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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0512094 | Eugen Radu | Eugen Radu | On rotating solitons in general relativity | 11 pages, 3 figures; work presented at International Conference on
Fundamental and Applied Research in Physics, 26-29 October 2005, Iasi,
Romania | null | null | null | gr-qc hep-th | null | We review a number of results recently obtained in the area of constructing
rotating solitons in a four dimensional asymptotically flat spacetime. Various
models are examined, special attention being paid to the monopole-antimonopole
and gauged skyrmion configurations, which have a nonvanishing total angular
momentum... | [
{
"created": "Thu, 15 Dec 2005 17:25:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Radu",
"Eugen",
""
]
] | We review a number of results recently obtained in the area of constructing rotating solitons in a four dimensional asymptotically flat spacetime. Various models are examined, special attention being paid to the monopole-antimonopole and gauged skyrmion configurations, which have a nonvanishing total angular momentum. ... |
1302.6566 | Andreas Kreienbuehl | Andreas Kreienbuehl and Tomasz Pawlowski | Singularity resolution from polymer quantum matter | 13 pages and 4 figures | Phys. Rev. D 88 (2013) 043504 | 10.1103/PhysRevD.88.043504 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the polymeric nature of quantum matter fields using the example of a
Friedmann-Lemaitre-Robertson-Walker universe sourced by a minimally coupled
massless scalar field. The model is treated in the symmetry reduced regime via
deparametrization techniques, with the scale factor playing the role of time.
Subsequ... | [
{
"created": "Tue, 26 Feb 2013 20:26:08 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Aug 2013 18:53:49 GMT",
"version": "v2"
}
] | 2015-09-16 | [
[
"Kreienbuehl",
"Andreas",
""
],
[
"Pawlowski",
"Tomasz",
""
]
] | We study the polymeric nature of quantum matter fields using the example of a Friedmann-Lemaitre-Robertson-Walker universe sourced by a minimally coupled massless scalar field. The model is treated in the symmetry reduced regime via deparametrization techniques, with the scale factor playing the role of time. Subsequen... |
1004.2394 | Ralf Schutzhold | Ralf Sch\"utzhold | Recreating Fundamental Effects in the Laboratory? | 15 pages, 4 figures | Adv.Sci.Lett.2:121,2009 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article provides a brief (non-exhaustive) overview of some possibilities
for recreating fundamental effects which are relevant for black holes (and
other gravitational scenarios) in the laboratory. Via suitable condensed matter
analogues and other laboratory systems, it might be possible to model the
Penrose pro... | [
{
"created": "Wed, 14 Apr 2010 13:41:51 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Schützhold",
"Ralf",
""
]
] | This article provides a brief (non-exhaustive) overview of some possibilities for recreating fundamental effects which are relevant for black holes (and other gravitational scenarios) in the laboratory. Via suitable condensed matter analogues and other laboratory systems, it might be possible to model the Penrose proce... |
1809.05163 | Clifford M. Will | Alexandria Tucker and Clifford M. Will | Pericenter advance in general relativity: Comparison of approaches at
high post-Newtonian orders | 10 pages, version aligned with published paper | Classical and Quantum Gravity 36, 115001 (2019) | 10.1088/1361-6382/ab1c53 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The advance of the pericenter of the orbit of a test body around a massive
body in general relativity can be calculated in a number of ways. In one
method, one studies the geodesic equation in the exact Schwarzschild geometry
and finds the angle between pericenters as an integral of a certain radial
function between ... | [
{
"created": "Thu, 13 Sep 2018 20:20:34 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Oct 2019 09:34:37 GMT",
"version": "v2"
}
] | 2019-10-14 | [
[
"Tucker",
"Alexandria",
""
],
[
"Will",
"Clifford M.",
""
]
] | The advance of the pericenter of the orbit of a test body around a massive body in general relativity can be calculated in a number of ways. In one method, one studies the geodesic equation in the exact Schwarzschild geometry and finds the angle between pericenters as an integral of a certain radial function between tu... |
gr-qc/9701002 | T. P. Singh | T. P. Singh and Louis Witten | Cosmic censorship and spherical gravitational collapse with tangential
pressure | 16 pages, Latex file, two figures, uses epsf.sty | Class.Quant.Grav. 14 (1997) 3489-3499 | 10.1088/0264-9381/14/12/029 | null | gr-qc | null | We study the spherical gravitational collapse of a compact object under the
approximation that the radial pressure is identically zero, and the tangential
pressure is related to the density by a linear equation of state. It turns out
that the Einstein equations can be reduced to the solution of an integral for
the ev... | [
{
"created": "Wed, 1 Jan 1997 10:51:29 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Singh",
"T. P.",
""
],
[
"Witten",
"Louis",
""
]
] | We study the spherical gravitational collapse of a compact object under the approximation that the radial pressure is identically zero, and the tangential pressure is related to the density by a linear equation of state. It turns out that the Einstein equations can be reduced to the solution of an integral for the evol... |
1709.02299 | Peter Horvathy | P.-M. Zhang, C. Duval, P. A. Horvathy | Memory Effect for Impulsive Gravitational Waves | Updated version which matches the one to appear in Class. Quant.
Grav. 28 pages, 7 figures | null | 10.1088/1361-6382/aaa987 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Impulsive gravitational plane waves, which have a delta-function singularity
on a hypersurface, can be obtained by squeezing smooth plane gravitational
waves with Gaussian profile. They exhibit (as do their smooth counterparts) the
Velocity Memory Effect: after the wave has passed, particles initially at rest
move ap... | [
{
"created": "Thu, 7 Sep 2017 15:09:42 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Sep 2017 13:58:30 GMT",
"version": "v2"
},
{
"created": "Tue, 23 Jan 2018 18:13:58 GMT",
"version": "v3"
}
] | 2018-03-14 | [
[
"Zhang",
"P. -M.",
""
],
[
"Duval",
"C.",
""
],
[
"Horvathy",
"P. A.",
""
]
] | Impulsive gravitational plane waves, which have a delta-function singularity on a hypersurface, can be obtained by squeezing smooth plane gravitational waves with Gaussian profile. They exhibit (as do their smooth counterparts) the Velocity Memory Effect: after the wave has passed, particles initially at rest move apar... |
1109.1535 | David Garfinkle | David Garfinkle and E.N. Glass | Bertotti-Robinson and Melvin Spacetimes | null | Class. Quantum Grav. vol 28, 215012 (2011) | 10.1088/0264-9381/28/21/215012 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Similarities between the Melvin and Bertotti-Robinson spacetimes are
discussed and a uniqueness conjecture is formulated.
| [
{
"created": "Wed, 7 Sep 2011 18:54:38 GMT",
"version": "v1"
}
] | 2015-05-30 | [
[
"Garfinkle",
"David",
""
],
[
"Glass",
"E. N.",
""
]
] | Similarities between the Melvin and Bertotti-Robinson spacetimes are discussed and a uniqueness conjecture is formulated. |
1902.03686 | J Erik Baxter | J. Erik Baxter | Stable furry black holes in $\mathfrak{su}(\infty)$ anti-de Sitter
Einstein-Yang-Mills theory, characterised by an infinitude of global charges | 10 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present solutions to classical field equations for purely magnetic
$\mathfrak{su}(\infty)$ Einstein-Yang-Mills theory in asymptotically Anti-de
Sitter space. These solutions are found to be stable under linear,
time-dependent perturbations. Recent work has also shown that these solutions
may in general be uniquely... | [
{
"created": "Sun, 10 Feb 2019 23:58:58 GMT",
"version": "v1"
}
] | 2019-02-12 | [
[
"Baxter",
"J. Erik",
""
]
] | We present solutions to classical field equations for purely magnetic $\mathfrak{su}(\infty)$ Einstein-Yang-Mills theory in asymptotically Anti-de Sitter space. These solutions are found to be stable under linear, time-dependent perturbations. Recent work has also shown that these solutions may in general be uniquely c... |
2003.10862 | Alexander Kamenshchik | A. Yu. Kamenshchik, A. Tronconi and G. Venturi | Generalized unimodular gravity in Friedmann and Kantowski-Sachs
universes | 6 pages, to be published in Journal of Experimental and Theoretical
Physics Letters | null | 10.1134/S0021364020080032 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We illustrate the recently proposed generalized unimodular gravity using
simple examples of the Friedmann, Kantowski-Sachs and Schwarzschild geometries
and show that it can be further generalized and reveal some unexpected and
interesting effects.
| [
{
"created": "Tue, 24 Mar 2020 14:10:12 GMT",
"version": "v1"
}
] | 2020-05-20 | [
[
"Kamenshchik",
"A. Yu.",
""
],
[
"Tronconi",
"A.",
""
],
[
"Venturi",
"G.",
""
]
] | We illustrate the recently proposed generalized unimodular gravity using simple examples of the Friedmann, Kantowski-Sachs and Schwarzschild geometries and show that it can be further generalized and reveal some unexpected and interesting effects. |
2405.18798 | Mohammad Ali S. Afshar | Jafar Sadeghi, Mohammad Ali S. Afshar | Effective Potential and Topological Photon Spheres: A Novel Approach to
Black Hole Parameter Classification | 38 pages, 16 figures, 7 Tables | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this article, we anchor our analysis on the premise that the presence of a
photon sphere is an intrinsic characteristic of any ultra-compact gravitational
structure with spherical symmetry. Utilizing the concept of a topological
photon sphere, we categorize the behaviors of diverse gravitational models
based on th... | [
{
"created": "Wed, 29 May 2024 06:33:29 GMT",
"version": "v1"
}
] | 2024-05-30 | [
[
"Sadeghi",
"Jafar",
""
],
[
"Afshar",
"Mohammad Ali S.",
""
]
] | In this article, we anchor our analysis on the premise that the presence of a photon sphere is an intrinsic characteristic of any ultra-compact gravitational structure with spherical symmetry. Utilizing the concept of a topological photon sphere, we categorize the behaviors of diverse gravitational models based on the ... |
gr-qc/0606046 | Kourosh Nozari | Kourosh Nozari and A. S. Sefiedgar | On the Existence of the Logarithmic Correction Term in Black Hole
Entropy-Area Relation | 9 Pages, No Figures | Gen.Rel.Grav.39:501-509,2007 | 10.1007/s10714-007-0397-3 | null | gr-qc | null | In this paper we consider a model universe with large extra dimensions to
obtain a modified black hole entropy-area relation. We use the generalized
uncertainty principle to find a relation between the number of spacetime
dimensions and the presence or vanishing of logarithmic prefactor in the black
hole entropy-area... | [
{
"created": "Sun, 11 Jun 2006 09:03:25 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nozari",
"Kourosh",
""
],
[
"Sefiedgar",
"A. S.",
""
]
] | In this paper we consider a model universe with large extra dimensions to obtain a modified black hole entropy-area relation. We use the generalized uncertainty principle to find a relation between the number of spacetime dimensions and the presence or vanishing of logarithmic prefactor in the black hole entropy-area r... |
gr-qc/0410020 | Roberto Aloisio | R. Aloisio, A. Galante, A.F. Grillo, E. Luzio and F. Mendez | Approaching Space Time Through Velocity in Doubly Special Relativity | 11 pages, no figures, minor changes, references added, final version
to appear in PRD | Phys.Rev. D70 (2004) 125012 | 10.1103/PhysRevD.70.125012 | null | gr-qc hep-th | null | We discuss the definition of velocity as dE/dp, where E,p are the energy and
momentum of a particle, in Doubly Special Relativity (DSR). If this definition
matches dx/dt appropriate for the space-time sector, then space-time can in
principle be built consistently with the existence of an invariant length
scale. We sh... | [
{
"created": "Tue, 5 Oct 2004 12:30:55 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Oct 2004 15:07:28 GMT",
"version": "v2"
},
{
"created": "Fri, 3 Dec 2004 18:30:15 GMT",
"version": "v3"
}
] | 2009-11-10 | [
[
"Aloisio",
"R.",
""
],
[
"Galante",
"A.",
""
],
[
"Grillo",
"A. F.",
""
],
[
"Luzio",
"E.",
""
],
[
"Mendez",
"F.",
""
]
] | We discuss the definition of velocity as dE/dp, where E,p are the energy and momentum of a particle, in Doubly Special Relativity (DSR). If this definition matches dx/dt appropriate for the space-time sector, then space-time can in principle be built consistently with the existence of an invariant length scale. We show... |
0802.1249 | Guillaume Faye | Luc Blanchet, Guillaume Faye, Bala R. Iyer, Siddhartha Sinha | The third post-Newtonian gravitational wave polarisations and associated
spherical harmonic modes for inspiralling compact binaries in quasi-circular
orbits | includes corrections to be published in an erratum; the changes are:
in Eq (5.15b), -484/105 -> -188/35; in Eq (8.9g), 81127/10080 -> 1369/160; Eq
(8.10g), -48239/5040 -> -2419/240; Eq (9.4b), -995/84 -> -353/28 | Class.Quant.Grav.25:165003,2008 | 10.1088/0264-9381/25/16/165003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational waveform (GWF) generated by inspiralling compact binaries
moving in quasi-circular orbits is computed at the third post-Newtonian (3PN)
approximation to general relativity. Our motivation is two-fold: (i) To provide
accurate templates for the data analysis of gravitational wave inspiral signals
in l... | [
{
"created": "Sat, 9 Feb 2008 07:12:40 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Aug 2008 12:03:34 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Oct 2012 17:44:28 GMT",
"version": "v3"
}
] | 2012-10-22 | [
[
"Blanchet",
"Luc",
""
],
[
"Faye",
"Guillaume",
""
],
[
"Iyer",
"Bala R.",
""
],
[
"Sinha",
"Siddhartha",
""
]
] | The gravitational waveform (GWF) generated by inspiralling compact binaries moving in quasi-circular orbits is computed at the third post-Newtonian (3PN) approximation to general relativity. Our motivation is two-fold: (i) To provide accurate templates for the data analysis of gravitational wave inspiral signals in las... |
1302.1866 | Manuel Rodrigues | F. G. Alvarenga, A. de la Cruz-Dombriz, M. J. S. Houndjo, M. E.
