutions describing a family of both inwardly and outwardly spiralling orbits in the Kerr spacetime. The solutions are exact, and remarkable for their simplicity. These orbits all have the angular momentum and energy of a circular orbit at some radius $r_c$, but are not restricted to remaining on... |
2405.05410 | Avi Loeb | Abraham Loeb (Harvard) | Pulsar Timing Noise from Brownian Motion of the Sun | Accepted for publication in ApJL, 5 pages (final version) | null | null | null | gr-qc astro-ph.EP astro-ph.SR | http://creativecommons.org/licenses/by/4.0/ | Recently, Pulsar Timing Arrays (PTAs) reported a signal at nanohertz
frequencies consistent with a stochastic gravitational wave background. Here, I
show that the Brownian motion of the Sun as a result of its random
gravitational interactions with the cluster of thousands of unmodeled Main-belt
asteroids of diameters... | [
{
"created": "Wed, 8 May 2024 20:25:04 GMT",
"version": "v1"
},
{
"created": "Mon, 13 May 2024 17:54:13 GMT",
"version": "v2"
},
{
"created": "Wed, 15 May 2024 15:30:31 GMT",
"version": "v3"
},
{
"created": "Sat, 25 May 2024 09:00:53 GMT",
"version": "v4"
},
{
"cr... | 2024-06-13 | [
[
"Loeb",
"Abraham",
"",
"Harvard"
]
] | Recently, Pulsar Timing Arrays (PTAs) reported a signal at nanohertz frequencies consistent with a stochastic gravitational wave background. Here, I show that the Brownian motion of the Sun as a result of its random gravitational interactions with the cluster of thousands of unmodeled Main-belt asteroids of diameters <... |
gr-qc/0208062 | Alexander Westphal | A. Westphal | Quantum Mechanics and Gravitation | 149 pages, 45 figures | null | null | null | gr-qc | null | In summer 1999 an experiment at ILL, Grenoble was conducted. So-called
ultra-cold neutrons (UCN) were trapped in the vertical direction between the
Fermi-potential of a smooth mirror below and the gravitational potential of the
earth above [Ne00, Ru00]. If quantum mechanics turns out to be a sufficiently
correct desc... | [
{
"created": "Wed, 21 Aug 2002 20:38:21 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Apr 2003 19:43:08 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Westphal",
"A.",
""
]
] | In summer 1999 an experiment at ILL, Grenoble was conducted. So-called ultra-cold neutrons (UCN) were trapped in the vertical direction between the Fermi-potential of a smooth mirror below and the gravitational potential of the earth above [Ne00, Ru00]. If quantum mechanics turns out to be a sufficiently correct descri... |
0710.3690 | Mark Israelit | Mark Israelit (Univ. Haifa - Oranim) | Wesson's IMT with a Weylian bulk | 29 pages | Found.Phys.35:1725-1748,2005 | 10.1007/s10701-005-6518-5 | null | gr-qc | null | The foundations of Wesson's induced matter theory are analyzed. It is shown
that the 5D empty bulk must be regarded rather as a Weylian space than as a
Riemannian one.The framework of a Weyl-Dirac version of Wesson's theory is
elaborated and discussed. The bulk possesses in addition to the metric tensor a
Weylian con... | [
{
"created": "Fri, 19 Oct 2007 12:49:12 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Israelit",
"Mark",
"",
"Univ. Haifa - Oranim"
]
] | The foundations of Wesson's induced matter theory are analyzed. It is shown that the 5D empty bulk must be regarded rather as a Weylian space than as a Riemannian one.The framework of a Weyl-Dirac version of Wesson's theory is elaborated and discussed. The bulk possesses in addition to the metric tensor a Weylian conne... |
1001.0359 | Parthasarathi Majumdar | Parthapratim Pradhan and Parthasarathi Majumdar | Circular Orbits in Extremal Reissner Nordstrom Spacetimes | 13 Pages Latex 2e, no figures; title of paper, abstract and contents
modified substantively following critique of anonymous referee | Phys.Lett.A375:474-479,2011 | 10.1016/j.physleta.2010.11.015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Circular null geodesic orbits, in extremal Reissner-Nordstrom spacetimes, are
examined with regard to their stability, and compared with similar orbits in
the near-extremal situation. Extremization of the effective potential for null
circular orbits shows the existence of a stable circular geodesic in the
extremal sp... | [
{
"created": "Sun, 3 Jan 2010 11:08:01 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Apr 2010 10:05:01 GMT",
"version": "v2"
}
] | 2011-01-17 | [
[
"Pradhan",
"Parthapratim",
""
],
[
"Majumdar",
"Parthasarathi",
""
]
] | Circular null geodesic orbits, in extremal Reissner-Nordstrom spacetimes, are examined with regard to their stability, and compared with similar orbits in the near-extremal situation. Extremization of the effective potential for null circular orbits shows the existence of a stable circular geodesic in the extremal spac... |
