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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0910.5236 | Jos\'e Cleriston Campos de Souza | Elcio Abdalla, L. Raul Abramo, Jose C. C. de Souza | Signature of the interaction between dark energy and dark matter in
observations | 13 pages, 3 figures; matches PRD published version | Phys.Rev.D82:023508,2010 | 10.1103/PhysRevD.82.023508 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the effect of an interaction between dark energy and dark
matter upon the dynamics of galaxy clusters. This effect is computed through
the Layser-Irvine equation, which describes how an astrophysical system reaches
virial equilibrium and was modified to include the dark interactions. Using
observationa... | [
{
"created": "Tue, 27 Oct 2009 20:37:10 GMT",
"version": "v1"
},
{
"created": "Tue, 11 May 2010 18:34:10 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Jul 2010 16:01:02 GMT",
"version": "v3"
}
] | 2014-11-20 | [
[
"Abdalla",
"Elcio",
""
],
[
"Abramo",
"L. Raul",
""
],
[
"de Souza",
"Jose C. C.",
""
]
] | We investigate the effect of an interaction between dark energy and dark matter upon the dynamics of galaxy clusters. This effect is computed through the Layser-Irvine equation, which describes how an astrophysical system reaches virial equilibrium and was modified to include the dark interactions. Using observational ... |
1412.5131 | Marcony Silva Cunha | C. R. Muniz, M. S. Cunha, R. N. Costa Filho, V. B. Bezerra | Some remarks on Relativistic Diffusion and the Spectral Dimension
Criterion | 4 pages, no figures | Phys.Rev.D91:027501,2015 | 10.1103/PhysRevD.91.027501 | null | gr-qc cond-mat.other hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spectral dimension $d_s$ for high energies is calculated using the
Relativistic Schr\"{o}dinger Equation Analytically Continued (RSEAC) instead of
the so-called Telegraph's Equation (TE), in both ultraviolet (UV) and infrared
(IR) regimens. Regarding the TE, the recent literature presents difficulties
related to ... | [
{
"created": "Tue, 16 Dec 2014 19:17:50 GMT",
"version": "v1"
}
] | 2015-01-28 | [
[
"Muniz",
"C. R.",
""
],
[
"Cunha",
"M. S.",
""
],
[
"Filho",
"R. N. Costa",
""
],
[
"Bezerra",
"V. B.",
""
]
] | The spectral dimension $d_s$ for high energies is calculated using the Relativistic Schr\"{o}dinger Equation Analytically Continued (RSEAC) instead of the so-called Telegraph's Equation (TE), in both ultraviolet (UV) and infrared (IR) regimens. Regarding the TE, the recent literature presents difficulties related to it... |
1210.7969 | Seth Hopper | Seth Hopper, Charles R. Evans | Metric perturbations from eccentric orbits on a Schwarzschild black
hole: I. Odd-parity Regge-Wheeler to Lorenz gauge transformation and two new
methods to circumvent the Gibbs phenomenon | 17 pages, 9 figures, Updated with one modified figure and minor
changes to the text. Added DOI and Journal reference | Phys. Rev. D 87, 064008 (2013) | 10.1103/PhysRevD.87.064008 | AEI-2012-190 | gr-qc physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the odd-parity, radiative ($\ell \ge 2$) parts of the metric
perturbation in Lorenz gauge caused by a small compact object in eccentric
orbit about a Schwarzschild black hole. The Lorenz gauge solution is found via
gauge transformation from a corresponding one in Regge-Wheeler gauge. Like the
Regge-Wheel... | [
{
"created": "Tue, 30 Oct 2012 11:32:11 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Mar 2013 10:10:24 GMT",
"version": "v2"
}
] | 2013-03-20 | [
[
"Hopper",
"Seth",
""
],
[
"Evans",
"Charles R.",
""
]
] | We calculate the odd-parity, radiative ($\ell \ge 2$) parts of the metric perturbation in Lorenz gauge caused by a small compact object in eccentric orbit about a Schwarzschild black hole. The Lorenz gauge solution is found via gauge transformation from a corresponding one in Regge-Wheeler gauge. Like the Regge-Wheeler... |
gr-qc/9405072 | Haret Rosu | H.C. Rosu | Black hole thermal effects in the scattering picture | 4 pages, LaTex, revised and updated | null | null | null | gr-qc | null | In the scattering picture, thermal radiation effects may be associated with
the `above barrier' reflection coefficient, which comes into play because of
complex turning points. This note contains several general remarks on the
application of the above statement to Schwarzschild black hole radiance
| [
{
"created": "Mon, 30 May 1994 18:17:00 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Jun 1999 02:53:48 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Rosu",
"H. C.",
""
]
] | In the scattering picture, thermal radiation effects may be associated with the `above barrier' reflection coefficient, which comes into play because of complex turning points. This note contains several general remarks on the application of the above statement to Schwarzschild black hole radiance |
2207.02199 | Vitor Barroso Silveira | Vitor S. Barroso, August Geelmuyden, Zack Fifer, Sebastian Erne,
Anastasios Avgoustidis, Richard J. A. Hill, and Silke Weinfurtner | Primary thermalisation mechanism of Early Universe observed from
Faraday-wave scattering on liquid-liquid interfaces | null | null | null | null | gr-qc astro-ph.CO physics.flu-dyn | http://creativecommons.org/licenses/by/4.0/ | For the past two hundred years, parametric instabilities have been studied in
various physical systems, such as fluids, mechanical devices and even
inflationary cosmology. It was not until a few decades ago that this
subharmonic unstable response arose as a central mechanism for the
thermalisation of the Early Univer... | [
{
"created": "Tue, 5 Jul 2022 17:58:05 GMT",
"version": "v1"
}
] | 2022-07-06 | [
[
"Barroso",
"Vitor S.",
""
],
[
"Geelmuyden",
"August",
""
],
[
"Fifer",
"Zack",
""
],
[
"Erne",
"Sebastian",
""
],
[
"Avgoustidis",
"Anastasios",
""
],
[
"Hill",
"Richard J. A.",
""
],
[
"Weinfurtner",
"Silke",... | For the past two hundred years, parametric instabilities have been studied in various physical systems, such as fluids, mechanical devices and even inflationary cosmology. It was not until a few decades ago that this subharmonic unstable response arose as a central mechanism for the thermalisation of the Early Universe... |
2012.08363 | J\'er\'emie Joudioux | Lars Andersson, J\'er\'emie Joudioux, Marius A. Oancea and Ayush Raj | Propagation of polarized gravitational waves | null | Phys. Rev. D 103, 044053 (2021) | 10.1103/PhysRevD.103.044053 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The propagation of high-frequency gravitational waves can be analyzed using
the geometrical optics approximation. In the case of large but finite
frequencies, the geometrical optics approximation is no longer accurate, and
polarization-dependent corrections at first order in wavelength modify the
propagation of gravi... | [
{
"created": "Tue, 15 Dec 2020 15:26:50 GMT",
"version": "v1"
}
] | 2021-03-03 | [
[
"Andersson",
"Lars",
""
],
[
"Joudioux",
"Jérémie",
""
],
[
"Oancea",
"Marius A.",
""
],
[
"Raj",
"Ayush",
""
]
] | The propagation of high-frequency gravitational waves can be analyzed using the geometrical optics approximation. In the case of large but finite frequencies, the geometrical optics approximation is no longer accurate, and polarization-dependent corrections at first order in wavelength modify the propagation of gravita... |
gr-qc/0601091 | Yosef Zlochower | M. Campanelli, C. O. Lousto, Y. Zlochower | The last orbit of binary black holes | 5 pages, 5 figures, revtex4 | Phys.Rev.D73:061501,2006 | 10.1103/PhysRevD.73.061501 | null | gr-qc | null | We have used our new technique for fully numerical evolutions of orbiting
black-hole binaries without excision to model the last orbit and merger of an
equal-mass black-hole system. We track the trajectories of the individual
apparent horizons and find that the binary completed approximately one and a
third orbits be... | [
{
"created": "Mon, 23 Jan 2006 02:56:47 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Campanelli",
"M.",
""
],
[
"Lousto",
"C. O.",
""
],
[
"Zlochower",
"Y.",
""
]
] | We have used our new technique for fully numerical evolutions of orbiting black-hole binaries without excision to model the last orbit and merger of an equal-mass black-hole system. We track the trajectories of the individual apparent horizons and find that the binary completed approximately one and a third orbits befo... |
gr-qc/0204094 | Federico Piazza | Thibault Damour, Federico Piazza, Gabriele Veneziano | Runaway dilaton and equivalence principle violations | 4 pages, minor changes | Phys.Rev.Lett. 89 (2002) 081601 | 10.1103/PhysRevLett.89.081601 | null | gr-qc astro-ph hep-ph hep-th | null | In a recently proposed scenario, where the dilaton decouples while
cosmologically attracted towards infinite bare string coupling, its residual
interactions can be related to the amplitude of density fluctuations generated
during inflation, and are large enough to be detectable through a modest
improvement on present... | [
{
"created": "Tue, 30 Apr 2002 18:04:16 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Aug 2002 08:25:38 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Damour",
"Thibault",
""
],
[
"Piazza",
"Federico",
""
],
[
"Veneziano",
"Gabriele",
""
]
] | In a recently proposed scenario, where the dilaton decouples while cosmologically attracted towards infinite bare string coupling, its residual interactions can be related to the amplitude of density fluctuations generated during inflation, and are large enough to be detectable through a modest improvement on present t... |
gr-qc/0505044 | Ramin G. Daghigh | Ramin G. Daghigh and Gabor Kunstatter | Highly Damped Quasinormal Modes of Generic Single Horizon Black Holes | 21 pages, 4 figures | Class.Quant.Grav. 22 (2005) 4113-4128 | 10.1088/0264-9381/22/19/020 | null | gr-qc | null | We calculate analytically the highly damped quasinormal mode spectra of
generic single-horizon black holes using the rigorous WKB techniques of
Andersson and Howls\cite{Andersson}. We thereby provide a firm foundation for
previous analysis, and point out some of their possible limitations. The
numerical coefficient i... | [
{
"created": "Tue, 10 May 2005 19:41:15 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Daghigh",
"Ramin G.",
""
],
[
"Kunstatter",
"Gabor",
""
]
] | We calculate analytically the highly damped quasinormal mode spectra of generic single-horizon black holes using the rigorous WKB techniques of Andersson and Howls\cite{Andersson}. We thereby provide a firm foundation for previous analysis, and point out some of their possible limitations. The numerical coefficient in ... |
0803.4484 | Martin Bojowald | Martin Bojowald and Reza Tavakol | Recollapsing quantum cosmologies and the question of entropy | 23 pages, 2 figures | Phys.Rev.D78:023515,2008 | 10.1103/PhysRevD.78.023515 | IGC-08/3-4 | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recollapsing homogeneous and isotropic models present one of the key
ingredients for cyclic scenarios. This is considered here within a quantum
cosmological framework in presence of a free scalar field with, in turn, a
negative cosmological constant and spatial curvature. Effective equations shed
light on the quantum... | [
{
"created": "Mon, 31 Mar 2008 18:43:18 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bojowald",
"Martin",
""
],
[
"Tavakol",
"Reza",
""
]
] | Recollapsing homogeneous and isotropic models present one of the key ingredients for cyclic scenarios. This is considered here within a quantum cosmological framework in presence of a free scalar field with, in turn, a negative cosmological constant and spatial curvature. Effective equations shed light on the quantum d... |
gr-qc/9801041 | Vitaly Melnikov | V.D. Ivashchuk and V.N. Melnikov | Multidimensional Gravity with p-branes | 3 pages, Latex. To appear in Proceedings of MG8 Meeting, Jerusalem,
1997 (World Scientific, Singapore) | null | null | null | gr-qc | null | A short review of recent results of authors on sigma-model approach in
multidimensional gravity with p-branes is presented.
| [
{
"created": "Tue, 13 Jan 1998 09:38:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ivashchuk",
"V. D.",
""
],
[
"Melnikov",
"V. N.",
""
]
] | A short review of recent results of authors on sigma-model approach in multidimensional gravity with p-branes is presented. |
2402.03911 | Audrey Trova | Kris Schroven, Vladimir Karas, Jiri Horak, Audrey Trova and Eva
Hackmann | Stability of Rotating, Charged Fluids: Generalization of the Hoiland
Conditions in Newtonian Non-conductive Case | 14 pages, 3 figures | Physical Review D 109, 043047 (2024) | 10.1103/PhysRevD.109.043047 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the conditions for stability of electrically charged, non-conductive
perfect fluid tori with respect to linear perturbations. To this end we employ
Lagrangian perturbation formalism and we assume a system where the fluid orbits
a central body. Gravitational field of the latter is described in the Newtonian
f... | [
{
"created": "Tue, 6 Feb 2024 11:23:03 GMT",
"version": "v1"
}
] | 2024-04-15 | [
[
"Schroven",
"Kris",
""
],
[
"Karas",
"Vladimir",
""
],
[
"Horak",
"Jiri",
""
],
[
"Trova",
"Audrey",
""
],
[
"Hackmann",
"Eva",
""
]
] | We study the conditions for stability of electrically charged, non-conductive perfect fluid tori with respect to linear perturbations. To this end we employ Lagrangian perturbation formalism and we assume a system where the fluid orbits a central body. Gravitational field of the latter is described in the Newtonian fra... |
gr-qc/9709072 | Hans-Juergen Schmidt | H.-J. Schmidt | Answer to question Nr. 55 | 3 pages, LaTeX, 2 figures, Am. J. Phys. in print | Am.J.Phys. 65 (1997) 1038 | 10.1119/1.18735 | Preprint UNIPO-MATH-97-September-26 | gr-qc | null | We answer to question Nr. 55 [Are there pictorial examples that distinguish
covariant and contravariant vectors ?] posed by D. Neuenschwander, Am. J. Phys.
