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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2010.10400 | Adele Naddeo | Sergio De Filippo, Adele Naddeo | Microscopic foundation of thermodynamics, transition to classicality and
regularization of gravitational-collapse singularities within Non-unitary
$4$-th Derivative Gravity classically equivalent to Einstein gravity and its
Newtonian limit | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A detailed and updated review is given of De Filippo's Non-unitary $4$-th
Derivative Gravity and its Newtonian limit, by pointing out the crucial role of
non-unitarity in addressing transition to classicality and specifically
localization of macroscopic bodies, microscopic foundation of the second law of
thermodynami... | [
{
"created": "Tue, 20 Oct 2020 16:06:04 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Nov 2020 16:29:03 GMT",
"version": "v2"
}
] | 2020-11-06 | [
[
"De Filippo",
"Sergio",
""
],
[
"Naddeo",
"Adele",
""
]
] | A detailed and updated review is given of De Filippo's Non-unitary $4$-th Derivative Gravity and its Newtonian limit, by pointing out the crucial role of non-unitarity in addressing transition to classicality and specifically localization of macroscopic bodies, microscopic foundation of the second law of thermodynamics... |
1808.08653 | J\"org Frauendiener | J\"org Frauendiener | Gravitational waves and the Sagnac effect | 5 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Light propagating in opposite directions around the same loop in general
shows a relative phase shift when recombined. This phenomenon is known as the
Sagnac effect after Georges Sagnac who, in 1913, demonstrated with an
interferometer on a rotating table that the phase shift depended on the angular
velocity of the t... | [
{
"created": "Mon, 27 Aug 2018 01:24:22 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jun 2019 05:02:19 GMT",
"version": "v2"
}
] | 2019-06-05 | [
[
"Frauendiener",
"Jörg",
""
]
] | Light propagating in opposite directions around the same loop in general shows a relative phase shift when recombined. This phenomenon is known as the Sagnac effect after Georges Sagnac who, in 1913, demonstrated with an interferometer on a rotating table that the phase shift depended on the angular velocity of the tab... |
2111.03675 | Rossella Gamba | Rossella Gamba, Sarp Ak\c{c}ay, Sebastiano Bernuzzi and Jake Williams | Effective-one-body waveforms for precessing coalescing compact binaries
with post-newtonian Twist | 21 pages, 20 figures. Accepted in PRD | null | 10.1103/PhysRevD.106.024020 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin precession is a generic feature of compact binary coalescences, which
leaves clear imprints in the gravitational waveforms. Building on previous
work, we present an efficient time domain inspiral-merger-ringdown
effective-one-body model (EOB) for precessing binary black holes, which
incorporates subdominant mode... | [
{
"created": "Fri, 5 Nov 2021 18:00:05 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jul 2022 13:33:00 GMT",
"version": "v2"
}
] | 2022-07-27 | [
[
"Gamba",
"Rossella",
""
],
[
"Akçay",
"Sarp",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Williams",
"Jake",
""
]
] | Spin precession is a generic feature of compact binary coalescences, which leaves clear imprints in the gravitational waveforms. Building on previous work, we present an efficient time domain inspiral-merger-ringdown effective-one-body model (EOB) for precessing binary black holes, which incorporates subdominant modes ... |
2212.10038 | Riccardo Buscicchio | Matteo Ballelli and Riccardo Buscicchio and Barbara Patricelli and
Anirban Ain and Giancarlo Cella | Improved detection statistics for non Gaussian gravitational wave
stochastic backgrounds | 12 pages, 5 figures (published on 23 June 2023) | Phys.Rev.D 107, 124044 (2023) Volume 107, Issue 12 | 10.1103/PhysRevD.107.124044 | null | gr-qc astro-ph.CO astro-ph.HE | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In a recent paper we described a novel approach to the detection and
parameter estimation of a non-Gaussian stochastic background of gravitational
waves. In this work we propose an improved version of the detection procedure,
preserving robustness against imperfect noise knowledge at no cost of detection
performance:... | [
{
"created": "Tue, 20 Dec 2022 07:18:57 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Aug 2023 21:51:39 GMT",
"version": "v2"
}
] | 2023-08-22 | [
[
"Ballelli",
"Matteo",
""
],
[
"Buscicchio",
"Riccardo",
""
],
[
"Patricelli",
"Barbara",
""
],
[
"Ain",
"Anirban",
""
],
[
"Cella",
"Giancarlo",
""
]
] | In a recent paper we described a novel approach to the detection and parameter estimation of a non-Gaussian stochastic background of gravitational waves. In this work we propose an improved version of the detection procedure, preserving robustness against imperfect noise knowledge at no cost of detection performance: i... |
0712.1933 | Miguel S\'anchez | Miguel S\'anchez | Recent progress on the notion of global hyperbolicity | 18 pages, 1 figure. Extended and updated contribution to the meeting
"New Developments in Lorentzian Geometry" Berlin, Nov. 2009 | null | 10.1051/eas:0830026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Global hyperbolicity is a central concept in Mathematical Relativity. Here,
we review the different approaches to this concept explaining both, classical
approaches and recent results. The former includes Cauchy hypersurfaces, naked
singularities, and the space of the causal curves connecting two events. The
latter i... | [
{
"created": "Wed, 12 Dec 2007 13:34:41 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Feb 2010 10:47:25 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Sánchez",
"Miguel",
""
]
] | Global hyperbolicity is a central concept in Mathematical Relativity. Here, we review the different approaches to this concept explaining both, classical approaches and recent results. The former includes Cauchy hypersurfaces, naked singularities, and the space of the causal curves connecting two events. The latter inc... |
gr-qc/0102096 | J. Frauendiener | Joerg Frauendiener and Christian Klein | Exact relativistic treatment of stationary counter-rotating dust disks
III. Physical Properties | 30 pages, 20 figures; to appear in Phys. Rev. D | Phys.Rev. D63 (2001) 084025 | 10.1103/PhysRevD.63.084025 | null | gr-qc | null | This is the third in a series of papers on the construction of explicit
solutions to the stationary axisymmetric Einstein equations which can be
interpreted as counter-rotating disks of dust. We discuss the physical
properties of a class of solutions to the Einstein equations for disks with
constant angular velocity ... | [
{
"created": "Thu, 22 Feb 2001 08:43:28 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Frauendiener",
"Joerg",
""
],
[
"Klein",
"Christian",
""
]
] | This is the third in a series of papers on the construction of explicit solutions to the stationary axisymmetric Einstein equations which can be interpreted as counter-rotating disks of dust. We discuss the physical properties of a class of solutions to the Einstein equations for disks with constant angular velocity an... |
1906.06990 | Ernesto Contreras | Ernesto Contreras, \'Angel Rinc\'on, Grigoris Panotopoulos, Pedro
Bargue\~no and Benjamin Koch | Black hole shadow of a rotating scale--dependent black hole | Accepted version. arXiv admin note: text overlap with
arXiv:1905.11443 | Phys. Rev. D 101, 064053 (2020) | 10.1103/PhysRevD.101.064053 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, starting from a spherically symmetric scale--dependent black
hole, a rotating solution is obtained by following the Newman--Janis algorithm
without complexification. Besides studying the horizon, the static conditions
and causality issues of the rotating solution, we get and discuss the shape of
its sha... | [
{
"created": "Mon, 17 Jun 2019 12:33:26 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jun 2019 01:43:26 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Jun 2019 16:58:56 GMT",
"version": "v3"
},
{
"created": "Sun, 29 Mar 2020 02:49:40 GMT",
"version": "v4"
}
] | 2020-04-01 | [
[
"Contreras",
"Ernesto",
""
],
[
"Rincón",
"Ángel",
""
],
[
"Panotopoulos",
"Grigoris",
""
],
[
"Bargueño",
"Pedro",
""
],
[
"Koch",
"Benjamin",
""
]
] | In this work, starting from a spherically symmetric scale--dependent black hole, a rotating solution is obtained by following the Newman--Janis algorithm without complexification. Besides studying the horizon, the static conditions and causality issues of the rotating solution, we get and discuss the shape of its shado... |
2311.18708 | Muhammad Sharif | M. Sharif and K. Hassan | Study of Charged Celestial Objects in Modified Gravity | 33 figures, 7 figures | Chinese J. Phys. 86(2023)227-241 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we assess different charged self-gravitating stellar models
possessing anisotropic matter source in the background of $f(G,T)$ gravity. For
this purpose, we choose a well-known model of this gravity, i.e.,
$f(G,T)=G^2+\varrho T$, where $\varrho$ stands for the coupling constant. The
modified field equa... | [
{
"created": "Sat, 11 Nov 2023 12:37:19 GMT",
"version": "v1"
}
] | 2023-12-01 | [
[
"Sharif",
"M.",
""
],
[
"Hassan",
"K.",
""
]
] | In this paper, we assess different charged self-gravitating stellar models possessing anisotropic matter source in the background of $f(G,T)$ gravity. For this purpose, we choose a well-known model of this gravity, i.e., $f(G,T)=G^2+\varrho T$, where $\varrho$ stands for the coupling constant. The modified field equati... |
2203.02409 | Bianca Dittrich | Bianca Dittrich, Athanasios Kogios | From spin foams to area metric dynamics to gravitons | 27 pages, ancillary Mathematica notebook | null | 10.1088/1361-6382/acc5d9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although spin foams arose as quantizations of the length metric degrees of
freedom, the quantum configuration space is rather based on areas as more
fundamental variables. This is also highlighted by the semi-classical limit of
four-dimensional spin foam models, which is described by the Area Regge action.
Despite it... | [
{
"created": "Fri, 4 Mar 2022 16:23:59 GMT",
"version": "v1"
}
] | 2023-04-26 | [
[
"Dittrich",
"Bianca",
""
],
[
"Kogios",
"Athanasios",
""
]
] | Although spin foams arose as quantizations of the length metric degrees of freedom, the quantum configuration space is rather based on areas as more fundamental variables. This is also highlighted by the semi-classical limit of four-dimensional spin foam models, which is described by the Area Regge action. Despite its ... |
1303.6945 | Ghulam Abbas | G. Abbas | Phantom energy accretion onto a black hole in Horava Lifshitz gravity | 8 pages, 1 table, 1 figure, Accepted for Publication in Science China
Physics, Mechanics and Astronomy | Sci. China-Phys. Mech. Astron. 57(2014)604 | 10.1007/s11433-013-5306-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this Letter, we examine the phantom energy accretion onto a
Kehagias-Sfetsos black hole in Ho$\check{r}$ava Lifshitz gravity. To discuss
the accretion process onto the black hole, the equations of phantom flow near
the black hole have been derived. It is found that mass of the black hole
decreases because of phant... | [
{
"created": "Wed, 27 Mar 2013 06:34:00 GMT",
"version": "v1"
}
] | 2014-03-11 | [
[
"Abbas",
"G.",
""
]
] | In this Letter, we examine the phantom energy accretion onto a Kehagias-Sfetsos black hole in Ho$\check{r}$ava Lifshitz gravity. To discuss the accretion process onto the black hole, the equations of phantom flow near the black hole have been derived. It is found that mass of the black hole decreases because of phantom... |
gr-qc/9906074 | Ms. Amita Shaw | S.Biswas, A.Shaw and D.Biswas | Starobinsky Model in Schroedinger Description | 19 Pages, LaTeX, no figure, gross typographical mistakes | null | 10.1007/s12043-999-0115-7 | null | gr-qc | null | In the Starobinsky inflationary model inflation is driven by quantum
corrections to the vacuum Einstein equation. We reduce the Wheeler-DeWitt
equation corresponding to the Starobinsky model to a Schroedinger form
containing time. The Schroedinger equation is solved with a Gaussian ansatz.
