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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/9207006 | null | Ted Jacobson and Joseph D. Romano | The Spin Holonomy Group In General Relativity | 21 pages | Commun.Math.Phys. 155 (1993) 261-276 | 10.1007/BF02097393 | UMDGR-92-208 | gr-qc | null | It has recently been shown by Goldberg et al that the holonomy group of the
chiral spin-connection is preserved under time evolution in vacuum general
relativity. Here, the underlying reason for the time-independence of the
holonomy group is traced to the self-duality of the curvature 2-form for an
Einstein space. Th... | [
{
"created": "Thu, 23 Jul 1992 15:53:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Jacobson",
"Ted",
""
],
[
"Romano",
"Joseph D.",
""
]
] | It has recently been shown by Goldberg et al that the holonomy group of the chiral spin-connection is preserved under time evolution in vacuum general relativity. Here, the underlying reason for the time-independence of the holonomy group is traced to the self-duality of the curvature 2-form for an Einstein space. This... |
gr-qc/9908031 | Theodore A. Jacobson | Ted Jacobson | On the nature of black hole entropy | 13 pages, 2 figures; references added, almost same as version
published in General Relativity And Relativistic Astrophysics: Eighth
Canadian Conference, AIP Conference Proceedings 493, eds. C.P. Burgess and
R.C. Myers (AIP, 1999) | null | 10.1063/1.1301569 | NSF-ITP-99-094 | gr-qc hep-th | null | I argue that black hole entropy counts only those states of a black hole that
can influence the outside, and attempt (with only partial success) to defend
this claim against various objections, all but one coming from string theory.
Implications for the nature of the Bekenstein bound are discussed, and in
particular ... | [
{
"created": "Tue, 10 Aug 1999 21:16:37 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jan 2000 23:27:44 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Jacobson",
"Ted",
""
]
] | I argue that black hole entropy counts only those states of a black hole that can influence the outside, and attempt (with only partial success) to defend this claim against various objections, all but one coming from string theory. Implications for the nature of the Bekenstein bound are discussed, and in particular th... |
2202.04029 | Gabriel Le\'on | Gabriel Leon | Inflation and the cosmological (not-so) constant in unimodular gravity | 39 pages, 6 Figures. Some references added. Accepted for publication
in CQG | Class.Quant.Grav. 39 (2022) 7, 075008 | 10.1088/1361-6382/ac52bc | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a mechanism for generating an inflationary phase in the early
universe without resorting to any type of scalar field(s). Instead, this
accelerated expansion is driven by a dynamical "cosmological constant" in the
framework of unimodular gravity. The time dependent cosmological constant can
be related to an... | [
{
"created": "Tue, 8 Feb 2022 17:53:12 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Mar 2022 20:34:49 GMT",
"version": "v2"
}
] | 2022-03-18 | [
[
"Leon",
"Gabriel",
""
]
] | We propose a mechanism for generating an inflationary phase in the early universe without resorting to any type of scalar field(s). Instead, this accelerated expansion is driven by a dynamical "cosmological constant" in the framework of unimodular gravity. The time dependent cosmological constant can be related to an e... |
2310.15507 | Kun Hu | Kun Hu, Makishi Yamakoshi, Taishi Katsuragawa, Shin'ichi Nojiri,
Taotao Qiu | Nonpropagating ghost in covariant $f(Q)$ gravity | 31 pages, 0 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | $f(Q)$ gravity is an extension of the symmetric teleparallel equivalent to
general relativity (STEGR). This work shows that based on the
scalar-nonmetricity formulation, a scalar mode in $f(Q)$ gravity has a negative
kinetic energy. This conclusion holds regardless of the coincident gauge
frequently used in STEGR and... | [
{
"created": "Tue, 24 Oct 2023 04:24:53 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Dec 2023 13:44:39 GMT",
"version": "v2"
}
] | 2023-12-14 | [
[
"Hu",
"Kun",
""
],
[
"Yamakoshi",
"Makishi",
""
],
[
"Katsuragawa",
"Taishi",
""
],
[
"Nojiri",
"Shin'ichi",
""
],
[
"Qiu",
"Taotao",
""
]
] | $f(Q)$ gravity is an extension of the symmetric teleparallel equivalent to general relativity (STEGR). This work shows that based on the scalar-nonmetricity formulation, a scalar mode in $f(Q)$ gravity has a negative kinetic energy. This conclusion holds regardless of the coincident gauge frequently used in STEGR and $... |
gr-qc/0409026 | Christoph Schmid | Christoph Schmid (Institute for Theoretical Physics, ETH Zurich) | The Cosmological Origin of Inertia: Mach's Principle | 8 pages | null | null | null | gr-qc astro-ph | null | The axes of gyroscopes experimentally define local non-rotating frames, i.e.
the time-evolution of axes of inertial frames. But what physical cause governs
the time-evolution of gyroscope axes? Starting from an unperturbed FRW
cosmology with k=0 we consider linear cosmological vorticity perturbations and
ask: Will co... | [
{
"created": "Mon, 6 Sep 2004 21:14:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schmid",
"Christoph",
"",
"Institute for Theoretical Physics, ETH Zurich"
]
] | The axes of gyroscopes experimentally define local non-rotating frames, i.e. the time-evolution of axes of inertial frames. But what physical cause governs the time-evolution of gyroscope axes? Starting from an unperturbed FRW cosmology with k=0 we consider linear cosmological vorticity perturbations and ask: Will cosm... |
gr-qc/0603010 | Martin Rocek | Martin Rocek and Patrick van Nieuwenhuizen | Does Smoothing Matter? | 8 pages [References updated, minor corrections] | null | null | YITP-SB-06-01,ITFA-2006-09 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study how inhomogeneities modify large scale parameters in General
Relativity. For a particular model, we obtain exact results: we compare an
infinite string of extremal black holes to a corresponding smooth line with the
same mass and charge in five dimensions. We find that the effective energy
density does not d... | [
{
"created": "Mon, 6 Mar 2006 07:56:02 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Mar 2011 21:31:13 GMT",
"version": "v2"
}
] | 2011-03-31 | [
[
"Rocek",
"Martin",
""
],
[
"van Nieuwenhuizen",
"Patrick",
""
]
] | We study how inhomogeneities modify large scale parameters in General Relativity. For a particular model, we obtain exact results: we compare an infinite string of extremal black holes to a corresponding smooth line with the same mass and charge in five dimensions. We find that the effective energy density does not dif... |
gr-qc/9704082 | Matt Visser | David Hochberg (LAEFF, Madrid) and Matt Visser (Washington University) | Geometric structure of the generic static traversable wormhole throat | 25 pages; plain LaTeX; uses epsf.sty (four encapsulated postscript
figures) | Phys.Rev.D56:4745-4755,1997 | 10.1103/PhysRevD.56.4745 | null | gr-qc hep-th | null | Traversable wormholes have traditionally been viewed as intrinsically
topological entities in some multiply connected spacetime. Here, we show that
topology is too limited a tool to accurately characterize a generic traversable
wormhole: in general one needs geometric information to detect the presence of
a wormhole,... | [
{
"created": "Tue, 29 Apr 1997 22:30:15 GMT",
"version": "v1"
}
] | 2011-09-30 | [
[
"Hochberg",
"David",
"",
"LAEFF, Madrid"
],
[
"Visser",
"Matt",
"",
"Washington University"
]
] | Traversable wormholes have traditionally been viewed as intrinsically topological entities in some multiply connected spacetime. Here, we show that topology is too limited a tool to accurately characterize a generic traversable wormhole: in general one needs geometric information to detect the presence of a wormhole, o... |
1612.08251 | Naoki Tsukamoto | Naoki Tsukamoto | Deflection angle in the strong deflection limit in a general
asymptotically flat, static, spherically symmetric spacetime | 20 pages, 1 figure, minor correction, accepted for publication in
Physical Review D | Phys. Rev. D 95, 064035 (2017) | 10.1103/PhysRevD.95.064035 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational lensing by the light sphere of compact objects like black holes
and wormholes will give us information on the compact objects. In this paper,
we provide an improved strong deflection limit analysis in a general
asymptotically flat, static, spherically symmetric spacetime. The strong
deflection limit ana... | [
{
"created": "Sun, 25 Dec 2016 08:47:04 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Mar 2017 12:51:26 GMT",
"version": "v2"
}
] | 2017-03-24 | [
[
"Tsukamoto",
"Naoki",
""
]
] | Gravitational lensing by the light sphere of compact objects like black holes and wormholes will give us information on the compact objects. In this paper, we provide an improved strong deflection limit analysis in a general asymptotically flat, static, spherically symmetric spacetime. The strong deflection limit analy... |
1201.2947 | Sanved Kolekar | Sanved Kolekar, T. Padmanabhan and Sudipta Sarkar | Entropy increase during physical processes for black holes in
Lanczos-Lovelock gravity | 5 pages, no figure | Phys. Rev. D 86, 021501(R) (2012) | 10.1103/PhysRevD.86.021501 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study quasi-stationary physical process for black holes within the context
of Lanczos-Lovelock gravity. We show that the Wald entropy of stationary black
holes in Lanczos-Lovelock gravity monotonically increases for quasi-stationary
physical processes in which the horizon is perturbed by the accretion of
positive ... | [
{
"created": "Fri, 13 Jan 2012 21:00:15 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jan 2012 14:38:53 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Jun 2012 14:22:49 GMT",
"version": "v3"
},
{
"created": "Tue, 26 Feb 2013 16:57:28 GMT",
"version": "v4"
}
] | 2013-02-27 | [
[
"Kolekar",
"Sanved",
""
],
[
"Padmanabhan",
"T.",
""
],
[
"Sarkar",
"Sudipta",
""
]
] | We study quasi-stationary physical process for black holes within the context of Lanczos-Lovelock gravity. We show that the Wald entropy of stationary black holes in Lanczos-Lovelock gravity monotonically increases for quasi-stationary physical processes in which the horizon is perturbed by the accretion of positive en... |
1004.3913 | Mario Novello | M. Novello and E. Bittencourt | Gaussian coordinate systems for the Kerr metric | null | null | 10.1134/S0202289311030054 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the whole class of Gaussian coordinate systems for the Kerr
metric. This is achieved through the uses of the relationship between Gaussian
observers and the relativistic Hamilton-Jacobi equation. We analyze the
completeness of this coordinate system. In the appendix we present the
equivalent JEK formulatio... | [
{
"created": "Thu, 22 Apr 2010 13:19:44 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Novello",
"M.",
""
],
[
"Bittencourt",
"E.",
""
]
] | We present the whole class of Gaussian coordinate systems for the Kerr metric. This is achieved through the uses of the relationship between Gaussian observers and the relativistic Hamilton-Jacobi equation. We analyze the completeness of this coordinate system. In the appendix we present the equivalent JEK formulation ... |
gr-qc/9603032 | Saha Bijan | Yu. P. Rybakov, B. Saha and G. N. Shikin | Droplets in General Relativity: Exact Self-Consistent Solutions to the
Interacting Scalar and Electromagnetic Field Equations | LaTeX, 12 pages | Grav.Cosmol. 4 (1998) 114-120 | null | IC/IR/96/10 | gr-qc | null | It is shown, for the self-consistent system of scalar, electro-magnetic and
gravitational fields in general relativity, that the equations of motion admit
a special kind of solutions with spherical or cylindrical symmetry. For these
solutions, the physical fields vanish and the space-time is flat outside of the
criti... | [
{
"created": "Thu, 21 Mar 1996 08:40:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rybakov",
"Yu. P.",
""
],
[
"Saha",
"B.",
""
],
[
"Shikin",
"G. N.",
""
]
] | It is shown, for the self-consistent system of scalar, electro-magnetic and gravitational fields in general relativity, that the equations of motion admit a special kind of solutions with spherical or cylindrical symmetry. For these solutions, the physical fields vanish and the space-time is flat outside of the critica... |
1804.00905 | Ian G. Moss | Ian G. Moss | Analogue Gravity and Trans-Atlantic Air Travel | 6 pages, 6 figures, LaTeX | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of finding a minimal-time path for an aeroplane travelling in a
wind flow has a simple formulation in terms of analogue gravity. This paper
gives an elementary explanation with equations and some numerical solutions.
| [
{
"created": "Tue, 3 Apr 2018 10:43:57 GMT",
"version": "v1"
}
] | 2018-04-04 | [
[
"Moss",
"Ian G.",
""
]
] | The problem of finding a minimal-time path for an aeroplane travelling in a wind flow has a simple formulation in terms of analogue gravity. This paper gives an elementary explanation with equations and some numerical solutions. |
1605.04767 | Jorge A. Rueda | J. F. Rodriguez, J. A. Rueda, R. Ruffini | What can we really infer from GW 150914? | Submitted to MNRAS Lett | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the event GW 150914 announced by the Advanced Laser Interferometer
Gravitational-Wave Observatory (LIGO) as the gravitational-wave emission of a
black-hole binary merger. We show that the parameters of the coalescing system
and of the newly formed Kerr black-hole can be extracted from basic results of
the ... | [
{
"created": "Mon, 16 May 2016 13:30:39 GMT",
"version": "v1"
},
{
"created": "Tue, 24 May 2016 11:17:42 GMT",
"version": "v2"
}
] | 2016-05-25 | [
[
"Rodriguez",
"J. F.",
""
],
[
"Rueda",
"J. A.",
""
],
[
"Ruffini",
"R.",
""
]
] | We analyze the event GW 150914 announced by the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) as the gravitational-wave emission of a black-hole binary merger. We show that the parameters of the coalescing system and of the newly formed Kerr black-hole can be extracted from basic results of the gr... |
0808.2956 | Roman Sverdlov | Roman Sverdlov | Spinor fields in Causal Set Theory | 19 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The goal of this paper is to define fermionic fields on causal set. This is
done by the use of holonomies to define vierbines, and then defining spinor
fields by taking advantage of the leftover degrees of freedom of holonomies
plus additional scalar fields. Grassmann nature is being enforced by allowing
measure to t... | [
{
"created": "Thu, 21 Aug 2008 17:12:13 GMT",
"version": "v1"
}
] | 2008-08-22 | [
[
"Sverdlov",
"Roman",
""
]
] | The goal of this paper is to define fermionic fields on causal set. This is done by the use of holonomies to define vierbines, and then defining spinor fields by taking advantage of the leftover degrees of freedom of holonomies plus additional scalar fields. Grassmann nature is being enforced by allowing measure to tak... |
2205.13696 | Songbai Chen | Zelin Zhang, Songbai Chen, Jiliang Jing | Image of Bonnor black dihole with a thin accretion disk and its
polarization information | 18 pages, 11 figures, matched with the EPJC published version | Eur. Phys. J. C 82: 835 (2022) | 10.1140/epjc/s10052-022-10794-z | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the image of Bonnor black dihole surrounded by a thin
accretion disk where the electromagnetic emission is assumed to be dominated
respectively by black body radiation and synchrotron radiation. Our results
show that the intensity of Bonnor black dihole image increases with the
magnetic parameter and ... | [
{
"created": "Fri, 27 May 2022 01:16:44 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Sep 2022 01:27:44 GMT",
"version": "v2"
}
] | 2022-09-27 | [
[
"Zhang",
"Zelin",
""
],
[
"Chen",
"Songbai",
""
],
[
"Jing",
"Jiliang",
""
]
] | We have studied the image of Bonnor black dihole surrounded by a thin accretion disk where the electromagnetic emission is assumed to be dominated respectively by black body radiation and synchrotron radiation. Our results show that the intensity of Bonnor black dihole image increases with the magnetic parameter and th... |
2105.08430 | Matej Pavsic | Matej Pav\v{s}i\v{c} | On the Coupling of Relativistic Particle to Gravity and Wheeler-DeWitt
Quantization | 14 pages | null | 10.1142/S0217732321501728 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A system consisting of a point particle coupled to gravity is investigated.