65 (1), 11 (1997)
| [
{
"created": "Fri, 26 Sep 1997 16:28:22 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Schmidt",
"H. -J.",
""
]
] | We answer to question Nr. 55 [Are there pictorial examples that distinguish covariant and contravariant vectors ?] posed by D. Neuenschwander, Am. J. Phys. 65 (1), 11 (1997) |
gr-qc/9412032 | Jerzy Kowalski-Glikman | J. Kowalski-Glikman | Classical and Quantum in Cosmology | null | null | null | null | gr-qc hep-th | null | There are several regimes in chaotic inflationary cosmology where some part
of the system is classical and some other quantum. I describe how to deal with
such systems and how to disentangle their dynamics into classical behaviour and
quantum corrections. I also discuss the conditions for quantum corrections to
be sm... | [
{
"created": "Sat, 10 Dec 1994 13:54:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kowalski-Glikman",
"J.",
""
]
] | There are several regimes in chaotic inflationary cosmology where some part of the system is classical and some other quantum. I describe how to deal with such systems and how to disentangle their dynamics into classical behaviour and quantum corrections. I also discuss the conditions for quantum corrections to be smal... |
1705.07979 | Eugen Radu | Carlos Herdeiro, Vanush Paturyan, Eugen Radu and D. H. Tchrakian | Reissner-Nordstr\"om black holes with non-Abelian hair | 16 pages, 4 figures; v2: typos corrected, minor changes, references
added; version accepted for publication in PLB | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider $d\geqslant 4$ Einstein--(extended-)Yang-Mills theory, where the
gauge sector is augmented by higher order terms. Linearizing the (extended)
Yang-Mills equations on the background of the electric Reissner-Nordstr\"om
(RN) black hole, we show the existence of normalizable zero modes, dubbed
non-Abelian mag... | [
{
"created": "Mon, 22 May 2017 20:12:38 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jun 2017 20:13:08 GMT",
"version": "v2"
}
] | 2017-06-21 | [
[
"Herdeiro",
"Carlos",
""
],
[
"Paturyan",
"Vanush",
""
],
[
"Radu",
"Eugen",
""
],
[
"Tchrakian",
"D. H.",
""
]
] | We consider $d\geqslant 4$ Einstein--(extended-)Yang-Mills theory, where the gauge sector is augmented by higher order terms. Linearizing the (extended) Yang-Mills equations on the background of the electric Reissner-Nordstr\"om (RN) black hole, we show the existence of normalizable zero modes, dubbed non-Abelian magne... |
1307.1590 | Olivier Minazzoli | Olivier Minazzoli | Conservation laws in theories with universal gravity/matter coupling | 6 pages, accepted for publication in Phys. Rev. D | Phys. Rev. D 88, 027506 (2013) | 10.1103/PhysRevD.88.027506 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the conservation laws of different type of
particles in theories with a universal gravity/matter coupling. The result
brings new insights about previous studies on universal gravity/matter
theories. Especially, the paper demonstrates that for perfect fluids, there is
an equivalence betwe... | [
{
"created": "Fri, 5 Jul 2013 12:15:39 GMT",
"version": "v1"
}
] | 2013-09-03 | [
[
"Minazzoli",
"Olivier",
""
]
] | In this paper, we investigate the conservation laws of different type of particles in theories with a universal gravity/matter coupling. The result brings new insights about previous studies on universal gravity/matter theories. Especially, the paper demonstrates that for perfect fluids, there is an equivalence between... |
1902.05925 | Muhammad Sharif | M. Sharif and Ayesha Ikram | Cosmic Evolution of Holographic Dark Energy in f(\mathcal{G},T) Gravity | 18 pages, 5 figures | Ad. High Energy Phys. 2019(2019)1873804 | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this paper is to analyze the cosmological evolution of holographic
dark energy in $f(\mathcal{G},T)$ gravity ($\mathcal{G}$ and $T$ represent the
Gauss-Bonnet invariant and trace of the energy-momentum tensor, respectively).
We reconstruct $f(\mathcal{G},T)$ model through correspondence scheme using
power-... | [
{
"created": "Thu, 14 Feb 2019 09:48:05 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Apr 2019 04:44:59 GMT",
"version": "v2"
}
] | 2019-04-03 | [
[
"Sharif",
"M.",
""
],
[
"Ikram",
"Ayesha",
""
]
] | The aim of this paper is to analyze the cosmological evolution of holographic dark energy in $f(\mathcal{G},T)$ gravity ($\mathcal{G}$ and $T$ represent the Gauss-Bonnet invariant and trace of the energy-momentum tensor, respectively). We reconstruct $f(\mathcal{G},T)$ model through correspondence scheme using power-la... |
1701.08063 | Carlos A. Batista da S. Filho | Jo\'as Ven\^ancio, Carlos Batista | Integrability of the Dirac Equation on Backgrounds that are the Direct
Product of Bidimensional Spaces | 12 pages | Phys. Rev. D 95, 084022 (2017) | 10.1103/PhysRevD.95.084022 | null | gr-qc hep-th math-ph math.DG math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The field equation for a spin 1/2 massive charged particle propagating in
spacetimes that are the direct product of 2-dimensional spaces is separated.
Moreover, we use this result to attain the separability of the Dirac equation
in some specific static black hole solutions whose horizons have topology
$\mathbb{R}\tim... | [
{
"created": "Fri, 27 Jan 2017 14:31:42 GMT",
"version": "v1"
}
] | 2017-04-19 | [
[
"Venâncio",
"Joás",
""
],
[
"Batista",
"Carlos",
""
]
] | The field equation for a spin 1/2 massive charged particle propagating in spacetimes that are the direct product of 2-dimensional spaces is separated. Moreover, we use this result to attain the separability of the Dirac equation in some specific static black hole solutions whose horizons have topology $\mathbb{R}\times... |
1706.04827 | Gregory Horndeski | Gregory W. Horndeski | Conformally Invariant Scalar-Tensor Field Theories in a Four-Dimensional
Space | 80 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a four-dimensional space, I shall construct all of the conformally
invariant scalar-tensor field theories, which are flat space compatible; i.e.,
well-defined and differentiable when evaluated for a flat metric tensor and
constant scalar field. It will be shown that all such field theories must be at
most of fourt... | [
{
"created": "Wed, 14 Jun 2017 15:24:11 GMT",
"version": "v1"
}
] | 2017-06-16 | [
[
"Horndeski",
"Gregory W.",
""
]
] | In a four-dimensional space, I shall construct all of the conformally invariant scalar-tensor field theories, which are flat space compatible; i.e., well-defined and differentiable when evaluated for a flat metric tensor and constant scalar field. It will be shown that all such field theories must be at most of fourth-... |
gr-qc/0505039 | Anton V. Ryzhov | S. Deser and A.V. Ryzhov | Curvature invariants of static spherically symmetric geometries | 14 pages | Class.Quant.Grav.22:3315-3324,2005 | 10.1088/0264-9381/22/16/012 | BRX TH-563 | gr-qc hep-th | null | We construct all independent local scalar monomials in the Riemann tensor at
arbitrary dimension, for the special regime of static, spherically symmetric
geometries. Compared to general spaces, their number is significantly reduced:
the extreme example is the collapse of all invariants ~ Weyl^k, to a single
term at e... | [
{
"created": "Tue, 10 May 2005 19:51:55 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Deser",
"S.",
""
],
[
"Ryzhov",
"A. V.",
""
]
] | We construct all independent local scalar monomials in the Riemann tensor at arbitrary dimension, for the special regime of static, spherically symmetric geometries. Compared to general spaces, their number is significantly reduced: the extreme example is the collapse of all invariants ~ Weyl^k, to a single term at eac... |
2008.10683 | Juan Carlos Degollado | Juan Carlos Degollado, Marcelo Salgado and Miguel Alcubierre | On the formation of "supermassive" neutron stars and dynamical
transition to spontaneous scalarization | 7 pages, 5 figures. Accepted for publication in Phys.Lett.B | null | 10.1016/j.physletb.2020.135666 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that neutron stars can undergo a phase transition under a
certain class of Scalar Tensor Theories of gravity (STT's) where a new order
parameter, the {\it scalar charge}, appears within the star. This is the well
known phenomenon of spontaneous scalarization (SC) discovered by Damour and
Esposito-Far... | [
{
"created": "Mon, 24 Aug 2020 20:07:41 GMT",
"version": "v1"
}
] | 2020-09-02 | [
[
"Degollado",
"Juan Carlos",
""
],
[
"Salgado",
"Marcelo",
""
],
[
"Alcubierre",
"Miguel",
""
]
] | It is well known that neutron stars can undergo a phase transition under a certain class of Scalar Tensor Theories of gravity (STT's) where a new order parameter, the {\it scalar charge}, appears within the star. This is the well known phenomenon of spontaneous scalarization (SC) discovered by Damour and Esposito-Far\`... |
1205.6049 | Llu\'is Bel | Ll. Bel | Global SSS space-time models: $M_a$ and $Q$ | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To make sense of a global space-time model and to give a meaning to the
coordinates that we use, a choice of a constant curvature space-metric of
reference it is as much necessary as it is a choice of units of mass, length
and time. The choice we make leads to contradict the belief that the exterior
domain of a Stati... | [
{
"created": "Mon, 28 May 2012 08:06:54 GMT",
"version": "v1"
}
] | 2012-05-29 | [
[
"Bel",
"Ll.",
""
]
] | To make sense of a global space-time model and to give a meaning to the coordinates that we use, a choice of a constant curvature space-metric of reference it is as much necessary as it is a choice of units of mass, length and time. The choice we make leads to contradict the belief that the exterior domain of a Static ... |
gr-qc/0012012 | Jonathan Thornburg | Jonathan Thornburg | A Multiple-Grid-Patch Evolution Scheme for 3-D Black Hole Excision | LaTeX, 2 pages including 1 postscript figure; uses World Scientific
style file ws-p9-75x6-50.cls (enclosed); to appear in Proceedings of the 9th
Marcel Grossman Meeting; talk presented 6 July 2000 in MG9 session CM3 -
Black Hole Collisions | null | null | UWThPh-2000-50 | gr-qc | null | When using black hole excision to numerically evolve a fully generic black
hole spacetime, most 3-D 3+1 codes use an $xyz$-topology (spatial) grid. In
such a grid, an $r = \constant$ excision surface must be approximated by an
irregular and non-smooth "staircase-shaped" excision grid boundary, which may
introduce num... | [
{
"created": "Mon, 4 Dec 2000 17:03:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Thornburg",
"Jonathan",
""
]
] | When using black hole excision to numerically evolve a fully generic black hole spacetime, most 3-D 3+1 codes use an $xyz$-topology (spatial) grid. In such a grid, an $r = \constant$ excision surface must be approximated by an irregular and non-smooth "staircase-shaped" excision grid boundary, which may introduce numer... |
2310.10104 | Raziyeh Zaregonbadi | Raziyeh Zaregonbadi, Nasim Saba, Mehrdad Farhoudi | Cosmological Solutions of Chameleon Scalar Field Model | 23 pages, 10 figures | Eur. Phys. J. C (2023) 83:975 | 10.1140/epjc/s10052-023-12138-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate cosmological solutions of the chameleon model with a
non-minimal coupling between the matter and the scalar field through a
conformal factor with gravitational strength. By considering the spatially flat
FLRW metric and the matter density as a non-relativistic perfect fluid, we
focus on the matter-domi... | [
{
"created": "Mon, 16 Oct 2023 06:29:18 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Oct 2023 06:17:15 GMT",
"version": "v2"
}
] | 2023-11-01 | [
[
"Zaregonbadi",
"Raziyeh",
""
],
[
"Saba",
"Nasim",
""
],
[
"Farhoudi",
"Mehrdad",
""
]
] | We investigate cosmological solutions of the chameleon model with a non-minimal coupling between the matter and the scalar field through a conformal factor with gravitational strength. By considering the spatially flat FLRW metric and the matter density as a non-relativistic perfect fluid, we focus on the matter-domina... |
1708.06371 | Laura Sberna | Laura Sberna and Paolo Pani | On Bouncing and Nonsingular Solutions in Einstein-scalar-Gauss-Bonnet
Cosmology | 9 pages, 4 figures; references and discussion added; further minor
revision, accepted to PRD | Phys. Rev. D 96, 124022 (2017) | 10.1103/PhysRevD.96.124022 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is generically believed that higher-order curvature corrections to the
Einstein-Hilbert action might cure the curvature singularities that plague
general relativity. Here we consider Einstein-scalar-Gauss-Bonnet gravity, the
only four-dimensional, ghost-free theory with quadratic curvature terms. For
any choice of... | [
{
"created": "Mon, 21 Aug 2017 18:08:49 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Sep 2017 13:29:24 GMT",
"version": "v2"
},
{
"created": "Tue, 28 Nov 2017 18:38:53 GMT",
"version": "v3"
}
] | 2017-12-27 | [
[
"Sberna",
"Laura",
""
],
[
"Pani",
"Paolo",
""
]
] | It is generically believed that higher-order curvature corrections to the Einstein-Hilbert action might cure the curvature singularities that plague general relativity. Here we consider Einstein-scalar-Gauss-Bonnet gravity, the only four-dimensional, ghost-free theory with quadratic curvature terms. For any choice of t... |
1606.04045 | Babak Vakili | M. A. Gorji, V. Hosseinzadeh, K. Nozari and B. Vakili | Photon gas thermodynamics in dS and AdS momentum spaces | 10 pages, 3 figures, typos corrected, final version | J. Stat. Mech. (JSTAT) (2016) 073107 | 10.1088/1742-5468/2016/07/073107 | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study thermostatistical properties of a photon gas in the
