id stringlengths 9 13 | submitter stringlengths 1 64 ⌀ | authors stringlengths 5 22.9k | title stringlengths 4 245 | comments stringlengths 1 548 ⌀ | journal-ref stringlengths 4 362 ⌀ | doi stringlengths 12 82 ⌀ | report-no stringlengths 2 281 ⌀ | categories stringclasses 793
values | license stringclasses 9
values | orig_abstract stringlengths 24 1.95k | versions listlengths 1 30 | update_date stringlengths 10 10 | authors_parsed listlengths 1 1.74k | abstract stringlengths 21 1.95k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0605053 | Gregory B. Cook | Matthew Caudill, Gregory B. Cook, Jason D. Grigsby, and Harald P.
Pfeiffer | Circular orbits and spin in black-hole initial data | 24 pages, 17 figures, accepted for publication in Physical Review D,
revtex4; Fixed error in computing proper separation and updated figures and
tables accordingly, added reference to Sec. IV.A, fixed minor error in Sec.
IV.B, added new data to Tables IV and V, fixed 1 reference, fixed error in
Eq. (A7b), inclu... | Phys.Rev. D74 (2006) 064011 | 10.1103/PhysRevD.74.064011 | null | gr-qc | null | The construction of initial data for black-hole binaries usually involves the
choice of free parameters that define the spins of the black holes and
essentially the eccentricity of the orbit. Such parameters must be chosen
carefully to yield initial data with the desired physical properties. In this
paper, we examine... | [
{
"created": "Tue, 9 May 2006 21:18:40 GMT",
"version": "v1"
},
{
"created": "Wed, 26 Jul 2006 13:46:20 GMT",
"version": "v2"
},
{
"created": "Fri, 1 Sep 2006 20:29:46 GMT",
"version": "v3"
}
] | 2009-11-11 | [
[
"Caudill",
"Matthew",
""
],
[
"Cook",
"Gregory B.",
""
],
[
"Grigsby",
"Jason D.",
""
],
[
"Pfeiffer",
"Harald P.",
""
]
] | The construction of initial data for black-hole binaries usually involves the choice of free parameters that define the spins of the black holes and essentially the eccentricity of the orbit. Such parameters must be chosen carefully to yield initial data with the desired physical properties. In this paper, we examine t... |
1712.00873 | Gautam Satishchandran | Gautam Satishchandran, Robert M. Wald | Memory Effect for Particle Scattering in Odd Spacetime Dimensions | 20 pages, 2 figures; minor changes | Phys. Rev. D 97, 024036 (2018) | 10.1103/PhysRevD.97.024036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the gravitational memory effect for linearized perturbations
off of Minkowski space in odd spacetime dimensions $d$ by examining the effects
of gravitational radiation from classical point particle scattering. We also
investigate analogous memory effects for electromagnetic and scalar radiation.
We fin... | [
{
"created": "Mon, 4 Dec 2017 01:58:41 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Feb 2018 00:29:34 GMT",
"version": "v2"
}
] | 2018-02-07 | [
[
"Satishchandran",
"Gautam",
""
],
[
"Wald",
"Robert M.",
""
]
] | We investigate the gravitational memory effect for linearized perturbations off of Minkowski space in odd spacetime dimensions $d$ by examining the effects of gravitational radiation from classical point particle scattering. We also investigate analogous memory effects for electromagnetic and scalar radiation. We find ... |
gr-qc/0611133 | Farook Rahaman | F.Rahaman, M.Kalam, M.Sarker, A.Ghosh and B.Raychaudhuri | Wormhole with varying cosmological constant | 8 pages, 2 figures, Accepted in Gen. Rel. Grav | Gen.Rel.Grav.39:145-151,2007 | 10.1007/s10714-006-0380-4 | null | gr-qc | null | It has been suggested that the cosmological constant is a variable dynamical
quantity. A class of solution has been presented for the spherically symmetric
space time describing wormholes by assuming the erstwhile cosmological constant
$\Lambda$ to be a space variable scalar, viz., $\Lambda$ = $\Lambda (r) $ . It
is ... | [
{
"created": "Sat, 25 Nov 2006 08:46:56 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Rahaman",
"F.",
""
],
[
"Kalam",
"M.",
""
],
[
"Sarker",
"M.",
""
],
[
"Ghosh",
"A.",
""
],
[
"Raychaudhuri",
"B.",
""
]
] | It has been suggested that the cosmological constant is a variable dynamical quantity. A class of solution has been presented for the spherically symmetric space time describing wormholes by assuming the erstwhile cosmological constant $\Lambda$ to be a space variable scalar, viz., $\Lambda$ = $\Lambda (r) $ . It is sh... |
1102.4357 | Michele Fontanini | Michele Fontanini and Mark Trodden | Tackling Higher Derivative Ghosts with the Euclidean Path Integral | 21 pages | Phys.Rev.D83:103518,2011 | 10.1103/PhysRevD.83.103518 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An alternative to the effective field theory approach to treat ghosts in
higher derivative theories is to attempt to integrate them out via the
Euclidean path integral formalism. It has been suggested that this method could
provide a consistent framework within which we might tolerate the ghost degrees
of freedom tha... | [
{
"created": "Mon, 21 Feb 2011 22:00:42 GMT",
"version": "v1"
}
] | 2011-05-25 | [
[
"Fontanini",
"Michele",
""
],
[
"Trodden",
"Mark",
""
]
] | An alternative to the effective field theory approach to treat ghosts in higher derivative theories is to attempt to integrate them out via the Euclidean path integral formalism. It has been suggested that this method could provide a consistent framework within which we might tolerate the ghost degrees of freedom that ... |
1101.4916 | Edward Anderson | Edward Anderson | On the Semiclassical Approach to Quantum Cosmology | 20 pages, 1 figure | Class. Quant. Grav. 28 185008 (2011) | 10.1088/0264-9381/28/18/185008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The emergent semiclassical time approach to resolving the problem of time in
quantum gravity involves heavy slow degrees of freedom providing via an
approximately Hamilton-Jacobi equation an approximate timestandard with respect
to which the quantum mechanics of light fast degrees of freedom can run. More
concretely,... | [
{
"created": "Tue, 25 Jan 2011 20:19:15 GMT",
"version": "v1"
}
] | 2015-05-27 | [
[
"Anderson",
"Edward",
""
]
] | The emergent semiclassical time approach to resolving the problem of time in quantum gravity involves heavy slow degrees of freedom providing via an approximately Hamilton-Jacobi equation an approximate timestandard with respect to which the quantum mechanics of light fast degrees of freedom can run. More concretely, t... |
0803.2398 | Kourosh Nozari | S. Davood Sadatian and Kourosh Nozari | Crossing of the Phantom Divided Barrier with Lorentz Invariance
Violating Fields | 14 pages, 4 figures, Revised and References added, Accepted for
Publication in Europhysics Letters | Europhys.Lett.82:49001,2008 | 10.1209/0295-5075/82/49001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study possible crossing of the phantom divided barrier in a Lorentz
invariance violating dark energy model. Lorentz invariance violation which is
achieved by introducing a vector field in the action, incorporates directly in
the dynamics of the scalar field and equation of state. This interesting
feature allows us... | [
{
"created": "Mon, 17 Mar 2008 07:10:42 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Apr 2008 08:01:28 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Sadatian",
"S. Davood",
""
],
[
"Nozari",
"Kourosh",
""
]
] | We study possible crossing of the phantom divided barrier in a Lorentz invariance violating dark energy model. Lorentz invariance violation which is achieved by introducing a vector field in the action, incorporates directly in the dynamics of the scalar field and equation of state. This interesting feature allows us t... |
1408.1735 | Koray Duztas | Koray Duztas | Stability of event horizons against neutrino flux: The classical picture | Published version, 11 pages, no figures | Class. Quantum Grav. 32 (2015) 075003 | 10.1088/0264-9381/32/7/075003 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has been claimed that cosmic censorship conjecture can be violated by
quantum tunnelling of neutrinos, though it is strongly supported by classical
arguments. We consider the classical interaction of an extremal Kerr black hole
with a test massless Dirac field, i.e. a "neutrino field". Evaluating the flux
integral... | [
{
"created": "Thu, 7 Aug 2014 23:51:04 GMT",
"version": "v1"
},
{
"created": "Thu, 5 Mar 2015 10:17:09 GMT",
"version": "v2"
}
] | 2015-03-06 | [
[
"Duztas",
"Koray",
""
]
] | It has been claimed that cosmic censorship conjecture can be violated by quantum tunnelling of neutrinos, though it is strongly supported by classical arguments. We consider the classical interaction of an extremal Kerr black hole with a test massless Dirac field, i.e. a "neutrino field". Evaluating the flux integrals ... |
1909.09977 | Yen Chin Ong | Yen Chin Ong | The Charge of Electron, Weak Gravity Conjecture and Black Hole Evolution | 5 pages, 4 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The charge of an electron is vastly larger than its mass. We found that black
hole evolution under Hawking evaporation is very sensitive to the value of
electron charge. If the electron charge is weakened by a mere one order of
magnitude, then the evolutionary paths of Reissner-Nordstr\"om black holes
under Hawking e... | [
{
"created": "Sun, 22 Sep 2019 10:47:51 GMT",
"version": "v1"
}
] | 2019-09-24 | [
[
"Ong",
"Yen Chin",
""
]
] | The charge of an electron is vastly larger than its mass. We found that black hole evolution under Hawking evaporation is very sensitive to the value of electron charge. If the electron charge is weakened by a mere one order of magnitude, then the evolutionary paths of Reissner-Nordstr\"om black holes under Hawking eva... |
gr-qc/0605014 | Alejandro Corichi | Alejandro Corichi, Jacobo Diaz-Polo and Enrique Fernandez-Borja | Quantum geometry and microscopic black hole entropy | 10 pages, Revtex4 file, 7 new figures. Discussion expanded, same
conclusions | Class.Quant.Grav.24:243-251,2007 | 10.1088/0264-9381/24/1/013 | null | gr-qc hep-th | null | Quantum black holes within the loop quantum gravity (LQG) framework are
considered. The number of microscopic states that are consistent with a black
hole of a given horizon area $A_0$ are counted and the statistical entropy, as
a function of the area, is obtained for $A_0$ up to $550 l^2_{\rm Pl}$. The
results are c... | [
{
"created": "Mon, 1 May 2006 22:46:40 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Aug 2006 23:28:37 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Corichi",
"Alejandro",
""
],
[
"Diaz-Polo",
"Jacobo",
""
],
[
"Fernandez-Borja",
"Enrique",
""
]
] | Quantum black holes within the loop quantum gravity (LQG) framework are considered. The number of microscopic states that are consistent with a black hole of a given horizon area $A_0$ are counted and the statistical entropy, as a function of the area, is obtained for $A_0$ up to $550 l^2_{\rm Pl}$. The results are con... |
gr-qc/0201100 | Han-Ying Guo | Xiaoning Wu, Han-Ying Guo, Chao-Guang Huang and Ke Wu | Black Hole Mass Formula Is a Vanishing Noether Charge | 7 pages | null | 10.1088/0253-6102/38/3/309 | null | gr-qc | null | The Noether current and its variation relation with respect to diffeomorphism
invariance of gravitational theories have been derived from the horizontal
variation and vertical-horizontal bi-variation of the Lagrangian, respectively.