Rodrigues and D. S\'aez-G\'omez | Dynamics of scalar perturbations in f(R,T) gravity | 11 pages, 3 figures, revtex4 format, minor changes to match version
as published version, published version in PRD | Phys. Rev. D 87, 103526 (2013) | 10.1103/PhysRevD.87.103526 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of f(R,T) theories of gravity, we study the evolution of
scalar cosmological perturbations in the metric formalism. According to
restrictions on the background evolution, a specific model within these
theories is assumed in order to guarantee the standard continuity equation.
Using a completely general... | [
{
"created": "Thu, 7 Feb 2013 18:20:52 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jun 2013 00:01:42 GMT",
"version": "v2"
}
] | 2013-06-20 | [
[
"Alvarenga",
"F. G.",
""
],
[
"de la Cruz-Dombriz",
"A.",
""
],
[
"Houndjo",
"M. J. S.",
""
],
[
"Rodrigues",
"M. E.",
""
],
[
"Sáez-Gómez",
"D.",
""
]
] | In the context of f(R,T) theories of gravity, we study the evolution of scalar cosmological perturbations in the metric formalism. According to restrictions on the background evolution, a specific model within these theories is assumed in order to guarantee the standard continuity equation. Using a completely general p... |
1302.1972 | Diego Pavon | Jos\'e Pedro Mimoso and Diego Pav\'on | Entropy evolution of universes with initial and final de Sitter eras | 12 pages, no figures. Key words: Early and late universe,
thermodynamics. This version matches the published one in Phys. Rev. D | Physical Review D 87, 047302 (2013) | 10.1103/PhysRevD.87.047302 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This brief report studies the behavior of entropy in two recent models of
cosmic evolution by J.A.S. Lima, S. Basilakos, and F.E.M. Costa [Phys. Rev. D
\underline{86}, 103534 (2012)], and J. A. S. Lima, S. Basilakos, and J.
Sol\'{a} [arXiv:1209.2802]. Both start with an initial de Sitter expansion, go
through the con... | [
{
"created": "Fri, 8 Feb 2013 09:14:24 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Feb 2013 12:35:19 GMT",
"version": "v2"
}
] | 2013-02-28 | [
[
"Mimoso",
"José Pedro",
""
],
[
"Pavón",
"Diego",
""
]
] | This brief report studies the behavior of entropy in two recent models of cosmic evolution by J.A.S. Lima, S. Basilakos, and F.E.M. Costa [Phys. Rev. D \underline{86}, 103534 (2012)], and J. A. S. Lima, S. Basilakos, and J. Sol\'{a} [arXiv:1209.2802]. Both start with an initial de Sitter expansion, go through the conve... |
1511.04269 | Giampiero Esposito Dr. | Enrico Calloni, S. Caprara, Martina De Laurentis, Giampiero Esposito,
M. Grilli, E. Majorana, G. P. Pepe, S. Petrarca, Paola Puppo, P. Rapagnani,
Fulvio Ricci, Luigi Rosa, Carlo Rovelli, P. Ruggi, N. L. Saini, Cosimo
Stornaiolo, Francesco Tafuri | Archimedes: a feasibility study of an experiment to weigh the
electromagnetic vacuum | 3 pages, MG14 Conference | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Archimedes is a feasibility study of a future experiment to ascertain the
interaction of vacuum fluctuations with gravity. The experiment should measure
the force that the earth's gravitational field exerts on a Casimir cavity by
using a small force detector. Here we analyse the main parameters of the
experiment and ... | [
{
"created": "Fri, 13 Nov 2015 12:59:17 GMT",
"version": "v1"
}
] | 2015-11-16 | [
[
"Calloni",
"Enrico",
""
],
[
"Caprara",
"S.",
""
],
[
"De Laurentis",
"Martina",
""
],
[
"Esposito",
"Giampiero",
""
],
[
"Grilli",
"M.",
""
],
[
"Majorana",
"E.",
""
],
[
"Pepe",
"G. P.",
""
],
[
"... | Archimedes is a feasibility study of a future experiment to ascertain the interaction of vacuum fluctuations with gravity. The experiment should measure the force that the earth's gravitational field exerts on a Casimir cavity by using a small force detector. Here we analyse the main parameters of the experiment and we... |
gr-qc/0703072 | Chopin Soo | Chung-Hsien Chou, Chopin Soo and Hoi-Lai Yu | Black holes and Rindler superspace: classical singularity and quantum
unitarity | 6 pages, LaTeX file; expanded remarks section in v2 | Phys.Rev.D76:084004,2007 | 10.1103/PhysRevD.76.084004 | null | gr-qc | null | Canonical quantization of spherically symmetric initial data which is
appropriate to classical interior black hole solutions in four dimensions is
carried out and solved exactly without gauge fixing the remaining kinematic
Gauss Law constraint. The resultant mini-superspace manifold and arena for
quantum geometrodyna... | [
{
"created": "Tue, 13 Mar 2007 11:24:36 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Aug 2007 07:18:01 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chou",
"Chung-Hsien",
""
],
[
"Soo",
"Chopin",
""
],
[
"Yu",
"Hoi-Lai",
""
]
] | Canonical quantization of spherically symmetric initial data which is appropriate to classical interior black hole solutions in four dimensions is carried out and solved exactly without gauge fixing the remaining kinematic Gauss Law constraint. The resultant mini-superspace manifold and arena for quantum geometrodynami... |
1604.04175 | Raissa Mendes | Raissa F. P. Mendes and N\'estor Ortiz | Highly compact neutron stars in scalar-tensor theories of gravity:
Spontaneous scalarization versus gravitational collapse | 17 pages, 12 figures; v2: new panels added to some figures,
references added, improved discussion | Phys. Rev. D 93, 124035 (2016) | 10.1103/PhysRevD.93.124035 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar-tensor theories of gravity are extensions of General Relativity (GR)
including an extra, nonminimally coupled scalar degree of freedom. A wide class
of these theories, albeit indistinguishable from GR in the weak field regime,
predicts a radically different phenomenology for neutron stars, due to a
nonperturba... | [
{
"created": "Thu, 14 Apr 2016 14:51:37 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jun 2016 13:20:32 GMT",
"version": "v2"
}
] | 2016-06-23 | [
[
"Mendes",
"Raissa F. P.",
""
],
[
"Ortiz",
"Néstor",
""
]
] | Scalar-tensor theories of gravity are extensions of General Relativity (GR) including an extra, nonminimally coupled scalar degree of freedom. A wide class of these theories, albeit indistinguishable from GR in the weak field regime, predicts a radically different phenomenology for neutron stars, due to a nonperturbati... |
2003.07732 | Mu-Tao Wang | Mu-Tao Wang | Total mass and limits of quasi-local mass at future null infinity | Proceedings of 2018 ICCM at NTU | null | null | null | gr-qc math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An idealized observer of an astronomical event is situated at future null
infinity, where light rays emitted from the source approach. Mathematically,
null infinity corresponds to the portion of the spacetime boundary defined by
equivalence classes of null geodesics. But what can we observe at future null
infinity? I... | [
{
"created": "Tue, 17 Mar 2020 14:08:17 GMT",
"version": "v1"
}
] | 2020-03-18 | [
[
"Wang",
"Mu-Tao",
""
]
] | An idealized observer of an astronomical event is situated at future null infinity, where light rays emitted from the source approach. Mathematically, null infinity corresponds to the portion of the spacetime boundary defined by equivalence classes of null geodesics. But what can we observe at future null infinity? In ... |
1712.03677 | Jibril Ben Achour | Jibril Ben Achour and Suddhasattwa Brahma | Covariance in self dual inhomogeneous models of effective quantum
geometry: Spherical symmetry and Gowdy systems | 24 pages, references added | Phys. Rev. D 97, 126003 (2018) | 10.1103/PhysRevD.97.126003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When applying the techniques of Loop Quantum Gravity (LQG) to
symmetry-reduced gravitational systems, one first regularizes the scalar
constraint using holonomy corrections, prior to quantization. In inhomogeneous
system, where a residual spatial diffeomorphism symmetry survives, such
modification of the gauge genera... | [
{
"created": "Mon, 11 Dec 2017 08:50:49 GMT",
"version": "v1"
},
{
"created": "Wed, 2 May 2018 05:07:46 GMT",
"version": "v2"
},
{
"created": "Tue, 15 May 2018 10:35:47 GMT",
"version": "v3"
}
] | 2018-06-20 | [
[
"Achour",
"Jibril Ben",
""
],
[
"Brahma",
"Suddhasattwa",
""
]
] | When applying the techniques of Loop Quantum Gravity (LQG) to symmetry-reduced gravitational systems, one first regularizes the scalar constraint using holonomy corrections, prior to quantization. In inhomogeneous system, where a residual spatial diffeomorphism symmetry survives, such modification of the gauge generato... |
2308.03632 | Francesco Bajardi | Francesco Bajardi, Daniel Blixt, Salvatore Capozziello | The Gauss-Bonnet topological scalar in the Geometric Trinity of Gravity | 18 pages; Accepted for publication in IJGMMP | null | 10.1142/S0219887824500427 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Gauss-Bonnet topological scalar is presented in metric-teleparallel
formalism as well as in the symmetric and general teleparallel formulations. In
all of the aforementioned frameworks, the full expressions are provided
explicitly in terms of torsion, non-metricity and Levi-Civita covariant
derivative. The number... | [
{
"created": "Mon, 7 Aug 2023 14:38:58 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Aug 2023 09:10:09 GMT",
"version": "v2"
}
] | 2023-09-18 | [
[
"Bajardi",
"Francesco",
""
],
[
"Blixt",
"Daniel",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | The Gauss-Bonnet topological scalar is presented in metric-teleparallel formalism as well as in the symmetric and general teleparallel formulations. In all of the aforementioned frameworks, the full expressions are provided explicitly in terms of torsion, non-metricity and Levi-Civita covariant derivative. The number o... |
gr-qc/9410034 | David Hochberg | David Hochberg | Free Energy and Entropy for Semi-classical Black Holes in the Canonical
Ensemble | 25 pages, not including 10 Figures available upon request from the
author: LAEFF-94/08. Typed in LaTex | Phys.Rev.D51:5742-5752,1995 | 10.1103/PhysRevD.51.5742 | null | gr-qc | null | We consider the thermodynamics of a black hole coupled to thermal radiation
in a spatially finite (spherical) region. Thermodynamic state functions are
derived in the canonical ensemble, defined by elements of radius $r_o$ and
boundary temperature $T(r_o)$. Using recent solutions of the semi-classical
back reaction p... | [
{
"created": "Mon, 24 Oct 1994 15:47:29 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Hochberg",
"David",
""
]
] | We consider the thermodynamics of a black hole coupled to thermal radiation in a spatially finite (spherical) region. Thermodynamic state functions are derived in the canonical ensemble, defined by elements of radius $r_o$ and boundary temperature $T(r_o)$. Using recent solutions of the semi-classical back reaction pro... |
1304.6737 | Jan Weenink | Tomislav Prokopec, Jan Weenink | Frame independent cosmological perturbations | 29 pages | null | 10.1088/1475-7516/2013/09/027 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the third order gauge invariant action for scalar-graviton
interactions in the Jordan frame. We demonstrate that the gauge invariant
action for scalar and tensor perturbations on one physical hypersurface only
differs from that on another physical hypersurface via terms proportional to
the equation of moti... | [
{
"created": "Wed, 24 Apr 2013 20:17:55 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Prokopec",
"Tomislav",
""
],
[
"Weenink",
"Jan",
""
]
] | We compute the third order gauge invariant action for scalar-graviton interactions in the Jordan frame. We demonstrate that the gauge invariant action for scalar and tensor perturbations on one physical hypersurface only differs from that on another physical hypersurface via terms proportional to the equation of motion... |
2407.17747 | S. M. M. Rasouli | S. M. M. Rasouli, S. Cheraghchi and P. V. Moniz | Fractional Scalar Field Cosmology | 15 pages | Fractal Fract. 2024, 8, 281 | 10.3390/fractalfract8050281 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Considering the Friedmann--Lema\^{i}tre--Robertson--Walker (FLRW) metric and
the Einstein scalar field system as an underlying gravitational model to
construct fractional cosmological models has interesting implications in both
classical and quantum regimes. Regarding the former, we just review the most
fundamental a... | [
{
"created": "Thu, 25 Jul 2024 03:45:41 GMT",
"version": "v1"
}
] | 2024-07-26 | [
[
"Rasouli",
"S. M. M.",
""
],
[
"Cheraghchi",
"S.",
""
],
[
"Moniz",
"P. V.",
""
]
] | Considering the Friedmann--Lema\^{i}tre--Robertson--Walker (FLRW) metric and the Einstein scalar field system as an underlying gravitational model to construct fractional cosmological models has interesting implications in both classical and quantum regimes. Regarding the former, we just review the most fundamental app... |
0706.0992 | Eugen Radu | Eugen Radu and Mihai Visinescu | A note on Klein-Gordon equation in a generalized Kaluza-Klein monopole
background | 11 pages, 2 figures; v2: minor corrections, to appear in MPLA | Mod.Phys.Lett.A22:1621-1634,2007 | 10.1142/S0217732307024127 | null | gr-qc | null | We investigate solutions of the Klein-Gordon equation in a class of five
dimensional geometries presenting the same symmetries and asymptotic structure
as the Gross-Perry-Sorkin monopole solution. Apart from globally regular
metrics, we consider also squashed Kaluza-Klein black holes backgrounds.
