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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1503.05943 | Seramika Ariwahjoedi | Seramika Ariwahjoedi, Jusak Sali Kosasih, Carlo Rovelli, Freddy P. Zen | Curvatures and discrete Gauss-Codazzi equation in (2+1)-dimensional loop
quantum gravity | 16 pages, 10 figures | IJGMMP 12: 1550112. (2015) | 10.1142/S0219887815501121 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the Gauss-Codazzi equation in the holonomy and plane-angle
representations and we use the result to write a Gauss-Codazzi equation for a
discrete (2+1)-dimensional manifold, triangulated by isosceles tetrahedra. This
allows us to write operators acting on spin network states in (2+1)-dimensional
loop quantu... | [
{
"created": "Thu, 19 Mar 2015 20:56:48 GMT",
"version": "v1"
}
] | 2016-08-01 | [
[
"Ariwahjoedi",
"Seramika",
""
],
[
"Kosasih",
"Jusak Sali",
""
],
[
"Rovelli",
"Carlo",
""
],
[
"Zen",
"Freddy P.",
""
]
] | We derive the Gauss-Codazzi equation in the holonomy and plane-angle representations and we use the result to write a Gauss-Codazzi equation for a discrete (2+1)-dimensional manifold, triangulated by isosceles tetrahedra. This allows us to write operators acting on spin network states in (2+1)-dimensional loop quantum ... |
1203.0748 | Leszek Soko{\l}owski | Leszek M. Sokolowski | On the twin paradox in static spacetimes: I. Schwarzschild metric | 18 pages, paper accepted for publication in Gen. Rel. Grav | Gen. Relativ. Gravit. (2012) 44:1267-1283 | 10.1007/s10714-012-1337-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by a conjecture put forward by Abramowicz and Bajtlik we reconsider
the twin paradox in static spacetimes. According to a well known theorem in
Lorentzian geometry the longest timelike worldline between two given points is
the unique geodesic line without points conjugate to the initial point on the
segment... | [
{
"created": "Sun, 4 Mar 2012 16:35:39 GMT",
"version": "v1"
}
] | 2012-04-11 | [
[
"Sokolowski",
"Leszek M.",
""
]
] | Motivated by a conjecture put forward by Abramowicz and Bajtlik we reconsider the twin paradox in static spacetimes. According to a well known theorem in Lorentzian geometry the longest timelike worldline between two given points is the unique geodesic line without points conjugate to the initial point on the segment j... |
1504.07624 | Massimo Giovannini | Massimo Giovannini | Comment on "Accelerating cosmological expansion from shear and bulk
viscosity" | null | null | null | CERN-PH-TH-2015-101 | gr-qc astro-ph.GA hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent Letter [Phys. Rev. Lett. 114 091301 (2105)] the cause of the
acceleration of the present Universe has been identified with the shear
viscosity of an imperfect relativistic fluid even in the absence of any bulk
viscous contribution. The gist of this comment is that the shear viscosity, if
anything, can onl... | [
{
"created": "Tue, 28 Apr 2015 16:22:09 GMT",
"version": "v1"
}
] | 2015-05-04 | [
[
"Giovannini",
"Massimo",
""
]
] | In a recent Letter [Phys. Rev. Lett. 114 091301 (2105)] the cause of the acceleration of the present Universe has been identified with the shear viscosity of an imperfect relativistic fluid even in the absence of any bulk viscous contribution. The gist of this comment is that the shear viscosity, if anything, can only ... |
2102.01703 | Alexandre Pombo | Carlos A. R. Herdeiro, Alexandre M. Pombo, Eugen Radu, Pedro V. P.
Cunha and Nicolas Sanchis-Gual | The imitation game: Proca stars that can mimic the Schwarzschild shadow | Abstract abridged due to arXiv length limit; 22 pages, 9 figures | null | 10.1088/1475-7516/2021/04/051 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Can a dynamically robust bosonic star (BS) produce an (effective) shadow that
mimics that of a black hole (BH)? The BH shadow is linked to the existence of
light rings (LRs). For free bosonic fields, yielding mini-BSs, it is known that
these stars can become ultra-compact - i.e., possess LRs - but only for
perturbati... | [
{
"created": "Tue, 2 Feb 2021 19:00:01 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Apr 2021 16:23:57 GMT",
"version": "v2"
}
] | 2021-04-20 | [
[
"Herdeiro",
"Carlos A. R.",
""
],
[
"Pombo",
"Alexandre M.",
""
],
[
"Radu",
"Eugen",
""
],
[
"Cunha",
"Pedro V. P.",
""
],
[
"Sanchis-Gual",
"Nicolas",
""
]
] | Can a dynamically robust bosonic star (BS) produce an (effective) shadow that mimics that of a black hole (BH)? The BH shadow is linked to the existence of light rings (LRs). For free bosonic fields, yielding mini-BSs, it is known that these stars can become ultra-compact - i.e., possess LRs - but only for perturbative... |
gr-qc/9912101 | Konoplya | R.A. Konoplya | Small Perturbations in General Relativity: Tensor Harmonics of Arbitrary
Symmetry | 9 pages, LaTeX 2e with AMS fonts, minor changes, some misprints
corrected | Phys.Lett. A268 (2000) 37-44 | 10.1016/S0375-9601(00)00160-2 | null | gr-qc | null | We develop a method for constructing of the basic functions with witch to
expand small perturbations of space-time in General Relativity. The method
allows to obtain the tensor harmonics for perturbations of the background
space-time admitting an arbitrary group of isometry, and to split the
linearized Einstein equat... | [
{
"created": "Thu, 23 Dec 1999 17:46:49 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jan 2000 16:24:33 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Oct 2003 11:47:02 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Konoplya",
"R. A.",
""
]
] | We develop a method for constructing of the basic functions with witch to expand small perturbations of space-time in General Relativity. The method allows to obtain the tensor harmonics for perturbations of the background space-time admitting an arbitrary group of isometry, and to split the linearized Einstein equatio... |
1008.4839 | Md. Rahman Atiqur | M. Atiqur Rahman | Quantum Nonthermal Radiation of Kerr-anti-de Sitter Black Holes | 13 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the properties of Quantum nonthermal radiation of a Kerr-anti-de
Sitter (KAdS) black holes. Assuming that a crossing of the positive and
negative Dirac energy levels occurs in a region near the event horizon of the
hole, and spontaneous quantum nonthermal radiation takes place in the overlap
region. We sol... | [
{
"created": "Sat, 28 Aug 2010 06:59:45 GMT",
"version": "v1"
}
] | 2010-08-31 | [
[
"Rahman",
"M. Atiqur",
""
]
] | We examine the properties of Quantum nonthermal radiation of a Kerr-anti-de Sitter (KAdS) black holes. Assuming that a crossing of the positive and negative Dirac energy levels occurs in a region near the event horizon of the hole, and spontaneous quantum nonthermal radiation takes place in the overlap region. We solve... |
1810.03936 | Anuradha Samajdar | Anuradha Samajdar and Tim Dietrich | Waveform systematics for binary neutron star gravitational wave signals:
effects of the point-particle baseline and tidal descriptions | 12 pages, 6 figures, 3 tables | Phys. Rev. D 98, 124030 (2018) | 10.1103/PhysRevD.98.124030 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave (GW) astronomy has consolidated its role as a new
observational window to reveal the properties of compact binaries in the
Universe. In particular, the discovery of the first binary neutron star
coalescence, GW170817, led to a number of scientific breakthroughs as the
possibility to place constrain... | [
{
"created": "Tue, 9 Oct 2018 12:26:05 GMT",
"version": "v1"
}
] | 2018-12-26 | [
[
"Samajdar",
"Anuradha",
""
],
[
"Dietrich",
"Tim",
""
]
] | Gravitational wave (GW) astronomy has consolidated its role as a new observational window to reveal the properties of compact binaries in the Universe. In particular, the discovery of the first binary neutron star coalescence, GW170817, led to a number of scientific breakthroughs as the possibility to place constraints... |
gr-qc/0512104 | Orhan Donmez | Orhan Donmez | Solution of the 1D Special Relativistic Hydrodynamics(SRH) Equations
Using Different Numerical Method and Results from Different Test Problems | 8 figures | Appl.Math.Comput. 181 (2006) 256-270 | 10.1016/j.amc.2006.01.031 | null | gr-qc physics.comp-ph | null | In this paper, we have solved 1D special relativistic hydrodynamical
equations using different numerical method in computational gas dynamics. The
numerical solutions of these equations for smooth wave cases give better
solution when we use $Non-TVD$(Total Variable Diminishing) but solution of
discontinuity wave prod... | [
{
"created": "Mon, 19 Dec 2005 18:16:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Donmez",
"Orhan",
""
]
] | In this paper, we have solved 1D special relativistic hydrodynamical equations using different numerical method in computational gas dynamics. The numerical solutions of these equations for smooth wave cases give better solution when we use $Non-TVD$(Total Variable Diminishing) but solution of discontinuity wave produc... |
gr-qc/9907004 | Jorma Louko | Jorma Louko, Carlo Rovelli | Refined Algebraic Quantization in the oscillator representation of
SL(2,R) | 30 pages, REVTeX v3.1 with amsfonts. (v4: Published version.) | J.Math.Phys. 41 (2000) 132-155 | 10.1063/1.533126 | AEI 1999-010 | gr-qc hep-th math.QA | null | We investigate Refined Algebraic Quantization (RAQ) with group averaging in a
constrained Hamiltonian system with unreduced phase space T^*R^4 and gauge
group SL(2,R). The reduced phase space M is connected and contains four
mutually disconnected `regular' sectors with topology R x S^1, but these
sectors are connecte... | [
{
"created": "Fri, 2 Jul 1999 10:04:45 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Jul 1999 19:39:30 GMT",
"version": "v2"
},
{
"created": "Mon, 13 Sep 1999 10:38:27 GMT",
"version": "v3"
},
{
"created": "Sun, 16 Jan 2000 15:14:16 GMT",
"version": "v4"
}
] | 2009-10-31 | [
[
"Louko",
"Jorma",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We investigate Refined Algebraic Quantization (RAQ) with group averaging in a constrained Hamiltonian system with unreduced phase space T^*R^4 and gauge group SL(2,R). The reduced phase space M is connected and contains four mutually disconnected `regular' sectors with topology R x S^1, but these sectors are connected ... |
2311.01300 | Niels Warburton | LISA Consortium Waveform Working Group: Niayesh Afshordi, Sarp
Ak\c{c}ay, Pau Amaro Seoane, Andrea Antonelli, Josu C. Aurrekoetxea, Leor
Barack, Enrico Barausse, Robert Benkel, Laura Bernard, Sebastiano Bernuzzi,
Emanuele Berti, Matteo Bonetti, B\'eatrice Bonga, Gabriele Bozzola, Richard
Brito, Alessandra Buona... | Waveform Modelling for the Laser Interferometer Space Antenna | 239 pages, 11 figures, white paper from the LISA Consortium Waveform
Working Group, invited for submission to Living Reviews in Relativity,
updated with comments from community | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | LISA, the Laser Interferometer Space Antenna, will usher in a new era in
gravitational-wave astronomy. As the first anticipated space-based
gravitational-wave detector, it will expand our view to the millihertz
gravitational-wave sky, where a spectacular variety of interesting new sources
abound: from millions of ult... | [
{
"created": "Thu, 2 Nov 2023 15:15:33 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Dec 2023 15:13:41 GMT",
"version": "v2"
}
] | 2023-12-21 | [
[
"LISA Consortium Waveform Working Group",
"",
""
],
[
"Afshordi",
"Niayesh",
""
],
[
"Akçay",
"Sarp",
""
],
[
"Seoane",
"Pau Amaro",
""
],
[
"Antonelli",
"Andrea",
""
],
[
"Aurrekoetxea",
"Josu C.",
""
],
[
"Barack... | LISA, the Laser Interferometer Space Antenna, will usher in a new era in gravitational-wave astronomy. As the first anticipated space-based gravitational-wave detector, it will expand our view to the millihertz gravitational-wave sky, where a spectacular variety of interesting new sources abound: from millions of ultra... |
1805.02854 | Abdulla Al Mamon | Abdulla Al Mamon, Kazuharu Bamba | Observational constraints on the jerk parameter with the data of the
Hubble parameter | 9 pages, 4 figures, 1 table, new references added, version accepted
for publication in the European Physical Journal C | null | null | FU-PCG-32 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the accelerated expansion phase of the universe by using the
{\textit{kinematic approach}}. In particular, the deceleration parameter $q$ is
parametrized in a model-independent way. Considering a generalized
parametrization for $q$, we first obtain the jerk parameter $j$ (a
dimensionless third time derivativ... | [
{
"created": "Tue, 8 May 2018 06:31:36 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Oct 2018 17:48:27 GMT",
"version": "v2"
}
] | 2018-10-22 | [
[
"Mamon",
"Abdulla Al",
""
],
[
"Bamba",
"Kazuharu",
""
]
] | We study the accelerated expansion phase of the universe by using the {\textit{kinematic approach}}. In particular, the deceleration parameter $q$ is parametrized in a model-independent way. Considering a generalized parametrization for $q$, we first obtain the jerk parameter $j$ (a dimensionless third time derivative ... |
1312.5808 | Alberto Diez-Tejedor | Juan Barranco, Argelia Bernal, Juan Carlos Degollado, Alberto
Diez-Tejedor, Miguel Megevand, Miguel Alcubierre, Dario Nunez and Olivier
Sarbach | Schwarzschild scalar wigs: spectral analysis and late time behavior | 20 pages, 13 figures, 2 tables. Accepted for publication in Phys.
Rev. D | Phys. Rev. D 89, 083006 (2014) | 10.1103/PhysRevD.89.083006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Green's function representation technique, the late time behavior
of localized scalar field distributions on Schwarzschild spacetimes is studied.
