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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0303010 | Alejandro Jakubi | Juan M. Aguirregabiria, Luis P. Chimento, Alejandro S. Jakubi, and
Ruth Lazkoz | Symmetries leading to inflation | 16 pages, uses RevTeX 4, to appear in Phys. Rev. D | Phys.Rev. D67 (2003) 083518 | 10.1103/PhysRevD.67.083518 | null | gr-qc astro-ph | null | We present here the general transformation that leaves unchanged the form of
the field equations for perfect fluid Friedmann--Robertson--Walker and Bianchi
V cosmologies. The symmetries found can be used as algorithms for generating
new cosmological models from existing ones. A particular case of the general
transfor... | [
{
"created": "Mon, 3 Mar 2003 16:10:49 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Aguirregabiria",
"Juan M.",
""
],
[
"Chimento",
"Luis P.",
""
],
[
"Jakubi",
"Alejandro S.",
""
],
[
"Lazkoz",
"Ruth",
""
]
] | We present here the general transformation that leaves unchanged the form of the field equations for perfect fluid Friedmann--Robertson--Walker and Bianchi V cosmologies. The symmetries found can be used as algorithms for generating new cosmological models from existing ones. A particular case of the general transforma... |
2007.06790 | Simran Arora | Simran Arora, Snehasish Bhattacharjee, P.K. Sahoo | Late-Time Viscous Cosmology in $f(R,T)$ Gravity | New Astronomy accepted version | New Astronomy, 82 (2021) 101452 | 10.1016/j.newast.2020.101452 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The article communicates an alternative route to suffice the late-time
acceleration considering a bulk viscous fluid with viscosity coefficient $\zeta
=\zeta _{0}+ \zeta _{1} H + \zeta _{2} H^{2}$, where $\zeta _{0}, \zeta _{1},
\zeta _{2}$ are constants in the framework of $f(R,T)$ modified gravity. We
presume the $... | [
{
"created": "Tue, 14 Jul 2020 03:22:47 GMT",
"version": "v1"
}
] | 2020-07-20 | [
[
"Arora",
"Simran",
""
],
[
"Bhattacharjee",
"Snehasish",
""
],
[
"Sahoo",
"P. K.",
""
]
] | The article communicates an alternative route to suffice the late-time acceleration considering a bulk viscous fluid with viscosity coefficient $\zeta =\zeta _{0}+ \zeta _{1} H + \zeta _{2} H^{2}$, where $\zeta _{0}, \zeta _{1}, \zeta _{2}$ are constants in the framework of $f(R,T)$ modified gravity. We presume the $f(... |
gr-qc/0602036 | Peter Dunsby | Caroline Zunckel, Gerold Betschart, Peter K S Dunsby, Mattias Marklund | On inhomogeneous magnetic seed fields and gravitational waves within the
MHD limit | 14 pages revtex | Phys.Rev. D73 (2006) 103509 | 10.1103/PhysRevD.73.103509 | null | gr-qc | null | In this paper we apply second-order gauge-invariant perturbation theory to
investigate the possibility that the non-linear coupling between gravitational
waves (GW) and a large scale inhomogeneous magnetic field acts as an
amplification mechanism in an `almost' Friedmann-Lemaitre-Robertson-Walker
(FLRW) Universe. The... | [
{
"created": "Thu, 9 Feb 2006 22:27:19 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Zunckel",
"Caroline",
""
],
[
"Betschart",
"Gerold",
""
],
[
"Dunsby",
"Peter K S",
""
],
[
"Marklund",
"Mattias",
""
]
] | In this paper we apply second-order gauge-invariant perturbation theory to investigate the possibility that the non-linear coupling between gravitational waves (GW) and a large scale inhomogeneous magnetic field acts as an amplification mechanism in an `almost' Friedmann-Lemaitre-Robertson-Walker (FLRW) Universe. The s... |
gr-qc/9910032 | Charles W. Misner | Keith Watt and Charles W. Misner (University of Maryland) | Relativistic Scalar Gravity: A Laboratory for Numerical Relativity | 7 pages including 2 postscript figures; uses revtex.sty | null | null | UMD PP-00-029 | gr-qc | null | We present here a relativistic theory of gravity in which the spacetime
metric is derived from a single scalar field $\Phi$. The field equation,
derived from a simple variational principle, is a non-linear flat-space
four-dimensional wave equation which is particularly suited for numerical
evolution. We demonstrate t... | [
{
"created": "Sun, 10 Oct 1999 02:08:46 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Watt",
"Keith",
"",
"University of Maryland"
],
[
"Misner",
"Charles W.",
"",
"University of Maryland"
]
] | We present here a relativistic theory of gravity in which the spacetime metric is derived from a single scalar field $\Phi$. The field equation, derived from a simple variational principle, is a non-linear flat-space four-dimensional wave equation which is particularly suited for numerical evolution. We demonstrate tha... |
2005.08507 | Jean-Marc Hur\'e | J.-M. Hur\'e, B. Basillais, V. Karas, A. Trova and O. Semer\'ak | The exterior gravitational potential of toroids | 15 pages, 12 figures, accepted for publication in MNRAS | null | 10.1093/mnras/staa980 | null | gr-qc astro-ph.IM physics.plasm-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a bivariate Taylor expansion of the axisymmetric Green function in
order to determine the exterior potential of a static thin toroidal shell
having a circular section, as given by the Laplace equation. This expansion,
performed at the centre of the section, consists in an infinite series in the
powers of t... | [
{
"created": "Mon, 18 May 2020 07:49:07 GMT",
"version": "v1"
}
] | 2020-05-27 | [
[
"Huré",
"J. -M.",
""
],
[
"Basillais",
"B.",
""
],
[
"Karas",
"V.",
""
],
[
"Trova",
"A.",
""
],
[
"Semerák",
"O.",
""
]
] | We perform a bivariate Taylor expansion of the axisymmetric Green function in order to determine the exterior potential of a static thin toroidal shell having a circular section, as given by the Laplace equation. This expansion, performed at the centre of the section, consists in an infinite series in the powers of the... |
2105.09676 | Shuichi Yokoyama | Shuichi Yokoyama | An analytic model for gravitational collapse of spherical matter under
mixed pressure | 17 pages, 5 figures, v2: The continuity condition imposed at
interface, the equation of state imposed near interface, more explanations
and discussions, other minor modifications, v3: 21 pages, 9 figures,
discussion of energy conditions, figures improved, published version | null | null | YITP-21-35 | gr-qc hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We investigate spherically symmetric gravitational collapse of thick matter
shell without radiation in the Einstein gravity with cosmological constant. The
orbit of the infalling thick matter is determined by imposing an equation of
state for the matter near interface, where pressure constituted of the
transverse com... | [
{
"created": "Thu, 20 May 2021 11:30:23 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Nov 2021 11:15:54 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Jan 2023 13:51:51 GMT",
"version": "v3"
}
] | 2023-01-10 | [
[
"Yokoyama",
"Shuichi",
""
]
] | We investigate spherically symmetric gravitational collapse of thick matter shell without radiation in the Einstein gravity with cosmological constant. The orbit of the infalling thick matter is determined by imposing an equation of state for the matter near interface, where pressure constituted of the transverse compo... |
gr-qc/9809045 | Fredrik Andersson | F. Andersson and S. B. Edgar | Spinors, Spin Coefficients and Lanczos Potentials | 10 pages, LaTeX-file | null | null | null | gr-qc | null | It has been demonstrated, in a number of special situations, that the spin
coefficients of a canonical spinor dyad can be used to define a Lanczos
potential of the Weyl curvature spinor. In this paper we explore some of these
potentials and show that they can be defined directly from the spinor dyad in a
very simple ... | [
{
"created": "Tue, 15 Sep 1998 14:18:34 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Andersson",
"F.",
""
],
[
"Edgar",
"S. B.",
""
]
] | It has been demonstrated, in a number of special situations, that the spin coefficients of a canonical spinor dyad can be used to define a Lanczos potential of the Weyl curvature spinor. In this paper we explore some of these potentials and show that they can be defined directly from the spinor dyad in a very simple wa... |
2401.04170 | Leonhard Kehrberger | Leonhard Kehrberger | The Case Against Smooth Null Infinity IV: Linearised Gravity Around
Schwarzschild -- An Overview | 28 pages + references, 6 Figures. Comments and questions welcome! v2:
Fixed an incorrect cross-reference | Philosophical Transactions of the Royal Society A, 2024 | 10.1098/rsta.2023.0039 | null | gr-qc math-ph math.AP math.MP | http://creativecommons.org/licenses/by-sa/4.0/ | This paper is the fourth in a series dedicated to the mathematically rigorous
asymptotic analysis of gravitational radiation under astrophysically realistic
setups. It provides an overview of the physical ideas involved in setting up
the mathematical problem, the mathematical challenges that need to be overcome
once ... | [
{
"created": "Mon, 8 Jan 2024 19:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Apr 2024 16:13:20 GMT",
"version": "v2"
}
] | 2024-04-30 | [
[
"Kehrberger",
"Leonhard",
""
]
] | This paper is the fourth in a series dedicated to the mathematically rigorous asymptotic analysis of gravitational radiation under astrophysically realistic setups. It provides an overview of the physical ideas involved in setting up the mathematical problem, the mathematical challenges that need to be overcome once th... |
1111.3438 | Arkady A. Popov | Arkady A. Popov | Renormalization for self-potential of a scalar charge in static
space-times | 7 pages | Physical Review D 84, 064009 (2011) | 10.1103/PhysRevD.84.064009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A method is presented which allows for the renormalization of the
self-potential for a scalar point charge at rest in static curved space-time.
The method is suitable for the scalar field with arbitrary mass $m$ and
coupling to the scalar curvature. The asymptotic behavior of self-potential is
obtained in the limit i... | [
{
"created": "Tue, 15 Nov 2011 06:52:19 GMT",
"version": "v1"
}
] | 2011-11-16 | [
[
"Popov",
"Arkady A.",
""
]
] | A method is presented which allows for the renormalization of the self-potential for a scalar point charge at rest in static curved space-time. The method is suitable for the scalar field with arbitrary mass $m$ and coupling to the scalar curvature. The asymptotic behavior of self-potential is obtained in the limit in ... |
gr-qc/0505002 | Ghanashyam Date | Ghanashyam Date | Absence of the Kasner singularity in the effective dynamics from loop
quantum cosmology | 4 pages, revtex4, no figures | Phys.Rev. D71 (2005) 127502 | 10.1103/PhysRevD.71.127502 | IMSc/2005/4/11 | gr-qc astro-ph hep-th | null | In classical general relativity, the generic approach to the initial
singularity is usually understood in terms of the BKL scenario. In this
scenario, along with the Bianchi IX model, the exact, singular, Kasner solution
of vacuum Bianchi I model also plays a pivotal role. Using an effective
classical Hamiltonian obt... | [
{
"created": "Sat, 30 Apr 2005 12:37:04 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Date",
"Ghanashyam",
""
]
] | In classical general relativity, the generic approach to the initial singularity is usually understood in terms of the BKL scenario. In this scenario, along with the Bianchi IX model, the exact, singular, Kasner solution of vacuum Bianchi I model also plays a pivotal role. Using an effective classical Hamiltonian obtai... |
2107.14520 | Seramika Ariwahjoedi | Seramika Ariwahjoedi, Agus Suroso, F. P. Zen | (3+1)-Formulation for Gravity with Torsion and Non-Metricity II: The
Hypermomentum Equation | 28 pages | Class. Quantum Grav. 38 225006 2021 | 10.1088/1361-6382/ac2c1c | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we consider a special case of Metric-Affine f(R)-gravity for
f(R) = R, i.e. the Metric-Affine General Relativity (MAGR). As a companion to
the first article in the series, we perform the (3+1) decomposition to the
hypermomentum equation, obtained from the minimization of the MAGR action S [g,
{\omega... | [
{
"created": "Fri, 30 Jul 2021 10:04:29 GMT",
"version": "v1"
}
] | 2021-10-29 | [
[
"Ariwahjoedi",
"Seramika",
""
],
[
"Suroso",
"Agus",
""
],
[
"Zen",
"F. P.",
""
]
] | In this article, we consider a special case of Metric-Affine f(R)-gravity for f(R) = R, i.e. the Metric-Affine General Relativity (MAGR). As a companion to the first article in the series, we perform the (3+1) decomposition to the hypermomentum equation, obtained from the minimization of the MAGR action S [g, {\omega}]... |
gr-qc/9601019 | Doug Eardley | Douglas M. Eardley and Eric W. Hirschmann | Comment on "Instabilities in Close Neutron Star Binaries" | 3 pages LaTeX (revtex, epsf) and 1 figure; figure also available at
ftp://ftp.itp.ucsb.edu/figures/nsf-itp-95-165.eps | null | null | NSF-ITP-95-165 | gr-qc | null | In a recent Physical Review Letter, Wilson and Mathews presented some
interesting numerical calculations of a system of two equally massive neutron
stars in strong-field gravity. In particular they estimated the innermost
stable circular orbit in their system. Here we point out a possibly important
consequence of the... | [
{
"created": "Thu, 11 Jan 1996 17:27:18 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Eardley",
"Douglas M.",
""
],
[
"Hirschmann",
"Eric W.",
""
]
] | In a recent Physical Review Letter, Wilson and Mathews presented some interesting numerical calculations of a system of two equally massive neutron stars in strong-field gravity. In particular they estimated the innermost stable circular orbit in their system. Here we point out a possibly important consequence of their... |
2111.12329 | Alexander Simpson | Alex Simpson and Matt Visser | The eye of the storm: A regular Kerr black hole | V1: 27 pages, 71 references. V2: Now 28 pages, 83 references; some
discourse added with relevant citations, small physics changes with inclusion
of Maxwell separability | null | 10.1088/1475-7516/2022/03/011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a highly tractable non-singular modification of the Kerr geometry,
dubbed the "eye of the storm" -- a rotating regular black hole with an
asymptotically Minkowski core. This is achieved by "exponentially suppressing"
the mass parameter in the Kerr spacetime: $m\to m \; e^{-\ell/r}$. The single
parameter $\... | [
{
"created": "Wed, 24 Nov 2021 08:23:10 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Dec 2021 22:10:21 GMT",
"version": "v2"
}
] | 2022-03-14 | [
[
"Simpson",
"Alex",
""
],
[
"Visser",