framework of two deformed special relativity models defined by the cosmological
coordinatizations of the de Sitter (dS) and anti-de Sitter (AdS) momentum
spaces. The dS model is a doubly special relativity theory in which an
ultraviolet lengt... | [
{
"created": "Mon, 13 Jun 2016 17:50:29 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2016 07:08:48 GMT",
"version": "v2"
}
] | 2016-07-29 | [
[
"Gorji",
"M. A.",
""
],
[
"Hosseinzadeh",
"V.",
""
],
[
"Nozari",
"K.",
""
],
[
"Vakili",
"B.",
""
]
] | In this paper, we study thermostatistical properties of a photon gas in the framework of two deformed special relativity models defined by the cosmological coordinatizations of the de Sitter (dS) and anti-de Sitter (AdS) momentum spaces. The dS model is a doubly special relativity theory in which an ultraviolet length ... |
gr-qc/0203042 | James Isenberg | James Isenberg and Vince Moncrief | Asymptotic Behavior of Polarized and Half-Polarized U(1) symmetric
Vacuum Spacetimes | 42 pges | Class.Quant.Grav. 19 (2002) 5361-5386 | 10.1088/0264-9381/19/21/305 | null | gr-qc | null | We use the Fuchsian algorithm to study the behavior near the singularity of
certain families of U(1) Symmetric solutions of the vacuum Einstein equations
(with the U(1) isometry group acting spatially). We consider an analytic family
of polarized solutions with the maximum number of arbitrary functions
consistent wit... | [
{
"created": "Tue, 12 Mar 2002 20:11:33 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Isenberg",
"James",
""
],
[
"Moncrief",
"Vince",
""
]
] | We use the Fuchsian algorithm to study the behavior near the singularity of certain families of U(1) Symmetric solutions of the vacuum Einstein equations (with the U(1) isometry group acting spatially). We consider an analytic family of polarized solutions with the maximum number of arbitrary functions consistent with ... |
gr-qc/0410113 | Matt Visser | Stefano Liberati (SISSA, Trieste, Italy), Sebastiano Sonego (Udine,
Italy), and Matt Visser (Victoria, New Zealand) | Interpreting doubly special relativity as a modified theory of
measurement | 18 pages, plain LaTeX2E | Phys.Rev. D71 (2005) 045001 | 10.1103/PhysRevD.71.045001 | null | gr-qc | null | In this article we develop a physical interpretation for the deformed
(doubly) special relativity theories (DSRs), based on a modification of the
theory of measurement in special relativity. We suggest that it is useful to
regard the DSRs as reflecting the manner in which quantum gravity effects
induce Planck-suppres... | [
{
"created": "Thu, 21 Oct 2004 22:58:55 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Liberati",
"Stefano",
"",
"SISSA, Trieste, Italy"
],
[
"Sonego",
"Sebastiano",
"",
"Udine,\n Italy"
],
[
"Visser",
"Matt",
"",
"Victoria, New Zealand"
]
] | In this article we develop a physical interpretation for the deformed (doubly) special relativity theories (DSRs), based on a modification of the theory of measurement in special relativity. We suggest that it is useful to regard the DSRs as reflecting the manner in which quantum gravity effects induce Planck-suppresse... |
2010.03793 | Cosimo Bambi | Cosimo Bambi | Testing General Relativity with Black Hole X-ray Data | 10 pages, 1 figure. Talk given at the "4th Zeldovich Virtual Meeting"
(Minsk, Belarus, 7-11 September 2020) | Astron. Rep. 65, 902-905 (2021) | 10.1134/S1063772921100024 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein's theory of General Relativity was proposed over 100 years ago and
has successfully passed a large number of observational tests in weak
gravitational fields. On the contrary, the strong field regime is still largely
unexplored. Astrophysical black holes are ideal laboratories for testing
gravity in the stro... | [
{
"created": "Thu, 8 Oct 2020 06:44:23 GMT",
"version": "v1"
}
] | 2021-10-29 | [
[
"Bambi",
"Cosimo",
""
]
] | Einstein's theory of General Relativity was proposed over 100 years ago and has successfully passed a large number of observational tests in weak gravitational fields. On the contrary, the strong field regime is still largely unexplored. Astrophysical black holes are ideal laboratories for testing gravity in the strong... |
2008.07314 | Ram Gopal Vishwakarma | Ram Gopal Vishwakarma | Relativistic potential of Weyl: a gateway to quantum physics in the
presence of gravitation? | Published in CQG | Class. Quant. Grav. 37 (2020) 6, 065020 | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The well-noted correspondence between gravitation and electrodynamics
emphasizes the importance of the Lanczos tensor -- the potential of the Weyl
tensor -- which is an inherent structural element of any metric theory of
gravity formulated in a 4-dimensional pseudo Riemannian spacetime. However,
this ingenious discov... | [
{
"created": "Wed, 12 Aug 2020 21:59:53 GMT",
"version": "v1"
}
] | 2020-08-20 | [
[
"Vishwakarma",
"Ram Gopal",
""
]
] | The well-noted correspondence between gravitation and electrodynamics emphasizes the importance of the Lanczos tensor -- the potential of the Weyl tensor -- which is an inherent structural element of any metric theory of gravity formulated in a 4-dimensional pseudo Riemannian spacetime. However, this ingenious discover... |
gr-qc/0005050 | Clarissa Claudel | Clarissa-Marie Claudel, K.S. Virbhadra and G.F.R. Ellis | The geometry of photon surfaces | 24 pages, 5 figures. Uses the following packages: amsmath, amsthm,
amssymb, amsfonts, mathrsfs, enumerate, graphicx | J.Math.Phys.42:818-838,2001 | 10.1063/1.1308507 | null | gr-qc | null | The photon sphere concept in Schwarzschild space-time is generalized to a
definition of a photon surface in an arbitrary space-time. A photon sphere is
then defined as an SO(3)xR-invariant photon surface in a static spherically
symmetric space-time. It is proved, subject to an energy condition, that a
black hole in a... | [
{
"created": "Mon, 15 May 2000 22:45:13 GMT",
"version": "v1"
},
{
"created": "Fri, 7 Jul 2000 09:19:58 GMT",
"version": "v2"
}
] | 2010-02-22 | [
[
"Claudel",
"Clarissa-Marie",
""
],
[
"Virbhadra",
"K. S.",
""
],
[
"Ellis",
"G. F. R.",
""
]
] | The photon sphere concept in Schwarzschild space-time is generalized to a definition of a photon surface in an arbitrary space-time. A photon sphere is then defined as an SO(3)xR-invariant photon surface in a static spherically symmetric space-time. It is proved, subject to an energy condition, that a black hole in any... |
gr-qc/0303080 | Tekin Dereli | M. Adak, T. Dereli, L. H. Ryder | Possible effects of spacetime non-metricity on neutrino oscillations | null | Phys.Rev. D69 (2004) 123002 | 10.1103/PhysRevD.69.123002 | null | gr-qc | null | The contribution of gravitational neutrino oscillations to the solar neutrino
problem is studied by constructing the Dirac Hamiltonian and calculating the
corresponding dynamical phase in the vicinity of the Sun in a non-Riemann
background Kerr space-time with torsion and non-metricity. We show that certain
component... | [
{
"created": "Thu, 20 Mar 2003 14:06:19 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Sep 2004 14:24:08 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Adak",
"M.",
""
],
[
"Dereli",
"T.",
""
],
[
"Ryder",
"L. H.",
""
]
] | The contribution of gravitational neutrino oscillations to the solar neutrino problem is studied by constructing the Dirac Hamiltonian and calculating the corresponding dynamical phase in the vicinity of the Sun in a non-Riemann background Kerr space-time with torsion and non-metricity. We show that certain components ... |
1609.00407 | Ichiro Oda | Ichiro Oda | Cosmology in Weyl Transverse Gravity | 14 pages | null | 10.1142/S0217732316502187 | DPUR/TH/52 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmology in the
Weyl-transverse (WTDiff) gravity in a general space-time dimension. The WTDiff
gravity is invariant under both the local Weyl (conformal) transformation and
the volume preserving diffeormorphisms (transverse diffeomorphisms) and is
believed to b... | [
{
"created": "Thu, 1 Sep 2016 21:36:08 GMT",
"version": "v1"
}
] | 2016-12-14 | [
[
"Oda",
"Ichiro",
""
]
] | We study the Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmology in the Weyl-transverse (WTDiff) gravity in a general space-time dimension. The WTDiff gravity is invariant under both the local Weyl (conformal) transformation and the volume preserving diffeormorphisms (transverse diffeomorphisms) and is believed to be ... |
gr-qc/9712070 | John F. Donoghue | John F. Donoghue (Univ. of Massachusetts) | Perturbative dynamics of quantum general relativity | Invited plenary talk at the 8th Marcel Grossmann Conference on
General Relativity | null | null | null | gr-qc | null | The quantum theory of General Relativity at low energy exists and is of the
form called "effective field theory". In this talk I describe the ideas of
effective field theory and its application to General Relativity.
| [
{
"created": "Tue, 16 Dec 1997 20:38:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Donoghue",
"John F.",
"",
"Univ. of Massachusetts"
]
] | The quantum theory of General Relativity at low energy exists and is of the form called "effective field theory". In this talk I describe the ideas of effective field theory and its application to General Relativity. |
gr-qc/9509002 | Jorge Pullin | Jorge Pullin | MATTERS OF GRAVITY, The newsletter of the APS Topical Group on
Gravitation | 31 pages, plain TeX, one figure included with epsf (minor correction
in date and volume number) | null | null | MOG-6 | gr-qc | null | Contents:
-Report from the APS Topical Group in Gravitation, Beverly Berger
-Some remarks on the passing of S. Chandrasekhar, Robert Wald
-LIGO Project Status, Syd Meshkov and Stan Whitcomb
-New Hyperbolic forms of the Einstein Equations, Andrew Abrahams
-Massless Black Holes, Gary Horowitz
-A plea for th... | [
{
"created": "Fri, 1 Sep 1995 23:02:31 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Sep 1995 14:32:38 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Pullin",
"Jorge",
""
]
] | Contents: -Report from the APS Topical Group in Gravitation, Beverly Berger -Some remarks on the passing of S. Chandrasekhar, Robert Wald -LIGO Project Status, Syd Meshkov and Stan Whitcomb -New Hyperbolic forms of the Einstein Equations, Andrew Abrahams -Massless Black Holes, Gary Horowitz -A plea for theoretical help... |
1712.10272 | Alexander Vikman | David A. Dobre, Andrei V. Frolov, Jos\'e T. G\'alvez Ghersi, Sabir
Ramazanov, Alexander Vikman | Unbraiding the Bounce: Superluminality around the Corner | published version. 16 pages + references, 4 figures, new section on
Conformal Transformations, Gauges and Acoustic Geometry, new figure.
Corrected typos, added references | JCAP 1803 (2018) 020 | 10.1088/1475-7516/2018/03/020 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a particular realization of the cosmological bounce scenario
proposed recently by Ijjas and Steinhardt. First, we find that their bouncing
solution starts from a divergent sound speed and ends with its vanishing. Thus,
the solution connects two strongly coupled configurations. These pathologies
are separated... | [
{
"created": "Fri, 29 Dec 2017 16:34:48 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2018 18:58:59 GMT",
"version": "v2"
},
{
"created": "Tue, 13 Mar 2018 14:15:14 GMT",
"version": "v3"
}
] | 2018-03-14 | [
[
"Dobre",
"David A.",
""
],
[
"Frolov",
"Andrei V.",
""
],
[
"Ghersi",
"José T. Gálvez",
""
],
[
"Ramazanov",
"Sabir",
""
],
[
"Vikman",
"Alexander",
""
]
] | We study a particular realization of the cosmological bounce scenario proposed recently by Ijjas and Steinhardt. First, we find that their bouncing solution starts from a divergent sound speed and ends with its vanishing. Thus, the solution connects two strongly coupled configurations. These pathologies are separated f... |
1404.7823 | Ivan Booth | David Wenjie Tian and Ivan Booth | Lessons from $f(R,R_c^2,R_m^2, L_m)$ gravity: Smooth Gauss-Bonnet limit,
energy-momentum conservation and nonminimal coupling | Final version: 29 pages, 1 table, modified RevTex format in one
column. To appear in Physical Review D | Physical Review D 90, 024059 (2014) | 10.1103/PhysRevD.90.024059 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper studies a generic fourth-order theory of gravity with Lagrangian
density $f(R,R_c^2,R_m^2, \mathscr{L}_m)$. By considering explicit $R^2$
dependence and imposing the "coherence condition" $f_{R^2}\!=\!f_{R_m^2}\!=\!
-f_{R_c^2}/4$, the field equations of $f(R,R^2,R_c^2,R_m^2, \mathscr{L}_m)$
gravity can be ... | [
{
"created": "Wed, 30 Apr 2014 18:25:01 GMT",
"version": "v1"
},
{
"created": "Thu, 15 May 2014 19:01:02 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Jul 2014 13:23:26 GMT",
"version": "v3"
}
] | 2015-07-14 | [
[
"Tian",
"David Wenjie",
""
],
[
"Booth",
"Ivan",
""
]
] | This paper studies a generic fourth-order theory of gravity with Lagrangian density $f(R,R_c^2,R_m^2, \mathscr{L}_m)$. By considering explicit $R^2$ dependence and imposing the "coherence condition" $f_{R^2}\!=\!f_{R_m^2}\!=\! -f_{R_c^2}/4$, the field equations of $f(R,R^2,R_c^2,R_m^2, \mathscr{L}_m)$ gravity can be sm... |
1907.07126 | Kazumasa Okabayashi | Kazumasa Okabayashi, Kei-ichi Maeda | Maximal Efficiency of Collisional Penrose Process with Spinning Particle
II | 18 pages, 1 table, 7 figures; minor improvements, published version | Progress of Theoretical and Experimental Physics, Volume 2020,
Issue 1, January 2020, 013E01 | 10.1093/ptep/ptz143 | OCU-PHYS-505, AP-GR-155, WU-AP/1905/19 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the collisional Penrose process between a particle on the ISCO
orbit around an extreme Kerr black hole and a particle impinging from infinity.