Assuming arbitrary initial data we perform a spectral analysis, computing the
amplitude of each excited quasi-bound mode without the necessity of performing
dynam... | [
{
"created": "Fri, 20 Dec 2013 04:02:23 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Apr 2014 19:14:44 GMT",
"version": "v2"
}
] | 2014-04-23 | [
[
"Barranco",
"Juan",
""
],
[
"Bernal",
"Argelia",
""
],
[
"Degollado",
"Juan Carlos",
""
],
[
"Diez-Tejedor",
"Alberto",
""
],
[
"Megevand",
"Miguel",
""
],
[
"Alcubierre",
"Miguel",
""
],
[
"Nunez",
"Dario",
... | Using the Green's function representation technique, the late time behavior of localized scalar field distributions on Schwarzschild spacetimes is studied. Assuming arbitrary initial data we perform a spectral analysis, computing the amplitude of each excited quasi-bound mode without the necessity of performing dynamic... |
0812.2825 | Merced Montesinos | Merced Montesinos, Mercedes Velazquez | Husain-Kuchar model as a constrained BF theory | new version, 5 pages, no figures, LaTeX file | null | 10.1063/1.3284385 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Husain-Kuchar theory is a four-dimensional background-independent model
that has long been viewed as a useful model for addressing several conceptual
and technical problems appearing in the quantization of general relativity
mainly in the loop quantum gravity approach. The model was defined at
Lagrangian level in... | [
{
"created": "Mon, 15 Dec 2008 14:57:40 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Apr 2009 19:12:04 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Montesinos",
"Merced",
""
],
[
"Velazquez",
"Mercedes",
""
]
] | The Husain-Kuchar theory is a four-dimensional background-independent model that has long been viewed as a useful model for addressing several conceptual and technical problems appearing in the quantization of general relativity mainly in the loop quantum gravity approach. The model was defined at Lagrangian level in t... |
2401.14048 | Ethan James German Mr. | Ethan James German and Joseph Sultana | Turnaround Radius for charged particles in the Reissner-Nordstr\"{o}m
deSitter spacetime | 22 pages, 7 figures | null | 10.1007/s10714-024-03248-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the turnaround radius of the Reissner-Nordstr\"{o}m deSitter
Spacetime and how the turnaround radius changes if a test particle carries
charge. We also consider the Mart\'{i}nez-Troncoso-Zanelli (MTZ) solution of
conformally coupled gravity and investigate how the turnaround radius changes
for a scalar... | [
{
"created": "Thu, 25 Jan 2024 10:06:48 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jan 2024 11:26:11 GMT",
"version": "v2"
}
] | 2024-05-22 | [
[
"German",
"Ethan James",
""
],
[
"Sultana",
"Joseph",
""
]
] | We investigate the turnaround radius of the Reissner-Nordstr\"{o}m deSitter Spacetime and how the turnaround radius changes if a test particle carries charge. We also consider the Mart\'{i}nez-Troncoso-Zanelli (MTZ) solution of conformally coupled gravity and investigate how the turnaround radius changes for a scalar t... |
0711.2840 | Vladimir Dzhunushaliev | Vladimir Dzhunushaliev and Vladimir Folomeev | 4D static solutions with interacting phantom fields | final version | Int.J.Mod.Phys.D17:2125-2142,2008 | 10.1142/S0218271808013753 | null | gr-qc | null | Three static models with two interacting phantom and ghost scalar fields were
considered: a model of a traversable wormhole, a brane-like model and a
spherically symmetric problem. It was shown numerically that regular solutions
exist for all three cases.
| [
{
"created": "Mon, 19 Nov 2007 04:31:30 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Feb 2008 06:02:58 GMT",
"version": "v2"
}
] | 2009-02-11 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Folomeev",
"Vladimir",
""
]
] | Three static models with two interacting phantom and ghost scalar fields were considered: a model of a traversable wormhole, a brane-like model and a spherically symmetric problem. It was shown numerically that regular solutions exist for all three cases. |
1604.08706 | Yun Soo Myung | Yun Soo Myung | Comment on Quantum Massive Conformal Gravity | 4 pages, no figures | null | 10.1140/epjc/s10052-016-4165-y | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | In a recent paper in EPJC March 2016, Faria has shown that quantum massive
conformal gravity is renormalizable but has ghost states. We comment this paper
on the aspect of renormalizability.
| [
{
"created": "Fri, 29 Apr 2016 07:02:09 GMT",
"version": "v1"
}
] | 2016-07-20 | [
[
"Myung",
"Yun Soo",
""
]
] | In a recent paper in EPJC March 2016, Faria has shown that quantum massive conformal gravity is renormalizable but has ghost states. We comment this paper on the aspect of renormalizability. |
2104.00521 | Enrique Gaztanaga | Enrique Gaztanaga and Pablo Fosalba | A peek outside our Universe | 3 pages. Essay written for the Gravity Research Foundation 2021
Awards for Essays on Gravitation | Symmetry 2022, 14, 285 | 10.3390/sym14020285 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to general relativity (GR), a universe with a cosmological constant
$\Lambda$, like ours, is trapped inside an event horizon, $r<
\sqrt{3/\Lambda}$. What is outside? We show, using Israel (1967) junction
conditions, that there could be a different universe outside. Our universe
looks like a black hole for a... | [
{
"created": "Wed, 31 Mar 2021 10:54:01 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Feb 2022 18:42:39 GMT",
"version": "v2"
}
] | 2022-02-03 | [
[
"Gaztanaga",
"Enrique",
""
],
[
"Fosalba",
"Pablo",
""
]
] | According to general relativity (GR), a universe with a cosmological constant $\Lambda$, like ours, is trapped inside an event horizon, $r< \sqrt{3/\Lambda}$. What is outside? We show, using Israel (1967) junction conditions, that there could be a different universe outside. Our universe looks like a black hole for an ... |
gr-qc/0307088 | Kayll Lake | Piotr T. Chru\'sciel and Kayll Lake | Cauchy horizons in Gowdy space times | 25 pages Latex. Further information at http://grtensor.org/gowdy/ | Class.Quant.Grav. 21 (2004) S153-S170 | 10.1088/0264-9381/21/3/010 | null | gr-qc | null | We analyse exhaustively the structure of \emph{non-degenerate} Cauchy
horizons in Gowdy space-times, and we establish existence of a large class of
non-polarized Gowdy space-times with such horizons.
Added in proof: Our results here, together with deep new results of H.
Ringstr\"om (talk at the Miami Waves conferen... | [
{
"created": "Fri, 18 Jul 2003 19:18:55 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jan 2004 20:21:58 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Lake",
"Kayll",
""
]
] | We analyse exhaustively the structure of \emph{non-degenerate} Cauchy horizons in Gowdy space-times, and we establish existence of a large class of non-polarized Gowdy space-times with such horizons. Added in proof: Our results here, together with deep new results of H. Ringstr\"om (talk at the Miami Waves conference, ... |
gr-qc/9809037 | Thomas P. Kling | Thomas P. Kling and Ezra T. Newman | Null Cones in Schwarzschild Geometry | 31 pages, 5 figures | Phys.Rev. D59 (1999) 124002 | 10.1103/PhysRevD.59.124002 | null | gr-qc | null | Light cones of Schwarzschild geometry are studied in connection to the Null
Surface Formulation and gravitational lensing. The paper studies the light cone
cut function's singularity structure, gives exact gravitational lensing
equations, and shows that the "pseudo-Minkowski" coordinates are well defined
within the m... | [
{
"created": "Wed, 9 Sep 1998 18:31:23 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kling",
"Thomas P.",
""
],
[
"Newman",
"Ezra T.",
""
]
] | Light cones of Schwarzschild geometry are studied in connection to the Null Surface Formulation and gravitational lensing. The paper studies the light cone cut function's singularity structure, gives exact gravitational lensing equations, and shows that the "pseudo-Minkowski" coordinates are well defined within the mod... |
gr-qc/0502073 | Ernesto F. Eiroa | Ernesto F. Eiroa, Claudio Simeone | Thin-shell wormholes in dilaton gravity | 7 pages, 1 figure; v2: shortened and improved. Accepted for
publication in Physical Review D | Phys.Rev. D71 (2005) 127501 | 10.1103/PhysRevD.71.127501 | null | gr-qc hep-th | null | In this work we construct charged thin-shell Lorentzian wormholes in dilaton
gravity. The exotic matter required for the construction is localized in the
shell and the energy conditions are satisfied outside the shell. The total
amount of exotic matter is calculated and its dependence with the parameters of
the model... | [
{
"created": "Tue, 15 Feb 2005 16:15:36 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jun 2005 17:33:34 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Eiroa",
"Ernesto F.",
""
],
[
"Simeone",
"Claudio",
""
]
] | In this work we construct charged thin-shell Lorentzian wormholes in dilaton gravity. The exotic matter required for the construction is localized in the shell and the energy conditions are satisfied outside the shell. The total amount of exotic matter is calculated and its dependence with the parameters of the model i... |
1710.05968 | Nandan Roy | Nandan Roy and Nivedita Bhadra | Dynamical systems analysis of phantom models | 11 pages, 24 figures | null | 10.1088/1475-7516/2018/06/002 | null | gr-qc math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the dynamical systems analysis of phantom dark energy
models considering a general potential. The stability analysis of the system
shows that there is only one fixed point which could be the beginning of the
universe but there could be many options for our future destiny. A detail
numerical ana... | [
{
"created": "Mon, 16 Oct 2017 19:38:47 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Mar 2018 03:18:30 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Mar 2018 03:03:15 GMT",
"version": "v3"
}
] | 2018-06-13 | [
[
"Roy",
"Nandan",
""
],
[
"Bhadra",
"Nivedita",
""
]
] | In this work, we study the dynamical systems analysis of phantom dark energy models considering a general potential. The stability analysis of the system shows that there is only one fixed point which could be the beginning of the universe but there could be many options for our future destiny. A detail numerical analy... |
2308.07862 | Kavya N S | V. Venkatesha, Chaitra Chooda Chalavadi, N. S. Kavya, P. K. Sahoo | Wormhole Geometry and Three-Dimensional Embedding in Extended Symmetric
Teleparallel Gravity | New Astronomy published version | New Astronomy, 105 (2024) 102090 | 10.1016/j.newast.2023.102090 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In the present manuscript, we study traversable wormhole solutions in the
background of extended symmetric teleparallel gravity with matter coupling.
With the anisotropic matter distribution we probe the wormhole geometry for two
different gravity models. Primarily, we consider the linear model $ f(Q,T) =Q +
2 \, \xi... | [
{
"created": "Tue, 25 Jul 2023 05:32:44 GMT",
"version": "v1"
}
] | 2023-08-16 | [
[
"Venkatesha",
"V.",
""
],
[
"Chalavadi",
"Chaitra Chooda",
""
],
[
"Kavya",
"N. S.",
""
],
[
"Sahoo",
"P. K.",
""
]
] | In the present manuscript, we study traversable wormhole solutions in the background of extended symmetric teleparallel gravity with matter coupling. With the anisotropic matter distribution we probe the wormhole geometry for two different gravity models. Primarily, we consider the linear model $ f(Q,T) =Q + 2 \, \xi \... |
gr-qc/0510126 | James B. Hartle | James B. Hartle | Generalizing Quantum Mechanics for Quantum Gravity | 8 pages, LATEX, a very brief abstract of much work | Int.J.Theor.Phys. 45 (2006) 1390-1396 | 10.1007/s10773-006-9134-z | null | gr-qc hep-th quant-ph | null | `How do our ideas about quantum mechanics affect our understanding of
spacetime?' This familiar question leads to quantum gravity. The complementary
question is also important: `How do our ideas about spacetime affect our
understanding of quantum mechanics?' This short abstract of a talk given at the
Gafka2004 confer... | [
{
"created": "Sun, 30 Oct 2005 18:38:58 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Hartle",
"James B.",
""
]
] | `How do our ideas about quantum mechanics affect our understanding of spacetime?' This familiar question leads to quantum gravity. The complementary question is also important: `How do our ideas about spacetime affect our understanding of quantum mechanics?' This short abstract of a talk given at the Gafka2004 conferen... |
2106.12513 | David Prinz | David Prinz and Alexander Schmeding | Lie Theory for Asymptotic Symmetries in General Relativity: The BMS
Group | 29 pages, article; minor revisions; version to appear in Classical
and Quantum Gravity | Class. Quantum Grav. 39 (2022) 065004 | 10.1088/1361-6382/ac4ae2 | null | gr-qc math-ph math.GR math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Lie group structure of asymptotic symmetry groups in General
Relativity from the viewpoint of infinite-dimensional geometry. To this end, we
review the geometric definition of asymptotic simplicity and emptiness due to
Penrose and the coordinate-wise definition of asymptotic flatness due to Bondi
et al. ... | [
{
"created": "Wed, 23 Jun 2021 16:30:00 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jan 2022 17:30:00 GMT",
"version": "v2"
}
] | 2022-03-01 | [
[
"Prinz",
"David",
""
],
[
"Schmeding",
"Alexander",
""
]
] | We study the Lie group structure of asymptotic symmetry groups in General Relativity from the viewpoint of infinite-dimensional geometry. To this end, we review the geometric definition of asymptotic simplicity and emptiness due to Penrose and the coordinate-wise definition of asymptotic flatness due to Bondi et al. Th... |
2309.10903 | Antonio Enea Romano | Antonio Enea Romano, Mairi Sakellariadou | Constraining the time evolution of the propagation speed of
gravitational waves with multimessenger astronomy | null | null | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Several modified gravity theories predict a possible time variation of the
propagation speed of gravitational waves (GW) which could be tested with
multimessenger astronomy. For this purpose we derive the relation between the
redshift dependence of the propagation speed of GWs and the time delay between
the detection... | [
{
"created": "Tue, 19 Sep 2023 19:57:10 GMT",
"version": "v1"
},
{
"created": "Wed, 6 Dec 2023 23:58:43 GMT",
"version": "v2"
}
] | 2023-12-08 | [
[
"Romano",
"Antonio Enea",
""
],
[
"Sakellariadou",
"Mairi",
""
]
] | Several modified gravity theories predict a possible time variation of the propagation speed of gravitational waves (GW) which could be tested with multimessenger astronomy. For this purpose we derive the relation between the redshift dependence of the propagation speed of GWs and the time delay between the detection o... |
1911.04487 | Emil M. Prodanov | Rossen I. Ivanov and Emil M. Prodanov | Integrable Cosmological Model with van der Waals Gas and Matter Creation | 25 pages, 21 figures, 1 table | Physical Review D 99, 063501 (2019) | 10.1103/PhysRevD.99.063501 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A cosmological model with van der Waals gas and dust has been studied in the
context of a three-component autonomous non-linear dynamical system involving
the time evolution of the particle number density, the Hubble parameter and the
temperature. Due to the presence of a symmetry of the model, the temperature
evolut... | [
{
"created": "Mon, 11 Nov 2019 16:06:10 GMT",
"version": "v1"
}
] | 2019-11-13 | [
[
"Ivanov",
"Rossen I.",
""
],
[
"Prodanov",
"Emil M.",
""
]
] | A cosmological model with van der Waals gas and dust has been studied in the context of a three-component autonomous non-linear dynamical system involving the time evolution of the particle number density, the Hubble parameter and the temperature. Due to the presence of a symmetry of the model, the temperature evolutio... |
gr-qc/9509014 | Rafael Vera Mege | Rafael A. Vera | Unified Relativistic Physics from a Standing Wave Particle Model | 17 pages, latex.To appear (5 pages) in Proc.of the 6th Canadian Conf.
