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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0401004 | John Friedman | John L. Friedman | The Cauchy problem on spacetimes that are not globally hyperbolic | In ``50 Years of the Cauchy Problem in General Relativity,'' ed. P.
Chrusciel and H. Friedrich | null | null | null | gr-qc | null | The initial value problem is well-defined on a class of spacetimes broader
than the globally hyperbolic geometries for which existence and uniqueness
theorems are traditionally proved. Simple examples are the time-nonorientable
spacetimes whose orientable double cover is globally hyperbolic. These
spacetimes have gen... | [
{
"created": "Fri, 2 Jan 2004 20:56:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Friedman",
"John L.",
""
]
] | The initial value problem is well-defined on a class of spacetimes broader than the globally hyperbolic geometries for which existence and uniqueness theorems are traditionally proved. Simple examples are the time-nonorientable spacetimes whose orientable double cover is globally hyperbolic. These spacetimes have gener... |
1001.3020 | Luis Herrera | L. Herrera, A. Di Prisco, J. Ospino | On the stability of the shear-free condition | 19 pages Latex. To appear in Gen. Rel. Grav | Gen. Rel. Grav. 42, (2010), 1585 | 10.1007/s10714-010-0931-6 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The evolution equation for the shear is reobtained for a spherically
symmetric anisotropic, viscous dissipative fluid distribution, which allows us
to investigate conditions for the stability of the shear-free condition. The
specific case of geodesic fluids is considered in detail, showing that the
shear-free conditi... | [
{
"created": "Mon, 18 Jan 2010 11:02:17 GMT",
"version": "v1"
}
] | 2015-05-18 | [
[
"Herrera",
"L.",
""
],
[
"Di Prisco",
"A.",
""
],
[
"Ospino",
"J.",
""
]
] | The evolution equation for the shear is reobtained for a spherically symmetric anisotropic, viscous dissipative fluid distribution, which allows us to investigate conditions for the stability of the shear-free condition. The specific case of geodesic fluids is considered in detail, showing that the shear-free condition... |
2104.11010 | Marcin Kisielowski PhD | Marcin Kisielowski | Properties of the Rovelli-Smolin-DePietri volume operator in the spaces
of monochromatic intertwiners | 32 pages, 2 tables; [v2] minor corrections | null | 10.1088/1361-6382/ac1e70 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study some properties of the Rovelli-Smolin-DePietri volume operator in
loop quantum gravity, which significantly simplify the diagonalization problem
and shed some light on the pattern of degeneracy of the eigenstates. The
operator is defined by its action in the spaces of tensor products
$\mathcal{H}_{j_1}\otime... | [
{
"created": "Thu, 22 Apr 2021 12:15:59 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Apr 2021 07:26:44 GMT",
"version": "v2"
}
] | 2021-09-22 | [
[
"Kisielowski",
"Marcin",
""
]
] | We study some properties of the Rovelli-Smolin-DePietri volume operator in loop quantum gravity, which significantly simplify the diagonalization problem and shed some light on the pattern of degeneracy of the eigenstates. The operator is defined by its action in the spaces of tensor products $\mathcal{H}_{j_1}\otimes ... |
2210.15605 | Pavel Kovtun | Pavel Kovtun | Temperature in relativistic fluids | 14 pages, 3 figures. V2: Small clarifications, version accepted for
publication in PRD | Phys. Rev. D 107, 086012 (2023) | 10.1103/PhysRevD.107.086012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For static matter in a gravitational field, different conventions for
equilibrium local temperature exist in the classic physics literature. We
illustrate the difference between two popular conventions using black-body
radiation in a spherically symmetric gravitational potential. Equilibrium
temperatures defined by t... | [
{
"created": "Thu, 27 Oct 2022 16:48:47 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Apr 2023 19:35:30 GMT",
"version": "v2"
}
] | 2023-04-26 | [
[
"Kovtun",
"Pavel",
""
]
] | For static matter in a gravitational field, different conventions for equilibrium local temperature exist in the classic physics literature. We illustrate the difference between two popular conventions using black-body radiation in a spherically symmetric gravitational potential. Equilibrium temperatures defined by the... |
gr-qc/0301096 | Mikolaj Korzynski | Mikolaj Korzynski and Jerzy Lewandowski | The Normal Conformal Cartan Connection and the Bach Tensor | 30 pages, no figures, LaTeX, to be published in Class. Quant. Grav | Class.Quant.Grav. 20 (2003) 3745-3764 | 10.1088/0264-9381/20/16/314 | null | gr-qc | null | The goal of this paper is to express the Bach tensor of a four dimensional
conformal geometry of an arbitrary signature by the Cartan normal conformal
(CNC) connection. We show that the Bach tensor can be identified with the
Yang-Mills current of the connection. It follows from that result that a
conformal geometry w... | [
{
"created": "Thu, 23 Jan 2003 16:02:31 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Feb 2003 13:32:29 GMT",
"version": "v2"
},
{
"created": "Tue, 24 Jun 2003 13:51:21 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Korzynski",
"Mikolaj",
""
],
[
"Lewandowski",
"Jerzy",
""
]
] | The goal of this paper is to express the Bach tensor of a four dimensional conformal geometry of an arbitrary signature by the Cartan normal conformal (CNC) connection. We show that the Bach tensor can be identified with the Yang-Mills current of the connection. It follows from that result that a conformal geometry who... |
1306.2076 | Prado Martin-Moruno | Prado Martin-Moruno (Victoria University of Wellington), Matt Visser
(Victoria University of Wellington) | Semiclassical energy conditions for quantum vacuum states | V1: 42 pages, 6 figures. V2: 43 pages, 6 figures. Title changed, some
discussion added, 3 references added, some typos fixed. V3: Minor edits.
Published version | JHEP 1309 (2013) 050 | 10.1007/JHEP09(2013)050 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present and develop several nonlinear energy conditions suitable for use
in the semiclassical regime. In particular, we consider the recently formulated
"flux energy condition" (FEC), and the novel "trace-of-square" (TOSEC) and
"determinant" (DETEC) energy conditions. As we shall show, these nonlinear
energy condi... | [
{
"created": "Mon, 10 Jun 2013 00:06:40 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jul 2013 22:34:13 GMT",
"version": "v2"
},
{
"created": "Thu, 12 Sep 2013 02:20:25 GMT",
"version": "v3"
}
] | 2013-09-13 | [
[
"Martin-Moruno",
"Prado",
"",
"Victoria University of Wellington"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | We present and develop several nonlinear energy conditions suitable for use in the semiclassical regime. In particular, we consider the recently formulated "flux energy condition" (FEC), and the novel "trace-of-square" (TOSEC) and "determinant" (DETEC) energy conditions. As we shall show, these nonlinear energy conditi... |
2109.05315 | Valerio Faraoni | Shin'ichi Nojiri, Sergei D. Odintsov, and Valerio Faraoni | Area-law versus R\'enyi and Tsallis black hole entropies | Explanation expanded, one reference added to the bibliography,
matches the version to appear in Phys. Rev. D | Phys. Rev. D 104, 084030 (2021) | 10.1103/PhysRevD.104.084030 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The R\'enyi and Tsallis entropies are discussed as possible alternatives to
the Bekenstein-Hawking area-law entropy. It is pointed out how replacing the
entropy notion, but not the Hawking temperature and the thermodynamical energy
may render the whole black hole thermodynamics inconsistent. The possibility to
relate... | [
{
"created": "Sat, 11 Sep 2021 16:37:30 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Oct 2021 12:50:07 GMT",
"version": "v2"
}
] | 2021-10-13 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei D.",
""
],
[
"Faraoni",
"Valerio",
""
]
] | The R\'enyi and Tsallis entropies are discussed as possible alternatives to the Bekenstein-Hawking area-law entropy. It is pointed out how replacing the entropy notion, but not the Hawking temperature and the thermodynamical energy may render the whole black hole thermodynamics inconsistent. The possibility to relate t... |
gr-qc/0609023 | Lorenzo Iorio | Lorenzo Iorio | Dynamical determination of the Kuiper Belt's mass from motions of the
inner planets of the Solar System | LaTex, 12 pages, no figures, 4 tables, 27 references. One reference
added. To appear in Monthly Notices of the Royal Astronomical Society | Mon.Not.Roy.Astron.Soc.375:1311-1314,2007 | 10.1111/j.1365-2966.2006.11384.x | null | gr-qc astro-ph physics.space-ph | null | In this paper we dynamically determine the mass of the Kuiper Belt Objects by
exploiting the latest observational determinations of the orbital motions of
the inner planets of the Solar System. Our result, in units of terrestrial
masses, is 0.033 +/- 0.115 by modelling the Classical Kuiper Belt Objects as an
ecliptic... | [
{
"created": "Thu, 7 Sep 2006 09:11:43 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Sep 2006 20:18:46 GMT",
"version": "v2"
},
{
"created": "Wed, 8 Nov 2006 22:19:37 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Iorio",
"Lorenzo",
""
]
] | In this paper we dynamically determine the mass of the Kuiper Belt Objects by exploiting the latest observational determinations of the orbital motions of the inner planets of the Solar System. Our result, in units of terrestrial masses, is 0.033 +/- 0.115 by modelling the Classical Kuiper Belt Objects as an ecliptic r... |
2209.01415 | Subenoy Chakraborty | Akash Bose, Gopal Sardar, Subenoy Chakraborty | Analytic Solutions and Observational support: A study of $f(R,T)$
gravity with $f(R,T)=R+h(T)$ | null | Phys.Dark Univ. 37 (2022) 101087 | 10.1016/j.dark.2022.101087 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work deals with cosmological solutions in $f(R,T)$ gravity theory
for perfect fluid with constant equation of state ($\omega$). For a viable
cosmological solution $\omega$ is restricted to $\omega<\dfrac{1}{3}$. Also
depending on the sign of an arbitrary constant one has two possible solutions:
a finite u... | [
{
"created": "Sat, 3 Sep 2022 12:59:11 GMT",
"version": "v1"
}
] | 2022-09-07 | [
[
"Bose",
"Akash",
""
],
[
"Sardar",
"Gopal",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The present work deals with cosmological solutions in $f(R,T)$ gravity theory for perfect fluid with constant equation of state ($\omega$). For a viable cosmological solution $\omega$ is restricted to $\omega<\dfrac{1}{3}$. Also depending on the sign of an arbitrary constant one has two possible solutions: a finite uni... |
1806.03495 | Andrea Geralico | Donato Bini and Andrea Geralico | Gravitational self-force corrections to tidal invariants for spinning
particles on circular orbits in a Schwarzschild spacetime | 15 pages, 1 figure; revtex macros | Phys. Rev. D 98, 084021 (2018) | 10.1103/PhysRevD.98.084021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute gravitational self-force corrections to tidal invariants for
spinning particles moving along circular orbits in a Schwarzschild spacetime.
In particular, we consider the square and the cube of the gravitoelectric
quadrupolar tidal tensor and the square of the gravitomagnetic quadrupolar
tidal tensor. Our r... | [
{
"created": "Sat, 9 Jun 2018 15:55:22 GMT",
"version": "v1"
}
] | 2018-10-24 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
]
] | We compute gravitational self-force corrections to tidal invariants for spinning particles moving along circular orbits in a Schwarzschild spacetime. In particular, we consider the square and the cube of the gravitoelectric quadrupolar tidal tensor and the square of the gravitomagnetic quadrupolar tidal tensor. Our res... |
0711.0146 | Carlo Rovelli | Jonathan Engle, Etera Livine, Roberto Pereira, Carlo Rovelli | LQG vertex with finite Immirzi parameter | null | Nucl.Phys.B799:136-149,2008 | 10.1016/j.nuclphysb.2008.02.018 | null | gr-qc | null | We extend the definition of the "flipped" loop-quantum-gravity vertex to the
case of a finite Immirzi parameter. We cover the Euclidean as well as the
Lorentzian case. We show that the resulting dynamics is defined on a Hilbert
space isomorphic to the one of loop quantum gravity, and that the area operator
has the sa... | [
{
"created": "Thu, 1 Nov 2007 16:00:33 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Dec 2007 13:28:14 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Engle",
"Jonathan",
""
],
[
"Livine",
"Etera",
""
],
[
"Pereira",
"Roberto",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We extend the definition of the "flipped" loop-quantum-gravity vertex to the case of a finite Immirzi parameter. We cover the Euclidean as well as the Lorentzian case. We show that the resulting dynamics is defined on a Hilbert space isomorphic to the one of loop quantum gravity, and that the area operator has the same... |
2407.11880 | Ingemar Bengtsson | Ingemar Bengtsson and Istvan Racz | Evolutionary constraints: Gluing in a toy model | 7 pages, 1 figure | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | It is possible to solve the Einstein constraint equations as an evolutionary
rather than an elliptic system. Here we consider the Gauss constraint in
electrodynamics as a toy model for this, and produce an initial data set for an
electromagnetic pulse surrounded by vacuum.
| [
{
"created": "Tue, 16 Jul 2024 16:03:13 GMT",
"version": "v1"
}
] | 2024-07-17 | [
[
"Bengtsson",
"Ingemar",
""
],
[
"Racz",
"Istvan",
""
]
] | It is possible to solve the Einstein constraint equations as an evolutionary rather than an elliptic system. Here we consider the Gauss constraint in electrodynamics as a toy model for this, and produce an initial data set for an electromagnetic pulse surrounded by vacuum. |
gr-qc/0606029 | Alessandro Melchiorri dr. | Francesco De Bernardis, Elena Giusarma and Alessandro Melchiorri | Constraints on Distance Duality Relation from Sunyaev Zel'dovich Effect
and Chandra X-ray measurements | 9 Pages, 4 Figures. In press on IJMD | Int.J.Mod.Phys. D15 (2006) 759-766 | 10.1142/S0218271806008486 | null | gr-qc | null | We demonstrate that the recent measurements of the angular diameter distance
of 38 cluster of galaxies using Chandra X-ray data and radio observations from
the OVRO and BIMA interferometric arrays place new and independent constraints
on deviations in the duality relation between angular and luminosity distances.
