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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/9912031 | Scott A. Hughes | Scott A. Hughes | Gravitational waves from inspiral into massive black holes | 7 pages, 2 figures. To appear in the proceedings of the 3rd Edoardo
Amaldi meeting | null | null | null | gr-qc astro-ph | null | Space-based gravitational-wave interferometers such as LISA will be sensitive
to the inspiral of stellar mass compact objects into black holes with masses in
the range of roughly 10^5 solar masses to (a few) 10^7 solar masses. During the
last year of inspiral, the compact body spends several hundred thousand orbits
s... | [
{
"created": "Wed, 8 Dec 1999 21:47:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Hughes",
"Scott A.",
""
]
] | Space-based gravitational-wave interferometers such as LISA will be sensitive to the inspiral of stellar mass compact objects into black holes with masses in the range of roughly 10^5 solar masses to (a few) 10^7 solar masses. During the last year of inspiral, the compact body spends several hundred thousand orbits spi... |
gr-qc/9703080 | Maartens R. Staf | Roy Maartens, William Lesame, George Ellis | Consistency of dust solutions with div H=0 | 3 pages Revtex | Phys.Rev. D55 (1997) 5219-5221 | 10.1103/PhysRevD.55.5219 | Portsmouth RCG 96/17 | gr-qc | null | One of the necessary covariant conditions for gravitational radiation is the
vanishing of the divergence of the magnetic Weyl tensor H_{ab}, while H_{ab}
itself is nonzero. We complete a recent analysis by showing that in
irrotational dust spacetimes, the condition div H=0 evolves consistently in the
exact nonlinear ... | [
{
"created": "Thu, 27 Mar 1997 10:43:30 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Maartens",
"Roy",
""
],
[
"Lesame",
"William",
""
],
[
"Ellis",
"George",
""
]
] | One of the necessary covariant conditions for gravitational radiation is the vanishing of the divergence of the magnetic Weyl tensor H_{ab}, while H_{ab} itself is nonzero. We complete a recent analysis by showing that in irrotational dust spacetimes, the condition div H=0 evolves consistently in the exact nonlinear th... |
gr-qc/0101096 | Masayuki Tanimoto | Masayuki Tanimoto | Symmetries of the Gowdy Equations and Spatial Topologies | 6 pages, 2 figures, LaTeX. To appear in the proceedings of JGRG10,
Osaka, Sept. 11-14, 2000 | null | null | null | gr-qc | null | We examine some kinds of discrete symmetries which are dynamically preserved,
using the (generalized) Gowdy models of the first kind.
| [
{
"created": "Thu, 25 Jan 2001 14:49:21 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Tanimoto",
"Masayuki",
""
]
] | We examine some kinds of discrete symmetries which are dynamically preserved, using the (generalized) Gowdy models of the first kind. |
0705.4120 | Carlos A. S. Almeida | M. O. Tahim, R. R. Landim, and C. A. S. Almeida | Spacetime as a deformable solid | 5 pages, RevTex4 | null | null | null | gr-qc hep-th | null | In this letter we discuss the possibility of treating the spacetime by itself
as a kind of deformable body for which we can define an fundamental lattice,
just like atoms in crystal lattices. We show three signs pointing in that
direction. We simulate the spacetime manifold by a very specific congruence of
curves and... | [
{
"created": "Mon, 28 May 2007 22:33:16 GMT",
"version": "v1"
}
] | 2007-05-30 | [
[
"Tahim",
"M. O.",
""
],
[
"Landim",
"R. R.",
""
],
[
"Almeida",
"C. A. S.",
""
]
] | In this letter we discuss the possibility of treating the spacetime by itself as a kind of deformable body for which we can define an fundamental lattice, just like atoms in crystal lattices. We show three signs pointing in that direction. We simulate the spacetime manifold by a very specific congruence of curves and u... |
1603.05337 | Rod Aros Mr. | Rodrigo Aros and Milko Estrada | Study of branes with variable tension | null | Commun.Theor.Phys. 68 (2017) no.5, 595 | 10.1088/0253-6102/68/5/595 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we study a brane world model with variable tension which gives
rise to four dimensional cosmologies. The brane worlds obtained correspond to
E\"{o}tv\"{o}s branes whose (internal) geometry can be casted as either a four
dimensional (A)dS$_{4}$ or a standard radiation period cosmology. The matter
dominate... | [
{
"created": "Thu, 17 Mar 2016 02:30:55 GMT",
"version": "v1"
}
] | 2017-11-21 | [
[
"Aros",
"Rodrigo",
""
],
[
"Estrada",
"Milko",
""
]
] | In this work we study a brane world model with variable tension which gives rise to four dimensional cosmologies. The brane worlds obtained correspond to E\"{o}tv\"{o}s branes whose (internal) geometry can be casted as either a four dimensional (A)dS$_{4}$ or a standard radiation period cosmology. The matter dominated ... |
2212.10413 | Vinod Bhardwaj Dr. | Archana Dixit, Anirudh Pradhan, Vinod Kumar Bhardwaj, A. Beesham | Observational constraints for an axially symmetric transitioning model
with bulk viscosity parameterization | 25 pages, 14 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In this paper, we have analyzed the significance of bulk viscosity in an
axially symmetric Bianchi type-I model to study the accelerated expansion of
the universe. We have considered four bulk viscosity parameterizations for the
matter-dominated cosmological model. The function of the two significant Hubble
$H(z)$ an... | [
{
"created": "Tue, 20 Dec 2022 16:42:47 GMT",
"version": "v1"
}
] | 2022-12-21 | [
[
"Dixit",
"Archana",
""
],
[
"Pradhan",
"Anirudh",
""
],
[
"Bhardwaj",
"Vinod Kumar",
""
],
[
"Beesham",
"A.",
""
]
] | In this paper, we have analyzed the significance of bulk viscosity in an axially symmetric Bianchi type-I model to study the accelerated expansion of the universe. We have considered four bulk viscosity parameterizations for the matter-dominated cosmological model. The function of the two significant Hubble $H(z)$ and ... |
gr-qc/0101098 | R. M. Kiehn | R. M. Kiehn | Falaco Solitons, Cosmic Strings in a Swimming Pool | 6 pages pdf 3 figures included | null | null | null | gr-qc | null | Topological defects experimentally induced by rotational dynamics in a
continuous media replicate the coherent structure features of cosmic strings as
well as hadrons.
| [
{
"created": "Thu, 25 Jan 2001 20:34:12 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kiehn",
"R. M.",
""
]
] | Topological defects experimentally induced by rotational dynamics in a continuous media replicate the coherent structure features of cosmic strings as well as hadrons. |
1305.5409 | Cosimo Bambi | Cosimo Bambi | Measuring the Kerr spin parameter of a non-Kerr compact object with the
continuum-fitting and the iron line methods | 1+14 pages, 5 figures. v2: refereed version | JCAP 1308:055,2013 | 10.1088/1475-7516/2013/08/055 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Under the assumption that astrophysical black hole candidates are the Kerr
black holes of general relativity, the continuum-fitting method and the
analysis of the K$\alpha$ iron line are today the only available techniques
capable of providing a relatively reliable estimate of the spin parameter of
these objects. If ... | [
{
"created": "Thu, 23 May 2013 13:19:35 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Aug 2013 11:36:47 GMT",
"version": "v2"
}
] | 2013-09-02 | [
[
"Bambi",
"Cosimo",
""
]
] | Under the assumption that astrophysical black hole candidates are the Kerr black holes of general relativity, the continuum-fitting method and the analysis of the K$\alpha$ iron line are today the only available techniques capable of providing a relatively reliable estimate of the spin parameter of these objects. If we... |
1207.3873 | Sergei Kopeikin | Sergei Kopeikin (University of Missouri, Columbia, USA) | Celestial Ephemerides in an Expanding Universe | 27 pages, accepted to Phys. Rev. D | Phys. Rev. D 86, 064004 (2012) | 10.1103/PhysRevD.86.064004 | null | gr-qc astro-ph.CO physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Post-Newtonian theory was instrumental in conducting the critical
experimental tests of general relativity and in building the astronomical
ephemerides of celestial bodies in the solar system with an unparalleled
precision. The cornerstone of the theory is the postulate that the solar system
is gravitationally isolat... | [
{
"created": "Tue, 17 Jul 2012 04:07:33 GMT",
"version": "v1"
}
] | 2012-09-06 | [
[
"Kopeikin",
"Sergei",
"",
"University of Missouri, Columbia, USA"
]
] | Post-Newtonian theory was instrumental in conducting the critical experimental tests of general relativity and in building the astronomical ephemerides of celestial bodies in the solar system with an unparalleled precision. The cornerstone of the theory is the postulate that the solar system is gravitationally isolated... |
1906.07014 | Yurij Baryshev | Yurij Baryshev and Sergey Oschepkov | A solution of the van Dam-Veltman-Zakharov discontinuity problem in the
frame of the Poincare-covariant field gravitation theory | 12 pages, 31 ref | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The van Dam-Veltman-Zakharov (vDVZ) mass discontinuity problem can be solved
in the frame of the linear approximation of the Poincare-covariant second rank
symmetric tensor field gravitation theory. Conservation of the source
energy-momentum tensor, together with gauge invariance of the field equations,
lead to gener... | [
{
"created": "Fri, 14 Jun 2019 17:46:43 GMT",
"version": "v1"
}
] | 2019-06-18 | [
[
"Baryshev",
"Yurij",
""
],
[
"Oschepkov",
"Sergey",
""
]
] | The van Dam-Veltman-Zakharov (vDVZ) mass discontinuity problem can be solved in the frame of the linear approximation of the Poincare-covariant second rank symmetric tensor field gravitation theory. Conservation of the source energy-momentum tensor, together with gauge invariance of the field equations, lead to generat... |
gr-qc/9808053 | S. Mignemi | S. Mignemi (Universita di Cagliari) | Charged gravitational instantons in five-dimensional
Einstein-Gauss-Bonnet-Maxwell theory | 8 pages, plain TeX | Gen.Rel.Grav. 30 (1998) 1795-1801 | 10.1023/A:1026671212653 | INFNCA-TH9806 | gr-qc | null | We study a solution of the Einstein-Gauus-Bonnet theory in 5 dimensions
coupled to a Maxwell field, whose euclidean continuation gives rise to an
instanton describing black hole pair production. We also discuss the dual
theory with a 3-form field coupled to gravity.
| [
{
"created": "Wed, 19 Aug 1998 17:13:06 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Mignemi",
"S.",
"",
"Universita di Cagliari"
]
] | We study a solution of the Einstein-Gauus-Bonnet theory in 5 dimensions coupled to a Maxwell field, whose euclidean continuation gives rise to an instanton describing black hole pair production. We also discuss the dual theory with a 3-form field coupled to gravity. |
2010.05061 | Orlando Luongo | Roberto Giamb\`o, Orlando Luongo and Hernando Quevedo | Repulsive regions in Lema\^itre-Tolman-Bondi gravitational collapse | 12 pages, 3 figures | Phys. dark univ., 30, 100721, (2020) | 10.1016/j.dark.2020.100721 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that in the inhomogeneous Lema{\^i}tre-Tolman-Bondi space-time there
are specific regions in which repulsive gravity exists. To find these regions,
we use an invariant definition of repulsive gravity based upon the behavior of
the curvature eigenvalues. In addition, we analyze the effects of repulsive
gravity... | [
{
"created": "Sat, 10 Oct 2020 18:18:26 GMT",
"version": "v1"
}
] | 2020-10-13 | [
[
"Giambò",
"Roberto",
""
],
[
"Luongo",
"Orlando",
""
],
[
"Quevedo",
"Hernando",
""
]
] | We show that in the inhomogeneous Lema{\^i}tre-Tolman-Bondi space-time there are specific regions in which repulsive gravity exists. To find these regions, we use an invariant definition of repulsive gravity based upon the behavior of the curvature eigenvalues. In addition, we analyze the effects of repulsive gravity o... |
2309.09474 | Mohamed Fawzy Abbas Aly Mr. | Fawzi Aly, Dejan Stojkovic | In Horizon Penetrating Coordinates: Kerr Black Hole Metric Perturbation
Construction and Completion | null | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/licenses/by/4.0/ | We investigate the Teukolsky equation in horizon-penetrating coordinates to
study the behavior of perturbation waves crossing the outer horizon. For this
purpose, we use the null ingoing/outgoing Eddington-Finkelstein coordinates.