"Matt",
""
]
] | We present a highly tractable non-singular modification of the Kerr geometry, dubbed the "eye of the storm" -- a rotating regular black hole with an asymptotically Minkowski core. This is achieved by "exponentially suppressing" the mass parameter in the Kerr spacetime: $m\to m \; e^{-\ell/r}$. The single parameter $\el... |
2003.10169 | Hari K | Hari K and Dawood Kothawala | Normal coordinates based on curved tangent space | 13 pages, 4 figures, comments added and typos fixed, matches version
accepted in Phys. Rev. D | Phys. Rev. D 101, 124066 (2020) | 10.1103/PhysRevD.101.124066 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Riemann normal coordinates (RNC) at a regular event $p_0$ of a spacetime
manifold $\mathcal{M}$ are constructed by imposing: (i)
$g_{\textsf{ab}}|_{p_0}=\eta_{ab}$, and (ii)
$\Gamma^\textsf{a}_{\phantom{\textsf a}\textsf{bc}}|_{p_0}=0$. There is,
however, a third, $independent$, assumption in the definition of RNC wh... | [
{
"created": "Mon, 23 Mar 2020 10:36:12 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Jun 2020 06:40:02 GMT",
"version": "v2"
}
] | 2020-06-30 | [
[
"K",
"Hari",
""
],
[
"Kothawala",
"Dawood",
""
]
] | Riemann normal coordinates (RNC) at a regular event $p_0$ of a spacetime manifold $\mathcal{M}$ are constructed by imposing: (i) $g_{\textsf{ab}}|_{p_0}=\eta_{ab}$, and (ii) $\Gamma^\textsf{a}_{\phantom{\textsf a}\textsf{bc}}|_{p_0}=0$. There is, however, a third, $independent$, assumption in the definition of RNC whic... |
1906.09796 | Avijit Chowdhury | Avijit Chowdhury and Narayan Banerjee | Superradiant stability of Mutated Reissner-Nordstr\"{o}m black holes | 8 pages; 1 figure; Published Version in GERG | Gen. Relativ. Gravit. 51, 99 (2019) | 10.1007/s10714-019-2580-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A scalar hair is used to generate a mutated black hole, which mimics an
Einstein-Rosen bridge or a wormhole. The superradiant stability of the
spacetime is studied under perturbation by an electrically charged massive
scalar field. The system appears to be stable against superradiance
irrespective of the mass of the ... | [
{
"created": "Mon, 24 Jun 2019 09:09:33 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Oct 2019 14:04:44 GMT",
"version": "v2"
}
] | 2019-11-01 | [
[
"Chowdhury",
"Avijit",
""
],
[
"Banerjee",
"Narayan",
""
]
] | A scalar hair is used to generate a mutated black hole, which mimics an Einstein-Rosen bridge or a wormhole. The superradiant stability of the spacetime is studied under perturbation by an electrically charged massive scalar field. The system appears to be stable against superradiance irrespective of the mass of the te... |
1901.01790 | Nick Kwidzinski | Nick Kwidzinski, W{\l}odzimierz Piechocki | Curvature invariants for the Bianchi IX spacetime filled with tilted
dust | 16 pages, 6 figures, Revision: minor editing and references added,
accepted for publication in Euro. Phys. J. C | Eur. Phys. J. C (2019) 79:199 | 10.1140/epjc/s10052-019-6701-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an analysis of the Kretschmann and Weyl squared scalars for the
general Bianchi IX model filled with tilted dust. Particular attention is given
to the asymptotic regime close to the singularity for which we provide
heuristic considerations supported by numerical simulations. The present paper
is an extensi... | [
{
"created": "Mon, 7 Jan 2019 13:15:58 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Feb 2019 13:22:18 GMT",
"version": "v2"
}
] | 2019-08-23 | [
[
"Kwidzinski",
"Nick",
""
],
[
"Piechocki",
"Włodzimierz",
""
]
] | We present an analysis of the Kretschmann and Weyl squared scalars for the general Bianchi IX model filled with tilted dust. Particular attention is given to the asymptotic regime close to the singularity for which we provide heuristic considerations supported by numerical simulations. The present paper is an extension... |
0807.3281 | Simone Zonetti | Francesco Cianfrani (1), Giovanni Montani (1, 2 and 3), Simone Zonetti
(4) ((1) Dipartimento di Fisica, Universita degli Studi di Roma "La Sapienza"
(2) ENEA C.R. Frascati (Dipartimento F.P.N.), (3) ICRANet C.C. Pescara, (4)
Center for Particle Physics and Phenomenology (CP3), Universit\`e Catholique
de Louvain... | Definition of a time variable with Entropy of a perfect fluid in
Canonical Quantum Gravity | 13 pages, no figures. To be published in Classical and Quantum
Gravity. v2: major changes | Class.Quant.Grav.26:125002,2009 | 10.1088/0264-9381/26/12/125002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Brown-Kuchar mechanism is applied in the case of General Relativity
coupled with the Schutz model for a perfect fluid. Using the canonical
formalism and manipulating the set of modified constraints one is able to
recover the definition of a time evolution operator, i.e. a physical
Hamiltonian, expressed as a func... | [
{
"created": "Mon, 21 Jul 2008 14:49:49 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Apr 2009 17:04:23 GMT",
"version": "v2"
}
] | 2009-07-30 | [
[
"Cianfrani",
"Francesco",
"",
"1, 2 and 3"
],
[
"Montani",
"Giovanni",
"",
"1, 2 and 3"
],
[
"Zonetti",
"Simone",
""
]
] | The Brown-Kuchar mechanism is applied in the case of General Relativity coupled with the Schutz model for a perfect fluid. Using the canonical formalism and manipulating the set of modified constraints one is able to recover the definition of a time evolution operator, i.e. a physical Hamiltonian, expressed as a functi... |
1612.07756 | Yen Chin Ong | Yen Chin Ong, Dong-han Yeom | Instanton Tunneling for De Sitter Space with Real Projective Spatial
Sections | 10 pages, 11 figures, slightly elaborated version accepted by JCAP | JCAP 04 (2017) 040 | 10.1088/1475-7516/2017/04/040 | NORDITA-2016-138 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The physics of tunneling from one spacetime into another is often understood
in terms of instantons. For some instantons, it was recently shown in the
literature that there are two complementary "interpretations" for their
analytic continuations. Dubbed "something-to-something" and
"nothing-to-something" interpretati... | [
{
"created": "Thu, 22 Dec 2016 19:17:13 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2017 15:34:14 GMT",
"version": "v2"
}
] | 2017-04-27 | [
[
"Ong",
"Yen Chin",
""
],
[
"Yeom",
"Dong-han",
""
]
] | The physics of tunneling from one spacetime into another is often understood in terms of instantons. For some instantons, it was recently shown in the literature that there are two complementary "interpretations" for their analytic continuations. Dubbed "something-to-something" and "nothing-to-something" interpretation... |
1706.04444 | Sergey Gubanov | Sergey Gubanov | The spherically symmetric gravitational field | 18 pages, no figures | null | null | null | gr-qc astro-ph.CO astro-ph.HE hep-th physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The general solution of the system of General Relativity equations has been
found for isotropic Universe with the flat spatial distribution and
synchronized time taking into account a perfect dust and the cosmological
constant. Schwarzschild, Friedmann and Einstein-de Sitter solutions (as well as
all of their fusion ... | [
{
"created": "Wed, 14 Jun 2017 12:33:37 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Jun 2017 20:11:16 GMT",
"version": "v2"
}
] | 2017-06-20 | [
[
"Gubanov",
"Sergey",
""
]
] | The general solution of the system of General Relativity equations has been found for isotropic Universe with the flat spatial distribution and synchronized time taking into account a perfect dust and the cosmological constant. Schwarzschild, Friedmann and Einstein-de Sitter solutions (as well as all of their fusion wi... |
gr-qc/9703063 | Sung S.-T. | S.-T. Sung | Notes on the Generalised Second Law of Thermodynamics | 10 pages, Latex | null | null | null | gr-qc | null | Several comments are given to previous proofs of the generalised second law
of thermodynamics: black hole entropy plus ordinary matter entropy never
decreases for a thermally closed system. Arguments in favour of its truism are
given in the spirit of conventional thermodynamics.
| [
{
"created": "Sat, 22 Mar 1997 22:56:25 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sung",
"S. -T.",
""
]
] | Several comments are given to previous proofs of the generalised second law of thermodynamics: black hole entropy plus ordinary matter entropy never decreases for a thermally closed system. Arguments in favour of its truism are given in the spirit of conventional thermodynamics. |
gr-qc/0301113 | Alejandro Perez | Alejandro Perez | Spin Foam Models for Quantum Gravity | Topical review, to appear in CQG. Typos corrected and new references
added | Class.Quant.Grav. 20 (2003) R43 | 10.1088/0264-9381/20/6/202 | null | gr-qc hep-th | null | In this article we review the present status of the spin foam formulation of
non-perturbative (background independent) quantum gravity. The article is
divided in two parts. In the first part we present a general introduction to
the main ideas emphasizing their motivations from various perspectives.
Riemannian 3-dimen... | [
{
"created": "Mon, 27 Jan 2003 22:59:37 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Feb 2003 23:25:44 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Perez",
"Alejandro",
""
]
] | In this article we review the present status of the spin foam formulation of non-perturbative (background independent) quantum gravity. The article is divided in two parts. In the first part we present a general introduction to the main ideas emphasizing their motivations from various perspectives. Riemannian 3-dimensi... |
1502.07518 | Francisco Jose Herranz | Angel Ballesteros, Francisco J. Herranz and Pedro Naranjo | Towards (3+1) gravity through Drinfel'd doubles with cosmological
constant | 12 pages. References and comments added. One misprint corrected | Phys. Lett. B 746 (2015) 37-43 | 10.1016/j.physletb.2015.04.041 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the generalisation to (3+1) dimensions of a quantum deformation of
the (2+1) (Anti)-de Sitter and Poincar\'e Lie algebras that is compatible with
the conditions imposed by the Chern-Simons formulation of (2+1) gravity. Since
such compatibility is automatically fulfilled by deformations coming from
Drinfel'... | [
{
"created": "Thu, 26 Feb 2015 12:06:02 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Apr 2015 10:24:42 GMT",
"version": "v2"
},
{
"created": "Mon, 27 Apr 2015 19:49:50 GMT",
"version": "v3"
}
] | 2015-05-18 | [
[
"Ballesteros",
"Angel",
""
],
[
"Herranz",
"Francisco J.",
""
],
[
"Naranjo",
"Pedro",
""
]
] | We present the generalisation to (3+1) dimensions of a quantum deformation of the (2+1) (Anti)-de Sitter and Poincar\'e Lie algebras that is compatible with the conditions imposed by the Chern-Simons formulation of (2+1) gravity. Since such compatibility is automatically fulfilled by deformations coming from Drinfel'd ... |
1908.07543 | Klaus Liegener Dr | Klaus Liegener, Parampreet Singh | Some physical implications of regularization ambiguities in SU(2)
gauge-invariant loop quantum cosmology | 31 pages, 10 figures. References and a figure added. To appear in PRD | Phys. Rev. D 100, 124049 (2019) | 10.1103/PhysRevD.100.124049 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The way physics of loop quantum gravity is affected by the underlying
quantization ambiguities is an open question. We address this issue in the
context of loop quantum cosmology using gauge-covariant fluxes. Consequences
are explored for two choices of regularization parameters: $\mu_0$ and $\bar
\mu$ in presence of... | [
{
"created": "Tue, 20 Aug 2019 18:01:16 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Nov 2019 22:22:23 GMT",
"version": "v2"
}
] | 2019-12-25 | [
[
"Liegener",
"Klaus",
""
],
[
"Singh",
"Parampreet",
""
]
] | The way physics of loop quantum gravity is affected by the underlying quantization ambiguities is an open question. We address this issue in the context of loop quantum cosmology using gauge-covariant fluxes. Consequences are explored for two choices of regularization parameters: $\mu_0$ and $\bar \mu$ in presence of a... |
2103.13972 | Philip D. Mannheim | Philip D. Mannheim and John W. Moffat | External Field Effect in Gravity | 9 pages, 4 figures. Essay written for the Gravity Research Foundation
2021 Awards for Essays on Gravitation | null | 10.1142/S0218271821420098 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In both Newtonian gravity and Einstein gravity there is no force on a test
particle located inside a spherical cavity cut out of a static, spherically
symmetric mass distribution. Inside the cavity exterior matter is decoupled and
there is no external field effect that could act on the test particle. However,
for pot... | [
{
"created": "Thu, 25 Mar 2021 17:00:24 GMT",
"version": "v1"
}
] | 2022-01-26 | [
[
"Mannheim",
"Philip D.",
""
],
[
"Moffat",
"John W.",
""
]
] | In both Newtonian gravity and Einstein gravity there is no force on a test particle located inside a spherical cavity cut out of a static, spherically symmetric mass distribution. Inside the cavity exterior matter is decoupled and there is no external field effect that could act on the test particle. However, for poten... |
1903.06005 | Alexander Oliveros | A. Oliveros and Marcos A. Jaraba | Inflation driven by massive vector fields with derivative
self-interactions | 13 pages, 3 figures | Int. J. Mod. Phys. D 28 (2019) 1950064 | 10.1142/S0218271819500640 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by the Generalized Proca Theory, we study a vector-tensor model of
inflation with massive vector fields and derivative self-interactions. The
action under consideration contains a usual Maxwell-like kinetic term, a
general potential term and a term with non-minimal derivative coupling between
the vector fiel... | [
{
"created": "Mon, 11 Mar 2019 20:52:59 GMT",
"version": "v1"
}
] | 2019-03-15 | [
[
"Oliveros",
"A.",
""
],
[
"Jaraba",
"Marcos A.",
""
]
] | Inspired by the Generalized Proca Theory, we study a vector-tensor model of inflation with massive vector fields and derivative self-interactions. The action under consideration contains a usual Maxwell-like kinetic term, a general potential term and a term with non-minimal derivative coupling between the vector field ... |
gr-qc/0309060 | Albert V. Minkevich | A.V. Minkevich | Comments on astro-ph/0305039 and gr-qc/0309036 | Some changes made | null | null | null | gr-qc | null | The main results of papers gr-qc/0307026 and gr-qc/0312068 are formulated.