We consider both cases with non-spinning and spinning particles. We evaluate
the maximal efficiency, $\eta_{\text{max}}=(\text{extracted
energy})/(\text{input energ... | [
{
"created": "Mon, 15 Jul 2019 15:49:29 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Sep 2019 09:13:44 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Nov 2019 04:40:59 GMT",
"version": "v3"
},
{
"created": "Mon, 4 Nov 2019 15:15:50 GMT",
"version": "v4"
},
{
"cre... | 2020-01-22 | [
[
"Okabayashi",
"Kazumasa",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We analyze the collisional Penrose process between a particle on the ISCO orbit around an extreme Kerr black hole and a particle impinging from infinity. We consider both cases with non-spinning and spinning particles. We evaluate the maximal efficiency, $\eta_{\text{max}}=(\text{extracted energy})/(\text{input energy}... |
gr-qc/9608035 | Marc Israelit | Mark Israelit (Univ. Konstanz, on leave from Univ. Haifa) | Conformally coupled dark matter | LaTEX File 10 pages, no figures | null | 10.1007/BF00639596 | null | gr-qc | null | Dark matter is obtained from a scalar field coupled conformally to
gravitation; the scalar being a relict of Dirac's gauge function. This
conformally coupled dark matter includes a gas of very light ($m\approx
2.25\times 10^{-34} eV$) neutral bosons having spin 0, as well as a
time-dependent global scalar field, both... | [
{
"created": "Thu, 15 Aug 1996 08:34:32 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Israelit",
"Mark",
"",
"Univ. Konstanz, on leave from Univ. Haifa"
]
] | Dark matter is obtained from a scalar field coupled conformally to gravitation; the scalar being a relict of Dirac's gauge function. This conformally coupled dark matter includes a gas of very light ($m\approx 2.25\times 10^{-34} eV$) neutral bosons having spin 0, as well as a time-dependent global scalar field, both p... |
2401.07406 | Nikolaos Stergioulas | Nikolaos Stergioulas | Machine Learning Applications in Gravitational Wave Astronomy | 29 pages, 15 figure, to appear in the proceedings of the 11th Aegean
Summer School Recent Developments in Theory and Observations in Gravity and
Cosmology | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave astronomy has emerged as a new branch of observational
astronomy, since the first detection of gravitational waves in 2015. The
current number of $O(100)$ detections is expected to grow by several orders of
magnitude over the next two decades. As a result, current computationally
expensive detectio... | [
{
"created": "Mon, 15 Jan 2024 00:51:43 GMT",
"version": "v1"
}
] | 2024-01-17 | [
[
"Stergioulas",
"Nikolaos",
""
]
] | Gravitational wave astronomy has emerged as a new branch of observational astronomy, since the first detection of gravitational waves in 2015. The current number of $O(100)$ detections is expected to grow by several orders of magnitude over the next two decades. As a result, current computationally expensive detection ... |
2405.15467 | Orhan Donmez | Orhan Donmez | The comparison of alternative spacetimes using the spherical accretion
around the black hole | 22 pages and 8 figures. Accepted for publication in MPLA | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the region where the gravitational field is strong, we have examined the
influence of different gravities on the accretion disk formed due to spherical
accretion. To achieve this, we obtain numerical solutions of the GRH equations,
utilizing Schwarzschild, Kerr, Einstein-Gauss-Bonnet, and Hartle-Thorne
spacetime m... | [
{
"created": "Fri, 24 May 2024 11:43:20 GMT",
"version": "v1"
}
] | 2024-05-27 | [
[
"Donmez",
"Orhan",
""
]
] | In the region where the gravitational field is strong, we have examined the influence of different gravities on the accretion disk formed due to spherical accretion. To achieve this, we obtain numerical solutions of the GRH equations, utilizing Schwarzschild, Kerr, Einstein-Gauss-Bonnet, and Hartle-Thorne spacetime met... |
1603.03692 | Julio Cesar Fabris | Kirill A. Bronnikov, J\'ulio C. Fabris, Denis C. Rodrigues | On Black Hole Structures in Scalar-Tensor Theories of Gravity | Latex file, 13 pages. To appear in the IJMPD in the special issue
dedicated to the "III Amazonian Symposium on Physics", occurred from 28th
september to 2nd october 2015, Bel\'em, Par\'a, Brazil | null | 10.1142/S0218271816410054 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review some properties of black hole structures appearing in gravity with
a massless scalar field, with both minimal and nonminimal coupling. The main
properties of the resulting cold black holes are described. The study of black
holes in scalar-gravity systems is extended to $k$-essence theories, and some
example... | [
{
"created": "Fri, 11 Mar 2016 16:56:17 GMT",
"version": "v1"
}
] | 2016-08-17 | [
[
"Bronnikov",
"Kirill A.",
""
],
[
"Fabris",
"Júlio C.",
""
],
[
"Rodrigues",
"Denis C.",
""
]
] | We review some properties of black hole structures appearing in gravity with a massless scalar field, with both minimal and nonminimal coupling. The main properties of the resulting cold black holes are described. The study of black holes in scalar-gravity systems is extended to $k$-essence theories, and some examples ... |
2407.06781 | Li Tang | Li Tang, Xi-Long Fan | Inferring the spin distribution of binary black holes using deep
learning | 10 pages, 8 figures, 1 table | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spin characteristics of black holes offer valuable insights into the
evolutionary pathways of their progenitor stars, crucial for understanding the
broader population properties of black holes. Traditional Hierarchical Bayesian
inference techniques employed to discern these properties often entail
substantial tim... | [
{
"created": "Tue, 9 Jul 2024 11:52:46 GMT",
"version": "v1"
}
] | 2024-07-10 | [
[
"Tang",
"Li",
""
],
[
"Fan",
"Xi-Long",
""
]
] | The spin characteristics of black holes offer valuable insights into the evolutionary pathways of their progenitor stars, crucial for understanding the broader population properties of black holes. Traditional Hierarchical Bayesian inference techniques employed to discern these properties often entail substantial time ... |
2110.07688 | Jacek Tafel | Jacek Tafel | The Einstein metrics with smooth scri | 10 pages | null | 10.1007/s10714-022-02986-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider solutions of the Einstein equations with cosmological constant
$\Lambda\neq 0$ admitting conformal compactification with smooth scri
$\mathscr{I^+}$. Metrics are written in the Bondi-Sachs coordinates and
expanded into inverse powers of the affine distance $r$. Unlike in the case
$\Lambda=0$ all free data... | [
{
"created": "Thu, 14 Oct 2021 19:54:48 GMT",
"version": "v1"
}
] | 2022-09-28 | [
[
"Tafel",
"Jacek",
""
]
] | We consider solutions of the Einstein equations with cosmological constant $\Lambda\neq 0$ admitting conformal compactification with smooth scri $\mathscr{I^+}$. Metrics are written in the Bondi-Sachs coordinates and expanded into inverse powers of the affine distance $r$. Unlike in the case $\Lambda=0$ all free data a... |
2201.01966 | Tianzhi Wang | Tian-Zhi Wang and Wen-Biao Liu | Spatial and Temporal Chaos of a Bardeen-AdS Black Hole and Effects of
Quintessence Dark Energy | 17 pages, 16 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermal chaos under spatially/temporally periodic perturbations in the
extended phase space of Bardeen-AdS black holes surrounded by quintessence dark
energy is investigated. The occurring condition of chaos is obtained with the
Melnikov integral. It is shown that spatial chaos is always supposed to occur
even for a ... | [
{
"created": "Thu, 6 Jan 2022 08:25:27 GMT",
"version": "v1"
}
] | 2022-01-07 | [
[
"Wang",
"Tian-Zhi",
""
],
[
"Liu",
"Wen-Biao",
""
]
] | Thermal chaos under spatially/temporally periodic perturbations in the extended phase space of Bardeen-AdS black holes surrounded by quintessence dark energy is investigated. The occurring condition of chaos is obtained with the Melnikov integral. It is shown that spatial chaos is always supposed to occur even for a ti... |
gr-qc/9805064 | Hiroshi Umetsu | Hisao Suzuki, Eiichi Takasugi and Hiroshi Umetsu | Perturbations of Kerr-de Sitter Black Hole and Heun's Equations | 17 pages, LaTeX | Prog.Theor.Phys. 100 (1998) 491-505 | 10.1143/PTP.100.491 | EPHOU 98-005, OU-HET-296 | gr-qc | null | It is well known that the perturbation equations of massless fields for the
Kerr-de Sitter geometry can be written in the form of separable equations. The
equations have five definite singularities so that the analysis has been
expected to be difficult. We show that these equations can be transformed to
Heun's equati... | [
{
"created": "Mon, 18 May 1998 08:45:42 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Suzuki",
"Hisao",
""
],
[
"Takasugi",
"Eiichi",
""
],
[
"Umetsu",
"Hiroshi",
""
]
] | It is well known that the perturbation equations of massless fields for the Kerr-de Sitter geometry can be written in the form of separable equations. The equations have five definite singularities so that the analysis has been expected to be difficult. We show that these equations can be transformed to Heun's equation... |
1803.09767 | Swagat Saurav Mishra | Swagat S. Mishra and Varun Sahni | Unifying Dark Matter and Dark Energy with non-Canonical Scalars | 19 pages, 9 figures. Comprehensively revised and expanded. New
section on Cascading dark energy | null | null | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-canonical scalar fields with the Lagrangian ${\cal L} = X^\alpha -
V(\phi)$, possess the attractive property that the speed of sound, $c_s^{2} =
(2\,\alpha - 1)^{-1}$, can be exceedingly small for large values of $\alpha$.
This allows a non-canonical field to cluster and behave like warm/cold dark
matter on small... | [
{
"created": "Mon, 26 Mar 2018 18:00:43 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Apr 2018 15:24:40 GMT",
"version": "v2"
}
] | 2018-04-17 | [
[
"Mishra",
"Swagat S.",
""
],
[
"Sahni",
"Varun",
""
]
] | Non-canonical scalar fields with the Lagrangian ${\cal L} = X^\alpha - V(\phi)$, possess the attractive property that the speed of sound, $c_s^{2} = (2\,\alpha - 1)^{-1}$, can be exceedingly small for large values of $\alpha$. This allows a non-canonical field to cluster and behave like warm/cold dark matter on small s... |
1707.00065 | Suddhasattwa Brahma | Jakub Bilski and Antonino Marciano | Quantum Reduced Loop Gravity with matter: eigenvectors of the
Hamiltonian operator in isotropic cosmology | 14 pages. arXiv admin note: text overlap with arXiv:1905.00001 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Introducing a new method, we demonstrate how the action of reduced operators
can be derived without resorting to a recoupling theory and how they exactly
reproduce the results obtained in the standard approach of Quantum Reduced Loop
Gravity (QRLG). This is particularly relevant while dealing with volume
operator whe... | [
{
"created": "Fri, 30 Jun 2017 23:19:42 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Jul 2020 01:15:06 GMT",
"version": "v2"
}
] | 2020-07-07 | [
[
"Bilski",
"Jakub",
""
],
[
"Marciano",
"Antonino",
""
]
] | Introducing a new method, we demonstrate how the action of reduced operators can be derived without resorting to a recoupling theory and how they exactly reproduce the results obtained in the standard approach of Quantum Reduced Loop Gravity (QRLG). This is particularly relevant while dealing with volume operator when ... |
2312.14257 | Miguel Cruz | Miguel Cruz, Samuel Lepe and Joel Saavedra | A new approach to $P-V$ phase transitions: Einstein gravity and
holographic type dark energy | 20 pages, 4 figures. Accepted for publication in Physics of the Dark
Universe | Phys. Dark Univ. 46, 101580 (2024) | 10.1016/j.dark.2024.101580 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of Einstein's gravity, we study the thermodynamic equation
state, $P=P(V,T)$, associated with a flat Friedmann-Lemaitre-Robertson-Walker
(FLRW) universe. In this scenario, we consider the components of the dark
sector as non-interacting fluids that dominate the universe's energy content at
late times... | [
{
"created": "Thu, 21 Dec 2023 19:19:23 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Jul 2024 15:46:23 GMT",
"version": "v2"
}
] | 2024-07-25 | [
[
"Cruz",
"Miguel",
""
],
[
"Lepe",
"Samuel",
""
],
[
"Saavedra",
"Joel",
""
]
] | In the framework of Einstein's gravity, we study the thermodynamic equation state, $P=P(V,T)$, associated with a flat Friedmann-Lemaitre-Robertson-Walker (FLRW) universe. In this scenario, we consider the components of the dark sector as non-interacting fluids that dominate the universe's energy content at late times. ... |
gr-qc/9712040 | Iosif B. Khriplovich | I.B. Khriplovich and A.A. Pomeransky | Tail of Gravitational Radiation and Coulomb Final-State Interaction | 4 pages, latex | Phys.Lett. A252 (1999) 17-19 | 10.1016/S0375-9601(98)00922-0 | BINP 97-97 | gr-qc | null | We present a simple intuitive derivation of the corrections to the intensity
of gravitational radiation due to the so-called tail effect.