1106.3743 | Jose Luis Jaramillo | Jos\'e Luis Jaramillo, Mart\'in Reiris and Sergio Dain | Black hole Area-Angular momentum inequality in non-vacuum spacetimes | 5 pages, no figures, updated to match published version | Phys.Rev. D84, 121503(R) (2011) | 10.1103/PhysRevD.84.121503 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the area-angular momentum inequality A\geq 8\pi|J| holds for
axially symmetric closed outermost stably marginally trapped surfaces. These
are horizon sections (in particular, apparent horizons) contained in otherwise
generic non-necessarily axisymmetric black hole spacetimes, with non-negative
cosmologic... | [
{
"created": "Sun, 19 Jun 2011 13:22:02 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jan 2012 14:06:01 GMT",
"version": "v2"
}
] | 2012-08-28 | [
[
"Jaramillo",
"José Luis",
""
],
[
"Reiris",
"Martín",
""
],
[
"Dain",
"Sergio",
""
]
] | We show that the area-angular momentum inequality A\geq 8\pi|J| holds for axially symmetric closed outermost stably marginally trapped surfaces. These are horizon sections (in particular, apparent horizons) contained in otherwise generic non-necessarily axisymmetric black hole spacetimes, with non-negative cosmological... |
1204.1530 | Ayan Chatterjee | Ayan Chatterjee, Bhramar Chatterjee and Amit Ghosh | Hawking radiation from dynamical horizons | 5 Pages | null | 10.1103/PhysRevD.87.084051 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In completely local settings, we establish that a dynamically evolving black
hole horizon can be assigned a Hawking temperature. Moreover, we calculate the
Hawking flux and show that the radius of the horizon shrinks.
| [
{
"created": "Fri, 6 Apr 2012 18:39:47 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Chatterjee",
"Ayan",
""
],
[
"Chatterjee",
"Bhramar",
""
],
[
"Ghosh",
"Amit",
""
]
] | In completely local settings, we establish that a dynamically evolving black hole horizon can be assigned a Hawking temperature. Moreover, we calculate the Hawking flux and show that the radius of the horizon shrinks. |
1706.06812 | Heon-Ju Lee | DongBong Yang and Heon-Ju Lee | Results in the Spontaneous Annihilation of the Cosmological Constant | 6 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest a new formula, which allows the Schwarzschild's solution and the
Einstein radius to be applied to the dynamic universe, when our universe is
hypothetically regarded as a single dynamic black hole. In this study, a
cosmological constant problem is solved in the simplest manner, while we find
excellent agree... | [
{
"created": "Wed, 21 Jun 2017 10:02:52 GMT",
"version": "v1"
}
] | 2017-06-22 | [
[
"Yang",
"DongBong",
""
],
[
"Lee",
"Heon-Ju",
""
]
] | We suggest a new formula, which allows the Schwarzschild's solution and the Einstein radius to be applied to the dynamic universe, when our universe is hypothetically regarded as a single dynamic black hole. In this study, a cosmological constant problem is solved in the simplest manner, while we find excellent agreeme... |
1703.10154 | Bogeun Gwak | Bogeun Gwak | Collision of Two Rotating Hayward Black Holes | 25 pages, 43 figures, published version in EPJC | Eur. Phys. J. C 77, no. 7, 482 (2017) | 10.1140/epjc/s10052-017-5055-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the spin interaction and the gravitational radiation thermally
allowed in a head-on collision of two rotating Hayward black holes. The Hayward
black hole is a regular black hole in a modified Einstein equation, and hence
it can be an appropriate model to describe the extent to which the regularity
effe... | [
{
"created": "Wed, 29 Mar 2017 17:49:46 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Jul 2017 16:49:20 GMT",
"version": "v2"
}
] | 2017-07-24 | [
[
"Gwak",
"Bogeun",
""
]
] | We investigate the spin interaction and the gravitational radiation thermally allowed in a head-on collision of two rotating Hayward black holes. The Hayward black hole is a regular black hole in a modified Einstein equation, and hence it can be an appropriate model to describe the extent to which the regularity effect... |
1105.4515 | Alexander Kamenshchik | A.A. Andrianov, F. Cannata and A.Yu. Kamenshchik | General solution of scalar field cosmology with a (piecewise)
exponential potential | 19 pages, 3 figures | null | 10.1088/1475-7516/2011/10/004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study in detail the general solution for a scalar field cosmology with an
exponential potential, correcting some imprecisions, encountered previously in
the literature. In addition, we generalize this solution for a piecewise
exponential potential, which is continuous, but not smooth (with cusps).