The set of constraints is derived. It was found that a suitable superposition
of those constraints is the generator of the infinitesimal transformations of
the time coordinate $t\equiv x^0$ and serves as the Hamiltonian which gives the
correc... | [
{
"created": "Tue, 18 May 2021 10:37:35 GMT",
"version": "v1"
}
] | 2021-08-25 | [
[
"Pavšič",
"Matej",
""
]
] | A system consisting of a point particle coupled to gravity is investigated. The set of constraints is derived. It was found that a suitable superposition of those constraints is the generator of the infinitesimal transformations of the time coordinate $t\equiv x^0$ and serves as the Hamiltonian which gives the correct ... |
2105.05034 | Merab Gogberashvili Prof | Merab Gogberashvili and Beka Modrekiladze | Probing the Information-Probabilistic Description | The version published by Int. J. Theor. Phys | Int. J. Theor. Phys. 61 (2022) 149 | 10.1007/s10773-022-05129-3 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The information conservation principle is probed for classically isolated
systems, like the Hubble sphere and black holes, for which the rise of
entanglement entropy across their horizons is expected. We accept the analogy
of Landauer's principle that entanglement information should introduce some
negative potential ... | [
{
"created": "Mon, 10 May 2021 04:43:24 GMT",
"version": "v1"
},
{
"created": "Thu, 26 May 2022 16:09:54 GMT",
"version": "v2"
}
] | 2022-05-27 | [
[
"Gogberashvili",
"Merab",
""
],
[
"Modrekiladze",
"Beka",
""
]
] | The information conservation principle is probed for classically isolated systems, like the Hubble sphere and black holes, for which the rise of entanglement entropy across their horizons is expected. We accept the analogy of Landauer's principle that entanglement information should introduce some negative potential en... |
1909.00096 | Sumanta Chakraborty | Sumanta Chakraborty and T. Padmanabhan | Boundary Term in the Gravitational Action is the Heat Content of the
Null surfaces | Published Version, 14 pages, no figures | Phys. Rev. D 101, 064023 (2020) | 10.1103/PhysRevD.101.064023 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein-Hilbert Lagrangian has no well-defined variational derivative
with respect to the metric. This issue has to be tackled by adding a suitable
surface term to the action, which is a peculiar feature of gravity. We also
know that null surfaces in spacetime exhibit (observer-dependent) thermodynamic
features.... | [
{
"created": "Sat, 31 Aug 2019 00:20:55 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Sep 2019 13:49:08 GMT",
"version": "v2"
},
{
"created": "Tue, 17 Mar 2020 00:39:38 GMT",
"version": "v3"
}
] | 2020-03-18 | [
[
"Chakraborty",
"Sumanta",
""
],
[
"Padmanabhan",
"T.",
""
]
] | The Einstein-Hilbert Lagrangian has no well-defined variational derivative with respect to the metric. This issue has to be tackled by adding a suitable surface term to the action, which is a peculiar feature of gravity. We also know that null surfaces in spacetime exhibit (observer-dependent) thermodynamic features. T... |
2012.11597 | Nidal Haddad | Fateen Haddad and Nidal Haddad | Solar System, Astrophysics, and Cosmology from the Derivative Expansion | 25 pages, 6 figures, text and references added | Gen Relativ Gravit 53, 80 (2021) | 10.1007/s10714-021-02849-5 | null | gr-qc astro-ph.CO astro-ph.GA hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper we show how the solar system, the galactic, and the
cosmological scales, are accommodated in a single framework, namely, in the
derivative expansion framework. We construct a locally inertial static metric,
based on the Einstein equations and on the derivative expansion method, which
describes a Schwarz... | [
{
"created": "Sun, 20 Dec 2020 19:34:47 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Feb 2021 11:50:52 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Feb 2021 08:25:51 GMT",
"version": "v3"
},
{
"created": "Sun, 22 Aug 2021 12:12:13 GMT",
"version": "v4"
}
] | 2021-08-24 | [
[
"Haddad",
"Fateen",
""
],
[
"Haddad",
"Nidal",
""
]
] | In this paper we show how the solar system, the galactic, and the cosmological scales, are accommodated in a single framework, namely, in the derivative expansion framework. We construct a locally inertial static metric, based on the Einstein equations and on the derivative expansion method, which describes a Schwarzsc... |
0809.4763 | Kirill Krasnov | Sergei Alexandrov and Kirill Krasnov | Hamiltonian Analysis of non-chiral Plebanski Theory and its
Generalizations | 10 pages | Class.Quant.Grav.26:055005,2009 | 10.1088/0264-9381/26/5/055005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider non-chiral, full Lorentz group-based Plebanski formulation of
general relativity in its version that utilizes the Lagrange multiplier field
Phi with "internal" indices. The Hamiltonian analysis of this version of the
theory turns out to be simpler than in the previously considered in the
literature versio... | [
{
"created": "Sat, 27 Sep 2008 11:08:44 GMT",
"version": "v1"
}
] | 2009-02-16 | [
[
"Alexandrov",
"Sergei",
""
],
[
"Krasnov",
"Kirill",
""
]
] | We consider non-chiral, full Lorentz group-based Plebanski formulation of general relativity in its version that utilizes the Lagrange multiplier field Phi with "internal" indices. The Hamiltonian analysis of this version of the theory turns out to be simpler than in the previously considered in the literature version ... |
gr-qc/0511129 | Bahram Mashhoon | C. Chicone and B. Mashhoon | Explicit Fermi Coordinates and Tidal Dynamics in de Sitter and Goedel
Spacetimes | 23 pages, 3 figures; v2: expanded version (27 pages, 3 figures) | Phys.Rev. D74 (2006) 064019 | 10.1103/PhysRevD.74.064019 | null | gr-qc astro-ph | null | Fermi coordinates are directly constructed in de Sitter and Goedel spacetimes
and the corresponding exact coordinate transformations are given explicitly.
The quasi-inertial Fermi coordinates are then employed to discuss the dynamics
of a free test particle in these spacetimes and the results are compared to the
corr... | [
{
"created": "Thu, 24 Nov 2005 01:29:52 GMT",
"version": "v1"
},
{
"created": "Tue, 16 May 2006 23:09:07 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Chicone",
"C.",
""
],
[
"Mashhoon",
"B.",
""
]
] | Fermi coordinates are directly constructed in de Sitter and Goedel spacetimes and the corresponding exact coordinate transformations are given explicitly. The quasi-inertial Fermi coordinates are then employed to discuss the dynamics of a free test particle in these spacetimes and the results are compared to the corres... |
1909.05451 | Yaohua Wang | Yaohua Wang, Xiao Zhang | Positive energy theorem for asymptotically anti-de Sitter spacetimes
with distributional curvature | 16 pages | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We establish the positive energy theorem for weak asymptotically anti-de
Sitter initial data sets with distributional curvature under the weak dominant
energy condition.
| [
{
"created": "Thu, 12 Sep 2019 04:47:46 GMT",
"version": "v1"
}
] | 2019-09-13 | [
[
"Wang",
"Yaohua",
""
],
[
"Zhang",
"Xiao",
""
]
] | We establish the positive energy theorem for weak asymptotically anti-de Sitter initial data sets with distributional curvature under the weak dominant energy condition. |
0710.1338 | Frans Pretorius | Frans Pretorius | Binary Black Hole Coalescence | 42 pages, 7 Figures. The "final version" of this Lecture Note will
appear in the book: "Relativistic Objects in Compact Binaries: From Birth to
Coalescence" Editor: Colpi et al. Pulisher: Springer Verlag, Canopus
Publishing Limited | null | null | null | gr-qc astro-ph hep-th | null | The two-body problem in general relativity is reviewed, focusing on the final
stages of the coalescence of the black holes as uncovered by recent successes
in numerical solution of the field equations.
| [
{
"created": "Sat, 6 Oct 2007 02:52:33 GMT",
"version": "v1"
}
] | 2007-10-11 | [
[
"Pretorius",
"Frans",
""
]
] | The two-body problem in general relativity is reviewed, focusing on the final stages of the coalescence of the black holes as uncovered by recent successes in numerical solution of the field equations. |
2306.14271 | Peng-Ming Zhang | M. Elbistan, P.-M. Zhang, P. A. Horvathy | Memory Effect and Carroll Symmetry: 50 years after | Considerably extended version. 54 pages, with many figures, to be
published by Annals of Physics | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Particles at rest before the arrival of a burst of gravitational wave move,
after the wave has passed, with constant velocity along diverging geodesics. As
recognized by Souriau 50 years ago and then forgotten, their motion is
particularly simple in Baldwin-Jeffery-Rosen (BJR) coordinates (which are
however defined o... | [
{
"created": "Sun, 25 Jun 2023 15:37:08 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Aug 2023 00:02:17 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Nov 2023 15:26:35 GMT",
"version": "v3"
}
] | 2023-11-03 | [
[
"Elbistan",
"M.",
""
],
[
"Zhang",
"P. -M.",
""
],
[
"Horvathy",
"P. A.",
""
]
] | Particles at rest before the arrival of a burst of gravitational wave move, after the wave has passed, with constant velocity along diverging geodesics. As recognized by Souriau 50 years ago and then forgotten, their motion is particularly simple in Baldwin-Jeffery-Rosen (BJR) coordinates (which are however defined onl... |
2007.16053 | Dr. Goutam Manna | Bivash Majumder, Saibal Ray and Goutam Manna | Evaporation of dynamical horizon with the Hawking temparature in the
{\bf K-}essence emergent Vaidya spacetime | 11 pages, 6 figures, Accepted from Fortschritte der Physik (2023) | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In the {\bf K-}essence Vaidya Schwarzschild spacetime, we apply the dynamical
horizon equation to measure the mass-loss due to Hawking radiation and the
tunneling formalism (Hamilton-Jacobi method) to calculate the hawking
temperature. Assuming the Dirac-Born-Infeld kind of non-standard action for the
{\bf K-}essence... | [
{
"created": "Thu, 30 Jul 2020 17:11:39 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Aug 2021 02:16:48 GMT",
"version": "v2"
},
{
"created": "Fri, 4 Aug 2023 02:36:38 GMT",
"version": "v3"
}
] | 2023-08-07 | [
[
"Majumder",
"Bivash",
""
],
[
"Ray",
"Saibal",
""
],
[
"Manna",
"Goutam",
""
]
] | In the {\bf K-}essence Vaidya Schwarzschild spacetime, we apply the dynamical horizon equation to measure the mass-loss due to Hawking radiation and the tunneling formalism (Hamilton-Jacobi method) to calculate the hawking temperature. Assuming the Dirac-Born-Infeld kind of non-standard action for the {\bf K-}essence h... |
2202.12686 | Piyali Bhar | Piyali Bhar | Dark Energy Stars in Tolman-Kuchowicz spacetime in the context of
Einstein Gravity | 15 Pages, 10 Figures | Physics of the Dark Universe 34, 100879 (2021) | 10.1016/j.dark.2021.100879 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dark energy is the component in the present Universe with the greatest
abundance, and it is responsible for the accelerating expansion of the
Universe. As a result, dark energy is likely to interact with any compact
astrophysical object [Muhammad F.A.R. Sakti and Anto Sulaksono, {\it Phys. Rev.
