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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2405.09945 | Surajit Das | Surajit Das, Surojit Dalui and Rickmoy Samanta | Near-horizon chaos beyond Einstein gravity | 21 pages, 63 figures, 1 table | null | null | null | gr-qc hep-th nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate chaos in the dynamics of outgoing massless particles near the
horizon of static spherically symmetric (SSS) black holes in two well-motivated
models of $f(R)$ gravity. In both these models, we probe chaos in the particle
trajectories (under suitable harmonic confinement) in the vicinity of the black
ho... | [
{
"created": "Thu, 16 May 2024 09:50:42 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jun 2024 04:34:11 GMT",
"version": "v2"
}
] | 2024-06-21 | [
[
"Das",
"Surajit",
""
],
[
"Dalui",
"Surojit",
""
],
[
"Samanta",
"Rickmoy",
""
]
] | We investigate chaos in the dynamics of outgoing massless particles near the horizon of static spherically symmetric (SSS) black holes in two well-motivated models of $f(R)$ gravity. In both these models, we probe chaos in the particle trajectories (under suitable harmonic confinement) in the vicinity of the black hole... |
0911.2841 | Lorenzo Fatibene | M. Di Mauro, L. Fatibene, M. Ferraris, M. Francaviglia | Further Extended Theories of Gravitation: Part I | 10 pages. Some refs added | Int.J.Geom.Meth.Mod.Phys.7:887-898,2010 | 10.1142/S0219887810004592 10.1142/S0219887810004609 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We shall here propose a class of relativistic theories of gravitation, based
on a foundational paper of Ehlers Pirani and Schild (EPS).All "extended
theories of gravitation" (also known as f(R) theories) in Palatini formalism
are shown to belong to this class. In a forthcoming paper we shall show that
this class of t... | [
{
"created": "Sun, 15 Nov 2009 08:59:18 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jan 2010 11:18:00 GMT",
"version": "v2"
}
] | 2011-01-05 | [
[
"Di Mauro",
"M.",
""
],
[
"Fatibene",
"L.",
""
],
[
"Ferraris",
"M.",
""
],
[
"Francaviglia",
"M.",
""
]
] | We shall here propose a class of relativistic theories of gravitation, based on a foundational paper of Ehlers Pirani and Schild (EPS).All "extended theories of gravitation" (also known as f(R) theories) in Palatini formalism are shown to belong to this class. In a forthcoming paper we shall show that this class of the... |
1302.0040 | Benjamin C. Harms | Peter L. Biermann and Benjamin C. Harms | A Comprehensive Model of Dark Energy, Inflation AND Black Holes | 5 pages, contributed talk given at the 13th Marcel Grossmann Meeting,
July 2012 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive two new equations of quantum gravity and combine them with
reinterpretations of previously proposed concepts of dark energy, black holes,
inflation, the arrow of time and the energy at which rest-mass first manifests
itself into a theory which may be a first step toward a comprehensive
description of all th... | [
{
"created": "Thu, 31 Jan 2013 23:56:14 GMT",
"version": "v1"
}
] | 2013-02-04 | [
[
"Biermann",
"Peter L.",
""
],
[
"Harms",
"Benjamin C.",
""
]
] | We derive two new equations of quantum gravity and combine them with reinterpretations of previously proposed concepts of dark energy, black holes, inflation, the arrow of time and the energy at which rest-mass first manifests itself into a theory which may be a first step toward a comprehensive description of all thes... |
1309.2611 | Grant Remmen | Grant N. Remmen and Sean M. Carroll | Attractor Solutions in Scalar-Field Cosmology | 14 pages, 4 figures | Phys. Rev. D 88, 083518 (2013) | 10.1103/PhysRevD.88.083518 | CALT-68-2853 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Models of cosmological scalar fields often feature "attractor solutions" to
which the system evolves for a wide range of initial conditions. There is some
tension between this well-known fact and another well-known fact: Liouville's
theorem forbids true attractor behavior in a Hamiltonian system. In universes
with va... | [
{
"created": "Tue, 10 Sep 2013 18:57:42 GMT",
"version": "v1"
}
] | 2013-10-30 | [
[
"Remmen",
"Grant N.",
""
],
[
"Carroll",
"Sean M.",
""
]
] | Models of cosmological scalar fields often feature "attractor solutions" to which the system evolves for a wide range of initial conditions. There is some tension between this well-known fact and another well-known fact: Liouville's theorem forbids true attractor behavior in a Hamiltonian system. In universes with vani... |
2111.12563 | Adrian Boitier | Adrian Bo\^itier, Tanguy Giroud, Shubhanshu Tiwari, Philippe Jetzer | Series expansion of the overlap reduction function for scalar and vector
polarizations for gravitational wave search with pulsar timing arrays | null | null | 10.1103/PhysRevD.105.084006 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In our previous work \cite{PTA2} we calculated the overlap reduction function
for the tensor polarization without employing the short wavelength
approximation, this was done by obtaining a power series of nested sums which
is valid for all gravitational wave frequencies and pulsar distances. In this
work we generaliz... | [
{
"created": "Wed, 24 Nov 2021 15:35:39 GMT",
"version": "v1"
}
] | 2022-04-20 | [
[
"Boîtier",
"Adrian",
""
],
[
"Giroud",
"Tanguy",
""
],
[
"Tiwari",
"Shubhanshu",
""
],
[
"Jetzer",
"Philippe",
""
]
] | In our previous work \cite{PTA2} we calculated the overlap reduction function for the tensor polarization without employing the short wavelength approximation, this was done by obtaining a power series of nested sums which is valid for all gravitational wave frequencies and pulsar distances. In this work we generalize ... |
1803.07171 | Salvatore Capozziello | Habib Abedi, Salvatore Capozziello, Rocco D'Agostino, and Orlando
Luongo | Effective gravitational coupling in modified teleparallel theories | 17 pages, 4 figures, accepted for publication in Physical Review D | null | 10.1103/PhysRevD.97.084008 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present study, we consider an extended form of teleparallel Lagrangian
$f(T,\phi,X)$, as function of a scalar field $\phi$, its kinetic term $X$ and
the torsion scalar $T$. We use linear perturbations to obtain the equation of
matter density perturbations on sub-Hubble scales. The gravitational coupling
is mod... | [
{
"created": "Mon, 19 Mar 2018 21:31:34 GMT",
"version": "v1"
}
] | 2018-05-09 | [
[
"Abedi",
"Habib",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"D'Agostino",
"Rocco",
""
],
[
"Luongo",
"Orlando",
""
]
] | In the present study, we consider an extended form of teleparallel Lagrangian $f(T,\phi,X)$, as function of a scalar field $\phi$, its kinetic term $X$ and the torsion scalar $T$. We use linear perturbations to obtain the equation of matter density perturbations on sub-Hubble scales. The gravitational coupling is modif... |
gr-qc/0604066 | Kartheek Solipuram | Kartheek R Solipuram | Mathematical Analyses of an accelerating (Griffiths-Podolsky) Black Hole | 21 pages | null | null | null | gr-qc | null | An exact solution of Einsteins equations which represents a pair of
accelerating and rotating black holes was presented by J. B. Griffiths and J.
Podolsky [2]. In the paper [2] they have shown the explicit form of a spinning
C-metric starting from the Plebanski-Demianski metric, and transformed it using
NUT and angul... | [
{
"created": "Sat, 15 Apr 2006 18:50:56 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Oct 2006 13:29:54 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Solipuram",
"Kartheek R",
""
]
] | An exact solution of Einsteins equations which represents a pair of accelerating and rotating black holes was presented by J. B. Griffiths and J. Podolsky [2]. In the paper [2] they have shown the explicit form of a spinning C-metric starting from the Plebanski-Demianski metric, and transformed it using NUT and angular... |
2106.13837 | Shauvik Biswas | Shauvik Biswas | Massive Scalar Perturbation of Extremal Rotating Braneworld Black hole:
Superradiant Stability Analysis | 16 pages , 4 figures | Phys.Lett.B 820 (2021) 136597 | 10.1016/j.physletb.2021.136597 | null | gr-qc | http://creativecommons.org/licenses/by-sa/4.0/ | We analyse the superradiant stability of braneworld extremal Kerr and
Kerr-Newman black holes under massive scalar perturbation. These black hole
solutions differ from their four dimensional counterpart by the presence of a
tidal charge, which unlike electric charge, can take both positive and negative
values and car... | [
{
"created": "Fri, 25 Jun 2021 18:27:30 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Sep 2021 11:00:02 GMT",
"version": "v2"
}
] | 2021-09-02 | [
[
"Biswas",
"Shauvik",
""
]
] | We analyse the superradiant stability of braneworld extremal Kerr and Kerr-Newman black holes under massive scalar perturbation. These black hole solutions differ from their four dimensional counterpart by the presence of a tidal charge, which unlike electric charge, can take both positive and negative values and carri... |
gr-qc/0703002 | Kirill Krasnov | Kirill Krasnov | Non-Metric Gravity I: Field Equations | 21 pages, no figures (v2) energy conservation equation simplified,
note on reality conditions added (v3) minor changes | Class.Quant.Grav.25:025001,2008 | 10.1088/0264-9381/25/2/025001 | null | gr-qc astro-ph hep-th | null | We describe and study a certain class of modified gravity theories. Our
starting point is Plebanski formulation of gravity in terms of a triple B^i of
2-forms, a connection A^i and a ``Lagrange multiplier'' field Psi^ij. The
generalization we consider stems from presence in the action of an extra term
proportional to... | [
{
"created": "Thu, 1 Mar 2007 02:39:28 GMT",
"version": "v1"
},
{
"created": "Tue, 15 May 2007 03:01:08 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Oct 2007 11:19:56 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Krasnov",
"Kirill",
""
]
] | We describe and study a certain class of modified gravity theories. Our starting point is Plebanski formulation of gravity in terms of a triple B^i of 2-forms, a connection A^i and a ``Lagrange multiplier'' field Psi^ij. The generalization we consider stems from presence in the action of an extra term proportional to a... |
1007.1563 | Chopin Soo | Chopin Soo, Jinsong Yang and Hoi-Lai Yu | New formulation of Horava-Lifshitz quantum gravity as a master
constraint theory | 4 pages | Phys.Lett.B701:275-278,2011 | 10.1016/j.physletb.2011.05.055 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Both projectable and non-projectable versions of Horava-Lifshitz gravity face
serious challenges. In the non-projectable version, the constraint algebra is
seemingly inconsistent. The projectable version lacks a local Hamiltonian
constraint, thus allowing for an extra scalar mode which can be problematic. A
new formu... | [
{
"created": "Fri, 9 Jul 2010 11:25:18 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jun 2011 07:46:06 GMT",
"version": "v2"
}
] | 2011-06-28 | [
[
"Soo",
"Chopin",
""
],
[
"Yang",
"Jinsong",
""
],
[
"Yu",
"Hoi-Lai",
""
]
] | Both projectable and non-projectable versions of Horava-Lifshitz gravity face serious challenges. In the non-projectable version, the constraint algebra is seemingly inconsistent. The projectable version lacks a local Hamiltonian constraint, thus allowing for an extra scalar mode which can be problematic. A new formula... |
1702.07710 | Hermano Velten | Hermano Velten and Thiago R. P. Caram\^es | Cosmological inviability of $f(R,T)$ gravity | 10 pages. Version accepted for publication in PRD | Phys. Rev. D 95, 123536 (2017) | 10.1103/PhysRevD.95.123536 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Among many alternative gravitational theories to General Relativity (GR),
$f(R,T)$ gravity (where $R$ is the Ricci scalar and $T$ the trace of the
energy-momentum tensor) has been widely studied recently. By adding a matter
contribution to the gravitational Lagrangian, $f(R,T)$ theories have become an
interesting ext... | [
{
"created": "Fri, 24 Feb 2017 00:59:02 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jun 2017 16:43:03 GMT",
"version": "v2"
}
] | 2017-07-05 | [
[
"Velten",
"Hermano",
""
],
[
"Caramês",
"Thiago R. P.",
""
]
] | Among many alternative gravitational theories to General Relativity (GR), $f(R,T)$ gravity (where $R$ is the Ricci scalar and $T$ the trace of the energy-momentum tensor) has been widely studied recently. By adding a matter contribution to the gravitational Lagrangian, $f(R,T)$ theories have become an interesting exten... |
gr-qc/0212057 | P. Mitra | Tanwi Ghosh and P. Mitra | Asymptotically non-flat rotating dilaton black holes | LaTeX, 8 pages, slightly modified version to appear in Classical and
Quantum Gravity (http://www.iop.org) | Class.Quant.Grav. 20 (2003) 1403-1410 | 10.1088/0264-9381/20/7/311 | SINP/TNP/02-27 | gr-qc hep-th | null | Dilaton black hole solutions which are neither asymptotically flat nor
(anti)-de Sitter but reduce to asymptotically flat solutions in some special
limits have been known for a Liouville type dilatonic potential. It is shown
how, by solving a pair of coupled differential equations, infinitesimally small
angular momen... | [
{
"created": "Thu, 12 Dec 2002 12:24:23 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Mar 2003 06:52:20 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Ghosh",
"Tanwi",
""
],
[
"Mitra",
"P.",
""
]
] | Dilaton black hole solutions which are neither asymptotically flat nor (anti)-de Sitter but reduce to asymptotically flat solutions in some special limits have been known for a Liouville type dilatonic potential. It is shown how, by solving a pair of coupled differential equations, infinitesimally small angular momentu... |
gr-qc/0307037 | James E. Lidsey | James E. Lidsey | Cosmic Dynamics of Bose-Einstein Condensates | 12 pages, no figures. Extended discussion. In Press, Classical and
Quantum Gravity | Class.Quant.Grav. 21 (2004) 777-786 | 10.1088/0264-9381/21/4/002 | null | gr-qc astro-ph cond-mat | null | A dynamical correspondence is established between positively curved,
isotropic, perfect fluid cosmologies and quasi-two-dimensional, harmonically
trapped Bose-Einstein condensates by mapping the equations of motion for both
systems onto the one-dimensional Ermakov system. Parameters that characterize
the physical pro... | [
{
"created": "Wed, 9 Jul 2003 10:24:08 GMT",
