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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2405.20615 | James Ripple | James Ripple and Anish Agashe | The Tolman VII Space-time in the Presence of a Charge and a Cosmological
Constant | Comments are welcome | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The Tolman VII space-time is one of the few physically acceptable exact
solutions in general relativity. In this paper, we derive a generalised Tolman
VII solution which includes a charge and a cosmological constant. We analyse
the spatial geometry of the solution and present conditions for zero and
non-zero spatial ... | [
{
"created": "Fri, 31 May 2024 04:07:25 GMT",
"version": "v1"
}
] | 2024-06-03 | [
[
"Ripple",
"James",
""
],
[
"Agashe",
"Anish",
""
]
] | The Tolman VII space-time is one of the few physically acceptable exact solutions in general relativity. In this paper, we derive a generalised Tolman VII solution which includes a charge and a cosmological constant. We analyse the spatial geometry of the solution and present conditions for zero and non-zero spatial cu... |
0809.3730 | Slava G. Turyshev | Slava G. Turyshev | Experimental Tests of General Relativity: Recent Progress and Future
Directions | revtex4, 36 pages, 10 figures, 344 refs | Usp.Fiz.Nauk 179 (2009) 3-34 [Phys.Usp. 52 (2009) 1-27] | 10.3367/UFNe.0179.200901a.0003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Einstein's general theory of relativity is the standard theory of gravity,
especially where the needs of astronomy, astrophysics, cosmology and
fundamental physics are concerned. As such, this theory is used for many
practical purposes involving spacecraft navigation, geodesy and time transfer.
Here I review the foun... | [
{
"created": "Mon, 22 Sep 2008 15:50:01 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Jan 2009 08:39:59 GMT",
"version": "v2"
}
] | 2013-01-15 | [
[
"Turyshev",
"Slava G.",
""
]
] | Einstein's general theory of relativity is the standard theory of gravity, especially where the needs of astronomy, astrophysics, cosmology and fundamental physics are concerned. As such, this theory is used for many practical purposes involving spacecraft navigation, geodesy and time transfer. Here I review the founda... |
1608.07473 | Francesco Di Filippo | Carlos Barcel\'o, Ra\'ul Carballo-Rubio, Francesco Di Filippo, and
Luis J. Garay | From physical symmetries to emergent gauge symmetries | null | JHEP 1610 (2016) 084 | 10.1007/JHEP10(2016)084 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gauge symmetries indicate redundancies in the description of the relevant
degrees of freedom of a given field theory and restrict the nature of
observable quantities. One of the problems faced by emergent theories of
relativistic fields is to understand how gauge symmetries can show up in
systems that contain no trac... | [
{
"created": "Fri, 26 Aug 2016 14:32:21 GMT",
"version": "v1"
}
] | 2018-02-08 | [
[
"Barceló",
"Carlos",
""
],
[
"Carballo-Rubio",
"Raúl",
""
],
[
"Di Filippo",
"Francesco",
""
],
[
"Garay",
"Luis J.",
""
]
] | Gauge symmetries indicate redundancies in the description of the relevant degrees of freedom of a given field theory and restrict the nature of observable quantities. One of the problems faced by emergent theories of relativistic fields is to understand how gauge symmetries can show up in systems that contain no trace ... |
1608.05860 | Gregory Eskin | Gregory Eskin | Hawking radiation from acoustic black holes in two space dimensions | Final version to be published in the Journal of Math. Physics | Journal of Math. Physics, vol. 59, 072502 (2018) | null | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the Hawking radiation for the acoustic black hole. In the beginning
we follow the outline of T.Jacobson but then we use a different $2+1$ vacuum
state similar to the vacuum state constructed by W.Unruh. We also use a special
form of the wave packets. The focus of the paper is to treat the 2 dimensional
case,... | [
{
"created": "Sat, 20 Aug 2016 18:32:46 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Sep 2016 06:47:08 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Jan 2017 07:55:05 GMT",
"version": "v3"
},
{
"created": "Mon, 12 Jun 2017 01:09:10 GMT",
"version": "v4"
},
{
"c... | 2018-07-17 | [
[
"Eskin",
"Gregory",
""
]
] | We study the Hawking radiation for the acoustic black hole. In the beginning we follow the outline of T.Jacobson but then we use a different $2+1$ vacuum state similar to the vacuum state constructed by W.Unruh. We also use a special form of the wave packets. The focus of the paper is to treat the 2 dimensional case, i... |
1909.12773 | Alireza Talebian Ashkezari | Alireza Talebian, Amin Nassiri-Rad, Hassan Firouzjahi | Stochastic Effects in Anisotropic Inflation | null | Phys. Rev. D 101, 023524 (2020) | 10.1103/PhysRevD.101.023524 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit the stochastic effects in the model of anisotropic inflation
containing a $U(1)$ gauge field. We obtain the Langevin equations for the
inflaton and gauge fields perturbations and solve them analytically. We show
that if the initial value of the electric field is larger than its classical
attractor value, t... | [
{
"created": "Wed, 25 Sep 2019 11:29:01 GMT",
"version": "v1"
}
] | 2020-02-05 | [
[
"Talebian",
"Alireza",
""
],
[
"Nassiri-Rad",
"Amin",
""
],
[
"Firouzjahi",
"Hassan",
""
]
] | We revisit the stochastic effects in the model of anisotropic inflation containing a $U(1)$ gauge field. We obtain the Langevin equations for the inflaton and gauge fields perturbations and solve them analytically. We show that if the initial value of the electric field is larger than its classical attractor value, the... |
1205.4640 | Cosimo Bambi | Cosimo Bambi | A note on the observational evidence for the existence of event horizons
in astrophysical black hole candidates | 4 pages, no figures. v2: some typos corrected | The Scientific World Journal 2013:204315,2013 | 10.1155/2013/204315 | LMU-ASC-34-12 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Black holes have the peculiar and intriguing property of having an event
horizon, a one-way membrane causally separating their internal region from the
rest of the Universe. Today astrophysical observations provide some evidence
for the existence of event horizons in astrophysical black hole candidates. In
this short... | [
{
"created": "Mon, 21 May 2012 15:36:31 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Jun 2013 11:11:33 GMT",
"version": "v2"
}
] | 2013-09-10 | [
[
"Bambi",
"Cosimo",
""
]
] | Black holes have the peculiar and intriguing property of having an event horizon, a one-way membrane causally separating their internal region from the rest of the Universe. Today astrophysical observations provide some evidence for the existence of event horizons in astrophysical black hole candidates. In this short p... |
1210.2589 | Maqbool Ahmed | Maqbool Ahmed, Rafael Sorkin | Everpresent Lambda - II: Structural Stability | 15 pages, 6 figures, Thoroughly rewritten | null | 10.1103/PhysRevD.87.063515 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Ideas from causal set theory lead to a fluctuating, time dependent
cosmological-constant of the right order of magnitude to match currently quoted
"dark energy" values. Although such a term was predicted some time ago, a more
detailed analysis of the resulting class of phenomenological models was begun
only recently ... | [
{
"created": "Tue, 9 Oct 2012 13:12:35 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Nov 2012 10:03:53 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Dec 2012 06:53:30 GMT",
"version": "v3"
}
] | 2013-03-27 | [
[
"Ahmed",
"Maqbool",
""
],
[
"Sorkin",
"Rafael",
""
]
] | Ideas from causal set theory lead to a fluctuating, time dependent cosmological-constant of the right order of magnitude to match currently quoted "dark energy" values. Although such a term was predicted some time ago, a more detailed analysis of the resulting class of phenomenological models was begun only recently (b... |
1011.3982 | Simone Calogero | Simone Calogero, J. Mark Heinzle | Oscillations toward the singularity of LRS Bianchi type IX cosmological
models with Vlasov matter | 18 pages, 5 figures | SIAM J. Appl. Dyn. Syst. 9, 1244-1262 (2010) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the dynamics of a class of cosmological solutions of the
Einstein-Vlasov equations. These equations describe an ensemble of
collisionless particles (which represent galaxies or clusters of galaxies) that
interact gravitatively through Einstein's equations of general relativity. The
cosmological models we c... | [
{
"created": "Wed, 17 Nov 2010 15:47:50 GMT",
"version": "v1"
}
] | 2010-11-18 | [
[
"Calogero",
"Simone",
""
],
[
"Heinzle",
"J. Mark",
""
]
] | We analyze the dynamics of a class of cosmological solutions of the Einstein-Vlasov equations. These equations describe an ensemble of collisionless particles (which represent galaxies or clusters of galaxies) that interact gravitatively through Einstein's equations of general relativity. The cosmological models we con... |
1107.3347 | Rajesh R. Parwani | Rajesh R. Parwani and Siti Nursaba Tarih | Nonlinear Quantum Cosmology of de Sitter Space | Revised version has changed title, abstract and additional review and
clarifying remarks, with typos corrected and references updated. Results
unchanged. 23 pages inclusive of 9 figures | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We perform a minisuperspace analysis of an information-theoretic nonlinear
Wheeler-deWitt (WDW) equation for de Sitter universes. The nonlinear WDW
equation, which is in the form of a difference-differential equation, is
transformed into a pure difference equation for the probability density by
using the current cons... | [
{
"created": "Mon, 18 Jul 2011 01:30:51 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Mar 2012 12:47:07 GMT",
"version": "v2"
}
] | 2012-04-02 | [
[
"Parwani",
"Rajesh R.",
""
],
[
"Tarih",
"Siti Nursaba",
""
]
] | We perform a minisuperspace analysis of an information-theoretic nonlinear Wheeler-deWitt (WDW) equation for de Sitter universes. The nonlinear WDW equation, which is in the form of a difference-differential equation, is transformed into a pure difference equation for the probability density by using the current conser... |
1603.01128 | Jonathan Engle | Christopher Beetle, Jonathan S. Engle, Matthew E. Hogan, Phillip
Mendonca | Diffeomorphism invariant cosmological symmetry in full quantum gravity | 8 pages, invited submission for special issue of Int. J. Mod. Phys.