These results are opposite to conclusions of paper astro-ph/0305039 and
comments gr-qc/0309036.
| [
{
"created": "Thu, 11 Sep 2003 18:04:09 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Sep 2003 06:46:00 GMT",
"version": "v2"
},
{
"created": "Sun, 14 Sep 2003 17:33:21 GMT",
"version": "v3"
},
{
"created": "Tue, 2 Mar 2004 12:11:27 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Minkevich",
"A. V.",
""
]
] | The main results of papers gr-qc/0307026 and gr-qc/0312068 are formulated. These results are opposite to conclusions of paper astro-ph/0305039 and comments gr-qc/0309036. |
gr-qc/0701065 | Fredy Dubeibe | F. L. Dubeibe, Leonardo A. Pachon and Jose D. Sanabria-Gomez | Chaotic dynamics around astrophysical objects with nonisotropic stresses | 7 pages, 5 figures | Phys.Rev. D75:023008,2007 | 10.1103/PhysRevD.75.023008 | null | gr-qc | null | The existence of chaotic behavior for the geodesics of the test particles
orbiting compact objects is a subject of much current research. Some years ago,
Gu\'eron and Letelier [Phys. Rev. E \textbf{66}, 046611 (2002)] reported the
existence of chaotic behavior for the geodesics of the test particles orbiting
compact ... | [
{
"created": "Thu, 11 Jan 2007 23:17:56 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Feb 2007 22:59:35 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Dubeibe",
"F. L.",
""
],
[
"Pachon",
"Leonardo A.",
""
],
[
"Sanabria-Gomez",
"Jose D.",
""
]
] | The existence of chaotic behavior for the geodesics of the test particles orbiting compact objects is a subject of much current research. Some years ago, Gu\'eron and Letelier [Phys. Rev. E \textbf{66}, 046611 (2002)] reported the existence of chaotic behavior for the geodesics of the test particles orbiting compact ob... |
2210.12898 | Martin Reiris | Javier Peraza and Mart\'in Reiris and Omar E. Ortiz | Periodic analogues of the Kerr solutions: a numerical study | 25 pages | null | 10.1088/1361-6382/ace7a7 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In recent years black hole configurations with non standard topology or with
non-standard asymptotic have gained considerable attention. In this article we
carry out numerical investigations aimed to find periodic coaxial
configurations of co-rotating 3+1 vacuum black holes, for which existence and
uniqueness has not... | [
{
"created": "Mon, 24 Oct 2022 00:57:05 GMT",
"version": "v1"
}
] | 2023-08-16 | [
[
"Peraza",
"Javier",
""
],
[
"Reiris",
"Martín",
""
],
[
"Ortiz",
"Omar E.",
""
]
] | In recent years black hole configurations with non standard topology or with non-standard asymptotic have gained considerable attention. In this article we carry out numerical investigations aimed to find periodic coaxial configurations of co-rotating 3+1 vacuum black holes, for which existence and uniqueness has not y... |
1101.0366 | Yurii Ignatyev | Yu.G.Ignatyev, D.Yu.Ignatyev | A Kinetics Of The Non-Equilibrium Universe. II. A Kinetics Of The Local
Thermodynamical Equilibrium's Recovery | 29 pages, 11 figures, 13 references | Gravitation & Cosmology, Vol. 13, No 2, 2007, p. 101-113 | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been researched the kinetics of the thermal equilibrium's
establishment in an early Universe under the assumption of the recovery of
interaction scaling of elementary particles in range of superhigh energies. The
case of the thermal equilibrium's weak initial violation and basic cosmological
consequences of th... | [
{
"created": "Sat, 1 Jan 2011 19:51:13 GMT",
"version": "v1"
}
] | 2011-01-04 | [
[
"Ignatyev",
"Yu. G.",
""
],
[
"Ignatyev",
"D. Yu.",
""
]
] | It has been researched the kinetics of the thermal equilibrium's establishment in an early Universe under the assumption of the recovery of interaction scaling of elementary particles in range of superhigh energies. The case of the thermal equilibrium's weak initial violation and basic cosmological consequences of the ... |
gr-qc/9810078 | Joy Christian | Joy Christian (Oxford University) | Why the Quantum Must Yield to Gravity | 33 pages (TeX, uses mtexsis) plus 3 figures (epsf). To appear in
``Physics Meets Philosophy at the Planck Scale'' (Cambridge University
Press). Two footnotes added | null | 10.1017/CBO9780511612909.015 | null | gr-qc quant-ph | null | After providing an extensive overview of the conceptual elements -- such as
Einstein's `hole argument' -- that underpin Penrose's proposal for
gravitationally induced quantum state reduction, the proposal is constructively
criticised. Penrose has suggested a mechanism for objective reduction of
quantum states with po... | [
{
"created": "Mon, 26 Oct 1998 21:14:55 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Nov 1998 14:51:20 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Mar 1999 16:56:57 GMT",
"version": "v3"
}
] | 2016-07-05 | [
[
"Christian",
"Joy",
"",
"Oxford University"
]
] | After providing an extensive overview of the conceptual elements -- such as Einstein's `hole argument' -- that underpin Penrose's proposal for gravitationally induced quantum state reduction, the proposal is constructively criticised. Penrose has suggested a mechanism for objective reduction of quantum states with post... |
gr-qc/0210069 | Alberto Saa | L. Raul Abramo, Leon Brenig, Edgard Gunzig, and Alberto Saa | On the singularities of gravity in the presence of non-minimally coupled
scalar fields | To appear in PRD | Phys.Rev. D67 (2003) 027301 | 10.1103/PhysRevD.67.027301 | null | gr-qc | null | We investigate the robustness of some recent results obtained for homogeneous
and isotropic cosmological models with conformally coupled scalar fields. For
this purpose, we investigate anisotropic homogeneous solutions of the models
described by the action $$ S=\int d^4x \sqrt{-g}\left\{F(\phi)R -
\partial_a\phi\part... | [
{
"created": "Sun, 20 Oct 2002 18:51:49 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Abramo",
"L. Raul",
""
],
[
"Brenig",
"Leon",
""
],
[
"Gunzig",
"Edgard",
""
],
[
"Saa",
"Alberto",
""
]
] | We investigate the robustness of some recent results obtained for homogeneous and isotropic cosmological models with conformally coupled scalar fields. For this purpose, we investigate anisotropic homogeneous solutions of the models described by the action $$ S=\int d^4x \sqrt{-g}\left\{F(\phi)R - \partial_a\phi\partia... |
1408.4949 | Andrea Geralico | Donato Bini, Fernando de Felice, Andrea Geralico | Accelerated orbits in black hole fields: the static case | 21 pages, 6 figures; published version | Class. Quantum Grav. 28, 225012 (2011) | 10.1088/0264-9381/28/22/225012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study non-geodesic orbits of test particles endowed with a structure,
assuming the Schwarzschild spacetime as background. We develop a formalism
which allows one to recognize the geometrical characterization of those orbits
in terms of their Frenet-Serret parameters and apply it to explicit cases as
those of spati... | [
{
"created": "Thu, 21 Aug 2014 10:53:50 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"de Felice",
"Fernando",
""
],
[
"Geralico",
"Andrea",
""
]
] | We study non-geodesic orbits of test particles endowed with a structure, assuming the Schwarzschild spacetime as background. We develop a formalism which allows one to recognize the geometrical characterization of those orbits in terms of their Frenet-Serret parameters and apply it to explicit cases as those of spatial... |
1805.06036 | Natacha Leite | Natacha Leite and Petar Pavlovi\'c | Magnetogenesis in Cyclical Universe | 21 pages, 4 figures | null | 10.1088/1361-6382/aae2d6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a simple solution to the magnetogenesis problem based on cyclic
cosmology. It is demonstrated that magnetic fields, of sufficient strengths to
account for the present observational bounds, can be created in the contracting
phase preceding the beginning of the current cosmological cycle. The basic
assumptio... | [
{
"created": "Tue, 15 May 2018 21:18:17 GMT",
"version": "v1"
}
] | 2018-10-24 | [
[
"Leite",
"Natacha",
""
],
[
"Pavlović",
"Petar",
""
]
] | We propose a simple solution to the magnetogenesis problem based on cyclic cosmology. It is demonstrated that magnetic fields, of sufficient strengths to account for the present observational bounds, can be created in the contracting phase preceding the beginning of the current cosmological cycle. The basic assumption ... |
1511.07955 | Nilanjana Mahata | Nilanjana Mahata and Subenoy Chakraborty | A Dynamical System Analysis of Holographic Dark Energy Models with
Different IR Cutoff | 13 pages, 9 figures | Modern Physics Letters A, Vol. 30, No. 27(2015) 1550134 | 10.1142/S0217732315501345 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper deals with a dynamical system analysis of the cosmological
evolution of an holographic dark energy (HDE) model interacting with dark
matter (DM) which is chosen in the form of dust. The infrared cut-off of the
holographic model is chosen as future event horizon or Ricci length scale. The
interaction term be... | [
{
"created": "Wed, 25 Nov 2015 05:38:00 GMT",
"version": "v1"
}
] | 2015-11-26 | [
[
"Mahata",
"Nilanjana",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The paper deals with a dynamical system analysis of the cosmological evolution of an holographic dark energy (HDE) model interacting with dark matter (DM) which is chosen in the form of dust. The infrared cut-off of the holographic model is chosen as future event horizon or Ricci length scale. The interaction term betw... |
gr-qc/9911061 | Masoud Alimohammadi | M. Alimohammadi, A. shariati | Quantum reflection of massless neutrinos from a torsion-induced
potential | 8 pages, LaTex | Int.J.Mod.Phys. A15 (2000) 4099-4106 | 10.1142/S0217751X00001130 | null | gr-qc hep-th | null | In the context of the Einstein-Cartan-Dirac model, where the torsion of the
space-time couples to the axial currents of the fermions, we study the effects
of this quantum-gravitational interaction on a massless neutrino beam crossing
through a medium with high number density of fermions at rest. We calculate the
refl... | [
{
"created": "Wed, 17 Nov 1999 15:01:50 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Alimohammadi",
"M.",
""
],
[
"shariati",
"A.",
""
]
] | In the context of the Einstein-Cartan-Dirac model, where the torsion of the space-time couples to the axial currents of the fermions, we study the effects of this quantum-gravitational interaction on a massless neutrino beam crossing through a medium with high number density of fermions at rest. We calculate the reflec... |
2010.08711 | Jasel Berra-Montiel | Jasel Berra-Montiel, Alberto Molgado and Eduardo Torres-Cordero | Star product approach for Loop Quantum Cosmology | 21 pages, no figures | null | null | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Guided by recent developments towards the implementation of the deformation
quantization program within the Loop Quantum Cosmology (LQC) formalism, in this
paper we address the introduction of both the integral and differential
representation of the star product for LQC. To this end, we consider the Weyl
quantization... | [
{
"created": "Sat, 17 Oct 2020 04:02:52 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Oct 2022 16:11:47 GMT",
"version": "v2"
}
] | 2022-10-04 | [
[
"Berra-Montiel",
"Jasel",
""
],
[
"Molgado",
"Alberto",
""
],
[
"Torres-Cordero",
"Eduardo",
""
]
] | Guided by recent developments towards the implementation of the deformation quantization program within the Loop Quantum Cosmology (LQC) formalism, in this paper we address the introduction of both the integral and differential representation of the star product for LQC. To this end, we consider the Weyl quantization m... |
0909.2747 | Guido Cognola | G. Cognola, E. Elizalde, S. Nojiri, S.D. Odintsov | Vacuum energy fluctuations, the induced cosmological constant and
cosmological reconstruction in non-minimal modified gravity models | Latex file, 14 pages, no figures | Open Astron.J.3:20-29,2010 | 10.2174/1874381101003020020 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The one-loop effective action for non-minimal scalar modified gravity on de
Sitter background with a constant scalar field is found. The corresponding
induced cosmological constant is evaluated. It is shown that quantum effects in
non-minimal modified gravity may induce an early-time de Sitter universe even
in the si... | [
{
"created": "Tue, 15 Sep 2009 08:47:46 GMT",
"version": "v1"
}
] | 2011-04-07 | [
[
"Cognola",
"G.",
""
],
[
"Elizalde",
"E.",
""
],
[
"Nojiri",
"S.",
""
],
[
"Odintsov",
"S. D.",
""
]
] | The one-loop effective action for non-minimal scalar modified gravity on de Sitter background with a constant scalar field is found. The corresponding induced cosmological constant is evaluated. It is shown that quantum effects in non-minimal modified gravity may induce an early-time de Sitter universe even in the situ... |
gr-qc/9805040 | Esposito Giampiero | Giampiero Esposito and Alexander Yu. Kamenshchik | Two-boundary problems in Euclidean quantum gravity | 19 pages, plain Tex | Nuovo Cim. B114 (1999) 57-70 | null | DSF preprint 98/13 | gr-qc | null | Recent work in the literature has studied a new set of local boundary
conditions for the quantized gravitational field, where the spatial components
of metric perturbations, and ghost modes, are subject to Robin boundary
conditions, whereas normal components of metric perturbations obey Dirichlet
boundary conditions.... | [
{
"created": "Tue, 12 May 1998 06:30:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Esposito",
"Giampiero",
""
],
[
"Kamenshchik",
"Alexander Yu.",
""
]
] | Recent work in the literature has studied a new set of local boundary conditions for the quantized gravitational field, where the spatial components of metric perturbations, and ghost modes, are subject to Robin boundary conditions, whereas normal components of metric perturbations obey Dirichlet boundary conditions. S... |
gr-qc/0703057 | Eyo Ita III | Eyo Eyo Ita III | Instanton representation of Plebanski gravity. Gravitational instantons
from the classical formalism | 33 pages. Background information for revised journal article | The Abraham Zelmanov Journal, 2011, Vol. 4 (pages 36-71) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a reformulation of general relativity as a `generalized'
Yang--Mills theory of gravity, using a SO(3,C) gauge connection and the
self-dual Weyl tensor as dynamical variables. This formulation uses Plebanski's
theory as the starting point, and obtains a new action called the instanton
representation (IRPG).... | [
{
