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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1606.05879 | Richard Woodard | D. J. Brooker (Florida), S. D. Odintsov (Barcelona) and R. P. Woodard
(Florida) | Precision Predictions for the Primordial Power Spectra from f(R) Models
of Inflation | 27 pages, 8 figures, uses LaTeX2e Version 2 slightly revised for
publication | Nucl. Phys. B911 (2016) 318-337 | 10.1016/j.nuclphysb.2016.08.010 | UFIFT-QG-16-03 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the power spectra of f(R) inflation using a new technique in which
the norm-squared of the mode functions is evolved. Our technique results in
excellent analytic approximations for how the spectra depend upon the function
$f(R)$. Although the spectra are numerically the same in the Jordan and
Einstein frames... | [
{
"created": "Sun, 19 Jun 2016 15:07:13 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Sep 2016 17:34:05 GMT",
"version": "v2"
}
] | 2016-09-08 | [
[
"Brooker",
"D. J.",
"",
"Florida"
],
[
"Odintsov",
"S. D.",
"",
"Barcelona"
],
[
"Woodard",
"R. P.",
"",
"Florida"
]
] | We study the power spectra of f(R) inflation using a new technique in which the norm-squared of the mode functions is evolved. Our technique results in excellent analytic approximations for how the spectra depend upon the function $f(R)$. Although the spectra are numerically the same in the Jordan and Einstein frames f... |
gr-qc/0408003 | Matthew Anderson | Richard A. Matzner | Hyperbolicity and Constrained Evolution in Linearized Gravity | 18 pages | Phys.Rev. D71 (2005) 024011 | 10.1103/PhysRevD.71.024011 | null | gr-qc | null | Solving the 4-d Einstein equations as evolution in time requires solving
equations of two types: the four elliptic initial data (constraint) equations,
followed by the six second order evolution equations. Analytically the
constraint equations remain solved under the action of the evolution, and one
approach is to si... | [
{
"created": "Sat, 31 Jul 2004 19:10:36 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Matzner",
"Richard A.",
""
]
] | Solving the 4-d Einstein equations as evolution in time requires solving equations of two types: the four elliptic initial data (constraint) equations, followed by the six second order evolution equations. Analytically the constraint equations remain solved under the action of the evolution, and one approach is to simp... |
2405.13354 | Subhra Bhattacharya | Subhra Bhattacharya | Some Classes of Interacting Two-Fluid Model of the Expanding Universe | null | Physica Scripta (2024) | 10.1088/1402-4896/ad4ea7 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider interacting dark matter-dark energy models arising out of a
general interaction term
$Q=f(\rho_{m},\rho_{d},\dot{\rho}_{m},\dot{\rho}_{d}).$ Here $f$ is a
functional relation connecting the energy densities $\rho_{m}$ and $\rho_{d}$
and their derivatives w.r.t. time $t.$ In our model we consider two inter... | [
{
"created": "Wed, 22 May 2024 05:16:39 GMT",
"version": "v1"
}
] | 2024-05-24 | [
[
"Bhattacharya",
"Subhra",
""
]
] | We consider interacting dark matter-dark energy models arising out of a general interaction term $Q=f(\rho_{m},\rho_{d},\dot{\rho}_{m},\dot{\rho}_{d}).$ Here $f$ is a functional relation connecting the energy densities $\rho_{m}$ and $\rho_{d}$ and their derivatives w.r.t. time $t.$ In our model we consider two interac... |
gr-qc/0609029 | Dah-Wei Chiou | Dah-Wei Chiou | Loop Quantum Cosmology in Bianchi Type I Models: Analytical
Investigation | 53 pages, 2 figures; more typos corrected; HyperTeX enabled | Phys.Rev.D75:024029,2007 | 10.1103/PhysRevD.75.024029 | null | gr-qc | null | The comprehensive formulation for loop quantum cosmology in the spatially
flat, isotropic model was recently constructed. In this paper, the methods are
extended to the anisotropic Bianchi I cosmology. Both the precursor and the
improved strategies are applied and the expected results are established: (i)
the scalar ... | [
{
"created": "Thu, 7 Sep 2006 20:39:34 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Sep 2006 16:03:17 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Nov 2006 00:34:48 GMT",
"version": "v3"
},
{
"created": "Tue, 2 Jan 2007 22:45:16 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Chiou",
"Dah-Wei",
""
]
] | The comprehensive formulation for loop quantum cosmology in the spatially flat, isotropic model was recently constructed. In this paper, the methods are extended to the anisotropic Bianchi I cosmology. Both the precursor and the improved strategies are applied and the expected results are established: (i) the scalar fi... |
1510.04060 | Alan Pavan Bendasoli | A. B. Pavan, Rodrigo Silva Lima and Lu\'is Filipe de Almeida Roque | Comment on "Quasinormal modes of Schwarzschild anti de Sitter black
holes: Electromagnetic and gravitational perturbations" | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quasinormal modes of the electromagnetic and gravitational perturbation
on Schwarzschild-AdS black hole calculated by Cardoso and Lemos has been
revisited. Although the equations of motion are correct some frequencies
calculated previously by the authors are not. We present the new values of
quasinormal modes and... | [
{
"created": "Wed, 14 Oct 2015 12:16:09 GMT",
"version": "v1"
}
] | 2015-10-15 | [
[
"Pavan",
"A. B.",
""
],
[
"Lima",
"Rodrigo Silva",
""
],
[
"Roque",
"Luís Filipe de Almeida",
""
]
] | The quasinormal modes of the electromagnetic and gravitational perturbation on Schwarzschild-AdS black hole calculated by Cardoso and Lemos has been revisited. Although the equations of motion are correct some frequencies calculated previously by the authors are not. We present the new values of quasinormal modes and d... |
1010.5227 | Elena Magliaro | Elena Magliaro and Claudio Perini | Local spin foams | 9 pages, 8 figures, published version | Int.J.Mod.Phys. D21 (2012) 1250090 | 10.1142/S0218271812500903 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The central object of this paper is a holonomy formulation for spin foams.
Within this new represen- tation, we analyze three general requirements:
locality, composition law, cylindrical consistency. In particular, cylindrical
consistency is shown to fix the arbitrary normalization of the vertex amplitude
in the case... | [
{
"created": "Mon, 25 Oct 2010 19:27:23 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Jan 2013 17:46:33 GMT",
"version": "v2"
}
] | 2013-01-09 | [
[
"Magliaro",
"Elena",
""
],
[
"Perini",
"Claudio",
""
]
] | The central object of this paper is a holonomy formulation for spin foams. Within this new represen- tation, we analyze three general requirements: locality, composition law, cylindrical consistency. In particular, cylindrical consistency is shown to fix the arbitrary normalization of the vertex amplitude in the case o... |
2203.08567 | Maciej Dunajski | Maciej Dunajski, Roger Penrose | Quantum state reduction, and Newtonian twistor theory | 14 pages, one figure. Final version, published in the Annals of
Physics | Annals of Physics. Volume 451, April 2023, 169243 | 10.1016/j.aop.2023.169243 | null | gr-qc hep-th math.DG quant-ph | http://creativecommons.org/licenses/by/4.0/ | We discuss the equivalence principle in quantum mechanics in the context of
Newton--Cartan geometry, and non--relativistic twistor theory.
| [
{
"created": "Wed, 16 Mar 2022 11:58:20 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Feb 2023 14:27:04 GMT",
"version": "v2"
}
] | 2023-03-01 | [
[
"Dunajski",
"Maciej",
""
],
[
"Penrose",
"Roger",
""
]
] | We discuss the equivalence principle in quantum mechanics in the context of Newton--Cartan geometry, and non--relativistic twistor theory. |
1107.2669 | W. G. Unruh | W. G. Unruh | Quantum Noise in Amplifiers and Hawking/Dumb-Hole Radiation as Amplifier
Noise | 13 pages, 4 figures | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum noise in a linear amplifier is shown to be thermal noise. The
theory of linear amplifiers is applied first to the simplest, single or double
oscillator model of an amplifier, and then to linear model of an amplifier with
continuous fields and input and outputs. Finally it is shown that the thermal
noise e... | [
{
"created": "Wed, 13 Jul 2011 20:32:09 GMT",
"version": "v1"
}
] | 2011-07-15 | [
[
"Unruh",
"W. G.",
""
]
] | The quantum noise in a linear amplifier is shown to be thermal noise. The theory of linear amplifiers is applied first to the simplest, single or double oscillator model of an amplifier, and then to linear model of an amplifier with continuous fields and input and outputs. Finally it is shown that the thermal noise emi... |
2110.14310 | Mingzhe Li | Mingzhe Li, Yicen Mou, Haomin Rao, and Dehao Zhao | Gravitational leptogenesis in teleparallel and symmetric teleparallel
gravities | 7 pages, to be published in Chinese Physics C | null | 10.1088/1674-1137/ac3411 | USTC-ICTS/PCFT-21-38 | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider the possibilities of generating baryon number
asymmetry in thermal equilibrium within the frameworks of teleparallel and
symmetric teleparallel gravities. Through the derivative couplings of the
torsion scalar or the non-metricity scalar to baryons, the baryon number
asymmetry is indeed pro... | [
{
"created": "Wed, 27 Oct 2021 09:45:14 GMT",
"version": "v1"
}
] | 2022-11-09 | [
[
"Li",
"Mingzhe",
""
],
[
"Mou",
"Yicen",
""
],
[
"Rao",
"Haomin",
""
],
[
"Zhao",
"Dehao",
""
]
] | In this paper, we consider the possibilities of generating baryon number asymmetry in thermal equilibrium within the frameworks of teleparallel and symmetric teleparallel gravities. Through the derivative couplings of the torsion scalar or the non-metricity scalar to baryons, the baryon number asymmetry is indeed produ... |
1511.01869 | Vakhid Gani | Vakhid A. Gani, Alexander E. Dmitriev, Sergey G. Rubin | Two-dimensional manifold with point-like defects | 4 pages, 2 figures; Proceedings of the Conference of Fundamental
Research and Particle Physics, 18-20 February 2015, Moscow, Russian
Federation | Physics Procedia 74 (2015) 32-35 | 10.1016/j.phpro.2015.09.186 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a class of two-dimensional compact extra spaces isomorphic to the
sphere $S^2$ in the framework of multidimensional gravitation. We show that
there exists a family of stationary metrics that depend on the initial
(boundary) conditions. All these geometries have a singular point. We also
discuss the possibili... | [
{
"created": "Thu, 5 Nov 2015 19:48:23 GMT",
"version": "v1"
}
] | 2015-11-06 | [
[
"Gani",
"Vakhid A.",
""
],
[
"Dmitriev",
"Alexander E.",
""
],
[
"Rubin",
"Sergey G.",
""
]
] | We study a class of two-dimensional compact extra spaces isomorphic to the sphere $S^2$ in the framework of multidimensional gravitation. We show that there exists a family of stationary metrics that depend on the initial (boundary) conditions. All these geometries have a singular point. We also discuss the possibility... |
gr-qc/9404005 | Piotr T. Chru\'sciel | B.Berger, P.T. Chrusciel, V.Moncrief | On "asymptotically flat" space-times with $G_{2}$-invariant Cauchy
surfaces | 33 pages, Latex (with amssymbols), Garching preprint MPA 797; texing
problems corrected | Ann.Phys.237:322-354,1995 | 10.1006/aphy.1995.1012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study space-times which evolve out of Cauchy data
$(\Sigma,{}^3g,K)$ invariant under the action of a two-dimensional commutative
Lie group. Moreover $(\Sigma,{}^3g,K)$ are assumed to satisfy certain
completeness and asymptotic flatness conditions in spacelike directions. We
show that asymptotic flatn... | [
{
"created": "Wed, 6 Apr 1994 14:24:29 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Dec 2013 05:03:56 GMT",
"version": "v2"
}
] | 2013-12-19 | [
[
"Berger",
"B.",
""
],
[
"Chrusciel",
"P. T.",
""
],
[
"Moncrief",
"V.",
""
]
] | In this paper we study space-times which evolve out of Cauchy data $(\Sigma,{}^3g,K)$ invariant under the action of a two-dimensional commutative Lie group. Moreover $(\Sigma,{}^3g,K)$ are assumed to satisfy certain completeness and asymptotic flatness conditions in spacelike directions. We show that asymptotic flatnes... |
1210.0519 | Marc Casals | Marc Casals and Adrian C. Ottewill | Analytic Investigation of the Branch Cut of the Green Function in
Schwarzschild Space-time | 26 pages, 18 figures | null | 10.1103/PhysRevD.87.064010 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The retarded Green function for linear field perturbations in Schwarzschild
black hole space-time possesses a branch cut in the complex-frequency plane.