D} {\bf 103}, 084042 (... | [
{
"created": "Thu, 24 Feb 2022 16:49:06 GMT",
"version": "v1"
}
] | 2022-02-28 | [
[
"Bhar",
"Piyali",
""
]
] | Dark energy is the component in the present Universe with the greatest abundance, and it is responsible for the accelerating expansion of the Universe. As a result, dark energy is likely to interact with any compact astrophysical object [Muhammad F.A.R. Sakti and Anto Sulaksono, {\it Phys. Rev. D} {\bf 103}, 084042 (20... |
1406.3706 | Aurelien Barrau | Aurelien Barrau, Linda Linsefors | Our Universe from the cosmological constant | 5 pages, accepted by JCAP | JCAP 12 (2014) 037 | 10.1088/1475-7516/2014/12/037 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we consider a bouncing Universe, as described for example by
Loop Quantum Cosmology. If the current acceleration is due to a true
cosmological constant, this constant is naturally conserved through the bounce
and the Universe should also be in a (contracting) de Sitter phase in the
remote past. We in... | [
{
"created": "Sat, 14 Jun 2014 09:14:14 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Oct 2014 14:39:13 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Dec 2014 11:17:59 GMT",
"version": "v3"
}
] | 2015-06-22 | [
[
"Barrau",
"Aurelien",
""
],
[
"Linsefors",
"Linda",
""
]
] | In this article, we consider a bouncing Universe, as described for example by Loop Quantum Cosmology. If the current acceleration is due to a true cosmological constant, this constant is naturally conserved through the bounce and the Universe should also be in a (contracting) de Sitter phase in the remote past. We inve... |
2009.11388 | Jorge Noronha | Fabio S. Bemfica, Marcelo M. Disconzi, and Jorge Noronha | First-Order General-Relativistic Viscous Fluid Dynamics | Revised version, 46 pages, 4 new appendices, new references added,
version accepted for publication in Physical Review X | null | null | null | gr-qc hep-ph hep-th nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first generalization of Navier-Stokes theory to relativity
that satisfies all of the following properties: (a) the system coupled to
Einstein's equations is causal and strongly hyperbolic; (b) equilibrium states
are stable; (c) all leading dissipative contributions are present, i.e., shear
viscosity, b... | [
{
"created": "Wed, 23 Sep 2020 21:35:25 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Mar 2022 14:25:39 GMT",
"version": "v2"
}
] | 2022-03-02 | [
[
"Bemfica",
"Fabio S.",
""
],
[
"Disconzi",
"Marcelo M.",
""
],
[
"Noronha",
"Jorge",
""
]
] | We present the first generalization of Navier-Stokes theory to relativity that satisfies all of the following properties: (a) the system coupled to Einstein's equations is causal and strongly hyperbolic; (b) equilibrium states are stable; (c) all leading dissipative contributions are present, i.e., shear viscosity, bul... |
2401.06329 | Koichiro Uehara | Koichiro Uehara, Albert Escriv\`a, Tomohiro Harada, Daiki Saito and
Chul-Moon Yoo | Numerical simulation of type II primordial black hole formation | null | null | null | RUP-24-1 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study investigates the formation of primordial black holes (PBHs)
resulting from extremely large amplitudes of initial fluctuations in a
radiation-dominated universe. We find that, for a sufficiently large initial
amplitude, the configuration of trapping horizons shows characteristic
structure due to the existen... | [
{
"created": "Fri, 12 Jan 2024 02:41:10 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Feb 2024 01:10:43 GMT",
"version": "v2"
},
{
"created": "Wed, 8 May 2024 01:53:20 GMT",
"version": "v3"
}
] | 2024-05-09 | [
[
"Uehara",
"Koichiro",
""
],
[
"Escrivà",
"Albert",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Saito",
"Daiki",
""
],
[
"Yoo",
"Chul-Moon",
""
]
] | This study investigates the formation of primordial black holes (PBHs) resulting from extremely large amplitudes of initial fluctuations in a radiation-dominated universe. We find that, for a sufficiently large initial amplitude, the configuration of trapping horizons shows characteristic structure due to the existence... |
1907.04647 | Mohammad Reza Setare | M. Dehghani and M.R. Setare | de Sitter field equations from quadratic curvature gravity: A group
theoretical approach | 17 pages. arXiv admin note: text overlap with arXiv:1601.03946 | null | 10.1142/S0217751X20500980 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the linearized field equations related to the quadratic
curvature gravity theory have been obtained in the four-dimensional de Sitter
(dS) space-time. The massless spin-2 field equations have been written in terms
of the Casimir operators of dS group making use of the ambient space notations.
By imposi... | [
{
"created": "Sun, 7 Jul 2019 05:41:48 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Jul 2019 07:40:36 GMT",
"version": "v2"
}
] | 2020-07-15 | [
[
"Dehghani",
"M.",
""
],
[
"Setare",
"M. R.",
""
]
] | In this paper, the linearized field equations related to the quadratic curvature gravity theory have been obtained in the four-dimensional de Sitter (dS) space-time. The massless spin-2 field equations have been written in terms of the Casimir operators of dS group making use of the ambient space notations. By imposing... |
1110.4024 | Emmanuil Saridakis | P.A. Gonzalez (Chile U., Santiago & Diego Portales U.), Emmanuel N.
Saridakis (Baylor U.), Yerko Vasquez (La Frontera U., Temuco) | Circularly symmetric solutions in three-dimensional Teleparallel, f(T)
and Maxwell-f(T) gravity | 33 pages, 6 figures, significant improvement, version published at
JHEP | null | 10.1007/JHEP07(2012)053 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present teleparallel 3D gravity and we extract circularly symmetric
solutions, showing that they coincide with the BTZ and Deser-de-Sitter
solutions of standard 3D gravity. However, extending into f(T) 3D gravity, that
is considering arbitrary functions of the torsion scalar in the action, we
obtain BTZ-like and D... | [
{
"created": "Tue, 18 Oct 2011 15:34:21 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jul 2012 20:55:09 GMT",
"version": "v2"
}
] | 2015-05-30 | [
[
"Gonzalez",
"P. A.",
"",
"Chile U., Santiago & Diego Portales U."
],
[
"Saridakis",
"Emmanuel N.",
"",
"Baylor U."
],
[
"Vasquez",
"Yerko",
"",
"La Frontera U., Temuco"
]
] | We present teleparallel 3D gravity and we extract circularly symmetric solutions, showing that they coincide with the BTZ and Deser-de-Sitter solutions of standard 3D gravity. However, extending into f(T) 3D gravity, that is considering arbitrary functions of the torsion scalar in the action, we obtain BTZ-like and Des... |
2101.03691 | Matthew Robbins | Matthew P. G. Robbins, Niayesh Afshordi, Alan O. Jamison, Robert B.
Mann | Detection of Gravitational Waves using Parametric Resonance in
Bose-Einstein Condensates | 20 pages, 9 figures; updated figures; clarified some discussions | null | 10.1088/1361-6382/ac7b05 | null | gr-qc astro-ph.IM cond-mat.quant-gas quant-ph | http://creativecommons.org/licenses/by/4.0/ | An interesting proposal for detecting gravitational waves involves quantum
metrology of Bose-Einstein condensates (BECs). We consider a forced modulation
of the BEC trap, whose frequency matches that of an incoming continuous
gravitational wave. The trap modulation induces parametric resonance in the
BEC, which in tu... | [
{
"created": "Mon, 11 Jan 2021 03:59:24 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Mar 2021 17:03:10 GMT",
"version": "v2"
}
] | 2022-08-24 | [
[
"Robbins",
"Matthew P. G.",
""
],
[
"Afshordi",
"Niayesh",
""
],
[
"Jamison",
"Alan O.",
""
],
[
"Mann",
"Robert B.",
""
]
] | An interesting proposal for detecting gravitational waves involves quantum metrology of Bose-Einstein condensates (BECs). We consider a forced modulation of the BEC trap, whose frequency matches that of an incoming continuous gravitational wave. The trap modulation induces parametric resonance in the BEC, which in turn... |
0801.0122 | Salvatore Capozziello | S. Capozziello, M. De Laurentis, F.De Paolis, G. Ingrosso, A. Nucita | Gravitational waves from hyperbolic encounters | 6 pages, 2 figures | Mod.Phys.Lett.A23:99-107,2008 | 10.1142/S0217732308026236 | null | gr-qc | null | The emission of gravitational waves from a system of massive objects
interacting on hyperbolic orbits is studied in the quadrupole approximation.
Analytic expressions are derived for the gravitational radiation luminosity,
the total energy output and the gravitational radiation amplitude. An
estimation of the expecte... | [
{
"created": "Sun, 30 Dec 2007 11:04:34 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jan 2008 14:47:48 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Jan 2008 11:33:15 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Capozziello",
"S.",
""
],
[
"De Laurentis",
"M.",
""
],
[
"De Paolis",
"F.",
""
],
[
"Ingrosso",
"G.",
""
],
[
"Nucita",
"A.",
""
]
] | The emission of gravitational waves from a system of massive objects interacting on hyperbolic orbits is studied in the quadrupole approximation. Analytic expressions are derived for the gravitational radiation luminosity, the total energy output and the gravitational radiation amplitude. An estimation of the expected ... |
2312.01478 | Alessandro Nagar | Anna Ceresole, Thibault Damour, Alessandro Nagar, and Piero Rettegno | Double copy, Kerr-Schild gauges and the Effective-One-Body formalism | 8 pages, 1 figure, small amendments and rewriting. Submitted to Phys.
Rev. D | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We look for a classical double copy structure between gravity and
electrodynamics by connecting the descriptions of the scattering of two point
masses, and of two point charges, in terms of perturbative (post-Minkowskian or
post-Lorentzian) expansions. We do so by recasting available analytical
information within the... | [
{
"created": "Sun, 3 Dec 2023 18:30:08 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Dec 2023 13:18:33 GMT",
"version": "v2"
}
] | 2023-12-12 | [
[
"Ceresole",
"Anna",
""
],
[
"Damour",
"Thibault",
""
],
[
"Nagar",
"Alessandro",
""
],
[
"Rettegno",
"Piero",
""
]
] | We look for a classical double copy structure between gravity and electrodynamics by connecting the descriptions of the scattering of two point masses, and of two point charges, in terms of perturbative (post-Minkowskian or post-Lorentzian) expansions. We do so by recasting available analytical information within the e... |
gr-qc/0002044 | Kayll Lake | Kayll Lake | Gravitational Collapse of Dust with a Cosmological Constant | 2 pages, 2 figures (png), revtex. To appear in Phys. Rev. D | Phys.Rev. D62 (2000) 027301 | 10.1103/PhysRevD.62.027301 | null | gr-qc astro-ph | null | The recent analysis of Markovic and Shapiro on the effect of a cosmological
constant on the evolution of a spherically symmetric homogeneous dust ball is
extended to include the inhomogeneous and degenerate cases. The histories are
shown by way of effective potential and Penrose-Carter diagrams.
| [
{
"created": "Sun, 13 Feb 2000 17:56:57 GMT",
"version": "v1"
},
{
"created": "Mon, 1 May 2000 17:02:07 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Lake",
"Kayll",
""
]
] | The recent analysis of Markovic and Shapiro on the effect of a cosmological constant on the evolution of a spherically symmetric homogeneous dust ball is extended to include the inhomogeneous and degenerate cases. The histories are shown by way of effective potential and Penrose-Carter diagrams. |
1703.05373 | Yi-Fan Wang | Yi-Fan Wang | Hawking Radiation: A Comparison of Pure-state and Thermal Descriptions | 37 pages, 5 figures, Master thesis at Rheinischen
Friedrich-Wilhelms-Universit\"at Bonn and Universit\"at zu K\"oln, submission
version, XeLaTeX | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The cases of the Hawking radiation field being described by a pure state and
by the usual thermal state are compared within the CGHS dilaton gravity model.
The field-strength fluctuations of the Fourier modes are computed, showing a
discrepancy in the low-energy regime, while coinciding at high energies. Then
by defi... | [
{
"created": "Wed, 15 Mar 2017 20:19:06 GMT",
"version": "v1"
}
] | 2017-03-17 | [
[
"Wang",
"Yi-Fan",
""
]
] | The cases of the Hawking radiation field being described by a pure state and by the usual thermal state are compared within the CGHS dilaton gravity model. The field-strength fluctuations of the Fourier modes are computed, showing a discrepancy in the low-energy regime, while coinciding at high energies. Then by defini... |
2203.01278 | Julio Cesar Fabris | J\'ulio C. Fabris, Tales A. O. Gomes and Denis C. Rodrigues | Black hole and wormhole solutions in Einstein-Maxwell-Scalar theory | Latex file, 23 pages, 9 figures, published in the Special Issue of
the journal Universe, "Recent Advances in Wormhole Physics", edited by K.
Bronnikov and S. Sushkov | null | null | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | We classified and studied the charged black hole and wormhole solutions in
the Einstein--Maxwell system in the presence of a massless, real scalar field.