For Einstein's GR in the stationary, axisymmetric black holes, the mass formula
in va... | [
{
"created": "Thu, 31 Jan 2002 07:57:59 GMT",
"version": "v1"
}
] | 2018-01-17 | [
[
"Wu",
"Xiaoning",
""
],
[
"Guo",
"Han-Ying",
""
],
[
"Huang",
"Chao-Guang",
""
],
[
"Wu",
"Ke",
""
]
] | The Noether current and its variation relation with respect to diffeomorphism invariance of gravitational theories have been derived from the horizontal variation and vertical-horizontal bi-variation of the Lagrangian, respectively. For Einstein's GR in the stationary, axisymmetric black holes, the mass formula in vacu... |
1409.1751 | Martin Kober | Martin Kober | Canonical Quantum Gravity on Noncommutative Spacetime | 17 pages | Int. J. Mod. Phys. A 30 : 1550085 (2015) | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper canonical quantum gravity on noncommutative space-time is
considered. The corresponding generalized classical theory is formulated by
using the moyal star product, which enables the representation of the field
quantities depending on noncommuting coordinates by generalized quantities
depending on usual ... | [
{
"created": "Thu, 4 Sep 2014 15:09:05 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Sep 2015 19:06:25 GMT",
"version": "v2"
},
{
"created": "Thu, 1 Sep 2016 14:46:26 GMT",
"version": "v3"
}
] | 2016-09-02 | [
[
"Kober",
"Martin",
""
]
] | In this paper canonical quantum gravity on noncommutative space-time is considered. The corresponding generalized classical theory is formulated by using the moyal star product, which enables the representation of the field quantities depending on noncommuting coordinates by generalized quantities depending on usual co... |
1801.08039 | S. Sedigheh Hashemi | S. Sedigheh Hashemi and Nematollah Riazi | Boosted Cylindrical Magnetized Kaluza-Klein Wormhole | 10 pages, 7 figures | General Relativity and Gravitation, (2018) | 10.1007/s10714-018-2343-y | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, we consider a vacuum solution of Kaluza-Klein theory with
cylindrical symmetry. We investigate the physical properties of the solution as
viewed in four dimensional spacetime, which turns out to be a stationary,
cylindrical wormhole supported by a scalar field and a magnetic field oriented
along the wor... | [
{
"created": "Wed, 24 Jan 2018 15:49:46 GMT",
"version": "v1"
}
] | 2018-01-25 | [
[
"Hashemi",
"S. Sedigheh",
""
],
[
"Riazi",
"Nematollah",
""
]
] | In this work, we consider a vacuum solution of Kaluza-Klein theory with cylindrical symmetry. We investigate the physical properties of the solution as viewed in four dimensional spacetime, which turns out to be a stationary, cylindrical wormhole supported by a scalar field and a magnetic field oriented along the wormh... |
2310.19922 | Jorge Pullin | Rodolfo Gambini, Javier Olmedo, Jorge Pullin | Smooth extensions of black holes in loop quantum gravity | 6 pages, RevTex, no figures. To appear in International Journal of
Modern Physics D | International Journal of Modern Physics D 32, 2350101 (2023) | 10.1142/S0218271823501018 | LSU-REL-103023 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Vacuum spherically symmetric loop quantum gravity in the midi-superspace
approximation using inhomogeneous horizon-penetrating slices has been studied
for a decade, and it has been noted that the singularity is eliminated. It is
replaced by a region of high curvature and potentially large quantum
fluctuations. It was... | [
{
"created": "Mon, 30 Oct 2023 18:34:16 GMT",
"version": "v1"
}
] | 2024-02-20 | [
[
"Gambini",
"Rodolfo",
""
],
[
"Olmedo",
"Javier",
""
],
[
"Pullin",
"Jorge",
""
]
] | Vacuum spherically symmetric loop quantum gravity in the midi-superspace approximation using inhomogeneous horizon-penetrating slices has been studied for a decade, and it has been noted that the singularity is eliminated. It is replaced by a region of high curvature and potentially large quantum fluctuations. It was r... |
2311.00311 | Dong-han Yeom | Pisin Chen, Xiao Yan Chew, Misao Sasaki, Dong-han Yeom | Yang-Mills instantons as the end point of black hole evaporation | 17 pages, 5 figures | null | null | YITP-23-70 | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Non-perturbative contributions of the Euclidean path integral are important
to understand the information loss paradox. In this paper, we revisit the
Yang-Mills instantons in the Einstein-Yang-Mills theory. There exists a
globally regular solution that is known as the Bartnik-McKinnon solution and a
black hole soluti... | [
{
"created": "Wed, 1 Nov 2023 05:49:36 GMT",
"version": "v1"
}
] | 2023-11-02 | [
[
"Chen",
"Pisin",
""
],
[
"Chew",
"Xiao Yan",
""
],
[
"Sasaki",
"Misao",
""
],
[
"Yeom",
"Dong-han",
""
]
] | Non-perturbative contributions of the Euclidean path integral are important to understand the information loss paradox. In this paper, we revisit the Yang-Mills instantons in the Einstein-Yang-Mills theory. There exists a globally regular solution that is known as the Bartnik-McKinnon solution and a black hole solution... |
1307.8438 | Daniel M\"uller | Daniel M\"uller | Effective Gravity and Homogeneous Solutions | talk presented at 13th Marcel Grossmann Meeting, Stockholm, 1-7 july
2012 | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Near the singularity, gravity should be modified to an effective theory, in
the same sense as with the Euler-Heisenberg electrodynamics. This effective
gravity surmounts to higher derivative theory, and as is well known, a much
more reacher theory concerning the solution space. On the other hand, as a
highly non line... | [
{
"created": "Wed, 31 Jul 2013 19:40:23 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 2013 12:01:58 GMT",
"version": "v2"
}
] | 2013-08-02 | [
[
"Müller",
"Daniel",
""
]
] | Near the singularity, gravity should be modified to an effective theory, in the same sense as with the Euler-Heisenberg electrodynamics. This effective gravity surmounts to higher derivative theory, and as is well known, a much more reacher theory concerning the solution space. On the other hand, as a highly non linear... |
1911.02937 | Sanved Kolekar | Sanved Kolekar | Directional dependence of the Unruh effect for spatially extended
detectors | 17 pages | Phys. Rev. D 101, 025002 (2020) | 10.1103/PhysRevD.101.025002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the response of a spatially extended direction-dependent local
quantum system, a detector, moving on the Rindler trajectory of uniform linear
acceleration in Minkowski spacetime, and coupled linearly to a quantum scalar
field. We consider two spatial profiles: (i) a profile defined in the
Fermi-Walker fram... | [
{
"created": "Thu, 7 Nov 2019 14:35:54 GMT",
"version": "v1"
}
] | 2020-01-14 | [
[
"Kolekar",
"Sanved",
""
]
] | We analyse the response of a spatially extended direction-dependent local quantum system, a detector, moving on the Rindler trajectory of uniform linear acceleration in Minkowski spacetime, and coupled linearly to a quantum scalar field. We consider two spatial profiles: (i) a profile defined in the Fermi-Walker frame ... |
1411.6096 | Gilberto Medeiros Kremer | Ra\'ila Andr\'e and Gilberto M. Kremer | Collisionless self-gravitating systems in f(R)-gravity within Palatini
approach and relativistic Boltzmann equation in the Newtonian approach | 5 pages, 1 figure, to appear in Gravitation, Relativistic
Astrophysics and Cosmology, Second Argentinian-Brazilian Meeting, 2014, G. S.
Vila, F. L. Vieyro and J. Fabris, eds | Gravitation, Relativistic Astrophysics and Cosmology Second
Argentinian-Brazilian Meeting, 2014 G. S. Vila, F. L. Vieyro and J. Fabris,
eds. ISBN 978-987-24948-2-7 pp. 64-74 (2015) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we analyze the dynamics of collisionless self-gravitating
systems described by the f(R)-gravity and Boltzmann equation in the weak field
approximation, focusing on the Jeans instability for theses systems. The field
equations in this approximation were obtained within the Palatini formalism.
Through the ... | [
{
"created": "Sat, 22 Nov 2014 08:03:56 GMT",
"version": "v1"
}
] | 2016-02-15 | [
[
"André",
"Raíla",
""
],
[
"Kremer",
"Gilberto M.",
""
]
] | In this work we analyze the dynamics of collisionless self-gravitating systems described by the f(R)-gravity and Boltzmann equation in the weak field approximation, focusing on the Jeans instability for theses systems. The field equations in this approximation were obtained within the Palatini formalism. Through the so... |
1208.5655 | A. Tawfik | A. Tawfik (Egyptian Ctr. Theor. Phys., Cairo & Freie U., Berlin), H.
Magdy (Egyptian Ctr. Theor. Phys., Cairo), A. Farag Ali (Benha U.) | Effects of quantum gravity on the inflationary parameters and
thermodynamics of the early universe | 15 graghes, 7 figures with 17 eps graphs | Gen.Rel.Grav. 45 (2013) 1227-1246 | 10.1007/s10714-013-1522-0 | ECTP-2012-02 | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The effects of generalized uncertainty principle (GUP) on the inflationary
dynamics and the thermodynamics of the early universe are studied. Using the
GUP approach, the tensorial and scalar density fluctuations in the inflation
era are evaluated and compared with the standard case. We find a good agreement
with the ... | [
{
"created": "Tue, 28 Aug 2012 13:27:21 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Mar 2013 12:35:56 GMT",
"version": "v2"
}
] | 2013-05-16 | [
[
"Tawfik",
"A.",
"",
"Egyptian Ctr. Theor. Phys., Cairo & Freie U., Berlin"
],
[
"Magdy",
"H.",
"",
"Egyptian Ctr. Theor. Phys., Cairo"
],
[
"Ali",
"A. Farag",
"",
"Benha U."
]
] | The effects of generalized uncertainty principle (GUP) on the inflationary dynamics and the thermodynamics of the early universe are studied. Using the GUP approach, the tensorial and scalar density fluctuations in the inflation era are evaluated and compared with the standard case. We find a good agreement with the Wi... |
1908.11438 | Hristu Culetu | Hristu Culetu | Accelerating imperfect fluid | 9 pages, no figures, small corrections; Phys. Lett. A384, issue 12
(2020) 126348 | null | 10.1016/j.physleta.2020.126348 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An inhomogeneous fluid in accelerated motion is investigated. When the
velocity field $v(x)$ is not constant, the geometry viewed by a static observer
is curved, as if the observer were immersed in a gravitational field. A
velocity-dependent semiclassical gravitational potential is introduced, which
obeys an Yukawa-t... | [
{
"created": "Sat, 17 Aug 2019 23:16:51 GMT",
"version": "v1"
},
{
"created": "Sun, 8 Sep 2019 19:10:06 GMT",
"version": "v2"
},
{
"created": "Fri, 22 Nov 2019 12:39:07 GMT",
"version": "v3"
},
{
"created": "Tue, 21 Jan 2020 12:24:31 GMT",
"version": "v4"
},
{
"cr... | 2020-03-11 | [
[
"Culetu",
"Hristu",
""
]
] | An inhomogeneous fluid in accelerated motion is investigated. When the velocity field $v(x)$ is not constant, the geometry viewed by a static observer is curved, as if the observer were immersed in a gravitational field. A velocity-dependent semiclassical gravitational potential is introduced, which obeys an Yukawa-typ... |
gr-qc/0601130 | Jiri Podolsky | J. Podolsky, J. B. Griffiths | Accelerating Kerr-Newman black holes in (anti-)de Sitter space-time | 5 pages. To appear in Phys. Rev. D | Phys.Rev. D73 (2006) 044018 | 10.1103/PhysRevD.73.044018 | null | gr-qc | null | A class of exact solutions of the Einstein-Maxwell equations is presented
which describes an accelerating and rotating charged black hole in an
asymptotically de Sitter or anti-de Sitter universe. The metric is presented in
a new and convenient form in which the meaning of the parameters is clearly
identified, and fr... | [
{
"created": "Mon, 30 Jan 2006 10:22:06 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Podolsky",
"J.",
""
],
[
"Griffiths",
"J. B.",
""
]
] | A class of exact solutions of the Einstein-Maxwell equations is presented which describes an accelerating and rotating charged black hole in an asymptotically de Sitter or anti-de Sitter universe. The metric is presented in a new and convenient form in which the meaning of the parameters is clearly identified, and from... |
gr-qc/0402081 | Barrabes | Claude Barrab\`es, Valeri P. Frolov and Emmanuel Lesigne | Geometric Inequalities and Trapped Surfaces in Higher Dimensional
Spacetimes | 9 pages | Phys.Rev. D69 (2004) 101501 | 10.1103/PhysRevD.69.101501 | null | gr-qc | null | Geometric inequalities of classical differential geometry are used to extend
to higher dimensional spacetimes the Penrose-Gibbons isoperimetric inequalities
and the hoop conjecture of general reltivity.
| [
{
"created": "Wed, 18 Feb 2004 14:40:49 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Mar 2004 14:03:35 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Barrabès",
"Claude",
""
],
[
"Frolov",
"Valeri P.",
""
],
[
"Lesigne",
"Emmanuel",
""
]
] | Geometric inequalities of classical differential geometry are used to extend to higher dimensional spacetimes the Penrose-Gibbons isoperimetric inequalities and the hoop conjecture of general reltivity. |
gr-qc/0510082 | Pedro Lauridsen Ribeiro | Pedro Lauridsen Ribeiro | Conserved gravitational charges, locality and the holographic Weyl
anomaly - a fresh viewpoint | revtex4 format, 3 pages, no figures. Modified version of a poster
presentation made at the International Conference ''100 Years of
Relativity'', held at the MASP, Sao Paulo, Brazil, in August 22nd-24th, 2005.
Submitted to refereeing for publication in Conference's Proceedings volume by
Braz.J.Phys | Braz.J.Phys. 35 (2005) 1133-1135 | null | null | gr-qc | null | Since the proposal of the AdS/CFT correspondence, made by Maldacena and
Witten, there has been some controversy about the definition of conserved
Noether charges associated to asymptotic isometries in asymptotically AdS
spacetimes, namely, whether they form an anomalous (i.e., a nontrivial central
extension) represen... | [
{
"created": "Mon, 17 Oct 2005 17:55:47 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ribeiro",
"Pedro Lauridsen",
""
]
] | Since the proposal of the AdS/CFT correspondence, made by Maldacena and Witten, there has been some controversy about the definition of conserved Noether charges associated to asymptotic isometries in asymptotically AdS spacetimes, namely, whether they form an anomalous (i.e., a nontrivial central extension) representa... |
gr-qc/0101127 | Javier Chavarriga | Javier Chavarriga, I. A. Garc\'ia | Integrability and explicit solutions in some Bianchi cosmological
dynamical systems | null | J. Nonlinear Math. Phys. 8 (2001), no. 1, 96-105 | 10.2991/jnmp.2001.8.1.9 | JNMP 4/2002 (Article) | gr-qc | null | The Einstein field equations for several cosmological models reduce to
polynomial systems of ordinary differential equations. In this paper we shall
concentrate our attention to the spatially homogeneous diagonal G_2
cosmologies. By using Darboux's theory in order to study ordinary differential
equations in the compl... | [
{
"created": "Mon, 1 Jan 2001 00:00:00 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Chavarriga",
"Javier",
""
],
[
"García",
"I. A.",
""
]
] | The Einstein field equations for several cosmological models reduce to polynomial systems of ordinary differential equations. In this paper we shall concentrate our attention to the spatially homogeneous diagonal G_2 cosmologies. By using Darboux's theory in order to study ordinary differential equations in the complex... |
1411.7254 | Jean-Marie Vigoureux | Michel Langlois, M. Meyer and Jean-Marie Vigoureux | Introduction of the Lie group of Lorentz matrices in Special Relativity.
Tangent boost along a worldline and its associated matrix in the Lie algebra.