| [
{
"created": "Thu, 7 Jun 2007 12:23:45 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jun 2007 15:00:59 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Radu",
"Eugen",
""
],
[
"Visinescu",
"Mihai",
""
]
] | We investigate solutions of the Klein-Gordon equation in a class of five dimensional geometries presenting the same symmetries and asymptotic structure as the Gross-Perry-Sorkin monopole solution. Apart from globally regular metrics, we consider also squashed Kaluza-Klein black holes backgrounds. |
gr-qc/9810018 | Max Chaves | M. Chaves and G. Padilla | A Charged Inflaton leaves Behind a Fractal Primeval Structure of
Electromagnetic Fields | 7 pages, no figures | null | null | null | gr-qc | null | The inflaton field is assumed to possess electric charge. The effect of the
charge upon inflation is studied using a parameter \omega_0 that acts as a
measure of the quantity of inflaton present. It is shown that at the end of
inflation the charged inflaton should produce a fractal electromagnetic
structure, which co... | [
{
"created": "Mon, 5 Oct 1998 21:26:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Chaves",
"M.",
""
],
[
"Padilla",
"G.",
""
]
] | The inflaton field is assumed to possess electric charge. The effect of the charge upon inflation is studied using a parameter \omega_0 that acts as a measure of the quantity of inflaton present. It is shown that at the end of inflation the charged inflaton should produce a fractal electromagnetic structure, which coul... |
2007.06691 | Taimur Mohammadi | Taimur Mohammadi, Behrooz Malekolkalami | The Power Spectrum Of Primordial Gravitational Waves Generated by
Anisotropic Metric | 8 pages, 3 figure. arXiv admin note: substantial text overlap with
arXiv:1912.12474 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the predictions from simple inflation models is stochastic background
of gravitational waves (or literally what is called the Primordial
Gravitational Waves (\textbf{PGW})) with a nearly scale-invariant spectrum. To
discuss a possible direct detection of PGW, the quantity so-called Spectral
Energy Density (\te... | [
{
"created": "Mon, 13 Jul 2020 21:06:23 GMT",
"version": "v1"
},
{
"created": "Sun, 13 Sep 2020 19:27:15 GMT",
"version": "v2"
},
{
"created": "Sun, 18 Jul 2021 14:53:18 GMT",
"version": "v3"
},
{
"created": "Wed, 17 Nov 2021 17:30:51 GMT",
"version": "v4"
},
{
"c... | 2022-07-15 | [
[
"Mohammadi",
"Taimur",
""
],
[
"Malekolkalami",
"Behrooz",
""
]
] | One of the predictions from simple inflation models is stochastic background of gravitational waves (or literally what is called the Primordial Gravitational Waves (\textbf{PGW})) with a nearly scale-invariant spectrum. To discuss a possible direct detection of PGW, the quantity so-called Spectral Energy Density (\text... |
gr-qc/0302009 | Rafael D. Sorkin | Djamel Dou (University Center of Eloued), Rafael D. Sorkin (Syracuse
University) | Black Hole Entropy as Causal Links | Latex, 20 pages, 4 postscript figures, to appear in a special issue
of {\it Foundations of Physics} in honor of Jacob Bekenstein, ``Thirty years
of black hole physics'', edited by L. Horwitz | Found.Phys. 33 (2003) 279-296 | 10.1023/A:1023781022519 | SU-GP-2002/12-1 | gr-qc hep-th | null | We model a black hole spacetime as a causal set and count, with a certain
definition, the number of causal links crossing the horizon in proximity to a
spacelike or null hypersurface $\Sigma$. We find that this number is
proportional to the horizon's area on $\Sigma $, thus supporting the
interpretation of the links ... | [
{
"created": "Mon, 3 Feb 2003 22:11:25 GMT",
"version": "v1"
}
] | 2022-10-12 | [
[
"Dou",
"Djamel",
"",
"University Center of Eloued"
],
[
"Sorkin",
"Rafael D.",
"",
"Syracuse\n University"
]
] | We model a black hole spacetime as a causal set and count, with a certain definition, the number of causal links crossing the horizon in proximity to a spacelike or null hypersurface $\Sigma$. We find that this number is proportional to the horizon's area on $\Sigma $, thus supporting the interpretation of the links as... |
gr-qc/0508009 | Wu Ning | Ning Wu, Dahua Zhang | Classical Solution of Field Equation of Gravitational Gauge Field and
Classical Tests of Gauge Theory of Gravity | 33 pages, no figure | null | null | null | gr-qc | null | A systematic method is developed to study classical motion of a mass point in
gravitational gauge field. First, the formulation of gauge theory of gravity in
arbitrary curvilinear coordinates is given. Then in spherical coordinates
system, a spherical symmetric solution of the field equation of gravitational
gauge fi... | [
{
"created": "Mon, 1 Aug 2005 15:47:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wu",
"Ning",
""
],
[
"Zhang",
"Dahua",
""
]
] | A systematic method is developed to study classical motion of a mass point in gravitational gauge field. First, the formulation of gauge theory of gravity in arbitrary curvilinear coordinates is given. Then in spherical coordinates system, a spherical symmetric solution of the field equation of gravitational gauge fiel... |
1508.04060 | Sumanta Chakraborty | Sumanta Chakraborty and T. Padmanabhan | Thermodynamical interpretation of the geometrical variables associated
with null surfaces | v2, Published version | Phys. Rev. D 92, 104011 (2015) | 10.1103/PhysRevD.92.104011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The emergent gravity paradigm interprets gravitational field equations as
describing the thermodynamic limit of the underlying statistical mechanics of
microscopic degrees of freedom of the spacetime. The connection is established
by attributing a heat density Ts to the null surfaces where T is the
appropriate Davies... | [
{
"created": "Thu, 13 Aug 2015 20:05:43 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Nov 2015 00:05:57 GMT",
"version": "v2"
}
] | 2015-11-09 | [
[
"Chakraborty",
"Sumanta",
""
],
[
"Padmanabhan",
"T.",
""
]
] | The emergent gravity paradigm interprets gravitational field equations as describing the thermodynamic limit of the underlying statistical mechanics of microscopic degrees of freedom of the spacetime. The connection is established by attributing a heat density Ts to the null surfaces where T is the appropriate Davies-U... |
gr-qc/0503087 | Edward Glass | J. P. Krisch and E. N. Glass | Energy Transport in the Vaidya System | J.Math. Phys. (to appear) | J.Math.Phys. 46 (2005) 062501 | 10.1063/1.1915290 | null | gr-qc | null | Energy transport mechanisms can be generated by imposing relations between
null tetrad Ricci components. Several kinds of mass and density transport
generated by these relations are studied for the generalized Vaidya system.
| [
{
"created": "Mon, 21 Mar 2005 04:57:20 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Krisch",
"J. P.",
""
],
[
"Glass",
"E. N.",
""
]
] | Energy transport mechanisms can be generated by imposing relations between null tetrad Ricci components. Several kinds of mass and density transport generated by these relations are studied for the generalized Vaidya system. |
2204.09693 | Marcello Miranda | Marcello Miranda, Daniele Vernieri, Salvatore Capozziello, Valerio
Faraoni | Generalized McVittie geometry in Horndeski gravity with matter | 13 pages | Phys. Rev. D 105, no.12, 124024 (2022) | 10.1103/PhysRevD.105.124024 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate McVittie and generalized McVittie solutions for Horndeski
gravity with a spatially homogeneous gravitational scalar field, which is
stealth at small scales near the central object but, at large scales, sources
the FLRW universe in which the central inhomogeneity is embedded. Unlike
previous studies, we... | [
{
"created": "Wed, 20 Apr 2022 18:00:02 GMT",
"version": "v1"
}
] | 2022-06-15 | [
[
"Miranda",
"Marcello",
""
],
[
"Vernieri",
"Daniele",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"Faraoni",
"Valerio",
""
]
] | We investigate McVittie and generalized McVittie solutions for Horndeski gravity with a spatially homogeneous gravitational scalar field, which is stealth at small scales near the central object but, at large scales, sources the FLRW universe in which the central inhomogeneity is embedded. Unlike previous studies, we i... |
1502.01060 | Iv\'an E. S\'anchez G. | Iv\'an E. S\'anchez G. and Osvaldo P. Santill\'an | Power spectra in extended tachyon cosmologies | 7 pages, 7 figures, accepted for publication in General Relativity
and Gravitation | null | 10.1007/s10714-015-1956-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present work the power spectrum of a particular class of tachyon
fields is compared with the one corresponding to a cosmological constant model.
This is done for different barotropic indexes $\gamma_0$ and the background
space time is assumed to be of the spatially flat Friedmann-Robertson-Walker
type. The dif... | [
{
"created": "Tue, 3 Feb 2015 22:55:58 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Sep 2015 15:10:47 GMT",
"version": "v2"
}
] | 2015-09-09 | [
[
"G.",
"Iván E. Sánchez",
""
],
[
"Santillán",
"Osvaldo P.",
""
]
] | In the present work the power spectrum of a particular class of tachyon fields is compared with the one corresponding to a cosmological constant model. This is done for different barotropic indexes $\gamma_0$ and the background space time is assumed to be of the spatially flat Friedmann-Robertson-Walker type. The diffe... |
2008.12931 | Carlos Palenzuela | Carlos Palenzuela | Introduction to Numerical Relativity | Accepted by Frontiers Astronomy and Space Sciences, invited review
for the Research Topic "Gravitational Waves: A New Window to the Universe" | null | 10.3389/fspas.2020.00058 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerical Relativity is a multidisciplinary field including relativity,
magneto-hydrodynamics, astrophysics and computational methods, among others,
with the aim of solving numerically highly-dynamical, strong-gravity scenarios
where no other approximations are available. Here we describe some of the
foundations of t... | [
{
"created": "Sat, 29 Aug 2020 07:51:58 GMT",
"version": "v1"
}
] | 2020-09-01 | [
[
"Palenzuela",
"Carlos",
""
]
] | Numerical Relativity is a multidisciplinary field including relativity, magneto-hydrodynamics, astrophysics and computational methods, among others, with the aim of solving numerically highly-dynamical, strong-gravity scenarios where no other approximations are available. Here we describe some of the foundations of the... |
gr-qc/0609019 | James Lindesay | James Lindesay | Coordinates with Non-Singular Curvature for a Time Dependent Black Hole
Horizon | 15 pages, 1 figure, additional citations | Found.Phys.37:1181-1196,2007 | 10.1007/s10701-007-9146-4 | null | gr-qc | null | A naive introduction of a dependency of the mass of a black hole on the
Schwarzschild time coordinate results in singular behavior of curvature
invariants at the horizon, violating expectations from complementarity. If
instead a temporal dependence is introduced in terms of a coordinate akin to
the river time represe... | [
{
"created": "Wed, 6 Sep 2006 14:30:01 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Oct 2006 15:58:14 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lindesay",
"James",
""
]
] | A naive introduction of a dependency of the mass of a black hole on the Schwarzschild time coordinate results in singular behavior of curvature invariants at the horizon, violating expectations from complementarity. If instead a temporal dependence is introduced in terms of a coordinate akin to the river time represent... |
2108.10795 | Jaume Haro | Llibert Arest\'e Sal\'o and Jaume de Haro | Gravitational particle production of superheavy massive particles in
Quintessential Inflation: A numerical analysis | 15 pages, 7 figures. 1 reference added. Version accepted for
publication in PRD. arXiv admin note: text overlap with arXiv:1903.01181 | null | 10.1103/PhysRevD.104.083544 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We compute numerically the reheating temperature due to the gravitational
production of conformally coupled superheavy particles during the phase
transition from the end of inflation to the beginning of kination in two
different Quintessential Inflation (QI) scenarios, namely Lorentzian
Quintessential Inflation (LQI)... | [
{
"created": "Tue, 24 Aug 2021 15:34:14 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Aug 2021 17:20:28 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Oct 2021 08:00:16 GMT",
"version": "v3"
}
] | 2021-11-10 | [
[
"Saló",
"Llibert Aresté",
""
],
[
"de Haro",
"Jaume",
""
]
] | We compute numerically the reheating temperature due to the gravitational production of conformally coupled superheavy particles during the phase transition from the end of inflation to the beginning of kination in two different Quintessential Inflation (QI) scenarios, namely Lorentzian Quintessential Inflation (LQI) a... |
gr-qc/9602050 | Viqar Husain | Viqar Husain | Einstein's equations and the chiral model | 22 pages, RevTeX, to appear in Phys. Rev. D | Phys.Rev. D53 (1996) 4327-4334 | 10.1103/PhysRevD.53.4327 | CGPG-95/10-4 | gr-qc hep-th | null | The vacuum Einstein equations for spacetimes with two commuting spacelike
Killing field symmetries are studied using the Ashtekar variables. The case of
compact spacelike hypersurfaces which are three-tori is considered, and the
determinant of the Killing two-torus metric is chosen as the time gauge. The
Hamiltonian ... | [
{
"created": "Mon, 26 Feb 1996 21:23:54 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Husain",
"Viqar",
""
]
] | The vacuum Einstein equations for spacetimes with two commuting spacelike Killing field symmetries are studied using the Ashtekar variables. The case of compact spacelike hypersurfaces which are three-tori is considered, and the determinant of the Killing two-torus metric is chosen as the time gauge. The Hamiltonian ev... |
gr-qc/0511039 | Merab Gogberashvili Dr | Merab Gogberashvili | Acceleration of a Spherical Brane-Universe | The version accepted by Phys. Lett. B | Phys.Lett. B636 (2006) 147-149 | 10.1016/j.physletb.2005.12.072 | null | gr-qc astro-ph hep-th | null | The model where the universe is considered as an expanding spherical 3-brane
allows us to explain its expansion rate without a dark energy component. In
this scenario the computed redshift that corresponds to the transition from
cosmic deceleration to acceleration is in a good agreement with observations.