| [
{
"created": "Mon, 23 May 2011 14:40:42 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Andrianov",
"A. A.",
""
],
[
"Cannata",
"F.",
""
],
[
"Kamenshchik",
"A. Yu.",
""
]
] | We study in detail the general solution for a scalar field cosmology with an exponential potential, correcting some imprecisions, encountered previously in the literature. In addition, we generalize this solution for a piecewise exponential potential, which is continuous, but not smooth (with cusps). |
0908.3665 | Patrick Sutton | Patrick J. Sutton, Gareth Jones, Shourov Chatterji, Peter Michael
Kalmus, Isabel Leonor, Stephen Poprocki, Jameson Rollins, Antony Searle, Leo
Stein, Massimo Tinto, Michal Was | X-Pipeline: An analysis package for autonomous gravitational-wave burst
searches | 18 pages, 10 figures. Minor edits and clarifications; added more
background on gravitational waves and detectors. To appear in New Journal of
Physics. | New J.Phys.12:053034,2010 | 10.1088/1367-2630/12/5/053034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Autonomous gravitational-wave searches -- fully automated analyses of data
that run without human intervention or assistance -- are desirable for a number
of reasons. They are necessary for the rapid identification of
gravitational-wave burst candidates, which in turn will allow for follow-up
observations by other ob... | [
{
"created": "Tue, 25 Aug 2009 19:29:12 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Apr 2010 10:07:09 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Sutton",
"Patrick J.",
""
],
[
"Jones",
"Gareth",
""
],
[
"Chatterji",
"Shourov",
""
],
[
"Kalmus",
"Peter Michael",
""
],
[
"Leonor",
"Isabel",
""
],
[
"Poprocki",
"Stephen",
""
],
[
"Rollins",
"Jameson",
... | Autonomous gravitational-wave searches -- fully automated analyses of data that run without human intervention or assistance -- are desirable for a number of reasons. They are necessary for the rapid identification of gravitational-wave burst candidates, which in turn will allow for follow-up observations by other obse... |
2211.07497 | Roberto Chan | R. Chan, M. F. A. da Silva and V. H. Satheeshkumar | Is Birkhoff's Theorem Valid in Einstein-Aether Theory? | 19 pages, no figures | Physics Letters B, Volume 850, 2024, 138544 | 10.1016/j.physletb.2024.138544 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We attempt to answer whether Birkhoff's theorem (BT) is valid in the
Einstein-Aether (EA) theory. The BT states that any spherically symmetric
solution of the vacuum field equations must be static, unique, and
asymptotically flat. For a general spherically symmetric metric with metric
functions $A(r,t)$ \& $B(r,t)$, ... | [
{
"created": "Mon, 14 Nov 2022 16:26:52 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jul 2023 07:54:57 GMT",
"version": "v2"
}
] | 2024-03-06 | [
[
"Chan",
"R.",
""
],
[
"da Silva",
"M. F. A.",
""
],
[
"Satheeshkumar",
"V. H.",
""
]
] | We attempt to answer whether Birkhoff's theorem (BT) is valid in the Einstein-Aether (EA) theory. The BT states that any spherically symmetric solution of the vacuum field equations must be static, unique, and asymptotically flat. For a general spherically symmetric metric with metric functions $A(r,t)$ \& $B(r,t)$, an... |
1506.06948 | Jose Geraldo Pereira | A. Araujo and J. G. Pereira | Entropy in locally-de Sitter spacetimes | 11 pages. V2: presentation changes aiming at clarifying the text.
