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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/9609049 | Mr Blanchet Darc | L. Blanchet | Gravitational radiation reaction and balance equations to post-Newtonian
order | To appear in Phys. Rev. D | Phys.Rev.D55:714-732,1997 | 10.1103/PhysRevD.55.714 | null | gr-qc | null | Gravitational radiation reaction forces and balance equations for energy and
momenta are investigated to 3/2 post-Newtonian (1.5PN) order beyond the
quadrupole approximation, corresponding to the 4PN order in the equations of
motion of an isolated system. By matching a post-Newtonian solution for the
gravitational fi... | [
{
"created": "Fri, 20 Sep 1996 09:20:24 GMT",
"version": "v1"
}
] | 2011-09-09 | [
[
"Blanchet",
"L.",
""
]
] | Gravitational radiation reaction forces and balance equations for energy and momenta are investigated to 3/2 post-Newtonian (1.5PN) order beyond the quadrupole approximation, corresponding to the 4PN order in the equations of motion of an isolated system. By matching a post-Newtonian solution for the gravitational fiel... |
0807.2485 | Giovanni Santostasi | Giovanni Santostasi | Upper and lower limits on the Crab pulsar's astrophysical parameters set
from gravitational wave observations by LIGO: braking index and energy
considerations | 6 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Laser Interferometer Gravitational Observatory (LIGO) has recently
reached the end of its fifth science run (S5), having collected more than a
year worth of data. Analysis of the data is still ongoing but a positive
detection of gravitational waves, while possible, is not realistically expected
for most likely so... | [
{
"created": "Wed, 16 Jul 2008 00:35:53 GMT",
"version": "v1"
}
] | 2008-07-17 | [
[
"Santostasi",
"Giovanni",
""
]
] | The Laser Interferometer Gravitational Observatory (LIGO) has recently reached the end of its fifth science run (S5), having collected more than a year worth of data. Analysis of the data is still ongoing but a positive detection of gravitational waves, while possible, is not realistically expected for most likely sour... |
1312.4297 | Alfred Molina | Xavier Ja\'en and Alfred Molina | Homothetic motions and Newtonian cosmology | 14 pages, submitted to GRG | null | 10.1007/s10714-014-1745-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the homothetic motion group. We construct a homothetic covariant
Newtonian gravitation theory which unifies inertial homothetic forces and
gravitational fields. This is achieved through an equivalence principle based
on a local homothetic frame of motion. As a consequence, we can obtain a
coherent Newtoni... | [
{
"created": "Mon, 16 Dec 2013 10:34:35 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Jaén",
"Xavier",
""
],
[
"Molina",
"Alfred",
""
]
] | We consider the homothetic motion group. We construct a homothetic covariant Newtonian gravitation theory which unifies inertial homothetic forces and gravitational fields. This is achieved through an equivalence principle based on a local homothetic frame of motion. As a consequence, we can obtain a coherent Newtonian... |
1112.3048 | Cormac Breen | Cormac Breen and Adrian C. Ottewill | Hadamard Renormalization of the Stress Energy Tensor in a Spherically
Symmetric Black Hole Space-Time with an Application to Lukewarm Black Holes | 17 pages, 8 figures and 2 tables | null | 10.1103/PhysRevD.85.084029 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a quantum field which is in a Hartle-Hawking state propagating in
a spherically symmetric black hole space-time. We calculate the components of
the stress tensor, renormalized using the Hadamard form of the Green's
function, in the exterior region of this space-time. We then specialize these
results to th... | [
{
"created": "Tue, 13 Dec 2011 21:29:53 GMT",
"version": "v1"
}
] | 2013-05-30 | [
[
"Breen",
"Cormac",
""
],
[
"Ottewill",
"Adrian C.",
""
]
] | We consider a quantum field which is in a Hartle-Hawking state propagating in a spherically symmetric black hole space-time. We calculate the components of the stress tensor, renormalized using the Hadamard form of the Green's function, in the exterior region of this space-time. We then specialize these results to the ... |
2408.03410 | Charlie Hoy | Charlie Hoy, Stephen Fairhurst, Ilya Mandel | Precession and higher order multipoles in binary black holes (and lack
thereof) | 13 pages, 5 figures | null | null | LIGO-P2400332 | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | The latest binary black hole population estimates argue for a subpopulation
of unequal component mass binaries with spins that are likely small but
isotropically distributed. This implies a non-zero probability of detecting
spin-induced orbital precession and higher order multipoles moments in the
observed gravitatio... | [
{
"created": "Tue, 6 Aug 2024 19:17:46 GMT",
"version": "v1"
}
] | 2024-08-08 | [
[
"Hoy",
"Charlie",
""
],
[
"Fairhurst",
"Stephen",
""
],
[
"Mandel",
"Ilya",
""
]
] | The latest binary black hole population estimates argue for a subpopulation of unequal component mass binaries with spins that are likely small but isotropically distributed. This implies a non-zero probability of detecting spin-induced orbital precession and higher order multipoles moments in the observed gravitationa... |
2002.06954 | Gerry McKeon Dr. | D.G.C. McKeon | Derivation of Gauge Symmetries in Supergravity with a Cosmological
Constant in 2 + 1 Dimensions | null | null | 10.1139/cjp-2019-0464 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The canonical structure of supergravity with a cosmological constant is
analyzed in 2 + 1 dimensions using the Dirac constraint formalism. The first
class constraints are used to find two Bosonic and one Fermionic gauge
symmetries that satisfy a superalgebra. Provided the cosmological constant is
negative, this novel... | [
{
"created": "Mon, 17 Feb 2020 13:43:03 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"McKeon",
"D. G. C.",
""
]
] | The canonical structure of supergravity with a cosmological constant is analyzed in 2 + 1 dimensions using the Dirac constraint formalism. The first class constraints are used to find two Bosonic and one Fermionic gauge symmetries that satisfy a superalgebra. Provided the cosmological constant is negative, this novel a... |
0908.2077 | Alfonso Zerwekh | Fabrizio Canfora, Alex Giacomini, Alfonso R. Zerwekh | Kaluza-Klein theory in the limit of large number of extra dimensions | LaTeX, 18 pages, 4 figures. Final version accepted for publication in
PRD | Phys.Rev.D80:084039,2009 | 10.1103/PhysRevD.80.084039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Kaluza-Klein compactification in the limit of large number of extra
dimensions is studied. Starting point is the Einstein-Hilbert action plus
cosmological constant in 4+D dimensions. It is shown that in the large D limit
the effective four dimensional cosmological constant is of order 1/D whereas
the size of the ... | [
{
"created": "Fri, 14 Aug 2009 15:23:56 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Oct 2009 12:58:51 GMT",
"version": "v2"
}
] | 2009-11-05 | [
[
"Canfora",
"Fabrizio",
""
],
[
"Giacomini",
"Alex",
""
],
[
"Zerwekh",
"Alfonso R.",
""
]
] | The Kaluza-Klein compactification in the limit of large number of extra dimensions is studied. Starting point is the Einstein-Hilbert action plus cosmological constant in 4+D dimensions. It is shown that in the large D limit the effective four dimensional cosmological constant is of order 1/D whereas the size of the ex... |
1403.0129 | Salvatore Vitale | Salvatore Vitale, Ryan Lynch, John Veitch, Vivien Raymond, Riccardo
Sturani | Measuring the spin of black holes in binary systems using gravitational
waves | 4 figures, Version accepted for publication on PRL | Phys. Rev. Lett. 112, 251101 (2014) | 10.1103/PhysRevLett.112.251101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Compact binary coalescences are the most promising sources of gravitational
waves (GWs) for ground based detectors. Binary systems containing one or two
spinning black holes are particularly interesting due to spin-orbit (and
eventual spin-spin) interactions, and the opportunity of measuring spins
directly through GW... | [
{
"created": "Sat, 1 Mar 2014 22:00:47 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Jun 2014 21:54:41 GMT",
"version": "v2"
}
] | 2014-07-02 | [
[
"Vitale",
"Salvatore",
""
],
[
"Lynch",
"Ryan",
""
],
[
"Veitch",
"John",
""
],
[
"Raymond",
"Vivien",
""
],
[
"Sturani",
"Riccardo",
""
]
] | Compact binary coalescences are the most promising sources of gravitational waves (GWs) for ground based detectors. Binary systems containing one or two spinning black holes are particularly interesting due to spin-orbit (and eventual spin-spin) interactions, and the opportunity of measuring spins directly through GW o... |
1212.5064 | Marc Geiller | Marc Geiller, Karim Noui | A note on the Holst action, the time gauge, and the Barbero-Immirzi
parameter | 22 pages. Published version. Choice of gauge at the begining of
section II.B. clarified. Published in Gen. Rel. Grav. (2013) | Gen. Rel. Grav. 45:1733-1760, 2013 | 10.1007/s10714-013-1552-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note, we review the canonical analysis of the Holst action in the
time gauge, with a special emphasis on the Hamiltonian equations of motion and
the fixation of the Lagrange multipliers. This enables us to identify at the
Hamiltonian level the various components of the covariant torsion tensor, which
have to ... | [
{
"created": "Thu, 20 Dec 2012 14:47:50 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Jun 2013 01:13:50 GMT",
"version": "v2"
}
] | 2014-03-13 | [
[
"Geiller",
"Marc",
""
],
[
"Noui",
"Karim",
""
]
] | In this note, we review the canonical analysis of the Holst action in the time gauge, with a special emphasis on the Hamiltonian equations of motion and the fixation of the Lagrange multipliers. This enables us to identify at the Hamiltonian level the various components of the covariant torsion tensor, which have to be... |
2209.06134 | Serban Cicortas | Serban Cicortas | Extensions of Lorentzian Hawking--Page Solutions with Null
Singularities, Spacelike Singularities, and Cauchy horizons of Taub--NUT type | 52 pages, 14 figures | null | null | null | gr-qc math.AP math.DG | http://creativecommons.org/licenses/by/4.0/ | Starting from the Hawking--Page solutions, we consider the corresponding
Lorentzian cone metrics. These represent cone interior scale-invariant vacuum
solutions, defined in the chronological past of the scaling origin. We extend
the Lorentzian Hawking--Page solutions to the cone exterior region in the class
of $(4+1)... | [
{
"created": "Tue, 13 Sep 2022 16:26:34 GMT",
"version": "v1"
}
] | 2022-09-14 | [
[
"Cicortas",
"Serban",
""
]
] | Starting from the Hawking--Page solutions, we consider the corresponding Lorentzian cone metrics. These represent cone interior scale-invariant vacuum solutions, defined in the chronological past of the scaling origin. We extend the Lorentzian Hawking--Page solutions to the cone exterior region in the class of $(4+1)$-... |
1703.08095 | Emmanuele Battista Dr. | Emmanuele Battista, Angelo Tartaglia, Giampiero Esposito, David
Lucchesi, Matteo Luca Ruggiero, Pavol Valko, Simone Dell' Agnello, Luciano Di
Fiore, Jules Simo, Aniello Grado | Quantum time delay in the gravitational field of a rotating mass | 12 pages, 1 figure | null | 10.1088/1361-6382/aa7f11 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine quantum corrections of time delay arising in the gravitational
field of a spinning oblate source. Low-energy quantum effects occurring in Kerr
geometry are derived within a framework where general relativity is fully seen
as an effective field theory. By employing such a pattern, gravitational
radiative mo... | [
{
"created": "Thu, 23 Mar 2017 14:58:33 GMT",
"version": "v1"
}
] | 2017-07-27 | [
[
"Battista",
"Emmanuele",
""
],
[
"Tartaglia",
"Angelo",
""
],
[
"Esposito",
"Giampiero",
""
],
[
"Lucchesi",
"David",
""
],
[
"Ruggiero",
"Matteo Luca",
""
],
[
"Valko",
"Pavol",
""
],
[
"Agnello",
"Simone Dell... | We examine quantum corrections of time delay arising in the gravitational field of a spinning oblate source. Low-energy quantum effects occurring in Kerr geometry are derived within a framework where general relativity is fully seen as an effective field theory. By employing such a pattern, gravitational radiative modi... |
1608.08798 | Eliahu Cohen | Yakir Aharonov, Eliahu Cohen, Tomer Shushi | Is the Quilted Multiverse Consistent with a Thermodynamic Arrow of Time? | Revised version, accepted to Front. Phys | null | 10.3389/fphy.2018.00004 | null | gr-qc astro-ph.CO quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Theoretical achievements, as well as much controversy, surround multiverse
theory. Various types of multiverses, with an increasing amount of complexity,
were suggested and thoroughly discussed in literature by now. While these types
are very different, they all share the same basic idea: our physical reality
consist... | [
{
"created": "Wed, 31 Aug 2016 10:24:46 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Sep 2016 17:54:33 GMT",
"version": "v2"
},
{
"created": "Wed, 15 Mar 2017 19:26:37 GMT",
"version": "v3"
},
{
"created": "Tue, 27 Jun 2017 08:03:51 GMT",
"version": "v4"
},
{
"c... | 2018-02-08 | [
[
"Aharonov",
"Yakir",
""
],
[
"Cohen",
"Eliahu",
""
],
[
"Shushi",
"Tomer",
""
]
] | Theoretical achievements, as well as much controversy, surround multiverse theory. Various types of multiverses, with an increasing amount of complexity, were suggested and thoroughly discussed in literature by now. While these types are very different, they all share the same basic idea: our physical reality consists ... |
1911.02221 | Puskar Mondal | Puskar Mondal | Attractors of the `n+1' dimensional Einstein-$\Lambda$ flow | null | null | 10.1088/1361-6382/abb9eb | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we prove a global existence theorem for sufficiently small however fully
nonlinear perturbations of a family of background solutions of the $`n+1$'
vacuum Einstein equations in the presence of a positive cosmological constant
$\Lambda$. With the advent of dark energy driven accelerated expansion of the
universe,... | [
{
"created": "Wed, 6 Nov 2019 06:45:30 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Nov 2019 08:18:27 GMT",
"version": "v2"
},
{
"created": "Mon, 25 Nov 2019 05:40:10 GMT",
"version": "v3"
},
{
"created": "Thu, 27 Feb 2020 20:53:36 GMT",
"version": "v4"
},
{
"cre... | 2020-12-02 | [
[
"Mondal",
"Puskar",
""
]
] | Here we prove a global existence theorem for sufficiently small however fully nonlinear perturbations of a family of background solutions of the $`n+1$' vacuum Einstein equations in the presence of a positive cosmological constant $\Lambda$. With the advent of dark energy driven accelerated expansion of the universe, i... |
gr-qc/0603025 | Iver. H. Brevik | Iver Brevik | Crossing of the w=-1 Barrier in Two-Fluid Viscous Modified Gravity | 16 pages latex, no figures | Gen.Rel.Grav.38:1317-1328,2006 | 10.1007/s10714-006-0309-y | null | gr-qc astro-ph hep-th | null | Singularities in the dark energy late universe are discussed, under the
assumption that the Lagrangian contains the Einstein term R plus a modified
gravity term of the form R^\alpha, where \alpha is a constant. It is found,
similarly as in the case of pure Einstein gravity [I. Brevik and O. Gorbunova,
Gen. Rel. Grav.... | [
{
"created": "Wed, 8 Mar 2006 11:40:58 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Brevik",
"Iver",
""
]
] | Singularities in the dark energy late universe are discussed, under the assumption that the Lagrangian contains the Einstein term R plus a modified gravity term of the form R^\alpha, where \alpha is a constant. It is found, similarly as in the case of pure Einstein gravity [I. Brevik and O. Gorbunova, Gen. Rel. Grav. 3... |
1407.8084 | Stephen Green | Stephen R. Green and Robert M. Wald | How well is our universe described by an FLRW model? | Invited contribution to a Classical and Quantum Gravity focus issue
on "Relativistic Effects in Cosmology", edited by Kazuya Koyama; 18 pages, 2
figures. V2: References added and minor wording changes made | Class. Quantum Grav. 31 (2014) 234003 | 10.1088/0264-9381/31/23/234003 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Extremely well! In the $\Lambda$CDM model, the spacetime metric, $g_{ab}$, of
our universe is approximated by an FLRW metric, $g_{ab}^{(0)}$, to about 1 part
in $10^4$ or better on both large and small scales, except in the immediate
vicinity of very strong field objects, such as black holes. However,
derivatives of ... | [
{
"created": "Wed, 30 Jul 2014 15:22:24 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Oct 2014 21:35:47 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Green",
"Stephen R.",
""
],
[
"Wald",
"Robert M.",
""
]
] | Extremely well! In the $\Lambda$CDM model, the spacetime metric, $g_{ab}$, of our universe is approximated by an FLRW metric, $g_{ab}^{(0)}$, to about 1 part in $10^4$ or better on both large and small scales, except in the immediate vicinity of very strong field objects, such as black holes. However, derivatives of $g... |
2104.08093 | Valerio Faraoni | Steve Dussault, Valerio Faraoni, and Andrea Giusti | Analogies between logistic equation and relativistic cosmology | 12 pages, no figures. Invited paper to appear in special issue of
Symmetry | null | null | null | gr-qc physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We develop several formal analogies between the logistic equation and the
spatially homogeneous and isotropic relativistic cosmology described by the
Einstein-Friedmann equations. These analogies produce an effective Lagrangian
and Hamiltonian and new symmetries for the logistic equation.
