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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1203.2872 | Alberto Soria | Marc Mars and Alberto Soria | On the Penrose inequality for dust null shells in the Minkowski
spacetime of arbitrary dimension | 25 pages, 2 figures, Latex | null | 10.1088/0264-9381/29/13/135005 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A particular, yet relevant, particular case of the Penrose inequality
involves null shells propagating in the Minkowski spacetime. Despite previous
claims in the literature, the validity of this inequality remains open. In this
paper we rewrite this inequality in terms of the geometry of the surface
obtained by inter... | [
{
"created": "Tue, 13 Mar 2012 17:30:10 GMT",
"version": "v1"
}
] | 2015-06-04 | [
[
"Mars",
"Marc",
""
],
[
"Soria",
"Alberto",
""
]
] | A particular, yet relevant, particular case of the Penrose inequality involves null shells propagating in the Minkowski spacetime. Despite previous claims in the literature, the validity of this inequality remains open. In this paper we rewrite this inequality in terms of the geometry of the surface obtained by interse... |
2405.11488 | Ye Shen | Bin Chen, Yehui Hou, Junyi Li and Ye Shen | Energy Extraction from a Kerr Black Hole via Magnetic Reconnection
within the Plunging Region | null | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Magnetic reconnection within a highly magnetized plasma has been seen as a
viable mechanism to extract the energy from a rotating black hole, as it can
generate negative energy plasmoids in the ergoregion. For a typical accreting
black hole, the ergoregion is filled with bulk plasma plunging from the
innermost-stable... | [
{
"created": "Sun, 19 May 2024 09:15:59 GMT",
"version": "v1"
}
] | 2024-05-21 | [
[
"Chen",
"Bin",
""
],
[
"Hou",
"Yehui",
""
],
[
"Li",
"Junyi",
""
],
[
"Shen",
"Ye",
""
]
] | Magnetic reconnection within a highly magnetized plasma has been seen as a viable mechanism to extract the energy from a rotating black hole, as it can generate negative energy plasmoids in the ergoregion. For a typical accreting black hole, the ergoregion is filled with bulk plasma plunging from the innermost-stable-c... |
2407.09616 | C Fairoos | C. Fairoos, T. K. Safir and Deepak Mishra | Phase-space Path Integral Approach to the Kinetics of Black Hole Phase
Transition in Massive Gravity | 13 pages, 10 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of the state-switching process of black holes in dRGT massive
gravity theory is presented using free energy landscape and stochastic Langevin
equations. The free energy landscape is constructed using the Gibbons-Hawking
path integral method. The black hole phases are characterized by taking its
horizon r... | [
{
"created": "Fri, 12 Jul 2024 18:02:07 GMT",
"version": "v1"
}
] | 2024-07-16 | [
[
"Fairoos",
"C.",
""
],
[
"Safir",
"T. K.",
""
],
[
"Mishra",
"Deepak",
""
]
] | The dynamics of the state-switching process of black holes in dRGT massive gravity theory is presented using free energy landscape and stochastic Langevin equations. The free energy landscape is constructed using the Gibbons-Hawking path integral method. The black hole phases are characterized by taking its horizon rad... |
1110.6768 | Torsten Asselmeyer-Maluga | T. Asselmeyer-Maluga, R. Mader, J. Krol | On 4-dimensional Lorentz-structures, Dark energy and Exotic smoothness | 7 pages, no figures, PACS 04.20.Gz, 98.80.Jk, 95.36.+x an obvious
error in the notation of the hyperbolic 3-manifold was fixed | null | null | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Usually, the topology of a 4-manifolds $M$ is restricted to admit a global
hyperbolic structure $\Sigma\times\mathbb{R}$. The result was obtained by using
two conditions: existence of a Lorentz structure and causality (no time-like
closed curves). In this paper we study the influence of the smoothness
structure to sh... | [
{
"created": "Mon, 31 Oct 2011 12:22:29 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Nov 2011 09:31:30 GMT",
"version": "v2"
}
] | 2011-11-04 | [
[
"Asselmeyer-Maluga",
"T.",
""
],
[
"Mader",
"R.",
""
],
[
"Krol",
"J.",
""
]
] | Usually, the topology of a 4-manifolds $M$ is restricted to admit a global hyperbolic structure $\Sigma\times\mathbb{R}$. The result was obtained by using two conditions: existence of a Lorentz structure and causality (no time-like closed curves). In this paper we study the influence of the smoothness structure to show... |
1602.03883 | Erminia Calabrese | Erminia Calabrese, Nicholas Battaglia, and David N. Spergel | Testing Gravity with Gravitational Wave Source Counts | minor updates to match the version accepted by Classical and Quantum
Gravity | null | 10.1088/0264-9381/33/16/165004 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the gravitational wave source counts distribution can test how
gravitational radiation propagates on cosmological scales. This test does not
require obtaining redshifts for the sources. If the signal-to-noise ratio (SNR,
$\rho$) from a gravitational wave source is proportional to the strain then it
falls... | [
{
"created": "Thu, 11 Feb 2016 20:56:49 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Feb 2016 17:02:27 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Jun 2016 14:38:33 GMT",
"version": "v3"
}
] | 2016-07-27 | [
[
"Calabrese",
"Erminia",
""
],
[
"Battaglia",
"Nicholas",
""
],
[
"Spergel",
"David N.",
""
]
] | We show that the gravitational wave source counts distribution can test how gravitational radiation propagates on cosmological scales. This test does not require obtaining redshifts for the sources. If the signal-to-noise ratio (SNR, $\rho$) from a gravitational wave source is proportional to the strain then it falls a... |
gr-qc/0307042 | Laurent Nottale | Laurent Nottale | The Pioneer anomalous acceleration: can we measure the cosmological
constant at the scale of the solar system ? | 12 pages, updated version, added references, result changed | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An anomalous constant acceleration of (8.7 \pm 1.3) x 10^-8 cm/s^2 directed
toward the Sun has been discovered by Anderson et al. in the motion of the
Pioneer 10/11 and Galileo spacecrafts. In parallel, the WMAP results have
definitively established the existence of a cosmological constant Lambda=1/
L_U^2, and theref... | [
{
"created": "Wed, 9 Jul 2003 16:39:39 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Nov 2011 15:36:45 GMT",
"version": "v2"
}
] | 2011-11-04 | [
[
"Nottale",
"Laurent",
""
]
] | An anomalous constant acceleration of (8.7 \pm 1.3) x 10^-8 cm/s^2 directed toward the Sun has been discovered by Anderson et al. in the motion of the Pioneer 10/11 and Galileo spacecrafts. In parallel, the WMAP results have definitively established the existence of a cosmological constant Lambda=1/ L_U^2, and therefor... |
2206.10417 | Claes Cramer | Claes Cramer | Classical Aspects of a Distributional 3+1 Foam Model | The model and the conclusions are not accurate! | null | null | null | gr-qc math-ph math.MP quant-ph | http://creativecommons.org/licenses/by/4.0/ | A 3+1 spacetime, with a shift vector that is the unique fundamental solution
to the linearized wave operator, is introduced to model an interpretation of
Wheeler's layman's analogy of the Quantum foam. To understand the
distributional aspects of this model is the guaranteed existence of a sequence
of compactly suppor... | [
{
"created": "Tue, 21 Jun 2022 14:16:30 GMT",
"version": "v1"
},
{
"created": "Mon, 8 Aug 2022 15:13:03 GMT",
"version": "v10"
},
{
"created": "Sat, 27 May 2023 04:39:39 GMT",
"version": "v11"
},
{
"created": "Wed, 22 Jun 2022 12:50:53 GMT",
"version": "v2"
},
{
"... | 2023-05-30 | [
[
"Cramer",
"Claes",
""
]
] | A 3+1 spacetime, with a shift vector that is the unique fundamental solution to the linearized wave operator, is introduced to model an interpretation of Wheeler's layman's analogy of the Quantum foam. To understand the distributional aspects of this model is the guaranteed existence of a sequence of compactly supporte... |
2109.00330 | Surojit Dalui | Avijit Bera, Surojit Dalui, Subir Ghosh, Elias C. Vagenas | Quantum corrections enhance chaos: study of particle motion near a
generalized Schwarzschild black hole | 15 pages, 19 figures, revtex4, tltle changed, clarifications added,
now 4 appendices, no change in physics | Phys.Lett.B 829 (2022) 137033 | 10.1016/j.physletb.2022.137033 | null | gr-qc hep-th nlin.CD | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper is devoted to a detailed study of the effects of quantum
corrections on the chaotic behavior in the dynamics of a (massless) probe
particle near the horizon of a generalized Schwarzschild black hole. Two
possible origins inducing the modification of black hole metric are considered
separately; the noncommut... | [
{
"created": "Wed, 1 Sep 2021 12:25:20 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Apr 2022 07:03:06 GMT",
"version": "v2"
}
] | 2022-04-08 | [
[
"Bera",
"Avijit",
""
],
[
"Dalui",
"Surojit",
""
],
[
"Ghosh",
"Subir",
""
],
[
"Vagenas",
"Elias C.",
""
]
] | The paper is devoted to a detailed study of the effects of quantum corrections on the chaotic behavior in the dynamics of a (massless) probe particle near the horizon of a generalized Schwarzschild black hole. Two possible origins inducing the modification of black hole metric are considered separately; the noncommutat... |
2012.08971 | Anil Yadav dr | Anil Kumar Yadav | Reexamining RHDE Models in FRW Universe with two IR cut-off with
redshift parametrization | 4 Pages, 1 Figure | Indian J. Physics 96, 3355 (2022) | 10.1007/s12648-021-02253-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we have investigated that the gravitational field equations
are not compatible with conservation equation in Dixit et al.
\textcolor{blue}{[Dixit et al. Euro. Phys. J. Plus \textbf{135}, 831 (2020)]}.
Therefore, the expression for equation of state parameter along with the
dynamics of $\omega_{T}$ - $\... | [
{
"created": "Tue, 15 Dec 2020 10:19:40 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Jan 2021 07:43:29 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Jun 2021 05:06:04 GMT",
"version": "v3"
}
] | 2023-11-14 | [
[
"Yadav",
"Anil Kumar",
""
]
] | In this paper, we have investigated that the gravitational field equations are not compatible with conservation equation in Dixit et al. \textcolor{blue}{[Dixit et al. Euro. Phys. J. Plus \textbf{135}, 831 (2020)]}. Therefore, the expression for equation of state parameter along with the dynamics of $\omega_{T}$ - $\om... |
gr-qc/0501083 | Daniel Pollack | James Isenberg, David Maxwell and Daniel Pollack | A gluing construction for non-vacuum solutions of the Einstein
constraint equations | null | Adv.Theor.Math.Phys. 9 (2005) 129-172 | null | null | gr-qc math.DG | null | We extend the conformal gluing construction of Isenberg-Mazzeo-Pollack [18]
by establishing an analogous gluing result for field theories obtained by
minimally coupling Einstein's gravitational theory with matter fields. We treat
classical fields such as perfect fluids and the Yang-Mills equations as well as
the Eins... | [
{
"created": "Wed, 26 Jan 2005 22:24:20 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Isenberg",
"James",
""
],
[
"Maxwell",
"David",
""
],
[
"Pollack",
"Daniel",
""
]
] | We extend the conformal gluing construction of Isenberg-Mazzeo-Pollack [18] by establishing an analogous gluing result for field theories obtained by minimally coupling Einstein's gravitational theory with matter fields. We treat classical fields such as perfect fluids and the Yang-Mills equations as well as the Einste... |
1011.2445 | Alexandre Filippov | A.T. Filippov | An old Einstein - Eddington generalized gravity and modern ideas on
branes and cosmology | 13 pages | null | 10.1142/9789814350198_0044 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We briefly discuss new models of an `affine' theory of gravity in
multidimensional space-times with symmetric connections. We use and generalize
Einstein's proposal to specify the space-time geometry by use of the Hamilton
principle to determine the connection coefficients from a geometric Lagrangian
that is an arbit... | [
{
"created": "Wed, 10 Nov 2010 17:51:18 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Filippov",
"A. T.",
""
]
] | We briefly discuss new models of an `affine' theory of gravity in multidimensional space-times with symmetric connections. We use and generalize Einstein's proposal to specify the space-time geometry by use of the Hamilton principle to determine the connection coefficients from a geometric Lagrangian that is an arbitra... |
2306.17505 | Giulio Neri | Giulio Neri and Stefano Liberati | On the resilience of the gravitational variational principle under
renormalization | 27 pages | null | 10.1007/JHEP10(2023)054 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A well-defined variational principle for gravitational actions typically
requires to cancel boundary terms produced by the variation of the bulk action
with a suitable set of boundary counterterms. This can be achieved by carefully
balancing the coefficients multiplying the bulk operators with those
multiplying the b... | [
{
"created": "Fri, 30 Jun 2023 09:36:39 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jul 2023 10:00:21 GMT",
"version": "v2"
}
] | 2024-04-29 | [
[
"Neri",
"Giulio",
""
],
[
"Liberati",
"Stefano",
""
]
] | A well-defined variational principle for gravitational actions typically requires to cancel boundary terms produced by the variation of the bulk action with a suitable set of boundary counterterms. This can be achieved by carefully balancing the coefficients multiplying the bulk operators with those multiplying the bou... |
gr-qc/0011084 | Alejandro Corichi | Alejandro Corichi and Daniel Sudarsky (ICN-UNAM) | Hair from the Isolated Horizon Perspective | 5 pages, no figures. To be published in the proceedings of the 9th
Marcel Grossmann Meeting | null | null | ICN-UNAM-00/15 | gr-qc | null | The recently introduced Isolated Horizons (IH) formalism has become a
powerful tool for realistic black hole physics. In particular, it generalizes
the zeroth and first laws of black hole mechanics in terms of quasi-local
quantities and serves as a starting point for quantum entropy calculations. In
this note we cons... | [
{
"created": "Thu, 23 Nov 2000 23:25:42 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Corichi",
"Alejandro",
"",
"ICN-UNAM"
],
[
"Sudarsky",
"Daniel",
"",
"ICN-UNAM"
]
] | The recently introduced Isolated Horizons (IH) formalism has become a powerful tool for realistic black hole physics. In particular, it generalizes the zeroth and first laws of black hole mechanics in terms of quasi-local quantities and serves as a starting point for quantum entropy calculations. In this note we consid... |
gr-qc/0205029 | Homer G. Ellis | Homer G. Ellis | Space-Time--Time | 29 pages, AMSTeX. This is the original (long) version that
gr-qc/0107023 is based on | null | null | null | gr-qc | null | Space-time--time is a natural hybrid of Kaluza's five-dimensional geometry
and Weyl's conformal space-time geometry. Translations along the secondary time
dimension produce the electromagnetic gauge transformations of Kaluza--Klein
theory and the metric gauge transformations of Weyl theory, related as Weyl
postulated... | [
{
"created": "Wed, 8 May 2002 01:51:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ellis",
"Homer G.",
""
]
] | Space-time--time is a natural hybrid of Kaluza's five-dimensional geometry and Weyl's conformal space-time geometry. Translations along the secondary time dimension produce the electromagnetic gauge transformations of Kaluza--Klein theory and the metric gauge transformations of Weyl theory, related as Weyl postulated. ... |
1405.7249 | Cosimo Bambi | Yue Liu, Daniele Malafarina, Leonardo Modesto, Cosimo Bambi | Singularity avoidance in quantum-inspired inhomogeneous dust collapse | 8 pages, 5 figures. v2: refereed version | Phys. Rev. D 90, 044040 (2014) | 10.1103/PhysRevD.90.044040 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous paper, some of us studied general relativistic homogeneous
gravitational collapses for dust and radiation, in which the density profile
was replaced by an effective density justified by some quantum gravity models.