The first derivative of the radial equation is a Fuchsian differential equation
with an... | [
{
"created": "Mon, 18 Sep 2023 04:13:37 GMT",
"version": "v1"
}
] | 2023-09-19 | [
[
"Aly",
"Fawzi",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | We investigate the Teukolsky equation in horizon-penetrating coordinates to study the behavior of perturbation waves crossing the outer horizon. For this purpose, we use the null ingoing/outgoing Eddington-Finkelstein coordinates. The first derivative of the radial equation is a Fuchsian differential equation with an a... |
1501.04879 | Giuseppe d'Ambrosi | G. d'Ambrosi, S. Satish Kumar, J.W. van Holten | Covariant hamiltonian spin dynamics in curved space-time | 14 pages, accepted version for Phys Lett B, added a footnote and two
references | Phys. Lett. B 743 (2015), 478 | 10.1016/j.physletb.2015.03.007 | NIKHEF/2015-001 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dynamics of spinning particles in curved space-time is discussed,
emphasizing the hamiltonian formulation. Different choices of hamiltonians
allow for the description of different gravitating systems. We give full
results for the simplest case with minimal hamiltonian, constructing constants
of motion including s... | [
{
"created": "Tue, 20 Jan 2015 16:59:30 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Mar 2015 10:38:41 GMT",
"version": "v2"
}
] | 2015-11-24 | [
[
"d'Ambrosi",
"G.",
""
],
[
"Kumar",
"S. Satish",
""
],
[
"van Holten",
"J. W.",
""
]
] | The dynamics of spinning particles in curved space-time is discussed, emphasizing the hamiltonian formulation. Different choices of hamiltonians allow for the description of different gravitating systems. We give full results for the simplest case with minimal hamiltonian, constructing constants of motion including spi... |
2007.13165 | Gabriel German | Gabriel German | Evolution of the universe during the inflationary epoch | 14 pages, 13 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We often find in the literature solutions to the Friedmann and fluid
equations for simple cosmological models during the matter, radiation or
cosmological constant dominated epochs. However no solutions appear for the
inflationary era dominated by the potential energy of a scalar field due,
perhaps, to the fact that ... | [
{
"created": "Sun, 26 Jul 2020 16:18:29 GMT",
"version": "v1"
}
] | 2020-07-30 | [
[
"German",
"Gabriel",
""
]
] | We often find in the literature solutions to the Friedmann and fluid equations for simple cosmological models during the matter, radiation or cosmological constant dominated epochs. However no solutions appear for the inflationary era dominated by the potential energy of a scalar field due, perhaps, to the fact that we... |
1309.3503 | Jose Javier Arenas Ferrer | Jose J. Arenas | The effect of the cosmological expansion on local systems:
Post-Newtonian approximation | null | null | null | null | gr-qc astro-ph.EP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Frequently, the quantitative effect of the large-scale cosmological expansion
on local systems is studied in the light of Newtonian approach, and the General
Relativity Theory is neglected. We, however, analyze the influence of
cosmological expansion on small systems in the light of Post-Newtonian
approximation. The ... | [
{
"created": "Fri, 13 Sep 2013 16:40:07 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2013 18:44:37 GMT",
"version": "v2"
},
{
"created": "Wed, 2 Oct 2013 18:13:27 GMT",
"version": "v3"
},
{
"created": "Sat, 30 Nov 2013 10:51:20 GMT",
"version": "v4"
}
] | 2013-12-03 | [
[
"Arenas",
"Jose J.",
""
]
] | Frequently, the quantitative effect of the large-scale cosmological expansion on local systems is studied in the light of Newtonian approach, and the General Relativity Theory is neglected. We, however, analyze the influence of cosmological expansion on small systems in the light of Post-Newtonian approximation. The eq... |
1910.05908 | Ratchaphat Nakarachinda | Pitayuth Wongjun, Chun-Hung Chen, and Ratchaphat Nakarachinda | Quasinormal modes of a massless Dirac field in de Rham-Gabadadze-Tolley
massive gravity | 35 pages, 7 figures | Phys. Rev. D 101, 124033 (2020) | 10.1103/PhysRevD.101.124033 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The quasinormal modes of a massless Dirac field in the de
Rham-Gabadadze-Tolley (dRGT) massive gravity theory with asymptotically de
Sitter spacetime are investigated using the Wentzel- Kramers-Brillouin (WKB)
approximation. The effective potential for the massless Dirac field due to the
dRGT black hole is derived. I... | [
{
"created": "Mon, 14 Oct 2019 03:59:55 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Jun 2020 06:51:29 GMT",
"version": "v2"
}
] | 2020-06-19 | [
[
"Wongjun",
"Pitayuth",
""
],
[
"Chen",
"Chun-Hung",
""
],
[
"Nakarachinda",
"Ratchaphat",
""
]
] | The quasinormal modes of a massless Dirac field in the de Rham-Gabadadze-Tolley (dRGT) massive gravity theory with asymptotically de Sitter spacetime are investigated using the Wentzel- Kramers-Brillouin (WKB) approximation. The effective potential for the massless Dirac field due to the dRGT black hole is derived. It ... |
1107.0242 | S Habib Mazharimousavi | S. Habib Mazharimousavi, M. Halilsoy and T. Tahamtan | Regular charged black hole construction in 2+1 -dimensions | 9 pages, 2 figures, final version for publication in Physics Letters
A | Physics Letters A 376 (2012) 893 | 10.1016/j.physleta.2012.01.001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well-known that unlike its chargeless version the charged
Banados-Teitelboim-Zanelli (BTZ) black hole solution in 2+1- dimensional
spacetime is singular. We construct a charged, regular extension of the BTZ
black hole solution by employing nonlinear Born-Infeld electrodynamics,
supplemented with the Hoffmann te... | [
{
"created": "Fri, 1 Jul 2011 14:51:10 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Jan 2012 10:03:18 GMT",
"version": "v2"
}
] | 2012-02-13 | [
[
"Mazharimousavi",
"S. Habib",
""
],
[
"Halilsoy",
"M.",
""
],
[
"Tahamtan",
"T.",
""
]
] | It is well-known that unlike its chargeless version the charged Banados-Teitelboim-Zanelli (BTZ) black hole solution in 2+1- dimensional spacetime is singular. We construct a charged, regular extension of the BTZ black hole solution by employing nonlinear Born-Infeld electrodynamics, supplemented with the Hoffmann term... |
gr-qc/9802029 | Nivaldo A. Lemos | Flavio G. Alvarenga and Nivaldo A. Lemos | Dynamical Vacuum in Quantum Cosmology | Latex, 19 pages, to appear in Gen. Rel. Grav | Gen.Rel.Grav. 30 (1998) 681-694 | 10.1023/A:1018896900336 | null | gr-qc | null | By regarding the vacuum as a perfect fluid with equation of state p=-rho, de
Sitter's cosmological model is quantized. Our treatment differs from previous
ones in that it endows the vacuum with dynamical degrees of freedom. Instead of
being postulated from the start, the cosmological constant arises from the
degrees ... | [
{
"created": "Fri, 13 Feb 1998 17:55:40 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Alvarenga",
"Flavio G.",
""
],
[
"Lemos",
"Nivaldo A.",
""
]
] | By regarding the vacuum as a perfect fluid with equation of state p=-rho, de Sitter's cosmological model is quantized. Our treatment differs from previous ones in that it endows the vacuum with dynamical degrees of freedom. Instead of being postulated from the start, the cosmological constant arises from the degrees of... |
gr-qc/9602054 | Neil Cornish | Neil J. Cornish | Time and Chaos in General Relativity | 4 pages, RevTeX, 1 figure | null | null | CWRU-P14-95 | gr-qc | null | The study of dynamics in general relativity has been hampered by a lack of
coordinate independent measures of chaos. Here we present a variety of
invariant measures for quantifying chaotic dynamics in relativity by exploiting
the coordinate independence of fractal dimensions. We discuss how preferred
choices of time ... | [
{
"created": "Tue, 27 Feb 1996 19:11:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Cornish",
"Neil J.",
""
]
] | The study of dynamics in general relativity has been hampered by a lack of coordinate independent measures of chaos. Here we present a variety of invariant measures for quantifying chaotic dynamics in relativity by exploiting the coordinate independence of fractal dimensions. We discuss how preferred choices of time na... |
2006.01763 | Kavoos Abbasi | Kavoos Abbasi, Shirvan Gharaati | A Tsallisian Universe | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we adopt the Verlinde hypothesis on the origin of gravity as
the consequence of the tendency of systems to increase their entropy, and
employ the Tsallis statistics. Thereinafter, modifications to the Newtonian
second law of motion, its gravity and radial velocity profile are studied. In
addition and i... | [
{
"created": "Tue, 2 Jun 2020 16:42:57 GMT",
"version": "v1"
}
] | 2020-06-03 | [
[
"Abbasi",
"Kavoos",
""
],
[
"Gharaati",
"Shirvan",
""
]
] | In this paper, we adopt the Verlinde hypothesis on the origin of gravity as the consequence of the tendency of systems to increase their entropy, and employ the Tsallis statistics. Thereinafter, modifications to the Newtonian second law of motion, its gravity and radial velocity profile are studied. In addition and in ... |
2203.05461 | Atul Kedia | Atul Kedia, Hee Il Kim, In-Saeng Suh, Grant J. Mathews | Binary neutron star mergers as a probe of quark-hadron crossover
equations of state | 8 pages, 3 figures | Phys. Rev. D 106, 103027 (2022) | 10.1103/PhysRevD.106.103027 | null | gr-qc astro-ph.HE nucl-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is anticipated that the gravitational radiation detected in future
gravitational wave (GW) detectors from binary neutron star (NS) mergers can
probe the high-density equation of state (EOS). We perform the first
simulations of binary NS mergers which adopt various parametrizations of the
quark-hadron crossover (QH... | [
{
"created": "Thu, 10 Mar 2022 16:34:30 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Nov 2022 21:53:10 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Nov 2022 16:18:57 GMT",
"version": "v3"
}
] | 2023-11-15 | [
[
"Kedia",
"Atul",
""
],
[
"Kim",
"Hee Il",
""
],
[
"Suh",
"In-Saeng",
""
],
[
"Mathews",
"Grant J.",
""
]
] | It is anticipated that the gravitational radiation detected in future gravitational wave (GW) detectors from binary neutron star (NS) mergers can probe the high-density equation of state (EOS). We perform the first simulations of binary NS mergers which adopt various parametrizations of the quark-hadron crossover (QHC)... |
1301.3927 | Christopher Pope | G. W. Gibbons, A. H. Mujtaba and C. N. Pope | Ergoregions in Magnetised Black Hole Spacetimes | 31 pages. Typos corrected, references added, discussion of asymptotic
structure extended | null | null | DAMTP-2013-5, MIFPA-13-02 | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The spacetimes obtained by Ernst's procedure for appending an external
magnetic field $B$ to a seed Kerr-Newman black hole are commonly believed to be
asymptotic to the static Melvin solution. We show that this is not in general
true. Unless the electric charge of the black hole satisfies $Q= jB(1+ 1/4 j^2
B^4)$, whe... | [
{
"created": "Wed, 16 Jan 2013 21:34:12 GMT",
"version": "v1"
},
{
"created": "Wed, 24 Apr 2013 14:18:58 GMT",
"version": "v2"
}
] | 2013-04-25 | [
[
"Gibbons",
"G. W.",
""
],
[
"Mujtaba",
"A. H.",
""
],
[
"Pope",
"C. N.",
""
]
] | The spacetimes obtained by Ernst's procedure for appending an external magnetic field $B$ to a seed Kerr-Newman black hole are commonly believed to be asymptotic to the static Melvin solution. We show that this is not in general true. Unless the electric charge of the black hole satisfies $Q= jB(1+ 1/4 j^2 B^4)$, where... |
gr-qc/9405004 | Mark Trodden | R. Moessner and M. Trodden (Brown University) | Singularity-Free Two Dimensional Cosmologies | 15 pages, uses LaTeX, 7 figures (available from the authors),
significant changes to conformal matter section, more figures added | Phys.Rev.D51:2801-2807,1995 | 10.1103/PhysRevD.51.2801 | BROWN-HET-942 | gr-qc hep-th | null | We present a class of theories of two dimensional gravity which admits
homogeneous and isotropic solutions that are nonsingular and asymptotically
approach a FRW matter dominated universe at late times. These models are
generalizations of two dimensional dilaton gravity and both vacuum solutions
and those including c... | [
{
"created": "Mon, 2 May 1994 17:41:49 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Nov 1994 18:36:25 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Moessner",
"R.",
"",
"Brown University"
],
[
"Trodden",
"M.",
"",
"Brown University"
]
] | We present a class of theories of two dimensional gravity which admits homogeneous and isotropic solutions that are nonsingular and asymptotically approach a FRW matter dominated universe at late times. These models are generalizations of two dimensional dilaton gravity and both vacuum solutions and those including con... |
1512.03684 | Edward Wilson-Ewing | Edward Wilson-Ewing | Anisotropic loop quantum cosmology with self-dual variables | 16 pages, v2: Clarifications added, typos corrected | Phys. Rev. D 93, 083502 (2016) | 10.1103/PhysRevD.93.083502 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A loop quantization of the diagonal class A Bianchi models starting from the
complex-valued self-dual connection variables is presented in this paper. The
basic operators in the quantum theory correspond to areas and generalized
holonomies of the Ashtekar connection and the reality conditions are
implemented via the ... | [
{
"created": "Fri, 11 Dec 2015 15:54:26 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2016 12:24:29 GMT",
"version": "v2"
}
] | 2016-04-13 | [
[
"Wilson-Ewing",
"Edward",
""
]
] | A loop quantization of the diagonal class A Bianchi models starting from the complex-valued self-dual connection variables is presented in this paper. The basic operators in the quantum theory correspond to areas and generalized holonomies of the Ashtekar connection and the reality conditions are implemented via the ch... |
1412.3991 | Tommi Markkanen Ph.D. | Tommi Markkanen | Curvature induced running of the cosmological constant | 4 pages. Version 2; minor changes, added references. Published
version (PRD) | Phys. Rev. D 91, 124011; 2 June 2015 | null | HIP-2014-36/TH | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate the renormalization group flow of the
cosmological constant $\Lambda$ induced by the change in space-time curvature
in the electroweak vacuum. We calculate the generic magnitude resulting from
running in the standard model in a subtraction scheme that respects the
Appelquist-Carazzone deco... | [
{
"created": "Fri, 12 Dec 2014 13:49:43 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Jun 2015 17:36:31 GMT",
"version": "v2"
}
] | 2015-06-05 | [
[
"Markkanen",
"Tommi",
""
]
] | In this work we investigate the renormalization group flow of the cosmological constant $\Lambda$ induced by the change in space-time curvature in the electroweak vacuum. We calculate the generic magnitude resulting from running in the standard model in a subtraction scheme that respects the Appelquist-Carazzone decoup... |
1308.3308 | Tetsuya Shiromizu | Tetsuya Shiromizu, Sumio Yamada, Kentaro Tanabe | Quasi-local characteristics of dynamical extreme black holes | 4pages | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Introducing the concept of the extreme trapping horizon, we discuss geometric
features of dynamical extreme black holes in four dimensions and then derive
the integral identities which hold for the dynamical extreme black holes. We
address the causal/geometrical features too.