on Gen. Rel and Rel. Astroph, with paralel work on the new astrophys. context | null | null | DFUDEC-95-RV9 | gr-qc astro-ph quant-ph | null | An extremely simple and unified base for physics comes out by starting all
over from a single postulate on the common nature of matter and stationary
forms of radiation quanta. Basic relativistic, gravitational (G) and quantum
mechanical properties of a standing wave particle model have been derived. This
has been do... | [
{
"created": "Thu, 7 Sep 1995 16:38:23 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vera",
"Rafael A.",
""
]
] | An extremely simple and unified base for physics comes out by starting all over from a single postulate on the common nature of matter and stationary forms of radiation quanta. Basic relativistic, gravitational (G) and quantum mechanical properties of a standing wave particle model have been derived. This has been done... |
2109.00357 | Viktor T. Toth | Viktor T. Toth | Gravitoelectromagnetism and stellar orbits in galaxies | 5 pages, no figures (accepted for publication in Int. J. Mod. Phys.
D) | null | 10.1142/S0218271821501029 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Beyond the Newtonian approximation, gravitational fields in general
relativity can be described using a formalism known as gravitoelectromagnetism.
In this formalism a vector potential, the gravitomagnetic potential, arises as
a result of moving masses, in strong analogy with the magnetic force due to
moving charges ... | [
{
"created": "Tue, 31 Aug 2021 01:21:09 GMT",
"version": "v1"
}
] | 2021-09-02 | [
[
"Toth",
"Viktor T.",
""
]
] | Beyond the Newtonian approximation, gravitational fields in general relativity can be described using a formalism known as gravitoelectromagnetism. In this formalism a vector potential, the gravitomagnetic potential, arises as a result of moving masses, in strong analogy with the magnetic force due to moving charges in... |
1105.5653 | Neelima Kelkar Dr | D. Batic, N. G. Kelkar, M. Nowakowski | Comment on "Quasinormal modes in Schwarzschild-de Sitter spacetime: A
simple derivation of the level spacing of the frequencies" | null | Phys.Rev.D83:108501,2011 | 10.1103/PhysRevD.83.108501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown here that the extraction of quasinormal modes (QNMs) within the
first Born approximation of the scattering amplitude is mathematically not well
founded. Indeed, the constraints on the existence of the scattering amplitude
integral lead to inequalities for the imaginary parts of the QNM frequencies.
For in... | [
{
"created": "Fri, 27 May 2011 20:14:16 GMT",
"version": "v1"
}
] | 2011-06-06 | [
[
"Batic",
"D.",
""
],
[
"Kelkar",
"N. G.",
""
],
[
"Nowakowski",
"M.",
""
]
] | It is shown here that the extraction of quasinormal modes (QNMs) within the first Born approximation of the scattering amplitude is mathematically not well founded. Indeed, the constraints on the existence of the scattering amplitude integral lead to inequalities for the imaginary parts of the QNM frequencies. For inst... |
2303.06563 | Ohkyung Kwon | Craig Hogan, Ohkyung Kwon, and Nathaniel Selub | Angular spectrum of quantum fluctuations in causal structure | 5 pages, 2 figures. PRD accepted version | Phys. Rev. D 109, 123505 (2024) | 10.1103/PhysRevD.109.123505 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scaling arguments are used to constrain the angular spectrum of distortions
on boundaries of macroscopic causal diamonds, produced by Planck-scale vacuum
fluctuations of causally-coherent quantum gravity. The small-angle spectrum of
displacement is derived from a form of scale invariance: the variance and
fluctuation... | [
{
"created": "Sun, 12 Mar 2023 04:05:41 GMT",
"version": "v1"
},
{
"created": "Sun, 12 May 2024 22:00:05 GMT",
"version": "v2"
}
] | 2024-07-02 | [
[
"Hogan",
"Craig",
""
],
[
"Kwon",
"Ohkyung",
""
],
[
"Selub",
"Nathaniel",
""
]
] | Scaling arguments are used to constrain the angular spectrum of distortions on boundaries of macroscopic causal diamonds, produced by Planck-scale vacuum fluctuations of causally-coherent quantum gravity. The small-angle spectrum of displacement is derived from a form of scale invariance: the variance and fluctuation r... |
2310.04514 | Misbah Shahzadi | Misbah Shahzadi, Martin Kolos, Rabia Saleem, Yousaf Habib, Adrian
Eduarte-Rojas | Structure-preserving numerical simulations of test particle dynamics
around slowly rotating neutron stars within Hartle-Thorne approach | 21 pages, 12 figures | Physical Review D, 108, 103006 (2023) | 10.1103/PhysRevD.108.103006 | null | gr-qc astro-ph.HE nlin.CD | http://creativecommons.org/licenses/by/4.0/ | In this paper, we explore the chaotic signatures of the geodesic dynamics for
particles moving in the slowly rotating Hartle-Thorne spacetime; an approximate
solution of vacuum Einstein field equations describing the exterior of a
massive, deformed, and slowly rotating compact object. We employ the numerical
study to... | [
{
"created": "Fri, 6 Oct 2023 18:15:51 GMT",
"version": "v1"
}
] | 2024-03-19 | [
[
"Shahzadi",
"Misbah",
""
],
[
"Kolos",
"Martin",
""
],
[
"Saleem",
"Rabia",
""
],
[
"Habib",
"Yousaf",
""
],
[
"Eduarte-Rojas",
"Adrian",
""
]
] | In this paper, we explore the chaotic signatures of the geodesic dynamics for particles moving in the slowly rotating Hartle-Thorne spacetime; an approximate solution of vacuum Einstein field equations describing the exterior of a massive, deformed, and slowly rotating compact object. We employ the numerical study to e... |
gr-qc/9604014 | Int. Lab. HTSC and Sse | Sergiu I. Vacaru | Stochastic Processes and Diffusion on Spaces with Local Anisotropy | 45 pages, Revtex, submitted to the Journal of Theoretical Probability | G. Tsagas (ed.) "Global Analysis, Differential Geometry and Lie
Algebras" (Geometry Balkan Press, Thessaloniki, Bucharest, 1997), pp. 123-140 | null | null | gr-qc dg-ga math.DG | null | The purpose of this work is to extend the formalism of stochastic calculus to
the case of spaces with local anisotropy (modeled as vector bundles with
compatible nonlinear and distinguished connections and metric structures and
containing as particular cases different variants of Kaluza--Klein and
generalized Lagrang... | [
{
"created": "Fri, 5 Apr 1996 14:27:24 GMT",
"version": "v1"
}
] | 2008-02-03 | [
[
"Vacaru",
"Sergiu I.",
""
]
] | The purpose of this work is to extend the formalism of stochastic calculus to the case of spaces with local anisotropy (modeled as vector bundles with compatible nonlinear and distinguished connections and metric structures and containing as particular cases different variants of Kaluza--Klein and generalized Lagrange ... |
2008.00509 | Geraint Pratten | Geraint Pratten, Alberto Vecchio | Assessing gravitational-wave binary black hole candidates with Bayesian
odds | 23 pages, 11 figures, comments and feedback welcome! | null | 10.1103/PhysRevD.104.124039 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves from the coalescence of binary black holes can be
distinguished from noise transients in a detector network through Bayesian
model selection by exploiting the coherence of the signal across the network.
We present a Bayesian framework for calculating the posterior probability that
a signal is of a... | [
{
"created": "Sun, 2 Aug 2020 16:10:18 GMT",
"version": "v1"
}
] | 2022-01-05 | [
[
"Pratten",
"Geraint",
""
],
[
"Vecchio",
"Alberto",
""
]
] | Gravitational waves from the coalescence of binary black holes can be distinguished from noise transients in a detector network through Bayesian model selection by exploiting the coherence of the signal across the network. We present a Bayesian framework for calculating the posterior probability that a signal is of ast... |
gr-qc/0005037 | Hiroshi Umetsu | Hiroshi Umetsu | A Conserved Energy Integral for Perturbation Equations in the Kerr-de
Sitter Geometry | 13 pages, LaTeX | Prog.Theor.Phys. 104 (2000) 743-755 | 10.1143/PTP.104.743 | EPHOU 00-004 | gr-qc | null | The analytic proof of mode stability of the Kerr black hole was provided by
Whiting. In his proof, the construction of a conserved quantity for unstable
mode was crucial. We extend the method of the analysis for the Kerr-de Sitter
geometry. The perturbation equations of massless fields in the Kerr-de Sitter
geometry ... | [
{
"created": "Thu, 11 May 2000 05:46:46 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Umetsu",
"Hiroshi",
""
]
] | The analytic proof of mode stability of the Kerr black hole was provided by Whiting. In his proof, the construction of a conserved quantity for unstable mode was crucial. We extend the method of the analysis for the Kerr-de Sitter geometry. The perturbation equations of massless fields in the Kerr-de Sitter geometry ca... |
1905.02414 | Jian-Yang Zhu | Yang-yang Wang, Xiao-Min Zhang and Jian-Yang Zhu | Observational Constraints on Two-field Warm Inflation | 13 pages, 6 figures. Accepted for publication in Physical Review D | Phys. Rev. D 99, 103529(2019) | 10.1103/PhysRevD.99.103529 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the two-field warm inflation models with a double quadratic
potential and a linear temperature dependent dissipative coefficient. We
derived the evolution equation of all kinds of perturbations without assuming
slow-roll approximation, and obtained the curvature power spectrum at the end
of inflation with a ... | [
{
"created": "Tue, 7 May 2019 08:54:21 GMT",
"version": "v1"
}
] | 2019-05-23 | [
[
"Wang",
"Yang-yang",
""
],
[
"Zhang",
"Xiao-Min",
""
],
[
"Zhu",
"Jian-Yang",
""
]
] | We study the two-field warm inflation models with a double quadratic potential and a linear temperature dependent dissipative coefficient. We derived the evolution equation of all kinds of perturbations without assuming slow-roll approximation, and obtained the curvature power spectrum at the end of inflation with a fu... |
1611.04569 | Pantelis Apostolopoulos | Pantelis S. Apostolopoulos | Szekeres models: a covariant approach | 16 pages, no figures; (v3) few further amendments and some references
added, final version to appear in Class. Quant. Gravity | Class.Quant.Grav. 34 (2017) no.9, 095013 | 10.1088/1361-6382/aa66df | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We exploit the 1+1+2 formalism to covariantly describe the inhomogeneous and
anisotropic Szekeres models. It is shown that an \emph{average scale length}
can be defined \emph{covariantly} which satisfies a 2d equation of motion
driven from the \emph{effective gravitational mass} (EGM) contained in the dust
cloud. The... | [
{
"created": "Mon, 14 Nov 2016 20:47:08 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Nov 2016 17:38:56 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Mar 2017 06:29:57 GMT",
"version": "v3"
}
] | 2017-04-17 | [
[
"Apostolopoulos",
"Pantelis S.",
""
]
] | We exploit the 1+1+2 formalism to covariantly describe the inhomogeneous and anisotropic Szekeres models. It is shown that an \emph{average scale length} can be defined \emph{covariantly} which satisfies a 2d equation of motion driven from the \emph{effective gravitational mass} (EGM) contained in the dust cloud. The c... |
gr-qc/0607142 | Sushant Ghosh | S. G. Ghosh and D. W. Deshkar | Higher dimensional dust collapse with a cosmological constant | 7 Pages, no figures | Astrophys.Space Sci.310:111-117,2007 | 10.1007/s10509-007-9485-9 | null | gr-qc | null | The general solution of the Einstein equation for higher dimensional (HD)
spherically symmetric collapse of inhomogeneous dust in presence of a
cosmological term, i.e., exact interior solutions of the Einstein field
equations is presented for the HD Tolman-Bondi metrics imbedded in a de Sitter
background. The solutio... | [
{
"created": "Mon, 31 Jul 2006 16:46:07 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Ghosh",
"S. G.",
""
],
[
"Deshkar",
"D. W.",
""
]
] | The general solution of the Einstein equation for higher dimensional (HD) spherically symmetric collapse of inhomogeneous dust in presence of a cosmological term, i.e., exact interior solutions of the Einstein field equations is presented for the HD Tolman-Bondi metrics imbedded in a de Sitter background. The solution ... |
2104.14902 | Yong Xiao | Yong Xiao and Yu Tian | Logarithmic correction to black hole entropy from the nonlocality of
quantum gravity | 9 pages, no figures,latest version accepted by PRD | null | 10.1103/PhysRevD.105.044013 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been known for many years that the leading correction to the black
hole entropy is a logarithmic term, which is universal and closely related to
conformal anomaly. A fully consistent analysis of this issue has to take
quantum backreactions to the black hole geometry into account. However, it was
always unclear... | [
{
"created": "Fri, 30 Apr 2021 11:01:05 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jan 2022 09:48:32 GMT",
"version": "v2"
}
] | 2022-02-23 | [
[
"Xiao",
"Yong",
""
],
[
"Tian",
"Yu",
""
]
] | It has been known for many years that the leading correction to the black hole entropy is a logarithmic term, which is universal and closely related to conformal anomaly. A fully consistent analysis of this issue has to take quantum backreactions to the black hole geometry into account. However, it was always unclear h... |
gr-qc/0307101 | Nicolas Arnaud | Nicolas Arnaud, Matteo Barsuglia, Marie-Anne Bizouard, Violette
Brisson, Fabien Cavalier, Michel Davier, Patrice Hello, Stephane
Kreckelbergh, Edward K. Porter | Detection of a close supernova gravitational wave burst in a network of
interferometers, neutrino and optical detectors | Revised version, accepted for publication in Astroparticle Physics | Astropart.Phys. 21 (2004) 201-221 | 10.1016/j.astropartphys.2003.12.005 | null | gr-qc | null | Trying to detect the gravitational wave (GW) signal emitted by a type II