Using the prescription for ... | [
{
"created": "Thu, 17 Jun 1999 11:41:13 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Jun 1999 09:18:08 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Biswas",
"S.",
""
],
[
"Shaw",
"A.",
""
],
[
"Biswas",
"D.",
""
]
] | In the Starobinsky inflationary model inflation is driven by quantum corrections to the vacuum Einstein equation. We reduce the Wheeler-DeWitt equation corresponding to the Starobinsky model to a Schroedinger form containing time. The Schroedinger equation is solved with a Gaussian ansatz. Using the prescription for th... |
1502.02021 | Kyriaki Dionysopoulou | K. Dionysopoulou, D. Alic, L. Rezzolla | General-relativistic resistive-magnetohydrodynamic simulations of binary
neutron stars | 26 pages, 17 figures; animations available at
http://www.southampton.ac.uk/~kd10g13/movies/index.shtml | Phys. Rev. D 92, 084064 (2015) | 10.1103/PhysRevD.92.084064 | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied the dynamics of an equal-mass magnetized neutron-star binary
within a resistive magnetohydrodynamic (RMHD) approach in which the highly
conducting stellar interior is matched to an electrovacuum exterior. Because
our analysis is aimed at assessing the modifications introduced by resistive
effects on t... | [
{
"created": "Fri, 6 Feb 2015 20:50:29 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Nov 2015 00:17:44 GMT",
"version": "v2"
}
] | 2015-11-12 | [
[
"Dionysopoulou",
"K.",
""
],
[
"Alic",
"D.",
""
],
[
"Rezzolla",
"L.",
""
]
] | We have studied the dynamics of an equal-mass magnetized neutron-star binary within a resistive magnetohydrodynamic (RMHD) approach in which the highly conducting stellar interior is matched to an electrovacuum exterior. Because our analysis is aimed at assessing the modifications introduced by resistive effects on the... |
1406.1147 | Jan Harms | Michael Coughlin and Jan Harms | Constraining the gravitational wave energy density of the Universe using
Earth's ring | 18 pages, 6 figures | Phys. Rev. D 90, 042005 (2014) | 10.1103/PhysRevD.90.042005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The search for gravitational waves is one of today's major scientific
endeavors. A gravitational wave can interact with matter by exciting vibrations
of elastic bodies. Earth itself is a large elastic body whose so-called
normal-mode oscillations ring up when a gravitational wave passes. Therefore,
precise measuremen... | [
{
"created": "Wed, 4 Jun 2014 19:04:48 GMT",
"version": "v1"
}
] | 2014-09-05 | [
[
"Coughlin",
"Michael",
""
],
[
"Harms",
"Jan",
""
]
] | The search for gravitational waves is one of today's major scientific endeavors. A gravitational wave can interact with matter by exciting vibrations of elastic bodies. Earth itself is a large elastic body whose so-called normal-mode oscillations ring up when a gravitational wave passes. Therefore, precise measurement ... |
gr-qc/0310072 | A. I. Nikishov | A.I.Nikishov | On the problem of uniqueness of energy-momentum tensor of gravitational
field | 7 pages, LATEX 2e, no figures | null | null | null | gr-qc | null | For an island-like distribution of matter the gravitational energy-momentum
tensor is defined according to Weinberg as a source of metric. If this source
is formed by self-interactions of gravitons, so that nonphysical degrees of
freedom are excluded, then this source is a reasonable candidate for the
energy-momentum... | [
{
"created": "Tue, 14 Oct 2003 14:32:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nikishov",
"A. I.",
""
]
] | For an island-like distribution of matter the gravitational energy-momentum tensor is defined according to Weinberg as a source of metric. If this source is formed by self-interactions of gravitons, so that nonphysical degrees of freedom are excluded, then this source is a reasonable candidate for the energy-momentum t... |
gr-qc/0309040 | Arbab Ibrahim Arbab | Arbab I. Arbab | Quantization of Gravitational System and its Cosmological Consequences | To appear in Gen. Relativ. Gravit., 39, 2004, (17 pages of LateX) | Gen.Rel.Grav.36:2465-2479,2004 | 10.1023/B:GERG.0000046833.08113.6b | null | gr-qc | null | We have found that the hierarchial problems appearing in cosmology is a
manifestation of the quantum nature of the universe. The universe is still
described by the same formulae that once hold at Planck's time. The universe is
found to be governed by the Machian equation, $G M=Rc^2$, where $M$ and $R$ are
mass and ra... | [
{
"created": "Sun, 7 Sep 2003 16:33:35 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Jan 2004 12:09:14 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Arbab",
"Arbab I.",
""
]
] | We have found that the hierarchial problems appearing in cosmology is a manifestation of the quantum nature of the universe. The universe is still described by the same formulae that once hold at Planck's time. The universe is found to be governed by the Machian equation, $G M=Rc^2$, where $M$ and $R$ are mass and radi... |
1110.6735 | Hideyoshi Arakida | Hideyoshi Arakida, Masumi Kasai | Effect of the cosmological constant on the bending of light and the
cosmological lens equation | Revised version accepted for publication in Physical Review D. 5
pages including 3 figures and 4 references are added | Phys. Rev. D 85, 023006 (2012) [4 pages] | 10.1103/PhysRevD.85.023006 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the effect of cosmological constant $\Lambda$ on the light
deflection and its role in the cosmological lens equation. First, we re-examine
the motion of photon in the Schwarzschild spacetime, and explicitly describe
the trajectory of photon and deflection angle $\alpha$ up to the second-order
in $G$. Then ... | [
{
"created": "Mon, 31 Oct 2011 10:01:18 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Dec 2011 04:41:44 GMT",
"version": "v2"
},
{
"created": "Fri, 23 Dec 2011 00:46:40 GMT",
"version": "v3"
},
{
"created": "Thu, 19 Jan 2012 08:11:12 GMT",
"version": "v4"
}
] | 2012-02-06 | [
[
"Arakida",
"Hideyoshi",
""
],
[
"Kasai",
"Masumi",
""
]
] | We revisit the effect of cosmological constant $\Lambda$ on the light deflection and its role in the cosmological lens equation. First, we re-examine the motion of photon in the Schwarzschild spacetime, and explicitly describe the trajectory of photon and deflection angle $\alpha$ up to the second-order in $G$. Then th... |
gr-qc/0002014 | Fodor | Michael Bradley, Gyula Fodor and Zolt\'an Perj\'es | A slowly rotating perfect fluid body in an ambient vacuum | 7 pages, published version | Class.Quant.Grav. 17 (2000) 2635-2640 | 10.1088/0264-9381/17/14/303 | null | gr-qc | null | A global model of a slowly rotating perfect fluid ball in general relativity
is presented. To second order in the rotation parameter, the junction surface
is an ellipsoidal cylinder. The interior is given by a limiting case of the
Wahlquist solution, and the vacuum region is not asymptotically flat. The
impossibility... | [
{
"created": "Thu, 3 Feb 2000 04:15:15 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Jun 2000 01:24:27 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Bradley",
"Michael",
""
],
[
"Fodor",
"Gyula",
""
],
[
"Perjés",
"Zoltán",
""
]
] | A global model of a slowly rotating perfect fluid ball in general relativity is presented. To second order in the rotation parameter, the junction surface is an ellipsoidal cylinder. The interior is given by a limiting case of the Wahlquist solution, and the vacuum region is not asymptotically flat. The impossibility o... |
2207.10394 | Nur Jaman | Miguel Correa, Mayukh R. Gangopadhyay, Nur Jaman and Grant J. Mathews | Primordial Black-Hole Dark Matter via Warm Natural Inflation | 6 pages, 2 figures, Minor corrections added. Figure is modified to
incorporate cold inflationary power spectrum. Published in PLB | Physics Letters B 835 (2022) 137510 | 10.1016/j.physletb.2022.137510 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on a study of the natural warm inflationary paradigm (WNI). We show
two important new results arise in this model. One is that the observational
constraints on the primordial power spectrum from the cosmic microwave
background (CMB) can be satisfied without going beyond the Planck scale of the
effective fie... | [
{
"created": "Thu, 21 Jul 2022 10:11:03 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Oct 2022 13:09:33 GMT",
"version": "v2"
}
] | 2022-10-26 | [
[
"Correa",
"Miguel",
""
],
[
"Gangopadhyay",
"Mayukh R.",
""
],
[
"Jaman",
"Nur",
""
],
[
"Mathews",
"Grant J.",
""
]
] | We report on a study of the natural warm inflationary paradigm (WNI). We show two important new results arise in this model. One is that the observational constraints on the primordial power spectrum from the cosmic microwave background (CMB) can be satisfied without going beyond the Planck scale of the effective field... |
1501.00391 | Saeed Rastgoo | Manfred Requardt, Saeed Rastgoo | The Structurally Dynamic Cellular Network and Quantum Graphity
Approaches to Quantum Gravity and Quantum Geometry - A Review and Comparison | 30 pages, 2 tables, minor changes in the title, abstract,
introduction and few places in the text body. Accepted and to appear in the
Journal of Cellular Automata | Journal of Cellular Automata 10/2015; 10(5-6):341-392 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from the working hypothesis that both physics and the corresponding
mathematics and in particular geometry have to be described by means of
discrete concepts on the Planck-scale, one of the many problems one has to face
in this enterprise is to find the discrete protoforms of the building blocks of
our ordin... | [
{
"created": "Fri, 2 Jan 2015 12:36:57 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jun 2015 23:44:44 GMT",
"version": "v2"
}
] | 2015-11-11 | [
[
"Requardt",
"Manfred",
""
],
[
"Rastgoo",
"Saeed",
""
]
] | Starting from the working hypothesis that both physics and the corresponding mathematics and in particular geometry have to be described by means of discrete concepts on the Planck-scale, one of the many problems one has to face in this enterprise is to find the discrete protoforms of the building blocks of our ordinar... |
gr-qc/0503071 | Ulrich Sperhake | U.Sperhake (1), B.Kelly (1 and 2), P.Laguna (1), K.L.Smith (1),
E.Schnetter (3) ((1) PSU, (2) UTB, (3) AEI) | Black hole head-on collisions and gravitational waves with fixed
mesh-refinement and dynamic singularity excision | Revised version, 1 figure added, accepted for publication in
Phys.Rev.D, 15 pages, 10 figures, revtex 4.0 | Phys.Rev.D71:124042,2005 | 10.1103/PhysRevD.71.124042 | null | gr-qc astro-ph | null | We present long-term-stable and convergent evolutions of head-on black hole
collisions and extraction of gravitational waves generated during the merger
and subsequent ring-down. The new ingredients in this work are the use of fixed
mesh-refinement and dynamical singularity excision techniques. We are able to
carry o... | [
{
"created": "Wed, 16 Mar 2005 20:38:22 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2005 21:17:44 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Sperhake",
"U.",
"",
"PSU"
],
[
"Kelly",
"B.",
"",
"1 and 2"
],
[
"Laguna",
"P.",
"",
"PSU"
],
[
"Smith",
"K. L.",
"",
"PSU"
],
[
"Schnetter",
"E.",
"",
"AEI"
]
] | We present long-term-stable and convergent evolutions of head-on black hole collisions and extraction of gravitational waves generated during the merger and subsequent ring-down. The new ingredients in this work are the use of fixed mesh-refinement and dynamical singularity excision techniques. We are able to carry out... |
gr-qc/9510046 | Anton K. Rebhan | Herbert Nachbagauer, Anton K. Rebhan, Dominik J. Schwarz | The dynamics of cosmological perturbations in thermal $\lambda\phi^4$
theory | 32 pages, REVTEX, 13 postscript figures included by epsf.sty | Phys.Rev. D53 (1996) 5468-5482 | 10.1103/PhysRevD.53.5468 | DESY 95-191, ENSLAPP-A-547-95, TUW-95-19 | gr-qc astro-ph hep-ph hep-th | null | Using a recent thermal-field-theory approach to cosmological perturbations,
the exact solutions that were found for collisionless ultrarelativistic matter
are generalized to include the effects from weak self-interactions in a
$\lambda\phi^4$ model through order $\lambda^{3/2}$. This includes the effects
of a resumma... | [
{
"created": "Mon, 23 Oct 1995 18:59:59 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Nachbagauer",
"Herbert",
""
],
[
"Rebhan",
"Anton K.",
""
],
[
"Schwarz",
"Dominik J.",
""
]
] | Using a recent thermal-field-theory approach to cosmological perturbations, the exact solutions that were found for collisionless ultrarelativistic matter are generalized to include the effects from weak self-interactions in a $\lambda\phi^4$ model through order $\lambda^{3/2}$. This includes the effects of a resummati... |
2106.00900 | Yousef Izadi | Amin Rezaei Akbarieh, Mohammad Ahmadi, Yousef Izadi, Shahabeddin M.
Aslmarand and Warner A. Miller | Evolution of spherical overdensity in Chaplygin gas model | null | Eur.Phys.J. C80, 391 (2020) | 10.1140/epjc/s10052-020-7960-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Even though many scalar field models of dark energy have been considered in
the literature, there is another interesting class of dark energy models
involving a fluid known as a Chaplygin gas. In addition to describing the dark
energy, both scalar-tensor model and the Chaplygin gas model are suitable
candidates for e... | [
{
"created": "Wed, 2 Jun 2021 02:36:21 GMT",
"version": "v1"
}
] | 2021-06-14 | [
[
"Akbarieh",
"Amin Rezaei",
""
],
[
"Ahmadi",
"Mohammad",
""
],
[
"Izadi",
"Yousef",
""
],
[
"Aslmarand",
"Shahabeddin M.",
""
],
[
"Miller",
"Warner A.",
""
]
] | Even though many scalar field models of dark energy have been considered in the literature, there is another interesting class of dark energy models involving a fluid known as a Chaplygin gas. In addition to describing the dark energy, both scalar-tensor model and the Chaplygin gas model are suitable candidates for exp... |
gr-qc/0207089 | G. S. Asanov | G.S. Asanov | Finslerian Extension of Lorentz Transformations and First-Order
Censorship Theorem | 6 pages, LaTeX. : Final version, accepted for publication in the
April issue of Found. Phys. Lett | Found.Phys.Lett. 15 (2002) 199-207 | null | null | gr-qc | null | Granted the post-Lorentzian relativistic kinematic transformations are
described in the Finslerian framework, the uniformity between the actual light
velocity anisotropy change and the anisotropic deformation of measuring rods
can be the reason proper for the null results of the Michelson-Morley-type
experiments at t... | [
{
"created": "Wed, 24 Jul 2002 06:03:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Asanov",
"G. S.",
""
]
] | Granted the post-Lorentzian relativistic kinematic transformations are described in the Finslerian framework, the uniformity between the actual light velocity anisotropy change and the anisotropic deformation of measuring rods can be the reason proper for the null results of the Michelson-Morley-type experiments at the... |
1706.06993 | Mokdad Mokdad | Mokdad Mokdad | Conformal Scattering of Maxwell Fields on Reissner-Nordstr{\o}m-de
Sitter Black Hole Spacetimes | 30 pages | Annales de l'Institut Fourier, Volume 69 (2019) no. 5 p. 2291-2329 | 10.5802/aif.3295 | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a complete conformal scattering theory for Maxwell fields in the
static exterior region of a Reissner-Nordstr{\o}m-de Sitter black bole
spacetime. This is done using uniform energy decay results that we obtain in a
separate paper, to show that the trace operators are injective and have closed
ranges. We ... | [
{
"created": "Wed, 21 Jun 2017 16:32:15 GMT",
"version": "v1"
}
] | 2019-12-20 | [
[
"Mokdad",
"Mokdad",
""
]
] | We construct a complete conformal scattering theory for Maxwell fields in the static exterior region of a Reissner-Nordstr{\o}m-de Sitter black bole spacetime. This is done using uniform energy decay results that we obtain in a separate paper, to show that the trace operators are injective and have closed ranges. We th... |
gr-qc/0006044 | Jose M. M. Senovilla | B. Coll, S.R. Hildebrandt, J.M.M. Senovilla | Kerr-Schild Symmetries | 15 pages, no figures, LaTeX | Gen.Rel.Grav. 33 (2001) 649-670 | 10.1023/A:1010265830882 | null | gr-qc math.DG | null | We study continuous groups of generalized Kerr-Schild transformations and the
vector fields that generate them in any n-dimensional manifold with a
Lorentzian metric. We prove that all these vector fields can be intrinsically
characterized and that they constitute a Lie algebra if the null deformation
direction is fi... | [
{
"created": "Tue, 13 Jun 2000 08:52:58 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Coll",
"B.",
""
],
[
"Hildebrandt",
"S. R.",
""
],
[
"Senovilla",
"J. M. M.",
""
]
] | We study continuous groups of generalized Kerr-Schild transformations and the vector fields that generate them in any n-dimensional manifold with a Lorentzian metric. We prove that all these vector fields can be intrinsically characterized and that they constitute a Lie algebra if the null deformation direction is fixe... |
1003.2324 | Oleg Zaslavskii | O. B. Zaslavskii | Zel'dovich states with very small mass and charge in nonlinear
electrodynamics coupled to gravity | 11 pages. 1 reference added. To appear in Grav. Cosm. | Gravitat. and Cosmology 16 (2010) 168 | 10.1134/S0202289310020118 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that in non-linear electrodynamics (in particular, Born-Infeld
one) in the framework of general relativity there exist "weakly singular"
configurations such that (i) the proper mass M is finite in spite of
divergences of the energy density, (ii) the electric charge q and Schwarzschild
mass m ~ q can be ma... | [
{
"created": "Thu, 11 Mar 2010 12:50:01 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Apr 2010 13:40:24 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Zaslavskii",
"O. B.",
""
]
] | It is shown that in non-linear electrodynamics (in particular, Born-Infeld one) in the framework of general relativity there exist "weakly singular" configurations such that (i) the proper mass M is finite in spite of divergences of the energy density, (ii) the electric charge q and Schwarzschild mass m ~ q can be made... |
1708.08109 | Daniel Canarutto | Daniel Canarutto | On the notions of energy tensors in tetrad-affine gravity | 7 pages, accepted version to appear on Gravitation & Cosmology | null | 10.1134/S0202289318020056 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We are concerned with the precise modalities by which mathematical
constructions related to energy-tensors can be adapted to a tetrad-affine
setting. We show that, for fairly general gauge field theories formulated in
that setting, two notions of energy tensor--the canonical tensor and the
stress-energy tensor--exact... | [
{
"created": "Sun, 27 Aug 2017 16:57:36 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Nov 2017 18:08:37 GMT",
"version": "v2"
}
] | 2018-06-27 | [
[
"Canarutto",
"Daniel",
""
]
] | We are concerned with the precise modalities by which mathematical constructions related to energy-tensors can be adapted to a tetrad-affine setting. We show that, for fairly general gauge field theories formulated in that setting, two notions of energy tensor--the canonical tensor and the stress-energy tensor--exactly... |
2404.02195 | Jo\~ao Sieiro Dos Santos | Jo\~ao S. Santos, Vitor Cardoso, Jos\'e Nat\'ario | Radiation reaction in weakly magnetized black holes: can the tail term
be ignored in the strong field regime? | 18 pages, 6 figures. Matches published version in PRD | null | null | null | gr-qc astro-ph.HE hep-th physics.acc-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study radiation from charged particles in circular motion around a
Schwarzschild black hole immersed in an asymptotically uniform magnetic field.