The possible existence of charged black holes in general scalar--tensor
theories was studied in {Bronnikov et al, 1999;} black holes and wormholes
exist for a negat... | [
{
"created": "Wed, 2 Mar 2022 18:04:01 GMT",
"version": "v1"
}
] | 2022-03-03 | [
[
"Fabris",
"Júlio C.",
""
],
[
"Gomes",
"Tales A. O.",
""
],
[
"Rodrigues",
"Denis C.",
""
]
] | We classified and studied the charged black hole and wormhole solutions in the Einstein--Maxwell system in the presence of a massless, real scalar field. The possible existence of charged black holes in general scalar--tensor theories was studied in {Bronnikov et al, 1999;} black holes and wormholes exist for a negativ... |
gr-qc/0510092 | Joseph Katz | Joseph Katz | Gravitational energy | 12 pages. Accepted for publication in Class. Quantum Grav | Class.Quant.Grav.22:5169-5180,2005 | 10.1088/0264-9381/22/23/016 | null | gr-qc | null | Observers at rest in a stationary spacetime flat at infinity can measure
small amounts of rest-mass+internal energies+kinetic energies+pressure energy
in a small volume of fluid attached to a local inertial frame. The sum of these
small amounts is the total "matter energy" for those observers. The total
mass-energy m... | [
{
"created": "Thu, 20 Oct 2005 07:13:51 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Katz",
"Joseph",
""
]
] | Observers at rest in a stationary spacetime flat at infinity can measure small amounts of rest-mass+internal energies+kinetic energies+pressure energy in a small volume of fluid attached to a local inertial frame. The sum of these small amounts is the total "matter energy" for those observers. The total mass-energy min... |
1412.5621 | Alberto Garcia-Diaz | A.A. Garcia-Diaz and G. Gutierrez Cano | Dilaton minimally coupled to 2 + 1 Einstein Maxwell fields; stationary
cyclic symmetric black holes | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Schwarzschild coordinate frame for a static cyclic symmetric metric
in 2 + 1 Einstein gravity coupled to a electric Maxwell field and a dilaton
logarithmically depending on the radial coordinate in the presence of an
exponential potential the general solution of the Einstein Maxwell dilaton
equations is der... | [
{
"created": "Wed, 17 Dec 2014 21:18:21 GMT",
"version": "v1"
}
] | 2014-12-19 | [
[
"Garcia-Diaz",
"A. A.",
""
],
[
"Cano",
"G. Gutierrez",
""
]
] | Using the Schwarzschild coordinate frame for a static cyclic symmetric metric in 2 + 1 Einstein gravity coupled to a electric Maxwell field and a dilaton logarithmically depending on the radial coordinate in the presence of an exponential potential the general solution of the Einstein Maxwell dilaton equations is deriv... |
1309.2613 | Hari Kunduri | Aghil Alaee, Hari K. Kunduri, Eduardo Mart\'inez-Pedroza | Notes on maximal slices of five-dimensional black holes | LateX, 26 pages; v2: added computation of homotopy groups up to
dimension 3; minor improvements. to appear in Classical and Quantum Gravity | Class. Quantum Grav. 31 (2014) 055004 | 10.1088/0264-9381/31/5/055004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider maximal slices of the Myers-Perry black hole, the doubly spinning
black ring, and the Black Saturn solution. These slices are complete,
asymptotically flat Riemannian manifolds with inner boundaries corresponding to
black hole horizons. Although these spaces are simply connected as a
consequence of topolo... | [
{
"created": "Tue, 10 Sep 2013 19:01:50 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Feb 2014 16:25:39 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Alaee",
"Aghil",
""
],
[
"Kunduri",
"Hari K.",
""
],
[
"Martínez-Pedroza",
"Eduardo",
""
]
] | We consider maximal slices of the Myers-Perry black hole, the doubly spinning black ring, and the Black Saturn solution. These slices are complete, asymptotically flat Riemannian manifolds with inner boundaries corresponding to black hole horizons. Although these spaces are simply connected as a consequence of topologi... |
gr-qc/9812022 | Geoffery Ericksson | Susan M. Scott and Geoffery Ericksson | Cosmological models with isotropic singularities | 10 pages, 1 figure | Proc. Int. Sem. Math. Cosmol., Potsdam 1998, Editors: M. Rainer,
H.-J. Schmidt, WSPC Singapore, pp123-132 | null | null | gr-qc | null | In 1985 Goode and Wainwright devised the concept of an isotropic singularity.
Since that time, numerous authors have explored the interesting consequences,
in mathematical cosmology, of assuming the existence of this type of
singularity. In this paper, we collate all examples of cosmological models
which are known to... | [
{
"created": "Mon, 7 Dec 1998 05:08:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Scott",
"Susan M.",
""
],
[
"Ericksson",
"Geoffery",
""
]
] | In 1985 Goode and Wainwright devised the concept of an isotropic singularity. Since that time, numerous authors have explored the interesting consequences, in mathematical cosmology, of assuming the existence of this type of singularity. In this paper, we collate all examples of cosmological models which are known to a... |
gr-qc/0312087 | J. -F. Pascual-Sanchez | J.-F. Pascual-S\'anchez, A. San Miguel, F. Vicente (Univ. de
Valladolid) | Geometry of an accelerated rotating disk | 10 pages, LaTeX, 2 eps figs; typos corrected, added reference, minor
changes; submitted | Gen.Rel.Grav.36:2075-2083,2004 | 10.1023/B:GERG.0000038472.54323.fc | null | gr-qc physics.class-ph | null | We analyze the geometry of a rotating disk with a tangential acceleration in
the framework of the Special Theory of Relativity, using the kinematic linear
differential system that verifies the relative position vector of time-like
curves in a Fermi reference. A numerical integration of these equations for a
generic i... | [
{
"created": "Thu, 18 Dec 2003 17:46:40 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jan 2004 18:22:02 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Pascual-Sánchez",
"J. -F.",
"",
"Univ. de\n Valladolid"
],
[
"Miguel",
"A. San",
"",
"Univ. de\n Valladolid"
],
[
"Vicente",
"F.",
"",
"Univ. de\n Valladolid"
]
] | We analyze the geometry of a rotating disk with a tangential acceleration in the framework of the Special Theory of Relativity, using the kinematic linear differential system that verifies the relative position vector of time-like curves in a Fermi reference. A numerical integration of these equations for a generic ini... |
2307.02141 | Arun Rana | Arun Rana, Abhijit Pendse, Sebastian W\"uster, and Sukanta Panda | Anisotropic Inflation in Dipolar Bose-Einstein Condensates | Updated Format, More References Added | null | null | null | gr-qc cond-mat.quant-gas quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Early during the era of cosmic inflation, rotational invariance may have been
broken, only later emerging as a feature of low-energy physics. This motivates
ongoing searches for residual signatures of anisotropic space-time, for example
in the power spectrum of the cosmic microwave background. We propose that
dipolar... | [
{
"created": "Wed, 5 Jul 2023 09:32:40 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Aug 2023 18:03:18 GMT",
"version": "v2"
}
] | 2023-08-09 | [
[
"Rana",
"Arun",
""
],
[
"Pendse",
"Abhijit",
""
],
[
"Wüster",
"Sebastian",
""
],
[
"Panda",
"Sukanta",
""
]
] | Early during the era of cosmic inflation, rotational invariance may have been broken, only later emerging as a feature of low-energy physics. This motivates ongoing searches for residual signatures of anisotropic space-time, for example in the power spectrum of the cosmic microwave background. We propose that dipolar B... |
0806.0759 | Patrik Sandin | Patrik Sandin, Claes Uggla | Bianchi type I models with two tilted fluids | 19 pages, 2 figures | Class.Quant.Grav.25:225013,2008 | 10.1088/0264-9381/25/22/225013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate expanding Bianchi type I models with two tilted
fluids with linear equations of state. Individually the fluids have non-zero
energy fluxes w.r.t. the symmetry surfaces, but these cancel each other because
of the Codazzi constraint. Asymptotically toward the past the solutions
approach Kas... | [
{
"created": "Wed, 4 Jun 2008 12:30:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sandin",
"Patrik",
""
],
[
"Uggla",
"Claes",
""
]
] | In this paper we investigate expanding Bianchi type I models with two tilted fluids with linear equations of state. Individually the fluids have non-zero energy fluxes w.r.t. the symmetry surfaces, but these cancel each other because of the Codazzi constraint. Asymptotically toward the past the solutions approach Kasne... |
1905.03529 | Titus K Mathew | Krishna P B and Titus K Mathew | Does Holographic equipartition demand a pure cosmological constant? | 12 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spacial expansion of the universe could be described as a tendency for
satisfying holographic equipartition which inevitably demands the presence of
dark energy. We explore whether this novel idea proposed by Padmanabhan give
any additional insights into the nature of dark energy. In particular, we
obtain the con... | [
{
"created": "Thu, 9 May 2019 11:06:50 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2019 11:36:05 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Mar 2020 11:37:58 GMT",
"version": "v3"
}
] | 2020-03-10 | [
[
"B",
"Krishna P",
""
],
[
"Mathew",
"Titus K",
""
]
] | The spacial expansion of the universe could be described as a tendency for satisfying holographic equipartition which inevitably demands the presence of dark energy. We explore whether this novel idea proposed by Padmanabhan give any additional insights into the nature of dark energy. In particular, we obtain the const... |
gr-qc/9710111 | Toni Arbona | A. Arbona, C. Bona, J. Carot, L. Mas, J. Masso, J. Stela | Stuffed Black Holes | 12 pages, Latex, 4 postscript figures, corrected some typos, new
section about physical interpretation | Phys.Rev. D57 (1998) 2397-2402 | 10.1103/PhysRevD.57.2397 | null | gr-qc | null | Initial data corresponding to spacetimes containing black holes are
considered in the time symmetric case. The solutions are obtained by matching
across the apparent horizon different, conformally flat, spatial metrics. The
exterior metric is the vacuum solution obtained by the well known conformal
imaging method. Th... | [
{
"created": "Fri, 24 Oct 1997 11:13:01 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Feb 1998 10:47:00 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Arbona",
"A.",
""
],
[
"Bona",
"C.",
""
],
[
"Carot",
"J.",
""
],
[
"Mas",
"L.",
""
],
[
"Masso",
"J.",
""
],
[
"Stela",
"J.",
""
]
] | Initial data corresponding to spacetimes containing black holes are considered in the time symmetric case. The solutions are obtained by matching across the apparent horizon different, conformally flat, spatial metrics. The exterior metric is the vacuum solution obtained by the well known conformal imaging method. The ... |
2312.16224 | Himanshu Chaudhary | Dhruv Arora, Muhammad Yasir, Himanshu Chaudhary, Faisal Javed, G.
Mustafa, Xia Tiecheng, Farruh Atamurotov | Joule-Thomson expansion and tidal force effects of AdS black holes
surrounded by Chaplygin dark fluid | 15 pages, 13 figures, | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study examines a recently hypothesized black hole. We study the
Joule-Thomson coefficient, the inversion temperature and also the isenthalpic
curves in the $T_i -P_i$ plane. A comparison is made between the Van der Waals
fluid and the black hole to study their similarities and differences. The
Joule-Thomson coef... | [
{
"created": "Sun, 24 Dec 2023 15:27:31 GMT",
"version": "v1"
}
] | 2023-12-29 | [
[
"Arora",
"Dhruv",
""
],
[
"Yasir",
"Muhammad",
""
],
[
"Chaudhary",
"Himanshu",
""
],
[
"Javed",
"Faisal",
""
],
[
"Mustafa",
"G.",
""
],
[
"Tiecheng",
"Xia",
""
],
[
"Atamurotov",
"Farruh",
""
]
] | This study examines a recently hypothesized black hole. We study the Joule-Thomson coefficient, the inversion temperature and also the isenthalpic curves in the $T_i -P_i$ plane. A comparison is made between the Van der Waals fluid and the black hole to study their similarities and differences. The Joule-Thomson coeffi... |
1210.6191 | Bernadette Lessel | Bernadette Lessel | Geometry of higher dimensional black holes | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article investigates higher dimensional vacuum solutions of the Einstein
equations. Generalizations of the definitions of spherical and axial symmetry
to higher dimensions are discussed before analyzing specific solutions bearing
one of these symmetries. The effective motions of the Tangherlini metric are
calcul... | [
{
"created": "Tue, 23 Oct 2012 10:50:53 GMT",
"version": "v1"
}
] | 2012-10-24 | [
[
"Lessel",
"Bernadette",
""
]
] | This article investigates higher dimensional vacuum solutions of the Einstein equations. Generalizations of the definitions of spherical and axial symmetry to higher dimensions are discussed before analyzing specific solutions bearing one of these symmetries. The effective motions of the Tangherlini metric are calculat... |
1302.6778 | Deborah A. Konkowski | Deborah A. Konkowski, Thomas M. Helliwell | Properties of a Two-Sphere Singularity | 3 pages, no figures, submitted to the Proceedings of the 13th Marcel
Grossmann Meeting - MG13, Stockholm, July 1-7, 2012 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently B\"ohmer and Lobo have shown that a metric due to Florides can be
extended to reveal a classical singularity that has the form of a two-sphere.
Here we discuss and expand on the classical singularity properties and then
show the classical singularity is not healed by a quantum analysis.