| [
{
"created": "Fri, 16 Apr 2021 13:04:22 GMT",
"version": "v1"
}
] | 2021-04-19 | [
[
"Dussault",
"Steve",
""
],
[
"Faraoni",
"Valerio",
""
],
[
"Giusti",
"Andrea",
""
]
] | We develop several formal analogies between the logistic equation and the spatially homogeneous and isotropic relativistic cosmology described by the Einstein-Friedmann equations. These analogies produce an effective Lagrangian and Hamiltonian and new symmetries for the logistic equation. |
1207.7097 | David Garrison | David Garrison | Numerical Relativity as a tool for studying the Early Universe | 18 pages, 3 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerical simulations are becoming a more effective tool for conducting
detailed investigations into the evolution of our universe. In this article, we
show how the framework of numerical relativity can be used for studying
cosmological models. The author is working to develop a large-scale simulation
of the dynamica... | [
{
"created": "Mon, 30 Jul 2012 20:52:27 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Dec 2012 19:16:10 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Mar 2014 20:50:59 GMT",
"version": "v3"
},
{
"created": "Wed, 12 Mar 2014 00:28:40 GMT",
"version": "v4"
}
] | 2014-03-13 | [
[
"Garrison",
"David",
""
]
] | Numerical simulations are becoming a more effective tool for conducting detailed investigations into the evolution of our universe. In this article, we show how the framework of numerical relativity can be used for studying cosmological models. The author is working to develop a large-scale simulation of the dynamical ... |
2005.03610 | Neil J. Cornish | Neil J. Cornish and Kevin Shuman | Black Hole Hunting with LISA | 11 pages, 11 figures | Phys. Rev. D 101, 124008 (2020) | 10.1103/PhysRevD.101.124008 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Laser Interferometer Space Antenna (LISA) will be able to detect massive
black hole mergers throughout the visible Universe. These observations will
provide unique information about black hole formation and growth, and the role
black holes play in galaxy evolution. Here we develop several key building
blocks for ... | [
{
"created": "Thu, 7 May 2020 17:08:47 GMT",
"version": "v1"
}
] | 2020-07-01 | [
[
"Cornish",
"Neil J.",
""
],
[
"Shuman",
"Kevin",
""
]
] | The Laser Interferometer Space Antenna (LISA) will be able to detect massive black hole mergers throughout the visible Universe. These observations will provide unique information about black hole formation and growth, and the role black holes play in galaxy evolution. Here we develop several key building blocks for de... |
2103.05082 | Atul Kedia | Grant J. Mathews, In-Saeng Suh, N. Q. Lan, Atul Kedia | Conformally flat, quasi-circular numerical simulations of the
gravitational wave chirp from binary neutron star merger GW170817 | 5 pages, 1 figure | J. Phys. Astron., 9, 204 (2021) | null | null | gr-qc astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The first detection of gravitational waves from the binary neutron star
merger GW170817 by the LIGO-Virgo Collaboration has provided fundamental new
insights into the astrophysical site for r-process nucleosynthesis and on the
nature of dense neutron-star matter. The detected gravitational wave signal
depends upon th... | [
{
"created": "Mon, 8 Mar 2021 21:23:14 GMT",
"version": "v1"
}
] | 2021-03-10 | [
[
"Mathews",
"Grant J.",
""
],
[
"Suh",
"In-Saeng",
""
],
[
"Lan",
"N. Q.",
""
],
[
"Kedia",
"Atul",
""
]
] | The first detection of gravitational waves from the binary neutron star merger GW170817 by the LIGO-Virgo Collaboration has provided fundamental new insights into the astrophysical site for r-process nucleosynthesis and on the nature of dense neutron-star matter. The detected gravitational wave signal depends upon the ... |
1512.07186 | Massimiliano Rinaldi | Massimiliano Rinaldi and Luciano Vanzo | Inflation and reheating in theories with spontaneous scale invariance
symmetry breaking | One appendix added, issues related to scale invariance in the two
frames clarified. References added/updated. Version accepted by PRD | Phys. Rev. D 94, 024009 (2016) | 10.1103/PhysRevD.94.024009 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a scale-invariant model of quadratic gravity with a non-minimally
coupled scalar field. We focus on cosmological solutions and find that scale
invariance is spontaneously broken and a mass scale naturally emerges. Before
the symmetry breaking, the Universe undergoes an inflationary expansion with
nearly the ... | [
{
"created": "Tue, 22 Dec 2015 18:13:00 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jan 2016 10:48:32 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Feb 2016 20:36:40 GMT",
"version": "v3"
},
{
"created": "Wed, 22 Jun 2016 06:53:21 GMT",
"version": "v4"
}
] | 2016-07-13 | [
[
"Rinaldi",
"Massimiliano",
""
],
[
"Vanzo",
"Luciano",
""
]
] | We study a scale-invariant model of quadratic gravity with a non-minimally coupled scalar field. We focus on cosmological solutions and find that scale invariance is spontaneously broken and a mass scale naturally emerges. Before the symmetry breaking, the Universe undergoes an inflationary expansion with nearly the sa... |
1505.01276 | Mustapha Azreg-A\"inou | Mustapha Azreg-A\"inou | Wormhole solutions sourced by fluids, I: Two-fluid charged sources | 12 pages, no figures. Extended version with new title. To appear in
the European Physical Journal C | Eur. Phys. J. C (2016) 76:3 | 10.1140/epjc/s10052-015-3835-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly discuss some of the known and new properties of rotating
geometries that are relevant to this work. We generalize the analytical method
of superposition of fields, known for generating nonrotating solutions, and
apply it to construct massless and massive rotating physical wormholes sourced
by a source-free... | [
{
"created": "Wed, 6 May 2015 08:05:30 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Dec 2015 08:42:30 GMT",
"version": "v2"
}
] | 2016-01-07 | [
[
"Azreg-Aïnou",
"Mustapha",
""
]
] | We briefly discuss some of the known and new properties of rotating geometries that are relevant to this work. We generalize the analytical method of superposition of fields, known for generating nonrotating solutions, and apply it to construct massless and massive rotating physical wormholes sourced by a source-free e... |
1304.5795 | Stefano Liberati | Stefano Liberati | Tests of Lorentz invariance: a 2013 update | 62 pages, no figures. Some extra minor typos corrected. Invited
review for CQG | null | 10.1088/0264-9381/30/13/133001 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present an updated review of Lorentz invariance tests in Effective field
theories (EFT) in the matter as well as in the gravity sector. After a general
discussion of the role of Lorentz invariance and a derivation of its
transformations along the so called von Ignatovski theorem, we present the
dynamical framework... | [
{
"created": "Sun, 21 Apr 2013 20:20:09 GMT",
"version": "v1"
},
{
"created": "Thu, 23 May 2013 19:24:26 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Sep 2013 14:30:12 GMT",
"version": "v3"
}
] | 2015-06-15 | [
[
"Liberati",
"Stefano",
""
]
] | We present an updated review of Lorentz invariance tests in Effective field theories (EFT) in the matter as well as in the gravity sector. After a general discussion of the role of Lorentz invariance and a derivation of its transformations along the so called von Ignatovski theorem, we present the dynamical frameworks ... |
2407.09576 | Paul Frampton | Paul H. Frampton | Avoidance of Schwinger Mechanism in Electromagnetically Accelerating
Universe | 7 pages LaTeX | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In quantum electrodynamics, Schwinger showed in 1951 that in a uniform
electric field the vacuum may spontaneously produce electron-positron pairs.
For this to occur, the required electric field is exceptionally large, $\sim
10^{18}$ N/C. In the Electromagnetically Accelerating Universe (EAU) model,
such an electric ... | [
{
"created": "Thu, 11 Jul 2024 21:27:14 GMT",
"version": "v1"
}
] | 2024-07-16 | [
[
"Frampton",
"Paul H.",
""
]
] | In quantum electrodynamics, Schwinger showed in 1951 that in a uniform electric field the vacuum may spontaneously produce electron-positron pairs. For this to occur, the required electric field is exceptionally large, $\sim 10^{18}$ N/C. In the Electromagnetically Accelerating Universe (EAU) model, such an electric fi... |
0708.2720 | Matthew Anderson | Matthew Anderson, Eric W. Hirschmann, Luis Lehner, Steven L. Liebling,
Patrick M. Motl, David Neilsen, Carlos Palenzuela, Joel E. Tohline | Simulating binary neutron stars: dynamics and gravitational waves | 14 pages, 16 figures. Added one figure from previous version;
corrected typos | Phys.Rev.D77:024006,2008 | 10.1103/PhysRevD.77.024006 | null | gr-qc astro-ph | null | We model two mergers of orbiting binary neutron stars, the first forming a
black hole and the second a differentially rotating neutron star. We extract
gravitational waveforms in the wave zone. Comparisons to a post-Newtonian
analysis allow us to compute the orbital kinematics, including trajectories and
orbital ecce... | [
{
"created": "Mon, 20 Aug 2007 20:11:01 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Jan 2008 18:49:47 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Anderson",
"Matthew",
""
],
[
"Hirschmann",
"Eric W.",
""
],
[
"Lehner",
"Luis",
""
],
[
"Liebling",
"Steven L.",
""
],
[
"Motl",
"Patrick M.",
""
],
[
"Neilsen",
"David",
""
],
[
"Palenzuela",
"Carlos",
"... | We model two mergers of orbiting binary neutron stars, the first forming a black hole and the second a differentially rotating neutron star. We extract gravitational waveforms in the wave zone. Comparisons to a post-Newtonian analysis allow us to compute the orbital kinematics, including trajectories and orbital eccent... |
0912.3632 | Muhammad Sharif | M. Sharif and M. Farasat Shamir | Energy Distribution in f(R) Gravity | 15 pages, accepted for publication in Gen. Relativ. & Grav | Gen.Rel.Grav.42:1557-1569,2010 | 10.1007/s10714-009-0927-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The well-known energy problem is discussed in f(R) theory of gravity. We use
the generalized Landau-Lifshitz energy-momentum complex in the framework of
metric f(R) gravity to evaluate the energy density of plane symmetric solutions
for some general f(R) models. In particular, this quantity is found for some
popular ... | [
{
"created": "Fri, 18 Dec 2009 10:31:24 GMT",
"version": "v1"
}
] | 2014-11-20 | [
[
"Sharif",
"M.",
""
],
[
"Shamir",
"M. Farasat",
""
]
] | The well-known energy problem is discussed in f(R) theory of gravity. We use the generalized Landau-Lifshitz energy-momentum complex in the framework of metric f(R) gravity to evaluate the energy density of plane symmetric solutions for some general f(R) models. In particular, this quantity is found for some popular ch... |
gr-qc/9212005 | null | Harald H. Soleng | Dark Matter and Non-Newtonian Gravity From General Relativity on a
Stringy Background | 10 pages, LATEX | null | null | UPR-0547-T | gr-qc | null | An exact solution of Einstein's field equations for a static spherically
symmetric medium with a radially boost invariant energy-momentum tensor is
presented. In the limit of an equation of state corresponding to a distribution
of radially directed strings there is a $1/r$ correction to Newton's force law.
