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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2401.01705 | Tanmoy Paul | Hitender Kumar, Tanmoy Paul, Soumitra SenGupta | f(R) gravity with spacetime torsion | EPL Accepted | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The duality between a higher curvature $f(R)$ gravity model and a
scalar-tensor theory helps to bring out the role of the additional degree of
freedom originating from the higher derivative terms in the gravity action.
Such a degree of freedom which appears as a scalar field has been shown to have
multiple implicatio... | [
{
"created": "Wed, 3 Jan 2024 12:15:35 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Jun 2024 06:39:01 GMT",
"version": "v2"
}
] | 2024-06-21 | [
[
"Kumar",
"Hitender",
""
],
[
"Paul",
"Tanmoy",
""
],
[
"SenGupta",
"Soumitra",
""
]
] | The duality between a higher curvature $f(R)$ gravity model and a scalar-tensor theory helps to bring out the role of the additional degree of freedom originating from the higher derivative terms in the gravity action. Such a degree of freedom which appears as a scalar field has been shown to have multiple implications... |
gr-qc/0407071 | Gaetano Lambiase | G. Lambiase, A.R. Prasanna | Gauge Invariant Wave Equations in Curved Space-Times and Primordial
Magnetic Fields | 5 pages, no figures, 1 table | Phys.Rev. D70 (2004) 063502 | 10.1103/PhysRevD.70.063502 | null | gr-qc | null | The inflationary production of magnetic field seeds for galaxies is
discussed. The analysis is carried out by writing the wave equation of the
electromagnetic field in curved spacetimes. The conformal invariance is broken
by taking into account of the interaction of the electromagnetic field with the
curvature tensor... | [
{
"created": "Mon, 19 Jul 2004 11:16:55 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Lambiase",
"G.",
""
],
[
"Prasanna",
"A. R.",
""
]
] | The inflationary production of magnetic field seeds for galaxies is discussed. The analysis is carried out by writing the wave equation of the electromagnetic field in curved spacetimes. The conformal invariance is broken by taking into account of the interaction of the electromagnetic field with the curvature tensor o... |
0712.3838 | Peter Collas | David Klein and Peter Collas | General Transformation Formulas for Fermi-Walker Coordinates | 23 pages. Corrected typos in the last two equations. Accepted for
publication in Classical and Quantum Gravity | Class.Quant.Grav.25:145019,2008 | 10.1088/0264-9381/25/14/145019 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We calculate the transformation and inverse transformation, in the form of
Taylor expansions, from arbitrary coordinates to Fermi-Walker coordinates in
tubular neighborhoods of arbitrary timelike paths for general spacetimes.
Explicit formulas for coefficients and the Jacobian matrix are given.
| [
{
"created": "Sat, 22 Dec 2007 08:18:36 GMT",
"version": "v1"
},
{
"created": "Mon, 3 Mar 2008 05:10:23 GMT",
"version": "v2"
},
{
"created": "Sat, 31 May 2008 23:35:56 GMT",
"version": "v3"
},
{
"created": "Fri, 27 Jun 2008 07:40:55 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Klein",
"David",
""
],
[
"Collas",
"Peter",
""
]
] | We calculate the transformation and inverse transformation, in the form of Taylor expansions, from arbitrary coordinates to Fermi-Walker coordinates in tubular neighborhoods of arbitrary timelike paths for general spacetimes. Explicit formulas for coefficients and the Jacobian matrix are given. |
2007.12552 | Ra\"ul Vera | Marc Mars, Borja Reina, Ra\"ul Vera | Existence and uniqueness of compact rotating configurations in GR in
second order perturbation theory | 81 pages, no figures | null | 10.4310/ATMP.2022.v26.n8.a9 | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Existence and uniqueness of rotating fluid bodies in equilibrium is still
poorly understood in General Relativity (GR). Apart from the limiting case of
infinitely thin disks, the only known global results in the stationary rotating
case (Heilig [14] and Makino [21] [arXiv:1705.07392]) show existence in GR
nearby a Ne... | [
{
"created": "Fri, 24 Jul 2020 15:00:52 GMT",
"version": "v1"
}
] | 2024-01-26 | [
[
"Mars",
"Marc",
""
],
[
"Reina",
"Borja",
""
],
[
"Vera",
"Raül",
""
]
] | Existence and uniqueness of rotating fluid bodies in equilibrium is still poorly understood in General Relativity (GR). Apart from the limiting case of infinitely thin disks, the only known global results in the stationary rotating case (Heilig [14] and Makino [21] [arXiv:1705.07392]) show existence in GR nearby a Newt... |
1806.11110 | Papantonopoulos Eleftherios | Theodoros Kolyvaris, Marina Koukouvaou, Antri Machattou, Eleftherios
Papantonopoulos | Superradiant Instabilities in a Class of Scalar-Tensor Horndeski Theory | 8 Figures, 21 Pages, accepted for publication to Physical Review D.
arXiv admin note: substantial text overlap with arXiv:1702.04618; text
overlap with arXiv:1304.6474 by other authors | null | 10.1103/PhysRevD.98.024045 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We study the superradiance effect in a class of scalar-tensor Horndeski
theory. We first study the dynamics of a massive charged scalar wave scattered
off the horizon of a Reissner-Nordstr\"om black hole which except its canonical
coupling to gravity it is also coupled kinetically to curvature. We find that a
trappin... | [
{
"created": "Thu, 28 Jun 2018 15:25:40 GMT",
"version": "v1"
}
] | 2018-08-15 | [
[
"Kolyvaris",
"Theodoros",
""
],
[
"Koukouvaou",
"Marina",
""
],
[
"Machattou",
"Antri",
""
],
[
"Papantonopoulos",
"Eleftherios",
""
]
] | We study the superradiance effect in a class of scalar-tensor Horndeski theory. We first study the dynamics of a massive charged scalar wave scattered off the horizon of a Reissner-Nordstr\"om black hole which except its canonical coupling to gravity it is also coupled kinetically to curvature. We find that a trapping ... |
1506.03278 | Olivier Minazzoli | Hendrik Ludwig, Olivier Minazzoli, Salvatore Capozziello | Merging matter and geometry in the same Lagrangian | null | Physics Letters B, Volume 751, 17 December 2015, Pages 576-578 | 10.1016/j.physletb.2015.11.023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a Lagrangian density proportional to $\sqrt{-g} \L_m^2/R$
reduces to a pressuron theory of gravity that is indistinguishable from General
Relativity in the dust limit. The combination of matter and geometry in the
same Lagrangian density intrinsically satisfies Mach's Principle --- since
matter cannot ex... | [
{
"created": "Wed, 10 Jun 2015 12:36:11 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Oct 2015 15:27:27 GMT",
"version": "v2"
}
] | 2015-11-24 | [
[
"Ludwig",
"Hendrik",
""
],
[
"Minazzoli",
"Olivier",
""
],
[
"Capozziello",
"Salvatore",
""
]
] | We show that a Lagrangian density proportional to $\sqrt{-g} \L_m^2/R$ reduces to a pressuron theory of gravity that is indistinguishable from General Relativity in the dust limit. The combination of matter and geometry in the same Lagrangian density intrinsically satisfies Mach's Principle --- since matter cannot exis... |
2204.11293 | Francois Larrouturou | Luc Blanchet and Guillaume Faye and Fran\c{c}ois Larrouturou | The Quadrupole Moment of Compact Binaries to the Fourth post-Newtonian
Order: From Source to Canonical Moment | 25 pages, no figure | CQG 39(2022)195003 | 10.1088/1361-6382/ac840c | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | As a crucial step towards the completion of the fourth post-Newtonian (4PN)
gravitational-wave generation from compact binary systems, we obtain the
expressions of the so-called "canonical" multipole moments of the source in
terms of the "source" and "gauge" moments. The canonical moments describe the
propagation of ... | [
{
"created": "Sun, 24 Apr 2022 14:51:20 GMT",
"version": "v1"
},
{
"created": "Tue, 3 May 2022 20:26:53 GMT",
"version": "v2"
},
{
"created": "Tue, 16 Aug 2022 08:22:03 GMT",
"version": "v3"
},
{
"created": "Fri, 2 Sep 2022 17:40:06 GMT",
"version": "v4"
}
] | 2022-09-14 | [
[
"Blanchet",
"Luc",
""
],
[
"Faye",
"Guillaume",
""
],
[
"Larrouturou",
"François",
""
]
] | As a crucial step towards the completion of the fourth post-Newtonian (4PN) gravitational-wave generation from compact binary systems, we obtain the expressions of the so-called "canonical" multipole moments of the source in terms of the "source" and "gauge" moments. The canonical moments describe the propagation of gr... |
1211.3725 | Cristian Stelea | Cristian Stelea, Marian C. Ghilea | A black ring on the Taub-bolt instanton in five dimensions | 14 pages, 1 figure, added references. arXiv admin note: text overlap
with arXiv:1211.3154 | null | 10.1016/j.physletb.2013.01.009 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a solution generating technique, we derive a new exact solution
describing a charged static black ring on the Taub-bolt gravitational instanton
in five dimensions. Unlike the black ring constructed on the self-dual Taub-NUT
instanton, it turns out that it is possible to find values of the parameters
for which t... | [
{
"created": "Thu, 15 Nov 2012 20:37:55 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Nov 2012 20:00:30 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Stelea",
"Cristian",
""
],
[
"Ghilea",
"Marian C.",
""
]
] | Using a solution generating technique, we derive a new exact solution describing a charged static black ring on the Taub-bolt gravitational instanton in five dimensions. Unlike the black ring constructed on the self-dual Taub-NUT instanton, it turns out that it is possible to find values of the parameters for which the... |
gr-qc/9511031 | Luis Anchordoqui | G. E. Romero, J. A. Combi, S. E. Perez Bergliaffa, L. A. Anchordoqui | Centaurus A as a source of extragalactic cosmic rays with arrival
energies well beyond the GZK cutoff | Some remarks by the referee added, to appear in Astroparticle Physics | Astropart.Phys.5:279-283,1996 | 10.1016/0927-6505(96)00029-1 | null | gr-qc | null | The ultra--high energy cosmic rays recently detected by several air shower
experiments could have an extragalactic origin. In this case, the nearest
active galaxy Centaurus A might be the source of the most energetic particles
ever detected on Earth. We have used recent radio observations in order to
estimate the arr... | [
{
"created": "Fri, 10 Nov 1995 00:24:07 GMT",
"version": "v1"
},
{
"created": "Thu, 1 Aug 1996 22:09:03 GMT",
"version": "v2"
}
] | 2011-05-23 | [
[
"Romero",
"G. E.",
""
],
[
"Combi",
"J. A.",
""
],
[
"Bergliaffa",
"S. E. Perez",
""
],
[
"Anchordoqui",
"L. A.",
""
]
] | The ultra--high energy cosmic rays recently detected by several air shower experiments could have an extragalactic origin. In this case, the nearest active galaxy Centaurus A might be the source of the most energetic particles ever detected on Earth. We have used recent radio observations in order to estimate the arriv... |
gr-qc/0204051 | Giovanni Amelino-Camelia | Giovanni Amelino-Camelia | Quantum-Gravity Phenomenology: Status and Prospects | 28 pages, LaTex, invited Brief Review to appear in a a special issue
of Modern Physics Letters A devoted to the First IUCAA Meeting on the
Interface of Gravitational and Quantum Realms | Mod.Phys.Lett. A17 (2002) 899-922 | 10.1142/S0217732302007612 | null | gr-qc | null | Over the last few years part of the quantum-gravity community has adopted a
more optimistic attitude toward the possibility of finding experimental
contexts providing insight on non-classical properties of spacetime. I review
those quantum-gravity phenomenology proposals which were instrumental in
bringing about this... | [
{
"created": "Mon, 15 Apr 2002 21:20:27 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Amelino-Camelia",
"Giovanni",
""
]
] | Over the last few years part of the quantum-gravity community has adopted a more optimistic attitude toward the possibility of finding experimental contexts providing insight on non-classical properties of spacetime. I review those quantum-gravity phenomenology proposals which were instrumental in bringing about this c... |
1209.4892 | James Ryan | Bianca Dittrich and James P. Ryan | On the role of the Barbero-Immirzi parameter in discrete quantum gravity | 16 + 12 pages | null | 10.1088/0264-9381/30/9/095015 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The 1-parameter family of transformations identified by Barbero and Immirzi
plays a significant role in non-perturbative approaches to quantum gravity,
among them Loop Quantum Gravity and Spin Foams. It facilitates the loop
quantization programme and subsequently the Barbero-Immirzi parameter (gamma)
arises in both t... | [
{
"created": "Fri, 21 Sep 2012 19:50:31 GMT",
"version": "v1"
}
] | 2015-06-11 | [
[
"Dittrich",
"Bianca",
""
],
[
"Ryan",
"James P.",
""
]
] | The 1-parameter family of transformations identified by Barbero and Immirzi plays a significant role in non-perturbative approaches to quantum gravity, among them Loop Quantum Gravity and Spin Foams. It facilitates the loop quantization programme and subsequently the Barbero-Immirzi parameter (gamma) arises in both the... |
1707.09205 | Georgios Papadopoulos O | Georgios O. Papadopoulos | Finding integrals and identities in the Newman Penrose formalism: a
comment on Class. Quantum Grav. 26 (2009) 105022 and on Gen. Relativ. Gravit.