| [
{
"created": "Wed, 27 Feb 2013 14:13:13 GMT",
"version": "v1"
}
] | 2013-02-28 | [
[
"Konkowski",
"Deborah A.",
""
],
[
"Helliwell",
"Thomas M.",
""
]
] | Recently B\"ohmer and Lobo have shown that a metric due to Florides can be extended to reveal a classical singularity that has the form of a two-sphere. Here we discuss and expand on the classical singularity properties and then show the classical singularity is not healed by a quantum analysis. |
2003.10845 | S. I. Kruglov | S.I. Kruglov | Dyonic and magnetized black holes based on nonlinear electrodynamics | 20 pages, 5 figures, 2 tables, accepted in EPJC | Eur. Phys. J. C (2020) 80:250 | 10.1140/epjc/s10052-020-7809-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new model of nonlinear electrodynamics with two dimensional
parameters. The phenomenon of vacuum birefringence, the principles of causality
and unitarity were studied. It was shown that there is no a singularity of the
electric field in the center of point-like charges. Corrections to the Coulomb
law as ... | [
{
"created": "Fri, 20 Mar 2020 13:22:11 GMT",
"version": "v1"
}
] | 2020-06-24 | [
[
"Kruglov",
"S. I.",
""
]
] | We propose a new model of nonlinear electrodynamics with two dimensional parameters. The phenomenon of vacuum birefringence, the principles of causality and unitarity were studied. It was shown that there is no a singularity of the electric field in the center of point-like charges. Corrections to the Coulomb law as $r... |
gr-qc/0312096 | Achilles D. Speliotopoulos | Raymond Y. Chiao and Achilles D. Speliotopoulos | Towards MIGO, the Matter-wave Interferometric Gravitational-wave
Observatory, and the Intersection of Quantum Mechanics with General
Relativity | Thirty-two pages with 7 figures. Written in LaTeX. To appear in
Journal of Modern Optics. Galley proofs corrections included | null | 10.1080/09500340408233603 | null | gr-qc astro-ph hep-th physics.atom-ph | null | A dynamical, non-Euclidean spacetime geometry in general relativity theory
implies the possibility of gravitational radiation. Here we explore novel
methods of detecting such radiation from astrophysical sources by means of
matter-wave interferometers (MIGOs), using atomic beams emanating from
supersonic atomic sourc... | [
{
"created": "Mon, 22 Dec 2003 20:20:02 GMT",
"version": "v1"
},
{
"created": "Tue, 23 Dec 2003 22:02:54 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Dec 2003 18:52:33 GMT",
"version": "v3"
},
{
"created": "Thu, 11 Mar 2004 22:54:37 GMT",
"version": "v4"
}
] | 2015-06-25 | [
[
"Chiao",
"Raymond Y.",
""
],
[
"Speliotopoulos",
"Achilles D.",
""
]
] | A dynamical, non-Euclidean spacetime geometry in general relativity theory implies the possibility of gravitational radiation. Here we explore novel methods of detecting such radiation from astrophysical sources by means of matter-wave interferometers (MIGOs), using atomic beams emanating from supersonic atomic sources... |
gr-qc/9810068 | Michael P. Ryan Jr. | Octavio Obregon and Michael P. Ryan, Jr | A family of exact solutions for unpolarized Gowdy models | 13 pages, 11 figures, Plain TeX | null | null | null | gr-qc | null | Unpolarized Gowdy models are inhomogeneous cosmological models that depend on
time and one spatial variable and have complicated nonlinear equations of
motion. There are two topologies associated with these models, a three-torus
and a one-sphere cross a two-sphere. The three-torus models have been used for
numerical ... | [
{
"created": "Wed, 21 Oct 1998 01:08:58 GMT",
"version": "v1"
}
] | 2012-08-27 | [
[
"Obregon",
"Octavio",
""
],
[
"Ryan,",
"Michael P.",
"Jr"
]
] | Unpolarized Gowdy models are inhomogeneous cosmological models that depend on time and one spatial variable and have complicated nonlinear equations of motion. There are two topologies associated with these models, a three-torus and a one-sphere cross a two-sphere. The three-torus models have been used for numerical st... |
1709.05134 | Francesco Alessio | Francesco Alessio, Giampiero Esposito | On the structure and applications of the Bondi-Metzner-Sachs group | 62 pages, 9 figures. Misprints have been amended and two important
references have been added | Int.J.Geom.Meth.Mod.Phys. 15 (2018) no.02 | 10.1142/S0219887818300027 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is a pedagogical review dedicated to a modern description of the
Bondi-Metzner-Sachs group. The curved space-times that will be taken into
account are the ones that suitably approach, at infinity, Minkowski space-time.
In particular we will focus on asymptotically flat space-times. In this work
the concept ... | [
{
"created": "Fri, 15 Sep 2017 09:51:22 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2017 14:43:31 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Jan 2019 17:44:41 GMT",
"version": "v3"
}
] | 2019-01-24 | [
[
"Alessio",
"Francesco",
""
],
[
"Esposito",
"Giampiero",
""
]
] | This work is a pedagogical review dedicated to a modern description of the Bondi-Metzner-Sachs group. The curved space-times that will be taken into account are the ones that suitably approach, at infinity, Minkowski space-time. In particular we will focus on asymptotically flat space-times. In this work the concept of... |
2101.05971 | Matt Visser | Thomas Berry (Victoria University of Wellington) and Matt Visser
(Victoria University of Wellington) | Lorentz boosts and Wigner rotations: self-adjoint complexified
quaternions | 21 pages; no figures | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Herein we shall consider Lorentz boosts and Wigner rotations from a
(complexified) quaternionic point of view. We shall demonstrate that for a
suitably defined self-adjoint complex quaternionic 4-velocity, pure Lorentz
boosts can be phrased in terms of the quaternion square root of the relative
4-velocity connecting ... | [
{
"created": "Fri, 15 Jan 2021 05:23:20 GMT",
"version": "v1"
}
] | 2021-01-18 | [
[
"Berry",
"Thomas",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | Herein we shall consider Lorentz boosts and Wigner rotations from a (complexified) quaternionic point of view. We shall demonstrate that for a suitably defined self-adjoint complex quaternionic 4-velocity, pure Lorentz boosts can be phrased in terms of the quaternion square root of the relative 4-velocity connecting th... |
2406.09479 | Oyvind Gron | {\O}yvind G. Gr{\o}n | Anisotropic Generalization of the {\Lambda}CDM Universe Model with
Application to the Hubble Tension | 28 pages | Symmetry 2024, 16(5), 564; | 10.3390/sym16050564 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | I deduce an exact and analytic Bianchi type I solution of Einsteins field
equations, which generalizes the isotropic LambdaCDM universe model to a
corresponding model with anisotropic expansion. The main point of the article
is to present the anisotropic generalization of the LambdaCDM universe model in
a way suitabl... | [
{
"created": "Thu, 13 Jun 2024 11:16:03 GMT",
"version": "v1"
}
] | 2024-06-17 | [
[
"Grøn",
"Øyvind G.",
""
]
] | I deduce an exact and analytic Bianchi type I solution of Einsteins field equations, which generalizes the isotropic LambdaCDM universe model to a corresponding model with anisotropic expansion. The main point of the article is to present the anisotropic generalization of the LambdaCDM universe model in a way suitable ... |
gr-qc/0407077 | Michael Kuchiev | M.Yu.Kuchiev, V.V.Flambaum | Reflection on event horizon and escape of particles from confinement
inside black holes | Revtex, 7 pages | null | null | null | gr-qc astro-ph hep-th | null | Several recently found properties of the event horizon of black holes are
discussed. One of them is the reflection of the incoming particles on the
horizon. A particle approaching the black hole can bounce on the horizon back,
into the outside world, which drastically reduces the absorption cross section
in the infra... | [
{
"created": "Tue, 20 Jul 2004 14:52:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kuchiev",
"M. Yu.",
""
],
[
"Flambaum",
"V. V.",
""
]
] | Several recently found properties of the event horizon of black holes are discussed. One of them is the reflection of the incoming particles on the horizon. A particle approaching the black hole can bounce on the horizon back, into the outside world, which drastically reduces the absorption cross section in the infrare... |
gr-qc/9604030 | Nobuyuki Sakai | Yoonbai Kim, Kei-ichi Maeda and Nobuyuki Sakai | Monopole-Bubble in Early Universe | 25 pages, latex | Nucl.Phys. B481 (1996) 453-478 | 10.1016/S0550-3213(96)90151-0 | DPNU-94-55, SNUTP-96-031, WU-AP/57/96 | gr-qc astro-ph hep-th | null | The nucleation and evolution of bubbles are investigated in the model of an
$O(3)$-symmetric scalar field coupled to gravity in the high temperature limit.
It is shown that, in addition to the well-known bubble of which the inside
region is true vacuum, there exists another decay channel at high temperature
which is ... | [
{
"created": "Sun, 14 Apr 1996 17:50:14 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Kim",
"Yoonbai",
""
],
[
"Maeda",
"Kei-ichi",
""
],
[
"Sakai",
"Nobuyuki",
""
]
] | The nucleation and evolution of bubbles are investigated in the model of an $O(3)$-symmetric scalar field coupled to gravity in the high temperature limit. It is shown that, in addition to the well-known bubble of which the inside region is true vacuum, there exists another decay channel at high temperature which is de... |
2005.07516 | Charis Anastopoulos | Charis Anastopoulos and Konstantina Savvidou | How black holes store information in high-order correlations | 6 pages, honorable mention at the 2020 Gravity Research Foundation
essay competition | null | 10.1142/S0218271820430117 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explain how Hawking radiation stores significant amount of information in
high-order correlations of quantum fields. This information can be retrieved by
multi-time measurements on the quantum fields close to the black hole horizon.
This result requires no assumptions about quantum gravity, it takes into
account t... | [
{
"created": "Fri, 15 May 2020 13:04:16 GMT",
"version": "v1"
}
] | 2021-02-03 | [
[
"Anastopoulos",
"Charis",
""
],
[
"Savvidou",
"Konstantina",
""
]
] | We explain how Hawking radiation stores significant amount of information in high-order correlations of quantum fields. This information can be retrieved by multi-time measurements on the quantum fields close to the black hole horizon. This result requires no assumptions about quantum gravity, it takes into account the... |
gr-qc/9501007 | null | Patricio S. Letelier and Luis E. Mendes | Inflating Defects | 7 pages, uuencoded, Latex, 2 PostScript figures | null | null | null | gr-qc | null | A Kantowski-Sachs cosmological model with an O(3) global defect as a source
is studied in the context of the topological inflation scenario.
| [
{
"created": "Tue, 10 Jan 1995 21:26:23 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Letelier",
"Patricio S.",
""
],
[
"Mendes",
"Luis E.",
""
]
] | A Kantowski-Sachs cosmological model with an O(3) global defect as a source is studied in the context of the topological inflation scenario. |
gr-qc/0012050 | Maria Emilia | V. B. Bezerra (UFPb), R. M. Teixeira Filho (UFPb and UFBA), G. Grebot
(UnB) and M. E. X. Guimaraes (UnB) | Vacuum Polarization in the Spacetime of a Scalar-Tensor Cosmic String | 11 pages, LATEX file, 2 eps figures | Mod.Phys.Lett.A16:1565-1572,2001 | 10.1142/S0217732301004662 | null | gr-qc | null | We study the vacuum polarization effect in the spacetime generated by a
magnetic flux cosmic string in the framework of a scalar-tensor gravity. The
vacuum expectation values of the energy-momentum tensor of a conformally
coupled scalar field are calculated. The dilaton's contribution to the vacuum
polarization effec... | [
{
"created": "Thu, 14 Dec 2000 21:25:35 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Bezerra",
"V. B.",
"",
"UFPb"
],
[
"Filho",
"R. M. Teixeira",
"",
"UFPb and UFBA"
],
[
"Grebot",
"G.",
"",
"UnB"
],
[
"Guimaraes",
"M. E. X.",
"",
"UnB"
]
] | We study the vacuum polarization effect in the spacetime generated by a magnetic flux cosmic string in the framework of a scalar-tensor gravity. The vacuum expectation values of the energy-momentum tensor of a conformally coupled scalar field are calculated. The dilaton's contribution to the vacuum polarization effect ... |
1111.2468 | S. Hamid Mehdipour | S. Hamid Mehdipour | Entropic force approach to noncommutative Schwarzschild black holes
signals a failure of current physical ideas | 15 pages, 2 figures, new references added, minor revision, Title
changed, to appear in EPJ Plus | Eur. Phys. J. Plus (2012) 127: 80 | 10.1140/epjp/i2012-12080-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a new perspective of gravitational-thermodynamic duality as an
entropic force arising from alterations in the information connected to the
positions of material bodies is found. In this paper, we generalize some
aspects of this model in the presence of noncommutative Schwarzschild black
hole by applying the... | [
{
"created": "Thu, 10 Nov 2011 12:57:37 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2011 12:24:19 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Jan 2012 12:06:17 GMT",
"version": "v3"
},
{
"created": "Tue, 3 Jul 2012 22:08:33 GMT",
"version": "v4"
}
] | 2012-07-23 | [
[
"Mehdipour",
"S. Hamid",
""
]
] | Recently, a new perspective of gravitational-thermodynamic duality as an entropic force arising from alterations in the information connected to the positions of material bodies is found. In this paper, we generalize some aspects of this model in the presence of noncommutative Schwarzschild black hole by applying the m... |
gr-qc/0408098 | Michael J. W. Hall | Michael J. W. Hall | Exact uncertainty approach in quantum mechanics and quantum gravity | Latex, 14 pages; plenary talk presented at the 4th Australasian
Conference on General Relativity and Gravitation (Melbourne, January 7-9,
2004); Proceedings to appear in GRG | Gen.Rel.Grav.37:1505-1515,2005 | 10.1007/s10714-005-0131-y | null | gr-qc quant-ph | null | The assumption that an ensemble of classical particles is subject to
nonclassical momentum fluctuations, with the fluctuation uncertainty fully
determined by the position uncertainty, has been shown to lead from the
classical equations of motion to the Schroedinger equation. This 'exact
uncertainty' approach may be g... | [
{
"created": "Tue, 31 Aug 2004 00:36:34 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hall",
"Michael J. W.",
""
]
] | The assumption that an ensemble of classical particles is subject to nonclassical momentum fluctuations, with the fluctuation uncertainty fully determined by the position uncertainty, has been shown to lead from the classical equations of motion to the Schroedinger equation. This 'exact uncertainty' approach may be gen... |
2009.01158 | Lorenzo Iorio | Lorenzo Iorio | The short-period S-stars S4711, S62, S4714 and the Lense-Thirring effect
due to the spin of Sgr A$^\ast$ | LateX2e, 14 pages, 5 tables, 3 figures. Sign in front of the
periastron precession corrected in Equation (4) and Equation (10). Pictures
for the periastron precessions replaced in Figures (1) to (3). Table 4 for
the periastron precessions corrected | Astrophys. J. 904 (2020) 186 | 10.3847/1538-4357/abbfb5 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, some S-stars (S4711, S62, S4714) orbiting the supermassive black
hole (SMBH) in Sgr A$^\ast$ with short orbital periods ($7.6\,\mathrm{yr}\leq
P_\mathrm{b}\leq 12\,\mathrm{yr}$) were discovered. It was suggested that they
may be used to measure the general relativistic Lense-Thirring (LT) precessions
of the... | [
{
"created": "Wed, 2 Sep 2020 16:02:52 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Oct 2020 15:09:32 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Nov 2020 20:48:52 GMT",
"version": "v3"
},
{
"created": "Wed, 14 Dec 2022 15:25:33 GMT",
"version": "v4"
}
] | 2022-12-15 | [
[
"Iorio",
"Lorenzo",
""
]
] | Recently, some S-stars (S4711, S62, S4714) orbiting the supermassive black hole (SMBH) in Sgr A$^\ast$ with short orbital periods ($7.6\,\mathrm{yr}\leq P_\mathrm{b}\leq 12\,\mathrm{yr}$) were discovered. It was suggested that they may be used to measure the general relativistic Lense-Thirring (LT) precessions of their... |
1205.1506 | Gopi Kant Goswami Dr | G.K.Goswami and Mandwi Trivedi | A Cosmological Model of Thermodynamic Open Universe | 10,Accepted for publication in International journal of theoretical
physics,doi:10.1007/s10773-012-1142-6 | null | 10.1007/s10773-012-1142-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we have given a generalisation of the earlier work by Prigogine
et al. who have constructed a phenomenological model of entropy production via
particle creation in the very early universe generated out of the vacuum rather
than from a singularity, by including radiation also as the energy source and
tri... | [
{
"created": "Mon, 7 May 2012 16:44:47 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Goswami",
"G. K.",
""
],
[
"Trivedi",
"Mandwi",
""
]
] | In this paper we have given a generalisation of the earlier work by Prigogine et al. who have constructed a phenomenological model of entropy production via particle creation in the very early universe generated out of the vacuum rather than from a singularity, by including radiation also as the energy source and tried... |
2106.07028 | Partha Nandi | Partha Nandi, Partha Ghose | A Conformally Invariant Unified Theory of Maxwell Fields and Linearized
Gravity as Emergent Fields | null | null | null | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | A Lorentz and conformally invariant `Schr\"{o}dinger-like' equation for a
massless complex scalar function $\psi$ is derived from an invariant action,
and it is shown how the same $\psi$ can be used to calculate both the
gravitational field $h_{\mu\nu}$ of linearized Einstein gravity in the TT gauge
and the electroma... | [
{
"created": "Sun, 13 Jun 2021 15:37:13 GMT",
"version": "v1"
}
] | 2021-06-15 | [
[
"Nandi",
"Partha",
""
],
[
"Ghose",
"Partha",
""
]
] | A Lorentz and conformally invariant `Schr\"{o}dinger-like' equation for a massless complex scalar function $\psi$ is derived from an invariant action, and it is shown how the same $\psi$ can be used to calculate both the gravitational field $h_{\mu\nu}$ of linearized Einstein gravity in the TT gauge and the electromagn... |
2107.01115 | Vjacheslav Prokopov | V.Prokopov, S.Alexeyev, O.Zenin | Black Hole Shadows Constrain Extended Gravity | null | null | 10.1134/S1063776122070093 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first images of black hole shadows open new possibilities to constrain
modern extended gravity theories. We present the method of shadow background
calculation for black hole solutions in the form of Taylor series where $g_{11}
= - g_{00}^{-1}$. The method is extended to general non-rotating case $g_{11}
\neq - g... | [
{
"created": "Fri, 2 Jul 2021 15:01:07 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jul 2021 11:42:32 GMT",
"version": "v2"
},
{
"created": "Fri, 8 Apr 2022 13:03:00 GMT",
"version": "v3"
}
] | 2022-09-07 | [
[
"Prokopov",
"V.",
""
],
[
"Alexeyev",
"S.",
""
],
[
"Zenin",
"O.",
""
]
] | The first images of black hole shadows open new possibilities to constrain modern extended gravity theories. We present the method of shadow background calculation for black hole solutions in the form of Taylor series where $g_{11} = - g_{00}^{-1}$. The method is extended to general non-rotating case $g_{11} \neq - g_{... |
1611.01269 | Adam Rogers | Adam Rogers | Escape and Trapping of Low-Frequency Gravitationally Lensed Rays by
Compact Objects within Plasma | 10 pages, 4 figures. Updated to match published version | MNRAS 465, 2151-2159 (2017) | 10.1093/mnras/stw2829 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the gravitational lensing of rays emitted by a compact object
(CO) within a distribution of plasma with power-law density $\propto r^{-h}$.