supernova is a main challenge for the GW community. Indeed, the corresponding
waveform is not accurately modeled as the supernova physics is very complex; in
addition, all the existing numerical simulations agree on the weakness of the
GW emissi... | [
{
"created": "Wed, 23 Jul 2003 16:14:30 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Sep 2003 12:24:12 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Dec 2003 11:08:40 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Arnaud",
"Nicolas",
""
],
[
"Barsuglia",
"Matteo",
""
],
[
"Bizouard",
"Marie-Anne",
""
],
[
"Brisson",
"Violette",
""
],
[
"Cavalier",
"Fabien",
""
],
[
"Davier",
"Michel",
""
],
[
"Hello",
"Patrice",
""
... | Trying to detect the gravitational wave (GW) signal emitted by a type II supernova is a main challenge for the GW community. Indeed, the corresponding waveform is not accurately modeled as the supernova physics is very complex; in addition, all the existing numerical simulations agree on the weakness of the GW emission... |
1611.00056 | Gabriel Menezes | G. Menezes | Spontaneous excitation of an atom in a Kerr spacetime | Accepted for publication in Physical Review D | Phys. Rev. D 95, 065015 (2017) | 10.1103/PhysRevD.95.065015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider radiative processes of an atom in a rotating black-hole
background. We assume the atom, represented by a hypothetical two-level system,
is coupled via a monopole interaction with a massless quantum scalar field
prepared in each one of the usual physical vacuum states of interest. We
constrain ourselves to... | [
{
"created": "Mon, 31 Oct 2016 21:41:15 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Feb 2017 14:50:34 GMT",
"version": "v2"
}
] | 2017-03-29 | [
[
"Menezes",
"G.",
""
]
] | We consider radiative processes of an atom in a rotating black-hole background. We assume the atom, represented by a hypothetical two-level system, is coupled via a monopole interaction with a massless quantum scalar field prepared in each one of the usual physical vacuum states of interest. We constrain ourselves to t... |
gr-qc/0403013 | Antonio F. Ranada | Antonio F. Ranada | The Pioneer anomaly as an effect of the dynamics of time | 25 pages,2 figures. New text and new figures in this version | null | null | null | gr-qc | null | A model is presented in which the Pioneer anomaly is not related to the
motion of the spaceship, but is a consequence of the acceleration of the
cosmological proper time $\tau$ with respect to the coordinate parametric time
$t$, what is an effect of the background gravitational potential of the entire
universe. The l... | [
{
"created": "Tue, 2 Mar 2004 18:07:20 GMT",
"version": "v1"
},
{
"created": "Wed, 5 May 2004 10:06:56 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Jul 2004 11:01:02 GMT",
"version": "v3"
},
{
"created": "Thu, 25 Nov 2004 12:29:04 GMT",
"version": "v4"
}
] | 2009-09-29 | [
[
"Ranada",
"Antonio F.",
""
]
] | A model is presented in which the Pioneer anomaly is not related to the motion of the spaceship, but is a consequence of the acceleration of the cosmological proper time $\tau$ with respect to the coordinate parametric time $t$, what is an effect of the background gravitational potential of the entire universe. The lig... |
1908.04406 | Gauranga Samanta | Gauranga C Samanta and Nisha Godani | Validation of Energy Conditions in Wormhole Geometry within Viable
$f(R)$ Gravity | 18 pages, 7 figures | Eur. Phys. J. C (2019) 79: 623 | 10.1140/epjc/s10052-019-7116-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, wormholes, tunnel like structures introduced by Morris \&
Thorne \cite{Morris95}, are explored within the framework of $f(R)$ gravity.
Using the shape function $b(r)=r_0\big(\frac{r}{r_0}\big)^\gamma$, where
$0<\gamma<1$, and the equation of state $p_r=\omega\rho$, the $f(R)$ function
is derived and the... | [
{
"created": "Tue, 6 Aug 2019 03:09:21 GMT",
"version": "v1"
}
] | 2019-08-14 | [
[
"Samanta",
"Gauranga C",
""
],
[
"Godani",
"Nisha",
""
]
] | In this work, wormholes, tunnel like structures introduced by Morris \& Thorne \cite{Morris95}, are explored within the framework of $f(R)$ gravity. Using the shape function $b(r)=r_0\big(\frac{r}{r_0}\big)^\gamma$, where $0<\gamma<1$, and the equation of state $p_r=\omega\rho$, the $f(R)$ function is derived and the f... |
gr-qc/0106054 | L. Sriramkumar | L. Sriramkumar | On the response of non-linearly coupled, accelerated detectors in
odd-dimensional flat spacetimes | RevTeX, 8 Pages, 2 Figures | null | null | null | gr-qc | null | In this note, we consider the response of a uniformly accelerated monopole
detector that is coupled non-linearly to the nth power of a quantum scalar
field in (D+1)-dimensional flat spacetime. We show that, when (D+1) is even,
the response of the detector in the Minkowski vacuum is characterized by a
Bose-Einstein fa... | [
{
"created": "Fri, 15 Jun 2001 23:25:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sriramkumar",
"L.",
""
]
] | In this note, we consider the response of a uniformly accelerated monopole detector that is coupled non-linearly to the nth power of a quantum scalar field in (D+1)-dimensional flat spacetime. We show that, when (D+1) is even, the response of the detector in the Minkowski vacuum is characterized by a Bose-Einstein fact... |
gr-qc/9910024 | Takashi Tamaki | Takashi Tamaki, Kei-ichi Maeda | The fate of Reissner-Nortstr\"{o}m black hole in the
Einstein-Yang-Mills-Higgs system | 9 pages, 8 figures | null | 10.1103/PhysRevD.62.084041 | null | gr-qc hep-th | null | We study about an evaporating process of black holes in SO(3)
Einstein-Yang-Mills-Higgs system. We consider a massless scalar field which
couple neither with the Yang-Mills field nor with the Higgs field surrounding
the black hole. We discuss differences in evaporating rate between a monopole
black hole and a Reissne... | [
{
"created": "Thu, 7 Oct 1999 10:28:28 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Jun 2000 09:46:34 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Tamaki",
"Takashi",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We study about an evaporating process of black holes in SO(3) Einstein-Yang-Mills-Higgs system. We consider a massless scalar field which couple neither with the Yang-Mills field nor with the Higgs field surrounding the black hole. We discuss differences in evaporating rate between a monopole black hole and a Reissner-... |
1407.4875 | Jun-Jin Peng | Jun-Jin Peng | Conserved charges of black holes in Weyl and Einstein-Gauss-Bonnet
gravities | 21 Pages, no figures, references added | null | 10.1140/epjc/s10052-014-3156-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An off-shell generalization of the Abbott-Deser-Tekin (ADT) conserved charge
was recently proposed by Kim et al. They achieved this by introducing off-shell
Noether currents and potentials. In this paper, we construct the crucial
off-shell Noether current by the variation of the Bianchi identity for the
expression of... | [
{
"created": "Fri, 18 Jul 2014 02:57:40 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Aug 2014 07:01:13 GMT",
"version": "v2"
}
] | 2015-06-22 | [
[
"Peng",
"Jun-Jin",
""
]
] | An off-shell generalization of the Abbott-Deser-Tekin (ADT) conserved charge was recently proposed by Kim et al. They achieved this by introducing off-shell Noether currents and potentials. In this paper, we construct the crucial off-shell Noether current by the variation of the Bianchi identity for the expression of m... |
gr-qc/9607049 | Reza Mansouri | M. Khorrami, M. Mansouri, M. Mohazzab | A Decrumpling Model of the Universe | 4 pages, Latex file, contribution to Journees Relativistes 96 | Helv.Phys.Acta 69 (1996) 237-240 | null | null | gr-qc | null | Assuming a cellular structure for the space-time, we propose a model in which
the expansion of the universe is understood as a decrumpling process, much like
the one we know from polymeric surfaces. The dimension of space is then a
dynamical real variable. The generalized Friedmann equation, derived from a
Lagrangian... | [
{
"created": "Tue, 23 Jul 1996 11:47:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Khorrami",
"M.",
""
],
[
"Mansouri",
"M.",
""
],
[
"Mohazzab",
"M.",
""
]
] | Assuming a cellular structure for the space-time, we propose a model in which the expansion of the universe is understood as a decrumpling process, much like the one we know from polymeric surfaces. The dimension of space is then a dynamical real variable. The generalized Friedmann equation, derived from a Lagrangian, ... |
1506.04253 | Manuel Hohmann | Manuel Hohmann | Parameterized post-Newtonian limit of Horndeski's gravity theory | 33 pages, no figures; journal version | Phys. Rev. D 92, 064019 (2015) | 10.1103/PhysRevD.92.064019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the parameterized post-Newtonian (PPN) limit of Horndeski's theory
of gravity, also known under the name generalized G-inflation or
$\text{G}^2$-inflation, which is the most general scalar-tensor theory of
gravity with at most second order field equations in four dimensions. We derive
conditions on the act... | [
{
"created": "Sat, 13 Jun 2015 11:16:54 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Sep 2015 06:40:59 GMT",
"version": "v2"
}
] | 2015-09-17 | [
[
"Hohmann",
"Manuel",
""
]
] | We discuss the parameterized post-Newtonian (PPN) limit of Horndeski's theory of gravity, also known under the name generalized G-inflation or $\text{G}^2$-inflation, which is the most general scalar-tensor theory of gravity with at most second order field equations in four dimensions. We derive conditions on the actio... |
1712.04226 | Ricardo Landim | Orfeu Bertolami, Ricardo G. Landim | Cosmic Transients, Einstein's Equivalence Principle and Dark Matter
Halos | 6 pages, 4 tables. Published version | Phys.Dark Univ. 21 (2018) 16-20 | 10.1016/j.dark.2018.05.002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmic transients, such as gamma-ray bursts and fast radio bursts, have been
used to constrain the Einstein's Equivalence Principle (EEP) through the
parametrized-post-Newtonian (PPN) formalism. In this approach, the time delay
of photons with different energies from these cosmic transients are used to
obtain upper b... | [
{
"created": "Tue, 12 Dec 2017 10:57:30 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jan 2018 14:44:51 GMT",
"version": "v2"
},
{
"created": "Sun, 10 Jun 2018 22:47:39 GMT",
"version": "v3"
}
] | 2018-06-12 | [
[
"Bertolami",
"Orfeu",
""
],
[
"Landim",
"Ricardo G.",
""
]
] | Cosmic transients, such as gamma-ray bursts and fast radio bursts, have been used to constrain the Einstein's Equivalence Principle (EEP) through the parametrized-post-Newtonian (PPN) formalism. In this approach, the time delay of photons with different energies from these cosmic transients are used to obtain upper bou... |
1010.1846 | Reza Saffari | Robab Hashemi and Reza Saffari | A Well-Behaved f(R) Gravity Model in Planetary Motions | 15 pages, 1 figure, LaTEX, Accepted for publication in Planetary
Space and Science, References added, Minor revision | Planet.Space Sci. 59:338-342,2011 | 10.1016/j.pss.2010.12.011 | null | gr-qc astro-ph.EP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider asymptotic behavior of a hybrid action of f(R)
gravity model which proposed by Saffari and Rahvar (2008), in solar system
scale, which can explain Pioneer anomalous acceleration. We use the potential
coming from this hybrid action in weak field limit to test its impacts on Solar
system dynam... | [
{
"created": "Sat, 9 Oct 2010 13:23:19 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Dec 2010 08:09:15 GMT",
"version": "v2"
},
{
"created": "Sun, 12 Dec 2010 09:34:25 GMT",
"version": "v3"
}
] | 2011-02-18 | [
[
"Hashemi",
"Robab",
""
],
[
"Saffari",
"Reza",
""
]
] | In this paper we consider asymptotic behavior of a hybrid action of f(R) gravity model which proposed by Saffari and Rahvar (2008), in solar system scale, which can explain Pioneer anomalous acceleration. We use the potential coming from this hybrid action in weak field limit to test its impacts on Solar system dynamic... |
2408.06399 | Maurice H. P. M. Van Putten | Maurice H.P.M. van Putten | Galaxy dynamics tracing quantum cosmology beyond $\Lambda$CDM below the
de Sitter scale of acceleration | 8 pages | CJPh 91 (2024) 377-381 | 10.1016/j.cjph.2024.07.040 | null | gr-qc astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | It is proposed that the baryonic Tully-Fisher relation (bTFR) and JWST
'Impossible galaxies' at cosmic dawn are unified in weak gravity by the trace
$J$ of the Schouten tensor below the Sitter scale of acceleration $a_{dS}=cH$,
where $c$ is the velocity of light and $H$ is the Hubble parameter. Across
$a_{dS}$, $J$ p... | [
{
"created": "Mon, 12 Aug 2024 09:06:35 GMT",
"version": "v1"
}
] | 2024-08-15 | [
[
"van Putten",
"Maurice H. P. M.",
""
]
] | It is proposed that the baryonic Tully-Fisher relation (bTFR) and JWST 'Impossible galaxies' at cosmic dawn are unified in weak gravity by the trace $J$ of the Schouten tensor below the Sitter scale of acceleration $a_{dS}=cH$, where $c$ is the velocity of light and $H$ is the Hubble parameter. Across $a_{dS}$, $J$ par... |
gr-qc/0111040 | Garry Ludwig | Garry Ludwig and S. Brian Edgar | (Conformal) Killing vectors in the Newman-Penrose formalism | 27 pages | Gen.Rel.Grav. 34 (2002) 807-835 | 10.1023/A:1016361729933 | null | gr-qc | null | This paper presents an efficient technique for finding Killing, homothetic,
or even proper conformal Killing vectors in the Newman-Penrose (NP) formalism.