Usi... | [
{
"created": "Wed, 7 Jun 2006 10:52:01 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"De Bernardis",
"Francesco",
""
],
[
"Giusarma",
"Elena",
""
],
[
"Melchiorri",
"Alessandro",
""
]
] | We demonstrate that the recent measurements of the angular diameter distance of 38 cluster of galaxies using Chandra X-ray data and radio observations from the OVRO and BIMA interferometric arrays place new and independent constraints on deviations in the duality relation between angular and luminosity distances. Using... |
2011.10770 | V. G. Gurzadyan | M.Samsonyan, A.A.Kocharyan, A.Stepanian, V.G.Gurzadyan | Cosmic voids and induced hyperbolicity | 5 pages, 1 figure, Eur. Phys. J. Plus (in press); to match the
published version | Eur. Phys. J. Plus, 135, 946 (2020) | 10.1140/epjp/s13360-020-00963-y | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | Cosmic voids - the low density regions in the Universe - as characteristic
features of the large scale matter distribution, are known for their hyperbolic
properties. The latter implies the deviation of photon beams due to their
underdensity, thus mimicing the negative curvature. We now show that the
hyperbolicity ca... | [
{
"created": "Sat, 21 Nov 2020 11:07:02 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Dec 2020 05:37:38 GMT",
"version": "v2"
}
] | 2020-12-03 | [
[
"Samsonyan",
"M.",
""
],
[
"Kocharyan",
"A. A.",
""
],
[
"Stepanian",
"A.",
""
],
[
"Gurzadyan",
"V. G.",
""
]
] | Cosmic voids - the low density regions in the Universe - as characteristic features of the large scale matter distribution, are known for their hyperbolic properties. The latter implies the deviation of photon beams due to their underdensity, thus mimicing the negative curvature. We now show that the hyperbolicity can ... |
gr-qc/9801020 | WU Zhong Chao | Wu Zhong Chao (ICRA) | Quantum Creation of a Black Hole | 16 pages | Int.J.Mod.Phys. D6 (1997) 199 | null | ICRA-96-001 | gr-qc astro-ph hep-th | null | Using the Hartle-Hawking no-boundary proposal for the wave function of the
universe, we can study the wave function and probability of a single black hole
created at the birth of the universe. The black hole originates from a
constrained gravitational instanton with conical singularities. The wave
function and probab... | [
{
"created": "Thu, 8 Jan 1998 21:11:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chao",
"Wu Zhong",
"",
"ICRA"
]
] | Using the Hartle-Hawking no-boundary proposal for the wave function of the universe, we can study the wave function and probability of a single black hole created at the birth of the universe. The black hole originates from a constrained gravitational instanton with conical singularities. The wave function and probabil... |
gr-qc/9405073 | Ranjeet S. Tate | A. Ashtekar and Ranjeet S. Tate | An algebraic extension of Dirac quantization: Examples | 43 pages, Latex, CGPG-94/6-1. (References added; particularly to
earlier work by C.J.Isham using group theoretic ideas, in the introduction.) | J.Math.Phys. 35 (1994) 6434-6470 | 10.1063/1.530684 | null | gr-qc hep-th | null | An extension of the Dirac procedure for the quantization of constrained
systems is necessary to address certain issues that are left open in Dirac's
original proposal. These issues play an important role especially in the
context of non-linear, diffeomorphism invariant theories such as general
relativity. Recently, a... | [
{
"created": "Tue, 31 May 1994 03:25:24 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jun 1994 22:47:24 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Ashtekar",
"A.",
""
],
[
"Tate",
"Ranjeet S.",
""
]
] | An extension of the Dirac procedure for the quantization of constrained systems is necessary to address certain issues that are left open in Dirac's original proposal. These issues play an important role especially in the context of non-linear, diffeomorphism invariant theories such as general relativity. Recently, an ... |
1701.03438 | Guillermo Palma Prof. Dr. | F. Contreras, N. Cruz and G. Palma | Bouncing solutions from generalized EoS | 12 pages, 12 figures | null | 10.1140/epjc/s10052-017-5388-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an exact analytical bouncing solution for a closed universe filled
with only one exotic fluid with negative pressure, obeying a Generalized
Equations of State (GEoS) of the form $P(\rho)=A\rho+B\rho^{\lambda}$, where
$A$, $B$ and $\lambda$ are constants. In our solution $A=-1/3$ and
$\lambda=1/2$ and $B<0$... | [
{
"created": "Thu, 12 Jan 2017 17:59:55 GMT",
"version": "v1"
}
] | 2018-01-17 | [
[
"Contreras",
"F.",
""
],
[
"Cruz",
"N.",
""
],
[
"Palma",
"G.",
""
]
] | We present an exact analytical bouncing solution for a closed universe filled with only one exotic fluid with negative pressure, obeying a Generalized Equations of State (GEoS) of the form $P(\rho)=A\rho+B\rho^{\lambda}$, where $A$, $B$ and $\lambda$ are constants. In our solution $A=-1/3$ and $\lambda=1/2$ and $B<0$ i... |
1603.07931 | Carlo Rovelli | Vincent Bayle, Fran\c{c}ois Collet and Carlo Rovelli | Short-scale Emergence of Classical Geometry, in Euclidean Loop Quantum
Gravity | 17 pages, 12 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the euclidean covariant loop-quantum-gravity vertex numerically,
using a cylindrically symmetric boundary state and a convenient value of the
Barbero-Immirzi parameter. We show that a classical geometry emerges already at
low spin. We also recognise the appearance of the degenerate configurations.
| [
{
"created": "Fri, 25 Mar 2016 14:52:44 GMT",
"version": "v1"
}
] | 2016-03-28 | [
[
"Bayle",
"Vincent",
""
],
[
"Collet",
"François",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We study the euclidean covariant loop-quantum-gravity vertex numerically, using a cylindrically symmetric boundary state and a convenient value of the Barbero-Immirzi parameter. We show that a classical geometry emerges already at low spin. We also recognise the appearance of the degenerate configurations. |
gr-qc/0109047 | Laszlo B. Szabados | Laszlo B Szabados | On certain quasi-local spin-angular momentum expressions for large
spheres near the null infinity | 22 pages, Plain TEX | Class.Quant.Grav. 18 (2001) 5487-5520 | 10.1088/0264-9381/18/24/312 | null | gr-qc | null | The recently suggested quasi-local spin-angular momentum expressions, based
on the Bramson superpotential and on the holomorphic or anti-holomorphic spinor
fields, are calculated for large spheres near the future null infinity of
asymptotically flat Einsten-Maxwell spacetimes. It is shown that although the
expression... | [
{
"created": "Thu, 13 Sep 2001 13:15:21 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Szabados",
"Laszlo B",
""
]
] | The recently suggested quasi-local spin-angular momentum expressions, based on the Bramson superpotential and on the holomorphic or anti-holomorphic spinor fields, are calculated for large spheres near the future null infinity of asymptotically flat Einsten-Maxwell spacetimes. It is shown that although the expression b... |
1605.00864 | Ugur Camci | U. Camci, A. Yildirim, I. Basaran Oz | New exact solutions of Bianchi I, Bianchi III and Kantowski-Sachs
spacetimes in scalar-coupled gravity theories via Noether gauge symmetries | 23 pages, 4 tables | Astroparticle Phys., vol.76, pp.29 (2016) | 10.1016/j.astropartphys.2015.12.006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Noether symmetry approach is useful tool to restrict the arbitrariness in
a gravity theory when the equations of motion are underdetermined due to the
high number of functions to be determined in the ansatz. We consider two
scalar-coupled theories of gravity, one motivated by induced gravity, the other
more stand... | [
{
"created": "Tue, 3 May 2016 12:28:03 GMT",
"version": "v1"
}
] | 2016-05-11 | [
[
"Camci",
"U.",
""
],
[
"Yildirim",
"A.",
""
],
[
"Oz",
"I. Basaran",
""
]
] | The Noether symmetry approach is useful tool to restrict the arbitrariness in a gravity theory when the equations of motion are underdetermined due to the high number of functions to be determined in the ansatz. We consider two scalar-coupled theories of gravity, one motivated by induced gravity, the other more standar... |
1902.07192 | Peter Wolf | Etienne Savalle, Benjamin M. Roberts, Florian Frank, Paul-Eric Pottie,
Ben T. McAllister, Conner Dailey, Andrei Derevianko, Peter Wolf | Novel approaches to dark-matter detection using space-time separated
clocks | 11 pages, 3 figures | null | null | null | gr-qc physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the theoretical analysis and interpretation of space-time
separated clock experiments in the context of a space-time varying scalar field
that is non-universally coupled to the standard model fields. If massive, such
a field is a candidate for dark matter and could be detected in laboratory
experiments. We... | [
{
"created": "Tue, 19 Feb 2019 18:43:29 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Sep 2019 07:34:17 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Sep 2019 09:33:05 GMT",
"version": "v3"
},
{
"created": "Fri, 27 Sep 2019 10:06:32 GMT",
"version": "v4"
},
{
"cre... | 2019-10-15 | [
[
"Savalle",
"Etienne",
""
],
[
"Roberts",
"Benjamin M.",
""
],
[
"Frank",
"Florian",
""
],
[
"Pottie",
"Paul-Eric",
""
],
[
"McAllister",
"Ben T.",
""
],
[
"Dailey",
"Conner",
""
],
[
"Derevianko",
"Andrei",
... | We discuss the theoretical analysis and interpretation of space-time separated clock experiments in the context of a space-time varying scalar field that is non-universally coupled to the standard model fields. If massive, such a field is a candidate for dark matter and could be detected in laboratory experiments. We s... |
1308.5378 | Laleh Sadeghian | Laleh Sadeghian | Star Clusters and Dark Matter as Probes of the Spacetime Geometry of
Massive Black Holes | PhD Dissertation, Submitted to the Washington University in St.
Louis. arXiv admin note: text overlap with arXiv:astro-ph/0508106,
arXiv:0910.3538, arXiv:1208.3931, arXiv:1211.7090, arXiv:hep-ph/0404175 by
other authors | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This thesis includes two main projects. In the first part, we assess the
feasibility of a recently suggested strong-field general relativity test, in
which future observations of a hypothetical class of stars orbiting very close
to the supermassive black hole at the center of our galaxy, known as Sgr A*,
could provid... | [
{
"created": "Sun, 25 Aug 2013 05:44:36 GMT",
"version": "v1"
}
] | 2013-08-27 | [
[
"Sadeghian",
"Laleh",
""
]
] | This thesis includes two main projects. In the first part, we assess the feasibility of a recently suggested strong-field general relativity test, in which future observations of a hypothetical class of stars orbiting very close to the supermassive black hole at the center of our galaxy, known as Sgr A*, could provide ... |
1809.03317 | Saibal Ray | Farook Rahaman, Sabiruddin Molla, Amna Ali and Saibal Ray | Solar system tests in constraining parameters of dyon black holes | 10 pages, major changes in the text, Accepted in European Physical
Journal C | Eur. Phys. J. C, 78 (2018) 948 | 10.1140/epjc/s10052-018-6442-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present letter we examine the possibility of constraining dyon black
holes based on the available observational data at the scale of the Solar
system. For this we consider the classical tests of general relativity, viz.,
the perihelion precession of the planet Mercury and the deflection of light by
the Sun. In... | [
{
"created": "Tue, 4 Sep 2018 06:20:16 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Nov 2018 18:23:50 GMT",
"version": "v2"
}
] | 2018-11-27 | [
[
"Rahaman",
"Farook",
""
],
[
"Molla",
"Sabiruddin",
""
],
[
"Ali",
"Amna",
""
],
[
"Ray",
"Saibal",
""
]
] | In the present letter we examine the possibility of constraining dyon black holes based on the available observational data at the scale of the Solar system. For this we consider the classical tests of general relativity, viz., the perihelion precession of the planet Mercury and the deflection of light by the Sun. In c... |
gr-qc/0205109 | Maeda Hideki | Hideki Maeda, Jun-ichirou Koga and Kei-ichi Maeda | Uniqueness of Self-Similar Asymptotically Friedmann-Robertson-Walker
Spacetime in Brans-Dicke theory | Revised version, 4 pages, no figures, Revtex, accepted for
publication in Physical Review D | Phys.Rev.D66:087501,2002 | 10.1103/PhysRevD.66.087501 | WU-AP/147/02 | gr-qc | null | We investigate spherically symmetric self-similar solutions in Brans-Dicke
theory. Assuming a perfect fluid with the equation of state $p=(\gamma-1)\mu (1
\le \gamma<2)$, we show that there are no non-trivial solutions which approach
asymptotically to the flat Friedmann-Robertson-Walker spacetime if the energy
densit... | [
{
"created": "Sat, 25 May 2002 21:21:33 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Sep 2002 08:29:21 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Maeda",
"Hideki",
""
],
[
"Koga",
"Jun-ichirou",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We investigate spherically symmetric self-similar solutions in Brans-Dicke theory. Assuming a perfect fluid with the equation of state $p=(\gamma-1)\mu (1 \le \gamma<2)$, we show that there are no non-trivial solutions which approach asymptotically to the flat Friedmann-Robertson-Walker spacetime if the energy density ... |
1610.03079 | Devin Hansen | Devin Hansen, David Kubiznak and Robert Mann | Horizon Thermodynamics from Einstein's Equation of State | 5 pages, 0 figures | null | 10.1016/j.physletb.2017.04.076 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By regarding the Einstein equations as equation(s) of state, we demonstrate
that a full cohomogeneity horizon first law can be derived in horizon
thermodynamics. In this approach both the entropy and the free energy are
derived concepts, while the standard (degenerate) horizon first law is
recovered by a Legendre pro... | [
{
"created": "Mon, 10 Oct 2016 20:08:33 GMT",
"version": "v1"
}
] | 2017-06-28 | [
[
"Hansen",
"Devin",
""
],
[
"Kubiznak",
"David",
""
],
[
"Mann",
"Robert",
""
]
] | By regarding the Einstein equations as equation(s) of state, we demonstrate that a full cohomogeneity horizon first law can be derived in horizon thermodynamics. In this approach both the entropy and the free energy are derived concepts, while the standard (degenerate) horizon first law is recovered by a Legendre proje... |
2211.03234 | Nikodem Poplawski | Francisco Ribeiro Benard Guedes and Nikodem Janusz Pop{\l}awski | General-relativistic wave$-$particle duality with torsion | 14 pages, 1 figure; published version | Class. Quantum Grav. 41, 065011 (2024) | 10.1088/1361-6382/ad1fcb | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose that the four-velocity of a Dirac particle is related to its
relativistic wave function by $u^i=\bar{\psi}\gamma^i\psi/\bar{\psi}\psi$. This
relativistic wave$-$particle duality relation is demonstrated for a free
particle related to a plane wave in a flat spacetime. For a curved spacetime
with torsion, th... | [
{
"created": "Sun, 6 Nov 2022 23:09:57 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2023 21:31:23 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Jul 2024 17:42:22 GMT",
"version": "v3"
}
] | 2024-07-08 | [
[
"Guedes",
"Francisco Ribeiro Benard",
""
],
[
"Popławski",
"Nikodem Janusz",
""
]
] | We propose that the four-velocity of a Dirac particle is related to its relativistic wave function by $u^i=\bar{\psi}\gamma^i\psi/\bar{\psi}\psi$. This relativistic wave$-$particle duality relation is demonstrated for a free particle related to a plane wave in a flat spacetime. For a curved spacetime with torsion, the ... |
1906.06411 | Adria Delhom | Adria Delhom, Caio F. B. Macedo, Gonzalo J. Olmo, Luis C. B. Crispino | Absorption by black hole remnants in metric-affine gravity | 9 pages, 7 figures, Accepted for publication in PRD | null | 10.1103/PhysRevD.100.024016 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using numerical methods, we investigate the absorption properties of a family
of nonsingular solutions {which arise in different metric-affine theories, such
as quadratic and Born-Infeld gravity.} These solutions continuously interpolate
between Schwarzschild black holes and naked solitons with wormhole topology.