| [
{
"created": "Tue, 9 Dec 1997 04:48:11 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Khriplovich",
"I. B.",
""
],
[
"Pomeransky",
"A. A.",
""
]
] | We present a simple intuitive derivation of the corrections to the intensity of gravitational radiation due to the so-called tail effect. |
1209.1981 | Pau Figueras | Pau Figueras, Keiju Murata and Harvey S. Reall | Stable non-uniform black strings below the critical dimension | 26 pages, 11 figures. V2: reference added, matches published version | null | 10.1007/JHEP11(2012)071 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The higher-dimensional vacuum Einstein equation admits translationally
non-uniform black string solutions. It has been argued that infinitesimally
non-uniform black strings should be unstable in 13 or fewer dimensions and
otherwise stable. We construct numerically non-uniform black string solutions
in 11, 12, 13, 14 ... | [
{
"created": "Mon, 10 Sep 2012 13:25:57 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Nov 2012 17:06:24 GMT",
"version": "v2"
}
] | 2012-11-30 | [
[
"Figueras",
"Pau",
""
],
[
"Murata",
"Keiju",
""
],
[
"Reall",
"Harvey S.",
""
]
] | The higher-dimensional vacuum Einstein equation admits translationally non-uniform black string solutions. It has been argued that infinitesimally non-uniform black strings should be unstable in 13 or fewer dimensions and otherwise stable. We construct numerically non-uniform black string solutions in 11, 12, 13, 14 an... |
1507.02152 | Alexander Dolgov | E.V. Arbuzova, A.D. Dolgov, L. Reverberi | Gravitational instability in oscillating background | 21 pages, 14 figures | Phys. Rev. D 92, 064041 (2015) | 10.1103/PhysRevD.92.064041 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Evolution of density and metric perturbations in the background of high
frequency oscillations of curvature in F(R) gravity is considered. In addition
to the usual Jeans-like instability new effects of amplification of
perturbations, associated with parametric resonance and antifriction phenomena,
are found.
| [
{
"created": "Wed, 8 Jul 2015 13:38:48 GMT",
"version": "v1"
}
] | 2015-09-30 | [
[
"Arbuzova",
"E. V.",
""
],
[
"Dolgov",
"A. D.",
""
],
[
"Reverberi",
"L.",
""
]
] | Evolution of density and metric perturbations in the background of high frequency oscillations of curvature in F(R) gravity is considered. In addition to the usual Jeans-like instability new effects of amplification of perturbations, associated with parametric resonance and antifriction phenomena, are found. |
1505.07337 | Muhammad Zubair | M. Zubair | Generalized Second Law of Thermodynamics in $f(T,T_{G})$ gravity | 19 pages, 5 figures | null | 10.1007/s10509-015-2527-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An equilibrium picture of thermodynamics is discussed at the apparent horizon
of FRW universe in $f(T,T_G)$ gravity, where $T$ represents the torsion
invariant and $T_G$ is the teleparallel equivalent of the Gauss-Bonnet term. It
is found that one can translate the Friedmann equations to the standard form of
first la... | [
{
"created": "Tue, 26 May 2015 06:25:16 GMT",
"version": "v1"
}
] | 2015-11-04 | [
[
"Zubair",
"M.",
""
]
] | An equilibrium picture of thermodynamics is discussed at the apparent horizon of FRW universe in $f(T,T_G)$ gravity, where $T$ represents the torsion invariant and $T_G$ is the teleparallel equivalent of the Gauss-Bonnet term. It is found that one can translate the Friedmann equations to the standard form of first law ... |
gr-qc/0201012 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | Quantum Space-Time: Deformed Symmetries Versus Broken Symmetries | LaTex, 7 pages, talk given at the 2nd Meeting on CPT and Lorentz
Symmetry (CPT 01), Bloomington, Indiana, 15-18 Aug 2001 | null | 10.1142/9789812778123_0028 | null | gr-qc | null | Several recent studies have concerned the faith of classical symmetries in
quantum space-time. In particular, it appears likely that quantum (discretized,
noncommutative,...) versions of Minkowski space-time would not enjoy the
classical Lorentz symmetries. I compare two interesting cases: the case in
which the class... | [
{
"created": "Fri, 4 Jan 2002 10:53:55 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | Several recent studies have concerned the faith of classical symmetries in quantum space-time. In particular, it appears likely that quantum (discretized, noncommutative,...) versions of Minkowski space-time would not enjoy the classical Lorentz symmetries. I compare two interesting cases: the case in which the classic... |
1405.3774 | Xiangdong Zhang | Helei Liu, Xiangdong Zhang and Dehua Wen | One possible solution of peculiar type Ia supernovae explosions caused
by a charged white dwarf | 13 pages, 8 figures, accepted by PRD | Phys. Rev. D 89, 104043 (2014) | 10.1103/PhysRevD.89.104043 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent astrophysics observation reveals the existence of some super luminous
type Ia supernovae. One natural explanation of such a peculiar phenomenon is to
require the progenitor of such a supernova to be a highly super-Chandrasekhar
mass white dwarf. Along this line, in this paper, we propose a possible
mechanism t... | [
{
"created": "Thu, 15 May 2014 09:13:57 GMT",
"version": "v1"
},
{
"created": "Tue, 20 May 2014 12:52:54 GMT",
"version": "v2"
}
] | 2014-05-26 | [
[
"Liu",
"Helei",
""
],
[
"Zhang",
"Xiangdong",
""
],
[
"Wen",
"Dehua",
""
]
] | Recent astrophysics observation reveals the existence of some super luminous type Ia supernovae. One natural explanation of such a peculiar phenomenon is to require the progenitor of such a supernova to be a highly super-Chandrasekhar mass white dwarf. Along this line, in this paper, we propose a possible mechanism to ... |
2305.04707 | Venkatesha Venkatesha | V. Venkatesha, N. S. Kavya, P.K. Sahoo | Geometric structures of Morris-Thorne wormhole metric in $f(R,L_m)$
gravity and energy conditions | Physica Scripta accepted version | Physica Scripta 98(6) (2023) 065020 | 10.1088/1402-4896/acd483 | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | The aim of this manuscript is to study the traversable wormhole (WH)
geometries in the curvature matter coupling gravity. We investigate static
spherically symmetric Morris-Thorne WHs within the context of $f(R,L_m)$
gravity. To accomplish this, we examine the WH model in four different cases
(i) linear $f(R,L_m)$ mo... | [
{
"created": "Mon, 8 May 2023 13:44:19 GMT",
"version": "v1"
}
] | 2023-05-26 | [
[
"Venkatesha",
"V.",
""
],
[
"Kavya",
"N. S.",
""
],
[
"Sahoo",
"P. K.",
""
]
] | The aim of this manuscript is to study the traversable wormhole (WH) geometries in the curvature matter coupling gravity. We investigate static spherically symmetric Morris-Thorne WHs within the context of $f(R,L_m)$ gravity. To accomplish this, we examine the WH model in four different cases (i) linear $f(R,L_m)$ mode... |
1103.6272 | Sumati Surya | Sumati Surya | Directions in Causal Set Quantum Gravity | 31 pages, 7 figures, To appear in Recent Research in Quantum Gravity,
edited by A. Dasgupta (Nova Science Publishers NY) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the causal set approach to quantum gravity the spacetime continuum arises
as an approximation to a fundamentally discrete substructure, the causal set,
which is a locally finite partially ordered set. The causal set paradigm was
elucidated in a classic paper by Bombelli, Lee, Meyer and Sorkin in 1987. While
early ... | [
{
"created": "Thu, 31 Mar 2011 19:03:23 GMT",
"version": "v1"
}
] | 2011-04-01 | [
[
"Surya",
"Sumati",
""
]
] | In the causal set approach to quantum gravity the spacetime continuum arises as an approximation to a fundamentally discrete substructure, the causal set, which is a locally finite partially ordered set. The causal set paradigm was elucidated in a classic paper by Bombelli, Lee, Meyer and Sorkin in 1987. While early ki... |
gr-qc/0511028 | Muraari Vasudevan | Muraari Vasudevan | A Note on Particles and Scalar Fields in Higher Dimensional Nutty
Spacetimes | Accepted for Publication in Phys. Lett. B., 11 Pages | Phys.Lett. B632 (2006) 532-536 | 10.1016/j.physletb.2005.10.076 | Alberta-Thy 13-05 | gr-qc hep-th math-ph math.MP | null | In this note, we study the integrability of geodesic flow in the background
of a very general class of spacetimes with NUT-charge(s) in higher dimensions.
This broad set encompasses multiply NUT-charged solutions, electrically and
magnetically charged solutions, solutions with a cosmological constant, and
time depend... | [
{
"created": "Sun, 6 Nov 2005 05:51:15 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Vasudevan",
"Muraari",
""
]
] | In this note, we study the integrability of geodesic flow in the background of a very general class of spacetimes with NUT-charge(s) in higher dimensions. This broad set encompasses multiply NUT-charged solutions, electrically and magnetically charged solutions, solutions with a cosmological constant, and time dependan... |
2405.12249 | Jaroslaw Jaracz | Jaroslaw S. Jaracz | Conformal deformations of initial data sets to the strict dominant
energy condition using a spacetime Poisson equation | null | null | null | null | gr-qc math-ph math.AP math.MP | http://creativecommons.org/licenses/by/4.0/ | We give an alternate proof of one of the results given in [16] showing that
initial data sets with boundary for the Einstein equations $(M, g, k)$
satisfying the dominant energy condition can be conformally deformed to the
strict dominant energy condition, while preserving the character of the
boundary (minimal, futu... | [
{
"created": "Sun, 19 May 2024 20:09:12 GMT",
"version": "v1"
}
] | 2024-05-22 | [
[
"Jaracz",
"Jaroslaw S.",
""
]
] | We give an alternate proof of one of the results given in [16] showing that initial data sets with boundary for the Einstein equations $(M, g, k)$ satisfying the dominant energy condition can be conformally deformed to the strict dominant energy condition, while preserving the character of the boundary (minimal, future... |
1708.02373 | Hyeong-Chan Kim | Hyeong-Chan Kim | Black hole in closed spacetime with an anisotropic fluid | 15 pages, 7 figures | Phys. Rev. D 96, 064053 (2017) | 10.1103/PhysRevD.96.064053 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study spherically symmetric geometries made of anisotropic perfect fluid
based on general relativity. The purpose of the work is to find and classify
black hole solutions in closed spacetime. In a general setting, we find that a
static and closed space exists only when the radial pressure is negative but
its size ... | [
{
"created": "Tue, 8 Aug 2017 05:09:23 GMT",
"version": "v1"
}
] | 2017-10-04 | [
[
"Kim",
"Hyeong-Chan",
""
]
] | We study spherically symmetric geometries made of anisotropic perfect fluid based on general relativity. The purpose of the work is to find and classify black hole solutions in closed spacetime. In a general setting, we find that a static and closed space exists only when the radial pressure is negative but its size is... |
2207.02610 | Jibitesh Dutta | Wompherdeiki Khyllep, Jibitesh Dutta, Emmanuel N. Saridakis and
Kuralay Yesmakhanova | Cosmology in $f(Q)$ gravity: A unified dynamical system analysis at
background and perturbation levels | 10 pages and 8 figs. We welcome comments | null | 10.1103/PhysRevD.107.044022 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the fact that cosmological models based on $f(Q)$ gravity are
very efficient in fitting observational datasets at both background and
perturbation levels, we perform a combined dynamical system analysis of both
background and perturbation equations in order to examine the validity of this
result through ... | [
{
"created": "Wed, 6 Jul 2022 12:02:57 GMT",
"version": "v1"
}
] | 2023-02-22 | [
[
"Khyllep",
"Wompherdeiki",
""
],
[
"Dutta",
"Jibitesh",
""
],
[
"Saridakis",
"Emmanuel N.",
""
],
[
"Yesmakhanova",
"Kuralay",
""
]
] | Motivated by the fact that cosmological models based on $f(Q)$ gravity are very efficient in fitting observational datasets at both background and perturbation levels, we perform a combined dynamical system analysis of both background and perturbation equations in order to examine the validity of this result through an... |
2403.12380 | Daiki Watarai | Daiki Watarai, Naritaka Oshita, Daichi Tsuna | Slowly decaying ringdown of a rapidly spinning black hole II: Inferring
the masses and spins of supermassive black holes with LISA | 16 pages, 11 figures | null | null | RESCEU-5/24, YITP-24-30, RIKEN-iTHEMS-Report-24 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Electromagnetic observations reveal that almost all galaxies have
supermassive black holes (SMBHs) at their centers, but their properties,
especially their spins, are not fully understood. Some of the authors have
recently shown [Oshita and Tsuna (2023)] that rapid spins of $>0.9$, inferred
for masses around $10^7\ M... | [
{
"created": "Tue, 19 Mar 2024 02:46:42 GMT",
"version": "v1"
}
] | 2024-03-20 | [
[
"Watarai",
"Daiki",
""
],
[
"Oshita",
"Naritaka",
""
],
[
"Tsuna",
"Daichi",
""
]
] | Electromagnetic observations reveal that almost all galaxies have supermassive black holes (SMBHs) at their centers, but their properties, especially their spins, are not fully understood. Some of the authors have recently shown [Oshita and Tsuna (2023)] that rapid spins of $>0.9$, inferred for masses around $10^7\ M_\... |
gr-qc/9705060 | Sukratu Barve | Sukratu Barve and T. P. Singh | Naked singularities and the Weyl Curvature Hypothesis | Latex File, 11 pages. The essay (gr-qc/9705057) is based on some of
the detailed calculations in the present paper | null | null | null | gr-qc | null | We examine the growth of the Weyl curvature in two examples of naked
singularity formation in spherical gravitational collapse - dust and the Vaidya
spacetime. We find that the Weyl scalar diverges along outgoing radial null
geodesics as they meet the naked singularity in the past. The implications of
this result for... | [
{
"created": "Thu, 22 May 1997 15:12:22 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Barve",
"Sukratu",
""
],
[
"Singh",
"T. P.",
""
]
] | We examine the growth of the Weyl curvature in two examples of naked singularity formation in spherical gravitational collapse - dust and the Vaidya spacetime. We find that the Weyl scalar diverges along outgoing radial null geodesics as they meet the naked singularity in the past. The implications of this result for t... |
1402.6217 | Yan Wang | Yan Wang | Fast detection and automatic parameter estimation of a gravitational
wave signal with a novel method | 5 pages | null | null | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of gravitational wave usually requires to match the measurement
data with a large number of templates, which is computationally very expensive.