This branch cut has remained largely unexplored: only asymptotic analyses
either for small-frequency (yielding the known tail decay at late times of an
initial pertu... | [
{
"created": "Mon, 1 Oct 2012 19:37:49 GMT",
"version": "v1"
}
] | 2013-03-14 | [
[
"Casals",
"Marc",
""
],
[
"Ottewill",
"Adrian C.",
""
]
] | The retarded Green function for linear field perturbations in Schwarzschild black hole space-time possesses a branch cut in the complex-frequency plane. This branch cut has remained largely unexplored: only asymptotic analyses either for small-frequency (yielding the known tail decay at late times of an initial perturb... |
gr-qc/9901015 | Jerzy Lewandowski | Jerzy Lewandowski and Thomas Thiemann | Diffeomorphism invariant Quantum Field Theories of Connections in terms
of webs | 21 pages, 3 figurs | Class.Quant.Grav.16:2299-2322,1999 | 10.1088/0264-9381/16/7/311 | null | gr-qc | null | In the canonical quantization of gravity in terms of the Ashtekar variables
one uses paths in the 3-space to construct the quantum states. Usually, one
restricts oneself to families of paths admitting only finite number of isolated
intersections. This assumption implies a limitation on the diffeomorphisms
invariance ... | [
{
"created": "Thu, 7 Jan 1999 11:19:58 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Lewandowski",
"Jerzy",
""
],
[
"Thiemann",
"Thomas",
""
]
] | In the canonical quantization of gravity in terms of the Ashtekar variables one uses paths in the 3-space to construct the quantum states. Usually, one restricts oneself to families of paths admitting only finite number of isolated intersections. This assumption implies a limitation on the diffeomorphisms invariance of... |
2203.10740 | Hiroki Asami | Hiroki Asami and Chul-Moon Yoo | Gravothermal catastrophe and critical dimension in a $D$-dimensional
asymptotically AdS spacetime | 23 pages | null | 10.1103/PhysRevD.106.044065 | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We investigate the structure and stability of the thermal equilibrium states
of a spherically symmetric self-gravitating system in a $D$-dimensional
asymptotically Anti-de Sitter(AdS) spacetime. The system satisfies the
Einstein-Vlasov equations with a negative cosmological constant. Due to the
confined structure of ... | [
{
"created": "Mon, 21 Mar 2022 05:19:36 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Mar 2022 05:40:44 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Aug 2022 07:47:44 GMT",
"version": "v3"
}
] | 2022-09-07 | [
[
"Asami",
"Hiroki",
""
],
[
"Yoo",
"Chul-Moon",
""
]
] | We investigate the structure and stability of the thermal equilibrium states of a spherically symmetric self-gravitating system in a $D$-dimensional asymptotically Anti-de Sitter(AdS) spacetime. The system satisfies the Einstein-Vlasov equations with a negative cosmological constant. Due to the confined structure of th... |
gr-qc/9606017 | L. Sriramkumar | K. Srinivasan, L. Sriramkumar, T. Padmanabhan | `Thermal' ambience and fluctuations in classical field theory | LATEX document, 15 pages | null | null | IUCAA-18/96 | gr-qc | null | A plane monochromatic wave will not appear monochromatic to a noninertial
observer. We show that this feature leads to a `thermal' ambience in an
accelerated frame {\it even in classical field theory}. When a real,
monochromatic, mode of a scalar field is Fourier analyzed with respect to the
proper time of a uniforml... | [
{
"created": "Mon, 10 Jun 1996 09:54:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Srinivasan",
"K.",
""
],
[
"Sriramkumar",
"L.",
""
],
[
"Padmanabhan",
"T.",
""
]
] | A plane monochromatic wave will not appear monochromatic to a noninertial observer. We show that this feature leads to a `thermal' ambience in an accelerated frame {\it even in classical field theory}. When a real, monochromatic, mode of a scalar field is Fourier analyzed with respect to the proper time of a uniformly ... |
gr-qc/9805025 | Valery Rupasov | Igor Bulyzhenkov | Gravitational light bending in Euclidean space | 2 pages, Latex | null | null | null | gr-qc | null | Both the non-homogeneous slowness of electromagnetic waves in gravitational
fields and the frequency red shift contribute to the gravitational light
bending. This twofold contribution explains the measured deflection of light
rays by the Sun under Euclidean geometry of space.
| [
{
"created": "Fri, 8 May 1998 20:59:54 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Mar 2000 06:23:35 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bulyzhenkov",
"Igor",
""
]
] | Both the non-homogeneous slowness of electromagnetic waves in gravitational fields and the frequency red shift contribute to the gravitational light bending. This twofold contribution explains the measured deflection of light rays by the Sun under Euclidean geometry of space. |
2308.12155 | Anjan Kar | Anjan Kar and Sayan Kar (Indian Institute of Technology Kharagpur,
India) | Novel regular black holes: geometry, source and shadow | Matches the published version | General Relativity and Gravitation 56, 52 (2024) | 10.1007/s10714-024-03238-4 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We propose a two-parameter, static and spherically symmetric regular
geometry, which, for specific parameter values represents a regular black hole.
The matter required to support such spacetimes within the framework of General
Relativity (GR), is found to violate the energy conditions, though not in the
entire domai... | [
{
"created": "Wed, 23 Aug 2023 14:17:40 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Sep 2023 17:55:09 GMT",
"version": "v2"
},
{
"created": "Wed, 1 May 2024 10:55:23 GMT",
"version": "v3"
}
] | 2024-05-02 | [
[
"Kar",
"Anjan",
"",
"Indian Institute of Technology Kharagpur,\n India"
],
[
"Kar",
"Sayan",
"",
"Indian Institute of Technology Kharagpur,\n India"
]
] | We propose a two-parameter, static and spherically symmetric regular geometry, which, for specific parameter values represents a regular black hole. The matter required to support such spacetimes within the framework of General Relativity (GR), is found to violate the energy conditions, though not in the entire domain ... |
1707.03726 | Ernst A. Pashitskii | E.A. Pashitskii and V.I. Pentegov | On the nature of the Newton's gravitational constant and the possible
quantum-field theory of gravitation | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On the basis of the coincidence of the physical dimensions (in natural units
$\hbar = c = 1$) of the Newton's gravitational constant $G_{N} $ and the
phenomenological Fermi constant $G_{F} $ for weak interaction, it is suggested
that there is a certain similarity between weak forces, which are caused by the
exchange ... | [
{
"created": "Wed, 12 Jul 2017 14:07:46 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Jul 2017 12:04:52 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Jul 2017 12:06:45 GMT",
"version": "v3"
}
] | 2017-07-27 | [
[
"Pashitskii",
"E. A.",
""
],
[
"Pentegov",
"V. I.",
""
]
] | On the basis of the coincidence of the physical dimensions (in natural units $\hbar = c = 1$) of the Newton's gravitational constant $G_{N} $ and the phenomenological Fermi constant $G_{F} $ for weak interaction, it is suggested that there is a certain similarity between weak forces, which are caused by the exchange of... |
2009.05358 | James Lucietti | James Lucietti | All higher-dimensional Majumdar-Papapetrou black holes | 10 pages. v2: minor correction, assumption added, references added.
v3: main result stated as a theorem, published version | Ann. Henri Poincare (2021) | 10.1007/s00023-021-01037-0 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that the only asymptotically flat spacetimes with a suitably regular
event horizon, in a generalised Majumdar-Papapetrou class of solutions to
higher-dimensional Einstein-Maxwell theory, are the standard multi-black holes.
The proof involves a careful analysis of the near-horizon geometry and an
extension of... | [
{
"created": "Fri, 11 Sep 2020 11:54:05 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Sep 2020 12:57:47 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Mar 2021 10:31:29 GMT",
"version": "v3"
}
] | 2021-03-09 | [
[
"Lucietti",
"James",
""
]
] | We prove that the only asymptotically flat spacetimes with a suitably regular event horizon, in a generalised Majumdar-Papapetrou class of solutions to higher-dimensional Einstein-Maxwell theory, are the standard multi-black holes. The proof involves a careful analysis of the near-horizon geometry and an extension of t... |
2112.03307 | Seth Asante | Seth K. Asante, Bianca Dittrich | Perfect discretizations as a gateway to one-loop partition functions for
4D gravity | 22 pages | null | 10.1007/JHEP05(2022)172 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lattice actions and amplitudes that perfectly mirror continuum physics are
known as perfect discretizations. Such perfect discretizations naturally
preserve the symmetries of the continuum. This is a key concern for general
relativity, where diffeomorphism symmetry and dynamics are deeply connected,
and diffeomorphis... | [
{
"created": "Mon, 6 Dec 2021 19:02:07 GMT",
"version": "v1"
}
] | 2022-06-15 | [
[
"Asante",
"Seth K.",
""
],
[
"Dittrich",
"Bianca",
""
]
] | Lattice actions and amplitudes that perfectly mirror continuum physics are known as perfect discretizations. Such perfect discretizations naturally preserve the symmetries of the continuum. This is a key concern for general relativity, where diffeomorphism symmetry and dynamics are deeply connected, and diffeomorphisms... |
gr-qc/9207001 | null | Riccardo Capovilla | Non-Minimally Coupled Scalar Field and Ashtekar Variables | 6 pages | Phys.Rev.D46:1450-1452,1992 | 10.1103/PhysRevD.46.1450 | null | gr-qc | null | The non-minimal coupling of a scalar field is considered in the framework of
Ashtekar's new variables formulation of gravity. A first order action
functional for this system is derived in which the field variables are a tetrad
field, and an SL(2,C) connection, together with the scalar field. The tetrad
field and the ... | [
{
"created": "Mon, 20 Jul 1992 22:50:00 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Capovilla",
"Riccardo",
""
]
] | The non-minimal coupling of a scalar field is considered in the framework of Ashtekar's new variables formulation of gravity. A first order action functional for this system is derived in which the field variables are a tetrad field, and an SL(2,C) connection, together with the scalar field. The tetrad field and the SL... |
gr-qc/0203064 | Sergio Dain | Sergio Dain and Osvaldo M. Moreschi and Reinaldo J. Gleiser | Photon rockets and the Robinson-Trautman geometries | 7 pages, no figures, LaTeX2e | Class.Quant.Grav. 13 (1996) 1155-1160 | 10.1088/0264-9381/13/5/026 | null | gr-qc | null | We point out the relation between the photon rocket spacetimes and the
Robinson Trautman geometries. This allows a discussion of the issues related to
the distinction between the gravitational and matter energy radiation that
appear in these metrics in a more geometrical way, taking full advantage of
their asymptotic... | [
{
"created": "Tue, 19 Mar 2002 15:48:50 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Dain",
"Sergio",
""
],
[
"Moreschi",
"Osvaldo M.",
""
],
[
"Gleiser",
"Reinaldo J.",
""
]
] | We point out the relation between the photon rocket spacetimes and the Robinson Trautman geometries. This allows a discussion of the issues related to the distinction between the gravitational and matter energy radiation that appear in these metrics in a more geometrical way, taking full advantage of their asymptotic p... |
0905.4492 | Philip Fellman | Philip V. Fellman, Jonathan Vos Post, Christine Carmichael, Alexandru
Manus, and Dawna Lee Attig | Time, Incompleteness and Singularity in Quantum Cosmology | 14 Pages. Complex 2009. The First International Conference on Complex
Sciences: Theory and Applications, Shanghai China, February 23-25, 2009 | null | 10.1007/978-3-642-02466-5_73 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/3.0/ | In this paper we extend our 2007 paper, Comparative Quantum Cosmology:
Causality, Singularity, and Boundary Conditions, arXiv:0710.5046 to include
consideration of universal expansion, various implications of extendibility and
incompleteness in spacetime metrics and, absent the treatment of Feynman
diagrams, the use ... | [
{
"created": "Wed, 27 May 2009 19:36:37 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Fellman",
"Philip V.",
""
],
[
"Post",
"Jonathan Vos",
""
],
[
"Carmichael",
"Christine",
""
],
[
"Manus",
"Alexandru",
""
],
[
"Attig",
"Dawna Lee",
""
]
] | In this paper we extend our 2007 paper, Comparative Quantum Cosmology: Causality, Singularity, and Boundary Conditions, arXiv:0710.5046 to include consideration of universal expansion, various implications of extendibility and incompleteness in spacetime metrics and, absent the treatment of Feynman diagrams, the use of... |
2201.09588 | Christian Boehmer | Christian G. Boehmer, Erik Jensko, Ruth Lazkoz | Cosmological dynamical systems in modified gravity | 19 pages, 6 figures; v2 minor changes, updated references | Eur. Phys. J. C 82, 500 (2022) | 10.1140/epjc/s10052-022-10412-y | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The field equations of modified gravity theories, when considering a
homogeneous and isotropic cosmological model, always become autonomous
differential equations. This relies on the fact that in such models all
variables only depend on cosmological time, or another suitably chosen time
parameter. Consequently, the f... | [
{
"created": "Mon, 24 Jan 2022 10:54:52 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Feb 2022 10:30:23 GMT",
"version": "v2"
}
] | 2023-02-03 | [
[
"Boehmer",
"Christian G.",
""
],
[
"Jensko",
"Erik",
""
],
[
"Lazkoz",
"Ruth",
""
]
] | The field equations of modified gravity theories, when considering a homogeneous and isotropic cosmological model, always become autonomous differential equations. This relies on the fact that in such models all variables only depend on cosmological time, or another suitably chosen time parameter. Consequently, the fie... |
1305.6947 | J. A. Preciado Ph.D. | O. Obreg\'on, J. A. Preciado (Guanajuato U.) | A quantum cosmological model in Ho\v{r}ava-Lifshitz gravity | 5 pages, 2 figures. This work was presented at the 8th Workshop of
the Gravitation and Mathematical Physics Division of the Mexican Physical
Society, Tuxtla Gutierrez, Chiapas, Mexico, November 22-26, 2010 | AIP Conf. Proc. 1396, 151 (2011) | 10.1063/1.3647539 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A Wheeler-DeWitt equation for the Kantowski-Sachs model is derived within the
framework of the minimal quantum gravity theory proposed by Ho\v{r}ava. We
study the solution to this equation in the ultraviolet limit for the specific
case where the {\lambda} parameter of the theory takes its relativistic value
{\lambda}... | [
{
"created": "Wed, 29 May 2013 20:50:32 GMT",
"version": "v1"
}
] | 2013-05-31 | [
[
"Obregón",
"O.",
"",
"Guanajuato U."
],
[
"Preciado",
"J. A.",
"",
"Guanajuato U."