It was found that the effective density introduces an effective pressure that
becomes neg... | [
{
"created": "Wed, 28 May 2014 14:14:51 GMT",
"version": "v1"
},
{
"created": "Sun, 17 Aug 2014 16:19:27 GMT",
"version": "v2"
}
] | 2014-08-19 | [
[
"Liu",
"Yue",
""
],
[
"Malafarina",
"Daniele",
""
],
[
"Modesto",
"Leonardo",
""
],
[
"Bambi",
"Cosimo",
""
]
] | In a previous paper, some of us studied general relativistic homogeneous gravitational collapses for dust and radiation, in which the density profile was replaced by an effective density justified by some quantum gravity models. It was found that the effective density introduces an effective pressure that becomes negat... |
0906.4263 | Kourosh Nozari | Kourosh Nozari and Narges Rashidi | Modified GBIG Scenario as an Alternative for Dark Energy | 16 pages, 6 figures, Accepted for publication in JCAP | JCAP 0909:014,2009 | 10.1088/1475-7516/2009/09/014 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a DGP-inspired braneworld model where induced gravity on the
brane is modified in the spirit of $f(R)$ gravity and stringy effects are taken
into account by incorporation of the Gauss-Bonnet term in the bulk action. We
explore cosmological dynamics of this model and we show that this scenario is a
succes... | [
{
"created": "Tue, 23 Jun 2009 13:52:05 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Sep 2009 08:53:42 GMT",
"version": "v2"
}
] | 2009-09-28 | [
[
"Nozari",
"Kourosh",
""
],
[
"Rashidi",
"Narges",
""
]
] | We construct a DGP-inspired braneworld model where induced gravity on the brane is modified in the spirit of $f(R)$ gravity and stringy effects are taken into account by incorporation of the Gauss-Bonnet term in the bulk action. We explore cosmological dynamics of this model and we show that this scenario is a successf... |
0804.3075 | Benjamin Knispel | B. Knispel and B. Allen | Blandford's Argument: The Strongest Continuous Gravitational Wave Signal | 12 pages, 6 Figures, published in Phys. Rev. D, v3: final published
version | Phys.Rev.D78:044031,2008 | 10.1103/PhysRevD.78.044031 | AEI-2008-027 | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For a uniform population of neutron stars whose spin-down is dominated by the
emission of gravitational radiation, an old argument of Blandford states that
the expected gravitational-wave amplitude of the nearest source is independent
of the deformation and rotation frequency of the objects. Recent work has
improved ... | [
{
"created": "Fri, 18 Apr 2008 18:01:35 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Apr 2008 06:24:39 GMT",
"version": "v2"
},
{
"created": "Mon, 18 Aug 2008 07:12:55 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Knispel",
"B.",
""
],
[
"Allen",
"B.",
""
]
] | For a uniform population of neutron stars whose spin-down is dominated by the emission of gravitational radiation, an old argument of Blandford states that the expected gravitational-wave amplitude of the nearest source is independent of the deformation and rotation frequency of the objects. Recent work has improved an... |
2303.11232 | Dishari Malakar | Dishari Malakar, K Rajesh Nayak | Possibility of Over-spinning Kerr Blackhole | 6 pages, 4 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We have developed a methodology to test the age-old cosmic censorship
hypothesis in Kerr geometry. We have shown that the Kerr black hole can be
overspun by particles captured from the innermost stable circular orbit.
However, it appears that this does not happen for particles coming from
infinity. We have also obser... | [
{
"created": "Mon, 20 Mar 2023 16:12:43 GMT",
"version": "v1"
}
] | 2023-03-21 | [
[
"Malakar",
"Dishari",
""
],
[
"Nayak",
"K Rajesh",
""
]
] | We have developed a methodology to test the age-old cosmic censorship hypothesis in Kerr geometry. We have shown that the Kerr black hole can be overspun by particles captured from the innermost stable circular orbit. However, it appears that this does not happen for particles coming from infinity. We have also observe... |
2111.09494 | Georgios Mavrogiannis | Georgios Mavrogiannis | Morawetz estimates without relative degeneration and exponential decay
on Schwarzschild-de Sitter spacetimes | 29 pages, 4 figures | null | 10.1007/s00023-023-01293-2 | null | gr-qc math-ph math.AP math.MP | http://creativecommons.org/licenses/by/4.0/ | We use a novel physical space method to prove relatively non-degenerate
integrated energy estimates for the wave equation on subextremal
Schwarzschild-de Sitter spacetimes with parameters $(M,\Lambda)$. These are
integrated decay statements whose bulk energy density, though degenerate at
highest order, is everywhere ... | [
{
"created": "Thu, 18 Nov 2021 03:10:36 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Mavrogiannis",
"Georgios",
""
]
] | We use a novel physical space method to prove relatively non-degenerate integrated energy estimates for the wave equation on subextremal Schwarzschild-de Sitter spacetimes with parameters $(M,\Lambda)$. These are integrated decay statements whose bulk energy density, though degenerate at highest order, is everywhere co... |
gr-qc/0309131 | Eugen Radu | Dumitru Astefanesei, Eugen Radu | Boson stars with negative cosmological constant | 33 pages, 14 eps figures; to be published in Nucl. Phys. B | Nucl.Phys. B665 (2003) 594-622 | 10.1016/S0550-3213(03)00482-6 | FREIBURG-THEP-03-15 | gr-qc hep-th | null | We consider boson star solutions in a $D$-dimensional, asymptotically anti-de
Sitter spacetime and investigate the influence of the cosmological term on
their properties. We find that for $D>4$ the boson star properties are close to
those in four dimensions with a vanishing cosmological constant. A different
behavior... | [
{
"created": "Mon, 29 Sep 2003 12:46:41 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Astefanesei",
"Dumitru",
""
],
[
"Radu",
"Eugen",
""
]
] | We consider boson star solutions in a $D$-dimensional, asymptotically anti-de Sitter spacetime and investigate the influence of the cosmological term on their properties. We find that for $D>4$ the boson star properties are close to those in four dimensions with a vanishing cosmological constant. A different behavior i... |
gr-qc/0404030 | Giovanni Montani | Giovanni Montani | A Scenario for the Dimensional Compactification in Eleven-Dimensional
Space-Time | 8 pages, no figures, to appear on Int. Journal of Mod. Phys. D | Int.J.Mod.Phys. D13 (2004) 1029-1036 | 10.1142/S0218271804004967 | null | gr-qc astro-ph | null | We discuss the inhomogeneous multidimensional mixmaster model in view of
appearing, near the cosmological singularity, a scenario for the dimensional
compactification in correspondence to an 11-dimensional space-time. Our
analysis candidates such a collapsing picture toward the singularity to
describe the actual expa... | [
{
"created": "Wed, 7 Apr 2004 09:56:57 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Montani",
"Giovanni",
""
]
] | We discuss the inhomogeneous multidimensional mixmaster model in view of appearing, near the cosmological singularity, a scenario for the dimensional compactification in correspondence to an 11-dimensional space-time. Our analysis candidates such a collapsing picture toward the singularity to describe the actual expand... |
1811.10303 | Alfonso Garc\'ia-Parrado G\'omez-Lobo Dr. | Alfonso Garc\'ia-Parrado and Filipe C. Mena | Gravitational radiation and the evolution of gravitational collapse in
cylindrical symmetry | 15 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using the Sparling form and a geometric construction adapted to spacetimes
with a 2-dimensional isometry group, we analyse a quasi-local measure of
gravitational energy. We then study the gravitational radiation through
spacetime junctions in cylindrically symmetric models of gravitational collapse
to singularities. ... | [
{
"created": "Mon, 26 Nov 2018 11:44:16 GMT",
"version": "v1"
}
] | 2018-11-27 | [
[
"García-Parrado",
"Alfonso",
""
],
[
"Mena",
"Filipe C.",
""
]
] | Using the Sparling form and a geometric construction adapted to spacetimes with a 2-dimensional isometry group, we analyse a quasi-local measure of gravitational energy. We then study the gravitational radiation through spacetime junctions in cylindrically symmetric models of gravitational collapse to singularities. Th... |
1002.1129 | Shankaranarayanan S | Saurya Das, S. Shankaranarayanan, Sourav Sur | Entanglement and corrections to Bekenstein-Hawking entropy | 3 Pages, 1 Figure, Talk given by SSh at the 12th Marcel Grossmann
meeting | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this talk, we focus on the corrections to Bekenstein-Hawking entropy by
associating it with the entanglement between degrees of freedom inside and
outside the horizon. Using numerical techniques, we show that the corrections
proportional to fractional power of area result when the field is in a
superposition of gr... | [
{
"created": "Fri, 5 Feb 2010 05:51:03 GMT",
"version": "v1"
}
] | 2010-03-05 | [
[
"Das",
"Saurya",
""
],
[
"Shankaranarayanan",
"S.",
""
],
[
"Sur",
"Sourav",
""
]
] | In this talk, we focus on the corrections to Bekenstein-Hawking entropy by associating it with the entanglement between degrees of freedom inside and outside the horizon. Using numerical techniques, we show that the corrections proportional to fractional power of area result when the field is in a superposition of grou... |
2308.06941 | Bivudutta Mishra Dr. | Abhilipsa Sahoo, S.K. Tripathy, B. Mishra, Saibal Ray | Casimir wormhole with GUP correction in extended symmetric teleparallel
gravity | 14 pages, 7 figures | Eur. Phys. J. C (2024) 84:325 | 10.1140/epjc/s10052-024-12638-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum mechanical concept such as the Casimir effect is explored to model
traversable wormholes in an extended teleparallel gravity theory. The minimal
length concept leading to the generalized uncertainty principle (GUP) is used
to obtain the Casimir energy density. The effect of the GUP correction in the
geometric... | [
{
"created": "Mon, 14 Aug 2023 05:16:15 GMT",
"version": "v1"
}
] | 2024-04-09 | [
[
"Sahoo",
"Abhilipsa",
""
],
[
"Tripathy",
"S. K.",
""
],
[
"Mishra",
"B.",
""
],
[
"Ray",
"Saibal",
""
]
] | Quantum mechanical concept such as the Casimir effect is explored to model traversable wormholes in an extended teleparallel gravity theory. The minimal length concept leading to the generalized uncertainty principle (GUP) is used to obtain the Casimir energy density. The effect of the GUP correction in the geometrical... |
1305.7374 | J. Navarro-Salas | Aitor Landete, Jose Navarro-Salas and Francisco Torrenti | Adiabatic regularization for spin-1/2 fields | A new section has been added | Physical Review D (Rapid Communications) 061501(R), 2013 | 10.1103/PhysRevD.88.061501 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the adiabatic regularization method to spin-1/2 fields. The ansatz
for the adiabatic expansion for fermionic modes differs significantly from the
WKB-type template that works for scalar modes. We give explicit expressions for
the first adiabatic orders and analyze particle creation in de Sitter
spacetime. A... | [
{
"created": "Fri, 31 May 2013 12:06:48 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Sep 2013 06:19:05 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Landete",
"Aitor",
""
],
[
"Navarro-Salas",
"Jose",
""
],
[
"Torrenti",
"Francisco",
""
]
] | We extend the adiabatic regularization method to spin-1/2 fields. The ansatz for the adiabatic expansion for fermionic modes differs significantly from the WKB-type template that works for scalar modes. We give explicit expressions for the first adiabatic orders and analyze particle creation in de Sitter spacetime. As ... |
gr-qc/0309004 | Scott Funkhouser | Scott Funkhouser | An Inertial Reaction to Cosmological Accelerations | 3 pages; 1 Fig.; removed section on Sciama's force law; no change in
main result | null | null | null | gr-qc astro-ph | null | Mach's "fixed stars" are actually not fixed at all. The distant clusters of
galaxies are not only receding from each observer but they are also
accelerating since the rate of cosmological expansion is not constant. If the
distant cosmic masses in someway constitute the frame of inertial reference
then an additional f... | [
{
"created": "Mon, 1 Sep 2003 13:33:43 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Sep 2003 16:38:49 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Sep 2003 05:53:28 GMT",
"version": "v3"
},
{
"created": "Wed, 12 Jan 2005 00:48:24 GMT",
"version": "v4"
},
{
"crea... | 2007-05-23 | [
[
"Funkhouser",
"Scott",
""
]
] | Mach's "fixed stars" are actually not fixed at all. The distant clusters of galaxies are not only receding from each observer but they are also accelerating since the rate of cosmological expansion is not constant. If the distant cosmic masses in someway constitute the frame of inertial reference then an additional for... |
1702.00478 | Omar Edel Nu\~nez Soltero | J. Socorro and Omar E. N\'u\~nez | Scalar potentials with Multi-scalar fields from quantum cosmology and
supersymmetric quantum mechanics | 12 pages, send for reviewing to The European Physical Journal Plus on
January 2017 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Multi-scalar field cosmology of the anisotropic Bianchi type I model is
used in order to construct a family of potentials that are the best suited to
model the inflation phenomenon. We employ the quantum potential approach to
quantum mechanics due to Bohm in order to solve the corresponding
Wheeler-DeWitt equatio... | [
{
"created": "Wed, 1 Feb 2017 22:17:33 GMT",
"version": "v1"
}
] | 2017-02-03 | [
[
"Socorro",
"J.",
""
],
[
"Núñez",
"Omar E.",
""
]
] | The Multi-scalar field cosmology of the anisotropic Bianchi type I model is used in order to construct a family of potentials that are the best suited to model the inflation phenomenon. We employ the quantum potential approach to quantum mechanics due to Bohm in order to solve the corresponding Wheeler-DeWitt equation;... |
1008.4763 | Mubasher Jamil | M.R. Setare and Mubasher Jamil | Statefinder diagnostic and stability of modified gravity consistent with
holographic and new agegraphic dark energy | 12 pages, 2 figures, accepted by Gen. Relativ. Gravit | Gen. Relativ. Gravit. (2011) 43:293-303 | 10.1007/s10714-010-1087-0 | arXiv:1008.4763v1 [gr-qc] | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently one of us derived the action of modified gravity consistent with the
holographic and new-agegraphic dark energy. In this paper, we investigate the
stability of the Lagrangians of the modified gravity as discussed in [M. R.