Leaning on, and extending, results previously derived in the GHP formalism we
show that the (conformal) Killing equations can be replaced by a set of
equations inv... | [
{
"created": "Tue, 13 Nov 2001 22:16:18 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"Ludwig",
"Garry",
""
],
[
"Edgar",
"S. Brian",
""
]
] | This paper presents an efficient technique for finding Killing, homothetic, or even proper conformal Killing vectors in the Newman-Penrose (NP) formalism. Leaning on, and extending, results previously derived in the GHP formalism we show that the (conformal) Killing equations can be replaced by a set of equations invol... |
gr-qc/0308038 | Kayll Lake | Kayll Lake | Differential Invariants of the Kerr Vacuum | 12 pages 8 figures. Much more information at
http://grtensor.org/diffweyl/ | Gen.Rel.Grav. 36 (2004) 1159 | 10.1023/B:GERG.0000018282.42275.cb | null | gr-qc | null | The norms associated with the gradients of the two non-differential
invariants of the Kerr vacuum are examined. Whereas both locally single out the
horizons, their global behavior is more interesting. Both reflect the
background angular momentum as the volume of space allowing a timelike gradient
decreases with incre... | [
{
"created": "Tue, 12 Aug 2003 17:30:47 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Lake",
"Kayll",
""
]
] | The norms associated with the gradients of the two non-differential invariants of the Kerr vacuum are examined. Whereas both locally single out the horizons, their global behavior is more interesting. Both reflect the background angular momentum as the volume of space allowing a timelike gradient decreases with increas... |
1704.08925 | Nelson A. Lima | Georgios Kofinas and Nelson A. Lima | Dynamics of cosmological perturbations in modified Brans-Dicke cosmology
with matter-scalar field interaction | 20 pages, 5 figues. Version 2 with minor revisions to match
manuscript accepted by PRD | Phys. Rev. D 96, 084016 (2017) | 10.1103/PhysRevD.96.084016 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we focus on a novel completion of the well-known Brans-Dicke
theory that introduces an interaction between the dark energy and dark matter
sectors, known as complete Brans-Dicke (CBD) theory. We obtain viable
cosmological accelerating solutions that fit Supernovae observations with great
precision withou... | [
{
"created": "Thu, 27 Apr 2017 12:59:46 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Sep 2017 10:44:29 GMT",
"version": "v2"
}
] | 2017-10-10 | [
[
"Kofinas",
"Georgios",
""
],
[
"Lima",
"Nelson A.",
""
]
] | In this work we focus on a novel completion of the well-known Brans-Dicke theory that introduces an interaction between the dark energy and dark matter sectors, known as complete Brans-Dicke (CBD) theory. We obtain viable cosmological accelerating solutions that fit Supernovae observations with great precision without ... |
gr-qc/9501011 | David Scialom | David Scialom and Philippe Jetzer | ASYMPTOTIC BEHAVIOR OF COMPLEX SCALAR FIELDS IN A FRIEDMAN-LEMAITRE
UNIVERSE | uuencoded, compressed tarfile containing a 15 pages Latex file and 2
postscipt figures. Accepted for publication on Phys. Rev. D | Phys.Rev.D51:5698-5706,1995 | 10.1103/PhysRevD.51.5698 | ZU-TH 22/94 | gr-qc astro-ph | null | We study the coupled Einstein-Klein-Gordon equations for a complex scalar
field with and without a quartic self-interaction in a curvatureless
Friedman-Lema\^{\i}\-tre Universe. The equations can be written as a set of
four coupled first order non-linear differential equations, for which we
establish the phase portra... | [
{
"created": "Thu, 12 Jan 1995 16:41:02 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Scialom",
"David",
""
],
[
"Jetzer",
"Philippe",
""
]
] | We study the coupled Einstein-Klein-Gordon equations for a complex scalar field with and without a quartic self-interaction in a curvatureless Friedman-Lema\^{\i}\-tre Universe. The equations can be written as a set of four coupled first order non-linear differential equations, for which we establish the phase portrait... |
1801.06549 | Jose Natario | Jo\~ao L. Costa, Jos\'e Nat\'ario, Pedro Oliveira | Cosmic no-hair in spherically symmetric black hole spacetimes | 32 pages, 1 figure; v2: minor corrections; v3: a few corrections
added to match the final published version | Ann. Henri Poincar\'e 20 (2019) 3059-3090 | 10.1007/s00023-019-00825-z | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze in detail the geometry and dynamics of the cosmological region
arising in spherically symmetric black hole solutions of the
Einstein-Maxwell-scalar field system with a positive cosmological constant.
More precisely, we solve, for such a system, a characteristic initial value
problem with data emulating a d... | [
{
"created": "Fri, 19 Jan 2018 19:00:09 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jul 2018 17:39:59 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Sep 2019 12:48:15 GMT",
"version": "v3"
}
] | 2019-09-05 | [
[
"Costa",
"João L.",
""
],
[
"Natário",
"José",
""
],
[
"Oliveira",
"Pedro",
""
]
] | We analyze in detail the geometry and dynamics of the cosmological region arising in spherically symmetric black hole solutions of the Einstein-Maxwell-scalar field system with a positive cosmological constant. More precisely, we solve, for such a system, a characteristic initial value problem with data emulating a dyn... |
2403.02852 | Rituparna Mandal | Rituparna Mandal, Soma Sanyal | Asymptotically safe cosmology with non-canonical scalar field | 23 pages, 1 table | null | null | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | We investigate the quantum modified cosmological dynamical equations in a
Friedmann-Robertson-Walker universe filled with a barotropic fluid and a
general non-canonical scalar field characterized by a Lagrangian similar to
k-essence model but with a potential term. Quantum corrections are incorporated
by considering ... | [
{
"created": "Tue, 5 Mar 2024 10:48:41 GMT",
"version": "v1"
}
] | 2024-03-06 | [
[
"Mandal",
"Rituparna",
""
],
[
"Sanyal",
"Soma",
""
]
] | We investigate the quantum modified cosmological dynamical equations in a Friedmann-Robertson-Walker universe filled with a barotropic fluid and a general non-canonical scalar field characterized by a Lagrangian similar to k-essence model but with a potential term. Quantum corrections are incorporated by considering th... |
0905.2464 | Tiberiu Harko | Tiberiu Harko | Matter Accretion by Brane-World Black Holes | 25 pages, accepted for publication in Journal of the Korean Physical
Society | Journal of the Korean Physical Society, 54: 2583-2594, 2009 | 10.3938/jkps.54.2583 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The brane-world description of our universe entails a large extra dimension
and a fundamental scale of gravity that might be lower by several orders of
magnitude compared to the Planck scale. An interesting consequence of the
brane-world scenario is in the nature of spherically symmetric vacuum solutions
to the brane... | [
{
"created": "Fri, 15 May 2009 03:37:57 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Harko",
"Tiberiu",
""
]
] | The brane-world description of our universe entails a large extra dimension and a fundamental scale of gravity that might be lower by several orders of magnitude compared to the Planck scale. An interesting consequence of the brane-world scenario is in the nature of spherically symmetric vacuum solutions to the brane g... |
2104.14850 | Javier Olmedo | Mercedes Mart\'in-Benito, Rita B. Neves and Javier Olmedo | Non-oscillatory power spectrum from States of Low Energy in kinetically
dominated early universes | 13 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, States of Low Energy (SLEs) have been proposed as viable vacuum
states of primordial perturbations within Loop Quantum Cosmology (LQC). In this
work we investigate the effect of the high curvature region of LQC on the
definition of SLEs. Shifting the support of the test function that defines them
away from ... | [
{
"created": "Fri, 30 Apr 2021 09:03:57 GMT",
"version": "v1"
}
] | 2021-05-03 | [
[
"Martín-Benito",
"Mercedes",
""
],
[
"Neves",
"Rita B.",
""
],
[
"Olmedo",
"Javier",
""
]
] | Recently, States of Low Energy (SLEs) have been proposed as viable vacuum states of primordial perturbations within Loop Quantum Cosmology (LQC). In this work we investigate the effect of the high curvature region of LQC on the definition of SLEs. Shifting the support of the test function that defines them away from th... |
gr-qc/0608026 | Papantonopoulos Eleftherios | Eleftherios Papantonopoulos and Vassilios Zamarias | Curvaton Dynamics in Brane-worlds | 47 pages, 1 figure, references added, to be published in JCAP | JCAP0611:005,2006 | 10.1088/1475-7516/2006/11/005 | null | gr-qc hep-th | null | We study the curvaton dynamics in brane-world cosmologies. Assuming that the
inflaton field survives without decay after the end of inflation, we apply the
curvaton reheating mechanism to Randall-Sundrum and to its curvature
corrections: Gauss-Bonnet, induced gravity and combined Gauss-Bonnet and
induced gravity cosm... | [
{
"created": "Fri, 4 Aug 2006 12:53:46 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Oct 2006 12:39:21 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Papantonopoulos",
"Eleftherios",
""
],
[
"Zamarias",
"Vassilios",
""
]
] | We study the curvaton dynamics in brane-world cosmologies. Assuming that the inflaton field survives without decay after the end of inflation, we apply the curvaton reheating mechanism to Randall-Sundrum and to its curvature corrections: Gauss-Bonnet, induced gravity and combined Gauss-Bonnet and induced gravity cosmol... |
gr-qc/9801063 | Franz Schunck | Eckehard W. Mielke and Franz E. Schunck | Boson Stars: Early History and Recent Prospects | 20 pages, 1 Postscript figure, LaTeX, uses mprocl.sty | Report of parallel session chair in: Proc. 8th M. Grossmann
Meeting, T. Piran (ed.), World Scientific, Singapore 1998, to be published | null | SUSSEX 97/9 | gr-qc | null | Boson stars are descendants of the so-called geons of Wheeler, except that
they are built from scalar particles instead of electromagnetic fields. If
scalar fields exist in nature, such localized configurations kept together by
their self-generated gravitational field can form within Einstein's general
relativity. In... | [
{
"created": "Mon, 19 Jan 1998 20:45:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mielke",
"Eckehard W.",
""
],
[
"Schunck",
"Franz E.",
""
]
] | Boson stars are descendants of the so-called geons of Wheeler, except that they are built from scalar particles instead of electromagnetic fields. If scalar fields exist in nature, such localized configurations kept together by their self-generated gravitational field can form within Einstein's general relativity. In t... |
2311.07403 | Evgenii Ievlev | Evgenii Ievlev | Moving mirrors and event horizons in non-flat background geometry | 12 pages, 4 figures; overall revision | Class. Quantum Grav. 41 155009 (2024) | 10.1088/1361-6382/ad5bb4 | FTPI-MINN-23-21 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Moving mirrors have been used for a long time as simple models for studying
various properties of black hole radiation, such as the thermal spectrum and
entanglement entropy. These models are typically constructed to mimic the
collapse of a spherically symmetric distribution of matter in the Minkowski
background. We ... | [
{
"created": "Mon, 13 Nov 2023 15:33:51 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jul 2024 17:24:21 GMT",
"version": "v2"
}
] | 2024-07-09 | [
[
"Ievlev",
"Evgenii",
""
]
] | Moving mirrors have been used for a long time as simple models for studying various properties of black hole radiation, such as the thermal spectrum and entanglement entropy. These models are typically constructed to mimic the collapse of a spherically symmetric distribution of matter in the Minkowski background. We ge... |
1705.07518 | Orfeu Bertolami | Orfeu Bertolami and Jorge P\'aramos | Using a non-minimal coupling between matter and curvature to sequester
the Cosmological Constant | 8 pages. To match version published at General Relativity and
Gravitation, May 2020 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel mechanism for generating a Cosmological Constant and
suitably sequestering the vacuum contribution to it, so that the eponymous
Cosmological Constant problem is avoided.