Applications | 30 pages, in English, 3 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to generalize the relativistic notion of boost to the case of non
inertial particles and to general relativity, we come back to the definition of
Lie group of Lorentz matrices and its Lie algebra and we study how this group
acts on the Minskowski space. We thus define the notion of tangent boost along
a worl... | [
{
"created": "Tue, 25 Nov 2014 11:17:04 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Jun 2016 09:08:13 GMT",
"version": "v2"
},
{
"created": "Thu, 8 Sep 2016 08:11:04 GMT",
"version": "v3"
}
] | 2016-09-09 | [
[
"Langlois",
"Michel",
""
],
[
"Meyer",
"M.",
""
],
[
"Vigoureux",
"Jean-Marie",
""
]
] | In order to generalize the relativistic notion of boost to the case of non inertial particles and to general relativity, we come back to the definition of Lie group of Lorentz matrices and its Lie algebra and we study how this group acts on the Minskowski space. We thus define the notion of tangent boost along a worldl... |
1607.03779 | Sascha Trippe | Dong-Hoon Kim (Ewha U, Seoul), Sascha Trippe (SNU Seoul) | Primordial Gravitational Waves and Rescattered Electromagnetic Radiation
in the Cosmic Microwave Background | 25 pages, 7 figures; to appear in ApJ (received: 2016 April 25;
accepted: 2016 July 2) | null | 10.3847/0004-637X/830/2/161 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Understanding the interaction of primordial gravitational waves (GWs) with
the Cosmic Microwave Background (CMB) plasma is important for observational
cosmology. In this article, we provide an analysis of an effect apparently
overlooked as yet. We consider a single free electric charge and suppose that
it can be agit... | [
{
"created": "Tue, 5 Jul 2016 07:19:26 GMT",
"version": "v1"
}
] | 2016-10-26 | [
[
"Kim",
"Dong-Hoon",
"",
"Ewha U, Seoul"
],
[
"Trippe",
"Sascha",
"",
"SNU Seoul"
]
] | Understanding the interaction of primordial gravitational waves (GWs) with the Cosmic Microwave Background (CMB) plasma is important for observational cosmology. In this article, we provide an analysis of an effect apparently overlooked as yet. We consider a single free electric charge and suppose that it can be agitat... |
1711.07069 | Maria Skugoreva | Maria A. Skugoreva, Alexey V. Toporensky | On Kasner solution in Bianchi I $f(T)$ cosmology | 11 pages, 7 figures, v3: some new results added, v4: some
clarifications added | Eur. Phys. J. C 78 (2018) no. 5, 377 | 10.1140/epjc/s10052-018-5857-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently cosmological dynamics of anisotropic Universe in $f(T)$ gravity
became an area of intense investigations. Some earlier papers devoted to this
issue contain contradictory claims about the nature and propertied of vacuum
solutions in this theory. The goal of the present paper is to clarify this
situation. We c... | [
{
"created": "Sun, 19 Nov 2017 20:13:45 GMT",
"version": "v1"
},
{
"created": "Sat, 25 Nov 2017 18:30:49 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Jan 2018 17:25:23 GMT",
"version": "v3"
},
{
"created": "Tue, 1 May 2018 19:35:45 GMT",
"version": "v4"
}
] | 2018-08-22 | [
[
"Skugoreva",
"Maria A.",
""
],
[
"Toporensky",
"Alexey V.",
""
]
] | Recently cosmological dynamics of anisotropic Universe in $f(T)$ gravity became an area of intense investigations. Some earlier papers devoted to this issue contain contradictory claims about the nature and propertied of vacuum solutions in this theory. The goal of the present paper is to clarify this situation. We com... |
2301.08467 | Yehui Hou | Yehui Hou, Zhenyu Zhang, Minyong Guo, Bin Chen | Electromagnetic effects on charged particles in NHEK | 26 pages, 4 figures | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | We investigate the motions of charged particles in the near horizon region of
an extreme Kerr black hole with weak electromagnetic fields. There is an
enhanced symmetry in the NHEK geometry. We find that when the electromagnetic
field respects this enhanced symmetry, which we refer to as the maximally
symmetric elect... | [
{
"created": "Fri, 20 Jan 2023 08:33:59 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Jun 2023 11:04:13 GMT",
"version": "v2"
}
] | 2023-06-13 | [
[
"Hou",
"Yehui",
""
],
[
"Zhang",
"Zhenyu",
""
],
[
"Guo",
"Minyong",
""
],
[
"Chen",
"Bin",
""
]
] | We investigate the motions of charged particles in the near horizon region of an extreme Kerr black hole with weak electromagnetic fields. There is an enhanced symmetry in the NHEK geometry. We find that when the electromagnetic field respects this enhanced symmetry, which we refer to as the maximally symmetric electro... |
1501.00886 | Vladimir Dzhunushaliev | Vladimir Dzhunushaliev, Vladimir Folomeev, Burkhard Kleihaus, Jutta
Kunz | Modified gravity from the nonperturbative quantization of a metric | Appendix B is added | null | 10.1140/epjc/s10052-015-3398-5 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on certain assumptions for the expectation value of a product of the
quantum fluctuating metric at two points, the gravitational and scalar field
Lagrangians are evaluated. Assuming a vanishing expectation value of the first
order terms of the metric, the calculations are performed with an accuracy of
second or... | [
{
"created": "Mon, 5 Jan 2015 15:13:17 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Apr 2015 02:58:33 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Folomeev",
"Vladimir",
""
],
[
"Kleihaus",
"Burkhard",
""
],
[
"Kunz",
"Jutta",
""
]
] | Based on certain assumptions for the expectation value of a product of the quantum fluctuating metric at two points, the gravitational and scalar field Lagrangians are evaluated. Assuming a vanishing expectation value of the first order terms of the metric, the calculations are performed with an accuracy of second orde... |
1607.01018 | Anne Franzen | Jo\~ao L. Costa and Anne T. Franzen | Bounded energy waves on the black hole interior of
Reissner-Nordstr\"om-de Sitter | 21 pages, 5 figures | Annales Henri Poincar\'e. 18 (10), (2017), 3371-3398 | 10.1007/s00023-017-0592-z | null | gr-qc math-ph math.AP math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by the Strong Cosmic Censorship Conjecture, in the presence of a
cosmological constant, we consider solutions of the scalar wave equation
$\Box_g\phi=0$ on fixed subextremal Reissner--Nordstr\"om--de Sitter
backgrounds $({\mathcal M}, g)$, without imposing symmetry assumptions on
$\phi$. We provide a suffic... | [
{
"created": "Mon, 4 Jul 2016 20:00:03 GMT",
"version": "v1"
},
{
"created": "Mon, 23 Oct 2017 15:08:27 GMT",
"version": "v2"
}
] | 2018-03-28 | [
[
"Costa",
"João L.",
""
],
[
"Franzen",
"Anne T.",
""
]
] | Motivated by the Strong Cosmic Censorship Conjecture, in the presence of a cosmological constant, we consider solutions of the scalar wave equation $\Box_g\phi=0$ on fixed subextremal Reissner--Nordstr\"om--de Sitter backgrounds $({\mathcal M}, g)$, without imposing symmetry assumptions on $\phi$. We provide a sufficie... |
2208.01621 | Jian-Hua He | Jian-hua He, Zhenyu Wu | Simulating gravitational waves passing through the spacetime of a black
hole | 26 pages, 11 figures, revised version, new discussions on realistic
input waveforms are added, accepted for publication in PRD | Phys. Rev. D 106, 124037 (2022) | 10.1103/PhysRevD.106.124037 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate how GWs pass through the spacetime of a Schwarzschild black
hole using time-domain numerical simulations. Our work is based on the
perturbed 3+1 Einstein's equations up to the linear order. We show explicitly
that our perturbation equations are covariant under infinitesimal coordinate
transformations. ... | [
{
"created": "Mon, 1 Aug 2022 08:11:39 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Dec 2022 05:52:36 GMT",
"version": "v2"
}
] | 2022-12-29 | [
[
"He",
"Jian-hua",
""
],
[
"Wu",
"Zhenyu",
""
]
] | We investigate how GWs pass through the spacetime of a Schwarzschild black hole using time-domain numerical simulations. Our work is based on the perturbed 3+1 Einstein's equations up to the linear order. We show explicitly that our perturbation equations are covariant under infinitesimal coordinate transformations. Th... |
1001.4469 | Timothy Clifton | Timothy Clifton and John D. Barrow | Observational Constraints on the Completeness of Space near
Astrophysical Objects | 6 pages | Phys.Rev.D81:063006,2010 | 10.1103/PhysRevD.81.063006 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the observational effects of a deficit angle, w, in the topology
of the solar system and in the 'double pulsar' system PSR J0737-3039A/B. Using
observations of the perihelion precession of Mercury, and the gravitational
deflection of light due to the Sun, we constrain the magnitude of such a
deficit angle... | [
{
"created": "Mon, 25 Jan 2010 16:00:22 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Mar 2010 14:03:17 GMT",
"version": "v2"
}
] | 2010-04-29 | [
[
"Clifton",
"Timothy",
""
],
[
"Barrow",
"John D.",
""
]
] | We consider the observational effects of a deficit angle, w, in the topology of the solar system and in the 'double pulsar' system PSR J0737-3039A/B. Using observations of the perihelion precession of Mercury, and the gravitational deflection of light due to the Sun, we constrain the magnitude of such a deficit angle i... |
2206.04464 | Aneta Wojnar | D\'ebora Aguiar Gomes, Aneta Wojnar | Early evolution of fully convective stars in scalar-tensor gravity | 11 pages, 1 figure, to appear in EPJC | Eur. Phys. J. C (2023) 83:492 | 10.1140/epjc/s10052-023-11659-9 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work, the early evolution of low-mass fully convective stars is
studied in the context of DHOST (degenerate higher order scalar-tensor)
theories of gravity. Although it is known that the hydrostatic equilibrium
equation is modified for scalar-tensor gravity, the consequent modifications to
the early evolution... | [
{
"created": "Thu, 9 Jun 2022 12:44:16 GMT",
"version": "v1"
},
{
"created": "Fri, 26 May 2023 09:27:25 GMT",
"version": "v2"
}
] | 2023-06-13 | [
[
"Gomes",
"Débora Aguiar",
""
],
[
"Wojnar",
"Aneta",
""
]
] | In this work, the early evolution of low-mass fully convective stars is studied in the context of DHOST (degenerate higher order scalar-tensor) theories of gravity. Although it is known that the hydrostatic equilibrium equation is modified for scalar-tensor gravity, the consequent modifications to the early evolution p... |
1712.10315 | Markus P\"ossel | Markus P\"ossel | The expanding universe: an introduction | 107 pages, 33 figures. Extended notes for a lecture held as part of
the WE Heraeus Summer School "Astronomy from Four Perspectives: The Dark
Universe" at Haus der Astronomie, Heidelberg, on 28 August 2017 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An introduction to the physics and mathematics of the expanding universe,
using no more than high-school level / undergraduate mathematics. Covered are
the basics of scale factor expansion, the dynamics of the expanding universe,
various distance concepts and the generalized redshift-luminosity relation,
among other ... | [
{
"created": "Fri, 29 Dec 2017 18:59:33 GMT",
"version": "v1"
}
] | 2018-01-01 | [
[
"Pössel",
"Markus",
""
]
] | An introduction to the physics and mathematics of the expanding universe, using no more than high-school level / undergraduate mathematics. Covered are the basics of scale factor expansion, the dynamics of the expanding universe, various distance concepts and the generalized redshift-luminosity relation, among other to... |
2102.12329 | Philip Tee | Philip Tee and C. A. Trugenberger | Enhanced Forman curvature and its relation to Ollivier curvature | null | null | 10.1209/0295-5075/133/60006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent advances in emergent geometry and discretized approaches to quantum
gravity have relied upon the notion of a discrete measure of graph curvature.
We focus on the two main measures that have been studied, the so-called
Ollivier-Ricci and Forman-Ricci curvatures. These two approaches have a very
different origin... | [
{
"created": "Wed, 24 Feb 2021 15:05:38 GMT",
"version": "v1"
},
{
"created": "Sun, 25 Apr 2021 22:56:36 GMT",
"version": "v2"
}
] | 2021-06-08 | [
[
"Tee",
"Philip",
""
],
[
"Trugenberger",
"C. A.",
""
]
] | Recent advances in emergent geometry and discretized approaches to quantum gravity have relied upon the notion of a discrete measure of graph curvature. We focus on the two main measures that have been studied, the so-called Ollivier-Ricci and Forman-Ricci curvatures. These two approaches have a very different origin, ... |
2312.16901 | Ratchaphat Nakarachinda | Ratchaphat Nakarachinda, Chakrit Pongkitivanichkul, Daris Samart,
Lunchakorn Tannukij and Pitayuth Wongjun | R\'enyi Holographic Dark Energy | 36 pages, 9 figures, 2 tables | Fortschr. Phys. 2024, 2400073 | 10.1002/prop.202400073 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In this work, the holographic dark energy model is constructed by using the
non-extensive nature of the Schwarzschild black hole via the R\'enyi entropy.
Due to the non-extensivity, the black hole can be stable under the process of
fixing the non-extensive parameter. A change undergoing such a process would
then moti... | [
{
"created": "Thu, 28 Dec 2023 08:45:23 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Jul 2024 03:51:36 GMT",
"version": "v2"
}
] | 2024-07-30 | [
[
"Nakarachinda",
"Ratchaphat",
""
],
[
"Pongkitivanichkul",
"Chakrit",
""
],
[
"Samart",
"Daris",
""
],
[
"Tannukij",
"Lunchakorn",
""
],
[
"Wongjun",
"Pitayuth",
""
]
] | In this work, the holographic dark energy model is constructed by using the non-extensive nature of the Schwarzschild black hole via the R\'enyi entropy. Due to the non-extensivity, the black hole can be stable under the process of fixing the non-extensive parameter. A change undergoing such a process would then motiva... |
1503.02634 | Florent Michel | Yves Aur\'egan, Pierre Fromholz, Florent Michel, Vincent Pagneux,
Renaud Parentani | Slow Sound in a duct, effective transonic flows and analogue black holes | 5 pages + 2 pages of supplementary material, 4 figures in total,
final version published in PRD | Phys. Rev. D 92, 081503 (2015) | 10.1103/PhysRevD.92.081503 | LPT-Orsay-15-21 | gr-qc physics.flu-dyn | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new system suitable for studying analogue gravity effects,
consisting of a gas flowing in a duct with a compliant wall. Effective
transonic flows are obtained from uniform, low Mach number flows through the
reduction of the one-dimensional speed of sound induced by the wall compliance.
We show that the m... | [
{
"created": "Mon, 9 Mar 2015 19:32:46 GMT",
"version": "v1"
},
{
"created": "Sat, 19 Dec 2015 17:01:17 GMT",
"version": "v2"
}
] | 2015-12-22 | [
[
"Aurégan",
"Yves",
""
],
[
"Fromholz",
"Pierre",
""
],
[
"Michel",
"Florent",
""
],
[
"Pagneux",
"Vincent",
""
],
[
"Parentani",
"Renaud",
""
]
] | We propose a new system suitable for studying analogue gravity effects, consisting of a gas flowing in a duct with a compliant wall. Effective transonic flows are obtained from uniform, low Mach number flows through the reduction of the one-dimensional speed of sound induced by the wall compliance. We show that the mod... |
2309.15464 | Marc Mars | Piotr T. Chru\'sciel, Marc Mars | On staticity of bifurcate Killing horizons | 20 pages, no figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We show that bifurcate Killing horizons with closed torsion form, in
spacetimes of arbitrary dimension satisfying a Ricci-structure condition, arise
from static Killing vectors. The result applies in particular to
$\Lambda$-vacuum spacetimes.
| [
{
"created": "Wed, 27 Sep 2023 07:59:24 GMT",
"version": "v1"
}
] | 2023-09-28 | [
[
"Chruściel",
"Piotr T.",
""
],
[
"Mars",
"Marc",
""
]
] | We show that bifurcate Killing horizons with closed torsion form, in spacetimes of arbitrary dimension satisfying a Ricci-structure condition, arise from static Killing vectors. The result applies in particular to $\Lambda$-vacuum spacetimes. |
2103.00312 | Peter K.F. Kuhfittig | Peter K.F. Kuhfittig | On the nature of exotic matter in Morris-Thorne wormholes | 6 pages, no figures | New Horizons in Mathematical Physics, Vol. 4, No. 3 (2020) pp.