]
] | A Wheeler-DeWitt equation for the Kantowski-Sachs model is derived within the framework of the minimal quantum gravity theory proposed by Ho\v{r}ava. We study the solution to this equation in the ultraviolet limit for the specific case where the {\lambda} parameter of the theory takes its relativistic value {\lambda} =... |
2205.08448 | Qian Hu | Qian Hu and John Veitch | Assessing the model waveform accuracy of gravitational waves | 17 pages, 6 figures. Accepted by PRD | Phys. Rev. D 106, 044042 (2022) | 10.1103/PhysRevD.106.044042 | LIGO-P2200107 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | With the improvement in sensitivity of gravitational wave (GW) detectors and
the increasing diversity of GW sources, there is a strong need for accurate GW
waveform models for data analysis. While the current model accuracy assessments
require waveforms generated by numerical relativity (NR) simulations as the
"true ... | [
{
"created": "Tue, 17 May 2022 15:49:54 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Aug 2022 16:59:19 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Aug 2022 09:25:40 GMT",
"version": "v3"
}
] | 2022-08-22 | [
[
"Hu",
"Qian",
""
],
[
"Veitch",
"John",
""
]
] | With the improvement in sensitivity of gravitational wave (GW) detectors and the increasing diversity of GW sources, there is a strong need for accurate GW waveform models for data analysis. While the current model accuracy assessments require waveforms generated by numerical relativity (NR) simulations as the "true wa... |
1408.6316 | Andrei V. Frolov | Andrei V. Frolov and Valeri P. Frolov | Rigidly rotating ZAMO surfaces in the Kerr spacetime | REVTeX 4.0; 11 pages, 9 figures | Phys. Rev. D 90, 124010 (2014) | 10.1103/PhysRevD.90.124010 | Alberta-Thy-15-14, SCG-2014-02 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A stationary observer in the Kerr spacetime has zero angular momentum if
his/her angular velocity $\omega$ has a particular value, which depends on the
position of the observer. Worldlines of such zero angular momentum observers
(ZAMOs) with the same value of the angular velocity $\omega$ form a three
dimensional sur... | [
{
"created": "Wed, 27 Aug 2014 05:50:26 GMT",
"version": "v1"
}
] | 2014-12-10 | [
[
"Frolov",
"Andrei V.",
""
],
[
"Frolov",
"Valeri P.",
""
]
] | A stationary observer in the Kerr spacetime has zero angular momentum if his/her angular velocity $\omega$ has a particular value, which depends on the position of the observer. Worldlines of such zero angular momentum observers (ZAMOs) with the same value of the angular velocity $\omega$ form a three dimensional surfa... |
1401.6555 | Mariafelicia De Laurentis PhD | Salvatore Capozziello, Diego Julio Cirilo-Lombardo, Mariafelicia De
Laurentis | The Affine Structure of Gravitational Theories: Symplectic Groups and
Geometry | 21 pages. arXiv admin note: text overlap with arXiv:0910.2881,
arXiv:0705.4609 | Int. J. Geom. Methods Mod. Phys. 11, 1450081 (2014) | 10.1142/S0219887814500819 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a geometrical description of gravitational theories from the
viewpoint of symmetries and affine structure. We show how gravity, considered
as a gauge theory, can be consistently achieved by the nonlinear realization of
the conformal-affine group in an indirect manner: due the partial isomorphism
between $CA\l... | [
{
"created": "Sat, 25 Jan 2014 16:20:38 GMT",
"version": "v1"
}
] | 2014-11-13 | [
[
"Capozziello",
"Salvatore",
""
],
[
"Cirilo-Lombardo",
"Diego Julio",
""
],
[
"De Laurentis",
"Mariafelicia",
""
]
] | We give a geometrical description of gravitational theories from the viewpoint of symmetries and affine structure. We show how gravity, considered as a gauge theory, can be consistently achieved by the nonlinear realization of the conformal-affine group in an indirect manner: due the partial isomorphism between $CA\lef... |
2201.05092 | Paolo Cappuccio | Paolo Cappuccio, Ivan di Stefano, Gael Cascioli, Luciano Iess | Comparison of light-time formulations in the post-Newtonian framework
for the BepiColombo MORE experiment | null | null | 10.1088/1361-6382/ac2b0a | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ESA/JAXA BepiColombo mission, launched on 20 October 2018, is currently
in cruise toward Mercury. The Mercury Orbiter Radio-science Experiment (MORE),
one of the 16 experiments of the mission, will exploit range and range-rate
measurements collected during superior solar conjunctions to better constrain
the post-... | [
{
"created": "Thu, 13 Jan 2022 17:22:06 GMT",
"version": "v1"
}
] | 2022-01-14 | [
[
"Cappuccio",
"Paolo",
""
],
[
"di Stefano",
"Ivan",
""
],
[
"Cascioli",
"Gael",
""
],
[
"Iess",
"Luciano",
""
]
] | The ESA/JAXA BepiColombo mission, launched on 20 October 2018, is currently in cruise toward Mercury. The Mercury Orbiter Radio-science Experiment (MORE), one of the 16 experiments of the mission, will exploit range and range-rate measurements collected during superior solar conjunctions to better constrain the post-Ne... |
0908.0784 | Lars Andersson | Lars Andersson and Vincent Moncrief | Einstein spaces as attractors for the Einstein flow | 50 pages | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we prove a global existence theorem, in the direction of
cosmological expansion, for sufficiently small perturbations of a family of
$n+1$-dimensional, $n \geq 3$, spatially compact spacetimes which generalizes
the $k=-1$ Friedmann--Robertson--Walker vacuum spacetime.
Our results demonstrate causal ge... | [
{
"created": "Thu, 6 Aug 2009 17:23:17 GMT",
"version": "v1"
}
] | 2009-08-20 | [
[
"Andersson",
"Lars",
""
],
[
"Moncrief",
"Vincent",
""
]
] | In this paper we prove a global existence theorem, in the direction of cosmological expansion, for sufficiently small perturbations of a family of $n+1$-dimensional, $n \geq 3$, spatially compact spacetimes which generalizes the $k=-1$ Friedmann--Robertson--Walker vacuum spacetime. Our results demonstrate causal geodes... |
gr-qc/0505129 | Kazuyasu Shigemoto | M.Kenmoku, K.K.Nandi and K.Shigemoto | Solution Independent Analysis of Black Hole Entropy in Brick Wall Model | 19 pages | Class.Quant.Grav.22:3923-3934,2005 | 10.1088/0264-9381/22/19/008 | null | gr-qc | null | Using the brick wall regularization of 't Hooft, the entropy of non-extreme
and extreme black holes is investigated in a general static, spherically
symmetric spacetime. We classify the singularity in the entropy by introducing
a {\it new} index $\delta $ with respect to the brick wall cut-off $\epsilon $.
The leadin... | [
{
"created": "Thu, 26 May 2005 05:51:30 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Jun 2007 04:30:53 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Kenmoku",
"M.",
""
],
[
"Nandi",
"K. K.",
""
],
[
"Shigemoto",
"K.",
""
]
] | Using the brick wall regularization of 't Hooft, the entropy of non-extreme and extreme black holes is investigated in a general static, spherically symmetric spacetime. We classify the singularity in the entropy by introducing a {\it new} index $\delta $ with respect to the brick wall cut-off $\epsilon $. The leading ... |
0707.3919 | Tomas Janssen | Tomas Janssen and Tomislav Prokopec | A graviton propagator for inflation | 23 pages | Class.Quant.Grav.25:055007,2008 | 10.1088/0264-9381/25/5/055007 | ITP-UU-07/37, SPIN-07/25 | gr-qc | null | We construct the scalar and graviton propagator in quasi de Sitter space up
to first order in the slow roll parameter $\epsilon\equiv -\dot{H}/H^2$. After
a rescaling, the propagators are similar to those in de Sitter space with an
$\epsilon$ correction to the effective mass. The limit $\epsilon\to 0$
corresponds to ... | [
{
"created": "Thu, 26 Jul 2007 14:52:36 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Janssen",
"Tomas",
""
],
[
"Prokopec",
"Tomislav",
""
]
] | We construct the scalar and graviton propagator in quasi de Sitter space up to first order in the slow roll parameter $\epsilon\equiv -\dot{H}/H^2$. After a rescaling, the propagators are similar to those in de Sitter space with an $\epsilon$ correction to the effective mass. The limit $\epsilon\to 0$ corresponds to th... |
gr-qc/9706002 | Rafael D. Sorkin | Rafael D. Sorkin (ICN-UNAM and Syracuse University) | Forks in the Road, on the Way to Quantum Gravity | 29 pages, plainTeX, no figures | Int.J.Theor.Phys.36:2759-2781,1997 | 10.1007/BF02435709 | SU-GP-93-12-2 | gr-qc hep-th quant-ph | null | In seeking to arrive at a theory of ``quantum gravity'', one faces several
choices among alternative approaches. I list some of these ``forks in the
road'' and offer reasons for taking one alternative over the other. In
particular, I advocate the following: the sum-over-histories framework for
quantum dynamics over t... | [
{
"created": "Sun, 1 Jun 1997 13:55:19 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sorkin",
"Rafael D.",
"",
"ICN-UNAM and Syracuse University"
]
] | In seeking to arrive at a theory of ``quantum gravity'', one faces several choices among alternative approaches. I list some of these ``forks in the road'' and offer reasons for taking one alternative over the other. In particular, I advocate the following: the sum-over-histories framework for quantum dynamics over the... |
2303.05366 | M Blagojevi\'c | Friedrich W. Hehl | Four Lectures on Poincar\'e Gauge Field Theory | Latex, 3 figures, 51 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Poincar\'e (inhomogeneous Lorentz) group underlies special relativity. In
these lectures a consistent formalism is developed allowing an appropriate
gauging of the Poincar\'e group. The physical laws are formulated in terms of
points, orthonormal tetrad frames, and components of the matter fields with
respect to ... | [
{
"created": "Thu, 9 Mar 2023 16:13:03 GMT",
"version": "v1"
}
] | 2023-03-10 | [
[
"Hehl",
"Friedrich W.",
""
]
] | The Poincar\'e (inhomogeneous Lorentz) group underlies special relativity. In these lectures a consistent formalism is developed allowing an appropriate gauging of the Poincar\'e group. The physical laws are formulated in terms of points, orthonormal tetrad frames, and components of the matter fields with respect to th... |
1811.11021 | Francisco Jos\'e Maldonado Torralba | \'Alvaro de la Cruz-Dombriz, Francisco J. Maldonado Torralba | Birkhoff's theorem for stable torsion theories | 39 pages, 5 figures, minor corrections, conclusions unchanged. It
matches the version published in JCAP | JCAP 1903 (2019) 002 | 10.1088/1475-7516/2019/03/002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel approach to establish the Birkhoff's theorem validity in
the so-called quadratic Poincar\'e Gauge theories of gravity. By obtaining the
field equations via the Palatini formalism, we find paradigmatic scenarios
where the theorem applies neatly. For more general and physically relevant
situations, a... | [
{
"created": "Tue, 27 Nov 2018 14:28:39 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2019 15:28:01 GMT",
"version": "v2"
}
] | 2019-03-05 | [
[
"de la Cruz-Dombriz",
"Álvaro",
""
],
[
"Torralba",
"Francisco J. Maldonado",
""
]
] | We present a novel approach to establish the Birkhoff's theorem validity in the so-called quadratic Poincar\'e Gauge theories of gravity. By obtaining the field equations via the Palatini formalism, we find paradigmatic scenarios where the theorem applies neatly. For more general and physically relevant situations, a s... |
gr-qc/0410079 | Carles Bona | C. Bona, T. Ledvinka, C. Palenzuela-Luque, J.A. Pons and M. Zajeck | Gauge pathologies in singularity-avoidant spacetime foliations | 8 pages, 9 figures | null | null | null | gr-qc | null | The family of generalized-harmonic gauge conditions, which is currently used
in Numerical Relativity for its singularity-avoidant behavior, is analyzed by
looking for pathologies of the corresponding spacetime foliation. The
appearance of genuine shocks, arising from the crossing of characteristic
lines, is completel... | [
{
"created": "Mon, 18 Oct 2004 09:15:32 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Bona",
"C.",
""
],
[
"Ledvinka",
"T.",
""
],
[
"Palenzuela-Luque",
"C.",
""
],
[
"Pons",
"J. A.",
""
],
[
"Zajeck",
"M.",
""
]
] | The family of generalized-harmonic gauge conditions, which is currently used in Numerical Relativity for its singularity-avoidant behavior, is analyzed by looking for pathologies of the corresponding spacetime foliation. The appearance of genuine shocks, arising from the crossing of characteristic lines, is completely ... |
2303.02726 | Heling Deng | Heling Deng, Andrei Gruzinov, Yuri Levin and Alexander Vilenkin | Simulating cosmic string loop captured by a rotating black hole | 28 pages, 10 figures | null | 10.1103/PhysRevD.107.123016 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of a cosmic string loop captured by a rotating black
hole, ignoring string reconnections. A loop is numerically evolved in Kerr
spacetime, with the result that it turns into one or more growing or
contracting double-lines rotating around the black hole in the equatorial
plane. This is in good ag... | [
{
"created": "Sun, 5 Mar 2023 17:46:47 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Apr 2023 21:03:12 GMT",
"version": "v2"
}
] | 2023-06-28 | [
[
"Deng",
"Heling",
""
],
[
"Gruzinov",
"Andrei",
""
],
[
"Levin",
"Yuri",
""
],
[
"Vilenkin",
"Alexander",
""
]
] | We study the dynamics of a cosmic string loop captured by a rotating black hole, ignoring string reconnections. A loop is numerically evolved in Kerr spacetime, with the result that it turns into one or more growing or contracting double-lines rotating around the black hole in the equatorial plane. This is in good agre... |
0811.4235 | David P. Rideout | Song He and David Rideout | A Causal Set Black Hole | 22 pages, 9 figures, LaTeX; response to referee comments | Class.Quant.Grav. 26:125015, 2009. | 10.1088/0264-9381/26/12/125015 | pi-qg-105 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explicitly compute the causal structure of the Schwarzschild black hole
spacetime, by providing an algorithm to decide if any pair of events is
causally related. The primary motivation for this study comes from discrete
quantum gravity, in particular the causal set approach, in which the
fundamental variables can ... | [
{
"created": "Wed, 26 Nov 2008 07:11:12 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Apr 2009 20:48:34 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"He",
"Song",
""
],
[
"Rideout",
"David",
""
]
] | We explicitly compute the causal structure of the Schwarzschild black hole spacetime, by providing an algorithm to decide if any pair of events is causally related. The primary motivation for this study comes from discrete quantum gravity, in particular the causal set approach, in which the fundamental variables can be... |
1410.4481 | Emanuele Berti | Emanuele Berti | A Black-Hole Primer: Particles, Waves, Critical Phenomena and
Superradiant Instabilities | 46 pages, 10 figures. Fixed some typos and references. The other
lectures delivered at the school can be found at
http://www.dpg-physik.de/dpg/pbh/aktuelles/S214.html | null | null | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These notes were prepared for a lecture on black holes delivered at the DPG
Physics School "General Relativity @ 99" (Physikzentrum Bad Honnef, Germany,
September 2014). The common thread of the lecture is the relation between
geodesic stability and black-hole perturbations in the geometric optics limit.