Setare, Int. J. Mod. Phys. D 17 (2008) 2219; M. R. Setare, Astrophys. Space
Sci. 326 (... | [
{
"created": "Fri, 27 Aug 2010 16:53:43 GMT",
"version": "v1"
}
] | 2011-01-04 | [
[
"Setare",
"M. R.",
""
],
[
"Jamil",
"Mubasher",
""
]
] | Recently one of us derived the action of modified gravity consistent with the holographic and new-agegraphic dark energy. In this paper, we investigate the stability of the Lagrangians of the modified gravity as discussed in [M. R. Setare, Int. J. Mod. Phys. D 17 (2008) 2219; M. R. Setare, Astrophys. Space Sci. 326 (20... |
0812.0864 | Molin Liu | Molin Liu, Yuanxing Gui and Hongya Liu | Quantum Statistical Entropy and Minimal Length of 5D Ricci-flat Black
String with Generalized Uncertainty Principle | 11pages and this work is dedicated to the memory of Professor Hongya
Liu | Phys.Rev.D78:124003,2008 | 10.1103/PhysRevD.78.124003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the quantum statistical entropy in a 5D Ricci-flat
black string solution, which contains a 4D Schwarzschild-de Sitter black hole
on the brane, by using the improved thin-layer method with the generalized
uncertainty principle. The entropy is the linear sum of the areas of the event
horizon and... | [
{
"created": "Thu, 4 Dec 2008 05:42:27 GMT",
"version": "v1"
}
] | 2008-12-18 | [
[
"Liu",
"Molin",
""
],
[
"Gui",
"Yuanxing",
""
],
[
"Liu",
"Hongya",
""
]
] | In this paper, we study the quantum statistical entropy in a 5D Ricci-flat black string solution, which contains a 4D Schwarzschild-de Sitter black hole on the brane, by using the improved thin-layer method with the generalized uncertainty principle. The entropy is the linear sum of the areas of the event horizon and t... |
2311.08341 | Ernesto Contreras | J. Palacios, A. Di Teodoro, E. fuenmayor and E. Contreras | A fractional matter sector for general relativity | null | Eur. Phys. J. C 83, 894 (2023) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we construct a fractional matter sector for general relativity.
In particular, we propose a suitable fractional anisotropy function relating
both the tangential and radial pressure of a spherically symmetric fluid based
on the Gr\"unwald-Letnikov fractional derivative. The system is closed by
implementi... | [
{
"created": "Tue, 14 Nov 2023 17:36:33 GMT",
"version": "v1"
}
] | 2023-11-15 | [
[
"Palacios",
"J.",
""
],
[
"Di Teodoro",
"A.",
""
],
[
"fuenmayor",
"E.",
""
],
[
"Contreras",
"E.",
""
]
] | In this work, we construct a fractional matter sector for general relativity. In particular, we propose a suitable fractional anisotropy function relating both the tangential and radial pressure of a spherically symmetric fluid based on the Gr\"unwald-Letnikov fractional derivative. The system is closed by implementing... |
1506.08384 | Johannes Th\"urigen | Johannes Th\"urigen | Group field theories generating polyhedral complexes | accepted for publication in PoS, Frontiers of Fundamental Physics 14
(AMU Marseille) | PoS(FFP14)177, 2015 | 10.22323/1.224.0177 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Group field theories are a generalization of matrix models which provide both
a second quantized reformulation of loop quantum gravity as well as generating
functions for spin foam models. While states in canonical loop quantum gravity,
in the traditional continuum setting, are based on graphs with vertices of
arbitr... | [
{
"created": "Sun, 28 Jun 2015 11:38:37 GMT",
"version": "v1"
}
] | 2018-08-01 | [
[
"Thürigen",
"Johannes",
""
]
] | Group field theories are a generalization of matrix models which provide both a second quantized reformulation of loop quantum gravity as well as generating functions for spin foam models. While states in canonical loop quantum gravity, in the traditional continuum setting, are based on graphs with vertices of arbitrar... |
0903.2438 | Jorge Pullin | Rodolfo Gambini and Jorge Pullin | Quantum cosmic censor: gravitation makes reality undecidable | 3 Pages, This essay received an honorable mention from the Gravity
Research Foundation essay competition in 2008 | Int. J. Mod. Phys. D17, 2535-2538 (2008) | 10.1142/S0218271808014047 | LSU-REL031309 | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | When one takes into account gravitation, the measurement of space and time
cannot be carried out with infinite accuracy. When quantum mechanics is
reformulated taking into account this lack of accuracy, the resolution of the
measurement problem can be implemented via decoherence without the usual
pitfalls. The result... | [
{
"created": "Fri, 13 Mar 2009 17:25:45 GMT",
"version": "v1"
}
] | 2009-03-16 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Pullin",
"Jorge",
""
]
] | When one takes into account gravitation, the measurement of space and time cannot be carried out with infinite accuracy. When quantum mechanics is reformulated taking into account this lack of accuracy, the resolution of the measurement problem can be implemented via decoherence without the usual pitfalls. The resultin... |
0808.3701 | Kourosh Nozari | Kourosh Nozari and Mahin Pourghasemi | Crossing the Phantom Divide Line in a DGP-Inspired $F(R,\phi)$-Gravity | 23 Pages, 10 figs, Submitted to JCAP | JCAP 10 (2008) 044 | 10.1088/1475-7516/2008/10/044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study possible crossing of the phantom divide line in a DGP-inspired
$F(R,\phi)$ braneworld scenario where scalar field and curvature quintessence
are treated in a unified framework. With some specific form of $F(R,\phi)$ and
by adopting a suitable ansatz, we show that there are appropriate regions of
the paramete... | [
{
"created": "Wed, 27 Aug 2008 13:22:34 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Nozari",
"Kourosh",
""
],
[
"Pourghasemi",
"Mahin",
""
]
] | We study possible crossing of the phantom divide line in a DGP-inspired $F(R,\phi)$ braneworld scenario where scalar field and curvature quintessence are treated in a unified framework. With some specific form of $F(R,\phi)$ and by adopting a suitable ansatz, we show that there are appropriate regions of the parameters... |
1708.06310 | Salvatore Capozziello | Sebastian Bahamonde, Salvatore Capozziello, and Konstantinos F.
Dialektopoulos | Constraining Generalized Non-local Cosmology from Noether Symmetries | 15 pages, to be published in Eur.Phys.J. C | null | 10.1140/epjc/s10052-017-5283-x | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a generalized nonlocal theory of gravity which, in specific limits,
can become either the curvature non-local or teleparallel non-local theory.
Using the Noether Symmetry Approach, we find that the coupling functions coming
from the non-local terms are constrained to be either exponential or linear in
form. ... | [
{
"created": "Mon, 21 Aug 2017 16:15:09 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Oct 2017 07:28:50 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Bahamonde",
"Sebastian",
""
],
[
"Capozziello",
"Salvatore",
""
],
[
"Dialektopoulos",
"Konstantinos F.",
""
]
] | We study a generalized nonlocal theory of gravity which, in specific limits, can become either the curvature non-local or teleparallel non-local theory. Using the Noether Symmetry Approach, we find that the coupling functions coming from the non-local terms are constrained to be either exponential or linear in form. It... |
2407.09914 | Liu Zhao | Yifan Cai, Tao Wang and Liu Zhao | Fluctuation theorems in general relativistic stochastic thermodynamics | 30 pages, 2 figures. v2: fixed a typo and updated the detail of a
reference | null | null | null | gr-qc cond-mat.stat-mech | http://creativecommons.org/licenses/by/4.0/ | Based on the recently proposed framework of general relativistic stochastic
mechanics and stochastic thermodynamics at the ensemble level, this work
focuses on general relativistic stochastic thermodynamics at the trajectory
level. The first law of stochastic thermodynamics is reformulated and the
fluctuation theorem... | [
{
"created": "Sat, 13 Jul 2024 15:16:26 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Jul 2024 10:46:49 GMT",
"version": "v2"
}
] | 2024-07-17 | [
[
"Cai",
"Yifan",
""
],
[
"Wang",
"Tao",
""
],
[
"Zhao",
"Liu",
""
]
] | Based on the recently proposed framework of general relativistic stochastic mechanics and stochastic thermodynamics at the ensemble level, this work focuses on general relativistic stochastic thermodynamics at the trajectory level. The first law of stochastic thermodynamics is reformulated and the fluctuation theorems ... |
1310.0023 | Joao Morais | Joao Morais, Mariam Bouhmadi-Lopez, Alfredo B. Henriques | The energy spectrum of gravitational waves in a loop quantum
cosmological model | 8 pages, 4 figures. RevTex4-1 Expanded version. Version accepted in
PRD | Phys. Rev. D 89, 023513 (2014) | 10.1103/PhysRevD.89.023513 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the consequences of loop quantum cosmology (inverse-volume
corrections) in the spectrum of the gravitational waves using the method of the
Bogoliubov coefficients. These corrections are taken into account at the
background level of the theory as well as at the first order in the
perturbations theory framew... | [
{
"created": "Mon, 30 Sep 2013 20:00:17 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Dec 2013 13:27:12 GMT",
"version": "v2"
}
] | 2014-01-22 | [
[
"Morais",
"Joao",
""
],
[
"Bouhmadi-Lopez",
"Mariam",
""
],
[
"Henriques",
"Alfredo B.",
""
]
] | We explore the consequences of loop quantum cosmology (inverse-volume corrections) in the spectrum of the gravitational waves using the method of the Bogoliubov coefficients. These corrections are taken into account at the background level of the theory as well as at the first order in the perturbations theory framewor... |
2301.08876 | Pardyumn Kumar Sahoo | Gaurav N. Gadbail, Simran Arora, P.K. Sahoo | Reconstruction of $f(Q,T)$ Lagrangian for various cosmological scenario | PLB published version | Physics Letters B, 838 (2023) 137710 | 10.1016/j.physletb.2023.137710 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The variety of theories that can account for the dark energy phenomenon
encourages current research to concentrate on a more in-depth examination of
the potential impacts of modified gravity on both local and cosmic scales. We
discuss some cosmological reconstruction in $f(Q,T)$ cosmology (where $Q$ is
the non-metric... | [
{
"created": "Sat, 21 Jan 2023 03:46:05 GMT",
"version": "v1"
}
] | 2023-01-27 | [
[
"Gadbail",
"Gaurav N.",
""
],
[
"Arora",
"Simran",
""
],
[
"Sahoo",
"P. K.",
""
]
] | The variety of theories that can account for the dark energy phenomenon encourages current research to concentrate on a more in-depth examination of the potential impacts of modified gravity on both local and cosmic scales. We discuss some cosmological reconstruction in $f(Q,T)$ cosmology (where $Q$ is the non-metricit... |
2401.01821 | Francisco Lobo | Ednaldo L. B. Junior, Jos\'e Tarciso S. S. Junior, Francisco S. N.