At large d... | [
{
"created": "Wed, 9 Dec 1992 15:41:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Soleng",
"Harald H.",
""
]
] | An exact solution of Einstein's field equations for a static spherically symmetric medium with a radially boost invariant energy-momentum tensor is presented. In the limit of an equation of state corresponding to a distribution of radially directed strings there is a $1/r$ correction to Newton's force law. At large dis... |
0812.4928 | Jiri Podolsky | Jiri Podolsky, Martin Zofka | General Kundt spacetimes in higher dimensions | 15 pages | Class.Quant.Grav.26:105008,2009 | 10.1088/0264-9381/26/10/105008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a general metric of the Kundt class of spacetimes in higher
dimensions. Geometrically, it admits a non-twisting, non-shearing and
non-expanding geodesic null congruence. We calculate all components of the
curvature and Ricci tensors, without assuming any specific matter content, and
discuss algebraic t... | [
{
"created": "Mon, 29 Dec 2008 15:48:14 GMT",
"version": "v1"
}
] | 2009-04-22 | [
[
"Podolsky",
"Jiri",
""
],
[
"Zofka",
"Martin",
""
]
] | We investigate a general metric of the Kundt class of spacetimes in higher dimensions. Geometrically, it admits a non-twisting, non-shearing and non-expanding geodesic null congruence. We calculate all components of the curvature and Ricci tensors, without assuming any specific matter content, and discuss algebraic typ... |
gr-qc/0607025 | Jose M. Martin-Garcia | David Brizuela, Jose M. Martin-Garcia and Guillermo A. Mena Marugan | Second and higher-order perturbations of a spherical spacetime | Accepted for publication in Physical Review D | Phys.Rev. D74 (2006) 044039 | 10.1103/PhysRevD.74.044039 | null | gr-qc | null | The Gerlach and Sengupta (GS) formalism of coordinate-invariant, first-order,
spherical and nonspherical perturbations around an arbitrary spherical
spacetime is generalized to higher orders, focusing on second-order
perturbation theory. The GS harmonics are generalized to an arbitrary number of
indices on the unit s... | [
{
"created": "Thu, 6 Jul 2006 15:51:15 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Brizuela",
"David",
""
],
[
"Martin-Garcia",
"Jose M.",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
]
] | The Gerlach and Sengupta (GS) formalism of coordinate-invariant, first-order, spherical and nonspherical perturbations around an arbitrary spherical spacetime is generalized to higher orders, focusing on second-order perturbation theory. The GS harmonics are generalized to an arbitrary number of indices on the unit sph... |
gr-qc/9804080 | M. Rainer | U. Kasper, V.R. Gavrilov, V.N. Melnikov, and M. Rainer | Toda chains with type A_m Lie algebra for multidimensional m-component
perfect fluid cosmology | LaTeX, 2 ps figures | Gen.Rel.Grav. 31 (1999) 139-155 | 10.1023/A:1018879807859 | P-Math-98/2 | gr-qc | null | We consider a D-dimensional cosmological model describing an evolution of
Ricci-flat factor spaces, M_1,...M_n (n > 2), in the presence of an m-component
perfect fluid source (n > m > 1). We find characteristic vectors, related to
the matter constants in the barotropic equations of state for fluid components
of all f... | [
{
"created": "Wed, 29 Apr 1998 11:25:50 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Kasper",
"U.",
""
],
[
"Gavrilov",
"V. R.",
""
],
[
"Melnikov",
"V. N.",
""
],
[
"Rainer",
"M.",
""
]
] | We consider a D-dimensional cosmological model describing an evolution of Ricci-flat factor spaces, M_1,...M_n (n > 2), in the presence of an m-component perfect fluid source (n > m > 1). We find characteristic vectors, related to the matter constants in the barotropic equations of state for fluid components of all fac... |
gr-qc/0102078 | Sung-Won Kim | Sung-Won Kim | Scattering problem of scalar wave in wormhole geometry | 6 pages, Revtex, 4 figures | null | null | null | gr-qc | null | In this paper, we study the scattering problem of the scalar wave in the
traversable Lorentzian wormhole geometry. The potentials and Schr\"odinger-like
equations are found in cases of the static uncharged and the charged wormholes.
The differential scattering cross sections are determined by the phase shift of
the a... | [
{
"created": "Sat, 17 Feb 2001 06:19:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kim",
"Sung-Won",
""
]
] | In this paper, we study the scattering problem of the scalar wave in the traversable Lorentzian wormhole geometry. The potentials and Schr\"odinger-like equations are found in cases of the static uncharged and the charged wormholes. The differential scattering cross sections are determined by the phase shift of the asy... |
1708.07427 | Naoki Tsukamoto | Naoki Tsukamoto | Black hole shadow in an asymptotically-flat, stationary, and
axisymmetric spacetime: The Kerr-Newman and rotating regular black holes | 25 pages, 4 figures, minor changes, the title is changed slightly,
accepted for publication in Physical Review D | Phys. Rev. D 97, 064021 (2018) | 10.1103/PhysRevD.97.064021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The shadow of a black hole can be one of the strong observational evidences
for stationary black holes. If we see shadows at the center of galaxies, we
would say whether the observed compact objects are black holes. In this paper,
we consider a formula for the contour of a shadow in an asymptotically-flat,
stationary... | [
{
"created": "Thu, 24 Aug 2017 14:02:37 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Feb 2018 02:33:34 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Mar 2018 07:17:59 GMT",
"version": "v3"
}
] | 2018-03-20 | [
[
"Tsukamoto",
"Naoki",
""
]
] | The shadow of a black hole can be one of the strong observational evidences for stationary black holes. If we see shadows at the center of galaxies, we would say whether the observed compact objects are black holes. In this paper, we consider a formula for the contour of a shadow in an asymptotically-flat, stationary, ... |
1702.00987 | Mohammad Akbar | M. M. Akbar | Embedding FLRW Geometries in Pseudo-Euclidean and Anti-de Sitter Spaces | 17 pages. Minor changes, mostly reflecting journal's editorial style;
one missing reference added | Phys. Rev. D 95, 064058 (2017) | 10.1103/PhysRevD.95.064058 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Contrary to the general consensus in the literature that
Friedmann--Lema\^{i}tre--Robertson--Walker (FLRW) geometries are of embedding
class one (i.e.,\ embeddable in one higher dimensional pseudo-Euclidean
spaces), we show that the most general $k=0$ and $k=-1$ FLRW geometries are of
embedding class two, and their c... | [
{
"created": "Fri, 3 Feb 2017 12:27:24 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Apr 2017 05:09:20 GMT",
"version": "v2"
}
] | 2017-04-05 | [
[
"Akbar",
"M. M.",
""
]
] | Contrary to the general consensus in the literature that Friedmann--Lema\^{i}tre--Robertson--Walker (FLRW) geometries are of embedding class one (i.e.,\ embeddable in one higher dimensional pseudo-Euclidean spaces), we show that the most general $k=0$ and $k=-1$ FLRW geometries are of embedding class two, and their cor... |
1602.08019 | Julian Barbour | Julian Barbour | Arrows of time in unconfined systems | 8 pages, to be published in proceedings to the Time in Physics
conference (ETH Zurich 7-11 September 2015) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Entropy and the second law of thermodynamcs were discovered through study of
the behaviour of gases in confined spaces. The related techniques developed in
the kinetic theory of gases have failed to resolve the apparent conflict
between the time-reversal symmetry of all known laws of nature and the
existence of arrow... | [
{
"created": "Thu, 25 Feb 2016 18:08:39 GMT",
"version": "v1"
}
] | 2016-02-26 | [
[
"Barbour",
"Julian",
""
]
] | Entropy and the second law of thermodynamcs were discovered through study of the behaviour of gases in confined spaces. The related techniques developed in the kinetic theory of gases have failed to resolve the apparent conflict between the time-reversal symmetry of all known laws of nature and the existence of arrows ... |
gr-qc/0307011 | Hrvoje Nikolic | H. Nikolic | Proper co-ordinates of non-inertial observers and rotation | 9 pages, invited contribution to the book "Relativity in Rotating
Frames", editors G. Rizzi and M. L. Ruggiero, Kluwer Academic Publishers (in
preparation). See also http://digilander.libero.it/solciclos/ | null | null | null | gr-qc | null | By proper co-ordinates of non-inertial observers (shortly - proper
non-inertial co-ordinates) we understand the proper co-ordinates of an
arbitrarily moving local observer. After a brief review of the theory of proper
non-inertial co-ordinates, we apply these co-ordinates to discuss the
relativistic effects seen by o... | [
{
"created": "Thu, 3 Jul 2003 08:04:44 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nikolic",
"H.",
""
]
] | By proper co-ordinates of non-inertial observers (shortly - proper non-inertial co-ordinates) we understand the proper co-ordinates of an arbitrarily moving local observer. After a brief review of the theory of proper non-inertial co-ordinates, we apply these co-ordinates to discuss the relativistic effects seen by obs... |
1609.02045 | Zhaoyi Xu | Zhaoyi Xu, Jiancheng Wang | Kerr-Newman-AdS Black Hole In Quintessential Dark Energy | 17 pages, 5 figures | Phys. Rev. D 95, 064015 (2017) | 10.1103/PhysRevD.95.064015 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quintessential dark energy with pressure $p$ and density $\rho$ is related by
equation of state $p=\omega\rho$ with the state parameter $-1<\omega<-1/3$. The
cosmological dark energy influence on black hole spacetime are interesting and
important. In this paper, we study the Kerr-Newman-AdS solutions of the
Einstein-... | [
{
"created": "Tue, 6 Sep 2016 12:49:52 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Sep 2016 14:10:36 GMT",
"version": "v2"
},
{
"created": "Fri, 10 Mar 2017 09:05:41 GMT",
"version": "v3"
}
] | 2017-03-22 | [
[
"Xu",
"Zhaoyi",
""
],
[
"Wang",
"Jiancheng",
""
]
] | Quintessential dark energy with pressure $p$ and density $\rho$ is related by equation of state $p=\omega\rho$ with the state parameter $-1<\omega<-1/3$. The cosmological dark energy influence on black hole spacetime are interesting and important. In this paper, we study the Kerr-Newman-AdS solutions of the Einstein-Ma... |
0802.0530 | Jose' P. S. Lemos | Jos\'e P. S. Lemos, Vilson T. Zanchin | Bonnor stars in d spacetime dimensions | 48 pages, 5 figues, references added, minor changes | Phys.Rev.D77:064003,2008 | 10.1103/PhysRevD.77.064003 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bonnor stars are regular static compact configurations in equilibrium,
composed of an extremal dust fluid, a charged dust fluid where the mass density
is equal to the charge density, joined to an exterior vacuum solution, within
Newtonian gravity and general relativity. In four dimensions, they obey the
corresponding... | [
{
"created": "Mon, 4 Feb 2008 23:02:01 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Jun 2008 17:18:32 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Lemos",
"José P. S.",
""
],
[
"Zanchin",
"Vilson T.",
""
]
] | Bonnor stars are regular static compact configurations in equilibrium, composed of an extremal dust fluid, a charged dust fluid where the mass density is equal to the charge density, joined to an exterior vacuum solution, within Newtonian gravity and general relativity. In four dimensions, they obey the corresponding M... |
2005.03736 | Irene Brito | Irene Brito, J. Carot, E.G.L.R. Vaz | Elastic thick shells in General Relativity | 23 pages, 3 figures | Phys. Rev. D 102, 024081 (2020) | 10.1103/PhysRevD.102.024081 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is shown that exact spherically symmetric solutions to Einstein's Field
Equations exist such that, over an open region of the spacetime, they are
singularity free, satisfy the dominant energy condition, represent elastic
matter with a well defined constitutive function, and are such that elastic
perturbations prop... | [
{
"created": "Thu, 7 May 2020 20:27:14 GMT",
"version": "v1"
}
] | 2020-08-05 | [
[
"Brito",
"Irene",
""
],
[
"Carot",
"J.",
""
],
[
"Vaz",
"E. G. L. R.",
""
]
] | It is shown that exact spherically symmetric solutions to Einstein's Field Equations exist such that, over an open region of the spacetime, they are singularity free, satisfy the dominant energy condition, represent elastic matter with a well defined constitutive function, and are such that elastic perturbations propag... |
gr-qc/0104085 | Xavier Siemens | Xavier Siemens and Ken D. Olum | Gravitational Radiation and the Small-Scale Structure of Cosmic Strings | Replaced with revised version accepted for publication by Nuclear
Physics B | Nucl.Phys.B611:125-145,2001; Erratum-ibid.B645:367,2002 | 10.1016/S0550-3213(01)00353-4 | null | gr-qc astro-ph hep-ph | null | We calculate the gravitational radiation emitted by an infinite cosmic string
with two oppositely moving wave-trains, in the small amplitude approximation.