| [
{
"created": "Thu, 15 Aug 2013 05:26:59 GMT",
"version": "v1"
}
] | 2013-08-16 | [
[
"Shiromizu",
"Tetsuya",
""
],
[
"Yamada",
"Sumio",
""
],
[
"Tanabe",
"Kentaro",
""
]
] | Introducing the concept of the extreme trapping horizon, we discuss geometric features of dynamical extreme black holes in four dimensions and then derive the integral identities which hold for the dynamical extreme black holes. We address the causal/geometrical features too. |
gr-qc/0107010 | Marc Lachi\`eze-Rey | M. Lachi\`eze-Rey (Centre d'Etudes de Saclay, France) | Space and Observers in Cosmology | 21 pages, 6 figures. Astronomy & Astrophysics, in press | null | 10.1051/0004-6361:20010952 | CEA-00999 | gr-qc | null | I provide a prescription to define space, at a given moment, for an arbitrary
observer in an arbitrary (sufficiently regular) curved space-time. This
prescription, based on synchronicity (simultaneity) arguments, defines a
foliation of space-time, which corresponds to a family of canonically
associated observers. It ... | [
{
"created": "Tue, 3 Jul 2001 14:33:59 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Aug 2001 15:20:09 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Lachièze-Rey",
"M.",
"",
"Centre d'Etudes de Saclay, France"
]
] | I provide a prescription to define space, at a given moment, for an arbitrary observer in an arbitrary (sufficiently regular) curved space-time. This prescription, based on synchronicity (simultaneity) arguments, defines a foliation of space-time, which corresponds to a family of canonically associated observers. It pr... |
1406.0497 | Chris Vuille Ph.D. | Chris Vuille, James Ipser, and Jeff Gallagher | Einstein-Proca Model, Micro Black Holes, and Naked Singularities | null | General Relativity and Gravitation, Volume 34, Number 5, May 2002,
pp.689-696 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein-Proca equations, describing a spin-1 massive vector field in
general relativity, are studied in the static, spherically-symmetric case. The
Proca field equation is a highly nonlinear wave equation, but can be solved to
good accuracy in perturbation theory, which should be very accurate for a wide
range o... | [
{
"created": "Sat, 31 May 2014 01:59:14 GMT",
"version": "v1"
}
] | 2014-06-04 | [
[
"Vuille",
"Chris",
""
],
[
"Ipser",
"James",
""
],
[
"Gallagher",
"Jeff",
""
]
] | The Einstein-Proca equations, describing a spin-1 massive vector field in general relativity, are studied in the static, spherically-symmetric case. The Proca field equation is a highly nonlinear wave equation, but can be solved to good accuracy in perturbation theory, which should be very accurate for a wide range of ... |
1104.5002 | Luca Fabbri | Luca Fabbri | Metric Solutions in Torsionless Gauge for Vacuum Conformal Gravity | 11 pages | J.Math.Phys.54,062501,2013 | 10.1063/1.4808257 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a recent paper we have established the form of the metric-torsional
conformal gravitational field equations, and in the present paper we study
their vacuum configurations; we will consider a specific situation that will
enable us to look for the torsionless limit: two types of special exact
solutions are found eve... | [
{
"created": "Tue, 26 Apr 2011 19:45:05 GMT",
"version": "v1"
},
{
"created": "Fri, 31 May 2013 15:48:20 GMT",
"version": "v2"
},
{
"created": "Thu, 10 Apr 2014 12:33:14 GMT",
"version": "v3"
}
] | 2014-04-11 | [
[
"Fabbri",
"Luca",
""
]
] | In a recent paper we have established the form of the metric-torsional conformal gravitational field equations, and in the present paper we study their vacuum configurations; we will consider a specific situation that will enable us to look for the torsionless limit: two types of special exact solutions are found event... |
2112.07730 | Todd Oliynyk | Florian Beyer and Todd A. Oliynyk | Localized big bang stability for the Einstein-scalar field equations | Final version; agrees with published article | Arch. Rational Mech. Anal. 248, 3 (2024) | 10.1007/s00205-023-01939-9 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We prove the nonlinear stability in the contracting direction of
Friedmann-Lema\^itre-Robertson-Walker (FLRW) solutions to the Einstein-scalar
field equations in $n\geq 3$ spacetime dimensions that are defined on spacetime
manifolds of the form $(0,t_0]\times \mathbb{T}^{n-1}$, $t_0>0$. Stability is
established under... | [
{
"created": "Tue, 14 Dec 2021 20:18:57 GMT",
"version": "v1"
},
{
"created": "Sat, 22 Oct 2022 02:00:36 GMT",
"version": "v2"
},
{
"created": "Mon, 15 Jan 2024 21:13:42 GMT",
"version": "v3"
}
] | 2024-01-17 | [
[
"Beyer",
"Florian",
""
],
[
"Oliynyk",
"Todd A.",
""
]
] | We prove the nonlinear stability in the contracting direction of Friedmann-Lema\^itre-Robertson-Walker (FLRW) solutions to the Einstein-scalar field equations in $n\geq 3$ spacetime dimensions that are defined on spacetime manifolds of the form $(0,t_0]\times \mathbb{T}^{n-1}$, $t_0>0$. Stability is established under t... |
1006.1614 | Theo Verwimp | Theo Verwimp | Anti-de Sitter gauge theory for gravity | 36 pages;typos corrected on page 18 eqs (5.20)&(5.23) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | First a review is given of Riemann-Cartan space-time and Einstein-Cartan
gravity. This gives us the necessary tools to handle the SO(2,3) Yang-Mills
gauge theory for gravity. New here is the derivation of the conservation laws.
Finally possible solutions of the field equations are discussed. They depend on
the scale ... | [
{
"created": "Tue, 8 Jun 2010 17:08:53 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Dec 2017 14:05:17 GMT",
"version": "v2"
},
{
"created": "Mon, 14 Jun 2021 15:03:05 GMT",
"version": "v3"
},
{
"created": "Fri, 8 Oct 2021 11:06:59 GMT",
"version": "v4"
}
] | 2021-10-11 | [
[
"Verwimp",
"Theo",
""
]
] | First a review is given of Riemann-Cartan space-time and Einstein-Cartan gravity. This gives us the necessary tools to handle the SO(2,3) Yang-Mills gauge theory for gravity. New here is the derivation of the conservation laws. Finally possible solutions of the field equations are discussed. They depend on the scale of... |
1605.00764 | Hang Liu | Hang Liu, Xin-he Meng, Wei Xu and Bin Zhu | Universal entropy relations: entropy formulae and entropy bound | null | Europhys.Lett. 119 (2017) no.2, 20003 | 10.1209/0295-5075/119/20003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We survey the applications of universal entropy relations in black holes with
multi-horizons. In sharp distinction to conventional entropy product, the
entropy relationship here not only improve our understanding of black hole
entropy but was introduced as an elegant technique trick for handling various
entropy bound... | [
{
"created": "Tue, 3 May 2016 07:26:56 GMT",
"version": "v1"
}
] | 2017-10-09 | [
[
"Liu",
"Hang",
""
],
[
"Meng",
"Xin-he",
""
],
[
"Xu",
"Wei",
""
],
[
"Zhu",
"Bin",
""
]
] | We survey the applications of universal entropy relations in black holes with multi-horizons. In sharp distinction to conventional entropy product, the entropy relationship here not only improve our understanding of black hole entropy but was introduced as an elegant technique trick for handling various entropy bounds ... |
1203.2471 | Alan D. Rendall | Ho Lee and Alan D. Rendall | The Einstein-Boltzmann system and positivity | 24 pages | null | null | AEI-2012-022 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Einstein-Boltzmann system is studied, with particular attention to the
non-negativity of the solution of the Boltzmann equation. A new parametrization
of post-collisional momenta in general relativity is introduced and then used
to simplify the conditions on the collision cross-section given by Bancel and
Choquet... | [
{
"created": "Mon, 12 Mar 2012 12:30:59 GMT",
"version": "v1"
}
] | 2012-03-13 | [
[
"Lee",
"Ho",
""
],
[
"Rendall",
"Alan D.",
""
]
] | The Einstein-Boltzmann system is studied, with particular attention to the non-negativity of the solution of the Boltzmann equation. A new parametrization of post-collisional momenta in general relativity is introduced and then used to simplify the conditions on the collision cross-section given by Bancel and Choquet-B... |
1704.07713 | Bobir Toshmatov | Zden\v{e}k Stuchl\'ik, Jan Schee, Bobir Toshmatov, Jan Hlad\'ik, Jan
Novotn\'y | Gravitational instability of polytropic spheres containing region of
trapped null geodesics: a possible explanation of central supermassive black
holes in galactic halos | 28 pages, 8 figures, 2 tables | JCAP 06 (2017) 056 | 10.1088/1475-7516/2017/06/056 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study behaviour of gravitational waves in the recently introduced general
relativistic polytropic spheres containing a region of trapped null geodesics
extended around radius of the stable null circular geodesic that can exist for
the polytropic index $N>2.138$ and the relativistic parameter, giving ratio of
the c... | [
{
"created": "Tue, 25 Apr 2017 14:31:24 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Jul 2017 05:02:43 GMT",
"version": "v2"
}
] | 2017-07-04 | [
[
"Stuchlík",
"Zdeněk",
""
],
[
"Schee",
"Jan",
""
],
[
"Toshmatov",
"Bobir",
""
],
[
"Hladík",
"Jan",
""
],
[
"Novotný",
"Jan",
""
]
] | We study behaviour of gravitational waves in the recently introduced general relativistic polytropic spheres containing a region of trapped null geodesics extended around radius of the stable null circular geodesic that can exist for the polytropic index $N>2.138$ and the relativistic parameter, giving ratio of the cen... |
2211.08159 | Sahazada Aziz | Sahazada Aziz, Sohan Kumar Jha and Anisur Rahaman | The inflationary scenario in the $f(R)$ gravity model with a $R^4$ term | Published version; 14 pages, 7 figures | 2021 Class. Quantum Grav. 38 225008 | 10.1088/1361-6382/ac2dd0 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the cosmic inflation scenario of a specific $f(R)$ model that
contains more than one higher-order term in $R$. The $f(R)$ considered here has
the terms $R^2$, $R^3$, and $R^4$ along with the linear term. A rigorous
investigation has been carried out in the presence of these higher-order terms
to figure... | [
{
"created": "Tue, 15 Nov 2022 14:12:01 GMT",
"version": "v1"
}
] | 2022-11-16 | [
[
"Aziz",
"Sahazada",
""
],
[
"Jha",
"Sohan Kumar",
""
],
[
"Rahaman",
"Anisur",
""
]
] | We investigate the cosmic inflation scenario of a specific $f(R)$ model that contains more than one higher-order term in $R$. The $f(R)$ considered here has the terms $R^2$, $R^3$, and $R^4$ along with the linear term. A rigorous investigation has been carried out in the presence of these higher-order terms to figure o... |
gr-qc/9908046 | Andrei V. Frolov | Andrei V. Frolov | Continuous Self-Similarity Breaking in Critical Collapse | RevTeX 3.1, 28 pages, 5 figures; discussion rewritten to clarify
several issues | Phys.Rev. D61 (2000) 084006 | 10.1103/PhysRevD.61.084006 | null | gr-qc | null | This paper studies near-critical evolution of the spherically symmetric
scalar field configurations close to the continuously self-similar solution.