(2014)46:1703 | 7 pages, no figures, submitted to a journal | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In 1969 Kinnersley, using the NP formalism, found all the Petrov type D,
Ricci flat, solutions to the Einstein's Field Equations. Yet, in doing so -as
it seems- he neglected two fundamental identities (or constraints) on four NP
variables and Cartan invariants as well, namely $\tau\bar{\tau}-\pi\bar{\pi}=0$
and $\rho... | [
{
"created": "Fri, 28 Jul 2017 12:25:42 GMT",
"version": "v1"
}
] | 2017-07-31 | [
[
"Papadopoulos",
"Georgios O.",
""
]
] | In 1969 Kinnersley, using the NP formalism, found all the Petrov type D, Ricci flat, solutions to the Einstein's Field Equations. Yet, in doing so -as it seems- he neglected two fundamental identities (or constraints) on four NP variables and Cartan invariants as well, namely $\tau\bar{\tau}-\pi\bar{\pi}=0$ and $\rho\b... |
2211.01243 | Uwe R. Fischer | Caio C. Holanda Ribeiro, Uwe R. Fischer | Impact of trans-Planckian excitations on black-hole radiation in dipolar
condensates | 6+4 pages, 2 figures | Phys. Rev. D 107, L121502 (2023) | 10.1103/PhysRevD.107.L121502 | null | gr-qc cond-mat.quant-gas quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider a quasi-one-dimensional dipolar condensate in an analogue black
hole setup. It is shown that the existence of a roton minimum in the condensate
dispersion relation leaves deep imprints onto the Hawking radiation spectrum.
In particular, the emitted radiation can be either more intense or suppressed,
depen... | [
{
"created": "Wed, 2 Nov 2022 16:25:22 GMT",
"version": "v1"
}
] | 2024-01-29 | [
[
"Ribeiro",
"Caio C. Holanda",
""
],
[
"Fischer",
"Uwe R.",
""
]
] | We consider a quasi-one-dimensional dipolar condensate in an analogue black hole setup. It is shown that the existence of a roton minimum in the condensate dispersion relation leaves deep imprints onto the Hawking radiation spectrum. In particular, the emitted radiation can be either more intense or suppressed, dependi... |
1901.07541 | Jose Rafael Arce-Gamboa | J. R. Arce-Gamboa and F. Frutos-Alfaro | Classical General Relativity Effects to Second Order in Mass, Spin, and
Quadrupole Moment | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this contribution, we calculate the light deflection, perihelium shift,
time delay and gravitational redshift using an approximate metric that contains
the Kerr metric and an approximaction of the Erez-Rosen spacetime. The results
were obtained directly using Mathematica. The results agree with the ones
presented ... | [
{
"created": "Mon, 21 Jan 2019 22:11:30 GMT",
"version": "v1"
},
{
"created": "Sat, 9 Feb 2019 17:15:58 GMT",
"version": "v2"
},
{
"created": "Sun, 7 Apr 2019 23:39:18 GMT",
"version": "v3"
},
{
"created": "Thu, 8 Aug 2019 03:04:20 GMT",
"version": "v4"
}
] | 2019-08-09 | [
[
"Arce-Gamboa",
"J. R.",
""
],
[
"Frutos-Alfaro",
"F.",
""
]
] | In this contribution, we calculate the light deflection, perihelium shift, time delay and gravitational redshift using an approximate metric that contains the Kerr metric and an approximaction of the Erez-Rosen spacetime. The results were obtained directly using Mathematica. The results agree with the ones presented in... |
2303.00190 | Xjao-Jun Gao | Xiao-Jun Gao, Xiao-kun Yan, Yihao Yin and Ya-Peng Hu | Gravitational lensing by a charged spherically symmetric black hole
immersed in thin dark matter | 14 pages, 3 figures; v2: adding some references | Eur. Phys. J. C (2023) 83:281 | 10.1140/epjc/s10052-023-11414-0 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the gravitational lensing effect around a spherically
symmetric black hole, whose metric is obtained from the Einstein field equation
with electric charge and perfect-fluid dark matter contributing to its
energy-momentum tensor. We do the calculation analytically in the weak field
limit and we assume t... | [
{
"created": "Wed, 1 Mar 2023 02:39:50 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Apr 2023 06:27:41 GMT",
"version": "v2"
}
] | 2023-04-13 | [
[
"Gao",
"Xiao-Jun",
""
],
[
"Yan",
"Xiao-kun",
""
],
[
"Yin",
"Yihao",
""
],
[
"Hu",
"Ya-Peng",
""
]
] | We investigate the gravitational lensing effect around a spherically symmetric black hole, whose metric is obtained from the Einstein field equation with electric charge and perfect-fluid dark matter contributing to its energy-momentum tensor. We do the calculation analytically in the weak field limit and we assume tha... |
gr-qc/0306101 | Gagab Gad | Ragab M. Gad (Minia University) | Energy Distribution of a Stringy Charged Black Hole | Latex, no figures | Astrophys.Space Sci. 295 (2005) 459-462 | 10.1007/s10509-005-1195-6 | null | gr-qc | null | The energy distribution associated with a stringy charged black hole is
studied using M{\o}ller's energy-momentum complex. Our result is reasonable and
it differs from that known in literature using Einstein's energy-momentum
complex.
| [
{
"created": "Sun, 22 Jun 2003 15:26:34 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Gad",
"Ragab M.",
"",
"Minia University"
]
] | The energy distribution associated with a stringy charged black hole is studied using M{\o}ller's energy-momentum complex. Our result is reasonable and it differs from that known in literature using Einstein's energy-momentum complex. |
2004.11542 | Cosimo Bambi | Honghui Liu, Haiyang Wang, Askar B. Abdikamalov, Dimitry Ayzenberg,
Cosimo Bambi | Reflection features in the X-ray spectrum of Fairall 9 and implications
for tests of general relativity | 10 pages, 7 figures | Astrophys.J. 896: 160 (2020) | 10.3847/1538-4357/ab917a | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | X-ray reflection spectroscopy is potentially a powerful tool to probe the
spacetime geometry around astrophysical black holes and test general relativity
in the strong field regime. However, precision tests of general relativity are
only possible if we employ the correct astrophysical model and we can limit the
syste... | [
{
"created": "Fri, 24 Apr 2020 05:50:43 GMT",
"version": "v1"
}
] | 2020-06-25 | [
[
"Liu",
"Honghui",
""
],
[
"Wang",
"Haiyang",
""
],
[
"Abdikamalov",
"Askar B.",
""
],
[
"Ayzenberg",
"Dimitry",
""
],
[
"Bambi",
"Cosimo",
""
]
] | X-ray reflection spectroscopy is potentially a powerful tool to probe the spacetime geometry around astrophysical black holes and test general relativity in the strong field regime. However, precision tests of general relativity are only possible if we employ the correct astrophysical model and we can limit the systema... |
1912.06222 | Reinoud Slagter | Reinoud J. Slagter and Jebin Larosh | On the BTZ Black Hole and the Spinning Cosmic String | version--V3: the 3D exact solution is added-- comments welcome-- 8
pages-- 6 figures | null | 10.1007/s12036-020-09645-8 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We reviewed the Ba\u nados-Teitelboim-Zanelli (BTZ) black hole solution in
connection with the spinning string solution. We find a new exact solution,
which can be related to the $(2+1)$-dimensional spinning point particle
solution. There is no need for a cosmological constant, so the solution can be
up-lifted to $(3... | [
{
"created": "Thu, 12 Dec 2019 21:25:46 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Dec 2019 11:01:00 GMT",
"version": "v2"
},
{
"created": "Wed, 18 Dec 2019 12:07:11 GMT",
"version": "v3"
}
] | 2020-11-18 | [
[
"Slagter",
"Reinoud J.",
""
],
[
"Larosh",
"Jebin",
""
]
] | We reviewed the Ba\u nados-Teitelboim-Zanelli (BTZ) black hole solution in connection with the spinning string solution. We find a new exact solution, which can be related to the $(2+1)$-dimensional spinning point particle solution. There is no need for a cosmological constant, so the solution can be up-lifted to $(3+1... |
1910.05631 | Rocco D'Agostino | Alexander Bonilla, Rocco D'Agostino, Rafael C. Nunes, Jos\'e C. N. de
Araujo | Forecasts on the speed of gravitational waves at high $z$ | 22 pages, 15 figures | JCAP 03 (2020) 015 | 10.1088/1475-7516/2020/03/015 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The observation of GW170817 binary neutron star (BNS) merger event has
imposed strong bounds on the speed of gravitational waves (GWs) locally,
inferring that the speed of GWs propagation is equal to the speed of light.