The... | [
{
"created": "Fri, 14 Jun 2019 21:36:45 GMT",
"version": "v1"
}
] | 2019-07-24 | [
[
"Delhom",
"Adria",
""
],
[
"Macedo",
"Caio F. B.",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Crispino",
"Luis C. B.",
""
]
] | Using numerical methods, we investigate the absorption properties of a family of nonsingular solutions {which arise in different metric-affine theories, such as quadratic and Born-Infeld gravity.} These solutions continuously interpolate between Schwarzschild black holes and naked solitons with wormhole topology. The r... |
2310.02834 | Lorenzo Iorio | Lorenzo Iorio | Post-Newtonian orbital effects induced by the mass quadrupole and spin
octupole moments of an axisymmetric body | LaTex2e, 6 Figures, 2 Tables, 22 pages. Version matching the one at
press in The Astronomical Journal | Astron. J. 167 (2024) 78 | 10.3847/1538-3881/ad1833 | null | gr-qc astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The post-Newtonian orbital effects induced by the mass quadrupole and spin
octupole moments of an isolated, oblate spheroid of constant density that is
rigidly and uniformly rotating on the motion of a test particle are
analytically worked out for an arbitrary orbital configuration and without any
preferred orientati... | [
{
"created": "Wed, 4 Oct 2023 14:01:46 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Oct 2023 13:41:24 GMT",
"version": "v2"
},
{
"created": "Sat, 16 Dec 2023 05:40:06 GMT",
"version": "v3"
},
{
"created": "Fri, 19 Jan 2024 12:13:18 GMT",
"version": "v4"
},
{
"cre... | 2024-01-31 | [
[
"Iorio",
"Lorenzo",
""
]
] | The post-Newtonian orbital effects induced by the mass quadrupole and spin octupole moments of an isolated, oblate spheroid of constant density that is rigidly and uniformly rotating on the motion of a test particle are analytically worked out for an arbitrary orbital configuration and without any preferred orientation... |
1408.2084 | Philippe G. LeFloch | Philippe G. LeFloch and Jacques Smulevici | Future asymptotics and geodesic completeness of polarized T2-symmetric
spacetimes | 34 pages | Anal. PDE 9 (2016) 363-395 | 10.2140/apde.2016.9.363 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the late-time asymptotics of future expanding, polarized
vacuum Einstein spacetimes with T2-symmetry on T3, which, by definition, admit
two spacelike Killing fields. Our main result is the existence of a stable
asymptotic regime within this class, that is, we provide here a full
description of the late... | [
{
"created": "Sat, 9 Aug 2014 11:54:50 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Jan 2016 07:08:14 GMT",
"version": "v2"
},
{
"created": "Fri, 29 Jan 2016 16:54:08 GMT",
"version": "v3"
}
] | 2016-06-22 | [
[
"LeFloch",
"Philippe G.",
""
],
[
"Smulevici",
"Jacques",
""
]
] | We investigate the late-time asymptotics of future expanding, polarized vacuum Einstein spacetimes with T2-symmetry on T3, which, by definition, admit two spacelike Killing fields. Our main result is the existence of a stable asymptotic regime within this class, that is, we provide here a full description of the late-t... |
1503.08553 | Muhammed Amir | Muhammed Amir and Sushant G. Ghosh | Rotating Hayward's regular black hole as particle accelerator | 10 pages, 10 figures, 4 tables, accepted to be published in Journal
of High Energy Physics | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Ban\~{a}dos, Silk and West (BSW) demonstrated that the extremal
Kerr black hole can act as a particle accelerator with arbitrarily high
center-of-mass energy ($E_{CM}$) when the collision takes place near the
horizon. The rotating Hayward's regular black hole, apart from Mass ($M$) and
angular momentum ($a$... | [
{
"created": "Mon, 30 Mar 2015 06:35:22 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jun 2015 10:08:43 GMT",
"version": "v2"
}
] | 2015-06-11 | [
[
"Amir",
"Muhammed",
""
],
[
"Ghosh",
"Sushant G.",
""
]
] | Recently, Ban\~{a}dos, Silk and West (BSW) demonstrated that the extremal Kerr black hole can act as a particle accelerator with arbitrarily high center-of-mass energy ($E_{CM}$) when the collision takes place near the horizon. The rotating Hayward's regular black hole, apart from Mass ($M$) and angular momentum ($a$),... |
1209.3147 | Esmaeil Ebrahimi | Esmaeil Ebrahimi, Ahmad Sheykhi, Hamzeh Alavirad | Interacting generalized ghost dark energy in non-flat universe | 14 Pages, 10figures | null | 10.2478/s11534-013-0253-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the generalized Quantum Chromodynamics (QCD) ghost model of
dark energy in the framework of Einstein gravity. First, we study the
non-interacting generalized ghost dark energy in a flat
Friedmann-Robertson-Walker (FRW) background. We obtain the equation of state
parameter, $w_D=p/\rho$, the deceleratio... | [
{
"created": "Fri, 14 Sep 2012 10:42:43 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Oct 2012 16:07:42 GMT",
"version": "v2"
},
{
"created": "Thu, 27 Jun 2013 03:13:53 GMT",
"version": "v3"
}
] | 2015-06-11 | [
[
"Ebrahimi",
"Esmaeil",
""
],
[
"Sheykhi",
"Ahmad",
""
],
[
"Alavirad",
"Hamzeh",
""
]
] | We investigate the generalized Quantum Chromodynamics (QCD) ghost model of dark energy in the framework of Einstein gravity. First, we study the non-interacting generalized ghost dark energy in a flat Friedmann-Robertson-Walker (FRW) background. We obtain the equation of state parameter, $w_D=p/\rho$, the deceleration ... |
gr-qc/0511123 | Naresh Dadhich | Naresh Dadhich | Derivation of the Raychaudhuri Equation | 8 pages, latex file, Pedagogical, One technical incorrect statement
corrected and some minor rephrasing | null | null | null | gr-qc astro-ph hep-th | null | As a homage to A K Raychaudhuri, I derive in a straightforward way his famous
equation and also indicate the problems he was last engaged in.
| [
{
"created": "Wed, 23 Nov 2005 10:19:49 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Nov 2005 06:44:29 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Dadhich",
"Naresh",
""
]
] | As a homage to A K Raychaudhuri, I derive in a straightforward way his famous equation and also indicate the problems he was last engaged in. |
gr-qc/0209076 | Vitor Cardoso | J. T. Mendonca, Vitor Cardoso | Gravitational Optics: Self-phase modulation and harmonic cascades | 12 pages, REVTEX4 | Phys.Rev. D66 (2002) 104009 | 10.1103/PhysRevD.66.104009 | null | gr-qc astro-ph hep-ph hep-th physics.optics | null | Nonlinear wave interaction of low amplitude gravitational waves in flat
space-time is considered. Analogy with optics is established. It is shown that
the flat metric space-time is equivalent to a centro-symmetric optical medium,
with no second order susceptibility. The lowest order nonlinear effects are
those due to... | [
{
"created": "Sat, 21 Sep 2002 08:28:22 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Nov 2002 10:24:57 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Mendonca",
"J. T.",
""
],
[
"Cardoso",
"Vitor",
""
]
] | Nonlinear wave interaction of low amplitude gravitational waves in flat space-time is considered. Analogy with optics is established. It is shown that the flat metric space-time is equivalent to a centro-symmetric optical medium, with no second order susceptibility. The lowest order nonlinear effects are those due to t... |
1408.3514 | Govind Menon | Govind Menon and Charles Dermer | Local, Non-Geodesic, Timelike Currents in the Force-Free Magnetosphere
of a Kerr Black Hole | null | null | 10.1007/s10714-015-1896-2 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we use previously developed exact solutions to present some of
the curious features of a force-free magnetosphere in a Kerr background. More
precisely, we obtain a hitherto unseen timelike current in the force-free
magnetosphere that does not flow along a geodesic. The electromagnetic field in
this cas... | [
{
"created": "Fri, 15 Aug 2014 11:47:39 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Nov 2014 18:08:41 GMT",
"version": "v2"
},
{
"created": "Thu, 2 Apr 2015 14:20:00 GMT",
"version": "v3"
}
] | 2015-04-03 | [
[
"Menon",
"Govind",
""
],
[
"Dermer",
"Charles",
""
]
] | In this paper, we use previously developed exact solutions to present some of the curious features of a force-free magnetosphere in a Kerr background. More precisely, we obtain a hitherto unseen timelike current in the force-free magnetosphere that does not flow along a geodesic. The electromagnetic field in this case ... |
1008.2113 | Bijan Saha Dr. | Yu.P. Rybakov, G.N. Shikin, Yu.A. Popov and Bijan Saha | Electromagnetic field with induced massive term: Case with spinor field | 8 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider an interacting system of spinor and electromagnetic field,
explicitly depending on the electromagnetic potentials, i.e., interaction with
broken gauge invariance. The Lagrangian for interaction is chosen in such a way
that the electromagnetic field equation acquires an additional term, which in
some cases... | [
{
"created": "Thu, 12 Aug 2010 13:57:41 GMT",
"version": "v1"
}
] | 2010-08-13 | [
[
"Rybakov",
"Yu. P.",
""
],
[
"Shikin",
"G. N.",
""
],
[
"Popov",
"Yu. A.",
""
],
[
"Saha",
"Bijan",
""
]
] | We consider an interacting system of spinor and electromagnetic field, explicitly depending on the electromagnetic potentials, i.e., interaction with broken gauge invariance. The Lagrangian for interaction is chosen in such a way that the electromagnetic field equation acquires an additional term, which in some cases i... |
2405.06731 | Jorge Ovalle | J. Ovalle | Schwarzschild black hole revisited: Before the complete collapse | 6 pages | null | 10.1103/PhysRevD.109.104032 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Within the framework of general relativity, we explore the interior of the
Schwarzschild black hole before complete collapse occurs, finding that the
exterior is perfectly compatible with a source much more complex than a
pointlike mass. We provide a set of inner geometries for singular and regular
black holes that s... | [
{
"created": "Fri, 10 May 2024 15:54:20 GMT",
"version": "v1"
}
] | 2024-05-14 | [
[
"Ovalle",
"J.",
""
]
] | Within the framework of general relativity, we explore the interior of the Schwarzschild black hole before complete collapse occurs, finding that the exterior is perfectly compatible with a source much more complex than a pointlike mass. We provide a set of inner geometries for singular and regular black holes that smo... |
2207.00643 | Miguel Cruz | V. H. C\'ardenas, Miguel Cruz and Samuel Lepe | Holography and matter creation revisited | 9 pages, 7 figures. Accepted for publication in Physics of the Dark
Universe | Phys. Dark Univ. 37, 101122 (2022) | 10.1016/j.dark.2022.101122 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The consideration of the holographic dark energy approach and matter creation
effects in a single cosmological model is carried out in this work accordingly,
we discuss some cases of interest. We test this cosmological proposal against
recent observations. Considering the best fit values obtained for the free
cosmolo... | [
{
"created": "Fri, 1 Jul 2022 19:37:56 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Oct 2022 23:16:56 GMT",
"version": "v2"
}
] | 2022-10-19 | [
[
"Cárdenas",
"V. H.",
""
],
[
"Cruz",
"Miguel",
""
],
[
"Lepe",
"Samuel",
""
]
] | The consideration of the holographic dark energy approach and matter creation effects in a single cosmological model is carried out in this work accordingly, we discuss some cases of interest. We test this cosmological proposal against recent observations. Considering the best fit values obtained for the free cosmologi... |
gr-qc/0403023 | Scott Pollack | Scott E Pollack | LISA Science Results in the Presence of Data Disturbances | null | Class.Quant.Grav. 21 (2004) 3419-3432 | 10.1088/0264-9381/21/14/007 | null | gr-qc | null | Each spacecraft in the Laser Interferometer Space Antenna houses a proof mass
which follows a geodesic through spacetime. Disturbances which change the proof
mass position, momentum, and/or acceleration will appear in the LISA data
stream as additive quadratic functions. These data disturbances inhibit signal
extract... | [
{
"created": "Thu, 4 Mar 2004 18:31:41 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Pollack",
"Scott E",
""
]
] | Each spacecraft in the Laser Interferometer Space Antenna houses a proof mass which follows a geodesic through spacetime. Disturbances which change the proof mass position, momentum, and/or acceleration will appear in the LISA data stream as additive quadratic functions. These data disturbances inhibit signal extractio... |
1410.6285 | T. Padmanabhan | T. Padmanabhan | Emergent Gravity Paradigm: Recent Progress | Invited Review for the MPLA Special Issue on "New trends on theory of
gravity''; edited by A. Mazumdar | null | 10.1142/S0217732315400076 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Research during the last one decade or so suggests that the gravitational
field equations in a large class of theories (including, but not limited to,
general relativity) have the same status as the equations of, say, gas dynamics
or elasticity. This paradigm provides a refreshingly different way of
interpreting spac... | [
{
"created": "Thu, 23 Oct 2014 08:25:37 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Padmanabhan",
"T.",
""
]
] | Research during the last one decade or so suggests that the gravitational field equations in a large class of theories (including, but not limited to, general relativity) have the same status as the equations of, say, gas dynamics or elasticity. This paradigm provides a refreshingly different way of interpreting spacet... |
gr-qc/0203095 | Valter Moretti | V. Moretti (Department of Mathematics and INFN, Trento University) | Aspects of noncommutative Lorentzian geometry for globally hyperbolic
spacetimes | 43 pages, structure of the paper changed and presentation strongly
improved, references added, minor typos corrected, title changed, accepted
for publication in Reviews in Mathematical Physics | Rev.Math.Phys.15:1171-1217,2003 | 10.1142/S0129055X03001886 | UTM-615 | gr-qc hep-th math-ph math.MP | null | Connes' functional formula of the Riemannian distance is generalized to the
Lorentzian case using the so-called Lorentzian distance, the d'Alembert