"created": "Thu, 8 Mar 2007 12:10:03 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Apr 2010 15:53:09 GMT",
"version": "v2"
},
{
"created": "Fri, 18 Mar 2011 06:18:18 GMT",
"version": "v3"
}
] | 2012-02-20 | [
[
"Ita",
"Eyo Eyo",
"III"
]
] | We present a reformulation of general relativity as a `generalized' Yang--Mills theory of gravity, using a SO(3,C) gauge connection and the self-dual Weyl tensor as dynamical variables. This formulation uses Plebanski's theory as the starting point, and obtains a new action called the instanton representation (IRPG). T... |
2102.00187 | Babak Vakili | Fatimah Tavakoli, Babak Vakili and Hossein Ardehali | Ho\v{r}ava-Lifshitz scalar field cosmology: classical and quantum
viewpoints | 17 pages, 12 figures, typos corrected, Refs. added, Final version | Adv. High Energy Phys. (2021), 6617910 | 10.1155/2021/6617910 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we study a projectable Ho\v{r}ava-Lifshitz cosmology without
the detailed balance condition minimally coupled to a non-linear self-coupling
scalar field. In the minisuperspace framework, the super Hamiltonian of the
presented model is constructed by means of which, some classical solutions for
scale fa... | [
{
"created": "Sat, 30 Jan 2021 08:42:49 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Feb 2021 14:15:05 GMT",
"version": "v2"
}
] | 2021-02-25 | [
[
"Tavakoli",
"Fatimah",
""
],
[
"Vakili",
"Babak",
""
],
[
"Ardehali",
"Hossein",
""
]
] | In this paper, we study a projectable Ho\v{r}ava-Lifshitz cosmology without the detailed balance condition minimally coupled to a non-linear self-coupling scalar field. In the minisuperspace framework, the super Hamiltonian of the presented model is constructed by means of which, some classical solutions for scale fact... |
1512.08198 | Rodrigo Turcati | Bethan Cropp, Stefano Liberati, Rodrigo Turcati | Vorticity in analogue gravity | 12 pages. Final version matching the published one in CQG | Class. Quantum Grav. 33 125009 (2016) | 10.1088/0264-9381/33/12/125009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the analogue gravity framework, the acoustic disturbances in a moving
fluid can be described by an equation of motion identical to a relativistic
scalar massless field propagating in a curved spacetime. This description is
possible only when the fluid under consideration is barotropic, inviscid and
irrotational. I... | [
{
"created": "Sun, 27 Dec 2015 10:33:20 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jun 2016 10:59:44 GMT",
"version": "v2"
}
] | 2016-06-06 | [
[
"Cropp",
"Bethan",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Turcati",
"Rodrigo",
""
]
] | In the analogue gravity framework, the acoustic disturbances in a moving fluid can be described by an equation of motion identical to a relativistic scalar massless field propagating in a curved spacetime. This description is possible only when the fluid under consideration is barotropic, inviscid and irrotational. In ... |
gr-qc/9710079 | Bernard F. Schutz | B. F. Schutz | Low-Frequency Sources of Gravitational Waves: A Tutorial | 12 pages, 2 figures | null | null | AEI-044(A) | gr-qc | null | Gravitational wave detectors in space, particularly the LISA project, can
study a rich variety of astronomical systems whose gravitational radiation is
not detectable from the ground, because it is emitted in the low-frequency
gravitational wave band (0.1 mHz to 1 Hz) that is inaccessible to ground-based
detectors. S... | [
{
"created": "Wed, 15 Oct 1997 09:18:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schutz",
"B. F.",
""
]
] | Gravitational wave detectors in space, particularly the LISA project, can study a rich variety of astronomical systems whose gravitational radiation is not detectable from the ground, because it is emitted in the low-frequency gravitational wave band (0.1 mHz to 1 Hz) that is inaccessible to ground-based detectors. Sou... |
gr-qc/0405042 | Clovis Jacinto de Matos | Orfeu Bertolami, Clovis Jacinto de Matos, Jean Christophe
Grenouilleau, Olivier Minster, Sergio Volonte | Perspectives in Fundamental Physics in Space | Gravitational waves, gravitomagnetism, Equivalence Principle,
Antimatter, Pioneer Anomaly, Lorentz invariance. To appear in IAA - Acta
Astronautica Journal (2006) | Acta Astronaut. 59 (2006) 490-498 | 10.1016/j.actaastro.2006.04.008 | null | gr-qc | null | We discuss the fundamental principles underlying the current physical
theories and the prospects of further improving their knowledge through
experiments in space.
| [
{
"created": "Fri, 7 May 2004 15:49:21 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jul 2006 13:27:35 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Bertolami",
"Orfeu",
""
],
[
"de Matos",
"Clovis Jacinto",
""
],
[
"Grenouilleau",
"Jean Christophe",
""
],
[
"Minster",
"Olivier",
""
],
[
"Volonte",
"Sergio",
""
]
] | We discuss the fundamental principles underlying the current physical theories and the prospects of further improving their knowledge through experiments in space. |
2311.14879 | Jos\'e Eloy Ottoni | E. Goulart and J. E. Ottoni | Remarks on the algebraic structure of (2, 2) double forms | null | null | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the algebraic features of covariant tensors of valence four
containing two blocks of skew indices. After a rather general treatment, we
specialize ourselves to four-dimensional spacetimes and discuss several
complementary aspects of these objects. In particular, we focus our attention
on the corresponding in... | [
{
"created": "Sat, 25 Nov 2023 00:03:21 GMT",
"version": "v1"
}
] | 2023-11-28 | [
[
"Goulart",
"E.",
""
],
[
"Ottoni",
"J. E.",
""
]
] | We study the algebraic features of covariant tensors of valence four containing two blocks of skew indices. After a rather general treatment, we specialize ourselves to four-dimensional spacetimes and discuss several complementary aspects of these objects. In particular, we focus our attention on the corresponding inva... |
1311.4853 | Mauricio Bellini | Jos\'e Edgar Madriz Aguilar, Claudia Moreno (Dept. of Mathematics,
CUCEI - UdG), Mauricio Bellini (Physics Department & IFIMAR - UNMdP &
CONICET) | The primordial explosion of a false white hole from a 5D vacuum | Final version to be published in PLB. arXiv admin note: substantial
text overlap with arXiv:1304.6982 | null | 10.1016/j.physletb.2013.12.005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the cosmological consequences of some possible big bang produced
by a black-hole with mass $M$ in an 5D extended SdS. Under these particular
circumstances, the effective 4D metric obtained by the use of a constant
foliation on the extra coordinate is comported as a false white-hole (FWH),
which evaporates ... | [
{
"created": "Tue, 19 Nov 2013 19:45:55 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Dec 2013 16:31:11 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Dec 2013 15:08:14 GMT",
"version": "v3"
}
] | 2015-06-17 | [
[
"Aguilar",
"José Edgar Madriz",
"",
"Dept. of Mathematics,\n CUCEI - UdG"
],
[
"Moreno",
"Claudia",
"",
"Dept. of Mathematics,\n CUCEI - UdG"
],
[
"Bellini",
"Mauricio",
"",
"Physics Department & IFIMAR - UNMdP &\n CONICET"
]
] | We explore the cosmological consequences of some possible big bang produced by a black-hole with mass $M$ in an 5D extended SdS. Under these particular circumstances, the effective 4D metric obtained by the use of a constant foliation on the extra coordinate is comported as a false white-hole (FWH), which evaporates fo... |
1610.08039 | Viraj Sanghai | Viraj A. A. Sanghai, Timothy Clifton | Parameterized Post-Newtonian Cosmology | 30 pages, no figures, v2: matches published version | Class. Quantum Grav. 34 (2017) 065003 | 10.1088/1361-6382/aa5d75 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein's theory of gravity has been extensively tested on solar system
scales, and for isolated astrophysical systems, using the perturbative
framework known as the parameterized post-Newtonian (PPN) formalism. This
framework is designed for use in the weak-field and slow-motion limit of
gravity, and can be used to... | [
{
"created": "Tue, 25 Oct 2016 19:46:12 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Feb 2017 21:39:07 GMT",
"version": "v2"
}
] | 2017-02-24 | [
[
"Sanghai",
"Viraj A. A.",
""
],
[
"Clifton",
"Timothy",
""
]
] | Einstein's theory of gravity has been extensively tested on solar system scales, and for isolated astrophysical systems, using the perturbative framework known as the parameterized post-Newtonian (PPN) formalism. This framework is designed for use in the weak-field and slow-motion limit of gravity, and can be used to c... |
gr-qc/0504128 | Hirotaka Takahashi | Stephen Fairhurst (for the LIGO Scientific Collaboration) and Hirotaka
Takahashi (for the TAMA Collaboration) | Status of the joint LIGO--TAMA300 inspiral analysis | 10 page, 8 figures, accepted for publication in Classical and Quantum
Gravity for the special issue of the GWDAW9 Proceedings ; Corrected typos,
minor changes | Class.Quant.Grav. 22 (2005) S1109-S1118 | 10.1088/0264-9381/22/18/S25 | OU-TAP 257 | gr-qc | null | We present the status of the joint search for gravitational waves from
inspiraling neutron star binaries in the LIGO Science Run 2 and TAMA300 Data
Taking Run 8 data, which was taken from February 14 to April 14, 2003, by the
LIGO and TAMA collaborations. In this paper we discuss what has been learned
from an analysi... | [
{
"created": "Tue, 26 Apr 2005 01:28:38 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jun 2005 04:25:51 GMT",
"version": "v2"
}
] | 2019-08-15 | [
[
"Fairhurst",
"Stephen",
"",
"for the LIGO Scientific Collaboration"
],
[
"Takahashi",
"Hirotaka",
"",
"for the TAMA Collaboration"
]
] | We present the status of the joint search for gravitational waves from inspiraling neutron star binaries in the LIGO Science Run 2 and TAMA300 Data Taking Run 8 data, which was taken from February 14 to April 14, 2003, by the LIGO and TAMA collaborations. In this paper we discuss what has been learned from an analysis ... |
1504.03883 | Bijan Saha Dr. | Bijan Saha | Nonlinear Spinor Fields in Bianchi type-$VI_0$ spacetime | 14 pages | Eur. Phys. J. Plus (2015) 130: 208 | 10.1140/epjp/i2015-15208-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within the scope of Bianchi type-$VI_0$ spacetime we study the role of spinor
field on the evolution of the Universe. It is found that the presence of
nontrivial non-diagonal components of energy-momentum tensor of the spinor
field plays vital role on the evolution of the Universe. As a result of their
mutual influen... | [
{
"created": "Wed, 15 Apr 2015 12:24:58 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Oct 2015 10:41:42 GMT",
"version": "v2"
}
] | 2015-10-21 | [
[
"Saha",
"Bijan",
""
]
] | Within the scope of Bianchi type-$VI_0$ spacetime we study the role of spinor field on the evolution of the Universe. It is found that the presence of nontrivial non-diagonal components of energy-momentum tensor of the spinor field plays vital role on the evolution of the Universe. As a result of their mutual influence... |
gr-qc/0603065 | Diego Julio Cirilo-Lombardo | D.J. Cirilo-Lombardo | New spherically symmetric monopole and regular solutions in
Einstein-Born-Infeld theories | Final version in journal. Amplied version with new results that
previous talk in Protvino workshop | J.Math.Phys.46:042501,2005 | 10.1063/1.1862308 | null | gr-qc hep-th | null | In this work a new asymptotically flat solution of the coupled
Einstein-Born-Infeld equations for a static spherically symmetric space-time is
obtained. When the intrinsic mass is zero the resulting spacetime is regular
everywhere, in the sense given by B. Hoffmann and L. Infeld in 1937, and the
Einstein-Born-Infeld ... | [
{
"created": "Thu, 16 Mar 2006 08:27:25 GMT",
"version": "v1"
}
] | 2010-01-15 | [
[
"Cirilo-Lombardo",
"D. J.",
""
]
] | In this work a new asymptotically flat solution of the coupled Einstein-Born-Infeld equations for a static spherically symmetric space-time is obtained. When the intrinsic mass is zero the resulting spacetime is regular everywhere, in the sense given by B. Hoffmann and L. Infeld in 1937, and the Einstein-Born-Infeld th... |
gr-qc/0003023 | Miguel Sabido | O. Obregon, M. Sabido, and V. I. Tkach | Entropy using Path Integrals for Quantum Black Hole Models | 7 pages, LaTeX, no figures | Gen.Rel.Grav.33:913-919,2001 | 10.1023/A:1010216126590 | null | gr-qc hep-th | null | Several eigenvalue equations that could describe quantum black holes have
been proposed in the canonical quantum gravity approach. In this paper, we
choose one of the simplest of these quantum equations to show how the usual
Feynman's path integral method can be applied to obtain the corresponding
statistical propert... | [
{
"created": "Wed, 8 Mar 2000 00:20:20 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2000 18:18:58 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Obregon",
"O.",
""
],
[
"Sabido",
"M.",
""
],
[
"Tkach",
"V. I.",
""
]
] | Several eigenvalue equations that could describe quantum black holes have been proposed in the canonical quantum gravity approach. In this paper, we choose one of the simplest of these quantum equations to show how the usual Feynman's path integral method can be applied to obtain the corresponding statistical propertie... |
1411.7871 | Cacciatori Sergio | F. Belgiorno, S.L. Cacciatori, F. Dalla Piazza | Tunneling approach and thermality in dispersive models of analogue
gravity | 18 pages and 1 figure | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We set up a tunneling approach to the analogue Hawking effect in the case of
models of analogue gravity which are affected by dispersive effects. An
effective Schroedinger-like equation for the basic scattering phenomenon
IN->P+N*, where IN is the incident mode, P is the positive norm reflected mode,
and N* is the ne... | [
{
"created": "Fri, 28 Nov 2014 14:01:04 GMT",
"version": "v1"
}
] | 2014-12-01 | [
[
"Belgiorno",
"F.",
""
],
[
"Cacciatori",
"S. L.",
""
],
[
"Piazza",
"F. Dalla",
""
]
] | We set up a tunneling approach to the analogue Hawking effect in the case of models of analogue gravity which are affected by dispersive effects. An effective Schroedinger-like equation for the basic scattering phenomenon IN->P+N*, where IN is the incident mode, P is the positive norm reflected mode, and N* is the nega... |
gr-qc/0612107 | Ozay Gurtug | Mustafa Halilsoy and Ozay Gurtug | Search For Gravitational Waves Through the Electromagnetic Faraday
Rotation | Final version. Minor revision, new figures and references are added.