D; Remark added on use of intertwining condition to reduce quantization
ambiguities, assumptions on matter model made clear, sign convention for
complexification changed to match that of Thiemann, as well as minor
corrections | Int. J. Mod. Physics D 25 (2016) 1642012 [issue 8] | 10.1142/S0218271816420128 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper summarizes a new proposal to define rigorously a sector of loop
quantum gravity at the diffeomorphism invariant level corresponding to
homogeneous and isotropic cosmologies, thereby enabling a detailed comparison
of results in loop quantum gravity and loop quantum cosmology. The key
technical steps we have... | [
{
"created": "Thu, 3 Mar 2016 15:25:16 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Sep 2016 15:27:07 GMT",
"version": "v2"
}
] | 2016-09-12 | [
[
"Beetle",
"Christopher",
""
],
[
"Engle",
"Jonathan S.",
""
],
[
"Hogan",
"Matthew E.",
""
],
[
"Mendonca",
"Phillip",
""
]
] | This paper summarizes a new proposal to define rigorously a sector of loop quantum gravity at the diffeomorphism invariant level corresponding to homogeneous and isotropic cosmologies, thereby enabling a detailed comparison of results in loop quantum gravity and loop quantum cosmology. The key technical steps we have c... |
0808.1424 | Yousef Bisabr | Yousef Bisabr | Holographic Dark Energy Model and Scalar-Tensor Theories | 11 pages, no figure. To appear in General Relativity and Gravitation | Gen.Rel.Grav.41:305-313,2009 | 10.1007/s10714-008-0676-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the holographic dark energy model in a generalized scalar tensor
theory. In a universe filled with cold dark matter and dark energy, the effect
of potential of the scalar field is investigated in the equation of state
parameter. We show that for a various types of potentials, the equation of
state parameter ... | [
{
"created": "Sun, 10 Aug 2008 19:42:00 GMT",
"version": "v1"
}
] | 2009-02-18 | [
[
"Bisabr",
"Yousef",
""
]
] | We study the holographic dark energy model in a generalized scalar tensor theory. In a universe filled with cold dark matter and dark energy, the effect of potential of the scalar field is investigated in the equation of state parameter. We show that for a various types of potentials, the equation of state parameter is... |
1603.04291 | Thiago Pereira | Thiago S. Pereira and Davincy T. Pabon | Extending the LCDM model through shear-free anisotropies | 12 pages, 2 figures. Proceedings of the 1st Workshop on Inflation and
the Origin of the CMB Anomalies held at Cali -- Colombia, May 2015 | null | 10.1142/S0217732316400095 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | If the spacetime metric has anisotropic spatial curvature, one can afford to
expand the universe isotropically, provided that the energy-momentum tensor
satisfy a certain con- straint. This leads to the so-called shear-free metrics,
which have the interesting property of violating the cosmological principle
while sti... | [
{
"created": "Mon, 14 Mar 2016 14:59:11 GMT",
"version": "v1"
}
] | 2016-07-20 | [
[
"Pereira",
"Thiago S.",
""
],
[
"Pabon",
"Davincy T.",
""
]
] | If the spacetime metric has anisotropic spatial curvature, one can afford to expand the universe isotropically, provided that the energy-momentum tensor satisfy a certain con- straint. This leads to the so-called shear-free metrics, which have the interesting property of violating the cosmological principle while still... |
gr-qc/0010018 | Tatyana P. Shestakova | T. P. Shestakova | The status of the Lambda term in quantum geometrodynamics in extended
phase space | LaTeX, 6 pages, talk presented at the IV International Conference
"Cosmion-99", Moscow, October 1999, to be published in the Conference
Proceedings | Grav.Cosmol.Suppl.6:47-50,2000 | null | null | gr-qc | null | S. Weinberg pointed out a way to introduce a cosmological term by modifying
the theory of gravity. This modification would be justified if the Einstein
equations with the cosmological term could be obtained in the classical limit
of some physically satisfied quantum theory of gravity. We propose to consider
quantum g... | [
{
"created": "Thu, 5 Oct 2000 11:47:58 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Shestakova",
"T. P.",
""
]
] | S. Weinberg pointed out a way to introduce a cosmological term by modifying the theory of gravity. This modification would be justified if the Einstein equations with the cosmological term could be obtained in the classical limit of some physically satisfied quantum theory of gravity. We propose to consider quantum geo... |
2405.17302 | Maria Rossell\'o-Sastre | Maria Rossell\'o-Sastre, Sascha Husa, Sayantani Bera | A waveform model for the missing quadrupole mode from black hole
coalescence: memory effect and ringdown of the $(\ell=2,m=0)$ spherical
harmonic | 20 pages, 13 figures | null | null | LIGO-P2400208 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this paper we describe a model for the $(\ell=2, m=0)$ spherical harmonic
mode of the gravitational wave signal emitted by the coalescence of binary
black holes, in particular, spin-aligned systems. This mode can be viewed as
consisting of two components, gravitational wave memory and quasi-normal
ringdown, which ... | [
{
"created": "Mon, 27 May 2024 16:03:52 GMT",
"version": "v1"
}
] | 2024-05-28 | [
[
"Rosselló-Sastre",
"Maria",
""
],
[
"Husa",
"Sascha",
""
],
[
"Bera",
"Sayantani",
""
]
] | In this paper we describe a model for the $(\ell=2, m=0)$ spherical harmonic mode of the gravitational wave signal emitted by the coalescence of binary black holes, in particular, spin-aligned systems. This mode can be viewed as consisting of two components, gravitational wave memory and quasi-normal ringdown, which ar... |
1912.07068 | Hexu Zhang | He-Xu Zhang, Cong Li, Peng-Zhang He, Qi-Qi Fan, Jian-Bo Deng | Optical properties of a Brane-World black hole as photons couple to the
Weyl tensor | arXiv admin note: text overlap with arXiv:1502.01088,
arXiv:1611.08783, arXiv:1606.04634 by other authors | null | 10.1140/epjc/s10052-020-8022-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article, we have investigated the equations of motion of the photons
coupled to Weyl tensor by the geometric optics approximation and the
corresponding shadow in a Brane-World black hole spacetime. It is shown that
there exists a double shadow for a black hole since the coupling photons with
different polariz... | [
{
"created": "Sun, 15 Dec 2019 16:38:25 GMT",
"version": "v1"
},
{
"created": "Fri, 6 Mar 2020 09:06:54 GMT",
"version": "v2"
}
] | 2020-06-24 | [
[
"Zhang",
"He-Xu",
""
],
[
"Li",
"Cong",
""
],
[
"He",
"Peng-Zhang",
""
],
[
"Fan",
"Qi-Qi",
""
],
[
"Deng",
"Jian-Bo",
""
]
] | In this article, we have investigated the equations of motion of the photons coupled to Weyl tensor by the geometric optics approximation and the corresponding shadow in a Brane-World black hole spacetime. It is shown that there exists a double shadow for a black hole since the coupling photons with different polarizat... |
1510.00621 | Jeff Steinhauer | Jeff Steinhauer | Observation of quantum Hawking radiation and its entanglement in an
analogue black hole | The latest version has additional data and explanations | Nature Phys. 12, 959 (2016) | 10.1038/nphys3863 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We observe spontaneous Hawking radiation, stimulated by quantum vacuum
fluctuations, emanating from an analogue black hole in an atomic Bose-Einstein
condensate. Correlations are observed between the Hawking particles outside the
black hole and the partner particles inside. These correlations indicate an
approximatel... | [
{
"created": "Fri, 2 Oct 2015 15:27:27 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Oct 2015 15:07:32 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Aug 2017 12:22:51 GMT",
"version": "v3"
}
] | 2017-08-09 | [
[
"Steinhauer",
"Jeff",
""
]
] | We observe spontaneous Hawking radiation, stimulated by quantum vacuum fluctuations, emanating from an analogue black hole in an atomic Bose-Einstein condensate. Correlations are observed between the Hawking particles outside the black hole and the partner particles inside. These correlations indicate an approximately ... |
2307.12031 | Alejandro Perez | Alejandro Perez, Salvatore Ribisi | Light-cone thermodynamics: purification of the Minkowski vacuum | Typos corrected | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explicitly express the Minkowski vacuum of a massless scalar field in
terms of the particle notion associated with suitable spherical conformal
killing fields. These fields are orthogonal to the light wavefronts originating
from a sphere with a radius of $r_{H}$ in flat spacetime: a bifurcate conformal
killing hor... | [
{
"created": "Sat, 22 Jul 2023 09:35:58 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Feb 2024 14:39:53 GMT",
"version": "v2"
}
] | 2024-02-20 | [
[
"Perez",
"Alejandro",
""
],
[
"Ribisi",
"Salvatore",
""
]
] | We explicitly express the Minkowski vacuum of a massless scalar field in terms of the particle notion associated with suitable spherical conformal killing fields. These fields are orthogonal to the light wavefronts originating from a sphere with a radius of $r_{H}$ in flat spacetime: a bifurcate conformal killing horiz... |
gr-qc/0701073 | Luis Herrera | L. Herrera | The inertia of heat and its role in the dynamics of dissipative collapse | Latex file. To appear in Int.J.Mod.Phys.D. Year of reference [1]
corrected | Int.J.Mod.Phys.D15:2197-2202,2006 | 10.1142/S0218271806009753 | null | gr-qc astro-ph physics.space-ph | null | The decreasing of the inertial mass density, established in the past for
dissipative fluids, is found to be produced by the ``inertial'' term of the
transport equation. Once the transport equation is coupled to the dynamical
equation one finds that the contribution of the inertial term diminishes the
effective inerti... | [
{
"created": "Mon, 15 Jan 2007 18:39:42 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Apr 2007 16:02:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Herrera",
"L.",
""
]
] | The decreasing of the inertial mass density, established in the past for dissipative fluids, is found to be produced by the ``inertial'' term of the transport equation. Once the transport equation is coupled to the dynamical equation one finds that the contribution of the inertial term diminishes the effective inertial... |
gr-qc/9807063 | Bahram Mashhoon | B. Mashhoon (University of Missouri-Columbia) and N. O. Santos (Cidade
Universitaria) | Rotating Cylindrical Systems and Gravitomagnetism | LaTeX file, 22 pages, no figures, submitted to Phys. Rev. D | Annalen Phys. 9 (2000) 49-63 | 10.1002/(SICI)1521-3889(200001)9:1<49::AID-ANDP49>3.0.CO;2-2 | null | gr-qc | null | We discuss gravitomagnetism in connection with rotating cylindrical systems.
In particular, the gravitomagnetic clock effect is investigated for the
exterior vacuum field of an infinite rotating cylinder. The dependence of the
clock effect on the Weyl parameters of the stationary Lewis metric is
determined. We illust... | [
{
"created": "Thu, 23 Jul 1998 04:35:03 GMT",
"version": "v1"
}
] | 2017-09-27 | [
[
"Mashhoon",
"B.",
"",
"University of Missouri-Columbia"
],
[
"Santos",
"N. O.",
"",
"Cidade\n Universitaria"
]
] | We discuss gravitomagnetism in connection with rotating cylindrical systems. In particular, the gravitomagnetic clock effect is investigated for the exterior vacuum field of an infinite rotating cylinder. The dependence of the clock effect on the Weyl parameters of the stationary Lewis metric is determined. We illustra... |
1009.1096 | Swastik Bhattacharya | Swastik Bhattacharya, Pankaj S. Joshi | Regularity of initial data in dynamical massless scalar field models | 5 pages, No figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss here the issue of regularity of initial data for dynamical
spherically symmetric massless scalar field models in a spacetime. Generalizing
the known solutions of Einstein equations given in this case by Wyman and
Roberts, we examine the issue of regularity on a given spacelike surface,
especially when the ... | [
{
"created": "Mon, 6 Sep 2010 17:08:52 GMT",
"version": "v1"
}
] | 2010-09-07 | [
[
"Bhattacharya",
"Swastik",
""
],
[
"Joshi",
"Pankaj S.",
""
]
] | We discuss here the issue of regularity of initial data for dynamical spherically symmetric massless scalar field models in a spacetime. Generalizing the known solutions of Einstein equations given in this case by Wyman and Roberts, we examine the issue of regularity on a given spacelike surface, especially when the gr... |
1801.07261 | Shahar Hod | Shahar Hod | Strong cosmic censorship in charged black-hole spacetimes: As strong as
ever | 7 pages | Nuclear Physics B 941, 636 (2019) | 10.1016/j.nuclphysb.2019.03.003 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is proved that dynamically formed Reissner-Nordstr\"om-de Sitter (RNdS)
black holes, which have recently been claimed to provide counter-examples to
the Penrose strong cosmic censorship conjecture, are characterized by unstable
(singular) inner Cauchy horizons. The proof is based on analytical techniques
which exp... | [
{
"created": "Mon, 22 Jan 2018 19:00:03 GMT",
"version": "v1"
}
] | 2019-05-01 | [
[
"Hod",
"Shahar",
""
]
] | It is proved that dynamically formed Reissner-Nordstr\"om-de Sitter (RNdS) black holes, which have recently been claimed to provide counter-examples to the Penrose strong cosmic censorship conjecture, are characterized by unstable (singular) inner Cauchy horizons. The proof is based on analytical techniques which expli... |
1205.0118 | Yuki Kanai | Yuki Kanai and Akio Hosoya | Hawking radiation from a collapsing dust sphere and its back reaction at
the event horizon -Weak value approach- | 13 pages, 1 figure | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To see the back reaction of the Hawking radiation in a dynamical spacetime of
the spherical gravitational collapse, we explicitly calculate the weak value of
the energy-momentum tensor of the massless scalar field. The background
geometry of a collapsing dust sphere is specified by using the
Painleve-Gullstrand coord... | [
{
"created": "Tue, 1 May 2012 09:02:21 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Mar 2013 08:59:00 GMT",
"version": "v2"
}
] | 2015-03-20 | [
[
"Kanai",
"Yuki",
""
],
[
"Hosoya",
"Akio",
""
]
] | To see the back reaction of the Hawking radiation in a dynamical spacetime of the spherical gravitational collapse, we explicitly calculate the weak value of the energy-momentum tensor of the massless scalar field. The background geometry of a collapsing dust sphere is specified by using the Painleve-Gullstrand coordin... |
1709.04367 | Ravindra Saraykar Dr. | R V Saraykar and Sujatha Janardhan | Role of Topologies in the Study of Dynamical Aspects of Stable and
Generic Properties of Space-times in General Relativity | arXiv admin note: substantial text overlap with arXiv:1612.08812,
arXiv:1609.07703 | Asian Journal of Mathematics and Computer Research, Vol.20, Issue
1 (2017) 22-31 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In [1], the authors have studied stability of certain causal properties of
space-times in general relativity. As a continuation of this work, in the
present paper, we review and discuss, some more aspects of stability which
occur in various situations in the dynamics of general relativity. We argue
that not only choi... | [
{
"created": "Tue, 12 Sep 2017 07:08:23 GMT",
"version": "v1"
}
] | 2017-09-14 | [
[
"Saraykar",
"R V",
""
],
[
"Janardhan",
"Sujatha",
""
]
] | In [1], the authors have studied stability of certain causal properties of space-times in general relativity. As a continuation of this work, in the present paper, we review and discuss, some more aspects of stability which occur in various situations in the dynamics of general relativity. We argue that not only choice... |
1101.4311 | Mohammad Vahid Takook | H. Pejhan, M.R. Tanhayi and M.V. Takook | Auxiliary "massless" spin-2 field in de Sitter universe | 16 pages | Int.J.Theor.Phys.49:2263-2277,2010 | 10.1007/s10773-010-0413-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For the tensor field of rank-2 there are two unitary irreducible
representation (UIR) in de Sitter (dS) space denoted by $\Pi^{\pm}_{2,2}$ and
$\Pi^{\pm}_{2,1}$ [1]. In the flat limit only the $\Pi^{\pm}_{2,2}$ coincides
to the UIR of Poincar\'e group, the second one becomes important in the study
of conformal gravit... | [
{