29-32 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that phantom energy, which is characterized by the equation
of state $p=\omega\rho$, $\omega <-1$, can support Morris-Thorne wormholes
since it leads to a violation of the null energy condition. The purpose of this
note is to show that the converse is also true in the following sense: for a
typical s... | [
{
"created": "Sat, 27 Feb 2021 20:14:04 GMT",
"version": "v1"
}
] | 2021-03-02 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | It is well known that phantom energy, which is characterized by the equation of state $p=\omega\rho$, $\omega <-1$, can support Morris-Thorne wormholes since it leads to a violation of the null energy condition. The purpose of this note is to show that the converse is also true in the following sense: for a typical sha... |
1707.01471 | Yu-Hsiang Lin | Pisin Chen, Yu-Hsiang Lin, Dong-han Yeom | Suppression of long-wavelength CMB spectrum from the no-boundary initial
condition | 9 pages, 7 figures; journal version | Eur. Phys. J. C 78, 930 (2018) | 10.1140/epjc/s10052-018-6426-4 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The lack of correlations at the long-wavelength scales of the cosmic
microwave background spectrum is a long-standing puzzle and it persists in the
latest Planck data. By considering the Hartle-Hawking no-boundary wave function
as the initial condition of the inflationary universe, we propose that the
power suppressi... | [
{
"created": "Wed, 5 Jul 2017 17:09:09 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Nov 2018 02:57:37 GMT",
"version": "v2"
}
] | 2018-11-22 | [
[
"Chen",
"Pisin",
""
],
[
"Lin",
"Yu-Hsiang",
""
],
[
"Yeom",
"Dong-han",
""
]
] | The lack of correlations at the long-wavelength scales of the cosmic microwave background spectrum is a long-standing puzzle and it persists in the latest Planck data. By considering the Hartle-Hawking no-boundary wave function as the initial condition of the inflationary universe, we propose that the power suppression... |
2110.01478 | Bella Finkel | Bella Finkel, Haakon Andresen and Vuk Mandic | Stochastic Gravitational-Wave Background from Stellar Core-Collapse
Events | 10 pages, 3 figures | Phys. Rev. D 105, 063022 (2022) | 10.1103/PhysRevD.105.063022 | null | gr-qc astro-ph.CO astro-ph.HE astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We estimate the stochastic gravitational-wave background arising from all
stellar core-collapse events in the universe based on the gravitational-wave
signal predictions of recent numerical simulations. We focus on waveforms from
slowly or non-rotating stars and include rapidly rotating, highly massive
progenitors as... | [
{
"created": "Mon, 4 Oct 2021 14:31:15 GMT",
"version": "v1"
},
{
"created": "Mon, 28 Mar 2022 19:45:22 GMT",
"version": "v2"
}
] | 2022-03-30 | [
[
"Finkel",
"Bella",
""
],
[
"Andresen",
"Haakon",
""
],
[
"Mandic",
"Vuk",
""
]
] | We estimate the stochastic gravitational-wave background arising from all stellar core-collapse events in the universe based on the gravitational-wave signal predictions of recent numerical simulations. We focus on waveforms from slowly or non-rotating stars and include rapidly rotating, highly massive progenitors as e... |
0711.2667 | Michele Vallisneri | Stanislav Babak, John G. Baker, Matthew J. Benacquista, Neil J.
Cornish, Jeff Crowder, Curt Cutler, Shane L. Larson, Tyson B. Littenberg,
Edward K. Porter, Michele Vallisneri, Alberto Vecchio (the Mock LISA Data
Challenge task force) and Gerard Auger, Leor Barack, Arkadiusz Blaut, Ed
Bloomer, Duncan A. Brown, N... | Report on the second Mock LISA Data Challenge | 8 pages, 2 EPS figures, proceedings of the 7th Amaldi Conference on
Gravitational Waves, 8-14 July 2007, Sydney, Australia | Class.Quant.Grav.25:114037,2008 | 10.1088/0264-9381/25/11/114037 | null | gr-qc | null | The Mock LISA Data Challenges are a program to demonstrate LISA data-analysis
capabilities and to encourage their development. Each round of challenges
consists of several data sets containing simulated instrument noise and
gravitational-wave sources of undisclosed parameters. Participants are asked to
analyze the da... | [
{
"created": "Fri, 16 Nov 2007 19:05:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Babak",
"Stanislav",
"",
"the Mock LISA Data\n Challenge task force"
],
[
"Baker",
"John G.",
"",
"the Mock LISA Data\n Challenge task force"
],
[
"Benacquista",
"Matthew J.",
"",
"the Mock LISA Data\n Challenge task force"
],
[
"Cornish",
"N... | The Mock LISA Data Challenges are a program to demonstrate LISA data-analysis capabilities and to encourage their development. Each round of challenges consists of several data sets containing simulated instrument noise and gravitational-wave sources of undisclosed parameters. Participants are asked to analyze the data... |
gr-qc/9303018 | Miguel Navarro | J. Navarro-Salas, M. Navarro and V. Aldaya | Wave Functions of the Induced 2D-Gravity | 9 pages; FTUV/93-3&IFIC/93-3 | Phys.Lett.B318:293-297,1993 | 10.1016/0370-2693(93)90131-Z | null | gr-qc | null | We consider the induced $2$d-gravity in the minisuperspace approach. The
general solution to the Wheeler-DeWitt equation is given in terms of different
kind of Bessel functions of purely real or imaginary orders. We study the
properties of the corresponding probability distribution finding a kind of
phase transition ... | [
{
"created": "Fri, 12 Mar 1993 08:36:56 GMT",
"version": "v1"
}
] | 2011-04-20 | [
[
"Navarro-Salas",
"J.",
""
],
[
"Navarro",
"M.",
""
],
[
"Aldaya",
"V.",
""
]
] | We consider the induced $2$d-gravity in the minisuperspace approach. The general solution to the Wheeler-DeWitt equation is given in terms of different kind of Bessel functions of purely real or imaginary orders. We study the properties of the corresponding probability distribution finding a kind of phase transition at... |
1512.09216 | Spiros Cotsakis | Ignatios Antoniadis, Spiros Cotsakis | The large-scale structure of the ambient boundary | v2: 5 pages, downsized version to appear in the MG14 Proceedings | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This article gives a review of a recent construction, the ambient
cosmological metric, and its implications for the global geometry of the
universe. According to this proposal, the universe is a bounding hypersurface
carrying a conformal structure and lying at the (conformal) infinity of a new,
5-geometry which satis... | [
{
"created": "Thu, 31 Dec 2015 05:23:34 GMT",
"version": "v1"
},
{
"created": "Sat, 24 Sep 2016 09:58:16 GMT",
"version": "v2"
}
] | 2016-09-27 | [
[
"Antoniadis",
"Ignatios",
""
],
[
"Cotsakis",
"Spiros",
""
]
] | This article gives a review of a recent construction, the ambient cosmological metric, and its implications for the global geometry of the universe. According to this proposal, the universe is a bounding hypersurface carrying a conformal structure and lying at the (conformal) infinity of a new, 5-geometry which satisfi... |
gr-qc/0311081 | Pierre Noundjeu | P. Noundjeu, N. Noutchegueme | Local Existence and Continuation Criterion for Solutions of the
Spherically Symmetric Einstein-Vlasov-Maxwell System | 25 pages | Gen.Rel.Grav. 36 (2004) 1373-1398 | 10.1023/B:GERG.0000022393.59558.fd | null | gr-qc | null | Using the iterative Scheme we prove the local existence and uniqueness of
solutions of the spherically symmetric Einstein-Vlasov-Maxwell system with
small initial data. We prove a continuation criterion to global in-time
solutions.
| [
{
"created": "Mon, 24 Nov 2003 14:53:51 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Noundjeu",
"P.",
""
],
[
"Noutchegueme",
"N.",
""
]
] | Using the iterative Scheme we prove the local existence and uniqueness of solutions of the spherically symmetric Einstein-Vlasov-Maxwell system with small initial data. We prove a continuation criterion to global in-time solutions. |
0910.2758 | Angelo Tartaglia | A. Tartaglia | Emission coordinates for the navigation in space | 13 pages, 1 figure, appearing on the Proceedings of the 60th
International Astronautical Conference IAC 2009, October 12-16, Daejeong,
Korea | null | 10.1016/j.actaastro.2010.04.007 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A general approach to the problem of positioning by means of pulsars or other
pulsating sources located at infinity is described. The counting of the pulses
for a set of different sources whose positions in the sky and periods are
assumed to be known, is used to provide null emission, or light, coordinates
for the re... | [
{
"created": "Thu, 15 Oct 2009 01:49:26 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Tartaglia",
"A.",
""
]
] | A general approach to the problem of positioning by means of pulsars or other pulsating sources located at infinity is described. The counting of the pulses for a set of different sources whose positions in the sky and periods are assumed to be known, is used to provide null emission, or light, coordinates for the rece... |
2001.03116 | Banafsheh Beheshtipour | Banafsheh Beheshtipour, Maria Alessandra Papa | Deep learning for clustering of continuous gravitational wave candidates | null | Phys. Rev. D 101, 064009 (2020) | 10.1103/PhysRevD.101.064009 | null | gr-qc astro-ph.IM physics.data-an | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In searching for continuous gravitational waves over very many ($\approx
10^{17}$) templates , clustering is a powerful tool which increases the search
sensitivity by identifying and bundling together candidates that are due to the
same root cause. We implement a deep learning network that identifies clusters
of sign... | [
{
"created": "Thu, 9 Jan 2020 17:25:44 GMT",
"version": "v1"
},
{
"created": "Tue, 14 Jan 2020 09:20:12 GMT",
"version": "v2"
}
] | 2020-03-11 | [
[
"Beheshtipour",
"Banafsheh",
""
],
[
"Papa",
"Maria Alessandra",
""
]
] | In searching for continuous gravitational waves over very many ($\approx 10^{17}$) templates , clustering is a powerful tool which increases the search sensitivity by identifying and bundling together candidates that are due to the same root cause. We implement a deep learning network that identifies clusters of signal... |
gr-qc/9512033 | null | Giampiero Esposito, Gennaro Miele, and Pietro Santorelli | Coleman-Weinberg SO(10) GUT Theories as Inflationary Models | 20 pages, ReVTeX, 4 figures uuencoded tarred and compressed | Phys.Rev.D54:1359-1368,1996 | 10.1103/PhysRevD.54.1359 | DSF Preprint 95/50 | gr-qc | null | The flat-space limit of the one-loop effective potential for SO(10) GUT
theories in spatially flat Friedmann-Robertson-Walker cosmologies is applied to
study the dynamics of the early universe. The numerical integration of the
corresponding field equations shows that, for such grand unified theories, a
sufficiently l... | [
{
"created": "Mon, 18 Dec 1995 15:53:48 GMT",
"version": "v1"
}
] | 2011-08-11 | [
[
"Esposito",
"Giampiero",
""
],
[
"Miele",
"Gennaro",
""
],
[
"Santorelli",
"Pietro",
""
]
] | The flat-space limit of the one-loop effective potential for SO(10) GUT theories in spatially flat Friedmann-Robertson-Walker cosmologies is applied to study the dynamics of the early universe. The numerical integration of the corresponding field equations shows that, for such grand unified theories, a sufficiently lon... |
gr-qc/0402014 | Dong-Hoon Kim | Dong-Hoon Kim | Regularization parameters for the self-force of a scalar particle in a
general orbit about a Schwarzschild black hole | 27 pages, no figure | null | null | null | gr-qc | null | The interaction of a charged particle with its own field results in the
"self-force" on the particle, which includes but is more general than the
radiation reaction force. In the vicinity of the particle in curved spacetime,
one may follow Dirac and split the retarded field of the particle into two
parts, (1) the sin... | [
{
"created": "Tue, 3 Feb 2004 11:47:12 GMT",
"version": "v1"
},
{
"created": "Fri, 17 Dec 2004 18:38:03 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Kim",
"Dong-Hoon",
""
]
] | The interaction of a charged particle with its own field results in the "self-force" on the particle, which includes but is more general than the radiation reaction force. In the vicinity of the particle in curved spacetime, one may follow Dirac and split the retarded field of the particle into two parts, (1) the singu... |
gr-qc/0208069 | Khusnutdinov | S.V. Sushkov, S.-W. Kim | Wormholes supported by the kink-like configuration of a scalar field | 11 pages, 11 eps figures, revtex4, accepted in Class.Quantum Grav | Class.Quant.Grav. 19 (2002) 4909-4922 | 10.1088/0264-9381/19/19/309 | null | gr-qc | null | We study the problem of existence of static spherically symmetric wormholes
supported by the kink-like configuration of a scalar field. With this aim we
consider a self-consistent, real, nonlinear, nonminimally coupled scalar field
$\phi$ in general relativity with the symmetry-breaking potential $V(\phi)$
possessing... | [
{
"created": "Fri, 23 Aug 2002 12:01:27 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Sushkov",
"S. V.",
""
],
[
"Kim",
"S. -W.",
""
]
] | We study the problem of existence of static spherically symmetric wormholes supported by the kink-like configuration of a scalar field. With this aim we consider a self-consistent, real, nonlinear, nonminimally coupled scalar field $\phi$ in general relativity with the symmetry-breaking potential $V(\phi)$ possessing t... |
gr-qc/9410043 | null | L.H. Ford and Thomas A. Roman | Averaged Energy Conditions and Quantum Inequalities | 20pp, plain LATEX, TUTP-94-16 | Phys.Rev.D51:4277-4286,1995 | 10.1103/PhysRevD.51.4277 | null | gr-qc hep-th | null | Connections are uncovered between the averaged weak (AWEC) and averaged null
(ANEC) energy conditions, and quantum inequality restrictions on negative
energy for free massless scalar fields. In a two-dimensional compactified
Minkowski universe, we derive a covariant quantum inequality-type bound on the
difference of ... | [
{
"created": "Sat, 29 Oct 1994 01:33:00 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Ford",
"L. H.",
""
],
[
"Roman",
"Thomas A.",
""
]
] | Connections are uncovered between the averaged weak (AWEC) and averaged null (ANEC) energy conditions, and quantum inequality restrictions on negative energy for free massless scalar fields. In a two-dimensional compactified Minkowski universe, we derive a covariant quantum inequality-type bound on the difference of th... |
2302.07903 | Leonardo Chataignier | Leonardo Chataignier | Beyond semiclassical time: dynamics in quantum cosmology | Contribution to appear in the proceedings of the conference DICE2022,
September 19-23, 2022 (Castiglioncello, Tuscany), Journ. Phys.: Conf. Series | J. Phys.: Conf. Ser. 2533, 012029 (2023) | 10.1088/1742-6596/2533/1/012029 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We review two approaches to the definition of the Hilbert space and evolution
in mechanical theories with local time-reparametrization invariance, which are
often used as toy models of quantum gravity. The first approach is based on the
definition of invariant relational observables, whereas the second formalism
cons... | [
{
"created": "Wed, 15 Feb 2023 19:00:09 GMT",
"version": "v1"
}
] | 2023-10-20 | [
[
"Chataignier",
"Leonardo",
""
]
] | We review two approaches to the definition of the Hilbert space and evolution in mechanical theories with local time-reparametrization invariance, which are often used as toy models of quantum gravity. The first approach is based on the definition of invariant relational observables, whereas the second formalism consis... |
1111.5695 | Sergey Kozyrev | S. N. Andrianov, R. A.Daishev, S. M. Kozyrev | Klein-Gordon equation for a particle in brane model | 10 pages, 3 figures arXiv admin note: substantial text overlap with
arXiv:0808.3337 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Brane model of universe is considered for free particle. Conservation laws on
the brane are obtained using the symmetry properties of the brane. Equation of
motion is derived for a particle using variation principle from these
conservation laws. This equation includes terms accounting the variation of
brane radius. I... | [
{
"created": "Thu, 24 Nov 2011 08:50:45 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Dec 2011 03:34:14 GMT",
"version": "v2"
},
{
"created": "Fri, 9 Dec 2011 03:41:45 GMT",
"version": "v3"
}
] | 2011-12-12 | [
[
"Andrianov",
"S. N.",
""
],
[
"Daishev",
"R. A.",
""
],
[
"Kozyrev",
"S. M.",
""
]
] | Brane model of universe is considered for free particle. Conservation laws on the brane are obtained using the symmetry properties of the brane. Equation of motion is derived for a particle using variation principle from these conservation laws. This equation includes terms accounting the variation of brane radius. Its... |
0905.0113 | Paul Wesson | Paul S. Wesson | Consequences of Kaluza-Klein Covariance | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The group of coordinate transformations for 5D noncompact Kaluza-Klein theory
is broader than the 4D group for Einstein's general relativity. Therefore, a 4D
quantity can take on different forms depending on the choice for the 5D
coordinates. We illustrate this by deriving the physical consequences for
several forms ... | [
{
"created": "Fri, 1 May 2009 16:28:29 GMT",
"version": "v1"
}
] | 2009-05-04 | [
[
"Wesson",
"Paul S.",
""
]
] | The group of coordinate transformations for 5D noncompact Kaluza-Klein theory is broader than the 4D group for Einstein's general relativity. Therefore, a 4D quantity can take on different forms depending on the choice for the 5D coordinates. We illustrate this by deriving the physical consequences for several forms of... |
1112.5318 | Ingemar Bengtsson | Ingemar Bengtsson | Some examples of trapped surfaces | 21 pages, 8 figures; contribution to "Black Holes: New Horizons",
edited by S. Hayward | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present some simple pen and paper examples of trapped surfaces in order to
help visualising this key concept of the theory of gravitational collapse. We
collect these examples from time-symmetric initial data, 2+1 dimensions,
collapsing null shells, and the Vaidya solution.