Compressed sensing methods allow one to match the data with a small number of
templates and interpolate the rest. However, the interpolation process is still
co... | [
{
"created": "Tue, 25 Feb 2014 15:56:05 GMT",
"version": "v1"
}
] | 2014-02-26 | [
[
"Wang",
"Yan",
""
]
] | The detection of gravitational wave usually requires to match the measurement data with a large number of templates, which is computationally very expensive. Compressed sensing methods allow one to match the data with a small number of templates and interpolate the rest. However, the interpolation process is still comp... |
1606.07665 | Ettore Minguzzi | E. Minguzzi | The conformal transformation of the night sky | 10 pages. v2: a minimal change in the Introduction | Class. Quantum Grav. 33 (2016) 235009 | 10.1088/0264-9381/33/23/235009 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give a simple differential geometric proof of the conformal transformation
of the night sky under change of observer. The proof does not rely on the four
dimensionality of spacetime or on spinor methods. Furthermore, it really shows
that the result does not depend on Lorentz transformations. This approach, by
givi... | [
{
"created": "Fri, 24 Jun 2016 12:48:56 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Oct 2016 13:47:56 GMT",
"version": "v2"
}
] | 2016-12-02 | [
[
"Minguzzi",
"E.",
""
]
] | We give a simple differential geometric proof of the conformal transformation of the night sky under change of observer. The proof does not rely on the four dimensionality of spacetime or on spinor methods. Furthermore, it really shows that the result does not depend on Lorentz transformations. This approach, by giving... |
gr-qc/0305034 | Stefano Viaggiu | Roberto Bergamini, Stefano Viaggiu | A technique for generating new solutions of Einstein's equations | 18 pages, new corrected version | null | null | null | gr-qc hep-th | null | We present a simple technique for generating new solutions of Einstein's
equations using such function transformations that leave the field equations in
the Ernst form. In this context we recover all the known covariant
transformations of Ernst equations and we find the role of the analytic ones.
Finally we obtain a ... | [
{
"created": "Fri, 9 May 2003 11:07:34 GMT",
"version": "v1"
},
{
"created": "Mon, 12 May 2003 08:57:58 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Bergamini",
"Roberto",
""
],
[
"Viaggiu",
"Stefano",
""
]
] | We present a simple technique for generating new solutions of Einstein's equations using such function transformations that leave the field equations in the Ernst form. In this context we recover all the known covariant transformations of Ernst equations and we find the role of the analytic ones. Finally we obtain a ne... |
gr-qc/9701009 | Subhendra Mohanty | Subhendra Mohanty and A.R. Prasanna | Geodesic Deviation of Photons in Einstein and Higher Derivative Gravity | LaTeX file, 13 pages. Reference added, typos and an arithmetic factor
corrected. Results unchanged. Significance of strong energy condtion pointed
out | null | null | PRL-TH-97/01 | gr-qc hep-th | null | We derive the wave equation obeyed by electromagnetic fields in curved
spacetime. We find that there are Riemann and Ricci curvature coupling terms to
the photon polarisation which result in a polarisation dependent deviation of
the photon trajectories from null geodesics. Photons are found to have an
effective mass ... | [
{
"created": "Tue, 7 Jan 1997 12:11:55 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jan 1997 08:06:26 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Jan 1997 09:23:51 GMT",
"version": "v3"
}
] | 2008-02-03 | [
[
"Mohanty",
"Subhendra",
""
],
[
"Prasanna",
"A. R.",
""
]
] | We derive the wave equation obeyed by electromagnetic fields in curved spacetime. We find that there are Riemann and Ricci curvature coupling terms to the photon polarisation which result in a polarisation dependent deviation of the photon trajectories from null geodesics. Photons are found to have an effective mass in... |
2005.03428 | Valerio Faraoni | Valerio Faraoni | Lagrangian formulation of Omoriis law and analogy with the cosmic Big
Rip | 5 pages, to appear in Eur. Phys. J. C | null | null | null | gr-qc physics.geo-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A recent model predicting Omori's law giving the number of aftershocks per
unit time following an earthquake involves a differential equation analogous to
the Friedmann equation of cosmology. The before-shock phase is analogous to an
accelerating universe approaching a Big Rip, the main shock to the Big Rip
singulari... | [
{
"created": "Thu, 7 May 2020 13:00:47 GMT",
"version": "v1"
}
] | 2020-05-08 | [
[
"Faraoni",
"Valerio",
""
]
] | A recent model predicting Omori's law giving the number of aftershocks per unit time following an earthquake involves a differential equation analogous to the Friedmann equation of cosmology. The before-shock phase is analogous to an accelerating universe approaching a Big Rip, the main shock to the Big Rip singularity... |
1503.07679 | Kiyoshi Shiraishi | Nahomi Kan (Gifu National College of Technology) and Kiyoshi Shiraishi
(Yamaguchi University) | Critical Combinations of Higher Order Terms in Einstein-Maxwell theory
and Compactification | 18 pages, 3 figures | Adv.High Energy Phys. 2015 (2015) 404508 | 10.1155/2015/404508 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the role of a particular combination of higher derivative terms in
higher dimensional theories, especially in the background of spontaneous
compactification. We find that the special extension of Einstein-Maxwell theory
with higher order terms admits interesting cosmological solutions.
| [
{
"created": "Thu, 26 Mar 2015 10:35:47 GMT",
"version": "v1"
}
] | 2018-04-02 | [
[
"Kan",
"Nahomi",
"",
"Gifu National College of Technology"
],
[
"Shiraishi",
"Kiyoshi",
"",
"Yamaguchi University"
]
] | We discuss the role of a particular combination of higher derivative terms in higher dimensional theories, especially in the background of spontaneous compactification. We find that the special extension of Einstein-Maxwell theory with higher order terms admits interesting cosmological solutions. |
gr-qc/0304036 | Kozyrev | S.Kozyrev | On the Stability of Spherically Symmetric Configurations in Newtonian
Limit of Jordan, Brans-Dicke Theory | 11 pages | null | null | null | gr-qc | null | We discuss stability of spherically symmetric static solutions in Newtonian
limit of Jordan, Brans-Dicke field equations. The behavior of the stable
equilibrium solutions for the spherically symmetric configurations considered
here, it emerges that the more compact a model is, the more stable it is.
Moreover, linear ... | [
{
"created": "Tue, 8 Apr 2003 17:04:08 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kozyrev",
"S.",
""
]
] | We discuss stability of spherically symmetric static solutions in Newtonian limit of Jordan, Brans-Dicke field equations. The behavior of the stable equilibrium solutions for the spherically symmetric configurations considered here, it emerges that the more compact a model is, the more stable it is. Moreover, linear st... |
gr-qc/0512151 | Dmitriy Pak | S. W. Kim and D. G. Pak | Lorentz Gauge Gravity and Induced Effective Theories | 6 pages, talk given at International Workshop "Supersymmetries and
Quantum Symmetries", JINR, Dubna, Russia, July 27-31, 2005 | null | null | SNUTP-05-018 | gr-qc | null | We develop the gauge approach based on the Lorentz group to the gravity with
torsion. With a Lagrangian quadratic in curvature we show that the
Einstein-Hilbert action can be induced from a simple gauge model due to quantum
corrections of torsion via formation of a gravito-magnetic condensate. An
effective theory of ... | [
{
"created": "Sun, 25 Dec 2005 07:01:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kim",
"S. W.",
""
],
[
"Pak",
"D. G.",
""
]
] | We develop the gauge approach based on the Lorentz group to the gravity with torsion. With a Lagrangian quadratic in curvature we show that the Einstein-Hilbert action can be induced from a simple gauge model due to quantum corrections of torsion via formation of a gravito-magnetic condensate. An effective theory of co... |
2307.11026 | Farshid Soltani | Farshid Soltani | Global Kruskal-Szekeres coordinates for Reissner-Nordstr\"om spacetime | 10 pages, 5 figures. v2: Added section and references | Phys. Rev. D 108, 124002 (2023) | 10.1103/PhysRevD.108.124002 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | I derive a smooth and global Kruskal-Szekeres coordinate chart for the
maximal extension of the non-extremal Reissner-Nordstr\"om geometry that
provides a generalization to the standard inner and outer Kruskal-Szekeres
coordinates. The Kruskal-Szekeres diagram associated to this coordinate chart,
whose existence is a... | [
{
"created": "Thu, 20 Jul 2023 16:54:20 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Dec 2023 16:05:17 GMT",
"version": "v2"
}
] | 2023-12-04 | [
[
"Soltani",
"Farshid",
""
]
] | I derive a smooth and global Kruskal-Szekeres coordinate chart for the maximal extension of the non-extremal Reissner-Nordstr\"om geometry that provides a generalization to the standard inner and outer Kruskal-Szekeres coordinates. The Kruskal-Szekeres diagram associated to this coordinate chart, whose existence is an ... |
2210.10499 | Yunlong Zheng | Yunlong Zheng and Haomin Rao | Extensions of two-field mimetic gravity | 17 pages, the version accepted by JHEP | JHEP04(2023)042 | 10.1007/JHEP04(2023)042 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Two-field mimetic gravity was recently realized by looking at the singular
limit of the conformal transformation between the auxiliary metric and the
physical metric with two scalar fields involved. In this paper, we reanalyze
the singular conformal limit and find a more general solution for the conformal
factor A, w... | [
{
"created": "Wed, 19 Oct 2022 12:15:33 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Apr 2023 14:29:23 GMT",
"version": "v2"
}
] | 2023-04-13 | [
[
"Zheng",
"Yunlong",
""
],
[
"Rao",
"Haomin",
""
]
] | Two-field mimetic gravity was recently realized by looking at the singular limit of the conformal transformation between the auxiliary metric and the physical metric with two scalar fields involved. In this paper, we reanalyze the singular conformal limit and find a more general solution for the conformal factor A, whi... |
1808.02032 | Masaki Yamada | Alexander Vilenkin and Masaki Yamada | Tunneling wave function of the universe | 17 pages; v2: typos fixed, published version | Phys. Rev. D 98, 066003 (2018) | 10.1103/PhysRevD.98.066003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The tunneling wave function of the universe is investigated in a
minisuperspace framework of a de Sitter universe with a quantum scalar field,
treated as a perturbation. We consider three different approaches to defining
the tunneling wave function: (1) tunneling boundary conditions in superspace,
(2) Lorentzian path... | [
{
"created": "Mon, 6 Aug 2018 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Sep 2018 17:46:38 GMT",
"version": "v2"
}
] | 2018-09-19 | [
[
"Vilenkin",
"Alexander",
""
],
[
"Yamada",
"Masaki",
""
]
] | The tunneling wave function of the universe is investigated in a minisuperspace framework of a de Sitter universe with a quantum scalar field, treated as a perturbation. We consider three different approaches to defining the tunneling wave function: (1) tunneling boundary conditions in superspace, (2) Lorentzian path i... |
1911.08304 | Ritabrata Biswas | Ritabrata Biswas, Promila Biswas and Parthajit Roy | Accretion onto a Quintessence Contaminated Rotating Black Hole :
Violating the Lower Limit for Eta over s | 25 Pages, 80 Figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Viscous accretion flow around a rotating supermassive black hole sitting in a
quintessence tub is studied in this article. To introduce such a dark energy
contaminated black hole's gravitational force, a new pseudo-Newtonian potential
is used. This pseudo-Newtonian force can be calculated if we know the distance
from... | [
{
"created": "Fri, 15 Nov 2019 12:37:14 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Mar 2021 09:09:36 GMT",
"version": "v2"
}
] | 2021-03-03 | [
[
"Biswas",
"Ritabrata",
""
],
[
"Biswas",
"Promila",
""
],
[
"Roy",
"Parthajit",
""
]
] | Viscous accretion flow around a rotating supermassive black hole sitting in a quintessence tub is studied in this article. To introduce such a dark energy contaminated black hole's gravitational force, a new pseudo-Newtonian potential is used. This pseudo-Newtonian force can be calculated if we know the distance from t... |
1110.1736 | Genly Le\'on | Dagoberto Escobar, Carlos R. Fadragas, Genly Leon, and Yoelsy Leyva | Phase space analysis of quintessence fields trapped in a Randall-Sundrum
braneworld: a refined study | 12 pages, 8 figures, one affiliation added, matches the published
version at CQG | Class. Quantum Grav. 29 (2012) 175005 | 10.1088/0264-9381/29/17/175005 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate, from the dynamical systems perspective, the
evolution of an scalar field with arbitrary potential trapped in a
Randall-Sundrum's Braneworld of type II. We consider an homogeneous and
isotropic Friedmann-Robertson-Walker (FRW) brane filled also with a perfect
fluid. Center Manifold Theory... | [
{
"created": "Sat, 8 Oct 2011 13:42:00 GMT",
"version": "v1"
},
{
"created": "Tue, 24 Jan 2012 22:42:06 GMT",
"version": "v2"
},
{
"created": "Thu, 9 Aug 2012 17:19:25 GMT",
"version": "v3"
}
] | 2012-08-10 | [
[
"Escobar",
"Dagoberto",
""
],
[
"Fadragas",
"Carlos R.",
""
],
[
"Leon",
"Genly",
""
],
[
"Leyva",
"Yoelsy",
""
]
] | In this paper we investigate, from the dynamical systems perspective, the evolution of an scalar field with arbitrary potential trapped in a Randall-Sundrum's Braneworld of type II. We consider an homogeneous and isotropic Friedmann-Robertson-Walker (FRW) brane filled also with a perfect fluid. Center Manifold Theory i... |
gr-qc/9810058 | Henk van Elst | Henk van Elst and George F R Ellis (University of Cape Town) | Causal propagation of geometrical fields in relativistic cosmology | 25 pages, RevTeX (10pt), accepted for publication by Physical Review
D | Phys.Rev. D59 (1999) 024013 | 10.1103/PhysRevD.59.024013 | null | gr-qc astro-ph | null | We employ the extended 1+3 orthonormal frame formalism for fluid spacetime
geometries $({\cal M}, {\bf g}, {\bf u})$, which contains the Bianchi field
equations for the Weyl curvature, to derive a 44-D evolution system of
first-order symmetric hyperbolic form for a set of geometrically defined
dynamical field variabl... | [
{
"created": "Sun, 18 Oct 1998 17:23:35 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"van Elst",
"Henk",
"",
"University of Cape Town"
],
[
"Ellis",
"George F R",
"",
"University of Cape Town"
]
] | We employ the extended 1+3 orthonormal frame formalism for fluid spacetime geometries $({\cal M}, {\bf g}, {\bf u})$, which contains the Bianchi field equations for the Weyl curvature, to derive a 44-D evolution system of first-order symmetric hyperbolic form for a set of geometrically defined dynamical field variables... |
1603.09668 | Ulrich Jentschura | J. H. Noble and U. D. Jentschura | Dirac Hamiltonian and Reissner-Nordstrom Metric: Coulomb Interaction in
Curved Space-Time | 11 pages | Phys.Rev.A 93 (2016) 032108 | 10.1103/PhysRevA.93.032108 | null | gr-qc physics.atom-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the spin-1/2 relativistic quantum dynamics in the curved
space-time generated by a central massive charged object (black hole). This
necessitates a study of the coupling of a Dirac particle to the
Reissner-Nordstrom space-time geometry and the simultaneous covariant coupling
to the central electrostati... | [
{
"created": "Thu, 31 Mar 2016 19:18:29 GMT",
"version": "v1"
}
] | 2016-04-01 | [
[
"Noble",
"J. H.",
""
],
[
"Jentschura",
"U. D.",
""
]
] | We investigate the spin-1/2 relativistic quantum dynamics in the curved space-time generated by a central massive charged object (black hole). This necessitates a study of the coupling of a Dirac particle to the Reissner-Nordstrom space-time geometry and the simultaneous covariant coupling to the central electrostatic ... |
2211.10306 | Anthony Brady PhD | Ivan Agullo, Anthony J. Brady, Dimitrios Kranas | Robustness of entanglement in Hawking radiation for optical systems
immersed in thermal baths | 13 + 3 pages, 5 figures. Comments and questions welcome | null | 10.1103/PhysRevD.107.085009 | null | gr-qc cond-mat.other quant-ph | http://creativecommons.org/licenses/by/4.0/ | Entanglement is the quantum signature of Hawking's particle pair-creation
from causal horizons, for gravitational and analog systems alike. Ambient
thermal fluctuations, ubiquitous in realistic situations, strongly affects the
entanglement generated in the Hawking process, completely extinguishing it when
the ambient... | [
{
"created": "Fri, 18 Nov 2022 15:45:38 GMT",
"version": "v1"
}
] | 2023-04-19 | [
[
"Agullo",
"Ivan",
""
],
[
"Brady",
"Anthony J.",
""
],
[
"Kranas",
"Dimitrios",
""
]
] | Entanglement is the quantum signature of Hawking's particle pair-creation from causal horizons, for gravitational and analog systems alike. Ambient thermal fluctuations, ubiquitous in realistic situations, strongly affects the entanglement generated in the Hawking process, completely extinguishing it when the ambient t... |
0901.4910 | Christodoulakis Theodosios | T. Christodoulakis, G. Doulis, Petros A. Terzis, E. Melas, Th.