We do so by resorting to a model endowed with a non-minimal coupling between
curvature and matter in an appropriately defined r... | [
{
"created": "Sun, 21 May 2017 22:40:47 GMT",
"version": "v1"
},
{
"created": "Wed, 16 May 2018 16:11:31 GMT",
"version": "v2"
},
{
"created": "Fri, 8 May 2020 11:36:18 GMT",
"version": "v3"
}
] | 2020-05-11 | [
[
"Bertolami",
"Orfeu",
""
],
[
"Páramos",
"Jorge",
""
]
] | We present a novel mechanism for generating a Cosmological Constant and suitably sequestering the vacuum contribution to it, so that the eponymous Cosmological Constant problem is avoided. We do so by resorting to a model endowed with a non-minimal coupling between curvature and matter in an appropriately defined relax... |
gr-qc/9810060 | Mihaela Time | Mihaela Time | A Stationary Asymptotically Einstein Static Universe Solution | 7 pages, LaTeX | null | null | null | gr-qc | null | Here I present a stationary cylindrically symmetric asymptotically Einstein
static universe solution with the matter consisting of a cosmological and
rotating dust term which admits predicted black hole event horizon.
| [
{
"created": "Sun, 18 Oct 1998 19:28:14 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Jan 1999 19:00:33 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Jan 1999 18:45:40 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Time",
"Mihaela",
""
]
] | Here I present a stationary cylindrically symmetric asymptotically Einstein static universe solution with the matter consisting of a cosmological and rotating dust term which admits predicted black hole event horizon. |
1203.6185 | Zhoujian Cao Dr | Zhoujian Cao, Jui-Ping Yu, Chun-Yu Lin, Shan Bai and Hwei-Jang Yo | Perturbational Treatment of the Gravitational Potential Effect on Binary
Black Hole Evolution | updated version of Journal of Physics: Conference Series 330 (2011)
012016 | Journal of Physics: Conference Series 330 (2011) 012016 | 10.1088/1742-6596/330/1/012016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary black hole (BBH) systems are usually located in the gravitational
potential well formed by a massive black hole (BH), which is mostly located in
the center of a galaxy. In most existing studies, the BBH systems are treated
as isolated systems, while the effect of the background is ignored. The
validity of the ... | [
{
"created": "Wed, 28 Mar 2012 07:41:18 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Cao",
"Zhoujian",
""
],
[
"Yu",
"Jui-Ping",
""
],
[
"Lin",
"Chun-Yu",
""
],
[
"Bai",
"Shan",
""
],
[
"Yo",
"Hwei-Jang",
""
]
] | Binary black hole (BBH) systems are usually located in the gravitational potential well formed by a massive black hole (BH), which is mostly located in the center of a galaxy. In most existing studies, the BBH systems are treated as isolated systems, while the effect of the background is ignored. The validity of the ap... |
1301.2370 | Yu-ichi Takamizu | Yu-ichi Takamizu and Tsutomu Kobayashi | Nonlinear superhorizon curvature perturbation in generic single-field
inflation | 14 pages, version to appear in PTEP | Prog. Theor. Exp. Phys. 2013, 063E03 | 10.1093/ptep/ptt033 | YITP-13-1, RUP-12-12 | gr-qc astro-ph.CO hep-th nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a theory of nonlinear cosmological perturbations on superhorizon
scales for generic single-field inflation. Our inflaton is described by the
Lagrangian of the form $W(X,\phi)-G(X,\phi)\Box\phi$ with
$X=-\partial^{\mu}\phi\partial_{\mu}\phi/2$, which is no longer equivalent to a
perfect fluid. This model is... | [
{
"created": "Fri, 11 Jan 2013 01:27:35 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jun 2013 02:26:35 GMT",
"version": "v2"
}
] | 2013-06-04 | [
[
"Takamizu",
"Yu-ichi",
""
],
[
"Kobayashi",
"Tsutomu",
""
]
] | We develop a theory of nonlinear cosmological perturbations on superhorizon scales for generic single-field inflation. Our inflaton is described by the Lagrangian of the form $W(X,\phi)-G(X,\phi)\Box\phi$ with $X=-\partial^{\mu}\phi\partial_{\mu}\phi/2$, which is no longer equivalent to a perfect fluid. This model is m... |
1507.01686 | Eckhard Strobel | Cl\'ement Stahl and Eckhard Strobel and She-Sheng Xue | Fermionic current and Schwinger effect in de Sitter spacetime | 19 pages, 1 figure, V2:small changes and some references added,
version accepted for publication in Phys. Rev. D | Phys. Rev. D 93, 025004 (2016) | 10.1103/PhysRevD.93.025004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the fermionic Schwinger effect in two dimensional de Sitter
spacetime. To do so we first present a method to semiclassically compute the
number of pairs created per momentum mode for general time dependent fields. In
addition the constant electric field is studied in depth. In this case
solutions for the Dir... | [
{
"created": "Tue, 7 Jul 2015 06:53:22 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jan 2016 14:19:34 GMT",
"version": "v2"
}
] | 2016-01-13 | [
[
"Stahl",
"Clément",
""
],
[
"Strobel",
"Eckhard",
""
],
[
"Xue",
"She-Sheng",
""
]
] | We study the fermionic Schwinger effect in two dimensional de Sitter spacetime. To do so we first present a method to semiclassically compute the number of pairs created per momentum mode for general time dependent fields. In addition the constant electric field is studied in depth. In this case solutions for the Dirac... |
gr-qc/0602101 | Muxin Han | Muxin Han, Yongge Ma | Dynamics of Scalar Field in Polymer-like Representation | 24 pages, accepted for pubilcation in Class. Quant. Grav | Class.Quant.Grav. 23 (2006) 2741-2760 | 10.1088/0264-9381/23/7/031 | null | gr-qc math-ph math.MP quant-ph | null | In recent twenty years, loop quantum gravity, a background independent
approach to unify general relativity and quantum mechanics, has been widely
investigated. We consider the quantum dynamics of a real massless scalar field
coupled to gravity in this framework. A Hamiltonian operator for the scalar
field can be wel... | [
{
"created": "Fri, 24 Feb 2006 17:56:08 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Han",
"Muxin",
""
],
[
"Ma",
"Yongge",
""
]
] | In recent twenty years, loop quantum gravity, a background independent approach to unify general relativity and quantum mechanics, has been widely investigated. We consider the quantum dynamics of a real massless scalar field coupled to gravity in this framework. A Hamiltonian operator for the scalar field can be well ... |
2111.03827 | Brett McInnes | Brett McInnes | Extremal Instability for Topological Black Holes | 17 pages, no figures; version to appear in Nuclear Physics B | null | 10.1016/j.nuclphysb.2022.115760 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The initial idea underlying the Weak Gravity Conjecture is that extremal
black holes must always be "unstable", in the sense that they should slowly
decay by emitting either particles or smaller black holes. Here we show that,
when this idea is applied to the \emph{planar} asymptotically AdS black holes
which play a ... | [
{
"created": "Sat, 6 Nov 2021 08:01:57 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Mar 2022 10:03:37 GMT",
"version": "v2"
}
] | 2022-04-13 | [
[
"McInnes",
"Brett",
""
]
] | The initial idea underlying the Weak Gravity Conjecture is that extremal black holes must always be "unstable", in the sense that they should slowly decay by emitting either particles or smaller black holes. Here we show that, when this idea is applied to the \emph{planar} asymptotically AdS black holes which play a ce... |
1505.07371 | Alexis Helou | Alexis Helou | Dynamics of the four kinds of Trapping Horizons and Existence of Hawking
Radiation | 22 pages, 4 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We work with the notion of apparent/trapping horizons for spherically
symmetric, dynamical spacetimes: these are quasi-locally defined, simply based
on the behaviour of congruence of light rays. We show that the sign of the
dynamical Hayward-Kodama surface gravity is dictated by the inner/outer nature
of the horizon.... | [
{
"created": "Wed, 27 May 2015 15:20:09 GMT",
"version": "v1"
}
] | 2015-05-28 | [
[
"Helou",
"Alexis",
""
]
] | We work with the notion of apparent/trapping horizons for spherically symmetric, dynamical spacetimes: these are quasi-locally defined, simply based on the behaviour of congruence of light rays. We show that the sign of the dynamical Hayward-Kodama surface gravity is dictated by the inner/outer nature of the horizon. U... |
2007.06907 | Soumya Jana | Soumya Jana, Charles Dalang, Lucas Lombriser | Horndeski theories and beyond from higher dimensions | 29 pages, published version | Class. Quantum Grav. 38 (2021) 025003 | 10.1088/1361-6382/abc272 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein-Hilbert action with a cosmological constant is the most general
local four-dimensional action leading to second-order derivative equations of
motion that are symmetric and divergence free. In higher dimensions, additional
terms can appear. We investigate a generalised metric decomposition involving a
sca... | [
{
"created": "Tue, 14 Jul 2020 08:38:17 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Feb 2021 07:30:32 GMT",
"version": "v2"
}
] | 2021-02-09 | [
[
"Jana",
"Soumya",
""
],
[
"Dalang",
"Charles",
""
],
[
"Lombriser",
"Lucas",
""
]
] | The Einstein-Hilbert action with a cosmological constant is the most general local four-dimensional action leading to second-order derivative equations of motion that are symmetric and divergence free. In higher dimensions, additional terms can appear. We investigate a generalised metric decomposition involving a scala... |
2205.15277 | Joao G. Rosa | John March-Russell and Jo\~ao G. Rosa | Micro-Bose/Proca dark matter stars from black hole superradiance | 5 pages, 2 figures | null | null | null | gr-qc astro-ph.CO hep-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We study the production of heavy, $\mu \gtrsim 1$ TeV, bosonic spin $s=0,1$
dark matter (DM) via the simultaneous processes of Hawking evaporation and
superradiance (SR) from an initial population of small, $\lesssim 10^6$ kg,
primordial black holes (PBHs). Even for small initial PBH spins the SR process
can produce ... | [
{
"created": "Mon, 30 May 2022 17:38:51 GMT",
"version": "v1"
}
] | 2022-05-31 | [
[
"March-Russell",
"John",
""
],
[
"Rosa",
"João G.",
""
]
] | We study the production of heavy, $\mu \gtrsim 1$ TeV, bosonic spin $s=0,1$ dark matter (DM) via the simultaneous processes of Hawking evaporation and superradiance (SR) from an initial population of small, $\lesssim 10^6$ kg, primordial black holes (PBHs). Even for small initial PBH spins the SR process can produce ex... |
gr-qc/9803072 | Kayll Lake | Kayll Lake | GR 15 Proceedings A5(ii) Computer Methods in GR: Algebraic computing | 7 pages, uses crckapb.sty | null | null | null | gr-qc | null | Algebraic computing in relativity and gravitation dates back more than thirty
years, but only relatively recently has hardware of sufficient power to tackle
large scale calculations become commonplace. Whereas it is generally understood
throughout the relativity community that there are a number of packages
available... | [
{
"created": "Thu, 19 Mar 1998 16:13:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lake",
"Kayll",
""
]
] | Algebraic computing in relativity and gravitation dates back more than thirty years, but only relatively recently has hardware of sufficient power to tackle large scale calculations become commonplace. Whereas it is generally understood throughout the relativity community that there are a number of packages available, ... |
gr-qc/9805003 | Ken D. Olum | Ken D. Olum | Superluminal travel requires negative energies | 5 pages, RevTeX, 2 figures with epsf. This paper now contains all the
material of gr-qc/6805003 and gr-qc/9806091 since these became a single
article in Phys. Rev. Lett | Phys.Rev.Lett. 81 (1998) 3567-3570 | 10.1103/PhysRevLett.81.3567 | null | gr-qc | null | I investigate the relationship between faster-than-light travel and
weak-energy-condition violation, i.e., negative energy densities. In a general
spacetime it is difficult to define faster-than-light travel, and I give an
example of a metric which appears to allow superluminal travel, but in fact is
just flat space.... | [
{
"created": "Fri, 1 May 1998 19:39:39 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 1998 18:55:32 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Olum",
"Ken D.",
""
]
] | I investigate the relationship between faster-than-light travel and weak-energy-condition violation, i.e., negative energy densities. In a general spacetime it is difficult to define faster-than-light travel, and I give an example of a metric which appears to allow superluminal travel, but in fact is just flat space. T... |
1606.04097 | Supriya Pan | Supriya Pan, Barun Kumar Pal and Souvik Pramanik | Gravitationally influenced particle creation models and late-time cosmic
acceleration | 12 pages, 2 Tables, 5 Figures, title has been changed; published in
Int. J. Geom. Meth. Mod. Phys | Int. J. Geom. Meth. Mod. Phys. 15 (2018), no. 03, 1850042 | 10.1142/S0219887818500421 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we focus on the gravitationally influenced adiabatic particle
creation process, a mechanism that does not need any dark energy or modified
gravity models to explain the current accelerating phase of the universe.