operator and the causal functions of a globally hyperbolic spacetime. As a step
of the presented machinery, a proof of the almost-everywhere smoothness of the
Lorentzian ... | [
{
"created": "Tue, 26 Mar 2002 18:42:56 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Mar 2002 09:30:10 GMT",
"version": "v2"
},
{
"created": "Wed, 5 Nov 2003 10:06:47 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Moretti",
"V.",
"",
"Department of Mathematics and INFN, Trento University"
]
] | Connes' functional formula of the Riemannian distance is generalized to the Lorentzian case using the so-called Lorentzian distance, the d'Alembert operator and the causal functions of a globally hyperbolic spacetime. As a step of the presented machinery, a proof of the almost-everywhere smoothness of the Lorentzian di... |
gr-qc/0310117 | J. Ponce de Leon | J. Ponce de Leon | Electromagnetic mass-models in general relativity reexamined | null | Gen.Rel.Grav. 36 (2004) 1451-1459; Gen.Rel.Grav. 36 (2004)
1453-1461 | null | null | gr-qc | null | The problem of constructing a model of an extended charged particle within
the context of general relativity has a long and distinguished history. The
distinctive feature of these models is that, in some way or another, they
require the presence of negative mass in order to maintain stability against
Coulomb's repuls... | [
{
"created": "Tue, 28 Oct 2003 01:46:53 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Leon",
"J. Ponce",
""
]
] | The problem of constructing a model of an extended charged particle within the context of general relativity has a long and distinguished history. The distinctive feature of these models is that, in some way or another, they require the presence of negative mass in order to maintain stability against Coulomb's repulsio... |
2206.08746 | Marek Li\v{s}ka | Ana Alonso-Serrano, Luis J. Garay and Marek Li\v{s}ka | Noether charge formalism for Weyl invariant theories of gravity | 20 pages | null | 10.1103/PhysRevD.106.064024 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational theories invariant under transverse diffeomorphisms and Weyl
transformations have the same classical solutions as the corresponding fully
diffeomorphism invariant theories. However, they solve some of the problems
related to the cosmological constant and in principle allow local energy
non-conservation.... | [
{
"created": "Fri, 17 Jun 2022 13:03:56 GMT",
"version": "v1"
}
] | 2022-10-05 | [
[
"Alonso-Serrano",
"Ana",
""
],
[
"Garay",
"Luis J.",
""
],
[
"Liška",
"Marek",
""
]
] | Gravitational theories invariant under transverse diffeomorphisms and Weyl transformations have the same classical solutions as the corresponding fully diffeomorphism invariant theories. However, they solve some of the problems related to the cosmological constant and in principle allow local energy non-conservation. I... |
1911.01669 | Kazuya Koyama | Hiromu Ogawa, Tsutomu Kobayashi, Kazuya Koyama | Relativistic stars in a cubic Galileon Universe | 8 pages, 3 figures. Accepted for publication in PRD | Phys. Rev. D 101, 024026 (2020) | 10.1103/PhysRevD.101.024026 | RUP-19-29 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study relativistic stars in Hordenski theories that evade the
gravitational wave constraints and exhibit the Vainshtein mechanism, focusing
on a model based on the cubic Galileon Lagrangian. We derive the scalar field
profile for static spherically symmetric objects in asymptotically de Sitter
space-time with a li... | [
{
"created": "Tue, 5 Nov 2019 08:55:55 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Dec 2019 16:40:06 GMT",
"version": "v2"
}
] | 2020-01-15 | [
[
"Ogawa",
"Hiromu",
""
],
[
"Kobayashi",
"Tsutomu",
""
],
[
"Koyama",
"Kazuya",
""
]
] | We study relativistic stars in Hordenski theories that evade the gravitational wave constraints and exhibit the Vainshtein mechanism, focusing on a model based on the cubic Galileon Lagrangian. We derive the scalar field profile for static spherically symmetric objects in asymptotically de Sitter space-time with a line... |
2007.14627 | Timothy C. Ralph | T.C.Ralph and Chris Chang | Spinning up a Time Machine | null | Phys. Rev. D, 102, 124013 (2020) | 10.1103/PhysRevD.102.124013 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a global metric describing closed timelike curves embedded in
Minkowski spacetime. Physically, the metric represents an Alcubierre warp drive
on a rotating platform. The physical realizability of such a metric is
uncertain due to the exotic matter required to produce it. Never-the-less we
suggest that this... | [
{
"created": "Wed, 29 Jul 2020 06:33:10 GMT",
"version": "v1"
}
] | 2020-12-04 | [
[
"Ralph",
"T. C.",
""
],
[
"Chang",
"Chris",
""
]
] | We present a global metric describing closed timelike curves embedded in Minkowski spacetime. Physically, the metric represents an Alcubierre warp drive on a rotating platform. The physical realizability of such a metric is uncertain due to the exotic matter required to produce it. Never-the-less we suggest that this m... |
1208.0061 | Yoelsy Leyva | Genly Leon, Yoelsy Leyva and J. Socorro | Quintom phase-space: beyond the exponential potential | 10 pages, 5 figures. References and a new section added. Minor typos
corrected. The current institution of one of the authors has been updated | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the phase-space structure of the quintom dark energy paradigm
in the framework of spatially flat and homogeneous universe. Considering
arbitrary decoupled potentials, we find certain general conditions under which
the phantom dominated solution is late time attractor, generalizing previous
results foun... | [
{
"created": "Wed, 1 Aug 2012 00:59:45 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Feb 2013 23:30:10 GMT",
"version": "v2"
}
] | 2013-02-27 | [
[
"Leon",
"Genly",
""
],
[
"Leyva",
"Yoelsy",
""
],
[
"Socorro",
"J.",
""
]
] | We investigate the phase-space structure of the quintom dark energy paradigm in the framework of spatially flat and homogeneous universe. Considering arbitrary decoupled potentials, we find certain general conditions under which the phantom dominated solution is late time attractor, generalizing previous results found ... |
2312.14995 | Matilde Serena Illy | Matilde Illy | Accelerated Reissner-Nordstrom black hole in a swirling, magnetic
universe | 52 pages, 18 figures, Thesis discussed on 13th December 2023 | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We present a new solution in Einstein's theory of relativity, found through
the use of the symmetries of the Ernst equations and in particular the Harrison
and Ehlers transformations. The new metric represents a Reissner-Nordstr\"om
black hole immersed in a magnetic, rotating universe. We analyse the physical
propert... | [
{
"created": "Fri, 22 Dec 2023 15:53:37 GMT",
"version": "v1"
}
] | 2023-12-27 | [
[
"Illy",
"Matilde",
""
]
] | We present a new solution in Einstein's theory of relativity, found through the use of the symmetries of the Ernst equations and in particular the Harrison and Ehlers transformations. The new metric represents a Reissner-Nordstr\"om black hole immersed in a magnetic, rotating universe. We analyse the physical propertie... |
2205.02433 | Che-Yu Chen | Che-Yu Chen, Hsu-Wen Chiang, Jie-Shiun Tsao | Eikonal quasinormal modes and photon orbits of deformed Schwarzschild
black holes | 17 pages, updated to match the published version | Phys. Rev. D 106 (2022) 044068 | 10.1103/PhysRevD.106.044068 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geometric optics approximation provides an interpretation for eikonal
correspondence that, in black-hole-containing spacetimes, connects
high-frequency black hole quasinormal modes with closed photon orbits around
said black hole. This correspondence has been identified explicitly for
Schwarzschild, Reissner-Nord... | [
{
"created": "Thu, 5 May 2022 04:25:28 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Aug 2022 14:12:13 GMT",
"version": "v2"
}
] | 2022-08-31 | [
[
"Chen",
"Che-Yu",
""
],
[
"Chiang",
"Hsu-Wen",
""
],
[
"Tsao",
"Jie-Shiun",
""
]
] | The geometric optics approximation provides an interpretation for eikonal correspondence that, in black-hole-containing spacetimes, connects high-frequency black hole quasinormal modes with closed photon orbits around said black hole. This correspondence has been identified explicitly for Schwarzschild, Reissner-Nordst... |
gr-qc/9610035 | Nils Andersson | Nils Andersson and Kostas D. Kokkotas | Gravitational waves and pulsating stars: What can we learn from future
observations? | Two ps-figures | Phys.Rev.Lett. 77 (1996) 4134-4137 | 10.1103/PhysRevLett.77.4134 | null | gr-qc | null | We present new results for pulsating stars in general relativity. First we
show that the so-called gravitational-wave modes of a neutron star can be
excited when a gravitational wave impinges on the star. Numerical simulations
suggest that the modes may be astrophysically relevant, and we discuss whether
they will be... | [
{
"created": "Wed, 16 Oct 1996 16:41:18 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Andersson",
"Nils",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | We present new results for pulsating stars in general relativity. First we show that the so-called gravitational-wave modes of a neutron star can be excited when a gravitational wave impinges on the star. Numerical simulations suggest that the modes may be astrophysically relevant, and we discuss whether they will be o... |
2004.08506 | Emilio Rub\'in de Celis | E. Rub\'in de Celis and C. Simeone | Electrostatics and self-force in asymptotically flat cylindrical
wormholes | 3 figures | Eur. Phys. J C (2020) 80: 501 | 10.1140/epjc/s10052-020-8063-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The problem of the electrostatics in conical wormholes is revisited, now
improving the background geometries with asymptotical flatness. The electric
self-force on a point charge placed at different regions in the spacetime of a
conical thin-shell wormhole connecting flat outer submanifolds is obtained and
compared w... | [
{
"created": "Sat, 18 Apr 2020 01:57:31 GMT",
"version": "v1"
}
] | 2020-06-17 | [
[
"de Celis",
"E. Rubín",
""
],
[
"Simeone",
"C.",
""
]
] | The problem of the electrostatics in conical wormholes is revisited, now improving the background geometries with asymptotical flatness. The electric self-force on a point charge placed at different regions in the spacetime of a conical thin-shell wormhole connecting flat outer submanifolds is obtained and compared wit... |
gr-qc/0212009 | Peter Huber | Peter Huber | A Cosmologic Model Based on the Equivalence of Expansion and Light
Retardation Part 2: Small-Scale Aspects and Quanta | 16 pages | null | null | null | gr-qc | null | Interpretation of the cosmological red shift as light retardation with the
amount of (d/dt)c = -Hc yields a photon rest mass hH/c^2. A system of natural
units is introduced, in which the Planck mass is the geometric average of the
photon rest mass and the universal mass. It is shown that the equivalence of
expansion ... | [
{
"created": "Mon, 2 Dec 2002 16:08:39 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Huber",
"Peter",
""
]
] | Interpretation of the cosmological red shift as light retardation with the amount of (d/dt)c = -Hc yields a photon rest mass hH/c^2. A system of natural units is introduced, in which the Planck mass is the geometric average of the photon rest mass and the universal mass. It is shown that the equivalence of expansion an... |
1508.02622 | Yorgo Senikoglu | Metin Arik and Yorgo Senikoglu | The Atmosphere of a Black Hole | 7 pages | Mod. Phys. Lett. A, Vol. 31, No. 5 (2016) 1650034 | 10.1142/S0217732316500346 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a static, isotropic fluid solution around a black hole and its
effects on the field equations and the horizon. We offer the solutions, their
descriptions and we comment on their shortcomings. We derive from the proposed
metric the density, the pressure, the equation of state, the temperature near
and far o... | [
{
"created": "Tue, 11 Aug 2015 15:03:08 GMT",
"version": "v1"
},
{
"created": "Fri, 18 Sep 2015 09:59:31 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Jan 2016 08:53:47 GMT",
"version": "v3"
}
] | 2016-01-27 | [
[
"Arik",
"Metin",
""
],
[
"Senikoglu",
"Yorgo",
""
]
] | We present a static, isotropic fluid solution around a black hole and its effects on the field equations and the horizon. We offer the solutions, their descriptions and we comment on their shortcomings. We derive from the proposed metric the density, the pressure, the equation of state, the temperature near and far of ... |
2201.00725 | Jia-Hui Huang | Jia-Hui Huang | No black hole bomb for D-dimensional extremal Reissner-Nordstrom black
holes under charged massive scalar perturbation | 47 pages,1 figure, references added | Eur. Phys. J. C 82, 467 (2022) | 10.1140/epjc/s10052-022-10423-9 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The superradiant stability of asymptotically flat D-dimensional extremal
Reissner-Nordstrom black holes under charged massive scalar perturbation is
analytically studied. Recently, an analytical method has been proposed by the
author and used to prove that five and six-dimensional extremal
Reissner-Nordstrom black ho... | [
{
"created": "Mon, 3 Jan 2022 15:58:48 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Jan 2022 08:04:47 GMT",
"version": "v2"
}
] | 2022-05-24 | [
[
"Huang",
"Jia-Hui",
""
]
] | The superradiant stability of asymptotically flat D-dimensional extremal Reissner-Nordstrom black holes under charged massive scalar perturbation is analytically studied. Recently, an analytical method has been proposed by the author and used to prove that five and six-dimensional extremal Reissner-Nordstrom black hole... |
gr-qc/0202041 | Pavlov | Yu. V. Pavlov | Creation of the Nonconformal Scalar Particles in Nonstationary Metric | LaTeX, 4 pages, no figures | Int.J.Mod.Phys. A17 (2002) 1041-1044 | 10.1142/S0217751X02010479 | null | gr-qc | null | The nonconformal scalar field is considered in N-dimensional space-time with
metric which includes, in particular, the cases of nonhomogeneous spaces and
anisotropic spaces of Bianchi type-I. The modified Hamiltonian is constructed.