"version": "v1"
},
{
"created": "Fri, 5 Dec 2003 15:24:13 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Lidsey",
"James E.",
""
]
] | A dynamical correspondence is established between positively curved, isotropic, perfect fluid cosmologies and quasi-two-dimensional, harmonically trapped Bose-Einstein condensates by mapping the equations of motion for both systems onto the one-dimensional Ermakov system. Parameters that characterize the physical prope... |
0804.3921 | Alberto Saa | Mauricio Richartz and Alberto Saa | Overspinning a nearly extreme black hole and the Weak Cosmic Censorship
conjecture | 4 pages. Final version to appear in PRD as a Rapid Communication | Phys.Rev.D78:081503,2008 | 10.1103/PhysRevD.78.081503 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit here the recent proposal for overspinning a nearly extreme black
hole by means of a quantum tunneling process. We show that electrically neutral
massless fermions evade possible back reactions effects related to
superradiance, confirming the view that it would be indeed possible to form a
naked singularity... | [
{
"created": "Thu, 24 Apr 2008 13:21:40 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Oct 2008 23:01:14 GMT",
"version": "v2"
}
] | 2008-11-07 | [
[
"Richartz",
"Mauricio",
""
],
[
"Saa",
"Alberto",
""
]
] | We revisit here the recent proposal for overspinning a nearly extreme black hole by means of a quantum tunneling process. We show that electrically neutral massless fermions evade possible back reactions effects related to superradiance, confirming the view that it would be indeed possible to form a naked singularity d... |
2202.00051 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | Accounting for exotic matter and the extreme radial tension in
Morris-Thorne wormholes of embedding class one | 8 pages, no figures | Eur. Phys. J. C, vol. 81, 778 (2021) | 10.1140/epjc/s10052-021-09492-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The embedding of a curved spacetime in a higher-dimensional flat spacetime
has continued to be a topic of interest in the general theory of relativity, as
exemplified by the induced-matter theory. This paper deals with spacetimes of
embedding class one, i.e., spacetimes that can be embedded in a
five-dimensional flat... | [
{
"created": "Mon, 31 Jan 2022 19:24:02 GMT",
"version": "v1"
}
] | 2022-02-09 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | The embedding of a curved spacetime in a higher-dimensional flat spacetime has continued to be a topic of interest in the general theory of relativity, as exemplified by the induced-matter theory. This paper deals with spacetimes of embedding class one, i.e., spacetimes that can be embedded in a five-dimensional flat s... |
gr-qc/9604011 | null | C. Bertoni, F. Finelli, G. Venturi | The Born-Oppenheimer Approach to the Matter-Gravity System and Unitarity | Latex, 12 pages. Revised version as accepted for publication by
Class. and Quant. Grav. Some points explained and misprints corrected | Class.Quant.Grav.13:2375-2384,1996 | 10.1088/0264-9381/13/9/005 | null | gr-qc | null | The Born-Oppenheimer approach to the matter-gravity system is illustrated and
the unitary evolution for matter, in the absence of phenomena such as
tunnelling or other instabilities, verified. The Born-Oppenheimer approach to
the matter-gravity system is illustrated in a simple minisuperspace model and
the correction... | [
{
"created": "Thu, 4 Apr 1996 13:24:35 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Jul 1996 09:12:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bertoni",
"C.",
""
],
[
"Finelli",
"F.",
""
],
[
"Venturi",
"G.",
""
]
] | The Born-Oppenheimer approach to the matter-gravity system is illustrated and the unitary evolution for matter, in the absence of phenomena such as tunnelling or other instabilities, verified. The Born-Oppenheimer approach to the matter-gravity system is illustrated in a simple minisuperspace model and the corrections ... |
gr-qc/0611144 | Robert Mann | P.S. Farrugia, R.B. Mann and T.C. Scott | N-body Gravity and the Schroedinger Equation | 15 pages, Latex, references added, typos corrected, final version
that appears in CQG | Class.Quant.Grav.24:4647-4660,2007 | 10.1088/0264-9381/24/18/006 | null | gr-qc | null | We consider the problem of the motion of $N$ bodies in a self-gravitating
system in two spacetime dimensions. We point out that this system can be mapped
onto the quantum-mechanical problem of an N-body generalization of the problem
of the H$_{2}^{+}$ molecular ion in one dimension. The canonical gravitational
N-body... | [
{
"created": "Mon, 27 Nov 2006 20:56:33 GMT",
"version": "v1"
},
{
"created": "Thu, 6 Sep 2007 15:31:23 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Farrugia",
"P. S.",
""
],
[
"Mann",
"R. B.",
""
],
[
"Scott",
"T. C.",
""
]
] | We consider the problem of the motion of $N$ bodies in a self-gravitating system in two spacetime dimensions. We point out that this system can be mapped onto the quantum-mechanical problem of an N-body generalization of the problem of the H$_{2}^{+}$ molecular ion in one dimension. The canonical gravitational N-body f... |
2211.13233 | Zhe Feng | Zhe Feng | Slow-roll inflation in $f\left(R, T, R_{ab}T^{ab}\right)$ gravity | 14 pages, 1 figure | null | 10.1142/S0217732324500263 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | In the framework of $f\left(R, T, R_{ab}T^{ab}\right)$ gravity theory, the
slow-roll approximation of the cosmic inflation is investigated, where $T$ is
the trace of the energy-momentum tensor $T^{ab}$, $R$ and $R_{ab}$ are the
Ricci scalar and tensor, respectively. After obtaining the equations of motion
of the grav... | [
{
"created": "Wed, 23 Nov 2022 07:32:05 GMT",
"version": "v1"
}
] | 2024-03-18 | [
[
"Feng",
"Zhe",
""
]
] | In the framework of $f\left(R, T, R_{ab}T^{ab}\right)$ gravity theory, the slow-roll approximation of the cosmic inflation is investigated, where $T$ is the trace of the energy-momentum tensor $T^{ab}$, $R$ and $R_{ab}$ are the Ricci scalar and tensor, respectively. After obtaining the equations of motion of the gravit... |
gr-qc/9706024 | David Langlois | David Langlois | Cosmological CMBR dipole in open universes ? | 26 pages, Latex, 6 figures, to appear in Phys. Rev. D | null | 10.1103/PhysRevD.55.7389 | 97009, Observatoire de Paris | gr-qc astro-ph | null | The observed CMBR dipole is generally interpreted as a Doppler effect arising
from the motion of the Earth relative to the CMBR frame. An alternative
interpretation, proposed in the last years, is that the dipole results from
ultra-large scale isocurvature perturbations. We examine this idea in the
context of open co... | [
{
"created": "Tue, 10 Jun 1997 21:27:36 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Langlois",
"David",
""
]
] | The observed CMBR dipole is generally interpreted as a Doppler effect arising from the motion of the Earth relative to the CMBR frame. An alternative interpretation, proposed in the last years, is that the dipole results from ultra-large scale isocurvature perturbations. We examine this idea in the context of open cosm... |
1601.00631 | Salvatore Capozziello | S. Capozziello, O. Luongo, M. Paolella | Bounding $f(R)$ gravity by particle production rate | 10 pages, 3 figures, to appear in Int. Jou. Mod. Phys. D | null | 10.1142/S021827181630010X | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Several models of $f(R)$ gravity have been proposed in order to address the
dark side problem in cosmology. However, these models should be constrained
also at ultraviolet scales in order to achieve some correct fundamental
interpretation. Here we analyze this possibility comparing quantum vacuum
states in given $f(R... | [
{
"created": "Mon, 4 Jan 2016 20:31:48 GMT",
"version": "v1"
},
{
"created": "Fri, 8 Jan 2016 08:21:03 GMT",
"version": "v2"
}
] | 2016-03-23 | [
[
"Capozziello",
"S.",
""
],
[
"Luongo",
"O.",
""
],
[
"Paolella",
"M.",
""
]
] | Several models of $f(R)$ gravity have been proposed in order to address the dark side problem in cosmology. However, these models should be constrained also at ultraviolet scales in order to achieve some correct fundamental interpretation. Here we analyze this possibility comparing quantum vacuum states in given $f(R)$... |
2403.17186 | Stefano Schmidt | Stefano Schmidt, Sarah Caudill, Jolien D. E. Creighton, Ryan Magee,
Leo Tsukada, Shomik Adhicary, Pratyusava Baral, Amanda Baylor, Kipp Cannon,
Bryce Cousins, Becca Ewing, Heather Fong, Richard N. George, Patrick Godwin,
Chad Hanna, Reiko Harada, Yun-Jing Huang, Rachael Huxford, Prathamesh Joshi,
James Kenningt... | Searching for gravitational-wave signals from precessing black hole
binaries with the GstLAL pipeline | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Precession in Binary Black Holes (BBH) is caused by the failure of the Black
Hole spins to be aligned and its study can open up new perspectives in
gravitational waves (GW) astronomy, providing, among other advancements, a
precise measure of distance and an accurate characterization of the BBH spins.
However, detecti... | [
{
"created": "Mon, 25 Mar 2024 20:55:13 GMT",
"version": "v1"
},
{
"created": "Fri, 28 Jun 2024 08:31:23 GMT",
"version": "v2"
}
] | 2024-07-01 | [
[
"Schmidt",
"Stefano",
""
],
[
"Caudill",
"Sarah",
""
],
[
"Creighton",
"Jolien D. E.",
""
],
[
"Magee",
"Ryan",
""
],
[
"Tsukada",
"Leo",
""
],
[
"Adhicary",
"Shomik",
""
],
[
"Baral",
"Pratyusava",
""
],... | Precession in Binary Black Holes (BBH) is caused by the failure of the Black Hole spins to be aligned and its study can open up new perspectives in gravitational waves (GW) astronomy, providing, among other advancements, a precise measure of distance and an accurate characterization of the BBH spins. However, detecting... |
1501.07781 | Ott Vilson | Laur Jarv, Piret Kuusk, Margus Saal and Ott Vilson | Parametrizations in scalar-tensor theories of gravity and the limit of
general relativity | 14 pages | J. Phys. Conf. Ser. 532, 012011 (2014) | 10.1088/1742-6596/532/1/012011 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a general scalar-tensor theory of gravity and review briefly
different forms it can be presented (different conformal frames and scalar
field parametrizations). We investigate the conditions under which its field
equations and the parametrized post-Newtonian parameters coincide with those of
general relat... | [
{
"created": "Fri, 30 Jan 2015 14:13:17 GMT",
"version": "v1"
}
] | 2015-02-02 | [
[
"Jarv",
"Laur",
""
],
[
"Kuusk",
"Piret",
""
],
[
"Saal",
"Margus",
""
],
[
"Vilson",
"Ott",
""
]
] | We consider a general scalar-tensor theory of gravity and review briefly different forms it can be presented (different conformal frames and scalar field parametrizations). We investigate the conditions under which its field equations and the parametrized post-Newtonian parameters coincide with those of general relativ... |
1608.05948 | Oldrich Semerak | O. Semer\'ak and M. Basovn\'ik | On geometry of deformed black holes: I. Majumdar-Papapetrou binary | 18 pages, 9 figures | Physical Review D 94, 044006 (2016) | 10.1103/PhysRevD.94.044006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Although black holes are eminent manifestations of very strong gravity, the
geometry of space-time around and even inside them can be significantly
affected by additional bodies present in their surroundings. We study such an
influence within static and axially symmetric (electro-)vacuum space-times
described by exac... | [
{
"created": "Sun, 21 Aug 2016 14:37:11 GMT",
"version": "v1"
}
] | 2016-08-23 | [
[
"Semerák",
"O.",
""
],
[
"Basovník",
"M.",
""
]
] | Although black holes are eminent manifestations of very strong gravity, the geometry of space-time around and even inside them can be significantly affected by additional bodies present in their surroundings. We study such an influence within static and axially symmetric (electro-)vacuum space-times described by exact ... |
2202.03230 | Jose M. Isidro | J.C. Castro-Palacio, P. Fernandez de Cordoba, R. Gallego Torrome and
J.M. Isidro | Hyperbolic space in the Newtonian limit: the cosmological constant | 12 pp; refs. added | null | 10.1142/S0218271822500729 | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | The cosmological constant and the Boltzmann entropy of a Newtonian Universe
filled with a perfect fluid are computed, under the assumption that spatial
sections are copies of 3-dimensional hyperbolic space.
| [
{
"created": "Mon, 7 Feb 2022 14:35:22 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Feb 2022 12:20:52 GMT",
"version": "v2"
}
] | 2022-09-07 | [
[
"Castro-Palacio",
"J. C.",
""
],
[
"de Cordoba",
"P. Fernandez",
""
],
[
"Torrome",
"R. Gallego",
""
],
[
"Isidro",
"J. M.",
""
]
] | The cosmological constant and the Boltzmann entropy of a Newtonian Universe filled with a perfect fluid are computed, under the assumption that spatial sections are copies of 3-dimensional hyperbolic space. |
0809.1250 | Slava G. Turyshev | Slava G. Turyshev | Relativistic gravitational deflection of light and its impact on the
modeling accuracy for the Space Interferometry Mission | revtex4, 20 pages, 9 figures, 13 tables | Astron.Lett.35:215-234,2009 | 10.1134/S106377370904001X | null | gr-qc | http://creativecommons.org/licenses/publicdomain/ | We study the impact of relativistic gravitational deflection of light on the
accuracy of future Space Interferometry Mission (SIM). We estimate the
deflection angles caused by the monopole, quadrupole and octupole components of
gravitational fields for a number of celestial bodies in the solar system. We
observe that... | [
{
"created": "Sun, 7 Sep 2008 20:50:51 GMT",
"version": "v1"
}
] | 2009-07-24 | [
[
"Turyshev",
"Slava G.",
""
]
] | We study the impact of relativistic gravitational deflection of light on the accuracy of future Space Interferometry Mission (SIM). We estimate the deflection angles caused by the monopole, quadrupole and octupole components of gravitational fields for a number of celestial bodies in the solar system. We observe that, ... |
gr-qc/0507049 | Gamal Nashed G.L. | Gamal G.L. Nashed | Energy distribution of Kerr spacetime using Moller energy momentum
complex | 8 pages, Latex | Nuovo Cim. B119 (2004) 967 | 10.1393/ncb/i2004-10132-8 | null | gr-qc | null | Using the energy momentum complex given by M{\o}ller in 1978 based on the
absolute parallelism, the energy distribution in Kerr spacetime is evaluated.