Version accepted for publication in Int. J. Mod. Phys. D | Int. J. Mod. Phys. D 24 (2015) 1550099 (12 pages) | 10.1142/S0218271815500996 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As quotient spaces, Minkowski and de Sitter are fundamental spacetimes in the
sense that they are known "a priori", independently of Einstein equation. They
represent different non-gravitational backgrounds for the construction of
physical theories. If general relativity is constructed on a de Sitter
spacetime, the u... | [
{
"created": "Tue, 23 Jun 2015 11:24:23 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Aug 2015 13:33:22 GMT",
"version": "v2"
}
] | 2015-08-18 | [
[
"Araujo",
"A.",
""
],
[
"Pereira",
"J. G.",
""
]
] | As quotient spaces, Minkowski and de Sitter are fundamental spacetimes in the sense that they are known "a priori", independently of Einstein equation. They represent different non-gravitational backgrounds for the construction of physical theories. If general relativity is constructed on a de Sitter spacetime, the und... |
2403.02056 | Prosenjit Paul | Prosenjit Paul, S. I. Kruglov | Magnetic black holes in 4$D$ Einstein--Gauss--Bonnet massive gravity
coupled to nonlinear electrodynamics | 79 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate Einstein-Gauss-Bonnet (EGB) 4D massive gravity coupled to
nonlinear electrodynamics (NED) in an Anti-de-Sitter (AdS) background and find
an exact magnetically charged black hole solution. The metric function was
analyzed for different values of massive gravity parameters. We verified the
first law of b... | [
{
"created": "Mon, 4 Mar 2024 13:59:56 GMT",
"version": "v1"
}
] | 2024-03-05 | [
[
"Paul",
"Prosenjit",
""
],
[
"Kruglov",
"S. I.",
""
]
] | We investigate Einstein-Gauss-Bonnet (EGB) 4D massive gravity coupled to nonlinear electrodynamics (NED) in an Anti-de-Sitter (AdS) background and find an exact magnetically charged black hole solution. The metric function was analyzed for different values of massive gravity parameters. We verified the first law of bla... |
1908.07419 | Adam Pound | Adam Pound, Barry Wardell, Niels Warburton, Jeremy Miller | Second-order self-force calculation of the gravitational binding energy
in compact binaries | 6 pages + supplemental material, 3 figures, revised title and two
added references | Phys. Rev. Lett. 124, 021101 (2020) | 10.1103/PhysRevLett.124.021101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Self-force theory is the leading method of modeling extreme-mass-ratio
inspirals (EMRIs), key sources for the gravitational-wave detector LISA. It is
well known that for an accurate EMRI model, second-order self-force effects are
critical, but calculations of these effects have been beset by obstacles. In
this letter... | [
{
"created": "Tue, 20 Aug 2019 15:12:55 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Oct 2019 23:39:47 GMT",
"version": "v2"
},
{
"created": "Tue, 19 Nov 2019 21:43:26 GMT",
"version": "v3"
}
] | 2020-01-22 | [
[
"Pound",
"Adam",
""
],
[
"Wardell",
"Barry",
""
],
[
"Warburton",
"Niels",
""
],
[
"Miller",
"Jeremy",
""
]
] | Self-force theory is the leading method of modeling extreme-mass-ratio inspirals (EMRIs), key sources for the gravitational-wave detector LISA. It is well known that for an accurate EMRI model, second-order self-force effects are critical, but calculations of these effects have been beset by obstacles. In this letter w... |
gr-qc/0009068 | Hrvoje Nikolic | H. Nikolic | Fermi co-ordinates and relativistic effects in non-inertial frames | 9 pages, talk presented at the conference "Physical Interpretations
of Relativity Theory VII", London, September 15-18, 2000, to appear in the
proceedings | null | null | null | gr-qc | null | Fermi co-ordinates are proper co-ordinates of a local observer determined by
his trajectory in space-time. Two observers at different positions belong to
different Fermi frames even if there is no relative motion between them. Use of
Fermi co-ordinates leads to several physical conclusions related to
relativistic eff... | [
{
"created": "Tue, 19 Sep 2000 14:10:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nikolic",
"H.",
""
]
] | Fermi co-ordinates are proper co-ordinates of a local observer determined by his trajectory in space-time. Two observers at different positions belong to different Fermi frames even if there is no relative motion between them. Use of Fermi co-ordinates leads to several physical conclusions related to relativistic effec... |
gr-qc/0205089 | Jean-Paul Mbelek | J.P. Mbelek and M. Lachi\`eze-Rey | A five dimensional model of varying effective gravitational and fine
structure constants | Latex2e, 10 pages with 1 Postscript figure, revised version of
gr-qc/0205089, accepted for publication in Astronomy and Astrophysics. Slight
changes in the figure and the figure caption, some references added | Astron.Astrophys.397:803-807,2003 | 10.1051/0004-6361:20021521 | null | gr-qc | null | We explore the possibility that the reported time variation of the fine
structure constant $\alpha$ is due to a coupling between electromagnetism and
gravitation. This may reconcile the claimed results on $\alpha$ with the upper
limit from the Oklo naturel Uranium fission reactor.