"created": "Sat, 22 Jan 2011 19:27:43 GMT",
"version": "v1"
}
] | 2011-01-27 | [
[
"Pejhan",
"H.",
""
],
[
"Tanhayi",
"M. R.",
""
],
[
"Takook",
"M. V.",
""
]
] | For the tensor field of rank-2 there are two unitary irreducible representation (UIR) in de Sitter (dS) space denoted by $\Pi^{\pm}_{2,2}$ and $\Pi^{\pm}_{2,1}$ [1]. In the flat limit only the $\Pi^{\pm}_{2,2}$ coincides to the UIR of Poincar\'e group, the second one becomes important in the study of conformal gravity.... |
gr-qc/0702079 | Valerio Faraoni | Valerio Faraoni (Bishop's University) | A common misconception about LIGO detectors of gravitational waves | 9 pages, LaTeX, to appear in Gen. Rel. Grav | Gen.Rel.Grav.39:677-684.2007 | 10.1007/s10714-007-0415-5 | null | gr-qc | null | A common misconception about laser interferometric detectors of gravitational
waves purports that, because the wavelength of laser light and the length of an
interferometer's arm are both stretched by a gravitational wave, no effect
should be visible, invoking an analogy with cosmological redshift in an
expanding uni... | [
{
"created": "Wed, 14 Feb 2007 14:29:33 GMT",
"version": "v1"
}
] | 2014-11-17 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
]
] | A common misconception about laser interferometric detectors of gravitational waves purports that, because the wavelength of laser light and the length of an interferometer's arm are both stretched by a gravitational wave, no effect should be visible, invoking an analogy with cosmological redshift in an expanding unive... |
1807.10361 | Jose Navarro-Salas | Antonio Ferreiro, Jose Navarro-Salas and Silvia Pla | Role of gravity in the pair creation induced by electric fields | Latex file, 7 pages. Misprints corrected. Slight change in title | Phys. Rev. D 98, 045015 (2018) | 10.1103/PhysRevD.98.045015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the pair production induced by homogenous, time-dependent electric
fields in an expanding space-time background. We point out that, in obtaining
the semiclassical Maxwell equations, two distinct notions of adiabatic
renormalization are possible. In Minkowski space the two recipes turn out to be
equivalent.... | [
{
"created": "Thu, 26 Jul 2018 20:50:42 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Sep 2018 14:54:10 GMT",
"version": "v2"
}
] | 2018-09-20 | [
[
"Ferreiro",
"Antonio",
""
],
[
"Navarro-Salas",
"Jose",
""
],
[
"Pla",
"Silvia",
""
]
] | We analyze the pair production induced by homogenous, time-dependent electric fields in an expanding space-time background. We point out that, in obtaining the semiclassical Maxwell equations, two distinct notions of adiabatic renormalization are possible. In Minkowski space the two recipes turn out to be equivalent. H... |
0810.2209 | Stefano Viaggiu | Stefano Viaggiu | Modeling usual and unusual anisotropic spheres | Final version published in IJMPD | Int.J.Mod.Phys.D18:275-288,2009 | 10.1142/S021827180901442X | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study anisotropic spheres built from known static spherical
solutions. In particular, we are interested in the physical consequences of a
"small" departure from a physically sensible configuration. The obtained
solutions smoothly depend on free parameters. By setting these parameters to
zero, the st... | [
{
"created": "Mon, 13 Oct 2008 11:24:12 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Apr 2009 11:16:09 GMT",
"version": "v2"
}
] | 2009-04-17 | [
[
"Viaggiu",
"Stefano",
""
]
] | In this paper, we study anisotropic spheres built from known static spherical solutions. In particular, we are interested in the physical consequences of a "small" departure from a physically sensible configuration. The obtained solutions smoothly depend on free parameters. By setting these parameters to zero, the star... |
gr-qc/0511116 | Jared Maruskin | Jared M. Maruskin | Considerations of a $k=+1$ Varluminopic Cosmology | 24 pages | null | null | null | gr-qc astro-ph | null | Every relativistic particle has 4-speed equal to $c$, since $g_{\mu \nu}
\frac{dx^\mu}{d\tau} \frac{dx^\nu}{d\tau} = c^2$. With the choice of $k = +1$
in the FRW metric, the cosmological scale factor $a(t)$ has the natural
interpretation of the radius of the sphere $S^3_a = \{x \in \mathbb{R}^4 : (x,
x) = a^2\}$. Thu... | [
{
"created": "Mon, 21 Nov 2005 19:21:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Maruskin",
"Jared M.",
""
]
] | Every relativistic particle has 4-speed equal to $c$, since $g_{\mu \nu} \frac{dx^\mu}{d\tau} \frac{dx^\nu}{d\tau} = c^2$. With the choice of $k = +1$ in the FRW metric, the cosmological scale factor $a(t)$ has the natural interpretation of the radius of the sphere $S^3_a = \{x \in \mathbb{R}^4 : (x, x) = a^2\}$. Thus,... |
gr-qc/9504021 | Bill Hiscock | Tsunefumi Tanaka and William A. Hiscock (Montana State University) | Massive scalar field in multiply connected flat spacetimes | 19 pages, REVTeX, 5 figures in separate uuencoded compressed file | Phys.Rev.D52:4503-4511,1995 | 10.1103/PhysRevD.52.4503 | null | gr-qc | null | The vacuum expectation value of the stress-energy tensor $\left\langle
0\left| T_{\mu\nu} \right|0\right\rangle$ is calculated in several multiply
connected flat spacetimes for a massive scalar field with arbitrary curvature
coupling. We find that a nonzero field mass always decreases the magnitude of
the energy dens... | [
{
"created": "Fri, 14 Apr 1995 17:17:49 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Tanaka",
"Tsunefumi",
"",
"Montana State University"
],
[
"Hiscock",
"William A.",
"",
"Montana State University"
]
] | The vacuum expectation value of the stress-energy tensor $\left\langle 0\left| T_{\mu\nu} \right|0\right\rangle$ is calculated in several multiply connected flat spacetimes for a massive scalar field with arbitrary curvature coupling. We find that a nonzero field mass always decreases the magnitude of the energy densit... |
1905.12428 | Mohammad Ghanaatian | A. Bazrafshan, F. Naeimipour, M. Ghanaatian, A. Khajeh | Physical and thermodynamic properties of quartic quasitopological black
holes and rotating black branes with nonlinear source | 14 pages, 7 figures | Phys. Rev. D 100, 064062 (2019) | 10.1103/PhysRevD.100.064062 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we find the solutions of quartic quasitopological black holes
and branes coupled to logarithmic and exponential forms of nonlinear
electrodynamics. These solutions have an essential singularity at $r=0$.
Depending on the value of charge parameter $q$, we have an extreme black
hole/brane, a black hole/b... | [
{
"created": "Mon, 27 May 2019 22:12:57 GMT",
"version": "v1"
}
] | 2019-10-02 | [
[
"Bazrafshan",
"A.",
""
],
[
"Naeimipour",
"F.",
""
],
[
"Ghanaatian",
"M.",
""
],
[
"Khajeh",
"A.",
""
]
] | In this paper, we find the solutions of quartic quasitopological black holes and branes coupled to logarithmic and exponential forms of nonlinear electrodynamics. These solutions have an essential singularity at $r=0$. Depending on the value of charge parameter $q$, we have an extreme black hole/brane, a black hole/bra... |
0704.2670 | Adrian Sabin Popescu | Adrian Sabin Popescu | D.E.U.S. (Dimension Embedded in Unified Symmetry) | 247 pages, 113 figures; We merged all the DEUS model papers in a
single volume | null | null | null | gr-qc | null | An unified model of the Universe, Black Holes, particles .... and beyond.
| [
{
"created": "Fri, 20 Apr 2007 08:41:41 GMT",
"version": "v1"
},
{
"created": "Mon, 7 May 2007 12:51:50 GMT",
"version": "v2"
}
] | 2009-09-29 | [
[
"Popescu",
"Adrian Sabin",
""
]
] | An unified model of the Universe, Black Holes, particles .... and beyond. |
2407.07156 | Valerio De Luca | Valerio De Luca, Alice Garoffolo, Justin Khoury, Mark Trodden | Tidal Love numbers and Green's functions in black hole space-times | 18 pages, 3 figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Tidal interactions play a crucial role in deciphering gravitational wave
signals emitted by the coalescence of binary systems. They are usually
quantified by a set of complex coefficients which include tidal Love numbers,
describing the conservative response to an external perturbation. In the static
case, these are ... | [
{
"created": "Tue, 9 Jul 2024 18:00:09 GMT",
"version": "v1"
}
] | 2024-07-11 | [
[
"De Luca",
"Valerio",
""
],
[
"Garoffolo",
"Alice",
""
],
[
"Khoury",
"Justin",
""
],
[
"Trodden",
"Mark",
""
]
] | Tidal interactions play a crucial role in deciphering gravitational wave signals emitted by the coalescence of binary systems. They are usually quantified by a set of complex coefficients which include tidal Love numbers, describing the conservative response to an external perturbation. In the static case, these are fo... |
1101.1391 | Walter Del Pozzo | Walter Del Pozzo, John Veitch and Alberto Vecchio | Testing General Relativity using Bayesian model selection: Applications
to observations of gravitational waves from compact binary systems | Submitted to PRD | Phys.Rev.D83:082002,2011 | 10.1103/PhysRevD.83.082002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Second generation interferometric gravitational wave detectors, such as
Advanced LIGO and Advanced Virgo, are expected to begin operation by 2015. Such
instruments plan to reach sensitivities that will offer the unique possibility
to test General Relativity in the dynamical, strong field regime and
investigate depart... | [
{
"created": "Fri, 7 Jan 2011 09:44:53 GMT",
"version": "v1"
}
] | 2015-03-17 | [
[
"Del Pozzo",
"Walter",
""
],
[
"Veitch",
"John",
""
],
[
"Vecchio",
"Alberto",
""
]
] | Second generation interferometric gravitational wave detectors, such as Advanced LIGO and Advanced Virgo, are expected to begin operation by 2015. Such instruments plan to reach sensitivities that will offer the unique possibility to test General Relativity in the dynamical, strong field regime and investigate departur... |
gr-qc/0201016 | Ian G. Moss | Ian G Moss and James P Norman | Gravitational quasinormal modes for Anti-de Sitter black holes | 12 pages, 6 figures in ReVTeX | Class.Quant.Grav. 19 (2002) 2323-2332 | 10.1088/0264-9381/19/8/319 | null | gr-qc | null | Quasinormal mode spectra for gravitational perturbations of black holes in
four dimensional de Sitter and anti-de Sitter space are investigated. The
anti-de Sitter case is relevant to the ADS-CFT correspondence in superstring
theory. The ADS-CFT correspondence suggests a prefered set of boundary
conditions.
| [
{
"created": "Sun, 6 Jan 2002 12:18:24 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Jan 2002 11:01:56 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Moss",
"Ian G",
""
],
[
"Norman",
"James P",
""
]
] | Quasinormal mode spectra for gravitational perturbations of black holes in four dimensional de Sitter and anti-de Sitter space are investigated. The anti-de Sitter case is relevant to the ADS-CFT correspondence in superstring theory. The ADS-CFT correspondence suggests a prefered set of boundary conditions. |
2305.12037 | Hoang Nguyen | Hoang Ky Nguyen | Non-triviality of asymptotically flat Buchdahl-inspired metrics in pure
$R^2$ gravity | 7 pages, 1 figure | Mod. Phys. Lett. A (2023) 2450100 | 10.1142/S0217732324501001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Phys. Rev. D $\textbf{107}$, 104008 (2023) we reported a novel exact
closed-form solution which describes asymptotically flat spacetimes in pure
$R^2$ gravity. The solution is Ricci scalar flat, viz. $R\equiv0$ everywhere.
Whereas any metric with a null Ricci scalar would $\textit{trivially}$ satisfy
the $R^2$ vac... | [
{
"created": "Fri, 19 May 2023 23:36:37 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Oct 2023 16:19:45 GMT",
"version": "v2"
},
{
"created": "Tue, 28 May 2024 17:58:04 GMT",
"version": "v3"
}
] | 2024-07-09 | [
[
"Nguyen",
"Hoang Ky",
""
]
] | In Phys. Rev. D $\textbf{107}$, 104008 (2023) we reported a novel exact closed-form solution which describes asymptotically flat spacetimes in pure $R^2$ gravity. The solution is Ricci scalar flat, viz. $R\equiv0$ everywhere. Whereas any metric with a null Ricci scalar would $\textit{trivially}$ satisfy the $R^2$ vacuo... |
gr-qc/0608130 | Jose Ademir Sales Lima | R. C. Santos, J. Santos, J. A. S. Lima | Hamilton-Jacobi Approach for Power-Law Potentials | 12 pages, Latex | Braz.J.Phys. 36 (2006) 1257-1261 | 10.1590/S0103-97332006000700024 | null | gr-qc | null | The classical and relativistic Hamilton-Jacobi approach is applied to the
one-dimensional homogeneous potential, $V(q)=\alpha q^n$, where $\alpha$ and
$n$ are continuously varying parameters. In the non-relativistic case, the
exact analytical solution is determined in terms of $\alpha$, $n$ and the total
energy $E$. ... | [
{
"created": "Wed, 30 Aug 2006 02:06:10 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Santos",
"R. C.",
""
],
[
"Santos",
"J.",
""
],
[
"Lima",
"J. A. S.",
""
]
] | The classical and relativistic Hamilton-Jacobi approach is applied to the one-dimensional homogeneous potential, $V(q)=\alpha q^n$, where $\alpha$ and $n$ are continuously varying parameters. In the non-relativistic case, the exact analytical solution is determined in terms of $\alpha$, $n$ and the total energy $E$. It... |
1409.3046 | Rafael Ribeiro | Rafael Ribeiro and Jorge P\'aramos | Dynamical analysis of nonminimal coupled theories | 13 pages, 10 figures, 7 tables. Published version | Phys. Rev. D 90, 124065, 2014 | 10.1103/PhysRevD.90.124065 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work a dynamical system approach to nonminimal coupled f(R) theories
is made. The solutions of three distinct models are obtained and their
stability and physical interpretation are studied to ascertain their viability
as candidates for dark energy. Comparison is drawn with previous works in the
context of f(... | [
{
"created": "Wed, 10 Sep 2014 12:46:40 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Jan 2015 01:53:57 GMT",
"version": "v2"
}
] | 2015-01-06 | [
[
"Ribeiro",
"Rafael",
""
],
[
"Páramos",
"Jorge",
""
]
] | In this work a dynamical system approach to nonminimal coupled f(R) theories is made. The solutions of three distinct models are obtained and their stability and physical interpretation are studied to ascertain their viability as candidates for dark energy. Comparison is drawn with previous works in the context of f(R)... |
gr-qc/0403020 | Valerio Faraoni | Valerio Faraoni (University of Northern British Columbia) | Singularities in scalar-tensor gravity | 6 pages, LaTeX | Phys.Rev. D70 (2004) 047301 | 10.1103/PhysRevD.70.047301 | null | gr-qc | null | The analysis of certain singularities in scalar-tensor gravity contained in a
recent paper is completed, and situations are pointed out in which these
singularities cannot occur.
| [
{
"created": "Wed, 3 Mar 2004 22:15:26 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Faraoni",
"Valerio",
"",
"University of Northern British Columbia"
]
] | The analysis of certain singularities in scalar-tensor gravity contained in a recent paper is completed, and situations are pointed out in which these singularities cannot occur. |
2006.14928 | Shankar Dayal Pathak | A Kundu, S D Pathak, and V K Ojha | Interacting tachyonic scalar field | V1 | Commun. Theor. Phys. 73 025402(2021) | 10.1088/1572-9494/abcfb1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the coupling between dark energy and matter by considering a
homogeneous tachyonic scalar field as a candidate for dark energy. We obtained
the functional form of scale factor by assuming that the coupling strength
depends linearly on the Hubble parameter and energy density. We also estimated
the cosmic ag... | [
{
"created": "Thu, 25 Jun 2020 02:57:58 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Jan 2021 19:18:13 GMT",
"version": "v2"
}
] | 2021-01-27 | [
[
"Kundu",
"A",
""
],
[
"Pathak",
"S D",
""
],
[
"Ojha",
"V K",
""
]
] | We discuss the coupling between dark energy and matter by considering a homogeneous tachyonic scalar field as a candidate for dark energy. We obtained the functional form of scale factor by assuming that the coupling strength depends linearly on the Hubble parameter and energy density. We also estimated the cosmic age ... |
gr-qc/9607074 | Maurice van Putten | Maurice H.P.M. van Putten | Approximate Black Holes for Numerical Relativity | Postscript, 2 figures | Phys.Rev.D54:5931-5934,1996 | 10.1103/PhysRevD.54.R5931 | null | gr-qc | null | Spherically symmetric solutions in Brans-Dicke theory of relativity with zero
coupling constant, $\omega=0$, are derived in the Schwarzschild line-element.