| [
{
"created": "Tue, 8 Nov 2005 16:27:19 GMT",
"version": "v1"
},
{
"created": "Sun, 19 Mar 2006 17:19:23 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Gogberashvili",
"Merab",
""
]
] | The model where the universe is considered as an expanding spherical 3-brane allows us to explain its expansion rate without a dark energy component. In this scenario the computed redshift that corresponds to the transition from cosmic deceleration to acceleration is in a good agreement with observations. |
2104.10423 | Sergey Pavluchenko A. | Sergey A. Pavluchenko | Exponential cosmological solutions in Einstein-Gauss-Bonnet gravity with
two subspaces: general approach | 32 pages, 7 figures; note added | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we perform systematic investigation of all possible exponential
solutions in Einstein-Gauss-Bonnet gravity with the spatial section being a
product of two subspaces. We describe a scheme which always allow to find
solution for a given $\{p, q\} > 2$ (number of dimensions of two subspaces) and
$\zeta$ (r... | [
{
"created": "Wed, 21 Apr 2021 09:05:19 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Apr 2021 20:16:51 GMT",
"version": "v2"
}
] | 2021-04-26 | [
[
"Pavluchenko",
"Sergey A.",
""
]
] | In this paper we perform systematic investigation of all possible exponential solutions in Einstein-Gauss-Bonnet gravity with the spatial section being a product of two subspaces. We describe a scheme which always allow to find solution for a given $\{p, q\} > 2$ (number of dimensions of two subspaces) and $\zeta$ (rat... |
0905.4425 | Kirill Bronnikov | K.A. Bronnikov, O.B. Zaslavskii | Horizons in matter: black hole hair vs. Null Big Bang | 4 pages, essay written for the Gravity Research Foundation 2009
Awards for Essays on Gravitation, awarded a honorable mention | Int.J.Mod.Phys.D18:2283-2287,2009 | 10.1142/S0218271809015898 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that only particular kinds of matter (in terms of the "radial"
pressure to density ratio $w$) can coexist with Killing horizons in black-hole
or cosmological space-times. Thus, for arbitrary (not necessarily spherically
symmetric) static black holes, admissible are vacuum matter ($w=-1$, i.e., the
cosmolo... | [
{
"created": "Wed, 27 May 2009 13:51:42 GMT",
"version": "v1"
}
] | 2010-02-17 | [
[
"Bronnikov",
"K. A.",
""
],
[
"Zaslavskii",
"O. B.",
""
]
] | It is shown that only particular kinds of matter (in terms of the "radial" pressure to density ratio $w$) can coexist with Killing horizons in black-hole or cosmological space-times. Thus, for arbitrary (not necessarily spherically symmetric) static black holes, admissible are vacuum matter ($w=-1$, i.e., the cosmologi... |
1807.09502 | Bobir Toshmatov | Bobir Toshmatov, Zden\v{e}k Stuchl\'ik, Bobomurat Ahmedov | Comment on "Construction of regular black holes in general relativity" | Comment on the paper arXiv:1610.02636 [gr-qc] based on our preceding
paper arXiv:1805.00240 [gr-qc]. Accepted for publication in Phys. Rev. D | Phys. Rev. D 98, 028501 (2018) | 10.1103/PhysRevD.98.028501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We claim that the physical parameters of the constructed black hole solutions
in general relativity (GR) coupled to nonlinear electrodynamics (NED) by
Zhong-Ying Fan and Xiaobao Wang in the Paper [Phys. Rev. D 94, 124027 (2016)]
are misinterpreted, despite the formalism being correct. We argue that because
of these m... | [
{
"created": "Wed, 25 Jul 2018 09:38:36 GMT",
"version": "v1"
}
] | 2018-07-31 | [
[
"Toshmatov",
"Bobir",
""
],
[
"Stuchlík",
"Zdeněk",
""
],
[
"Ahmedov",
"Bobomurat",
""
]
] | We claim that the physical parameters of the constructed black hole solutions in general relativity (GR) coupled to nonlinear electrodynamics (NED) by Zhong-Ying Fan and Xiaobao Wang in the Paper [Phys. Rev. D 94, 124027 (2016)] are misinterpreted, despite the formalism being correct. We argue that because of these mis... |
1703.05620 | Thomas Zilker | Thomas Zilker | Interpreting the isolated horizon boundary condition in terms of higher
gauge theory | 4 pages | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this letter is to point out a relation between the boundary
condition satisfied by spherically symmetric isolated horizons (formulated in
terms of Ashtekar-Barbero variables) and the source-target matching condition
(also known as fake flatness condition) in higher gauge theory. This relation
may prove... | [
{
"created": "Thu, 16 Mar 2017 13:49:34 GMT",
"version": "v1"
}
] | 2017-03-17 | [
[
"Zilker",
"Thomas",
""
]
] | The purpose of this letter is to point out a relation between the boundary condition satisfied by spherically symmetric isolated horizons (formulated in terms of Ashtekar-Barbero variables) and the source-target matching condition (also known as fake flatness condition) in higher gauge theory. This relation may prove u... |
1108.3186 | Shaun Hooper | Shaun Hooper (UWA), Shin Kee Chung (UWA), Jing Luan (Caltech), David
Blair (UWA), Yanbei Chen (Caltech), Linqing Wen (UWA) | Summed Parallel Infinite Impulse Response (SPIIR) Filters For
Low-Latency Gravitational Wave Detection | 9 pages, 6 figures, for PRD | Phys. Rev. D 86, 024012 (2012) | 10.1103/PhysRevD.86.024012 | null | gr-qc astro-ph.IM | http://creativecommons.org/licenses/by/3.0/ | With the upgrade of current gravitational wave detectors, the first detection
of gravitational wave signals is expected to occur in the next decade.
Low-latency gravitational wave triggers will be necessary to make fast
follow-up electromagnetic observations of events related to their source, e.g.,
prompt optical emi... | [
{
"created": "Tue, 16 Aug 2011 09:19:50 GMT",
"version": "v1"
}
] | 2012-07-20 | [
[
"Hooper",
"Shaun",
"",
"UWA"
],
[
"Chung",
"Shin Kee",
"",
"UWA"
],
[
"Luan",
"Jing",
"",
"Caltech"
],
[
"Blair",
"David",
"",
"UWA"
],
[
"Chen",
"Yanbei",
"",
"Caltech"
],
[
"Wen",
"Linqing",
"",
"... | With the upgrade of current gravitational wave detectors, the first detection of gravitational wave signals is expected to occur in the next decade. Low-latency gravitational wave triggers will be necessary to make fast follow-up electromagnetic observations of events related to their source, e.g., prompt optical emiss... |
2310.02517 | Darsan S. Bellie | Darsan S. Bellie, Sharan Banagiri, Zoheyr Doctor, Vicky Kalogera | The unresolved stochastic background from compact binary mergers
detectable by next-generation ground-based gravitational-wave observatories | 19 pages, 8 figures | null | null | null | gr-qc astro-ph.HE hep-ph | http://creativecommons.org/licenses/by/4.0/ | The next generation of ground-based gravitational-wave detectors will look
much deeper into the Universe and have unprecedented sensitivities and
low-frequency capabilities. Especially alluring is the possibility of detecting
an early-Universe cosmological stochastic background that could provide
important insights i... | [
{
"created": "Wed, 4 Oct 2023 01:32:31 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Oct 2023 19:21:36 GMT",
"version": "v2"
}
] | 2023-10-16 | [
[
"Bellie",
"Darsan S.",
""
],
[
"Banagiri",
"Sharan",
""
],
[
"Doctor",
"Zoheyr",
""
],
[
"Kalogera",
"Vicky",
""
]
] | The next generation of ground-based gravitational-wave detectors will look much deeper into the Universe and have unprecedented sensitivities and low-frequency capabilities. Especially alluring is the possibility of detecting an early-Universe cosmological stochastic background that could provide important insights int... |
1406.1053 | Joao Magueijo | John D. Barrow and Joao Magueijo | Redshifting of cosmological black bodies in BSBM varying-alpha theories | null | Phys. Rev. D90 (2014) 123506 | 10.1103/PhysRevD.90.123506 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the behaviour of black-body radiation in theories of
electromagnetism which allow the electron charge and the fine structure
constant to vary in space and time. We show that such theories can be expressed
as relativistic generalizations of a conventional dielectric. By making the
appropriate definition of ... | [
{
"created": "Wed, 4 Jun 2014 14:23:17 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Nov 2014 11:09:43 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Barrow",
"John D.",
""
],
[
"Magueijo",
"Joao",
""
]
] | We analyse the behaviour of black-body radiation in theories of electromagnetism which allow the electron charge and the fine structure constant to vary in space and time. We show that such theories can be expressed as relativistic generalizations of a conventional dielectric. By making the appropriate definition of th... |
1605.05694 | Steven Carlip | S. Carlip | Spontaneous Dimensional Reduction in Quantum Gravity | Third award, 2016 Gravity Research Foundation Essay Contest | null | 10.1142/S0218271816430033 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hints from a number of different approaches to quantum gravity point to a
phenomenon of "spontaneous dimensional reduction" to two spacetime dimensions
near the Planck scale. I examine the physical meaning of the term "dimension"
in this context, summarize the evidence for dimensional reduction, and discuss
possible ... | [
{
"created": "Wed, 18 May 2016 18:46:25 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Carlip",
"S.",
""
]
] | Hints from a number of different approaches to quantum gravity point to a phenomenon of "spontaneous dimensional reduction" to two spacetime dimensions near the Planck scale. I examine the physical meaning of the term "dimension" in this context, summarize the evidence for dimensional reduction, and discuss possible ph... |
1411.2822 | Salvatore Capozziello | Salvatore Capozziello, Mariafelicia De Laurentis, Orlando Luongo | Connecting early and late universe by $f(R)$ gravity | 26 pages, review paper to appear in International Journal of Modern
Physics D | null | 10.1142/S0218271815410023 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inflation and dark energy are two of the most relevant aspects of modern
cosmology. These different epochs provide the universe is passing through
accelerated phases soon after the Big-Bang and at present stage of its
evolution. In this review paper, we discuss that both eras can be, in
principle, described by a geom... | [
{
"created": "Mon, 27 Oct 2014 09:42:15 GMT",
"version": "v1"
}
] | 2015-06-23 | [
[
"Capozziello",
"Salvatore",
""
],
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Luongo",
"Orlando",
""
]
] | Inflation and dark energy are two of the most relevant aspects of modern cosmology. These different epochs provide the universe is passing through accelerated phases soon after the Big-Bang and at present stage of its evolution. In this review paper, we discuss that both eras can be, in principle, described by a geomet... |
gr-qc/9706035 | Miguel Navarro | Miguel Navarro (Instituto Carlos I (Universidad de Granada)) | Symmetries in two-dimensional dilaton gravity with matter | Minor changes have been made; the references have been updated and
some added; 11 pages. To appear in Phys. Rev. D | Phys.Rev.D56:7792-7796,1997 | 10.1103/PhysRevD.56.7792 | null | gr-qc | null | The symmetries of generic 2D dilaton models of gravity with (and without)
matter are studied in some detail. It is shown that $\delta_2$, one of the
symmetries of the matterless models, can be generalized to the case where
matter fields of any kind are present. The general (classical) solution for
some of these model... | [
{
"created": "Fri, 13 Jun 1997 09:40:07 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Sep 1997 14:44:33 GMT",
"version": "v2"
}
] | 2011-09-09 | [
[
"Navarro",
"Miguel",
"",
"Instituto Carlos I"
]
] | The symmetries of generic 2D dilaton models of gravity with (and without) matter are studied in some detail. It is shown that $\delta_2$, one of the symmetries of the matterless models, can be generalized to the case where matter fields of any kind are present. The general (classical) solution for some of these models,... |
2006.03542 | Junji Jia | Haotian Liu, Junji Jia | Universal time delay in static spherically symmetric spacetimes for null
and timelike signals | 7 pages, 2 figure; added more explanation for some steps; typos
corrected | null | 10.1088/1674-1137/ac03ab | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A perturbative method to compute the total travel time of both null and
lightlike rays in arbitrary static spherically symmetric spacetimes in the weak
field limit is proposed. The resultant total time takes a quasi-series form of
the impact parameter. The coefficient of this series at a certain order $n$ is
shown to... | [
{
"created": "Fri, 5 Jun 2020 16:29:15 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Feb 2021 14:41:09 GMT",
"version": "v2"
}
] | 2021-09-01 | [
[
"Liu",
"Haotian",
""
],
[
"Jia",
"Junji",
""
]
] | A perturbative method to compute the total travel time of both null and lightlike rays in arbitrary static spherically symmetric spacetimes in the weak field limit is proposed. The resultant total time takes a quasi-series form of the impact parameter. The coefficient of this series at a certain order $n$ is shown to b... |
gr-qc/9809053 | null | Salvatore Capozziello, Salvatore De Martino, Silvio De Siena, Fabrizio
Illuminati | Quantum Signature of Cosmological Large Scale Structures | 12 pages, REVTEX, submitted in Phys. Lett.A | null | null | null | gr-qc | null | We demonstrate that to all large scale cosmological structures where
gravitation is the only overall relevant interaction assembling the system
(e.g. galaxies), there is associated a characteristic unit of action per
particle whose order of magnitude coincides with the Planck action constant
$h$. This result extends ... | [
{
"created": "Thu, 17 Sep 1998 13:02:30 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Capozziello",
"Salvatore",
""
],
[
"De Martino",
"Salvatore",
""
],
[
"De Siena",
"Silvio",
""
],
[
"Illuminati",
"Fabrizio",
""
]
] | We demonstrate that to all large scale cosmological structures where gravitation is the only overall relevant interaction assembling the system (e.g. galaxies), there is associated a characteristic unit of action per particle whose order of magnitude coincides with the Planck action constant $h$. This result extends th... |
2204.01792 | Kumar Shwetketu Virbhadra | K. S. Virbhadra | Compactness of supermassive dark objects at galactic centers | This paper is dedicated to the memory of my guru Professor P. C.