| [
{
"created": "Tue, 21 May 2002 08:59:06 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Oct 2002 14:23:41 GMT",
"version": "v2"
}
] | 2011-05-23 | [
[
"Mbelek",
"J. P.",
""
],
[
"Lachièze-Rey",
"M.",
""
]
] | We explore the possibility that the reported time variation of the fine structure constant $\alpha$ is due to a coupling between electromagnetism and gravitation. This may reconcile the claimed results on $\alpha$ with the upper limit from the Oklo naturel Uranium fission reactor. |
gr-qc/0402072 | Giovanni Imponente | Giovanni Imponente and Giovanni Montani | Mixmaster Chaos via the Invariant Measure | 3 pages, 1 figure, proceedings of the X Marcel Grossmann Meeting
22-26 July, 2003, Rio de Janeiro | null | 10.1142/9789812704030_0220 | null | gr-qc hep-th | null | The chaoticity of the Mixmaster is discussed in the framework of Statistical
Mechanics by using Misner--Chitre-like variables and an ADM reduction of its
dynamics. We show that such a system is well described by a microcanonical
ensemble whose invariant measure is induced by the corresponding Liouville one
and is uni... | [
{
"created": "Mon, 16 Feb 2004 10:37:47 GMT",
"version": "v1"
}
] | 2016-11-09 | [
[
"Imponente",
"Giovanni",
""
],
[
"Montani",
"Giovanni",
""
]
] | The chaoticity of the Mixmaster is discussed in the framework of Statistical Mechanics by using Misner--Chitre-like variables and an ADM reduction of its dynamics. We show that such a system is well described by a microcanonical ensemble whose invariant measure is induced by the corresponding Liouville one and is unifo... |
2103.15884 | Christos Tsagas | Christos G. Tsagas | The peculiar Jeans length | Revised and extended version. References added. Matches published
manuscript | Eur. Phys. J. C 81, 753 (2021) | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Typical observers in the universe do not follow the smooth Hubble expansion,
but move relative to it. Such bulk peculiar motions introduce a characteristic
scale that is closely analogous to the familiar Jeans length. This "peculiar
Jeans length" marks the threshold below which relative-motion effects dominate
the li... | [
{
"created": "Mon, 29 Mar 2021 18:45:20 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Sep 2021 12:10:47 GMT",
"version": "v2"
}
] | 2021-09-17 | [
[
"Tsagas",
"Christos G.",
""
]
] | Typical observers in the universe do not follow the smooth Hubble expansion, but move relative to it. Such bulk peculiar motions introduce a characteristic scale that is closely analogous to the familiar Jeans length. This "peculiar Jeans length" marks the threshold below which relative-motion effects dominate the line... |
2011.00984 | Maksym Deliyergiyev | Antonino Del Popolo, Maksym Deliyergiyev and Morgan Le Delliou | Solution to the hyperon puzzle using dark matter | 12 pp, 6 figs | Phys.Dark Univ. 30 (2020) 100622 | 10.1016/j.dark.2020.100622 | null | gr-qc astro-ph.HE hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we studied the ``hyperon puzzle", a problem that nevertheless
the large number of studies is still an open problem. The solution of this
issue requires one or more mechanisms that could eventually provide the
additional repulsion needed to make the EoS stiffer and, therefore, the value
of $M_{\rm{max},... | [
{
"created": "Mon, 2 Nov 2020 14:02:40 GMT",
"version": "v1"
},
{
"created": "Fri, 10 Mar 2023 19:29:30 GMT",
"version": "v2"
}
] | 2023-03-14 | [
[
"Del Popolo",
"Antonino",
""
],
[
"Deliyergiyev",
"Maksym",
""
],
[
"Delliou",
"Morgan Le",
""
]