The solutions are obtained from a cubic transition equation with one small
parameter. The exterior space-time of one family of solutions is arbitrarily
close to t... | [
{
"created": "Tue, 30 Jul 1996 19:12:21 GMT",
"version": "v1"
}
] | 2009-12-30 | [
[
"van Putten",
"Maurice H. P. M.",
""
]
] | Spherically symmetric solutions in Brans-Dicke theory of relativity with zero coupling constant, $\omega=0$, are derived in the Schwarzschild line-element. The solutions are obtained from a cubic transition equation with one small parameter. The exterior space-time of one family of solutions is arbitrarily close to the... |
1705.09662 | Lavinia Heisenberg | Lavinia Heisenberg, Ryotaro Kase, Masato Minamitsuji and Shinji
Tsujikawa | Hairy black-hole solutions in generalized Proca theories | 5 pages, 1 figure, published version | Phys. Rev. D 96, 084049 (2017) | 10.1103/PhysRevD.96.084049 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a family of exact black-hole solutions on a static spherically
symmetric background in second-order generalized Proca theories with derivative
vector-field interactions coupled to gravity. We also derive non-exact
solutions in power-law coupling models including vector Galileons and
numerically show the ex... | [
{
"created": "Fri, 26 May 2017 18:00:01 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Oct 2017 15:27:08 GMT",
"version": "v2"
}
] | 2017-11-01 | [
[
"Heisenberg",
"Lavinia",
""
],
[
"Kase",
"Ryotaro",
""
],
[
"Minamitsuji",
"Masato",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We present a family of exact black-hole solutions on a static spherically symmetric background in second-order generalized Proca theories with derivative vector-field interactions coupled to gravity. We also derive non-exact solutions in power-law coupling models including vector Galileons and numerically show the exis... |
gr-qc/9608027 | Manuela Campanelli | Manuela Campanelli (U. Bern) and Carlos O. Lousto (U. Utah) | Semiclassical models for uniform-density Cosmic Strings and Relativistic
Stars | 19 pages, REVTEX, no figures | Int.J.Mod.Phys. D6 (1997) 771-784 | 10.1142/S0218271897000455 | null | gr-qc hep-th | null | In this paper we show how quantum corrections, although perturbatively small,
may play an important role in the analysis of the existence of some classical
models. This, in fact, appears to be the case of static, uniform--density
models of the interior metric of cosmic strings and neutron stars. We consider
the fourt... | [
{
"created": "Sat, 10 Aug 1996 22:50:06 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Campanelli",
"Manuela",
"",
"U. Bern"
],
[
"Lousto",
"Carlos O.",
"",
"U. Utah"
]
] | In this paper we show how quantum corrections, although perturbatively small, may play an important role in the analysis of the existence of some classical models. This, in fact, appears to be the case of static, uniform--density models of the interior metric of cosmic strings and neutron stars. We consider the fourth ... |
1506.05207 | Supratik Sarkar | Supratik Sarkar and Arijit Bhattacharyay | Effects of the Quantum Potential on lower dimensional models of analogue
gravity | 9 pages, 2 figures. arXiv admin note: substantial text overlap with
arXiv:1405.1865 | Phys. Rev. D 93, 024050 (2016) | 10.1103/PhysRevD.93.024050 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the issues related to the presence of the quantum potential term
in a BEC on the observable Analogue Gravity systems. We show that the quantum
potential term apparently gives rise to massive scalar excitations of length
scales of the order $\mathcal{O}(1/\xi)$ in the lower dimensional space. Since,
in 'ana... | [
{
"created": "Wed, 17 Jun 2015 05:10:45 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Dec 2015 19:53:49 GMT",
"version": "v2"
},
{
"created": "Mon, 7 Dec 2015 21:51:43 GMT",
"version": "v3"
},
{
"created": "Tue, 8 Aug 2017 11:28:37 GMT",
"version": "v4"
}
] | 2017-08-09 | [
[
"Sarkar",
"Supratik",
""
],
[
"Bhattacharyay",
"Arijit",
""
]
] | We address the issues related to the presence of the quantum potential term in a BEC on the observable Analogue Gravity systems. We show that the quantum potential term apparently gives rise to massive scalar excitations of length scales of the order $\mathcal{O}(1/\xi)$ in the lower dimensional space. Since, in 'analo... |
1911.09520 | Subenoy Chakraborty | Santu Mondal, Sourav Dutta and Subenoy Chakraborty | Variable $G$ and $\Lambda$ gravity theory and analytical Cosmological
Solutions using Noether symmetry approach | 10 pages, 6 figures | Gen.Rel.Grav. 51 (2019) no.9, 105 | 10.1007/s10714-019-2595-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work deals with scalar field cosmology in the framework of a
quantum gravity modified Einstein-Hilbert Lagrangian with variable $G$ and
$\Lambda$. Using Renormalization group, variable $G$ behaves as a minimally
coupled filed (not the scalar-tensor theory) and variable $\Lambda$ can be
interpreted as a po... | [
{
"created": "Wed, 20 Nov 2019 11:18:03 GMT",
"version": "v1"
}
] | 2019-11-22 | [
[
"Mondal",
"Santu",
""
],
[
"Dutta",
"Sourav",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The present work deals with scalar field cosmology in the framework of a quantum gravity modified Einstein-Hilbert Lagrangian with variable $G$ and $\Lambda$. Using Renormalization group, variable $G$ behaves as a minimally coupled filed (not the scalar-tensor theory) and variable $\Lambda$ can be interpreted as a pote... |
gr-qc/0604122 | Bojan Losic | B. Losic and W.G. Unruh | On leading order gravitational backreactions in de Sitter spacetime | 12 pages, no figures, typos corrected and some clarifying comments
added, version accepted by Phys. Rev. D | Phys.Rev. D74 (2006) 023511 | 10.1103/PhysRevD.74.023511 | null | gr-qc | null | Backreactions are considered in a de Sitter spacetime whose cosmological
constant is generated by the potential of scalar field. The leading order
gravitational effect of nonlinear matter fluctuations is analyzed and it is
found that the initial value problem for the perturbed Einstein equations
possesses linearizati... | [
{
"created": "Fri, 28 Apr 2006 03:05:01 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Jun 2006 17:56:35 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Losic",
"B.",
""
],
[
"Unruh",
"W. G.",
""
]
] | Backreactions are considered in a de Sitter spacetime whose cosmological constant is generated by the potential of scalar field. The leading order gravitational effect of nonlinear matter fluctuations is analyzed and it is found that the initial value problem for the perturbed Einstein equations possesses linearization... |
2406.08363 | Oliver Long | Oliver Long, Christopher Whittall, Leor Barack | Black hole scattering near the transition to plunge: Self-force and
resummation of post-Minkowskian theory | 15 pages, 9 figures; v2 minor typographic changes; v3 minor edits to
match published version | null | null | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Geodesic scattering of a test particle off a Schwarzschild black hole can be
parameterized by the speed-at-infinity $v$ and the impact parameter $b$, with a
"separatrix", $b=b_c(v)$, marking the threshold between scattering and plunge.
Near the separatrix, the scattering angle diverges as $\sim\log(b-b_c)$. The
self-... | [
{
"created": "Wed, 12 Jun 2024 16:13:13 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jun 2024 11:46:17 GMT",
"version": "v2"
},
{
"created": "Fri, 26 Jul 2024 15:15:50 GMT",
"version": "v3"
}
] | 2024-07-29 | [
[
"Long",
"Oliver",
""
],
[
"Whittall",
"Christopher",
""
],
[
"Barack",
"Leor",
""
]
] | Geodesic scattering of a test particle off a Schwarzschild black hole can be parameterized by the speed-at-infinity $v$ and the impact parameter $b$, with a "separatrix", $b=b_c(v)$, marking the threshold between scattering and plunge. Near the separatrix, the scattering angle diverges as $\sim\log(b-b_c)$. The self-fo... |
gr-qc/0508100 | Daniel Sudarsky | Alejandro Perez, Hanno Sahlmann, and Daniel Sudarsky | On the quantum origin of the seeds of cosmic structure | replacement with final version to appear in Classical and Quantum
Gravity | Class.Quant.Grav. 23 (2006) 2317-2354 | 10.1088/0264-9381/23/7/008 | null | gr-qc astro-ph hep-th quant-ph | null | The current understanding of the quantum origin of cosmic structure is
discussed critically. We point out that in the existing treatments a transition
from a symmetric quantum state to an (essentially classical) non-symmetric
state is implicitly assumed, but not specified or analyzed in any detail. In
facing the issu... | [
{
"created": "Wed, 24 Aug 2005 13:54:34 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Aug 2005 00:15:43 GMT",
"version": "v2"
},
{
"created": "Sat, 25 Feb 2006 19:55:57 GMT",
"version": "v3"
}
] | 2015-06-25 | [
[
"Perez",
"Alejandro",
""
],
[
"Sahlmann",
"Hanno",
""
],
[
"Sudarsky",
"Daniel",
""
]
] | The current understanding of the quantum origin of cosmic structure is discussed critically. We point out that in the existing treatments a transition from a symmetric quantum state to an (essentially classical) non-symmetric state is implicitly assumed, but not specified or analyzed in any detail. In facing the issue ... |
1501.04181 | Ward Struyve | Felipe Tovar Falciano, Nelson Pinto-Neto, Ward Struyve | Wheeler-DeWitt quantization and singularities | 10 pages, 3 figures, PDFLaTeX, revtex4 | Phys. Rev. D 91, 043524 (2015) | 10.1103/PhysRevD.91.043524 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a Bohmian approach to the Wheeler-DeWitt quantization of the
Friedmann-Lemaitre-Robertson-Walker model and investigate the question whether
or not there are singularities, in the sense that the universe reaches zero
volume. We find that for generic wave functions (i.e., non-classical wave
functions), ther... | [
{
"created": "Sat, 17 Jan 2015 09:32:54 GMT",
"version": "v1"
}
] | 2015-02-24 | [
[
"Falciano",
"Felipe Tovar",
""
],
[
"Pinto-Neto",
"Nelson",
""
],
[
"Struyve",
"Ward",
""
]
] | We consider a Bohmian approach to the Wheeler-DeWitt quantization of the Friedmann-Lemaitre-Robertson-Walker model and investigate the question whether or not there are singularities, in the sense that the universe reaches zero volume. We find that for generic wave functions (i.e., non-classical wave functions), there ... |
gr-qc/9509054 | James Hartle | Murray Gell-Mann (Santa Fe Institute, Los Alamos, University of New
Mexico) and James B. Hartle (University of California, Santa Barbara) | Strong Decoherence | 27pages, uses REVTEX 3.0, minor corrections | in Proceedings of the 4th Drexel Conference on Quantum
Non-Integrability: The Quantum-Classical Correspondence, ed by D.-H. Feng and
B.-L. Hu, International Press of Boston, Hong Kong (1998) | null | UCSBTH-95-28 | gr-qc hep-th quant-ph | null | We introduce a condition for the strong decoherence of a set of alternative
histories of a closed quantum-mechanical system such as the universe. The
condition applies, for a pure initial state, to sets of homogeneous histories
that are chains of projections, generally branch-dependent. Strong decoherence
implies the... | [
{
"created": "Thu, 28 Sep 1995 00:27:21 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Sep 1995 17:47:35 GMT",
"version": "v2"
},
{
"created": "Sun, 29 Oct 1995 21:48:18 GMT",
"version": "v3"
},
{
"created": "Thu, 23 Nov 1995 19:46:38 GMT",
"version": "v4"
}
] | 2008-02-03 | [
[
"Gell-Mann",
"Murray",
"",
"Santa Fe Institute, Los Alamos, University of New\n Mexico"
],
[
"Hartle",
"James B.",
"",
"University of California, Santa Barbara"
]
] | We introduce a condition for the strong decoherence of a set of alternative histories of a closed quantum-mechanical system such as the universe. The condition applies, for a pure initial state, to sets of homogeneous histories that are chains of projections, generally branch-dependent. Strong decoherence implies the c... |
2206.06516 | Jeferson de Oliveira | B. Cuadros-Melgar, R. D. B. Fontana, Jeferson de Oliveira | Gauss-Bonnet black holes in (2+1) dimensions: Perturbative aspects and
entropy features | 27 pages, 4 figures | Phys, Rev. D 106, 124007 (2022) | 10.1103/PhysRevD.106.124007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate some aspects of the $(2+1)$-dimensional Gauss-Bonnet black
hole proposed in [1][2]. The perturbations of scalar and massless spinorial
fields are studied suggesting the dynamical stability of the geometry. The
field evolution is analyzed calculating the quasinormal modes for different
parameters and ex... | [
{
"created": "Mon, 13 Jun 2022 23:02:18 GMT",
"version": "v1"
}
] | 2024-01-31 | [
[
"Cuadros-Melgar",
"B.",
""
],
[
"Fontana",
"R. D. B.",
""
],
[
"de Oliveira",
"Jeferson",
""
]
] | We investigate some aspects of the $(2+1)$-dimensional Gauss-Bonnet black hole proposed in [1][2]. The perturbations of scalar and massless spinorial fields are studied suggesting the dynamical stability of the geometry. The field evolution is analyzed calculating the quasinormal modes for different parameters and expl... |
0804.1410 | Tomohiro Harada | Masanori Kyo, Tomohiro Harada, Hideki Maeda | Asymptotically Friedmann self-similar scalar field solutions with
potential | accepted for publication in Physical Review D, minor correction,
typos corrected | Phys.Rev.D77:124036,2008 | 10.1103/PhysRevD.77.124036 | CECS-PHY-08/04 | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate self-similar solutions which are asymptotic to the Friedmann
universe at spatial infinity and contain a scalar field with potential. The
potential is required to be exponential by self-similarity. It is found that
there are two distinct one-parameter families of asymptotic solutions,one is
asymptotic t... | [
{
"created": "Wed, 9 Apr 2008 05:52:05 GMT",
"version": "v1"
},
{
"created": "Fri, 9 May 2008 02:29:55 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Jun 2008 05:07:46 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Kyo",
"Masanori",
""
],
[
"Harada",
"Tomohiro",
""
],
[
"Maeda",
"Hideki",
""
]
] | We investigate self-similar solutions which are asymptotic to the Friedmann universe at spatial infinity and contain a scalar field with potential. The potential is required to be exponential by self-similarity. It is found that there are two distinct one-parameter families of asymptotic solutions,one is asymptotic to ... |
2101.08289 | Boris Daszuta | Boris Daszuta, Francesco Zappa, William Cook, David Radice, Sebastiano
Bernuzzi, Viktoriya Morozova | GRAthena++: puncture evolutions on vertex-centered oct-tree AMR | null | null | 10.3847/1538-4365/ac157b | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Numerical relativity is central to the investigation of astrophysical sources
in the dynamical and strong-field gravity regime, such as binary black hole and
neutron star coalescences. Current challenges set by gravitational-wave and
multi-messenger astronomy call for highly performant and scalable codes on
modern ma... | [
{
"created": "Wed, 20 Jan 2021 19:08:08 GMT",
"version": "v1"
}
] | 2022-11-04 | [
[
"Daszuta",
"Boris",
""
],
[
"Zappa",
"Francesco",
""
],
[
"Cook",
"William",
""
],
[
"Radice",
"David",
""
],
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Morozova",
"Viktoriya",
""
]
] | Numerical relativity is central to the investigation of astrophysical sources in the dynamical and strong-field gravity regime, such as binary black hole and neutron star coalescences. Current challenges set by gravitational-wave and multi-messenger astronomy call for highly performant and scalable codes on modern mass... |
0708.0593 | Alain Ulacia Rey A.Ulacia Rey | A. Ulacia Rey, A. Perez Martinez and Roberto A. Sussman | Local dynamics and gravitational collapse of a self-gravitating
magnetized Fermi gas | 6 pages, 3 figures (accepted in General Relativity and Gravitation) | Gen.Rel.Grav.40:1499-1510,2008 | 10.1007/s10714-007-0542-z | null | gr-qc astro-ph hep-th | null | We use the Bianchi-I spacetime to study the local dynamics of a magnetized
self-gravitating Fermi gas. The set of Einstein-Maxwell field equations for
this gas becomes a dynamical system in a 4-dimensional phase space. We consider
a qualitative study and examine numeric solutions for the degenerate zero
temperature c... | [
{
"created": "Fri, 3 Aug 2007 23:15:42 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Nov 2007 00:03:22 GMT",
"version": "v2"
}
] | 2008-12-16 | [
[
"Rey",
"A. Ulacia",
""
],
[
"Martinez",
"A. Perez",
""
],
[
"Sussman",
"Roberto A.",
""
]
] | We use the Bianchi-I spacetime to study the local dynamics of a magnetized self-gravitating Fermi gas. The set of Einstein-Maxwell field equations for this gas becomes a dynamical system in a 4-dimensional phase space. We consider a qualitative study and examine numeric solutions for the degenerate zero temperature cas... |
1506.02479 | Philip D. Mannheim | Philip D. Mannheim | Comment on "Problems with Mannheim's conformal gravity program" | 4 pages, revtex4. Final version, to appear as a Comment in Phys. Rev.