Under the diagonalization of it the energy of quasiparticles is equal to the
oscillat... | [
{
"created": "Tue, 12 Feb 2002 12:28:02 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Pavlov",
"Yu. V.",
""
]
] | The nonconformal scalar field is considered in N-dimensional space-time with metric which includes, in particular, the cases of nonhomogeneous spaces and anisotropic spaces of Bianchi type-I. The modified Hamiltonian is constructed. Under the diagonalization of it the energy of quasiparticles is equal to the oscillator... |
1205.3773 | James Yearsley | J.J.Halliwell and J.M.Yearsley | Pitfalls of Path Integrals: Amplitudes for Spacetime Regions and the
Quantum Zeno Effect | 24 pages, 6 figures. Published version | Phys. Rev. D 86, 024016 (2012) | 10.1103/PhysRevD.86.024016 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Path integrals appear to offer natural and intuitively appealing methods for
defining quantum-mechanical amplitudes for questions involving spacetime
regions. For example, the amplitude for entering a spatial region during a
given time interval is typically defined by summing over all paths between
given initial and ... | [
{
"created": "Wed, 16 May 2012 19:56:47 GMT",
"version": "v1"
},
{
"created": "Tue, 29 May 2012 21:11:27 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Nov 2012 16:25:06 GMT",
"version": "v3"
}
] | 2015-06-05 | [
[
"Halliwell",
"J. J.",
""
],
[
"Yearsley",
"J. M.",
""
]
] | Path integrals appear to offer natural and intuitively appealing methods for defining quantum-mechanical amplitudes for questions involving spacetime regions. For example, the amplitude for entering a spatial region during a given time interval is typically defined by summing over all paths between given initial and fi... |
1110.6241 | Hayato Motohashi | Hayato Motohashi, Teruaki Suyama | Black hole perturbation in nondynamical and dynamical Chern-Simons
gravity | 18 pages; matches the published version in Phys. Rev. D | Phys. Rev. D 85, 044054 (2012) | 10.1103/PhysRevD.85.044054 | RESCEU-32/11 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Chern-Simons gravitational theories are extensions of general relativity in
which the parity is violated due to the Chern-Simons term. We study linear
perturbations on the static and spherically symmetric background spacetime both
for nondynamical and dynamical Chern-Simons theories. We do not make an
assumption that... | [
{
"created": "Fri, 28 Oct 2011 03:47:51 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Oct 2012 03:02:31 GMT",
"version": "v2"
}
] | 2012-10-15 | [
[
"Motohashi",
"Hayato",
""
],
[
"Suyama",
"Teruaki",
""
]
] | Chern-Simons gravitational theories are extensions of general relativity in which the parity is violated due to the Chern-Simons term. We study linear perturbations on the static and spherically symmetric background spacetime both for nondynamical and dynamical Chern-Simons theories. We do not make an assumption that t... |
2003.09098 | Zacharias Roupas | Zacharias Roupas | Gravitational potential from maximum entropy principle | Accepted in CQG | Classical & Quantum Gravity, 37 097001, (2020) | 10.1088/1361-6382/ab8144 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown here in the framework of standard General Relativity that the
gravitational potential in static spacetime, equivalently the redshift factor,
inside any kind of matter, can be derived from maximum entropy principle. It is
used only the Hamiltonian constraint, without further invoking Einstein's
equations o... | [
{
"created": "Fri, 20 Mar 2020 04:30:47 GMT",
"version": "v1"
}
] | 2020-04-15 | [
[
"Roupas",
"Zacharias",
""
]
] | It is shown here in the framework of standard General Relativity that the gravitational potential in static spacetime, equivalently the redshift factor, inside any kind of matter, can be derived from maximum entropy principle. It is used only the Hamiltonian constraint, without further invoking Einstein's equations or ... |
1004.2586 | Ralf Schutzhold | Ralf Sch\"utzhold | Emergent Horizons in the Laboratory | 7 pages, 4 figures | Class.Quant.Grav.25:114011,2008 | 10.1088/0264-9381/25/11/114011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concept of a horizon known from general relativity describes the loss of
causal connection and can be applied to non-gravitational scenarios such as
out-of-equilibrium condensed-matter systems in the laboratory. This analogy
facilitates the identification and theoretical study (e.g., regarding the
trans-Planckian... | [
{
"created": "Thu, 15 Apr 2010 09:30:51 GMT",
"version": "v1"
}
] | 2010-04-21 | [
[
"Schützhold",
"Ralf",
""
]
] | The concept of a horizon known from general relativity describes the loss of causal connection and can be applied to non-gravitational scenarios such as out-of-equilibrium condensed-matter systems in the laboratory. This analogy facilitates the identification and theoretical study (e.g., regarding the trans-Planckian p... |
gr-qc/0512046 | Dr Mayeul Arminjon | Mayeul Arminjon | Dirac equation from the Hamiltonian and the case with a gravitational
field | 27 pages, standard LaTeX. v2: minor style changes, accepted for
publication in Found. Phys. Letters | Found.Phys.Lett.19:225-247,2006 | 10.1007/s10702-006-0514-7 | null | gr-qc quant-ph | null | Starting from an interpretation of the classical-quantum correspondence, we
derive the Dirac equation by factorizing the algebraic relation satisfied by
the classical Hamiltonian, before applying the correspondence. This derivation
applies in the same form to a free particle, to one in an electromagnetic
field, and t... | [
{
"created": "Wed, 7 Dec 2005 14:44:00 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jan 2006 16:45:10 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Arminjon",
"Mayeul",
""
]
] | Starting from an interpretation of the classical-quantum correspondence, we derive the Dirac equation by factorizing the algebraic relation satisfied by the classical Hamiltonian, before applying the correspondence. This derivation applies in the same form to a free particle, to one in an electromagnetic field, and to ... |
2102.07806 | Spiros Cotsakis | Ignatios Antoniadis, Spiros Cotsakis | Geodesic incompleteness and partially covariant gravity | 16 pages | Universe 7(5) (2021) 126 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the issue of length renormalization in the context of fully
covariant gravity theories as well as non-relativistic ones such as
Ho\v{r}ava-Lifshitz gravity. The difference of their symmetry groups implies a
relation between the lengths of paths in spacetime in the two types of theory.
Provided that certain a... | [
{
"created": "Mon, 15 Feb 2021 19:21:56 GMT",
"version": "v1"
}
] | 2021-05-04 | [
[
"Antoniadis",
"Ignatios",
""
],
[
"Cotsakis",
"Spiros",
""
]
] | We study the issue of length renormalization in the context of fully covariant gravity theories as well as non-relativistic ones such as Ho\v{r}ava-Lifshitz gravity. The difference of their symmetry groups implies a relation between the lengths of paths in spacetime in the two types of theory. Provided that certain asy... |
gr-qc/0409036 | Florian Conrady | Florian Conrady (CPT, Marseille & Potsdam, Max Planck Inst.) | Free vacuum for loop quantum gravity | 30 pages, 3 diagrams, treatment of phase factor added | Class.Quant.Grav. 22 (2005) 3261-3293 | 10.1088/0264-9381/22/16/010 | AEI-2003-073 | gr-qc | null | We linearize extended ADM-gravity around the flat torus, and use the
associated Fock vacuum to construct a state that could play the role of a free
vacuum in loop quantum gravity. The state we obtain is an element of the
gauge-invariant kinematic Hilbert space and restricted to a cutoff graph, as a
natural consequenc... | [
{
"created": "Wed, 8 Sep 2004 08:59:46 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Apr 2005 09:19:55 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Conrady",
"Florian",
"",
"CPT, Marseille & Potsdam, Max Planck Inst."
]
] | We linearize extended ADM-gravity around the flat torus, and use the associated Fock vacuum to construct a state that could play the role of a free vacuum in loop quantum gravity. The state we obtain is an element of the gauge-invariant kinematic Hilbert space and restricted to a cutoff graph, as a natural consequence ... |
1602.03857 | Larry Ford | C.H.G. Bessa, V.A. De Lorenci, L.H. Ford, and C.C.H. Ribeiro | A Model for Lightcone Fluctuations due to Stress Tensor Fluctuations | 9 pages, 2 figures | Phys. Rev. D 93, 064067 (2016) | 10.1103/PhysRevD.93.064067 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a model for quantum lightcone fluctuations in which vacuum
fluctuations of the electric field and of the squared electric field in a
nonlinear dielectric material produce variations in the flight times of probe
pulses. When this material has a non-zero third order polarizability, the
flight time variations a... | [
{
"created": "Thu, 11 Feb 2016 19:53:04 GMT",
"version": "v1"
}
] | 2016-04-06 | [
[
"Bessa",
"C. H. G.",
""
],
[
"De Lorenci",
"V. A.",
""
],
[
"Ford",
"L. H.",
""
],
[
"Ribeiro",
"C. C. H.",
""
]
] | We study a model for quantum lightcone fluctuations in which vacuum fluctuations of the electric field and of the squared electric field in a nonlinear dielectric material produce variations in the flight times of probe pulses. When this material has a non-zero third order polarizability, the flight time variations ari... |
2405.03554 | Hongguang Liu | Kristina Giesel, Hongguang Liu, Parampreet Singh, Stefan Andreas Weigl | Regular black holes and their relationship to polymerized models and
mimetic gravity | 42 pages, 7 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present further applications of the formalism introduced by the authors in
arXiv:2308.10949, which allows embedding of a broad class of generalized LTB
models into effective spherically symmetric spacetimes. We focus on regular
black hole models, where a broad class of models can be considered, including
for examp... | [
{
"created": "Mon, 6 May 2024 15:21:22 GMT",
"version": "v1"
}
] | 2024-05-07 | [
[
"Giesel",
"Kristina",
""
],
[
"Liu",
"Hongguang",
""
],
[
"Singh",
"Parampreet",
""
],
[
"Weigl",
"Stefan Andreas",
""
]
] | We present further applications of the formalism introduced by the authors in arXiv:2308.10949, which allows embedding of a broad class of generalized LTB models into effective spherically symmetric spacetimes. We focus on regular black hole models, where a broad class of models can be considered, including for example... |
1209.2972 | Paolo Pani | Paolo Pani, Thomas P. Sotiriou | Surface singularities in Eddington-inspired Born-Infeld gravity | 5 pages. v2: minor corrections to match published version | Phys. Rev. Lett. 109, 251102 (2012) | 10.1103/PhysRevLett.109.251102 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Eddington-inspired Born-Infeld gravity was recently proposed as an
alternative to general relativity that offers a resolution of spacetime
singularities. The theory differs from Einstein's gravity only inside matter
due to nondynamical degrees of freedom, and it is compatible with all current
observations. We show th... | [
{
"created": "Thu, 13 Sep 2012 17:36:27 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Dec 2012 12:33:20 GMT",
"version": "v2"
}
] | 2013-01-01 | [
[
"Pani",
"Paolo",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | Eddington-inspired Born-Infeld gravity was recently proposed as an alternative to general relativity that offers a resolution of spacetime singularities. The theory differs from Einstein's gravity only inside matter due to nondynamical degrees of freedom, and it is compatible with all current observations. We show that... |
0905.0073 | Alfredo Lopez Ortega | A. L\'opez-Ortega | Quasinormal modes and stability of a five-dimensional dilatonic black
hole | 14 pages, 2 figures. IJMPD accepted | Int.J.Mod.Phys.D18:1441-1459,2009 | 10.1142/S0218271809015199 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We exactly calculate the quasinormal frequencies of the electromagnetic and
Klein-Gordon perturbations propagating in a five-dimensional dilatonic black
hole. Furthermore we exactly find the quasinormal frequencies of the massive
Dirac field. Using these results we study the linear stability of this black
hole. We co... | [
{
"created": "Fri, 1 May 2009 10:31:14 GMT",
"version": "v1"
}
] | 2010-01-26 | [
[
"López-Ortega",
"A.",
""
]
] | We exactly calculate the quasinormal frequencies of the electromagnetic and Klein-Gordon perturbations propagating in a five-dimensional dilatonic black hole. Furthermore we exactly find the quasinormal frequencies of the massive Dirac field. Using these results we study the linear stability of this black hole. We comp... |
2404.04519 | Andronikos Paliathanasis | Andronikos Paliathanasis | $f(R,\square R)$-gravity and equivalency with the modified GUP Scalar
field models | 22 pages, 2 figures, to appear in Eur. Phys. J. C | null | null | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | Inspired by the generalization of scalar field gravitational models with a
minimum length we study the equivalent theory in modified theories of gravity.