] | In this paper, we studied the ``hyperon puzzle", a problem that nevertheless the large number of studies is still an open problem. The solution of this issue requires one or more mechanisms that could eventually provide the additional repulsion needed to make the EoS stiffer and, therefore, the value of $M_{\rm{max}, T... |
1303.3042 | Richard Woodard | H. Degueldre (MPI, Goettingen) and R. P. Woodard (U. Florida) | One Loop Field Strengths of Charges and Dipoles on a Locally de Sitter
Background | 35 pages, no figures, uses LaTeX 2e | null | 10.1140/epjc/s10052-013-2457-z | UFIFT-QG-13-01 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the one loop vacuum polarization induced by scalar quantum
electrodynamics to compute the electric and magnetic fields of point charges
and magnetic dipoles on a locally de Sitter background. Our results are
consistent with the physical picture of an inflating universe filling with a
vast sea of charged partic... | [
{
"created": "Tue, 12 Mar 2013 21:35:28 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Degueldre",
"H.",
"",
"MPI, Goettingen"
],
[
"Woodard",
"R. P.",
"",
"U. Florida"
]
] | We use the one loop vacuum polarization induced by scalar quantum electrodynamics to compute the electric and magnetic fields of point charges and magnetic dipoles on a locally de Sitter background. Our results are consistent with the physical picture of an inflating universe filling with a vast sea of charged particle... |
0904.1087 | Larry Ford | Hongwei Yu, N.F. Svaiter and L.H. Ford | Quantum Lightcone Fluctuations in Compactified Spacetimes | 28 pages, 4 figures | Phys.Rev.D80:124019,2009 | 10.1103/PhysRevD.80.124019 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We treat the effects of compactified spatial dimensions on the propagation of
light in the uncompactified directions in the context of linearized quantum
gravity. We find that the flight times of pulses can fluctuate due to
modification of the graviton vacuum by the compactification. In the case of a
five dimensional... | [
{
"created": "Tue, 7 Apr 2009 09:18:10 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"Yu",
"Hongwei",
""
],
[
"Svaiter",
"N. F.",
""
],
[
"Ford",
"L. H.",
""
]
] | We treat the effects of compactified spatial dimensions on the propagation of light in the uncompactified directions in the context of linearized quantum gravity. We find that the flight times of pulses can fluctuate due to modification of the graviton vacuum by the compactification. In the case of a five dimensional K... |
2302.02469 | Eleonora Giovannetti | Eleonora Giovannetti and Giovanni Montani | The role of spatial curvature in constraining the Universe anisotropies
across a Big Bounce | null | Eur. Phys. J. C 83, 752 (2023) | 10.1140/epjc/s10052-023-11921-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the implementation of Polymer Quantum Mechanics (PQM) to a system
decomposed into a quasi-classical background and a small quantum subsystem,
according to the original Vilenkin proposal. We develop the whole formalism in
the momentum representation that is the only viable in the continuum limit of
the polyme... | [
{
"created": "Sun, 5 Feb 2023 19:52:54 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Feb 2023 15:00:25 GMT",
"version": "v2"
}
] | 2023-09-15 | [
[
"Giovannetti",
"Eleonora",
""
],
[
"Montani",
"Giovanni",
""
]
] | We study the implementation of Polymer Quantum Mechanics (PQM) to a system decomposed into a quasi-classical background and a small quantum subsystem, according to the original Vilenkin proposal. We develop the whole formalism in the momentum representation that is the only viable in the continuum limit of the polymer ... |
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