In curved space, the radiation reaction force is described by the DeWitt-Brehme
equation, which includes a complicated, non-local tail term. We show that,
contrary to so... | [
{
"created": "Tue, 2 Apr 2024 18:00:01 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jun 2024 18:17:33 GMT",
"version": "v2"
}
] | 2024-06-18 | [
[
"Santos",
"João S.",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Natário",
"José",
""
]
] | We study radiation from charged particles in circular motion around a Schwarzschild black hole immersed in an asymptotically uniform magnetic field. In curved space, the radiation reaction force is described by the DeWitt-Brehme equation, which includes a complicated, non-local tail term. We show that, contrary to some... |
1804.10287 | Juan A. Valiente Kroon | M.J. Cole, I. R\'acz and J.A. Valiente Kroon | Killing spinor data on distorted black hole horizons and the uniqueness
of stationary vacuum black holes | 39 pages, 1 figure | null | 10.1088/1361-6382/aade6e | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make use of the black hole holograph construction of [I. R\'acz,
Stationary black holes as holographs, Class. Quantum Grav. 31, 035006 (2014)]
to analyse the existence of Killing spinors in the domain of dependence of the
horizons of distorted black holes. In particular, we provide conditions on the
bifurcation sp... | [
{
"created": "Thu, 26 Apr 2018 21:41:11 GMT",
"version": "v1"
}
] | 2018-10-17 | [
[
"Cole",
"M. J.",
""
],
[
"Rácz",
"I.",
""
],
[
"Kroon",
"J. A. Valiente",
""
]
] | We make use of the black hole holograph construction of [I. R\'acz, Stationary black holes as holographs, Class. Quantum Grav. 31, 035006 (2014)] to analyse the existence of Killing spinors in the domain of dependence of the horizons of distorted black holes. In particular, we provide conditions on the bifurcation sphe... |
2312.17501 | Sanjay Mandal | Sanjay Mandal, Kazuharu Bamba | Theory of gravity with nonminimal matter-nonmetricity coupling and the
de-Sitter swampland conjectures | 7 pages, comments are welcome | null | null | Local Report Numer: FU-PCG-127 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this study, we investigate swampland conjectures within the setup of
matter and non-metricity nonminimal coupling theories of gravity. We examine
how the inflationary solution produced by a single scalar field can be resolved
with the swampland criteria in string theory regarding the formation of de
Sitter solutio... | [
{
"created": "Fri, 29 Dec 2023 07:50:25 GMT",
"version": "v1"
}
] | 2024-01-01 | [
[
"Mandal",
"Sanjay",
""
],
[
"Bamba",
"Kazuharu",
""
]
] | In this study, we investigate swampland conjectures within the setup of matter and non-metricity nonminimal coupling theories of gravity. We examine how the inflationary solution produced by a single scalar field can be resolved with the swampland criteria in string theory regarding the formation of de Sitter solutions... |
1603.05082 | Mart\'in G. Richarte MR | G. M. Kremer, Mart\'in G. Richarte, and Karla Weber | Self-gravitating systems of ideal gases in the 1PN approximation | 11 pages, 6 figures. Phys. Rev. D 93, 064073 (2016) | Phys. Rev. D 93, 064073 (2016) | 10.1103/PhysRevD.93.064073 | null | gr-qc astro-ph.GA hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain the Maxwell-J\"uttner distribution function at first order in the
post-Newtonian approximation within the framework of general relativity. Taking
into account the aforesaid distribution function, we compute the particle
four-flow and energy-momentum tensor. We focus on the search of static
solutions for the... | [
{
"created": "Wed, 16 Mar 2016 13:12:21 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2016 10:45:33 GMT",
"version": "v2"
}
] | 2016-04-01 | [
[
"Kremer",
"G. M.",
""
],
[
"Richarte",
"Martín G.",
""
],
[
"Weber",
"Karla",
""
]
] | We obtain the Maxwell-J\"uttner distribution function at first order in the post-Newtonian approximation within the framework of general relativity. Taking into account the aforesaid distribution function, we compute the particle four-flow and energy-momentum tensor. We focus on the search of static solutions for the g... |
gr-qc/0107046 | Leonardo Gualtieri | L. Gualtieri, E. Berti, J. A. Pons, G. Miniutti and V. Ferrari | Gravitational signals emitted by a point mass orbiting a neutron star: a
perturbative approach | 36 pages, 7 figures, submimtted to Phys. Rev. D | Phys.Rev. D64 (2001) 104007 | 10.1103/PhysRevD.64.104007 | null | gr-qc astro-ph | null | We compute the energy spectra of the gravitational signals emitted when a
pointlike mass moves on a closed orbit around a non rotating neutron star,
inducing a perturbation of its gravitational field and its internal structure.
The Einstein equations and the hydrodynamical equations are perturbed and
numerically inte... | [
{
"created": "Thu, 12 Jul 2001 17:50:14 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Gualtieri",
"L.",
""
],
[
"Berti",
"E.",
""
],
[
"Pons",
"J. A.",
""
],
[
"Miniutti",
"G.",
""
],
[
"Ferrari",
"V.",
""
]
] | We compute the energy spectra of the gravitational signals emitted when a pointlike mass moves on a closed orbit around a non rotating neutron star, inducing a perturbation of its gravitational field and its internal structure. The Einstein equations and the hydrodynamical equations are perturbed and numerically integr... |
2103.01191 | Carlos Vega | Carlos Vega | Spacetime distances: an exploration | 94 pages, 15 figures. v2: some minor corrections and clarifications,
references updated | null | null | null | gr-qc math.DG | http://creativecommons.org/licenses/by-nc-sa/4.0/ | What is the distance between two points in spacetime? This is a basic
geometric question, which so far has no single, definitive answer. Unlike their
Riemannian cousins, Lorentzian manifolds are not known to carry a canonical
distance function. There is, however, a well-known way to `Riemannianize' a
Lorentzian metri... | [
{
"created": "Mon, 1 Mar 2021 18:35:40 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Mar 2021 14:11:55 GMT",
"version": "v2"
}
] | 2021-03-09 | [
[
"Vega",
"Carlos",
""
]
] | What is the distance between two points in spacetime? This is a basic geometric question, which so far has no single, definitive answer. Unlike their Riemannian cousins, Lorentzian manifolds are not known to carry a canonical distance function. There is, however, a well-known way to `Riemannianize' a Lorentzian metric ... |
2205.00416 | Kamiel Janssens | Kamiel Janssens, Guillaume Boileau, Marie-Anne Bizouard, Nelson
Christensen, Tania Regimbau and Nick van Remortel | Formalism for power spectral density estimation for non-identical and
correlated noise using the null channel in Einstein Telescope | The results have been updated (10/10/2022). Please refer to this new
version | Eur. Phys. J. Plus 138, 352 (2023) | 10.1140/epjp/s13360-023-03948-9 | null | gr-qc physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several proposed gravitational wave interferometers have a triangular
configuration, such as the Einstein Telescope and the Laser Interferometer
Space Antenna. For such a configuration one can construct a unique null channel
insensitive to gravitational waves from all directions. We expand on earlier
work and describ... | [
{
"created": "Sun, 1 May 2022 07:53:22 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jun 2022 13:57:55 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Oct 2022 10:45:43 GMT",
"version": "v3"
}
] | 2023-05-03 | [
[
"Janssens",
"Kamiel",
""
],
[
"Boileau",
"Guillaume",
""
],
[
"Bizouard",
"Marie-Anne",
""
],
[
"Christensen",
"Nelson",
""
],
[
"Regimbau",
"Tania",
""
],
[
"van Remortel",
"Nick",
""
]
] | Several proposed gravitational wave interferometers have a triangular configuration, such as the Einstein Telescope and the Laser Interferometer Space Antenna. For such a configuration one can construct a unique null channel insensitive to gravitational waves from all directions. We expand on earlier work and describe ... |
1808.02427 | Valerio Faraoni | Valerio Faraoni and Jeremy Cot\'e (Bishop's University) | Imperfect fluid description of modified gravities | Added some explanation in the text, typographical errors corrected.
Matches version to appear in Phys. Rev. D | Phys. Rev. D 98, 084019 (2018) | 10.1103/PhysRevD.98.084019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Brans-Dicke-like field of scalar-tensor gravity can be described as an
imperfect fluid in an approach in which the field equations are regarded as
effective Einstein equations. After completing this approach we recover, as a
special case, the known effective fluid for a scalar coupled nonminimally to
the Ricci cu... | [
{
"created": "Tue, 7 Aug 2018 15:43:46 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Oct 2018 20:11:29 GMT",
"version": "v2"
}
] | 2018-10-17 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
],
[
"Coté",
"Jeremy",
"",
"Bishop's University"
]
] | The Brans-Dicke-like field of scalar-tensor gravity can be described as an imperfect fluid in an approach in which the field equations are regarded as effective Einstein equations. After completing this approach we recover, as a special case, the known effective fluid for a scalar coupled nonminimally to the Ricci curv... |
gr-qc/0011047 | Ralf Schuetzhold | Ralf Sch\"utzhold | On the Hawking effect | 16 pages RevTeX, 5 EPS figures added | Phys.Rev.D64:024029,2001 | 10.1103/PhysRevD.64.024029 | null | gr-qc | null | In terms of the Painlev{\'e}-Gullstrand-Lema{\^\i}tre coordinates a rather
general scenario for the gravitational collapse of an object and the subsequent
formation of a horizon is described by a manifestly $C^\infty$-metric. For a
1+1 dimensional model of the collapse the leading contributions to the
Bogoliubov coef... | [
{
"created": "Tue, 14 Nov 2000 09:56:39 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jan 2001 16:42:20 GMT",
"version": "v2"
},
{
"created": "Mon, 5 Mar 2001 14:02:06 GMT",
"version": "v3"
}
] | 2011-07-19 | [
[
"Schützhold",
"Ralf",
""
]
] | In terms of the Painlev{\'e}-Gullstrand-Lema{\^\i}tre coordinates a rather general scenario for the gravitational collapse of an object and the subsequent formation of a horizon is described by a manifestly $C^\infty$-metric. For a 1+1 dimensional model of the collapse the leading contributions to the Bogoliubov coeffi... |
2306.02695 | Jose M. Isidro | P. Fernandez de Cordoba, J.M. Isidro and Rudranil Roy | Thermality of the zero-point length and gravitational selfduality | 15 pages | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | It has been argued that the existence of a zero-point length is the hallmark
of quantum gravity. In this letter we suggest a thermal mechanism whereby this
quantum of length arises in flat, Euclidean spacetime $\mathbb{R}^d$. For this
we consider the infinite sequence of all flat, Euclidean spacetimes
$\mathbb{R}^{d'... | [
{
"created": "Mon, 5 Jun 2023 08:36:39 GMT",
"version": "v1"
}
] | 2023-06-06 | [
[
"de Cordoba",
"P. Fernandez",
""
],
[
"Isidro",
"J. M.",
""
],
[
"Roy",
"Rudranil",
""
]
] | It has been argued that the existence of a zero-point length is the hallmark of quantum gravity. In this letter we suggest a thermal mechanism whereby this quantum of length arises in flat, Euclidean spacetime $\mathbb{R}^d$. For this we consider the infinite sequence of all flat, Euclidean spacetimes $\mathbb{R}^{d'}$... |
1803.09456 | Huaifan Li | Xiong-Ying Guo, Huai-Fan Li, Li-Chun Zhang | Entropy of Higher Dimensional Charged Gauss-Bonnet Black hole in de
Sitter Space | 14 pagess,6 figures, references added, minor corrections to content | Commun. Theor. Phys. 72 (2020) 085403 (7pp) | 10.1088/1572-9494/ab8a25 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fundamental equation of the thermodynamic system gives the relation
between internal energy, entropy and volume of two adjacent equilibrium states.