The quadratic Generalized Uncertainty Principle (GUP) gives rise to a deformed
Heisenberg algebra in the application, resulting in the emergence of additional
degre... | [
{
"created": "Sat, 6 Apr 2024 06:18:41 GMT",
"version": "v1"
}
] | 2024-04-09 | [
[
"Paliathanasis",
"Andronikos",
""
]
] | Inspired by the generalization of scalar field gravitational models with a minimum length we study the equivalent theory in modified theories of gravity. The quadratic Generalized Uncertainty Principle (GUP) gives rise to a deformed Heisenberg algebra in the application, resulting in the emergence of additional degrees... |
1904.06553 | Zahra Mirzaiyan | Hamideh Nadi, Behrouz Mirza, Zahra Mirzaiyan | Electromagnetic self-force in the five dimensional Myers-Perry space
time | 7 pages, 2 figures | Annals of Physics 406 (2019) 142-151 | 10.1016/j.aop.2019.04.008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the effects of the electromagnetic self-force on a charged
particle outside a five dimensional Myers-Perry space-time. Based on our
earlier work [1], we obtain the self-force using quaternions in Janis-Newman
and Giampieri algorithms. In four dimensional rotating space-time the
electromagnetic self-force... | [
{
"created": "Sat, 13 Apr 2019 14:10:19 GMT",
"version": "v1"
}
] | 2019-06-18 | [
[
"Nadi",
"Hamideh",
""
],
[
"Mirza",
"Behrouz",
""
],
[
"Mirzaiyan",
"Zahra",
""
]
] | We calculate the effects of the electromagnetic self-force on a charged particle outside a five dimensional Myers-Perry space-time. Based on our earlier work [1], we obtain the self-force using quaternions in Janis-Newman and Giampieri algorithms. In four dimensional rotating space-time the electromagnetic self-force i... |
gr-qc/9810076 | Igor Kanatczikow | I.V. Kanatchikov | From the DeDonder-Weyl Hamiltonian formalism to quantization of Gravity | 10pp, LaTeX, uses sprocl.sty. To appear in the Proceedings of the
International Seminar on Mathematical Cosmology, Potsdam, Mar-Apr 98, ed.
H.-J. Schmidt and M. Rainer, World Scientific, Singapore 1998 | null | null | null | gr-qc | null | An approach to quantization of fields and gravity based on the De Donder-Weyl
covariant Hamiltonian formalism is outlined. It leads to a hypercomplex
extension of quantum mechanics in which the algebra of complex numbers is
replaced by the space-time Clifford algebra and all space-time variables enter
on equal footin... | [
{
"created": "Thu, 22 Oct 1998 21:06:32 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kanatchikov",
"I. V.",
""
]
] | An approach to quantization of fields and gravity based on the De Donder-Weyl covariant Hamiltonian formalism is outlined. It leads to a hypercomplex extension of quantum mechanics in which the algebra of complex numbers is replaced by the space-time Clifford algebra and all space-time variables enter on equal footing.... |
1702.05580 | Jorge Ovalle | J Ovalle, R Casadio, A Sotomayor | Searching for modified gravity: a conformal sector? | Based on the contributed lecture given at the IF-YITP Cosmo
International Symposium. Phitsanulok, Thailand, August 3-5, 2016 | Journal of Physics: Conf. Series 883 (2017) 012004 | 10.1088/1742-6596/883/1/012004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We conjecture that any modification of general relativity can be studied by
the minimal geometric deformation approach provided that such modification can
be represented by a traceless energy-momentum tensor.
| [
{
"created": "Sat, 18 Feb 2017 07:20:55 GMT",
"version": "v1"
}
] | 2017-08-30 | [
[
"Ovalle",
"J",
""
],
[
"Casadio",
"R",
""
],
[
"Sotomayor",
"A",
""
]
] | We conjecture that any modification of general relativity can be studied by the minimal geometric deformation approach provided that such modification can be represented by a traceless energy-momentum tensor. |
1207.5854 | J\"org Frauendiener | Florian Beyer and Georgios Doulis and J\"org Frauendiener and Ben
Whale | Numerical space-times near space-like and null infinity. The spin-2
system on Minkowski space | 28 pages, 7 figures, final version as published in Class. Quant. Grav | Class. Quantum Grav. 29 (2012) 245013 | 10.1088/0264-9381/29/24/245013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we demonstrate for the first time that it is possible to solve
numerically the Cauchy problem for the linearisation of the general conformal
field equations near spacelike infinity, which is only well-defined in
Friedrich's cylinder picture. We have restricted ourselves here to the "core"
of the equatio... | [
{
"created": "Tue, 24 Jul 2012 23:58:53 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Dec 2012 21:20:47 GMT",
"version": "v2"
}
] | 2012-12-05 | [
[
"Beyer",
"Florian",
""
],
[
"Doulis",
"Georgios",
""
],
[
"Frauendiener",
"Jörg",
""
],
[
"Whale",
"Ben",
""
]
] | In this paper we demonstrate for the first time that it is possible to solve numerically the Cauchy problem for the linearisation of the general conformal field equations near spacelike infinity, which is only well-defined in Friedrich's cylinder picture. We have restricted ourselves here to the "core" of the equations... |
1207.0377 | Bruno Boisseau | Bruno Boisseau, Bernard Linet | Electrostatics in a simple wormhole revisited | 16 pages, no figures | null | 10.1007/s10714-013-1504-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The electrostatic potential generated by a point charge at rest in a simple
static, spherically symmetric wormhole is given in the form of series of
multipoles and in closed form. The general potential which is physically
acceptable depends on a parameter due to the fact that the monopole solution is
arbitrary. When ... | [
{
"created": "Mon, 2 Jul 2012 13:32:38 GMT",
"version": "v1"
}
] | 2015-06-05 | [
[
"Boisseau",
"Bruno",
""
],
[
"Linet",
"Bernard",
""
]
] | The electrostatic potential generated by a point charge at rest in a simple static, spherically symmetric wormhole is given in the form of series of multipoles and in closed form. The general potential which is physically acceptable depends on a parameter due to the fact that the monopole solution is arbitrary. When th... |
gr-qc/0004064 | Sergei M. Kopeikin | Sergei M. Kopeikin (University of Missouri-Columbia), Carl R. Gwinn
(University of California at Santa Barbara) | Sub-Microarcsecond Astrometry and New Horizons in Relativistic
Gravitational Physics | 5 pages, the talk given at the IAU Colloquium 180 "Towards Models and
Constants for Sub-Microarcsecond Astrometry", Washington DC, March 26 - April
2, 2000 | null | null | null | gr-qc | null | Attaining the limit of sub-microarcsecond optical resolution will completely
revolutionize fundamental astrometry by merging it with relativistic
gravitational physics. Beyond the sub-microarcsecond threshold, one will meet
in the sky a new population of physical phenomena caused by primordial
gravitational waves fro... | [
{
"created": "Wed, 19 Apr 2000 21:15:56 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kopeikin",
"Sergei M.",
"",
"University of Missouri-Columbia"
],
[
"Gwinn",
"Carl R.",
"",
"University of California at Santa Barbara"
]
] | Attaining the limit of sub-microarcsecond optical resolution will completely revolutionize fundamental astrometry by merging it with relativistic gravitational physics. Beyond the sub-microarcsecond threshold, one will meet in the sky a new population of physical phenomena caused by primordial gravitational waves from ... |
1202.3573 | Luca Fabbri | Salvatore Capozziello, Mariafelicia De Laurentis, Luca Fabbri, Stefano
Vignolo | Running coupling in electroweak interactions of leptons from
f(R)-gravity with torsion | 9 pages. arXiv admin note: text overlap with arXiv:1012.5529 by other
authors | Eur.Phys.J.C72:1908-1918,2012 | 10.1140/epjc/s10052-012-1908-2 | null | gr-qc astro-ph.EP hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The f(R)-gravitational theory with torsion is considered for one family of
leptons; it is found that the torsion tensor gives rise to interactions having
the structure of the weak forces while the intrinsic non-linearity of the f(R)
function provides an energy-dependent coupling: in this way, torsional f(R)
gravity n... | [
{
"created": "Thu, 16 Feb 2012 12:30:04 GMT",
"version": "v1"
}
] | 2012-02-29 | [
[
"Capozziello",
"Salvatore",
""
],
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Fabbri",
"Luca",
""
],
[
"Vignolo",
"Stefano",
""
]
] | The f(R)-gravitational theory with torsion is considered for one family of leptons; it is found that the torsion tensor gives rise to interactions having the structure of the weak forces while the intrinsic non-linearity of the f(R) function provides an energy-dependent coupling: in this way, torsional f(R) gravity nat... |
2107.05345 | Koray D\"uzta\c{s} | Koray D\"uzta\c{s} | Cosmic censorship, massless fermionic test fields, and absorption
probabilities | "massless" added to the title. Published in EPJC | Eur. Phys. J. C (2021) 81:1131 | 10.1140/epjc/s10052-021-09937-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the conventional approach, fermionic test fields lead to a generic
overspinning of black holes resulting in the formation of naked singularities.
The absorption of the fermionic test fields with arbitrarily low frequencies is
allowed for which the contribution to the angular momentum parameter of the
space-time di... | [
{
"created": "Mon, 12 Jul 2021 12:11:23 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Dec 2021 09:07:19 GMT",
"version": "v2"
}
] | 2021-12-28 | [
[
"Düztaş",
"Koray",
""
]
] | In the conventional approach, fermionic test fields lead to a generic overspinning of black holes resulting in the formation of naked singularities. The absorption of the fermionic test fields with arbitrarily low frequencies is allowed for which the contribution to the angular momentum parameter of the space-time dive... |
1111.2071 | Mariafelicia De Laurentis | Mariafelicia De Laurentis | From Clifton-Barrow spherically symmetric to axially symmetric solution
in f(R)-gravity | 5 pages. arXiv admin note: substantial text overlap with
arXiv:0912.5286 | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from Clifton's spherical static solution for f(R)-gravity we can
derive axial symmetric solutions using a methods that takes the advantage of a
complex coordinate transformation. The new solutions are generated by applying
the Newman-Janis algorithm previously used to transform any static spherically
symmetr... | [
{
"created": "Tue, 8 Nov 2011 22:15:15 GMT",
"version": "v1"
}
] | 2011-11-10 | [
[
"De Laurentis",
"Mariafelicia",
""
]
] | Starting from Clifton's spherical static solution for f(R)-gravity we can derive axial symmetric solutions using a methods that takes the advantage of a complex coordinate transformation. The new solutions are generated by applying the Newman-Janis algorithm previously used to transform any static spherically symmetric... |
2304.08287 | Jean-Baptiste Bayle | Waldemar Martens, Michael Khan, Jean-Baptiste Bayle | LISAmax: Improving the Low-Frequency Gravitational-Wave Sensitivity by
Two Orders of Magnitude | 20 pages, 11 figures, 3 tables | null | null | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | Within its Voyage 2050 planning cycle, the European Space Agency (ESA) is
considering long-term large class science mission themes. Gravitational-wave
astronomy is among the topics under study. Building on previous work by other
authors, this paper studies a gravitational-wave interferometer concept, dubbed
"LISAmax"... | [
{
"created": "Mon, 17 Apr 2023 13:58:21 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Aug 2023 08:37:50 GMT",
"version": "v2"
}
] | 2023-08-28 | [
[
"Martens",
"Waldemar",
""
],
[
"Khan",
"Michael",
""
],
[
"Bayle",
"Jean-Baptiste",
""
]
] | Within its Voyage 2050 planning cycle, the European Space Agency (ESA) is considering long-term large class science mission themes. Gravitational-wave astronomy is among the topics under study. Building on previous work by other authors, this paper studies a gravitational-wave interferometer concept, dubbed "LISAmax", ... |
1206.5942 | Mariam Bouhmadi-Lopez | Mariam Bouhmadi-Lopez, Pisin Chen, Yen-Wei Liu | Scalar perturbations from brane-world inflation with curvature effects | 13 pages, 8 figures. RevTex4-1. Comments and references added.