Grammenos, G.O. Papadopoulos, A. Spanou | Towards Canonical Quantum Gravity for Geometries Admitting Maximally
Symmetric Two-dimensional Surfaces | 27 pages, no figures, LaTex2e source file | Class.Quant.Grav. 27 (2010) 145018 | 10.1088/0264-9381/27/14/145018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 3+1 (canonical) decomposition of all geometries admitting two-dimensional
space-like surfaces is exhibited. A proposal consisting of a specific
re-normalization {\bf Assumption} and an accompanying {\bf Requirement} is put
forward, which enables the canonical quantization of these geometries. The
resulting Wheele... | [
{
"created": "Fri, 30 Jan 2009 15:29:45 GMT",
"version": "v1"
}
] | 2013-05-06 | [
[
"Christodoulakis",
"T.",
""
],
[
"Doulis",
"G.",
""
],
[
"Terzis",
"Petros A.",
""
],
[
"Melas",
"E.",
""
],
[
"Grammenos",
"Th.",
""
],
[
"Papadopoulos",
"G. O.",
""
],
[
"Spanou",
"A.",
""
]
] | The 3+1 (canonical) decomposition of all geometries admitting two-dimensional space-like surfaces is exhibited. A proposal consisting of a specific re-normalization {\bf Assumption} and an accompanying {\bf Requirement} is put forward, which enables the canonical quantization of these geometries. The resulting Wheeler-... |
0805.4465 | J\"org Frauendiener | J. Frauendiener | On the applicability of constrained symplectic integrators in general
relativity | 13 pages, change the title to be more descriptive, typos corrected,
added reference | null | 10.1088/1751-8113/41/38/382005 | null | gr-qc math.NA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The purpose of this note is to point out that a naive application of
symplectic integration schemes for Hamiltonian systems with constraints such as
SHAKE or RATTLE which preserve holonomic constraints encounters difficulties
when applied to the numerical treatment of the equations of general relativity.
| [
{
"created": "Thu, 29 May 2008 03:34:34 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Jul 2008 00:50:48 GMT",
"version": "v2"
}
] | 2009-11-13 | [
[
"Frauendiener",
"J.",
""
]
] | The purpose of this note is to point out that a naive application of symplectic integration schemes for Hamiltonian systems with constraints such as SHAKE or RATTLE which preserve holonomic constraints encounters difficulties when applied to the numerical treatment of the equations of general relativity. |
1611.05327 | Jan Novotn\'y | Zden\v{e}k Stuchl\'ik, Stanislav Hled\'ik, and Jan Novotn\'y | General relativistic polytropes with a repulsive cosmological constant | null | Phys. Rev. D 94, 103513--Published 14 November 2016 | 10.1103/PhysRevD.94.103513 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spherically symmetric equilibrium configurations of perfect fluid obeying a
polytropic equation of state are studied in spacetimes with a repulsive
cosmological constant. The configurations are specified in terms of three
parameters---the polytropic index $n$, the ratio of central pressure and
central energy density ... | [
{
"created": "Tue, 15 Nov 2016 14:53:17 GMT",
"version": "v1"
}
] | 2016-11-17 | [
[
"Stuchlík",
"Zdeněk",
""
],
[
"Hledík",
"Stanislav",
""
],
[
"Novotný",
"Jan",
""
]
] | Spherically symmetric equilibrium configurations of perfect fluid obeying a polytropic equation of state are studied in spacetimes with a repulsive cosmological constant. The configurations are specified in terms of three parameters---the polytropic index $n$, the ratio of central pressure and central energy density of... |
2112.03597 | Manoj Kovalam | Manoj Kovalam, Md Anwarul Kaium Patwary, Anala K Sreekumar, Linqing
Wen, Fiona H Panther and Qi Chu | Early Warnings of Binary Neutron Star Coalescence using the SPIIR Search | null | null | 10.3847/2041-8213/ac5687 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational waves from binary neutron star mergers can be used as alerts to
enable prompt follow-up observations. In particular, capturing prompt
electromagnetic and astroparticle emissions from the moment of a binary merger
presents unique constraints on the time scale and sky localization for online
gravitational... | [
{
"created": "Tue, 7 Dec 2021 09:46:05 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Feb 2022 02:30:44 GMT",
"version": "v2"
}
] | 2022-03-09 | [
[
"Kovalam",
"Manoj",
""
],
[
"Patwary",
"Md Anwarul Kaium",
""
],
[
"Sreekumar",
"Anala K",
""
],
[
"Wen",
"Linqing",
""
],
[
"Panther",
"Fiona H",
""
],
[
"Chu",
"Qi",
""
]
] | Gravitational waves from binary neutron star mergers can be used as alerts to enable prompt follow-up observations. In particular, capturing prompt electromagnetic and astroparticle emissions from the moment of a binary merger presents unique constraints on the time scale and sky localization for online gravitational w... |
2211.06882 | Jie Jiang | Xin-Yang Wang and Jie Jiang | The linearized second law for any higher curvature gravity with the
scalar and the electromagnetic fields | 17 pages | Phys. Rev. D 108, no.6, 064053 (2023) | 10.1103/PhysRevD.108.064053 | null | gr-qc hep-th | http://creativecommons.org/publicdomain/zero/1.0/ | The first law of black hole thermodynamics is suitable for any diffeomorphism
invariant gravity, and the entropy in the first law is the Wald entropy which
is highly dependent on the non-minimal coupling interactions in the theory of
gravity. However, whether the Wald entropy still satisfies the second law needs
to b... | [
{
"created": "Sun, 13 Nov 2022 12:00:52 GMT",
"version": "v1"
}
] | 2023-10-09 | [
[
"Wang",
"Xin-Yang",
""
],
[
"Jiang",
"Jie",
""
]
] | The first law of black hole thermodynamics is suitable for any diffeomorphism invariant gravity, and the entropy in the first law is the Wald entropy which is highly dependent on the non-minimal coupling interactions in the theory of gravity. However, whether the Wald entropy still satisfies the second law needs to be ... |
1606.04358 | Ramil Izmailov | Regina Lukmanova, Alina Khaibullina, Ramil Izmailov, Almir Yanbekov,
Ramis Karimov and Alexander A Potapov | Note on the Schwarzschild-phantom wormhole | 10 pages, 3 figures, Indian J Phys 2016 | null | 10.1007/s12648-016-0874-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, it has been shown by Lobo, Parsaei and Riazi (LPR) that phantom
energy with $\omega =p_{r}/\rho <-1$ could support phantom wormholes. Several
classes of such solutions have been derived by them. While the inner spacetime
is represented by asymptotically flat phantom wormhole that have repulsive
gravity, it ... | [
{
"created": "Mon, 6 Jun 2016 07:47:51 GMT",
"version": "v1"
}
] | 2016-06-15 | [
[
"Lukmanova",
"Regina",
""
],
[
"Khaibullina",
"Alina",
""
],
[
"Izmailov",
"Ramil",
""
],
[
"Yanbekov",
"Almir",
""
],
[
"Karimov",
"Ramis",
""
],
[
"Potapov",
"Alexander A",
""
]
] | Recently, it has been shown by Lobo, Parsaei and Riazi (LPR) that phantom energy with $\omega =p_{r}/\rho <-1$ could support phantom wormholes. Several classes of such solutions have been derived by them. While the inner spacetime is represented by asymptotically flat phantom wormhole that have repulsive gravity, it is... |
gr-qc/0109006 | Hans-Juergen Schmidt | H.-J. Schmidt | Comment on 'Stability of the semiclassical Einstein equation' | 3 pages, LaTeX, reprinted from Phys. Rev. D 50 (1994) 5452 | Phys.Rev. D50 (1994) 5452 | 10.1103/PhysRevD.50.5452 | Report UNIPO-MATH-01-SEP-2 | gr-qc | null | Some mathematical errors of the paper commented upon [W.-M. Suen, Phys. Rev.
D 40, (1989) 315] are corrected.
| [
{
"created": "Tue, 4 Sep 2001 07:31:04 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Schmidt",
"H. -J.",
""
]
] | Some mathematical errors of the paper commented upon [W.-M. Suen, Phys. Rev. D 40, (1989) 315] are corrected. |
2307.13968 | Phongpichit Channuie | Takol Tangphati (Walailak U.), Butsayapat Chaihao (Chula U.), Daris
Samart (Khon Kaen U.), Phongpichit Channuie (Walailak U.), Davood Momeni
(Northern Virginia Community College) | Rotating traversable wormhole geometries in the presence of three-form
fields | v1: 9 pages, 9 figures. arXiv admin note: text overlap with
arXiv:1806.10488 by other authors | Nucl. Phys. B 999 (2024) 116446 | 10.1016/j.nuclphysb.2024.116446 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, we study the rotating wormhole geometries supported by a
three-form field. We demonstrate for particular choices of parameters that it
is possible for the matter fields threading the wormhole to satisfy the null
and weak energy conditions throughout the spacetime, when the three-form field
is present. I... | [
{
"created": "Wed, 26 Jul 2023 05:58:45 GMT",
"version": "v1"
}
] | 2024-01-18 | [
[
"Tangphati",
"Takol",
"",
"Walailak U."
],
[
"Chaihao",
"Butsayapat",
"",
"Chula U."
],
[
"Samart",
"Daris",
"",
"Khon Kaen U."
],
[
"Channuie",
"Phongpichit",
"",
"Walailak U."
],
[
"Momeni",
"Davood",
"",
"Northern V... | In this work, we study the rotating wormhole geometries supported by a three-form field. We demonstrate for particular choices of parameters that it is possible for the matter fields threading the wormhole to satisfy the null and weak energy conditions throughout the spacetime, when the three-form field is present. In ... |
gr-qc/0305048 | Christian Koenigsdoerffer | C. Koenigsdoerffer, G. Faye, G. Schaefer | The binary black-hole dynamics at the third-and-a-half post-Newtonian
order in the ADM-formalism | 20 pages | Phys.Rev.D68:044004,2003 | 10.1103/PhysRevD.68.044004 | null | gr-qc | null | We specialize the radiation-reaction part of the Arnowitt-Deser-Misner (ADM)
Hamiltonian for many non-spinning point-like bodies, calculated by Jaranowski
and Schaefer [1], to third-and-a-half post-Newtonian approximation to general
relativity, to binary systems. This Hamiltonian is used for the computation of
the in... | [
{
"created": "Tue, 13 May 2003 12:02:46 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jun 2003 07:23:47 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Koenigsdoerffer",
"C.",
""
],
[
"Faye",
"G.",
""
],
[
"Schaefer",
"G.",
""
]
] | We specialize the radiation-reaction part of the Arnowitt-Deser-Misner (ADM) Hamiltonian for many non-spinning point-like bodies, calculated by Jaranowski and Schaefer [1], to third-and-a-half post-Newtonian approximation to general relativity, to binary systems. This Hamiltonian is used for the computation of the inst... |
1105.0168 | Philippe G. LeFloch | Annegret Y. Burtscher, James D.E. Grant, and Philippe G. LeFloch | New energy inequalities for tensorial wave equations on spacetimes that
satisfy a one-sided bound | 17 pages | Communications in Partial Differential Equations, Volume 37
(2012), Issue 9, 1596-1619 | 10.1080/03605302.2011.647199 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider several tensorial wave equations, specifically the equations of
Maxwell, Yang-Mills, and Weyl fields, posed on a curved spacetime, and we
establish new energy inequalities under certain one-sided geometric conditions.