Taking higher dimensional charged Gauss-Bonnet black hole in de Sitter space as
a thermodynamic system, the state parameters have to meet the fundamental
equation of ... | [
{
"created": "Mon, 26 Mar 2018 07:59:08 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Apr 2018 03:45:44 GMT",
"version": "v2"
},
{
"created": "Thu, 10 May 2018 08:47:58 GMT",
"version": "v3"
},
{
"created": "Sat, 9 Jun 2018 02:35:42 GMT",
"version": "v4"
}
] | 2020-12-09 | [
[
"Guo",
"Xiong-Ying",
""
],
[
"Li",
"Huai-Fan",
""
],
[
"Zhang",
"Li-Chun",
""
]
] | The fundamental equation of the thermodynamic system gives the relation between internal energy, entropy and volume of two adjacent equilibrium states. Taking higher dimensional charged Gauss-Bonnet black hole in de Sitter space as a thermodynamic system, the state parameters have to meet the fundamental equation of th... |
1812.10599 | Hernando Quevedo | Hernando Quevedo, Maria N. Quevedo and Alberto Sanchez | Quasi-homogeneous black hole thermodynamics | null | null | 10.1140/epjc/s10052-019-6745-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although the fundamental equations of ordinary thermodynamic systems are
known to correspond to first-degree homogeneous functions, in the case of
non-ordinary systems like black holes the corresponding fundamental equations
are not homogeneous. We present several arguments, indicating that black holes
should be desc... | [
{
"created": "Thu, 27 Dec 2018 02:28:59 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Quevedo",
"Hernando",
""
],
[
"Quevedo",
"Maria N.",
""
],
[
"Sanchez",
"Alberto",
""
]
] | Although the fundamental equations of ordinary thermodynamic systems are known to correspond to first-degree homogeneous functions, in the case of non-ordinary systems like black holes the corresponding fundamental equations are not homogeneous. We present several arguments, indicating that black holes should be descri... |
gr-qc/0308019 | Allemandi Gianluca | G. Allemandi, M. Francaviglia, M. Raiteri | Charges and Energy in Chern-Simons Theories and Lovelock Gravity | 24 pages | Class.Quant.Grav.20:5103-5120,2003 | 10.1088/0264-9381/20/23/010 | null | gr-qc hep-th | null | Starting from the SO(2,2n) Chern-Simons form in (2n+1) dimensions we
calculate the variation of conserved quantities in Lovelock gravity and
Lovelock-Maxwell gravity through the covariant formalism developed in
gr-qc/0305047. Despite the technical complexity of the Lovelock Lagrangian we
obtain a remarkably simple ex... | [
{
"created": "Thu, 7 Aug 2003 09:50:46 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Allemandi",
"G.",
""
],
[
"Francaviglia",
"M.",
""
],
[
"Raiteri",
"M.",
""
]
] | Starting from the SO(2,2n) Chern-Simons form in (2n+1) dimensions we calculate the variation of conserved quantities in Lovelock gravity and Lovelock-Maxwell gravity through the covariant formalism developed in gr-qc/0305047. Despite the technical complexity of the Lovelock Lagrangian we obtain a remarkably simple expr... |
1602.09109 | Daniel Canarutto | Daniel Canarutto | Two-spinor tetrad and Lie derivatives of Einstein-Cartan-Dirac fields | Typo corrected, bibliography enlarged | null | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An integrated approach to Lie derivatives of spinors, spinor connections and
the gravitational field is presented, in the context of a previously proposed,
partly original formulation of a theory of Einstein-Carta-Maxwell-Dirac fields
based on "minimal geometric data": all the needed underlying structure is
geometric... | [
{
"created": "Mon, 29 Feb 2016 19:23:52 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Sep 2016 13:37:36 GMT",
"version": "v2"
}
] | 2016-09-29 | [
[
"Canarutto",
"Daniel",
""
]
] | An integrated approach to Lie derivatives of spinors, spinor connections and the gravitational field is presented, in the context of a previously proposed, partly original formulation of a theory of Einstein-Carta-Maxwell-Dirac fields based on "minimal geometric data": all the needed underlying structure is geometrical... |
2205.08496 | Ricardo Paszko | Ricardo Paszko | A Simple Model for Quantum Gravity: the one-dimensional case | 10 pages, 3 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Group theory is used to construct a model for quantum gravity and exact
results are obtained in one dimension. Comparison with Regge calculus shows
that the results agree in the strong cosmological constant limit for an open
curve. In the closed case, the average edge length has a minimum value and this
give us a clu... | [
{
"created": "Tue, 17 May 2022 17:10:15 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jun 2022 16:41:13 GMT",
"version": "v2"
}
] | 2022-06-15 | [
[
"Paszko",
"Ricardo",
""
]
] | Group theory is used to construct a model for quantum gravity and exact results are obtained in one dimension. Comparison with Regge calculus shows that the results agree in the strong cosmological constant limit for an open curve. In the closed case, the average edge length has a minimum value and this give us a clue ... |
gr-qc/0312069 | Tanmay Vachaspati | Tanmay Vachaspati | Propagating phase boundaries as sonic horizons | 4 pages; added references and some new discussion; corrected
numerical estimate of temperature and discussion of AB interface | null | null | null | gr-qc astro-ph cond-mat hep-ph hep-th | null | If certain conditions are met, a propagating phase boundary can be a sonic
horizon. Sonic Hawking radiation from such a phase boundary is expected in the
quantum theory. The Hawking temperature for typical values of system parameters
can be as large as $\sim 0.04$ K. Since the setup does not require the physical
tran... | [
{
"created": "Mon, 15 Dec 2003 22:30:31 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Dec 2003 17:41:50 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Vachaspati",
"Tanmay",
""
]
] | If certain conditions are met, a propagating phase boundary can be a sonic horizon. Sonic Hawking radiation from such a phase boundary is expected in the quantum theory. The Hawking temperature for typical values of system parameters can be as large as $\sim 0.04$ K. Since the setup does not require the physical transp... |
2003.09006 | Luis Granda | L. N. Granda | Modified gravity with an exponential function of curvature | 30 pages, 8 figures, version accepted in EPJC | null | 10.1140/epjc/s10052-020-8114-4 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The role of an exponential function of the scalar curvature in the modified
gravity is analyzed. Two models are proposed. A toy model that complies with
local and cosmological constraints and gives appropriate qualitative
description of the cosmic evolution. This model contains a saddle
matter-dominant critical point... | [
{
"created": "Thu, 19 Mar 2020 20:11:18 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jun 2020 00:10:31 GMT",
"version": "v2"
}
] | 2020-07-15 | [
[
"Granda",
"L. N.",
""
]
] | The role of an exponential function of the scalar curvature in the modified gravity is analyzed. Two models are proposed. A toy model that complies with local and cosmological constraints and gives appropriate qualitative description of the cosmic evolution. This model contains a saddle matter-dominant critical point t... |
2212.04251 | Yang Huang | Yang Huang, Bing Sun, Zhoujian Cao | Extending Gibbons-Werner method to bound orbits of massive particles | null | null | 10.1103/PhysRevD.107.104046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Gibbons-Werner method for the gravitational deflection angle of unbound
particles in static spherically symmetric spacetimes is based on Jacobi metric
and Gauss-Bonnet theorem. When it is extended to bound massive particles, there
exists two difficulties: (a) Bound orbits may overlap with themselves
azimuthally. ... | [
{
"created": "Thu, 8 Dec 2022 13:08:12 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Dec 2022 08:33:19 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Apr 2023 04:15:06 GMT",
"version": "v3"
},
{
"created": "Wed, 7 Jun 2023 04:07:09 GMT",
"version": "v4"
},
{
"crea... | 2023-08-03 | [
[
"Huang",
"Yang",
""
],
[
"Sun",
"Bing",
""
],
[
"Cao",
"Zhoujian",
""
]
] | The Gibbons-Werner method for the gravitational deflection angle of unbound particles in static spherically symmetric spacetimes is based on Jacobi metric and Gauss-Bonnet theorem. When it is extended to bound massive particles, there exists two difficulties: (a) Bound orbits may overlap with themselves azimuthally. To... |
gr-qc/0603055 | Abhas Mitra | Abhas Mitra | Radiation Pressure Supported Stars in Einstein Gravity: Eternally
Collapsing Objects | Minor chages in proof. Discusses why the observed BHs are actually
ECOs and Chandrasekhar limit is not applicable to them | Mon.Not.Roy.Astron.Soc.369:492,2006 | 10.1111/j.1365-2966.2006.10332.x | null | gr-qc astro-ph | null | Even when we consider Newtonian stars, i.e., stars with surface gravitational
redshift, z<< 1, it is well known that, theoretically, it is possible to have
stars, supported against self-gravity, almost entirely by radiation pressure.
However, such Newtonian stars must necessarily be supermassive. We point out
that th... | [
{
"created": "Tue, 14 Mar 2006 16:28:43 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Mar 2006 11:15:52 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Jul 2006 10:31:38 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Mitra",
"Abhas",
""
]
] | Even when we consider Newtonian stars, i.e., stars with surface gravitational redshift, z<< 1, it is well known that, theoretically, it is possible to have stars, supported against self-gravity, almost entirely by radiation pressure. However, such Newtonian stars must necessarily be supermassive. We point out that this... |
1612.01018 | James Moffat FIMA C Math FOR | James Moffat, Charles H.-T. Wang | Quantisation of Paths in Space-Time and Non-Perturbative Quantum Gravity | 26 pages | Moffat and Wang 2019 J Phys Math 9(4) ;Towards a Non-Perturbative
Quantum Gravity | 10.4172/2090-0902.1000289 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In previous work we discussed the quantization of paths in spacetime.