Lobo, Manuel E. Rodrigues, Lu\'is F. Dias da Silva, Henrique A. Vieira | Observations on the massive particle surface method | 15 pages, 1 figure; comments are welcome | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geodesic method has played a crucial role in understanding the circular
orbits generated by compact objects, culminating in the definition of the
photon sphere, which was later generalized to a photon surface in arbitrary
spacetimes. This new formulation extends the concept of the photon sphere in a
broader sense... | [
{
"created": "Wed, 3 Jan 2024 16:28:05 GMT",
"version": "v1"
}
] | 2024-01-04 | [
[
"Junior",
"Ednaldo L. B.",
""
],
[
"Junior",
"José Tarciso S. S.",
""
],
[
"Lobo",
"Francisco S. N.",
""
],
[
"Rodrigues",
"Manuel E.",
""
],
[
"da Silva",
"Luís F. Dias",
""
],
[
"Vieira",
"Henrique A.",
""
]
] | The geodesic method has played a crucial role in understanding the circular orbits generated by compact objects, culminating in the definition of the photon sphere, which was later generalized to a photon surface in arbitrary spacetimes. This new formulation extends the concept of the photon sphere in a broader sense, ... |
gr-qc/9510001 | Grisha Volovik | G.E. Volovik (Low Temperature Laboratory, Helsinki University of
Technology, Finland and L.D. Landau Institute for Theoretical Physics,
Moscow, Russia) | Is there analogy between quantized vortex and black hole? | Revised to improve clarity and physical content 27 pages, LaTeX file,
3 figures are available at
ftp://boojum.hut.fi/pub/publications/lowtemp/LTL-95006.ps | null | null | LTL-95006 | gr-qc | null | An attempt is made to promote an analogy between quantized vortex in
condensed matter and black hole: both compact objects have fermion zero modes
which induce the finite temperature of these objects. The motion of the
quantized vortex lines in Fermi superfluids and superconductors leads to the
spectral flow of fermi... | [
{
"created": "Mon, 2 Oct 1995 16:20:32 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Nov 1995 14:54:40 GMT",
"version": "v2"
}
] | 2009-09-25 | [
[
"Volovik",
"G. E.",
"",
"Low Temperature Laboratory, Helsinki University of\n Technology, Finland and L.D. Landau Institute for Theoretical Physics,\n Moscow, Russia"
]
] | An attempt is made to promote an analogy between quantized vortex in condensed matter and black hole: both compact objects have fermion zero modes which induce the finite temperature of these objects. The motion of the quantized vortex lines in Fermi superfluids and superconductors leads to the spectral flow of fermion... |
1111.6025 | Nigel Bishop | P.J. van der Walt and N.T. Bishop | Observational cosmology using characteristic numerical relativity:
Characteristic formalism on null geodesics | 18 pages, 9 figures, 1 Table. arXiv admin note: some text overlap
with arXiv:some 1007.3189 | null | 10.1103/PhysRevD.85.044016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The characteristic formalism of numerical relativity is based on a system of
coordinates aligned with outgoing null cones. While these coordinates were
designed for studying gravitational waves, they can also be easily adapted to
model cosmological past null cones (PNCs). Similar to observational coordinates
in the o... | [
{
"created": "Fri, 25 Nov 2011 15:33:45 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"van der Walt",
"P. J.",
""
],
[
"Bishop",
"N. T.",
""
]
] | The characteristic formalism of numerical relativity is based on a system of coordinates aligned with outgoing null cones. While these coordinates were designed for studying gravitational waves, they can also be easily adapted to model cosmological past null cones (PNCs). Similar to observational coordinates in the obs... |
1602.04764 | John Ellis | John Ellis, Nick E. Mavromatos, Dimitri V. Nanopoulos | Comments on Graviton Propagation in Light of GW150914 | 9 pages, no figures; v2 contains additional description and a Noted
Added about constraints from GW151226 | Mod. Phys. Lett. A, Vol. 31, No. 26 (2016) 1650155 | 10.1142/S0217732316750018 | KCL-PH-TH/2016-06, LCTS/2016-04, CERN-TH/2016-032, ACT-02-16,
MI-TH-1608 | gr-qc astro-ph.CO astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of gravitational waves from the Laser Interferometer
Gravitational-Wave Observatory (LIGO) event GW150914 may be used to constrain
the possibility of Lorentz violation in graviton propagation, and the
observation by the Fermi Gamma-Ray Burst Monitor of a transient source in
apparent coincidence may be... | [
{
"created": "Mon, 15 Feb 2016 18:52:37 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Jun 2016 16:44:46 GMT",
"version": "v2"
}
] | 2016-08-03 | [
[
"Ellis",
"John",
""
],
[
"Mavromatos",
"Nick E.",
""
],
[
"Nanopoulos",
"Dimitri V.",
""
]
] | The observation of gravitational waves from the Laser Interferometer Gravitational-Wave Observatory (LIGO) event GW150914 may be used to constrain the possibility of Lorentz violation in graviton propagation, and the observation by the Fermi Gamma-Ray Burst Monitor of a transient source in apparent coincidence may be u... |
1404.3163 | Gilberto Medeiros Kremer | Marlos O. Ribas, Pedro Zambianchi Jr., Fernando P. Devecchi and
Gilberto M. Kremer | Exit from accelerated regimes by symmetry breaking in a universe filled
with fermionic and bosonic sources | 9 pages, 2 figures, to be published in Modern Physics Letters A | Mod. Phys. Lett. A, Vol. 29, No. 17 (2014) 1450086 | 10.1142/S0217732314500862 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate a universe filled with a fermionic field and a
complex scalar field, exchanging energy through a Yukawa potential; the model
encodes a symmetry breaking mechanism (on the bosonic sector). In a first case,
when the mechanism is not included, the cosmological model furnishes a pure
accelerat... | [
{
"created": "Fri, 11 Apr 2014 17:33:53 GMT",
"version": "v1"
}
] | 2014-05-23 | [
[
"Ribas",
"Marlos O.",
""
],
[
"Zambianchi",
"Pedro",
"Jr."
],
[
"Devecchi",
"Fernando P.",
""
],
[
"Kremer",
"Gilberto M.",
""
]
] | In this work we investigate a universe filled with a fermionic field and a complex scalar field, exchanging energy through a Yukawa potential; the model encodes a symmetry breaking mechanism (on the bosonic sector). In a first case, when the mechanism is not included, the cosmological model furnishes a pure accelerated... |
gr-qc/0512135 | R. R. Cuzinatto | R. Aldrovandi, R. R. Cuzinatto and L. G. Medeiros | Cosmic Acceleration from Elementary Interactions | 4 pages, 3 figures, 1 table | null | null | null | gr-qc | null | It is possible to generate an accelerated period of expansion from reasonable
potentials acting between the universe particle constituents. The pressure of
primordial nucleons interacting via a simple nuclear potential is obtained via
Mayer's cluster expansion technique. The attractive part of the potential
engenders... | [
{
"created": "Thu, 22 Dec 2005 20:27:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Aldrovandi",
"R.",
""
],
[
"Cuzinatto",
"R. R.",
""
],
[
"Medeiros",
"L. G.",
""
]
] | It is possible to generate an accelerated period of expansion from reasonable potentials acting between the universe particle constituents. The pressure of primordial nucleons interacting via a simple nuclear potential is obtained via Mayer's cluster expansion technique. The attractive part of the potential engenders a... |
gr-qc/9307023 | Adam Helfer | Adam D. Helfer | How to Estimate Energy Lost to Gravitational Waves (revised) | 12 pages, plain Tex | Phys.Rev. D48 (1993) 3625-3629 | 10.1103/PhysRevD.48.3625 | null | gr-qc | null | The energy--momentum radiated in gravitational waves by an isolated source is
given by a formula of Bondi. This formula is highly non--local: the
energy--momentum is not given as the integral of a well--defined local density.
It has therefore been unclear whether the Bondi formula can be used to get
information from ... | [
{
"created": "Mon, 19 Jul 1993 16:18:39 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Helfer",
"Adam D.",
""
]
] | The energy--momentum radiated in gravitational waves by an isolated source is given by a formula of Bondi. This formula is highly non--local: the energy--momentum is not given as the integral of a well--defined local density. It has therefore been unclear whether the Bondi formula can be used to get information from gr... |
gr-qc/0210028 | Naoki Seto | Naoki Seto | Effects of finite arm-length of LISA on analysis of gravitational waves
from MBH binaries | 10 pages, 3 figures, to appear in Phys.Rev.D | Phys.Rev. D66 (2002) 122001 | 10.1103/PhysRevD.66.122001 | null | gr-qc astro-ph | null | Response of an interferometer becomes complicated for gravitational wave
shorter than the arm-length of the detector, as nature of wave appears
strongly. We have studied how parameter estimation for merging massive black
hole binaries are affected by this complicated effect in the case of LISA. It
is shown that three... | [
{
"created": "Wed, 9 Oct 2002 12:00:59 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Seto",
"Naoki",
""
]
] | Response of an interferometer becomes complicated for gravitational wave shorter than the arm-length of the detector, as nature of wave appears strongly. We have studied how parameter estimation for merging massive black hole binaries are affected by this complicated effect in the case of LISA. It is shown that three d... |
gr-qc/0505082 | Badri Krishnan | Curt Cutler, Iraj Gholami and Badri Krishnan | Improved Stack-Slide Searches for Gravitational-Wave Pulsars | 19 pages, 7 figures, RevTeX 4 | Phys.Rev. D72 (2005) 042004 | 10.1103/PhysRevD.72.042004 | AEI-2005-104 | gr-qc | null | We formulate and optimize a computational search strategy for detecting
gravitational waves from isolated, previously-unknown neutron stars (that is,
neutron stars with unknown sky positions, spin frequencies, and spin-down
parameters). It is well known that fully coherent searches over the relevant
parameter-space v... | [
{
"created": "Tue, 17 May 2005 14:15:47 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Cutler",
"Curt",
""
],
[
"Gholami",
"Iraj",
""
],
[
"Krishnan",
"Badri",
""
]
] | We formulate and optimize a computational search strategy for detecting gravitational waves from isolated, previously-unknown neutron stars (that is, neutron stars with unknown sky positions, spin frequencies, and spin-down parameters). It is well known that fully coherent searches over the relevant parameter-space vol... |
2006.06735 | Jorge Ovalle | J. Ovalle, R. Casadio, E. Contreras, A. Sotomayor | Hairy black holes by gravitational decoupling | 11 pages, 4 figures | null | 10.1016/j.dark.2020.100744 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes with hair represented by generic fields surrounding the central
source of the vacuum Schwarzschild metric are examined under the minimal set of
requirements consisting of i) the existence of a well defined event horizon and
ii) the strong or dominant energy condition for the hair outside the horizon.
We d... | [
{
"created": "Thu, 11 Jun 2020 18:50:35 GMT",
"version": "v1"
}
] | 2020-11-17 | [
[
"Ovalle",
"J.",
""
],
[
"Casadio",
"R.",
""
],
[
"Contreras",
"E.",
""
],
[
"Sotomayor",
"A.",
""
]
] | Black holes with hair represented by generic fields surrounding the central source of the vacuum Schwarzschild metric are examined under the minimal set of requirements consisting of i) the existence of a well defined event horizon and ii) the strong or dominant energy condition for the hair outside the horizon. We dev... |
2105.13860 | Rodrigo Tenorio | Rodrigo Tenorio, David Keitel, Alicia M. Sintes | Application of a hierarchical MCMC follow-up to Advanced LIGO continuous
gravitational-wave candidates | 23 pages, 15 figures, matches PRD published version | Phys. Rev. D 104, 084012 (2021) | 10.1103/PhysRevD.104.084012 | LIGO-P2100187 | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the first application of a hierarchical Markov Chain Monte Carlo
(MCMC) follow-up on continuous gravitational-wave candidates from real-data
searches. The follow-up uses an MCMC sampler to draw parameter-space points
from the posterior distribution, constructed using the matched-filter as a
log-likelihood.... | [
{
"created": "Fri, 28 May 2021 14:12:57 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Sep 2021 09:11:35 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Oct 2021 15:53:06 GMT",
"version": "v3"
}
] | 2021-10-04 | [
[
"Tenorio",
"Rodrigo",
""
],
[
"Keitel",
"David",
""
],
[
"Sintes",
"Alicia M.",
""
]
] | We present the first application of a hierarchical Markov Chain Monte Carlo (MCMC) follow-up on continuous gravitational-wave candidates from real-data searches. The follow-up uses an MCMC sampler to draw parameter-space points from the posterior distribution, constructed using the matched-filter as a log-likelihood. A... |
1611.01770 | Michael Edmund Tobar | Cheng-Gang Shao, Ya-Fen Chen, Yu-Jie Tan, Jun Luo, Shan-Qing Yang,
Michael Edmund Tobar | Enhanced sensitivity to Lorentz invariance violations in short-range
gravity experiments | Accepted Phys. Rev. D | null | 10.1103/PhysRevD.94.104061 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, first limits on putative Lorentz invariance violation coefficients
in the pure gravity sector were determined by the reanalysis of short-range