The energy with this spacetime is found to be the same as it was earlier
evaluated using different definitions mainly based on the metric tensor.
| [
{
"created": "Tue, 12 Jul 2005 09:25:29 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Nashed",
"Gamal G. L.",
""
]
] | Using the energy momentum complex given by M{\o}ller in 1978 based on the absolute parallelism, the energy distribution in Kerr spacetime is evaluated. The energy with this spacetime is found to be the same as it was earlier evaluated using different definitions mainly based on the metric tensor. |
1912.11909 | Naveena Kumara A | A. Naveena Kumara, C.L. Ahmed Rizwan, Shreyas Punacha, Ajith K.M. and
Md Sabir Ali | Photon Orbits and Thermodynamic Phase Transition of Regular AdS Black
Holes | Thoroughly revised. 12 pages, 11 figures | Phys. Rev. D 102, 084059 (2020) | 10.1103/PhysRevD.102.084059 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We probe the phase structure of the regular AdS black holes using the null
geodesics. The radius of photon orbit and minimum impact parameter shows a
non-monotonous behaviour below the critical values of the temperature and the
pressure, corresponding to the phase transition in extended phase space. The
respective di... | [
{
"created": "Thu, 26 Dec 2019 18:15:12 GMT",
"version": "v1"
},
{
"created": "Thu, 17 Sep 2020 06:47:59 GMT",
"version": "v2"
}
] | 2020-11-04 | [
[
"Kumara",
"A. Naveena",
""
],
[
"Rizwan",
"C. L. Ahmed",
""
],
[
"Punacha",
"Shreyas",
""
],
[
"M.",
"Ajith K.",
""
],
[
"Ali",
"Md Sabir",
""
]
] | We probe the phase structure of the regular AdS black holes using the null geodesics. The radius of photon orbit and minimum impact parameter shows a non-monotonous behaviour below the critical values of the temperature and the pressure, corresponding to the phase transition in extended phase space. The respective diff... |
gr-qc/0101071 | Kimberly C. B. New | Kimberly C. B. New and Joan M. Centrella | Rotational Instabilities and Centrifugal Hangup | 13 pages (includes 11 figures) and 1 separate jpeg figure; to appear
in Astrophysical Sources of Gravitational Radiation, AIP conference
proceedings, edited by Joan M. Centrella | null | 10.1063/1.1387314 | LA-UR-00-5924 | gr-qc astro-ph | null | One interesting class of gravitational radiation sources includes rapidly
rotating astrophysical objects that encounter dynamical instabilities. We have
carried out a set of simulations of rotationally induced instabilities in
differentially rotating polytropes. An $n$=1.5 polytrope with the Maclaurin
rotation law wi... | [
{
"created": "Wed, 17 Jan 2001 21:39:37 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"New",
"Kimberly C. B.",
""
],
[
"Centrella",
"Joan M.",
""
]
] | One interesting class of gravitational radiation sources includes rapidly rotating astrophysical objects that encounter dynamical instabilities. We have carried out a set of simulations of rotationally induced instabilities in differentially rotating polytropes. An $n$=1.5 polytrope with the Maclaurin rotation law will... |
1708.05570 | D\'aniel Barta | D\'aniel Barta | Relativistic model for cold spherical interstellar gas clouds | null | AN 334, 9, 916-919 (2013) | 10.1002/asna.201211958 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate insterstellar gas spheres by determining the metric functions,
the material distribution, and the features of particle orbits in terms of
stability and geodesics. An exact solution of the Einstein's equations for
interstellar gas clouds is derived that is compatible with the results of
recent astronomi... | [
{
"created": "Fri, 18 Aug 2017 11:54:03 GMT",
"version": "v1"
}
] | 2017-08-21 | [
[
"Barta",
"Dániel",
""
]
] | We investigate insterstellar gas spheres by determining the metric functions, the material distribution, and the features of particle orbits in terms of stability and geodesics. An exact solution of the Einstein's equations for interstellar gas clouds is derived that is compatible with the results of recent astronomica... |
2302.09284 | Ettore Minguzzi | E. Minguzzi | Further observations on the definition of global hyperbolicity under low
regularity | Latex, 11 pages | Class. Quantum Grav. 40 (2023) 185001 | 10.1088/1361-6382/acdd40 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The definitions of global hyperbolicity for closed cone structures and
topological preordered spaces are known to coincide. In this work we clarify
the connection with definitions of global hyperbolicity proposed in recent
literature on Lorentzian length spaces and Lorentzian optimal transport,
suggesting possible co... | [
{
"created": "Sat, 18 Feb 2023 10:42:16 GMT",
"version": "v1"
}
] | 2023-08-10 | [
[
"Minguzzi",
"E.",
""
]
] | The definitions of global hyperbolicity for closed cone structures and topological preordered spaces are known to coincide. In this work we clarify the connection with definitions of global hyperbolicity proposed in recent literature on Lorentzian length spaces and Lorentzian optimal transport, suggesting possible corr... |
2408.08139 | Shu Luo | Shu Luo | The quasinormal modes, pseudospectrum and time evolution of Proca fields
in qOS-dS spacetime | 19 pages, 35 figures. arXiv admin note: text overlap with
arXiv:2401.09907 by other authors | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this study, we investigate the quasinormal modes, pseudospectrum and time
evolution of a massive vector field around a quantum corrected black hole in
de-Sitter spacetime. We start by parameterization and using orthonormal tetrads
to get the effective potential. Methodologically we use the hyperboloidal
framework ... | [
{
"created": "Thu, 15 Aug 2024 13:14:28 GMT",
"version": "v1"
}
] | 2024-08-16 | [
[
"Luo",
"Shu",
""
]
] | In this study, we investigate the quasinormal modes, pseudospectrum and time evolution of a massive vector field around a quantum corrected black hole in de-Sitter spacetime. We start by parameterization and using orthonormal tetrads to get the effective potential. Methodologically we use the hyperboloidal framework to... |
2301.06124 | Yang Zhang | Xuan Ye and Yang Zhang | Maxwell field with gauge fixing term in the radiation- and
matter-dominant stages: exact solution and stress tensor | 18 pages, add references, submitted, | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Maxwell field with a general gauge fixing (GF) term in the
radiation-dominant (RD) and matter-dominant (MD) stages of expanding Universe,
as a continuation to the previous work in de Sitter space. We derive the exact
solutions, perform the covariant canonical quantization and obtain the stress
tensor in ... | [
{
"created": "Sun, 15 Jan 2023 15:44:11 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Jan 2023 15:49:05 GMT",
"version": "v2"
}
] | 2023-01-23 | [
[
"Ye",
"Xuan",
""
],
[
"Zhang",
"Yang",
""
]
] | We study the Maxwell field with a general gauge fixing (GF) term in the radiation-dominant (RD) and matter-dominant (MD) stages of expanding Universe, as a continuation to the previous work in de Sitter space. We derive the exact solutions, perform the covariant canonical quantization and obtain the stress tensor in th... |
2205.11629 | Miguel Sabido | A. Mart\'inez-Merino and M. Sabido | Cosmology and Non-additive Entropy | & pages, no figures | null | 10.1142/S021827182250136X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-additive entropies have been proposed as alternatives to understanding
the thermodynamics of Black Holes. Moreover, it has been suggested that the
difficulties of quantization of gravity are an indication that gravity is an
emergent phenomenon, and therefore an entropic formulation is warranted. In
this work, we ... | [
{
"created": "Mon, 23 May 2022 20:57:27 GMT",
"version": "v1"
}
] | 2023-02-22 | [
[
"Martínez-Merino",
"A.",
""
],
[
"Sabido",
"M.",
""
]
] | Non-additive entropies have been proposed as alternatives to understanding the thermodynamics of Black Holes. Moreover, it has been suggested that the difficulties of quantization of gravity are an indication that gravity is an emergent phenomenon, and therefore an entropic formulation is warranted. In this work, we ex... |
2303.07661 | Guillem Dom\`enech | Guillem Dom\`enech and Misao Sasaki | Gravitational wave hints black hole remnants as dark matter | Note on the primordial black hole remnant scenario. 3 figures | null | 10.1088/1361-6382/ace493 | YITP-23-30 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The end state of Hawking evaporation of a black hole is uncertain. Some
candidate quantum gravity theories, such as loop quantum gravity and asymptotic
safe gravity, hint towards Planck sized remnants. If so, the Universe might be
filled with remnants of tiny primordial black holes, which formed with mass
$M<10^9\,{\... | [
{
"created": "Tue, 14 Mar 2023 07:06:07 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Domènech",
"Guillem",
""
],
[
"Sasaki",
"Misao",
""
]
] | The end state of Hawking evaporation of a black hole is uncertain. Some candidate quantum gravity theories, such as loop quantum gravity and asymptotic safe gravity, hint towards Planck sized remnants. If so, the Universe might be filled with remnants of tiny primordial black holes, which formed with mass $M<10^9\,{\rm... |
2403.18740 | Swarnim Shirke | Swarnim Shirke, Bikram Keshari Pradhan, Debarati Chatterjee, Laura
Sagunski, J\"urgen Schaffner-Bielich | Effects of Dark Matter on $f$-mode oscillations of Neutron Stars | 24 pages, 22 figures, 5 tables | null | null | LIGO-P2400135 | gr-qc astro-ph.HE hep-ph nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this study is to investigate the effect of dark matter (DM) on
$f$-mode oscillations in DM admixed neutron stars (NSs). We consider hadronic
matter modeled by the relativistic mean field model and the DM model based on
the neutron decay anomaly. We study the non-radial $f$-mode oscillations for
such DM adm... | [
{
"created": "Wed, 27 Mar 2024 16:32:34 GMT",
"version": "v1"
}
] | 2024-04-04 | [
[
"Shirke",
"Swarnim",
""
],
[
"Pradhan",
"Bikram Keshari",
""
],
[
"Chatterjee",
"Debarati",
""
],
[
"Sagunski",
"Laura",
""
],
[
"Schaffner-Bielich",
"Jürgen",
""
]
] | The aim of this study is to investigate the effect of dark matter (DM) on $f$-mode oscillations in DM admixed neutron stars (NSs). We consider hadronic matter modeled by the relativistic mean field model and the DM model based on the neutron decay anomaly. We study the non-radial $f$-mode oscillations for such DM admix... |
2312.13954 | Ribhu Paul | Ribhu Paul, Sumanta Chakraborty | Singularity avoidance from path integral | 21 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have demonstrated that the wave functional describing the quantum nature
of the spacetime inside the black hole horizon, vanishes near the singularity,
using the path integral formalism. This is akin to the DeWitt criterion,
applied to the interior of a Schwarzschild black hole. To achieve the same we
have express... | [
{
"created": "Thu, 21 Dec 2023 15:41:10 GMT",
"version": "v1"
}
] | 2023-12-22 | [
[
"Paul",
"Ribhu",
""
],
[
"Chakraborty",
"Sumanta",
""
]
] | We have demonstrated that the wave functional describing the quantum nature of the spacetime inside the black hole horizon, vanishes near the singularity, using the path integral formalism. This is akin to the DeWitt criterion, applied to the interior of a Schwarzschild black hole. To achieve the same we have expressed... |
1209.4698 | Myungseok Eune | Myungseok Eune, Bogeun Gwak, Wontae Kim | Local thermodynamics of KS black hole | 12 pages, 5 figures, final version, To be published in Physics
Letters B | Phys. Lett. B 718 (2013) 1505-1509 | 10.1016/j.physletb.2012.12.018 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the thermodynamics of the KS black hole which is an asymptotically
flat solution of the HL gravity. In particular, we introduce a cavity to
describe the thermodynamics at a finite isothermal surface on general ground
and to get a well-defined thermodynamics. We show that there exists a locally
stable small b... | [
{
"created": "Fri, 21 Sep 2012 04:07:51 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Dec 2012 05:05:38 GMT",
"version": "v2"
}
] | 2013-01-18 | [
[
"Eune",
"Myungseok",
""
],
[
"Gwak",
"Bogeun",
""
],
[
"Kim",
"Wontae",
""
]
] | We study the thermodynamics of the KS black hole which is an asymptotically flat solution of the HL gravity. In particular, we introduce a cavity to describe the thermodynamics at a finite isothermal surface on general ground and to get a well-defined thermodynamics. We show that there exists a locally stable small bla... |
gr-qc/9605037 | Robin W. Tucker | J Schray, T Dray, C A Manogue, R W Tucker, C Wang | The Construction of Spinor Fields on Manifolds with Smooth Degenerate
Metrics | 24 pages, LaTeX (RevTeX 3.0, no figures), To appear in J. Math. Phys | J.Math.Phys. 37 (1996) 3882-3896 | 10.1063/1.531607 | null | gr-qc | null | We examine some of the subtleties inherent in formulating a theory of spinors
on a manifold with a smooth degenerate metric. We concentrate on the case where
the metric is singular on a hypersurface that partitions the manifold into
Lorentzian and Euclidean domains. We introduce the notion of a complex spinor
fibrati... | [
{
"created": "Fri, 17 May 1996 13:17:30 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Schray",
"J",
""
],
[
"Dray",
"T",
""
],
[
"Manogue",
"C A",
""
],
[
"Tucker",
"R W",
""
],
[
"Wang",
"C",
""
]
] | We examine some of the subtleties inherent in formulating a theory of spinors on a manifold with a smooth degenerate metric. We concentrate on the case where the metric is singular on a hypersurface that partitions the manifold into Lorentzian and Euclidean domains. We introduce the notion of a complex spinor fibration... |
1312.4625 | Jun-Qi Guo | Jun-Qi Guo, Daoyan Wang, Andrei V. Frolov | Spherical collapse in f(R) gravity and the
Belinskii-Khalatnikov-Lifshitz conjecture | Results in the Jordan frame and for the Starobinsky model are added,
see Sections V and VI. 27 pages, 14 figures | Phys. Rev. D 90, 024017 (2014) | 10.1103/PhysRevD.90.024017 | SCG-2013-08 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spherical scalar collapse in f(R) gravity is studied numerically in
double-null coordinates in the Einstein frame. Dynamics in the vicinity of the
singularity of the formed black hole is examined via mesh refinement and
asymptotic analysis. Before the collapse, the scalar degree of freedom f' is
coupled to a physical... | [
{
"created": "Tue, 17 Dec 2013 03:32:55 GMT",
"version": "v1"
},
{
"created": "Mon, 24 Feb 2014 19:14:17 GMT",
"version": "v2"
},
{
"created": "Wed, 19 Mar 2014 22:38:27 GMT",
"version": "v3"
},
{
"created": "Mon, 14 Jul 2014 19:11:05 GMT",
"version": "v4"
}
] | 2014-07-15 | [
[
"Guo",
"Jun-Qi",
""
],
[
"Wang",
"Daoyan",
""
],
[
"Frolov",
"Andrei V.",
""
]
] | Spherical scalar collapse in f(R) gravity is studied numerically in double-null coordinates in the Einstein frame. Dynamics in the vicinity of the singularity of the formed black hole is examined via mesh refinement and asymptotic analysis. Before the collapse, the scalar degree of freedom f' is coupled to a physical s... |
gr-qc/9509029 | null | Arthur M. Aslanyan | Gauge Fields with Quasinilpotent Gauge Group | 4 pages | null | null | -95-09 | gr-qc | null | We investigate non-linear generalization of Maxwell theory of electromagnetic
field keeping the gauge invariance of Lagrangian. New theory, which is standard
Yang-Mills theory, is based on Harmonic Oscillator HO(4,R) gauge group. It's a
solvable Lie group with nilpotent normal subgroup of codimension 1. We write
down... | [
{
"created": "Mon, 18 Sep 1995 17:12:52 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Aslanyan",
"Arthur M.",
""
]
] | We investigate non-linear generalization of Maxwell theory of electromagnetic field keeping the gauge invariance of Lagrangian. New theory, which is standard Yang-Mills theory, is based on Harmonic Oscillator HO(4,R) gauge group. It's a solvable Lie group with nilpotent normal subgroup of codimension 1. We write down t... |
1209.1876 | James Kentosh | J. Kentosh and M. Mohageg | Reply to Comment on "Global positioning system test of the local
position invariance of Planck's constant" | 3 pages, no figures | Phys. Rev. Lett. 109, 068902 (2012) | 10.1103/PhysRevLett.109.068902 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reply to a Comment [Berengut and Flambaum, Phys. Rev. Lett. 109, 068901
(2012), arXiv:1203.5592] on our recent Letter [Kentosh and Mohageg, Phys. Rev.