Vaidya. (In Sanskrit, gu means darkness and ru means one who dispels.) | Canadian J Physics 102 512 (2024) | null | null | gr-qc astro-ph.CO astro-ph.GA astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We define compactness of a gravitational lens as the scaled closest distance
of approach (i.e., $r_0/M$) of the null geodesic giving rise to an image. We
model forty supermassive dark objects as Schwarzschild lenses and compute
compactness of lenses (determined by the formation of the first order
relativistic image).... | [
{
"created": "Mon, 4 Apr 2022 18:41:40 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Aug 2023 23:29:45 GMT",
"version": "v2"
},
{
"created": "Sat, 10 Aug 2024 14:04:28 GMT",
"version": "v3"
}
] | 2024-08-13 | [
[
"Virbhadra",
"K. S.",
""
]
] | We define compactness of a gravitational lens as the scaled closest distance of approach (i.e., $r_0/M$) of the null geodesic giving rise to an image. We model forty supermassive dark objects as Schwarzschild lenses and compute compactness of lenses (determined by the formation of the first order relativistic image). W... |
gr-qc/9405055 | null | Sean A. Hayward | Confinement by Black Holes | 5 pages. Figures not included | null | null | null | gr-qc | null | The question of whether an observer can escape from a black hole is
addressed, using a recent general definition of a black hole in the form of a
future outer trapping horizon. An observer on a future outer trapping horizon
must enter the neighbouring trapped region. It is possible for the observer to
subsequently es... | [
{
"created": "Wed, 25 May 1994 06:00:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hayward",
"Sean A.",
""
]
] | The question of whether an observer can escape from a black hole is addressed, using a recent general definition of a black hole in the form of a future outer trapping horizon. An observer on a future outer trapping horizon must enter the neighbouring trapped region. It is possible for the observer to subsequently esca... |
gr-qc/9307010 | Jorge Pullin | Carsten Gundlach, Richard Price adn Jorge Pullin | Late-Time Behavior of Stellar Collapse and Explosions: II. Nonlinear
Evolution | 23pp, RevTex, 15 figures (included), NSF-ITP-93-85 | Phys.Rev. D49 (1994) 890-899 | 10.1103/PhysRevD.49.890 | null | gr-qc astro-ph | null | Problem with the figures should be corrected. Apparently a broken uuencoder
was the cause.
| [
{
"created": "Sat, 10 Jul 1993 17:11:40 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jul 1993 16:16:13 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Gundlach",
"Carsten",
""
],
[
"Pullin",
"Richard Price adn Jorge",
""
]
] | Problem with the figures should be corrected. Apparently a broken uuencoder was the cause. |
1609.07146 | Shahar Hod | Shahar Hod | Analytic treatment of the system of a Kerr-Newman black hole and a
charged massive scalar field | 11 pages | Physical Review D 94, 044036 (2016) | 10.1103/PhysRevD.94.044036 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Charged rotating Kerr-Newman black holes are known to be superradiantly
unstable to perturbations of charged massive bosonic fields whose proper
frequencies lie in the bounded regime $0 < \omega < \text{min}
\{\omega_{\text{c}} \equiv m \Omega_{\text{H}} + q\Phi_{\text{H}},\mu\}$ [here
$\{\Omega_{\text{H}}, \Phi_{\te... | [
{
"created": "Thu, 22 Sep 2016 20:00:02 GMT",
"version": "v1"
}
] | 2016-09-28 | [
[
"Hod",
"Shahar",
""
]
] | Charged rotating Kerr-Newman black holes are known to be superradiantly unstable to perturbations of charged massive bosonic fields whose proper frequencies lie in the bounded regime $0 < \omega < \text{min} \{\omega_{\text{c}} \equiv m \Omega_{\text{H}} + q\Phi_{\text{H}},\mu\}$ [here $\{\Omega_{\text{H}}, \Phi_{\text... |
gr-qc/0007012 | Ratbay Myrzakulov | Kur. Myrzakul and R.Myrzakulov | Notes on Riemann geometry and integrable systems. Part IV | 17 pages, latex, no figures | null | null | null | gr-qc | null | The connection between multidimensional soliton equations and
three-dimensional Riemann space is discussed.
| [
{
"created": "Sun, 9 Jul 2000 00:51:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Myrzakul",
"Kur.",
""
],
[
"Myrzakulov",
"R.",
""
]
] | The connection between multidimensional soliton equations and three-dimensional Riemann space is discussed. |
2008.12726 | Oliver Rinne | Oliver Rinne | Type II critical collapse on a single fixed grid: a gauge-driven ingoing
boundary method | 15 pages, 5 figures | General Relativity and Gravitation 52:117 (2020) | 10.1007/s10714-020-02768-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop a numerical method suitable for gravitational collapse based on
Cauchy evolution with an ingoing characteristic boundary. Unlike similar
methods proposed recently (Ripley; Bieri, Garfinkle & Yau 2019/20), the
numerical grid remains fixed during the evolution and no points need to be
removed or added. Incre... | [
{
"created": "Fri, 28 Aug 2020 16:30:14 GMT",
"version": "v1"
}
] | 2020-12-04 | [
[
"Rinne",
"Oliver",
""
]
] | We develop a numerical method suitable for gravitational collapse based on Cauchy evolution with an ingoing characteristic boundary. Unlike similar methods proposed recently (Ripley; Bieri, Garfinkle & Yau 2019/20), the numerical grid remains fixed during the evolution and no points need to be removed or added. Increas... |
2305.15499 | Purba Mukherjee | Konstantinos F. Dialektopoulos, Purba Mukherjee, Jackson Levi Said,
Jurgen Mifsud | Neural network reconstruction of cosmology using the Pantheon
compilation | 11 pages, 12 sets of figures, Accepted for publication in EPJ C | Eur. Phys. J. C 83, 956 (2023) | 10.1140/epjc/s10052-023-12124-3 | null | gr-qc astro-ph.CO cs.LG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we reconstruct the Hubble diagram using various data sets,
including correlated ones, in Artificial Neural Networks (ANN). Using ReFANN,
that was built for data sets with independent uncertainties, we expand it to
include non-Guassian data points, as well as data sets with covariance matrices
among othe... | [
{
"created": "Wed, 24 May 2023 18:42:21 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Oct 2023 04:27:53 GMT",
"version": "v2"
}
] | 2023-11-01 | [
[
"Dialektopoulos",
"Konstantinos F.",
""
],
[
"Mukherjee",
"Purba",
""
],
[
"Said",
"Jackson Levi",
""
],
[
"Mifsud",
"Jurgen",
""
]
] | In this work, we reconstruct the Hubble diagram using various data sets, including correlated ones, in Artificial Neural Networks (ANN). Using ReFANN, that was built for data sets with independent uncertainties, we expand it to include non-Guassian data points, as well as data sets with covariance matrices among others... |
gr-qc/0606120 | Steven Carlip | P. J. Salzman and S. Carlip | A possible experimental test of quantized gravity | 9 pages, 2 ps figures | null | null | UCD-06-14 | gr-qc hep-th quant-ph | null | While it is widely believed that gravity should ultimately be treated as a
quantum theory, there remains a possibility that general relativity should not
be quantized. If this is the case, the coupling of classical gravity to the
expectation value of the quantum stress-energy tensor will naturally lead to
nonlinearit... | [
{
"created": "Wed, 28 Jun 2006 16:58:00 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Salzman",
"P. J.",
""
],
[
"Carlip",
"S.",
""
]
] | While it is widely believed that gravity should ultimately be treated as a quantum theory, there remains a possibility that general relativity should not be quantized. If this is the case, the coupling of classical gravity to the expectation value of the quantum stress-energy tensor will naturally lead to nonlinearitie... |
2202.03830 | Kristen Lackeos | Richard Lieu, Kristen Lackeos, Bing Zhang | Damping of long wavelength gravitational waves by the intergalactic
medium | CQG in print | null | 10.1088/1361-6382/ac5376 | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | The problem of radiation by the charged particles of the intergalactic medium
(IGM) when a passing gravitational wave (GW) accelerate them is investigated.
The largest acceleration (taking a charge from rest to a maximum speed which
remains non-relativistic in the rest frame of the unperturbed spacetime) is
found to ... | [
{
"created": "Tue, 1 Feb 2022 15:37:04 GMT",
"version": "v1"
}
] | 2022-04-13 | [
[
"Lieu",
"Richard",
""
],
[
"Lackeos",
"Kristen",
""
],
[
"Zhang",
"Bing",
""
]
] | The problem of radiation by the charged particles of the intergalactic medium (IGM) when a passing gravitational wave (GW) accelerate them is investigated. The largest acceleration (taking a charge from rest to a maximum speed which remains non-relativistic in the rest frame of the unperturbed spacetime) is found to be... |
gr-qc/9509011 | Robin W. Tucker | Robin W Tucker, Charles Wang | Black Holes with Weyl Charge and Non-Riemannian Waves | 18 pages Plain Tex (No Figures), Classical and Quantum Gravity | Class.Quant.Grav.12:2587-2605,1995 | 10.1088/0264-9381/12/10/016 | null | gr-qc | null | A simple modification to Einstein's theory of gravity in terms of a
non-Riemannian connection is examined. A new tensor-variational approach yields
field equations that possess a covariance similar to the gauge covariance of
electromagnetism. These equations are shown to possess solutions analogous to
those found in ... | [
{
"created": "Wed, 6 Sep 1995 13:57:25 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Tucker",
"Robin W",
""
],
[
"Wang",
"Charles",
""
]
] | A simple modification to Einstein's theory of gravity in terms of a non-Riemannian connection is examined. A new tensor-variational approach yields field equations that possess a covariance similar to the gauge covariance of electromagnetism. These equations are shown to possess solutions analogous to those found in th... |
gr-qc/9607038 | Phil Fraundorf | P. Fraundorf (Physics & Astronomy, U. Missouri-StL) | Non-coordinate time/velocity pairs in special relativity | RevTeX, full (3+1)D treatment w/5 tables, 1bw and 1greyscale figure.
Mat'l on 1D origins at http://www.umsl.edu/~fraundor/a1toc.html | null | null | UMStL-CME-960625pf | gr-qc physics.ed-ph | null | Motions with respect to one inertial (or ``map'') frame are often described
in terms of the coordinate time/velocity pair (or ``kinematic'') of the map
frame itself. Since not all observers experience time in the same way, other
time/velocity pairs describe map-frame trajectories as well. Such coexisting
kinematics p... | [
{
"created": "Wed, 17 Jul 1996 20:28:06 GMT",
"version": "v1"
}
] | 2008-02-03 | [
[
"Fraundorf",
"P.",
"",
"Physics & Astronomy, U. Missouri-StL"
]
] | Motions with respect to one inertial (or ``map'') frame are often described in terms of the coordinate time/velocity pair (or ``kinematic'') of the map frame itself. Since not all observers experience time in the same way, other time/velocity pairs describe map-frame trajectories as well. Such coexisting kinematics pro... |
1812.10100 | Kai Lin | Kai Lin and Wei-Liang Qian | Neutral regular black hole solution in generalized Rastall gravity | null | Chinese Physics C 43(8):083106 (2019) | 10.1088/1674-1137/43/8/083106 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we investigate the static, spherically symmetric regular black
hole solutions in a generalized Rastall gravity. In particular, the
prescription of Rastall gravity implies that the present approach does not
necessarily involve nonlinear electrodynamics. Subsequently, the resulting
regular black hole solu... | [
{
"created": "Tue, 25 Dec 2018 12:51:12 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jul 2019 06:45:35 GMT",
"version": "v2"
}
] | 2019-07-25 | [
[
"Lin",
"Kai",
""
],
[
"Qian",
"Wei-Liang",
""
]
] | In this work, we investigate the static, spherically symmetric regular black hole solutions in a generalized Rastall gravity. In particular, the prescription of Rastall gravity implies that the present approach does not necessarily involve nonlinear electrodynamics. Subsequently, the resulting regular black hole soluti... |
gr-qc/0503110 | Ion I. Cot\u{a}escu | Ion I. Cot\u{a}escu, Ion I. Cot\u{a}escu Jr. and Nicolina Pop | The leader operators of the $(d+1)$-dimensional relativistic rotating
oscillators | 11 pages | Mod.Phys.Lett. A20 (2005) 1251-1259 | 10.1142/S0217732305017238 | null | gr-qc math-ph math.MP quant-ph | null | The main pairs of leader operators of the quantum models of relativistic
rotating oscillators in arbitrary dimensions are derived. To this end one
exploits the fact that these models generate P\"{o}schl-Teller radial problems
with remarkable properties of supersymmetry and shape invariance.
| [
{
"created": "Mon, 28 Mar 2005 09:37:52 GMT",
"version": "v1"
}
] | 2014-10-07 | [
[
"Cotăescu",
"Ion I.",
""
],
[
"Cotăescu",
"Ion I.",
"Jr."