Building on these ideas we have developed a mathematically coherent theory
addressing a number of open questions concerning Loop Quantum Gravity. Our
approach develops a discrete spacetime and shows that macroscopic spacetime is
a renormalization l... | [
{
"created": "Sat, 3 Dec 2016 21:13:55 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jun 2018 11:53:38 GMT",
"version": "v2"
}
] | 2019-02-07 | [
[
"Moffat",
"James",
""
],
[
"Wang",
"Charles H. -T.",
""
]
] | In previous work we discussed the quantization of paths in spacetime. Building on these ideas we have developed a mathematically coherent theory addressing a number of open questions concerning Loop Quantum Gravity. Our approach develops a discrete spacetime and shows that macroscopic spacetime is a renormalization lim... |
1004.3508 | Hossein Farajollahi | H. Farajollahi, A. Salehi | Cosmic Dynamics in the Chameleon Cosmology | 16 pages, 9 figures | Int.J.Mod.Phys.D19:621-633,2010 | 10.1142/S0218271810016592 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study in this paper chameleon cosmology applied to
Friedmann-Robertson-Walker space, which gives rise to the equation of state
(EoS) parameter larger than -1 in the past and less than -1 today, satisfying
current observations. We also study cosmological constraints on the model using
the time evolution of the cosm... | [
{
"created": "Tue, 20 Apr 2010 17:15:04 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jun 2011 07:17:19 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Farajollahi",
"H.",
""
],
[
"Salehi",
"A.",
""
]
] | We study in this paper chameleon cosmology applied to Friedmann-Robertson-Walker space, which gives rise to the equation of state (EoS) parameter larger than -1 in the past and less than -1 today, satisfying current observations. We also study cosmological constraints on the model using the time evolution of the cosmol... |
0807.2838 | Sabine Hossenfelder | S. Hossenfelder | A Bi-Metric Theory with Exchange Symmetry | 8 pages, no figures | Phys.Rev.D78:044015,2008 | 10.1103/PhysRevD.78.044015 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose an extension of General Relativity with two different metrics. To
each metric we define a Levi-Cevita connection and a curvature tensor. We then
consider two types of fields, each of which moves according to one of the
metrics and its connection. To obtain the field equations for the second metric
we impos... | [
{
"created": "Thu, 17 Jul 2008 17:25:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hossenfelder",
"S.",
""
]
] | We propose an extension of General Relativity with two different metrics. To each metric we define a Levi-Cevita connection and a curvature tensor. We then consider two types of fields, each of which moves according to one of the metrics and its connection. To obtain the field equations for the second metric we impose ... |
gr-qc/0511115 | Antoine Folacci | Yves D\'ecanini and Antoine Folacci | Off-diagonal coefficients of the DeWitt-Schwinger and Hadamard
representations of the Feynman propagator | 42 pages; v2: Incorrect claims suppressed, ref. added, typos
corrected, expansion of the Van Vleck-Morette determinant improved; v3: Minor
changes and refs. added to match the published version | Phys.Rev.D73:044027,2006 | 10.1103/PhysRevD.73.044027 | null | gr-qc hep-th math-ph math.MP | null | Having in mind applications to gravitational wave theory (in connection with
the radiation reaction problem), stochastic semiclassical gravity (in
connection with the regularization of the noise kernel) and quantum field
theory in higher-dimensional curved spacetime (in connection with the Hadamard
regularization of ... | [
{
"created": "Mon, 21 Nov 2005 14:08:06 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2005 11:12:54 GMT",
"version": "v2"
},
{
"created": "Wed, 22 Feb 2006 16:48:06 GMT",
"version": "v3"
}
] | 2008-12-30 | [
[
"Décanini",
"Yves",
""
],
[
"Folacci",
"Antoine",
""
]
] | Having in mind applications to gravitational wave theory (in connection with the radiation reaction problem), stochastic semiclassical gravity (in connection with the regularization of the noise kernel) and quantum field theory in higher-dimensional curved spacetime (in connection with the Hadamard regularization of th... |
0804.0084 | Tatsuhiko Koike | Tatsuhiko Koike, Hiroshi Kozaki and Hideki Ishihara | Strings in five-dimensional anti-de Sitter space with a symmetry | v2: Typo in Eq.7 is corrected | Phys.Rev.D77:125003,2008 | 10.1103/PhysRevD.77.125003 | OCU-PHYS-276/AP-GR-47 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The equation of motion of an extended object in spacetime reduces to an
ordinary differential equation in the presence of symmetry. By properly
defining of the symmetry with notion of cohomogeneity, we discuss the method
for classifying all these extended objects. We carry out the classification for
the strings in th... | [
{
"created": "Tue, 1 Apr 2008 07:03:42 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Jul 2024 07:00:39 GMT",
"version": "v2"
}
] | 2024-07-04 | [
[
"Koike",
"Tatsuhiko",
""
],
[
"Kozaki",
"Hiroshi",
""
],
[
"Ishihara",
"Hideki",
""
]
] | The equation of motion of an extended object in spacetime reduces to an ordinary differential equation in the presence of symmetry. By properly defining of the symmetry with notion of cohomogeneity, we discuss the method for classifying all these extended objects. We carry out the classification for the strings in the ... |
2307.05568 | Jie Wu | Jie Wu, Jin Li | Subtraction of the confusion foreground and parameter uncertainty of
resolvable galactic binaries on the networks of space-based
gravitational-wave detectors | 13 pages, 8 figures | Phys. Rev. D 108, 124047 (2023) [gr-qc] | 10.1103/PhysRevD.108.124047 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There are tens of millions of compact binary systems in the Milky Way, called
galactic binaries (GBs), most of which are unresolved, and the Gravitational
waves (GWs) emitted overlap to form foreground confusion. By simulating such
foreground confusion, we have studied how LISA, Taiji and TianQin, including
their alt... | [
{
"created": "Mon, 10 Jul 2023 02:56:10 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Dec 2023 01:42:06 GMT",
"version": "v2"
}
] | 2023-12-22 | [
[
"Wu",
"Jie",
""
],
[
"Li",
"Jin",
""
]
] | There are tens of millions of compact binary systems in the Milky Way, called galactic binaries (GBs), most of which are unresolved, and the Gravitational waves (GWs) emitted overlap to form foreground confusion. By simulating such foreground confusion, we have studied how LISA, Taiji and TianQin, including their alter... |
1803.01152 | Jibril Ben Achour | Jibril Ben Achour, Fr\'ed\'eric Lamy, Hongguang Liu, Karim Noui | Polymer Schwarzschild black hole: An effective metric | 6 pages | null | 10.1209/0295-5075/123/20006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the modified Einstein equations obtained in the framework of
effective spherically symmetric polymer models inspired by Loop Quantum
Gravity. When one takes into account the anomaly free point-wise holonomy
quantum corrections, the modification of Einstein equations is parametrized by
a function $f(x)$ of... | [
{
"created": "Sat, 3 Mar 2018 12:36:12 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jun 2018 11:02:22 GMT",
"version": "v2"
},
{
"created": "Thu, 26 Jul 2018 03:29:28 GMT",
"version": "v3"
},
{
"created": "Thu, 31 Jan 2019 10:16:49 GMT",
"version": "v4"
}
] | 2019-02-01 | [
[
"Achour",
"Jibril Ben",
""
],
[
"Lamy",
"Frédéric",
""
],
[
"Liu",
"Hongguang",
""
],
[
"Noui",
"Karim",
""
]
] | We consider the modified Einstein equations obtained in the framework of effective spherically symmetric polymer models inspired by Loop Quantum Gravity. When one takes into account the anomaly free point-wise holonomy quantum corrections, the modification of Einstein equations is parametrized by a function $f(x)$ of o... |
1903.11760 | Lijing Shao | Lijing Shao, Quentin G. Bailey | Testing the Gravitational Weak Equivalence Principle in the
Standard-Model Extension with Binary Pulsars | 7 pages, 1 figure; accepted by PRD | Phys. Rev. D 99, 084017 (2019) | 10.1103/PhysRevD.99.084017 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Standard-Model Extension provides a framework to systematically
investigate possible violation of the Lorentz symmetry. Concerning gravity, the
linearized version was extensively examined. We here cast the first set of
experimental bounds on the nonlinear terms in the field equation from the
anisotropic cubic cur... | [
{
"created": "Thu, 28 Mar 2019 02:22:29 GMT",
"version": "v1"
}
] | 2019-04-17 | [
[
"Shao",
"Lijing",
""
],
[
"Bailey",
"Quentin G.",
""
]
] | The Standard-Model Extension provides a framework to systematically investigate possible violation of the Lorentz symmetry. Concerning gravity, the linearized version was extensively examined. We here cast the first set of experimental bounds on the nonlinear terms in the field equation from the anisotropic cubic curva... |
gr-qc/0607028 | Farid Ya. Khalili | F.Ya.Khalili | Quantum variational measurement and the "optical lever" intracavity
topology of gravitational-wave detectors | 24 pages, 10 figures, 3 tables | Phys.Rev.D75:082003,2007 | 10.1103/PhysRevD.75.082003 | null | gr-qc | null | The intracavity topologies of laser gravitational-wave detectors are the
promising way to obtain sensitivity of these devices significantly better than
the Standard Quantum Limit (SQL). The most challenging element of the
intracavity topologies is the \emph{local meter} which has to monitor position
of a small ($1\di... | [
{
"created": "Fri, 7 Jul 2006 11:11:55 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Khalili",
"F. Ya.",
""
]
] | The intracavity topologies of laser gravitational-wave detectors are the promising way to obtain sensitivity of these devices significantly better than the Standard Quantum Limit (SQL). The most challenging element of the intracavity topologies is the \emph{local meter} which has to monitor position of a small ($1\div1... |
1706.09620 | Edward Malec | Wojciech Kulczycki and Edward Malec | Axial gravitational waves in FLRW cosmology and memory effects | This version matches the published article (Phys. Rev. D 96, 063523
(2017)). A note is added on interaction of axial gravitational waves with
stars' interiors, with 3 new references | Phys. Rev. D 96, 063523 (2017) | 10.1103/PhysRevD.96.063523 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show initial data for gravitational axial waves, that are twice
differentiable but which are not $C^{2}$. They generate wave pulses that
interact with matter in the radiation cosmological era. This forces the
radiation matter to rotate. This rotation is permanent - it persists after the
passage of the gravitationa... | [
{
"created": "Thu, 29 Jun 2017 08:15:12 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2017 08:46:20 GMT",
"version": "v2"
}
] | 2017-10-24 | [
[
"Kulczycki",
"Wojciech",
""
],
[
"Malec",
"Edward",
""
]
] | We show initial data for gravitational axial waves, that are twice differentiable but which are not $C^{2}$. They generate wave pulses that interact with matter in the radiation cosmological era. This forces the radiation matter to rotate. This rotation is permanent - it persists after the passage of the gravitational ... |
1810.09997 | Antoine Leh\'ebel | Eugeny Babichev and Antoine Leh\'ebel | The sound of DHOST | 10 pages, 2 figures. Appendix added in second version | null | 10.1088/1475-7516/2018/12/027 | LPT-Orsay-18-93 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that, in generic higher-order scalar-tensor theories which avoid the
Ostrogradsky instability, the presence of a scalar field significantly modifies
the propagation of matter perturbations, even in weakly curved backgrounds.
This affects notably the speed of sound in the atmosphere of the Earth. It can
also g... | [
{
"created": "Tue, 23 Oct 2018 17:57:01 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Apr 2019 13:18:37 GMT",
"version": "v2"
}
] | 2019-04-02 | [
[
"Babichev",
"Eugeny",
""
],
[
"Lehébel",
"Antoine",
""
]
] | We show that, in generic higher-order scalar-tensor theories which avoid the Ostrogradsky instability, the presence of a scalar field significantly modifies the propagation of matter perturbations, even in weakly curved backgrounds. This affects notably the speed of sound in the atmosphere of the Earth. It can also gen... |
0910.5194 | Kristin Schleich | Kristin Schleich and Donald M. Witt | What does Birkhoff's theorem really tell us? | 19 pages; 6 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Birkhoff's theorem is a classic result that characterizes locally spherically
symmetric solutions of the Einstein equations. In this paper, we illustrate the
consequences of its local nature for the cases of vacuum and positive
cosmological constant. We construct several examples of initial data for
spherically symme... | [
{
"created": "Tue, 27 Oct 2009 18:00:48 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Schleich",
"Kristin",
""
],
[
"Witt",
"Donald M.",
""
]
] | Birkhoff's theorem is a classic result that characterizes locally spherically symmetric solutions of the Einstein equations. In this paper, we illustrate the consequences of its local nature for the cases of vacuum and positive cosmological constant. We construct several examples of initial data for spherically symmetr... |
1701.00780 | Supriya Pan | German S. Sharov, Subhra Bhattacharya, Supriya Pan, Rafael C. Nunes,
Subenoy Chakraborty | A new interacting two fluid model and its consequences | 13 pages, 3 figures, 2 tables; Accepted for publication in MNRAS | Mon. Not. Roy. Astron. Soc, 466 (2017), 3497-3506 | 10.1093/mnras/stw3358 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the background of a homogeneous and isotropic spacetime with zero spatial
curvature, we consider interacting scenarios between two barotropic fluids, one
is the pressureless dark matter (DM) and the other one is dark energy (DE), in
which the equation of state (EoS) in DE is either constant or time dependent.
In p... | [
{
"created": "Tue, 3 Jan 2017 16:40:02 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jan 2017 13:44:08 GMT",
"version": "v2"
}
] | 2017-02-01 | [
[
"Sharov",
"German S.",
""
],
[
"Bhattacharya",
"Subhra",
""
],
[
"Pan",
"Supriya",
""
],
[
"Nunes",
"Rafael C.",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | In the background of a homogeneous and isotropic spacetime with zero spatial curvature, we consider interacting scenarios between two barotropic fluids, one is the pressureless dark matter (DM) and the other one is dark energy (DE), in which the equation of state (EoS) in DE is either constant or time dependent. In par... |
0802.1655 | Marko Vojinovic | Milovan Vasilic and Marko Vojinovic | Single-Pole Interaction of the Particle with the String | This is a contribution to the Proc. of the Seventh International
Conference ''Symmetry in Nonlinear Mathematical Physics'' (June 24-30, 2007,
Kyiv, Ukraine), published in SIGMA (Symmetry, Integrability and Geometry:
Methods and Applications) at http://www.emis.de/journals/SIGMA/ | SIGMA 4:019,2008 | 10.3842/SIGMA.2008.019 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/3.0/ | Within the framework of generalized Papapetrou method, we derive the
effective equations of motion for a string with two particles attached to its
ends, along with appropriate boundary conditions. The equations of motion are
the usual Nambu-Goto-like equations, while boundary conditions turn out to be
equations of mo... | [
{
"created": "Tue, 12 Feb 2008 15:38:27 GMT",
"version": "v1"
}
] | 2008-12-19 | [
[
"Vasilic",
"Milovan",
""
],
[
"Vojinovic",
"Marko",
""
]
] | Within the framework of generalized Papapetrou method, we derive the effective equations of motion for a string with two particles attached to its ends, along with appropriate boundary conditions. The equations of motion are the usual Nambu-Goto-like equations, while boundary conditions turn out to be equations of moti... |
2211.03609 | Santosh Lohakare | Santosh V Lohakare, Francisco Tello-Ortiz, S.K. Tripathy and B. Mishra | Bouncing cosmology in modified gravity with higher-order Gauss-Bonnet
curvature term | 14 pages, 10 figures | Universe 2022, 8(12), 636 | 10.3390/universe8120636 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have studied the bouncing behavior of the cosmological
models formulated at the background of the Hubble function in the F(R, G)
theory of gravity, where R and G denote the Ricci scalar and Gauss-Bonnet
invariant. The actions of bouncing cosmology are studied under consideration of
different viable ... | [
{
"created": "Mon, 7 Nov 2022 14:58:55 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Dec 2022 05:10:27 GMT",
"version": "v2"
}
] | 2022-12-02 | [
[
"Lohakare",
"Santosh V",
""
],
[
"Tello-Ortiz",
"Francisco",
""
],
[
"Tripathy",
"S. K.",
""
],
[
"Mishra",
"B.",
""
]
] | In this paper, we have studied the bouncing behavior of the cosmological models formulated at the background of the Hubble function in the F(R, G) theory of gravity, where R and G denote the Ricci scalar and Gauss-Bonnet invariant. The actions of bouncing cosmology are studied under consideration of different viable mo... |
gr-qc/0703113 | Ying Shao | Ying Shao, Yuanxing Gui | Reconstructing the Equation of State for Dark Energy In the Double
Complex Symmetric Gravitational Theory | 5 pages, 5 figures, accepted by Commun. Theor. Phys | Commun.Theor.Phys.47:1148-1152,2007 | 10.1088/0253-6102/47/6/036 | null | gr-qc | null | We propose to study the accelerating expansion of the universe in the double
complex symmetric gravitational theory (DCSGT). The universe we live in is
taken as the real part of the whole spacetime ${\cal M}^4_C(J)$ which is double
complex. By introducing the spatially flat FRW metric, not only the double
Friedmann E... | [
{
"created": "Thu, 22 Mar 2007 05:20:25 GMT",
"version": "v1"
}
] | 2009-03-19 | [
[
"Shao",
"Ying",
""
],
[
"Gui",
"Yuanxing",
""
]
] | We propose to study the accelerating expansion of the universe in the double complex symmetric gravitational theory (DCSGT). The universe we live in is taken as the real part of the whole spacetime ${\cal M}^4_C(J)$ which is double complex. By introducing the spatially flat FRW metric, not only the double Friedmann Equ... |
gr-qc/0209054 | Giovanni Montani | A.A. Kirillov and G. Montani | Quasi-Isotropization of the Inhomogeneous Mixmaster Universe Induced by
an Inflationary Process | 17 pages, no figure, to appear on PRD | Phys.Rev. D66 (2002) 064010 | 10.1103/PhysRevD.66.064010 | null | gr-qc astro-ph | null | We derive a ``generic'' inhomogeneous ``bridge'' solution for a cosmological
model in the presence of a real self-interacting scalar field. This solution
connects a Kasner-like regime to an inflationary stage of evolution and
therefore provides a dynamical mechanism for the quasi-isotropization of the
universe. In th... | [
{
"created": "Tue, 17 Sep 2002 15:36:19 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Kirillov",
"A. A.",
""
],
[
"Montani",
"G.",
""
]
] | We derive a ``generic'' inhomogeneous ``bridge'' solution for a cosmological model in the presence of a real self-interacting scalar field. This solution connects a Kasner-like regime to an inflationary stage of evolution and therefore provides a dynamical mechanism for the quasi-isotropization of the universe. In the ... |
1209.4228 | Jansen Formiga | J. B. Formiga | Confinement of Fermions via the Spin Connection | 5 pages; unnecessary data in Eq. (1) removed, with a small change in
the text below it; a missing complex factor in (8) was added | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently there has been an interest in studying the role that geometry may
play in the problem of confining fermions to our four-dimensional spacetime. In
general, the focus is on non-Riemannian geometries which possess fields like
torsion and non-metricity. In this paper, the degrees of freedom present in the
spin c... | [
{
"created": "Wed, 19 Sep 2012 12:52:05 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Sep 2012 13:51:32 GMT",
"version": "v2"
}
] | 2012-09-24 | [
[
"Formiga",
"J. B.",
""
]
] | Recently there has been an interest in studying the role that geometry may play in the problem of confining fermions to our four-dimensional spacetime. In general, the focus is on non-Riemannian geometries which possess fields like torsion and non-metricity. In this paper, the degrees of freedom present in the spin con... |
gr-qc/9504012 | Gregory A. Burnett | Gregory A. Burnett | Counterexample to the passive topological censorship of K(pi,1) prime
factors | 3 pages, REVTeX 3.0, 3 figures included, self-unpacking | Phys.Rev. D52 (1995) 6856-6859 | 10.1103/PhysRevD.52.6856 | UF-RAP-95-30 | gr-qc | null | A globally hyperbolic asymptotically flat spacetime is presented (having
non-negative energy density and pressures) that shows that not all K(pi,1)
prime factors of the Cauchy surface topology are passively censored according
to asymptotic observers in contradiction to an argument of Friedman, Schleich,
and Witt.