gravity experiments. Such experiments search for new physics at sidereal
frequencies. They are not, however, designed to optimize the signal strength of
a Lorentz in... | [
{
"created": "Sun, 6 Nov 2016 12:55:52 GMT",
"version": "v1"
}
] | 2016-12-21 | [
[
"Shao",
"Cheng-Gang",
""
],
[
"Chen",
"Ya-Fen",
""
],
[
"Tan",
"Yu-Jie",
""
],
[
"Luo",
"Jun",
""
],
[
"Yang",
"Shan-Qing",
""
],
[
"Tobar",
"Michael Edmund",
""
]
] | Recently, first limits on putative Lorentz invariance violation coefficients in the pure gravity sector were determined by the reanalysis of short-range gravity experiments. Such experiments search for new physics at sidereal frequencies. They are not, however, designed to optimize the signal strength of a Lorentz inva... |
1207.2655 | Stefan Liebscher | Stefan Liebscher, Alan D. Rendall, Sophonie Blaise Tchapnda | Oscillatory singularities in Bianchi models with magnetic fields | null | null | 10.1007/s00023-012-0207-7 | null | gr-qc math.DS | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An idea which has been around in general relativity for more than forty years
is that in the approach to a big bang singularity solutions of the Einstein
equations can be approximated by the Kasner map, which describes a succession
of Kasner epochs. This is already a highly non-trivial statement in the
spatially homo... | [
{
"created": "Wed, 11 Jul 2012 14:31:12 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Liebscher",
"Stefan",
""
],
[
"Rendall",
"Alan D.",
""
],
[
"Tchapnda",
"Sophonie Blaise",
""
]
] | An idea which has been around in general relativity for more than forty years is that in the approach to a big bang singularity solutions of the Einstein equations can be approximated by the Kasner map, which describes a succession of Kasner epochs. This is already a highly non-trivial statement in the spatially homoge... |
2312.07801 | Valeri Frolov P | Valeri Frolov | Motion of a rotating black hole in a homogeneous scalar field | 12 pages 4 figures | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In the present paper, we consider a rotating black hole moving in a
homogeneous massless scalar field. We assume that the field is weak and neglect
its backreaction, so that the metric at far distance from the black hole is
practically flat. In this domain one can introduce two reference frames, $K$
and $\tilde{K}$. ... | [
{
"created": "Tue, 12 Dec 2023 23:40:45 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Dec 2023 01:52:42 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Jan 2024 00:35:37 GMT",
"version": "v3"
}
] | 2024-01-05 | [
[
"Frolov",
"Valeri",
""
]
] | In the present paper, we consider a rotating black hole moving in a homogeneous massless scalar field. We assume that the field is weak and neglect its backreaction, so that the metric at far distance from the black hole is practically flat. In this domain one can introduce two reference frames, $K$ and $\tilde{K}$. Th... |
1906.01501 | Martin Bojowald | Martin Bojowald | Effective Field Theory of Loop Quantum Cosmology | 21 pages, invited contribution to special issue "Loop Quantum Gravity
and Non-Perturbative Approaches to Quantum Cosmology" | Universe 5 (2019) 44 | 10.3390/universe5020044 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum cosmology is traditionally formulated in a minisuperspace setting,
implicitly averaging fields over space to obtain homogeneous models. For
universal reasons related to the uncertainty principle, quantum corrections
then depend on the size of the averaging volume. In minisuperspace truncations,
the value of t... | [
{
"created": "Tue, 4 Jun 2019 15:11:05 GMT",
"version": "v1"
}
] | 2019-06-05 | [
[
"Bojowald",
"Martin",
""
]
] | Quantum cosmology is traditionally formulated in a minisuperspace setting, implicitly averaging fields over space to obtain homogeneous models. For universal reasons related to the uncertainty principle, quantum corrections then depend on the size of the averaging volume. In minisuperspace truncations, the value of thi... |
1605.00552 | Yaghoub Heydarzade | H. Hadi, Y. Heydarzade, M. Hashemi and F. Darabi | Emergent Cosmos in Einstein-Cartan Theory | 12 Pages, Accepted for Publication in Eur. Phys. J. C | Eur. Phys. J. C (2018) 78: 38 | 10.1140/epjc/s10052-017-5494-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the Padmanabhan's proposal, the accelerated expansion of the
universe can be driven by the difference between the surface and bulk degrees
of freedom in a region of space, described by the relation
$dV/dt=N_{sur}-N_{bulk}$ where $N_{sur}$ and $N_{bulk}=-N_{em}+N_{de}$ are the
degrees of freedom assigned to t... | [
{
"created": "Mon, 2 May 2016 16:34:08 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Jan 2018 13:41:47 GMT",
"version": "v2"
}
] | 2018-01-25 | [
[
"Hadi",
"H.",
""
],
[
"Heydarzade",
"Y.",
""
],
[
"Hashemi",
"M.",
""
],
[
"Darabi",
"F.",
""
]
] | Based on the Padmanabhan's proposal, the accelerated expansion of the universe can be driven by the difference between the surface and bulk degrees of freedom in a region of space, described by the relation $dV/dt=N_{sur}-N_{bulk}$ where $N_{sur}$ and $N_{bulk}=-N_{em}+N_{de}$ are the degrees of freedom assigned to the... |
2101.12659 | Sachin Pandey | Sachin Pandey | Aspects of Quantum Cosmology | Thesis submitted to IISER Kolkata for the Degree of Doctor of
Philosophy in Science, December 2020 | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this thesis, we try to resolve the alleged problem of non-unitarity for
various anisotropic cosmological models. Using Wheeler-DeWitt formulation, we
quantized the anisotropic models with variable spatial curvature, namely
Bianchi II and Bianchi VI. We showed that Hamiltonian of respective models
admits self-adjoi... | [
{
"created": "Fri, 29 Jan 2021 15:54:25 GMT",
"version": "v1"
}
] | 2021-02-01 | [
[
"Pandey",
"Sachin",
""
]
] | In this thesis, we try to resolve the alleged problem of non-unitarity for various anisotropic cosmological models. Using Wheeler-DeWitt formulation, we quantized the anisotropic models with variable spatial curvature, namely Bianchi II and Bianchi VI. We showed that Hamiltonian of respective models admits self-adjoint... |
2307.13302 | Nils A. Nilsson | Nils A. Nilsson and Christophe Le-Poncin Lafitte | Spacetime-symmetry breaking effects in gravitational-wave generation at
the first post-Newtonian order | 14 pages, 3 figures, accepted for publication in Physical Review D | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Current searches for signals of departures from the fundamental symmetries of
General Relativity using gravitational waves are largely dominated by
propagation effects like dispersion and birefringence from highly dynamic
sources such as coalescing binary-black holes and neutron stars. In this paper
we take steps tow... | [
{
"created": "Tue, 25 Jul 2023 07:34:20 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Dec 2023 10:40:21 GMT",
"version": "v2"
}
] | 2023-12-08 | [
[
"Nilsson",
"Nils A.",
""
],
[
"Lafitte",
"Christophe Le-Poncin",
""
]
] | Current searches for signals of departures from the fundamental symmetries of General Relativity using gravitational waves are largely dominated by propagation effects like dispersion and birefringence from highly dynamic sources such as coalescing binary-black holes and neutron stars. In this paper we take steps towar... |
1604.07222 | Tommaso De Lorenzo | Marios Christodoulou and Tommaso De Lorenzo | On the volume inside old black holes | 9 pages, 5 figures | Phys. Rev. D 94, 104002 (2016) | 10.1103/PhysRevD.94.104002 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes that have nearly evaporated are often thought of as small
objects, due to their tiny exterior area. However, the horizon bounds large
spacelike hypersurfaces. A compelling geometric perspective on the evolution of
the interior geometry was recently shown to be provided by a generally
covariant definition ... | [
{
"created": "Mon, 25 Apr 2016 12:05:59 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Nov 2016 12:56:38 GMT",
"version": "v2"
}
] | 2016-11-04 | [
[
"Christodoulou",
"Marios",
""
],
[
"De Lorenzo",
"Tommaso",
""
]
] | Black holes that have nearly evaporated are often thought of as small objects, due to their tiny exterior area. However, the horizon bounds large spacelike hypersurfaces. A compelling geometric perspective on the evolution of the interior geometry was recently shown to be provided by a generally covariant definition of... |
2009.13886 | Xiangdong Zhang | Xianglong Wu and Xiangdong Zhang | Collisional Penrose process of BTZ black holes | 16 pages,3 figures | Phys. Rev. D 103, 044048 (2021) | 10.1103/PhysRevD.103.044048 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Penrose process in the vicinity of an extremal
Ban\~ados-Teitelboim-Zanelli(BTZ) black hole is studied. Due to the existence
of negative cosmological constant, only massless particles could escape to
infinity. Hence we analyse the Penrose process by one massless particle
collides with another massive particle nea... | [
{
"created": "Tue, 29 Sep 2020 09:25:11 GMT",
"version": "v1"
}
] | 2021-03-03 | [
[
"Wu",
"Xianglong",
""
],
[
"Zhang",
"Xiangdong",
""
]
] | The Penrose process in the vicinity of an extremal Ban\~ados-Teitelboim-Zanelli(BTZ) black hole is studied. Due to the existence of negative cosmological constant, only massless particles could escape to infinity. Hence we analyse the Penrose process by one massless particle collides with another massive particle near ... |
0904.4311 | Masashi Kimura | Masashi Kimura | Dynamical Black Rings with a Positive Cosmological Constant | 11 pages, 16 figures, references added | Phys.Rev.D80:044012,2009 | 10.1103/PhysRevD.80.044012 | OCU-PHYS 312, AP-GR 66 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct dynamical black ring solutions in the five dimensional
Einstein-Maxwell system with a positive cosmological constant and investigate
the geometrical structure. The solutions describe the physical process such
that a thin black ring at early time shrinks and changes into a single black
hole as time increa... | [
{
"created": "Tue, 28 Apr 2009 06:00:51 GMT",
"version": "v1"
},
{
"created": "Sat, 2 May 2009 09:27:06 GMT",
"version": "v2"
}
] | 2009-11-19 | [
[
"Kimura",
"Masashi",
""
]
] | We construct dynamical black ring solutions in the five dimensional Einstein-Maxwell system with a positive cosmological constant and investigate the geometrical structure. The solutions describe the physical process such that a thin black ring at early time shrinks and changes into a single black hole as time increase... |
2309.01080 | Manabendra Sharma | Manabendra Sharma, Gustavo S. Vicente, Leila L. Graef, Rudnei O. Ramos
and Anzhong Wang | Quantum geometric formulation of Brans-Dicke theory for Bianchi I
spacetime | 13 pages, 4 figures | null | null | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We consider a formulation of the Brans-Dicke theory in Jordan's frame for
Bianchi-I spacetime within the framework of loop quantum gravity. The
robustness of singularity resolutions due to the quantum effects is explicitly
verified in the context of two quantization schemes typically used in the
literature. We presen... | [
{
"created": "Sun, 3 Sep 2023 05:16:42 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Aug 2024 14:34:07 GMT",
"version": "v2"
}
] | 2024-08-06 | [
[
"Sharma",
"Manabendra",
""
],
[
"Vicente",
"Gustavo S.",
""
],
[
"Graef",
"Leila L.",
""
],
[
"Ramos",
"Rudnei O.",
""
],
[
"Wang",
"Anzhong",
""
]
] | We consider a formulation of the Brans-Dicke theory in Jordan's frame for Bianchi-I spacetime within the framework of loop quantum gravity. The robustness of singularity resolutions due to the quantum effects is explicitly verified in the context of two quantization schemes typically used in the literature. We present ... |
1410.4758 | Hui-Ling Li | Hui-Ling Li, Zhong-Wen Feng, Xiao-Tao Zu | Quantum tunneling from high dimensional G\"odel black hole | 12 pages, no figures | Gen Relativ Gravit (2016) 48:18 | 10.1007/s10714-015-2015-0 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | Considering quantum gravity effect, we investigate the quantum tunneling from
high dimensional Kerr-G\"odel black hole using generalized Dirac equation. As a
result, revised tunneling probability is obtained, and the corrected Hawking
temperature is also presented.
| [
{
"created": "Fri, 17 Oct 2014 15:27:20 GMT",
"version": "v1"
}
] | 2017-06-20 | [
[
"Li",
"Hui-Ling",
""
],
[
"Feng",
"Zhong-Wen",
""
],
[
"Zu",
"Xiao-Tao",
""
]
] | Considering quantum gravity effect, we investigate the quantum tunneling from high dimensional Kerr-G\"odel black hole using generalized Dirac equation. As a result, revised tunneling probability is obtained, and the corrected Hawking temperature is also presented. |
1511.03857 | Sergey Rubin | Sergey G. Rubin | The problem of small physical parameters and its possible solution | 20 pages, 2 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mechanism of continuous set of different universes formation is
elaborated. It provides tool to solve the problem of observed smallness of
physical parameters. Solution of two puzzles - the hierarchy and the
cosmological constant problems based on multidimensional gravity is discussed.