],
[
"Pop",
"Nicolina",
""
]
] | The main pairs of leader operators of the quantum models of relativistic rotating oscillators in arbitrary dimensions are derived. To this end one exploits the fact that these models generate P\"{o}schl-Teller radial problems with remarkable properties of supersymmetry and shape invariance. |
1605.02461 | Emmanuil Saridakis | Kazuharu Bamba, Sergei D. Odintsov and Emmanuel N. Saridakis | Inflationary cosmology in unimodular $F(T)$ gravity | 11 pages, 2 figures, published version | Mod.Phys.Lett. A32 (2017) no.21, 1750114 | 10.1142/S0217732317501140 | FU-PCG-13 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the inflationary realization in the context of unimodular
$F(T)$ gravity, which is based on the $F(T)$ modification of teleparallel
gravity, in which one imposes the unimodular condition through the use of
Lagrange multipliers. We develop the general reconstruction procedure of the
$F(T)$ form that can... | [
{
"created": "Mon, 9 May 2016 08:12:34 GMT",
"version": "v1"
},
{
"created": "Sat, 27 May 2017 06:13:07 GMT",
"version": "v2"
}
] | 2017-06-29 | [
[
"Bamba",
"Kazuharu",
""
],
[
"Odintsov",
"Sergei D.",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We investigate the inflationary realization in the context of unimodular $F(T)$ gravity, which is based on the $F(T)$ modification of teleparallel gravity, in which one imposes the unimodular condition through the use of Lagrange multipliers. We develop the general reconstruction procedure of the $F(T)$ form that can g... |
0709.2257 | Llu\'is Bel | Ll. Bel | Uber das Gravitationsfeld eines Massenpunktes nach der Einstenschen
Theorie | typos corrected, new reference, minor text modifications | null | null | null | gr-qc physics.hist-ph | null | Schwarzschild's solution of Einstein's field equations in vacuum can be
written in many different forms. Unfortunately Schwarzschild's own original
form is less nice looking and simple than that latter derived by Droste and
Hilbert. We prove here that we can have both: a nice looking simple form and
the meaning that ... | [
{
"created": "Fri, 14 Sep 2007 11:01:00 GMT",
"version": "v1"
},
{
"created": "Sat, 29 Sep 2007 07:28:04 GMT",
"version": "v2"
}
] | 2007-09-29 | [
[
"Bel",
"Ll.",
""
]
] | Schwarzschild's solution of Einstein's field equations in vacuum can be written in many different forms. Unfortunately Schwarzschild's own original form is less nice looking and simple than that latter derived by Droste and Hilbert. We prove here that we can have both: a nice looking simple form and the meaning that Sc... |
2210.06477 | Dr. Sudhaker Upadhyay | Himanshu Kumar Sudhanshu, Sudhaker Upadhyay, Dharm Veer Singh and
Sunil Kumar | Corrected thermodynamics of $(2+1)D$ black hole conformally coupled to a
massless scalar | 11 pages, 7 captioned figures, published in Int. J. Theor. Phys | International Journal of Theoretical Physics (2022) 61:248 | 10.1007/s10773-022-05231-6 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the corrected entropy due to thermal fluctuation and their effect on
the thermodynamics of a conformally dressed black hole in three dimensions. We
find that the thermal fluctuation affects the entropy significantly for small
black holes. Various corrected thermodynamical variables are also calculated
for th... | [
{
"created": "Wed, 12 Oct 2022 16:51:49 GMT",
"version": "v1"
}
] | 2022-10-14 | [
[
"Sudhanshu",
"Himanshu Kumar",
""
],
[
"Upadhyay",
"Sudhaker",
""
],
[
"Singh",
"Dharm Veer",
""
],
[
"Kumar",
"Sunil",
""
]
] | We study the corrected entropy due to thermal fluctuation and their effect on the thermodynamics of a conformally dressed black hole in three dimensions. We find that the thermal fluctuation affects the entropy significantly for small black holes. Various corrected thermodynamical variables are also calculated for this... |
0910.2169 | Yousef Bisabr | Yousef Bisabr | Gravitational Coupling and Dynamical Reduction of The Cosmological
Constant | To appear in GRG | Gen.Rel.Grav.42:1211-1219,2010 | 10.1007/s10714-009-0903-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce a dynamical model to reduce a large cosmological constant to a
sufficiently small value. The basic ingredient in this model is a distinction
which has been made between the two unit systems used in cosmology and particle
physics. We have used a conformal invariant gravitational model to define a
particul... | [
{
"created": "Mon, 12 Oct 2009 14:30:49 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Bisabr",
"Yousef",
""
]
] | We introduce a dynamical model to reduce a large cosmological constant to a sufficiently small value. The basic ingredient in this model is a distinction which has been made between the two unit systems used in cosmology and particle physics. We have used a conformal invariant gravitational model to define a particular... |
1504.03280 | Michael Edmund Tobar | Cheng-Gang Shao, Yu-Jie Tan, Wen-Hai Tan, Shan-Qing Yang, Jun Luo,
Michael Edmund Tobar | Search for Lorentz invariance violation through tests of the
gravitational inverse square law at short-ranges | 5 pages, 3 figures. arXiv admin note: text overlap with
arXiv:1412.8362 by other authors | Phys. Rev. D 91, 102007 (2015) | 10.1103/PhysRevD.91.102007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A search for sidereal variations in the non-Newtonian force between two
tungsten plates separated at millimeter ranges sets experimental limits on
Lorentz invariance violation involving quadratic couplings of Riemann
curvature. We show that the Lorentz invariance violation force between two
finite flat plates is domi... | [
{
"created": "Mon, 13 Apr 2015 18:10:49 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Shao",
"Cheng-Gang",
""
],
[
"Tan",
"Yu-Jie",
""
],
[
"Tan",
"Wen-Hai",
""
],
[
"Yang",
"Shan-Qing",
""
],
[
"Luo",
"Jun",
""
],
[
"Tobar",
"Michael Edmund",
""
]
] | A search for sidereal variations in the non-Newtonian force between two tungsten plates separated at millimeter ranges sets experimental limits on Lorentz invariance violation involving quadratic couplings of Riemann curvature. We show that the Lorentz invariance violation force between two finite flat plates is domina... |
2012.14552 | Muhammad Zubair | M. Zubair, Hina Azmat | Complexity analysis of Cylindrically Symmetric Self-gravitating
Dynamical System in $f(R,T)$ Theory of Gravity | 17 pages | Physics of the Dark Universe 28 (2020) 100531 | 10.1016/j.dark.2020.100531 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this article, we have studied a cylindrically symmetric self-gravitating
dynamical object via complexity factor which is obtained through orthogonal
splitting of Reimann tensor in $f(R,T)$ theory of gravity. Our study is based
on the definition of complexity for dynamical sources, proposed by Herrera
\cite{12b}. W... | [
{
"created": "Sun, 27 Dec 2020 12:53:07 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Mar 2022 11:11:58 GMT",
"version": "v2"
}
] | 2022-03-14 | [
[
"Zubair",
"M.",
""
],
[
"Azmat",
"Hina",
""
]
] | In this article, we have studied a cylindrically symmetric self-gravitating dynamical object via complexity factor which is obtained through orthogonal splitting of Reimann tensor in $f(R,T)$ theory of gravity. Our study is based on the definition of complexity for dynamical sources, proposed by Herrera \cite{12b}. We ... |
2003.01024 | Govind Menon | Govind Menon | Force-free Electrodynamics and Foliations in an arbitrary Spacetime | 11 pages | null | 10.1088/1361-6382/abbf30 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we formulate the relationship between force-free
electrodynamics and foliations. The background metric, is considered
predetermined and electrically neutral, but otherwise arbitrary. As it turns
out, solutions to force-free electrodynamics is intimately connected to the
existence of foliations of a spac... | [
{
"created": "Mon, 2 Mar 2020 16:59:04 GMT",
"version": "v1"
},
{
"created": "Mon, 11 May 2020 20:17:01 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Jun 2020 12:36:27 GMT",
"version": "v3"
}
] | 2020-12-30 | [
[
"Menon",
"Govind",
""
]
] | In this paper we formulate the relationship between force-free electrodynamics and foliations. The background metric, is considered predetermined and electrically neutral, but otherwise arbitrary. As it turns out, solutions to force-free electrodynamics is intimately connected to the existence of foliations of a spacet... |
gr-qc/0505038 | Michael Rios | Michael Rios | A Jordan GNS Construction for the Holonomy-Flux *-algebra | 6 pages, no figures | null | null | null | gr-qc | null | The holonomy-flux *-algebra was recently proposed as an algebra of basic
kinematical observables for loop quantum gravity. We show the conventional GNS
construction breaks down when the the holonomy-flux *-algebra is allowed to be
a Jordan algebra of observables. To remedy this, we give a Jordan GNS
construction for ... | [
{
"created": "Mon, 9 May 2005 19:14:01 GMT",
"version": "v1"
},
{
"created": "Mon, 9 May 2005 21:11:57 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Rios",
"Michael",
""
]
] | The holonomy-flux *-algebra was recently proposed as an algebra of basic kinematical observables for loop quantum gravity. We show the conventional GNS construction breaks down when the the holonomy-flux *-algebra is allowed to be a Jordan algebra of observables. To remedy this, we give a Jordan GNS construction for th... |
1602.01141 | Cenalo Vaz | Souvik Sarkar, Cenalo Vaz, L.C.R. Wijewardhana | Quantum dust collapse in 2+1 dimensions | 9 pages, no figures. To appear in Phys. Rev. D | Phys. Rev. D 93, 043017 (2016) | 10.1103/PhysRevD.93.043017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we will examine the consequence of a canonical theory of
quantum dust collapse in 2+1 dimensions. The solution of the WDW equation
describing the collapse indicates that collapsing shells outside the apparent
horizon are accompanied by outgoing shells within the apparent horizon during
their collapse ph... | [
{
"created": "Tue, 2 Feb 2016 22:38:28 GMT",
"version": "v1"
}
] | 2016-03-02 | [
[
"Sarkar",
"Souvik",
""
],
[
"Vaz",
"Cenalo",
""
],
[
"Wijewardhana",
"L. C. R.",
""
]
] | In this paper we will examine the consequence of a canonical theory of quantum dust collapse in 2+1 dimensions. The solution of the WDW equation describing the collapse indicates that collapsing shells outside the apparent horizon are accompanied by outgoing shells within the apparent horizon during their collapse phas... |
1007.0051 | Peter Taylor | Adrian C. Ottewill and Peter Taylor | Vacuum Polarization on the Schwarzschild Metric with a Cosmic String | null | Phys.Rev.D82:104013,2010 | 10.1103/PhysRevD.82.104013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the problem of the renormalization of the vacuum polarization in
a symmetry space-time with axial but not spherical symmetry, Schwarzschild
space-time threaded by an infinite straight cosmic string. Unlike previous
calculations, our framework to compute the renormalized vacuum polarization
does not rely o... | [
{
"created": "Wed, 30 Jun 2010 23:54:04 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Ottewill",
"Adrian C.",
""
],
[
"Taylor",
"Peter",
""
]
] | We consider the problem of the renormalization of the vacuum polarization in a symmetry space-time with axial but not spherical symmetry, Schwarzschild space-time threaded by an infinite straight cosmic string. Unlike previous calculations, our framework to compute the renormalized vacuum polarization does not rely on ... |
2204.00544 | Aaron Zimmerman | Aaron Zimmerman | Matters of Gravity: The Newsletter of the Division of Gravitational
Physics of the American Physical Society. Number 55. April 2022 | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Contents: APS April Meeting, by Aaron Zimmerman; Cosmic Explorer, the Next
Exploration Step, by Varun Srivastava, Kathryne J. Daniel, and Stefan Ballmer
| [
{
"created": "Fri, 1 Apr 2022 16:12:22 GMT",
"version": "v1"
}
] | 2022-04-04 | [
[
"Zimmerman",
"Aaron",
""
]
] | Contents: APS April Meeting, by Aaron Zimmerman; Cosmic Explorer, the Next Exploration Step, by Varun Srivastava, Kathryne J. Daniel, and Stefan Ballmer |
1807.08840 | Elisa Maggio | Elisa Maggio, Vitor Cardoso, Sam R. Dolan, Paolo Pani | Ergoregion instability of exotic compact objects: electromagnetic and
gravitational perturbations and the role of absorption | v2: 11+3 pages, 5 figures. Refereed version: various improvements,
including numerical computation of the gravitational instability, conclusions
unchanged. v3: 11+4 pages, 5 figures. Refereed version: analytical and
numerical derivation of gravitational quasi-normal modes changed, qualitative
results and conclu... | Phys. Rev. D 99, 064007 (2019) | 10.1103/PhysRevD.99.064007 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spinning horizonless compact objects may be unstable against an 'ergoregion
instability'. We investigate this mechanism for electromagnetic perturbations
of ultracompact Kerr-like objects with a reflecting surface, extending previous
(numerical and analytical) work limited to the scalar case. We derive an
analytical ... | [
{
"created": "Mon, 23 Jul 2018 21:42:58 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Dec 2018 20:54:24 GMT",
"version": "v2"
},
{
"created": "Fri, 15 Feb 2019 15:41:23 GMT",
"version": "v3"
}
] | 2019-03-13 | [
[
"Maggio",
"Elisa",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Dolan",
"Sam R.",
""
],
[
"Pani",
"Paolo",
""
]
] | Spinning horizonless compact objects may be unstable against an 'ergoregion instability'. We investigate this mechanism for electromagnetic perturbations of ultracompact Kerr-like objects with a reflecting surface, extending previous (numerical and analytical) work limited to the scalar case. We derive an analytical re... |
1909.08354 | Orfeu Bertolami | Tiago D. Ferreira, Nuno A. Silva, O. Bertolami, C. Gomes, A. Guerreiro | Using numerical methods from nonlocal optics to simulate the dynamics of
N-body systems in alternative theories of gravity | 5 pages, 4 figures | Phys. Rev. E 101, 023301 (2020) | 10.1103/PhysRevE.101.023301 | null | gr-qc physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The generalized Schr\"odinger-Newton system of equations with both local and
nonlocal nonlinearities is widely used to describe light propagating in
nonlinear media under the paraxial approximation. However, its use is not
limited to optical systems and can be found to describe a plethora of different
physical phenom... | [
{
"created": "Wed, 18 Sep 2019 11:09:12 GMT",
"version": "v1"
}
] | 2020-02-12 | [
[
"Ferreira",
"Tiago D.",
""
],
[
"Silva",
"Nuno A.",
""
],
[
"Bertolami",
"O.",
""
],
[
"Gomes",
"C.",
""
],
[
"Guerreiro",
"A.",
""
]
] | The generalized Schr\"odinger-Newton system of equations with both local and nonlocal nonlinearities is widely used to describe light propagating in nonlinear media under the paraxial approximation. However, its use is not limited to optical systems and can be found to describe a plethora of different physical phenomen... |
1202.3297 | Izzet Sakalli | I. Sakalli | Quantization of Higher Dimensional Linear Dilaton Black Hole
Area/Entropy From Quasinormal Modes | Misprints in Eqs.(18) and (21), and within the conclusion are
corrected. Erratum (DOI: 10.1142/S0217751X13920024) | IJMPA Volume: 26, Issue: 13 pp. 2263-2269, 2011; 28, 1392002
(2013), Erratum | 10.1142/S0217751X11053316 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum spectra of area and entropy of higher dimensional linear dilaton
black holes in various theories via the quasinormal modes method are studied.