Lett. 108, 110801 (2012), arXiv:1203.0102]. The Comment objects to our work
partly because $h$ has dimensions and therefore measuring any variation of it
is meaning... | [
{
"created": "Mon, 10 Sep 2012 03:57:38 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Kentosh",
"J.",
""
],
[
"Mohageg",
"M.",
""
]
] | We reply to a Comment [Berengut and Flambaum, Phys. Rev. Lett. 109, 068901 (2012), arXiv:1203.5592] on our recent Letter [Kentosh and Mohageg, Phys. Rev. Lett. 108, 110801 (2012), arXiv:1203.0102]. The Comment objects to our work partly because $h$ has dimensions and therefore measuring any variation of it is meaningle... |
gr-qc/0405031 | Christopher Wainwright | Chris Wainwright and Ruth M. Williams | Area Regge Calculus and Discontinuous Metrics | 18 pages, 1 figure | Class.Quant.Grav. 21 (2004) 4865-4880 | 10.1088/0264-9381/21/21/008 | DAMTP-2004-43 | gr-qc | null | Taking the triangle areas as independent variables in the theory of Regge
calculus can lead to ambiguities in the edge lengths, which can be interpreted
as discontinuities in the metric. We construct solutions to area Regge calculus
using a triangulated lattice and find that on a spacelike hypersurface no such
discon... | [
{
"created": "Thu, 6 May 2004 16:13:21 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Wainwright",
"Chris",
""
],
[
"Williams",
"Ruth M.",
""
]
] | Taking the triangle areas as independent variables in the theory of Regge calculus can lead to ambiguities in the edge lengths, which can be interpreted as discontinuities in the metric. We construct solutions to area Regge calculus using a triangulated lattice and find that on a spacelike hypersurface no such disconti... |
gr-qc/9403010 | null | Alexander Vilenkin | Approaches to Quantum Cosmology | 38 pages | Phys.Rev.D50:2581-2594,1994 | 10.1103/PhysRevD.50.2581 | null | gr-qc hep-th | null | Different proposals for the wave function of the universe are analyzed, with
an emphasis on various forms of the tunneling proposal. The issues discussed
include the equivalence of the Lorentzian path integral and outgoing-wave
proposals, the definitions of the outgoing waves and of superspace boundaries,
topology ch... | [
{
"created": "Wed, 2 Mar 1994 20:35:00 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Vilenkin",
"Alexander",
""
]
] | Different proposals for the wave function of the universe are analyzed, with an emphasis on various forms of the tunneling proposal. The issues discussed include the equivalence of the Lorentzian path integral and outgoing-wave proposals, the definitions of the outgoing waves and of superspace boundaries, topology chan... |
2102.06041 | Ayan Banerjee | Sudan Hansraj, Megandhren Govender, Ayan Banerjee and Njabulo Mkhize | All Conformally Flat Einstein--Gauss--Bonnet static Metrics | 23 pages, 9 figures, accepted for publication in Class.Quant.Grav | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is known that the standard Schwarzschild interior metric is conformally
flat and generates a constant density sphere in any spacetime dimension in
Einstein and Einstein--Gauss--Bonnet gravity. This motivates the questions: In
EGB does the conformal flatness criterion yield the Schwarzschild metric? Does
the assump... | [
{
"created": "Wed, 10 Feb 2021 09:18:40 GMT",
"version": "v1"
}
] | 2021-02-12 | [
[
"Hansraj",
"Sudan",
""
],
[
"Govender",
"Megandhren",
""
],
[
"Banerjee",
"Ayan",
""
],
[
"Mkhize",
"Njabulo",
""
]
] | It is known that the standard Schwarzschild interior metric is conformally flat and generates a constant density sphere in any spacetime dimension in Einstein and Einstein--Gauss--Bonnet gravity. This motivates the questions: In EGB does the conformal flatness criterion yield the Schwarzschild metric? Does the assumpti... |
0909.3176 | Young-Jai Park | Yong-Wan Kim, Jaedong Choi, and Young-Jai Park | Local free-fall temperature of a RN-AdS black hole | 18 pages, 11 figures, version to appear in Int. J. Mod. Phys. A | Int.J.Mod.Phys.A25:3107-3120,2010 | 10.1142/S0217751X10049311 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the global embedding Minkowski space (GEMS) geometries of a
(3+1)-dimensional curved Reissner-Nordstr\"om(RN)-AdS black hole spacetime into
a (5+2)-dimensional flat spacetime to define a proper local temperature, which
remains finite at the event horizon, for freely falling observers outside a
static black hol... | [
{
"created": "Thu, 17 Sep 2009 10:04:32 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Sep 2009 06:13:15 GMT",
"version": "v2"
},
{
"created": "Tue, 9 Mar 2010 05:41:13 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Kim",
"Yong-Wan",
""
],
[
"Choi",
"Jaedong",
""
],
[
"Park",
"Young-Jai",
""
]
] | We use the global embedding Minkowski space (GEMS) geometries of a (3+1)-dimensional curved Reissner-Nordstr\"om(RN)-AdS black hole spacetime into a (5+2)-dimensional flat spacetime to define a proper local temperature, which remains finite at the event horizon, for freely falling observers outside a static black hole.... |
gr-qc/0004030 | Jing Wang | Anupam Mazumdar and Jing Wang | A Note on Brane Inflation | 5 pages, Latex. A footnote added, new references added | Phys.Lett. B490 (2000) 251-257 | 10.1016/S0370-2693(00)00741-3 | null | gr-qc hep-ph hep-th | null | We demonstrate that there exists an inflationary solution on the positive
tension brane in the Randall-Sundrum scenario. Inflation is driven by a
slow-rolling scalar field on the brane and is achieved within the perturbative
limit of the radion field. We find that inflation on the positive tension brane
results in a ... | [
{
"created": "Mon, 10 Apr 2000 15:15:44 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Apr 2000 21:50:33 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Mazumdar",
"Anupam",
""
],
[
"Wang",
"Jing",
""
]
] | We demonstrate that there exists an inflationary solution on the positive tension brane in the Randall-Sundrum scenario. Inflation is driven by a slow-rolling scalar field on the brane and is achieved within the perturbative limit of the radion field. We find that inflation on the positive tension brane results in a sl... |
gr-qc/0101072 | Mattias Marklund | M. Bradley, G. Fodor, M. Marklund and Z. Perjes | Some results on the integrability of Einstein's field equations for
axistationary perfect fluids | 2 pages, contribution to the 9th Marcel Grossmann meeting (MG9),
Rome, July 2000 | null | 10.1142/9789812777386_0061 | null | gr-qc | null | Using an orthonormal Lorentz frame approach to axistationary perfect fluid
spacetimes, we have formulated the necessary and sufficient equations as a
first order system, and investigated the integrability conditions of this set
of equations. The integrability conditions are helpful tools when it comes to
check the co... | [
{
"created": "Wed, 17 Jan 2001 16:31:04 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Bradley",
"M.",
""
],
[
"Fodor",
"G.",
""
],
[
"Marklund",
"M.",
""
],
[
"Perjes",
"Z.",
""
]
] | Using an orthonormal Lorentz frame approach to axistationary perfect fluid spacetimes, we have formulated the necessary and sufficient equations as a first order system, and investigated the integrability conditions of this set of equations. The integrability conditions are helpful tools when it comes to check the cons... |
1011.2832 | Sushant Ghosh Prof | Sushant G. Ghosh, L. P. Singh | Gravitating magnetic monopole in Vaidya geometry | 5 RevTeX pages, no figures, minor changes, to appear in Physical
Review D | Phys.Rev.D83:067501,2011 | 10.1103/PhysRevD.83.067501 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A magnetic-monopole solution of a non-Abelian gauge theory as proposed by 't
Hooft and Polyakov is studied in the Vaidya spacetime. We find that the
solutions of Einstein equations generates a geometry of the Bonnor-Vaidya
corresponding to magnetically charged null fluid with Higgs field contributing
a cosmological t... | [
{
"created": "Fri, 12 Nov 2010 05:20:18 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Mar 2011 04:33:21 GMT",
"version": "v2"
}
] | 2011-03-22 | [
[
"Ghosh",
"Sushant G.",
""
],
[
"Singh",
"L. P.",
""
]
] | A magnetic-monopole solution of a non-Abelian gauge theory as proposed by 't Hooft and Polyakov is studied in the Vaidya spacetime. We find that the solutions of Einstein equations generates a geometry of the Bonnor-Vaidya corresponding to magnetically charged null fluid with Higgs field contributing a cosmological ter... |
2405.20240 | Khireddine Nouicer | Sihem zabat, Youcef Kehal and Khireddine Nouicer | Alleviating the $H_0$ and $\sigma_8$ tensions in the interacting cubic
covariant Galileon model | 35 pages, 7 figures, 5 tables | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The interaction between dark matter and dark energy has become a focal point
in contemporary cosmological research, particularly in addressing current
cosmological tensions. This study explores the cubic Galileon model's
interaction with dark matter, where the interaction potential in the dark
sector is proportional ... | [
{
"created": "Thu, 30 May 2024 16:44:03 GMT",
"version": "v1"
}
] | 2024-05-31 | [
[
"zabat",
"Sihem",
""
],
[
"Kehal",
"Youcef",
""
],
[
"Nouicer",
"Khireddine",
""
]
] | The interaction between dark matter and dark energy has become a focal point in contemporary cosmological research, particularly in addressing current cosmological tensions. This study explores the cubic Galileon model's interaction with dark matter, where the interaction potential in the dark sector is proportional to... |
2311.03093 | Jafar Khodagholizadeh | Jafar Khodagholizadeh | Constraints on Dark Energy from the Gravitational Wave Background | 24 pages. arXiv admin note: text overlap with arXiv:2208.06844 | Eur. Phys. J. C (2023) 83: 988 | null | null | gr-qc astro-ph.CO | http://creativecommons.org/licenses/by/4.0/ | Current observational data indicate that dark energy (DE) is a cosmological
constant without considering its conclusiveness evidence. Considering the
dynamic nature of $\Lambda$ individually as a function of time and the scale
factor, we review their effects on the gravitational waves. This article is a
continuation ... | [
{
"created": "Mon, 6 Nov 2023 13:35:46 GMT",
"version": "v1"
}
] | 2023-11-07 | [
[
"Khodagholizadeh",
"Jafar",
""
]
] | Current observational data indicate that dark energy (DE) is a cosmological constant without considering its conclusiveness evidence. Considering the dynamic nature of $\Lambda$ individually as a function of time and the scale factor, we review their effects on the gravitational waves. This article is a continuation of... |
0906.4428 | John J. Oh | John J. Oh and Chanyong Park | Gravitational Collapse of the Shells with the Smeared Gravitational
Source in Noncommutative Geometry | 16 pages, LateX, 9 figures, Title changed in this published version | JHEP 1003:086,2010 | 10.1007/JHEP03(2010)086 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the formation of the (noncommutative) Schwarzschild black hole from
collapsing shell {of the} generalized matters containing polytropic and
Chaplygin gas. We show that this collapsing shell depending on various
parameters forms either a black hole or a naked singular shell with the help of
the pressure.Furth... | [
{
"created": "Wed, 24 Jun 2009 09:03:57 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Apr 2010 06:36:03 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Oh",
"John J.",
""
],
[
"Park",
"Chanyong",
""
]
] | We study the formation of the (noncommutative) Schwarzschild black hole from collapsing shell {of the} generalized matters containing polytropic and Chaplygin gas. We show that this collapsing shell depending on various parameters forms either a black hole or a naked singular shell with the help of the pressure.Further... |
gr-qc/0302074 | Paulo M. S\' a | Paulo M. S\'a | Polytropic stars in three-dimensional spacetime | 3 pages, revtex | Phys.Lett. B467 (1999) 40 | 10.1016/S0370-2693(99)01181-8 | null | gr-qc | null | We investigate three-dimensional perfect fluid stars with polytropic equation
of state, matched to the exterior three-dimensional black hole geometry of
Banados, Teitelboim and Zanelli. A new class of exact solutions for a generic
polytropic index is found and analysed.