After comparing our result to the previously studied cases we extend the
results to a new regime where the wavelengths of the opposing wave-trains are
very differ... | [
{
"created": "Wed, 25 Apr 2001 19:09:01 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Aug 2001 15:30:41 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Siemens",
"Xavier",
""
],
[
"Olum",
"Ken D.",
""
]
] | We calculate the gravitational radiation emitted by an infinite cosmic string with two oppositely moving wave-trains, in the small amplitude approximation. After comparing our result to the previously studied cases we extend the results to a new regime where the wavelengths of the opposing wave-trains are very differen... |
0803.2913 | Yun Soo Myung | Yun Soo Myung, Min-Gyun Seo | Origin of holographic dark energy models | 14 pages, version to appear in PLB | Phys.Lett.B671:435-439,2009 | 10.1016/j.physletb.2009.01.001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the origin of holographic dark energy models which were
recently proposed to explain the dark energy-dominated universe. For this
purpose, we introduce the spacetime foam uncertainty of $\delta l \ge l_{\rm
p}^{\alpha}l^{\alpha-1}$. It was argued that the case of $\alpha=2/3$ could
describe the dark en... | [
{
"created": "Thu, 20 Mar 2008 00:14:20 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jan 2009 22:59:54 GMT",
"version": "v2"
}
] | 2009-02-02 | [
[
"Myung",
"Yun Soo",
""
],
[
"Seo",
"Min-Gyun",
""
]
] | We investigate the origin of holographic dark energy models which were recently proposed to explain the dark energy-dominated universe. For this purpose, we introduce the spacetime foam uncertainty of $\delta l \ge l_{\rm p}^{\alpha}l^{\alpha-1}$. It was argued that the case of $\alpha=2/3$ could describe the dark ener... |
gr-qc/9907076 | Unanyan | A. M. Gevorkian, R. A. Gevorkian | Inertia in the Structure of Space-Time | 8 pages | null | null | null | gr-qc | null | In Einstein's equation we suggest a geometrical object substituting the
tensor of energy of impulse and tension. The obtained equation, together with
the equation for external field, makes up the complete problem of mathematical
equations of gravitation, as well as those of inertia. Based on the example of
centrally ... | [
{
"created": "Fri, 23 Jul 1999 19:29:05 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gevorkian",
"A. M.",
""
],
[
"Gevorkian",
"R. A.",
""
]
] | In Einstein's equation we suggest a geometrical object substituting the tensor of energy of impulse and tension. The obtained equation, together with the equation for external field, makes up the complete problem of mathematical equations of gravitation, as well as those of inertia. Based on the example of centrally sy... |
2104.09504 | Ui Ri Mun | Ui Ri Mun | Constant-roll warm inflation and the $\beta$-function approach | 10 pages, 5 figures | null | 10.1103/PhysRevD.103.083527 | null | gr-qc astro-ph.CO hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We propose a new approach to constant-roll warm inflation as a generalization
of constant-roll inflation. Based on the $\beta$-function formalism, it is
shown that constant-roll warm inflation models with a natural end fall into
universality classes defined by three different types of $\beta$-functions,
under the ass... | [
{
"created": "Mon, 19 Apr 2021 02:38:13 GMT",
"version": "v1"
}
] | 2021-05-12 | [
[
"Mun",
"Ui Ri",
""
]
] | We propose a new approach to constant-roll warm inflation as a generalization of constant-roll inflation. Based on the $\beta$-function formalism, it is shown that constant-roll warm inflation models with a natural end fall into universality classes defined by three different types of $\beta$-functions, under the assum... |
1508.06022 | Hamid Reza Sepangi | M. Honardoost, H. Mohseni Sadjadi and H. R. Sepangi | Thawing in a coupled quintessence model | 11 pages, 2 figures | Gen. Rel. Grav. 48 (2016) no.10, 125 | 10.1007/s10714-016-2125-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the thawing model in the framework of coupled quintessence model.
The effective potential has $Z_2$ symmetry which is broken spontaneously when
the dark matter density becomes less than a critical value leading the
quintessence equation of state parameter to deviate from -1. Conditions
required for this p... | [
{
"created": "Tue, 25 Aug 2015 03:49:26 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Sep 2016 02:46:12 GMT",
"version": "v2"
}
] | 2016-09-21 | [
[
"Honardoost",
"M.",
""
],
[
"Sadjadi",
"H. Mohseni",
""
],
[
"Sepangi",
"H. R.",
""
]
] | We consider the thawing model in the framework of coupled quintessence model. The effective potential has $Z_2$ symmetry which is broken spontaneously when the dark matter density becomes less than a critical value leading the quintessence equation of state parameter to deviate from -1. Conditions required for this pro... |
2102.06051 | Peter M\'esz\'aros | Peter M\'esz\'aros | Solid matter with zero shear modulus in flat universe | 20 pages | Class. Quantum Grav. 38 (2021) 165008 | 10.1088/1361-6382/ac11aa | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | For a perfect fluid, the quantity defined through mixed components of the
stress-energy tensor
$\widetilde{w}=(T_{i}^{\phantom{i}i}/3)/(-T_{0}^{\phantom{0}0})$ is independent
on the choice of coordinates only for two values of the pressure to energy
density ratio $w=p/\rho$: for radiation with $w=1/3$, and for dark e... | [
{
"created": "Thu, 11 Feb 2021 14:55:50 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Mar 2021 13:22:34 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Jul 2021 10:42:33 GMT",
"version": "v3"
}
] | 2021-07-23 | [
[
"Mészáros",
"Peter",
""
]
] | For a perfect fluid, the quantity defined through mixed components of the stress-energy tensor $\widetilde{w}=(T_{i}^{\phantom{i}i}/3)/(-T_{0}^{\phantom{0}0})$ is independent on the choice of coordinates only for two values of the pressure to energy density ratio $w=p/\rho$: for radiation with $w=1/3$, and for dark ene... |
1503.07750 | Saugata Mitra | Saugata Mitra, Subhajit Saha, and Subenoy Chakraborty | A Study of Universal Thermodynamics in Brane World Scenario | null | Advances in High Energy Physics 2015, 430764 (2015) | 10.1155/2015/430764 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A study of Universal thermodynamics is done in the frame work of RSII brane
model and DGP brane scenario. The Universe is chosen as FRW model bounded by
apparent or event horizon. Assuming extended Hawking temperature on the
horizon, the unified first law is examined for perfect fluid (with constant
equation of state... | [
{
"created": "Wed, 25 Mar 2015 04:51:13 GMT",
"version": "v1"
}
] | 2016-05-17 | [
[
"Mitra",
"Saugata",
""
],
[
"Saha",
"Subhajit",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | A study of Universal thermodynamics is done in the frame work of RSII brane model and DGP brane scenario. The Universe is chosen as FRW model bounded by apparent or event horizon. Assuming extended Hawking temperature on the horizon, the unified first law is examined for perfect fluid (with constant equation of state) ... |
2302.09085 | Oscar J. C. Dias | Oscar J.C. Dias, Takaaki Ishii, Keiju Murata, Jorge E. Santos and
Benson Way | Superradiance and black resonator strings encounter helical black
strings | 57 pages, 9 figures. v2: Matches published version (minor
improvements) | null | 10.1007/JHEP05(2023)041 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We construct a cohomogeneity-1 helical black string in six-dimensional
Einstein gravity. The helical solution branches from the onset of the
gravitational superradiant instability of the equal-spinning Myers-Perry black
string. The isometry group of the helical black string is $\mathbb{R}_T \times
U(1)_Z \times SU(2)... | [
{
"created": "Fri, 17 Feb 2023 19:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Aug 2023 18:31:15 GMT",
"version": "v2"
}
] | 2023-08-07 | [
[
"Dias",
"Oscar J. C.",
""
],
[
"Ishii",
"Takaaki",
""
],
[
"Murata",
"Keiju",
""
],
[
"Santos",
"Jorge E.",
""
],
[
"Way",
"Benson",
""
]
] | We construct a cohomogeneity-1 helical black string in six-dimensional Einstein gravity. The helical solution branches from the onset of the gravitational superradiant instability of the equal-spinning Myers-Perry black string. The isometry group of the helical black string is $\mathbb{R}_T \times U(1)_Z \times SU(2)$,... |
2001.07920 | Kazem Rezazadeh | K. Rezazadeh, S. Asadzadeh, K. Fahimi, K. Karami, A. Mehrabi | The growth of DM and DE perturbations in DBI non-canonical scalar field
scenario | 33 pages, 13 figures | Annals of Physics 422 (2020) 168299 | 10.1016/j.aop.2020.168299 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the effect of varying sound speed on clustering dark energy in the
Dirac-Born-Infeld (DBI) scenario. The DBI action is included in the class of
$k$-essence models, and it has an important role in describing the effective
degrees of freedom of D-branes in the string theory. In the DBI setup, we take
the anti-... | [
{
"created": "Wed, 22 Jan 2020 09:08:06 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Sep 2020 16:36:50 GMT",
"version": "v2"
}
] | 2020-09-08 | [
[
"Rezazadeh",
"K.",
""
],
[
"Asadzadeh",
"S.",
""
],
[
"Fahimi",
"K.",
""
],
[
"Karami",
"K.",
""
],
[
"Mehrabi",
"A.",
""
]
] | We study the effect of varying sound speed on clustering dark energy in the Dirac-Born-Infeld (DBI) scenario. The DBI action is included in the class of $k$-essence models, and it has an important role in describing the effective degrees of freedom of D-branes in the string theory. In the DBI setup, we take the anti-de... |
gr-qc/9904019 | Mamdouh Wanas | M.I.Wanas | Motion of Spinning Particles in Gravitational Fields | 20 pages Tex file, published in Astrophysics and Space Science,
vol.258, 237, (1998) | Astrophys.Space Sci. 258 (1998) 237 | 10.1023/A:1001747710135 | null | gr-qc quant-ph | null | A new path equation in absolute parallelism (AP) geometry is derived. The
equation is a generalization of three path equations derived in a previous
work. It can be considered as a geodesic equation modified by a torsion term,
whose numerical coefficient jumps by steps of one half. The torsion term is
parametrized us... | [
{
"created": "Wed, 7 Apr 1999 12:16:25 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Wanas",
"M. I.",
""
]
] | A new path equation in absolute parallelism (AP) geometry is derived. The equation is a generalization of three path equations derived in a previous work. It can be considered as a geodesic equation modified by a torsion term, whose numerical coefficient jumps by steps of one half. The torsion term is parametrized usin... |
2404.07757 | Leandro Gomes G | Leandro G. Gomes | Spacetimes with homogeneous and isotropic expansion | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this short note, we define and characterize all the spacetimes admitting
observers to whom the cosmic expansion is homogeneous and isotropic and
interpret their Einstein's equations.