Our conditions restrict the lapse function and deformation tensor of the
spacetime folia... | [
{
"created": "Sun, 1 May 2011 13:07:53 GMT",
"version": "v1"
},
{
"created": "Fri, 16 Sep 2011 17:29:05 GMT",
"version": "v2"
},
{
"created": "Sat, 26 Nov 2011 09:18:50 GMT",
"version": "v3"
}
] | 2021-06-17 | [
[
"Burtscher",
"Annegret Y.",
""
],
[
"Grant",
"James D. E.",
""
],
[
"LeFloch",
"Philippe G.",
""
]
] | We consider several tensorial wave equations, specifically the equations of Maxwell, Yang-Mills, and Weyl fields, posed on a curved spacetime, and we establish new energy inequalities under certain one-sided geometric conditions. Our conditions restrict the lapse function and deformation tensor of the spacetime foliati... |
0906.0804 | Valentino Lacquaniti | Valentino Lacquaniti, Giovanni Montani | Geometry and Matter Reduction in a 5D Kaluza-Klein Framework | to appear on IJMPA | Mod. Phys. Lett. A, 24, No. 20 (2009,) pp. 1565-1575 | 10.1142/S0217732309030904 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider the Kaluza-Klein fields equations in presence of a
generic 5D matter tensor which is governed by a conservation equation due to 5D
Bianchi identities. Following a previous work, we provide a consistent approach
to matter where the problem of huge massive modes is removed, without relaxing
th... | [
{
"created": "Thu, 4 Jun 2009 00:38:50 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Lacquaniti",
"Valentino",
""
],
[
"Montani",
"Giovanni",
""
]
] | In this paper we consider the Kaluza-Klein fields equations in presence of a generic 5D matter tensor which is governed by a conservation equation due to 5D Bianchi identities. Following a previous work, we provide a consistent approach to matter where the problem of huge massive modes is removed, without relaxing the ... |
1604.04313 | Gerasimos Rigopoulos | Gerasimos Rigopoulos | Thermal Interpretation of Infrared Dynamics in de Sitter | 8 pages, no figures; v2: 9 pages, no figures, some further
explanation on the decomposition into long and short wavelengths added.
Matches version published in JCAP | JCAP 1607 (2016) no.07, 035 | 10.1088/1475-7516/2016/07/035 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The infrared dynamics of a light, minimally coupled scalar field in de Sitter
spacetime with Ricci curvature $R=12H$, averaged over horizon sized regions of
physical volume $V_H=\frac{4\pi}{3}\left(\frac{1}{H}\right)^3$, can be
interpreted as Brownian motion in a medium with de Sitter temperature
$T_{DS}=\frac{\hbar ... | [
{
"created": "Thu, 14 Apr 2016 22:15:12 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jul 2016 08:57:02 GMT",
"version": "v2"
}
] | 2017-01-06 | [
[
"Rigopoulos",
"Gerasimos",
""
]
] | The infrared dynamics of a light, minimally coupled scalar field in de Sitter spacetime with Ricci curvature $R=12H$, averaged over horizon sized regions of physical volume $V_H=\frac{4\pi}{3}\left(\frac{1}{H}\right)^3$, can be interpreted as Brownian motion in a medium with de Sitter temperature $T_{DS}=\frac{\hbar H}... |
gr-qc/0007049 | Masaru shibata | Masaru Shibata (Osaka & UIUC) | Axisymmetric Simulations of Rotating Stellar Collapse in Full General
Relativity --- Criteria for Prompt Collapse to Black Holes | 41 pages, to appear in Prog. Theor. Phys. 104, August | Prog.Theor.Phys. 104 (2000) 325-358 | 10.1143/PTP.104.325 | null | gr-qc | null | Motivated by a recent paper by the Potsdam numerical relativity group, we
have constructed a new numerical code for hydrodynamic simulation of
axisymmetric systems in full general relativity. In this code, we solve the
Einstein field equation using Cartesian coordinates with appropriate boundary
conditions. On the ot... | [
{
"created": "Wed, 19 Jul 2000 19:06:39 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Shibata",
"Masaru",
"",
"Osaka & UIUC"
]
] | Motivated by a recent paper by the Potsdam numerical relativity group, we have constructed a new numerical code for hydrodynamic simulation of axisymmetric systems in full general relativity. In this code, we solve the Einstein field equation using Cartesian coordinates with appropriate boundary conditions. On the othe... |
2205.09932 | Shinji Tsujikawa | Shinji Tsujikawa | Instability of hairy black holes in regularized 4-dimensional
Einstein-Gauss-Bonnet gravity | 16 pages, no figures | Phys. Lett. B 833 (2022) 137329 | 10.1016/j.physletb.2022.137329 | WUCG-22-04 | gr-qc hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | In regularized 4-dimensional Einstein-Gauss-Bonnet (EGB) gravity derived from
a Kaluza-Klein reduction of higher-dimensional EGB theory, we study the
existence and stability of black hole (BH) solutions on a static and
spherically symmetric background. We show that asymptotically-flat hairy BH
solutions realized for ... | [
{
"created": "Fri, 20 May 2022 02:40:41 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Jul 2022 00:03:15 GMT",
"version": "v2"
}
] | 2022-08-02 | [
[
"Tsujikawa",
"Shinji",
""
]
] | In regularized 4-dimensional Einstein-Gauss-Bonnet (EGB) gravity derived from a Kaluza-Klein reduction of higher-dimensional EGB theory, we study the existence and stability of black hole (BH) solutions on a static and spherically symmetric background. We show that asymptotically-flat hairy BH solutions realized for a ... |
0806.4417 | Philip Charlton | Emmanuel J. Cand\`es, Philip R. Charlton and Hannes Helgason | Gravitational wave detection using multiscale chirplets | 12 pages, 4 figures | Class.Quant.Grav.25:184020,2008 | 10.1088/0264-9381/25/18/184020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A generic `chirp' of the form h(t) = A(t) cos(phi(t)) can be closely
approximated by a connected set of multiscale chirplets with
quadratically-evolving phase. The problem of finding the best approximation to
a given signal using chirplets can be reduced to that of finding the path of
minimum cost in a weighted, dire... | [
{
"created": "Fri, 27 Jun 2008 02:13:53 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Jul 2008 06:43:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Candès",
"Emmanuel J.",
""
],
[
"Charlton",
"Philip R.",
""
],
[
"Helgason",
"Hannes",
""
]
] | A generic `chirp' of the form h(t) = A(t) cos(phi(t)) can be closely approximated by a connected set of multiscale chirplets with quadratically-evolving phase. The problem of finding the best approximation to a given signal using chirplets can be reduced to that of finding the path of minimum cost in a weighted, direct... |
gr-qc/9310035 | John Baez | Louis H. Kauffman | Vassiliev Invariants and the Loop States in Quantum Gravity | 22 pages, to appear in Knots and Quantum Gravity, ed. John Baez,
Oxford University Press, LaTeX | null | null | null | gr-qc | null | An exposition of Vassiliev invariants is given in terms of the simplest
approach to the functional integral construction of link invariants from
Chern-Simons theory. This approach gives the top row evaluations of Vassiliev
invariants for the classical Lie algebras, and a neat point of view on the
results of Bar-Natan... | [
{
"created": "Mon, 25 Oct 1993 18:35:45 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kauffman",
"Louis H.",
""
]
] | An exposition of Vassiliev invariants is given in terms of the simplest approach to the functional integral construction of link invariants from Chern-Simons theory. This approach gives the top row evaluations of Vassiliev invariants for the classical Lie algebras, and a neat point of view on the results of Bar-Natan. ... |
1405.1509 | P. A. Gonzalez | Ramon Becar, P. A. Gonzalez and Y. Vasquez | Dirac quasinormal modes of two-dimensional charged Dilatonic Black Holes | version accepted for publication in EPJC. arXiv admin note:
substantial text overlap with arXiv:1404.5371, arXiv:1404.6023 | null | 10.1140/epjc/s10052-014-2940-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study charged fermionic perturbations in the background of two-dimensional
charged Dilatonic black holes, and we present the exact Dirac quasinormal
modes. Also, we study the stability of these black holes under charged
fermionic perturbations.
| [
{
"created": "Wed, 7 May 2014 05:47:34 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Jun 2014 20:22:14 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Becar",
"Ramon",
""
],
[
"Gonzalez",
"P. A.",
""
],
[
"Vasquez",
"Y.",
""
]
] | We study charged fermionic perturbations in the background of two-dimensional charged Dilatonic black holes, and we present the exact Dirac quasinormal modes. Also, we study the stability of these black holes under charged fermionic perturbations. |
1709.03923 | Kimet Jusufi | Kimet Jusufi, \.Izzet Sakall{\i}, Ali \"Ovg\"un | Quantum Tunneling and Quasinormal Modes in the Spacetime of Alcubierre
Warp Drive | Accepted for publication in General Relativity and Gravitation | Gen Relativ Gravit (2018) 50: 10 | 10.1007/s10714-017-2330-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a seminal paper, Alcubierre showed that Einstein's theory of general
relativity appears to allow a super-luminal motion. In the present study, we
use a recent eternal-warp-drive solution found by Alcubierre to study the
effect of Hawking radiation upon an observer located within the warp drive in
the framework of ... | [
{
"created": "Tue, 12 Sep 2017 15:54:23 GMT",
"version": "v1"
},
{
"created": "Sun, 15 Oct 2017 19:02:31 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Dec 2017 08:26:37 GMT",
"version": "v3"
}
] | 2017-12-12 | [
[
"Jusufi",
"Kimet",
""
],
[
"Sakallı",
"İzzet",
""
],
[
"Övgün",
"Ali",
""
]
] | In a seminal paper, Alcubierre showed that Einstein's theory of general relativity appears to allow a super-luminal motion. In the present study, we use a recent eternal-warp-drive solution found by Alcubierre to study the effect of Hawking radiation upon an observer located within the warp drive in the framework of th... |
gr-qc/9609031 | Karen Brewster | Lee Smolin | Three Dimensional Strings as Collective Coordinates of Four Dimensional
Non-Perturbative Quantum Gravity | 32 pages | null | null | CGPG-96/9-3 | gr-qc hep-th | null | A string theory in $3$ euclidean spacetime dimensions is found to describe
the semiclassical behavior of a certain exact physical state of quantum general
relativity in $4$ dimensions. Both the worldsheet and the three dimensional
metric emerge as collective coordinates that describe a sector of the solution
space of... | [
{
"created": "Thu, 12 Sep 1996 11:44:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Smolin",
"Lee",
""
]
] | A string theory in $3$ euclidean spacetime dimensions is found to describe the semiclassical behavior of a certain exact physical state of quantum general relativity in $4$ dimensions. Both the worldsheet and the three dimensional metric emerge as collective coordinates that describe a sector of the solution space of q... |
2111.06359 | Emmanuil Saridakis | G.G.L. Nashed and Emmanuel N. Saridakis | Stability of motion and thermodynamics in charged black holes in $f(T)$
gravity | 16 pages, 8 figures, version published in JCAP | null | 10.1088/1475-7516/2022/05/017 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the stability of motion and the thermodynamics in the case of
spherically symmetric solutions in $f(T)$ gravity using the perturbative
approach. We consider small deviations from general relativity and we extract
charged black hole solutions for two charge profiles, namely with or without a
perturbativ... | [
{
"created": "Thu, 11 Nov 2021 18:17:54 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Apr 2022 10:00:28 GMT",
"version": "v2"
}
] | 2022-05-18 | [
[
"Nashed",
"G. G. L.",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We investigate the stability of motion and the thermodynamics in the case of spherically symmetric solutions in $f(T)$ gravity using the perturbative approach. We consider small deviations from general relativity and we extract charged black hole solutions for two charge profiles, namely with or without a perturbative ... |
2210.11162 | Amodio Carleo | Amodio Carleo, Gaetano Lambiase, Ali \"Ovg\"un | Non-linear Electrodynamics in Blandford-Znajeck Energy Extraction | 18 pages | ANNALEN DER PHYSIK 2023, 2200635 | 10.1002/andp.202200635 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-linear electrodynamics (NLED) is a generalization of Maxwell's
electrodynamics for strong fields. It could have significant implications for
the study of black holes and cosmology and have been extensively studied in the
literature, extending from quantum to cosmological contexts. Recently, its
application to bla... | [
{
"created": "Thu, 20 Oct 2022 11:00:20 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Feb 2023 18:37:12 GMT",
"version": "v2"
}
] | 2023-04-06 | [
[
"Carleo",
"Amodio",
""
],
[
"Lambiase",
"Gaetano",
""
],
[
"Övgün",
"Ali",
""
]
] | Non-linear electrodynamics (NLED) is a generalization of Maxwell's electrodynamics for strong fields. It could have significant implications for the study of black holes and cosmology and have been extensively studied in the literature, extending from quantum to cosmological contexts. Recently, its application to black... |
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