| [
{
"created": "Thu, 12 Nov 2015 11:16:16 GMT",
"version": "v1"
}
] | 2015-11-13 | [
[
"Rubin",
"Sergey G.",
""
]
] | The mechanism of continuous set of different universes formation is elaborated. It provides tool to solve the problem of observed smallness of physical parameters. Solution of two puzzles - the hierarchy and the cosmological constant problems based on multidimensional gravity is discussed. |
gr-qc/9511003 | Viqar Husain | Viqar Husain | Black hole solutions in 2+1 dimensions | 8 pages, RevTeX (to appear in Phys. Rev. D) References to Mann and
Ross, and Mann, Chan and Chan added | Phys.Rev. D52 (1995) 6860-6862 | 10.1103/PhysRevD.52.6860 | CGPG-95/10-8 | gr-qc hep-th | null | We give circularly symmetric solutions for null fluid collapse in
2+1-dimensional Einstein gravity with a cosmological constant. The fluid
pressure $P$ and energy density $\rho$ are related by $P=k\rho$ $(k\le 1)$. The
long time limit of the solutions are black holes whose horizon structures
depend on the value of $k... | [
{
"created": "Wed, 1 Nov 1995 21:15:59 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Nov 1995 20:50:28 GMT",
"version": "v2"
}
] | 2009-10-28 | [
[
"Husain",
"Viqar",
""
]
] | We give circularly symmetric solutions for null fluid collapse in 2+1-dimensional Einstein gravity with a cosmological constant. The fluid pressure $P$ and energy density $\rho$ are related by $P=k\rho$ $(k\le 1)$. The long time limit of the solutions are black holes whose horizon structures depend on the value of $k$.... |
1303.4707 | Plyatsko Roman | Roman Plyatsko and Mykola Fenyk | Highly relativistic circular orbits of spinning particle in the Kerr
field | 10 pages, 16 figures | Phys. Rev. D, v.87, 044019 (2013) | 10.1103/PhysRevD.87.044019 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Mathisson-Papapetrou equations in Kerr's background are considered. The
region of existence of highly relativistic planar circular orbits of a spinning
particle in this background and dependence of the particle's Lorentz
$\gamma$-factor on its spin and radial coordinate are investigated. It is shown
that in contr... | [
{
"created": "Tue, 19 Mar 2013 19:25:41 GMT",
"version": "v1"
}
] | 2015-06-15 | [
[
"Plyatsko",
"Roman",
""
],
[
"Fenyk",
"Mykola",
""
]
] | The Mathisson-Papapetrou equations in Kerr's background are considered. The region of existence of highly relativistic planar circular orbits of a spinning particle in this background and dependence of the particle's Lorentz $\gamma$-factor on its spin and radial coordinate are investigated. It is shown that in contras... |
1702.02552 | Tomonori Totani | Tomonori Totani (Univ. Tokyo) | Gravity with free initial conditions: a solution to the cosmological
constant problem testable by CMB B-mode polarization | 10 pages, no figure. Accepted by Phys. Rev. D | Phys. Rev. D 96, 084062 (2017) | 10.1103/PhysRevD.96.084062 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In standard general relativity the universe cannot be started with arbitrary
initial conditions, because four of the ten components of the Einstein's field
equations (EFE) are constraints on initial conditions. In the previous work it
was proposed to extend the gravity theory to allow free initial conditions,
with a ... | [
{
"created": "Wed, 8 Feb 2017 18:20:42 GMT",
"version": "v1"
},
{
"created": "Fri, 13 Oct 2017 08:42:29 GMT",
"version": "v2"
}
] | 2017-11-08 | [
[
"Totani",
"Tomonori",
"",
"Univ. Tokyo"
]
] | In standard general relativity the universe cannot be started with arbitrary initial conditions, because four of the ten components of the Einstein's field equations (EFE) are constraints on initial conditions. In the previous work it was proposed to extend the gravity theory to allow free initial conditions, with a mo... |
2101.11567 | Orlando Luongo | Alessio Belfiglio, Orlando Luongo, Stefano Mancini | Entanglement production in Einstein-Cartan theory | 10 pages, 4 figures | Phys. Rev. D 104, 043523 (2021) | 10.1103/PhysRevD.104.043523 | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the entanglement production for Dirac and Klein-Gordon fields in an
expanding spacetime characterized by the presence of torsion. Torsion is here
considered according to the Einstein-Cartan theory with a conformally flat
Friedmann-Robertson-Walker spacetime. In this framework, torsion is seen as an
external ... | [
{
"created": "Wed, 27 Jan 2021 17:48:05 GMT",
"version": "v1"
}
] | 2021-08-25 | [
[
"Belfiglio",
"Alessio",
""
],
[
"Luongo",
"Orlando",
""
],
[
"Mancini",
"Stefano",
""
]
] | We study the entanglement production for Dirac and Klein-Gordon fields in an expanding spacetime characterized by the presence of torsion. Torsion is here considered according to the Einstein-Cartan theory with a conformally flat Friedmann-Robertson-Walker spacetime. In this framework, torsion is seen as an external fi... |
gr-qc/0010007 | Carlos Lousto | Carlos O. Lousto (AEI-Golm) | Towards the solution of the relativistic gravitational radiation
reaction problem for binary black holes | Contribution to the Proceedings of the 3rd LISA Symposium | Class.Quant.Grav. 18 (2001) 3989-3994 | 10.1088/0264-9381/18/19/304 | AEI-2000-061 | gr-qc | null | Here we present the results of applying the generalized Riemann zeta-function
regularization method to the gravitational radiation reaction problem. We
analyze in detail the headon collision of two nonspinning black holes with
extreme mass ratio. The resulting reaction force on the smaller hole is
repulsive. We discu... | [
{
"created": "Tue, 3 Oct 2000 13:16:06 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Jul 2001 15:31:15 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Lousto",
"Carlos O.",
"",
"AEI-Golm"
]
] | Here we present the results of applying the generalized Riemann zeta-function regularization method to the gravitational radiation reaction problem. We analyze in detail the headon collision of two nonspinning black holes with extreme mass ratio. The resulting reaction force on the smaller hole is repulsive. We discuss... |
2406.19147 | Sjors Heefer | Sjors Heefer, Lorens F. Niehof, Andrea Fuster | A new class of non-Einstein pp-wave solutions to quadratic gravity | null | null | null | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We obtain a new family of exact vacuum solutions to quadratic gravity that
describe pp-waves with two-dimensional wave surfaces that can have any
prescribed constant curvature. When the wave surfaces are flat we recover the
Peres waves obtained by Madsen, a subset of which forms precisely the vacuum
pp-waves of gener... | [
{
"created": "Thu, 27 Jun 2024 13:06:08 GMT",
"version": "v1"
}
] | 2024-06-28 | [
[
"Heefer",
"Sjors",
""
],
[
"Niehof",
"Lorens F.",
""
],
[
"Fuster",
"Andrea",
""
]
] | We obtain a new family of exact vacuum solutions to quadratic gravity that describe pp-waves with two-dimensional wave surfaces that can have any prescribed constant curvature. When the wave surfaces are flat we recover the Peres waves obtained by Madsen, a subset of which forms precisely the vacuum pp-waves of general... |
1710.01910 | Kourosh Nozari | F. Rajabi and K. Nozari | Unimodular $f(R,T)$ Gravity | 24 pages, 3 figures, to appear in PRD | Phys. Rev. D 96, 084061 (2017) | 10.1103/PhysRevD.96.084061 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend the idea of unimodular gravity to the modified $f(R,T)$ theories. A
new class of cosmological solutions, that the unimodular constraint on the
metric imposes on the $f(R,T)$ theories, are studied. This extension is done in
both Jordan and Einstein frames. We show that while the Lagrange multiplier
(that imp... | [
{
"created": "Thu, 5 Oct 2017 08:23:46 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Oct 2017 09:19:56 GMT",
"version": "v2"
}
] | 2017-11-22 | [
[
"Rajabi",
"F.",
""
],
[
"Nozari",
"K.",
""
]
] | We extend the idea of unimodular gravity to the modified $f(R,T)$ theories. A new class of cosmological solutions, that the unimodular constraint on the metric imposes on the $f(R,T)$ theories, are studied. This extension is done in both Jordan and Einstein frames. We show that while the Lagrange multiplier (that impos... |
1909.01254 | Andrew Coates | Andrew Coates, Sebastian H. V\"olkel, Kostas D. Kokkotas | Spectral Lines of Quantized, Spinning Black Holes and their
Astrophysical Relevance | 5 pages, 1 figure, minor changes for clarity and some additional
references | Phys. Rev. Lett. 123, 171104, 2019 | 10.1103/PhysRevLett.123.171104 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this Letter, we study black hole area quantization in the context of
gravitational wave physics. It was recently argued that black hole area
quantization could be a mechanism to produce so-called echoes as well as
characteristic absorption lines in gravitational wave observations of merging
black holes. One can ma... | [
{
"created": "Tue, 3 Sep 2019 15:31:27 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Oct 2019 14:47:17 GMT",
"version": "v2"
}
] | 2019-10-29 | [
[
"Coates",
"Andrew",
""
],
[
"Völkel",
"Sebastian H.",
""
],
[
"Kokkotas",
"Kostas D.",
""
]
] | In this Letter, we study black hole area quantization in the context of gravitational wave physics. It was recently argued that black hole area quantization could be a mechanism to produce so-called echoes as well as characteristic absorption lines in gravitational wave observations of merging black holes. One can matc... |
1005.1107 | Marek Nowakowski | I. Arraut, D. Batic, M. Nowakowski | Velocity and velocity bounds in static spherically symmetric metrics | 20 pages, 5 figures | Central Eur.J.Phys.9:926-938,2011 | 10.2478/s11534-010-0147-0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We find simple expressions for velocity of massless particles in dependence
of the distance $r$ in Schwarzschild coordinates. For massive particles these
expressions put an upper bound for the velocity. Our results apply to static
spherically symmetric metrics. We use these results to calculate the velocity
for diffe... | [
{
"created": "Thu, 6 May 2010 23:28:16 GMT",
"version": "v1"
}
] | 2011-05-19 | [
[
"Arraut",
"I.",
""
],
[
"Batic",
"D.",
""
],
[
"Nowakowski",
"M.",
""
]
] | We find simple expressions for velocity of massless particles in dependence of the distance $r$ in Schwarzschild coordinates. For massive particles these expressions put an upper bound for the velocity. Our results apply to static spherically symmetric metrics. We use these results to calculate the velocity for differe... |
2111.03166 | Carlo Rovelli | Jonathan Engle, Carlo Rovelli | The accidental flatness constraint does not mean a wrong classical limit | 6 pages | null | 10.1088/1361-6382/ac655e | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We shed some light on the reason why the accidental flatness constraint
appears in certain limits of the amplitudes of covariant loop quantum gravity.
We show why this constraint is harmless, by displaying how analogous accidental
constraints appear in transition amplitudes of simple systems, when certain
limits are ... | [
{
"created": "Thu, 4 Nov 2021 21:23:13 GMT",
"version": "v1"
}
] | 2022-05-25 | [
[
"Engle",
"Jonathan",
""
],
[
"Rovelli",
"Carlo",
""
]
] | We shed some light on the reason why the accidental flatness constraint appears in certain limits of the amplitudes of covariant loop quantum gravity. We show why this constraint is harmless, by displaying how analogous accidental constraints appear in transition amplitudes of simple systems, when certain limits are co... |
0806.1370 | Olivier Sarbach | J.A. Gonzalez, F.S. Guzman, O. Sarbach | Instability of wormholes supported by a ghost scalar field. II.
Nonlinear evolution | 16 pages, 15 figures, minor modifications, to appear in Classical and
Quantum Gravity | Class.Quant.Grav.26:015011,2009 | 10.1088/0264-9381/26/1/015011 | UMSNH-IFM-F-2008-19 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the nonlinear evolution of spherically symmetric wormhole
solutions coupled to a massless ghost scalar field using numerical methods. In
a previous article we have shown that static wormholes with these properties
are unstable with respect to linear perturbations. Here we show that depending
on the initial... | [
{
"created": "Mon, 9 Jun 2008 04:58:55 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Nov 2008 05:24:27 GMT",
"version": "v2"
}
] | 2008-12-25 | [
[
"Gonzalez",
"J. A.",
""
],
[
"Guzman",
"F. S.",
""
],
[
"Sarbach",
"O.",
""
]
] | We analyze the nonlinear evolution of spherically symmetric wormhole solutions coupled to a massless ghost scalar field using numerical methods. In a previous article we have shown that static wormholes with these properties are unstable with respect to linear perturbations. Here we show that depending on the initial p... |
gr-qc/9806076 | Renato Klippert | V.A. De Lorenci, R. Klippert (EFEI/Itajuba), M. Novello, J.M. Salim
(CBPF) | Nonlinear electrodynamics and FRW cosmology | 5 pages, 3 eps figures, REVTeX 3 with epsf and multicol sty files,
new solutions, improved version with emphasis in math content Journal-refby:
Phys. Rev. D 65, 063501 (2002) | null | null | null | gr-qc | null | Maxwell electrodynamics, considered as a source of the classical Einstein
field equations, leads to the singular isotropic Friedmann solutions. We show
that this singular behavior does not occur for a class of nonlinear
generalizations of the electromagnetic theory. A mathematical toy model is
proposed for which the ... | [
{
"created": "Thu, 18 Jun 1998 20:16:36 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2002 16:37:14 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"De Lorenci",
"V. A.",
"",
"EFEI/Itajuba"
],
[
"Klippert",
"R.",
"",
"EFEI/Itajuba"
],
[
"Novello",
"M.",
"",
"CBPF"
],
[
"Salim",
"J. M.",
"",
"CBPF"
]
] | Maxwell electrodynamics, considered as a source of the classical Einstein field equations, leads to the singular isotropic Friedmann solutions. We show that this singular behavior does not occur for a class of nonlinear generalizations of the electromagnetic theory. A mathematical toy model is proposed for which the an... |
gr-qc/0205115 | Livia Conti | L. Conti, M. De Rosa, F. Marin, L. Taffarello and M. Cerdonio | Room temperature GW bar detector with opto-mechanical readout | 7 figures, submitted to Phys. Rev. D | null | 10.1063/1.1544077 | null | gr-qc | null | We present the full implementation of a room-temperature gravitational wave
bar detector equipped with an opto-mechanical readout. The mechanical
vibrations are read by a Fabry--Perot interferometer whose length changes are
compared with a stable reference optical cavity by means of a resonant laser.
The detector per... | [
{
"created": "Tue, 28 May 2002 13:20:32 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Conti",
"L.",
""
],
[
"De Rosa",
"M.",
""
],
[
"Marin",
"F.",
""
],
[
"Taffarello",
"L.",
""
],
[
"Cerdonio",
"M.",
""
]
] | We present the full implementation of a room-temperature gravitational wave bar detector equipped with an opto-mechanical readout. The mechanical vibrations are read by a Fabry--Perot interferometer whose length changes are compared with a stable reference optical cavity by means of a resonant laser. The detector perfo... |
gr-qc/9309013 | Jesus Ibanez Medrano | J.M. Aguirregabiria, A. Feinstein and J. Ibanez | Exponential-Potential Scalar Field Universes I: The Bianchi I Models | 16 pages, Plain LaTeX, 1 Figure to be sent on request, to appear in
Phys. Rev. D | Phys.Rev.D48:4662-4668,1993 | 10.1103/PhysRevD.48.4662 | null | gr-qc | null | We obtain a general exact solution of the Einstein field equations for the
anisotropic Bianchi type I universes filled with an exponential-potential
scalar field and study their dynamics. It is shown, in agreement with previous
studies, that for a wide range of initial conditions the late-time behaviour of
the models... | [
{
"created": "Tue, 14 Sep 1993 15:17:44 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Aguirregabiria",
"J. M.",
""
],
[
"Feinstein",
"A.",
""
],
[
"Ibanez",
"J.",
""
]
] | We obtain a general exact solution of the Einstein field equations for the anisotropic Bianchi type I universes filled with an exponential-potential scalar field and study their dynamics. It is shown, in agreement with previous studies, that for a wide range of initial conditions the late-time behaviour of the models i... |
2105.05581 | Masashi Kimura | Masashi Kimura, Tomohiro Harada, Atsushi Naruko and Kenji Toma | Backreaction of Mass and Angular Momentum Accretion on Black Holes:
General Formulation of the Metric Perturbations and Application to the
Blandford-Znajek Process | 35 pages, v2: minor revisions, v3: minor revisions, accepted for
publication in PTEP | PTEP 2021 (2021) 9, 093E03 | 10.1093/ptep/ptab101 | RUP-21-7, YITP-21-43 | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the metric backreaction of mass and angular momentum accretion on
black holes. We first develop the formalism of monopole and dipole linear
gravitational perturbations around the Schwarzschild black holes in the
Eddington-Finkelstein coordinates against the generic time-dependent matters.