| [
{
"created": "Thu, 11 Apr 2024 14:02:23 GMT",
"version": "v1"
}
] | 2024-04-12 | [
[
"Gomes",
"Leandro G.",
""
]
] | In this short note, we define and characterize all the spacetimes admitting observers to whom the cosmic expansion is homogeneous and isotropic and interpret their Einstein's equations. |
gr-qc/9606092 | Thomas Thiemann | T. Thiemann | A length operator for canonical quantum gravity | 23 pages, Latex | J.Math.Phys. 39 (1998) 3372-3392 | 10.1063/1.532445 | HUTMP-96/B-354 | gr-qc | null | We construct an operator that measures the length of a curve in
four-dimensional Lorentzian vacuum quantum gravity. We work in a representation
in which a $SU(2)$ connection is diagonal and it is therefore surprising that
the operator obtained after regularization is densely defined, does not suffer
from factor order... | [
{
"created": "Sat, 29 Jun 1996 23:40:26 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Thiemann",
"T.",
""
]
] | We construct an operator that measures the length of a curve in four-dimensional Lorentzian vacuum quantum gravity. We work in a representation in which a $SU(2)$ connection is diagonal and it is therefore surprising that the operator obtained after regularization is densely defined, does not suffer from factor orderin... |
1107.2224 | Sergey Cherkas L | S. L. Cherkas and V. L. Kalashnikov | An inhomogeneous toy-model of the quantum gravity with explicitly
evolvable observables | 18 pages | Gen. Rel. Grav. 44 (2012) 3081 | 10.1007/s10714-012-1441-5 | null | gr-qc hep-ph hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An inhomogeneous (1+1)-dimensional model of the quantum gravity is
considered. It is found, that this model corresponds to a string propagating
against some curved background space. The quantization scheme including the
Wheeler-DeWitt equation and the "particle on a sphere" type of the gauge
condition is suggested. I... | [
{
"created": "Tue, 12 Jul 2011 09:39:00 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Jan 2012 09:39:16 GMT",
"version": "v2"
}
] | 2015-05-28 | [
[
"Cherkas",
"S. L.",
""
],
[
"Kalashnikov",
"V. L.",
""
]
] | An inhomogeneous (1+1)-dimensional model of the quantum gravity is considered. It is found, that this model corresponds to a string propagating against some curved background space. The quantization scheme including the Wheeler-DeWitt equation and the "particle on a sphere" type of the gauge condition is suggested. In ... |
1508.01940 | Arundhati Dasgupta | Arundhati Dasgupta | Quantum Field Theory in Accelerated Frames | 28 pages, two figures, clarification and references added | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we re-investigate the Bogoliubov transformations which relate
the Minkowski inertial vacuum to the vacuum of an accelerated observer. We
implement the transformation using a non-unitary operator used in formulations
of irreversible systems by Prigogine. We derive a Lyapunov function which
signifies an i... | [
{
"created": "Sat, 8 Aug 2015 18:29:45 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Jan 2016 20:03:28 GMT",
"version": "v2"
}
] | 2016-01-08 | [
[
"Dasgupta",
"Arundhati",
""
]
] | In this paper we re-investigate the Bogoliubov transformations which relate the Minkowski inertial vacuum to the vacuum of an accelerated observer. We implement the transformation using a non-unitary operator used in formulations of irreversible systems by Prigogine. We derive a Lyapunov function which signifies an irr... |
1401.0588 | Michael Devin | Michael Devin | Musings on Firewalls and the Information Paradox | 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The past year has seen an explosion of new and old ideas about black hole
physics. Prior to the firewall paper, the dominant picture was the thermofield
model apparently implied by ADS/CFT duality\cite{mal2}. While some seek a
narrow responce to Almheiri, Marolf, Polchinski, and Sully,(AMPS)\cite{amps},
there are a n... | [
{
"created": "Fri, 3 Jan 2014 05:49:54 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Mar 2014 19:12:30 GMT",
"version": "v2"
}
] | 2014-03-14 | [
[
"Devin",
"Michael",
""
]
] | The past year has seen an explosion of new and old ideas about black hole physics. Prior to the firewall paper, the dominant picture was the thermofield model apparently implied by ADS/CFT duality\cite{mal2}. While some seek a narrow responce to Almheiri, Marolf, Polchinski, and Sully,(AMPS)\cite{amps}, there are a num... |
gr-qc/9909082 | Herbert Balasin | Herbert Balasin (TU-Wien) | Generalized Kerr Schild metrics and the gravitational field of a
massless particle on the horizon | uses AMS macros | Class.Quant.Grav. 17 (2000) 1913-1920 | 10.1088/0264-9381/17/9/303 | UWThPh 1999-58, TUW 99/20 | gr-qc | null | We investigate the structure of the gravitational field generated by a
massless particle moving on the horizon of an arbitrary (stationary) black
hole. This is done by employing the generalized Kerr-Schild class where we take
the null generators of the horizon as the geodetic null vector-field and a
scalar function w... | [
{
"created": "Mon, 27 Sep 1999 09:58:53 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Balasin",
"Herbert",
"",
"TU-Wien"
]
] | We investigate the structure of the gravitational field generated by a massless particle moving on the horizon of an arbitrary (stationary) black hole. This is done by employing the generalized Kerr-Schild class where we take the null generators of the horizon as the geodetic null vector-field and a scalar function whi... |
1904.09963 | Marius Adrian Oancea | Marius A. Oancea, Claudio F. Paganini, J\'er\'emie Joudioux, Lars
Andersson | An overview of the gravitational spin Hall effect | 49 pages, 2 figures. First version. Comments and suggestions are
welcomed | null | null | null | gr-qc physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In General Relativity, the propagation of electromagnetic waves is usually
described by the vacuum Maxwell's equations on a fixed curved background. In
the limit of infinitely high frequencies, electromagnetic waves can be
localized as point particles, following null geodesics. However, at finite
frequencies, electro... | [
{
"created": "Mon, 22 Apr 2019 17:32:01 GMT",
"version": "v1"
}
] | 2019-04-23 | [
[
"Oancea",
"Marius A.",
""
],
[
"Paganini",
"Claudio F.",
""
],
[
"Joudioux",
"Jérémie",
""
],
[
"Andersson",
"Lars",
""
]
] | In General Relativity, the propagation of electromagnetic waves is usually described by the vacuum Maxwell's equations on a fixed curved background. In the limit of infinitely high frequencies, electromagnetic waves can be localized as point particles, following null geodesics. However, at finite frequencies, electroma... |
0705.2048 | Tanmay Vachaspati | Tanmay Vachaspati | On Constructing Baby Universes and Black Holes | Not an "Honorable Mention" in the Gravity Research Foundation Essay
Competition | null | null | null | gr-qc astro-ph hep-th | null | The creation of spacetimes with horizons is discussed, focussing on baby
universes and black holes as examples. There is a complex interplay of quantum
theory and General Relativity in both cases, leading to consequences for the
future of the universe and the information loss paradox, and to a deeper
understanding of... | [
{
"created": "Tue, 15 May 2007 17:15:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vachaspati",
"Tanmay",
""
]
] | The creation of spacetimes with horizons is discussed, focussing on baby universes and black holes as examples. There is a complex interplay of quantum theory and General Relativity in both cases, leading to consequences for the future of the universe and the information loss paradox, and to a deeper understanding of q... |
gr-qc/9508060 | Remo Garattini | Remo Garattini | Vacuum Energy in Ultralocal metrics for TT tensors with Gaussian Wave
Functionals | Revtex 3.0, preprint, 20 pages, new references included. Some
Comments on the reparametrisation invariance added in the introduction and in
the conclusion | null | null | null | gr-qc hep-th | null | We calculate, in a class of Gauge invariant functionals, by variational
methods, the difference of vacuum energy between two different backgrounds:
Schwarzschild and Flat Space. We perform this evaluation in an Hamiltonian
formulation of Quantum Gravity by standard ''$3+1$'' decomposition. After the
decomposition the... | [
{
"created": "Tue, 29 Aug 1995 21:16:41 GMT",
"version": "v1"
},
{
"created": "Sun, 21 Apr 1996 15:54:43 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Garattini",
"Remo",
""
]
] | We calculate, in a class of Gauge invariant functionals, by variational methods, the difference of vacuum energy between two different backgrounds: Schwarzschild and Flat Space. We perform this evaluation in an Hamiltonian formulation of Quantum Gravity by standard ''$3+1$'' decomposition. After the decomposition the s... |
1705.11091 | Lorenzo Iorio | Lorenzo Iorio | Analytically calculated post-Keplerian range and range-rate
perturbations: the solar Lense-Thirring effect and BepiColombo | LaTex2e, 29 pages, 8 figures, no tables. Matching the version at
press in Monthly Notices of the Royal Astronomical Society (MNRAS) | Mon.Not.Roy.Astron.Soc.476:1811-1825,2018 | 10.1093/mnras/sty351 | null | gr-qc physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analytically calculate the time series for the perturbations
$\Delta\rho(t),~\Delta\dot\rho(t)$ induced by a general disturbing acceleration
$\boldsymbol{A}$ on the mutual range $\rho$ and range-rate $\dot\rho$ of two
test particles $\textrm{A},~\textrm{B}$ orbiting the same spinning body. We
apply it to the gener... | [
{
"created": "Tue, 30 May 2017 10:11:08 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Dec 2017 21:07:52 GMT",
"version": "v2"
},
{
"created": "Fri, 12 Jan 2018 16:40:37 GMT",
"version": "v3"
},
{
"created": "Tue, 23 Jan 2018 15:17:13 GMT",
"version": "v4"
},
{
"c... | 2018-03-19 | [
[
"Iorio",
"Lorenzo",
""
]
] | We analytically calculate the time series for the perturbations $\Delta\rho(t),~\Delta\dot\rho(t)$ induced by a general disturbing acceleration $\boldsymbol{A}$ on the mutual range $\rho$ and range-rate $\dot\rho$ of two test particles $\textrm{A},~\textrm{B}$ orbiting the same spinning body. We apply it to the general... |
gr-qc/0202074 | Plamen petkov Fiziev | Plamen P. Fiziev | Basic Principles of 4D Dilatonic Gravity and Some of Their Consequences
for Cosmology, Astrophysics and Cosmological Constant Problem | 34 pages, 5 figures, LaTeX file, added references, corrected typos | null | null | UTTG-02-02 | gr-qc astro-ph hep-ph hep-th | null | We present a class of simple scalar-tensor models of gravity with one scalar
field (dilaton $\Phi$) and only one unknown function (cosmological potential
$U(\Phi)$). These models might be considered as a stringy inspired ones with
broken SUSY. They have the following basic properties: 1) Positive dilaton
mass, $m_\Ph... | [
{
"created": "Thu, 21 Feb 2002 00:50:06 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Feb 2002 23:07:05 GMT",
"version": "v2"
},
{
"created": "Wed, 27 Feb 2002 04:05:47 GMT",
"version": "v3"
},
{
"created": "Tue, 2 Jul 2002 18:02:39 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Fiziev",
"Plamen P.",
""
]
] | We present a class of simple scalar-tensor models of gravity with one scalar field (dilaton $\Phi$) and only one unknown function (cosmological potential $U(\Phi)$). These models might be considered as a stringy inspired ones with broken SUSY. They have the following basic properties: 1) Positive dilaton mass, $m_\Phi$... |
2207.03690 | Rakshit Vyas | Rakshit P. Vyas and Mihir J. Joshi | New Quantum Spin Perspective and Geometrical Operators of Quantum
Geometry | 5 pages, 1 figure, 1 table | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we propose a new perspective of quantum spin (angular
momentum) in which the Boltzmann constant \(k_{\beta}\), Planck temperature
\(T_{P}\), Planck mass \(m_{P}\) and Planck area \(l_{P}^{2}\) are the integral
part of the total angular momentum \(J\). With the aid of this new perspective,
we modify the... | [
{
"created": "Fri, 8 Jul 2022 05:02:51 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Sep 2022 09:58:00 GMT",
"version": "v2"
}
] | 2022-09-07 | [
[
"Vyas",
"Rakshit P.",
""
],
[
"Joshi",
"Mihir J.",
""
]
] | In this paper, we propose a new perspective of quantum spin (angular momentum) in which the Boltzmann constant \(k_{\beta}\), Planck temperature \(T_{P}\), Planck mass \(m_{P}\) and Planck area \(l_{P}^{2}\) are the integral part of the total angular momentum \(J\). With the aid of this new perspective, we modify the e... |
2405.09703 | Mateo Casariego | Mateo Casariego | Diffeomorphism invariance and general covariance: a pedagogical
introduction | 6 pages, 3 figures, informal style | null | null | null | gr-qc physics.hist-ph | http://creativecommons.org/licenses/by/4.0/ | Diffeomorphism invariance is a feature that gets sometimes highlighted as
something with profound implications in the physics of spacetime. Moreover, it
is often wrongly associated exclusively with General Relativity. The fact that
diffeomorphism invariance and general covariance are used interchangeably does
not hel... | [
{
"created": "Wed, 15 May 2024 21:05:42 GMT",
"version": "v1"
}
] | 2024-05-17 | [
[
"Casariego",
"Mateo",
""
]
] | Diffeomorphism invariance is a feature that gets sometimes highlighted as something with profound implications in the physics of spacetime. Moreover, it is often wrongly associated exclusively with General Relativity. The fact that diffeomorphism invariance and general covariance are used interchangeably does not help.... |
2305.09849 | Tatsuya Yamaoka | Sinya Aoki, Tetsuya Onogi, Tatsuya Yamaoka | Energies and a gravitational charge for massive particles in general
relativity | 17 pages, Reference added, typo corrected | null | null | YITP-23-66, OU-HET-1188 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we investigate relations or differences among various
conserved quantities which involve the matter Energy Momentum Tensor (EMT) in
general relativity. These charges include the energy with Einstein's pseudo
EMT, the generalized Komar integral, or the ADM energy, all of which can be
derived from Noethe... | [
{
"created": "Tue, 16 May 2023 23:37:34 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jul 2023 02:47:38 GMT",
"version": "v2"
}
] | 2023-07-06 | [
[
"Aoki",
"Sinya",
""
],
[
"Onogi",
"Tetsuya",
""
],
[
"Yamaoka",
"Tatsuya",
""
]
] | In this paper, we investigate relations or differences among various conserved quantities which involve the matter Energy Momentum Tensor (EMT) in general relativity. These charges include the energy with Einstein's pseudo EMT, the generalized Komar integral, or the ADM energy, all of which can be derived from Noether'... |
0809.5098 | Gabor Kunstatter | G. Kunstatter (1), J. Louko (2) and J. Ziprick (3) ((1) University of
Winnipeg, (2) University of Nottingham,(3) University of Manitoba) | Polymer quantization, singularity resolution and the 1/r^2 potential | 21 pages, LaTeX including 7 figures. v2: analytic bounds improved;
references added | Phys.Rev.A79:032104,2009 | 10.1103/PhysRevA.79.032104 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a polymer quantization of the -lambda/r^2 potential on the
positive real line and compute numerically the bound state eigenenergies in
terms of the dimensionless coupling constant lambda. The singularity at the
origin is handled in two ways: first, by regularizing the potential and
adopting either symmetri... | [
{
"created": "Tue, 30 Sep 2008 00:45:29 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Mar 2009 17:07:33 GMT",
"version": "v2"
}
] | 2009-05-26 | [
[
"Kunstatter",
"G.",
""
],
[
"Louko",
"J.",
""
],
[
"Ziprick",
"J.",
""
]
] | We present a polymer quantization of the -lambda/r^2 potential on the positive real line and compute numerically the bound state eigenenergies in terms of the dimensionless coupling constant lambda. The singularity at the origin is handled in two ways: first, by regularizing the potential and adopting either symmetric ... |
1212.2290 | Eleni-Alexandra Kontou | Eleni-Alexandra Kontou and Ken D. Olum | Averaged null energy condition in a classical curved background | null | null | 10.1103/PhysRevD.87.064009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Averaged Null Energy Condition (ANEC) states that the integral along a
complete null geodesic of the projection of the stress-energy tensor onto the
tangent vector to the geodesic cannot be negative. Exotic spacetimes, such as
those allow wormholes or the construction of time machines are possible in
general rela... | [
{
"created": "Tue, 11 Dec 2012 03:30:34 GMT",
"version": "v1"
}
] | 2013-03-14 | [
[
"Kontou",
"Eleni-Alexandra",
""
],
[
"Olum",
"Ken D.",
""
]
] | The Averaged Null Energy Condition (ANEC) states that the integral along a complete null geodesic of the projection of the stress-energy tensor onto the tangent vector to the geodesic cannot be negative. Exotic spacetimes, such as those allow wormholes or the construction of time machines are possible in general relati... |
1203.1803 | Mandar Patil | Mandar Patil, Pankaj S. Joshi | Ultra-high energy particle collisions in a regular spacetime without
blackholes or naked singularities | 10 pages, 1 figure, Revised version accepted for publication in Phys.