To appear in Physical Review D | Phys.Rev.D75:124021,2007 | 10.1103/PhysRevD.75.124021 | null | gr-qc | null | A method is given which renders indirect detection of strong gravitational
waves possible. This is based on the reflection (collision) of a linearly
polarized electromagnetic shock wave from (with) a cross polarized impulsive
and shock gravitational waves in accordance with the general theory of
relativity. This high... | [
{
"created": "Mon, 18 Dec 2006 06:31:42 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jun 2007 11:18:54 GMT",
"version": "v2"
},
{
"created": "Wed, 13 Jun 2007 05:56:43 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Halilsoy",
"Mustafa",
""
],
[
"Gurtug",
"Ozay",
""
]
] | A method is given which renders indirect detection of strong gravitational waves possible. This is based on the reflection (collision) of a linearly polarized electromagnetic shock wave from (with) a cross polarized impulsive and shock gravitational waves in accordance with the general theory of relativity. This highly... |
1906.00450 | Gopi Kant Goswami Dr | G. K. Goswami, Anirudh Pradhan and A. Beesham | FLRW accelerating universe with interactive dark energy | 11 pages, 7 figures | Pramana-J. Phys. Vol. 93, No. 6, Dec (2019), 89 (9 pages) | 10.1007/s12043-019-1856-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have developed an accelerating cosmological model for the present universe
which is phantom for the period $ (0 \leq z \leq 1.99)$ and quintessence phase
for $(1.99 \leq z \leq 2.0315)$. The universe is assumed to be filled with
barotropic and dark energy(DE) perfect fluid in which DE interact with matter.
For a d... | [
{
"created": "Sun, 2 Jun 2019 16:57:41 GMT",
"version": "v1"
}
] | 2021-08-02 | [
[
"Goswami",
"G. K.",
""
],
[
"Pradhan",
"Anirudh",
""
],
[
"Beesham",
"A.",
""
]
] | We have developed an accelerating cosmological model for the present universe which is phantom for the period $ (0 \leq z \leq 1.99)$ and quintessence phase for $(1.99 \leq z \leq 2.0315)$. The universe is assumed to be filled with barotropic and dark energy(DE) perfect fluid in which DE interact with matter. For a dec... |
2309.05093 | Do\u{g}a Veske | Lavinia Heisenberg, David Maibach, Do\u{g}a Veske | Topological Dark Matter in LIGO Data | 13 pages with 12 figures. Comments are welcome | null | null | null | gr-qc astro-ph.CO astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the efforts of searching for dark matter, gravitational wave
interferometers have been recently proposed as a promising probe. These highly
sensitive instruments are potentially be able to detect the interactions of
dark matter with the detectors. In this work, we explored the possibilities of
discovering topologi... | [
{
"created": "Sun, 10 Sep 2023 17:38:56 GMT",
"version": "v1"
}
] | 2023-09-14 | [
[
"Heisenberg",
"Lavinia",
""
],
[
"Maibach",
"David",
""
],
[
"Veske",
"Doğa",
""
]
] | In the efforts of searching for dark matter, gravitational wave interferometers have been recently proposed as a promising probe. These highly sensitive instruments are potentially be able to detect the interactions of dark matter with the detectors. In this work, we explored the possibilities of discovering topologica... |
1411.7066 | Ramin G. Daghigh | Ramin G. Daghigh and Michael D. Green | High Overtone Quasinormal Modes of Analog Black Holes and the Small
Scale Structure of the Background Fluid | 14 pages, 3 figures | null | 10.1088/0264-9381/32/9/095003 | null | gr-qc cond-mat.other | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The goal of this paper is to build a foundation for, and explore the
possibility of, using high overtone quasinormal modes of analog black holes to
probe the small scale (microscopic) structure of a background fluid in which an
analog black hole is formed. This may provide a tool to study the small scale
structure of... | [
{
"created": "Tue, 25 Nov 2014 23:25:06 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Daghigh",
"Ramin G.",
""
],
[
"Green",
"Michael D.",
""
]
] | The goal of this paper is to build a foundation for, and explore the possibility of, using high overtone quasinormal modes of analog black holes to probe the small scale (microscopic) structure of a background fluid in which an analog black hole is formed. This may provide a tool to study the small scale structure of s... |
1708.07430 | Yusuf Kucukakca | Ganim Gecim and Yusuf Kucukakca | Scalar-Tensor Teleparallel Gravity With Boundary Term by Noether
Symmetries | 9 pages, 5 figures | null | 10.1142/S0219887818501517 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of teleparallel gravity, the Friedman-Robertson-Walker
cosmological model with scalar tensor theory where scalar field is
non-minimally coupled to both the torsion scalar and boundary term is studied.
Utilizing the Noether symmetry approach in such a theory, we obtain the
explicit forms of the coupli... | [
{
"created": "Thu, 24 Aug 2017 14:13:24 GMT",
"version": "v1"
}
] | 2018-08-29 | [
[
"Gecim",
"Ganim",
""
],
[
"Kucukakca",
"Yusuf",
""
]
] | In the framework of teleparallel gravity, the Friedman-Robertson-Walker cosmological model with scalar tensor theory where scalar field is non-minimally coupled to both the torsion scalar and boundary term is studied. Utilizing the Noether symmetry approach in such a theory, we obtain the explicit forms of the coupling... |
1107.1034 | Mehrdad Farhoudi Prof. | Mehrdad Farhoudi | Third Order Lagrangians, Weyl Invariants & Classical Trace Anomaly in
Six Dimensions | 26 pages, appendix and references added | Inter. J. Theor. Phys. Vol. 52, 4110-4138 (2013) | 10.1007/s10773-013-1725-x | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have proceeded analogy of Einstein tensor and alternative form of Einstein
field equations for generic coeffcients of eight terms in third order of
Lovelock Lagrangian. We have found constraint between the coeffcients into two
forms, an independent and a dimensional dependent versions. Each form has three
degrees ... | [
{
"created": "Wed, 6 Jul 2011 06:42:21 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Aug 2011 15:09:56 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Aug 2013 13:46:01 GMT",
"version": "v3"
}
] | 2013-10-04 | [
[
"Farhoudi",
"Mehrdad",
""
]
] | We have proceeded analogy of Einstein tensor and alternative form of Einstein field equations for generic coeffcients of eight terms in third order of Lovelock Lagrangian. We have found constraint between the coeffcients into two forms, an independent and a dimensional dependent versions. Each form has three degrees of... |
2009.11894 | Oleg Zaslavskii | O. B. Zaslavskii | New scenarios of high-energy particle collisions near wormholes | 13 pages. One more scenario considered, ref. 15 added. To appear in
Universe (special issue on wormholes) | Universe 6, 227 (2020) | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest two new scenarios of high-energy particle collisions in the
background of a wormhole. In scenario 1 the novelty consists in that the effect
does not require two particles coming from different mouths. Instead, all such
scenarios of high energy collisions develop, when an experimenter sends
particles toward... | [
{
"created": "Thu, 24 Sep 2020 18:37:57 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Sep 2020 18:07:01 GMT",
"version": "v2"
},
{
"created": "Fri, 27 Nov 2020 11:47:46 GMT",
"version": "v3"
}
] | 2020-12-01 | [
[
"Zaslavskii",
"O. B.",
""
]
] | We suggest two new scenarios of high-energy particle collisions in the background of a wormhole. In scenario 1 the novelty consists in that the effect does not require two particles coming from different mouths. Instead, all such scenarios of high energy collisions develop, when an experimenter sends particles towards ... |
2206.03500 | Maximilian Koegler | Ottavia Balducci, Stefan Hofmann, Maximilian Koegler | Dark Matter Jets of Rotating Black Holes | 5 pages, 3 figures | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a novel approach which produces Dark Matter jets along the
rotation axis of Kerr black holes utilizing the Penrose process. The properties
of these jets are investigated, as well as their potential to create Dark
Matter overdensities in the solar system and in the vicinity of the black hole.
We discover a ... | [
{
"created": "Tue, 7 Jun 2022 18:00:00 GMT",
"version": "v1"
}
] | 2022-06-09 | [
[
"Balducci",
"Ottavia",
""
],
[
"Hofmann",
"Stefan",
""
],
[
"Koegler",
"Maximilian",
""
]
] | We present a novel approach which produces Dark Matter jets along the rotation axis of Kerr black holes utilizing the Penrose process. The properties of these jets are investigated, as well as their potential to create Dark Matter overdensities in the solar system and in the vicinity of the black hole. We discover a hi... |
1204.1401 | Xin-Zhou Li | Xin-zhou Li, Ping Xi, Qun Zhang | Gravitating tensor monopole in a Lorentz-violating field theory | 5 pages, 4 figures | Phys. Rev. D85:085030,2012 | 10.1103/physRevD.85.085030 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a solution of the coupled Einstein and rank-two antisymmetric
tensor field equations where Lorentz symmetry is spontaneously broken, and we
discuss its observational signatures. Especially, the deflection angles have
important qualitative differences between tensor and scalar monopoles. If a
monopole were ... | [
{
"created": "Fri, 6 Apr 2012 03:25:27 GMT",
"version": "v1"
}
] | 2012-04-30 | [
[
"Li",
"Xin-zhou",
""
],
[
"Xi",
"Ping",
""
],
[
"Zhang",
"Qun",
""
]
] | We present a solution of the coupled Einstein and rank-two antisymmetric tensor field equations where Lorentz symmetry is spontaneously broken, and we discuss its observational signatures. Especially, the deflection angles have important qualitative differences between tensor and scalar monopoles. If a monopole were to... |
2011.10836 | Marco Maceda | Daniel Flores-Alfonso and Blanca Ang\'elica Gonz\'alez-Morales and
Rom\'an Linares and Marco Maceda | Black holes and gravitational waves sourced by non-linear duality
rotation-invariant conformal electromagnetic matter | 9 pages, 1 figure | Phys. Lett. B 812 (2021) 136011 | 10.1016/j.physletb.2020.136011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Maxwell's equations are invariant under both duality rotations and conformal
transformations. Recently Bandos, Lechner, Sorokin, and Townsend have found a
nonlinear generalisation of electrodynamics which possesses both of these
symmetries. We couple this theory to General Relativity and explore
self-gravitating conf... | [
{
"created": "Sat, 21 Nov 2020 18:20:49 GMT",
"version": "v1"
}
] | 2020-12-14 | [
[
"Flores-Alfonso",
"Daniel",
""
],
[
"González-Morales",
"Blanca Angélica",
""
],
[
"Linares",
"Román",
""
],
[
"Maceda",
"Marco",
""
]
] | Maxwell's equations are invariant under both duality rotations and conformal transformations. Recently Bandos, Lechner, Sorokin, and Townsend have found a nonlinear generalisation of electrodynamics which possesses both of these symmetries. We couple this theory to General Relativity and explore self-gravitating config... |
1008.3111 | Peter K.F. Kuhfittig | Peter K. F. Kuhfittig | The stability of thin-shell wormholes with a phantom-like equation of
state | 7 pages, 4 figures | Acta Phys.Polon.B41:2017-2019,2010 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper discusses the stability to linearized radial perturbations of
spherically symmetric thin-shell wormholes with a "phantom-like" equation of
state for the exotic matter at the throat: $P=\omega\sigma$, $\omega<0$, where
$\sigma$ is the energy-density of the shell and $P$ the surface pressure. This
equation i... | [
{
"created": "Wed, 18 Aug 2010 15:25:44 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Oct 2010 23:41:53 GMT",
"version": "v2"
},
{
"created": "Sun, 15 Apr 2012 21:11:27 GMT",
"version": "v3"
},
{
"created": "Thu, 9 Jun 2016 14:01:20 GMT",
"version": "v4"
}
] | 2016-06-10 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | This paper discusses the stability to linearized radial perturbations of spherically symmetric thin-shell wormholes with a "phantom-like" equation of state for the exotic matter at the throat: $P=\omega\sigma$, $\omega<0$, where $\sigma$ is the energy-density of the shell and $P$ the surface pressure. This equation is ... |
1812.01993 | Jae-Weon Lee Prof. | Jae-Weon Lee, Hyeong-Chan Kim, Jungjai Lee | Holographic Dark Energy and Quantum Entanglement | to be published in JKPS | Journal of the Korean Physical Society, Volume 74, Issue 1, pp 1
(2019) | 10.3938/jkps.74.1 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we briefly review the holographic dark energy model and
introduce the idea that dark energy is a kind of thermal energy related to the
quantum entanglement of the vacuum across a cosmic future event horizon. The
holographic dark energy model comes from a theoretical attempt to apply the
holographic pri... | [
{
"created": "Mon, 3 Dec 2018 04:46:59 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Dec 2018 02:56:39 GMT",
"version": "v2"
}
] | 2019-01-30 | [
[
"Lee",
"Jae-Weon",
""
],
[
"Kim",
"Hyeong-Chan",
""
],
[
"Lee",
"Jungjai",
""
]
] | In this paper, we briefly review the holographic dark energy model and introduce the idea that dark energy is a kind of thermal energy related to the quantum entanglement of the vacuum across a cosmic future event horizon. The holographic dark energy model comes from a theoretical attempt to apply the holographic princ... |
1109.6201 | Matteo Luca Ruggiero | Angelo Tartaglia, Matteo Luca Ruggiero, Emiliano Capolongo | A relativistic navigation system for space | 11 pages | Acta Futura 4 (2011) 33.40 | 10.2420/AF04.2011.33 | null | gr-qc physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present here a method for the relativistic positioning in spacetime based