Chapter 1 es... | [
{
"created": "Thu, 16 Oct 2014 16:08:55 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Oct 2014 00:39:28 GMT",
"version": "v2"
}
] | 2014-10-23 | [
[
"Berti",
"Emanuele",
""
]
] | These notes were prepared for a lecture on black holes delivered at the DPG Physics School "General Relativity @ 99" (Physikzentrum Bad Honnef, Germany, September 2014). The common thread of the lecture is the relation between geodesic stability and black-hole perturbations in the geometric optics limit. Chapter 1 esta... |
1601.04177 | Andrea Geralico | Donato Bini, Giampiero Esposito, Andrea Geralico | Late-time evolution of cosmological models with fluids obeying a
Shan-Chen-like equation of state | 18 pages, 6 figures, revtex4 macros; to appear in PRD | null | 10.1103/PhysRevD.93.023511 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Classical as well as quantum features of the late-time evolution of
cosmological models with fluids obeying a Shan-Chen-like equation of state are
studied. The latter is of the type $p=w_{\rm eff}(\rho)\,\rho$, and has been
used in previous works to describe, e.g., a possible scenario for the growth of
the dark-energ... | [
{
"created": "Sat, 16 Jan 2016 16:03:11 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Bini",
"Donato",
""
],
[
"Esposito",
"Giampiero",
""
],
[
"Geralico",
"Andrea",
""
]
] | Classical as well as quantum features of the late-time evolution of cosmological models with fluids obeying a Shan-Chen-like equation of state are studied. The latter is of the type $p=w_{\rm eff}(\rho)\,\rho$, and has been used in previous works to describe, e.g., a possible scenario for the growth of the dark-energy ... |
1510.03693 | Valery Kiselev | Ja.V.Balitsky, V.V.Kiselev | Global shift symmetry and vacuum energy of matter fields | 8 pages, 1 figure, revtex4 | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the model incorporating both an arbitrary shift of cosmological
constant and Goldstone boson corresponding to the spontaneous breaking down the
global shift symmetry in the matter action. The gravity breaks down the
symmetry explicitly and transforms the Goldstone boson to the inflaton field.
| [
{
"created": "Thu, 8 Oct 2015 08:17:26 GMT",
"version": "v1"
}
] | 2015-10-14 | [
[
"Balitsky",
"Ja. V.",
""
],
[
"Kiselev",
"V. V.",
""
]
] | We construct the model incorporating both an arbitrary shift of cosmological constant and Goldstone boson corresponding to the spontaneous breaking down the global shift symmetry in the matter action. The gravity breaks down the symmetry explicitly and transforms the Goldstone boson to the inflaton field. |
1407.7896 | Alessio Belenchia | Alessio Belenchia, Stefano Liberati, Arif Mohd | Emergent gravitational dynamics in relativistic Bose--Einstein
condensate | 23 pages, no figures, new references added and minor modifications on
the anonymous referee's feedback, this version accepted for publication in
Phys. Rev. D | Phys.Rev. D90 (2014) no.10, 104015 | 10.1103/PhysRevD.90.104015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analogue models of gravity have played a pivotal role in the past years by
providing a test bench for many open issues in quantum field theory in curved
spacetime such as the robustness of Hawking radiation and cosmological particle
production. More recently, the same models have offered a valuable framework
within w... | [
{
"created": "Tue, 29 Jul 2014 21:45:20 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Oct 2014 09:51:46 GMT",
"version": "v2"
}
] | 2018-07-19 | [
[
"Belenchia",
"Alessio",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Mohd",
"Arif",
""
]
] | Analogue models of gravity have played a pivotal role in the past years by providing a test bench for many open issues in quantum field theory in curved spacetime such as the robustness of Hawking radiation and cosmological particle production. More recently, the same models have offered a valuable framework within whi... |
2205.11445 | Fotios Anagnostopoulos | Fotios K. Anagnostopoulos, Viktor Gakis, Emmanuel N. Saridakis, Spyros
Basilakos | New models and Big Bang Nucleosynthesis constraints in $f(Q)$ gravity | 10 pages, 2 figures. To be submitted at PRD. Comments are welcome | null | 10.1140/epjc/s10052-023-11190-x | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by-sa/4.0/ | The $f(Q)$ theories of modified gravity arise from the consideration of
non-metricity as the basic geometric quantity, and have been proven to be very
efficient in describing the late-time Universe. We use the Big Bang
Nucleosynthesis (BBN) formalism and observations in order to extract
constraints on various classes... | [
{
"created": "Mon, 23 May 2022 16:35:44 GMT",
"version": "v1"
}
] | 2023-02-08 | [
[
"Anagnostopoulos",
"Fotios K.",
""
],
[
"Gakis",
"Viktor",
""
],
[
"Saridakis",
"Emmanuel N.",
""
],
[
"Basilakos",
"Spyros",
""
]
] | The $f(Q)$ theories of modified gravity arise from the consideration of non-metricity as the basic geometric quantity, and have been proven to be very efficient in describing the late-time Universe. We use the Big Bang Nucleosynthesis (BBN) formalism and observations in order to extract constraints on various classes o... |
2203.01725 | Nicholas Loutrel | Nicholas Loutrel, Richard Brito, Andrea Maselli, Paolo Pani | Inspiralling compact objects with generic deformations | 21 pages, 4 figures, journal version | Phys. Rev. D 105, 12, 124050 (2022) | 10.1103/PhysRevD.105.124050 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Self-gravitating bodies can have an arbitrarily complex shape, which implies
a much richer multipolar structure than that of a black hole in General
Relativity. With this motivation, we study the corrections to the dynamics of a
binary system due to generic, nonaxisymmetric mass quadrupole moments to
leading post-New... | [
{
"created": "Thu, 3 Mar 2022 14:15:27 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Jun 2022 10:22:12 GMT",
"version": "v2"
}
] | 2022-06-28 | [
[
"Loutrel",
"Nicholas",
""
],
[
"Brito",
"Richard",
""
],
[
"Maselli",
"Andrea",
""
],
[
"Pani",
"Paolo",
""
]
] | Self-gravitating bodies can have an arbitrarily complex shape, which implies a much richer multipolar structure than that of a black hole in General Relativity. With this motivation, we study the corrections to the dynamics of a binary system due to generic, nonaxisymmetric mass quadrupole moments to leading post-Newto... |
2006.00685 | Qing-Hua Zhu | Zhe Chang and Qing-Hua Zhu | Does the shape of the shadow of a black hole depend on motional status
of an observer? | 20 pages, 10 figures; v2: published in PRD | Phys. Rev. D 102, 044012 (2020) | 10.1103/PhysRevD.102.044012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent work on rotating black hole shadows [Phys. Rev. D{\bf 101},
084029 (2020)], we proposed a new approach for calculating size and shape of
the shadows in terms of astrometrical observables with respect to
finite-distance observers. In this paper, we introduce a distortion parameter
for the shadow shapes and... | [
{
"created": "Mon, 1 Jun 2020 03:16:46 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Aug 2020 06:31:23 GMT",
"version": "v2"
}
] | 2020-08-11 | [
[
"Chang",
"Zhe",
""
],
[
"Zhu",
"Qing-Hua",
""
]
] | In a recent work on rotating black hole shadows [Phys. Rev. D{\bf 101}, 084029 (2020)], we proposed a new approach for calculating size and shape of the shadows in terms of astrometrical observables with respect to finite-distance observers. In this paper, we introduce a distortion parameter for the shadow shapes and d... |
gr-qc/9912068 | Michael Bachmann | Michael Bachmann and Hans-Jurgen Schmidt | Period-doubling bifurcation in strongly anisotropic Bianchi I quantum
cosmology | Latest update of the paper at
http://www.physik.fu-berlin.de/~mbach/publics.html#6 | Phys.Rev. D62 (2000) 043515 | 10.1103/PhysRevD.62.043515 | null | gr-qc | null | We solve the Wheeler-DeWitt equation for the minisuperspace of a cosmological
model of Bianchi type I with a minimally coupled massive scalar field $\phi$ as
source by generalizing the calculation of Lukash and Schmidt [1]. Contrarily to
other approaches we allow strong anisotropy. Combining analytical and numerical
... | [
{
"created": "Thu, 16 Dec 1999 11:31:16 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Bachmann",
"Michael",
""
],
[
"Schmidt",
"Hans-Jurgen",
""
]
] | We solve the Wheeler-DeWitt equation for the minisuperspace of a cosmological model of Bianchi type I with a minimally coupled massive scalar field $\phi$ as source by generalizing the calculation of Lukash and Schmidt [1]. Contrarily to other approaches we allow strong anisotropy. Combining analytical and numerical me... |
1210.3004 | Yuri Bonder | Mario A. Acero and Yuri Bonder | Phenomenology of Quantum Gravity and its Possible Role in Neutrino
Anomalies | For the proceedings of "Relativity and Gravitation: 100 Years after
Einstein in Prague" (June 2012, Prague) | null | null | IUHET 570 | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | New phenomenological models of Quantum Gravity have suggested that a
Lorentz-Invariant discrete spacetime structure may become manifest through a
nonstandard coupling of matter fields and spacetime curvature. On the other
hand, there is strong experimental evidence suggesting that neutrino
oscillations cannot be desc... | [
{
"created": "Wed, 10 Oct 2012 18:54:26 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Feb 2013 17:59:56 GMT",
"version": "v2"
}
] | 2013-02-13 | [
[
"Acero",
"Mario A.",
""
],
[
"Bonder",
"Yuri",
""
]
] | New phenomenological models of Quantum Gravity have suggested that a Lorentz-Invariant discrete spacetime structure may become manifest through a nonstandard coupling of matter fields and spacetime curvature. On the other hand, there is strong experimental evidence suggesting that neutrino oscillations cannot be descri... |
gr-qc/0210025 | Mihalis Dafermos | Mihalis Dafermos | On "time-periodic" black-hole solutions to certain spherically symmetric
Einstein-matter systems | 17 pages, 5 figures | Commun.Math.Phys.238:411-427,2003 | 10.1007/s00220-003-0870-0 | null | gr-qc | null | This paper explores ``black hole'' solutions of various Einstein-wave matter
systems admitting an isometry of their domain of outer communications taking
every point to its future. In the first two parts, it is shown that such
solutions, assuming in addition that they are spherically symmetric and the
matter has a ce... | [
{
"created": "Tue, 8 Oct 2002 13:59:59 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Dafermos",
"Mihalis",
""
]
] | This paper explores ``black hole'' solutions of various Einstein-wave matter systems admitting an isometry of their domain of outer communications taking every point to its future. In the first two parts, it is shown that such solutions, assuming in addition that they are spherically symmetric and the matter has a cert... |
1403.2366 | Donato Bini | Donato Bini and Thibault Damour | Analytic determination of the eight-and-a-half post-Newtonian self-force
contributions to the two-body gravitational interaction potential | 13 pages; 1 eps figure. Revtex latex macros used | null | 10.1103/PhysRevD.89.104047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We {\it analytically} compute, to the eight-and-a-half post-Newtonian order,
and to linear order in the mass ratio, the radial potential describing (within
the effective one-body formalism) the gravitational interaction of two bodies,
thereby extending previous analytic results. These results are obtained by
applying... | [
{
"created": "Mon, 10 Mar 2014 19:48:51 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
]
] | We {\it analytically} compute, to the eight-and-a-half post-Newtonian order, and to linear order in the mass ratio, the radial potential describing (within the effective one-body formalism) the gravitational interaction of two bodies, thereby extending previous analytic results. These results are obtained by applying a... |
2011.05837 | Uwe R. Fischer | Satadal Datta, Uwe R. Fischer | Inherent nonlinearity of fluid motion and acoustic gravitational wave
memory | 10 pages, 3 figures; as published in Physical Review D | Phys. Rev. D 105, 022003 (2022) | 10.1103/PhysRevD.105.022003 | null | gr-qc cond-mat.quant-gas | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the propagation of nonlinear sound waves in a perfect fluid at
rest. By employing the Riemann wave equation of nonlinear acoustics in one
spatial dimension, it is shown that waves carrying a constant density
perturbation at their tails produce an acoustic analogue of gravitational wave
memory. For the aco... | [
{
"created": "Wed, 11 Nov 2020 15:01:15 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Oct 2021 16:39:06 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Jan 2022 17:19:34 GMT",
"version": "v3"
}
] | 2022-01-25 | [
[
"Datta",
"Satadal",
""
],
[
"Fischer",
"Uwe R.",
""
]
] | We consider the propagation of nonlinear sound waves in a perfect fluid at rest. By employing the Riemann wave equation of nonlinear acoustics in one spatial dimension, it is shown that waves carrying a constant density perturbation at their tails produce an acoustic analogue of gravitational wave memory. For the acous... |
gr-qc/9805010 | Luis J. Garay | Luis J. Garay and Guillermo A. Mena Marugan | Thiemann transform for gravity with matter fields | LaTeX 2.09, 14 pages, no figures | Class.Quant.Grav. 15 (1998) 3763-3775 | 10.1088/0264-9381/15/12/007 | null | gr-qc | null | The generalised Wick transform discovered by Thiemann provides a
well-established relation between the Euclidean and Lorentzian theories of
general relativity. We extend this Thiemann transform to the Ashtekar
formulation for gravity coupled with spin-1/2 fermions, a non-Abelian
Yang-Mills field, and a scalar field. ... | [
{
"created": "Tue, 5 May 1998 10:47:40 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Dec 1998 09:07:33 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Garay",
"Luis J.",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
]
] | The generalised Wick transform discovered by Thiemann provides a well-established relation between the Euclidean and Lorentzian theories of general relativity. We extend this Thiemann transform to the Ashtekar formulation for gravity coupled with spin-1/2 fermions, a non-Abelian Yang-Mills field, and a scalar field. It... |
1208.5251 | Laszlo Arpad Gergely | L\'aszl\'o \'A. Gergely, Peter L. Biermann | The typical mass ratio and typical final spin in supermassive black hole
mergers | 12 pages, 6 figures | null | null | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove that merging supermassive black holes (SMBHs) typically have neither
equal masses, nor is their mass ratio too extreme. The majority of such mergers
fall into the mass ratio range of 1:30 to 1:3, implying a spin flip during the
inspiral. We also present a simple expression for the final spin $\chi_{f}$ of
th... | [
{
"created": "Sun, 26 Aug 2012 20:38:39 GMT",
"version": "v1"
}
] | 2012-08-28 | [
[
"Gergely",
"László Á.",
""
],
[
"Biermann",
"Peter L.",
""
]
] | We prove that merging supermassive black holes (SMBHs) typically have neither equal masses, nor is their mass ratio too extreme. The majority of such mergers fall into the mass ratio range of 1:30 to 1:3, implying a spin flip during the inspiral. We also present a simple expression for the final spin $\chi_{f}$ of the ... |
1907.03622 | Remo Garattini | Remo Garattini | Traversable Wormholes and Yukawa Potentials | 6 pages. Contribution to the proceedings of "The Fifteenth Marcel
Grossmann Meeting on General Relativity", University of Rome "La Sapienza",
Rome, July 1-7, 2018, based on a talk delivered at the AT3 parallel session | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Traversable Wormhole are amazing astrophysical objects predicted by General
Relativity which are able to connect remote region of space-time. Even if their
existence has not been proved yet they are object of continuous investigation.