Using analytic perturbative methods, it is shown that a generic growing
perturbation departs from the critical Roberts solution in a universal way. We
argue that in the ... | [
{
"created": "Mon, 16 Aug 1999 23:20:14 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Dec 1999 03:17:00 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Frolov",
"Andrei V.",
""
]
] | This paper studies near-critical evolution of the spherically symmetric scalar field configurations close to the continuously self-similar solution. Using analytic perturbative methods, it is shown that a generic growing perturbation departs from the critical Roberts solution in a universal way. We argue that in the co... |
1004.4007 | Vitor Cardoso | C. Molina, Paolo Pani, Vitor Cardoso, Leonardo Gualtieri | Gravitational signature of Schwarzschild black holes in dynamical
Chern-Simons gravity | RevTex4, 12 pages, 8 figures, 3 Tables. v2: minor typos corrected and
references added. Published version | Phys.Rev.D81:124021,2010 | 10.1103/PhysRevD.81.124021 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dynamical Chern-Simons gravity is an extension of General Relativity in which
the gravitational field is coupled to a scalar field through a parity-violating
Chern-Simons term. In this framework, we study perturbations of spherically
symmetric black hole spacetimes, assuming that the background scalar field
vanishes.... | [
{
"created": "Thu, 22 Apr 2010 20:07:28 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Jun 2010 01:11:33 GMT",
"version": "v2"
}
] | 2013-12-04 | [
[
"Molina",
"C.",
""
],
[
"Pani",
"Paolo",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Gualtieri",
"Leonardo",
""
]
] | Dynamical Chern-Simons gravity is an extension of General Relativity in which the gravitational field is coupled to a scalar field through a parity-violating Chern-Simons term. In this framework, we study perturbations of spherically symmetric black hole spacetimes, assuming that the background scalar field vanishes. O... |
1804.01941 | Grigorios Fournodavlos | Grigorios Fournodavlos, Jan Sbierski | Generic blow-up results for the wave equation in the interior of a
Schwarzschild black hole | Minor improvements, version accepted for publication | null | 10.1007/s00205-019-01434-0 | null | gr-qc math.AP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the behaviour of smooth solutions to the wave equation,
$\square_g\psi=0$, in the interior of a fixed Schwarzschild black hole. In
particular, we obtain a full asymptotic expansion for all solutions towards
$r=0$ and show that it is characterised by its first two leading terms, the
principal logarithmic term... | [
{
"created": "Thu, 5 Apr 2018 16:31:03 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Jul 2019 14:33:41 GMT",
"version": "v2"
}
] | 2019-09-04 | [
[
"Fournodavlos",
"Grigorios",
""
],
[
"Sbierski",
"Jan",
""
]
] | We study the behaviour of smooth solutions to the wave equation, $\square_g\psi=0$, in the interior of a fixed Schwarzschild black hole. In particular, we obtain a full asymptotic expansion for all solutions towards $r=0$ and show that it is characterised by its first two leading terms, the principal logarithmic term a... |
gr-qc/0312048 | Merced Montesinos | Mauricio Mondragon and Merced Montesinos | Covariant description of parametrized nonrelativistic Hamiltonian
systems | 15 pages, latex file. corrected typos, minor changes done to match
published version | Int.J.Mod.Phys. A19 (2004) 2473-2493 | 10.1142/S0217751X04018063 | null | gr-qc hep-th physics.class-ph | null | The various phase spaces involved in the dynamics of parametrized
nonrelativistic Hamiltonian systems are displayed by using Crnkovic and
Witten's covariant canonical formalism. It is also pointed out that in Dirac's
canonical formalism there exists a freedom in the choice of the symplectic
structure on the extended ... | [
{
"created": "Mon, 8 Dec 2003 23:09:26 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Dec 2003 22:50:50 GMT",
"version": "v2"
},
{
"created": "Mon, 30 Jan 2006 22:46:11 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Mondragon",
"Mauricio",
""
],
[
"Montesinos",
"Merced",
""
]
] | The various phase spaces involved in the dynamics of parametrized nonrelativistic Hamiltonian systems are displayed by using Crnkovic and Witten's covariant canonical formalism. It is also pointed out that in Dirac's canonical formalism there exists a freedom in the choice of the symplectic structure on the extended ph... |
0909.4500 | Willians Barreto | W. Barreto (ULA), L. Castillo (UDO) and E. Barrios (ULA) | Central equation of state in spherical characteristic evolutions | 4 pages; to appear in Physical Review D | Phys.Rev.D80:084007,2009 | 10.1103/PhysRevD.80.084007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of a perfect--fluid sphere coupled to a scalar
radiation field. By ensuring a Ricci invariant regularity as a conformally flat
spacetime at the central world line we find that the fluid coupled to the
scalar field satisfies the equation of state $\rho_c+3p_c=$ constant at the
center of the sphe... | [
{
"created": "Thu, 24 Sep 2009 17:04:59 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Barreto",
"W.",
"",
"ULA"
],
[
"Castillo",
"L.",
"",
"UDO"
],
[
"Barrios",
"E.",
"",
"ULA"
]
] | We study the evolution of a perfect--fluid sphere coupled to a scalar radiation field. By ensuring a Ricci invariant regularity as a conformally flat spacetime at the central world line we find that the fluid coupled to the scalar field satisfies the equation of state $\rho_c+3p_c=$ constant at the center of the sphere... |
0905.1984 | Mauricio Bellini | Mariano Anabitarte, Mauricio Bellini, Jose Edgar Madriz Aguilar | Scale invariant scalar metric fluctuations during inflation:
non-perturbative formalism from a 5D vacuum | final version to be published in Eur. Phys. J. C | Eur.Phys.J.C65:295-301,2010 | 10.1140/epjc/s10052-009-1180-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We extend to 5D an approach of a 4D non-perturbative formalism to study
scalar metric fluctuations of a 5D Riemann-flat de Sitter background metric. In
contrast with the results obtained in 4D, the spectrum of cosmological scalar
metric fluctuations during inflation can be scale invariant and the background
inflaton ... | [
{
"created": "Tue, 12 May 2009 23:19:12 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Sep 2009 11:57:55 GMT",
"version": "v2"
},
{
"created": "Tue, 27 Oct 2009 17:39:11 GMT",
"version": "v3"
}
] | 2014-11-18 | [
[
"Anabitarte",
"Mariano",
""
],
[
"Bellini",
"Mauricio",
""
],
[
"Aguilar",
"Jose Edgar Madriz",
""
]
] | We extend to 5D an approach of a 4D non-perturbative formalism to study scalar metric fluctuations of a 5D Riemann-flat de Sitter background metric. In contrast with the results obtained in 4D, the spectrum of cosmological scalar metric fluctuations during inflation can be scale invariant and the background inflaton fi... |
2104.09007 | Vladimir Dergachev Ph.D. | Vladimir Dergachev and Maria Alessandra Papa | The search for continuous gravitational waves from small-ellipticity
sources at low frequencies | 6 pages, comments welcome | Phys. Rev. D 104, 043003 (2021) | 10.1103/PhysRevD.104.043003 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results of an all-sky search for continuous gravitational wave
signals with frequencies in the 20-500 Hz range from neutron stars with
ellipticity of 1e-8. This frequency region is particularly hard to probe
because of the quadratic dependence of signal strength on frequency. The search
employs the Fal... | [
{
"created": "Mon, 19 Apr 2021 01:50:59 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Jul 2021 00:09:04 GMT",
"version": "v2"
}
] | 2021-08-11 | [
[
"Dergachev",
"Vladimir",
""
],
[
"Papa",
"Maria Alessandra",
""
]
] | We present the results of an all-sky search for continuous gravitational wave signals with frequencies in the 20-500 Hz range from neutron stars with ellipticity of 1e-8. This frequency region is particularly hard to probe because of the quadratic dependence of signal strength on frequency. The search employs the Falco... |
2304.08584 | Marcelo E. Rubio | Pablo Montes, Marcelo E. Rubio and Oscar A. Reula | Numerical simulations of divergence-type theories for conformal
dissipative fluids | 22 pages, 14 figures | Phys. Rev. D 107, 103041 (2023) | 10.1103/PhysRevD.107.103041 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We present the first numerical simulations of the symmetric--hyperbolic
theory for conformal dissipative relativistic fluids developed in [1]. In this
theory, the information of the fluid dynamics is encoded in a scalar generating
function which depends on three free parameters. By adapting the WENO-Z
high-resolution... | [
{
"created": "Mon, 17 Apr 2023 19:57:00 GMT",
"version": "v1"
}
] | 2023-05-26 | [
[
"Montes",
"Pablo",
""
],
[
"Rubio",
"Marcelo E.",
""
],
[
"Reula",
"Oscar A.",
""
]
] | We present the first numerical simulations of the symmetric--hyperbolic theory for conformal dissipative relativistic fluids developed in [1]. In this theory, the information of the fluid dynamics is encoded in a scalar generating function which depends on three free parameters. By adapting the WENO-Z high-resolution s... |
1503.07413 | Saira Waheed | Saira Waheed, M. Zubair | Energy Constraints and $F(T,T_{G})$ Cosmology | 24 pages, 11 figures | null | 10.1007/s10509-015-2438-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present paper is elaborated to discuss the energy condition bounds in a
modified teleparallel gravity namely $F(T,T_{G})$, involving torsion invariant
$T$ and contribution from a term $T_G$, the teleparallel equivalent of the
Gauss-Bonnet term. For this purpose, we consider flat FRW universe with matter
contents ... | [
{
"created": "Thu, 19 Mar 2015 07:33:09 GMT",
"version": "v1"
}
] | 2015-09-23 | [
[
"Waheed",
"Saira",
""
],
[
"Zubair",
"M.",
""
]
] | The present paper is elaborated to discuss the energy condition bounds in a modified teleparallel gravity namely $F(T,T_{G})$, involving torsion invariant $T$ and contribution from a term $T_G$, the teleparallel equivalent of the Gauss-Bonnet term. For this purpose, we consider flat FRW universe with matter contents as... |
gr-qc/0405134 | Shinya Tomizawa | Shinya Tomizawa, Yuki Uchida and Tetsuya Shiromizu | Twist of stationary black hole/ring in five dimensions | 5 pages, 1 figure, reference added | Phys.Rev. D70 (2004) 064020 | 10.1103/PhysRevD.70.064020 | null | gr-qc | null | It is unlikely that uniqueness theorem holds for stationary black holes in
higher dimensional spacetimes. However, we will examine the possibility that
the higher multipole moments classify vacuum solutions uniquely. Especially, we
compute the potentials associated with rotational Killing vectors and look at
the depe... | [
{
"created": "Thu, 27 May 2004 02:56:53 GMT",
"version": "v1"
},
{
"created": "Mon, 31 May 2004 05:21:59 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Tomizawa",
"Shinya",
""
],
[
"Uchida",
"Yuki",
""
],
[
"Shiromizu",
"Tetsuya",
""
]
] | It is unlikely that uniqueness theorem holds for stationary black holes in higher dimensional spacetimes. However, we will examine the possibility that the higher multipole moments classify vacuum solutions uniquely. Especially, we compute the potentials associated with rotational Killing vectors and look at the depend... |
2104.13761 | Muhammad Zaeem-Ul-Haq Bhatti | M. Z. Bhatti, Z. Yousaf, Z. Tariq | Role of Structure Scalars on the evolution of Compact Objects in
Palatini $f(R)$ Gravity | 33 pages, version accepted for publications in Chinese Journal of
Physics | Chin. J. Phys. 72, 18 (2021) | 10.1016/j.cjph.2021.04.019 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | The utmost concern of this article is the construction of modified scalar
functions (structure scalars) by taking Palatini $f(R)$ gravitational theory
into account. At first, a general formalism is established in which we assess
gravitational stellar equations by putting into use the Palatini's technique.
Later, from... | [
{
"created": "Tue, 27 Apr 2021 09:59:08 GMT",
"version": "v1"
}
] | 2021-09-02 | [
[
"Bhatti",
"M. Z.",
""
],
[
"Yousaf",
"Z.",
""
],
[
"Tariq",
"Z.",
""
]
] | The utmost concern of this article is the construction of modified scalar functions (structure scalars) by taking Palatini $f(R)$ gravitational theory into account. At first, a general formalism is established in which we assess gravitational stellar equations by putting into use the Palatini's technique. Later, from t... |
gr-qc/0508081 | Frank B. Estabrook | Frank B. Estabrook | Conservation laws for vacuum tetrad gravity | Final version with additional references | Class.Quant.Grav.23:2841-2848,2006 | 10.1088/0264-9381/23/9/005 | null | gr-qc | null | Ten conservation laws in useful polynomial form are derived from a Cartan
form and Exterior Differential System (EDS) for the tetrad equations of vacuum
relativity. The Noether construction of conservation laws for well posed EDS is
introduced first, and an illustration given, deriving 15 conservation laws of
the fre... | [
{
"created": "Sat, 20 Aug 2005 00:01:48 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Sep 2005 20:38:49 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Apr 2006 18:27:51 GMT",
"version": "v3"
}
] | 2014-11-17 | [
[
"Estabrook",
"Frank B.",
""
]
] | Ten conservation laws in useful polynomial form are derived from a Cartan form and Exterior Differential System (EDS) for the tetrad equations of vacuum relativity. The Noether construction of conservation laws for well posed EDS is introduced first, and an illustration given, deriving 15 conservation laws of the free ... |
gr-qc/0504008 | Vladimir Dzhunushaliev | Vladimir Dzhunushaliev and Ratbay Myrzakulov | Physical singularity in the regular spacetime and fundamental length | changes in the text | Int. J. Mod. Phys. D, Vol. 16, 755-761 (2007) | 10.1142/S0218271807008638 | IC/IR/2005/009 | gr-qc hep-th | null | It is shown that formally regular solutions in 5D Kaluza-Klein gravity have
singularities. This phenomenon is connected with the existence of a minimal
length in nature. The calculation of the derivative of the $G_{55}$ metric
component leads to the appearance of the Dirac's $\delta-$function. In this
case the Ricci ... | [
{
"created": "Sat, 2 Apr 2005 04:12:01 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Jun 2005 11:46:13 GMT",
"version": "v2"
},
{
"created": "Thu, 7 Jun 2007 03:54:17 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] | It is shown that formally regular solutions in 5D Kaluza-Klein gravity have singularities. This phenomenon is connected with the existence of a minimal length in nature. The calculation of the derivative of the $G_{55}$ metric component leads to the appearance of the Dirac's $\delta-$function. In this case the Ricci sc... |
1002.4488 | Sergey Pavluchenko | I.V. Kirnos, S.A. Pavluchenko, A.V. Toporensky | New features of flat (4+1)-dimensional cosmological model with a perfect
fluid in Gauss-Bonnet gravity | 14 pages, 5 figures, 1 table; v2 minor corrections, conclusions
unchanged | Grav.Cosmol.16:274-282,2010 | 10.1134/S0202289310040043 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigated a flat multidimensional cosmological model in Gauss-Bonnet
gravity in presence of a matter in form of perfect fluid. We found analytically
new stationary regimes (these results are valid for arbitrary number of spatial
dimensions) and studied their stability by means of numerical recipes in
4+1-dimens... | [
{
"created": "Wed, 24 Feb 2010 08:32:10 GMT",
"version": "v1"
},
{
"created": "Wed, 31 Mar 2010 15:51:12 GMT",
"version": "v2"
}
] | 2015-03-13 | [
[
"Kirnos",
"I. V.",
""
],
[
"Pavluchenko",
"S. A.",
""
],
[
"Toporensky",
"A. V.",
""
]
] | We investigated a flat multidimensional cosmological model in Gauss-Bonnet gravity in presence of a matter in form of perfect fluid. We found analytically new stationary regimes (these results are valid for arbitrary number of spatial dimensions) and studied their stability by means of numerical recipes in 4+1-dimensio... |
2103.06862 | Ismael Delgado Gaspar PhD | Ismael Delgado Gaspar, Roberto A. Sussman, David D. McNutt, Alan A.
Coley | Comment on "Szekeres universes with homogeneous scalar fields" | 2 pages. Comment on "Szekeres universes with homogeneous scalar
fields" and "Cyclic Szekeres universes" by Barrow and Paliathanasis, Eur.
Phys. J. C. (2018, 2019); arXiv:1808.00173 and arXiv:1901.09173 | null | 10.1140/epjc/s10052-021-09113-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Two recently published papers (J.D. Barrow and A. Paliathanasis, Eur. Phys.