Current GW detectors in operation will not be able to observe BNS merger to
long cosmological dist... | [
{
"created": "Sat, 12 Oct 2019 19:10:59 GMT",
"version": "v1"
},
{
"created": "Sat, 7 Mar 2020 19:21:20 GMT",
"version": "v2"
}
] | 2020-03-10 | [
[
"Bonilla",
"Alexander",
""
],
[
"D'Agostino",
"Rocco",
""
],
[
"Nunes",
"Rafael C.",
""
],
[
"de Araujo",
"José C. N.",
""
]
] | The observation of GW170817 binary neutron star (BNS) merger event has imposed strong bounds on the speed of gravitational waves (GWs) locally, inferring that the speed of GWs propagation is equal to the speed of light. Current GW detectors in operation will not be able to observe BNS merger to long cosmological distan... |
1506.01184 | Peter Hess O | Gunther Caspar and Isaac Rodriguez and Peter O. Hess and Walter
Greiner | Vacuum fluctuation inside a star and their consequences for neutron
stars, a simple model | 19 pages, 5 figures | null | 10.1142/S0218301316500270 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Applying semi-classical Quantum Mechanics, the vacuum fluctuations within a
star are determined, assuming a constant mass density and applying a monopole
approximation. It is found that the density for the vacuum fluctuations does
not only depend linearly on the mass density, as assumed in a former
publication, where... | [
{
"created": "Wed, 3 Jun 2015 09:51:07 GMT",
"version": "v1"
}
] | 2016-05-25 | [
[
"Caspar",
"Gunther",
""
],
[
"Rodriguez",
"Isaac",
""
],
[
"Hess",
"Peter O.",
""
],
[
"Greiner",
"Walter",
""
]
] | Applying semi-classical Quantum Mechanics, the vacuum fluctuations within a star are determined, assuming a constant mass density and applying a monopole approximation. It is found that the density for the vacuum fluctuations does not only depend linearly on the mass density, as assumed in a former publication, where n... |
2402.17422 | Dar\'io Jaramillo Garrido | Dar\'io Jaramillo-Garrido, Antonio L. Maroto, and Prado
Mart\'in-Moruno | Symmetry restoration for TDiff scalar fields | V2: 24 pages, new section V, new appendix, new applications,
conclusions unchanged, version accepted for publication in PRD. V1: 9 pages,
1 Appendix | null | null | IPARCOS-UCM-24-013 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the idea of restoring the full diffeomorphism (Diff) invariance in
theories with only transverse diffeomorphisms (TDiff) by the introduction of
additional fields. In particular, we consider in detail the case of a TDiff
invariant scalar field and how Diff symmetry can be restored preserving
locality by int... | [
{
"created": "Tue, 27 Feb 2024 11:31:40 GMT",
"version": "v1"
},
{
"created": "Thu, 27 Jun 2024 14:08:37 GMT",
"version": "v2"
}
] | 2024-06-28 | [
[
"Jaramillo-Garrido",
"Darío",
""
],
[
"Maroto",
"Antonio L.",
""
],
[
"Martín-Moruno",
"Prado",
""
]
] | We explore the idea of restoring the full diffeomorphism (Diff) invariance in theories with only transverse diffeomorphisms (TDiff) by the introduction of additional fields. In particular, we consider in detail the case of a TDiff invariant scalar field and how Diff symmetry can be restored preserving locality by intro... |
1102.4067 | Mikhail Gorbatenko | M. V. Gorbatenko, V. P. Neznamov | Uniqueness and Self-Conjugacy of Dirac Hamiltonians in arbitrary
Gravitational Fields | 23 pages | Phys.Rev.D83:105002,2011 | 10.1103/PhysRevD.83.105002 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Proofs of two statements are provided in this paper. First, the authors prove
that the formalism of the pseudo-Hermitian quantum mechanics allows describing
the Dirac particles motion in arbitrary stationary gravitational fields.
Second, it is proved that using the Parker weight operator and the subsequent
transition... | [
{
"created": "Sun, 20 Feb 2011 13:30:27 GMT",
"version": "v1"
}
] | 2011-05-12 | [
[
"Gorbatenko",
"M. V.",
""
],
[
"Neznamov",
"V. P.",
""
]
] | Proofs of two statements are provided in this paper. First, the authors prove that the formalism of the pseudo-Hermitian quantum mechanics allows describing the Dirac particles motion in arbitrary stationary gravitational fields. Second, it is proved that using the Parker weight operator and the subsequent transition t... |
gr-qc/9511082 | null | Nivaldo A. Lemos (Center for Theoretical Physics, MIT) | Radiation-Dominated Quantum Friedmann Models | 18 pages, LaTex, to appear in J. Math. Phys | J.Math.Phys. 37 (1996) 1449-1460 | 10.1063/1.531443 | MIT-CTP-2493 | gr-qc | null | Radiation-filled Friedmann-Robertson-Walker universes are quantized according
to the Arnowitt-Deser-Misner formalism in the conformal-time gauge. Unlike
previous treatments of this problem, here both closed and open models are
studied, only square-integrable wave functions are allowed, and the boundary
conditions to ... | [
{
"created": "Thu, 30 Nov 1995 18:10:35 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Lemos",
"Nivaldo A.",
"",
"Center for Theoretical Physics, MIT"
]
] | Radiation-filled Friedmann-Robertson-Walker universes are quantized according to the Arnowitt-Deser-Misner formalism in the conformal-time gauge. Unlike previous treatments of this problem, here both closed and open models are studied, only square-integrable wave functions are allowed, and the boundary conditions to en... |
2408.02538 | Masroor C. Pookkillath | Masroor C. Pookkillath, Nandan Roy | $G_{3}$ -- interacting scalar tensor dark energy | 22 pages, 6 figures, revtex | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the effect of adding an interaction in the $G_3$ term of Horndeski
theory, where the propagation of gravitational waves are not modified. We
derive the background and perturbation equations of motion from the action. We
also derive the no-ghost and Laplacian instability conditions for tensor modes
and scalar... | [
{
"created": "Mon, 5 Aug 2024 15:11:09 GMT",
"version": "v1"
}
] | 2024-08-06 | [
[
"Pookkillath",
"Masroor C.",
""
],
[
"Roy",
"Nandan",
""
]
] | We study the effect of adding an interaction in the $G_3$ term of Horndeski theory, where the propagation of gravitational waves are not modified. We derive the background and perturbation equations of motion from the action. We also derive the no-ghost and Laplacian instability conditions for tensor modes and scalar m... |
1902.02585 | Iber\^e Kuntz | Iber\^e Kuntz | Non-smooth gravity and parity violation | null | null | 10.1007/s10701-019-00240-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A conservative extension of general relativity is proposed by alleviating the
differentiability of the metric and allowing for non-smooth solutions. We show
that these metrics break some symmetries of the Riemann tensor, yielding a new
scalar curvature invariant besides the usual Ricci scalar. To first order in
the c... | [
{
"created": "Thu, 7 Feb 2019 12:31:01 GMT",
"version": "v1"
}
] | 2019-03-27 | [
[
"Kuntz",
"Iberê",
""
]
] | A conservative extension of general relativity is proposed by alleviating the differentiability of the metric and allowing for non-smooth solutions. We show that these metrics break some symmetries of the Riemann tensor, yielding a new scalar curvature invariant besides the usual Ricci scalar. To first order in the cur... |
gr-qc/9212006 | Sean Hayward | Sean A. Hayward | On Cosmological Isotropy, Quantum Cosmology and the Weyl Curvature
Hypothesis | 5 pages | Class.Quant.Grav.10:L7-L11,1993 | 10.1088/0264-9381/10/1/002 | null | gr-qc | null | The increasing entropy, large-scale isotropy and approximate flatness of the
universe are considered in the context of signature change, which is a
classical model of quantum tunnelling in quantum cosmology. The signature
change hypothesis implies an initial inflationary epoch, the magnetic half of
the Weyl curvature... | [
{
"created": "Thu, 10 Dec 1992 10:21:52 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Hayward",
"Sean A.",
""
]
] | The increasing entropy, large-scale isotropy and approximate flatness of the universe are considered in the context of signature change, which is a classical model of quantum tunnelling in quantum cosmology. The signature change hypothesis implies an initial inflationary epoch, the magnetic half of the Weyl curvature h... |
gr-qc/0410028 | Eric Black | Eric D. Black, Akira Villar, and Kenneth G. Libbrecht | Thermoelastic-damping noise from sapphire mirrors in a
fundamental-noise-limited interferometer | 4 pages, 2 figures | Phys.Rev.Lett. 93 (2004) 241101 | 10.1103/PhysRevLett.93.241101 | null | gr-qc | null | We report the first high-precision interferometer using large sapphire
mirrors, and we present the first direct, broadband measurements of the
fundamental thermal noise in these mirrors. Our results agree well with the
thermoelastic-damping noise predictions of Braginsky, et al. [Phys. Lett. A
264, 1(1999)] and Cerdo... | [
{
"created": "Wed, 6 Oct 2004 22:09:57 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Black",
"Eric D.",
""
],
[
"Villar",
"Akira",
""
],
[
"Libbrecht",
"Kenneth G.",
""
]
] | We report the first high-precision interferometer using large sapphire mirrors, and we present the first direct, broadband measurements of the fundamental thermal noise in these mirrors. Our results agree well with the thermoelastic-damping noise predictions of Braginsky, et al. [Phys. Lett. A 264, 1(1999)] and Cerdoni... |
gr-qc/9409062 | T. P. Singh | T. P. Singh and P. S. Joshi | The Final Fate of Spherical Inhomogeneous Dust Collapse | 23 pages; Plain Tex; TIFR-TAP preprint | Class.Quant.Grav. 13 (1996) 559-572 | 10.1088/0264-9381/13/3/019 | null | gr-qc astro-ph hep-th | null | We examine the role of the initial density and velocity distribution in the
gravitational collapse of a spherical inhomogeneous dust cloud. Such a collapse
is described by the Tolman-Bondi metric which has two free functions: the
`mass-function' and the `energy function', which are determined by the initial
density a... | [
{
"created": "Fri, 30 Sep 1994 10:00:00 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Singh",
"T. P.",
""
],
[
"Joshi",
"P. S.",
""
]
] | We examine the role of the initial density and velocity distribution in the gravitational collapse of a spherical inhomogeneous dust cloud. Such a collapse is described by the Tolman-Bondi metric which has two free functions: the `mass-function' and the `energy function', which are determined by the initial density and... |
1201.5999 | Chris Pankow | the LIGO Scientific Collaboration, the Virgo Collaboration: J. Abadie,
B. P. Abbott, R. Abbott, T. D. Abbott, M. Abernathy, T. Accadia, F. Acernese,
C. Adams, R. Adhikari, C. Affeldt, M. Agathos, K. Agatsuma, P. Ajith, B.
Allen, E. Amador Ceron, D. Amariutei, S. B. Anderson, W. G. Anderson, K.