For the simplest case of a cloud of spherically symmetric cold non-magnetized
plasma, the diverging effect of the plasma and the converging effect of
gravitational le... | [
{
"created": "Fri, 4 Nov 2016 06:15:50 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 2017 03:42:42 GMT",
"version": "v2"
}
] | 2017-01-23 | [
[
"Rogers",
"Adam",
""
]
] | We consider the gravitational lensing of rays emitted by a compact object (CO) within a distribution of plasma with power-law density $\propto r^{-h}$. For the simplest case of a cloud of spherically symmetric cold non-magnetized plasma, the diverging effect of the plasma and the converging effect of gravitational lens... |
1210.7222 | Jack Gegenberg | Jack Gegenberg, Viqar Husain | Solvable model for quantum gravity | null | null | 10.1088/0264-9381/30/6/065023 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a type of geometric theory with a non-dynamical one-form field. Its
dynamical variables are an $su(2)$ gauge field and a triad of $su(2)$ valued
one-forms. Hamiltonian decomposition reveals that the theory has a true
Hamiltonian, together with spatial diffeomorphism and Gauss law constraints,
which generate ... | [
{
"created": "Fri, 26 Oct 2012 19:23:03 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jun 2014 14:19:57 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Gegenberg",
"Jack",
""
],
[
"Husain",
"Viqar",
""
]
] | We study a type of geometric theory with a non-dynamical one-form field. Its dynamical variables are an $su(2)$ gauge field and a triad of $su(2)$ valued one-forms. Hamiltonian decomposition reveals that the theory has a true Hamiltonian, together with spatial diffeomorphism and Gauss law constraints, which generate th... |
2211.01399 | Piero Rettegno | Thibault Damour, Piero Rettegno | Strong-field scattering of two black holes: Numerical Relativity meets
Post-Minkowskian gravity | 16 pages, 7 figures, 2 tables | null | 10.1103/PhysRevD.107.064051 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare numerical relativity (NR) data on the scattering of equal-mass,
non-spinning binary black holes to various analytical predictions based on
post-Minkowskian (PM) results. While the usual sequence of PM-expanded
scattering angles shows a rather poor convergence towards NR data, we find that
a reformulation o... | [
{
"created": "Wed, 2 Nov 2022 18:00:10 GMT",
"version": "v1"
},
{
"created": "Sat, 4 Mar 2023 10:06:24 GMT",
"version": "v2"
}
] | 2023-04-05 | [
[
"Damour",
"Thibault",
""
],
[
"Rettegno",
"Piero",
""
]
] | We compare numerical relativity (NR) data on the scattering of equal-mass, non-spinning binary black holes to various analytical predictions based on post-Minkowskian (PM) results. While the usual sequence of PM-expanded scattering angles shows a rather poor convergence towards NR data, we find that a reformulation of ... |
2205.07088 | Fabio Scardigli | Fabio Scardigli, Gaetano Lambiase | Planck Stars from a Scale-dependent Gravity theory | 15 pages, 3 figures. Final version, to appear in Physical Review D | null | 10.1103/PhysRevD.107.104001 | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | Scale dependence of fundamental physical parameters is a generic feature of
ordinary quantum field theory. When applied to gravity, this idea produces
effective actions generically containing a running Newtonian coupling constant,
from which new (spherically symmetric) black hole spacetimes can be inferred.
As a mini... | [
{
"created": "Sat, 14 May 2022 16:04:09 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Apr 2023 17:41:46 GMT",
"version": "v2"
}
] | 2023-05-03 | [
[
"Scardigli",
"Fabio",
""
],
[
"Lambiase",
"Gaetano",
""
]
] | Scale dependence of fundamental physical parameters is a generic feature of ordinary quantum field theory. When applied to gravity, this idea produces effective actions generically containing a running Newtonian coupling constant, from which new (spherically symmetric) black hole spacetimes can be inferred. As a minimu... |
gr-qc/0504093 | Carlos Kozameh | Carlos N. Kozameh and Ezra T. Newman | Electromagnetic Dipole Radiation Fields, Shear-Free Congruences and
Complex Center of Charge World Lines | 17 pages | Class.Quant.Grav. 22 (2005) 4667-4678 | 10.1088/0264-9381/22/22/002 | null | gr-qc | null | We show that for asymptotically vanishing Maxwell fields in Minkowski space
with non-vanishing total charge, one can find a unique geometric structure, a
null direction field, at null infinity. From this structure a unique complex
analytic world-line in complex Minkowski space that can be found and then
identified as... | [
{
"created": "Wed, 20 Apr 2005 19:22:05 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Kozameh",
"Carlos N.",
""
],
[
"Newman",
"Ezra T.",
""
]
] | We show that for asymptotically vanishing Maxwell fields in Minkowski space with non-vanishing total charge, one can find a unique geometric structure, a null direction field, at null infinity. From this structure a unique complex analytic world-line in complex Minkowski space that can be found and then identified as t... |
gr-qc/0310111 | Michael Mattes Dr. | Michael Mattes | General Relativity as a SO(3) Gauge-Theory | thesis of doctorate in German | null | null | null | gr-qc | null | The Einsteinian Theory of Gravitation ("General Theory of Relativity") is
founded essentially; on the reception that the geometrical properties of the
4-dimensional space-time continuum are defined from the matter in it. Contrary
to this, in the Newtonian Mechanics space and time obey a absolute,
matter-independent m... | [
{
"created": "Mon, 27 Oct 2003 15:48:49 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mattes",
"Michael",
""
]
] | The Einsteinian Theory of Gravitation ("General Theory of Relativity") is founded essentially; on the reception that the geometrical properties of the 4-dimensional space-time continuum are defined from the matter in it. Contrary to this, in the Newtonian Mechanics space and time obey a absolute, matter-independent mea... |
1608.05299 | P Prasia | P Prasia and V C Kuriakose | Quasinormal Modes and Thermodynamics of Linearly Charged BTZ Black holes
in Massive Gravity in (Anti)de Sitter Space Time | Prepared for submitting to EPJ | Eur. Phys. J. C (2017) 77:27 | 10.1140/epjc/s10052-016-4591-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study the Quasi Normal Modes(QNMs) under massless scalar
perturbations and the thermodynamics of linearly charged BTZ black holes in
massive gravity in the (Anti)de Sitter((A)dS) space time. It is found that the
behavior of QNMs changes with the massive parameter and also with the charge of
the black ... | [
{
"created": "Thu, 18 Aug 2016 15:35:59 GMT",
"version": "v1"
}
] | 2017-01-17 | [
[
"Prasia",
"P",
""
],
[
"Kuriakose",
"V C",
""
]
] | In this work we study the Quasi Normal Modes(QNMs) under massless scalar perturbations and the thermodynamics of linearly charged BTZ black holes in massive gravity in the (Anti)de Sitter((A)dS) space time. It is found that the behavior of QNMs changes with the massive parameter and also with the charge of the black ho... |
2305.11565 | Marie-No\"elle C\'el\'erier | Marie-No\"elle C\'el\'erier | Interior spacetimes sourced by stationary differentially rotating
irrotational cylindrical fluids. Perfect fluids | 20 pages, no figure | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In a recent series of papers new exact analytical solutions of the Einstein
equations representing interior spacetimes sourced by stationary rigidly
rotating cylinders of different kinds of fluids have been displayed, [Phys.
Rev. D {\bf 104}, 064040 (2021); J. Math. Phys. {\bf 64}, 022501 (2023); J.