J. C. (2018, 2019)) claim to have found exact solutions of Einstein's field
equations belonging to the class of non-trivial Szekeres models, whose source
is a mixture of dust and a homogeneous time-dependent scalar field, where the
energy-mom... | [
{
"created": "Thu, 11 Mar 2021 18:47:24 GMT",
"version": "v1"
}
] | 2021-04-28 | [
[
"Gaspar",
"Ismael Delgado",
""
],
[
"Sussman",
"Roberto A.",
""
],
[
"McNutt",
"David D.",
""
],
[
"Coley",
"Alan A.",
""
]
] | Two recently published papers (J.D. Barrow and A. Paliathanasis, Eur. Phys. J. C. (2018, 2019)) claim to have found exact solutions of Einstein's field equations belonging to the class of non-trivial Szekeres models, whose source is a mixture of dust and a homogeneous time-dependent scalar field, where the energy-momen... |
1905.07724 | Behzad Tajahmad | Behzad Tajahmad | Late-time-accelerated expansion arisen from gauge fields in an
anisotropic background and a fruitful trick for Noether's approach | 27 pages, 13 figures (26 plots), 1 Table | null | 10.1007/JHEP02(2020)084 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, a modified teleparallel gravity action containing a coupling
between a scalar field potential and magnetism, in anisotropic and homogeneous
backgrounds, is investigated through Noether symmetry approach. The focus of
this work is to describe late-time-accelerated expansion. Since finding
analytical sol... | [
{
"created": "Sun, 19 May 2019 11:13:39 GMT",
"version": "v1"
}
] | 2020-03-18 | [
[
"Tajahmad",
"Behzad",
""
]
] | In this paper, a modified teleparallel gravity action containing a coupling between a scalar field potential and magnetism, in anisotropic and homogeneous backgrounds, is investigated through Noether symmetry approach. The focus of this work is to describe late-time-accelerated expansion. Since finding analytical solut... |
gr-qc/0611060 | E. Kyriakopoulos | E. Kyriakopoulos | Black Hole in a Model with Dilaton and Monopole Fields II | 8 pages | Int.J.Mod.Phys.D15:2223-2228,2006 | 10.1142/S0218271806009650 | null | gr-qc | null | We present an exact black hole solution in a model having besides gravity a
dilaton and a monopole field, which is a generalization of a black hole
solution we have found. The new solution, as the previous one, has three free
parameters, one of which can be identified with the monopole charge, and
another with the AD... | [
{
"created": "Fri, 10 Nov 2006 19:32:37 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Kyriakopoulos",
"E.",
""
]
] | We present an exact black hole solution in a model having besides gravity a dilaton and a monopole field, which is a generalization of a black hole solution we have found. The new solution, as the previous one, has three free parameters, one of which can be identified with the monopole charge, and another with the ADM ... |
gr-qc/0606060 | Leonardo Augusto Pach\'on Contreras | Leonardo. A. Pachon, Jorge A. Rueda, Jose D. Sanabria-Gomez | Realistic Exact Solution for the Exterior Field of a Rotating Neutron
Star | 13 pages, 13 figures, LaTeX document | Phys.Rev.D73:104038,2006 | 10.1103/PhysRevD.73.104038 | null | gr-qc | null | A new six-parametric, axisymmetric and asymptotically flat exact solution of
Einstein-Maxwell field equations having reflection symmetry is presented. It
has arbitrary physical parameters of mass, angular momentum, mass--quadrupole
moment, current octupole moment, electric charge and magnetic dipole, so it can
repres... | [
{
"created": "Tue, 13 Jun 2006 18:54:47 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pachon",
"Leonardo. A.",
""
],
[
"Rueda",
"Jorge A.",
""
],
[
"Sanabria-Gomez",
"Jose D.",
""
]
] | A new six-parametric, axisymmetric and asymptotically flat exact solution of Einstein-Maxwell field equations having reflection symmetry is presented. It has arbitrary physical parameters of mass, angular momentum, mass--quadrupole moment, current octupole moment, electric charge and magnetic dipole, so it can represen... |
0711.2084 | Lee Lindblom | Lee Lindblom, Keith D. Matthews, Oliver Rinne, and Mark A. Scheel | Gauge Drivers for the Generalized Harmonic Einstein Equations | 17 pages, 9 figures | Phys.Rev.D77:084001,2008 | 10.1103/PhysRevD.77.084001 | null | gr-qc | null | The generalized harmonic representation of Einstein's equation is manifestly
hyperbolic for a large class of gauge conditions. Unfortunately most of the
useful gauges developed over the past several decades by the numerical
relativity community are incompatible with the hyperbolicity of the equations
in this form. Th... | [
{
"created": "Tue, 13 Nov 2007 23:33:36 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Lindblom",
"Lee",
""
],
[
"Matthews",
"Keith D.",
""
],
[
"Rinne",
"Oliver",
""
],
[
"Scheel",
"Mark A.",
""
]
] | The generalized harmonic representation of Einstein's equation is manifestly hyperbolic for a large class of gauge conditions. Unfortunately most of the useful gauges developed over the past several decades by the numerical relativity community are incompatible with the hyperbolicity of the equations in this form. This... |
2004.00870 | Daniele Vigan\`o | Daniele Vigan\`o, Ricard Aguilera-Miret, Federico Carrasco, Borja
Mi\~nano, Carlos Palenzuela | GRMHD large eddy simulations with gradient subgrid-scale model | 15 pages, 7 figures Submitted to PRD | Phys. Rev. D 101, 123019 (2020) | 10.1103/PhysRevD.101.123019 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detection of binary neutron star mergers represents one of the most
important astrophysical discoveries of the recent years. Due to the extreme
matter and gravity conditions and the rich dynamics developed, it becomes a
tremendous challenge to accurately simulate numerically all the scales present
during the coll... | [
{
"created": "Thu, 2 Apr 2020 08:34:58 GMT",
"version": "v1"
}
] | 2020-07-01 | [
[
"Viganò",
"Daniele",
""
],
[
"Aguilera-Miret",
"Ricard",
""
],
[
"Carrasco",
"Federico",
""
],
[
"Miñano",
"Borja",
""
],
[
"Palenzuela",
"Carlos",
""
]
] | The detection of binary neutron star mergers represents one of the most important astrophysical discoveries of the recent years. Due to the extreme matter and gravity conditions and the rich dynamics developed, it becomes a tremendous challenge to accurately simulate numerically all the scales present during the collis... |
1211.4631 | Marco Cariglia Dr | Marco Cariglia, Valeri P. Frolov, Pavel Krtous, David Kubiznak | Electron in higher-dimensional weakly charged rotating black hole
spacetimes | 12 pages, no figures | Phys. Rev. D 87, 064003 (2013) | 10.1103/PhysRevD.87.064003 | pi-stronggrv-303 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate separability of the Dirac equation in weakly charged rotating
black hole spacetimes in all dimensions. The electromagnetic field of the black
hole is described by a test field approximation, with vector potential
proportional to the primary Killing vector field. It is shown that the
demonstrated separa... | [
{
"created": "Tue, 20 Nov 2012 00:00:18 GMT",
"version": "v1"
}
] | 2013-04-10 | [
[
"Cariglia",
"Marco",
""
],
[
"Frolov",
"Valeri P.",
""
],
[
"Krtous",
"Pavel",
""
],
[
"Kubiznak",
"David",
""
]
] | We demonstrate separability of the Dirac equation in weakly charged rotating black hole spacetimes in all dimensions. The electromagnetic field of the black hole is described by a test field approximation, with vector potential proportional to the primary Killing vector field. It is shown that the demonstrated separabi... |
2111.13501 | Naoki Tsukamoto | Naoki Tsukamoto | Gravitational lensing by a Bronnikov-Kim wormhole under a weak-field
approximation and in a strong deflection limit | 11 pages, 5 figures, minor correction, accepted for publication in
Physical Review D | Phys. Rev. D 105, 064013 (2022) | 10.1103/PhysRevD.105.064013 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider gravitational lensing under a weak-field approximation and in a
strong deflection limit by a Bronnikov-Kim wormhole with the same metric as the
one of a wormhole which has been suggested in Einstein-Dirac-Maxwell theory.
The metric approaches into the metric of an extreme charged
Reissner-Nordstr\"{o}m bl... | [
{
"created": "Fri, 26 Nov 2021 13:59:01 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Feb 2022 13:44:21 GMT",
"version": "v2"
},
{
"created": "Tue, 22 Feb 2022 15:50:53 GMT",
"version": "v3"
}
] | 2022-03-08 | [
[
"Tsukamoto",
"Naoki",
""
]
] | We consider gravitational lensing under a weak-field approximation and in a strong deflection limit by a Bronnikov-Kim wormhole with the same metric as the one of a wormhole which has been suggested in Einstein-Dirac-Maxwell theory. The metric approaches into the metric of an extreme charged Reissner-Nordstr\"{o}m blac... |
gr-qc/9405056 | Yongsung Yoon | Jewan Kim, C.J. Park and Yongsung Yoon | Phase Transition in Conformally Induced Gravity with Torsion | 7pages, no figure | Phys.Rev.D51:562-567,1995 | 10.1103/PhysRevD.51.562 | null | gr-qc hep-th | null | We have considered the quantum behavior of a conformally induced gravity in
the minimal Riemann-Cartan space. The regularized one-loop effective potential
considering the quantum fluctuations of the dilaton and the torsion fields in
the Coleman-Weinberg sector gives a sensible phase transition for an
inflationary pha... | [
{
"created": "Thu, 26 May 1994 00:17:05 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Kim",
"Jewan",
""
],
[
"Park",
"C. J.",
""
],
[
"Yoon",
"Yongsung",
""
]
] | We have considered the quantum behavior of a conformally induced gravity in the minimal Riemann-Cartan space. The regularized one-loop effective potential considering the quantum fluctuations of the dilaton and the torsion fields in the Coleman-Weinberg sector gives a sensible phase transition for an inflationary phase... |
2210.07458 | Viqar Husain | Viqar Husain, Muhammad Muzammil | Semiclassical geometrodynamics of homogeneous cosmology | 13 pages, 5 figures; substantially extended, title changed, version
to appear in Phys Rev D | null | null | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | We study the classical-quantum (CQ) hybrid dynamics of homogeneous cosmology
from a Hamiltonian perspective where the classical gravitational phase space
variables and matter state evolve self-consistently with full backreaction. We
compare numerically the classical and CQ dynamics for isotropic and anisotropic
model... | [
{
"created": "Fri, 14 Oct 2022 02:05:03 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Feb 2024 16:30:58 GMT",
"version": "v2"
}
] | 2024-02-23 | [
[
"Husain",
"Viqar",
""
],
[
"Muzammil",
"Muhammad",
""
]
] | We study the classical-quantum (CQ) hybrid dynamics of homogeneous cosmology from a Hamiltonian perspective where the classical gravitational phase space variables and matter state evolve self-consistently with full backreaction. We compare numerically the classical and CQ dynamics for isotropic and anisotropic models,... |
1711.10660 | Sumanta Chakraborty | Sumanta Chakraborty and Kinjalk Lochan | Decoding infrared imprints of quantum origins of black holes | v3: Published Version; 18 pages, 2 figures | Phys. Lett. B 789, 276 (2019) | 10.1016/j.physletb.2018.12.028 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the emission spectrum of a (fundamentally quantum) black hole in
the Kerr-Newman family by assuming a discretization of black hole geometry and
the holographic entropy-area relation. We demonstrate that, given the above
structure of black hole entropy, a macroscopic black hole always has
non-continuously s... | [
{
"created": "Wed, 29 Nov 2017 03:29:06 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jun 2018 11:44:30 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Jan 2019 01:33:54 GMT",
"version": "v3"
}
] | 2019-01-10 | [
[
"Chakraborty",
"Sumanta",
""
],
[
"Lochan",
"Kinjalk",
""
]
] | We analyze the emission spectrum of a (fundamentally quantum) black hole in the Kerr-Newman family by assuming a discretization of black hole geometry and the holographic entropy-area relation. We demonstrate that, given the above structure of black hole entropy, a macroscopic black hole always has non-continuously sep... |
gr-qc/0606071 | Stefano Viaggiu | Stefano Viaggiu | Generating anisotropic fluids from vacuum Ernst equations | Version published on IJMPD, title changed by the review | Int.J.Mod.Phys.D19:1783-1795,2010 | 10.1142/S0218271810018025 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting with any stationary axisymmetric vacuum metric, we build anisotropic
fluids. With the help of the Ernst method, the basic equations are derived
together with the expression for the energy-momentum tensor and with the
equation of state compatible with the field equations. The method is presented
by using diff... | [
{
"created": "Fri, 16 Jun 2006 07:08:39 GMT",
"version": "v1"
},
{
"created": "Tue, 31 Aug 2010 12:00:36 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Viaggiu",
"Stefano",
""
]
] | Starting with any stationary axisymmetric vacuum metric, we build anisotropic fluids. With the help of the Ernst method, the basic equations are derived together with the expression for the energy-momentum tensor and with the equation of state compatible with the field equations. The method is presented by using differ... |
1708.05911 | Rodrigo Avalos | Rodrigo Avalos, F\'abio Dahia and Carlos Romero | On the $C^k$-embedding of Lorentzian manifolds in Ricci-flat spaces | null | Journal of Mathematical Physics 59, 052503 (2018) | 10.1063/1.5017492 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we investigate the problem of non-analytic embeddings of
Lorentzian manifolds in Ricci-flat semi-Riemannian spaces. In order to do this,
we first review some relevant results in the area, and then motivate both the
mathematical and physical interest in this problem. We show that any
$n$-dimensional comp... | [
{
"created": "Sat, 19 Aug 2017 23:22:56 GMT",
"version": "v1"
},
{
"created": "Sat, 19 May 2018 01:29:55 GMT",
"version": "v2"
}
] | 2018-05-22 | [
[
"Avalos",
"Rodrigo",
""
],
[
"Dahia",
"Fábio",
""
],
[
"Romero",
"Carlos",
""
]
] | In this paper we investigate the problem of non-analytic embeddings of Lorentzian manifolds in Ricci-flat semi-Riemannian spaces. In order to do this, we first review some relevant results in the area, and then motivate both the mathematical and physical interest in this problem. We show that any $n$-dimensional compac... |
gr-qc/9303016 | Carsten Gundlach | Carsten Gundlach | The Isaacson expansion in quantum cosmology | Revtex, 11 journal or 24 preprint pages. REPLACEMENT: A comment on
previous work by Dowker and Laflamme is corrected. Utah preprint
UU-REL-93/3/10 | Phys.Rev.D48:1700-1709,1993 | 10.1103/PhysRevD.48.1700 | null | gr-qc | null | This paper is an application of the ideas of the Born-Oppenheimer (or
slow/fast) approximation in molecular physics and of the Isaacson (or
short-wave) approximation in classical gravity to the canonical quantization of
a perturbed minisuperspace model of the kind examined by Halliwell and Hawking.