Arai, M. A. Arain... | Search for Gravitational Waves from Intermediate Mass Binary Black Holes | 13 pages, 4 figures: data for plots and archived public version at
https://dcc.ligo.org/cgi-bin/DocDB/ShowDocument?docid=62326, see also the
public announcement at http://www.ligo.org/science/Publication-S5IMBH/ | null | 10.1103/PhysRevD.85.102004 | P1100068 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present the results of a weakly modeled burst search for gravitational
waves from mergers of non-spinning intermediate mass black holes (IMBH) in the
total mass range 100--450 solar masses and with the component mass ratios
between 1:1 and 4:1. The search was conducted on data collected by the LIGO and
Virgo detec... | [
{
"created": "Sat, 28 Jan 2012 22:41:14 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2012 00:43:18 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Apr 2012 20:08:50 GMT",
"version": "v3"
}
] | 2013-05-30 | [
[
"the LIGO Scientific Collaboration",
"",
""
],
[
"the Virgo Collaboration",
"",
""
],
[
"Abadie",
"J.",
""
],
[
"Abbott",
"B. P.",
""
],
[
"Abbott",
"R.",
""
],
[
"Abbott",
"T. D.",
""
],
[
"Abernathy",
"M.",
... | We present the results of a weakly modeled burst search for gravitational waves from mergers of non-spinning intermediate mass black holes (IMBH) in the total mass range 100--450 solar masses and with the component mass ratios between 1:1 and 4:1. The search was conducted on data collected by the LIGO and Virgo detecto... |
1502.01003 | Daniel Guariento | Alan M. da Silva, Daniel C. Guariento, C. Molina | Cosmological black holes and white holes with time-dependent mass | 12 pages, 5 figures | Phys. Rev. D 91, 084043 (2015) | 10.1103/PhysRevD.91.084043 | null | gr-qc astro-ph.CO hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the causal structure of generalized uncharged McVittie spacetimes
with increasing central mass $m (t)$ and positive Hubble factor $H (t)$. Under
physically reasonable conditions, namely, a big bang singularity in the past, a
positive cosmological constant and an upper limit to the central mass, we prove
t... | [
{
"created": "Tue, 3 Feb 2015 20:39:53 GMT",
"version": "v1"
}
] | 2015-04-29 | [
[
"da Silva",
"Alan M.",
""
],
[
"Guariento",
"Daniel C.",
""
],
[
"Molina",
"C.",
""
]
] | We consider the causal structure of generalized uncharged McVittie spacetimes with increasing central mass $m (t)$ and positive Hubble factor $H (t)$. Under physically reasonable conditions, namely, a big bang singularity in the past, a positive cosmological constant and an upper limit to the central mass, we prove tha... |
gr-qc/9303022 | Jason Twamley | J. Twamley | Inconsistency between alternative approaches to Quantum Decoherence in
special systems | 10 pages | null | null | null | gr-qc | null | We study the decoherence properties of a certain class of Markovian quantum
open systems from both the Decohering Histories and Environment Induced
Superselection paradigms. The class studied includes many familiar quantum
optical cases. For this class, we show that there always exists a basis which
leads to {\em exa... | [
{
"created": "Fri, 19 Mar 1993 19:54:48 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Twamley",
"J.",
""
]
] | We study the decoherence properties of a certain class of Markovian quantum open systems from both the Decohering Histories and Environment Induced Superselection paradigms. The class studied includes many familiar quantum optical cases. For this class, we show that there always exists a basis which leads to {\em exact... |
2312.10792 | Giorgio Mentasti | Giorgio Mentasti and Carlo R. Contaldi and Marco Peloso | Probing the galactic and extragalactic gravitational wave backgrounds
with space-based interferometers | null | null | null | null | gr-qc astro-ph.CO astro-ph.IM | http://creativecommons.org/licenses/by/4.0/ | We employ the formalism developed in \cite{Mentasti:2023gmg} and
\cite{Bartolo_2022} to study the prospect of detecting an anisotropic
Stochastic Gravitational Wave Background (SGWB) with the Laser Interferometer
Space Antenna (LISA) alone, and combined with the proposed space-based
interferometer Taiji. Previous ana... | [
{
"created": "Sun, 17 Dec 2023 18:40:48 GMT",
"version": "v1"
},
{
"created": "Sun, 11 Feb 2024 23:58:42 GMT",
"version": "v2"
}
] | 2024-02-13 | [
[
"Mentasti",
"Giorgio",
""
],
[
"Contaldi",
"Carlo R.",
""
],
[
"Peloso",
"Marco",
""
]
] | We employ the formalism developed in \cite{Mentasti:2023gmg} and \cite{Bartolo_2022} to study the prospect of detecting an anisotropic Stochastic Gravitational Wave Background (SGWB) with the Laser Interferometer Space Antenna (LISA) alone, and combined with the proposed space-based interferometer Taiji. Previous analy... |
0802.4374 | Sini R | Sini R, Nijo Varghese and V C Kuriakose | Absorption cross section of RN and SdS extremal black hole | 11 pages, Preprint to IJMPA | Int.J.Mod.Phys.A23:4011-4021,2008 | 10.1142/S0217751X0804158X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The nature of scalar wave functions near the horizon of Reissner Nordstrom
(RN) extremal and Schwarzschild-de Sitter (SdS) extremal black holes are found
using WKB approximation and the effect of reflection of waves from the horizon.
The absorption cross section $\sigma_{abs}$ when RN extremal and SdS extremal
black ... | [
{
"created": "Fri, 29 Feb 2008 12:17:39 GMT",
"version": "v1"
}
] | 2009-02-16 | [
[
"R",
"Sini",
""
],
[
"Varghese",
"Nijo",
""
],
[
"Kuriakose",
"V C",
""
]
] | The nature of scalar wave functions near the horizon of Reissner Nordstrom (RN) extremal and Schwarzschild-de Sitter (SdS) extremal black holes are found using WKB approximation and the effect of reflection of waves from the horizon. The absorption cross section $\sigma_{abs}$ when RN extremal and SdS extremal black ho... |
1602.03329 | Jibitesh Dutta | Jibitesh Dutta, Wompherdeiki Khyllep and Erickson Syiemlieh | Late time accelerated scaling attractors in DGP
(Dvali-Gabadadze-Porrati) braneworld | 18 pages, 28 figs. Comments wellcome | Eur. Phys. J. Plus (2016) 131: 33 | 10.1140/epjp/i2016-16033-7 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the evolution of late universe, the main source of matter are Dark energy
and Dark matter. They are indirectly detected only through their gravitational
manifestations. So the possibility of interaction with each other without
violating observational restrictions is not ruled out. With this motivation, we
investig... | [
{
"created": "Wed, 10 Feb 2016 11:07:22 GMT",
"version": "v1"
}
] | 2016-02-23 | [
[
"Dutta",
"Jibitesh",
""
],
[
"Khyllep",
"Wompherdeiki",
""
],
[
"Syiemlieh",
"Erickson",
""
]
] | In the evolution of late universe, the main source of matter are Dark energy and Dark matter. They are indirectly detected only through their gravitational manifestations. So the possibility of interaction with each other without violating observational restrictions is not ruled out. With this motivation, we investigat... |
0810.1978 | Simone Speziale | Simone Speziale | Background-free propagation in loop quantum gravity | Invited contribution to a special issue of Advanced Science Letters
edited by Martin Bojowald. 14 pages. v2 minor corrections | null | null | pi-qg-98 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | I review the definition of n-point functions in loop quantum gravity,
discussing what has been done and what are the main open issues. Particular
attention is dedicated to gauge aspects and renormalization.
| [
{
"created": "Fri, 10 Oct 2008 22:41:43 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Nov 2008 13:42:32 GMT",
"version": "v2"
}
] | 2008-11-20 | [
[
"Speziale",
"Simone",
""
]
] | I review the definition of n-point functions in loop quantum gravity, discussing what has been done and what are the main open issues. Particular attention is dedicated to gauge aspects and renormalization. |
2006.11575 | S. N Sajadi | S. H. Hendi, S. N. Sajadi, Maryam. Khademi | Physical Properties of a Regular Rotating Black Hole: Thermodynamics,
Stability, Quasinormal Modes | 19 pages, 14 figures | Phys. Rev. D 103, 064016 (2021) | 10.1103/PhysRevD.103.064016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Respecting the angular momentum conservation of torque-free systems, it is
natural to consider rotating solutions of massive objects. Besides that,
motivated by the realistic astrophysical black holes that rotate, we use the
Newman-Janis formalism to construct a regular rotating black hole. We start
with a nonlinearl... | [
{
"created": "Sat, 20 Jun 2020 13:50:37 GMT",
"version": "v1"
}
] | 2021-03-17 | [
[
"Hendi",
"S. H.",
""
],
[
"Sajadi",
"S. N.",
""
],
[
"Khademi",
"Maryam.",
""
]
] | Respecting the angular momentum conservation of torque-free systems, it is natural to consider rotating solutions of massive objects. Besides that, motivated by the realistic astrophysical black holes that rotate, we use the Newman-Janis formalism to construct a regular rotating black hole. We start with a nonlinearly ... |
1004.5052 | Alvaro De La Cruz-Dombriz | A. de la Cruz-Dombriz | Some cosmological and astrophysical aspects of modified gravity theories | PhD. thesis, April 2010, Complutense University of Madrid. 129 pages.
Preface, five chapters and conclusions. Two appendices | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This thesis will try to contribute to the understanding of open issues in
cosmology by considering f(R) and brane-world theories. In Chapter 1, we shall
summarize the main features of f(R) gravities in the metric formalism and we
shall introduce both the notion of brane excitations, the branons, and the
brane-skyrmio... | [
{
"created": "Wed, 28 Apr 2010 14:59:46 GMT",
"version": "v1"
},
{
"created": "Thu, 29 Apr 2010 15:41:12 GMT",
"version": "v2"
},
{
"created": "Wed, 5 May 2010 09:32:06 GMT",
"version": "v3"
}
] | 2010-05-06 | [
[
"de la Cruz-Dombriz",
"A.",
""
]
] | This thesis will try to contribute to the understanding of open issues in cosmology by considering f(R) and brane-world theories. In Chapter 1, we shall summarize the main features of f(R) gravities in the metric formalism and we shall introduce both the notion of brane excitations, the branons, and the brane-skyrmions... |
gr-qc/9903092 | Diego A. R. Dalvit | Diego A. R. Dalvit and Francisco D. Mazzitelli | Quantum corrections to the geodesic equation | Revtex file, 6 pages, no figures. Talk presented at the meeting
"Trends in Theoretical Physics II", Buenos Aires, Argentina, December 1998 | null | 10.1063/1.59666 | null | gr-qc | null | In this talk we will argue that, when gravitons are taken into account, the
solution to the semiclassical Einstein equations (SEE) is not physical. The
reason is simple: any classical device used to measure the spacetime geometry
will also feel the graviton fluctuations. As the coupling between the classical
device a... | [
{
"created": "Thu, 25 Mar 1999 18:52:46 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Dalvit",
"Diego A. R.",
""
],
[
"Mazzitelli",
"Francisco D.",
""
]
] | In this talk we will argue that, when gravitons are taken into account, the solution to the semiclassical Einstein equations (SEE) is not physical. The reason is simple: any classical device used to measure the spacetime geometry will also feel the graviton fluctuations. As the coupling between the classical device and... |
1711.08845 | Mehdi Saravani | A. Emir Gumrukcuoglu, Mehdi Saravani and Thomas P. Sotiriou | Ho\v{r}ava Gravity after GW170817 | null | Phys. Rev. D 97, 024032 (2018) | 10.1103/PhysRevD.97.024032 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The recent detection of gravitational wave GW170817 has placed a severe bound
on the deviation of the speed of gravitational waves from the speed of light.