Introducing some particle creation models that generalize some previous models
in the litera... | [
{
"created": "Mon, 13 Jun 2016 15:38:14 GMT",
"version": "v1"
},
{
"created": "Sat, 18 Jun 2016 13:20:27 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Jan 2018 17:49:13 GMT",
"version": "v3"
},
{
"created": "Sun, 8 Apr 2018 07:24:17 GMT",
"version": "v4"
}
] | 2018-04-10 | [
[
"Pan",
"Supriya",
""
],
[
"Pal",
"Barun Kumar",
""
],
[
"Pramanik",
"Souvik",
""
]
] | In this work we focus on the gravitationally influenced adiabatic particle creation process, a mechanism that does not need any dark energy or modified gravity models to explain the current accelerating phase of the universe. Introducing some particle creation models that generalize some previous models in the literatu... |
2105.04329 | Lance Williams | L.L. Williams and N. Inan | Inductive rectilinear frame dragging and local coupling to the
gravitational field of the universe | 13 pages, 1 figure | Universe 2021, 7(8), 284 | 10.3390/universe7080284 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | There is a drag force on objects moving in the background cosmological
metric, known from galaxy cluster dynamics. The force is quite small over
laboratory timescales, yet it applies in principle to all moving bodies in the
universe. It means it is possible for matter to exchange momentum and energy
with the gravitat... | [
{
"created": "Mon, 10 May 2021 13:05:39 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jul 2021 04:23:30 GMT",
"version": "v2"
}
] | 2021-08-06 | [
[
"Williams",
"L. L.",
""
],
[
"Inan",
"N.",
""
]
] | There is a drag force on objects moving in the background cosmological metric, known from galaxy cluster dynamics. The force is quite small over laboratory timescales, yet it applies in principle to all moving bodies in the universe. It means it is possible for matter to exchange momentum and energy with the gravitatio... |
1912.10015 | Benjamin Elder | Benjamin Elder, Valeri Vardanyan, Yashar Akrami, Philippe Brax,
Anne-Christine Davis, and Ricardo S. Decca | The Classical Symmetron Force in Casimir Experiments | 16 pages, 8 figures | Phys. Rev. D 101, 064065 (2020) | 10.1103/PhysRevD.101.064065 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The symmetron is a typical example of screened modified gravity, wherein the
symmetron force is dynamically suppressed in dense environments. This allows it
to hide in traditional tests of gravity. However, the past decade has seen
great experimental progress towards measuring screened forces in the laboratory
or in ... | [
{
"created": "Fri, 20 Dec 2019 18:43:31 GMT",
"version": "v1"
}
] | 2020-04-01 | [
[
"Elder",
"Benjamin",
""
],
[
"Vardanyan",
"Valeri",
""
],
[
"Akrami",
"Yashar",
""
],
[
"Brax",
"Philippe",
""
],
[
"Davis",
"Anne-Christine",
""
],
[
"Decca",
"Ricardo S.",
""
]
] | The symmetron is a typical example of screened modified gravity, wherein the symmetron force is dynamically suppressed in dense environments. This allows it to hide in traditional tests of gravity. However, the past decade has seen great experimental progress towards measuring screened forces in the laboratory or in sp... |
0801.4001 | Martin Bojowald | Martin Bojowald | Quantum nature of cosmological bounces | 26 pages | Gen.Rel.Grav.40:2659-2683,2008 | 10.1007/s10714-008-0645-1 | IGC-08/1-3 | gr-qc astro-ph hep-th | null | Several examples are known where quantum gravity effects resolve the
classical big bang singularity by a bounce. The most detailed analysis has
probably occurred for loop quantum cosmology of isotropic models sourced by a
free, massless scalar. Once a bounce has been realized under fairly general
conditions, the cent... | [
{
"created": "Fri, 25 Jan 2008 17:59:45 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Bojowald",
"Martin",
""
]
] | Several examples are known where quantum gravity effects resolve the classical big bang singularity by a bounce. The most detailed analysis has probably occurred for loop quantum cosmology of isotropic models sourced by a free, massless scalar. Once a bounce has been realized under fairly general conditions, the centra... |
1802.08087 | Sergio Ulhoa | A. S. Fernandes, S. C. Ulhoa, R. G. G. Amorim | On Quantum Cosmology in Teleparallel Gravity | null | Journal of Physics: Conf. Series 965 (2018) 012014 | 10.1088/1742-6596/965/1/012014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A quantum cosmology in teleparallel gravity is presented in this article.
Teleparallel gravity is used to perform such an analysis once in General
Relativity (GR) the concept of gravitational energy is misleading preventing
the establishment of a concise quantum cosmology. The Wheeler-DeWitt like
equation is obtained... | [
{
"created": "Wed, 21 Feb 2018 18:59:31 GMT",
"version": "v1"
}
] | 2018-02-23 | [
[
"Fernandes",
"A. S.",
""
],
[
"Ulhoa",
"S. C.",
""
],
[
"Amorim",
"R. G. G.",
""
]
] | A quantum cosmology in teleparallel gravity is presented in this article. Teleparallel gravity is used to perform such an analysis once in General Relativity (GR) the concept of gravitational energy is misleading preventing the establishment of a concise quantum cosmology. The Wheeler-DeWitt like equation is obtained u... |
1601.07563 | Dejan Stojkovic | De-Chang Dai, Dejan Stojkovic | Maximal temperature in a simple thermodynamical system | Published in JCAP 1606 (2016) no.06, 040 | JCAP 1606 (2016) no.06, 040 | 10.1088/1475-7516/2016/06/040 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Temperature in a simple thermodynamical system is not limited from above. It
is also widely believed that it does not make sense talking about temperatures
higher than the Planck temperature in the absence of the full theory of quantum
gravity. Here, we demonstrate that there exist a maximal achievable temperature
in... | [
{
"created": "Wed, 27 Jan 2016 21:00:52 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jul 2016 21:49:31 GMT",
"version": "v2"
}
] | 2016-08-05 | [
[
"Dai",
"De-Chang",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | Temperature in a simple thermodynamical system is not limited from above. It is also widely believed that it does not make sense talking about temperatures higher than the Planck temperature in the absence of the full theory of quantum gravity. Here, we demonstrate that there exist a maximal achievable temperature in a... |
2209.03536 | Kelvin H. M. Chan | Kelvin H. M. Chan and Otto A. Hannuksela | Extracting ultralight boson properties from boson clouds around
post-merger remnants | 12 pages | null | null | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ultralight bosons are a class of hypothetical particles that could
potentially solve critical problems in fields ranging from cosmology to
astrophysics and fundamental physics. If ultralight bosons exist, they form
clouds around spinning black holes with sizes comparable to their particle
Compton wavelength through s... | [
{
"created": "Thu, 8 Sep 2022 02:35:27 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Sep 2022 00:49:07 GMT",
"version": "v2"
}
] | 2022-09-13 | [
[
"Chan",
"Kelvin H. M.",
""
],
[
"Hannuksela",
"Otto A.",
""
]
] | Ultralight bosons are a class of hypothetical particles that could potentially solve critical problems in fields ranging from cosmology to astrophysics and fundamental physics. If ultralight bosons exist, they form clouds around spinning black holes with sizes comparable to their particle Compton wavelength through sup... |
1406.0840 | Ghulam Abbas | G. Abbas, U. Sabiullah | Geodesic Study of Regular Hayward Black Hole | 14 pages, 7 figures. Accepted for publication in Astrophy. and Space
Sci. This paper is outcome of M.Sc. Thesis of Mr. Sabiullah Supervised by Dr.
Ghulam Abbas | Astrophys. Space Sci. 352(2014)769 | 10.1007/s10509-014-1992-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to study the geodesic structure of regular Hayward
black hole. The timelike and null geodesic have been studied explicitly for
radial and non-radial motion. For timelike and null geodesic in radial motion
there exists analytical solution, while for non-radial motion the effective
potential has b... | [
{
"created": "Tue, 3 Jun 2014 07:50:47 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Abbas",
"G.",
""
],
[
"Sabiullah",
"U.",
""
]
] | This paper is devoted to study the geodesic structure of regular Hayward black hole. The timelike and null geodesic have been studied explicitly for radial and non-radial motion. For timelike and null geodesic in radial motion there exists analytical solution, while for non-radial motion the effective potential has bee... |
2205.08707 | Vladimir Folomeev | Vladimir Dzhunushaliev, Vladimir Folomeev, and Nassurlla Burtebayev | Rapidly rotating Dirac stars | 12 pages, 4 figures, minor corrections to content, version published
in PRD | Phys. Rev. D 106, 024021 (2022) | 10.1103/PhysRevD.106.024021 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Within general relativity, we construct sequences of rapidly rotating Dirac
stars consisting of a spinor fluid described by an effective equation of state.
We find the physically relevant domain of stable configurations and calculate
their principal characteristics which are completely determined by the central
densi... | [
{
"created": "Wed, 18 May 2022 04:05:48 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2022 04:01:21 GMT",
"version": "v2"
}
] | 2022-07-15 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Folomeev",
"Vladimir",
""
],
[
"Burtebayev",
"Nassurlla",
""
]
] | Within general relativity, we construct sequences of rapidly rotating Dirac stars consisting of a spinor fluid described by an effective equation of state. We find the physically relevant domain of stable configurations and calculate their principal characteristics which are completely determined by the central density... |
1808.09202 | Giovanni Acquaviva | Giovanni Acquaviva, Aroonkumar Beesham | Dynamical analysis of a first order theory of bulk viscosity | 18 pages, 11 figures | null | 10.1088/1361-6382/aadb38 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a global analysis of curved Friedmann-Robertson-Walker cosmologies
in the presence of a viscous fluid. The fluid's bulk viscosity is governed by a
first order theory recently proposed in [M. M. Disconzi, T. W. Kephart, and R.
J. Scherrer, Phys. Rev. D 91, 043532 (2015)], and the analysis is carried out
in ... | [
{
"created": "Tue, 28 Aug 2018 09:57:21 GMT",
"version": "v1"
}
] | 2018-08-29 | [
[
"Acquaviva",
"Giovanni",
""
],
[
"Beesham",
"Aroonkumar",
""
]
] | We perform a global analysis of curved Friedmann-Robertson-Walker cosmologies in the presence of a viscous fluid. The fluid's bulk viscosity is governed by a first order theory recently proposed in [M. M. Disconzi, T. W. Kephart, and R. J. Scherrer, Phys. Rev. D 91, 043532 (2015)], and the analysis is carried out in a ... |
2307.01768 | Hussain Gohar | Hussain Gohar, Vincenzo Salzano | On the foundations of entropic cosmologies: inconsistencies, possible
solutions and dead end signs | 12 pages, added references and explanations | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this letter we explore the foundations of entropic cosmology and highlight
some important flaws which have emerged and adopted in the recent literature.
We argue that, when applying entropy and temperature on the cosmological
horizon by assuming the holographic principle for all thermodynamic approaches
to cosmolo... | [
{
"created": "Tue, 4 Jul 2023 15:15:43 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Jul 2023 00:56:00 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Mar 2024 14:00:09 GMT",
"version": "v3"
}
] | 2024-03-25 | [
[
"Gohar",
"Hussain",
""
],
[
"Salzano",
"Vincenzo",
""
]
] | In this letter we explore the foundations of entropic cosmology and highlight some important flaws which have emerged and adopted in the recent literature. We argue that, when applying entropy and temperature on the cosmological horizon by assuming the holographic principle for all thermodynamic approaches to cosmology... |
gr-qc/9712032 | S. Droz | Serge Droz and Eric Poisson | Can LIGO see compact binaries? | 4 Pages, Proc. to the 7th Canadian Conference on General Relativity
and Relativistic Astrophysics 1997 | null | null | null | gr-qc | null | The probability that interferometric detectors such as LIGO and VIRGO will
successfully detect inspiraling compact binaries depends in part on our
knowledge of the expected gravitational wave forms.
The best approximations to the true wave forms available today are the
post-Newtonian (PN) templates. In this paper w... | [
{
"created": "Fri, 5 Dec 1997 16:31:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Droz",
"Serge",
""
],
[
"Poisson",
"Eric",
""
]
] | The probability that interferometric detectors such as LIGO and VIRGO will successfully detect inspiraling compact binaries depends in part on our knowledge of the expected gravitational wave forms. The best approximations to the true wave forms available today are the post-Newtonian (PN) templates. In this paper we ar... |
2106.05991 | Carlos O. Lousto | Nicole Rosato, Hiroyuki Nakano, Carlos O. Lousto | Local and Approximate classification of spacetimes in the transverse
frames | 18 pages, 11 figures | Phys. Rev. D 104, 044047 (2021) | 10.1103/PhysRevD.104.044047 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the definition of transverse frames and tetrad choices with
regards to its application to numerically generated spacetimes, in particular
those from the merger of binary black holes. We introduce the concept of local
and approximate algebraic Petrov types in the strong field regime. We define an
index $\ma... | [
{
"created": "Thu, 10 Jun 2021 18:11:33 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Jul 2021 18:10:54 GMT",
"version": "v2"
}
] | 2021-08-25 | [
[
"Rosato",
"Nicole",
""
],
[
"Nakano",
"Hiroyuki",
""
],
[
"Lousto",
"Carlos O.",
""
]
] | We revisit the definition of transverse frames and tetrad choices with regards to its application to numerically generated spacetimes, in particular those from the merger of binary black holes. We introduce the concept of local and approximate algebraic Petrov types in the strong field regime. We define an index $\math... |
gr-qc/9411058 | Othmar Brodbeck | Othmar Brodbeck and Norbert Straumann | Instability Proof for Einstein-Yang-Mills Solitons and Black Holes with
Arbitrary Gauge Groups | 26 pages, LATEX, no figures | J.Math.Phys.37:1414-1433,1996 | 10.1063/1.531441 | ZU-TH 38/94 | gr-qc | null | We prove that static, spherically symmetric, asymptotically flat soliton and
black hole solutions of the Einstein-Yang-Mills equations are unstable for
arbitrary gauge groups, at least for the ``generic" case. This conclusion is
derived without explicit knowledge of the possible equilibrium solutions.