Its aim is the cla... | [
{
"created": "Wed, 10 Mar 1993 23:35:39 GMT",
"version": "v1"
},
{
"created": "Thu, 8 Apr 1993 00:03:10 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Gundlach",
"Carsten",
""
]
] | This paper is an application of the ideas of the Born-Oppenheimer (or slow/fast) approximation in molecular physics and of the Isaacson (or short-wave) approximation in classical gravity to the canonical quantization of a perturbed minisuperspace model of the kind examined by Halliwell and Hawking. Its aim is the clari... |
2405.03510 | Karol Urba\'nski | Karol Urba\'nski (Szko{\l}a Doktorska Nauk \'Scis{\l}ych i
Przyrodniczych, Jagiellonian University) | Prolonging The Inevitable: Maximising survival time of an
engine-equipped spacecraft between spatial hypersurfaces, as applied to the
Schwarzschild spacetime | 28 pages, 11 figures, preprint | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The fate of an astronaut unfortunate -- or foolish -- enough to find
themselves hurtling towards spaghettification after passing the event horizon
of a black hole is a common anecdote told by scientists to the regular
population. However, despite the fact the Schwarzschild spacetime has been
discovered over a century... | [
{
"created": "Mon, 6 May 2024 14:23:29 GMT",
"version": "v1"
},
{
"created": "Tue, 7 May 2024 14:06:56 GMT",
"version": "v2"
}
] | 2024-05-08 | [
[
"Urbański",
"Karol",
"",
"Szkoła Doktorska Nauk Ścisłych i\n Przyrodniczych, Jagiellonian University"
]
] | The fate of an astronaut unfortunate -- or foolish -- enough to find themselves hurtling towards spaghettification after passing the event horizon of a black hole is a common anecdote told by scientists to the regular population. However, despite the fact the Schwarzschild spacetime has been discovered over a century a... |
gr-qc/0012081 | Burkhard Kleihaus | B. Kleihaus (University College, Dublin) and J. Kunz (University
Oldenburg) | Rotating Hairy Black Holes | 13 pages, including 4 eps figures, LaTex format | Phys.Rev.Lett. 86 (2001) 3704-3707 | 10.1103/PhysRevLett.86.3704 | null | gr-qc | null | We construct stationary black holes in SU(2) Einstein-Yang-Mills theory,
which carry angular momentum and electric charge. Possessing non-trivial
non-abelian magnetic fields outside their regular event horizon, they represent
non-perturbative rotating hairy black holes.
| [
{
"created": "Wed, 20 Dec 2000 16:03:42 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Kleihaus",
"B.",
"",
"University College, Dublin"
],
[
"Kunz",
"J.",
"",
"University\n Oldenburg"
]
] | We construct stationary black holes in SU(2) Einstein-Yang-Mills theory, which carry angular momentum and electric charge. Possessing non-trivial non-abelian magnetic fields outside their regular event horizon, they represent non-perturbative rotating hairy black holes. |
0906.2162 | Federico Urban | Federico R. Urban and Ariel R. Zhitnitsky | The cosmological constant from the QCD Veneziano ghost | 4 pages, uses revtex4, v2 as published | Phys.Lett.B688:9-12,2010 | 10.1016/j.physletb.2010.03.080 | null | gr-qc astro-ph.CO hep-lat hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest that the solution to the cosmological vacuum energy puzzle is
linked to the infrared sector of the effective theory of gravity interacting
with standard model fields, with QCD fields specifically. We work in the
framework of low energy quantum gravity as an effective field theory. In
particular, we compute... | [
{
"created": "Thu, 11 Jun 2009 17:26:33 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Apr 2010 15:49:01 GMT",
"version": "v2"
}
] | 2010-05-12 | [
[
"Urban",
"Federico R.",
""
],
[
"Zhitnitsky",
"Ariel R.",
""
]
] | We suggest that the solution to the cosmological vacuum energy puzzle is linked to the infrared sector of the effective theory of gravity interacting with standard model fields, with QCD fields specifically. We work in the framework of low energy quantum gravity as an effective field theory. In particular, we compute t... |
1704.06151 | Tien-Tien Yu | Vitor Cardoso, Paolo Pani, Tien-Tien Yu | Superradiance in rotating stars and pulsar-timing constraints on dark
photons | 13 pages, 4 figures | Phys. Rev. D 95, 124056 (2017) | 10.1103/PhysRevD.95.124056 | null | gr-qc astro-ph.CO hep-ph physics.class-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the presence of massive bosonic degrees of freedom, rotational
superradiance can trigger an instability that spins down black holes. This
leads to peculiar gravitational-wave signatures and distribution in the
spin-mass plane, which in turn can impose stringent constraints on ultralight
fields. Here, we demonstrat... | [
{
"created": "Tue, 18 Apr 2017 18:00:03 GMT",
"version": "v1"
}
] | 2017-07-05 | [
[
"Cardoso",
"Vitor",
""
],
[
"Pani",
"Paolo",
""
],
[
"Yu",
"Tien-Tien",
""
]
] | In the presence of massive bosonic degrees of freedom, rotational superradiance can trigger an instability that spins down black holes. This leads to peculiar gravitational-wave signatures and distribution in the spin-mass plane, which in turn can impose stringent constraints on ultralight fields. Here, we demonstrate ... |
1707.05011 | Julio Fernando Abalos | Fernando Abalos | A necessary condition for strong hyperbolicity of general first order
systems | null | null | 10.1142/S0219891619500073 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study strong hyperbolicity of first order partial differential equations
for systems with differential constraints. In these cases, the number of
equations is larger than the unknown fields, therefore, the standard Kreiss
necessary and sufficient conditions of strong hyperbolicity do not directly
apply. To deal wi... | [
{
"created": "Mon, 17 Jul 2017 06:36:19 GMT",
"version": "v1"
}
] | 2021-11-17 | [
[
"Abalos",
"Fernando",
""
]
] | We study strong hyperbolicity of first order partial differential equations for systems with differential constraints. In these cases, the number of equations is larger than the unknown fields, therefore, the standard Kreiss necessary and sufficient conditions of strong hyperbolicity do not directly apply. To deal with... |
0901.0261 | Farook Rahaman | F.Rahaman, S.Mal and M. Kalam | Vacuumless topological defects in Lyra geometry | 14 pages, 9 figures. To appear in Astrophys.Space.Sci | Astrophys.Space Sci.319:169-175,2009 | 10.1007/s10509-009-9979-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Few years ago, Cho and Vilenkin have proposed that topological defects can
arise in symmetry breaking models without having degenerate vacua. These types
of defects are known as vacuumless defects. In the present work, the
gravitational field of a vacuumless global string and global monopole have been
investigated in... | [
{
"created": "Fri, 2 Jan 2009 17:47:41 GMT",
"version": "v1"
}
] | 2009-11-18 | [
[
"Rahaman",
"F.",
""
],
[
"Mal",
"S.",
""
],
[
"Kalam",
"M.",
""
]
] | Few years ago, Cho and Vilenkin have proposed that topological defects can arise in symmetry breaking models without having degenerate vacua. These types of defects are known as vacuumless defects. In the present work, the gravitational field of a vacuumless global string and global monopole have been investigated in t... |
1902.04504 | Geoffrey Comp\`ere | Geoffrey Comp\`ere | Are quantum corrections on horizon scale physically motivated? | 16 pages, 8 figures. v3: published version | null | 10.1142/S0218271819300192 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The aim of this short review is to give an overview to non-specialists of
recent arguments from fundamental physics in favor and disfavor of quantum
corrections to black hole horizons. I will mainly discuss the black hole
information paradox, its possible resolutions and shortly address its relevance
or irrelevance t... | [
{
"created": "Tue, 12 Feb 2019 17:12:19 GMT",
"version": "v1"
},
{
"created": "Wed, 20 Feb 2019 08:49:45 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Jul 2019 22:16:16 GMT",
"version": "v3"
}
] | 2020-01-08 | [
[
"Compère",
"Geoffrey",
""
]
] | The aim of this short review is to give an overview to non-specialists of recent arguments from fundamental physics in favor and disfavor of quantum corrections to black hole horizons. I will mainly discuss the black hole information paradox, its possible resolutions and shortly address its relevance or irrelevance to ... |
1608.05223 | Gabriele Gionti S.J. | Gabriele Gionti, S.J | O(d,d) duality transformations in F(R) theories of gravity | 6 pages ,contribution to the proceedings of the 14th Marcel Grossmann
Meeting , Rome 12-18 July 2015 | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The argument of Hodge duality symmetry is introduced starting from the
electromagnetic field. Introducing bosonic string theory, O(d,d) duality
symmetry can be implemented when there exist d-symmetries, which allows one to
write Hodge-dual fields. A tree-level effective gravitational action of bosonic
string theory c... | [
{
"created": "Thu, 18 Aug 2016 10:10:12 GMT",
"version": "v1"
}
] | 2016-08-19 | [
[
"Gionti",
"Gabriele",
""
],
[
"J",
"S.",
""
]
] | The argument of Hodge duality symmetry is introduced starting from the electromagnetic field. Introducing bosonic string theory, O(d,d) duality symmetry can be implemented when there exist d-symmetries, which allows one to write Hodge-dual fields. A tree-level effective gravitational action of bosonic string theory cou... |
1712.01326 | Itzhak Bars | Ignacio J. Araya and Itzhak Bars | Extended Rindler Spacetime and a New Multiverse Structure | 61 pages, 11 figures. Version 2 adds a new section VI and includes
minor corrections | Phys. Rev. D 97, 085009 (2018) | 10.1103/PhysRevD.97.085009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is the first of a series of papers in which we use analyticity
properties of quantum fields propagating on a spacetime to uncover a new
multiverse geometry when the classical geometry has horizons and/or
singularities. The nature and origin of the multiverse idea presented in this
paper, that is shared by the fi... | [
{
"created": "Mon, 4 Dec 2017 20:10:22 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Mar 2018 23:30:55 GMT",
"version": "v2"
}
] | 2018-04-18 | [
[
"Araya",
"Ignacio J.",
""
],
[
"Bars",
"Itzhak",
""
]
] | This is the first of a series of papers in which we use analyticity properties of quantum fields propagating on a spacetime to uncover a new multiverse geometry when the classical geometry has horizons and/or singularities. The nature and origin of the multiverse idea presented in this paper, that is shared by the fiel... |
1701.04910 | Takeshi Chiba | Takeshi Chiba, Masashi Kimura | A Note on Geodesics in Hayward Metric | 14 pages, 10 figures, typos corrected, to appear in PTEP | PTEP 2017 (2017) 4, 043E01 | 10.1093/ptep/ptx037 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study timelike and null geodesics in a non-singular black hole metric
proposed by Hayward. The metric contains an additional length-scale parameter
$\ell$ and approaches the Schwarzschild metric at large radii while approaches
a constant at small radii so that the singularity is resolved. We tabulate the
various c... | [
{
"created": "Wed, 18 Jan 2017 00:59:41 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Mar 2017 04:22:20 GMT",
"version": "v2"
},
{
"created": "Mon, 3 Apr 2017 01:28:03 GMT",
"version": "v3"
}
] | 2017-05-10 | [
[
"Chiba",
"Takeshi",
""
],
[
"Kimura",
"Masashi",
""
]
] | We study timelike and null geodesics in a non-singular black hole metric proposed by Hayward. The metric contains an additional length-scale parameter $\ell$ and approaches the Schwarzschild metric at large radii while approaches a constant at small radii so that the singularity is resolved. We tabulate the various cri... |
2307.04141 | Yu Zhang | Qian Li, Chen Ma, Yu Zhang, Zhi-Wen Lin, Peng-Fei Duan | Gray-body factor and absorption of the Dirac field in ESTGB gravity | 11 pages, 7 figures | Chinese Journal of Physics 77 (2022) 1269-1277 | 10.1016/j.cjph.2022.03.027 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gray-body factor and the absorption cross section of the 4D ESTGB gravity
with a mode of nonlinear electrodynamics for the massless Dirac field are
studied in this paper. The magnetic charge value varies between
$-2^{(\frac{5}{3})}/3$ and $0$ as well as the ADM mass is set to $1$, which
corresponds to a non-extre... | [
{
"created": "Sun, 9 Jul 2023 10:05:39 GMT",
"version": "v1"
}
] | 2023-07-11 | [
[
"Li",
"Qian",
""
],
[
"Ma",
"Chen",
""
],
[
"Zhang",
"Yu",
""
],
[
"Lin",
"Zhi-Wen",
""
],
[
"Duan",
"Peng-Fei",
""
]
] | The gray-body factor and the absorption cross section of the 4D ESTGB gravity with a mode of nonlinear electrodynamics for the massless Dirac field are studied in this paper. The magnetic charge value varies between $-2^{(\frac{5}{3})}/3$ and $0$ as well as the ADM mass is set to $1$, which corresponds to a non-extreme... |
2311.18493 | Salvatore Mignemi | S. Mignemi | Dyonic black holes in Kaluza-Klein theory with a Gauss-Bonnet action | 8 pages | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We consider a five-dimensional Einstein-Gauss-Bonnet model, which gives rise
after dimensional reduction to Einstein gravity nonminimally coupled to
nonlinear electrodynamics. The black hole solutions of the four-dimensional
model modify the Reissner-Nordstrom solutions of general relativity. The
gravitational field ... | [
{
"created": "Thu, 30 Nov 2023 12:07:47 GMT",
"version": "v1"
}
] | 2023-12-01 | [
[
"Mignemi",
"S.",
""
]