| [
{
"created": "Tue, 18 Feb 2003 16:03:07 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Sá",
"Paulo M.",
""
]
] | We investigate three-dimensional perfect fluid stars with polytropic equation of state, matched to the exterior three-dimensional black hole geometry of Banados, Teitelboim and Zanelli. A new class of exact solutions for a generic polytropic index is found and analysed. |
1901.07104 | Leonardo Chataignier | Leonardo Chataignier | Gauge Fixing and the Semiclassical Interpretation of Quantum Cosmology | 32+13 pages, no figures. v2: updated references, minor typos
corrected, conceptual clarifications added, published in Zeitschrift f\"ur
Naturforschung A | Z. Naturforsch. A 74 (2019) 1069 | 10.1515/zna-2019-0223 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We make a critical review of the semiclassical interpretation of quantum
cosmology and emphasise that it is not necessary to consider that a concept of
time emerges only when the gravitational field is (semi)classical. We show that
the usual results of the semiclassical interpretation, and its generalisation
known as... | [
{
"created": "Mon, 21 Jan 2019 22:29:23 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Aug 2019 00:00:14 GMT",
"version": "v2"
}
] | 2019-12-10 | [
[
"Chataignier",
"Leonardo",
""
]
] | We make a critical review of the semiclassical interpretation of quantum cosmology and emphasise that it is not necessary to consider that a concept of time emerges only when the gravitational field is (semi)classical. We show that the usual results of the semiclassical interpretation, and its generalisation known as t... |
gr-qc/0203003 | Adrian Ottewill | P.C.W. Davies and Adrian C. Ottewill | Detection of negative energy: 4-dimensional examples | 10 pages, 7 figures | Phys.Rev. D65 (2002) 104014 | 10.1103/PhysRevD.65.104014 | null | gr-qc | null | We study the response of switched particle detectors to static negative
energy densities and negative energy fluxes. It is demonstrated how the
switching leads to excitation even in the vacuum and how negative energy can
lead to a suppression of this excitation. We obtain quantum inequalities on the
detection similar... | [
{
"created": "Fri, 1 Mar 2002 12:44:14 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Davies",
"P. C. W.",
""
],
[
"Ottewill",
"Adrian C.",
""
]
] | We study the response of switched particle detectors to static negative energy densities and negative energy fluxes. It is demonstrated how the switching leads to excitation even in the vacuum and how negative energy can lead to a suppression of this excitation. We obtain quantum inequalities on the detection similar t... |
2404.02129 | David Wiltshire | David L. Wiltshire | Solution to the cosmological constant problem | 8 pages, 3 figures, Essay for the Gravity Research Foundation 2024 | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | I propose an observationally and theoretically consistent resolution of the
cosmological constant problem: $\Lambda$ is a counterterm -- with a running
coupling -- that balances the monopole celestial sky average of the kinetic
energy of expansion of inhomogeneously distributed `small' cosmic voids. No
other dark ene... | [
{
"created": "Tue, 2 Apr 2024 17:35:58 GMT",
"version": "v1"
}
] | 2024-04-03 | [
[
"Wiltshire",
"David L.",
""
]
] | I propose an observationally and theoretically consistent resolution of the cosmological constant problem: $\Lambda$ is a counterterm -- with a running coupling -- that balances the monopole celestial sky average of the kinetic energy of expansion of inhomogeneously distributed `small' cosmic voids. No other dark energ... |
2003.12291 | Rahul Kumar | Sushant G. Ghosh and Rahul Kumar | Generating black holes in $4D$ Einstein-Gauss-Bonnet gravity | 12 pages and 1 table. Minor typos corrected and accepted in Classical
Quantum Gravity | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In recent times there is a surge of interest in constructing
Einstein-Gauss-Bonnet (EGB) gravity, in the limit $D \to 4 $, of the
$D$-dimensional EGB gravity. Interestingly, the static spherically symmetric
solutions in the various proposed $D \to 4 $ regularized EGB gravities
coincide, and incidentally some other th... | [
{
"created": "Fri, 27 Mar 2020 09:17:23 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Oct 2020 15:10:46 GMT",
"version": "v2"
},
{
"created": "Sun, 18 Oct 2020 07:00:57 GMT",
"version": "v3"
}
] | 2020-10-20 | [
[
"Ghosh",
"Sushant G.",
""
],
[
"Kumar",
"Rahul",
""
]
] | In recent times there is a surge of interest in constructing Einstein-Gauss-Bonnet (EGB) gravity, in the limit $D \to 4 $, of the $D$-dimensional EGB gravity. Interestingly, the static spherically symmetric solutions in the various proposed $D \to 4 $ regularized EGB gravities coincide, and incidentally some other theo... |
gr-qc/0702069 | John J. Oh | Seungjoon Hyun, Jaehoon Jeong, Wontae Kim, John J. Oh | Formation of Five-Dimensional String Solutions from the Gravitational
Collapse | 17 pages, 10 figures, LaTeX, to appear in Class. Quant. Grav., a
appendix and some discussions added, title changed | Class.Quant.Grav.24:3465-3478,2007 | 10.1088/0264-9381/24/13/020 | null | gr-qc hep-th | null | We study the formation of five-dimensional string solutions including the
Gregory-Laflamme (GL) black string, the Kaluza-Klein (KK) bubble, and the
geometry with a naked singularity from the gravitational collapse. The interior
solutions of five-dimensional Einstein equations describe collapsing
non-isotropic matter ... | [
{
"created": "Tue, 13 Feb 2007 02:12:12 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Mar 2007 07:32:52 GMT",
"version": "v2"
},
{
"created": "Thu, 14 Jun 2007 03:10:04 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Hyun",
"Seungjoon",
""
],
[
"Jeong",
"Jaehoon",
""
],
[
"Kim",
"Wontae",
""
],
[
"Oh",
"John J.",
""
]
] | We study the formation of five-dimensional string solutions including the Gregory-Laflamme (GL) black string, the Kaluza-Klein (KK) bubble, and the geometry with a naked singularity from the gravitational collapse. The interior solutions of five-dimensional Einstein equations describe collapsing non-isotropic matter cl... |
gr-qc/0601107 | Volodymyr Pelykh | Volodymyr Pelykh | Comment on "Self-dual teleparallel formulation of general relativity and
the positive energy theorem" G. Y. Chee | 3 pages | Phys.Rev.D72:108502,2005 | 10.1103/PhysRevD.72.108502 | null | gr-qc | null | We give a correct tensor proof of the positive energy problem for the case
including momentum on basis of conditions of existence of the two-to-one
correspondence between the Sen-Witten spinor field and the Sen-Witten
orthonormal frame. These conditions were obtained in our previous publications,
but true significanc... | [
{
"created": "Wed, 25 Jan 2006 15:32:00 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Pelykh",
"Volodymyr",
""
]
] | We give a correct tensor proof of the positive energy problem for the case including momentum on basis of conditions of existence of the two-to-one correspondence between the Sen-Witten spinor field and the Sen-Witten orthonormal frame. These conditions were obtained in our previous publications, but true significance ... |
1801.00009 | Hong Lu | Wei-Jian Geng, Shou-Long Li, H. Lu and Hao Wei | Godel Metrics with Chronology Protection in Horndeski Gravities | Latex, 11 pages, references added | null | 10.1016/j.physletb.2018.02.075 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | G\"odel universe, one of the most interesting exact solutions predicted by
General Relativity, describes a homogeneous rotating universe containing naked
closed time-like curves (CTCs). It was shown that such CTCs are the consequence
of the null energy condition in General Relativity. In this paper, we show that
the ... | [
{
"created": "Fri, 29 Dec 2017 19:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2018 15:18:06 GMT",
"version": "v2"
}
] | 2018-03-14 | [
[
"Geng",
"Wei-Jian",
""
],
[
"Li",
"Shou-Long",
""
],
[
"Lu",
"H.",
""
],
[
"Wei",
"Hao",
""
]
] | G\"odel universe, one of the most interesting exact solutions predicted by General Relativity, describes a homogeneous rotating universe containing naked closed time-like curves (CTCs). It was shown that such CTCs are the consequence of the null energy condition in General Relativity. In this paper, we show that the G\... |
gr-qc/0002032 | Norbert Wex | N. Wex (MPIfR, Bonn) | Small-eccentricity binary pulsars and relativistic gravity | 4 pages, to be published in Proc. of IAU Colloq. 177, "Pulsar
Astronomy - 2000 and Beyond", eds. M. Kramer, N. Wex & R. Wielebinski | null | null | null | gr-qc | null | Small-eccentricity binary pulsars with white dwarf companions provide
excellent test laboratories for various effects predicted by alternative
theories of gravity, in particular tests for the emission of gravitational
dipole radiation and the existence of gravitational Stark effects. We will
present new limits to the... | [
{
"created": "Mon, 7 Feb 2000 21:38:58 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Wex",
"N.",
"",
"MPIfR, Bonn"
]
] | Small-eccentricity binary pulsars with white dwarf companions provide excellent test laboratories for various effects predicted by alternative theories of gravity, in particular tests for the emission of gravitational dipole radiation and the existence of gravitational Stark effects. We will present new limits to these... |
2204.05712 | Subenoy Chakraborty | A. Bose, S. Chakraborty | Does fractal Universe favour warm inflation: Observational support? | null | Nucl. Phys. B 978, 115767 (2022) | 10.1016/j.nuclphysb.2022.115767 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work examines the possibility of warm inflationary paradigm in
the modified gravity theory with fractal geometry. By choosing the normal fluid
as radiation fluid and the effective fluid (with the extra term in modified
field equation) as the inflaton field both strong and weak dissipative regimes
have bee... | [
{
"created": "Tue, 12 Apr 2022 11:14:19 GMT",
"version": "v1"
}
] | 2022-04-14 | [
[
"Bose",
"A.",
""
],
[
"Chakraborty",
"S.",
""
]
] | The present work examines the possibility of warm inflationary paradigm in the modified gravity theory with fractal geometry. By choosing the normal fluid as radiation fluid and the effective fluid (with the extra term in modified field equation) as the inflaton field both strong and weak dissipative regimes have been ... |
1711.10618 | Alberto Escalante | Alberto Escalante (1), Melissa Rodr\'iguez-Z\'arate (2) ((1) Puebla
U., Inst. Fis., (2) Puebla U., Mexico) | Canonical and Symplectic analysis of actions describing linearized
gravity | null | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By using the canonical and symplectic approaches an (nonstandard) alternative
action describing linearized gravity is studied. We identify the complete set
of Dirac's constraints, the counting of physical degrees of freedom is
performed and the Dirac brackets are constructed. Furthermore, the symplectic
analysis is d... | [
{
"created": "Tue, 28 Nov 2017 23:46:10 GMT",
"version": "v1"
}
] | 2017-11-30 | [
[
"Escalante",
"Alberto",
""
],
[
"Rodríguez-Zárate",
"Melissa",
""
]
] | By using the canonical and symplectic approaches an (nonstandard) alternative action describing linearized gravity is studied. We identify the complete set of Dirac's constraints, the counting of physical degrees of freedom is performed and the Dirac brackets are constructed. Furthermore, the symplectic analysis is dev... |
1906.05455 | Hector O. Silva | Kostas Glampedakis and Hector O. Silva | Eikonal quasinormal modes of black holes beyond General Relativity | 12 pages, 1 figure. Updated to match the published version and it
includes a more rigorous implementation of the eikonal approximation | Phys. Rev. D 100, 044040 (2019) | 10.1103/PhysRevD.100.044040 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Much of our physical intuition about black hole quasinormal modes in general
relativity comes from the eikonal/geometric optics approximation. According to
the well-established eikonal model, the fundamental quasinormal mode represents
wavepackets orbiting in the vicinity of the black hole's geodesic photon ring,
slo... | [
{
"created": "Thu, 13 Jun 2019 02:10:59 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Aug 2019 19:40:41 GMT",
"version": "v2"
}
] | 2019-08-28 | [
[
"Glampedakis",
"Kostas",
""
],
[
"Silva",
"Hector O.",
""
]
] | Much of our physical intuition about black hole quasinormal modes in general relativity comes from the eikonal/geometric optics approximation. According to the well-established eikonal model, the fundamental quasinormal mode represents wavepackets orbiting in the vicinity of the black hole's geodesic photon ring, slowl... |
gr-qc/9310032 | Max Tegmark | Max Tegmark | Apparent wave function collapse caused by scattering | Final published version. 20 pages, Plain TeX, no figures. Online at
http://astro.berkeley.edu/~max/collapse.html (faster from the US), from
http://www.mpa-garching.mpg.de/~max/collapse.html (faster from Europe) or
from max@mppmu.mpg.de | Found. Phys. Lett., 6, 571-590 (1993) | 10.1007/BF00662807 | null | gr-qc | null | Some experimental implications of the recent progress on wave function
collapse are calculated. Exact results are derived for the center-of-mass wave
function collapse caused by random scatterings and applied to a range of
specific examples. The results show that recently proposed experiments to
measure the GRW effec... | [
{
"created": "Mon, 25 Oct 1993 06:47:37 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Mar 1996 16:23:32 GMT",
"version": "v2"
}
] | 2009-10-22 | [
[
"Tegmark",
"Max",
""
]
] | Some experimental implications of the recent progress on wave function collapse are calculated. Exact results are derived for the center-of-mass wave function collapse caused by random scatterings and applied to a range of specific examples. The results show that recently proposed experiments to measure the GRW effect ... |
2108.02974 | Lijing Shao | Ziming Wang, Lijing Shao, Chang Liu | New limits on the Lorentz/CPT symmetry through fifty gravitational-wave
events | 7 pages, 2 figures, 2 tables; accepted by ApJ | ApJ 921 (2021) 158 | 10.3847/1538-4357/ac223c | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lorentz invariance plays a fundamental role in modern physics. However, tiny
violations of the Lorentz invariance may arise in some candidate quantum
gravity theories. Prominent signatures of the gravitational Lorentz invariance
violation (gLIV) include anisotropy, dispersion, and birefringence in the
dispersion rela... | [