We explore the consequences of this detection for Horava gravity.
| [
{
"created": "Fri, 24 Nov 2017 00:35:41 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Feb 2018 11:15:23 GMT",
"version": "v2"
}
] | 2018-02-12 | [
[
"Gumrukcuoglu",
"A. Emir",
""
],
[
"Saravani",
"Mehdi",
""
],
[
"Sotiriou",
"Thomas P.",
""
]
] | The recent detection of gravitational wave GW170817 has placed a severe bound on the deviation of the speed of gravitational waves from the speed of light. We explore the consequences of this detection for Horava gravity. |
gr-qc/0411057 | Raoul-Martin Memmesheimer | Raoul-Martin Memmesheimer, Gerhard Sch\"afer | Third post-Newtonian constrained canonical dynamics for binary point
masses in harmonic coordinates | 42 pages, submitted to Phys. Rev. D | Phys.Rev.D71:044021,2005 | 10.1103/PhysRevD.71.044021 | null | gr-qc | null | The conservative dynamics of two point masses given in harmonic coordinates
up to the third post-Newtonian (3pN) order is treated within the framework of
constrained canonical dynamics. A representation of the approximate Poincar\'e
algebra is constructed with the aid of Dirac brackets. Uniqueness of the
generators o... | [
{
"created": "Thu, 11 Nov 2004 16:50:05 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Memmesheimer",
"Raoul-Martin",
""
],
[
"Schäfer",
"Gerhard",
""
]
] | The conservative dynamics of two point masses given in harmonic coordinates up to the third post-Newtonian (3pN) order is treated within the framework of constrained canonical dynamics. A representation of the approximate Poincar\'e algebra is constructed with the aid of Dirac brackets. Uniqueness of the generators of ... |
gr-qc/0008033 | Claus Laemmerzahl | Christian J. Bord\'e, Jean-Claude Houard, and Alain Karasiewicz | Relativistic phase shifts for Dirac particles interacting with weak
gravitational fields in matter-wave interferometers | 32 pages, LaTex, needs rotating and lscape usepackages, to appear in
C. L\"ammerzahl, C.W.F. Everitt, F.W. Hehl (eds.): ``Gyros, Clocks, and
Interferometers: Testing Relativistic Gravity in Space'', Springer-Verlag,
Berlin 2000 | Lect.Notes Phys. 562 (2001) 403-438 | 10.1007/3-540-40988-2_21 | null | gr-qc quant-ph | null | We present a second-quantized field theory of massive spin one-half particles
or antiparticles in the presence of a weak gravitational field treated as a
spin two external field in a flat Minkowski background. We solve the
difficulties which arise from the derivative coupling and we are able to
introduce an interacti... | [
{
"created": "Tue, 15 Aug 2000 09:50:11 GMT",
"version": "v1"
}
] | 2016-12-07 | [
[
"Bordé",
"Christian J.",
""
],
[
"Houard",
"Jean-Claude",
""
],
[
"Karasiewicz",
"Alain",
""
]
] | We present a second-quantized field theory of massive spin one-half particles or antiparticles in the presence of a weak gravitational field treated as a spin two external field in a flat Minkowski background. We solve the difficulties which arise from the derivative coupling and we are able to introduce an interaction... |
1309.7428 | S. Davood Sadatian | S. Davood Sadatian | Rip Singularity Scenario and Bouncing Universe in a Chaplygin Gas Dark
Energy Model | 13 pages, 7 figures, Accepted for Publication in IJTP | Int J Theor Phys, 53: pp 675-684 (2014) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We choose a modified Chaplygin Gas Dark energy model for considering some its
cosmological behaviors. In this regards, we study different Rip singularity
scenarios and bouncing model of the universe in context of this model. We show
that by using suitable parameters can explain some cosmological aspects of the
model.... | [
{
"created": "Sat, 28 Sep 2013 05:29:28 GMT",
"version": "v1"
}
] | 2014-01-21 | [
[
"Sadatian",
"S. Davood",
""
]
] | We choose a modified Chaplygin Gas Dark energy model for considering some its cosmological behaviors. In this regards, we study different Rip singularity scenarios and bouncing model of the universe in context of this model. We show that by using suitable parameters can explain some cosmological aspects of the model. |
gr-qc/9407012 | Tevian Dray | Stuart Boersma and Tevian Dray | Parametric Manifolds II: Intrinsic Approach | Plain TeX, 13 pages, no figures | J.Math.Phys. 36 (1995) 1394-1403 | 10.1063/1.531128 | null | gr-qc dg-ga math.DG | null | A parametric manifold is a manifold on which all tensor fields depend on an
additional parameter, such as time, together with a parametric structure,
namely a given (parametric) 1-form field. Such a manifold admits natural
generalizations of Lie differentiation, exterior differentiation, and covariant
differentiation... | [
{
"created": "Tue, 12 Jul 1994 21:38:12 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Boersma",
"Stuart",
""
],
[
"Dray",
"Tevian",
""
]
] | A parametric manifold is a manifold on which all tensor fields depend on an additional parameter, such as time, together with a parametric structure, namely a given (parametric) 1-form field. Such a manifold admits natural generalizations of Lie differentiation, exterior differentiation, and covariant differentiation, ... |
0905.2001 | L. C. Garcia de Andrade | Garcia de Andrade | Cosmic dynamo analogue and decay of magnetic fields in 3D Ricci flows | Departamento de fisica Teorica-IF-Universidade do Estado do Rio de
Janeiro-Brasil | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Magnetic curvature effects, investigated by Barrow and Tsagas (BT) [Phys Rev
D \textbf{77},(2008)],as a mechanism for magnetic field decay in open Friedmann
universes (${\Lambda}<0$), are applied to dynamo geometric Ricci flows in 3D
curved substrate in laboratory. By simple derivation, a covariant
three-dimensional ... | [
{
"created": "Wed, 13 May 2009 02:15:37 GMT",
"version": "v1"
}
] | 2009-05-14 | [
[
"de Andrade",
"Garcia",
""
]
] | Magnetic curvature effects, investigated by Barrow and Tsagas (BT) [Phys Rev D \textbf{77},(2008)],as a mechanism for magnetic field decay in open Friedmann universes (${\Lambda}<0$), are applied to dynamo geometric Ricci flows in 3D curved substrate in laboratory. By simple derivation, a covariant three-dimensional ma... |
gr-qc/0206056 | Pierre Teyssandier | Bernard Linet and Pierre Teyssandier | Quantum phase shift and neutrino oscillations in a stationary, weak
gravitational field | 14 pages, no figure. Enlarged version; added references. In the
Schwarzschild case, our results on the non-radial propagation are compared
with the previous works | Mod.Phys.Lett.A26:1737-1751,2011 | 10.1142/S0217732311036115 | null | gr-qc astro-ph hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new method based on Synge's world function is developed for determining
within the WKB approximation the gravitationally induced quantum phase shift of
a particle propagating in a stationary spacetime. This method avoids any
calculation of geodesics. A detailed treatment is given for relativistic
particles within t... | [
{
"created": "Wed, 19 Jun 2002 14:38:03 GMT",
"version": "v1"
},
{
"created": "Tue, 9 Aug 2011 14:41:29 GMT",
"version": "v2"
}
] | 2011-08-10 | [
[
"Linet",
"Bernard",
""
],
[
"Teyssandier",
"Pierre",
""
]
] | A new method based on Synge's world function is developed for determining within the WKB approximation the gravitationally induced quantum phase shift of a particle propagating in a stationary spacetime. This method avoids any calculation of geodesics. A detailed treatment is given for relativistic particles within the... |
1404.2139 | Haidar Sheikhahmadi | K. Saaidi, H. Sheikhahmadi, T. Golanbari and S.W. Rabiei | On the holographic dark energy in chameleon scalar-tensor cosmology | 10 pages | Astrophys. Space Sci. 348 (2013) 233 | 10.1007/s10509-013-1491-5 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the holographic dark energy (HDE) model in generalized Brans-Dicke
scenario with a non-minimal coupling between the scalar field and matter
lagrangian namely Chameleon Brans Dicke (CBD) mechanism. In this study we
consider the interacting and non-interacting cases for two different cutoffs.
The physical quan... | [
{
"created": "Tue, 8 Apr 2014 14:10:38 GMT",
"version": "v1"
}
] | 2014-07-02 | [
[
"Saaidi",
"K.",
""
],
[
"Sheikhahmadi",
"H.",
""
],
[
"Golanbari",
"T.",
""
],
[
"Rabiei",
"S. W.",
""
]
] | We study the holographic dark energy (HDE) model in generalized Brans-Dicke scenario with a non-minimal coupling between the scalar field and matter lagrangian namely Chameleon Brans Dicke (CBD) mechanism. In this study we consider the interacting and non-interacting cases for two different cutoffs. The physical quanti... |
1009.4816 | Lorenzo Sebastiani | Emilio Bellini, Roberto Di Criscienzo, Lorenzo Sebastiani, Sergio
Zerbini | Black Hole entropy for two higher derivative theories of gravity | 10 pages, 1 figure | Entropy.12:2186,2010 | 10.3390/e12102186 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dark energy issue is focusing the attention of an incresing number of
physicists all over the world. Among the possible alternatives in order to
explain what as been named the "Mystery of the Millennium" are the so-called
Modified Theories of Gravity. A crucial test for such models is represented by
the existence... | [
{
"created": "Fri, 24 Sep 2010 12:07:59 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Nov 2010 16:10:57 GMT",
"version": "v2"
}
] | 2015-05-20 | [
[
"Bellini",
"Emilio",
""
],
[
"Di Criscienzo",
"Roberto",
""
],
[
"Sebastiani",
"Lorenzo",
""
],
[
"Zerbini",
"Sergio",
""
]
] | The dark energy issue is focusing the attention of an incresing number of physicists all over the world. Among the possible alternatives in order to explain what as been named the "Mystery of the Millennium" are the so-called Modified Theories of Gravity. A crucial test for such models is represented by the existence a... |
2003.11128 | Alexander Saffer | Alexander Saffer and Kent Yagi | Parameter Estimation for Tests of General Relativity with the
Astrophysical Stochastic Gravitational Wave Background | 10 pages, 6 figures, submitted to Phys. Rev. D | Phys. Rev. D 102, 024001 (2020) | 10.1103/PhysRevD.102.024001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent observations of gravitational waves from binary black holes and
neutron stars allow us to probe the strong and dynamical field regime of
gravity. On the other hand, a collective signal from many individual,
unresolved sources results in what is known as a stochastic background. We here
consider probing gravity... | [
{
"created": "Tue, 24 Mar 2020 22:00:39 GMT",
"version": "v1"
}
] | 2021-10-08 | [
[
"Saffer",
"Alexander",
""
],
[
"Yagi",
"Kent",
""
]
] | Recent observations of gravitational waves from binary black holes and neutron stars allow us to probe the strong and dynamical field regime of gravity. On the other hand, a collective signal from many individual, unresolved sources results in what is known as a stochastic background. We here consider probing gravity w... |
gr-qc/9609003 | Werner Martins Vieira | Werner M. Vieira and Patricio S. Letelier | Curvature and Chaos in General Relativity | 8 pages, REVTEX, two postscript figures included, to appear in Class.