| [
{
"created": "Tue, 22 Nov 1994 13:07:30 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Brodbeck",
"Othmar",
""
],
[
"Straumann",
"Norbert",
""
]
] | We prove that static, spherically symmetric, asymptotically flat soliton and black hole solutions of the Einstein-Yang-Mills equations are unstable for arbitrary gauge groups, at least for the ``generic" case. This conclusion is derived without explicit knowledge of the possible equilibrium solutions. |
gr-qc/0004081 | Yuri N. Obukhov | Yuri N. Obukhov and Eugen J. Vlachynsky | Einstein--Proca model: spherically symmetric solutions | 20 p., Revtex, 3 Postscript figures | Ann.Phys.8:497-510,1999 | 10.1002/(SICI)1521-3889(199909)8:6<497::AID-ANDP497>3.0.CO;2-5 | null | gr-qc | null | The Proca wave equation describes a classical massive spin 1 particle. We
analyze the gravitational interaction of this vector field. In particular, the
spherically symmetric solutions of the Einstein-Proca coupled system are
obtained numerically. Although at infinity the metric field approaches the
usual Schwarzschi... | [
{
"created": "Fri, 28 Apr 2000 15:46:39 GMT",
"version": "v1"
}
] | 2017-09-27 | [
[
"Obukhov",
"Yuri N.",
""
],
[
"Vlachynsky",
"Eugen J.",
""
]
] | The Proca wave equation describes a classical massive spin 1 particle. We analyze the gravitational interaction of this vector field. In particular, the spherically symmetric solutions of the Einstein-Proca coupled system are obtained numerically. Although at infinity the metric field approaches the usual Schwarzschild... |
1211.2363 | Gabriel Pascu | Gabriel Pascu | Atlas of Coordinate Charts on de Sitter Spacetime | null | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The de Sitter manifold admits a wide variety of interesting
coordinatizations. The 'atlas' is a compilation of the coordinate charts
referenced throughout the literature, and is presented in the form of tables,
the starting point being the embedding in a higher-dimensional Minkowski
spacetime. The metric tensor and t... | [
{
"created": "Sun, 11 Nov 2012 01:08:56 GMT",
"version": "v1"
}
] | 2012-11-13 | [
[
"Pascu",
"Gabriel",
""
]
] | The de Sitter manifold admits a wide variety of interesting coordinatizations. The 'atlas' is a compilation of the coordinate charts referenced throughout the literature, and is presented in the form of tables, the starting point being the embedding in a higher-dimensional Minkowski spacetime. The metric tensor and the... |
gr-qc/9905040 | Hiroshi Umetsu | Hisao Suzuki, Eiichi Takasugi and Hiroshi Umetsu | Analytic Solutions of Teukolsky Equation in Kerr-de Sitter and
Kerr-Newman-de Sitter Geometries | 24 pages, LaTeX | Prog.Theor.Phys. 102 (1999) 253-272 | 10.1143/PTP.102.253 | EPHOU 99-007, OU-HET-319 | gr-qc | null | The analytic solution of Teukolsky equation in Kerr-de Sitter and
Kerr-Newman-de Sitter geometries is presented and the properties of the
solution are examined. In particular, we show that our solution satisfies the
Teukolsky-Starobinsky identities explicitly and fix the relative normalization
between solutions with ... | [
{
"created": "Thu, 13 May 1999 07:19:18 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Suzuki",
"Hisao",
""
],
[
"Takasugi",
"Eiichi",
""
],
[
"Umetsu",
"Hiroshi",
""
]
] | The analytic solution of Teukolsky equation in Kerr-de Sitter and Kerr-Newman-de Sitter geometries is presented and the properties of the solution are examined. In particular, we show that our solution satisfies the Teukolsky-Starobinsky identities explicitly and fix the relative normalization between solutions with th... |
1308.3502 | Hirotada Okawa | Hirotada Okawa | Initial Conditions for Numerical Relativity -- Introduction to numerical
methods for solving elliptic PDEs | Lecture notes from the NRHEP spring school held at IST-Lisbon, March
2013. Extra material and notebooks available online at
http://blackholes.ist.utl.pt/nrhep2/ To be published by IJMPA (V. Cardoso, L.
Gualtieri, C. Herdeiro and U. Sperhake, Eds., 2013) | null | 10.1142/S0217751X13400162 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerical relativity became a powerful tool to investigate the dynamics of
binary problems with black holes or neutron stars as well as the very structure
of General Relativity. Although public numerical relativity codes are available
to evolve such systems, a proper understanding of the methods involved is quite
imp... | [
{
"created": "Thu, 15 Aug 2013 20:14:33 GMT",
"version": "v1"
}
] | 2015-06-16 | [
[
"Okawa",
"Hirotada",
""
]
] | Numerical relativity became a powerful tool to investigate the dynamics of binary problems with black holes or neutron stars as well as the very structure of General Relativity. Although public numerical relativity codes are available to evolve such systems, a proper understanding of the methods involved is quite impor... |
2209.04347 | Eleni-Alexandra Kontou | Melanie Graf, Eleni-Alexandra Kontou, Argam Ohanyan, Benedict
Schinnerl | Hawking-type singularity theorems for worldvolume energy inequalities | 30 pages | null | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The classical singularity theorems of R. Penrose and S. Hawking from the
1960s show that, given a pointwise energy condition (and some causality as well
as initial assumptions), spacetimes cannot be geodesically complete. Despite
their great success, the theorems leave room for physically relevant
improvements, espec... | [
{
"created": "Fri, 9 Sep 2022 15:19:26 GMT",
"version": "v1"
}
] | 2022-09-12 | [
[
"Graf",
"Melanie",
""
],
[
"Kontou",
"Eleni-Alexandra",
""
],
[
"Ohanyan",
"Argam",
""
],
[
"Schinnerl",
"Benedict",
""
]
] | The classical singularity theorems of R. Penrose and S. Hawking from the 1960s show that, given a pointwise energy condition (and some causality as well as initial assumptions), spacetimes cannot be geodesically complete. Despite their great success, the theorems leave room for physically relevant improvements, especia... |
2106.00491 | Pardyumn Kumar Sahoo | Simran Arora, S. K. J. Pacif, Abhishek Parida, P.K. Sahoo | Bulk viscous matter and the cosmic acceleration of the universe in
$f(Q,T)$ gravity | Revised version | Journal of High Energy Astrophysics, 33 (2022) 1-9 | 10.1016/j.jheap.2021.10.001 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We have studied bulk viscosity in the modified $f(Q, T)$ gravity theory
formalism, where $Q$ represents the non-metricity and $T$ denotes the trace of
energy-momentum tensor within a flat Friedmann-Lema\^{i}tre-Robertson-Walker
metric (FLRW). Here, we have explicitly considered the effective equation of
state, which ... | [
{
"created": "Mon, 31 May 2021 06:03:56 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Aug 2021 04:23:13 GMT",
"version": "v2"
},
{
"created": "Mon, 11 Oct 2021 07:43:49 GMT",
"version": "v3"
}
] | 2021-12-01 | [
[
"Arora",
"Simran",
""
],
[
"Pacif",
"S. K. J.",
""
],
[
"Parida",
"Abhishek",
""
],
[
"Sahoo",
"P. K.",
""
]
] | We have studied bulk viscosity in the modified $f(Q, T)$ gravity theory formalism, where $Q$ represents the non-metricity and $T$ denotes the trace of energy-momentum tensor within a flat Friedmann-Lema\^{i}tre-Robertson-Walker metric (FLRW). Here, we have explicitly considered the effective equation of state, which in... |
1602.08220 | Crucean Cosmin | Cosmin Crucean and Mihaela-Andreea Baloi | Fermion production in a magnetic field in a de Sitter Universe | 28 pages, 20 figures | Phys. Rev. D 93, 044070 (2016) | 10.1103/PhysRevD.93.044070 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The process of fermion production in the field of a magnetic dipole on a de
Sitter expanding universe is analyzed. The amplitude and probability for
production of massive fermions are obtained using the exact solution of the
Dirac equation written in the momentum-helicity basis. We found that the most
probable transi... | [
{
"created": "Fri, 26 Feb 2016 07:23:37 GMT",
"version": "v1"
}
] | 2016-02-29 | [
[
"Crucean",
"Cosmin",
""
],
[
"Baloi",
"Mihaela-Andreea",
""
]
] | The process of fermion production in the field of a magnetic dipole on a de Sitter expanding universe is analyzed. The amplitude and probability for production of massive fermions are obtained using the exact solution of the Dirac equation written in the momentum-helicity basis. We found that the most probable transiti... |
gr-qc/9804030 | Helia Hollmann | P. Breitenlohner (Munich, Max Planck Inst.), H. Hollmann (Cambridge,
DAMTP), D. Maison (Munich, Max Planck Inst.) | Quantization of the Reissner-Nordstr\"{o}m Black Hole | 8 pages, Latex | Phys.Lett. B432 (1998) 293-297 | 10.1016/S0370-2693(98)00663-7 | DAMTP-R-98-12 | gr-qc | null | The Reissner--Nordstr\"{o}m family of solutions can be understood to arise
from the spherically symmetric sector of a nonlinear SO(2,1)/SO(1,1) sigma
model coupled to three dimensional Euclidean gravity. In this context a group
theoretical quantization is performed. We identify the observables of the
theory and calcu... | [
{
"created": "Fri, 10 Apr 1998 15:05:02 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Breitenlohner",
"P.",
"",
"Munich, Max Planck Inst."
],
[
"Hollmann",
"H.",
"",
"Cambridge,\n DAMTP"
],
[
"Maison",
"D.",
"",
"Munich, Max Planck Inst."
]
] | The Reissner--Nordstr\"{o}m family of solutions can be understood to arise from the spherically symmetric sector of a nonlinear SO(2,1)/SO(1,1) sigma model coupled to three dimensional Euclidean gravity. In this context a group theoretical quantization is performed. We identify the observables of the theory and calcula... |
0911.1452 | Antonio Feoli | A. Feoli | The amplitude of the gravitational de Broglie waves | null | Mod.Phys.Lett.A24:2497-2505,2009 | 10.1142/S0217732309031685 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the amplitude of the de Broglie gravitational waves using the
standard Einstein General Relativity. We find that these waves disappear in the
limit $\hbar \to 0$ and when their source has a large mass and volume. From the
experimental point of view, the knowledge of the amplitude allows to estimate
the m... | [
{
"created": "Sat, 7 Nov 2009 19:24:24 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Feoli",
"A.",
""
]
] | We calculate the amplitude of the de Broglie gravitational waves using the standard Einstein General Relativity. We find that these waves disappear in the limit $\hbar \to 0$ and when their source has a large mass and volume. From the experimental point of view, the knowledge of the amplitude allows to estimate the mag... |
gr-qc/9810020 | Luis Herrera | L. Herrera, A. Di Prisco | The Active Gravitational Mass of a Heat Conducting Sphere Out of
Hydrostatic Equilibrium | To appear in General Relativity and Gravitation | Gen.Rel.Grav.31:301-313,1999 | 10.1023/A:1026684409560 | null | gr-qc astro-ph | null | We obtain an expression for the active gravitational mass of a relativistic
heat conducting fluid, just after its departure from hydrostatic equilibrium,
on a time scale of the order of relaxation time. It is shown that an increase
of a characteristic parameter leads to larger (smaller) values of active
gravitational... | [
{
"created": "Tue, 6 Oct 1998 03:20:03 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Herrera",
"L.",
""
],
[
"Di Prisco",
"A.",
""
]
] | We obtain an expression for the active gravitational mass of a relativistic heat conducting fluid, just after its departure from hydrostatic equilibrium, on a time scale of the order of relaxation time. It is shown that an increase of a characteristic parameter leads to larger (smaller) values of active gravitational m... |
gr-qc/9302029 | null | B. L. Hu and Yuhong Zhang | Quantum and Thermal Fluctuations, Uncertainty Principle, Decoherence and
Classicality* | umdpp 93-58, 19 pages, latex. Invited Talk delivered by B. L. Hu at
the Third Workshop on Quantum Nonintegrability, Drexel University,
Philadelphia, May, 1992. To appear in {\it Quantum Dynamics of Chaotic
Systems}, edited by J. M. Yuan, D. H. Feng and G. M. Zaslavsky (Gordon and
Breach, Langhorne 1993) | null | null | null | gr-qc | null | We scrutize the commonly used criteria for classicality and examine their
underlying issues. The two major issues we address here are that of decoherence
and fluctuations. We borrow the insights gained in the study of the
semiclassical limit of quantum cosmology to discuss the three criteria of
classicality for a qua... | [
{
"created": "Mon, 22 Feb 1993 18:19:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hu",
"B. L.",
""
],
[
"Zhang",
"Yuhong",
""
]
] | We scrutize the commonly used criteria for classicality and examine their underlying issues. The two major issues we address here are that of decoherence and fluctuations. We borrow the insights gained in the study of the semiclassical limit of quantum cosmology to discuss the three criteria of classicality for a quant... |
2106.14966 | Konstantinos Dimopoulos | Konstantinos Dimopoulos | Jointly modelling Cosmic Inflation and Dark Energy | 9 pages, 3 figures. Contribution to Proceedings of HEP 2021 | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quintessential inflation utilises a single scalar field to account for the
observations of both cosmic inflation and dark energy. The requirements for
modelling quintessential inflation are described and two explicit successful
models are presented in the context of $\alpha$-attractors and Palatini
modified gravity.
| [
{
"created": "Mon, 28 Jun 2021 20:05:28 GMT",
"version": "v1"
}
] | 2021-06-30 | [
[
"Dimopoulos",
"Konstantinos",
""
]
] | Quintessential inflation utilises a single scalar field to account for the observations of both cosmic inflation and dark energy. The requirements for modelling quintessential inflation are described and two explicit successful models are presented in the context of $\alpha$-attractors and Palatini modified gravity. |
2205.08026 | Deng Wang | Deng Wang | Shaving the Hair of Black Hole with Sagittarius A$^*$ from Event Horizon
Telescope | 4.5 pages, 1 figure | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the Event Horizon Telescope collaboration has reported the first
image of the supermassive black hole Sagittarius in the Galactic Center. We
attempt to test the validity of the no-hair theorem of black holes using this
new shadow observation. Considering the Einstein-Maxwell-klein-Gordon theory
with a minim... | [
{
"created": "Mon, 16 May 2022 23:56:30 GMT",
"version": "v1"
}
] | 2022-05-18 | [
[
"Wang",
"Deng",
""
]
] | Recently, the Event Horizon Telescope collaboration has reported the first image of the supermassive black hole Sagittarius in the Galactic Center. We attempt to test the validity of the no-hair theorem of black holes using this new shadow observation. Considering the Einstein-Maxwell-klein-Gordon theory with a minimal... |
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