] | We consider a five-dimensional Einstein-Gauss-Bonnet model, which gives rise after dimensional reduction to Einstein gravity nonminimally coupled to nonlinear electrodynamics. The black hole solutions of the four-dimensional model modify the Reissner-Nordstrom solutions of general relativity. The gravitational field pr... |
gr-qc/0409038 | Dejan Stojkovic | Dejan Stojkovic | Energy flux through the horizon in the black hole-domain wall systems | references added, accepted for publication in JHEP | JHEP 0409:061,2004 | 10.1088/1126-6708/2004/09/061 | null | gr-qc astro-ph hep-th | null | We study various configurations in which a domain wall (or cosmic string),
described by the Nambu-Goto action, is embedded in a background space-time of a
black hole in $(3+1)$ and higher dimensional models. We calculate energy fluxes
through the black hole horizon. In the simplest case, when a static domain wall
ent... | [
{
"created": "Wed, 8 Sep 2004 17:34:10 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Oct 2004 13:35:57 GMT",
"version": "v2"
}
] | 2010-11-19 | [
[
"Stojkovic",
"Dejan",
""
]
] | We study various configurations in which a domain wall (or cosmic string), described by the Nambu-Goto action, is embedded in a background space-time of a black hole in $(3+1)$ and higher dimensional models. We calculate energy fluxes through the black hole horizon. In the simplest case, when a static domain wall enter... |
1403.5243 | Ricardo Lopez-Fernandez Dr. | Tonatiuh Matos and Ricardo Lopez-Fernandez | A SM Singlet Scalar as Dark Matter | 5 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we investigate the possibility that a simple extension of the
Standard Model (SM) can be the dark matter of the universe. We postulate the
existence of a scalar field singlet like the Higgs as an extra term in the SM
Lagrangian. We find that from the astrophysical point of view a very small mass
and self... | [
{
"created": "Thu, 20 Mar 2014 19:35:05 GMT",
"version": "v1"
}
] | 2014-03-21 | [
[
"Matos",
"Tonatiuh",
""
],
[
"Lopez-Fernandez",
"Ricardo",
""
]
] | In this work we investigate the possibility that a simple extension of the Standard Model (SM) can be the dark matter of the universe. We postulate the existence of a scalar field singlet like the Higgs as an extra term in the SM Lagrangian. We find that from the astrophysical point of view a very small mass and self-i... |
2107.11915 | Martin Lesourd Mr | Martin Lesourd and Eric Ling | Topological censorship in spacetimes compatible with $\Lambda > 0$ | Comments are welcome | null | 10.1007/s00023-022-01200-1 | null | gr-qc math.DG | http://creativecommons.org/publicdomain/zero/1.0/ | Currently available topological censorship theorems are meant for
gravitationally isolated black hole spacetimes with cosmological constant
$\Lambda=0$ or $\Lambda<0$. Here, we prove a topological censorship theorem
that is compatible with $\Lambda>0$ and which can be applied to whole universes
containing possibly mu... | [
{
"created": "Mon, 26 Jul 2021 00:39:45 GMT",
"version": "v1"
},
{
"created": "Wed, 3 Nov 2021 23:12:13 GMT",
"version": "v2"
}
] | 2022-11-30 | [
[
"Lesourd",
"Martin",
""
],
[
"Ling",
"Eric",
""
]
] | Currently available topological censorship theorems are meant for gravitationally isolated black hole spacetimes with cosmological constant $\Lambda=0$ or $\Lambda<0$. Here, we prove a topological censorship theorem that is compatible with $\Lambda>0$ and which can be applied to whole universes containing possibly mult... |
0807.4542 | Johan Brannlund | J Brannlund, A Coley, S Hervik | Supersymmetry, holonomy and Kundt spacetimes | 14 pages. Accepted by Class. Quant. Grav. Some misprints fixed | Class.Quant.Grav.25:195007,2008 | 10.1088/0264-9381/25/19/195007 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Supersymmetric solutions of supergravity theories, and consequently metrics
with special holonomy, have played an important role in the development of
string theory. We describe how a Lorentzian manifold is either completely
reducible, and thus essentially known, or not completely reducible so that
there exists a deg... | [
{
"created": "Mon, 28 Jul 2008 20:44:53 GMT",
"version": "v1"
},
{
"created": "Thu, 31 Jul 2008 01:00:14 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Brannlund",
"J",
""
],
[
"Coley",
"A",
""
],
[
"Hervik",
"S",
""
]
] | Supersymmetric solutions of supergravity theories, and consequently metrics with special holonomy, have played an important role in the development of string theory. We describe how a Lorentzian manifold is either completely reducible, and thus essentially known, or not completely reducible so that there exists a degen... |
gr-qc/0211021 | Edward Anderson | Julian Barbour | Scale-Invariant Gravity: Particle Dynamics | 28 pages. Published version (minor changes from previous version) | Class.Quant.Grav. 20 (2003) 1543-1570 | 10.1088/0264-9381/20/8/310 | null | gr-qc | null | A new and universal method for implementing scale invariance, called best
matching, is presented. It extends to scaling the method introduced by Bertotti
and the author to create a fully relational dynamics that satisfies Mach's
principle. The method is illustrated here in the context of non-relativistic
gravitationa... | [
{
"created": "Wed, 6 Nov 2002 20:43:56 GMT",
"version": "v1"
},
{
"created": "Fri, 2 May 2003 20:35:49 GMT",
"version": "v2"
}
] | 2017-08-23 | [
[
"Barbour",
"Julian",
""
]
] | A new and universal method for implementing scale invariance, called best matching, is presented. It extends to scaling the method introduced by Bertotti and the author to create a fully relational dynamics that satisfies Mach's principle. The method is illustrated here in the context of non-relativistic gravitational ... |
0804.1360 | Larry Ford | Carlos H. G. Bessa, Valdir B. Bezerra and L. H. Ford | Brownian Motion in Robertson-Walker Space-Times from electromagnetic
Vacuum Fluctuations | 29 pages, 7 figures | J.Math.Phys.50:062501,2009 | 10.1063/1.3133946 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider classical particles coupled to the quantized electromagnetic
field in the background of a spatially flat Robertson-Walker universe. We find
that these particles typically undergo Brownian motion and acquire a non-zero
mean squared velocity which depends upon the scale factor of the universe. This
Brownian... | [
{
"created": "Tue, 8 Apr 2008 20:32:15 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Bessa",
"Carlos H. G.",
""
],
[
"Bezerra",
"Valdir B.",
""
],
[
"Ford",
"L. H.",
""
]
] | We consider classical particles coupled to the quantized electromagnetic field in the background of a spatially flat Robertson-Walker universe. We find that these particles typically undergo Brownian motion and acquire a non-zero mean squared velocity which depends upon the scale factor of the universe. This Brownian m... |
gr-qc/9511074 | Leonid Grishchuk | L. P. Grishchuk | Statistics of the Microwave Background Anisotropies Caused by
Cosmological Perturbations of Quantum-Mechanical Origin | 34 pages, REVTEX 3.0 | null | null | WUGRAV-95-16 | gr-qc astro-ph hep-ph | null | The genuine quantum gravity effects can already be around us. It is likely
that the observed large-angular-scale anisotropies in the microwave background
radiation are induced by cosmological perturbations of quantum-mechanical
origin. Such perturbations are placed in squeezed vacuum quantum states and,
hence, are ch... | [
{
"created": "Mon, 27 Nov 1995 18:04:10 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Grishchuk",
"L. P.",
""
]
] | The genuine quantum gravity effects can already be around us. It is likely that the observed large-angular-scale anisotropies in the microwave background radiation are induced by cosmological perturbations of quantum-mechanical origin. Such perturbations are placed in squeezed vacuum quantum states and, hence, are char... |
1401.6871 | Eugeny Babichev | Eugeny Babichev and Alessandro Fabbri | Stability analysis of black holes in massive gravity: a unified
treatment | 4 pages; v2: matches the published version | Phys. Rev. D 89, 081502 (2014) | 10.1103/PhysRevD.89.081502 | LPT-Orsay-14-20 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the analytic solutions of massive (bi)gravity which can be
written in a simple form using advanced Eddington-Finkelstein coordinates. We
analyse the stability of these solutions against radial perturbations. First we
recover the previously obtained result on the instability of the bidiagonal
bi-Schwarzsch... | [
{
"created": "Mon, 27 Jan 2014 14:48:55 GMT",
"version": "v1"
},
{
"created": "Wed, 9 Apr 2014 09:00:52 GMT",
"version": "v2"
}
] | 2014-04-23 | [
[
"Babichev",
"Eugeny",
""
],
[
"Fabbri",
"Alessandro",
""
]
] | We consider the analytic solutions of massive (bi)gravity which can be written in a simple form using advanced Eddington-Finkelstein coordinates. We analyse the stability of these solutions against radial perturbations. First we recover the previously obtained result on the instability of the bidiagonal bi-Schwarzschil... |
gr-qc/0101034 | Roh Suan Tung | Roh S. Tung | Gravitation as a Super SL(2,C) Gauge Theory | 4 pages, Proceedings of the 9th Marcel Grossmann Meeting, Rome, 2-8
July, 2000 | null | 10.1142/9789812777386_0168 | null | gr-qc hep-th | null | We present a gauge theory of the super SL(2,C) group. The gauge potential is
a connection of the Super SL(2,C) group. A MacDowell-Mansouri type of action is
proposed where the action is quadratic in the Super SL(2,C) curvature and
depends purely on gauge connection. By breaking the symmetry of the Super
SL(2,C) topol... | [
{
"created": "Tue, 9 Jan 2001 23:04:25 GMT",
"version": "v1"
}
] | 2017-08-23 | [
[
"Tung",
"Roh S.",
""
]
] | We present a gauge theory of the super SL(2,C) group. The gauge potential is a connection of the Super SL(2,C) group. A MacDowell-Mansouri type of action is proposed where the action is quadratic in the Super SL(2,C) curvature and depends purely on gauge connection. By breaking the symmetry of the Super SL(2,C) topolog... |
2212.12901 | Guangzhou Guo | Guangzhou Guo, Yuhang Lu, Peng Wang, Houwen Wu and Haitang Yang | Black Holes with Multiple Photon Spheres | 25 pages, 8 figures, references added | null | 10.1103/PhysRevD.107.124037 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, asymptotically-flat black holes with multiple photon spheres have
been discovered and found to produce distinctive observational signatures. In
this paper, we focus on whether these black hole solutions are physically
viable, e.g., satisfying energy conditions of interest. Intriguingly, black
hole and naked... | [
{
"created": "Sun, 25 Dec 2022 13:35:03 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Dec 2022 02:22:57 GMT",
"version": "v2"
},
{
"created": "Thu, 5 Jan 2023 13:41:05 GMT",
"version": "v3"
}
] | 2023-06-28 | [
[
"Guo",
"Guangzhou",
""
],
[
"Lu",
"Yuhang",
""
],
[
"Wang",
"Peng",
""
],
[
"Wu",
"Houwen",
""
],
[
"Yang",
"Haitang",
""
]
] | Recently, asymptotically-flat black holes with multiple photon spheres have been discovered and found to produce distinctive observational signatures. In this paper, we focus on whether these black hole solutions are physically viable, e.g., satisfying energy conditions of interest. Intriguingly, black hole and naked s... |
1605.01989 | Alexey Toporensky | Maria Skugoreva and Alexey Toporensky | Asymptotic cosmological regimes in scalar-torsion gravity with a perfect
fluid | 14 pages with 2 tables and 1 eps figure. Minor changes, published
version | Eur.Phys.J. C76 (2016) no.6, 340 | 10.1140/epjc/s10052-016-4190-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider cosmological dynamics of nonminimally coupled scalar field in the
scalar-torsion gravity in the presence of a hydrodynamical matter. Potential of
the scalar field have been chosen as power-law with negative index, this type
of potentials is usually used in quintessence scenarios. We identify several
asymp... | [
{
"created": "Fri, 6 May 2016 16:12:50 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Jan 2017 14:03:16 GMT",
"version": "v2"
}
] | 2017-01-03 | [
[
"Skugoreva",
"Maria",
""
],
[
"Toporensky",
"Alexey",
""
]
] | We consider cosmological dynamics of nonminimally coupled scalar field in the scalar-torsion gravity in the presence of a hydrodynamical matter. Potential of the scalar field have been chosen as power-law with negative index, this type of potentials is usually used in quintessence scenarios. We identify several asympto... |
2011.14682 | Roberto Dale | R. Dale and D. S\'aez | Spherical symmetric dust collapse in a Vector-Tensor gravity | 22 pages, 1 table | Phys. Rev. D 98, 064007 (2018) | 10.1103/PhysRevD.98.064007 | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | There is a viable vector-tensor gravity (VTG) theory, whose vector field
produces repulsive forces leading to important effects. In the background
universe, the effect of these forces is an accelerated expansion identical to
that produced by vacuum energy (cosmological constant). Here, we prove that
another of these ... | [
{
"created": "Mon, 30 Nov 2020 10:48:23 GMT",
"version": "v1"
}
] | 2020-12-01 | [
[
"Dale",
"R.",
""
],
[
"Sáez",
"D.",
""
]
] | There is a viable vector-tensor gravity (VTG) theory, whose vector field produces repulsive forces leading to important effects. In the background universe, the effect of these forces is an accelerated expansion identical to that produced by vacuum energy (cosmological constant). Here, we prove that another of these ef... |
1802.07371 | Robert R. Caldwell | R. R. Caldwell and C. Devulder | Gravitational Wave Opacity from Gauge Field Dark Energy | 17 pages, 19 figures, revised and clarified text, results unchanged.