Math. Phys. {\bf ... | [
{
"created": "Fri, 19 May 2023 10:04:49 GMT",
"version": "v1"
},
{
"created": "Fri, 15 Dec 2023 10:17:50 GMT",
"version": "v2"
}
] | 2023-12-18 | [
[
"Célérier",
"Marie-Noëlle",
""
]
] | In a recent series of papers new exact analytical solutions of the Einstein equations representing interior spacetimes sourced by stationary rigidly rotating cylinders of different kinds of fluids have been displayed, [Phys. Rev. D {\bf 104}, 064040 (2021); J. Math. Phys. {\bf 64}, 022501 (2023); J. Math. Phys. {\bf 64... |
1801.01523 | Lavinia Heisenberg | Lavinia Heisenberg | Scalar-Vector-Tensor Gravity Theories | 5 pages, formulations improved and references added | null | 10.1088/1475-7516/2018/10/054 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct the consistent ghost-free covariant scalar-vector-tensor gravity
theories with second order equations of motion with derivative interactions. We
impose locality, unitarity, Lorentz invariance and pseudo-Riemannian geometry
as the fundamental terms. In the tensor sector we require diffeomorphism
invarianc... | [
{
"created": "Thu, 4 Jan 2018 19:36:09 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Feb 2018 09:36:20 GMT",
"version": "v2"
},
{
"created": "Mon, 26 Feb 2018 14:44:57 GMT",
"version": "v3"
}
] | 2018-11-07 | [
[
"Heisenberg",
"Lavinia",
""
]
] | We construct the consistent ghost-free covariant scalar-vector-tensor gravity theories with second order equations of motion with derivative interactions. We impose locality, unitarity, Lorentz invariance and pseudo-Riemannian geometry as the fundamental terms. In the tensor sector we require diffeomorphism invariance,... |
gr-qc/0503006 | Peter Dunsby | Gerold Betschart, Caroline Zunckel, Peter Dunsby and Mattias Marklund | Primordial magnetic seed field amplification by gravitational waves | Matches published version | Phys.Rev. D72 (2005) 123514 | 10.1103/PhysRevD.72.123514 | null | gr-qc astro-ph hep-th | null | Using second-order gauge-invariant perturbation theory, a self-consistent
framework describing the non-linear coupling between gravitational waves and a
large-scale homogeneous magnetic field is presented. It is shown how this
coupling may be used to amplify seed magnetic fields to strengths needed to
support the gal... | [
{
"created": "Tue, 1 Mar 2005 19:13:00 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jan 2006 14:03:38 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Betschart",
"Gerold",
""
],
[
"Zunckel",
"Caroline",
""
],
[
"Dunsby",
"Peter",
""
],
[
"Marklund",
"Mattias",
""
]
] | Using second-order gauge-invariant perturbation theory, a self-consistent framework describing the non-linear coupling between gravitational waves and a large-scale homogeneous magnetic field is presented. It is shown how this coupling may be used to amplify seed magnetic fields to strengths needed to support the galac... |
gr-qc/9808047 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | Could we observe the discreteness of Quantum-Gravity length and area
operators ? | 7 pages, LaTex. (To appear in the proceedings of 7-th International
Colloquium "Quantum Groups and Integrable Systems", Prague, 18-20 June 1998.) | Czech.J.Phys. 48 (1998) 1279-1284 | 10.1023/A:1021620214709 | NEIP-98-008 | gr-qc | null | Several proposals for Quantum Gravity involve length and area operators with
discrete eigenvalues. I show that the analyses of some simple procedures for
the measurement of areas and lengths suggest that this discreteness
characterizing the formalism might not be observable. I also discuss a possible
relation with th... | [
{
"created": "Mon, 17 Aug 1998 15:22:48 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | Several proposals for Quantum Gravity involve length and area operators with discrete eigenvalues. I show that the analyses of some simple procedures for the measurement of areas and lengths suggest that this discreteness characterizing the formalism might not be observable. I also discuss a possible relation with the ... |
0902.0416 | Koutarou Kyutoku | Masaru Shibata, Koutarou Kyutoku, Tetsuro Yamamoto, Keisuke Taniguchi | Gravitational waves from black hole-neutron star binaries I:
Classification of waveforms | 25 pages, 3 jpg figures, accepted for publication in PRD; erratum is
added on Jul 23. 2012 | Phys.Rev.D79:044030,2009 | 10.1103/PhysRevD.79.044030 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using our new numerical-relativity code SACRA, long-term simulations for
inspiral and merger of black hole (BH)-neutron star (NS) binaries are
performed, focusing particularly on gravitational waveforms. As the initial
conditions, BH-NS binaries in a quasiequilibrium state are prepared in a
modified version of the mo... | [
{
"created": "Tue, 3 Feb 2009 01:25:58 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Jul 2012 16:22:50 GMT",
"version": "v2"
}
] | 2012-07-24 | [
[
"Shibata",
"Masaru",
""
],
[
"Kyutoku",
"Koutarou",
""
],
[
"Yamamoto",
"Tetsuro",
""
],
[
"Taniguchi",
"Keisuke",
""
]
] | Using our new numerical-relativity code SACRA, long-term simulations for inspiral and merger of black hole (BH)-neutron star (NS) binaries are performed, focusing particularly on gravitational waveforms. As the initial conditions, BH-NS binaries in a quasiequilibrium state are prepared in a modified version of the movi... |
1111.7269 | Asrin Abdolmaleki | K. Karami, S. Asadzadeh, A. Abdolmaleki, Z. Safari | Holographic f(T)-gravity model with power-law entropy correction | 21 pages, 13 figures, 3 tables | Phys. Rev. D 88, 084034 (2013) | 10.1103/PhysRevD.88.084034 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a correspondence between the f(T)-gravity with the power-law entropy
corrected version of the holographic dark energy model, we reconstruct the
holographic f(T)-gravity model with power-law entropy correction. We fit the
model parameters by using the latest observational data including type Ia
supernovea, baryo... | [
{
"created": "Tue, 29 Nov 2011 10:09:47 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Nov 2013 09:02:59 GMT",
"version": "v2"
}
] | 2013-11-06 | [
[
"Karami",
"K.",
""
],
[
"Asadzadeh",
"S.",
""
],
[
"Abdolmaleki",
"A.",
""
],
[
"Safari",
"Z.",
""
]
] | Using a correspondence between the f(T)-gravity with the power-law entropy corrected version of the holographic dark energy model, we reconstruct the holographic f(T)-gravity model with power-law entropy correction. We fit the model parameters by using the latest observational data including type Ia supernovea, baryon ... |
1503.08660 | Chris Clarkson | Chris Clarkson (Cape Town) | The general theory of secondary weak gravitational lensing | 17 pages, 2 figures | null | 10.1088/1475-7516/2015/09/033 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Weak gravitational lensing is normally assumed to have only two principle
effects: a magnification of a source and a distortion of the sources shape in
the form of a shear. However, further distortions are actually present owing to
changes in the gravitational field across the scale of the ray bundle of light
propaga... | [
{
"created": "Mon, 30 Mar 2015 13:16:20 GMT",
"version": "v1"
}
] | 2015-12-02 | [
[
"Clarkson",
"Chris",
"",
"Cape Town"
]
] | Weak gravitational lensing is normally assumed to have only two principle effects: a magnification of a source and a distortion of the sources shape in the form of a shear. However, further distortions are actually present owing to changes in the gravitational field across the scale of the ray bundle of light propagati... |
2102.04819 | Viktor Skoup\'y | Viktor Skoup\'y and Georgios Lukes-Gerakopoulos | Spinning test body orbiting around a Kerr black hole: Eccentric
equatorial orbits and their asymptotic gravitational-wave fluxes | 24 pages, 10 figures | Phys. Rev. D 103, 104045 (2021) | 10.1103/PhysRevD.103.104045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the frequency and time domain Teukolsky formalism to calculate
gravitational-wave fluxes from a spinning body on a bound eccentric equatorial
orbit around a Kerr black hole. The spinning body is represented as a point
particle following the pole-dipole approximation of the
Mathisson-Papapetrou-Dixon equations.... | [
{
"created": "Tue, 9 Feb 2021 13:40:04 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jun 2021 11:56:52 GMT",
"version": "v2"
}
] | 2021-06-02 | [
[
"Skoupý",
"Viktor",
""
],
[
"Lukes-Gerakopoulos",
"Georgios",
""
]
] | We use the frequency and time domain Teukolsky formalism to calculate gravitational-wave fluxes from a spinning body on a bound eccentric equatorial orbit around a Kerr black hole. The spinning body is represented as a point particle following the pole-dipole approximation of the Mathisson-Papapetrou-Dixon equations. R... |
2406.02111 | Alexander Hahn | Alexander Hahn, Sebastian Murk, Sukhbinder Singh, Gavin K. Brennen | Categorical Quantum Volume Operator | 18 pages, 3 figures | null | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | We present a generalization of the quantum volume operator quantifying the
volume in curved three-dimensional discrete geometries. In its standard form,
the quantum volume operator is constructed from tetrahedra whose faces are
endowed with irreducible representations of $\mathrm{SU}(2)$. Here, we show two
equivalent... | [
{
"created": "Tue, 4 Jun 2024 08:37:10 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2024 08:49:37 GMT",
"version": "v2"
}
] | 2024-06-17 | [
[
"Hahn",
"Alexander",
""
],
[
"Murk",
"Sebastian",
""
],
[
"Singh",
"Sukhbinder",
""
],
[
"Brennen",
"Gavin K.",
""
]
] | We present a generalization of the quantum volume operator quantifying the volume in curved three-dimensional discrete geometries. In its standard form, the quantum volume operator is constructed from tetrahedra whose faces are endowed with irreducible representations of $\mathrm{SU}(2)$. Here, we show two equivalent c... |
gr-qc/0306118 | Henk van Elst | Woei Chet Lim (University of Waterloo), Henk van Elst (Queen Mary,
University of London), Claes Uggla (University of Karlstad), John Wainwright
(University of Waterloo) | Asymptotic isotropization in inhomogeneous cosmology | 29 pages, LaTeX2e (10pt), no figures, to be submitted for publication
to Physical Review D | Phys.Rev. D69 (2004) 103507 | 10.1103/PhysRevD.69.103507 | QMUL-AU-2003-002 | gr-qc astro-ph math-ph math.MP | null | In this paper we investigate asymptotic isotropization. We derive the
asymptotic dynamics of spatially inhomogeneous cosmological models with a
perfect fluid matter source and a positive cosmological constant near the de
Sitter equilibrium state at late times, and near the flat FL equilibrium state
at early times. Ou... | [
{
"created": "Thu, 26 Jun 2003 17:26:26 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Lim",
"Woei Chet",
"",
"University of Waterloo"
],
[
"van Elst",
"Henk",
"",
"Queen Mary,\n University of London"
],
[
"Uggla",
"Claes",
"",
"University of Karlstad"
],
[
"Wainwright",
"John",
"",
"University of Waterloo"
]
] | In this paper we investigate asymptotic isotropization. We derive the asymptotic dynamics of spatially inhomogeneous cosmological models with a perfect fluid matter source and a positive cosmological constant near the de Sitter equilibrium state at late times, and near the flat FL equilibrium state at early times. Our ... |
gr-qc/9412064 | Thibault Damour | T. Damour | Was Einstein 100% right ? | 16 pages, PLAIN TEX | null | null | IHES/P/94/61 | gr-qc | null | The confrontation between General Relativity and experimental results,
notably binary pulsar data, is summarized and its significance discussed. The
agreement between experiment and theory is numerically very impressive.
However, some recent theoretical findings (existence of non-perturbative
strong-field effects, na... | [
{
"created": "Wed, 21 Dec 1994 10:03:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Damour",
"T.",
""
]
] | The confrontation between General Relativity and experimental results, notably binary pulsar data, is summarized and its significance discussed. The agreement between experiment and theory is numerically very impressive. However, some recent theoretical findings (existence of non-perturbative strong-field effects, natu... |
gr-qc/0401049 | Tiberiu Harko | T. Harko and M. K. Mak | Vacuum solutions of the gravitational field equations in the brane world
model | 13 pages, no figures, to appear in PRD | Phys.Rev. D69 (2004) 064020 | 10.1103/PhysRevD.69.064020 | null | gr-qc hep-th | null | We consider some classes of solutions of the static, spherically symmetric
gravitational field equations in the vacuum in the brane world scenario, in
which our Universe is a three-brane embedded in a higher dimensional
space-time. The vacuum field equations on the brane are reduced to a system of
two ordinary differ... | [
{
"created": "Tue, 13 Jan 2004 02:46:35 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Harko",
"T.",
""
],
[
"Mak",
"M. K.",
""
]
] | We consider some classes of solutions of the static, spherically symmetric gravitational field equations in the vacuum in the brane world scenario, in which our Universe is a three-brane embedded in a higher dimensional space-time. The vacuum field equations on the brane are reduced to a system of two ordinary differen... |
gr-qc/9611031 | Tomohiro Harada | Tomohiro Harada, Takeshi Chiba, Ken-ichi Nakao and Takashi Nakamura | Scalar gravitational wave from Oppenheimer-Snyder collapse in scalar-
tensor theories of gravity | Revised version, 27 pages, including 16 eps figures. Accepted for
publication in Physical Review D | Phys.Rev.D55:2024-2037,1997 | 10.1103/PhysRevD.55.2024 | KUNS-1405, YITP/96-31 | gr-qc astro-ph | null | Unlike general relativity, scalar-tensor theories of gravity predict scalar
gravitational waves even from a spherically symmetric gravitational collapse.
We solve numerically the generation and propagation of the scalar gravitational
wave from a spherically symmetric and homogeneous dust collapse under the
approximat... | [
{
"created": "Tue, 12 Nov 1996 13:57:26 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Feb 1997 10:42:53 GMT",
"version": "v2"
}
] | 2011-09-09 | [
[
"Harada",
"Tomohiro",
""
],
[
"Chiba",
"Takeshi",
""
],
[
"Nakao",
"Ken-ichi",
""
],
[
"Nakamura",
"Takashi",
""
]
] | Unlike general relativity, scalar-tensor theories of gravity predict scalar gravitational waves even from a spherically symmetric gravitational collapse. We solve numerically the generation and propagation of the scalar gravitational wave from a spherically symmetric and homogeneous dust collapse under the approximatio... |
2106.01197 | Praveen Negi | P S Negi | Massive Neutron Star Models with Parabolic Cores | 12 pages, 5 figures | Astrophysics and Space Science 365, 32 (2020) | 10.1007/s10509-020-3745-3 | null | gr-qc astro-ph.HE | http://creativecommons.org/publicdomain/zero/1.0/ | The results of the investigation of the core-envelope model presented in Negi
et al. \cite{Ref1} have been discussed in view of the reference \cite{Ref2} .
It is seen that there are significant changes in the results to be addressed.
In addition, I have also calculated the gravitational binding energy, causality
and ... | [
{
"created": "Wed, 2 Jun 2021 14:41:08 GMT",
"version": "v1"
}
] | 2021-06-04 | [
[
"Negi",
"P S",
""
]
] | The results of the investigation of the core-envelope model presented in Negi et al. \cite{Ref1} have been discussed in view of the reference \cite{Ref2} . It is seen that there are significant changes in the results to be addressed. In addition, I have also calculated the gravitational binding energy, causality and pu... |
gr-qc/0611137 | Molin Liu | Molin Liu, Hongya Liu, Lixin Xu, Paul S. Wesson | Radiation and Potential Barriers of a 5D Black String Solution | 9 pages, 3 figures, accepted for publication on MPLA | Mod.Phys.Lett.A21:2937-2946,2006 | 10.1142/S0217732306022341 | null | gr-qc astro-ph hep-th | null | By using a massless scalar field we examine the effect of an extra dimension
on black hole radiation. Because the equations are coupled, we find that the
structure of the fifth dimension (as for membrane and induced-matter theory)
affects the nature of the radiation observed in four-dimensional spacetime. In
the case... | [
{
"created": "Mon, 27 Nov 2006 00:38:21 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Liu",
"Molin",
""
],
[
"Liu",
"Hongya",
""
],
[
"Xu",
"Lixin",
""
],
[
"Wesson",
"Paul S.",
""
]
] | By using a massless scalar field we examine the effect of an extra dimension on black hole radiation. Because the equations are coupled, we find that the structure of the fifth dimension (as for membrane and induced-matter theory) affects the nature of the radiation observed in four-dimensional spacetime. In the case o... |
gr-qc/9511008 | null | G. Giachetta and G.Sardanashvily | Stress-Energy-Momentum of Affine-Metric Gravity. Generalized Komar
Superportential | 12 pp, LaTeX file | Class.Quant.Grav.13:L67-L72,1996 | 10.1088/0264-9381/13/6/001 | MPH/CAM/104/95 | gr-qc hep-th | null | In case of the Einstein's gravitation theory and its first order Palatini
reformulation, the stress-energy-momentum of gravity has been proved to reduce
to the Komar superpotential. We generalize this result to the affine-metric
theory of gravity in case of general connections and arbitrary Lagrangian
densities invar... | [
{
"created": "Thu, 2 Nov 1995 16:55:21 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Giachetta",
"G.",
""
],
[
"Sardanashvily",
"G.",
""
]
] | In case of the Einstein's gravitation theory and its first order Palatini reformulation, the stress-energy-momentum of gravity has been proved to reduce to the Komar superpotential. We generalize this result to the affine-metric theory of gravity in case of general connections and arbitrary Lagrangian densities invaria... |
gr-qc/0108023 | Alfredo Sandoval-Villalbazo | Ana Laura Garcia-Perciante, Alfredo Sandoval-Villalbazo and L.S.