From the theoretically point of view, to exist, traversable wormholes need a
specia... | [
{
"created": "Fri, 5 Jul 2019 15:17:16 GMT",
"version": "v1"
}
] | 2019-07-09 | [
[
"Garattini",
"Remo",
""
]
] | Traversable Wormhole are amazing astrophysical objects predicted by General Relativity which are able to connect remote region of space-time. Even if their existence has not been proved yet they are object of continuous investigation. From the theoretically point of view, to exist, traversable wormholes need a special ... |
gr-qc/0702046 | Sunil Maharaj | R. Sharma, S. D. Maharaj | A class of relativistic stars with a linear equation of state | 5 pages, 3 figures, to appear in Mon. Not. R. Astron. Soc | Mon.Not.Roy.Astron.Soc.375:1265-1268,2007 | 10.1111/j.1365-2966.2006.11355.x | null | gr-qc | null | By assuming a particular mass function we find new exact solutions to the
Einstein field equations with an anisotropic matter distribution. The solutions
are shown to be relevant for the description of compact stars. A distinguishing
feature of this class of solutions is that they admit a linear equation of
state whi... | [
{
"created": "Thu, 8 Feb 2007 08:16:33 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sharma",
"R.",
""
],
[
"Maharaj",
"S. D.",
""
]
] | By assuming a particular mass function we find new exact solutions to the Einstein field equations with an anisotropic matter distribution. The solutions are shown to be relevant for the description of compact stars. A distinguishing feature of this class of solutions is that they admit a linear equation of state which... |
0802.1660 | James Lindesay | Beth A. Brown, James Lindesay | Radial Photon Trajectories Near an Evaporating Black Hole | 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The radial motion of photons emitted near the horizon of a black hole that
evaporates at a steady rate is examined. The space-time of the black hole is
generated using non-orthogonal coordinates. It is shown that some photons that
are initially drawn towards the singularity can escape falling into the
horizon. The be... | [
{
"created": "Tue, 12 Feb 2008 16:10:05 GMT",
"version": "v1"
}
] | 2008-02-13 | [
[
"Brown",
"Beth A.",
""
],
[
"Lindesay",
"James",
""
]
] | The radial motion of photons emitted near the horizon of a black hole that evaporates at a steady rate is examined. The space-time of the black hole is generated using non-orthogonal coordinates. It is shown that some photons that are initially drawn towards the singularity can escape falling into the horizon. The beha... |
2312.08458 | Vasileios Mpisketzis | Vasilis Mpisketzis, Rapha\"el Duqu\'e, Antonios Nathanail, Alejandro
Cruz-Osorio, Luciano Rezzolla | Impact of anisotropic ejecta on jet dynamics and afterglow emission in
binary neutron-star mergers | 19 pages, 9 figures. Accepted for publication in MNRAS | null | 10.1093/mnras/stad3774 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Binary neutron stars mergers widely accepted as potential progenitors of
short gamma-ray bursts. After the remnant of the merger has collapsed to a
black hole, a jet is powered and may breakout from the the matter expelled
during the collision and the subsequent wind emission. The interaction of the
jet with the ejec... | [
{
"created": "Wed, 13 Dec 2023 19:01:02 GMT",
"version": "v1"
}
] | 2023-12-15 | [
[
"Mpisketzis",
"Vasilis",
""
],
[
"Duqué",
"Raphaël",
""
],
[
"Nathanail",
"Antonios",
""
],
[
"Cruz-Osorio",
"Alejandro",
""
],
[
"Rezzolla",
"Luciano",
""
]
] | Binary neutron stars mergers widely accepted as potential progenitors of short gamma-ray bursts. After the remnant of the merger has collapsed to a black hole, a jet is powered and may breakout from the the matter expelled during the collision and the subsequent wind emission. The interaction of the jet with the ejecta... |
0710.3137 | Victor Stenger | Victor J. Stenger | A Scenario for a Natural Origin of Our Universe | 9 pages, 4 figures. Published in slightly longer form in Philo 9, no.
2 (2006): 93-102. This paper is written at about the senior physics major
level in order to reach the widest possible audience | Philo 9N2:93-102,2006 | null | null | gr-qc physics.pop-ph | null | A mathematical model of the natural origin of our universe is presented. The
model is based only on well-established physics. No claim is made that this
model uniquely represents exactly how the universe came about. But the
viability of a single model serves to refute any assertions that the universe
cannot have come... | [
{
"created": "Tue, 16 Oct 2007 17:42:59 GMT",
"version": "v1"
}
] | 2009-04-08 | [
[
"Stenger",
"Victor J.",
""
]
] | A mathematical model of the natural origin of our universe is presented. The model is based only on well-established physics. No claim is made that this model uniquely represents exactly how the universe came about. But the viability of a single model serves to refute any assertions that the universe cannot have come a... |
1006.4139 | Michele Levi | Michele Levi | Next-to-leading order gravitational spin-orbit coupling in an effective
field theory approach | 27 pages, revtex4-1, 4 figures; v2: minor editing made; v3: published | Phys.Rev.D82:104004,2010 | 10.1103/PhysRevD.82.104004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use an effective field theory (EFT) approach to calculate the next to
leading order (NLO) gravitational spin-orbit interaction between two spinning
compact objects. The NLO spin-orbit interaction provides the most
computationally complex sector of the NLO spin effects, previously derived
within the EFT approach. I... | [
{
"created": "Mon, 21 Jun 2010 19:11:31 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Jul 2010 13:55:35 GMT",
"version": "v2"
},
{
"created": "Wed, 3 Nov 2010 16:48:33 GMT",
"version": "v3"
}
] | 2010-12-03 | [
[
"Levi",
"Michele",
""
]
] | We use an effective field theory (EFT) approach to calculate the next to leading order (NLO) gravitational spin-orbit interaction between two spinning compact objects. The NLO spin-orbit interaction provides the most computationally complex sector of the NLO spin effects, previously derived within the EFT approach. In ... |
1211.6619 | Vladimir Strokov N. | V. N. Lukash, E. V. Mikheeva, and V. N. Strokov | Generation of Cosmological Flows in General Relativity (Features and
Properties of Integrable Singularities) | 21 pages, 3 figures, extended Introduction and minor changes as
compared to the published version | Phys. Usp. 55 831-837 (2012) | 10.3367/UFNe.0182.201208k.0894 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss status of the singularity problem in General Relativity and argue
that the requirement that a physical solution must be completely free of
singularities may be too strong. As an example, we consider properties of the
integrable singularities and show that they represent light horizons separating
T-regions ... | [
{
"created": "Wed, 28 Nov 2012 14:55:04 GMT",
"version": "v1"
}
] | 2012-11-29 | [
[
"Lukash",
"V. N.",
""
],
[
"Mikheeva",
"E. V.",
""
],
[
"Strokov",
"V. N.",
""
]
] | We discuss status of the singularity problem in General Relativity and argue that the requirement that a physical solution must be completely free of singularities may be too strong. As an example, we consider properties of the integrable singularities and show that they represent light horizons separating T-regions of... |
2207.05030 | Oleksandr Sobol Dr. | R. Durrer, O. Sobol, S. Vilchinskii | Magnetogenesis in Higgs-Starobinsky inflation | 20 pages, 7 figures | Physical Review D 106 (12), 123520 (2022) | 10.1103/PhysRevD.106.123520 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of mixed Higgs-Starobinsky inflation, we consider the
generation of Abelian gauge fields due to their nonminimal coupling to gravity
(in two different formulations of gravity -- metric and Palatini). We couple
the gauge-field invariants $F_{\mu\nu}F^{\mu\nu}$ and
$F_{\mu\nu}\tilde{F}^{\mu\nu}$ to an ... | [
{
"created": "Mon, 11 Jul 2022 17:33:41 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Jul 2022 22:11:58 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Dec 2022 01:23:15 GMT",
"version": "v3"
}
] | 2022-12-29 | [
[
"Durrer",
"R.",
""
],
[
"Sobol",
"O.",
""
],
[
"Vilchinskii",
"S.",
""
]
] | In the framework of mixed Higgs-Starobinsky inflation, we consider the generation of Abelian gauge fields due to their nonminimal coupling to gravity (in two different formulations of gravity -- metric and Palatini). We couple the gauge-field invariants $F_{\mu\nu}F^{\mu\nu}$ and $F_{\mu\nu}\tilde{F}^{\mu\nu}$ to an in... |
gr-qc/0611147 | Malcolm MacCallum | L. Herrera, M.A.H. MacCallum and N.O. Santos | On the Matching Conditions for the Collapsing Cylinder | Submitted to Class. Quant. Grav. as a comment | Class.Quant.Grav.24:1033,2007 | 10.1088/0264-9381/24/4/C01 | null | gr-qc | null | We review the matching conditions for a collapsing anisotropic cylindrical
perfect fluid, recently discussed in the literature (2005 {\it Class. Quantum
Grav.} {\bf 22} 2407). It is shown that radial pressure vanishes on the surface
of the cylinder, contrary to what is asserted in that reference. The origin of
this d... | [
{
"created": "Tue, 28 Nov 2006 15:54:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Herrera",
"L.",
""
],
[
"MacCallum",
"M. A. H.",
""
],
[
"Santos",
"N. O.",
""
]
] | We review the matching conditions for a collapsing anisotropic cylindrical perfect fluid, recently discussed in the literature (2005 {\it Class. Quantum Grav.} {\bf 22} 2407). It is shown that radial pressure vanishes on the surface of the cylinder, contrary to what is asserted in that reference. The origin of this dis... |
2102.12573 | Nelson Falcon Veloz | Nelson Falcon | A large-scale heuristic modification of Newtonian gravity as alternative
approach to the dark energy and dark matter | 16 pages, 7 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The peculiarities of the inverse square law of Newtonian gravity in standard
Big Bang Cosmology are discussed. It is shown that the incorporation of an
additive term to Newtonian gravitation, as the inverse Yukawa-like field,
allows remove the incompatibility between the flatness of the Universe and the
density of ma... | [
{
"created": "Tue, 23 Feb 2021 16:26:57 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Dec 2021 08:45:34 GMT",
"version": "v2"
}
] | 2021-12-28 | [
[
"Falcon",
"Nelson",
""
]
] | The peculiarities of the inverse square law of Newtonian gravity in standard Big Bang Cosmology are discussed. It is shown that the incorporation of an additive term to Newtonian gravitation, as the inverse Yukawa-like field, allows remove the incompatibility between the flatness of the Universe and the density of matt... |
gr-qc/0607062 | Ren\'e Meyer | Rene Meyer | Classical and Quantum Dilaton Gravity in Two Dimensions with Fermions | Diploma Thesis presented to the University of Leipzig (Advisor: Dr.