| [
{
"created": "Thu, 22 Dec 2011 14:08:34 GMT",
"version": "v1"
}
] | 2011-12-23 | [
[
"Bengtsson",
"Ingemar",
""
]
] | We present some simple pen and paper examples of trapped surfaces in order to help visualising this key concept of the theory of gravitational collapse. We collect these examples from time-symmetric initial data, 2+1 dimensions, collapsing null shells, and the Vaidya solution. |
gr-qc/0605004 | Livia Conti | Michele Bonaldi, Massimo Cerdonio, Livia Conti, Paolo Falferi, Paola
Leaci, Stefano Odorizzi, Giovanni A. Prodi, Mario Saraceni, Enrico Serra,
Jean Pierre Zendri | Principles of wide bandwidth acoustic detectors and the single-mass DUAL
detector | 29 pages, 10 figures | Phys.Rev.D74:022003,2006 | 10.1103/PhysRevD.74.022003 | null | gr-qc | null | We apply the standard theory of the elastic body to obtain a set of equations
describing the behavior of an acoustic Gravitational Wave detector, fully
taking into account the 3-dimensional properties of the mass, the readout and
the signal. We show that the advantages given by a Dual detector made by two
nested osci... | [
{
"created": "Sat, 29 Apr 2006 22:02:55 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Bonaldi",
"Michele",
""
],
[
"Cerdonio",
"Massimo",
""
],
[
"Conti",
"Livia",
""
],
[
"Falferi",
"Paolo",
""
],
[
"Leaci",
"Paola",
""
],
[
"Odorizzi",
"Stefano",
""
],
[
"Prodi",
"Giovanni A.",
""
],
... | We apply the standard theory of the elastic body to obtain a set of equations describing the behavior of an acoustic Gravitational Wave detector, fully taking into account the 3-dimensional properties of the mass, the readout and the signal. We show that the advantages given by a Dual detector made by two nested oscill... |
1509.06846 | Yongwan Gim | Yongwan Gim and Wontae Kim | Hawking, Fiducial, and Free-fall Temperatures of Black Hole on Gravity's
Rainbow | 16 pages, 4 figures, version to appear in EPJC | Eur.Phys.J.C,76 (2016) 166 | 10.1140/epjc/s10052-016-4025-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | On gravity's rainbow, the energy of particles affects the geometry of black
hole in such a way that the Hawking temperature of black hole is appropriately
modified. It means that the fiducial and free-fall temperatures on the
background of black hole should also be modified according to deformation of
the geometry. W... | [
{
"created": "Wed, 23 Sep 2015 05:23:33 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Mar 2016 09:08:56 GMT",
"version": "v2"
}
] | 2016-03-31 | [
[
"Gim",
"Yongwan",
""
],
[
"Kim",
"Wontae",
""
]
] | On gravity's rainbow, the energy of particles affects the geometry of black hole in such a way that the Hawking temperature of black hole is appropriately modified. It means that the fiducial and free-fall temperatures on the background of black hole should also be modified according to deformation of the geometry. We ... |
gr-qc/0012036 | Brandon Carter | Brandon Carter | Essentials of Classical Brane Dynamics | 37 pages, Latex, revised to update references. Based on talk on 5
June, 2000 at Meudon Colloquium ``Motivations for and Implications of Extra
Cosmological Dimensions'' (transparencies visible on line at
http://darc.obspm.fr/col/M00.html) Contribution to proc. Peyresq 5 meeting,
June 2000, ``Quantum spacetime, B... | Int.J.Theor.Phys. 40 (2001) 2099-2130 | null | null | gr-qc | null | This article provides a self contained overview of the geometry and dynamics
of relativistic brane models, of the category that includes point particle,
string, and membrane representations for phenomena that can be considered as
being confined to a worldsheet of the corresponding dimension (respectively
one, two, an... | [
{
"created": "Sun, 10 Dec 2000 10:18:00 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Jan 2001 16:06:24 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Carter",
"Brandon",
""
]
] | This article provides a self contained overview of the geometry and dynamics of relativistic brane models, of the category that includes point particle, string, and membrane representations for phenomena that can be considered as being confined to a worldsheet of the corresponding dimension (respectively one, two, and ... |
0806.3857 | L\'aszl\'o \'A Gergely | L\'aszl\'o \'A. Gergely | Friedmann branes with variable tension | 12 pages, to appear in Phys. Rev. D | Phys.Rev.D78:084006,2008 | 10.1103/PhysRevD.78.084006 | null | gr-qc astro-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We introduce brane-worlds with non-constant tension, strenghtening the
analogy with fluid membranes, which exhibit a temperature-dependence according
to the empirical law established by E\"otv\"os. This new degree of freedom
allows for evolving gravitational and cosmological constants, the latter being
a natural cand... | [
{
"created": "Tue, 24 Jun 2008 12:31:37 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Sep 2008 18:54:49 GMT",
"version": "v2"
},
{
"created": "Mon, 22 Sep 2008 16:00:41 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Gergely",
"László Á.",
""
]
] | We introduce brane-worlds with non-constant tension, strenghtening the analogy with fluid membranes, which exhibit a temperature-dependence according to the empirical law established by E\"otv\"os. This new degree of freedom allows for evolving gravitational and cosmological constants, the latter being a natural candid... |
1801.07643 | Manuel Wittner | Manuel Wittner, Frank K\"onnig, Nima Khosravi, Luca Amendola | Beyond dRGT - a new massive gravity theory? | 6 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is commonly believed that the dRGT theory is the unique way to describe a
massive spin-2 field without ghosts. While dRGT is arguably the most elegant
massive gravity theory, it seems that it may not be the unique ghost-free one
if one relaxes the assumption of locality. In this work, we derive a new
massive gravi... | [
{
"created": "Tue, 23 Jan 2018 16:32:07 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Oct 2018 20:26:04 GMT",
"version": "v2"
}
] | 2018-10-18 | [
[
"Wittner",
"Manuel",
""
],
[
"Könnig",
"Frank",
""
],
[
"Khosravi",
"Nima",
""
],
[
"Amendola",
"Luca",
""
]
] | It is commonly believed that the dRGT theory is the unique way to describe a massive spin-2 field without ghosts. While dRGT is arguably the most elegant massive gravity theory, it seems that it may not be the unique ghost-free one if one relaxes the assumption of locality. In this work, we derive a new massive gravity... |
1712.06980 | Jiri Bicak | D. Lynden-Bell, J. Bi\v{c}\'ak | Komar fluxes of circularly polarized light beams and cylindrical metrics | 1 figure | Phys. Rev. D 96, 104053 (2017) | 10.1103/PhysRevD.96.104053 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass per unit length of a cylindrical system can be found from its
external metric as can its angular momentum. Can the fluxes of energy, momentum
and angular momentum along the cylinder also be so found? We derive the metric
of a beam of circularly polarized electromagnetic radiation from the
Einstein-Maxwell eq... | [
{
"created": "Tue, 19 Dec 2017 15:20:07 GMT",
"version": "v1"
}
] | 2017-12-20 | [
[
"Lynden-Bell",
"D.",
""
],
[
"Bičák",
"J.",
""
]
] | The mass per unit length of a cylindrical system can be found from its external metric as can its angular momentum. Can the fluxes of energy, momentum and angular momentum along the cylinder also be so found? We derive the metric of a beam of circularly polarized electromagnetic radiation from the Einstein-Maxwell equa... |
2111.14095 | Yingjie Li | Yingjie Li, Ye Xu, JingJing Li, Yuanwei Wu, Shaibo Bian, ZeHao Lin,
WenJin Yang, Chaojie Hao, and DeJian Liu | Light Deflection under the Gravitational Field of Jupiter -- Testing
General Relativity | 22 pages, 7 figures, 3 tables, accepted for publication in ApJ | null | 10.3847/1538-4357/ac3821 | null | gr-qc astro-ph.EP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We measured the relative positions between two pairs of compact extragalactic
sources (CESs), J1925-2219 \& J1923-2104 (C1--C2) and J1925-2219 \& J1928-2035
(C1--C3) on 2020 October 23--25 and 2021 February 5 (totaling four epochs),
respectively, using the Very Long Baseline Array (VLBA) at 15 GHz. Accounting
for the... | [
{
"created": "Sun, 28 Nov 2021 10:21:39 GMT",
"version": "v1"
}
] | 2022-02-02 | [
[
"Li",
"Yingjie",
""
],
[
"Xu",
"Ye",
""
],
[
"Li",
"JingJing",
""
],
[
"Wu",
"Yuanwei",
""
],
[
"Bian",
"Shaibo",
""
],
[
"Lin",
"ZeHao",
""
],
[
"Yang",
"WenJin",
""
],
[
"Hao",
"Chaojie",
... | We measured the relative positions between two pairs of compact extragalactic sources (CESs), J1925-2219 \& J1923-2104 (C1--C2) and J1925-2219 \& J1928-2035 (C1--C3) on 2020 October 23--25 and 2021 February 5 (totaling four epochs), respectively, using the Very Long Baseline Array (VLBA) at 15 GHz. Accounting for the d... |
gr-qc/0306074 | Johan Braennlund | Johan Br\"annlund | Conformal isometry of the Reissner-Nordstrom-de Sitter black hole | 4 pages | Gen.Rel.Grav. 36 (2004) 883-887 | 10.1023/B:GERG.0000017040.83045.f8 | null | gr-qc | null | It was pointed out by Couch and Torrence that the extreme Reissner-Nordstrom
solution possesses a discrete conformal isometry. Using results of Romans, it
is shown that such a symmetry also exists when a non-zero cosmological constant
is allowed.