V3 minor changes, including additional analysis of opacity effect for 3G
detectors. New version matches published version | Phys. Rev. D 100, 103510 (2019) | 10.1103/PhysRevD.100.103510 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that astrophysical gravitational waves can undergo an anomalous
modulation when propagating through cosmic gauge field dark energy. A
sufficiently strong effect, dependent on the gauge field energy density, would
appear as a redshift-dependent opacity, thereby impacting the use of
gravitational wave standard ... | [
{
"created": "Tue, 20 Feb 2018 23:11:58 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Mar 2018 18:10:09 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Dec 2019 02:26:53 GMT",
"version": "v3"
}
] | 2019-12-17 | [
[
"Caldwell",
"R. R.",
""
],
[
"Devulder",
"C.",
""
]
] | We show that astrophysical gravitational waves can undergo an anomalous modulation when propagating through cosmic gauge field dark energy. A sufficiently strong effect, dependent on the gauge field energy density, would appear as a redshift-dependent opacity, thereby impacting the use of gravitational wave standard si... |
1602.02687 | Kofinas Georgios | Georgios Kofinas, Eleftherios Papantonopoulos, Emmanuel N. Saridakis | Modified Brans-Dicke cosmology with matter-scalar field interaction | Minor changes | null | 10.1088/0264-9381/33/15/155004 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the cosmological implications of an extended Brans-Dicke theory
presented recently, in which there is an energy exchange between the scalar
field and ordinary matter, determined by the theory. A new mass scale is
generated in the theory which modifies the Friedmann equations with
field-dependent corrected ... | [
{
"created": "Mon, 8 Feb 2016 18:36:43 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Mar 2016 10:27:53 GMT",
"version": "v2"
},
{
"created": "Fri, 17 Jun 2016 09:58:19 GMT",
"version": "v3"
},
{
"created": "Wed, 6 Jul 2016 20:43:03 GMT",
"version": "v4"
},
{
"cre... | 2016-11-30 | [
[
"Kofinas",
"Georgios",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We discuss the cosmological implications of an extended Brans-Dicke theory presented recently, in which there is an energy exchange between the scalar field and ordinary matter, determined by the theory. A new mass scale is generated in the theory which modifies the Friedmann equations with field-dependent corrected ki... |
2211.15151 | Di Wu | Di Wu | Topological classes of rotating black holes | 6 pages, 6 figures, 1 table, revtex4-1.cls, to appear in PRD | Phys. Rev. D 107, 024024 (2023) | 10.1103/PhysRevD.107.024024 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we investigate the topological numbers for singly rotating
Kerr black holes in arbitrary dimensions and four-dimensional Kerr-Newman black
hole. We show that for uncharged black holes, the rotation parameter has a
significant effect on the topological number, and for rotating black holes, the
dimension... | [
{
"created": "Mon, 28 Nov 2022 09:03:10 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Nov 2022 07:58:12 GMT",
"version": "v2"
},
{
"created": "Sat, 14 Jan 2023 03:15:48 GMT",
"version": "v3"
}
] | 2023-01-20 | [
[
"Wu",
"Di",
""
]
] | In this paper, we investigate the topological numbers for singly rotating Kerr black holes in arbitrary dimensions and four-dimensional Kerr-Newman black hole. We show that for uncharged black holes, the rotation parameter has a significant effect on the topological number, and for rotating black holes, the dimension o... |
gr-qc/0003080 | Martin Goliath | Alan Coley and Martin Goliath | Self-similar spherically symmetric cosmological models with a perfect
fluid and a scalar field | 31 pages, 4 figures | Class.Quant.Grav.17:2557-2588,2000 | 10.1088/0264-9381/17/13/309 | null | gr-qc | null | Self-similar, spherically symmetric cosmological models with a perfect fluid
and a scalar field with an exponential potential are investigated. New
variables are defined which lead to a compact state space, and dynamical
systems methods are utilised to analyse the models. Due to the existence of
monotone functions gl... | [
{
"created": "Mon, 20 Mar 2000 09:22:55 GMT",
"version": "v1"
}
] | 2010-11-19 | [
[
"Coley",
"Alan",
""
],
[
"Goliath",
"Martin",
""
]
] | Self-similar, spherically symmetric cosmological models with a perfect fluid and a scalar field with an exponential potential are investigated. New variables are defined which lead to a compact state space, and dynamical systems methods are utilised to analyse the models. Due to the existence of monotone functions glob... |
2004.09384 | Shintaro Nakamura | Antonio De Felice, Shintaro Nakamura, Shinji Tsujikawa | Suppressed cosmic growth in coupled vector-tensor theories | 25 pages, 3 figures | Phys. Rev. D 102, 063531 (2020) | 10.1103/PhysRevD.102.063531 | YITP-20-56, WUCG-20-02 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a coupled dark energy scenario in which a massive vector field
$A_{\mu}$ with broken $U(1)$ gauge symmetry interacts with the four-velocity
$u_c^{\mu}$ of cold dark matter (CDM) through the scalar product $Z=-u_c^{\mu}
A_{\mu}$. This new coupling corresponds to the momentum transfer, so that the
background v... | [
{
"created": "Mon, 20 Apr 2020 15:35:26 GMT",
"version": "v1"
},
{
"created": "Sun, 27 Sep 2020 07:40:54 GMT",
"version": "v2"
}
] | 2020-09-29 | [
[
"De Felice",
"Antonio",
""
],
[
"Nakamura",
"Shintaro",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We study a coupled dark energy scenario in which a massive vector field $A_{\mu}$ with broken $U(1)$ gauge symmetry interacts with the four-velocity $u_c^{\mu}$ of cold dark matter (CDM) through the scalar product $Z=-u_c^{\mu} A_{\mu}$. This new coupling corresponds to the momentum transfer, so that the background vec... |
2209.02330 | Davide Batic | Davide Batic, Joud Mojahed Faraji, Marek Nowakowski | Possible Connection between Dark Matter and Supermassive Black Holes | 23 pages, 19 figures, 13 tables | The European Physical Journal C volume 82, Article number: 759
(2022) | 10.1140/epjc/s10052-022-10731-0 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Dark Matter (DM) is usually studied in connection with rotational curves in
the outskirts of the galaxies. However, the role of DM might be different in
the galactic bulges and centers where Supermassive Black Holes (SMBHs) dominate
the gravitational interaction. Indeed, given the fact that DM is the dominant
matter ... | [
{
"created": "Tue, 6 Sep 2022 09:39:15 GMT",
"version": "v1"
}
] | 2022-09-07 | [
[
"Batic",
"Davide",
""
],
[
"Faraji",
"Joud Mojahed",
""
],
[
"Nowakowski",
"Marek",
""
]
] | Dark Matter (DM) is usually studied in connection with rotational curves in the outskirts of the galaxies. However, the role of DM might be different in the galactic bulges and centers where Supermassive Black Holes (SMBHs) dominate the gravitational interaction. Indeed, given the fact that DM is the dominant matter sp... |
0908.2895 | Haryanto Siahaan | Haryanto M. Siahaan and Triyanta | Semiclassical Methods for Hawking Radiation from a Vaidya Black Hole | REVTeX 4, 11 pages, no figures, accepted for publication in IJMPA;
v2: eq.5 is corrected | Int.J.Mod.Phys.A25:145-153,2010 | 10.1142/S0217751X1004749X | null | gr-qc hep-th | http://creativecommons.org/licenses/by/3.0/ | We derive the general form of Hawking temperature for Vaidya black hole in
the tunneling pictures. This kind of black hole is regarded as the description
of a more realistic one since it's time dependent decreasing mass due to the
evaporation process. Clearly, the temperature would be time dependent as our
findings. ... | [
{
"created": "Thu, 20 Aug 2009 10:10:21 GMT",
"version": "v1"
},
{
"created": "Fri, 24 Jun 2011 15:36:45 GMT",
"version": "v2"
}
] | 2011-06-27 | [
[
"Siahaan",
"Haryanto M.",
""
],
[
"Triyanta",
"",
""
]
] | We derive the general form of Hawking temperature for Vaidya black hole in the tunneling pictures. This kind of black hole is regarded as the description of a more realistic one since it's time dependent decreasing mass due to the evaporation process. Clearly, the temperature would be time dependent as our findings. We... |
1807.11779 | James Read | James Read and Nicholas Teh | The Teleparallel Equivalent of Newton-Cartan Gravity | 7 pages, forthcoming in Classical and Quantum Gravity (letters) | null | 10.1088/1361-6382/aad70d | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct a notion of teleparallelization for Newton-Cartan theory, and
show that the teleparallel equivalent of this theory is Newtonian gravity;
furthermore, we show that this result is consistent with teleparallelization in
general relativity, and can be obtained by null-reducing the teleparallel
equivalent of ... | [
{
"created": "Tue, 31 Jul 2018 12:05:01 GMT",
"version": "v1"
}
] | 2018-08-29 | [
[
"Read",
"James",
""
],
[
"Teh",
"Nicholas",
""
]
] | We construct a notion of teleparallelization for Newton-Cartan theory, and show that the teleparallel equivalent of this theory is Newtonian gravity; furthermore, we show that this result is consistent with teleparallelization in general relativity, and can be obtained by null-reducing the teleparallel equivalent of a ... |
1111.2177 | Zhoujian Cao Dr | Zhoujian Cao, David Hilditch | Numerical stability of the Z4c formulation of general relativity | submitted to PRD | Phys. Rev. D 85, 124032 (2012) | 10.1103/PhysRevD.85.124032 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study numerical stability of different approaches to the discretization of
a conformal decomposition of the Z4 formulation of general relativity. We
demonstrate that in the linear, constant coefficient regime a novel
discretization for tensors is formally numerically stable with a method of
lines time-integrator. ... | [
{
"created": "Wed, 9 Nov 2011 11:33:57 GMT",
"version": "v1"
}
] | 2013-01-08 | [
[
"Cao",
"Zhoujian",
""
],
[
"Hilditch",
"David",
""
]
] | We study numerical stability of different approaches to the discretization of a conformal decomposition of the Z4 formulation of general relativity. We demonstrate that in the linear, constant coefficient regime a novel discretization for tensors is formally numerically stable with a method of lines time-integrator. We... |
gr-qc/0111083 | Guest User | G. S. Khadekar and Shilpa Samdurkar (Nagpur University, Nagpur, India) | Multidimensional Homogeneous Cosmological Models in Wesson Theory of
Gravitation | latex 4 pages, no figure | null | null | null | gr-qc | null | Higher dimensional solutions are obtained for a homogeneous, spatially
isotropic cosmological model in Wesson theory of gravitation. Some cosmological
parameter are also calculated for this model.
| [
{
"created": "Sun, 25 Nov 2001 18:35:57 GMT",
"version": "v1"
},
{
"created": "Tue, 27 Nov 2001 18:03:34 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Khadekar",
"G. S.",
"",
"Nagpur University, Nagpur, India"
],
[
"Samdurkar",
"Shilpa",
"",
"Nagpur University, Nagpur, India"
]
] | Higher dimensional solutions are obtained for a homogeneous, spatially isotropic cosmological model in Wesson theory of gravitation. Some cosmological parameter are also calculated for this model. |
2308.00111 | Marcell Howard | Tatsuya Daniel, Marcell Howard, and Morgane K\"onig | An SZ-Like Effect on Cosmological Gravitational Wave Backgrounds | 29 pages, 3 figures, Submitted to JCAP; Updated draft commensurate
with published version: 30 pages, 3 figures | JCAP12(2023)041 | 10.1088/1475-7516/2023/12/041 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cosmological gravitational wave backgrounds (CGWBs) are the conglomeration of
unresolved gravitational wave signals from early Universe sources, which make
them a promising tool for cosmologists. Because gravitons decouple from the
cosmic plasma early on, one can consider interactions between gravitons and any
partic... | [
{
"created": "Mon, 31 Jul 2023 19:30:53 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Dec 2023 04:07:27 GMT",
"version": "v2"
}
] | 2023-12-27 | [
[
"Daniel",
"Tatsuya",
""
],
[
"Howard",
"Marcell",
""
],
[
"König",
"Morgane",
""
]
] | Cosmological gravitational wave backgrounds (CGWBs) are the conglomeration of unresolved gravitational wave signals from early Universe sources, which make them a promising tool for cosmologists. Because gravitons decouple from the cosmic plasma early on, one can consider interactions between gravitons and any particle... |
gr-qc/9611044 | Max Banados | Maximo Banados and Andres Gomberoff | Black Hole Entropy in the Chern-Simons Formulation of 2+1 Gravity | 6 pages, RevTeX, minor changes. Old title "Some remarks on Carlip's
derivation of the 2+1 black hole entropy". Version to appear in Phys. Rev. D | Phys.Rev.D55:6162-6167,1997 | 10.1103/PhysRevD.55.6162 | null | gr-qc hep-th | null | We examine Carlip's derivation of the 2+1 Minkowskian black hole entropy. A
simplified derivation of the boundary action -valid for any value of the level
k- is given.
| [
{
"created": "Thu, 14 Nov 1996 21:32:08 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jan 1997 19:04:09 GMT",
"version": "v2"
}
] | 2011-09-09 | [
[
"Banados",
"Maximo",
""
],
[
"Gomberoff",
"Andres",
""
]
] | We examine Carlip's derivation of the 2+1 Minkowskian black hole entropy. A simplified derivation of the boundary action -valid for any value of the level k- is given. |
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