Daniel Grumiller), 85 pages, 1 figure | null | null | null | gr-qc hep-th | null | In this thesis the first order formulation of generalized dilaton gravities
in two dimensions coupled to a Dirac fermion is considered. After a Hamiltonian
analysis of the gauge symmetries and constraints of the theory and fixing
Eddington-Finkelstein gauge by use of the Batalin-Vilkovisky-Fradkin method,
the system ... | [
{
"created": "Mon, 17 Jul 2006 12:49:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Meyer",
"Rene",
""
]
] | In this thesis the first order formulation of generalized dilaton gravities in two dimensions coupled to a Dirac fermion is considered. After a Hamiltonian analysis of the gauge symmetries and constraints of the theory and fixing Eddington-Finkelstein gauge by use of the Batalin-Vilkovisky-Fradkin method, the system is... |
1810.08220 | Jackson Levi Said | Ismail Soudi, Gabriel Farrugia, Viktor Gakis, Jackson Levi Said,
Emmanuel N. Saridakis | Polarization of gravitational waves in symmetric teleparallel theories
of gravity and their modifications | 11 pages | Phys. Rev. D 100, 044008 (2019) | 10.1103/PhysRevD.100.044008 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Symmetric teleparallel gravity (STG) offers an interesting avenue to
formulate a theory of gravitation that relies neither on curvature nor torsion
but only on non-metricity Q. Given the growing number of observations of
gravitational waves (GWs) and their use to explore gravitational theories, in
this work we invest... | [
{
"created": "Thu, 18 Oct 2018 18:06:25 GMT",
"version": "v1"
},
{
"created": "Wed, 7 Aug 2019 08:25:15 GMT",
"version": "v2"
}
] | 2020-09-08 | [
[
"Soudi",
"Ismail",
""
],
[
"Farrugia",
"Gabriel",
""
],
[
"Gakis",
"Viktor",
""
],
[
"Said",
"Jackson Levi",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | Symmetric teleparallel gravity (STG) offers an interesting avenue to formulate a theory of gravitation that relies neither on curvature nor torsion but only on non-metricity Q. Given the growing number of observations of gravitational waves (GWs) and their use to explore gravitational theories, in this work we investig... |
1805.00807 | Alexander E. Shalyt-Margolin | Alexander Shalyt-Margolin | Minimal Length, Minimal Inverse Temperature, Measurability and Black
Holes | 27 pages. arXiv admin note: text overlap with arXiv:1709.03875 | Electronic Journal of Theoretical Physics 14, No. 37 (2018) 35--54 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The measurability notion introduced previously in a quantum theory on the
basis of a minimal length in this paper is defined in thermodynamics on the
basis of a minimal inverse temperature. Based on this notion, some inferences
are made for gravitational thermodynamics of horizon spaces and, specifically,
for black h... | [
{
"created": "Mon, 30 Apr 2018 06:29:29 GMT",
"version": "v1"
}
] | 2018-05-03 | [
[
"Shalyt-Margolin",
"Alexander",
""
]
] | The measurability notion introduced previously in a quantum theory on the basis of a minimal length in this paper is defined in thermodynamics on the basis of a minimal inverse temperature. Based on this notion, some inferences are made for gravitational thermodynamics of horizon spaces and, specifically, for black hol... |
1408.4272 | Andrea Geralico | Donato Bini, Fernando de Felice, Andrea Geralico | Charged spinning particles on circular orbits in the
Reissner-Nordstr\"om spacetime | 19 pages, 4 figures; published version. arXiv admin note: text
overlap with arXiv:gr-qc/0410082 | IJMPD 14, 1793 (2005) | 10.1142/S0218271805007358 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The behaviour of charged spinning test particles moving along circular orbits
in the equatorial plane of the Reissner-Nordstr\"om spacetime is studied in the
framework of the Dixon-Souriau model completed with standard choices of
supplementary conditions. The gravitomagnetic " clock effect", i.e. the delay
in the arr... | [
{
"created": "Tue, 19 Aug 2014 09:57:55 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"de Felice",
"Fernando",
""
],
[
"Geralico",
"Andrea",
""
]
] | The behaviour of charged spinning test particles moving along circular orbits in the equatorial plane of the Reissner-Nordstr\"om spacetime is studied in the framework of the Dixon-Souriau model completed with standard choices of supplementary conditions. The gravitomagnetic " clock effect", i.e. the delay in the arriv... |
2011.13764 | Suman Kulkarni | Suman Kulkarni and Collin D. Capano | On the reliability of parameter estimates in the first observing run of
Advanced LIGO | 11 pages, 5 figures | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accurate parameter estimation is key to maximizing the scientific impact of
gravitational-wave astronomy. Parameters of a binary merger are typically
estimated using Bayesian inference. It is necessary to make several assumptions
when doing so, one of which is that the the detectors output stationary
Gaussian noise. ... | [
{
"created": "Fri, 27 Nov 2020 14:52:24 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jun 2021 12:14:24 GMT",
"version": "v2"
}
] | 2021-06-11 | [
[
"Kulkarni",
"Suman",
""
],
[
"Capano",
"Collin D.",
""
]
] | Accurate parameter estimation is key to maximizing the scientific impact of gravitational-wave astronomy. Parameters of a binary merger are typically estimated using Bayesian inference. It is necessary to make several assumptions when doing so, one of which is that the the detectors output stationary Gaussian noise. We... |
gr-qc/9310027 | David Politzer | H. David Politzer | Path Integrals, Density Matrices, and Information Flow with Closed
Timelike Curves | 25 pages, phyzzx, CALT-68-1886 | Phys.Rev. D49 (1994) 3981-3989 | 10.1103/PhysRevD.49.3981 | null | gr-qc hep-th | null | Two formulations of quantum mechanics, inequivalent in the presence of closed
timelike curves, are studied in the context of a soluable system. It
illustrates how quantum field nonlinearities lead to a breakdown of unitarity,
causality, and superposition using a path integral. Deutsch's density matrix
approach is cau... | [
{
"created": "Tue, 19 Oct 1993 22:53:44 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Politzer",
"H. David",
""
]
] | Two formulations of quantum mechanics, inequivalent in the presence of closed timelike curves, are studied in the context of a soluable system. It illustrates how quantum field nonlinearities lead to a breakdown of unitarity, causality, and superposition using a path integral. Deutsch's density matrix approach is causa... |
gr-qc/0312070 | Marek Abramowicz A. | M.A. Abramowicz, G.J.E. Almergren, W. Kluzniak, A.V. Thampan | The Hartle-Thorne circular geodesics | 9 pages | null | null | null | gr-qc | null | The Hartle-Thorne metric is an exact solution of vacuum Einstein field
equations that describes the exterior of any slowly and rigidly rotating,
stationary and axially symmetric body. The metric is given with accuracy up to
the second order terms in the body's angular momentum, and first order in its
quadrupole momen... | [
{
"created": "Mon, 15 Dec 2003 22:47:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Abramowicz",
"M. A.",
""
],
[
"Almergren",
"G. J. E.",
""
],
[
"Kluzniak",
"W.",
""
],
[
"Thampan",
"A. V.",
""
]
] | The Hartle-Thorne metric is an exact solution of vacuum Einstein field equations that describes the exterior of any slowly and rigidly rotating, stationary and axially symmetric body. The metric is given with accuracy up to the second order terms in the body's angular momentum, and first order in its quadrupole moment.... |
gr-qc/9705036 | Palii Yurii | S. A. Gogilidze, A. M. Khvedelidze, V. V. Papoyan, Yu.G.Palii, V. N.
Pervushin | Dirac and Friedmann Observables in Quantum Universe with Radiation | 18 pages, LaTex | Grav.Cosmol. 3 (1997) 17-23 | null | null | gr-qc | null | Relations between the Friedmann observables of the expanding Universe and the
Dirac observables in the generalized Hamiltonian approach are established for
the Friedmann cosmological model of the Universe with the field excitations
imitating radiation. A full separation of the physical sector from the gauge
one is fu... | [
{
"created": "Wed, 14 May 1997 08:56:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gogilidze",
"S. A.",
""
],
[
"Khvedelidze",
"A. M.",
""
],
[
"Papoyan",
"V. V.",
""
],
[
"Palii",
"Yu. G.",
""
],
[
"Pervushin",
"V. N.",
""
]
] | Relations between the Friedmann observables of the expanding Universe and the Dirac observables in the generalized Hamiltonian approach are established for the Friedmann cosmological model of the Universe with the field excitations imitating radiation. A full separation of the physical sector from the gauge one is fulf... |
2406.04392 | Naman Kumar | Naman Kumar | On the Accelerated Expansion of the Universe | published version, comments are welcome, covered in phys.org:
https://phys.org/news/2024-06-partner-anti-universe-expansion-dark.html | Gravit. Cosmol. 30, 85-88 (2024) | 10.1134/S0202289324010080 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If we look at from a quantum perspective, the most natural way in which the
universe can be created is in entangled pairs whose time flow is oppositely
related. This suggests the idea of the creation of a universe-antiuniverse
pair. Assuming the validity of this hypothesis, in this paper, we show that the
universe ex... | [
{
"created": "Thu, 6 Jun 2024 17:59:08 GMT",
"version": "v1"
}
] | 2024-06-10 | [
[
"Kumar",
"Naman",
""
]
] | If we look at from a quantum perspective, the most natural way in which the universe can be created is in entangled pairs whose time flow is oppositely related. This suggests the idea of the creation of a universe-antiuniverse pair. Assuming the validity of this hypothesis, in this paper, we show that the universe expa... |
1205.7063 | Henric Krawczynski | Henric Krawczynski (Washington University in St. Louis) | Tests of General Relativity in the Strong Gravity Regime Based on X-Ray
Spectropolarimetric Observations of Black Holes in X-Ray Binaries | 27 pages, 8 figures, accepted for publication in the Astrophysical
Journal | null | 10.1088/0004-637X/754/2/133 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although General Relativity (GR) has been tested extensively in the weak
gravity regime, similar tests in the strong gravity regime are still missing.
In this paper we explore the possibility to use X-ray spectropolarimetric
observations of black holes in X-ray binaries to distinguish between the Kerr
metric and the ... | [
{
"created": "Thu, 31 May 2012 18:36:12 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Krawczynski",
"Henric",
"",
"Washington University in St. Louis"
]
] | Although General Relativity (GR) has been tested extensively in the weak gravity regime, similar tests in the strong gravity regime are still missing. In this paper we explore the possibility to use X-ray spectropolarimetric observations of black holes in X-ray binaries to distinguish between the Kerr metric and the ph... |
2204.13948 | Guangzhou Guo | Guangzhou Guo, Xin Jiang, Peng Wang, Houwen Wu | Gravitational Lensing by Black Holes with Multiple Photon Spheres | 21 pages, 6 figures, references added | null | 10.1103/PhysRevD.105.124064 | CTP-SCU/2022007 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study gravitational lensing of light by hairy black holes, which, in a
certain parameter regime, can possess two photon spheres of different size
outside the event horizon. In particular, we focus on higher-order images of a
point-like light source and a luminous celestial sphere produced by strong
gravitational l... | [
{
"created": "Fri, 29 Apr 2022 08:47:56 GMT",
"version": "v1"
},
{
"created": "Sat, 7 May 2022 15:06:32 GMT",
"version": "v2"
}
] | 2022-07-13 | [
[
"Guo",
"Guangzhou",
""
],
[
"Jiang",
"Xin",
""
],
[
"Wang",
"Peng",
""
],
[
"Wu",
"Houwen",
""
]
] | We study gravitational lensing of light by hairy black holes, which, in a certain parameter regime, can possess two photon spheres of different size outside the event horizon. In particular, we focus on higher-order images of a point-like light source and a luminous celestial sphere produced by strong gravitational len... |
1203.4210 | Alexander Burinskii | Alexander Burinskii | Complex structure of Kerr-Schild geometry: Calabi-Yau twofold from the
Kerr theorem | 9 pages, 3 figures. Essay written for the Gravity Research Foundation
2012 Awards for Essays on Gravitation | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Newman's representation of the Kerr geometry as a complex
retarded-time construction generated by a source propagating along a complex
world-line. We notice that the complex world-line forms really an open complex
string, endpoints of which should have independent dynamics by the string
excitations. The a... | [
{
"created": "Mon, 19 Mar 2012 19:26:15 GMT",
"version": "v1"
}
] | 2012-03-20 | [
[
"Burinskii",
"Alexander",
""
]
] | We consider Newman's representation of the Kerr geometry as a complex retarded-time construction generated by a source propagating along a complex world-line. We notice that the complex world-line forms really an open complex string, endpoints of which should have independent dynamics by the string excitations. The adj... |
1503.02981 | Steven Carlip | S. Carlip | Four-Dimensional Entropy from Three-Dimensional Gravity | 8 pages; v2: more references, typos fixed, minor rewording; v3: some
clearer explanations in response to referees, more references | Phys. Rev. Lett. 115, 071302 (2015) | 10.1103/PhysRevLett.115.071302 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | At the horizon of a black hole, the action of (3+1)-dimensional loop quantum
gravity acquires a boundary term that is formally identical to an action for
three-dimensional gravity. I show how to use this correspondence to obtain the
entropy of the (3+1)-dimensional black hole from well-understood conformal
field theo... | [
{
"created": "Tue, 10 Mar 2015 16:32:44 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Mar 2015 20:23:52 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Jul 2015 22:38:04 GMT",
"version": "v3"
}
] | 2015-08-19 | [
[
"Carlip",
"S.",
""
]
] | At the horizon of a black hole, the action of (3+1)-dimensional loop quantum gravity acquires a boundary term that is formally identical to an action for three-dimensional gravity. I show how to use this correspondence to obtain the entropy of the (3+1)-dimensional black hole from well-understood conformal field theory... |
1810.02115 | Kunihiko Hasegawa | Kunihiko Hasegawa, Tomotada Akutsu, Nobuhiro Kimura, Yoshio Saito,
Toshikazu Suzuki, Takayuki Tomaru, Ayako Ueda, and Shinji Miyoki | Molecular adsorbed layer formation on cooled mirrors and its impacts on
cryogenic gravitational wave telescopes | 11 pages, 13 figures | Phys. Rev. D 99, 022003 (2019) | 10.1103/PhysRevD.99.022003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cryogenic mirrors have been introduced to the KAGRA gravitational wave
telescope in Japan, and are also planned to be used in next-generation
gravitational wave telescopes to further improve their sensitivity. Molecular
gases inside vacuum chambers adhere to cold mirror surfaces because they lose
their kinetic energy... | [
{
"created": "Thu, 4 Oct 2018 09:20:57 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Dec 2018 04:59:01 GMT",
"version": "v2"
}
] | 2019-02-06 | [
[
"Hasegawa",
"Kunihiko",
""
],
[
"Akutsu",
"Tomotada",
""
],
[
"Kimura",
"Nobuhiro",
""
],
[
"Saito",
"Yoshio",
""
],
[
"Suzuki",
"Toshikazu",
""
],
[
"Tomaru",
"Takayuki",
""
],
[
"Ueda",
"Ayako",
""
],
... | Cryogenic mirrors have been introduced to the KAGRA gravitational wave telescope in Japan, and are also planned to be used in next-generation gravitational wave telescopes to further improve their sensitivity. Molecular gases inside vacuum chambers adhere to cold mirror surfaces because they lose their kinetic energy w... |
gr-qc/0310036 | Robert Spero | Robert Spero, Andreas Kuhnert | The ST7 Interferometer | 11 pages, 5 figures including 1 photo, for special issue of
"Classical and Quantum Gravity," proceedings of Amaldi 5 | Class.Quant.Grav. 21 (2004) S589-S596 | 10.1088/0264-9381/21/5/030 | null | gr-qc | null | Two homodyne Michelson interferferometers aboard the LISA Pathfinder
spacecraft will measure the the positions of two free-floating test masses, as
part of the NASA ST7 mission. The interferometer is required to measure the
separation between the test masses with sensitivity of 30 pm/sqrt(Hz) at 10
mHz. The readout s... | [
{
"created": "Tue, 7 Oct 2003 01:28:16 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Spero",
"Robert",
""
],
[
"Kuhnert",
"Andreas",
""
]
] | Two homodyne Michelson interferferometers aboard the LISA Pathfinder spacecraft will measure the the positions of two free-floating test masses, as part of the NASA ST7 mission. The interferometer is required to measure the separation between the test masses with sensitivity of 30 pm/sqrt(Hz) at 10 mHz. The readout sch... |
gr-qc/0108040 | Steven Carlip | S. Carlip | Quantum Gravity: a Progress Report | 72 pages, 5 figures; review solicited by Reports on Progress in
Physics, http://www.iop.org/Journals/RoPP | Rept.Prog.Phys.64:885,2001 | 10.1088/0034-4885/64/8/301 | UCD-2001-04 | gr-qc hep-th | null | The problem of reconciling general relativity and quantum theory has
fascinated and bedeviled physicists for more than 70 years. Despite recent
progress in string theory and loop quantum gravity, a complete solution remains
out of reach. I review the status of the continuing effort to quantize gravity,
emphasizing th... | [
{
"created": "Tue, 14 Aug 2001 18:01:55 GMT",
"version": "v1"
}
] | 2010-04-28 | [
[
"Carlip",
"S.",
""
]
] | The problem of reconciling general relativity and quantum theory has fascinated and bedeviled physicists for more than 70 years. Despite recent progress in string theory and loop quantum gravity, a complete solution remains out of reach. I review the status of the continuing effort to quantize gravity, emphasizing the ... |
1408.5232 | Ahmet Baykal | Ahmet Baykal | An alternative derivation of the Minimal massive 3D gravity | 12 pages in IOP article format, improved presentation with minor
corrections, an appendix added | Class. Quantum Grav. 32 (2015) 025013 | 10.1088/0264-9381/32/2/025013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using the algebra of exterior forms and the first order formalism with
constraints, an alternative derivation of the field equations for the Minimal
massive 3D gravity model is presented.