| [
{
"created": "Mon, 16 Jun 2003 21:02:57 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Brännlund",
"Johan",
""
]
] | It was pointed out by Couch and Torrence that the extreme Reissner-Nordstrom solution possesses a discrete conformal isometry. Using results of Romans, it is shown that such a symmetry also exists when a non-zero cosmological constant is allowed. |
0801.4241 | Valentin Bonzom | Valentin Bonzom, Etera R. Livine | A Immirzi-like parameter for 3d quantum gravity | 14 pages, v2: one reference added, more comments on the 3d/4d
comparison | Class.Quant.Grav.25:195024,2008 | 10.1088/0264-9381/25/19/195024 | null | gr-qc | null | We study an Immirzi-like ambiguity in three-dimensional quantum gravity. It
shares some features with the Immirzi parameter of four-dimensional loop
quantum gravity: it does not affect the equations of motion, but modifies the
Poisson brackets and the constraint algebra at the canonical level. We focus on
the length ... | [
{
"created": "Mon, 28 Jan 2008 11:08:43 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jun 2008 09:16:03 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bonzom",
"Valentin",
""
],
[
"Livine",
"Etera R.",
""
]
] | We study an Immirzi-like ambiguity in three-dimensional quantum gravity. It shares some features with the Immirzi parameter of four-dimensional loop quantum gravity: it does not affect the equations of motion, but modifies the Poisson brackets and the constraint algebra at the canonical level. We focus on the length op... |
2105.14661 | Shinji Tsujikawa | Masato Minamitsuji, Shinji Tsujikawa | Spontaneous scalarization of charged stars | 14 pages, 3 figures | Physics Letters B 820 (2021) 136509 | 10.1016/j.physletb.2021.136509 | WUCG-21-05 | gr-qc hep-ph hep-th | http://creativecommons.org/licenses/by/4.0/ | We study static and spherically symmetric charged stars with a nontrivial
profile of the scalar field $\phi$ in Einstein-Maxwell-scalar theories. The
scalar field is coupled to a $U(1)$ gauge field $A_{\mu}$ with the form
$-\alpha(\phi)F_{\mu \nu}F^{\mu \nu}/4$, where $F_{\mu
\nu}=\partial_{\mu}A_{\nu}-\partial_{\nu}... | [
{
"created": "Mon, 31 May 2021 01:11:49 GMT",
"version": "v1"
}
] | 2022-08-02 | [
[
"Minamitsuji",
"Masato",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | We study static and spherically symmetric charged stars with a nontrivial profile of the scalar field $\phi$ in Einstein-Maxwell-scalar theories. The scalar field is coupled to a $U(1)$ gauge field $A_{\mu}$ with the form $-\alpha(\phi)F_{\mu \nu}F^{\mu \nu}/4$, where $F_{\mu \nu}=\partial_{\mu}A_{\nu}-\partial_{\nu} A... |
2012.08136 | Shad Ali | Shad Ali, Muhammad Arshad Kamran, and Misbah Ullah Khan | Information evolution in the interior of an axially symmetric BTZ black
hole | 11 Pages, 3 figures, Journal Article Phys. Scr. (2022) | Shad Ali et al 2022 Phys. Scr. 97 045005 | 10.1088/1402-4896/ac5af3 | null | gr-qc hep-ph | http://creativecommons.org/licenses/by/4.0/ | In this paper, we consider an axially symmetric $(2+1)-$dimensional rotating
Banados-Teitelboim-Zanelli (BTZ) black hole to investigate its interior
\textbf{information}. First, we choose a largest space-like hyper-surface at
$r_v=0.45$ and calculate the maximal interior volume bound by it. We found the
interior volu... | [
{
"created": "Tue, 15 Dec 2020 07:48:39 GMT",
"version": "v1"
},
{
"created": "Sat, 5 Mar 2022 07:26:53 GMT",
"version": "v2"
}
] | 2022-03-16 | [
[
"Ali",
"Shad",
""
],
[
"Kamran",
"Muhammad Arshad",
""
],
[
"Khan",
"Misbah Ullah",
""
]
] | In this paper, we consider an axially symmetric $(2+1)-$dimensional rotating Banados-Teitelboim-Zanelli (BTZ) black hole to investigate its interior \textbf{information}. First, we choose a largest space-like hyper-surface at $r_v=0.45$ and calculate the maximal interior volume bound by it. We found the interior volume... |
gr-qc/0504084 | Serge Winitzki | Sergei Winitzki | Time-reparametrization invariance in eternal inflation | version accepted by Phys.Rev.D, minor additions and clarifications
suggested by the referee | Phys.Rev. D71 (2005) 123507 | 10.1103/PhysRevD.71.123507 | null | gr-qc astro-ph hep-th | null | I address some recently raised issues regarding the time-parametrization
dependence in stochastic descriptions of eternal inflation. To clarify the role
of the choice of the time gauge, I show examples of gauge-dependent as well as
gauge-independent statements about physical observables in eternally inflating
spaceti... | [
{
"created": "Tue, 19 Apr 2005 15:38:55 GMT",
"version": "v1"
},
{
"created": "Mon, 16 May 2005 22:06:13 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Winitzki",
"Sergei",
""
]
] | I address some recently raised issues regarding the time-parametrization dependence in stochastic descriptions of eternal inflation. To clarify the role of the choice of the time gauge, I show examples of gauge-dependent as well as gauge-independent statements about physical observables in eternally inflating spacetime... |
1903.03842 | Adrien Kuntz | Philippe Brax, Anne-Christine Davis, Adrien Kuntz | Disformally Coupled Scalar Fields and Inspiralling Trajectories | 24 pages, 3 figures | Phys. Rev. D 99, 124034 (2019) | 10.1103/PhysRevD.99.124034 | null | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show how a nearly massless scalar field conformally and disformally
coupled to matter can affect the dynamics of two bodies in their inspiralling
phase before merging. We discuss both the conservative dynamics, e.g. how the
energy of the bound system is corrected by the conformal and disformal
interactions, and th... | [
{
"created": "Sat, 9 Mar 2019 18:10:57 GMT",
"version": "v1"
},
{
"created": "Mon, 18 Mar 2019 20:58:49 GMT",
"version": "v2"
}
] | 2019-07-03 | [
[
"Brax",
"Philippe",
""
],
[
"Davis",
"Anne-Christine",
""
],
[
"Kuntz",
"Adrien",
""
]
] | We show how a nearly massless scalar field conformally and disformally coupled to matter can affect the dynamics of two bodies in their inspiralling phase before merging. We discuss both the conservative dynamics, e.g. how the energy of the bound system is corrected by the conformal and disformal interactions, and the ... |
1603.08629 | Narayan Banerjee | Soumya Chakrabarti and Narayan Banerjee | Spherically symmetric collapse of a perfect fluid in f(R) gravity | 8 pages, no figure; accepted for publication in GRG journal | null | 10.1007/s10714-016-2045-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work investigates the gravitational collapse of a perfect fluid
in $f(R)$ gravity models. For a general $f(R)$ theory, it is shown analytically
that a collapse is quite possible. The singularity formed as a result of the
collapse is found to be a curvature singularity of shell focusing type. The
possibili... | [
{
"created": "Tue, 29 Mar 2016 03:53:33 GMT",
"version": "v1"
}
] | 2016-03-30 | [
[
"Chakrabarti",
"Soumya",
""
],
[
"Banerjee",
"Narayan",
""
]
] | The present work investigates the gravitational collapse of a perfect fluid in $f(R)$ gravity models. For a general $f(R)$ theory, it is shown analytically that a collapse is quite possible. The singularity formed as a result of the collapse is found to be a curvature singularity of shell focusing type. The possibility... |
gr-qc/0311075 | Eugen Radu | Eugen Radu and Reinoud J. Slagter | Melvin solution with a dilaton potential | 12 pages, LaTeX, no figures | Class.Quant.Grav. 21 (2004) 2379-2391 | 10.1088/0264-9381/21/9/012 | FREIBURG-THEP-03-21 | gr-qc | null | We find new Melvin-like solutions in Einstein-Maxwell-dilaton gravity with a
Liouville-type dilaton potential. The properties of the corresponding solution
in Freedman-Schwarz gauged supergravity model are extensively studied. We show
that this configuration is regular and geodesically complete but do not
preserve an... | [
{
"created": "Fri, 21 Nov 2003 11:53:54 GMT",
"version": "v1"
},
{
"created": "Sun, 28 Mar 2004 09:59:12 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Radu",
"Eugen",
""
],
[
"Slagter",
"Reinoud J.",
""
]
] | We find new Melvin-like solutions in Einstein-Maxwell-dilaton gravity with a Liouville-type dilaton potential. The properties of the corresponding solution in Freedman-Schwarz gauged supergravity model are extensively studied. We show that this configuration is regular and geodesically complete but do not preserve any ... |
1109.3593 | Gil Jannes | Luis C. Barbado, Carlos Barcel\'o, Luis J. Garay, Gil Jannes | The trans-Planckian problem as a guiding principle | 20 pages, 4 figures. v2: minor clarifications. Published version | JHEP 11, 112 (2011) | 10.1007/JHEP11(2011)112 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the avoidance of the trans-Planckian problem of Hawking radiation as a
guiding principle in searching for a compelling scenario for the evaporation of
black holes or black-hole-like objects. We argue that there exist only three
possible scenarios, depending on whether the classical notion of long-lived
horizon... | [
{
"created": "Fri, 16 Sep 2011 12:07:08 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Nov 2011 08:11:05 GMT",
"version": "v2"
}
] | 2011-12-01 | [
[
"Barbado",
"Luis C.",
""
],
[
"Barceló",
"Carlos",
""
],
[
"Garay",
"Luis J.",
""
],
[
"Jannes",
"Gil",
""
]
] | We use the avoidance of the trans-Planckian problem of Hawking radiation as a guiding principle in searching for a compelling scenario for the evaporation of black holes or black-hole-like objects. We argue that there exist only three possible scenarios, depending on whether the classical notion of long-lived horizon i... |
0801.3364 | Mike Scherfner | M. Plaue, M. Scherfner, L.A.M. de Sousa Jr | On Spacetimes with Given Kinematical Invariants: Construction and
Examples | null | null | null | null | gr-qc | null | We present a useful method for the construction of cosmological models by
solving the differential equations arising from calculating the kinematical
invariants (shear, rotation, expansion and acceleration) of an observer field
in proper time description. As an application of our method we present two
generalizations... | [
{
"created": "Tue, 22 Jan 2008 13:40:38 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Jan 2008 13:24:40 GMT",
"version": "v2"
}
] | 2008-01-24 | [
[
"Plaue",
"M.",
""
],
[
"Scherfner",
"M.",
""
],
[
"Sousa",
"L. A. M. de",
"Jr"
]
] | We present a useful method for the construction of cosmological models by solving the differential equations arising from calculating the kinematical invariants (shear, rotation, expansion and acceleration) of an observer field in proper time description. As an application of our method we present two generalizations o... |
1701.03950 | Ivan Kolar | Ivan Kolar, Pavel Krtous | NUT-like and near-horizon limits of Kerr-NUT-(A)dS spacetimes | 22 pages, 8 figures | Phys. Rev. D 95, 124044 (2017) | 10.1103/PhysRevD.95.124044 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a class of limits of the higher-dimensional Kerr-NUT-(A)dS
spacetimes where particular roots of metric functions degenerate. Namely, we
obtain the Taub-NUT-(A)dS and the extreme near-horizon geometries as two
examples of our limiting procedure. The symmetries of the resulting spacetimes
are enhanced which is... | [
{
"created": "Sat, 14 Jan 2017 17:17:10 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Jul 2017 16:53:37 GMT",
"version": "v2"
}
] | 2017-07-06 | [
[
"Kolar",
"Ivan",
""
],
[
"Krtous",
"Pavel",
""
]
] | We study a class of limits of the higher-dimensional Kerr-NUT-(A)dS spacetimes where particular roots of metric functions degenerate. Namely, we obtain the Taub-NUT-(A)dS and the extreme near-horizon geometries as two examples of our limiting procedure. The symmetries of the resulting spacetimes are enhanced which is m... |
1509.06171 | Jose Manuel Velhinho | Jeronimo Cortez, Guillermo A. Mena Marugan, Jose M. Velhinho | Quantum unitary dynamics in cosmological spacetimes | 18 pages | Annals Phys. 363 (2015) 36-47 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We address the question of unitary implementation of the dynamics for scalar
fields in cosmological scenarios. Together with invariance under spatial
isometries, the requirement of a unitary evolution singles out a rescaling of
the scalar field and a unitary equivalence class of Fock representations for
the associate... | [
{
"created": "Mon, 21 Sep 2015 10:11:32 GMT",
"version": "v1"
}
] | 2015-10-16 | [
[
"Cortez",
"Jeronimo",
""
],
[
"Marugan",
"Guillermo A. Mena",
""
],
[
"Velhinho",
"Jose M.",
""
]
] | We address the question of unitary implementation of the dynamics for scalar fields in cosmological scenarios. Together with invariance under spatial isometries, the requirement of a unitary evolution singles out a rescaling of the scalar field and a unitary equivalence class of Fock representations for the associated ... |
1705.03958 | Gabriel Leon | Gabriel Leon | Eternal inflation and the quantum birth of cosmic structure | 11 pages plus references. Replaced to match published version | Eur. Phys. J. C 77 (2017) 705 | 10.1140/epjc/s10052-017-5288-5 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the eternal inflation scenario of the slow-roll/chaotic type with
the additional element of an objective collapse of the wave function. The
incorporation of this new agent to the traditional inflationary setting might
represent a possible solution to the quantum measurement problem during
inflation, a sub... | [
{
"created": "Wed, 10 May 2017 21:30:47 GMT",
"version": "v1"
},
{
"created": "Sun, 14 May 2017 20:03:15 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Oct 2017 22:48:52 GMT",
"version": "v3"
}
] | 2017-10-27 | [
[
"Leon",
"Gabriel",
""
]
] | We consider the eternal inflation scenario of the slow-roll/chaotic type with the additional element of an objective collapse of the wave function. The incorporation of this new agent to the traditional inflationary setting might represent a possible solution to the quantum measurement problem during inflation, a subje... |
2308.08923 | Bivudutta Mishra Dr. | S. K. Tripathy, D. Nayak, B. Mishra, D. Behera, S. K. Sahu | Existence of non-exotic traversable wormholes in squared trace extended
gravity theory | 12 pages, 8 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An extended gravity theory is used to explore the possibility of non-exotic
matter traversable wormholes. In the extended gravity theory, additional terms
linear and quadratic in the trace of the energy momentum tensor are considered
in the Einstein-Hilbert action. Obviously, such an addition leads to violation
of th... | [
{
"created": "Thu, 17 Aug 2023 11:27:05 GMT",
"version": "v1"
}
] | 2024-04-10 | [
[
"Tripathy",
"S. K.",
""
],
[
"Nayak",
"D.",
""
],
[
"Mishra",
"B.",
""
],
[
"Behera",
"D.",
""
],
[
"Sahu",
"S. K.",
""
]
] | An extended gravity theory is used to explore the possibility of non-exotic matter traversable wormholes. In the extended gravity theory, additional terms linear and quadratic in the trace of the energy momentum tensor are considered in the Einstein-Hilbert action. Obviously, such an addition leads to violation of the ... |
gr-qc/9501008 | Carsten Gundlach | Carsten Gundlach (LAEFF-INTA, Madrid) | Bekenstein-Hawking entropy from a phenomenological membrane | 1 journal page, Revtex | null | null | LAEFF-95/2 | gr-qc | null | It is pointed out that the entropy of a membrane which is quantized
perturbatively around a background position of fixed radius in a black hole
spacetime is equal to the Bekenstein-Hawking entropy, if 1) the membrane
surface is the horizon surface plus one Planck unit, and 2) its temperature is
the Hawking temperatur... | [
{
"created": "Tue, 10 Jan 1995 11:43:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Gundlach",
"Carsten",
"",
"LAEFF-INTA, Madrid"
]
] | It is pointed out that the entropy of a membrane which is quantized perturbatively around a background position of fixed radius in a black hole spacetime is equal to the Bekenstein-Hawking entropy, if 1) the membrane surface is the horizon surface plus one Planck unit, and 2) its temperature is the Hawking temperature.... |
1807.09057 | Cristiano Germani | Diego Cruces, Cristiano Germani and Tomislav Prokopec | Failure of the stochastic approach to inflation beyond slow-roll | v3: typo in the appendix corrected. Results unchanged. Published
version in JCAP | null | 10.1088/1475-7516/2019/03/048 | ICCUB-18-015 | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After giving a pedagogical review we clarify that the stochastic approach to
inflation is generically reliable only at zeroth order in the (geometrical)
slow-roll parameter $\epsilon_1$ if and only if $\epsilon_2^2\ll 6/\epsilon_1$,
with the notable exception of slow-roll. This is due to the failure of the
stochastic... | [
{
"created": "Tue, 24 Jul 2018 12:05:31 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Mar 2019 13:44:22 GMT",
"version": "v2"
},
{
"created": "Mon, 1 Apr 2019 14:53:54 GMT",
"version": "v3"
}
] | 2019-04-10 | [
[
"Cruces",
"Diego",
""
],
[
"Germani",
"Cristiano",
""
],
[
"Prokopec",
"Tomislav",
""
]
] | After giving a pedagogical review we clarify that the stochastic approach to inflation is generically reliable only at zeroth order in the (geometrical) slow-roll parameter $\epsilon_1$ if and only if $\epsilon_2^2\ll 6/\epsilon_1$, with the notable exception of slow-roll. This is due to the failure of the stochastic $... |
1908.02247 | N V Krishnendu | N. V. Krishnendu, M. Saleem, A. Samajdar, K. G. Arun, W. Del Pozzo,
Chandra Kant Mishra | Constraints on the binary black hole nature of GW151226 and GW170608
from the measurement of spin-induced quadrupole moments | 12 pages, 5 figures Accepted for publication in PRD. Journal
reference:Phys. Rev. D 100, 104019, 2019 | Phys. Rev. D 100, 104019 (2019) | 10.1103/PhysRevD.100.104019 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | According to the "no-hair" conjecture, a Kerr black hole (BH) is completely
described by its mass and spin. In particular, the spin-induced quadrupole
moment of a Kerr BH with mass $m$ and dimensionless spin $\chi$ can be written
as $Q=-\kappa\,m^3\chi^2$, where $\kappa_{\rm BH}=1$. Thus by measuring the
spin-induced... | [
{
"created": "Tue, 6 Aug 2019 16:36:45 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Nov 2019 06:24:31 GMT",
"version": "v2"
}
] | 2019-11-20 | [
[
"Krishnendu",
"N. V.",
""
],
[
"Saleem",
"M.",
""
],
[
"Samajdar",
"A.",
""
],
[
"Arun",
"K. G.",
""
],
[
"Del Pozzo",
"W.",
""
],
[
"Mishra",
"Chandra Kant",
""
]
] | According to the "no-hair" conjecture, a Kerr black hole (BH) is completely described by its mass and spin. In particular, the spin-induced quadrupole moment of a Kerr BH with mass $m$ and dimensionless spin $\chi$ can be written as $Q=-\kappa\,m^3\chi^2$, where $\kappa_{\rm BH}=1$. Thus by measuring the spin-induced q... |
gr-qc/0201061 | Santiago Esteban Perez Bergliaffa | M. Novello, S. Perez Bergliaffa, J. Salim, V. De Lorenci and R.