{
"created": "Fri, 6 Aug 2021 06:59:26 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Aug 2021 06:16:18 GMT",
"version": "v2"
}
] | 2021-11-12 | [
[
"Wang",
"Ziming",
""
],
[
"Shao",
"Lijing",
""
],
[
"Liu",
"Chang",
""
]
] | Lorentz invariance plays a fundamental role in modern physics. However, tiny violations of the Lorentz invariance may arise in some candidate quantum gravity theories. Prominent signatures of the gravitational Lorentz invariance violation (gLIV) include anisotropy, dispersion, and birefringence in the dispersion relati... |
gr-qc/0302058 | Kouji Nakamura | Kouji Nakamura, Ken-ichi Nakao, and Takeshi Mishima | Hoop Conjecture and Black Holes on a Brane | 7 pages, 1 figure, To be published in Progress of Theoretical Physics
Supplement No. 148 "Brane World: New Perspective in Cosmology" | Prog.Theor.Phys.Suppl.148:291-297,2003 | 10.1143/PTPS.148.291 | NAOJ-Th-Ap 2002, No.14 | gr-qc astro-ph hep-ph hep-th | null | The initial data of gravity for a cylindrical matter distribution confined to
a brane are studied in the framework of the single-brane Randall-Sundrum
scenario. In this scenario, the 5-dimensional nature of gravity appears in the
short-range gravitational interaction. We find that a sufficiently thin
configuration of... | [
{
"created": "Fri, 14 Feb 2003 06:22:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nakamura",
"Kouji",
""
],
[
"Nakao",
"Ken-ichi",
""
],
[
"Mishima",
"Takeshi",
""
]
] | The initial data of gravity for a cylindrical matter distribution confined to a brane are studied in the framework of the single-brane Randall-Sundrum scenario. In this scenario, the 5-dimensional nature of gravity appears in the short-range gravitational interaction. We find that a sufficiently thin configuration of m... |
gr-qc/0312055 | Campo David | David Campo and Renaud Parentani | Space-time correlations in inflationary spectra, a wave packet analysis | revised version, accepted for publication in PRD ; the
complementarity and the usefullness of wave packet analysis have been
emphasized ; 32 pages, 6 figures | Phys.Rev. D70 (2004) 105020 | 10.1103/PhysRevD.70.105020 | null | gr-qc astro-ph hep-th | null | The inflationary mechanism of mode amplification predicts that the state of
each mode with a given wave vector is correlated to that of its partner mode
with the opposite vector. This implies nonlocal correlations which leave their
imprint on temperature anisotropies in the cosmic microwave background. Their
spatial ... | [
{
"created": "Tue, 9 Dec 2003 17:01:55 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Jul 2004 14:26:22 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Campo",
"David",
""
],
[
"Parentani",
"Renaud",
""
]
] | The inflationary mechanism of mode amplification predicts that the state of each mode with a given wave vector is correlated to that of its partner mode with the opposite vector. This implies nonlocal correlations which leave their imprint on temperature anisotropies in the cosmic microwave background. Their spatial pr... |
gr-qc/0304084 | Harihar Behera | Harihar Behera and P. C. Naik | Gravitomagnetic Moments and Dynamics of Dirac's (spin 1/2) fermions in
flat space-time Maxwellian Gravity | 27 pages | Int.J.Mod.Phys. A19 (2004) 4207-4230 | 10.1142/S0217751X04017768 | null | gr-qc | null | The gravitational effects in the relativistic quantum mechanics are
investigated in a relativistically derived version of Heaviside's speculative
Gravity (in flat space-time) named here as Maxwellian Gravity. The standard
Dirac's approach to the intrinsic spin in the fields of Maxwellian Gravity
yields the gravitomag... | [
{
"created": "Tue, 22 Apr 2003 18:53:28 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Apr 2003 20:04:19 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Behera",
"Harihar",
""
],
[
"Naik",
"P. C.",
""
]
] | The gravitational effects in the relativistic quantum mechanics are investigated in a relativistically derived version of Heaviside's speculative Gravity (in flat space-time) named here as Maxwellian Gravity. The standard Dirac's approach to the intrinsic spin in the fields of Maxwellian Gravity yields the gravitomagne... |
1109.6140 | Walter Simon | Walter Simon | Bounds on area and charge for marginally trapped surfaces with
cosmological constant | minor corrections to previous version and to published version | 2012 Class. Quantum Grav. 29 062001 | 10.1088/0264-9381/29/6/062001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We sharpen the known inequalities $A \Lambda \le 4\pi (1-g)$ and $A\ge 4\pi
Q^2$ between the area $A$ and the electric charge $Q$ of a stable marginally
outer trapped surface (MOTS) of genus g in the presence of a cosmological
constant $\Lambda$. In particular, instead of requiring stability we include
the principal ... | [
{
"created": "Wed, 28 Sep 2011 09:26:23 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Dec 2011 16:37:51 GMT",
"version": "v2"
},
{
"created": "Wed, 21 Dec 2011 11:44:55 GMT",
"version": "v3"
},
{
"created": "Mon, 9 Jan 2012 11:29:17 GMT",
"version": "v4"
},
{
"cr... | 2012-05-04 | [
[
"Simon",
"Walter",
""
]
] | We sharpen the known inequalities $A \Lambda \le 4\pi (1-g)$ and $A\ge 4\pi Q^2$ between the area $A$ and the electric charge $Q$ of a stable marginally outer trapped surface (MOTS) of genus g in the presence of a cosmological constant $\Lambda$. In particular, instead of requiring stability we include the principal ei... |
1911.04438 | Eric Ling | Eric Ling | Aspects of $C^0$ causal theory | 40 pages, 6 figures. v2: references fixed and proof of prop 3.7
fixed. v3: added acknowledgement to Mittag-Leffler program. v4: to appear in
GRG | null | 10.1007/s10714-020-02708-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper serves as an introduction to $C^0$ causal theory. We focus on
those parts of the theory which have proven useful for establishing spacetime
inextendibility results in low regularity -- a question which is motivated by
the strong cosmic censorship conjecture in general relativity. This paper is
self-contain... | [
{
"created": "Mon, 11 Nov 2019 18:31:16 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Nov 2019 16:10:52 GMT",
"version": "v2"
},
{
"created": "Mon, 2 Dec 2019 13:50:34 GMT",
"version": "v3"
},
{
"created": "Tue, 2 Jun 2020 12:32:56 GMT",
"version": "v4"
}
] | 2020-06-17 | [
[
"Ling",
"Eric",
""
]
] | This paper serves as an introduction to $C^0$ causal theory. We focus on those parts of the theory which have proven useful for establishing spacetime inextendibility results in low regularity -- a question which is motivated by the strong cosmic censorship conjecture in general relativity. This paper is self-contained... |
gr-qc/0305074 | Allan Joseph Medved | Gilad Gour and A.J.M. Medved | Questions of Stability near Black Hole Critical Points | 10 pages, Revtex | Phys.Rev. D68 (2003) 067501 | 10.1103/PhysRevD.68.067501 | null | gr-qc hep-th | null | In this letter, we discuss how thermal fluctuations can effect the stability
of (generally) charged black holes when close to certain critical points. Our
novel treatment utilizes the black hole area spectrum (which is, for
definiteness, taken to be evenly spaced) and makes an important distinction
between fixed and ... | [
{
"created": "Mon, 19 May 2003 23:54:36 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Gour",
"Gilad",
""
],
[
"Medved",
"A. J. M.",
""
]
] | In this letter, we discuss how thermal fluctuations can effect the stability of (generally) charged black holes when close to certain critical points. Our novel treatment utilizes the black hole area spectrum (which is, for definiteness, taken to be evenly spaced) and makes an important distinction between fixed and fl... |
gr-qc/0207040 | Luis Herrera | L. Herrera, J. Martin and J. Ospino | Anisotropic geodesic fluid spheres in general relativity | 13 pages Latex, three ps. figures, to appear in J. Math. Physics | J.Math.Phys. 43 (2002) 4889-4897 | 10.1063/1.1505985 | null | gr-qc | null | It is shown that unlike the perfect fluid case, anisotropic fluids (principal
stresses unequal) may be geodesic, without this implying the vanishing of
(spatial) pressure gradients. Then the condition of vanishing four acceleration
is integrated in non-comoving coordinates. The resulting models are necessarily
dynami... | [
{
"created": "Tue, 9 Jul 2002 16:04:10 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Herrera",
"L.",
""
],
[
"Martin",
"J.",
""
],
[
"Ospino",
"J.",
""
]
] | It is shown that unlike the perfect fluid case, anisotropic fluids (principal stresses unequal) may be geodesic, without this implying the vanishing of (spatial) pressure gradients. Then the condition of vanishing four acceleration is integrated in non-comoving coordinates. The resulting models are necessarily dynamic,... |
2107.01937 | Francisco Lobo | Tiberiu Harko, Francisco S. N. Lobo, Emmanuel N. Saridakis | Gravitationally Induced Particle Production through a Nonminimal
Torsion-Matter Coupling | 24 pages, 3 figures. Invited contribution to the Special Issue
"Teleparallel Gravity: Foundations and Observational Constraints". Matches
published version | Universe 2021, 7(7), 227 | 10.3390/universe7070227 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the possibility of gravitationally generated particle
production via the mechanism of nonminimal torsion--matter coupling. An
intriguing feature of this theory is that the divergence of the matter
energy--momentum tensor does not vanish identically. We explore the physical
and cosmological implications... | [
{
"created": "Mon, 5 Jul 2021 11:08:53 GMT",
"version": "v1"
}
] | 2021-07-06 | [
[
"Harko",
"Tiberiu",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We investigate the possibility of gravitationally generated particle production via the mechanism of nonminimal torsion--matter coupling. An intriguing feature of this theory is that the divergence of the matter energy--momentum tensor does not vanish identically. We explore the physical and cosmological implications o... |
gr-qc/9209003 | Geza Ful{\o}p | G\'eza F\"ul\"op | Transformations and BRST-Charges in 2+1 Dimensional Gravitation | 10 pages | Mod.Phys.Lett.A7:3495-3502,1992 | 10.1142/S0217732392002901 | report G\"oteborg ITP 92-39 | gr-qc hep-th | null | Canonical transformations relating the variables of the ADM-, Ashtekar's and
Witten's formulations of gravity are computed in 2+1~dimensions. Three
different forms of the BRST-charge are given in the 2+1 dimensional Ashtekar
formalism, two of them using Ashtekar's form of the constraints and one of them
using the for... | [
{
"created": "Tue, 8 Sep 1992 13:34:59 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Fülöp",
"Géza",
""
]
] | Canonical transformations relating the variables of the ADM-, Ashtekar's and Witten's formulations of gravity are computed in 2+1~dimensions. Three different forms of the BRST-charge are given in the 2+1 dimensional Ashtekar formalism, two of them using Ashtekar's form of the constraints and one of them using the forms... |
gr-qc/0508117 | Tonatiuh Matos | Tonatiuh Matos and Dario Nunez | Rotating Scalar Field Wormhole | Sign of the exponential in equation (10) has been changed. Some typos
corrected | Class.Quant.Grav. 23 (2006) 4485-4496 | 10.1088/0264-9381/23/13/012 | CIEA 22/08/05 | gr-qc hep-th | null | We derive an exact solution to the Einstein's equations with a stress-energy
tensor corresponding to an opposite-sign scalar field, and show that such a
solution describes the internal region of a rotating wormhole. We also derive
an static wormhole asymptotically flat solution and match them on both regions,
thus ob... | [
{
"created": "Mon, 29 Aug 2005 05:27:21 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Sep 2005 05:20:38 GMT",
"version": "v2"
},
{
"created": "Mon, 24 Apr 2006 19:50:59 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Matos",
"Tonatiuh",
""
],
[
"Nunez",
"Dario",
""
]
] | We derive an exact solution to the Einstein's equations with a stress-energy tensor corresponding to an opposite-sign scalar field, and show that such a solution describes the internal region of a rotating wormhole. We also derive an static wormhole asymptotically flat solution and match them on both regions, thus obta... |
2202.11328 | Magd Elias Kahil | Magd E. Kahil | Motion of Poly-vectors in Fractal Clifford Spaces | 9 TeX pages | MSA University Engineering Journal Vol 1 issue 2 ,2022 | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | Fractal Clifford Spaces (FCS) may be considered as a challenging approach to
the unification of micro-physics and macro-physics. Trajectories of these
manifolds are described by different poly-vectors describing paths and their
deviation equations for not only to test particles but also for charged,
rotating and rota... | [
{
"created": "Wed, 23 Feb 2022 06:58:34 GMT",
"version": "v1"
}
] | 2022-04-13 | [
[
"Kahil",
"Magd E.",
""
]
] | Fractal Clifford Spaces (FCS) may be considered as a challenging approach to the unification of micro-physics and macro-physics. Trajectories of these manifolds are described by different poly-vectors describing paths and their deviation equations for not only to test particles but also for charged, rotating and rotati... |
2211.10167 | Suraj Maurya | Suraj Maurya, Sashideep Gutti and Rahul Nigam | Effects of charge on the interior volume of BTZ black holes | 11 pages, 5 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this article we extend the variational technique for maximal volume
estimation of a black hole developed by Christodoulou and Rovelli (CR) to the
case of a charged BTZ black hole in 2+1 dimensions. The technique involves a
study of the equation of motion of a hypothetical particle moving in an
auxiliary manifold d... | [
{
"created": "Fri, 18 Nov 2022 11:26:38 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Nov 2022 13:35:54 GMT",
"version": "v2"
}
] | 2024-07-02 | [
[
"Maurya",
"Suraj",
""
],
[
"Gutti",
"Sashideep",
""
],
[
"Nigam",
"Rahul",
""
]
] | In this article we extend the variational technique for maximal volume estimation of a black hole developed by Christodoulou and Rovelli (CR) to the case of a charged BTZ black hole in 2+1 dimensions. The technique involves a study of the equation of motion of a hypothetical particle moving in an auxiliary manifold def... |
0804.0169 | Jose M. Isidro | J.M. Isidro, J.L. Gonzalez-Santander, P. Fernandez de Cordoba | A note on the quantum of time | 4 pages, some refs added | Mod.Phys.Lett.A23:1161-1165,2008 | 10.1142/S0217732308027126 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum mechanics rests on the assumption that time is a classical variable.