on the reception of pulses from sources of electromagnetic signals whose
worldline is known. The method is based on the use of a four-dimensional grid
covering the whole spacetime and made of the null hypersurfaces representing
the propagati... | [
{
"created": "Wed, 28 Sep 2011 13:34:12 GMT",
"version": "v1"
}
] | 2011-09-29 | [
[
"Tartaglia",
"Angelo",
""
],
[
"Ruggiero",
"Matteo Luca",
""
],
[
"Capolongo",
"Emiliano",
""
]
] | We present here a method for the relativistic positioning in spacetime based on the reception of pulses from sources of electromagnetic signals whose worldline is known. The method is based on the use of a four-dimensional grid covering the whole spacetime and made of the null hypersurfaces representing the propagating... |
0908.0779 | Cristian R. Ghezzi | Cristian R. Ghezzi | Anisotropic dark energy stars | 12 pages, 6 figures, final manuscript, Accepted for publication in
Astrophysics & Space Science | Astrophys.Space Sci.333:437-447,2011 | 10.1007/s10509-011-0663-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model of compact object coupled to inhomogeneous anisotropic dark energy is
studied. It is assumed a variable dark energy that suffers a phase transition
at a critical density. The anisotropic Lambda-Tolman-Oppenheimer-Volkoff
equations are integrated to know the structure of these objects. The anisotropy
is concen... | [
{
"created": "Thu, 6 Aug 2009 01:16:13 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Sep 2009 01:55:23 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Feb 2011 23:17:26 GMT",
"version": "v3"
}
] | 2011-05-12 | [
[
"Ghezzi",
"Cristian R.",
""
]
] | A model of compact object coupled to inhomogeneous anisotropic dark energy is studied. It is assumed a variable dark energy that suffers a phase transition at a critical density. The anisotropic Lambda-Tolman-Oppenheimer-Volkoff equations are integrated to know the structure of these objects. The anisotropy is concentr... |
1509.09197 | Javier Olmedo | Javier Olmedo, Daniel Mart\'in de Blas and Tomasz Paw{\l}owski | Local rotational symmetry Gowdy model in Loop Quantum Gravity | 5 pages, new version adapted to the MG14 proceeding, title and
abstract changed | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a complete quantization for the Gowdy model with local rotational
symmetry in vacuum. We start with a redefinition of the classical constraint
algebra such that the Hamiltonian constraint has a vanishing Poisson bracket
with itself. We apply a canonical quantization within loop quantum gravity and
an impro... | [
{
"created": "Wed, 30 Sep 2015 14:44:59 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jun 2017 16:21:16 GMT",
"version": "v2"
}
] | 2017-06-21 | [
[
"Olmedo",
"Javier",
""
],
[
"de Blas",
"Daniel Martín",
""
],
[
"Pawłowski",
"Tomasz",
""
]
] | We provide a complete quantization for the Gowdy model with local rotational symmetry in vacuum. We start with a redefinition of the classical constraint algebra such that the Hamiltonian constraint has a vanishing Poisson bracket with itself. We apply a canonical quantization within loop quantum gravity and an improve... |
0704.3485 | Xing-Hao Ye | Xing-Hao Ye, Qiang Lin | A Simple Optical Analysis of Gravitational Lensing | 4 pages, 6 figures | null | 10.1080/09500340701618395 | null | gr-qc | null | We analyzed the influence of static gravitational field on the vacuum and
proposed the concept of inhomogeneous vacuum. According to the corresponding
Fermat's principle in the general relativity, we derived a graded refractive
index of vacuum in a static gravitational field. We found that the light
deflection in a g... | [
{
"created": "Thu, 26 Apr 2007 12:07:47 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Ye",
"Xing-Hao",
""
],
[
"Lin",
"Qiang",
""
]
] | We analyzed the influence of static gravitational field on the vacuum and proposed the concept of inhomogeneous vacuum. According to the corresponding Fermat's principle in the general relativity, we derived a graded refractive index of vacuum in a static gravitational field. We found that the light deflection in a gra... |
1403.2623 | Kourosh Nozari | M. A. Gorji, K. Nozari and B. Vakili | Spacetime singularity resolution in Snyder noncommutative space | 11 pages, 4 figures, Revised for PRD, title changed | Phys. Rev. D 89, 084072 (2014) | 10.1103/PhysRevD.89.084072 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by quantum gravity proposal, we construct a deformed phase space
which supports the UV and IR cutoffs. We show that the Liouville theorem is
satisfied in the deformed phase space which allows us to formulate the
thermodynamics of the early Universe in the semiclassical regime. Applying the
proposed method to... | [
{
"created": "Tue, 11 Mar 2014 16:01:59 GMT",
"version": "v1"
},
{
"created": "Sun, 18 May 2014 15:53:42 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Gorji",
"M. A.",
""
],
[
"Nozari",
"K.",
""
],
[
"Vakili",
"B.",
""
]
] | Inspired by quantum gravity proposal, we construct a deformed phase space which supports the UV and IR cutoffs. We show that the Liouville theorem is satisfied in the deformed phase space which allows us to formulate the thermodynamics of the early Universe in the semiclassical regime. Applying the proposed method to t... |
1901.10448 | Artur Sergyeyev | A. Sergyeyev, A. Wojnar | The Palatini star: exact solutions of the modified Lane-Emden equation | 6 pages, 1 figure | null | 10.1140/epjc/s10052-020-7876-z | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two exact solutions for $n=0$ and $n=1$ of the Palatini-modified Lane-Emden
equation are found. We have employed these solutions to describe a
Palatini-Newtonian neutron star and compared the result with the pure Newtonian
counterpart. It turned out that for the negative parameter of the Starobinsky
model the star is... | [
{
"created": "Tue, 29 Jan 2019 18:54:54 GMT",
"version": "v1"
}
] | 2020-04-22 | [
[
"Sergyeyev",
"A.",
""
],
[
"Wojnar",
"A.",
""
]
] | Two exact solutions for $n=0$ and $n=1$ of the Palatini-modified Lane-Emden equation are found. We have employed these solutions to describe a Palatini-Newtonian neutron star and compared the result with the pure Newtonian counterpart. It turned out that for the negative parameter of the Starobinsky model the star is h... |
1603.06206 | Seema Satin | Seema Satin, H.T.Cho, Bei Lok Hu | Conformally-related Einstein-Langevin equations for metric fluctuations
in stochastic gravity | null | Phys. Rev. D 94, 064019 (2016) | 10.1103/PhysRevD.94.064019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a conformally-coupled scalar field we obtain the conformally-related
Einstein-Langevin equations, using appropriate transformations for all the
quantities in the equations between two conformally-related spacetimes. In
particular, we analyze the transformations of the influence action, the stress
energy tensor, t... | [
{
"created": "Sun, 20 Mar 2016 12:03:23 GMT",
"version": "v1"
}
] | 2016-09-14 | [
[
"Satin",
"Seema",
""
],
[
"Cho",
"H. T.",
""
],
[
"Hu",
"Bei Lok",
""
]
] | For a conformally-coupled scalar field we obtain the conformally-related Einstein-Langevin equations, using appropriate transformations for all the quantities in the equations between two conformally-related spacetimes. In particular, we analyze the transformations of the influence action, the stress energy tensor, the... |
1011.1916 | Lorenzo Iorio | Lorenzo Iorio | Dynamical orbital effects of General Relativity on the
satellite-to-satellite range and range-rate in the GRACE mission: a
sensitivity analysis | LaTex, 24 pages, 5 figures, 9 tables. Accepted for publication in
Advances in Space Research (ASR) | Adv.Sp.Res.50:334-345,2012 | 10.1016/j.asr.2012.04.012 | null | gr-qc astro-ph.EP hep-ph physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We numerically investigate the impact of GTR on the orbital part of the
satellite-to-satellite range \rho and range-rate \dot\rho of the twin GRACE A/B
spacecrafts through their dynamical equations of motion integrated in an
Earth-centered frame over a time span \Delta t=1 d. Instead, the GTR effects
connected with t... | [
{
"created": "Mon, 8 Nov 2010 21:07:23 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Nov 2010 09:58:24 GMT",
"version": "v2"
},
{
"created": "Sun, 6 Mar 2011 11:31:19 GMT",
"version": "v3"
},
{
"created": "Sat, 29 Oct 2011 17:28:01 GMT",
"version": "v4"
},
{
"cre... | 2012-06-12 | [
[
"Iorio",
"Lorenzo",
""
]
] | We numerically investigate the impact of GTR on the orbital part of the satellite-to-satellite range \rho and range-rate \dot\rho of the twin GRACE A/B spacecrafts through their dynamical equations of motion integrated in an Earth-centered frame over a time span \Delta t=1 d. Instead, the GTR effects connected with the... |
gr-qc/9503002 | Arlen Anderson | Arlen Anderson | Unitarity Restoration for the Product of Nonunitary Operators | 5 pages, LaTeX. | null | null | null | gr-qc | null | A proof is given that the polar decomposition procedure for unitarity
restoration works for products of invertible nonunitary operators. A brief
discussion follows that the unitarity restoration procedure, applied to
propagators in spacetimes containing closed timelike curves, is analogous to
the original introductio... | [
{
"created": "Wed, 1 Mar 1995 18:59:12 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Anderson",
"Arlen",
""
]
] | A proof is given that the polar decomposition procedure for unitarity restoration works for products of invertible nonunitary operators. A brief discussion follows that the unitarity restoration procedure, applied to propagators in spacetimes containing closed timelike curves, is analogous to the original introduction ... |
1008.5169 | Alexey Krugly | Alexey L. Krugly | Discrete mechanics: a kinematics for a particular case of causal sets | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The model is a particular case of causal set. This is a discrete model of
spacetime in a microscopic level. In paper the most general properties of the
model are investigated without any reference to a dynamics. The dynamics of the
model is introduced in [arXiv: 1004.5077]. These two papers introduce a
consistent des... | [
{
"created": "Mon, 30 Aug 2010 21:15:23 GMT",
"version": "v1"
}
] | 2010-09-01 | [
[
"Krugly",
"Alexey L.",
""
]
] | The model is a particular case of causal set. This is a discrete model of spacetime in a microscopic level. In paper the most general properties of the model are investigated without any reference to a dynamics. The dynamics of the model is introduced in [arXiv: 1004.5077]. These two papers introduce a consistent descr... |
gr-qc/0608092 | Cristian Stelea | Brenda Chng, Robert Mann and Cristian Stelea | Accelerating Taub-NUT and Eguchi-Hanson solitons in four dimensions | 16 pages | Phys.Rev.D74:084031,2006 | 10.1103/PhysRevD.74.084031 | null | gr-qc | null | We construct new solutions of the vacuum Einstein field equations in four
dimensions via a solution generating method utilizing the SL(2,R) symmetry of
the reduced Lagrangian. We apply the method to an accelerating version of the
Zipoy-Voorhees solution and generate new solutions which we interpret to be the
accelera... | [
{
"created": "Sat, 19 Aug 2006 00:11:46 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Chng",
"Brenda",
""
],
[
"Mann",
"Robert",
""
],
[
"Stelea",
"Cristian",
""
]
] | We construct new solutions of the vacuum Einstein field equations in four dimensions via a solution generating method utilizing the SL(2,R) symmetry of the reduced Lagrangian. We apply the method to an accelerating version of the Zipoy-Voorhees solution and generate new solutions which we interpret to be the accelerati... |
2312.07074 | Zheng-Wen Long | Dong Liu, Yi Yang, Zheng-Wen Long | Probing the black holes in a dark matter halo of M87 using gravitational
wave echoes | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Variations at the event horizon structure of a black hole will emit the
signals of the gravitational wave echoes associated with the ringdown phase of
the binary black hole merger. In this work, combining the mass model of M87 and
the Einasto profile for a dark matter halo, we construct one solution of the
black hole... | [
{
"created": "Tue, 12 Dec 2023 08:52:14 GMT",
"version": "v1"
}
] | 2023-12-13 | [
[
"Liu",
"Dong",
""
],
[
"Yang",
"Yi",
""
],
[
"Long",
"Zheng-Wen",
""
]
] | Variations at the event horizon structure of a black hole will emit the signals of the gravitational wave echoes associated with the ringdown phase of the binary black hole merger. In this work, combining the mass model of M87 and the Einasto profile for a dark matter halo, we construct one solution of the black holes ... |
2004.07959 | Ujjal Debnath | I. G. Salako, M. Khlopov, Saibal Ray, M. Z. Arouko, Pameli Saha, Ujjal
Debnath | Study on anisotropic strange stars in $f(\mathbb{T},\mathcal{T})$
gravity | 16 pages, 19 figures | null | 10.1134/S0040577921090105 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we study the existence of strange star in the background of
$f(\mathbb{T},\mathcal{T})$ gravity in the Einstein spacetime geometry, where
$\mathbb{T}$ is the torsion tensor and $\mathcal{T}$ is the trace of the
energy-momentum tensor. The equations of motion are derived for anisotropic
pressure within t... | [
{
"created": "Wed, 15 Apr 2020 07:03:14 GMT",
"version": "v1"
}
] | 2021-10-13 | [
[
"Salako",
"I. G.",
""
],
[
"Khlopov",
"M.",
""
],
[
"Ray",
"Saibal",
""
],
[
"Arouko",
"M. Z.",
""
],
[
"Saha",
"Pameli",
""
],
[
"Debnath",
"Ujjal",
""
]
] | In this work, we study the existence of strange star in the background of $f(\mathbb{T},\mathcal{T})$ gravity in the Einstein spacetime geometry, where $\mathbb{T}$ is the torsion tensor and $\mathcal{T}$ is the trace of the energy-momentum tensor. The equations of motion are derived for anisotropic pressure within the... |