Klippert | Analog black holes in flowing dielectrics | Revtex4 file, 7 pages, 4 eps figures, a few changes in presentation,
some references added, conclusions unchanged | Class.Quant.Grav. 20 (2003) 859-872 | 10.1088/0264-9381/20/5/306 | null | gr-qc physics.optics | null | We show that a flowing dielectric medium with a linear response to an
external electric field can be used to generate an analog geometry that has
many of the formal properties of a Schwarzschild black hole for light rays, in
spite of birefringence. We also discuss the possibility of generating these
analog black hole... | [
{
"created": "Fri, 18 Jan 2002 16:23:04 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Mar 2002 11:57:53 GMT",
"version": "v2"
},
{
"created": "Wed, 8 May 2002 17:29:30 GMT",
"version": "v3"
},
{
"created": "Tue, 21 Jan 2003 18:51:26 GMT",
"version": "v4"
}
] | 2017-08-23 | [
[
"Novello",
"M.",
""
],
[
"Bergliaffa",
"S. Perez",
""
],
[
"Salim",
"J.",
""
],
[
"De Lorenci",
"V.",
""
],
[
"Klippert",
"R.",
""
]
] | We show that a flowing dielectric medium with a linear response to an external electric field can be used to generate an analog geometry that has many of the formal properties of a Schwarzschild black hole for light rays, in spite of birefringence. We also discuss the possibility of generating these analog black holes ... |
0707.3319 | Leonid Grishchuk P | L. P. Grishchuk | Discovering Relic Gravitational Waves in Cosmic Microwave Background
Radiation | 43 pages including 9 figures, based on an invited lecture at the
first J.A.Wheeler School on Astrophysical Relativity, June 2006. v4: 54
pages, updates and improvements in proofs for publication in "General
Relativity and John Archibald Wheeler", see link | null | null | null | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The authority of J. A. Wheeler in many areas of gravitational physics is
immense, and there is a connection with the study of relic gravitational waves
as well. I begin with a brief description of Wheeler's influence on this study.
One part of the paper is essentially a detailed justification of the very
existence of... | [
{
"created": "Mon, 23 Jul 2007 15:10:08 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Oct 2007 15:17:54 GMT",
"version": "v2"
},
{
"created": "Wed, 21 May 2008 16:29:36 GMT",
"version": "v3"
},
{
"created": "Sun, 7 Mar 2010 22:50:39 GMT",
"version": "v4"
}
] | 2010-03-09 | [
[
"Grishchuk",
"L. P.",
""
]
] | The authority of J. A. Wheeler in many areas of gravitational physics is immense, and there is a connection with the study of relic gravitational waves as well. I begin with a brief description of Wheeler's influence on this study. One part of the paper is essentially a detailed justification of the very existence of r... |
1810.13260 | Sourav Bhattacharya | Sourav Bhattacharya | Particle creation by de Sitter black holes revisited | v2; 19pp, 3 figures; added references and discussions, improved
presentation; accepted in PRD | Phys. Rev. D 98, 125013 (2018) | 10.1103/PhysRevD.98.125013 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Creation of thermal distribution of particles by a black hole is independent
of the detail of gravitational collapse, making the construction of the eternal
horizons suffice to address the problem in asymptotically flat spacetimes. For
eternal de Sitter black holes however, earlier studies have shown the existence
of... | [
{
"created": "Wed, 31 Oct 2018 12:58:30 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Dec 2018 11:05:55 GMT",
"version": "v2"
}
] | 2019-01-02 | [
[
"Bhattacharya",
"Sourav",
""
]
] | Creation of thermal distribution of particles by a black hole is independent of the detail of gravitational collapse, making the construction of the eternal horizons suffice to address the problem in asymptotically flat spacetimes. For eternal de Sitter black holes however, earlier studies have shown the existence of b... |
1512.09118 | Alexander Vikman | Katrin Hammer and Alexander Vikman | Many Faces of Mimetic Gravity | 10 pages, no figures | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the recently introduced mimetic gravity, which is a
Weyl-symmetric extension of the General Relativity and which can play a role of
an imperfect fluid-like Dark Matter with a small sound speed. In this paper we
discuss in details how this higher- derivative scalar-tensor theory goes beyond
the constructio... | [
{
"created": "Wed, 30 Dec 2015 20:50:08 GMT",
"version": "v1"
}
] | 2015-12-31 | [
[
"Hammer",
"Katrin",
""
],
[
"Vikman",
"Alexander",
""
]
] | We consider the recently introduced mimetic gravity, which is a Weyl-symmetric extension of the General Relativity and which can play a role of an imperfect fluid-like Dark Matter with a small sound speed. In this paper we discuss in details how this higher- derivative scalar-tensor theory goes beyond the construction ... |
gr-qc/0603080 | Recai Erdem | Recai Erdem | A symmetry for vanishing cosmological constant: Another realization | The version to appear in PLB. The terms "non-orientable space" and
"extra-dimensional tranlation" are replaced by "space whose volume element
changes sign under extra dimensional reflections" and "extra dimensional
reflections", respectively; and typos are corrected | Phys.Lett. B639 (2006) 348-353 | 10.1016/j.physletb.2006.06.056 | IZTECH-P-2006-03 | gr-qc hep-ph hep-th | null | A more conventional realization of a symmetry which had been proposed towards
the solution of cosmological constant problem is considered. In this study the
multiplication of the coordinates by the imaginary number $i$ in the literature
is replaced by the multiplication of the metric tensor by minus one. This
realiza... | [
{
"created": "Mon, 20 Mar 2006 14:27:47 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jun 2006 14:30:37 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Erdem",
"Recai",
""
]
] | A more conventional realization of a symmetry which had been proposed towards the solution of cosmological constant problem is considered. In this study the multiplication of the coordinates by the imaginary number $i$ in the literature is replaced by the multiplication of the metric tensor by minus one. This realizati... |
2204.03279 | Viacheslav A. Emelyanov | Viacheslav A. Emelyanov | Free-fall non-universality in quantum theory | typos fixed, published version | Annalen der Physik 535 (2023) 2200386 | 10.1002/andp.202200386 | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | We show by embodying the Einstein equivalence principle - local Poincar\'{e}
invariance - and general covariance in quantum theory that wave-function
spreading rules out the universality of free fall, i.e. the free-fall
trajectory of a quantum (test) particle depends on its internal properties. We
provide a quantitat... | [
{
"created": "Thu, 7 Apr 2022 08:09:05 GMT",
"version": "v1"
},
{
"created": "Thu, 26 May 2022 13:34:29 GMT",
"version": "v2"
},
{
"created": "Thu, 23 Feb 2023 10:06:13 GMT",
"version": "v3"
},
{
"created": "Mon, 29 May 2023 10:20:44 GMT",
"version": "v4"
}
] | 2023-05-30 | [
[
"Emelyanov",
"Viacheslav A.",
""
]
] | We show by embodying the Einstein equivalence principle - local Poincar\'{e} invariance - and general covariance in quantum theory that wave-function spreading rules out the universality of free fall, i.e. the free-fall trajectory of a quantum (test) particle depends on its internal properties. We provide a quantitativ... |
1509.01188 | Jose Beltran Jimenez | Jose Beltran Jimenez, Lavinia Heisenberg, Gonzalo J. Olmo and
Christophe Ringeval | Cascading dust inflation in Born-Infeld gravity | 28 pages, 4 figures | JCAP 1511:046,2016 | 10.1088/1475-7516/2015/11/046 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the framework of Born-Infeld inspired gravity theories, which deviates
from General Relativity (GR) in the high curvature regime, we discuss the
viability of Cosmic Inflation without scalar fields. For energy densities
higher than the new mass scale of the theory, a gravitating dust component is
shown to generical... | [
{
"created": "Wed, 2 Sep 2015 17:41:28 GMT",
"version": "v1"
},
{
"created": "Fri, 4 Sep 2015 14:49:27 GMT",
"version": "v2"
}
] | 2016-03-10 | [
[
"Jimenez",
"Jose Beltran",
""
],
[
"Heisenberg",
"Lavinia",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Ringeval",
"Christophe",
""
]
] | In the framework of Born-Infeld inspired gravity theories, which deviates from General Relativity (GR) in the high curvature regime, we discuss the viability of Cosmic Inflation without scalar fields. For energy densities higher than the new mass scale of the theory, a gravitating dust component is shown to generically... |
0903.4119 | Nakia Carlevaro | Nakia Carlevaro, Giovanni Montani | A Novel Approach to Lorentz Gauge Theory | 5 pages, no figures | Proc. of The 3rd Stueckelberg Workshop on Relativistic Field
Theories, p. 149 (Cambridge Sci. Pub, 2010) | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is devoted to introduce a gauge theory of the Lorentz Group based
on the analysis of isometric diffeomorphism-induced Lorentz transformations.