| [
{
"created": "Fri, 22 Aug 2014 09:05:04 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Dec 2014 08:11:58 GMT",
"version": "v2"
}
] | 2014-12-24 | [
[
"Baykal",
"Ahmet",
""
]
] | By using the algebra of exterior forms and the first order formalism with constraints, an alternative derivation of the field equations for the Minimal massive 3D gravity model is presented. |
2306.06937 | Riccardo Della Monica | Rebeca Fern\'andez Fern\'andez, Riccardo Della Monica, Ivan de Martino | Constraining an Einstein-Maxwell-dilaton-axion black hole at the
Galactic Center with the orbit of the S2 star | 17 pages, 5 figures, 2 tables. Comments are welcome | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive new constraints on the dilaton parameter appearing in the
spherically-symmetric black hole solution of Einstein-Maxwell-dilaton-axion
gravity, by studying the geodesic motion of the S2 star in the Galactic Center.
Einstein-Maxwell-dilaton-axion black holes represent a compelling alternative
to the standard ... | [
{
"created": "Mon, 12 Jun 2023 08:14:42 GMT",
"version": "v1"
}
] | 2023-06-13 | [
[
"Fernández",
"Rebeca Fernández",
""
],
[
"Della Monica",
"Riccardo",
""
],
[
"de Martino",
"Ivan",
""
]
] | We derive new constraints on the dilaton parameter appearing in the spherically-symmetric black hole solution of Einstein-Maxwell-dilaton-axion gravity, by studying the geodesic motion of the S2 star in the Galactic Center. Einstein-Maxwell-dilaton-axion black holes represent a compelling alternative to the standard bl... |
gr-qc/0312033 | Dieter Brill | Dieter R. Brill | Lattice Universes in 2+1-dimensional gravity | 14 pages 7 figures, to appear in Festschrift for Vince Moncrief (CQG) | Class.Quant.Grav. 21 (2004) S97-S108 | 10.1088/0264-9381/21/3/007 | null | gr-qc | null | Lattice universes are spatially closed space-times of spherical topology in
the large, containing masses or black holes arranged in the symmetry of a
regular polygon or polytope. Exact solutions for such spacetimes are found in
2+1 dimensions for Einstein gravity with a non-positive cosmological constant.
By means of... | [
{
"created": "Thu, 4 Dec 2003 23:20:55 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Brill",
"Dieter R.",
""
]
] | Lattice universes are spatially closed space-times of spherical topology in the large, containing masses or black holes arranged in the symmetry of a regular polygon or polytope. Exact solutions for such spacetimes are found in 2+1 dimensions for Einstein gravity with a non-positive cosmological constant. By means of a... |
gr-qc/0604045 | Carlo Rovelli | Carlo Rovelli | Unfinished revolution | 8 pages. Version 2: minor corrections | null | null | null | gr-qc hep-th | null | Introductive chapter of a book on Quantum Gravity, edited by Daniele Oriti,
to appear with Cambridge University Press.
| [
{
"created": "Mon, 10 Apr 2006 13:06:39 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Apr 2006 07:55:42 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Rovelli",
"Carlo",
""
]
] | Introductive chapter of a book on Quantum Gravity, edited by Daniele Oriti, to appear with Cambridge University Press. |
gr-qc/0110121 | Duncan Noltingk | D. Noltingk | BRST Quantisation of Histories Electrodynamics | Introductory material on BRST methods expanded and mistake corrected
in final section. To appear in Journ Math Phys | J.Math.Phys. 43 (2002) 4801-4818 | 10.1063/1.1503867 | null | gr-qc | null | This paper is a continuation of earlier work where a classical history theory
of pure electrodynamics was developed in which the the history fields have
\emph{five} components. The extra component is associated with an extra
constraint, thus enlarging the gauge group of histories electrodynamics. In
this paper we qua... | [
{
"created": "Mon, 29 Oct 2001 13:32:55 GMT",
"version": "v1"
},
{
"created": "Sun, 19 May 2002 16:36:44 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Noltingk",
"D.",
""
]
] | This paper is a continuation of earlier work where a classical history theory of pure electrodynamics was developed in which the the history fields have \emph{five} components. The extra component is associated with an extra constraint, thus enlarging the gauge group of histories electrodynamics. In this paper we quant... |
2012.12158 | Daniel Hartwig | Daniel Hartwig, Jan Petermann, Roman Schnabel | Mechanical parametric feedback-cooling for pendulum-based gravity
experiments | 5 pages, 4 figures, submitted to Physical Review Letters, replaced
original version to include missing acknowledgment | null | null | null | gr-qc physics.ins-det | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational forces that oscillate at audio-band frequencies are measured
with masses suspended as pendulums that have resonance frequencies even lower.
If the pendulum is excited by thermal energy or by seismic motion of the
environment, the measurement sensitivity is reduced. Conventionally, this
problem is mitiga... | [
{
"created": "Tue, 22 Dec 2020 16:47:44 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Feb 2021 17:31:24 GMT",
"version": "v2"
}
] | 2021-02-18 | [
[
"Hartwig",
"Daniel",
""
],
[
"Petermann",
"Jan",
""
],
[
"Schnabel",
"Roman",
""
]
] | Gravitational forces that oscillate at audio-band frequencies are measured with masses suspended as pendulums that have resonance frequencies even lower. If the pendulum is excited by thermal energy or by seismic motion of the environment, the measurement sensitivity is reduced. Conventionally, this problem is mitigate... |
1903.08312 | Yun Soo Myung | Yun Soo Myung, De-Cheng Zou | Black holes in Gauss-Bonnet and Chern-Simons-scalar theory | 18 pages, 2 figures, version to appear in IJMPD | null | 10.1142/S0218271819501141 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We carry out the stability analysis of the Schwarzschild black hole in
Gauss-Bonnet and Chern-Simons-scalar theory. Here, we introduce two quadratic
scalar couplings ($\phi_1^2,\phi_2^2$) to Gauss-Bonnet and Chern-Simons terms,
where the former term is parity-even, while the latter one is parity-odd. The
perturbation... | [
{
"created": "Wed, 20 Mar 2019 01:59:13 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Mar 2019 00:39:35 GMT",
"version": "v2"
}
] | 2019-07-24 | [
[
"Myung",
"Yun Soo",
""
],
[
"Zou",
"De-Cheng",
""
]
] | We carry out the stability analysis of the Schwarzschild black hole in Gauss-Bonnet and Chern-Simons-scalar theory. Here, we introduce two quadratic scalar couplings ($\phi_1^2,\phi_2^2$) to Gauss-Bonnet and Chern-Simons terms, where the former term is parity-even, while the latter one is parity-odd. The perturbation e... |
2108.00494 | James B. Hartle | James B. Hartle (University of California, Santa Barbara) | Prediction in Quantum Cosmology | 34 pages, 5 figures | null | null | null | gr-qc astro-ph.CO hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lectures by the author at the 1986 Cargese summer school modestly corrected
and uploaded for greater accessibility. Some of the author's views on the
quantum mechanics of cosmology have changed from those presented here but may
still be of historical interest. The material on the Born-Oppenheimer
approximation for so... | [
{
"created": "Sun, 1 Aug 2021 17:07:46 GMT",
"version": "v1"
}
] | 2021-08-03 | [
[
"Hartle",
"James B.",
"",
"University of California, Santa Barbara"
]
] | Lectures by the author at the 1986 Cargese summer school modestly corrected and uploaded for greater accessibility. Some of the author's views on the quantum mechanics of cosmology have changed from those presented here but may still be of historical interest. The material on the Born-Oppenheimer approximation for solv... |
2104.09209 | Felix Spengler | Felix Spengler, Dennis R\"atzel and Daniel Braun | Perspectives of measuring gravitational effects of laser light and
particle beams | Main Text: 23 pages, 1 figure. Appendix: 7 pages, 2 figures | New J. Phys. 24 053021 (2022) | 10.1088/1367-2630/ac5372 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study possibilities of creation and detection of oscillating gravitational
fields from lab-scale high energy, relativistic sources. The sources considered
are high energy laser beams in an optical cavity and the ultra-relativistic
proton bunches circulating in the beam of the Large Hadron Collider (LHC) at
CERN. T... | [
{
"created": "Mon, 19 Apr 2021 11:11:13 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Apr 2021 17:46:24 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Jul 2021 15:54:15 GMT",
"version": "v3"
},
{
"created": "Sun, 15 May 2022 15:17:52 GMT",
"version": "v4"
},
{
"cr... | 2022-05-25 | [
[
"Spengler",
"Felix",
""
],
[
"Rätzel",
"Dennis",
""
],
[
"Braun",
"Daniel",
""
]
] | We study possibilities of creation and detection of oscillating gravitational fields from lab-scale high energy, relativistic sources. The sources considered are high energy laser beams in an optical cavity and the ultra-relativistic proton bunches circulating in the beam of the Large Hadron Collider (LHC) at CERN. The... |
0910.2054 | Roberto Chan | R. Chan, M.F.A. da Silva and P. Rocha | How the Cosmological Constant Affects Gravastar Formation | 36 pages and 23 figures, correcting some typos and clarifying some
points, accepted for publication in JCAP | JCAP 0912:017,2009 | 10.1088/1475-7516/2009/12/017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we generalized a previous model of gravastar consisted of an internal de
Sitter spacetime, a dynamical infinitely thin shell with an equation of state,
but now we consider an external de Sitter-Schwarzschild spacetime. We have
shown explicitly that the final output can be a black hole, a "bounded
excursion" stab... | [
{
"created": "Sun, 11 Oct 2009 21:59:57 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Dec 2009 18:20:57 GMT",
"version": "v2"
}
] | 2012-10-25 | [
[
"Chan",
"R.",
""
],
[
"da Silva",
"M. F. A.",
""
],
[
"Rocha",
"P.",
""
]
] | Here we generalized a previous model of gravastar consisted of an internal de Sitter spacetime, a dynamical infinitely thin shell with an equation of state, but now we consider an external de Sitter-Schwarzschild spacetime. We have shown explicitly that the final output can be a black hole, a "bounded excursion" stable... |
1707.09180 | Gabor Etesi | Gabor Etesi | Exotica and the status of the strong cosmic censor conjecture in four
dimensions | 24 pages, 2 figures, LaTeX; published version with an extra "Footnote
3" on p. 10. This work is partly based on arXiv:1503.04945 [gr-qc] | Class. Quantum Grav. 34, No. 24, 245010-1-245010-26 (2017) | 10.1088/1361-6382/aa945b | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An immense class of physical counterexamples to the four dimensional strong
cosmic censor conjecture---in its usual broad formulation---is exhibited. More
precisely, out of any closed and simply connected 4-manifold an open Ricci-flat
Lorentzian 4-manifold is constructed which is not globally hyperbolic and no
pertur... | [
{
"created": "Fri, 28 Jul 2017 10:34:40 GMT",
"version": "v1"
},
{
"created": "Wed, 29 Nov 2017 10:12:43 GMT",
"version": "v2"
},
{
"created": "Fri, 28 Sep 2018 10:57:43 GMT",
"version": "v3"
}
] | 2018-10-01 | [
[
"Etesi",
"Gabor",
""
]
] | An immense class of physical counterexamples to the four dimensional strong cosmic censor conjecture---in its usual broad formulation---is exhibited. More precisely, out of any closed and simply connected 4-manifold an open Ricci-flat Lorentzian 4-manifold is constructed which is not globally hyperbolic and no perturba... |
1310.1322 | Roland Steinbauer | Alexander Lecke, Roland Steinbauer, Robert Svarc | The regularity of geodesics in impulsive pp-waves | final version, minor changes, reference added | Gen. Relativ. Gravit. 46, 1648, 8p, 2014 | 10.1007/s10714-013-1648-0 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the geodesic equation in impulsive pp-wave space-times in Rosen
form, where the metric is of Lipschitz regularity. We prove that the geodesics
(in the sense of Caratheodory) are actually continuously differentiable,
thereby rigorously justifying the $C^1$-matching procedure which has been used
in the lite... | [
{
"created": "Fri, 4 Oct 2013 15:38:34 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Feb 2014 19:28:04 GMT",
"version": "v2"
}
] | 2014-02-24 | [
[
"Lecke",
"Alexander",
""
],
[
"Steinbauer",
"Roland",
""
],
[
"Svarc",
"Robert",
""
]
] | We consider the geodesic equation in impulsive pp-wave space-times in Rosen form, where the metric is of Lipschitz regularity. We prove that the geodesics (in the sense of Caratheodory) are actually continuously differentiable, thereby rigorously justifying the $C^1$-matching procedure which has been used in the litera... |
gr-qc/0410067 | Sugumi Kanno | Sugumi Kanno, Jiro Soda | On The Higher Codimension Braneworld | Talk given at Gamov Memorial International Conference, Odessa,
Ukraine, August 8-14, 2004; 4 pages | null | null | null | gr-qc | null | We study a codimension 2 braneworld in the Einstein-Gauss-Bonnet gravity. In
the linear regime, we show the conventional Einstein gravity can be recovered
on the brane. While, in the nonlinear regime, we find corrections due to the
thickness and the bulk geometry.