Quantum Grav | Class.Quant.Grav. 13 (1996) 3115-3120 | 10.1088/0264-9381/13/11/025 | null | gr-qc | null | We clarify some points about the systems considered by Sota, Suzuki and Maeda
in Class. Quantum Grav. 13, 1241 (1996). Contrary to the authors' claim for a
non-homoclinic kind of chaos, we show the chaotic cases they considered are
homoclinic in origin. The power of local criteria to predict chaos is once more
questi... | [
{
"created": "Fri, 30 Aug 1996 12:58:32 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Vieira",
"Werner M.",
""
],
[
"Letelier",
"Patricio S.",
""
]
] | We clarify some points about the systems considered by Sota, Suzuki and Maeda in Class. Quantum Grav. 13, 1241 (1996). Contrary to the authors' claim for a non-homoclinic kind of chaos, we show the chaotic cases they considered are homoclinic in origin. The power of local criteria to predict chaos is once more question... |
2105.01295 | Shao-Wen Wei | Shao-Wen Wei, Yu-Xiao Liu | Testing the microstructure of $d$-dimensional charged Gauss-Bonnet
anti-de Sitter black holes | 18 pages, 15 figures, and 3 tables | Phys. Rev. D 104, 024062 (2021) | 10.1103/PhysRevD.104.024062 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | Understanding black hole microstructure via the thermodynamic geometry can
provide us with more deeper insight into black hole thermodynamics in modified
gravities. In this paper, we study the black hole phase transition and
Ruppeiner geometry for the $d$-dimensional charged Gauss-Bonnet anti-de Sitter
black holes. T... | [
{
"created": "Tue, 4 May 2021 05:21:12 GMT",
"version": "v1"
}
] | 2021-08-04 | [
[
"Wei",
"Shao-Wen",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | Understanding black hole microstructure via the thermodynamic geometry can provide us with more deeper insight into black hole thermodynamics in modified gravities. In this paper, we study the black hole phase transition and Ruppeiner geometry for the $d$-dimensional charged Gauss-Bonnet anti-de Sitter black holes. The... |
gr-qc/0310025 | Hongya Liu | Hongya Liu | Bounce Models in Brane Cosmology and a Gravitational Stability Condition | 18 pages, 3 figures, title changed and references added | null | null | null | gr-qc astro-ph hep-th | null | Five-dimensional cosmological models with two 3-branes and with a buck
cosmological constant are studied. It is found that for all the three cases
($\Lambda =0$, $\Lambda >0$, and $\Lambda <0$), the conventional space-time
singularity ``big bang'' could be replaced by a matter singularity ``big
bounce'', at which the... | [
{
"created": "Sun, 5 Oct 2003 03:38:39 GMT",
"version": "v1"
},
{
"created": "Sun, 4 Jan 2004 03:18:47 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Liu",
"Hongya",
""
]
] | Five-dimensional cosmological models with two 3-branes and with a buck cosmological constant are studied. It is found that for all the three cases ($\Lambda =0$, $\Lambda >0$, and $\Lambda <0$), the conventional space-time singularity ``big bang'' could be replaced by a matter singularity ``big bounce'', at which the `... |
0705.3070 | Martin Reiris | Martin Reiris | The Constant Mean Curvature Einstein flow and the Bel-Robinson energy | 71 pages. This is an improved version of part of arXiv:0705.3070 that
we now replace. An improved version of the second part of arXiv:0705.3070
will come out as a new submission | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We give an extensive treatment of the Constant Mean Curvature (CMC) Einstein
flow from the point of view of the Bel-Robinson energies. The article, in
particular, stresses on estimates showing how the Bel-Robinson energies and the
volume of the evolving states control intrinsically the flow along evolution.
The treat... | [
{
"created": "Mon, 21 May 2007 23:11:32 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Sep 2008 19:07:04 GMT",
"version": "v2"
}
] | 2008-09-19 | [
[
"Reiris",
"Martin",
""
]
] | We give an extensive treatment of the Constant Mean Curvature (CMC) Einstein flow from the point of view of the Bel-Robinson energies. The article, in particular, stresses on estimates showing how the Bel-Robinson energies and the volume of the evolving states control intrinsically the flow along evolution. The treatme... |
1604.08285 | Hiroyuki Nakano | Hiroyuki Nakano, Norichika Sago, Takahiro Tanaka, Takashi Nakamura | Estimate of the radius responsible for quasinormal modes in the extreme
Kerr limit and asymptotic behavior of the Sasaki-Nakamura transformation | 12 pages, 2 figures, added some references, modifications to match
the published version in PTEP | Prog. Theor. Exp. Phys. (2016) 083E01 | 10.1093/ptep/ptw098 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Sasaki-Nakamura transformation gives a short-ranged potential and a
convergent source term for the master equation of perturbations in the Kerr
space-time. In this paper, we study the asymptotic behavior of the
transformation, and present a new relaxed necessary and sufficient condition of
the transformation to o... | [
{
"created": "Thu, 28 Apr 2016 01:59:02 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Jul 2016 00:06:10 GMT",
"version": "v2"
},
{
"created": "Wed, 26 Apr 2017 08:18:42 GMT",
"version": "v3"
}
] | 2017-04-27 | [
[
"Nakano",
"Hiroyuki",
""
],
[
"Sago",
"Norichika",
""
],
[
"Tanaka",
"Takahiro",
""
],
[
"Nakamura",
"Takashi",
""
]
] | The Sasaki-Nakamura transformation gives a short-ranged potential and a convergent source term for the master equation of perturbations in the Kerr space-time. In this paper, we study the asymptotic behavior of the transformation, and present a new relaxed necessary and sufficient condition of the transformation to obt... |
1707.01416 | Kimet Jusufi | Kimet Jusufi, Ali \"Ovg\"un, Ayan Banerjee | Light deflection by charged wormholes in Einstein-Maxwell-dilaton theory | 7 pages, 1 figure, accepted for publication in PRD | Phys. Rev. D 96, 084036 (2017) | 10.1103/PhysRevD.96.084036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the deflection of light by a class of charged
wormholes within the context of the Einstein-Maxwell-dilaton theory. The
primordial wormholes are predicted to exist in the early universe, where
inflation driven by the dilaton field. We perform our analysis through optical
geometry using the Gibb... | [
{
"created": "Wed, 5 Jul 2017 14:25:04 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Oct 2017 09:05:16 GMT",
"version": "v2"
}
] | 2017-10-25 | [
[
"Jusufi",
"Kimet",
""
],
[
"Övgün",
"Ali",
""
],
[
"Banerjee",
"Ayan",
""
]
] | In this paper, we study the deflection of light by a class of charged wormholes within the context of the Einstein-Maxwell-dilaton theory. The primordial wormholes are predicted to exist in the early universe, where inflation driven by the dilaton field. We perform our analysis through optical geometry using the Gibbon... |
1308.2074 | Jan Harms | Jan Harms, Bram J. J. Slagmolen, Rana X. Adhikari, M. Coleman Miller,
Matthew Evans, Yanbei Chen, Holger M\"uller, Masaki Ando | Low-Frequency Terrestrial Gravitational-Wave Detectors | 19 pages, 12 figures | Phys. Rev. D 88, 122003 (2013) | 10.1103/PhysRevD.88.122003 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Direct detection of gravitational radiation in the audio band is being
pursued with a network of kilometer-scale interferometers (LIGO, Virgo, KAGRA).
Several space missions (LISA, DECIGO, BBO) have been proposed to search for
sub-Hz radiation from massive astrophysical sources. Here we examine the
potential sensitiv... | [
{
"created": "Fri, 9 Aug 2013 10:04:28 GMT",
"version": "v1"
}
] | 2013-12-16 | [
[
"Harms",
"Jan",
""
],
[
"Slagmolen",
"Bram J. J.",
""
],
[
"Adhikari",
"Rana X.",
""
],
[
"Miller",
"M. Coleman",
""
],
[
"Evans",
"Matthew",
""
],
[
"Chen",
"Yanbei",
""
],
[
"Müller",
"Holger",
""
],
... | Direct detection of gravitational radiation in the audio band is being pursued with a network of kilometer-scale interferometers (LIGO, Virgo, KAGRA). Several space missions (LISA, DECIGO, BBO) have been proposed to search for sub-Hz radiation from massive astrophysical sources. Here we examine the potential sensitivit... |
gr-qc/0005072 | Mauricio Bellini | Mauricio Bellini (Universidad Nac. de Mar del Plata) | Primordial fluctuations of the metric in the warm inflation scenario | Accepted for publication in Il Nuovo Cimento B, 5 pages, no figures | Nuovo Cim. B115 (2000) 369-374 | null | null | gr-qc | null | I consider a semiclassical expansion of the scalar field in the warm
inflation scenario. I study the evolution for the fluctuations of the metric
around the Friedmann-Robertson-Walker one. The formalism predicts that, in the
power-law expansion universe, the fluctuations of the metric decreases with
time.