As such, classical time is assumed to be measurable with infinite accuracy.
However, all real clocks are subject to quantum fluctuations, which leads to
the existence of a nonzero uncertainty in the time variable. The existence of a
quantum ... | [
{
"created": "Tue, 1 Apr 2008 13:37:39 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Apr 2008 13:53:42 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Isidro",
"J. M.",
""
],
[
"Gonzalez-Santander",
"J. L.",
""
],
[
"de Cordoba",
"P. Fernandez",
""
]
] | Quantum mechanics rests on the assumption that time is a classical variable. As such, classical time is assumed to be measurable with infinite accuracy. However, all real clocks are subject to quantum fluctuations, which leads to the existence of a nonzero uncertainty in the time variable. The existence of a quantum of... |
2308.06731 | Shin'ichi Nojiri | Shin'ichi Nojiri and Sergei. D. Odintsov | Propagation Speed of Gravitational Wave in
Scalar--Einstein--Gauss-Bonnet Gravity | LaTeX, 12 pages, to appear in Nuclear Physics B | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The propagation speed of the gravitational wave in
scalar--Einstein--Gauss-Bonnet (sEGB) gravity is generally different from that
of light. Using differential equation conditions for the speed of gravitational
waves to coincide with the light speed in the expanding universe, we
constructed a general class of sEGB gra... | [
{
"created": "Sun, 13 Aug 2023 09:27:35 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Aug 2023 17:20:44 GMT",
"version": "v2"
},
{
"created": "Sat, 2 Sep 2023 07:17:39 GMT",
"version": "v3"
},
{
"created": "Mon, 11 Dec 2023 01:02:55 GMT",
"version": "v4"
}
] | 2023-12-12 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei. D.",
""
]
] | The propagation speed of the gravitational wave in scalar--Einstein--Gauss-Bonnet (sEGB) gravity is generally different from that of light. Using differential equation conditions for the speed of gravitational waves to coincide with the light speed in the expanding universe, we constructed a general class of sEGB gravi... |
gr-qc/9801026 | Sergei Odintsov | L.N. Granda and S.D. Odintsov | Effective average action and nonperturbative renormalization group
equation in higher derivative quantum gravity | Latex file, 10 pages, to appear in Grav.and Cosm.,v.4,1998 | Grav.Cosmol. 4 (1998) 85-95 | null | null | gr-qc | null | We study the exact renormalization group (RG) in $R^2$-gravity in the
effective average action formalism using the background field method. The
truncated evolution equation (where truncation is made to low-derivatives
functionals space) for such a theory in a de Sitter background leads to a set
of nonperturbative RG ... | [
{
"created": "Fri, 9 Jan 1998 15:25:05 GMT",
"version": "v1"
},
{
"created": "Wed, 27 May 1998 02:10:51 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Granda",
"L. N.",
""
],
[
"Odintsov",
"S. D.",
""
]
] | We study the exact renormalization group (RG) in $R^2$-gravity in the effective average action formalism using the background field method. The truncated evolution equation (where truncation is made to low-derivatives functionals space) for such a theory in a de Sitter background leads to a set of nonperturbative RG eq... |
1409.5695 | Israel Quiros | Israel Quiros | On a symmetry relating gravity with antigravity | 9 pages, no figures. This is a sequel to the earlier paper
arXiv:gr-qc/0411064. A section on the normalized gravitational charge added.
Physical discussion enriched | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I investigate the impact of a "would be" fundamental symmetry of the laws of
nature under the interchange of gravity and antigravity, on the understanding
of negative energies in general relativity. For this purpose a toy model that
is based on Einstein-Hilbert gravity with two minimally coupled
self-interacting scal... | [
{
"created": "Thu, 18 Sep 2014 18:24:26 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Oct 2014 01:21:53 GMT",
"version": "v2"
}
] | 2014-10-03 | [
[
"Quiros",
"Israel",
""
]
] | I investigate the impact of a "would be" fundamental symmetry of the laws of nature under the interchange of gravity and antigravity, on the understanding of negative energies in general relativity. For this purpose a toy model that is based on Einstein-Hilbert gravity with two minimally coupled self-interacting scalar... |
gr-qc/0103087 | Peter Dunsby | Deon Solomons, Peter Dunsby and George Ellis | Bounce behaviour in Kantowski-Sachs and Bianchi Cosmologies | Matches published version | Class.Quant.Grav.23:6585-6597,2006 | 10.1088/0264-9381/23/23/001 | null | gr-qc | null | Many cosmological scenarios envisage either a bounce of the universe at early
times, or collapse of matter locally to form a black hole which re-expands into
a new expanding universe region. Energy conditions preclude this happening for
ordinary matter in general relativistic universes, but scalar or dilatonic
fields... | [
{
"created": "Fri, 23 Mar 2001 12:22:29 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 2006 12:54:09 GMT",
"version": "v2"
}
] | 2010-05-28 | [
[
"Solomons",
"Deon",
""
],
[
"Dunsby",
"Peter",
""
],
[
"Ellis",
"George",
""
]
] | Many cosmological scenarios envisage either a bounce of the universe at early times, or collapse of matter locally to form a black hole which re-expands into a new expanding universe region. Energy conditions preclude this happening for ordinary matter in general relativistic universes, but scalar or dilatonic fields c... |
1502.03880 | Y. M. Cho | Masakatsu Kenmoku and Y. M. Cho | Bargmann-Wigner Formulation and Superradiance Problem of Bosons and
Fermions in Kerr Space-time | null | Int. J. Mod. Phys. Lett. A 30, 1550052 (2015) | 10.1142/S0217751X15500529 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The superradiance phenomena of massive bosons and fermions in the Kerr
spacetime are studied in the Bargmann-Wigner formulation. In case of bi-spinor,
the four independent components spinors correspond to the four bosonic freedom:
one scalar and three vectors uniquely. The consistent description of the
Bargmann-Wigne... | [
{
"created": "Fri, 13 Feb 2015 03:45:23 GMT",
"version": "v1"
}
] | 2018-03-22 | [
[
"Kenmoku",
"Masakatsu",
""
],
[
"Cho",
"Y. M.",
""
]
] | The superradiance phenomena of massive bosons and fermions in the Kerr spacetime are studied in the Bargmann-Wigner formulation. In case of bi-spinor, the four independent components spinors correspond to the four bosonic freedom: one scalar and three vectors uniquely. The consistent description of the Bargmann-Wigner ... |
1702.07346 | Singh Ibungochouba Telem | T. Ibungochouba Singh | Quantum Radiation Properties of General Nonstationary Black Hole | Accepted in Advances in High Energy Physics, Hindawi Publishing
Corporation | null | null | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the generalized tortoise coordinate transformations the quantum
radiation properties of Klein-Gordon scalar particles, Maxwell's
electromagnetic field equations and Dirac equations are investigated in general
non-stationary black hole. The locations of the event horizon and the Hawking
temperature depend on bot... | [
{
"created": "Thu, 23 Feb 2017 10:10:17 GMT",
"version": "v1"
}
] | 2017-02-27 | [
[
"Singh",
"T. Ibungochouba",
""
]
] | Using the generalized tortoise coordinate transformations the quantum radiation properties of Klein-Gordon scalar particles, Maxwell's electromagnetic field equations and Dirac equations are investigated in general non-stationary black hole. The locations of the event horizon and the Hawking temperature depend on both ... |
2407.13820 | Emanuele Panella | Jonathan Oppenheim, Emanuele Panella and Andrew Pontzen | Emergence of phantom cold dark matter from spacetime diffusion | 21 pages + appendix | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A way to reconcile general relativity and quantum field theory without
quantising the geometry is to demand the metric evolve stochastically. In this
article, we explore the consequences of such a proposal at early cosmological
times. We find the stochastic evolution results in the spatial metric diffusing
away from ... | [
{
"created": "Thu, 18 Jul 2024 18:00:02 GMT",
"version": "v1"
}
] | 2024-07-22 | [
[
"Oppenheim",
"Jonathan",
""
],
[
"Panella",
"Emanuele",
""
],
[
"Pontzen",
"Andrew",
""
]
] | A way to reconcile general relativity and quantum field theory without quantising the geometry is to demand the metric evolve stochastically. In this article, we explore the consequences of such a proposal at early cosmological times. We find the stochastic evolution results in the spatial metric diffusing away from it... |
gr-qc/9907073 | Valeri Frolov | V. Frolov and D. Singh | Quantum Effects in the Presence of Expanding Semi-Transparent Spherical
Mirrors | 28 pages, Paper is slightly reorganized, additional references are
added | Class.Quant.Grav. 16 (1999) 3693-3716 | 10.1088/0264-9381/16/11/315 | null | gr-qc hep-ph hep-th quant-ph | null | We study quantum effects in the presence of a spherical semi-transparent
mirror or a system of two concentric mirrors which expand with a constant
acceleration in a flat D-dimensional spacetime. Using the Euclidean approach,
we obtain expressions for fluctuations and the renormalized value of
stress-energy tensor for... | [
{
"created": "Fri, 23 Jul 1999 19:45:17 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Sep 1999 21:25:27 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Frolov",
"V.",
""
],
[
"Singh",
"D.",
""
]
] | We study quantum effects in the presence of a spherical semi-transparent mirror or a system of two concentric mirrors which expand with a constant acceleration in a flat D-dimensional spacetime. Using the Euclidean approach, we obtain expressions for fluctuations and the renormalized value of stress-energy tensor for a... |
gr-qc/0703013 | Joachim Schr\"oter | Joachim Schr\"oter | A New Formulation of General Relativity - Part I: Pre-Radar Charts as
Generating Functions for Metric and Velocity | 23 pages, 1 figure | null | null | null | gr-qc | null | In this paper (Part I of a series of three papers) an axiomatic formulation
of GR is given, here use is made of the concept of pre-radar charts. These
charts have "infinitesimally" the same properties as the true radar charts used
in space-time theory. Their existence in GR has far-reaching consequences which
are dis... | [
{
"created": "Fri, 2 Mar 2007 14:50:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schröter",
"Joachim",
""
]
] | In this paper (Part I of a series of three papers) an axiomatic formulation of GR is given, here use is made of the concept of pre-radar charts. These charts have "infinitesimally" the same properties as the true radar charts used in space-time theory. Their existence in GR has far-reaching consequences which are discu... |
2308.05392 | Farux Abdulxamidov | Farrux Abdulxamidov, Javlon Rayimbaev, Ahmadjon Abdujabbarov, and
Zden\v{e}k Stuchl\'ik | Spinning magnetized particles orbiting magnetized Schwarzschild black
holes | 13 pages, 9 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A way to test electromagnetic field and spacetime properties around black
holes is by considering the dynamics of test particles. In fact, in real
astrophysical scenarios, it is hard to determine spacetime geometry which is
dominating due to degeneracy gravitational effects in parameters of gravity
theories. In this ... | [
{
"created": "Thu, 10 Aug 2023 07:13:12 GMT",
"version": "v1"
}
] | 2023-08-11 | [
[
"Abdulxamidov",
"Farrux",
""
],
[
"Rayimbaev",
"Javlon",
""
],
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Stuchlík",
"Zdeněk",
""
]
] | A way to test electromagnetic field and spacetime properties around black holes is by considering the dynamics of test particles. In fact, in real astrophysical scenarios, it is hard to determine spacetime geometry which is dominating due to degeneracy gravitational effects in parameters of gravity theories. In this wo... |
1604.00246 | Kentaro Takami | Luciano Rezzolla and Kentaro Takami | Gravitational-wave signal from binary neutron stars: a systematic
analysis of the spectral properties | 20 pages, 11 figures, 2 tables; Minor revisions, matches accepted
version on PRD | Phys. Rev. D 93, 124051 (2016) | 10.1103/PhysRevD.93.124051 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A number of works have shown that important information on the equation of
state of matter at nuclear density can be extracted from the gravitational
waves emitted by merging neutron-star binaries. We present a comprehensive
analysis of the gravitational-wave signal emitted during the inspiral, merger
and post-merger... | [
{
"created": "Fri, 1 Apr 2016 13:55:19 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Jun 2016 08:27:21 GMT",
"version": "v2"
}
] | 2016-06-29 | [
[
"Rezzolla",
"Luciano",
""
],
[
"Takami",
"Kentaro",
""
]