| [
{
"created": "Fri, 15 Oct 2004 09:41:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kanno",
"Sugumi",
""
],
[
"Soda",
"Jiro",
""
]
] | We study a codimension 2 braneworld in the Einstein-Gauss-Bonnet gravity. In the linear regime, we show the conventional Einstein gravity can be recovered on the brane. While, in the nonlinear regime, we find corrections due to the thickness and the bulk geometry. |
1305.0653 | Przemyslaw Malkiewicz | Herve Bergeron, Andrea Dapor, Jean Pierre Gazeau and Przemyslaw
Malkiewicz | Smooth Big Bounce from Affine Quantization | 22+9 pages, 3 figures | Phys. Rev. D 89, 083522 (2014) | 10.1103/PhysRevD.89.083522 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the possibility of dealing with gravitational singularities on a
quantum level through the use of coherent state or wavelet quantization instead
of canonical quantization. We consider the Robertson-Walker metric coupled to a
perfect fluid. It is the simplest model of a gravitational collapse and the
result... | [
{
"created": "Fri, 3 May 2013 09:40:53 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 2013 07:30:21 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Jun 2013 19:41:17 GMT",
"version": "v3"
},
{
"created": "Tue, 28 Jan 2014 13:42:55 GMT",
"version": "v4"
}
] | 2015-06-15 | [
[
"Bergeron",
"Herve",
""
],
[
"Dapor",
"Andrea",
""
],
[
"Gazeau",
"Jean Pierre",
""
],
[
"Malkiewicz",
"Przemyslaw",
""
]
] | We examine the possibility of dealing with gravitational singularities on a quantum level through the use of coherent state or wavelet quantization instead of canonical quantization. We consider the Robertson-Walker metric coupled to a perfect fluid. It is the simplest model of a gravitational collapse and the results ... |
2405.10585 | Omar Mustafa | Omar Mustafa | KG-oscillators in Som-Raychaudhuri rotating cosmic string spacetime in a
mixed magnetic field | 10 pages, 2 figures | Nucl. Phys. B 1006 (2024) 116629 | 10.1016/j.nuclphysb.2024.116629 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We investigate Klein-Gordon (KG) oscillators in a G\"{o}% del-type
Som-Raychaudhuri spacetime in a mixed magnetic field (given by the vector
potential $A_{\mu }=\left( 0,0,A_{\varphi },0\right) $, with $% A_{\varphi
}=B_{1}r^{2}/2+B_{2}r$). The resulting KG equation takes a Schr%
\"{o}dinger-like form (with an oscill... | [
{
"created": "Fri, 17 May 2024 07:19:46 GMT",
"version": "v1"
}
] | 2024-08-01 | [
[
"Mustafa",
"Omar",
""
]
] | We investigate Klein-Gordon (KG) oscillators in a G\"{o}% del-type Som-Raychaudhuri spacetime in a mixed magnetic field (given by the vector potential $A_{\mu }=\left( 0,0,A_{\varphi },0\right) $, with $% A_{\varphi }=B_{1}r^{2}/2+B_{2}r$). The resulting KG equation takes a Schr% \"{o}dinger-like form (with an oscillat... |
1404.0778 | Davood Momeni Dr | Davood Momeni, Ratbay Myrzakulov | Conformal Invariant Teleparallel Cosmology | Revised version; References added,Accepted for publication in The
"European Physical Journal - Plus" | Eur. Phys. J. Plus (2014) 129: 137 | 10.1140/epjp/i2014-14137-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study teleparallel gravitational theories with are invariant under the
conformal transformations. Wide family of the gravitational Lagrangians that
are invariant under conformal transformations have investigated. Cosmological
solutions inspired by the observational data for a flat Universe in the vacuum
has been f... | [
{
"created": "Thu, 3 Apr 2014 06:49:46 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jun 2014 15:47:03 GMT",
"version": "v2"
}
] | 2014-06-24 | [
[
"Momeni",
"Davood",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] | We study teleparallel gravitational theories with are invariant under the conformal transformations. Wide family of the gravitational Lagrangians that are invariant under conformal transformations have investigated. Cosmological solutions inspired by the observational data for a flat Universe in the vacuum has been fou... |
1504.06941 | Edwin J. Son | Edwin J. Son and Wontae Kim | Note on uncertainty relations in doubly special relativity and rainbow
gravity | 7 pages | Mod. Phys. Lett. A, Vol. 30, No. 33 (2015) 1550178 | 10.1142/S0217732315501783 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present commutation relations depending on the rainbow functions which are
slightly different from the well-known results. However, the advantage of these
new commutation relations are compatible with the calculation of the Hawking
temperature in the rainbow Schwarzschild black hole.
| [
{
"created": "Mon, 27 Apr 2015 06:11:18 GMT",
"version": "v1"
}
] | 2015-09-30 | [
[
"Son",
"Edwin J.",
""
],
[
"Kim",
"Wontae",
""
]
] | We present commutation relations depending on the rainbow functions which are slightly different from the well-known results. However, the advantage of these new commutation relations are compatible with the calculation of the Hawking temperature in the rainbow Schwarzschild black hole. |
gr-qc/0003053 | Gorbatsievich Alexander K. | A.K.Gorbatsievich | On the Axiomatics of the 5-dimensional Projective Unified Field Theory
of Schmutzer | 32 pages, 1 figure, LaTeX 2e, will be submitted to Genaral Relativity
and Gravitation | Gen.Rel.Grav. 33 (2001) 965-998 | 10.1023/A:1010220113388 | null | gr-qc | null | For more than 40 years E.Schmutzer has developed a new approach to the
(5-dimensional) projective relativistic theory which he later called Projective
Unified Field Theory (PUFT). In the present paper we introduce a new axiomatics
for Schmutzer's theory. By means of this axiomatics we can give a new
geometrical inter... | [
{
"created": "Tue, 14 Mar 2000 09:12:40 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Gorbatsievich",
"A. K.",
""
]
] | For more than 40 years E.Schmutzer has developed a new approach to the (5-dimensional) projective relativistic theory which he later called Projective Unified Field Theory (PUFT). In the present paper we introduce a new axiomatics for Schmutzer's theory. By means of this axiomatics we can give a new geometrical interpr... |
2208.08702 | Siyuan Ma | Siyuan Ma and Lin Zhang | Precise late-time asymptotics of scalar field in the interior of a
subextreme Kerr black hole and its application in Strong Cosmic Censorship
conjecture | Compatible with the version that will appear in Transaction of the
AMS | Transaction of the AMS, 2023 | null | null | gr-qc math.AP | http://creativecommons.org/publicdomain/zero/1.0/ | In this work, we compute the precise late-time asymptotics for the scalar
field in the interior of a non-static subextreme Kerr black hole, based on
recent progress on deriving its precise asymptotics in the Kerr exterior
region. This provides a new proof of the generic
$H^1_{\text{loc}}$-inextendibility of the Kerr ... | [
{
"created": "Thu, 18 Aug 2022 08:26:49 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2023 02:50:24 GMT",
"version": "v2"
}
] | 2023-07-06 | [
[
"Ma",
"Siyuan",
""
],
[
"Zhang",
"Lin",
""
]
] | In this work, we compute the precise late-time asymptotics for the scalar field in the interior of a non-static subextreme Kerr black hole, based on recent progress on deriving its precise asymptotics in the Kerr exterior region. This provides a new proof of the generic $H^1_{\text{loc}}$-inextendibility of the Kerr Ca... |
1702.00472 | Aida Ahmadzadegan | Aida Ahmadzadegan, Achim Kempf | On the Unruh effect, trajectories and information | 12 pages, 3 figures | Class. Quantum Grav. 1361-6382 (2018) | 10.1088/1361-6382/aad13a | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the trajectories which maximize the Unruh effect, mode by mode,
when given a fixed energy budget for acceleration. We find that Unruh processes
are most likely to occur, and therefore potentially best observable, for
certain trajectories whose acceleration is not uniform. In practice, the
precise form of... | [
{
"created": "Wed, 1 Feb 2017 22:06:22 GMT",
"version": "v1"
},
{
"created": "Sat, 11 Feb 2017 00:27:03 GMT",
"version": "v2"
},
{
"created": "Sat, 17 Nov 2018 18:56:51 GMT",
"version": "v3"
}
] | 2018-11-20 | [
[
"Ahmadzadegan",
"Aida",
""
],
[
"Kempf",
"Achim",
""
]
] | We calculate the trajectories which maximize the Unruh effect, mode by mode, when given a fixed energy budget for acceleration. We find that Unruh processes are most likely to occur, and therefore potentially best observable, for certain trajectories whose acceleration is not uniform. In practice, the precise form of o... |
1209.3950 | Stefano Ansoldi | Stefano Ansoldi and Lorenzo Sindoni | Multihorizon regular black holes | To appear in the proceedings of the 13th Marcel Grossmann Meeting,
Stockholm 1-7 July 2012 (3 pages, 1 figure); references added | null | null | AEI-2012-083 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a general procedure to generate a class of (everywhere regular)
solutions of Einstein equations that can have an (a-priori fixed) arbitrary
number of horizons. We then report on work currently in progress i) to find a
suitable classification scheme for the maximal extension of these solutions and
ii) to in... | [
{
"created": "Tue, 18 Sep 2012 13:19:40 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Sep 2012 12:20:33 GMT",
"version": "v2"
}
] | 2012-09-24 | [
[
"Ansoldi",
"Stefano",
""
],
[
"Sindoni",
"Lorenzo",
""
]
] | We discuss a general procedure to generate a class of (everywhere regular) solutions of Einstein equations that can have an (a-priori fixed) arbitrary number of horizons. We then report on work currently in progress i) to find a suitable classification scheme for the maximal extension of these solutions and ii) to inte... |
2106.08925 | Kanchan Soni | Kanchan Soni, Bhooshan Uday Gadre, Sanjit Mitra, Sanjeev Dhurandhar | Hierarchical search for compact binary coalescences in the Advanced
LIGO's first two observing runs | 15 pages, 11 figures | null | 10.1103/PhysRevD.105.064005 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Detection of many compact binary coalescences (CBCs) is one of the primary
goals of the present and future ground-based gravitational-wave (GW) detectors.
While increasing the detectors' sensitivities will be crucial in achieving
this, efficient data analysis strategies can play a vital role. With given
computational... | [
{
"created": "Wed, 16 Jun 2021 16:30:46 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jun 2021 13:29:02 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Mar 2022 05:42:09 GMT",
"version": "v3"
}
] | 2022-03-08 | [
[
"Soni",
"Kanchan",
""
],
[
"Gadre",
"Bhooshan Uday",
""
],
[
"Mitra",
"Sanjit",
""
],
[
"Dhurandhar",
"Sanjeev",
""
]
] | Detection of many compact binary coalescences (CBCs) is one of the primary goals of the present and future ground-based gravitational-wave (GW) detectors. While increasing the detectors' sensitivities will be crucial in achieving this, efficient data analysis strategies can play a vital role. With given computational p... |
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