| [
{
"created": "Tue, 16 May 2000 17:03:04 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Bellini",
"Mauricio",
"",
"Universidad Nac. de Mar del Plata"
]
] | I consider a semiclassical expansion of the scalar field in the warm inflation scenario. I study the evolution for the fluctuations of the metric around the Friedmann-Robertson-Walker one. The formalism predicts that, in the power-law expansion universe, the fluctuations of the metric decreases with time. |
2008.13753 | Maciej Kolanowski | Maciej Kolanowski and Jerzy Lewandowski | Energy of gravitational radiation in the de Sitter universe at the scri
and at a horizon | 30 pages | Phys. Rev. D 102, 124052 (2020) | 10.1103/PhysRevD.102.124052 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this note we investigate outcomes of a symplectic formula for the
gravitational waves charges in the general relativity linearized around the de
Sitter spacetime. We derive their explicit form at {\it scri} in the Bondi
frame, compare with the connected Noether expression and analyze their gauge
dependence which a... | [
{
"created": "Mon, 31 Aug 2020 17:22:28 GMT",
"version": "v1"
}
] | 2021-01-04 | [
[
"Kolanowski",
"Maciej",
""
],
[
"Lewandowski",
"Jerzy",
""
]
] | In this note we investigate outcomes of a symplectic formula for the gravitational waves charges in the general relativity linearized around the de Sitter spacetime. We derive their explicit form at {\it scri} in the Bondi frame, compare with the connected Noether expression and analyze their gauge dependence which all... |
1007.4250 | Francisco Navarro-Lerida | Masoud Allahverdizadeh, Jutta Kunz and Francisco Navarro-Lerida | Extremal Charged Rotating Dilaton Black Holes in Odd Dimensions | 20 pages, 3 figures | Phys.Rev.D82:064034,2010 | 10.1103/PhysRevD.82.064034 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Employing higher order perturbation theory, we find a new class of charged
rotating black hole solutions of Einstein-Maxwell-dilaton theory with general
dilaton coupling constant. Starting from the Myers-Perry solutions, we use the
electric charge as the perturbative parameter, and focus on extremal black
holes with ... | [
{
"created": "Sat, 24 Jul 2010 06:51:39 GMT",
"version": "v1"
}
] | 2014-11-21 | [
[
"Allahverdizadeh",
"Masoud",
""
],
[
"Kunz",
"Jutta",
""
],
[
"Navarro-Lerida",
"Francisco",
""
]
] | Employing higher order perturbation theory, we find a new class of charged rotating black hole solutions of Einstein-Maxwell-dilaton theory with general dilaton coupling constant. Starting from the Myers-Perry solutions, we use the electric charge as the perturbative parameter, and focus on extremal black holes with eq... |
1410.8527 | Edward Malec | Piotr Jaranowski, Patryk Mach, Edward Malec, Michal Pirog | General-relativistic versus Newtonian: geometric dragging and dynamic
anti-dragging in stationary disks in the first post-Newtonian approximation | Minor changes in the introduction and the summary. Accepted by the
Physical Review D. 12 pages, 5 figures | null | 10.1103/PhysRevD.91.024039 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We evaluate general-relativistic effects in motion of stationary accretion
disks around a Schwarzschild black hole, assuming the first post-Newtonian
(1PN) approximation. There arises an integrability condition, that leads to the
emergence of two types of general-relativistic corrections to a Newtonian
rotation curve... | [
{
"created": "Thu, 30 Oct 2014 17:03:37 GMT",
"version": "v1"
},
{
"created": "Sat, 27 Dec 2014 17:20:03 GMT",
"version": "v2"
}
] | 2015-06-23 | [
[
"Jaranowski",
"Piotr",
""
],
[
"Mach",
"Patryk",
""
],
[
"Malec",
"Edward",
""
],
[
"Pirog",
"Michal",
""
]
] | We evaluate general-relativistic effects in motion of stationary accretion disks around a Schwarzschild black hole, assuming the first post-Newtonian (1PN) approximation. There arises an integrability condition, that leads to the emergence of two types of general-relativistic corrections to a Newtonian rotation curve. ... |
1305.0217 | Markus B. Fr\"ob | Markus B. Fr\"ob | Fully renormalized stress tensor correlator in flat space | 23 pages, 2 figures | null | 10.1103/PhysRevD.88.045011 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general procedure to renormalize the stress tensor two-point
correlation function on a Minkowski background in position space. The method is
shown in detail for the case of a free massive scalar field in the standard
Minkowski vacuum state, and explicit expressions are given for the counterterms
and fini... | [
{
"created": "Wed, 1 May 2013 16:22:11 GMT",
"version": "v1"
}
] | 2013-08-14 | [
[
"Fröb",
"Markus B.",
""
]
] | We present a general procedure to renormalize the stress tensor two-point correlation function on a Minkowski background in position space. The method is shown in detail for the case of a free massive scalar field in the standard Minkowski vacuum state, and explicit expressions are given for the counterterms and finite... |
gr-qc/0505049 | Ivan S. N. Booth | Ivan Booth, Stephen Fairhurst | Horizon energy and angular momentum from a Hamiltonian perspective | 39 pages, 3 figures, Final Version : content essentially unchanged
but many small improvements made in response to referees, a few references
added | Class.Quant.Grav. 22 (2005) 4515-4550 | 10.1088/0264-9381/22/21/006 | null | gr-qc | null | Classical black holes and event horizons are highly non-local objects,
defined in terms of the causal past of future null infinity. Alternative,
(quasi)local definitions are often used in mathematical, quantum, and numerical
relativity. These include apparent, trapping, isolated, and dynamical horizons,
all of which ... | [
{
"created": "Wed, 11 May 2005 12:22:18 GMT",
"version": "v1"
},
{
"created": "Thu, 20 Oct 2005 15:27:43 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Booth",
"Ivan",
""
],
[
"Fairhurst",
"Stephen",
""
]
] | Classical black holes and event horizons are highly non-local objects, defined in terms of the causal past of future null infinity. Alternative, (quasi)local definitions are often used in mathematical, quantum, and numerical relativity. These include apparent, trapping, isolated, and dynamical horizons, all of which ar... |
gr-qc/0701081 | D. Petroff | David Petroff | Slowly Rotating Homogeneous Stars and the Heun Equation | 16 pages, uses document class iopart, v2: minor corrections | Class.Quant.Grav.24:1055-1068,2007 | 10.1088/0264-9381/24/5/003 | null | gr-qc math-ph math.MP | null | The scheme developed by Hartle for describing slowly rotating bodies in 1967
was applied to the simple model of constant density by Chandrasekhar and Miller
in 1974. The pivotal equation one has to solve turns out to be one of Heun's
equations. After a brief discussion of this equation and the chances of finding
a cl... | [
{
"created": "Mon, 15 Jan 2007 14:49:05 GMT",
"version": "v1"
},
{
"created": "Tue, 6 Feb 2007 14:23:47 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Petroff",
"David",
""
]
] | The scheme developed by Hartle for describing slowly rotating bodies in 1967 was applied to the simple model of constant density by Chandrasekhar and Miller in 1974. The pivotal equation one has to solve turns out to be one of Heun's equations. After a brief discussion of this equation and the chances of finding a clos... |
0802.2447 | Ugo Moschella | Ugo Moschella, Richard Schaeffer | A note on canonical quantization of fields on a manifold | null | JCAP 0902:033,2009 | 10.1088/1475-7516/2009/02/033 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a general construction of quantum states for linear canonical
quantum fields on a manifold, which encompasses and generalizes the "standard"
procedures existing in textbooks. Our method provides pure and mixed states on
the same footing. A large class of examples finds a simple and unified
treatment in our... | [
{
"created": "Mon, 18 Feb 2008 13:32:42 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Apr 2009 14:17:15 GMT",
"version": "v2"
}
] | 2009-04-01 | [
[
"Moschella",
"Ugo",
""
],
[
"Schaeffer",
"Richard",
""
]
] | We propose a general construction of quantum states for linear canonical quantum fields on a manifold, which encompasses and generalizes the "standard" procedures existing in textbooks. Our method provides pure and mixed states on the same footing. A large class of examples finds a simple and unified treatment in our a... |
gr-qc/0209002 | Wolfgang Graf | Wolfgang Graf | Geometric Dilaton Coupling and Smooth Charged Wormholes | 23 pages, 1 table, 1 TeX-figure. Minor changes, to agree with with
paper accepted for publication by Phys. Rev. D | Phys.Rev.D67:024002,2003 | 10.1103/PhysRevD.67.024002 | UWThPh-2002-24 | gr-qc hep-th | null | A particular type of coupling of the dilaton field to the metric is shown to
admit a simple geometric interpretation in terms of a volume element density
independent from the metric. For dimension n = 4 two families of either
magnetically or electrically charged static spherically symmetric solutions to
the Maxwell-E... | [
{
"created": "Mon, 2 Sep 2002 18:19:56 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Nov 2002 21:11:14 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Graf",
"Wolfgang",
""
]
] | A particular type of coupling of the dilaton field to the metric is shown to admit a simple geometric interpretation in terms of a volume element density independent from the metric. For dimension n = 4 two families of either magnetically or electrically charged static spherically symmetric solutions to the Maxwell-Ein... |
gr-qc/0105061 | Diego Jose Navarro Sanz | A. Fabbri (Bologna U. and INFN), D. J. Navarro and J. Navarro-Salas
(Valencia U. and IFIC) | A Planck-like problem for quantum charged black holes | 6 pages, LaTeX file, Awarded Fifth Prize in the Gravity Research
Foundation Essay Competition for 2001 | Gen.Rel.Grav. 33 (2001) 2119-2124 | 10.1023/A:1015289603115 | null | gr-qc hep-th | null | Motivated by the parallelism existing between the puzzles of classical
physics at the beginning of the XXth century and the current paradoxes in the
search of a quantum theory of gravity, we give, in analogy with Planck's black
body radiation problem, a solution for the exact Hawking flux of evaporating
Reissner-Nord... | [
{
"created": "Thu, 17 May 2001 16:37:53 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Fabbri",
"A.",
"",
"Bologna U. and INFN"
],
[
"Navarro",
"D. J.",
"",
"Valencia U. and IFIC"
],
[
"Navarro-Salas",
"J.",
"",
"Valencia U. and IFIC"
]
] | Motivated by the parallelism existing between the puzzles of classical physics at the beginning of the XXth century and the current paradoxes in the search of a quantum theory of gravity, we give, in analogy with Planck's black body radiation problem, a solution for the exact Hawking flux of evaporating Reissner-Nordst... |
2407.09970 | Aaqid Bhat | Raja Solanki, Aaqid Bhat, P.K. Sahoo | Bulk viscous cosmological model in $f(T,\mathcal{T})$ modified gravity | Astroparticle Physics accepted version | Astroparticle Physics, 163 (2024) 103013 | 10.1016/j.astropartphys.2024.103013 | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | This article explores the impact of bulk viscosity on understanding the
universe's accelerated expansion within the context of modified
$f(T,\mathcal{T})$ gravity, which is an extension of the $f(T)$ gravitational
theory, allowing a broad coupling between the energy-momentum scalar