Version accepted in PRD | null | 10.1103/PhysRevD.86.083531 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a generalization of the Randall-Sundrum single brane-world
scenario (RS2). More precisely, the generalization is described through
curvature corrections, corresponding to a Gauss-Bonnet term in the bulk and a
Hilbert-Einstein term, as well as the strength of the induced gravity term, on
the brane. We are ... | [
{
"created": "Tue, 26 Jun 2012 10:19:43 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Sep 2012 13:11:56 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Bouhmadi-Lopez",
"Mariam",
""
],
[
"Chen",
"Pisin",
""
],
[
"Liu",
"Yen-Wei",
""
]
] | We consider a generalization of the Randall-Sundrum single brane-world scenario (RS2). More precisely, the generalization is described through curvature corrections, corresponding to a Gauss-Bonnet term in the bulk and a Hilbert-Einstein term, as well as the strength of the induced gravity term, on the brane. We are ma... |
2408.06407 | Nosratollah Jafari Sonbolabadi | Nosratollah Jafari | DSR, Optics and Electrodynamics | 6 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We investigate some interesting solutions in the DSR theories. These
solutions have important features in optics and mechanics. We use these
similarities for a better understanding of these theories. We know that, the
vacuum in the DSR has an effective refractive index which depends on the
frequency of the light. We ... | [
{
"created": "Mon, 12 Aug 2024 17:55:37 GMT",
"version": "v1"
}
] | 2024-08-14 | [
[
"Jafari",
"Nosratollah",
""
]
] | We investigate some interesting solutions in the DSR theories. These solutions have important features in optics and mechanics. We use these similarities for a better understanding of these theories. We know that, the vacuum in the DSR has an effective refractive index which depends on the frequency of the light. We fi... |
1812.04257 | Yan Peng | Yan Peng | Upper bound on the radii of regular ultra-compact star photonspheres | 8 pages | Physics Letters B 790(2019)396-399 | 10.1016/j.physletb.2019.01.049 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the photonsphere in the background of regular asymptotically
flat compact stars. The analysis includes the general hairy compact star
considering the matter fields' backreaction on the metric in various gravity
theories. We prove that the photonsphere of the compact star has an upper bound
expressed in... | [
{
"created": "Tue, 11 Dec 2018 08:10:47 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jan 2019 23:56:34 GMT",
"version": "v2"
}
] | 2019-02-04 | [
[
"Peng",
"Yan",
""
]
] | We investigate the photonsphere in the background of regular asymptotically flat compact stars. The analysis includes the general hairy compact star considering the matter fields' backreaction on the metric in various gravity theories. We prove that the photonsphere of the compact star has an upper bound expressed in t... |
gr-qc/0504016 | Dr Mayeul Arminjon | Mayeul Arminjon | Equations of motion according to the asymptotic post-Newtonian scheme
for general relativity in the harmonic gauge | 42 pages, no figure. Version accepted for publication in Physical
Review D | Phys.Rev. D72 (2005) 084002 | 10.1103/PhysRevD.72.084002 | null | gr-qc astro-ph | null | The asymptotic scheme of post-Newtonian approximation defined for general
relativity (GR) in the harmonic gauge by Futamase & Schutz (1983) is based on a
family of initial data for the matter fields of a perfect fluid and for the
initial metric, defining a family of weakly self-gravitating systems. We show
that Weinb... | [
{
"created": "Tue, 5 Apr 2005 15:23:30 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Sep 2005 07:34:49 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Arminjon",
"Mayeul",
""
]
] | The asymptotic scheme of post-Newtonian approximation defined for general relativity (GR) in the harmonic gauge by Futamase & Schutz (1983) is based on a family of initial data for the matter fields of a perfect fluid and for the initial metric, defining a family of weakly self-gravitating systems. We show that Weinber... |
gr-qc/0111090 | Frans Klinkhamer | F.R. Klinkhamer | Fundamental time asymmetry from nontrivial space topology | 9 pages, REVTeX, v5: version published | Phys.Rev. D66 (2002) 047701 | 10.1103/PhysRevD.66.047701 | KA-TP-32-2001 | gr-qc hep-ph hep-th | null | It is argued that a fundamental time asymmetry could arise from the global
structure of the space manifold. The proposed mechanism relies on the CPT
anomaly of certain chiral gauge theories defined over a multiply connected
space manifold. The resulting time asymmetry (microscopic arrow of time) is
illustrated by a s... | [
{
"created": "Mon, 26 Nov 2001 17:23:42 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Nov 2001 22:29:32 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Dec 2001 18:26:06 GMT",
"version": "v3"
},
{
"created": "Mon, 15 Apr 2002 15:15:49 GMT",
"version": "v4"
},
{
"cr... | 2009-11-07 | [
[
"Klinkhamer",
"F. R.",
""
]
] | It is argued that a fundamental time asymmetry could arise from the global structure of the space manifold. The proposed mechanism relies on the CPT anomaly of certain chiral gauge theories defined over a multiply connected space manifold. The resulting time asymmetry (microscopic arrow of time) is illustrated by a sim... |
gr-qc/0110119 | Tiberiu Harko | M. K. Mak, J. A. Belinchon, T. Harko | Causal Bulk Viscous Dissipative Isotropic Cosmologies with Variable
Gravitational and Cosmological Constants | 14 pages, 15 figures | Int.J.Mod.Phys.D11:1265-1284,2002 | 10.1142/S0218271802002232 | null | gr-qc | null | We consider the evolution of a flat Friedmann-Robertson-Walker Universe,
filled with a causal bulk viscous cosmological fluid, in the presence of
variable gravitational and cosmological constants. The basic equation for the
Hubble parameter, generalizing the evolution equation in the case of constant
gravitational co... | [
{
"created": "Mon, 29 Oct 2001 05:10:51 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mak",
"M. K.",
""
],
[
"Belinchon",
"J. A.",
""
],
[
"Harko",
"T.",
""
]
] | We consider the evolution of a flat Friedmann-Robertson-Walker Universe, filled with a causal bulk viscous cosmological fluid, in the presence of variable gravitational and cosmological constants. The basic equation for the Hubble parameter, generalizing the evolution equation in the case of constant gravitational coup... |
1010.4966 | Khaled Saaidi | Kh. Saaidi, H. Hossienkhani | Gravitational Baryogenesis in Anisotropic Universe | 12 pages, no figure | Astrophys. Space Sci. 333 (2011) 305 | 10.1007/s10509-010-0580-y | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The interaction between Ricci scalar curvature and the baryon number current,
dynamically breaks CPT in an expanding universe and leads to baryon asymmetry.
Using this kind of interaction and study the gravitational baryogenesis in the
Bianchi type I universe. We find out the effect of anisotropy of the universe
on t... | [
{
"created": "Sun, 24 Oct 2010 14:32:27 GMT",
"version": "v1"
}
] | 2014-01-20 | [
[
"Saaidi",
"Kh.",
""
],
[
"Hossienkhani",
"H.",
""
]
] | The interaction between Ricci scalar curvature and the baryon number current, dynamically breaks CPT in an expanding universe and leads to baryon asymmetry. Using this kind of interaction and study the gravitational baryogenesis in the Bianchi type I universe. We find out the effect of anisotropy of the universe on the... |
2310.05860 | Saeed Ullah Khan | Saeed Ullah Khan, Javlon Rayimbaev, Furkat Sarikulov, Ozodbek
Abdurakhmonov | Optical features of rotating quintessential charged black holes in
de-Sitter spacetime | 18 pages, 11 figures | Chinese Journal of Physics, June (2024) | 10.1016/j.cjph.2024.05.050 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | One of the most important and actual issues in relativistic astrophysics is
testing gravity theories and obtaining constraint values for the parameters of
black holes using observational data. In this research, we aimed to explore the
optical features of a Kerr--Newman black hole model in the presence of a
quintessen... | [
{
"created": "Mon, 9 Oct 2023 16:54:08 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Apr 2024 05:36:31 GMT",
"version": "v2"
},
{
"created": "Thu, 13 Jun 2024 04:43:38 GMT",
"version": "v3"
}
] | 2024-06-14 | [
[
"Khan",
"Saeed Ullah",
""
],
[
"Rayimbaev",
"Javlon",
""
],
[
"Sarikulov",
"Furkat",
""
],
[
"Abdurakhmonov",
"Ozodbek",
""
]
] | One of the most important and actual issues in relativistic astrophysics is testing gravity theories and obtaining constraint values for the parameters of black holes using observational data. In this research, we aimed to explore the optical features of a Kerr--Newman black hole model in the presence of a quintessenti... |
1407.7656 | Badri Krishnan | Miriam Cabero and Badri Krishnan | Tidal deformations of spinning black holes in Bowen-York initial data | 22 pages, 1 figure | null | 10.1088/0264-9381/32/4/045009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the tidal deformations of the shape of a spinning black hole horizon
due to a binary companion in the Bowen-York initial data set. We use the
framework of quasi-local horizons and identify a black hole by marginally outer
trapped surfaces. The intrinsic horizon geometry is specified by a set of mass
and angu... | [
{
"created": "Tue, 29 Jul 2014 08:02:15 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Cabero",
"Miriam",
""
],
[
"Krishnan",
"Badri",
""
]
] | We study the tidal deformations of the shape of a spinning black hole horizon due to a binary companion in the Bowen-York initial data set. We use the framework of quasi-local horizons and identify a black hole by marginally outer trapped surfaces. The intrinsic horizon geometry is specified by a set of mass and angula... |
2009.03627 | Bekir Can L\"utf\"uo\u{g}lu | Hassan Hassanabadi, Nasrin Farahani, Won Sang Chung and Bekir Can
L\"utf\"uo\u{g}lu | Investigation of Unruh temperature of Black holes by using of EGUP
formalism | null | EPL(Europhysics Letters) 130, (2020), 40001 | 10.1209/0295-5075/130/40001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have used the extended generalized uncertainty principle to
investigate the Unruh temperature and thermodynamic properties of a black hole.
We started with a brief perusal of the Heisenberg uncertainty principle and
continue with some physical and mathematical discussion for obtaining the
generalize... | [
{
"created": "Tue, 8 Sep 2020 10:17:43 GMT",
"version": "v1"
}
] | 2020-09-09 | [
[
"Hassanabadi",
"Hassan",
""
],
[
"Farahani",
"Nasrin",
""
],
[
"Chung",
"Won Sang",
""
],
[
"Lütfüoğlu",
"Bekir Can",
""
]
] | In this paper, we have used the extended generalized uncertainty principle to investigate the Unruh temperature and thermodynamic properties of a black hole. We started with a brief perusal of the Heisenberg uncertainty principle and continue with some physical and mathematical discussion for obtaining the generalized ... |
gr-qc/0302015 | Sanjeev S. Seahra | Sanjeev S. Seahra and Paul S. Wesson | Application of the Campbell-Magaard theorem to higher-dimensional
physics | Typos corrected, 13 pages, no figures, two column format | Class.Quant.Grav.20:1321-1340,2003 | 10.1088/0264-9381/20/7/306 | null | gr-qc hep-th | null | Stated succinctly, the original version of the Campbell-Magaard theorem says
that it is always possible to locally embed any solution of 4-dimensional
general relativity in a 5-dimensional Ricci-flat manifold. We discuss the proof
of this theorem (and its variants) in n dimensions, and its application to
current theo... | [
{
"created": "Wed, 5 Feb 2003 18:16:32 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Feb 2003 17:28:00 GMT",
"version": "v2"
},
{
"created": "Tue, 25 Feb 2003 18:05:30 GMT",
"version": "v3"
},
{
"created": "Thu, 10 Apr 2003 15:53:21 GMT",
"version": "v4"
}
] | 2016-08-31 | [
[
"Seahra",
"Sanjeev S.",
""
],
[
"Wesson",
"Paul S.",
""
]
] | Stated succinctly, the original version of the Campbell-Magaard theorem says that it is always possible to locally embed any solution of 4-dimensional general relativity in a 5-dimensional Ricci-flat manifold. We discuss the proof of this theorem (and its variants) in n dimensions, and its application to current theori... |
2008.12121 | Wu-Sheng Dai | Yu-Jie Chen, Shi-Lin Li, Yu-Zhu Chen, Wen-Du Li, and Wu-Sheng Dai | Quantum correction of gravitational constant | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest a scheme for considering the quantum correction of the
gravitational constant. In the model, the gravitational constant originates
from a coupling of the gravitational field with a scalar field. In this paper,
we show that if the scalar field, as it should be in the real physical world,
is a quantum field,... | [
{
"created": "Wed, 26 Aug 2020 17:16:44 GMT",
"version": "v1"
},
{
"created": "Mon, 10 May 2021 15:10:46 GMT",
"version": "v2"
}
] | 2021-05-11 | [
[
"Chen",
"Yu-Jie",
""
],
[
"Li",
"Shi-Lin",
""
],
[
"Chen",
"Yu-Zhu",
""
],
[
"Li",
"Wen-Du",
""
],
[
"Dai",
"Wu-Sheng",
""
]
] | We suggest a scheme for considering the quantum correction of the gravitational constant. In the model, the gravitational constant originates from a coupling of the gravitational field with a scalar field. In this paper, we show that if the scalar field, as it should be in the real physical world, is a quantum field, t... |
0812.4516 | Edisom S. Moreira jr | Vitorio A. De Lorenci, Edisom S. Moreira Jr. (Itajuba' Federal U.) | Semiclassical backreaction around a nearly spinning cosmic string | 6 pages, no figures, REVTeX4 file. This version provides a clearer
discussion stressing that the ergoregion is a coordinate independent effect.