1708.02113 | Nicola Franchini | Nicola Franchini, Andrew Coates, Thomas P. Sotiriou | Constructing Neutron Stars with a Gravitational Higgs Mechanism | 8 pages, 5 figures | Phys. Rev. D 97, 064013 (2018) | 10.1103/PhysRevD.97.064013 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In scalar-tensor theories, spontaneous scalarization is a phase transition
that can occur in ultra-dense environments such as neutron stars. The scalar
field develops a non-trivial configuration once the stars exceeds a compactness
threshold. We recently pointed out that, if the scalar exhibits some additional
coupli... | [
{
"created": "Mon, 7 Aug 2017 13:31:04 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Mar 2018 14:33:38 GMT",
"version": "v2"
}
] | 2018-03-21 | [
[
"Franchini",
"Nicola",
""
],
[
"Coates",
"Andrew",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | In scalar-tensor theories, spontaneous scalarization is a phase transition that can occur in ultra-dense environments such as neutron stars. The scalar field develops a non-trivial configuration once the stars exceeds a compactness threshold. We recently pointed out that, if the scalar exhibits some additional coupling... |
0806.1426 | M. Hossein Dehghani | M. H. Dehghani and N. Farhangkhah | Asymptotically Flat Radiating Solutions in Third Order Lovelock Gravity | 15 pages, no figure, references added, two appendix added | Phys.Rev.D78:064015,2008 | 10.1103/PhysRevD.78.064015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we present an exact spherically symmetric solution of third
order Lovelock gravity in $n$ dimensions which describes the gravitational
collapse of a null dust fluid. This solution is asymptotically (anti-)de Sitter
or flat depending on the choice of the cosmological constant. Using the
asymptotically f... | [
{
"created": "Mon, 9 Jun 2008 11:21:00 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Aug 2008 12:20:48 GMT",
"version": "v2"
}
] | 2009-02-20 | [
[
"Dehghani",
"M. H.",
""
],
[
"Farhangkhah",
"N.",
""
]
] | In this paper, we present an exact spherically symmetric solution of third order Lovelock gravity in $n$ dimensions which describes the gravitational collapse of a null dust fluid. This solution is asymptotically (anti-)de Sitter or flat depending on the choice of the cosmological constant. Using the asymptotically fla... |
1502.02256 | Sai Wang | Xin Li, Sai Wang, Zhe Chang | Anisotropic inflation in Finsler spacetime | 15 pages, 8 figures. Minor revision | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest the universe is Finslerian in the stage of inflation. The
Finslerian background spacetime breaks rotational symmetry and induces parity
violation. The primordial power spectrum is given for quantum fluctuation of
the inflation field. It depends not only on the magnitude of wavenumber but
also on the prefer... | [
{
"created": "Sun, 8 Feb 2015 14:51:21 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Feb 2015 09:42:23 GMT",
"version": "v2"
}
] | 2015-02-16 | [
[
"Li",
"Xin",
""
],
[
"Wang",
"Sai",
""
],
[
"Chang",
"Zhe",
""
]
] | We suggest the universe is Finslerian in the stage of inflation. The Finslerian background spacetime breaks rotational symmetry and induces parity violation. The primordial power spectrum is given for quantum fluctuation of the inflation field. It depends not only on the magnitude of wavenumber but also on the preferre... |
1107.3083 | Niall \'O Murchadha | G. Waxenegger, R. Beig, N.\'O Murchadha | Existence and uniqueness of Bowen-York Trumpets | This corresponds to the published version in Class. Quantum Grav. 28
(2011) 245002 | Class. Quantum Grav. 28 (2011) 245002 | 10.1088/0264-9381/28/24/245002 | UWThPh-2011-23 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the existence of initial data sets which possess an asymptotically
flat and an asymptotically cylindrical end. Such geometries are known as
trumpets in the community of numerical relativists.
| [
{
"created": "Fri, 15 Jul 2011 14:55:02 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jan 2012 16:58:27 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Waxenegger",
"G.",
""
],
[
"Beig",
"R.",
""
],
[
"Murchadha",
"N. Ó",
""
]
] | We prove the existence of initial data sets which possess an asymptotically flat and an asymptotically cylindrical end. Such geometries are known as trumpets in the community of numerical relativists. |
gr-qc/0311064 | T. Roy Choudhury | T. Roy Choudhury, T. Padmanabhan | Quasi normal modes in Schwarzschild-DeSitter spacetime: A simple
derivation of the level spacing of the frequencies | Revised version. Accepted in Phys. Rev. D | Phys.Rev. D69 (2004) 064033 | 10.1103/PhysRevD.69.064033 | null | gr-qc astro-ph hep-th | null | It is known that the imaginary parts of the quasi normal mode (QNM)
frequencies for the Schwarzschild black hole are evenly spaced with a spacing
that depends only on the surface gravity. On the other hand, for massless
minimally coupled scalar fields, there exist no QNMs in the pure DeSitter
spacetime. It is not cle... | [
{
"created": "Thu, 20 Nov 2003 09:10:29 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jan 2004 14:12:16 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Choudhury",
"T. Roy",
""
],
[
"Padmanabhan",
"T.",
""
]
] | It is known that the imaginary parts of the quasi normal mode (QNM) frequencies for the Schwarzschild black hole are evenly spaced with a spacing that depends only on the surface gravity. On the other hand, for massless minimally coupled scalar fields, there exist no QNMs in the pure DeSitter spacetime. It is not clear... |
0907.4165 | Yerko Vasquez | P.A. Gonz\'alez and Yerko V\'asquez | Exact solutions in 3D gravity with torsion | 21 pages, no figures, version that matches the published one | JHEP 1108:089,2011 | 10.1007/JHEP08(2011)089 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the three-dimensional gravity with torsion given by the
Mielke-Baekler (MB) model coupled to gravitational Chern-Simons term, and that
possess electric charge described by Maxwell-Chern-Simons electrodynamics. We
find and discuss this theory's charged black holes solutions and uncharged
solutions. We find th... | [
{
"created": "Thu, 23 Jul 2009 20:43:58 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Aug 2009 08:42:24 GMT",
"version": "v2"
},
{
"created": "Wed, 30 Mar 2011 13:13:11 GMT",
"version": "v3"
},
{
"created": "Wed, 20 Apr 2011 14:47:41 GMT",
"version": "v4"
},
{
"cr... | 2011-10-03 | [
[
"González",
"P. A.",
""
],
[
"Vásquez",
"Yerko",
""
]
] | We study the three-dimensional gravity with torsion given by the Mielke-Baekler (MB) model coupled to gravitational Chern-Simons term, and that possess electric charge described by Maxwell-Chern-Simons electrodynamics. We find and discuss this theory's charged black holes solutions and uncharged solutions. We find that... |
2111.11020 | I-Ching Yang | I-Ching Yang | The Einstein and M{\o}ller energy-momentum complexes in post-Newtonian
approximation | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In the first and second post-Newtonian approximation of the Schwarzschild
metric, I obtain the energy component of the Einstein and M{\o}ller
energy-momentum complex. Both energies involve the rest-mass energy $m$, the
energy stored in the configuration and that in the gravitational field, but the
energies of Schwarz... | [
{
"created": "Mon, 22 Nov 2021 07:07:33 GMT",
"version": "v1"
}
] | 2021-11-23 | [
[
"Yang",
"I-Ching",
""
]
] | In the first and second post-Newtonian approximation of the Schwarzschild metric, I obtain the energy component of the Einstein and M{\o}ller energy-momentum complex. Both energies involve the rest-mass energy $m$, the energy stored in the configuration and that in the gravitational field, but the energies of Schwarzsc... |
2205.10523 | Hajime Sotani | Hajime Sotani | Accuracy of one-dimensional approximation in neutron star quasi-normal
modes | accepted in EPJC | null | 10.1140/epjc/s10052-022-10439-1 | RIKEN-iTHEMS-Report-22 | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | Since the eigenfrequency of gravitational waves from cold neutron stars
becomes a complex number, where the real and imaginary parts respectively
correspond to an oscillation frequency and damping rate, one has to somehow
solve the eigenvalue problem concerning the eigenvalue in two-dimensional
parameter space. To av... | [
{
"created": "Sat, 21 May 2022 07:29:33 GMT",
"version": "v1"
}
] | 2022-06-08 | [
[
"Sotani",
"Hajime",
""
]
] | Since the eigenfrequency of gravitational waves from cold neutron stars becomes a complex number, where the real and imaginary parts respectively correspond to an oscillation frequency and damping rate, one has to somehow solve the eigenvalue problem concerning the eigenvalue in two-dimensional parameter space. To avoi... |
1805.09796 | Gerard Clement | G\'erard Cl\'ement and Khireddine Nouicer | Hairy black hole solutions in a three-dimensional Galileon model | 21 pages. Title changed. Revised version published in CQG | Classical and Quantum Gravity 35 (2018) 185010 | 10.1088/1361-6382/aad84a | LAPTH-016/18 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate stationary rotationally symmetric solutions of a particular
truncation of Horndeski theory in three dimensions, including a non-minimal
scalar kinetic coupling to the curvature. After discussing the special case of
a vanishing scalar charge, which includes most of the previously known
solutions, we red... | [
{
"created": "Thu, 24 May 2018 17:40:51 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Aug 2018 12:32:37 GMT",
"version": "v2"
}
] | 2018-08-28 | [
[
"Clément",
"Gérard",
""
],
[
"Nouicer",
"Khireddine",
""
]
] | We investigate stationary rotationally symmetric solutions of a particular truncation of Horndeski theory in three dimensions, including a non-minimal scalar kinetic coupling to the curvature. After discussing the special case of a vanishing scalar charge, which includes most of the previously known solutions, we reduc... |
2312.17706 | Philippe G. LeFloch | Bruno Le Floch and Philippe G. LeFloch | Optimal localization for the Einstein constraints | 91 pages | null | null | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider asymptotically Euclidean, initial data sets for Einstein's field
equations and solve the localization problem at infinity, also called gluing
problem. We achieve optimal gluing and optimal decay, in the sense that we
encompass solutions with possibly arbitrarily low decay at infinity and
establish (super-... | [
{
"created": "Fri, 29 Dec 2023 17:50:28 GMT",
"version": "v1"
}
] | 2024-01-01 | [
[
"Floch",
"Bruno Le",
""
],
[
"LeFloch",
"Philippe G.",
""
]
] | We consider asymptotically Euclidean, initial data sets for Einstein's field equations and solve the localization problem at infinity, also called gluing problem. We achieve optimal gluing and optimal decay, in the sense that we encompass solutions with possibly arbitrarily low decay at infinity and establish (super-)h... |
1412.8247 | Lin-Qing Chen | Andrzej Banburski, Lin-Qing Chen, Laurent Freidel, Jeff Hnybida | Pachner moves in a 4d Riemannian holomorphic Spin Foam model | 48 pages, 30 figures | Phys. Rev. D 92, 124014 (2015) | 10.1103/PhysRevD.92.124014 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study a Spin Foam model for 4d Riemannian gravity, and
propose a new way of imposing the simplicity constraints that uses the recently
developed holomorphic representation. Using the power of the holomorphic
integration techniques, and with the introduction of two new tools: the
homogeneity map and th... | [
{
"created": "Mon, 29 Dec 2014 02:36:57 GMT",
"version": "v1"
}
] | 2015-12-16 | [
[
"Banburski",
"Andrzej",
""
],
[
"Chen",
"Lin-Qing",
""
],
[
"Freidel",
"Laurent",
""
],
[
"Hnybida",
"Jeff",
""
]
] | In this work we study a Spin Foam model for 4d Riemannian gravity, and propose a new way of imposing the simplicity constraints that uses the recently developed holomorphic representation. Using the power of the holomorphic integration techniques, and with the introduction of two new tools: the homogeneity map and the ... |
1502.03808 | Kip S. Thorne | Oliver James, Eugenie von Tunzelmann, Paul Franklin, and Kip S. Thorne | Gravitational Lensing by Spinning Black Holes in Astrophysics, and in
the Movie Interstellar | 46 pages, 17 figures | Classical and Quantum Gravity 32 (2015) 065001 | 10.1088/0264-9381/32/6/065001 | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by-nc-sa/3.0/ | Interstellar is the first Hollywood movie to attempt depicting a black hole
as it would actually be seen by somebody nearby. For this we developed a code
called DNGR (Double Negative Gravitational Renderer) to solve the equations for
ray-bundle (light-beam) propagation through the curved spacetime of a spinning
(Kerr... | [
{
"created": "Thu, 12 Feb 2015 20:56:05 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Feb 2015 04:19:05 GMT",
"version": "v2"
}
] | 2015-02-17 | [
[
"James",
"Oliver",
""
],
[
"von Tunzelmann",
"Eugenie",
""
],
[
"Franklin",
"Paul",
""
],
[
"Thorne",
"Kip S.",
""
]
] | Interstellar is the first Hollywood movie to attempt depicting a black hole as it would actually be seen by somebody nearby. For this we developed a code called DNGR (Double Negative Gravitational Renderer) to solve the equations for ray-bundle (light-beam) propagation through the curved spacetime of a spinning (Kerr) ... |
gr-qc/0102107 | Adonai S. Sant'Anna | Newton C. A. da Costa and Adonai S. Sant'Anna | The mathematical role of time and space-time in classical physics | LaTeX, 12 pages, no figures. This is a new version | Found.Phys.Lett. 14 (2001) 553-563 | null | null | gr-qc | null | We use Padoa's principle of independence of primitive symbols in axiomatic