Garcia-Colin | Kaluza's theory in generalized coordinates | 11 pages, RevTex. Accepted for publication in the Journal of
Matematical Physics | J.Math.Phys. 42 (2001) 5785-5799 | 10.1063/1.1412463 | null | gr-qc | null | Maxwell's equations can be obtained in generalized coordinates by considering
the electromagnetic field as an external agent. The work here presented shows
how to obtain the electrodynamics for a charged particle in generalized
coordinates eliminating the concept of external force. Based on Kaluza's
formalism, the on... | [
{
"created": "Wed, 8 Aug 2001 11:29:21 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Garcia-Perciante",
"Ana Laura",
""
],
[
"Sandoval-Villalbazo",
"Alfredo",
""
],
[
"Garcia-Colin",
"L. S.",
""
]
] | Maxwell's equations can be obtained in generalized coordinates by considering the electromagnetic field as an external agent. The work here presented shows how to obtain the electrodynamics for a charged particle in generalized coordinates eliminating the concept of external force. Based on Kaluza's formalism, the one ... |
1503.03559 | Yun Soo Myung | Yun Soo Myung | Stability of black holes in f(R) gravity | 1+13 pages, 2 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the stability of black holes in the viable model of
$f(R)=R+R^2$ gravity which was known to be the best fit for inflation. These
include Schwarzschild and Kerr black holes. Instead of studying the
fourth-order linearized equation around the black hole background, we use the
corresponding tensor-scalar ... | [
{
"created": "Thu, 12 Mar 2015 02:04:45 GMT",
"version": "v1"
}
] | 2015-03-13 | [
[
"Myung",
"Yun Soo",
""
]
] | We investigate the stability of black holes in the viable model of $f(R)=R+R^2$ gravity which was known to be the best fit for inflation. These include Schwarzschild and Kerr black holes. Instead of studying the fourth-order linearized equation around the black hole background, we use the corresponding tensor-scalar th... |
1810.05844 | Orlando Luongo | Salvatore Capozziello, Rocco D'Agostino, Roberto Giamb\`o, Orlando
Luongo | Effective field description of the Anton-Schmidt cosmic fluid | 13 pages, Accepted for publication in Phys. Rev. D | Phys. Rev. D 99, 023532 (2019) | 10.1103/PhysRevD.99.023532 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effective theory of the Anton-Schmidt cosmic fluid within the Debye
approximation is investigated. In this picture, the universe is modeled out by
means of a medium without cosmological constant. In particular, the
Anton-Schmidt representation of matter describes the pressure of crystalline
solids under deformati... | [
{
"created": "Sat, 13 Oct 2018 11:17:27 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jan 2019 17:52:33 GMT",
"version": "v2"
}
] | 2019-02-06 | [
[
"Capozziello",
"Salvatore",
""
],
[
"D'Agostino",
"Rocco",
""
],
[
"Giambò",
"Roberto",
""
],
[
"Luongo",
"Orlando",
""
]
] | The effective theory of the Anton-Schmidt cosmic fluid within the Debye approximation is investigated. In this picture, the universe is modeled out by means of a medium without cosmological constant. In particular, the Anton-Schmidt representation of matter describes the pressure of crystalline solids under deformation... |
1111.2596 | Luisa T. Buchman | James M. Bardeen and Luisa T. Buchman | Bondi-Sachs Energy-Momentum for the CMC Initial Value Problem | version to be published in Phys. Rev. D | null | 10.1103/PhysRevD.85.064035 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The constraints on the asymptotic behavior of the conformal factor and
conformal extrinsic curvature imposed by the initial value equations of general
relativity on constant mean extrinsic curvature (CMC) hypersurfaces are
analyzed in detail. We derive explicit formulas for the Bondi-Sachs energy and
momentum in term... | [
{
"created": "Thu, 10 Nov 2011 20:54:34 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Mar 2012 06:53:35 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Bardeen",
"James M.",
""
],
[
"Buchman",
"Luisa T.",
""
]
] | The constraints on the asymptotic behavior of the conformal factor and conformal extrinsic curvature imposed by the initial value equations of general relativity on constant mean extrinsic curvature (CMC) hypersurfaces are analyzed in detail. We derive explicit formulas for the Bondi-Sachs energy and momentum in terms ... |
1710.11096 | Samuel E. Gralla | Samuel E. Gralla | On the Ambiguity in Relativistic Tidal Deformability | discussion expanded; matches published version | null | 10.1088/1361-6382/aab186 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The LIGO collaboration recently reported the first gravitational-wave
constraints on the tidal deformability of neutron stars. I discuss an inherent
ambiguity in the notion of relativistic tidal deformability that, while too
small to affect the present measurement, may become important in the future. I
propose a new ... | [
{
"created": "Mon, 30 Oct 2017 17:42:34 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Nov 2017 17:47:00 GMT",
"version": "v2"
},
{
"created": "Tue, 6 Mar 2018 22:04:22 GMT",
"version": "v3"
}
] | 2018-03-28 | [
[
"Gralla",
"Samuel E.",
""
]
] | The LIGO collaboration recently reported the first gravitational-wave constraints on the tidal deformability of neutron stars. I discuss an inherent ambiguity in the notion of relativistic tidal deformability that, while too small to affect the present measurement, may become important in the future. I propose a new wa... |
1406.1581 | Ioannis Gkigkitzis Dr. | Ioannis Gkigkitzis, Ioannis Haranas, Omiros Ragos | Kretschmann Invariant and Relations Between Spacetime Singularities,
Entropy and Information | 15 pages. arXiv admin note: text overlap with arXiv:1302.0479,
arXiv:cond-mat/9707012 by other authors. There was an error with the
information for one of the authors of the originally published paper in the
scientific journal. I resubmit the paper with all authors and correct
information | Physics International 5 (1), 2014, 103-111 | 10.3844/pisp.2014.103.111 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a yukawa type of metric we derive the kretschmann scalar for a general
static black hole of a certain mass. The scalar gives the curvature of the
space time as a function of the radial distance in the vicinity as well as
inside of the black hole. Furthermore, the kretschmann scalar helps us
understand the appea... | [
{
"created": "Fri, 6 Jun 2014 04:41:48 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jun 2014 17:11:24 GMT",
"version": "v2"
}
] | 2014-06-10 | [
[
"Gkigkitzis",
"Ioannis",
""
],
[
"Haranas",
"Ioannis",
""
],
[
"Ragos",
"Omiros",
""
]
] | Using a yukawa type of metric we derive the kretschmann scalar for a general static black hole of a certain mass. The scalar gives the curvature of the space time as a function of the radial distance in the vicinity as well as inside of the black hole. Furthermore, the kretschmann scalar helps us understand the appeara... |
2012.03046 | Jinxin Xue | Jinxin Xue | KAM and geodesic dynamics of blackholes | null | null | null | null | gr-qc math.DS | http://creativecommons.org/licenses/by/4.0/ | In this paper we apply KAM theory and the Aubry-Mather theory for twist maps
to the study of bound geodesic dynamics of a perturbed blackhole background.
The general theories apply mainly to two observable phenomena: the photon shell
(unstable bound spherical orbits) and the quasi-periodic oscillations. We
discover t... | [
{
"created": "Sat, 5 Dec 2020 15:10:00 GMT",
"version": "v1"
}
] | 2020-12-08 | [
[
"Xue",
"Jinxin",
""
]
] | In this paper we apply KAM theory and the Aubry-Mather theory for twist maps to the study of bound geodesic dynamics of a perturbed blackhole background. The general theories apply mainly to two observable phenomena: the photon shell (unstable bound spherical orbits) and the quasi-periodic oscillations. We discover the... |
1903.02035 | S. Danial Forghani | S. Danial Forghani, S. Habib Mazharimousavi, and Mustafa Halilsoy | Discontinuity Problem in the Linear Stability Analysis of Thin-Shell
Wormholes | 10 pages, 6 figures | Eur. Phys. J. Plus (2019) 134: 342 | 10.1140/epjp/i2019-12771-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the infinite discontinuity points of stability diagram in
thin-shell wormholes. The square of the speed of sound $\beta _{0}^{2}$,\ which
is expressed in terms of pressure and energy density at equilibrium on the
throat, arises with a divergent amplitude. As this is physically
non-acceptable, \ we revi... | [
{
"created": "Tue, 5 Mar 2019 20:11:45 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Apr 2019 16:53:03 GMT",
"version": "v2"
}
] | 2019-08-06 | [
[
"Forghani",
"S. Danial",
""
],
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"Mustafa",
""
]
] | We investigate the infinite discontinuity points of stability diagram in thin-shell wormholes. The square of the speed of sound $\beta _{0}^{2}$,\ which is expressed in terms of pressure and energy density at equilibrium on the throat, arises with a divergent amplitude. As this is physically non-acceptable, \ we revise... |
2111.04540 | Jinhua Wang | Chao Liu and Jinhua Wang | A new symmetric hyperbolic formulation and the local Cauchy problem for
the Einstein--Yang--Mills system in the temporal gauge | 27 pages, comments are all welcome | null | null | null | gr-qc math-ph math.AP math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the future stability problem of solutions of the
Einstein--Yang--Mills (EYM) system with arbitrary dimension, we aim to (1)
construct a tensorial symmetric hyperbolic formulation for the
$(n+1)$-dimensional EYM system in the temporal gauge; (2) establish the local
well-posedness for the Cauchy problem of... | [
{
"created": "Mon, 8 Nov 2021 14:38:04 GMT",
"version": "v1"
},
{
"created": "Sat, 13 Nov 2021 15:24:53 GMT",
"version": "v2"
}
] | 2021-11-16 | [
[
"Liu",
"Chao",
""
],
[
"Wang",
"Jinhua",
""
]
] | Motivated by the future stability problem of solutions of the Einstein--Yang--Mills (EYM) system with arbitrary dimension, we aim to (1) construct a tensorial symmetric hyperbolic formulation for the $(n+1)$-dimensional EYM system in the temporal gauge; (2) establish the local well-posedness for the Cauchy problem of E... |
1406.4282 | Giuseppe d'Ambrosi | G. d'Ambrosi, J.W. van Holten | Ballistic orbits in Schwarzschild space-time and gravitational waves
from EMR binary mergers | 20 pages, 9 figures Revised version: added clarifying remarks to
introduction and summary; additional table; results and conclusions
unchanged. Accepted version for Class. Quant. Grav | Class.Quant.Grav. 32 (2015) 1, 015012 | 10.1088/0264-9381/32/1/015012 | NIKHEF/2014-020 | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a special class of ballistic geodesics in Schwarzschild
space-time, extending to the horizon in the infinite past and future of
observer time, which are characterized by the property that they are in 1-1
correspondence, and completely degenerate in energy and angular momentum, with
stable circular orbits.... | [
{
"created": "Tue, 17 Jun 2014 08:54:14 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Jul 2014 12:36:29 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Oct 2014 12:27:14 GMT",
"version": "v3"
}
] | 2015-03-06 | [
[
"d'Ambrosi",
"G.",
""
],
[
"van Holten",
"J. W.",
""
]
] | We describe a special class of ballistic geodesics in Schwarzschild space-time, extending to the horizon in the infinite past and future of observer time, which are characterized by the property that they are in 1-1 correspondence, and completely degenerate in energy and angular momentum, with stable circular orbits. W... |
1212.2025 | Mark Israelit | Mark Israelit | Dark Energy in a perturbed Weyl-Dirac Universe | 14 pages, In this new versiochanges are made. 1. The term
"perturbed/perturbation" is deleted. 2. in Sec-s 5 and6 some formula are
corrected, added. 3. At the end of Sec. 6. a discussion is added. 4. One
reference is added. arXiv admin note: text overlap with arXiv:1212.2208 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of Weyl-Dirac's theory a perturbed universe is considered.
It contains luminous matter, dark matter consisting of weylons as well dark
energy (DE) presented by Dirac's gauge function,\beta. A massive body creates a
spherically symmetric gravitational field, that is regarded as the perturbation
of the... | [
{
"created": "Mon, 10 Dec 2012 10:36:27 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Aug 2013 12:35:55 GMT",
"version": "v2"
}
] | 2013-08-06 | [
[
"Israelit",
"Mark",
""
]
] | In the framework of Weyl-Dirac's theory a perturbed universe is considered. It contains luminous matter, dark matter consisting of weylons as well dark energy (DE) presented by Dirac's gauge function,\beta. A massive body creates a spherically symmetric gravitational field, that is regarded as the perturbation of the h... |
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