D. Note change in title | null | 10.1103/PhysRevD.93.068501 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently in Phys. Rev. D 88, 027504 (2013) Yoon has suggested that there may
be problems for the non-relativistic limit of the conformal gravity theory.
Here we show that Yoon's results only hold because of the assumption that
gravitational sources can be treated the same way that they are treated in
standard Newton-... | [
{
"created": "Mon, 8 Jun 2015 13:17:48 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Mar 2016 20:32:39 GMT",
"version": "v2"
}
] | 2016-04-20 | [
[
"Mannheim",
"Philip D.",
""
]
] | Recently in Phys. Rev. D 88, 027504 (2013) Yoon has suggested that there may be problems for the non-relativistic limit of the conformal gravity theory. Here we show that Yoon's results only hold because of the assumption that gravitational sources can be treated the same way that they are treated in standard Newton-Ei... |
2001.11484 | Alexandru Dima | Alexandru Dima and Enrico Barausse | Numerical investigation of plasma-driven superradiant instabilities | 30 pages, 7 figures. Minor changes to match version accepted by CQG | Class. Quantum Grav. 37 175006 (2020) | 10.1088/1361-6382/ab9ce0 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Photons propagating in a plasma acquire an effective mass $\mu$, which is
given by the plasma frequency and which scales with the square root of the
plasma density. As noted previously by Conlon and Herdeiro, for electron number
densities $n_e\sim 10^{-3}$ cm$^{-3}$ (such as those measured in the
interstellar medium)... | [
{
"created": "Thu, 30 Jan 2020 18:07:33 GMT",
"version": "v1"
},
{
"created": "Wed, 22 Jul 2020 12:04:11 GMT",
"version": "v2"
}
] | 2020-08-07 | [
[
"Dima",
"Alexandru",
""
],
[
"Barausse",
"Enrico",
""
]
] | Photons propagating in a plasma acquire an effective mass $\mu$, which is given by the plasma frequency and which scales with the square root of the plasma density. As noted previously by Conlon and Herdeiro, for electron number densities $n_e\sim 10^{-3}$ cm$^{-3}$ (such as those measured in the interstellar medium) t... |
1001.2578 | Stephen R. Lau | Scott E. Field (1), Jan S. Hesthaven (1), Stephen R. Lau (2) ((1)
Brown, (2) New Mexico) | Persistent junk solutions in time-domain modeling of extreme mass ratio
binaries | Uses revtex4, 16 pages, 9 figures, 3 tables. Document reformatted and
modified based on referee's report. Commentary added which addresses the
possible presence of persistent junk solutions in other approaches for
solving master wave equations | Phys.Rev.D81:124030,2010 | 10.1103/PhysRevD.81.124030 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the context of metric perturbation theory for non-spinning black holes,
extreme mass ratio binary (EMRB) systems are described by distributionally
forced master wave equations. Numerical solution of a master wave equation as
an initial boundary value problem requires initial data. However, because the
correct init... | [
{
"created": "Thu, 14 Jan 2010 22:59:29 GMT",
"version": "v1"
},
{
"created": "Fri, 28 May 2010 16:44:22 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Field",
"Scott E.",
""
],
[
"Hesthaven",
"Jan S.",
""
],
[
"Lau",
"Stephen R.",
""
]
] | In the context of metric perturbation theory for non-spinning black holes, extreme mass ratio binary (EMRB) systems are described by distributionally forced master wave equations. Numerical solution of a master wave equation as an initial boundary value problem requires initial data. However, because the correct initia... |
gr-qc/9604015 | Int. Lab. HTSC and Sse | Sergiu I. Vacaru | Spinors in Higher Dimensional and Locally Anisotropic Spaces | 54 pages, Revtex, an extension of the paper published in J. Math.
Phys. 37 (1996), 508--523 | null | 10.1063/1.531406 | null | gr-qc dg-ga hep-th math.DG | null | The theory of spinors is developed for locally anisotropic (la) spaces, in
brief la-spaces, which in general are modeled as vector bundles provided with
nonlinear and distinguished connections and metric structures (such la-spaces
contain as particular cases the Lagrange, Finsler and, for trivial nonlinear
connection... | [
{
"created": "Fri, 5 Apr 1996 14:28:00 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Vacaru",
"Sergiu I.",
""
]
] | The theory of spinors is developed for locally anisotropic (la) spaces, in brief la-spaces, which in general are modeled as vector bundles provided with nonlinear and distinguished connections and metric structures (such la-spaces contain as particular cases the Lagrange, Finsler and, for trivial nonlinear connections,... |
1806.04086 | Sudan Hansraj | Sudan Hansraj | Spherically symmetric isothermal fluids in $f(R,T)$ gravity | null | null | 10.1140/epjc/s10052-018-6194-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the isothermal property in static fluid spheres within the
framework of the modified $f(R, T)$ theory of gravitation. The equation of
pressure isotropy of the standard Einstein theory is preserved however, the
energy density and pressure are expressed in terms of both gravitational
potentials. Invoking the... | [
{
"created": "Mon, 11 Jun 2018 16:15:37 GMT",
"version": "v1"
}
] | 2018-09-26 | [
[
"Hansraj",
"Sudan",
""
]
] | We analyze the isothermal property in static fluid spheres within the framework of the modified $f(R, T)$ theory of gravitation. The equation of pressure isotropy of the standard Einstein theory is preserved however, the energy density and pressure are expressed in terms of both gravitational potentials. Invoking the i... |
2101.06094 | Daniel Coumbe | Daniel Coumbe | Is Asymptotically Weyl-Invariant Gravity Viable? | 14 pages, 6 figures, 3 tables. References added. Conforms with
version published in PRD | Phys. Rev. D 103, 084050 (2021) | 10.1103/PhysRevD.103.084050 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We explore the cosmological viability of a theory of gravity defined by the
Lagrangian $f(\mathcal{R})=\mathcal{R}^{n\left(\mathcal{R}\right)}$ in the
Palatini formalism, where $n\left(\mathcal{R}\right)$ is a dimensionless
function of the Palatini scalar curvature $\mathcal{R}$ that interpolates
between general rela... | [
{
"created": "Fri, 15 Jan 2021 13:31:04 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Mar 2021 11:27:18 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Apr 2021 18:10:43 GMT",
"version": "v3"
}
] | 2021-05-05 | [
[
"Coumbe",
"Daniel",
""
]
] | We explore the cosmological viability of a theory of gravity defined by the Lagrangian $f(\mathcal{R})=\mathcal{R}^{n\left(\mathcal{R}\right)}$ in the Palatini formalism, where $n\left(\mathcal{R}\right)$ is a dimensionless function of the Palatini scalar curvature $\mathcal{R}$ that interpolates between general relati... |
2306.13218 | Mouhssine Koussour | N. Myrzakulov, M. Koussour, and Dhruba Jyoti Gogoi | A new $f(Q)$ cosmological model with $H(z)$ quadratic expansion | Physics of the Dark Universe published version | null | 10.1016/j.dark.2023.101268 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new $f(Q)$ cosmological model capable of reproducing late-time
acceleration, i.e. $f\left( Q\right) = \lambda_{0}\left( \lambda +Q\right)
^{n}$ by supporting certain parametrization of the Hubble parameter. By using
observational data from Hubble, Pantheon, and Baryonic Acoustic Oscillations
(BAO) datase... | [
{
"created": "Thu, 22 Jun 2023 21:39:51 GMT",
"version": "v1"
}
] | 2023-06-26 | [
[
"Myrzakulov",
"N.",
""
],
[
"Koussour",
"M.",
""
],
[
"Gogoi",
"Dhruba Jyoti",
""
]
] | We present a new $f(Q)$ cosmological model capable of reproducing late-time acceleration, i.e. $f\left( Q\right) = \lambda_{0}\left( \lambda +Q\right) ^{n}$ by supporting certain parametrization of the Hubble parameter. By using observational data from Hubble, Pantheon, and Baryonic Acoustic Oscillations (BAO) dataset,... |
1308.5402 | Shabbir Ghulam | Ghulam Shabbir, M. Ramzan and Suhail Khan | Classification of non conformally flat cylindrically symmetric non
static space-times according to their proper conformal motions | 9 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we considered the most general form of non conformally flat
cylindrically symmetric non-static space-times to study proper conformal
motions using direct integration technique. We have shown that very special
classes for cylindrically symmetric space-times admit proper conformal motions.
This classifica... | [
{
"created": "Sun, 25 Aug 2013 12:49:19 GMT",
"version": "v1"
}
] | 2013-08-27 | [
[
"Shabbir",
"Ghulam",
""
],
[
"Ramzan",
"M.",
""
],
[
"Khan",
"Suhail",
""
]
] | In this paper we considered the most general form of non conformally flat cylindrically symmetric non-static space-times to study proper conformal motions using direct integration technique. We have shown that very special classes for cylindrically symmetric space-times admit proper conformal motions. This classificati... |
1105.6328 | Alexandre Baranov | A.M.Baranov and R.V.Bikmurzin | Exact static solutions for fluid gravitating balls in homogeneous
coordinates | 3 pages, 2 figures. Proceedings of the International Conference on
Gravitation, Cosmology, Astrophysics and Nonstationary Gas Dynamics,
Delicated to Prof. K.P.Staniukovich's 90th birthday, Moscow, 2-6 March 2006 | Gravition & Cosmology, Vol.12 (2006), No.2-3 (46-47), pp.103-105 | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two new classes of exact interior static solutions of the Einstein equations
in homogeneous coordinates for a gravitating ball filled by a Pascal perfect
fluid are obtained. Schwarzschild's interior solution of is a special case of
these solutions.