| [
{
"created": "Mon, 10 Apr 1995 19:28:16 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Burnett",
"Gregory A.",
""
]
] | A globally hyperbolic asymptotically flat spacetime is presented (having non-negative energy density and pressures) that shows that not all K(pi,1) prime factors of the Cauchy surface topology are passively censored according to asymptotic observers in contradiction to an argument of Friedman, Schleich, and Witt. |
gr-qc/9805099 | Karen Camarda | Karen Camarda and Edward Seidel | Three-dimensional simulations of distorted black holes. I. Comparison
with axisymmetric results | 16 pages, 12 figures. Submitted to Phys. Rev. D | Phys.Rev. D59 (1999) 064019 | 10.1103/PhysRevD.59.064019 | null | gr-qc | null | We consider the numerical evolution of black hole initial data sets,
consisting of single black holes distorted by strong gravitational waves, with
a full 3D, nonlinear evolution code. These data sets mimic the late stages of
coalescing black holes. We compare various aspects of the evolution of
axisymmetric initial ... | [
{
"created": "Thu, 28 May 1998 18:21:58 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Camarda",
"Karen",
""
],
[
"Seidel",
"Edward",
""
]
] | We consider the numerical evolution of black hole initial data sets, consisting of single black holes distorted by strong gravitational waves, with a full 3D, nonlinear evolution code. These data sets mimic the late stages of coalescing black holes. We compare various aspects of the evolution of axisymmetric initial da... |
1109.4839 | Wolfgang Kastaun | Wolfgang Kastaun | Nonlinear Decay of r modes in Rapidly Rotating Neutron Stars | 15 pages, 13 figures | null | 10.1103/PhysRevD.84.124036 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the dynamics of r modes at amplitudes in the nonlinear regime
for rapidly but uniformly rotating neutron stars with a polytropic equation of
state. For this, we perform three-dimensional relativistic hydrodynamical
simulations, making the simplifying assumption of a fixed spacetime. We find
that for in... | [
{
"created": "Thu, 22 Sep 2011 15:02:12 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Kastaun",
"Wolfgang",
""
]
] | We investigate the dynamics of r modes at amplitudes in the nonlinear regime for rapidly but uniformly rotating neutron stars with a polytropic equation of state. For this, we perform three-dimensional relativistic hydrodynamical simulations, making the simplifying assumption of a fixed spacetime. We find that for init... |
1910.12456 | Y Aditya M.Sc. M.Phil. Ph.D | Y Aditya, Sanjay Mandal, P.K. Sahoo, D.R.K. Reddy | Observational constraint on interacting Tsallis holographic dark energy
in logarithmic Brans-Dicke theory | 12 pages, 15 figures | Eur. Phys. J. C 79:1020 (2019) | 10.1140/epjc/s10052-019-7534-5 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the dark energy phenomenon by studying the
Tsallis holographic dark energy within the framework of Brans-Dicke (BD)
scalar-tensor theory of gravity [Phys. Rev. \textbf{124}, 925 (1961)]. In this
context, we choose the BD scalar field $\phi$ as a logarithmic function of the
average scale ... | [
{
"created": "Mon, 28 Oct 2019 05:58:28 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Dec 2019 17:56:30 GMT",
"version": "v2"
}
] | 2019-12-20 | [
[
"Aditya",
"Y",
""
],
[
"Mandal",
"Sanjay",
""
],
[
"Sahoo",
"P. K.",
""
],
[
"Reddy",
"D. R. K.",
""
]
] | In this paper, we investigate the dark energy phenomenon by studying the Tsallis holographic dark energy within the framework of Brans-Dicke (BD) scalar-tensor theory of gravity [Phys. Rev. \textbf{124}, 925 (1961)]. In this context, we choose the BD scalar field $\phi$ as a logarithmic function of the average scale fa... |
0807.3009 | Cacciatori Sergio | S. Cacciatori, V. Gorini and A. Kamenshchik | Special Relativity in the 21$^{\rm st}$ century | "to appear in the special (Sept/Oct 2008) issue of Annalen der Physik
(Berlin) commemorating H. Minkowski's 1908 lecture in Cologne" | null | 10.1002/andp.200810321 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper, which is meant to be a tribute to Minkowski's geometrical
insight, rests on the idea that the basic observed symmetries of spacetime
homogeneity and of isotropy of space, which are displayed by the spacetime
manifold in the limiting situation in which the effects of gravity can be
neglected, leads to a fo... | [
{
"created": "Fri, 18 Jul 2008 16:52:56 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Cacciatori",
"S.",
""
],
[
"Gorini",
"V.",
""
],
[
"Kamenshchik",
"A.",
""
]
] | This paper, which is meant to be a tribute to Minkowski's geometrical insight, rests on the idea that the basic observed symmetries of spacetime homogeneity and of isotropy of space, which are displayed by the spacetime manifold in the limiting situation in which the effects of gravity can be neglected, leads to a form... |
2006.02112 | Shao-Wen Wei | Shao-Wen Wei | Topological Charge and Black Hole Photon Spheres | 12 pages, 8 figures, and 2 tables. Dedicated to the memory of Prof.
Yi-Shi Duan | Phys. Rev. D 102, 064039 (2020) | 10.1103/PhysRevD.102.064039 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black hole photon spheres or light rings are closely linked to astronomical
phenomena, such as the gravitational waves and the shadow in spherically
symmetric or axi-symmetric spacetime. In Cunha and Herdeiro [Phys. Rev. Lett.
124, 181101 (2020)], a topological argument was applied for the four
dimensional stationary... | [
{
"created": "Wed, 3 Jun 2020 09:08:04 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Sep 2020 08:50:32 GMT",
"version": "v2"
}
] | 2020-09-16 | [
[
"Wei",
"Shao-Wen",
""
]
] | Black hole photon spheres or light rings are closely linked to astronomical phenomena, such as the gravitational waves and the shadow in spherically symmetric or axi-symmetric spacetime. In Cunha and Herdeiro [Phys. Rev. Lett. 124, 181101 (2020)], a topological argument was applied for the four dimensional stationary, ... |
2009.10793 | Jerzy Matyjasek | Jerzy Matyjasek | Quasinormal modes of dirty black holes in the two-loop renormalizable
effective gravity | null | Phys. Rev. D 102, 124046 (2020) | 10.1103/PhysRevD.102.124046 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider gravitational quasinormal modes of the static and
spherically-symmetric dirty black holes in the effective theory of gravity
which is renormalizable at the two-loop level. It is demonstrated that using
the WKB-Pad\'e summation proposed in \cite{jaOp} one can achieve sufficient
accuracy to calculate correc... | [
{
"created": "Tue, 22 Sep 2020 20:16:54 GMT",
"version": "v1"
}
] | 2021-01-04 | [
[
"Matyjasek",
"Jerzy",
""
]
] | We consider gravitational quasinormal modes of the static and spherically-symmetric dirty black holes in the effective theory of gravity which is renormalizable at the two-loop level. It is demonstrated that using the WKB-Pad\'e summation proposed in \cite{jaOp} one can achieve sufficient accuracy to calculate correcti... |
gr-qc/0501049 | Jian-Yang Zhu | Xin-Qin Gao, Jian-Yang Zhu | Casimir effect for the massless Dirac field in two-dimensional
Reissner-Nordstr\"{o}m spacetime | 10 pages, no figure. Accepted for publication in IJMPD | Int.J.Mod.Phys. D15 (2006) 1473-1486 | 10.1142/S0218271806008796 | null | gr-qc | null | In this paper, the two-dimensional Reissner-Nordstr\"{o}m black hole is
considered as a system of the Casimir type. In this background the Casimir
effect for the massless Dirac field is discussed. The massless Dirac field is
confined between two ``parallel plates'' separated by a distance $L$ and there
is no particle... | [
{
"created": "Sun, 16 Jan 2005 08:20:28 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Apr 2006 11:42:35 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Gao",
"Xin-Qin",
""
],
[
"Zhu",
"Jian-Yang",
""
]
] | In this paper, the two-dimensional Reissner-Nordstr\"{o}m black hole is considered as a system of the Casimir type. In this background the Casimir effect for the massless Dirac field is discussed. The massless Dirac field is confined between two ``parallel plates'' separated by a distance $L$ and there is no particle c... |
1412.6439 | Shahram Jalalzadeh | S. Jalalzadeh, T. Rostami and P. V. Moniz | On the relation between boundary proposals and hidden symmetries of the
extended pre-big bang quantum cosmology | 15 pages, no figures, to appear in European Physical Journal C | Eur. Phys. J. C (2015) 75:38 | 10.1140/epjc/s10052-014-3241-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A framework associating quantum cosmological boundary conditions to
minisuperspace hidden symmetries has been introduced in \cite{7}. The scope of
the application was, notwithstanding the novelty, restrictive because it lacked
a discussion involving realistic matter fields. Therefore, in the herein
letter, we extend ... | [
{
"created": "Fri, 19 Dec 2014 17:07:17 GMT",
"version": "v1"
}
] | 2015-02-26 | [
[
"Jalalzadeh",
"S.",
""
],
[
"Rostami",
"T.",
""
],
[
"Moniz",
"P. V.",
""
]
] | A framework associating quantum cosmological boundary conditions to minisuperspace hidden symmetries has been introduced in \cite{7}. The scope of the application was, notwithstanding the novelty, restrictive because it lacked a discussion involving realistic matter fields. Therefore, in the herein letter, we extend th... |
2301.01096 | Michele Lenzi | Michele Lenzi and Carlos F. Sopuerta | Black Hole Greybody Factors from Korteweg-de Vries Integrals:
Computation | 21 pages, 13 figures, 26 plots, picture in Fig.(12) (bottom panel)
replaced as it was duplicated | null | 10.1103/PhysRevD.107.084039 | null | gr-qc astro-ph.HE hep-th nlin.SI | http://creativecommons.org/licenses/by/4.0/ | It has recently been shown that the dynamics of perturbed non-rotating black
holes (BHs) admits an infinite number of symmetries that are generated by the
flow of the Korteweg-de Vries (KdV) equation. These symmetries lead to an
infinite number of conserved quantities that can be obtained as integrals of
differential... | [
{
"created": "Tue, 3 Jan 2023 13:41:22 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Jan 2023 17:25:06 GMT",
"version": "v2"
}
] | 2023-05-10 | [
[
"Lenzi",
"Michele",
""
],
[
"Sopuerta",
"Carlos F.",
""
]
] | It has recently been shown that the dynamics of perturbed non-rotating black holes (BHs) admits an infinite number of symmetries that are generated by the flow of the Korteweg-de Vries (KdV) equation. These symmetries lead to an infinite number of conserved quantities that can be obtained as integrals of differential p... |
1611.00865 | Cosimo Bambi | Cosimo Bambi, Leonardo Modesto, Leslaw Rachwal | Spacetime completeness of non-singular black holes in conformal gravity | 24 pages, 13 figures. v2: refereed version | JCAP 1705:003,2017 | 10.1088/1475-7516/2017/05/003 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explicitly prove that the Weyl conformal symmetry solves the black hole
singularity problem, otherwise unavoidable in a generally covariant local or
non-local gravitational theory. Moreover, we yield explicit examples of local
and non-local theories enjoying Weyl and diffeomorphism symmetry (in short
co-covariant ... | [
{
"created": "Thu, 3 Nov 2016 02:56:36 GMT",
"version": "v1"
},
{
"created": "Tue, 2 May 2017 20:49:13 GMT",
"version": "v2"
}
] | 2017-05-04 | [
[
"Bambi",
"Cosimo",
""
],
[
"Modesto",
"Leonardo",
""
],
[
"Rachwal",
"Leslaw",
""
]
] | We explicitly prove that the Weyl conformal symmetry solves the black hole singularity problem, otherwise unavoidable in a generally covariant local or non-local gravitational theory. Moreover, we yield explicit examples of local and non-local theories enjoying Weyl and diffeomorphism symmetry (in short co-covariant th... |
0705.1092 | Hongwei Yu | Jialin Zhang, Hongwei Yu | The Unruh effect and entanglement generation for accelerated atoms near
a reflecting boundary | 18 pages, 6 figures | Phys.Rev.D75:104014,2007 | 10.1103/PhysRevD.75.104014 | null | gr-qc quant-ph | null | We study, in the framework of open systems, the entanglement generation of
two independent uniformly accelerated atoms in interaction with the vacuum
fluctuations of massless scalar fields subjected to a reflecting plane
boundary. We demonstrate that, with the presence of the boundary, the
accelerated atoms exhibit d... | [
{
"created": "Tue, 8 May 2007 13:35:01 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Zhang",
"Jialin",
""
],
[
"Yu",
"Hongwei",
""
]
] | We study, in the framework of open systems, the entanglement generation of two independent uniformly accelerated atoms in interaction with the vacuum fluctuations of massless scalar fields subjected to a reflecting plane boundary. We demonstrate that, with the presence of the boundary, the accelerated atoms exhibit dis... |
gr-qc/9509023 | Eric Gourgoulhon | S. Bonazzola, J. Frieben, E. Gourgoulhon (Observatoire de Paris, CNRS) | Spontaneous Symmetry Breaking of Rapidly Rotating Stars in General
Relativity | 29 pages, uuencoded compressed PostScript file. Accepted for
publication in ApJ | Astrophysical Journal 460, 379 (1996 March 20) | 10.1086/176977 | Preprint Observatoire de Paris no. 95008 | gr-qc astro-ph | null | We investigate the effects of general relativity upon the non-axisymmetric
``bar'' mode secular instability of rapidly rotating stars, i.e. the
relativistic and compressible analog of the transition from Maclaurin spheroids
to Jacobi ellipsoids. Our method consists in perturbing a stationary
axisymmetric configuratio... | [
{
"created": "Tue, 12 Sep 1995 17:08:58 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Bonazzola",
"S.",
"",
"Observatoire de Paris, CNRS"
],
[
"Frieben",
"J.",
"",
"Observatoire de Paris, CNRS"
],
[
"Gourgoulhon",
"E.",
"",
"Observatoire de Paris, CNRS"
]
] | We investigate the effects of general relativity upon the non-axisymmetric ``bar'' mode secular instability of rapidly rotating stars, i.e. the relativistic and compressible analog of the transition from Maclaurin spheroids to Jacobi ellipsoids. Our method consists in perturbing a stationary axisymmetric configuration,... |
1309.1629 | Olli Taanila | Rudolf Baier, Stefan Stricker and Olli Taanila | Critical scalar field collapse in AdS_3: an analytic approach | null | null | 10.1088/0264-9381/31/2/025007 | BI-TP 2013/19, TUW-13-13 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analytical solution of a massless scalar field collapsing in a
three dimensional space-time with a negative cosmological constant, i.e.