The behaviors under local transformations of fermion fields and spin
connections (assumed to be coordinate vectors) are analyzed and the role of the
torsion field i... | [
{
"created": "Tue, 24 Mar 2009 16:24:27 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Dec 2015 11:55:21 GMT",
"version": "v2"
}
] | 2015-12-31 | [
[
"Carlevaro",
"Nakia",
""
],
[
"Montani",
"Giovanni",
""
]
] | This paper is devoted to introduce a gauge theory of the Lorentz Group based on the analysis of isometric diffeomorphism-induced Lorentz transformations. The behaviors under local transformations of fermion fields and spin connections (assumed to be coordinate vectors) are analyzed and the role of the torsion field in ... |
2103.09597 | Albert Munyeshyaka Mr | Albert Munyeshyaka, Joseph Ntahompagaze, and Tom Mutabazi | Cosmological perturbations in f(G) gravity | 32 pages, 9 figures | null | 10.1142/S021827182150053X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore cosmological perturbations in a modified Gauss-Bonnet f(G)
gravity, using a 1+3 covariant formalism. In such a formalism, we define
gradient variables to get perturbed linear evolution equations. We transform
these linear evolution equations into ordinary differential equations using a
spherical harmonic d... | [
{
"created": "Wed, 17 Mar 2021 12:26:25 GMT",
"version": "v1"
}
] | 2022-09-20 | [
[
"Munyeshyaka",
"Albert",
""
],
[
"Ntahompagaze",
"Joseph",
""
],
[
"Mutabazi",
"Tom",
""
]
] | We explore cosmological perturbations in a modified Gauss-Bonnet f(G) gravity, using a 1+3 covariant formalism. In such a formalism, we define gradient variables to get perturbed linear evolution equations. We transform these linear evolution equations into ordinary differential equations using a spherical harmonic dec... |
1911.04756 | Gerardo Morsella | Sergio Doplicher, Gerardo Morsella, Nicola Pinamonti | Quantum Spacetime and the Universe at the Big Bang, vanishing
interactions and fading degrees of freedom | 14 pages | null | 10.1007/s11040-020-09369-9 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As discussed in arXiv:1501.03298, Physics suggests that, close to
cosmological singularities, the effective Planck length diverges, hence a
"quantum point" becomes infinitely extended. We argue that, as a consequence,
at the origin of times spacetime might reduce effectively to a single point and
interactions disappe... | [
{
"created": "Tue, 12 Nov 2019 09:37:32 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Apr 2020 15:46:13 GMT",
"version": "v2"
}
] | 2020-12-30 | [
[
"Doplicher",
"Sergio",
""
],
[
"Morsella",
"Gerardo",
""
],
[
"Pinamonti",
"Nicola",
""
]
] | As discussed in arXiv:1501.03298, Physics suggests that, close to cosmological singularities, the effective Planck length diverges, hence a "quantum point" becomes infinitely extended. We argue that, as a consequence, at the origin of times spacetime might reduce effectively to a single point and interactions disappear... |
1909.11801 | Bob Holdom | Bob Holdom | Not quite black holes at LIGO | 20 pages, 16 figures, published version | Phys. Rev. D 101, 064063 (2020) | 10.1103/PhysRevD.101.064063 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide more evidence of not quite black holes at LIGO. We update and
streamline our previous search strategy and apply it to the ten black hole
merger events and the one neutron star merger event. The strategy is aimed at
the evenly spaced resonance spectrum expected from not quite black holes, given
that at low ... | [
{
"created": "Wed, 25 Sep 2019 22:36:35 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Mar 2020 16:29:32 GMT",
"version": "v2"
}
] | 2020-03-30 | [
[
"Holdom",
"Bob",
""
]
] | We provide more evidence of not quite black holes at LIGO. We update and streamline our previous search strategy and apply it to the ten black hole merger events and the one neutron star merger event. The strategy is aimed at the evenly spaced resonance spectrum expected from not quite black holes, given that at low fr... |
2107.01599 | Fabiano Feleppa | Fabrizio Tamburini, Fabiano Feleppa, Bo Thid\'e | Twisted light, a new tool for General Relativity and beyond | This essay received an Honorable Mention in the 2021 Essay
Competition of the Gravity Research Foundation. v2: published version | International Journal of Modern Physics D, 2142017 (2021) | 10.1142/S0218271821420177 | null | gr-qc astro-ph.HE astro-ph.IM physics.optics | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe and present the first observational evidence that light
propagating near a rotating black hole is twisted in phase and carries orbital
angular momentum. The novel use of this physical observable as an additional
tool for the previously known techniques of gravitational lensing allows us to
directly measur... | [
{
"created": "Sun, 4 Jul 2021 11:47:49 GMT",
"version": "v1"
},
{
"created": "Sat, 30 Oct 2021 13:49:29 GMT",
"version": "v2"
}
] | 2021-11-02 | [
[
"Tamburini",
"Fabrizio",
""
],
[
"Feleppa",
"Fabiano",
""
],
[
"Thidé",
"Bo",
""
]
] | We describe and present the first observational evidence that light propagating near a rotating black hole is twisted in phase and carries orbital angular momentum. The novel use of this physical observable as an additional tool for the previously known techniques of gravitational lensing allows us to directly measure,... |
gr-qc/0305027 | Mark A. Scheel | Mark A. Scheel (1), Adrienne L. Erickcek (2), Lior M. Burko (3),
Lawrence E. Kidder (4), Harald P. Pfeiffer (4), and Saul A. Teukolsky (4)
((1) California Institute of Technology, (2) Princeton University, (3)
University of Utah, (4) Cornell University) | 3D simulations of linearized scalar fields in Kerr spacetime | 12 pages, 9 figures, revtex4. Major revision: added figures, added
subsection on convergence, clarified discussion. To appear in Phys Rev D | Phys.Rev. D69 (2004) 104006 | 10.1103/PhysRevD.69.104006 | null | gr-qc | null | We investigate the behavior of a dynamical scalar field on a fixed Kerr
background in Kerr-Schild coordinates using a 3+1 dimensional spectral
evolution code, and we measure the power-law tail decay that occurs at late
times. We compare evolutions of initial data proportional to f(r)
Y_lm(theta,phi) where Y_lm is a s... | [
{
"created": "Tue, 6 May 2003 23:43:55 GMT",
"version": "v1"
},
{
"created": "Fri, 30 Jan 2004 20:47:41 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Scheel",
"Mark A.",
""
],
[
"Erickcek",
"Adrienne L.",
""
],
[
"Burko",
"Lior M.",
""
],
[
"Kidder",
"Lawrence E.",
""
],
[
"Pfeiffer",
"Harald P.",
""
],
[
"Teukolsky",
"Saul A.",
""
]
] | We investigate the behavior of a dynamical scalar field on a fixed Kerr background in Kerr-Schild coordinates using a 3+1 dimensional spectral evolution code, and we measure the power-law tail decay that occurs at late times. We compare evolutions of initial data proportional to f(r) Y_lm(theta,phi) where Y_lm is a sph... |
1309.7496 | Hoda Farahani | J. Sadeghi, M. Khurshudyan, M. Hakobyan and H. Farahani | Mutually interacting Tachyon dark energy with variable $G$ and $\Lambda$ | 17 pages, accepted by Research in Astronomy and Astrophysics (RAA).
arXiv admin note: text overlap with arXiv:1402.2592 by other authors | Res. Astron. Astrophys. 15 (2015) 175 | 10.1088/1674-4527/15/2/002 | null | gr-qc hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider Tachyonic scalar field as dark energy with
interaction between components in the case of variable $G$ and $\Lambda$. We
assume a flat Universe with specific form of scale factor and study
cosmological parameters numerically and graphically. Statefinder analysis also
performed as well. In the... | [
{
"created": "Sat, 28 Sep 2013 19:43:33 GMT",
"version": "v1"
},
{
"created": "Tue, 20 May 2014 08:17:00 GMT",
"version": "v2"
}
] | 2015-02-03 | [
[
"Sadeghi",
"J.",
""
],
[
"Khurshudyan",
"M.",
""
],
[
"Hakobyan",
"M.",
""
],
[
"Farahani",
"H.",
""
]
] | In this paper we consider Tachyonic scalar field as dark energy with interaction between components in the case of variable $G$ and $\Lambda$. We assume a flat Universe with specific form of scale factor and study cosmological parameters numerically and graphically. Statefinder analysis also performed as well. In the s... |
1410.8316 | Mairi Sakellariadou | S. Capozziello, G. Lambiase, M. Sakellariadou, An. Stabile, Ar.
Stabile | Probing Models of Extended Gravity using Gravity Probe B and LARES
experiments | 17 pages, 2 figures | Phys. Rev. D 91, 044012 (2015) | 10.1103/PhysRevD.91.044012 | KCL-PH-TH/2014-47 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider models of Extended Gravity and in particular, generic models
containing scalar-tensor and higher-order curvature terms, as well as a model
derived from noncommutative spectral geometry. Studying, in the weak-field
approximation, the geodesic and Lense-Thirring processions, we impose
constraints on the fre... | [
{
"created": "Thu, 30 Oct 2014 10:27:58 GMT",
"version": "v1"
}
] | 2015-02-12 | [
[
"Capozziello",
"S.",
""
],
[
"Lambiase",
"G.",
""
],
[
"Sakellariadou",
"M.",
""
],
[
"Stabile",
"An.",
""
],
[
"Stabile",
"Ar.",
""
]
] | We consider models of Extended Gravity and in particular, generic models containing scalar-tensor and higher-order curvature terms, as well as a model derived from noncommutative spectral geometry. Studying, in the weak-field approximation, the geodesic and Lense-Thirring processions, we impose constraints on the free ... |
1112.4168 | Lorenzo Iorio | Lorenzo Iorio | Constraining the angular momentum of the Sun with planetary orbital
motions and general relativity | Latex2e, 14 pages, 2 tables, no figures. Merged with ArXiv:1109.0266.
Accepted by Solar Physics. Small editing corrections | Solar Phys. 281:815-826,2012 | 10.1007/s11207-012-0086-6 | null | gr-qc astro-ph.EP physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The angular momentum of a star is an important astrophysical quantity related
to its internal structure, formation and evolution. On average, helioseismology
yields S = 1.92 10^41 kg m^2 s^-1 for the angular momentum of the Sun. We show
how it should be possible to measure or, at least, constrain it in a near
future ... | [
{
"created": "Sun, 18 Dec 2011 16:38:57 GMT",
"version": "v1"
},
{
"created": "Mon, 2 Jan 2012 23:01:12 GMT",
"version": "v2"
},
{
"created": "Tue, 1 May 2012 09:00:16 GMT",
"version": "v3"
},
{
"created": "Wed, 18 Jul 2012 22:22:42 GMT",
"version": "v4"
},
{
"cre... | 2016-11-25 | [
[
"Iorio",
"Lorenzo",
""
]
] | The angular momentum of a star is an important astrophysical quantity related to its internal structure, formation and evolution. On average, helioseismology yields S = 1.92 10^41 kg m^2 s^-1 for the angular momentum of the Sun. We show how it should be possible to measure or, at least, constrain it in a near future by... |
2208.02506 | Morgan Le Delliou | M. Le Delliou | Advanced General Relativity Notes | 164pp, 40figs. Lecture notes for Graduates with GR1 knowledge.
Feedback appreciated | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | These lecture notes are intended as a guide to Graduate level readers that
are already familiar with basic General Relativity. They present in a concise
way some advanced concepts and problems encountered in the study of
gravitation. In these notes are covered: Alternates forms of the Schwarzschild
Black Hole solutio... | [
{
"created": "Thu, 4 Aug 2022 07:37:06 GMT",
"version": "v1"
}
] | 2022-08-05 | [
[
"Delliou",
"M. Le",
""
]
] | These lecture notes are intended as a guide to Graduate level readers that are already familiar with basic General Relativity. They present in a concise way some advanced concepts and problems encountered in the study of gravitation. In these notes are covered: Alternates forms of the Schwarzschild Black Hole solution,... |
gr-qc/9509060 | Waldemar Puszkarz | Waldemar Puszkarz | Gravitational scattering on a global monopole reexamined | Latex, 10 pages. An extended critique of literature on the studied
topic and new references are added. Submitted to Phys. Rev. D | null | null | null | gr-qc hep-th | null | We critically reexamine the gravitational scattering of scalar particles on a
global monopole studied recently. The original investigation of Mazur and
Papavassiliou is extended by considering different couplings of the scalar
field to the space-time curvature and by varying the dimension of the
space-time where the ... | [
{
"created": "Sun, 1 Oct 1995 19:52:23 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Nov 1995 02:01:21 GMT",
"version": "v2"
}
] | 2008-02-03 | [
[
"Puszkarz",
"Waldemar",
""
]
] | We critically reexamine the gravitational scattering of scalar particles on a global monopole studied recently. The original investigation of Mazur and Papavassiliou is extended by considering different couplings of the scalar field to the space-time curvature and by varying the dimension of the space-time where the Kl... |
2205.09979 | Matteo Breschi | Matteo Breschi, Rossella Gamba, Ssohrab Borhanian, Gregorio Carullo,
Sebastiano Bernuzzi | Kilohertz Gravitational Waves from Binary Neutron Star Mergers:
Inference of Postmerger Signals with the Einstein Telescope | Paper 1: arXiv:2205.09112 | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Next-generation detectors are expected to be sensitive to postmerger signals
from binary neutron star coalescences and thus to directly probe the remnant
dynamics. We investigate the scientific potential of postmerger detections with
the Einstein Telescope using full Bayesian analyses with the state-of-the-art
wavefo... | [
{
"created": "Fri, 20 May 2022 06:18:55 GMT",
"version": "v1"
}
] | 2022-05-23 | [
[
"Breschi",
"Matteo",
""
],
[
"Gamba",
"Rossella",
""
],
[
"Borhanian",
"Ssohrab",
""
],
[
"Carullo",
"Gregorio",
""
],
[
"Bernuzzi",
"Sebastiano",
""
]
] | Next-generation detectors are expected to be sensitive to postmerger signals from binary neutron star coalescences and thus to directly probe the remnant dynamics. We investigate the scientific potential of postmerger detections with the Einstein Telescope using full Bayesian analyses with the state-of-the-art waveform... |
gr-qc/0003096 | Saulo Carneiro | Saulo Carneiro | Open cosmologies with rotation | Final version, accepted for publication in General Relativity and
Gravitation | Gen.Rel.Grav. 34 (2002) 793 | 10.1023/a:1016309613095 | null | gr-qc astro-ph hep-th | null | We study a rotating and expanding, Godel type metric, originally considered
by Korotkii and Obukhov, showing that, in the limit of large times and nearby
distances, it reduces to the open metric of Friedmann. In the epochs when
radiation or dust matter dominate the energy density, our solutions are similar
to the iso... | [
{
"created": "Fri, 24 Mar 2000 18:05:23 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jun 2000 13:16:42 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Aug 2000 18:15:15 GMT",
"version": "v3"
},
{
"created": "Tue, 22 Jan 2002 19:08:25 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Carneiro",
"Saulo",
""
]
] | We study a rotating and expanding, Godel type metric, originally considered by Korotkii and Obukhov, showing that, in the limit of large times and nearby distances, it reduces to the open metric of Friedmann. In the epochs when radiation or dust matter dominate the energy density, our solutions are similar to the isotr... |
1907.04625 | Pedro Moraes | P.H.R.S. Moraes | The trace of the trace of the energy-momentum tensor-dependent
Einstein's field equations | 5 pages | null | 10.1140/epjc/s10052-019-7195-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The $f(R,T)$ gravity field equations depend generically on both the Ricci
scalar $R$ and trace of the energy-momentum tensor $T$. Within the assumption
of perfect fluids, the theory carries an arbitrariness regarding the choice of
the matter lagrangian density $\mathcal{L}$, not uniquely defined. Such an
arbitrarines... | [
{
"created": "Wed, 10 Jul 2019 11:26:33 GMT",
"version": "v1"
}
] | 2019-09-04 | [
[
"Moraes",
"P. H. R. S.",
""
]
] | The $f(R,T)$ gravity field equations depend generically on both the Ricci scalar $R$ and trace of the energy-momentum tensor $T$. Within the assumption of perfect fluids, the theory carries an arbitrariness regarding the choice of the matter lagrangian density $\mathcal{L}$, not uniquely defined. Such an arbitrariness ... |
1302.7150 | Vincenzo Vitagliano | Vincenzo Vitagliano, Valerio Faraoni, Thomas P. Sotiriou, Stefano
Liberati | Apparent horizons in Clifton-Mota-Barrow inhomogeneous universe | 3 pages, 2 figures, contribution to the Proceedings of the 13th
Marcel Grossman Meeting (Stockholm, Sweden, July 1-7 2012) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the apparent horizon dynamics in the inhomogeneous
Clifton-Mota-Barrow solution of Brans-Dicke theory. This solution models a
central matter configuration embedded in a cosmological background. In certain
regions of the parameter space we find solutions exhibiting dynamical creation
or merging of two horiz... | [
{
"created": "Thu, 28 Feb 2013 11:03:59 GMT",
"version": "v1"
}
] | 2013-03-01 | [
[
"Vitagliano",
"Vincenzo",
""
],
[
"Faraoni",
"Valerio",
""
],
[
"Sotiriou",
"Thomas P.",
""
],
[
"Liberati",
"Stefano",
""
]
] | We analyze the apparent horizon dynamics in the inhomogeneous Clifton-Mota-Barrow solution of Brans-Dicke theory. This solution models a central matter configuration embedded in a cosmological background. In certain regions of the parameter space we find solutions exhibiting dynamical creation or merging of two horizon... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.