We derive the relat... | [
{
"created": "Wed, 12 May 2021 11:01:25 GMT",
"version": "v1"
},
{
"created": "Fri, 28 May 2021 09:20:31 GMT",
"version": "v2"
},
{
"created": "Sat, 31 Jul 2021 12:12:45 GMT",
"version": "v3"
}
] | 2021-10-20 | [
[
"Kimura",
"Masashi",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Naruko",
"Atsushi",
""
],
[
"Toma",
"Kenji",
""
]
] | We study the metric backreaction of mass and angular momentum accretion on black holes. We first develop the formalism of monopole and dipole linear gravitational perturbations around the Schwarzschild black holes in the Eddington-Finkelstein coordinates against the generic time-dependent matters. We derive the relatio... |
1308.1642 | Vincenzo Vitagliano | Vincenzo Vitagliano | The role of nonmetricity in metric-affine theories of gravity | 15 pages. v2: some misconceptions clarified, references added.
Accepted for publication on Classical and Quantum Gravity | null | 10.1088/0264-9381/31/4/045006 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The intriguing choice to treat alternative theories of gravity by means of
the Palatini approach, namely elevating the affine connection to the role of
independent variable, contains the seed of some interesting (usually
under-explored) generalizations of General Relativity, the metric-affine
theories of gravity. The... | [
{
"created": "Wed, 7 Aug 2013 17:37:02 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Jan 2014 11:23:39 GMT",
"version": "v2"
}
] | 2015-06-16 | [
[
"Vitagliano",
"Vincenzo",
""
]
] | The intriguing choice to treat alternative theories of gravity by means of the Palatini approach, namely elevating the affine connection to the role of independent variable, contains the seed of some interesting (usually under-explored) generalizations of General Relativity, the metric-affine theories of gravity. The p... |
2304.04419 | Nikolaos Dimakis | N. Dimakis, M. Roumeliotis, A. Paliathanasis and T. Christodoulakis | Anisotropic Solutions in Symmetric Teleparallel $f\left(
Q\right)$-theory: Kantowski-Sachs and Bianchi III LRS Cosmologies | 42 pages, no figures, Latex2e source file, EPJC accepted version | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the existence of anisotropic self-similar exact solutions in
symmetric teleparallel $f\left( Q\right)$-theory. For the background geometry
we consider the Kantowski-Sachs and the Locally Rotationally Symmetric Bianchi
type III geometries. These two anisotropic spacetimes are of special interest
because... | [
{
"created": "Mon, 10 Apr 2023 07:00:32 GMT",
"version": "v1"
},
{
"created": "Sat, 26 Aug 2023 12:27:19 GMT",
"version": "v2"
}
] | 2023-08-29 | [
[
"Dimakis",
"N.",
""
],
[
"Roumeliotis",
"M.",
""
],
[
"Paliathanasis",
"A.",
""
],
[
"Christodoulakis",
"T.",
""
]
] | We investigate the existence of anisotropic self-similar exact solutions in symmetric teleparallel $f\left( Q\right)$-theory. For the background geometry we consider the Kantowski-Sachs and the Locally Rotationally Symmetric Bianchi type III geometries. These two anisotropic spacetimes are of special interest because i... |
0811.0282 | Dennis Lorek | Claus Laemmerzahl, Dennis Lorek, Hansjoerg Dittus | Confronting Finsler space-time with experiment | To be published in General Relativity and Gravitation | Gen.Rel.Grav.41:1345-1353,2009 | 10.1007/s10714-008-0710-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Within all approaches to quantum gravity small violations of the Einstein
Equivalence Principle are expected. This includes violations of Lorentz
invariance. While usually violations of Lorentz invariance are introduced
through the coupling to additional tensor fields, here a Finslerian approach is
employed where vio... | [
{
"created": "Mon, 3 Nov 2008 12:49:11 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Laemmerzahl",
"Claus",
""
],
[
"Lorek",
"Dennis",
""
],
[
"Dittus",
"Hansjoerg",
""
]
] | Within all approaches to quantum gravity small violations of the Einstein Equivalence Principle are expected. This includes violations of Lorentz invariance. While usually violations of Lorentz invariance are introduced through the coupling to additional tensor fields, here a Finslerian approach is employed where viola... |
gr-qc/9701059 | Shin'ji Mukouyama | Shinji Mukohyama, Masafumi Seriu and Hideo Kodama | Can the entanglement entropy be the origin of black-hole entropy ? | 40 pages, Latex file, one figure | Phys.Rev. D55 (1997) 7666-7679 | 10.1103/PhysRevD.55.7666 | YITP-96-36 | gr-qc | null | Entanglement entropy is often speculated as a strong candidate for the origin
of the black-hole entropy. To judge whether this speculation is true or not, it
is effective to investigate the whole structure of thermodynamics obtained from
the entanglement entropy, rather than just to examine the apparent structure of
... | [
{
"created": "Tue, 28 Jan 1997 10:25:32 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jan 1997 09:20:02 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Feb 1997 04:49:27 GMT",
"version": "v3"
},
{
"created": "Sat, 15 Mar 1997 01:21:50 GMT",
"version": "v4"
}
] | 2009-10-30 | [
[
"Mukohyama",
"Shinji",
""
],
[
"Seriu",
"Masafumi",
""
],
[
"Kodama",
"Hideo",
""
]
] | Entanglement entropy is often speculated as a strong candidate for the origin of the black-hole entropy. To judge whether this speculation is true or not, it is effective to investigate the whole structure of thermodynamics obtained from the entanglement entropy, rather than just to examine the apparent structure of th... |
1907.04178 | Barak Shoshany | Barak Shoshany | Lectures on Faster-than-Light Travel and Time Travel | 64 pages, 8 figures; updated figures; version published in SciPost
Physics Lecture Notes | SciPost Phys. Lect. Notes 10 (2019) | 10.21468/SciPostPhysLectNotes.10 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | These lecture notes were prepared for a 25-hour course for advanced
undergraduate students participating in Perimeter Institute's Undergraduate
Summer Program. The lectures cover some of what is currently known about the
possibility of superluminal travel and time travel within the context of
established science, tha... | [
{
"created": "Sat, 6 Jul 2019 02:08:20 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Sep 2019 23:12:27 GMT",
"version": "v2"
},
{
"created": "Tue, 1 Oct 2019 13:04:26 GMT",
"version": "v3"
}
] | 2019-10-02 | [
[
"Shoshany",
"Barak",
""
]
] | These lecture notes were prepared for a 25-hour course for advanced undergraduate students participating in Perimeter Institute's Undergraduate Summer Program. The lectures cover some of what is currently known about the possibility of superluminal travel and time travel within the context of established science, that ... |
2001.00460 | Rahul Kumar | Rahul Kumar, Sushant G. Ghosh, and Anzhong Wang | Gravitational deflection of light and shadow cast by rotating
Kalb-Ramond black holes | 18 pages, 12 figures, and 4 tables. Matched with the published
version | Phys.Rev.D 101, 104001 (2020) | 10.1103/PhysRevD.101.104001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nonminimal coupling of the nonzero vacuum expectation value of the
self-interacting antisymmetric Kalb-Ramond field with gravity leads to a
power-law hairy black hole having a parameter $s$, which encompasses the
Reissner$-$Nordstrom black hole ($s=1$). We obtain the axially symmetric
counterpart of this hairy so... | [
{
"created": "Thu, 2 Jan 2020 14:42:47 GMT",
"version": "v1"
},
{
"created": "Fri, 8 May 2020 08:45:47 GMT",
"version": "v2"
}
] | 2020-05-13 | [
[
"Kumar",
"Rahul",
""
],
[
"Ghosh",
"Sushant G.",
""
],
[
"Wang",
"Anzhong",
""
]
] | The nonminimal coupling of the nonzero vacuum expectation value of the self-interacting antisymmetric Kalb-Ramond field with gravity leads to a power-law hairy black hole having a parameter $s$, which encompasses the Reissner$-$Nordstrom black hole ($s=1$). We obtain the axially symmetric counterpart of this hairy solu... |
gr-qc/9905071 | Israel Quiroz | Israel Quiros (Dpto.Fisica. Universidad Central de Las Villas. Santa
Clara. Cuba.) | Dual geometries and spacetime singularities | 11 pages, LaTeX, no figures, version accepted for publication in PRD | Phys.Rev. D61 (2000) 124026 | 10.1103/PhysRevD.61.124026 | null | gr-qc | null | The notion of geometrical duality is discussed in the context of both
Brans-Dicke theory and general relativity. It is shown that, in some particular
solutions, the spacetime singularities that arise in usual Riemannian general
relativity may be avoided in its dual representation (Weyl-type general
relativity). This ... | [
{
"created": "Wed, 19 May 1999 23:00:10 GMT",
"version": "v1"
},
{
"created": "Mon, 31 May 1999 16:56:32 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Nov 1999 20:03:00 GMT",
"version": "v3"
},
{
"created": "Mon, 21 Feb 2000 12:57:05 GMT",
"version": "v4"
}
] | 2009-10-31 | [
[
"Quiros",
"Israel",
"",
"Dpto.Fisica. Universidad Central de Las Villas. Santa\n Clara. Cuba."
]
] | The notion of geometrical duality is discussed in the context of both Brans-Dicke theory and general relativity. It is shown that, in some particular solutions, the spacetime singularities that arise in usual Riemannian general relativity may be avoided in its dual representation (Weyl-type general relativity). This du... |
gr-qc/0111009 | L. C. Garcia de Andrade | C.Sivaram and L.C.Garcia de Andrade | Torsion Gravity Effects on Charged-Particles and Neutron Interferometers | Latex file | null | null | null | gr-qc | null | Torsion gravitational effects in the quantum interference of charged
particles are investigated. The influence of axial torsion in the
Schiff-Banhill effect (SB) inside a metallic shell is given. The effect of
torsion on the surface of the earth on (SB) experiment is estimated. Torsion
gravity effects on the Sagnac p... | [
{
"created": "Sun, 4 Nov 2001 19:42:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sivaram",
"C.",
""
],
[
"de Andrade",
"L. C. Garcia",
""
]
] | Torsion gravitational effects in the quantum interference of charged particles are investigated. The influence of axial torsion in the Schiff-Banhill effect (SB) inside a metallic shell is given. The effect of torsion on the surface of the earth on (SB) experiment is estimated. Torsion gravity effects on the Sagnac pha... |
1308.3907 | Yun Soo Myung | Yun Soo Myung | Unstable Schwarzschild-Tangherlini black holes in fourth-order gravity | 10 pages. version to appear in PRD | Phys. Rev. D 88, 084006 (2013) | 10.1103/PhysRevD.88.084006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the stability of Schwarzschild-Tangherlini (ST) black holes in
fourth-order gravity which provides a higher dimensional linearized massive
equation. The linearized-Ricci tensor perturbation is employed to exhibit
unstable modes featuring the Gregory-Laflamme (GL) instability of higher
dimensional black strin... | [
{
"created": "Mon, 19 Aug 2013 01:16:09 GMT",
"version": "v1"
},
{
"created": "Wed, 25 Sep 2013 22:37:13 GMT",
"version": "v2"
}
] | 2013-10-30 | [
[
"Myung",
"Yun Soo",
""
]
] | We study the stability of Schwarzschild-Tangherlini (ST) black holes in fourth-order gravity which provides a higher dimensional linearized massive equation. The linearized-Ricci tensor perturbation is employed to exhibit unstable modes featuring the Gregory-Laflamme (GL) instability of higher dimensional black strings... |
1810.09766 | Abbas Sherif | Abbas Sherif and Gareth Amery | Relating a Geroch-like boundary and the abstract boundary constructions
for spacetimes | Minor changes to the last version. 23 pages and 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a Geroch-like boundary (when restricted to geodesic curves, this
boundary contains as a subset the Geroch's $g$ boundary), which we denote by
$\tilde{g}$, and establish an explicit embedding of the $\tilde{g}$ boundary
into the $a$ boundary of Scott and Szekeres. This construction, and
subsequently the e... | [
{
"created": "Tue, 23 Oct 2018 10:52:17 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Mar 2019 09:55:27 GMT",
"version": "v2"
},
{
"created": "Sat, 17 Oct 2020 14:30:56 GMT",
"version": "v3"
},
{
"created": "Sat, 7 Nov 2020 11:34:20 GMT",
"version": "v4"
}
] | 2020-11-10 | [
[
"Sherif",
"Abbas",
""
],
[
"Amery",
"Gareth",
""
]
] | We construct a Geroch-like boundary (when restricted to geodesic curves, this boundary contains as a subset the Geroch's $g$ boundary), which we denote by $\tilde{g}$, and establish an explicit embedding of the $\tilde{g}$ boundary into the $a$ boundary of Scott and Szekeres. This construction, and subsequently the exp... |
1312.1821 | Sven Zschocke | S. Zschocke, S.A. Klioner, M.H. Soffel | Towards sub-microarcsecond models for relativistic astrometry | Proceeding to the Conference Les Journees: "Scientific developments
from highly accurate space-time reference systems", 16-18 September 2013,
Observatoire de Paris, France | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Astrometric space missions like Gaia have stimulated a rapid advance in the
field of relativistic astrometry. Present investigations in that field aim at
accuracies significantly less than a microarcsecond. We review the present
status of relativistic astrometry. As far as the problem of light propagation
is concerne... | [
{
"created": "Fri, 6 Dec 2013 10:09:58 GMT",
"version": "v1"
}
] | 2013-12-09 | [
[
"Zschocke",
"S.",
""
],
[
"Klioner",
"S. A.",
""
],
[
"Soffel",
"M. H.",
""
]
] | Astrometric space missions like Gaia have stimulated a rapid advance in the field of relativistic astrometry. Present investigations in that field aim at accuracies significantly less than a microarcsecond. We review the present status of relativistic astrometry. As far as the problem of light propagation is concerned ... |
2203.16704 | Pablo Le\'on | C. Las Heras and P. Leon | Complexity factor of spherically anisotropic polytropes from
gravitational decoupling | version that matches the published | General Relativity and Gravitation volume 54, Article number: 138
(2022) | 10.1007/s10714-022-03031-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we will analyse the complexity factor, proposed by L. Herrera,
for spherically symmetric static matter distributions satisfying a polytropic
equation through the gravitational decoupling method. Specifically, we will use
the 2-step GD, which is a particular case of the extended geometric deformation
(EGD... | [
{
"created": "Wed, 30 Mar 2022 23:02:39 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Nov 2022 13:58:19 GMT",
"version": "v2"
}
] | 2022-11-04 | [
[
"Heras",
"C. Las",
""
],
[
"Leon",
"P.",
""
]
] | In this work we will analyse the complexity factor, proposed by L. Herrera, for spherically symmetric static matter distributions satisfying a polytropic equation through the gravitational decoupling method. Specifically, we will use the 2-step GD, which is a particular case of the extended geometric deformation (EGD),... |
2210.09063 | David Wallace | Oliver Pooley and David Wallace | First-class constraints generate gauge transformations in
electromagnetism (reply to Pitts) | 13 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Brian Pitts has recently claimed to show via straightforward calculation
that, at least in the case of Hamiltonian electromagnetism, an arbitrary
first-class constraint ``generates not a gauge transformation, but a bad
physical change'' (Annals of Physics 351 (2014) pp.382-406; arXiv:1310.2756).