It is shown that quasinormal modes of these black holes can reveal themselves
when a specific condition holds. Finally, we obtain that a higher dimensional
linear ... | [
{
"created": "Wed, 15 Feb 2012 12:43:35 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Apr 2013 11:07:46 GMT",
"version": "v2"
},
{
"created": "Sat, 15 Feb 2014 10:42:26 GMT",
"version": "v3"
}
] | 2014-02-18 | [
[
"Sakalli",
"I.",
""
]
] | The quantum spectra of area and entropy of higher dimensional linear dilaton black holes in various theories via the quasinormal modes method are studied. It is shown that quasinormal modes of these black holes can reveal themselves when a specific condition holds. Finally, we obtain that a higher dimensional linear di... |
1108.0750 | Jose Magpantay | Jose A. Magpantay | Geodesics, Mass and the Uncertainty Principle in a Warped de Sitter
Space-time | 8 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the explicit solution to the geodesic equations in a warped de
Sitter space-time proposed by Randall-Sundrum. We find that a test particle
moves in the bulk and is not restricted on a 3-brane (to be taken as our
universe). On the 3-brane, the test particle moves with uniform velocity,
giving the appearance... | [
{
"created": "Wed, 3 Aug 2011 06:07:22 GMT",
"version": "v1"
}
] | 2011-08-04 | [
[
"Magpantay",
"Jose A.",
""
]
] | We present the explicit solution to the geodesic equations in a warped de Sitter space-time proposed by Randall-Sundrum. We find that a test particle moves in the bulk and is not restricted on a 3-brane (to be taken as our universe). On the 3-brane, the test particle moves with uniform velocity, giving the appearance t... |
gr-qc/9810026 | Matt Visser | Matt Visser (Washington University), Bruce Bassett (SISSA, Trieste),
Stefano Liberati (SISSA, Trieste) | Superluminal censorship | 4 pages, uses espcrc2.sty. Significant revisions: (1) the
perturbative analysis is extended; (2) the non-perturbative analysis in terms
of null infinity is abandoned | Nucl.Phys.Proc.Suppl. 88 (2000) 267-270 | 10.1016/S0920-5632(00)00782-9 | null | gr-qc hep-th | null | We argue that ``effective'' superluminal travel, potentially caused by the
tipping over of light cones in Einstein gravity, is always associated with
violations of the null energy condition (NEC). This is most easily seen by
working perturbatively around Minkowski spacetime, where we use linearized
Einstein gravity t... | [
{
"created": "Wed, 7 Oct 1998 23:24:13 GMT",
"version": "v1"
},
{
"created": "Wed, 15 Dec 1999 19:54:38 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Visser",
"Matt",
"",
"Washington University"
],
[
"Bassett",
"Bruce",
"",
"SISSA, Trieste"
],
[
"Liberati",
"Stefano",
"",
"SISSA, Trieste"
]
] | We argue that ``effective'' superluminal travel, potentially caused by the tipping over of light cones in Einstein gravity, is always associated with violations of the null energy condition (NEC). This is most easily seen by working perturbatively around Minkowski spacetime, where we use linearized Einstein gravity to ... |
2404.17208 | Mrinnoy Gohain | Mrinnoy M. Gohain, Chayanika Chetia and Kalyan Bhuyan | Wormhole Formation with Gravitational Particle Creation Mechanism | 12 pages, 16 figures; Made a few minor modifications. Suggestions and
Comments are welcome | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper, we explore the possibility of the formation of a traversable
wormhole geometry in General Relativity sustained by particle creation
mechanism. Gravitational particle creation mechanism is a thermodynamic
approach to generate repulsive back-reaction gravitational effects through the
thermodynamic creati... | [
{
"created": "Fri, 26 Apr 2024 07:33:53 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Apr 2024 05:40:06 GMT",
"version": "v2"
}
] | 2024-04-30 | [
[
"Gohain",
"Mrinnoy M.",
""
],
[
"Chetia",
"Chayanika",
""
],
[
"Bhuyan",
"Kalyan",
""
]
] | In this paper, we explore the possibility of the formation of a traversable wormhole geometry in General Relativity sustained by particle creation mechanism. Gravitational particle creation mechanism is a thermodynamic approach to generate repulsive back-reaction gravitational effects through the thermodynamic creation... |
1807.06467 | Muhammad Sharif | M. Sharif and Aisha Siddiqa | Study of Homogeneous and Isotropic Universe in $f(R,T^{\varphi})$
Gravity | 19 pages, 9 figures, to appear in AHEP | Ad. High Energy Phys. 2018(2018)9534279 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to study the cosmological behavior of homogeneous and
isotropic universe model in the context of $f(R,T^{\varphi})$ gravity where
$\varphi$ is the scalar field. For this purpose, we follow the first order
formalism defined by $H=W(\varphi)$. We evaluate Hubble parameter, effective
equation of st... | [
{
"created": "Mon, 16 Jul 2018 10:52:46 GMT",
"version": "v1"
}
] | 2018-07-30 | [
[
"Sharif",
"M.",
""
],
[
"Siddiqa",
"Aisha",
""
]
] | This paper is devoted to study the cosmological behavior of homogeneous and isotropic universe model in the context of $f(R,T^{\varphi})$ gravity where $\varphi$ is the scalar field. For this purpose, we follow the first order formalism defined by $H=W(\varphi)$. We evaluate Hubble parameter, effective equation of stat... |
2306.16336 | Massimo Giovannini | Massimo Giovannini | The invisible low-frequency gravitons and the audio band | 45 pages, 12 figures | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | The low-frequency gravitons correspond to typical wavelengths that left the
Hubble radius during the early inflationary stages of expansion and reentered
after matter radiation equality. Consequently the temperature and the
polarization anisotropies of the cosmic microwave background constrain the
tensor-to-scalar-ra... | [
{
"created": "Wed, 28 Jun 2023 16:11:53 GMT",
"version": "v1"
}
] | 2023-06-29 | [
[
"Giovannini",
"Massimo",
""
]
] | The low-frequency gravitons correspond to typical wavelengths that left the Hubble radius during the early inflationary stages of expansion and reentered after matter radiation equality. Consequently the temperature and the polarization anisotropies of the cosmic microwave background constrain the tensor-to-scalar-rati... |
2003.10902 | Alfredo Iorio | Alfredo Iorio and Pavel Kus | Vortex solutions of Liouville equation and quasi spherical surfaces | 17 pages, 15 figures; | null | 10.1142/S0219887820501066 | null | gr-qc cond-mat.other hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We identify the two-dimensional surfaces corresponding to certain solutions
of the Liouville equation of importance for mathematical physics, the
non-topological Chern-Simons (or Jackiw-Pi) vortex solutions, characterized by
an integer $N \ge 1$. Such surfaces, that we call $S^2 (N)$, have positive
constant Gaussian ... | [
{
"created": "Tue, 24 Mar 2020 14:59:04 GMT",
"version": "v1"
}
] | 2020-07-15 | [
[
"Iorio",
"Alfredo",
""
],
[
"Kus",
"Pavel",
""
]
] | We identify the two-dimensional surfaces corresponding to certain solutions of the Liouville equation of importance for mathematical physics, the non-topological Chern-Simons (or Jackiw-Pi) vortex solutions, characterized by an integer $N \ge 1$. Such surfaces, that we call $S^2 (N)$, have positive constant Gaussian cu... |
2308.01712 | Reginald Christian Bernardo | Stephen Appleby and Reginald Christian Bernardo | Tadpole Cosmology: Milne Solution as a Cosmological Constant Hideout | 20 pages + refs, 4 figures, comments welcome | JCAP 12 (2023) 003 | 10.1088/1475-7516/2023/12/003 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dynamical cancellation frameworks present a potential means of mitigating the
effect of a large vacuum energy, that would otherwise ruin the late-time, low
energy dynamics of the Universe. Certain models in the literature, such as the
Fab Four and Well Tempering, realize this idea by introducing some degeneracy
in th... | [
{
"created": "Thu, 3 Aug 2023 12:11:31 GMT",
"version": "v1"
}
] | 2023-12-14 | [
[
"Appleby",
"Stephen",
""
],
[
"Bernardo",
"Reginald Christian",
""
]
] | Dynamical cancellation frameworks present a potential means of mitigating the effect of a large vacuum energy, that would otherwise ruin the late-time, low energy dynamics of the Universe. Certain models in the literature, such as the Fab Four and Well Tempering, realize this idea by introducing some degeneracy in the ... |
1902.02033 | Ernesto Contreras | E. Contreras, \'A. Rinc\'on, P. Bargue\~no | A general interior anisotropic solution for a BTZ vacuum in the context
of the Minimal Geometric Deformation decoupling approach | Accepted in EPJC. References corrected | Eur. Phys. J. C (2019) 79:216 | 10.1140/epjc/s10052-019-6749-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we implement the Minimal Geometric Deformation decoupling method
to obtain general static interior solutions for a BTZ vacuum from the most
general isotropic solution in $2+1$ dimensions including the cosmological
constant $\Lambda$. We obtain that the general solution can be generated only
by the energy... | [
{
"created": "Wed, 6 Feb 2019 05:45:48 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Mar 2019 21:27:16 GMT",
"version": "v2"
}
] | 2019-04-01 | [
[
"Contreras",
"E.",
""
],
[
"Rincón",
"Á.",
""
],
[
"Bargueño",
"P.",
""
]
] | In this work we implement the Minimal Geometric Deformation decoupling method to obtain general static interior solutions for a BTZ vacuum from the most general isotropic solution in $2+1$ dimensions including the cosmological constant $\Lambda$. We obtain that the general solution can be generated only by the energy d... |
1907.08055 | Valerio Faraoni | Valerio Faraoni and Jeremy Cot\'e | Quasilocal mass and multipole expansion in scalar-tensor gravity | null | Phys. Rev. D 100, 084015 (2019) | 10.1103/PhysRevD.100.084015 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A generalization of the Hawking-Hayward quasilocal mass to scalar-tensor
gravity is compared, in vacuo and for asymptotically flat stationary
geometries, with a recent multipole expansion of the gravitational field. The
quasilocal mass seen at spatial infinity coincides with the monopole term,
lending credibility to ... | [
{
"created": "Thu, 18 Jul 2019 14:01:15 GMT",
"version": "v1"
}
] | 2019-10-16 | [
[
"Faraoni",
"Valerio",
""
],
[
"Coté",
"Jeremy",
""
]
] | A generalization of the Hawking-Hayward quasilocal mass to scalar-tensor gravity is compared, in vacuo and for asymptotically flat stationary geometries, with a recent multipole expansion of the gravitational field. The quasilocal mass seen at spatial infinity coincides with the monopole term, lending credibility to th... |
2007.02828 | Lloren\c{c} Espinosa-Portal\'es | Lloren\c{c} Espinosa-Portal\'es, Juan Garc\'ia-Bellido | Long-range enhanced mutual information from inflation | 16 pages, 3 figures. New results include additional enhancement of
the mutual information during the radiation era. Typos corrected; section III
extended; appendix, references and comments added. Matches version accepted
by PRD | Phys. Rev. D 103, 043537 (2021) | 10.1103/PhysRevD.103.043537 | IFT-UAM/CSIC-20-102 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum origin of cosmological primordial perturbations is a cornerstone
framework in the interplay between gravity and quantum physics. In this paper
we study the mutual information between two spatial regions in a
radiation-dominated universe filled by a curvature perturbation field in a
squeezed state. We find... | [
{
"created": "Mon, 6 Jul 2020 15:33:26 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Mar 2021 10:47:21 GMT",
"version": "v2"
}
] | 2021-03-02 | [
[
"Espinosa-Portalés",
"Llorenç",
""
],
[
"García-Bellido",
"Juan",
""
]
] | The quantum origin of cosmological primordial perturbations is a cornerstone framework in the interplay between gravity and quantum physics. In this paper we study the mutual information between two spatial regions in a radiation-dominated universe filled by a curvature perturbation field in a squeezed state. We find a... |
1901.01873 | Artyom Yurov | Artyom Yurov, Valerian Yurov | The Day the Universes Interacted: Quantum Cosmology without a Wave
function | 15 pages, RevTeX, 3 figures | Eur. Phys. J. C (2019) 79: 771 | 10.1140/epjc/s10052-019-7261-y | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we present a new outlook on the cosmology, based on the
quantum model proposed by M. Hall, D.-A. Deckert and H. Wiseman (HDW). In
continuation of the idea of that model we consider finitely many classical
homogeneous and isotropic universes whose evolutions are determined by the
standard Einstein-Frie... | [
{
"created": "Mon, 7 Jan 2019 15:08:22 GMT",
"version": "v1"
}
] | 2019-09-24 | [
[
"Yurov",
"Artyom",
""
],
[
"Yurov",
"Valerian",
""
]
] | In this article we present a new outlook on the cosmology, based on the quantum model proposed by M. Hall, D.-A. Deckert and H. Wiseman (HDW). In continuation of the idea of that model we consider finitely many classical homogeneous and isotropic universes whose evolutions are determined by the standard Einstein-Friedm... |