| [
{
"created": "Tue, 31 May 2011 16:05:14 GMT",
"version": "v1"
}
] | 2011-06-01 | [
[
"Baranov",
"A. M.",
""
],
[
"Bikmurzin",
"R. V.",
""
]
] | Two new classes of exact interior static solutions of the Einstein equations in homogeneous coordinates for a gravitating ball filled by a Pascal perfect fluid are obtained. Schwarzschild's interior solution of is a special case of these solutions. |
2201.00226 | James B. Hartle | James B. Hartle | Simplicial Quantum Gravity | 14 pages, revtex4, content unchanged from ist version but typos and
other small mistakes fixed | null | null | null | gr-qc hep-th physics.hist-ph quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Simplicial approximation and the ideas associated with the Regge
calculus.provide a concrete way of implementing a sum over histories
formulation ofquantum gravity. A four-dimensional simplicial geometry is made
up of flat four-simplices joined together.A sum over simplicial geometries is a
sum over thedifferent ways... | [
{
"created": "Sat, 1 Jan 2022 18:20:07 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Jan 2022 22:07:04 GMT",
"version": "v2"
}
] | 2022-01-27 | [
[
"Hartle",
"James B.",
""
]
] | Simplicial approximation and the ideas associated with the Regge calculus.provide a concrete way of implementing a sum over histories formulation ofquantum gravity. A four-dimensional simplicial geometry is made up of flat four-simplices joined together.A sum over simplicial geometries is a sum over thedifferent ways t... |
2207.10410 | Harsh Narola | Harsh Narola, Soumen Roy, Anand S. Sengupta | Beyond general relativity: designing a template-based search for exotic
gravitational wave signals | null | null | 10.1103/PhysRevD.107.024017 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Accurate waveform models describing the complete evolution of compact
binaries are crucial for the maximum likelihood detection framework, testing
the predictions of General Relativity (GR) and investigating the possibility of
an alternative theory of gravity. Deviations from GR could manifest in subtle
variations of... | [
{
"created": "Thu, 21 Jul 2022 11:01:20 GMT",
"version": "v1"
}
] | 2023-02-01 | [
[
"Narola",
"Harsh",
""
],
[
"Roy",
"Soumen",
""
],
[
"Sengupta",
"Anand S.",
""
]
] | Accurate waveform models describing the complete evolution of compact binaries are crucial for the maximum likelihood detection framework, testing the predictions of General Relativity (GR) and investigating the possibility of an alternative theory of gravity. Deviations from GR could manifest in subtle variations of t... |
1509.01452 | Chayan Ranjit | Chayan Ranjit, Prabir Rudra | Study of Some Cosmological Parameters for Interacting New Holographic
Dark Energy Model in f(T) Gravity | 12 pages, 12 figures, Accepted in International Journal of Modern
Physics D | null | 10.1142/S0218271816500085 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work is based on the idea of an interacting framework of new
holographic dark energy with cold dark matter in the background of $f(T)$
gravity. Here, we have considered the flat modified Friedmann universe for
$f(T)$ gravity which is filled with new Holographic dark energy and dark
matter. We have derived... | [
{
"created": "Thu, 3 Sep 2015 15:39:44 GMT",
"version": "v1"
}
] | 2016-02-17 | [
[
"Ranjit",
"Chayan",
""
],
[
"Rudra",
"Prabir",
""
]
] | The present work is based on the idea of an interacting framework of new holographic dark energy with cold dark matter in the background of $f(T)$ gravity. Here, we have considered the flat modified Friedmann universe for $f(T)$ gravity which is filled with new Holographic dark energy and dark matter. We have derived s... |
1609.00700 | Mariam Bouhmadi-Lopez | Mariam Bouhmadi-L\'opez, Che-Yu Chen | Towards the Quantization of Eddington-inspired-Born-Infeld Theory | 26 pages, 1 figure. Discussion expanded and further mathematical and
physical details provided. Version accepted in JCAP | JCAP 11 (2016) 023 | 10.1088/1475-7516/2016/11/023 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quantum effects close to the classical big rip singularity within the
Eddington-inspired-Born-Infeld theory (EiBI) are investigated through quantum
geometrodynamics. It is the first time that this approach is applied to a
modified theory constructed upon Palatini formalism. The Wheeler-DeWitt (WDW)
equation is ob... | [
{
"created": "Fri, 2 Sep 2016 19:05:48 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Sep 2016 13:54:35 GMT",
"version": "v2"
},
{
"created": "Fri, 21 Oct 2016 12:56:30 GMT",
"version": "v3"
}
] | 2016-11-10 | [
[
"Bouhmadi-López",
"Mariam",
""
],
[
"Chen",
"Che-Yu",
""
]
] | The quantum effects close to the classical big rip singularity within the Eddington-inspired-Born-Infeld theory (EiBI) are investigated through quantum geometrodynamics. It is the first time that this approach is applied to a modified theory constructed upon Palatini formalism. The Wheeler-DeWitt (WDW) equation is obta... |
2312.01636 | Tousif Islam | Tousif Islam, Scott E. Field, Gaurav Khanna | Comparing numerical relativity and perturbation theory waveforms for a
non-spinning equal-mass binary | Published in a themed issue in honor of Prof. Jorge Pullin on his
60th anniversary; Universe 2024, 10(1), 25 | null | 10.3390/universe10010025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Past studies have empirically demonstrated a surprising agreement between
gravitational waveforms computed using adiabatic-driven-inspiral point-particle
black hole perturbation theory (ppBHPT) and numerical relativity (NR) following
a straightforward calibration step, sometimes referred to as $\alpha$-$\beta$
scalin... | [
{
"created": "Mon, 4 Dec 2023 05:37:04 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Feb 2024 00:17:36 GMT",
"version": "v2"
}
] | 2024-02-06 | [
[
"Islam",
"Tousif",
""
],
[
"Field",
"Scott E.",
""
],
[
"Khanna",
"Gaurav",
""
]
] | Past studies have empirically demonstrated a surprising agreement between gravitational waveforms computed using adiabatic-driven-inspiral point-particle black hole perturbation theory (ppBHPT) and numerical relativity (NR) following a straightforward calibration step, sometimes referred to as $\alpha$-$\beta$ scaling.... |
1612.09077 | Shoichiro Miyashita | Yosuke Misonoh, Mitsuhiro Fukushima, Shoichiro Miyashita | Stability of Singularity-free Cosmological Solutions in
Ho\v{r}ava-Lifshitz Gravity | 22 pages, 8 figures ; v3 : some results modified | Phys. Rev. D 95, 044044 (2017) | 10.1103/PhysRevD.95.044044 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study stability of singularity-free cosmological solutions with positive
cosmological constant based on projectable Ho\v{r}ava-Lifshitz (HL) theory. In
HL theory, the isotropic and homogeneous cosmological solutions with bounce can
be realized if spacial curvature is non-zero. By performing perturbation
analysis a... | [
{
"created": "Thu, 29 Dec 2016 08:54:12 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Jan 2017 09:17:39 GMT",
"version": "v2"
},
{
"created": "Sun, 22 Jan 2017 10:33:56 GMT",
"version": "v3"
}
] | 2017-03-08 | [
[
"Misonoh",
"Yosuke",
""
],
[
"Fukushima",
"Mitsuhiro",
""
],
[
"Miyashita",
"Shoichiro",
""
]
] | We study stability of singularity-free cosmological solutions with positive cosmological constant based on projectable Ho\v{r}ava-Lifshitz (HL) theory. In HL theory, the isotropic and homogeneous cosmological solutions with bounce can be realized if spacial curvature is non-zero. By performing perturbation analysis aro... |
2201.10875 | Jaros{\l}aw Kopi\'nski | Jaros{\l}aw Kopi\'nski, Juan A. Valiente Kroon | Bach equation and the matching of spacetimes in conformal cyclic
cosmology models | 10 pages; updated to match the published version | Phys. Rev. D 106, 084034 2022 | 10.1103/PhysRevD.106.084034 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider the problem of matching two spacetimes, the previous and present
aeons, in the Conformal Cyclic Cosmology model. The common boundary between
them inherits two sets of constraints -- one for each solution of the Einstein
field equations extended to the conformal boundaries. The previous aeon is
assumed to ... | [
{
"created": "Wed, 26 Jan 2022 11:21:38 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Oct 2022 15:14:04 GMT",
"version": "v2"
}
] | 2023-02-28 | [
[
"Kopiński",
"Jarosław",
""
],
[
"Kroon",
"Juan A. Valiente",
""
]
] | We consider the problem of matching two spacetimes, the previous and present aeons, in the Conformal Cyclic Cosmology model. The common boundary between them inherits two sets of constraints -- one for each solution of the Einstein field equations extended to the conformal boundaries. The previous aeon is assumed to be... |
1607.05318 | Farhad Darabi | M. R. Setare, F. Felegary, F. Darabi | Evolution of spherical over-densities in tachyon scalar field model | 14 pages, 15 figures, revision | Physics Letters B, 772, 70 (2017) | 10.1016/j.physletb.2017.06.039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the tachyon scalar field model in flat FRW cosmology with the
particular potential $\phi^{-2}$ and the scale factor behavior $a(t)=t^n$. We
consider the spherical collapse model and investigate the effects of the
tachyon scalar field on the structure formation in flat FRW universe. We
calculate $\delta_{c}(z... | [
{
"created": "Mon, 18 Jul 2016 20:41:54 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Oct 2016 18:33:26 GMT",
"version": "v2"
},
{
"created": "Wed, 28 Jun 2017 21:41:03 GMT",
"version": "v3"
}
] | 2017-08-23 | [
[
"Setare",
"M. R.",
""
],
[
"Felegary",
"F.",
""
],
[
"Darabi",
"F.",
""
]
] | We study the tachyon scalar field model in flat FRW cosmology with the particular potential $\phi^{-2}$ and the scale factor behavior $a(t)=t^n$. We consider the spherical collapse model and investigate the effects of the tachyon scalar field on the structure formation in flat FRW universe. We calculate $\delta_{c}(z_{... |
1811.08551 | P. A. Gonzalez | P. A. Gonz\'alez, Marco Olivares, Yerko V\'asquez, Joel Saavedra and
Ali \"Ovg\"un | Motion and collision of particles near DST Black holes | 21 pages and 10 figures. New version | Eur. Phys. J. C (2019) 79: 528 | 10.1140/epjc/s10052-019-7043-6 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider Deser-Sarioglu-Tekin (DST) black holes as background and we study
such the motion of massive particles as the collision of two spinning particles
in the vicinity of its horizon. New kinds of orbits are allowed for small
deviations of General Relativity, but the behavior of the collision is similar
to the ... | [
{
"created": "Wed, 21 Nov 2018 02:14:47 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Mar 2019 21:57:59 GMT",
"version": "v2"
}
] | 2019-06-24 | [
[
"González",
"P. A.",
""
],
[
"Olivares",
"Marco",
""
],
[
"Vásquez",
"Yerko",
""
],
[
"Saavedra",
"Joel",
""
],
[
"Övgün",
"Ali",
""
]
] | We consider Deser-Sarioglu-Tekin (DST) black holes as background and we study such the motion of massive particles as the collision of two spinning particles in the vicinity of its horizon. New kinds of orbits are allowed for small deviations of General Relativity, but the behavior of the collision is similar to the on... |
gr-qc/0607012 | Robert Brout | Robert Brout | The Causet Mechanism for the Creation of Energy | Dedicated to Rafael Sorkin, to appear in his 60th birthday
Festschrift | null | null | null | gr-qc | null | Sorkin's causet mechanism is generalized to include energy exchange between
causet elements and conventional vacuum fluctuations to the inflationary epoch.
In this, the dark energy of the adiabatic era is the fluctuating remnant of
inflation. The mechanism is also applicable to black hole evaporation.