Rev. D | Phys. Rev. D 86, 044040 (2012) | 10.1103/PhysRevD.86.044040 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate here the particle acceleration and collisions with extremely
large center of mass energies in a perfectly regular spacetime containing
neither singularity nor an event horizon. The ultra-high energy collisions of
particles near the event horizon of extremal Kerr blackhole, and also in many
other exampl... | [
{
"created": "Thu, 8 Mar 2012 14:11:40 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Aug 2012 13:46:19 GMT",
"version": "v2"
}
] | 2012-08-27 | [
[
"Patil",
"Mandar",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | We investigate here the particle acceleration and collisions with extremely large center of mass energies in a perfectly regular spacetime containing neither singularity nor an event horizon. The ultra-high energy collisions of particles near the event horizon of extremal Kerr blackhole, and also in many other examples... |
1402.2385 | Behnam Pourhassan | M. Khurshudyan, E. Chubaryan and B. Pourhassan | Interacting Quintessence Models of Dark Energy | 8 pages, accepted in Int. J. Theor. Phys | Int. J. Theor. Phys. 53 (2014) 2370 | 10.1007/s10773-014-2036-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider two models of quintessence scalar fields with
different potentials. Interaction with generalized cosmic Chaplygin gas is also
investigated. Cosmological parameters are studied and graphical behavior is
analyzed. We find that our model is agree with observational data specially
$\Lambda$CDM m... | [
{
"created": "Tue, 11 Feb 2014 07:07:07 GMT",
"version": "v1"
}
] | 2014-07-08 | [
[
"Khurshudyan",
"M.",
""
],
[
"Chubaryan",
"E.",
""
],
[
"Pourhassan",
"B.",
""
]
] | In this paper we consider two models of quintessence scalar fields with different potentials. Interaction with generalized cosmic Chaplygin gas is also investigated. Cosmological parameters are studied and graphical behavior is analyzed. We find that our model is agree with observational data specially $\Lambda$CDM mod... |
gr-qc/9710124 | Jose Wadih Maluf | J. W. Maluf (Universidade de Brasilia) | Sparling two-forms, the conformal factor and the gravitational energy
density of the teleparallel equivalent of general relativity | 12 pages, Latex file, no figures, to be published in Gen. Rel. Grav | Gen.Rel.Grav. 30 (1998) 413-423 | 10.1023/A:1018806825254 | null | gr-qc | null | It has been shown recently that within the framework of the teleparallel
equivalent of general relativity (TEGR) it is possible to define the energy
density of the gravitational field. The TEGR amounts to an alternative
formulation of Einstein's general relativity, not to an alternative gravity
theory. The localizabi... | [
{
"created": "Tue, 28 Oct 1997 17:16:07 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Maluf",
"J. W.",
"",
"Universidade de Brasilia"
]
] | It has been shown recently that within the framework of the teleparallel equivalent of general relativity (TEGR) it is possible to define the energy density of the gravitational field. The TEGR amounts to an alternative formulation of Einstein's general relativity, not to an alternative gravity theory. The localizabili... |
1712.03730 | Stefano Chinaglia | Aimeric Coll\'eaux, Stefano Chinaglia, Sergio Zerbini | Non-polynomial Lagrangian approach to Regular Black Holes | 39 pages; submitted and accepted for publication in Int. J. Mod.
Phys. D; references added | null | 10.1142/S0218271818300021 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a review on Lagrangian models admitting spherically symmetric
regular black holes, and cosmological bounce solutions. Non-linear
electrodynamics, non-polynomial gravity, and fluid approaches are explained in
details. They consist respectively in a gauge invariant generalization of the
Maxwell Lagrangian, i... | [
{
"created": "Mon, 11 Dec 2017 11:50:41 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Dec 2017 14:43:54 GMT",
"version": "v2"
}
] | 2018-02-28 | [
[
"Colléaux",
"Aimeric",
""
],
[
"Chinaglia",
"Stefano",
""
],
[
"Zerbini",
"Sergio",
""
]
] | We present a review on Lagrangian models admitting spherically symmetric regular black holes, and cosmological bounce solutions. Non-linear electrodynamics, non-polynomial gravity, and fluid approaches are explained in details. They consist respectively in a gauge invariant generalization of the Maxwell Lagrangian, in ... |
1910.13718 | Yan Peng | Yan Peng | Scalarization of compact stars in the scalar-Gauss-Bonnet gravity | 9 pages, 2 figures | JHEP 12(2019)064 | 10.1007/JHEP12(2019)064 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study scalarization of horizonless neutral compact reflecting stars. In
our model, the scalar hair can be induced by the coupling of static scalar
fields to the Gauss-Bonnet invariant. We analytically obtain lower bounds on
the coupling parameter. Below the bound, the static scalar hair cannot form.
And above the ... | [
{
"created": "Wed, 30 Oct 2019 08:39:09 GMT",
"version": "v1"
},
{
"created": "Sun, 24 Nov 2019 08:29:00 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Dec 2019 11:08:09 GMT",
"version": "v3"
}
] | 2019-12-12 | [
[
"Peng",
"Yan",
""
]
] | We study scalarization of horizonless neutral compact reflecting stars. In our model, the scalar hair can be induced by the coupling of static scalar fields to the Gauss-Bonnet invariant. We analytically obtain lower bounds on the coupling parameter. Below the bound, the static scalar hair cannot form. And above the bo... |
2109.03174 | Lavinia Heisenberg | Fabio D'Ambrosio, Shaun D.B. Fell, Lavinia Heisenberg and Simon Kuhn | Black holes in $f(\mathbb Q)$ Gravity | 39 pages, 1 figure | null | 10.1103/PhysRevD.105.024042 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We systematically study the field equations of $f(\mathbb Q)$ gravity for
spherically symmetric and stationary metric-affine spacetimes. Such spacetimes
are described by a metric as well as a flat and torsionless affine connection.
In the Symmetric Teleparallel Equivalent of GR (STEGR), the connection is pure
gauge a... | [
{
"created": "Tue, 7 Sep 2021 16:12:15 GMT",
"version": "v1"
}
] | 2022-02-02 | [
[
"D'Ambrosio",
"Fabio",
""
],
[
"Fell",
"Shaun D. B.",
""
],
[
"Heisenberg",
"Lavinia",
""
],
[
"Kuhn",
"Simon",
""
]
] | We systematically study the field equations of $f(\mathbb Q)$ gravity for spherically symmetric and stationary metric-affine spacetimes. Such spacetimes are described by a metric as well as a flat and torsionless affine connection. In the Symmetric Teleparallel Equivalent of GR (STEGR), the connection is pure gauge and... |
1506.08575 | Frederico Arroja Dr. | Frederico Arroja, Nicola Bartolo, Purnendu Karmakar and Sabino
Matarrese | The two faces of mimetic Horndeski gravity: disformal transformations
and Lagrange multiplier | v1: 14 pages, 1 figure; v2: minor changes and references added,
replaced to match published version | JCAP 1509 (2015) 051 | 10.1088/1475-7516/2015/09/051 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that very general scalar-tensor theories of gravity (including, e.g.,
Horndeski models) are generically invariant under disformal transformations.
However there is a special subset, when the transformation is not invertible,
that yields new equations of motion which are a generalization of the so-called
"mime... | [
{
"created": "Mon, 29 Jun 2015 10:41:37 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Dec 2015 16:56:12 GMT",
"version": "v2"
}
] | 2015-12-31 | [
[
"Arroja",
"Frederico",
""
],
[
"Bartolo",
"Nicola",
""
],
[
"Karmakar",
"Purnendu",
""
],
[
"Matarrese",
"Sabino",
""
]
] | We show that very general scalar-tensor theories of gravity (including, e.g., Horndeski models) are generically invariant under disformal transformations. However there is a special subset, when the transformation is not invertible, that yields new equations of motion which are a generalization of the so-called "mimeti... |
gr-qc/9410029 | null | D. Giulini, C. Kiefer, and H. D. Zeh | Symmetries, superselection rules, and decoherence | 12 pages, LATEX, Report Freiburg THEP-94/30 | Phys.Lett.A199:291-298,1995 | 10.1016/0375-9601(95)00128-P | null | gr-qc hep-th | null | We discuss the applicability of the programme of decoherence -- emergence of
approximate classical behaviour through interaction with the environment -- to
cases where it was suggested that the presence of symmetries would lead to
exact superselection rules. For this discussion it is useful to make a
distinction betw... | [
{
"created": "Fri, 21 Oct 1994 08:43:12 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Giulini",
"D.",
""
],
[
"Kiefer",
"C.",
""
],
[
"Zeh",
"H. D.",
""
]
] | We discuss the applicability of the programme of decoherence -- emergence of approximate classical behaviour through interaction with the environment -- to cases where it was suggested that the presence of symmetries would lead to exact superselection rules. For this discussion it is useful to make a distinction betwee... |
1908.11701 | Ettore Minguzzi | R. A. Hounnonkpe and E. Minguzzi | Globally hyperbolic spacetimes can be defined without the 'causal'
condition | Latex2e, 12 pages. v2: fixed a few typos | Class. Quantum. Grav. 36 (2019) 197001 | 10.1088/1361-6382/ab3f11 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Reasonable spacetimes are non-compact and of dimension larger than two. We
show that these spacetimes are globally hyperbolic if and only if the causal
diamonds are compact. That is, there is no need to impose the causality
condition, as it can be deduced. We also improve the definition of global
hyperbolicity for th... | [
{
"created": "Fri, 30 Aug 2019 12:48:29 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Sep 2019 08:50:27 GMT",
"version": "v2"
}
] | 2019-09-17 | [
[
"Hounnonkpe",
"R. A.",
""
],
[
"Minguzzi",
"E.",
""
]
] | Reasonable spacetimes are non-compact and of dimension larger than two. We show that these spacetimes are globally hyperbolic if and only if the causal diamonds are compact. That is, there is no need to impose the causality condition, as it can be deduced. We also improve the definition of global hyperbolicity for the ... |
2012.14016 | Guillem Dom\`enech | Guillem Dom\`enech and Misao Sasaki | Approximate gauge independence of the induced gravitational wave
spectrum | Typos corrected, matches published version | Phys. Rev. D 103, 063531 (2021) | 10.1103/PhysRevD.103.063531 | YITP-20-163 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves (GWs) induced by scalar curvature fluctuations are an
important source of the cosmological GW background and a crucial counterpart of
the primordial black hole scenario. However, doubts have been cast on the
theoretically predicted induced GW spectrum due to its seeming gauge
dependence. In this p... | [
{
"created": "Sun, 27 Dec 2020 21:29:06 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Apr 2021 09:11:20 GMT",
"version": "v2"
}
] | 2021-04-14 | [
[
"Domènech",
"Guillem",
""
],
[
"Sasaki",
"Misao",
""
]
] | Gravitational waves (GWs) induced by scalar curvature fluctuations are an important source of the cosmological GW background and a crucial counterpart of the primordial black hole scenario. However, doubts have been cast on the theoretically predicted induced GW spectrum due to its seeming gauge dependence. In this pap... |
2110.10127 | Ernesto Contreras | J. Andrade, E. Contreras | Stellar models with like--Tolman IV complexity factor | References updated. Some new references added. arXiv admin note: text
overlap with arXiv:2108.10311 | Eur. Phys. J. C 81, 889 (2021) | 10.1140/epjc/s10052-021-09695-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we construct stellar models ba-\break sed on the complexity
factor as a supplementary condition which allows to close the system of
differential equations arising from the Gravitational Decoupling. The assumed
complexity is a generalization of the one obtained from the well known Tolman
IV solution. We ... | [
{
"created": "Tue, 19 Oct 2021 17:41:35 GMT",
"version": "v1"
}
] | 2021-10-20 | [
[
"Andrade",
"J.",
""
],
[
"Contreras",
"E.",
""
]
] | In this work, we construct stellar models ba-\break sed on the complexity factor as a supplementary condition which allows to close the system of differential equations arising from the Gravitational Decoupling. The assumed complexity is a generalization of the one obtained from the well known Tolman IV solution. We us... |
gr-qc/0011078 | Uchida GENUrsity | Uchida Gen and Misao Sasaki | Radion on the de Sitter brane | 10 pages with no figures, typos corrected, references added, minor
changes in the text | Prog.Theor.Phys.105:591-606,2001 | 10.1143/PTP.105.591 | OU-TAP-150 UTAP-379 | gr-qc astro-ph hep-th | null | The radion on the de Sitter brane is investigated at the linear perturbation
level, using the covariant curvature tensor formalism developed by Shiromizu,
Maeda and Sasaki. It is found that if there is only one de Sitter brane with
positive tension, there is no radion and thus the ordinary Einstein gravity is
recover... | [
{
"created": "Wed, 22 Nov 2000 12:01:07 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Dec 2000 13:51:46 GMT",
"version": "v2"
}
] | 2009-10-09 | [
[
"Gen",
"Uchida",
""
],
[
"Sasaki",
"Misao",
""
]
] | The radion on the de Sitter brane is investigated at the linear perturbation level, using the covariant curvature tensor formalism developed by Shiromizu, Maeda and Sasaki. It is found that if there is only one de Sitter brane with positive tension, there is no radion and thus the ordinary Einstein gravity is recoverd ... |
2011.02860 | Grigoris Panotopoulos | Grigoris Panotopoulos and Angel Rincon | Quasinormal spectra of scale-dependent Schwarzschild-de Sitter black
holes | 10 pages, 3 tables, 3 figures, accepted for publication in Phys. Dark
Univ. arXiv admin note: substantial text overlap with arXiv:2006.11889 | Phys. Dark Univ. 31 (2021) 100743 | 10.1016/j.dark.2020.100743 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the quasinormal spectra for scalar, Dirac and electromagnetic
perturbations of the Schwarzschild-de Sitter geometry in the framework of