Misleading sentences regarding this matter are amended | Phys. Lett. B 679 (2009) 510-514 | 10.1016/j.physletb.2009.08.019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper investigates semiclassical backreaction of a conformally coupled
massless scalar field on the geometrical background of a nearly spinning cosmic
string - the spin density is smaller than, but arbitrarily close to, the
dislocation parameter. As the spin density approaches the dislocation
parameter, it is sh... | [
{
"created": "Wed, 24 Dec 2008 10:54:34 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jul 2009 12:11:59 GMT",
"version": "v2"
}
] | 2013-04-25 | [
[
"De Lorenci",
"Vitorio A.",
"",
"Itajuba' Federal U."
],
[
"Moreira",
"Edisom S.",
"Jr.",
"Itajuba' Federal U."
]
] | This paper investigates semiclassical backreaction of a conformally coupled massless scalar field on the geometrical background of a nearly spinning cosmic string - the spin density is smaller than, but arbitrarily close to, the dislocation parameter. As the spin density approaches the dislocation parameter, it is show... |
2311.14637 | Francesco Fucito | Francesco Fucito and Jose Francisco Morales | Post Newtonian emission of gravitational waves from binary systems: a
gauge theory perspective | 29 pages, few notations changed hoping to make the paper more
readable. few typos corrected. version to appear in JHEP | null | null | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | We derive a gauge inspired combinatorial formula based on localization for
the Post-Newtonian expansion of the gravitational wave form luminosity of
binary systems made of objects with very different masses orbiting at large
distances and small velocities. The results are tested against previous
formulae in the liter... | [
{
"created": "Fri, 24 Nov 2023 18:09:25 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Dec 2023 18:08:36 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Feb 2024 11:02:52 GMT",
"version": "v3"
}
] | 2024-02-22 | [
[
"Fucito",
"Francesco",
""
],
[
"Morales",
"Jose Francisco",
""
]
] | We derive a gauge inspired combinatorial formula based on localization for the Post-Newtonian expansion of the gravitational wave form luminosity of binary systems made of objects with very different masses orbiting at large distances and small velocities. The results are tested against previous formulae in the literat... |
2104.03980 | Thomas W. Baumgarte | Maria F. Perez Mendoza and Thomas W. Baumgarte | Critical phenomena in the gravitational collapse of electromagnetic
dipole and quadrupole waves | 14 pages, 9 figures; version accepted for publication in PRD | Phys. Rev. D 103, 124048 (2021) | 10.1103/PhysRevD.103.124048 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We report on critical phenomena in the gravitational collapse of
electromagnetic waves. Generalizing earlier results that focused on dipole
electromagnetic waves, we here compare with quadrupole waves in axisymmetry. We
perform numerical simulations of dipole and quadrupole wave initial data,
fine-tuning both sets of... | [
{
"created": "Thu, 8 Apr 2021 18:00:04 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Jun 2021 18:47:03 GMT",
"version": "v2"
}
] | 2021-06-30 | [
[
"Mendoza",
"Maria F. Perez",
""
],
[
"Baumgarte",
"Thomas W.",
""
]
] | We report on critical phenomena in the gravitational collapse of electromagnetic waves. Generalizing earlier results that focused on dipole electromagnetic waves, we here compare with quadrupole waves in axisymmetry. We perform numerical simulations of dipole and quadrupole wave initial data, fine-tuning both sets of d... |
1210.2834 | Donato Bini | Donato Bini and Thibault Damour | Gravitational radiation reaction along general orbits in the effective
one-body formalism | 43 pages, revtex macros used | null | 10.1103/PhysRevD.86.124012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the gravitational radiation-reaction force modifying the Effective
One Body (EOB) description of the conservative dynamics of binary systems. Our
result is applicable to general orbits (elliptic or hyperbolic) and keeps terms
of fractional second post-Newtonian order (but does not include tail effects).
Our... | [
{
"created": "Wed, 10 Oct 2012 08:44:33 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Bini",
"Donato",
""
],
[
"Damour",
"Thibault",
""
]
] | We derive the gravitational radiation-reaction force modifying the Effective One Body (EOB) description of the conservative dynamics of binary systems. Our result is applicable to general orbits (elliptic or hyperbolic) and keeps terms of fractional second post-Newtonian order (but does not include tail effects). Our d... |
2104.05803 | Wolfgang Wieland | Wolfgang Wieland | Gravitational $SL(2,\mathbb{R})$ Algebra on the Light Cone | 29 pages | null | 10.1007/JHEP07(2021)057 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In a region with a boundary, the gravitational phase space consists of
radiative modes in the interior and edge modes at the boundary. Such edge modes
are necessary to explain how the region couples to its environment. In this
paper, we characterise the edge modes and radiative modes on a null surface for
the tetradi... | [
{
"created": "Mon, 12 Apr 2021 20:24:35 GMT",
"version": "v1"
}
] | 2021-07-28 | [
[
"Wieland",
"Wolfgang",
""
]
] | In a region with a boundary, the gravitational phase space consists of radiative modes in the interior and edge modes at the boundary. Such edge modes are necessary to explain how the region couples to its environment. In this paper, we characterise the edge modes and radiative modes on a null surface for the tetradic ... |
0802.1221 | Sergei Alexandrov | Sergei Alexandrov | Immirzi parameter and fermions with non-minimal coupling | 4 pages | Class.Quant.Grav.25:145012,2008 | 10.1088/0264-9381/25/14/145012 | PTA/08-003 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We clarify the role played by the Immirzi parameter in classical gravity
coupled to fermions. Considering the general non-minimal coupling, we show
that, although the torsion depends explicitly on the Immirzi parameter, in a
suitable parametrization the effective action obtained by integrating out the
spin-connection... | [
{
"created": "Fri, 8 Feb 2008 21:47:49 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Jun 2008 13:43:22 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Alexandrov",
"Sergei",
""
]
] | We clarify the role played by the Immirzi parameter in classical gravity coupled to fermions. Considering the general non-minimal coupling, we show that, although the torsion depends explicitly on the Immirzi parameter, in a suitable parametrization the effective action obtained by integrating out the spin-connection i... |
1212.4535 | Ernesto F. Eiroa | Ernesto F. Eiroa | Strong deflection gravitational lensing | 15 pages, 2 figures; prepared for the proceedings of I GAC | Gravitation, Relativistic Astrophysics and Cosmology, Proceedings
of the First Argentinian-Brazilian Meeting, Chapter 2, pages 33-52 (Livraria
da Fisica, Sao Paulo, 2013) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work are reviewed several aspects of gravitational lensing produced
by astrophysical bodies that strongly curve the spacetime in their vicinity.
When an object with a photon sphere (e.g. a black hole) is interposed between a
source and an observer, in addition to primary and secondary images due to
small defl... | [
{
"created": "Tue, 18 Dec 2012 23:20:27 GMT",
"version": "v1"
}
] | 2014-09-15 | [
[
"Eiroa",
"Ernesto F.",
""
]
] | In this work are reviewed several aspects of gravitational lensing produced by astrophysical bodies that strongly curve the spacetime in their vicinity. When an object with a photon sphere (e.g. a black hole) is interposed between a source and an observer, in addition to primary and secondary images due to small deflec... |
gr-qc/9802025 | David Salopek | D. S. Salopek | Hamilton-Jacobi Solutions for Strongly-Coupled Gravity and Matter | 26 pages Latex (IOP) file with 2 IOP style files, to be published in
Classical and Quantum Gravity (1998) | Class.Quant.Grav. 15 (1998) 1185-1206 | 10.1088/0264-9381/15/5/009 | null | gr-qc astro-ph | null | A Green's function method is developed for solving strongly-coupled gravity
and matter in the semiclassical limit. In the strong-coupling limit, one
assumes that Newton's constant approaches infinity. As a result, one may
neglect second order spatial gradients, and each spatial point evolves like an
homogeneous unive... | [
{
"created": "Thu, 12 Feb 1998 06:54:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Salopek",
"D. S.",
""
]
] | A Green's function method is developed for solving strongly-coupled gravity and matter in the semiclassical limit. In the strong-coupling limit, one assumes that Newton's constant approaches infinity. As a result, one may neglect second order spatial gradients, and each spatial point evolves like an homogeneous univers... |
1311.6539 | Saurya Das | Saurya Das (University of Lethbridge) | Quantum Raychaudhuri equation | Section on singularity theorems revised. To appear in Phys. Rev. D. 4
pages, revtex | Phys. Rev. D89 (2014) 084068 | 10.1103/PhysRevD.89.084068 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute quantum corrections to the Raychaudhuri equation, by replacing
classical geodesics with quantal (Bohmian) trajectories, and show that they
prevent focusing of geodesics, and the formation of conjugate points. We
discuss implications for the Hawking-Penrose singularity theorems, and for
curvature singularit... | [
{
"created": "Tue, 26 Nov 2013 01:31:43 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Apr 2014 07:54:54 GMT",
"version": "v2"
}
] | 2015-06-18 | [
[
"Das",
"Saurya",
"",
"University of Lethbridge"
]
] | We compute quantum corrections to the Raychaudhuri equation, by replacing classical geodesics with quantal (Bohmian) trajectories, and show that they prevent focusing of geodesics, and the formation of conjugate points. We discuss implications for the Hawking-Penrose singularity theorems, and for curvature singularitie... |
1807.08620 | Amir Ghalee | Amir Ghalee | Condensation of a scalar field non-minimally coupled to gravity in a
cosmological context | 19 pages, 1 figure, minor corrections, references added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new mechanism to condense a scalar field coupled to the
Gauss-Bonnet term. We propose a scenario in which the condensed state will
emerge from the background energy density in the late-Universe. During the
radiation and dust-dominated eras, the energy density of the scalar field,
$\rho_{\varphi}$, decrea... | [
{
"created": "Fri, 20 Jul 2018 03:57:05 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2019 09:53:28 GMT",
"version": "v2"
}
] | 2019-02-27 | [
[
"Ghalee",
"Amir",
""
]
] | We present a new mechanism to condense a scalar field coupled to the Gauss-Bonnet term. We propose a scenario in which the condensed state will emerge from the background energy density in the late-Universe. During the radiation and dust-dominated eras, the energy density of the scalar field, $\rho_{\varphi}$, decrease... |
2306.09843 | Rong-Jia Yang | Rong-Jia Yang, Ming Liu | Hamilton-Jacobi formalism for k-inflation | 10 pages, 2 figures, 1 table | Phys.Dark Univ. 46 (2024) 101560 | 10.1016/j.dark.2024.101560 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We consider a type of k-inflation under the Hamilton-Jacobi approach. We
calculate various observables such as the scalar power spectrum, the
tensor-to-scalar ratio, the scalar spectra index for the case where the Hubble
parameter is a power-law function of k-field. The model's parameters are
constrained with Planck ... | [
{
"created": "Fri, 16 Jun 2023 13:41:21 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jun 2024 14:44:40 GMT",
"version": "v2"
}
] | 2024-06-27 | [
[
"Yang",
"Rong-Jia",
""
],
[
"Liu",
"Ming",
""
]
] | We consider a type of k-inflation under the Hamilton-Jacobi approach. We calculate various observables such as the scalar power spectrum, the tensor-to-scalar ratio, the scalar spectra index for the case where the Hubble parameter is a power-law function of k-field. The model's parameters are constrained with Planck da... |
gr-qc/0009100 | Denis V. Proskurin | Marek Pawlowski, Victor Pervushin, Denis Proskurin | The Field Nature of Time in General Relativity | 12 pages, Latex file, no figures, talk presented at the XXIII
International Colloquium on Group Theoretical Methods in Physics, Dubna,
Russia, 30 July - 5 August 2000 | null | null | null | gr-qc | null | The paper is devoted to the description of the reparametrization - invariant
dynamics of general relativity obtained by resolving constraints and
constructing equivalent unconstrained systems. The constraint-shell action
reveals the "field nature" of the geometric time in general relativity. The
time measured by the ... | [
{
"created": "Thu, 28 Sep 2000 20:01:16 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Oct 2000 11:16:52 GMT",
"version": "v2"
},
{
"created": "Sat, 6 Jan 2001 19:02:58 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Pawlowski",
"Marek",
""
],
[
"Pervushin",
"Victor",
""
],
[
"Proskurin",
"Denis",
""
]
] | The paper is devoted to the description of the reparametrization - invariant dynamics of general relativity obtained by resolving constraints and constructing equivalent unconstrained systems. The constraint-shell action reveals the "field nature" of the geometric time in general relativity. The time measured by the wa... |
1903.00930 | Zucheng Li | Zucheng Li, Yanbin Deng, and Yong-chang Huang | Preinflationary Perturbations in The Thermal Background | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The solution to large-scale power deficit in the cosmic microwave background
fluctuations may be relevant with the physics in the preinflationry period, and
significantly depends on whether the initial conditions are set as Bunch-Davies
vacuum or thermal ground state. We show the primordial cosmological
perturbations... | [
{
"created": "Sun, 3 Mar 2019 16:00:09 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Mar 2019 14:48:28 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Mar 2019 12:21:15 GMT",
"version": "v3"
}
] | 2019-03-15 | [
[
"Li",
"Zucheng",
""
],
[
"Deng",
"Yanbin",
""
],
[
"Huang",
"Yong-chang",
""
]
] | The solution to large-scale power deficit in the cosmic microwave background fluctuations may be relevant with the physics in the preinflationry period, and significantly depends on whether the initial conditions are set as Bunch-Davies vacuum or thermal ground state. We show the primordial cosmological perturbations b... |
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