| [
{
"created": "Tue, 4 Jul 2006 19:48:06 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Aug 2006 16:11:29 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Aug 2006 18:55:21 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Brout",
"Robert",
""
]
] | Sorkin's causet mechanism is generalized to include energy exchange between causet elements and conventional vacuum fluctuations to the inflationary epoch. In this, the dark energy of the adiabatic era is the fluctuating remnant of inflation. The mechanism is also applicable to black hole evaporation. |
1506.07119 | Lunchakorn Tannukij | Sushant G. Ghosh, Lunchakorn Tannukij, Pitayuth Wongjun | A class of black holes in dRGT massive gravity and their thermodynamical
properties | 29 pages, 20 figures, typos fixed | Eur. Phys. J. C 76, no. 3, 119 (2016) | 10.1140/epjc/s10052-016-3943-x | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present exact spherical black hole solutions in de Rham, Gabadadze and
Tolley (dRGT) massive gravity for a generic choice of the parameters in the
theory, and also discuss the thermodynamical and phase structure of the black
hole in both the grand canonical and canonical ensembles (for charged case). It
turns out ... | [
{
"created": "Thu, 18 Jun 2015 11:26:51 GMT",
"version": "v1"
},
{
"created": "Fri, 20 Nov 2015 06:43:39 GMT",
"version": "v2"
},
{
"created": "Tue, 15 Mar 2016 07:46:14 GMT",
"version": "v3"
}
] | 2016-03-16 | [
[
"Ghosh",
"Sushant G.",
""
],
[
"Tannukij",
"Lunchakorn",
""
],
[
"Wongjun",
"Pitayuth",
""
]
] | We present exact spherical black hole solutions in de Rham, Gabadadze and Tolley (dRGT) massive gravity for a generic choice of the parameters in the theory, and also discuss the thermodynamical and phase structure of the black hole in both the grand canonical and canonical ensembles (for charged case). It turns out th... |
1405.7023 | Sam Young | Sam Young, Christian T. Byrnes, Misao Sasaki | Calculating the mass spectrum of primordial black holes | 16 pages, 7 figures. Version 2: updated to match published version
and include journal reference. Version 3 and 4: minor corrections,
conclusions unchanged | JCAP 1407 (2014) 045 | 10.1088/1475-7516/2014/07/045 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reinspect the calculation for the mass fraction of primordial black holes
(PBHs) which are formed from primordial perturbations, finding that performing
the calculation using the comoving curvature perturbation $\mathcal{R}_{c}$ in
the standard way vastly overestimates the number of PBHs, by many orders of
magnitu... | [
{
"created": "Tue, 27 May 2014 19:23:15 GMT",
"version": "v1"
},
{
"created": "Mon, 1 Sep 2014 13:54:09 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Dec 2014 15:08:15 GMT",
"version": "v3"
},
{
"created": "Wed, 4 Mar 2015 12:15:39 GMT",
"version": "v4"
}
] | 2015-03-05 | [
[
"Young",
"Sam",
""
],
[
"Byrnes",
"Christian T.",
""
],
[
"Sasaki",
"Misao",
""
]
] | We reinspect the calculation for the mass fraction of primordial black holes (PBHs) which are formed from primordial perturbations, finding that performing the calculation using the comoving curvature perturbation $\mathcal{R}_{c}$ in the standard way vastly overestimates the number of PBHs, by many orders of magnitude... |
1011.4444 | Ian D. Lawrie | Ian D. Lawrie | Time evolution in quantum cosmology | 21 pages, no figures; minor revisions and added references; matches
version in Phys Rev D | Phys.Rev.D83:043503,2011 | 10.1103/PhysRevD.83.043503 | null | gr-qc hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A commonly adopted relational account of time evolution in
generally-covariant systems, and more specifically in quantum cosmology, is
argued to be unsatisfactory, insofar as it describes evolution relative to
observed readings of a clock that does not exist as a bona fide observable
object. A modified strategy is pr... | [
{
"created": "Fri, 19 Nov 2010 15:07:32 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Mar 2011 11:56:54 GMT",
"version": "v2"
}
] | 2011-03-10 | [
[
"Lawrie",
"Ian D.",
""
]
] | A commonly adopted relational account of time evolution in generally-covariant systems, and more specifically in quantum cosmology, is argued to be unsatisfactory, insofar as it describes evolution relative to observed readings of a clock that does not exist as a bona fide observable object. A modified strategy is prop... |
1503.01221 | Jia-Hui Huang | Jia-Hui Huang, Zhan-Feng Mai | Superradiantly stable non-extremal Reissner-Nordstrom black holes | null | null | 10.1140/epjc/s10052-016-4157-y | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | The superradiant stability is investigated for non-extremal
Reissner-Nordstrom black hole. We use an algebraic method to demonstrate that
all non-extremal Reissner-Nordstrom black holes are superradiantly stable
against a charged massive scalar perturbation. This improves the results
obtained before for non-extremal ... | [
{
"created": "Wed, 4 Mar 2015 05:05:40 GMT",
"version": "v1"
}
] | 2016-06-14 | [
[
"Huang",
"Jia-Hui",
""
],
[
"Mai",
"Zhan-Feng",
""
]
] | The superradiant stability is investigated for non-extremal Reissner-Nordstrom black hole. We use an algebraic method to demonstrate that all non-extremal Reissner-Nordstrom black holes are superradiantly stable against a charged massive scalar perturbation. This improves the results obtained before for non-extremal Re... |
gr-qc/0311070 | Sivasubramanian Somu | S. Sivasubramanian, A. Widom, Y.N. Srivastava | Gravitational Waves and the Sagnac Effect | LaTeX format 1 *.eps figure | null | null | null | gr-qc | null | We consider light waves propagating clockwise and other light waves
propagating counterclockwise around a closed path in a plane (theoretically
with the help of stationary mirrors). The time difference between the two light
propagating path orientations constitutes the Sagnac effect. The general
relativistic expressi... | [
{
"created": "Fri, 21 Nov 2003 03:15:37 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sivasubramanian",
"S.",
""
],
[
"Widom",
"A.",
""
],
[
"Srivastava",
"Y. N.",
""
]
] | We consider light waves propagating clockwise and other light waves propagating counterclockwise around a closed path in a plane (theoretically with the help of stationary mirrors). The time difference between the two light propagating path orientations constitutes the Sagnac effect. The general relativistic expression... |
2310.13150 | Pablo Pais | Nick E. Mavromatos, Pablo Pais, Alfredo Iorio | Torsion at different scales: from materials to the Universe | 48 pages, 9 figures incorporated. Invited review, the version matches
the published version in the journal Universe | Universe 2023, 9(12), 516 | 10.3390/universe9120516 | KCL-PH-TH/2023-54 | gr-qc cond-mat.mtrl-sci hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The concept of torsion in geometry, although known for a long time, has not
gained considerable attention by the physics community until relatively
recently, due to its diverse and potentially important applications to a
plethora of contexts of physical interest. These range from novel materials,
such as graphene and... | [
{
"created": "Thu, 19 Oct 2023 20:47:11 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2023 18:29:12 GMT",
"version": "v2"
},
{
"created": "Sun, 31 Dec 2023 19:00:44 GMT",
"version": "v3"
}
] | 2024-01-02 | [
[
"Mavromatos",
"Nick E.",
""
],
[
"Pais",
"Pablo",
""
],
[
"Iorio",
"Alfredo",
""
]
] | The concept of torsion in geometry, although known for a long time, has not gained considerable attention by the physics community until relatively recently, due to its diverse and potentially important applications to a plethora of contexts of physical interest. These range from novel materials, such as graphene and g... |
gr-qc/0204022 | Matt Visser | Matt Visser (Washington University in Saint Louis) | The quantum physics of chronology protection | CUP style: uses cmmp.cls; 18 pages; contribution to "The future of
theoretical physics and cosmology", conference in honour of Professor Stephen
Hawking on the occasion of his 60'th birthday. V2: Some references added | null | null | null | gr-qc hep-th | null | This is a brief survey of the current status of Stephen Hawking's
``chronology protection conjecture''. That is: ``Why does nature abhor a time
machine?'' I'll discuss a few examples of spacetimes containing ``time
machines'' (closed causal curves), the sorts of peculiarities that arise, and
the reactions of the phys... | [
{
"created": "Fri, 5 Apr 2002 02:20:47 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Apr 2002 19:49:54 GMT",
"version": "v2"
}
] | 2016-08-31 | [
[
"Visser",
"Matt",
"",
"Washington University in Saint Louis"
]
] | This is a brief survey of the current status of Stephen Hawking's ``chronology protection conjecture''. That is: ``Why does nature abhor a time machine?'' I'll discuss a few examples of spacetimes containing ``time machines'' (closed causal curves), the sorts of peculiarities that arise, and the reactions of the physic... |
2104.00754 | Daniel Flores | D. Flores-Alfonso, C. S. Lopez-Monsalvo, M. Maceda | Thurston Geometries in Three-Dimensional New Massive Gravity | null | Phys. Rev. Lett. 127, 061102 (2021) | 10.1103/PhysRevLett.127.061102 | null | gr-qc hep-th math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We show that the three-dimensional Thurston geometries are vacuum solutions
to the 3D new massive gravity equations of motion. We analyze their Lorentzian
counterparts as well.
| [
{
"created": "Thu, 1 Apr 2021 20:25:25 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jun 2021 01:23:34 GMT",
"version": "v2"
},
{
"created": "Mon, 9 Aug 2021 01:58:37 GMT",
"version": "v3"
}
] | 2021-08-10 | [
[
"Flores-Alfonso",
"D.",
""
],
[
"Lopez-Monsalvo",
"C. S.",
""
],
[
"Maceda",
"M.",
""
]
] | We show that the three-dimensional Thurston geometries are vacuum solutions to the 3D new massive gravity equations of motion. We analyze their Lorentzian counterparts as well. |
2401.08885 | Messias De Brito Cruz | M. B. Cruz, R. M. P. Neves and Celio R. Muniz | Traversable Wormholes from Loop Quantum Gravity | 20 pages and 19 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This study introduces and investigates Lorentzian traversable wormhole
solutions rooted in Loop Quantum Gravity (LQG). The static and spherically
symmetric solutions to be examined stem from the energy density sourcing
self-dual regular black holes discovered by L. Modesto, relying on the
parameters associated with L... | [
{
"created": "Tue, 16 Jan 2024 23:44:17 GMT",
"version": "v1"
}
] | 2024-01-18 | [
[
"Cruz",
"M. B.",
""
],
[
"Neves",
"R. M. P.",
""
],
[
"Muniz",
"Celio R.",
""
]
] | This study introduces and investigates Lorentzian traversable wormhole solutions rooted in Loop Quantum Gravity (LQG). The static and spherically symmetric solutions to be examined stem from the energy density sourcing self-dual regular black holes discovered by L. Modesto, relying on the parameters associated with LQG... |
gr-qc/9404046 | Robert Mann | M.S. Delgaty and R.B. Mann | Traversable Wormholes in (2+1) and (3+1) Dimensions with a Cosmological
Constant | 19 pgs. WATPHYS TH-93/06 | Int.J.Mod.Phys. D4 (1995) 231-246 | 10.1142/S021827189500017X | null | gr-qc | null | Macroscopic traversable wormhole solutions to Einstein's field equations in
$(2+1)$ and $(3+1)$ dimensions with a cosmological constant are investigated.
Ensuring traversability severely constrains the material used to generate the
wormhole's spacetime curvature. Although the presence of a cosmological
constant modif... | [
{
"created": "Mon, 25 Apr 1994 19:22:30 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Delgaty",
"M. S.",
""
],
[
"Mann",
"R. B.",
""
]
] | Macroscopic traversable wormhole solutions to Einstein's field equations in $(2+1)$ and $(3+1)$ dimensions with a cosmological constant are investigated. Ensuring traversability severely constrains the material used to generate the wormhole's spacetime curvature. Although the presence of a cosmological constant modifie... |
1805.05684 | Rituparno Goswami | Abbas Sherif, Rituparno Goswami, Sunil D Maharaj | Geometrical properties of trapped surfaces and apparent horizons | 16 pages, Revtex4 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we perform a detailed investigation on the various geometrical
properties of trapped surfaces and the boundaries of trapped region in general
relativity. This treatment extends earlier work on LRS II spacetimes to a
general 4 dimensional spacetime manifold. Using a semi-tetrad covariant
formalism, that... | [
{
"created": "Tue, 15 May 2018 10:15:43 GMT",
"version": "v1"
}
] | 2018-05-16 | [
[
"Sherif",
"Abbas",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Maharaj",
"Sunil D",
""
]
] | In this paper, we perform a detailed investigation on the various geometrical properties of trapped surfaces and the boundaries of trapped region in general relativity. This treatment extends earlier work on LRS II spacetimes to a general 4 dimensional spacetime manifold. Using a semi-tetrad covariant formalism, that p... |
0707.2390 | Mariam Bouhmadi-Lopez | Mariam Bouhmadi-Lopez, Pedro F. Gonzalez-Diaz, Prado Martin-Moruno | On the generalised Chaplygin gas: worse than a big rip or quieter than a
sudden singularity? | 19 pages, 6 figures. Discussion expanded and references added.
Version to appear in the International Journal of Modern Physics D | Int.J.Mod.Phys.D17:2269-2290,2008 | 10.1142/S0218271808013856 | null | gr-qc | null | Although it has been believed that the models with generalised Chaplygin gas
do not contain singularities, in a previous work we have studied how a big
freeze could take place in some kinds of phantom generalised Chaplygin gas. In
the present work, we study some types of generalised Chaplygin gas in order to
show how... | [
{
"created": "Mon, 16 Jul 2007 20:28:21 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Mar 2008 15:51:10 GMT",
"version": "v2"
}
] | 2009-02-11 | [
[
"Bouhmadi-Lopez",
"Mariam",
""
],
[
"Gonzalez-Diaz",
"Pedro F.",
""
],
[
"Martin-Moruno",
"Prado",
""
]
] | Although it has been believed that the models with generalised Chaplygin gas do not contain singularities, in a previous work we have studied how a big freeze could take place in some kinds of phantom generalised Chaplygin gas. In the present work, we study some types of generalised Chaplygin gas in order to show how d... |
1803.06431 | Christopher Pilot | Christopher Pilot | Is Quintessence an Indication of a Time-Varying Gravitational Constant? | null | JHEPGC (Journal of High Energy Physics, Gravitation and Cosmology)
Vol 5 No 1 (2019) | 10.4236/jhepgc.2019.51003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A model is presented where the quintessence parameter, w, is related to a
time-varying gravitational constant. Assuming a present value of w equals -.98,
we predict a current variation of G dot/G = -.06 H0. H0 is Hubbles parameter, G
is Newtons constant and G dot is the derivative of G with respect to time.
Thus, G h... | [
{
"created": "Sat, 17 Mar 2018 00:19:41 GMT",
"version": "v1"
}
] | 2020-08-03 | [
[
"Pilot",
"Christopher",
""
]
] | A model is presented where the quintessence parameter, w, is related to a time-varying gravitational constant. Assuming a present value of w equals -.98, we predict a current variation of G dot/G = -.06 H0. H0 is Hubbles parameter, G is Newtons constant and G dot is the derivative of G with respect to time. Thus, G has... |
1101.4797 | Rong-Jia Yang | Rong-Jia Yang, Zong-Hong Zhu, and Fengquan Wu | Spatial Ricci scalar dark energy model | 9 pages, 7 figures | Int.J.Mod.Phys.A 26 (2011) 317-329 | 10.1142/S0217751X11051263 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Inspired by holographic principle, we suggest that the density of dark energy
is proportional to the spatial Ricci scalar curvature (SRDE). Such model is
phenomenologically viable. The best fit values of its parameters at 68%
confidence level are found to be: $\Omega_{\rm m0}=0.259\pm0.016$ and
$\alpha=0.261\pm0.0122... | [
{
"created": "Tue, 25 Jan 2011 12:54:38 GMT",
"version": "v1"
},
{
"created": "Tue, 27 May 2014 14:03:32 GMT",
"version": "v2"
}
] | 2014-05-28 | [
[
"Yang",
"Rong-Jia",
""
],
[
"Zhu",
"Zong-Hong",
""
],
[
"Wu",
"Fengquan",
""
]
] | Inspired by holographic principle, we suggest that the density of dark energy is proportional to the spatial Ricci scalar curvature (SRDE). Such model is phenomenologically viable. The best fit values of its parameters at 68% confidence level are found to be: $\Omega_{\rm m0}=0.259\pm0.016$ and $\alpha=0.261\pm0.0122$,... |
1907.12866 | Bibekananda Nayak Dr. | Bibekananda Nayak | Interacting Holographic Dark Energy, the Present Accelerated Expansion
and Black Holes | 11 pages, 6 figures | Gravitation and Cosmology 26 (2020) 273-280 | 10.1134/S020228932003010X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of the universe by assuming an integrated model, which
involves interacting dark energy and holographic principle with Hubble scale as
IR cutoff. First we determined the interaction rate at which matter is
converting to dark energy. In the next step, we evaluated the equation of state
parameter... | [
{
"created": "Tue, 30 Jul 2019 12:51:32 GMT",
"version": "v1"
},
{
"created": "Tue, 26 Nov 2019 12:37:15 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Mar 2020 10:04:33 GMT",
"version": "v3"
},
{
"created": "Sun, 6 Sep 2020 10:56:18 GMT",
"version": "v4"
}
] | 2020-10-14 | [
[
"Nayak",
"Bibekananda",
""
]
] | We study the evolution of the universe by assuming an integrated model, which involves interacting dark energy and holographic principle with Hubble scale as IR cutoff. First we determined the interaction rate at which matter is converting to dark energy. In the next step, we evaluated the equation of state parameter w... |
2010.09966 | Giovanni Tricella | Stefano Liberati, Giovanni Tricella, Andrea Trombettoni | Back-reaction in canonical analogue black holes | This article belongs to the Special Issue Analogue Gravitational
Dynamics | Applied Sciences 2020, 10(24), 8868 | 10.3390/app10248868 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the back-reaction associated with Hawking evaporation of an acoustic
canonical analogue black hole in a Bose-Einstein condensate. We show that the
emission of Hawking radiation induces a local back-reaction on the condensate,
perturbing it in the near-horizon region, and a global back-reaction in the
density... | [
{
"created": "Tue, 20 Oct 2020 02:29:09 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Dec 2020 16:07:23 GMT",
"version": "v2"
}
] | 2020-12-14 | [
[
"Liberati",
"Stefano",
""
],
[
"Tricella",
"Giovanni",
""
],
[
"Trombettoni",
"Andrea",
""
]
] | We study the back-reaction associated with Hawking evaporation of an acoustic canonical analogue black hole in a Bose-Einstein condensate. We show that the emission of Hawking radiation induces a local back-reaction on the condensate, perturbing it in the near-horizon region, and a global back-reaction in the density d... |
1804.07440 | Hwa-Tung Nieh | H.T. Nieh | Torsional Topological Invariants | null | Phys. Rev. D 98, 104045 (2018) | 10.1103/PhysRevD.98.104045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Making use of the SO(3,1) Lorentz algebra, we derive in this paper two series
of Gauss-Bonnet type identities involving torsion, one being of the Pontryagin
type and the other of the Euler type. Two of the six identities involve only
torsional tensorial entities and are purely torsional topological invariants.