scale-dependent gravity, which is one of the current approaches to quantum
gravity. Adopting the widely used WKB semi-classical approximation, we
investigate the impact on... | [
{
"created": "Wed, 4 Nov 2020 16:24:40 GMT",
"version": "v1"
}
] | 2020-11-12 | [
[
"Panotopoulos",
"Grigoris",
""
],
[
"Rincon",
"Angel",
""
]
] | We compute the quasinormal spectra for scalar, Dirac and electromagnetic perturbations of the Schwarzschild-de Sitter geometry in the framework of scale-dependent gravity, which is one of the current approaches to quantum gravity. Adopting the widely used WKB semi-classical approximation, we investigate the impact on t... |
2212.02039 | Abhishek Hegade K R | Abhishek Hegade K R, Elias R. Most, Jorge Noronha, Helvi Witek and
Nicol\'as Yunes | How Do Axisymmetric Black Holes Grow Monopole and Dipole Hair? | v2-matches published version in PRD | null | 10.1103/PhysRevD.107.104047 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamical formation of scalar monopole and dipole hair in scalar
Gauss-Bonnet theory and dynamical Chern-Simons theory. We prove that the
spherically-symmetric mode of the dipole hair is completely determined by the
product of the mass of the spacetime and the value of the monopole hair. We
then show tha... | [
{
"created": "Mon, 5 Dec 2022 05:25:16 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Jun 2023 23:22:57 GMT",
"version": "v2"
}
] | 2023-07-05 | [
[
"R",
"Abhishek Hegade K",
""
],
[
"Most",
"Elias R.",
""
],
[
"Noronha",
"Jorge",
""
],
[
"Witek",
"Helvi",
""
],
[
"Yunes",
"Nicolás",
""
]
] | We study the dynamical formation of scalar monopole and dipole hair in scalar Gauss-Bonnet theory and dynamical Chern-Simons theory. We prove that the spherically-symmetric mode of the dipole hair is completely determined by the product of the mass of the spacetime and the value of the monopole hair. We then show that ... |
1910.12494 | Cosimo Bambi | Menglei Zhou, Dimitry Ayzenberg, Cosimo Bambi, Sourabh Nampalliwar | Modeling uncertainties in X-ray reflection spectroscopy measurements I:
Impact of higher order disk images | 9 pages, 5 figures. v2: refereed version | Phys. Rev. D 101, 043010 (2020) | 10.1103/PhysRevD.101.043010 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There are many simplifications in current relativistic reflection models and
this introduces systematic uncertainties in the measurement of the properties
of the source. In this paper, we study the impact of the radiation crossing the
equatorial plane between the black hole and the inner edge of the accretion
disk; t... | [
{
"created": "Mon, 28 Oct 2019 08:19:47 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Feb 2020 15:19:23 GMT",
"version": "v2"
}
] | 2020-02-17 | [
[
"Zhou",
"Menglei",
""
],
[
"Ayzenberg",
"Dimitry",
""
],
[
"Bambi",
"Cosimo",
""
],
[
"Nampalliwar",
"Sourabh",
""
]
] | There are many simplifications in current relativistic reflection models and this introduces systematic uncertainties in the measurement of the properties of the source. In this paper, we study the impact of the radiation crossing the equatorial plane between the black hole and the inner edge of the accretion disk; tha... |
2309.15246 | Giuseppe Lingetti | Giuseppe Lingetti | Numerical aspects of black hole superradiance | PhD thesis, 134 pages | null | null | null | gr-qc astro-ph.HE math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | In this work we explore a numerical technique, based on the spherical
harmonic decomposition and the discretization of the radial coordinate through
\v{C}eby\v{s}\"ev polynomial interpolation, for the computation of quasi-bound
states of linear massive scalar and vector perturbations in spinning black hole
spacetimes... | [
{
"created": "Tue, 26 Sep 2023 20:19:20 GMT",
"version": "v1"
}
] | 2023-09-28 | [
[
"Lingetti",
"Giuseppe",
""
]
] | In this work we explore a numerical technique, based on the spherical harmonic decomposition and the discretization of the radial coordinate through \v{C}eby\v{s}\"ev polynomial interpolation, for the computation of quasi-bound states of linear massive scalar and vector perturbations in spinning black hole spacetimes i... |
2107.09806 | Jose Wadih Maluf Dr. | F. L. Carneiro, S. C. Ulhoa and J. W. Maluf | On the Black Hole Acceleration in the C-metric Space-time | 24 pages, 4 figures. The article has been revised and simplified; two
paragraphs were added in section 5 regarding the notion and definition of
gravitational energy | Gravit. Cosmol. 28 (2022) 352-361 | 10.1134/S0202289322040077 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider the C-metric as a gravitational field configuration that
describes an accelerating black hole in the presence of a semi-infinite cosmic
string, along the accelerating direction. We adopt the expression for the
gravitational energy-momentum developed in the teleparallel equivalent of
general relativity (TE... | [
{
"created": "Tue, 20 Jul 2021 23:25:33 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Mar 2022 12:07:56 GMT",
"version": "v2"
},
{
"created": "Tue, 29 Nov 2022 17:52:32 GMT",
"version": "v3"
}
] | 2022-11-30 | [
[
"Carneiro",
"F. L.",
""
],
[
"Ulhoa",
"S. C.",
""
],
[
"Maluf",
"J. W.",
""
]
] | We consider the C-metric as a gravitational field configuration that describes an accelerating black hole in the presence of a semi-infinite cosmic string, along the accelerating direction. We adopt the expression for the gravitational energy-momentum developed in the teleparallel equivalent of general relativity (TEGR... |
gr-qc/0101006 | Etesi Gabor | Gabor Etesi (YITP, Japan) | A rigidity theorem for nonvacuum initial data | This is an extended and published version: LaTex, 10 pages, no
figures | Journ. Math. Phys. 43(2) 554-562 (2002) | 10.1063/1.1421422 | null | gr-qc | null | In this note we prove a theorem on non-vacuum initial data for general
relativity. The result presents a ``rigidity phenomenon'' for the extrinsic
curvature, caused by the non-positive scalar curvature.
More precisely, we state that in the case of asymptotically flat non-vacuum
initial data if the metric has everyw... | [
{
"created": "Sun, 31 Dec 2000 07:39:23 GMT",
"version": "v1"
},
{
"created": "Sun, 14 Jan 2001 04:31:24 GMT",
"version": "v2"
},
{
"created": "Mon, 21 Jan 2002 15:39:28 GMT",
"version": "v3"
}
] | 2016-08-31 | [
[
"Etesi",
"Gabor",
"",
"YITP, Japan"
]
] | In this note we prove a theorem on non-vacuum initial data for general relativity. The result presents a ``rigidity phenomenon'' for the extrinsic curvature, caused by the non-positive scalar curvature. More precisely, we state that in the case of asymptotically flat non-vacuum initial data if the metric has everywhere... |
2101.11764 | Yasusada Nambu | Yasusada Nambu and Yuki Osawa | Tripartite Entanglement of Hawking Radiation in Dispersive Model | 24 pages, 18 figures, version to appear in Physical Review D | Phys. Rev. D 103, 125007 (2021) | 10.1103/PhysRevD.103.125007 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate entanglement of the Hawking radiation in a dispersive model
with subluminal dispersion. In this model, feature of the Hawking radiation is
represented by three mode Bogoliubov transformation connecting the in-vacuum
state and the out-state. We obtain the exact form of the tripartite in-vacuum
state whi... | [
{
"created": "Thu, 28 Jan 2021 01:21:12 GMT",
"version": "v1"
},
{
"created": "Mon, 7 Jun 2021 04:57:47 GMT",
"version": "v2"
}
] | 2021-06-16 | [
[
"Nambu",
"Yasusada",
""
],
[
"Osawa",
"Yuki",
""
]
] | We investigate entanglement of the Hawking radiation in a dispersive model with subluminal dispersion. In this model, feature of the Hawking radiation is represented by three mode Bogoliubov transformation connecting the in-vacuum state and the out-state. We obtain the exact form of the tripartite in-vacuum state which... |
1501.03054 | Paul Frampton | Paul Howard Frampton | Cyclic Entropy: An Alternative to Inflationary Cosmology | 14 pages LaTeX. arXiv admin note: text overlap with arXiv:1411.7887 | null | 10.1142/S0217751X15501298 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address how to construct an infinitely cyclic universe model. A major
consideration is to make the entropy cyclic which requires the entropy to be
reset to zero in each cycle expansion to turnaround, to contraction, to bounce,
etc. Here we reset entropy at the turnaround by selecting the introverse
(visible univer... | [
{
"created": "Fri, 9 Jan 2015 22:14:04 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Mar 2015 08:54:18 GMT",
"version": "v2"
}
] | 2015-08-06 | [
[
"Frampton",
"Paul Howard",
""
]
] | We address how to construct an infinitely cyclic universe model. A major consideration is to make the entropy cyclic which requires the entropy to be reset to zero in each cycle expansion to turnaround, to contraction, to bounce, etc. Here we reset entropy at the turnaround by selecting the introverse (visible universe... |
2011.12058 | Sudipta Das | Manisha Banerjee, Sudipta Das, Abdulla Al Mamon, Subhajit Saha,
Kazuharu Bamba | Growth of Perturbations using Lambert$W$ Equation of State | 6 pages, 8 figures | International Journal of Geometric Methods in Modern Physics,
2150139 (2021) | 10.1142/S0219887821501395 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, a novel equation of state (EoS) parameter for dark energy has been
introduced which deals with a special mathematical function, known as the
Lambert$W$ function. In this paper, we study the effect on the growth of
perturbations for the Lambert$W$ dark energy model. We perform the analysis for
two different ... | [
{
"created": "Tue, 24 Nov 2020 12:21:07 GMT",
"version": "v1"
}
] | 2021-06-11 | [
[
"Banerjee",
"Manisha",
""
],
[
"Das",
"Sudipta",
""
],
[
"Mamon",
"Abdulla Al",
""
],
[
"Saha",
"Subhajit",
""
],
[
"Bamba",
"Kazuharu",
""
]
] | Recently, a novel equation of state (EoS) parameter for dark energy has been introduced which deals with a special mathematical function, known as the Lambert$W$ function. In this paper, we study the effect on the growth of perturbations for the Lambert$W$ dark energy model. We perform the analysis for two different ap... |
2203.03861 | Dr. Sudhaker Upadhyay | Dharm Veer Singh, Benoy Kumar Singh and Sudhaker Upadhyay | $4D$ AdS Einstein-Gauss-Bonnet black hole with Yang-Mills field and its
thermodynamics | 13 pages, 12 captioned figures, published in Annals of Physics | Annals of Physics 434 (2021) 168642 | 10.1016/j.aop.2021.168642 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We derive an exact black hole solution for the Einstein-Gauss-Bonnet gravity
with Yang-Mills field in $4D$ AdS spacetime and investigate its thermodynamic
properties to calculate exact expressions for the black hole mass, temperature,
entropy and heat capacity. The thermodynamic quantities get modification in the
pre... | [
{
"created": "Tue, 8 Mar 2022 05:38:21 GMT",
"version": "v1"
}
] | 2022-03-09 | [
[
"Singh",
"Dharm Veer",
""
],
[
"Singh",
"Benoy Kumar",
""
],
[
"Upadhyay",
"Sudhaker",
""
]
] | We derive an exact black hole solution for the Einstein-Gauss-Bonnet gravity with Yang-Mills field in $4D$ AdS spacetime and investigate its thermodynamic properties to calculate exact expressions for the black hole mass, temperature, entropy and heat capacity. The thermodynamic quantities get modification in the prese... |
gr-qc/0012106 | A. K. Guts | Alexander K. Guts, Marina S. Shapovalova | Large fluctuations of time and change of space-time signature | 5 pages, 3 figures, LaTeX, talk given at the International
School-Seminar "Problems of Theoretical Cosmology", Ulyanovsk, 2000 | Grav.Cosmol. 7 (2001) 193-196 | null | null | gr-qc | null | We consider five-dimensional cylindric spacetime $V^5$ with foliation of
codimension ~1. The leaves of this foliation are four-dimensional
"parallel" universes. The metric of five-dimensional spacetime and induced
metrics of four-dimensional universes are flat. The "large" fluctuations of the
5-metric are studied. ... | [
{
"created": "Thu, 28 Dec 2000 19:31:11 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Guts",
"Alexander K.",
""
],
[
"Shapovalova",
"Marina S.",
""
]
] | We consider five-dimensional cylindric spacetime $V^5$ with foliation of codimension ~1. The leaves of this foliation are four-dimensional "parallel" universes. The metric of five-dimensional spacetime and induced metrics of four-dimensional universes are flat. The "large" fluctuations of the 5-metric are studied. Thes... |
2007.09714 | Leah Jenks | Leah Jenks, Kent Yagi, Stephon Alexander | Probing Noncommutative Gravity with Gravitational Wave and Binary Pulsar
Observations | 9 pages, 5 figures | Phys. Rev. D 102, 084022 (2020) | 10.1103/PhysRevD.102.084022 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Noncommutative gravity is a natural method of quantizing spacetime by
promoting the spacetime coordinates themselves to operators which do not
commute. This approach is motivated, for example, from a quantum gravity
perspective, among others. Noncommutative gravity has been tested against the
binary black hole merger... | [
{
"created": "Sun, 19 Jul 2020 16:51:45 GMT",
"version": "v1"
}
] | 2020-10-14 | [
[
"Jenks",
"Leah",
""
],
[
"Yagi",
"Kent",
""
],
[
"Alexander",
"Stephon",
""
]
] | Noncommutative gravity is a natural method of quantizing spacetime by promoting the spacetime coordinates themselves to operators which do not commute. This approach is motivated, for example, from a quantum gravity perspective, among others. Noncommutative gravity has been tested against the binary black hole merger e... |
2101.07673 | Saeed Ullah Khan | Muhammad Zahid, Saeed Ullah Khan, Jingli Ren | Shadow cast and center of mass energy in a charged Gauss-Bonnet-AdS
black hole | 13 Pages, 9 Figures | null | 10.1016/j.cjph.2021.05.003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This work is devoted to the exploration of shadow cast and center of mass
energy in the background of a 4-dimensional charged Gauss-Bonnet AdS black
hole. On investigating particle dynamics, we have examined BH's metric
function. Whereas, with the help of null geodesics, we pursue to calculate the
celestial coordinat... | [