systems in order to discuss the mathematical role of time and space-time in
some classical physical theories. We show that time is eliminable in Newtonian
mechanics and that space-time is also dispensable in Hamiltonian mechanics,
Maxwell's el... | [
{
"created": "Tue, 27 Feb 2001 14:47:10 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Apr 2001 12:00:00 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"da Costa",
"Newton C. A.",
""
],
[
"Sant'Anna",
"Adonai S.",
""
]
] | We use Padoa's principle of independence of primitive symbols in axiomatic systems in order to discuss the mathematical role of time and space-time in some classical physical theories. We show that time is eliminable in Newtonian mechanics and that space-time is also dispensable in Hamiltonian mechanics, Maxwell's elec... |
2206.08601 | Mohsen Khodadi | Mohsen Khodadi and Gaetano Lambiase | Probing the Lorentz Symmetry Violation Using the First Image of
Sagittarius A*: Constraints on Standard-Model Extension Coefficients | 16 pages, 5 figures. v3:discussion improved, references added,
figures revised; matches the version accepted for publication in PRD | Phys. Rev. D 106, 104050 (2022) | 10.1103/PhysRevD.106.104050 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thanks to unparalleled near-horizon images of the shadows of Messier 87*
(M87*) and Sagittarius A* (Sgr A*) delivered by the Event Horizon Telescope
(EHT), two amazing windows opened up to us for the strong-field test of the
gravity theories as well as fundamental physics. Information recently published
from EHT abou... | [
{
"created": "Fri, 17 Jun 2022 07:58:06 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jun 2022 10:14:34 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Nov 2022 17:34:02 GMT",
"version": "v3"
}
] | 2022-11-29 | [
[
"Khodadi",
"Mohsen",
""
],
[
"Lambiase",
"Gaetano",
""
]
] | Thanks to unparalleled near-horizon images of the shadows of Messier 87* (M87*) and Sagittarius A* (Sgr A*) delivered by the Event Horizon Telescope (EHT), two amazing windows opened up to us for the strong-field test of the gravity theories as well as fundamental physics. Information recently published from EHT about ... |
gr-qc/0604003 | Salvatore Antoci | S. Antoci, D.-E. Liebscher, L. Mihich | Confinement in Einstein's unified field theory | 17 pages, added comment in Section 6 about Petrov eigenvalue equation | Annales Fond.Broglie.33:221-239,2008 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After recalling the mathematical structure of Einstein's Hermitian extension
of the gravitational theory of 1915, the problem, whether its field equations
should admit of phenomenological sources at their right-hand sides, and how
this addition should be done, is expounded by relying on a thread of essential
insights... | [
{
"created": "Sat, 1 Apr 2006 15:12:46 GMT",
"version": "v1"
},
{
"created": "Wed, 18 Jul 2012 15:28:48 GMT",
"version": "v2"
}
] | 2012-07-19 | [
[
"Antoci",
"S.",
""
],
[
"Liebscher",
"D. -E.",
""
],
[
"Mihich",
"L.",
""
]
] | After recalling the mathematical structure of Einstein's Hermitian extension of the gravitational theory of 1915, the problem, whether its field equations should admit of phenomenological sources at their right-hand sides, and how this addition should be done, is expounded by relying on a thread of essential insights a... |
1107.3468 | Bogus{\l}aw Broda | Bogus{\l}aw Broda | Quantum gravity stability of isotropy in homogeneous cosmology | 9 pages, 1 figure | Phys.Lett.B704:655-658,2011 | 10.1016/j.physletb.2011.09.087 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been shown that anisotropy of homogeneous spacetime described by the
general Kasner metric can be damped by quantum fluctuations coming from
perturbative quantum gravity in one-loop approximation. Also, a formal
argument, not limited to one-loop approximation, is put forward in favor of
stability of isotropy i... | [
{
"created": "Mon, 18 Jul 2011 15:19:11 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jul 2011 13:49:20 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Sep 2011 14:48:25 GMT",
"version": "v3"
},
{
"created": "Fri, 7 Oct 2011 07:52:11 GMT",
"version": "v4"
}
] | 2011-10-11 | [
[
"Broda",
"Bogusław",
""
]
] | It has been shown that anisotropy of homogeneous spacetime described by the general Kasner metric can be damped by quantum fluctuations coming from perturbative quantum gravity in one-loop approximation. Also, a formal argument, not limited to one-loop approximation, is put forward in favor of stability of isotropy in ... |
1303.6229 | P Huang | Peng Huang, Yong-chang Huang | $f(T)$ theories from holographic dark energy models | 15 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconstruct $f(T)$ theories from three different holographic dark energy
models in different time durations. For the HDE model, the dark energy
dominated era with new setting up is chosen for reconstruction, and the
radiation dominated era is chosen when the involved model changes into NADE.
For the RDE model, rad... | [
{
"created": "Mon, 25 Mar 2013 17:50:28 GMT",
"version": "v1"
}
] | 2013-03-26 | [
[
"Huang",
"Peng",
""
],
[
"Huang",
"Yong-chang",
""
]
] | We reconstruct $f(T)$ theories from three different holographic dark energy models in different time durations. For the HDE model, the dark energy dominated era with new setting up is chosen for reconstruction, and the radiation dominated era is chosen when the involved model changes into NADE. For the RDE model, radia... |
1403.1684 | Victor P. Ruban | V. P. Ruban | Ideal hydrodynamics inside as well as outside non-rotating black hole:
Hamiltonian description in the Painlev{\'e}-Gullstrand coordinates | revtex4, 7 pages, no figures | ZhETF 146, 96-104 (2014) [Russian original] | 10.1134/S1063776114070061 | null | gr-qc astro-ph.GA physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is demonstrated that with using Painlev{\'e}-Gullstrand coordinates in
their quasi-Cartesian variant, the Hamiltonian functional for relativistic
perfect fluid hydrodynamics near a non-rotating black hole differs from the
corresponding flat-spacetime Hamiltonian just by a simple term. Moreover, the
internal region... | [
{
"created": "Fri, 7 Mar 2014 08:49:28 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Ruban",
"V. P.",
""
]
] | It is demonstrated that with using Painlev{\'e}-Gullstrand coordinates in their quasi-Cartesian variant, the Hamiltonian functional for relativistic perfect fluid hydrodynamics near a non-rotating black hole differs from the corresponding flat-spacetime Hamiltonian just by a simple term. Moreover, the internal region o... |
2305.04970 | Marco de Cesare | Marco de Cesare and Roberto Oliveri | Backreaction of scalar waves on black holes at low frequencies | 10 pages, 3 figures; v2: updated references, matches published
version in PRD | Phys. Rev. D 108 (2023), 044050 | 10.1103/PhysRevD.108.044050 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the accretion of a Schwarzschild black hole due to spherically
symmetric perturbations sourced by a minimally coupled massless scalar field.
The backreaction of the black hole to low-frequency ingoing scalar waves is
computed analytically as a second-order perturbative effect, using matched
asymptotic expans... | [
{
"created": "Mon, 8 May 2023 18:03:40 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Aug 2023 16:50:02 GMT",
"version": "v2"
}
] | 2023-08-24 | [
[
"de Cesare",
"Marco",
""
],
[
"Oliveri",
"Roberto",
""
]
] | We study the accretion of a Schwarzschild black hole due to spherically symmetric perturbations sourced by a minimally coupled massless scalar field. The backreaction of the black hole to low-frequency ingoing scalar waves is computed analytically as a second-order perturbative effect, using matched asymptotic expansio... |
2311.13264 | Orlando Luongo | Orlando Luongo, Hernando Quevedo, S. N. Sajadi | Gravitational repulsive effects in 3D regular black holes | 12 pages, 5 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider the effects of repulsive gravity in an invariant
way for four static 3D regular black holes, using the eigenvalues of the
Riemann curvature tensor, the Ricci scalar, and the strong energy conditions.
The eigenvalues of the solutions are non-vanishing asymptotically (in
asymptotically AdS) an... | [
{
"created": "Wed, 22 Nov 2023 09:28:15 GMT",
"version": "v1"
}
] | 2023-11-23 | [
[
"Luongo",
"Orlando",
""
],
[
"Quevedo",
"Hernando",
""
],
[
"Sajadi",
"S. N.",
""
]
] | In this work, we consider the effects of repulsive gravity in an invariant way for four static 3D regular black holes, using the eigenvalues of the Riemann curvature tensor, the Ricci scalar, and the strong energy conditions. The eigenvalues of the solutions are non-vanishing asymptotically (in asymptotically AdS) and ... |
gr-qc/0102066 | Spiros Cotsakis | Spiros Cotsakis and Peter Leach | Is Nature Generic? | 17 pages, latex | Lect.Notes Phys. 592 (2002) 3-15 | null | null | gr-qc astro-ph hep-th | null | An introductory guide to mathematical cosmology is given focusing on the
issue of the genericity of various important results which have been obtained
during the last thirty or so years. Some of the unsolved problems along with
certain new and potentially powerful methods which may be used for future
progress are als... | [
{
"created": "Wed, 14 Feb 2001 10:50:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cotsakis",
"Spiros",
""
],
[
"Leach",
"Peter",
""
]
] | An introductory guide to mathematical cosmology is given focusing on the issue of the genericity of various important results which have been obtained during the last thirty or so years. Some of the unsolved problems along with certain new and potentially powerful methods which may be used for future progress are also ... |
2405.08069 | Matt Visser | Francesco Di Filippo (Charles University of Prague), Stefano Liberati
(SISSA, Trieste), Matt Visser (Victoria University of Wellington) | Fully extremal black holes: a black hole graveyard? | Essay awarded the Fifth Prize in the Gravity Research Foundation 2024
Awards; 18 pages. V2: Minor clarifications and re-phrasing | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | While the standard point of view is that the ultimate endpoint of black hole
evolution is determined by Hawking evaporation, there is a growing evidence
that classical and semi-classical instabilities affect both black holes with
inner horizons as well as their ultra-compact counterparts. In this essay we
start from ... | [
{
"created": "Mon, 13 May 2024 18:00:02 GMT",
"version": "v1"
},
{
"created": "Thu, 23 May 2024 23:16:53 GMT",
"version": "v2"
}
] | 2024-05-27 | [
[
"Di Filippo",
"Francesco",
"",
"Charles University of Prague"
],
[
"Liberati",
"Stefano",
"",
"SISSA, Trieste"
],
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
]
] | While the standard point of view is that the ultimate endpoint of black hole evolution is determined by Hawking evaporation, there is a growing evidence that classical and semi-classical instabilities affect both black holes with inner horizons as well as their ultra-compact counterparts. In this essay we start from th... |
2003.05784 | Gabriele Umberto Varieschi | Gabriele U. Varieschi | Newtonian Fractional-Dimension Gravity and MOND | 25 pages, including 4 figures: change of title and other minor
changes after peer review. Final version to be published in Foundations of
Physics, Springer | Found Phys 50, 1608-1644 (2020) | 10.1007/s10701-020-00389-7 | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper introduces a possible alternative model of gravity based on the
theory of fractional-dimension spaces and its applications to Newtonian
gravity. In particular, Gauss's law for gravity as well as other fundamental
classical laws are extended to a $D$-dimensional metric space, where $D$ can be
a non-integer ... | [
{
"created": "Wed, 11 Mar 2020 13:26:19 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Apr 2020 06:27:19 GMT",
"version": "v2"
},
{
"created": "Sun, 16 Aug 2020 19:20:50 GMT",
"version": "v3"
},
{
"created": "Tue, 29 Sep 2020 21:17:40 GMT",
"version": "v4"
}
] | 2021-02-09 | [
[
"Varieschi",
"Gabriele U.",
""
]
] | This paper introduces a possible alternative model of gravity based on the theory of fractional-dimension spaces and its applications to Newtonian gravity. In particular, Gauss's law for gravity as well as other fundamental classical laws are extended to a $D$-dimensional metric space, where $D$ can be a non-integer di... |
gr-qc/9809014 | M. A. Clayton | M. A. Clayton, L. Demopoulos and J. Legare | The dynamical stability of the static real scalar field solutions to the
Einstein-Klein-Gordon equations revisited | 13 pages, uses Elsevier style files. To appear in Phys. Lett. A | Phys.Lett.A248:131-138,1998 | 10.1016/S0375-9601(98)00646-X | CERN-TH/98-93, UTPT-98-04 | gr-qc | null | We re-examine the dynamical stability of the nakedly singular, static,
spherical ly symmetric solutions of the Einstein-Klein Gordon system. We
correct an earlier proof of the instability of these solutions, and demonstrate
that there are solutions to the massive Klein-Gordon system that are
perturbatively stable.
| [
{
"created": "Wed, 2 Sep 1998 20:35:20 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Clayton",
"M. A.",
""
],
[
"Demopoulos",
"L.",
""
],
[
"Legare",
"J.",
""
]
] | We re-examine the dynamical stability of the nakedly singular, static, spherical ly symmetric solutions of the Einstein-Klein Gordon system. We correct an earlier proof of the instability of these solutions, and demonstrate that there are solutions to the massive Klein-Gordon system that are perturbatively stable. |
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