We show, via a straig... | [
{
"created": "Mon, 17 Oct 2022 13:02:34 GMT",
"version": "v1"
}
] | 2022-10-18 | [
[
"Pooley",
"Oliver",
""
],
[
"Wallace",
"David",
""
]
] | Brian Pitts has recently claimed to show via straightforward calculation that, at least in the case of Hamiltonian electromagnetism, an arbitrary first-class constraint ``generates not a gauge transformation, but a bad physical change'' (Annals of Physics 351 (2014) pp.382-406; arXiv:1310.2756). We show, via a straight... |
1310.4699 | David Schinkel | David Schinkel, Rodrigo Panosso Macedo, Marcus Ansorg | Axisymmetric constant mean curvature slices in the Kerr space-time | 14 pages, 4 figures, Version published in CQG | David Schinkel et al 2014 Class. Quantum Grav. 31 075017 | 10.1088/0264-9381/31/7/075017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, there have been efforts to solve Einstein's equation in the context
of a conformal compactification of space-time. Of particular importance in this
regard are the so called CMC-foliations, characterized by spatial hyperboloidal
hypersurfaces with a constant extrinsic mean curvature K. However, although of
i... | [
{
"created": "Thu, 17 Oct 2013 13:37:07 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Apr 2014 10:15:26 GMT",
"version": "v2"
}
] | 2014-04-14 | [
[
"Schinkel",
"David",
""
],
[
"Macedo",
"Rodrigo Panosso",
""
],
[
"Ansorg",
"Marcus",
""
]
] | Recently, there have been efforts to solve Einstein's equation in the context of a conformal compactification of space-time. Of particular importance in this regard are the so called CMC-foliations, characterized by spatial hyperboloidal hypersurfaces with a constant extrinsic mean curvature K. However, although of int... |
2005.05183 | Gaurav Narain | Gaurav Narain, Hai-Qing Zhang | Cosmic evolution in novel-Gauss Bonnet Gravity | v2: references added, minor typos corrected | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this short paper we investigate any non-trivial effect the novel
Gauss-Bonnet gravity may give rise in the cosmic evolution of the Universe in
four spacetime dimensions. We start by considering a generic
Friedmann-Lema\^itre-Robertson-Walker (FLRW) metric respecting homogeneity and
isotropicity in arbitrary space-... | [
{
"created": "Mon, 11 May 2020 15:18:48 GMT",
"version": "v1"
},
{
"created": "Wed, 20 May 2020 12:19:20 GMT",
"version": "v2"
}
] | 2020-05-21 | [
[
"Narain",
"Gaurav",
""
],
[
"Zhang",
"Hai-Qing",
""
]
] | In this short paper we investigate any non-trivial effect the novel Gauss-Bonnet gravity may give rise in the cosmic evolution of the Universe in four spacetime dimensions. We start by considering a generic Friedmann-Lema\^itre-Robertson-Walker (FLRW) metric respecting homogeneity and isotropicity in arbitrary space-ti... |
2402.04017 | Mert Mangut | Mustafa Halilsoy, Chia-Li Hsieh and Mert Mangut | Colliding null matter with a specific stress tensor | Accepted by Physica Scripta | Phys. Scr. 99, 035023 (2024) | 10.1088/1402-4896/ad2757 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The accretion disks around black holes consist of infalling matter boosted
almost to the speed of light making collisions with opposite counterpart. This
is the rough picture occurring near black holes or other strongly gravitating
centers that produce observed phenomena such as astrophysical jets. A toy model
that c... | [
{
"created": "Tue, 6 Feb 2024 14:09:13 GMT",
"version": "v1"
}
] | 2024-02-19 | [
[
"Halilsoy",
"Mustafa",
""
],
[
"Hsieh",
"Chia-Li",
""
],
[
"Mangut",
"Mert",
""
]
] | The accretion disks around black holes consist of infalling matter boosted almost to the speed of light making collisions with opposite counterpart. This is the rough picture occurring near black holes or other strongly gravitating centers that produce observed phenomena such as astrophysical jets. A toy model that can... |
1602.05223 | Dnyaneshwar Pawar Dr | D. D. Pawar and V. J. Dagwal, S. P. Shahare | Tilted and Non Tilted C-Field Cosmological Models | 12 pages no figure | IOSR Journal of Mathematics (IOSR-JM) (Nov. - Dec.2016) | 10.9790/5728-120604104109 | Volume 12, Issue 6 Ver. IV (Nov. - Dec.2016), PP 104-109 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tilted and non tilted homogeneous plane symmetric C-field cosmological models
are investigated. Using the method of Narlikar and Padmanabhan [4], the
solutions have been presented when the creation field C is function of time t
only. To get the deterministic model, we have assumed the supplementary
condition between ... | [
{
"created": "Wed, 10 Feb 2016 12:48:59 GMT",
"version": "v1"
}
] | 2018-04-25 | [
[
"Pawar",
"D. D.",
""
],
[
"Dagwal",
"V. J.",
""
],
[
"Shahare",
"S. P.",
""
]
] | Tilted and non tilted homogeneous plane symmetric C-field cosmological models are investigated. Using the method of Narlikar and Padmanabhan [4], the solutions have been presented when the creation field C is function of time t only. To get the deterministic model, we have assumed the supplementary condition between pr... |
2110.09522 | Alexei Deriglazov A | Alexei A. Deriglazov | Comment on "Frame-dragging: meaning, myths, and misconceptions" by L. F.
O. Costa and J. Nat\'ario | 2 pages, +1 page. Taking into account the authors Reply, I added
further comments on the difference between their and Landau-Lifshitz
interpretations | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I point out that the authors' interpretation of their calculations differs
from the standard interpretation, described in Sect. 84 of Landau-Lifshitz
book. This casts doubt on the authors' claim that Sagnac effect "arises also in
apparatuses which are fixed relative to the distant stars (i.e., to
asymptotically inert... | [
{
"created": "Sun, 17 Oct 2021 18:14:46 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Nov 2021 23:29:57 GMT",
"version": "v2"
}
] | 2021-11-09 | [
[
"Deriglazov",
"Alexei A.",
""
]
] | I point out that the authors' interpretation of their calculations differs from the standard interpretation, described in Sect. 84 of Landau-Lifshitz book. This casts doubt on the authors' claim that Sagnac effect "arises also in apparatuses which are fixed relative to the distant stars (i.e., to asymptotically inertia... |
2112.05784 | Thomas Mieling | Thomas Mieling, Stefan Palenta | The Resolution of Ambiguities in Light Perturbation by Gravitational
Waves | 10 pages, 2 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Some previously published expressions for the perturbation of light by
gravitational waves exhibit pathological behaviour in the limit of parallel
propagation. We show that this is caused by similarly pathological initial or
boundary data and can thus be remedied by implementing better-behaved initial
conditions.
| [
{
"created": "Fri, 10 Dec 2021 19:12:04 GMT",
"version": "v1"
}
] | 2021-12-14 | [
[
"Mieling",
"Thomas",
""
],
[
"Palenta",
"Stefan",
""
]
] | Some previously published expressions for the perturbation of light by gravitational waves exhibit pathological behaviour in the limit of parallel propagation. We show that this is caused by similarly pathological initial or boundary data and can thus be remedied by implementing better-behaved initial conditions. |
1906.08532 | Titus K Mathew | Paxy George and Titus K Mathew | Bayesian analysis of running holographic Ricci dark energy | 15 pages and 7 figures | null | 10.1093/mnras/staa3156 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Holographic Ricci dark energy evolving through its interaction with dark
matter is a natural choice for the running vacuum energy model. We have
analyzed the relative significance of two versions of this model in the light
of SNIa, CMB, BAO and Hubble data sets using the method Bayesian inferences.
The first one, mod... | [
{
"created": "Thu, 20 Jun 2019 10:02:18 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jul 2019 09:50:40 GMT",
"version": "v2"
},
{
"created": "Wed, 14 Oct 2020 11:08:48 GMT",
"version": "v3"
}
] | 2020-10-21 | [
[
"George",
"Paxy",
""
],
[
"Mathew",
"Titus K",
""
]
] | Holographic Ricci dark energy evolving through its interaction with dark matter is a natural choice for the running vacuum energy model. We have analyzed the relative significance of two versions of this model in the light of SNIa, CMB, BAO and Hubble data sets using the method Bayesian inferences. The first one, model... |
2210.11057 | Matt Visser | Matt Visser (Victoria University of Wellington) and Stefano Liberati
(SISSA, IFPU, and INFN Trieste) | Painleve-Gullstrand coordinates versus Kerr spacetime geometry | 22 pages. Dedicated to the memory of Professor Thanu Padmanabhan. To
appear in the Professor Thanu Padmanabhan memorial volume published by
General Relativity and Gravitation | null | 10.1007/s10714-022-03025-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the tension between the possible existence of Painleve-Gullstrand
coordinate systems versus the explicit geometrical features of the Kerr
spacetime; a subject of interest to Professor Thanu Padmanabhan in the weeks
immediately preceding his unexpected death. We shall carefully distinguish
strong and weak P... | [
{
"created": "Thu, 20 Oct 2022 07:24:59 GMT",
"version": "v1"
}
] | 2022-11-30 | [
[
"Visser",
"Matt",
"",
"Victoria University of Wellington"
],
[
"Liberati",
"Stefano",
"",
"SISSA, IFPU, and INFN Trieste"
]
] | We discuss the tension between the possible existence of Painleve-Gullstrand coordinate systems versus the explicit geometrical features of the Kerr spacetime; a subject of interest to Professor Thanu Padmanabhan in the weeks immediately preceding his unexpected death. We shall carefully distinguish strong and weak Pai... |
1301.4569 | Sergei Maydanyuk | Sergei P. Maydanyuk, Antonino Del Popolo, Vladislav S. Olkhovsky | A fully quantum model of Big Bang | 29 pages, 12 figures. arXiv admin note: substantial text overlap with
arXiv:0812.5081, arXiv:1005.5447, arXiv:0707.0585 | null | null | null | gr-qc astro-ph.CO hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the paper the closed Friedmann-Robertson-Walker model with quantization in
the presence of the positive cosmological constant and radiation is studied.
For analysis of tunneling probability for birth of an asymptotically deSitter,
inflationary Universe as a function of the radiation energy a new definition of
a "f... | [
{
"created": "Sat, 19 Jan 2013 15:09:55 GMT",
"version": "v1"
}
] | 2013-01-22 | [
[
"Maydanyuk",
"Sergei P.",
""
],
[
"Del Popolo",
"Antonino",
""
],
[
"Olkhovsky",
"Vladislav S.",
""
]
] | In the paper the closed Friedmann-Robertson-Walker model with quantization in the presence of the positive cosmological constant and radiation is studied. For analysis of tunneling probability for birth of an asymptotically deSitter, inflationary Universe as a function of the radiation energy a new definition of a "fre... |
1607.04202 | Alexandre Le Tiec | Alexandre Le Tiec, J\'er\^ome Novak | Theory of Gravitational Waves | 40 pages, 10 figures, 2 tables; to appear in An Overview of
Gravitational Waves: Theory and Detection, edited by G. Auger and E. Plagnol
(World Scientific, 2016) | null | 10.1142/9789813141766_0001 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The existence of gravitational radiation is a natural prediction of any
relativistic description of the gravitational interaction. In this chapter, we
focus on gravitational waves, as predicted by Einstein's general theory of
relativity. First, we introduce those mathematical concepts that are necessary
to properly f... | [
{
"created": "Wed, 13 Jul 2016 16:07:23 GMT",
"version": "v1"
}
] | 2017-04-26 | [
[
"Tiec",
"Alexandre Le",
""
],
[
"Novak",
"Jérôme",
""
]
] | The existence of gravitational radiation is a natural prediction of any relativistic description of the gravitational interaction. In this chapter, we focus on gravitational waves, as predicted by Einstein's general theory of relativity. First, we introduce those mathematical concepts that are necessary to properly for... |
1809.07795 | Gabriele Benomio | Gabriele Benomio | The Stable Trapping Phenomenon for Black Strings and Black Rings and its
Obstructions on the Decay of Linear Waves | 60 pages | Analysis & PDE 14 (2021) 2427-2496 | 10.2140/apde.2021.14.2427 | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geometry of solutions to the higher dimensional Einstein vacuum equations
presents aspects that are absent in four dimensions, one of the most remarkable
being the existence of stably trapped null geodesics in the exterior of
asymptotically flat black holes. This paper investigates the stable trapping
phenomenon ... | [
{
"created": "Thu, 20 Sep 2018 18:36:08 GMT",
"version": "v1"
}
] | 2022-02-09 | [
[
"Benomio",
"Gabriele",
""
]
] | The geometry of solutions to the higher dimensional Einstein vacuum equations presents aspects that are absent in four dimensions, one of the most remarkable being the existence of stably trapped null geodesics in the exterior of asymptotically flat black holes. This paper investigates the stable trapping phenomenon fo... |
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