{
"created": "Mon, 18 Jan 2021 17:17:56 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Jan 2021 16:48:57 GMT",
"version": "v2"
}
] | 2021-07-07 | [
[
"Zahid",
"Muhammad",
""
],
[
"Khan",
"Saeed Ullah",
""
],
[
"Ren",
"Jingli",
""
]
] | This work is devoted to the exploration of shadow cast and center of mass energy in the background of a 4-dimensional charged Gauss-Bonnet AdS black hole. On investigating particle dynamics, we have examined BH's metric function. Whereas, with the help of null geodesics, we pursue to calculate the celestial coordinates... |
gr-qc/0310069 | Yuri Obukhov | Yuri N. Obukhov | New solutions in 3D gravity | Revtex, 21 pages, no figures | Phys.Rev. D68 (2003) 124015 | 10.1103/PhysRevD.68.124015 | null | gr-qc hep-th | null | We study gravitational theory in 1+2 spacetime dimensions which is determined
by the Lagrangian constructed as a sum of the Einstein-Hilbert term plus the
two (translational and rotational) gravitational Chern-Simons terms. When the
corresponding coupling constants vanish, we are left with the purely Einstein
theory ... | [
{
"created": "Tue, 14 Oct 2003 10:30:40 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Obukhov",
"Yuri N.",
""
]
] | We study gravitational theory in 1+2 spacetime dimensions which is determined by the Lagrangian constructed as a sum of the Einstein-Hilbert term plus the two (translational and rotational) gravitational Chern-Simons terms. When the corresponding coupling constants vanish, we are left with the purely Einstein theory of... |
2303.14574 | Jean-Philippe Nicolas | Jack Borthwick, Eric Gourgoulhon, Jean-Philippe Nicolas | Peeling at extreme black hole horizons | 33 pages, 3 figures | null | null | null | gr-qc math-ph math.AP math.MP | http://creativecommons.org/licenses/by/4.0/ | The starting point of this work was an intriguing similarity between the
behaviour of fields near a degenerate horizon and near the infinity of an
asymptotically flat spacetime, as revealed by the scattering theory for Dirac
fields in the ``exterior'' region of the extreme Kerr - de Sitter black hole,
developed by on... | [
{
"created": "Sat, 25 Mar 2023 22:09:36 GMT",
"version": "v1"
}
] | 2023-03-28 | [
[
"Borthwick",
"Jack",
""
],
[
"Gourgoulhon",
"Eric",
""
],
[
"Nicolas",
"Jean-Philippe",
""
]
] | The starting point of this work was an intriguing similarity between the behaviour of fields near a degenerate horizon and near the infinity of an asymptotically flat spacetime, as revealed by the scattering theory for Dirac fields in the ``exterior'' region of the extreme Kerr - de Sitter black hole, developed by one ... |
gr-qc/0211071 | Joshua T. Horwood | C. G. Hewitt, J. T. Horwood, J. Wainwright | Asymptotic dynamics of the exceptional Bianchi cosmologies | 15 pages, 6 figures, submitted to Class. Quantum Grav | Class.Quant.Grav. 20 (2003) 1743-1756 | 10.1088/0264-9381/20/9/311 | null | gr-qc | null | In this paper we give, for the first time, a qualitative description of the
asymptotic dynamics of a class of non-tilted spatially homogeneous (SH)
cosmologies, the so-called exceptional Bianchi cosmologies, which are of
Bianchi type VI$_{-1/9}$. This class is of interest for two reasons. Firstly,
it is generic withi... | [
{
"created": "Thu, 21 Nov 2002 18:53:49 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Hewitt",
"C. G.",
""
],
[
"Horwood",
"J. T.",
""
],
[
"Wainwright",
"J.",
""
]
] | In this paper we give, for the first time, a qualitative description of the asymptotic dynamics of a class of non-tilted spatially homogeneous (SH) cosmologies, the so-called exceptional Bianchi cosmologies, which are of Bianchi type VI$_{-1/9}$. This class is of interest for two reasons. Firstly, it is generic within ... |
gr-qc/0012072 | Julio Cesar Fabris | A.B. Batista, J.C. Fabris, S.V.B. Goncalves and J. Tossa | Qualitative analysis of a scalar-tensor theory with exponential
potential | Latex file, 9 pages, 1 figure | Int.J.Mod.Phys. A16 (2001) 4527-4542 | 10.1142/S0217751X0100533X | null | gr-qc | null | A qualitative analysis of a scalar-tensor cosmological model, with an
exponential potential for the scalar field, is performed. The phase diagram for
the flat case is constructed. It is shown that solutions with an initial and
final inflationary behaviour appear. The conditions for which the scenario
favored by super... | [
{
"created": "Tue, 19 Dec 2000 20:17:54 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Batista",
"A. B.",
""
],
[
"Fabris",
"J. C.",
""
],
[
"Goncalves",
"S. V. B.",
""
],
[
"Tossa",
"J.",
""
]
] | A qualitative analysis of a scalar-tensor cosmological model, with an exponential potential for the scalar field, is performed. The phase diagram for the flat case is constructed. It is shown that solutions with an initial and final inflationary behaviour appear. The conditions for which the scenario favored by superno... |
1605.00862 | Ugur Camci | U. Camci, A. Yildirim | Noether gauge symmetry classes for pp-wave spacetimes | 30 pages, 5 tables | Int. J. Geo. Meth. Mod. Phys., vol.12, pp.1550120 (2015) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Noether gauge symmetries of geodesic Lagrangian for the pp-wave
spacetimes are determined in each of the Noether gauge symmetry classes of the
pp-wave spacetimes. It is shown that a type N pp-wave spacetime can admit at
most three Noether gauge symmetry, and furthermore the number of Noether gauge
symmetries turn... | [
{
"created": "Tue, 3 May 2016 12:20:45 GMT",
"version": "v1"
}
] | 2016-05-04 | [
[
"Camci",
"U.",
""
],
[
"Yildirim",
"A.",
""
]
] | The Noether gauge symmetries of geodesic Lagrangian for the pp-wave spacetimes are determined in each of the Noether gauge symmetry classes of the pp-wave spacetimes. It is shown that a type N pp-wave spacetime can admit at most three Noether gauge symmetry, and furthermore the number of Noether gauge symmetries turn o... |
gr-qc/0302101 | Raul Vera | Ruth Lazkoz, Jos\'e M.M. Senovilla, Ra\"ul Vera | Conserved superenergy currents | LaTeX, 19 pages; improved version adding new content to the second
section and some minor corrections | Class.Quant.Grav. 20 (2003) 4135-4152 | 10.1088/0264-9381/20/19/301 | null | gr-qc | null | We exploit once again the analogy between the energy-momentum tensor and the
so-called ``superenergy'' tensors in order to build conserved currents in the
presence of Killing vectors. First of all, we derive the divergence-free
property of the gravitational superenergy currents under very general
circumstances, even ... | [
{
"created": "Tue, 25 Feb 2003 19:05:22 GMT",
"version": "v1"
},
{
"created": "Tue, 15 Apr 2003 10:17:52 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Lazkoz",
"Ruth",
""
],
[
"Senovilla",
"José M. M.",
""
],
[
"Vera",
"Raül",
""
]
] | We exploit once again the analogy between the energy-momentum tensor and the so-called ``superenergy'' tensors in order to build conserved currents in the presence of Killing vectors. First of all, we derive the divergence-free property of the gravitational superenergy currents under very general circumstances, even if... |
gr-qc/0601060 | Muhammad Sharif | M. Sharif and Tasnim Fatima | Energy Distribution associated with Static Axisymmetric Solutions | 18 pages, accepted for publication in Astrophysics and SpaceScience | Astrophys.Space Sci. 302 (2006) 217-224 | 10.1007/s10509-006-9037-8 | null | gr-qc | null | This paper has been addressed to a very old but burning problem of energy in
General Relativity. We evaluate energy and momentum densities for the static
and axisymmetric solutions. This specializes to two metrics, i.e., Erez-Rosen
and the gamma metrics, belonging to the Weyl class. We apply four well-known
prescript... | [
{
"created": "Mon, 16 Jan 2006 11:55:16 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Sharif",
"M.",
""
],
[
"Fatima",
"Tasnim",
""
]
] | This paper has been addressed to a very old but burning problem of energy in General Relativity. We evaluate energy and momentum densities for the static and axisymmetric solutions. This specializes to two metrics, i.e., Erez-Rosen and the gamma metrics, belonging to the Weyl class. We apply four well-known prescriptio... |
gr-qc/0006020 | Edward N. Glass | E.N. Glass and J.P. Krisch (Department of Physics, University of
Michigan, Ann Arbor, Michgan) | Fractal Scales in a Schwarzschild Atmosphere | to appear in Class. Quantum Grav | Class.Quant.Grav. 17 (2000) 2611-2620 | 10.1088/0264-9381/17/14/301 | null | gr-qc | null | Recently, Glass and Krisch have extended the Vaidya radiating metric to
include both a radiation fluid and a string fluid [1999 Class. Quantum Grav.
vol 16, 1175]. Mass diffusion in the extended Schwarzschild atmosphere was
studied. The continuous solutions of classical diffusive transport are believed
to describe th... | [
{
"created": "Tue, 6 Jun 2000 16:39:18 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Glass",
"E. N.",
"",
"Department of Physics, University of\n Michigan, Ann Arbor, Michgan"
],
[
"Krisch",
"J. P.",
"",
"Department of Physics, University of\n Michigan, Ann Arbor, Michgan"
]
] | Recently, Glass and Krisch have extended the Vaidya radiating metric to include both a radiation fluid and a string fluid [1999 Class. Quantum Grav. vol 16, 1175]. Mass diffusion in the extended Schwarzschild atmosphere was studied. The continuous solutions of classical diffusive transport are believed to describe the ... |
1006.3759 | Neil J. Cornish | Joey Shapiro Key and Neil J. Cornish | Characterizing Spinning Black Hole Binaries in Eccentric Orbits with
LISA | 11 pages, 13 figures, references, text and figures updated | Phys.Rev.D83:083001,2011 | 10.1103/PhysRevD.83.083001 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Laser Interferometer Space Antenna (LISA) is designed to detect
gravitational wave signals from astrophysical sources, including those from
coalescing binary systems of compact objects such as black holes. Colliding
galaxies have central black holes that sink to the center of the merged galaxy
and begin to orbit ... | [
{
"created": "Fri, 18 Jun 2010 17:45:43 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Aug 2010 20:56:16 GMT",
"version": "v2"
},
{
"created": "Sat, 12 Feb 2011 14:35:45 GMT",
"version": "v3"
}
] | 2011-04-22 | [
[
"Key",
"Joey Shapiro",
""
],
[
"Cornish",
"Neil J.",
""
]
] | The Laser Interferometer Space Antenna (LISA) is designed to detect gravitational wave signals from astrophysical sources, including those from coalescing binary systems of compact objects such as black holes. Colliding galaxies have central black holes that sink to the center of the merged galaxy and begin to orbit on... |
1803.06346 | Tyler Knowles | Tyler D. Knowles, Caleb Devine, David A. Buch, Serdar A. Bilgili,
Thomas R. Adams, Zachariah B. Etienne, Sean T. McWilliams | Improving performance of SEOBNRv3 by $\sim$300x | 16 pages, 1 figure, 9 tables; updated to clarify science background
and fix typos | Knowles et al 2018 Class. Quantum Grav.
https://doi.org/10.1088/1361-6382/aacb8c | 10.1088/1361-6382/aacb8c | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When a gravitational wave is detected by Advanced LIGO/Virgo, sophisticated
parameter estimation (PE) pipelines spring into action. These pipelines
leverage approximants to generate large numbers of theoretical gravitational
waveform predictions to characterize the detected signal. One of the most
accurate and physic... | [
{
"created": "Fri, 16 Mar 2018 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jul 2018 14:10:40 GMT",
"version": "v2"
}
] | 2018-07-03 | [
[
"Knowles",
"Tyler D.",
""
],
[
"Devine",
"Caleb",
""
],
[
"Buch",
"David A.",
""
],
[
"Bilgili",
"Serdar A.",
""
],
[
"Adams",
"Thomas R.",
""
],
[
"Etienne",
"Zachariah B.",
""
],
[
"McWilliams",
"Sean T.",
... | When a gravitational wave is detected by Advanced LIGO/Virgo, sophisticated parameter estimation (PE) pipelines spring into action. These pipelines leverage approximants to generate large numbers of theoretical gravitational waveform predictions to characterize the detected signal. One of the most accurate and physical... |
1007.4612 | Ujjal Debnath | Ujjal Debnath | Thermodynamics in Quasi-Spherical Szekeres Space-Time | 8 pages | Europhys.Lett.94:29001,2011 | 10.1209/0295-5075/94/29001 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have considered that the universe is the inhomogeneous $(n+2)$ dimensional
quasi-spherical Szekeres space-time model. We consider the universe as a
thermodynamical system with the horizon surface as a boundary of the system. To
study the generalized second law (GSL) of thermodynamics through the universe,
we have ... | [
{
"created": "Tue, 27 Jul 2010 03:49:08 GMT",
"version": "v1"
}
] | 2011-04-20 | [
[
"Debnath",
"Ujjal",
""
]
] | We have considered that the universe is the inhomogeneous $(n+2)$ dimensional quasi-spherical Szekeres space-time model. We consider the universe as a thermodynamical system with the horizon surface as a boundary of the system. To study the generalized second law (GSL) of thermodynamics through the universe, we have as... |
gr-qc/0112030 | Hwei-Jang Yo | H.J. Yo and J.M. Nester | Hamiltonian Analysis of Poincar\'e Gauge Theory: Higher Spin Modes | 30 pages, submitted to Int. J. Mod. Phys. D | Int.J.Mod.Phys. D11 (2002) 747-780 | 10.1142/S0218271802001998 | null | gr-qc | null | We examine several higher spin modes of the Poincar\'e gauge theory (PGT) of
gravity using the Hamiltonian analysis. The appearance of certain undesirable
effects due to non-linear constraints in the Hamiltonian analysis are used as a
test. We find that the phenomena of field activation and constraint bifurcation
bot... | [
{
"created": "Fri, 14 Dec 2001 07:13:31 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Yo",
"H. J.",
""
],
[
"Nester",
"J. M.",
""
]
] | We examine several higher spin modes of the Poincar\'e gauge theory (PGT) of gravity using the Hamiltonian analysis. The appearance of certain undesirable effects due to non-linear constraints in the Hamiltonian analysis are used as a test. We find that the phenomena of field activation and constraint bifurcation both ... |
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