asymptotically AdS_3. The Einstein and scalar field equations are formulated
using double null Poincare coordinates. Trapping horizons form when a critical
parameter is... | [
{
"created": "Fri, 6 Sep 2013 13:13:39 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Baier",
"Rudolf",
""
],
[
"Stricker",
"Stefan",
""
],
[
"Taanila",
"Olli",
""
]
] | We present an analytical solution of a massless scalar field collapsing in a three dimensional space-time with a negative cosmological constant, i.e. asymptotically AdS_3. The Einstein and scalar field equations are formulated using double null Poincare coordinates. Trapping horizons form when a critical parameter is p... |
gr-qc/9502037 | Roh Suan Tung | Roh Suan Tung and Ted Jacobson | Spinor One-forms as Gravitational Potentials | 7 pages, plain LaTeX, (with minor changes) | Class.Quant.Grav. 12 (1995) L51-L55 | 10.1088/0264-9381/12/6/002 | UMDGR-95-100 | gr-qc | null | General relativity is derived from an action which is quadratic in the
covariant derivative of certain spinor one-form gravitational potentials.
Either a pair of 2-component spinor one-forms or a single Dirac spinor one-form
can be employed. The metric is a quadratic function of these spinor one-forms.
In the 2-compo... | [
{
"created": "Thu, 23 Feb 1995 06:30:27 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Tung",
"Roh Suan",
""
],
[
"Jacobson",
"Ted",
""
]
] | General relativity is derived from an action which is quadratic in the covariant derivative of certain spinor one-form gravitational potentials. Either a pair of 2-component spinor one-forms or a single Dirac spinor one-form can be employed. The metric is a quadratic function of these spinor one-forms. In the 2-compone... |
1911.00540 | Vittorio De Falco Dr | Pavel Bakala, Vittorio De Falco, Emmanuele Battista, Kate\v{r}ina
Goluchov\'a, Debora Lan\v{c}ov\'a, Maurizio Falanga, Luigi Stella | Three-dimensional general relativistic Poynting-Robertson effect II:
Radiation field from a rigidly rotating spherical source | 20 pages, 13 Figures | null | 10.1103/PhysRevD.100.104053 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the three-dimensional, general relativistic Poynting-Robertson
effect in the case of rigidly rotating spherical source which emits radiation
radially in the local comoving frame. Such radiation field is meant to
approximate the field produced by the surface of a rotating neutron star, or by
the central... | [
{
"created": "Fri, 1 Nov 2019 18:28:21 GMT",
"version": "v1"
}
] | 2019-11-27 | [
[
"Bakala",
"Pavel",
""
],
[
"De Falco",
"Vittorio",
""
],
[
"Battista",
"Emmanuele",
""
],
[
"Goluchová",
"Kateřina",
""
],
[
"Lančová",
"Debora",
""
],
[
"Falanga",
"Maurizio",
""
],
[
"Stella",
"Luigi",
""... | We investigate the three-dimensional, general relativistic Poynting-Robertson effect in the case of rigidly rotating spherical source which emits radiation radially in the local comoving frame. Such radiation field is meant to approximate the field produced by the surface of a rotating neutron star, or by the central r... |
gr-qc/0203017 | Sawa Manoff | Sawa Manoff | Mechanics of Continuous Media in $(\bar{L}_n,g)$-Spaces. II. Relative
velocity and deformations | 45 pages, LaTeX | null | null | null | gr-qc | null | Basic notions of continuous media mechanics are introduced for spaces with
affine connections and metrics. The physical interpretation of the notion of
relative velocity is discussed. The notions of deformation velocity tensor,
shear velocity, rotation (vortex) velocity, and expansion velocity are
introduced. Differe... | [
{
"created": "Wed, 6 Mar 2002 10:28:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Manoff",
"Sawa",
""
]
] | Basic notions of continuous media mechanics are introduced for spaces with affine connections and metrics. The physical interpretation of the notion of relative velocity is discussed. The notions of deformation velocity tensor, shear velocity, rotation (vortex) velocity, and expansion velocity are introduced. Different... |
1604.08067 | Lorenzo Fatibene | Matteo Tuveri, Lorenzo Fatibene and Marco Ferraris | Emergent Gravity from an Augmented Variational Principle | 19 pages, references added. Some typos and equations (35-37)
corrected | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A direct and non-trivial link between Padmanabhan's entropy used in emergent
gravity and standard GR action is established. To do that, Augmented
Variational Principles (AVP) will be used. We shall discuss how this link
accounts for the details of the variation of Padmanabhan's action based on
gravitational entropy. ... | [
{
"created": "Wed, 27 Apr 2016 13:42:37 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Apr 2016 08:46:25 GMT",
"version": "v2"
},
{
"created": "Sat, 30 Jul 2016 22:04:40 GMT",
"version": "v3"
}
] | 2016-08-02 | [
[
"Tuveri",
"Matteo",
""
],
[
"Fatibene",
"Lorenzo",
""
],
[
"Ferraris",
"Marco",
""
]
] | A direct and non-trivial link between Padmanabhan's entropy used in emergent gravity and standard GR action is established. To do that, Augmented Variational Principles (AVP) will be used. We shall discuss how this link accounts for the details of the variation of Padmanabhan's action based on gravitational entropy. It... |
1608.06946 | Sridip Pal | Sridip Pal | Quantized Brans Dicke Theory: Phase Transition and Strong Coupling
(Large $\omega$) Limit & General Relativity | v1: 5 Pages and a lonely line ; 1 figure; v2: 5.7 Pages, a note
added, ref. added; emphasized cross-disciplinary interest v3: published
version, graph mended | Phys. Rev. D 94, 084023 (2016) | 10.1103/PhysRevD.94.084023 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that Friedmann-Robertson-Walker (FRW) geometry with flat spatial
section in quantized (Wheeler deWitt quantization) Brans Dicke (BD) theory
reveals a rich phase structure owing to anomalous breaking of a classical
symmetry, which maps the scale factor $a\mapsto\lambda a$ for some constant
$\lambda$. In the we... | [
{
"created": "Wed, 24 Aug 2016 20:01:04 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Sep 2016 10:00:38 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Oct 2016 15:32:38 GMT",
"version": "v3"
}
] | 2016-10-17 | [
[
"Pal",
"Sridip",
""
]
] | We show that Friedmann-Robertson-Walker (FRW) geometry with flat spatial section in quantized (Wheeler deWitt quantization) Brans Dicke (BD) theory reveals a rich phase structure owing to anomalous breaking of a classical symmetry, which maps the scale factor $a\mapsto\lambda a$ for some constant $\lambda$. In the weak... |
1807.09883 | Kartik Prabhu | Kartik Prabhu, Robert M. Wald | Canonical Energy and Hertz Potentials for Perturbations of Schwarzschild
Spacetime | v2: Eqs.(3.39a) and (3.41) corrected and other minor revisions made.
v1: 30 pages | Class. Quantum Grav. 35 235004 (2018) | 10.1088/1361-6382/aae9ae | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Canonical energy is a valuable tool for analyzing the linear stability of
black hole spacetimes; positivity of canonical energy for all perturbations
implies mode stability, whereas the failure of positivity for any perturbation
implies instability. Nevertheless, even in the case of $4$-dimensional
Schwarzschild spac... | [
{
"created": "Wed, 25 Jul 2018 22:24:56 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Oct 2018 19:08:53 GMT",
"version": "v2"
}
] | 2018-11-09 | [
[
"Prabhu",
"Kartik",
""
],
[
"Wald",
"Robert M.",
""
]
] | Canonical energy is a valuable tool for analyzing the linear stability of black hole spacetimes; positivity of canonical energy for all perturbations implies mode stability, whereas the failure of positivity for any perturbation implies instability. Nevertheless, even in the case of $4$-dimensional Schwarzschild spacet... |
1705.01676 | Yu Song | Yu Song, Rui-Hong Yue | Destroying a near-extremal Kerr-Newman-AdS black hole | 11 pages,5 figures | Commun. Theor. Phys. (2018) | 10.1088/0253-6102/69/6/694 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If radiative and self-force effects are neglected, we find that feeding a
test particle into a near-extremal Kerr-Newman-AdS black hole could lead to
destroy their event horizon, giving rise to naked singularities. Hence
radiative and self-force effects must be taken into account to further test
cosmic censorship. Mo... | [
{
"created": "Thu, 4 May 2017 02:24:53 GMT",
"version": "v1"
}
] | 2018-06-13 | [
[
"Song",
"Yu",
""
],
[
"Yue",
"Rui-Hong",
""
]
] | If radiative and self-force effects are neglected, we find that feeding a test particle into a near-extremal Kerr-Newman-AdS black hole could lead to destroy their event horizon, giving rise to naked singularities. Hence radiative and self-force effects must be taken into account to further test cosmic censorship. More... |
1009.3867 | Anil Yadav dr | Anil Kumar Yadav | Some LRS Bianchi-I String Cosmological Models with Variable Deceleration
Parameter | 11 pages, 6 figures, Unlike the previous version the new one contains
the variable DP | Anisotropic Models of Accelerating Universe: 80 - 98, 2011 (LAP,
Germany) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present study deals with LRS Bianchi type I cosmological model
representing massive string. The energy-momentum tensor for such string as
formulated by Letelier (1983) is used to construct massive string cosmological
models for which we assume that the shear scalar ($\sigma$) is proportional to
the expansion scal... | [
{
"created": "Mon, 20 Sep 2010 16:00:31 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Apr 2011 16:04:56 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Aug 2011 14:18:32 GMT",
"version": "v3"
}
] | 2011-12-22 | [
[
"Yadav",
"Anil Kumar",
""
]
] | The present study deals with LRS Bianchi type I cosmological model representing massive string. The energy-momentum tensor for such string as formulated by Letelier (1983) is used to construct massive string cosmological models for which we assume that the shear scalar ($\sigma$) is proportional to the expansion scalar... |
1504.03190 | Sam Dolan Dr | Sam R Dolan and David Dempsey | Bound states of the Dirac equation on Kerr spacetime | 37 pages, 9 figures. For a Focus Issue of Classical and Quantum
Gravity on "Black holes and fundamental fields" | Class. Quant. Grav. 32, 184001 (2015) | 10.1088/0264-9381/32/18/184001 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We formulate the Dirac equation for a massive neutral spin-half particle on a
rotating black hole spacetime, and we consider its (quasi)bound states:
gravitationally-trapped modes which are regular across the future event
horizon. These bound states decay with time, due to the absence of
superradiance in the (single-... | [
{
"created": "Mon, 13 Apr 2015 14:06:34 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Nov 2015 13:18:21 GMT",
"version": "v2"
}
] | 2015-11-13 | [
[
"Dolan",
"Sam R",
""
],
[
"Dempsey",
"David",
""
]
] | We formulate the Dirac equation for a massive neutral spin-half particle on a rotating black hole spacetime, and we consider its (quasi)bound states: gravitationally-trapped modes which are regular across the future event horizon. These bound states decay with time, due to the absence of superradiance in the (single-pa... |
gr-qc/9902004 | Carlo Ungarelli | Marco Cavaglia, Carlo Ungarelli | Canonical and path integral quantisation of string cosmology models | 18 pages,2 eps figures, LaTeX2e, macro files included
(epsf.tex,epsf.sty), macros of Classical and Quantum Gravity used; accepted
for publication on Classical and Quantum Gravity | Class.Quant.Grav.16:1401-1415,1999 | 10.1088/0264-9381/16/4/028 | null | gr-qc hep-th | null | We discuss the quantisation of a class of string cosmology models that are
characterized by scale factor duality invariance. We compute the amplitudes for
the full set of classically allowed and forbidden transitions by applying the
reduce phase space and the path integral methods. We show that these approaches
are c... | [
{
"created": "Mon, 1 Feb 1999 11:25:26 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Cavaglia",
"Marco",
""
],
[
"Ungarelli",
"Carlo",
""
]
] | We discuss the quantisation of a class of string cosmology models that are characterized by scale factor duality invariance. We compute the amplitudes for the full set of classically allowed and forbidden transitions by applying the reduce phase space and the path integral methods. We show that these approaches are con... |
2307.09344 | Yi Yang | Yi Yang, Dong Liu, Ali \"Ovg\"un, and Gaetano Lambiase, Zheng-Wen Long | Rotating black hole mimicker surrounded by the string cloud | null | Phys. Rev. D 109, 024002 (2024) | 10.1103/PhysRevD.109.024002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Traversable wormholes and regular black holes usually represent completely
different scenarios. But in the black bounce spacetime they can be described by
a same line element, which is very attractive. Furthermore, the black hole
photos taken by EHT show that black holes have spin, so spin is an
indispensable intrins... | [
{
"created": "Tue, 18 Jul 2023 15:30:44 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Oct 2023 15:42:43 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Jan 2024 04:55:46 GMT",
"version": "v3"
}
] | 2024-01-09 | [
[
"Yang",
"Yi",
""
],
[
"Liu",
"Dong",
""
],
[
"Övgün",
"Ali",
""
],
[
"Lambiase",
"Gaetano",
""
],
[
"Long",
"Zheng-Wen",
""
]
] | Traversable wormholes and regular black holes usually represent completely different scenarios. But in the black bounce spacetime they can be described by a same line element, which is very attractive. Furthermore, the black hole photos taken by EHT show that black holes have spin, so spin is an indispensable intrinsic... |
2202.07393 | Serena Giardino | Serena Giardino, Valerio Faraoni, Andrea Giusti | First-order thermodynamics of scalar-tensor cosmology | 18 pages, no figures | JCAP 04 (2022) 04, 053 | 10.1088/1475-7516/2022/04/053 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new thermodynamics of scalar-tensor gravity is applied to spatially
homogeneous and isotropic cosmologies in this class of theories and tested on
analytical solutions. A forever-expanding universe approaches the Einstein
"state of equilibrium" with zero effective temperature at late times and
departs from it near s... | [
{
"created": "Tue, 15 Feb 2022 13:39:28 GMT",
"version": "v1"
}
] | 2022-05-06 | [
[
"Giardino",
"Serena",
""
],
[
"Faraoni",
"Valerio",
""
],
[
"Giusti",
"Andrea",
""
]
] | A new thermodynamics of scalar-tensor gravity is applied to spatially homogeneous and isotropic cosmologies in this class of theories and tested on analytical solutions. A forever-expanding universe approaches the Einstein "state of equilibrium" with zero effective temperature at late times and departs from it near spa... |
1303.3143 | Sergio Ulhoa | S. C. Ulhoa | On Quasinormal Modes for Gravitational Perturbations of Bardeen Black
Hole | null | Brazilian Journal of Physics, Volume 44 (2014), Issue 4, pp
380-384 | 10.1007/s13538-014-0209-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate gravitational perturbations of a regular black
hole, particularly Bardeen solution. Such system is solution of Einstein
equations that do not have a singularity at the origin of the radial symmetry.