| [
{
"created": "Fri, 20 Apr 2018 03:25:36 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Nov 2018 09:40:01 GMT",
"version": "v2"
}
] | 2018-12-05 | [
[
"Nieh",
"H. T.",
""
]
] | Making use of the SO(3,1) Lorentz algebra, we derive in this paper two series of Gauss-Bonnet type identities involving torsion, one being of the Pontryagin type and the other of the Euler type. Two of the six identities involve only torsional tensorial entities and are purely torsional topological invariants. |
1811.09571 | Xavier Lachaume | Xavier Lachaume | On the number of terms in the Lovelock products | 5 pages | Eur. Phys. J. C (2019) 79: 266 | 10.1140/epjc/s10052-019-6776-6 | null | gr-qc math-ph math.MP math.RT | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this short note we wonder about the explicit expression of the expanding
of the $p$-th Lovelock product. We use the 1990's works of S. A. Fulling et al.
on the symmetries of the Riemann tensor, and we show that the number of
independent scalars appearing in this expanding is equal to the number of Young
diagrams w... | [
{
"created": "Fri, 23 Nov 2018 17:27:51 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Mar 2019 14:58:18 GMT",
"version": "v2"
}
] | 2019-03-25 | [
[
"Lachaume",
"Xavier",
""
]
] | In this short note we wonder about the explicit expression of the expanding of the $p$-th Lovelock product. We use the 1990's works of S. A. Fulling et al. on the symmetries of the Riemann tensor, and we show that the number of independent scalars appearing in this expanding is equal to the number of Young diagrams wit... |
1305.2599 | Donald Neville | Donald E. Neville | Plane wave holonomies in loop quantum gravity II: sine wave solution | 56 pages, LaTeX Much improved presentation. Material on
coarse-graining and U(N) SHO formalism added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper constructs an approximate sinusoidal wave packet solution to the
equations of loop quantum gravity (LQG). There is an SU(2) holonomy on each
edge of the LQG simplex, and the goal is to study the behavior of these
holonomies under the influence of a passing gravitational wave. The equations
are solved in a ... | [
{
"created": "Sun, 12 May 2013 16:21:36 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Nov 2014 23:01:12 GMT",
"version": "v2"
}
] | 2014-11-12 | [
[
"Neville",
"Donald E.",
""
]
] | This paper constructs an approximate sinusoidal wave packet solution to the equations of loop quantum gravity (LQG). There is an SU(2) holonomy on each edge of the LQG simplex, and the goal is to study the behavior of these holonomies under the influence of a passing gravitational wave. The equations are solved in a sm... |
2307.11809 | Sneha Pradhan | Piyali Bhar, Sneha Pradhan, Adnan Malik, P.K. Sahoo | Physical Characteristics and Maximum Allowable Mass of Hybrid Star in
the Context of $f(Q)$ Gravity | EPJ C published version | Eur. Phys. J. C 83(7), 646 (2023) | 10.1140/epjc/s10052-023-11745-y | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this study, we explore several new characteristics of a static anisotropic
hybrid star with strange quark matter (SQM) and ordinary baryonic matter (OBM)
distribution. Here, we use the MIT bag model equation of state to connect the
density and pressure of SQM inside stars, whereas the linear equation of state
$p_r... | [
{
"created": "Fri, 21 Jul 2023 17:42:57 GMT",
"version": "v1"
}
] | 2023-07-25 | [
[
"Bhar",
"Piyali",
""
],
[
"Pradhan",
"Sneha",
""
],
[
"Malik",
"Adnan",
""
],
[
"Sahoo",
"P. K.",
""
]
] | In this study, we explore several new characteristics of a static anisotropic hybrid star with strange quark matter (SQM) and ordinary baryonic matter (OBM) distribution. Here, we use the MIT bag model equation of state to connect the density and pressure of SQM inside stars, whereas the linear equation of state $p_r =... |
gr-qc/0306026 | Pieter-Jan De Smet | Pieter-Jan De Smet | On stationary metrics in five dimensions | 8 pages | null | null | YITP-SB-03-25 | gr-qc | null | It is well-known that the Kerr-metric (rotating black hole in four
dimensions) has Petrov type D. We prove a similar property in five dimensions.
The Myers-Perry metric (rotating black hole in five dimensions) with one
non-zero angular momentum has Petrov type \underline{22}. Conversely, we show
that the Myers-Perry ... | [
{
"created": "Fri, 6 Jun 2003 17:03:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"De Smet",
"Pieter-Jan",
""
]
] | It is well-known that the Kerr-metric (rotating black hole in four dimensions) has Petrov type D. We prove a similar property in five dimensions. The Myers-Perry metric (rotating black hole in five dimensions) with one non-zero angular momentum has Petrov type \underline{22}. Conversely, we show that the Myers-Perry so... |
1805.01066 | Shinji Tsujikawa | Lavinia Heisenberg, Ryotaro Kase, Shinji Tsujikawa | Cosmology in scalar-vector-tensor theories | 17pages, 4 figures | Phys. Rev. D 98, 024038 (2018) | 10.1103/PhysRevD.98.024038 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the cosmology on the Friedmann-Lemaitre-Robertson-Walker background
in scalar-vector-tensor theories with a broken $U(1)$ gauge symmetry. For
parity-invariant interactions arising in scalar-vector-tensor theories with
second-order equations of motion, we derive conditions for the absence of
ghosts and Laplac... | [
{
"created": "Thu, 3 May 2018 00:41:53 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jul 2018 12:53:35 GMT",
"version": "v2"
}
] | 2018-07-27 | [
[
"Heisenberg",
"Lavinia",
""
],
[
"Kase",
"Ryotaro",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We study the cosmology on the Friedmann-Lemaitre-Robertson-Walker background in scalar-vector-tensor theories with a broken $U(1)$ gauge symmetry. For parity-invariant interactions arising in scalar-vector-tensor theories with second-order equations of motion, we derive conditions for the absence of ghosts and Laplacia... |
1710.05990 | Anna Ijjas | Anna Ijjas | Space-time slicing in Horndeski theories and its implications for
non-singular bouncing solutions | 33 pages, 3 figures; accepted for publication in JCAP; v2: updated to
match journal version | JCAP 02 (2018) 007 | 10.1088/1475-7516/2018/02/007 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we show how the proper choice of gauge is critical in
analyzing the stability of non-singular cosmological bounce solutions based on
Horndeski theories. We show that it is possible to construct non-singular
cosmological bounce solutions with classically stable behavior for all modes
with wavelengths ab... | [
{
"created": "Mon, 16 Oct 2017 20:20:57 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Jan 2018 16:35:41 GMT",
"version": "v2"
}
] | 2018-02-07 | [
[
"Ijjas",
"Anna",
""
]
] | In this paper, we show how the proper choice of gauge is critical in analyzing the stability of non-singular cosmological bounce solutions based on Horndeski theories. We show that it is possible to construct non-singular cosmological bounce solutions with classically stable behavior for all modes with wavelengths abov... |
1303.2469 | Mikjel Thorsrud | Mikjel Thorsrud | Quintessence with Kaluza-Klein type couplings to matter and an
isotropy-violating vector field | 3 pages, 1 figure. Contribution to the proceedings of the 13th Marcel
Grossmann Meeting (MG13), Stockholm, 1-7 July 2012 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the dynamics of a scalar field with Kaluza-Klein type couplings to
cold dark matter and an isotropy-violating vector field. The vector coupling,
$f^2(\phi)F^2$, has been studied thoroughly in the context of inflation
recently. We generalize the model to a dark energy context and study the
cosmological conseq... | [
{
"created": "Mon, 11 Mar 2013 10:07:02 GMT",
"version": "v1"
}
] | 2013-03-12 | [
[
"Thorsrud",
"Mikjel",
""
]
] | We study the dynamics of a scalar field with Kaluza-Klein type couplings to cold dark matter and an isotropy-violating vector field. The vector coupling, $f^2(\phi)F^2$, has been studied thoroughly in the context of inflation recently. We generalize the model to a dark energy context and study the cosmological conseque... |
1611.06680 | Andronikos Paliathanasis | John D. Barrow and Andronikos Paliathanasis | Reconstructions of the dark-energy equation of state and the
inflationary potential | 17 pages, 7 figures, discussion improved, references added, to appear
in GRG | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use a mathematical approach based on the constraints systems in order to
reconstruct the equation of state and the inflationary potential for the
inflaton field from the observed spectral indices for the density perturbations
$n_{s}$ and the tensor to scalar ratio $r$. From the astronomical data, we can
observe th... | [
{
"created": "Mon, 21 Nov 2016 08:36:06 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jun 2017 16:05:02 GMT",
"version": "v2"
},
{
"created": "Sat, 9 Jun 2018 13:57:37 GMT",
"version": "v3"
}
] | 2018-06-12 | [
[
"Barrow",
"John D.",
""
],
[
"Paliathanasis",
"Andronikos",
""
]
] | We use a mathematical approach based on the constraints systems in order to reconstruct the equation of state and the inflationary potential for the inflaton field from the observed spectral indices for the density perturbations $n_{s}$ and the tensor to scalar ratio $r$. From the astronomical data, we can observe that... |
1507.04683 | Federico Lopez Armengol | Gustavo E. Romero, Daniela P\'erez and Federico G. Lopez Armengol | Cosmological black holes and the direction of time | 13 pages, 2 figures in Foundations of Science (2017) | null | 10.1007/s10699-017-9527-x | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Macroscopic irreversible processes emerge from fundamental physical laws of
reversible character. The source of the local irreversibility seems to be not
in the laws themselves but in the initial and boundary conditions of the
equations that represent the laws. In this work we propose that the screening
of currents b... | [
{
"created": "Mon, 13 Jul 2015 18:27:55 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Mar 2017 18:49:31 GMT",
"version": "v2"
}
] | 2017-03-20 | [
[
"Romero",
"Gustavo E.",
""
],
[
"Pérez",
"Daniela",
""
],
[
"Armengol",
"Federico G. Lopez",
""
]
] | Macroscopic irreversible processes emerge from fundamental physical laws of reversible character. The source of the local irreversibility seems to be not in the laws themselves but in the initial and boundary conditions of the equations that represent the laws. In this work we propose that the screening of currents by ... |
0707.3830 | Neven Bilic | Neven Bilic, Branko Guberina, Raul Horvat, Hrvoje Nikolic and Hrvoje
Stefancic | On Cosmological Implications of Gravitational Trace Anomaly | 11 pages, equation (4) corrected, discussions expanded, references
added, results unchanged, to appear in PLB | Phys.Lett.B657:232-237,2007 | 10.1016/j.physletb.2007.09.067 | null | gr-qc astro-ph hep-th | null | We study the infrared effective theory of gravity that stems from the quantum
trace anomaly. Quantum fluctuations of the metric induce running of the
cosmological constant and the Newton constant at cosmological scales. By
imposing the generalized Bianchi identity we obtain a prediction for the scale
dependence of th... | [
{
"created": "Thu, 26 Jul 2007 14:43:32 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Jul 2007 13:25:49 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Oct 2007 13:11:36 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Bilic",
"Neven",
""
],
[
"Guberina",
"Branko",
""
],
[
"Horvat",
"Raul",
""
],
[
"Nikolic",
"Hrvoje",
""
],
[
"Stefancic",
"Hrvoje",
""
]
] | We study the infrared effective theory of gravity that stems from the quantum trace anomaly. Quantum fluctuations of the metric induce running of the cosmological constant and the Newton constant at cosmological scales. By imposing the generalized Bianchi identity we obtain a prediction for the scale dependence of the ... |
0708.4388 | Bjoern S. Schmekel | Bjoern S. Schmekel | Quasi-local definitions of energy in general relativity | 4 pages, very brief review article about quasi-local energy | Matters of Gravity, 30, 13 (2007), arXiv:0709.0942 | null | null | gr-qc | null | The problem of defining energy in general relativity is reviewed very
briefly, and the properties of Brown-York-like expressions are discussed.
| [
{
"created": "Fri, 31 Aug 2007 16:55:44 GMT",
"version": "v1"
}
] | 2007-09-08 | [
[
"Schmekel",
"Bjoern S.",
""
]
] | The problem of defining energy in general relativity is reviewed very briefly, and the properties of Brown-York-like expressions are discussed. |
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