gr-qc/9402039 | Jorge Pullin | Richard H. Price and Jorge Pullin | Colliding Black Holes: The Close Limit | 4 pages, Revtex, 3 postscript figures included, CGPG-94/2-3 | Phys.Rev.Lett.72:3297-3300,1994 | 10.1103/PhysRevLett.72.3297 | null | gr-qc astro-ph | null | The problem of the mutual attraction and joining of two black holes is of
importance as both a source of gravitational waves and as a testbed of
numerical relativity. If the holes start out close enough that they are
initially surrounded by a common horizon, the problem can be viewed as a
perturbation of a single bla... | [
{
"created": "Tue, 22 Feb 1994 16:17:48 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Price",
"Richard H.",
""
],
[
"Pullin",
"Jorge",
""
]
] | The problem of the mutual attraction and joining of two black holes is of importance as both a source of gravitational waves and as a testbed of numerical relativity. If the holes start out close enough that they are initially surrounded by a common horizon, the problem can be viewed as a perturbation of a single black... |
1612.01726 | Charalampos Moustakidis | Ch.C. Moustakidis | The stability of relativistic stars and the role of the adiabatic index | 17 pages, 14 figures, 2 tables | General Relativity and Gravitation 49, 68 (2017) | null | null | gr-qc astro-ph.HE astro-ph.SR nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the stability of three analytical solutions of the Einstein's field
equations for spheres of fluid. These solutions are suitable to describe
compact objects including white dwarfs, neutron stars and supermassive stars
and they have been extensively employed in the literature. We re-examine the
range of stabi... | [
{
"created": "Tue, 6 Dec 2016 09:52:10 GMT",
"version": "v1"
},
{
"created": "Wed, 3 May 2017 06:17:32 GMT",
"version": "v2"
}
] | 2017-05-04 | [
[
"Moustakidis",
"Ch. C.",
""
]
] | We study the stability of three analytical solutions of the Einstein's field equations for spheres of fluid. These solutions are suitable to describe compact objects including white dwarfs, neutron stars and supermassive stars and they have been extensively employed in the literature. We re-examine the range of stabili... |
1201.0208 | Ran Li | Ran Li | Quasinormal modes and entropy spectrum of three dimensional Godel black
hole | 18 pages, no figures | Int. J. Mod. Phys. D, 21 (2012) 1250014 | 10.1142/S0218271812500149 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have studied perturbations of scalar and spinor field in the background of
three dimensional G\"{o}del black hole. The wave equations are shown to be
exactly solvable in terms of hypergeometric functions. The quasinormal modes
are analytically calculated by imposing the Dirichlet boundary condition at
spatial infi... | [
{
"created": "Sat, 31 Dec 2011 01:51:52 GMT",
"version": "v1"
}
] | 2012-03-12 | [
[
"Li",
"Ran",
""
]
] | We have studied perturbations of scalar and spinor field in the background of three dimensional G\"{o}del black hole. The wave equations are shown to be exactly solvable in terms of hypergeometric functions. The quasinormal modes are analytically calculated by imposing the Dirichlet boundary condition at spatial infini... |
1108.0893 | Parampreet Singh | Abhay Ashtekar, Parampreet Singh | Loop Quantum Cosmology: A Status Report | 138 pages, 15 figures. Invited Topical Review, To appear in Classical
and Quantum Gravity. Typos corrected, clarifications and references added | Class. Quant. Grav. 28: 213001,2011 | 10.1088/0264-9381/28/21/213001 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The goal of this article is to provide an overview of the current state of
the art in loop quantum cosmology for three sets of audiences: young
researchers interested in entering this area; the quantum gravity community in
general; and, cosmologists who wish to apply loop quantum cosmology to probe
modifications in t... | [
{
"created": "Wed, 3 Aug 2011 17:04:35 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Aug 2011 03:57:38 GMT",
"version": "v2"
}
] | 2011-09-23 | [
[
"Ashtekar",
"Abhay",
""
],
[
"Singh",
"Parampreet",
""
]
] | The goal of this article is to provide an overview of the current state of the art in loop quantum cosmology for three sets of audiences: young researchers interested in entering this area; the quantum gravity community in general; and, cosmologists who wish to apply loop quantum cosmology to probe modifications in the... |
1602.03172 | Mahouton J. Stephane Houndjo Dr | S. B. Nassur, C. Ainamon, M. J. S. Houndjo and J. Tossa | Unimodular f(T) gravity | 11 pages | Eur. Phys. J. Plus (2016) 131: 420 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reconstruct the geometrical $f(T)$ actions in the framework of unimodular
$f(T)$ gravity. The unimodular $f(T)$ gravity yields stunning properties
related to the generalized Friedmann equations. Indeed, it has been found that
depending on the form of the Friedmann equations, the Lagrange multipliers may
or not dep... | [
{
"created": "Mon, 8 Feb 2016 22:23:41 GMT",
"version": "v1"
}
] | 2017-01-03 | [
[
"Nassur",
"S. B.",
""
],
[
"Ainamon",
"C.",
""
],
[
"Houndjo",
"M. J. S.",
""
],
[
"Tossa",
"J.",
""
]
] | We reconstruct the geometrical $f(T)$ actions in the framework of unimodular $f(T)$ gravity. The unimodular $f(T)$ gravity yields stunning properties related to the generalized Friedmann equations. Indeed, it has been found that depending on the form of the Friedmann equations, the Lagrange multipliers may or not depen... |
1110.0291 | Gianluca Calcagni | Gianluca Calcagni | Inflationary spectra and observations in loop quantum cosmology | 4 pages, 2 figures. v2: text typo corrected | J. Phys.: Conf. Ser. 360 (2012) 012027 | 10.1088/1742-6596/360/1/012027 | AEI-2012-045 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review some recent progress in the extraction of inflationary observables
in loop quantum cosmology. Inverse-volume quantum corrections induce a growth
of power in the large-scale cosmological spectra and are constrained by
observations.
| [
{
"created": "Mon, 3 Oct 2011 08:09:33 GMT",
"version": "v1"
},
{
"created": "Tue, 22 May 2012 10:14:48 GMT",
"version": "v2"
}
] | 2012-05-23 | [
[
"Calcagni",
"Gianluca",
""
]
] | We review some recent progress in the extraction of inflationary observables in loop quantum cosmology. Inverse-volume quantum corrections induce a growth of power in the large-scale cosmological spectra and are constrained by observations. |
1906.05009 | Takeshi Tomitsuka | Takeshi Tomitsuka, Koji Yamaguchi, Masahiro Hotta | Partner formula for an arbitrary moving mirror in $1+1$ dimensions | 19 pages, 18 figures | Phys. Rev. D 101, 024003 (2020) | 10.1103/PhysRevD.101.024003 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the information loss problem in black hole evaporation, investigation of
the purification partner of a Hawking particle is crucial. It is a well-known
fact that 3+1 dimensional spherically symmetric gravitational collapse can be
approximately described by 1+1 dimensional moving mirror models. Since a
detected part... | [
{
"created": "Wed, 12 Jun 2019 08:50:25 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jun 2019 04:15:00 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Jan 2020 05:22:35 GMT",
"version": "v3"
}
] | 2020-01-10 | [
[
"Tomitsuka",
"Takeshi",
""
],
[
"Yamaguchi",
"Koji",
""
],
[
"Hotta",
"Masahiro",
""
]
] | In the information loss problem in black hole evaporation, investigation of the purification partner of a Hawking particle is crucial. It is a well-known fact that 3+1 dimensional spherically symmetric gravitational collapse can be approximately described by 1+1 dimensional moving mirror models. Since a detected partic... |
2405.13359 | Akshat Pandey | Akshat Pandey | A note on analogue semi-classical gravity in (1+1) dimensions | Published in Gravitation and Cosmology | null | 10.1134/S0202289324700129 | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | Acoustic spacetimes have been known to offer analogue models for black hole
physics and cosmology. Within this context, aspects of analogue quantum field
theories in curved spacetime are studied. In particular some new comments have
been made on the analogue Hawking temperature including a quick derivation of
the res... | [
{
"created": "Wed, 22 May 2024 05:32:28 GMT",
"version": "v1"
}
] | 2024-05-24 | [
[
"Pandey",
"Akshat",
""
]
] | Acoustic spacetimes have been known to offer analogue models for black hole physics and cosmology. Within this context, aspects of analogue quantum field theories in curved spacetime are studied. In particular some new comments have been made on the analogue Hawking temperature including a quick derivation of the resul... |
1201.3605 | Alfredo Lopez Ortega | R. Cordero, A. Lopez-Ortega and I. Vega-Acevedo | Quasinormal frequencies of asymptotically anti-de Sitter black holes in
two dimensions | 19 pages, 6 figures | null | 10.1007/s10714-011-1316-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate exactly the quasinormal frequencies of Klein-Gordon and Dirac
test fields propagating in two-dimensional uncharged Achucarro-Ortiz black
hole. For both test fields we study whether the quasinormal frequencies are
well defined in the massless limit. We use their values to discuss the
classical stability o... | [
{
"created": "Tue, 17 Jan 2012 20:12:33 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Cordero",
"R.",
""
],
[
"Lopez-Ortega",
"A.",
""
],
[
"Vega-Acevedo",
"I.",
""
]
] | We calculate exactly the quasinormal frequencies of Klein-Gordon and Dirac test fields propagating in two-dimensional uncharged Achucarro-Ortiz black hole. For both test fields we study whether the quasinormal frequencies are well defined in the massless limit. We use their values to discuss the classical stability of ... |
1307.7508 | Martin \v{C}erm\'ak | Martin \v{C}erm\'ak, Martin Zouhar | Cosmologically inspired Kastor-Traschen solution | Treatment of energy conditions extended, Misner-Sharp mass added,
more detailed discussion of trapped horizons and surfaces | Phys. Rev. D 89, 084024 (2014) | 10.1103/PhysRevD.89.084024 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Kastor-Traschen (KT) type solution in a cosmological set up is studied in
this article. We examine a hybrid of a KT metric and a
Friedmann-Robertson-Walker-Lemaitre (FRWL) solution. The problem is treated in
a general number of dimensions D>=4 and we include the cosmological constant
Lambda parameter into the Einstei... | [
{
"created": "Mon, 29 Jul 2013 09:32:06 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Jan 2014 19:59:25 GMT",
"version": "v2"
}
] | 2014-04-23 | [
[
"Čermák",
"Martin",
""
],
[
"Zouhar",
"Martin",
""
]
] | Kastor-Traschen (KT) type solution in a cosmological set up is studied in this article. We examine a hybrid of a KT metric and a Friedmann-Robertson-Walker-Lemaitre (FRWL) solution. The problem is treated in a general number of dimensions D>=4 and we include the cosmological constant Lambda parameter into the Einstein-... |
gr-qc/0511042 | Peter D'Eath | P.D.D'Eath | What local supersymmetry can do for quantum cosmology | Talk given at SWH60 birthday meeting, Cambridge, England, January
2002. Published in "The future of theoretical physics and cosmology", eds.
G.W.Gibbons, E.P.S.Shellard and S.J.Rankin (Cambridge Univ. Press, 2003) | null | null | null | gr-qc | null | The canonical approach to Riemannian quantum gravity is reviewed with
reference to local supersymmetry, to the classical boundary-value problem
arising from the Hartle-Hawking quantum state, and particularly for
(anti-)self-dual geometries. Two examples of the boundary-value problem for the
Einstein equations, possib... | [
{
"created": "Tue, 8 Nov 2005 15:37:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"D'Eath",
"P. D.",
""
]
] | The canonical approach to Riemannian quantum gravity is reviewed with reference to local supersymmetry, to the classical boundary-value problem arising from the Hartle-Hawking quantum state, and particularly for (anti-)self-dual geometries. Two examples of the boundary-value problem for the Einstein equations, possibly... |
1311.7680 | Rabia Saleem | M. Sharif, Rabia Saleem | Warm Anisotropic Inflationary Universe Model | 25 pages, 8 figures | Eur. Phys. J. C 74(2014)2738 | 10.1140/epjc/s10052-014-2738-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to study the warm inflation using vector fields in the
background of locally rotationally symmetric Bianchi type I universe model. We
formulate the field equations, slow-roll and perturbation parameters (scalar
and tensor power spectra as well as their spectral indices) under slow-roll
approxima... | [
{
"created": "Tue, 26 Nov 2013 03:27:36 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Sharif",
"M.",
""
],
[
"Saleem",
"Rabia",
""
]
] | This paper is devoted to study the warm inflation using vector fields in the background of locally rotationally symmetric Bianchi type I universe model. We formulate the field equations, slow-roll and perturbation parameters (scalar and tensor power spectra as well as their spectral indices) under slow-roll approximati... |
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