] | A number of works have shown that important information on the equation of state of matter at nuclear density can be extracted from the gravitational waves emitted by merging neutron-star binaries. We present a comprehensive analysis of the gravitational-wave signal emitted during the inspiral, merger and post-merger o... |
gr-qc/9805019 | Sean Hayward | Sean A. Hayward | Dynamic wormholes | 5 revtex pages, 4 eps figures. Minor change which did not reach
publishers | Int.J.Mod.Phys. D8 (1999) 373-382 | 10.1142/S0218271899000286 | null | gr-qc | null | A new framework is proposed for general dynamic wormholes, unifying them with
black holes. Both are generically defined locally by outer trapping horizons,
temporal for wormholes and spatial or null for black and white holes. Thus
wormhole horizons are two-way traversible, while black-hole and white-hole
horizons are... | [
{
"created": "Thu, 7 May 1998 08:25:37 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Dec 1998 08:04:48 GMT",
"version": "v2"
},
{
"created": "Fri, 14 Apr 2000 17:41:03 GMT",
"version": "v3"
}
] | 2009-10-31 | [
[
"Hayward",
"Sean A.",
""
]
] | A new framework is proposed for general dynamic wormholes, unifying them with black holes. Both are generically defined locally by outer trapping horizons, temporal for wormholes and spatial or null for black and white holes. Thus wormhole horizons are two-way traversible, while black-hole and white-hole horizons are o... |
2306.01927 | Kuantay Boshkayev | Kuantay Boshkayev, Gulnara Suliyeva, Vladimir Ivashchuk, Ainur
Urazalina | Circular geodesics in the field of double-charged dilatonic black holes | 12 pages, 13 figures, 2 tables | Eur. Phys. J. C 84, 19 (2024) | 10.1140/epjc/s10052-023-12337-6 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | A non-extreme dilatonic charged (by two ``color electric'' charges) black
hole solution is examined within a four-dimensional gravity model that
incorporates two scalar (dilaton) fields and two Abelian vector fields. The
scalar and vector fields interact through exponential terms containing two
dilatonic coupling vec... | [
{
"created": "Fri, 2 Jun 2023 21:48:36 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Jan 2024 17:38:44 GMT",
"version": "v2"
}
] | 2024-01-10 | [
[
"Boshkayev",
"Kuantay",
""
],
[
"Suliyeva",
"Gulnara",
""
],
[
"Ivashchuk",
"Vladimir",
""
],
[
"Urazalina",
"Ainur",
""
]
] | A non-extreme dilatonic charged (by two ``color electric'' charges) black hole solution is examined within a four-dimensional gravity model that incorporates two scalar (dilaton) fields and two Abelian vector fields. The scalar and vector fields interact through exponential terms containing two dilatonic coupling vecto... |
2006.06291 | Jose M. Isidro | J.C. Castro-Palacio, P. Fernandez de Cordoba, J.M. Isidro | The cosmological constant of emergent spacetime in the Newtonian
approximation | 11 pages; refs. added | null | 10.1142/S0218271820500935 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a simple quantum-mechanical estimate of the cosmological constant
of a Newtonian Universe. We first mimic the dynamics of a Newtonian spacetime
by means of a nonrelativistic quantum mechanics for the matter contents of the
Universe (baryonic and dark) within a fixed (i.e., nondynamical) Euclidean
spacetime... | [
{
"created": "Thu, 11 Jun 2020 09:56:31 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jun 2020 13:24:45 GMT",
"version": "v2"
}
] | 2020-12-02 | [
[
"Castro-Palacio",
"J. C.",
""
],
[
"de Cordoba",
"P. Fernandez",
""
],
[
"Isidro",
"J. M.",
""
]
] | We present a simple quantum-mechanical estimate of the cosmological constant of a Newtonian Universe. We first mimic the dynamics of a Newtonian spacetime by means of a nonrelativistic quantum mechanics for the matter contents of the Universe (baryonic and dark) within a fixed (i.e., nondynamical) Euclidean spacetime. ... |
gr-qc/9909050 | Nils Andersson | Nils Andersson and Kostas Glampedakis | A superradiance resonance cavity outside rapidly rotating black holes | 4 pages, 2 postscript figures | Phys.Rev.Lett. 84 (2000) 4537-4540 | 10.1103/PhysRevLett.84.4537 | null | gr-qc | null | We discuss the late-time behaviour of a dynamically perturbed Kerr black
hole. We present analytic results for near extreme Kerr black holes that show
that the large number of virtually undamped quasinormal modes that exist for
nonzero values of the azimuthal eigenvalue m combine in such a way that the
field oscillat... | [
{
"created": "Thu, 16 Sep 1999 09:21:32 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Andersson",
"Nils",
""
],
[
"Glampedakis",
"Kostas",
""
]
] | We discuss the late-time behaviour of a dynamically perturbed Kerr black hole. We present analytic results for near extreme Kerr black holes that show that the large number of virtually undamped quasinormal modes that exist for nonzero values of the azimuthal eigenvalue m combine in such a way that the field oscillates... |
gr-qc/0610048 | Ingunn Kathrine Wehus | Ingunn Kathrine Wehus and Finn Ravndal | Gravity coupled to a scalar field in extra dimensions | v2, 10 pages, minor change, two more references, published version.
Extended version of talk given at ERE2006, Palma de Mallorca, Spain, Sept.
4-8, 2006 | J.Phys.Conf.Ser.66:012024,2007 | 10.1088/1742-6596/66/1/012024 | null | gr-qc | null | In d+1 dimensions we solve the equations of motion for the case of gravity
minimally or conformally coupled to a scalar field. For the minimally coupled
system the equations can either be solved directly or by transforming vacuum
solutions, as shown before in 3+1 dimensions by Buchdahl. In d+1 dimensions the
solution... | [
{
"created": "Tue, 10 Oct 2006 19:05:11 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Jun 2007 23:57:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Wehus",
"Ingunn Kathrine",
""
],
[
"Ravndal",
"Finn",
""
]
] | In d+1 dimensions we solve the equations of motion for the case of gravity minimally or conformally coupled to a scalar field. For the minimally coupled system the equations can either be solved directly or by transforming vacuum solutions, as shown before in 3+1 dimensions by Buchdahl. In d+1 dimensions the solutions ... |
1711.11244 | Vivek Venkatraman Krishnan | V. Venkatraman Krishnan, W. van Straten, P. A. Rosado, M. Bailes, E.
F. Keane, R. Bhat, C. Flynn | Strong field tests of gravity with PSR J1141-6545 | 4 pages, 1 figure, IAU 337 symposium on Pulsar Astrophysics: The Next
Fifty Years | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The initial results from timing observations of PSR J1141-6545, a
relativistic pulsar white-dwarf binary system, are presented. Predictions from
the timing baseline hint at the most stringent test of gravity by an asymmetric
binary yet. The timing precision has been hindered by the dramatic variations
of the pulse pr... | [
{
"created": "Thu, 30 Nov 2017 05:48:37 GMT",
"version": "v1"
}
] | 2017-12-01 | [
[
"Krishnan",
"V. Venkatraman",
""
],
[
"van Straten",
"W.",
""
],
[
"Rosado",
"P. A.",
""
],
[
"Bailes",
"M.",
""
],
[
"Keane",
"E. F.",
""
],
[
"Bhat",
"R.",
""
],
[
"Flynn",
"C.",
""
]
] | The initial results from timing observations of PSR J1141-6545, a relativistic pulsar white-dwarf binary system, are presented. Predictions from the timing baseline hint at the most stringent test of gravity by an asymmetric binary yet. The timing precision has been hindered by the dramatic variations of the pulse prof... |
gr-qc/9706020 | B. Linet | B. Boisseau, B. Linet | Dynamics of a self-gravitating thin string in scalar-tensor theories of
gravitation | 10 pages, latex, no figures | Class.Quant.Grav. 14 (1997) 3063-3071 | 10.1088/0264-9381/14/11/008 | null | gr-qc | null | We examine the dynamics of a self-gravitating string in the scalar-tensor
theories of gravitation by considering a thin tube of matter to describe it.
For a class of solutions, we obtain in the generic case that the extrinsic
curvature of the world sheet of the central line is null in the limit where the
radius of th... | [
{
"created": "Mon, 9 Jun 1997 10:16:29 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Boisseau",
"B.",
""
],
[
"Linet",
"B.",
""
]
] | We examine the dynamics of a self-gravitating string in the scalar-tensor theories of gravitation by considering a thin tube of matter to describe it. For a class of solutions, we obtain in the generic case that the extrinsic curvature of the world sheet of the central line is null in the limit where the radius of the ... |
1310.6728 | Edward Wilson-Ewing | Parampreet Singh, Edward Wilson-Ewing | Quantization ambiguities and bounds on geometric scalars in anisotropic
loop quantum cosmology | 34 pages, v2: minor changes | Class.Quant.Grav.31:035010,2014 | 10.1088/0264-9381/31/3/035010 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study quantization ambiguities in loop quantum cosmology that arise for
space-times with non-zero spatial curvature and anisotropies. Motivated by
lessons from different possible loop quantizations of the closed
Friedmann-Lemaitre-Robertson-Walker cosmology, we find that using open
holonomies of the extrinsic curv... | [
{
"created": "Thu, 24 Oct 2013 19:49:08 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jan 2014 15:31:52 GMT",
"version": "v2"
}
] | 2015-06-17 | [
[
"Singh",
"Parampreet",
""
],
[
"Wilson-Ewing",
"Edward",
""
]
] | We study quantization ambiguities in loop quantum cosmology that arise for space-times with non-zero spatial curvature and anisotropies. Motivated by lessons from different possible loop quantizations of the closed Friedmann-Lemaitre-Robertson-Walker cosmology, we find that using open holonomies of the extrinsic curvat... |
gr-qc/0009070 | hamid Reza Sepangi | M. Mohseni and H. R. Sepangi | Gravitational waves and spinning test particles | 11 pages, one eps figure, to appear in Class. Quantum Grav | Class.Quant.Grav. 17 (2000) 4615-4625 | 10.1088/0264-9381/17/22/302 | null | gr-qc astro-ph hep-th | null | The motion of a classical spinning test particle in the field of a weak plane
gravitational wave is studied. It is found that the characteristic dimensions
of the particle's orbit is sensitive to the ratio of the spin to the mass of
the particle. The results are compared with the corresponding motion of a
particle wi... | [
{
"created": "Wed, 20 Sep 2000 06:28:35 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Mohseni",
"M.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | The motion of a classical spinning test particle in the field of a weak plane gravitational wave is studied. It is found that the characteristic dimensions of the particle's orbit is sensitive to the ratio of the spin to the mass of the particle. The results are compared with the corresponding motion of a particle with... |
2010.02279 | Charis Anastopoulos | Charis Anastopoulos and Ntina Savvidou | Classification theorem and properties of singular solutions to the
Tolman-Oppenheimer-Volkoff equation | 32 pages, 7 figures. Small revisions, some explanations added; to
appear in CQG | null | 10.1088/1361-6382/abdf26 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Tolman-Oppenheimer-Volkoff (TOV) equation admits singular solutions in
addition to regular ones. Here, we prove the following theorem. For any
equation of state that (i) is obtained from an entropy function, (ii) has
positive pressure and (iii) satisfies the dominant energy condition, the TOV
equation can be inte... | [
{
"created": "Mon, 5 Oct 2020 18:38:22 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jan 2021 15:23:05 GMT",
"version": "v2"
}
] | 2021-06-09 | [
[
"Anastopoulos",
"Charis",
""
],
[
"Savvidou",
"Ntina",
""
]
] | The Tolman-Oppenheimer-Volkoff (TOV) equation admits singular solutions in addition to regular ones. Here, we prove the following theorem. For any equation of state that (i) is obtained from an entropy function, (ii) has positive pressure and (iii) satisfies the dominant energy condition, the TOV equation can be integr... |
gr-qc/0206063 | null | Marek A. Abramowicz and Wlodek Kluzniak | Epicyclic orbital oscillations in Newton's and Einstein's dynamics | 8 pages | Gen.Rel.Grav. 35 (2003) 69-77 | 10.1023/A:1021354928292 | null | gr-qc astro-ph | null | We apply Feynman's principle, ``The same equations have the same solutions'',
to Kepler's problem and show that Newton's dynamics in a properly curved 3-D
space is identical with that described by Einstein's theory in the 3-D optical
geometry of Schwarzschild's spacetime. For this reason, rather unexpectedly,
Newton'... | [
{
"created": "Thu, 20 Jun 2002 17:25:27 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Abramowicz",
"Marek A.",
""
],
[
"Kluzniak",
"Wlodek",
""
]
] | We apply Feynman's principle, ``The same equations have the same solutions'', to Kepler's problem and show that Newton's dynamics in a properly curved 3-D space is identical with that described by Einstein's theory in the 3-D optical geometry of Schwarzschild's spacetime. For this reason, rather unexpectedly, Newton's ... |
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