However it still have events horizons depending on the values of the
characteristic parame... | [
{
"created": "Wed, 13 Mar 2013 12:41:27 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Dec 2013 22:02:31 GMT",
"version": "v2"
}
] | 2014-07-17 | [
[
"Ulhoa",
"S. C.",
""
]
] | In this paper we investigate gravitational perturbations of a regular black hole, particularly Bardeen solution. Such system is solution of Einstein equations that do not have a singularity at the origin of the radial symmetry. However it still have events horizons depending on the values of the characteristic paramete... |
gr-qc/0207062 | Philippe Grandclement | P. Grandclement, V. Kalogera and A. Vecchio | Searching for Gravitational Waves from the Inspiral of Precessing Binary
Systems: Problems with Current Waveforms | Replaced with a shorter version accepted for publication in Phys.
Rev. D. 8 pages, 4 Figs | Phys.Rev. D67 (2003) 042003 | 10.1103/PhysRevD.67.042003 | null | gr-qc astro-ph | null | We consider the problem of searching for gravitational waves emitted during
the inspiral phase of binary systems when the orbital plane precesses due to
relativistic spin-orbit coupling. Such effect takes place when the spins of the
binary members are misaligned with respect to the orbital angular momentum. As
a firs... | [
{
"created": "Tue, 16 Jul 2002 18:35:55 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jan 2003 17:09:47 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Grandclement",
"P.",
""
],
[
"Kalogera",
"V.",
""
],
[
"Vecchio",
"A.",
""
]
] | We consider the problem of searching for gravitational waves emitted during the inspiral phase of binary systems when the orbital plane precesses due to relativistic spin-orbit coupling. Such effect takes place when the spins of the binary members are misaligned with respect to the orbital angular momentum. As a first ... |
1701.03889 | Davide Batic | Davide Batic and Marek Nowakowski and Kirk Morgan | The problem of embedded eigenvalues for the Dirac equation in the
Schwarzschild black hole metric | 12 pages | Universe 2016, 2, 31 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the Dirac equation in a fixed black hole background and different
independent techniques to demonstrate the absence of fermionic bound states
around a Schwarzschild black hole. In particular, we show that no embedded
eigenvalues exist which have been claimed for the case when the energy is less
than the partic... | [
{
"created": "Sat, 14 Jan 2017 08:19:59 GMT",
"version": "v1"
}
] | 2017-01-17 | [
[
"Batic",
"Davide",
""
],
[
"Nowakowski",
"Marek",
""
],
[
"Morgan",
"Kirk",
""
]
] | We use the Dirac equation in a fixed black hole background and different independent techniques to demonstrate the absence of fermionic bound states around a Schwarzschild black hole. In particular, we show that no embedded eigenvalues exist which have been claimed for the case when the energy is less than the particle... |
1002.2386 | Leor Barack | Leor Barack and Norichika Sago | Gravitational self-force on a particle in eccentric orbit around a
Schwarzschild black hole | 42 pages. v3 corrects typos in Eqs. (3.11), (3.12), (4.2), (E25) and
(E26) | Phys.Rev.D81:084021,2010 | 10.1103/PhysRevD.81.084021 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a numerical code for calculating the local gravitational
self-force acting on a pointlike particle in a generic (bound) geodesic orbit
around a Schwarzschild black hole. The calculation is carried out in the Lorenz
gauge: For a given geodesic orbit, we decompose the Lorenz-gauge metric
perturbation equatio... | [
{
"created": "Thu, 11 Feb 2010 17:46:36 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Apr 2010 10:14:36 GMT",
"version": "v2"
},
{
"created": "Thu, 14 May 2015 00:51:18 GMT",
"version": "v3"
}
] | 2015-05-15 | [
[
"Barack",
"Leor",
""
],
[
"Sago",
"Norichika",
""
]
] | We present a numerical code for calculating the local gravitational self-force acting on a pointlike particle in a generic (bound) geodesic orbit around a Schwarzschild black hole. The calculation is carried out in the Lorenz gauge: For a given geodesic orbit, we decompose the Lorenz-gauge metric perturbation equations... |
gr-qc/0301042 | Anthony N. Aguirre | Anthony Aguirre, Steven Gratton | Inflation without a beginning: a null boundary proposal | Minor revisions to match published version; 18 pages, 5 postscript
figures | Phys.Rev. D67 (2003) 083515 | 10.1103/PhysRevD.67.083515 | null | gr-qc astro-ph hep-th | null | We develop our recent suggestion that inflation may be made past eternal, so
that there is no initial cosmological singularity or "beginning of time".
Inflation with multiple vacua generically approaches a steady-state statistical
distribution of regions at these vacua, and our model follows directly from
making this... | [
{
"created": "Fri, 10 Jan 2003 17:42:50 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Mar 2003 15:11:43 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Aguirre",
"Anthony",
""
],
[
"Gratton",
"Steven",
""
]
] | We develop our recent suggestion that inflation may be made past eternal, so that there is no initial cosmological singularity or "beginning of time". Inflation with multiple vacua generically approaches a steady-state statistical distribution of regions at these vacua, and our model follows directly from making this d... |
2002.08184 | Cl\'audio Gomes | Orfeu Bertolami and Cl\'audio Gomes | Nonminimally Coupled Boltzmann Equation I: Foundations | 9 pages | Phys. Rev. D 102, 084051 (2020) | 10.1103/PhysRevD.102.084051 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the Boltzmann equation in the context of a gravity theory with
non-minimal coupling between matter and curvature. We show that as the
energy-momentum tensor is not conserved in these theories, it follows a
condition on the normalisation of an homogeneous distribution function. The
Boltzmann H-theorem is pre... | [
{
"created": "Tue, 18 Feb 2020 15:45:58 GMT",
"version": "v1"
}
] | 2020-10-28 | [
[
"Bertolami",
"Orfeu",
""
],
[
"Gomes",
"Cláudio",
""
]
] | We derive the Boltzmann equation in the context of a gravity theory with non-minimal coupling between matter and curvature. We show that as the energy-momentum tensor is not conserved in these theories, it follows a condition on the normalisation of an homogeneous distribution function. The Boltzmann H-theorem is prese... |
0812.4872 | Liao Liu | Liao Liu | Relics Theory of Dark Matter in quantum evaporating Black Hole | 5 papes,0 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce first a new road to quantize the Schwarzschild black hole. Then
we find that the ground state or relic of the quantum evaporating black hole
can be identified as dark matter.
| [
{
"created": "Mon, 29 Dec 2008 04:54:41 GMT",
"version": "v1"
}
] | 2008-12-31 | [
[
"Liu",
"Liao",
""
]
] | We introduce first a new road to quantize the Schwarzschild black hole. Then we find that the ground state or relic of the quantum evaporating black hole can be identified as dark matter. |
1707.04902 | Matteo Bonetti | Matteo Bonetti, Enrico Barausse, Guillaume Faye, Francesco Haardt,
Alberto Sesana | About gravitational-wave generation by a three-body system | 20 pages, 6 figures | CQG34(2017)215004 | 10.1088/1361-6382/aa8da5 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We highlight some subtleties that affect naive implementations of quadrupolar
and octupolar gravitational waveforms from numerically-integrated trajectories
of three-body systems. Some of those subtleties arise from the requirement that
the source be contained in its "coordinate near zone" when applying the
standard ... | [
{
"created": "Sun, 16 Jul 2017 15:57:11 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2018 15:54:02 GMT",
"version": "v2"
}
] | 2018-01-10 | [
[
"Bonetti",
"Matteo",
""
],
[
"Barausse",
"Enrico",
""
],
[
"Faye",
"Guillaume",
""
],
[
"Haardt",
"Francesco",
""
],
[
"Sesana",
"Alberto",
""
]
] | We highlight some subtleties that affect naive implementations of quadrupolar and octupolar gravitational waveforms from numerically-integrated trajectories of three-body systems. Some of those subtleties arise from the requirement that the source be contained in its "coordinate near zone" when applying the standard PN... |
gr-qc/0209033 | Demetrios Papadopoulos | Demetrios B. Papadopoulos | Acceleration and Cyclotron Radiation, Induced by Gravitational Waves | 16 pages, 1 figure, accepted for publication in Astronomy &
Astrophysics | Astron.Astrophys.396:1045,2002 | 10.1051/0004-6361:20021427 | null | gr-qc | null | The equations which determine the response of a charged particle moving in a
magnetic field to an incident gravitational wave(GW) are derived in the
linearized approximation to general relativity. We briefly discuss several
astrophysical applications of the derived formulae taking into account the
resonance between t... | [
{
"created": "Tue, 10 Sep 2002 10:37:11 GMT",
"version": "v1"
}
] | 2011-05-23 | [
[
"Papadopoulos",
"Demetrios B.",
""
]
] | The equations which determine the response of a charged particle moving in a magnetic field to an incident gravitational wave(GW) are derived in the linearized approximation to general relativity. We briefly discuss several astrophysical applications of the derived formulae taking into account the resonance between the... |
0706.3988 | Vladimir Ivashchuk | S. B. Fadeev and V. D. Ivashchuk | 5-dimensional solution with acceleration and small variation of G | 4 pages, Latex, prepared for Proc. of the Russian summer
school-seminar Modern theoretical problems of gravitation and cosmology,
September 9-16, 2007, TSHPU, Kazan-Yalchik, Russia | null | null | IGC-PFUR/2007-06-1fi | gr-qc astro-ph | null | A 5-dimensional cosmological solution in the model with two 2-forms and two
``phantom'' scalar fields is considered. The model contains two dilatonic
coupling vectors obeying certain restrictions. It is shown that there exists a
time interval where accelerating expansion of ``our'' 3-dimensional space is
compatible w... | [
{
"created": "Wed, 27 Jun 2007 09:21:22 GMT",
"version": "v1"
}
] | 2008-04-17 | [
[
"Fadeev",
"S. B.",
""
],
[
"Ivashchuk",
"V. D.",
""
]
] | A 5-dimensional cosmological solution in the model with two 2-forms and two ``phantom'' scalar fields is considered. The model contains two dilatonic coupling vectors obeying certain restrictions. It is shown that there exists a time interval where accelerating expansion of ``our'' 3-dimensional space is compatible wit... |
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