$\mathcal{T}$ and the torsion scala... | [
{
"created": "Sat, 13 Jul 2024 18:19:59 GMT",
"version": "v1"
}
] | 2024-07-29 | [
[
"Solanki",
"Raja",
""
],
[
"Bhat",
"Aaqid",
""
],
[
"Sahoo",
"P. K.",
""
]
] | This article explores the impact of bulk viscosity on understanding the universe's accelerated expansion within the context of modified $f(T,\mathcal{T})$ gravity, which is an extension of the $f(T)$ gravitational theory, allowing a broad coupling between the energy-momentum scalar $\mathcal{T}$ and the torsion scalar ... |
1812.08686 | Marvin L\"uben | Marvin L\"uben, Edvard M\"ortsell and Angnis Schmidt-May | Bimetric cosmology is compatible with local tests of gravity | 6 pages, 2 figures | null | null | MPP-2018-303 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Kenna-Allison et.al. claimed that bimetric gravity cannot give rise
to a viable cosmological expansion history while at the same time being
compatible with local gravity tests. In this note we review that claim and
combine various results from the literature to provide several simple counter
examples. We co... | [
{
"created": "Thu, 20 Dec 2018 16:38:47 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Oct 2019 19:02:15 GMT",
"version": "v2"
}
] | 2019-10-16 | [
[
"Lüben",
"Marvin",
""
],
[
"Mörtsell",
"Edvard",
""
],
[
"Schmidt-May",
"Angnis",
""
]
] | Recently, Kenna-Allison et.al. claimed that bimetric gravity cannot give rise to a viable cosmological expansion history while at the same time being compatible with local gravity tests. In this note we review that claim and combine various results from the literature to provide several simple counter examples. We conc... |
2407.01478 | Orhan Donmez | Orhan Donmez and Fatih Dogan | Estimating the possible QPOs of M87* from the parameters of a hairy Kerr
black hole | 39 pages, 11 figures, updated | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the dynamics of the shock cone formed around the
hairy Kerr black hole due to BHL accretion and investigate the QPO behaviors
resulting from the black hole-cone interaction, aiming to predict the QPO
frequencies that may occur around the M87* black hole. To achieve this, we use
the hairy Kerr ... | [
{
"created": "Mon, 1 Jul 2024 17:09:35 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Aug 2024 21:33:36 GMT",
"version": "v2"
}
] | 2024-08-16 | [
[
"Donmez",
"Orhan",
""
],
[
"Dogan",
"Fatih",
""
]
] | In this paper, we study the dynamics of the shock cone formed around the hairy Kerr black hole due to BHL accretion and investigate the QPO behaviors resulting from the black hole-cone interaction, aiming to predict the QPO frequencies that may occur around the M87* black hole. To achieve this, we use the hairy Kerr bl... |
0705.3024 | Steven Carlip | S. Carlip | Symmetries, Horizons, and Black Hole Entropy | 6 pages; first prize essay, 2007 Gravity Research Foundation essay
contest | Gen.Rel.Grav.39:1519-1523,2007; Int.J.Mod.Phys.D17:659-664,2008 | 10.1007/s10714-007-0467-6 10.1142/S0218271808012401 | null | gr-qc hep-th | null | Black holes behave as thermodynamic systems, and a central task of any
quantum theory of gravity is to explain these thermal properties. A statistical
mechanical description of black hole entropy once seemed remote, but today we
suffer an embarrassment of riches: despite counting very different states, many
inequival... | [
{
"created": "Mon, 21 May 2007 17:45:39 GMT",
"version": "v1"
}
] | 2010-04-28 | [
[
"Carlip",
"S.",
""
]
] | Black holes behave as thermodynamic systems, and a central task of any quantum theory of gravity is to explain these thermal properties. A statistical mechanical description of black hole entropy once seemed remote, but today we suffer an embarrassment of riches: despite counting very different states, many inequivalen... |
0805.2955 | Andrew Randono | Andrew Randono | A Mesoscopic Quantum Gravity Effect | 10 pages, 2 figures | Gen.Rel.Grav.42:1909-1917,2010 | 10.1007/s10714-010-0982-8 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We explore the symmetry reduced form of a non-perturbative solution to the
constraints of quantum gravity corresponding to quantum de Sitter space. The
system has a remarkably precise analogy with the non-relativistic formulation
of a particle falling in a constant gravitational field that we exploit in our
anaylsis.... | [
{
"created": "Mon, 19 May 2008 21:02:05 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Randono",
"Andrew",
""
]
] | We explore the symmetry reduced form of a non-perturbative solution to the constraints of quantum gravity corresponding to quantum de Sitter space. The system has a remarkably precise analogy with the non-relativistic formulation of a particle falling in a constant gravitational field that we exploit in our anaylsis. W... |
1811.03446 | Marco Cariglia Dr | Marco Cariglia | General theory of Galilean gravity | 6 pages, no figures. V2: references added | null | 10.1103/PhysRevD.98.084057 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtain the complete theory of Newton-Cartan gravity in a curved spacetime
by considering the large $c$ limit of the vielbein formulation of General
Relativity. Milne boosts originate from local Lorentzian transformations, and
the special cases of torsionless and twistless torsional geometries are
explained in the ... | [
{
"created": "Tue, 6 Nov 2018 22:26:46 GMT",
"version": "v1"
},
{
"created": "Sat, 10 Nov 2018 14:42:36 GMT",
"version": "v2"
}
] | 2018-11-13 | [
[
"Cariglia",
"Marco",
""
]
] | We obtain the complete theory of Newton-Cartan gravity in a curved spacetime by considering the large $c$ limit of the vielbein formulation of General Relativity. Milne boosts originate from local Lorentzian transformations, and the special cases of torsionless and twistless torsional geometries are explained in the co... |
gr-qc/9910063 | null | G. K\"albermann (Soil and Water department, Faculty of Agriculure,
Hebrew University, Israel) | Communication through an extra dimension | Latex format, 12 pages. References modified | Int.J.Mod.Phys. A15 (2000) 3197-3206 | 10.1142/S0217751X00001920 | null | gr-qc hep-ph hep-th | null | If our visible universe is considered a trapped shell in a five-dimensional
hyper-universe, all matter in it may be connected by superluminal signals
traveling through the fifth dimension. Events in the shell are still causal,
however, the propagation of signals proceeds at different velocities depending
on the fifth... | [
{
"created": "Tue, 19 Oct 1999 07:59:36 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Oct 1999 07:34:43 GMT",
"version": "v2"
}
] | 2016-12-21 | [
[
"Kälbermann",
"G.",
"",
"Soil and Water department, Faculty of Agriculure,\n Hebrew University, Israel"
]
] | If our visible universe is considered a trapped shell in a five-dimensional hyper-universe, all matter in it may be connected by superluminal signals traveling through the fifth dimension. Events in the shell are still causal, however, the propagation of signals proceeds at different velocities depending on the fifth c... |
1410.1894 | Carlos Molina Mendes | M. C. Baldiotti, Walace S. Elias, C. Molina, Thiago S. Pereira | Thermodynamics of quantum photon spheres | Published version | Phys. Rev. D 90, 104025 (2014) | 10.1103/PhysRevD.90.104025 | null | gr-qc astro-ph.HE hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Photon spheres, surfaces where massless particles are confined in closed
orbits, are expected to be common astrophysical structures surrounding
ultracompact objects. In this paper a semiclassical treatment of a photon
sphere is proposed. We consider the quantum Maxwell field and derive its energy
spectra. A thermodyn... | [
{
"created": "Tue, 7 Oct 2014 20:15:50 GMT",
"version": "v1"
},
{
"created": "Fri, 21 Nov 2014 17:51:48 GMT",
"version": "v2"
}
] | 2014-11-24 | [
[
"Baldiotti",
"M. C.",
""
],
[
"Elias",
"Walace S.",
""
],
[
"Molina",
"C.",
""
],
[
"Pereira",
"Thiago S.",
""
]
] | Photon spheres, surfaces where massless particles are confined in closed orbits, are expected to be common astrophysical structures surrounding ultracompact objects. In this paper a semiclassical treatment of a photon sphere is proposed. We consider the quantum Maxwell field and derive its energy spectra. A thermodynam... |
1604.06369 | Sanjeev S. Seahra | Jack Gegenberg, Shohreh Rahmati, Sanjeev S. Seahra | A big bounce, slow-roll inflation and dark energy from conformal gravity | 8 pages, 3 figures, references added, version matches the one
published in PRD | Phys. Rev. D 95, 043509 (2017) | 10.1103/PhysRevD.95.043509 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the cosmological sector of a gauge theory of gravity based on the
SO(4,2) conformal group of Minkowski space. We allow for conventional matter
coupled to the spacetime metric as well as matter coupled to the field that
gauges special conformal transformations. An effective cosmological constant is
generate... | [
{
"created": "Thu, 21 Apr 2016 16:06:07 GMT",
"version": "v1"
},
{
"created": "Thu, 28 Apr 2016 13:51:06 GMT",
"version": "v2"
},
{
"created": "Mon, 1 May 2017 13:32:34 GMT",
"version": "v3"
}
] | 2017-05-02 | [
[
"Gegenberg",
"Jack",
""
],
[
"Rahmati",
"Shohreh",
""
],
[
"Seahra",
"Sanjeev S.",
""
]
] | We examine the cosmological sector of a gauge theory of gravity based on the SO(4,2) conformal group of Minkowski space. We allow for conventional matter coupled to the spacetime metric as well as matter coupled to the field that gauges special conformal transformations. An effective cosmological constant is generated ... |
gr-qc/0112050 | Julio Cesar Fabris | Julio C. Fabris | In the Search of Singularity-Free Cosmological Models in Effective
Actions | Latex file, 14 pages, to appear in the "Mario Novello Festschrift" | null | null | null | gr-qc | null | Fundamental theories, like strings, supergravity, Kaluza-Klein, lead after
dimensional reduction and a suitable choice of field configurations, to an
effective action in four dimensions where gravity is coupled non-mininally to
one scalar field, and minimally to another scalar field. These scalar fields
couple non-tr... | [
{
"created": "Wed, 19 Dec 2001 19:16:55 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Fabris",
"Julio C.",
""
]
] | Fundamental theories, like strings, supergravity, Kaluza-Klein, lead after dimensional reduction and a suitable choice of field configurations, to an effective action in four dimensions where gravity is coupled non-mininally to one scalar field, and minimally to another scalar field. These scalar fields couple non-triv... |
1301.0200 | Remo Garattini | Remo Garattini and Gianluca Mandanici | Finite Zero Point Gravitational Energy in the context of Modified
Dispersion Relations | 3 pages; contribution to the proceedings of the Thirteenth Marcel
Grossmann Meeting, Stockholm University, Sweden, 1-7 July, 2012; based on a
talk in the ST1"Planckian and Transplanckian Physics" parallel session | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the Zero Point Energy in a spherically symmetric background
distorted at high energy as predicted by Gravity's Rainbow. In this context we
setup a Sturm-Liouville problem with the cosmological constant considered as
the associated eigenvalue. The eigenvalue equation is a reformulation of the
Wheeler-DeWitt... | [
{
"created": "Wed, 2 Jan 2013 10:15:32 GMT",
"version": "v1"
}
] | 2013-01-03 | [
[
"Garattini",
"Remo",
""
],
[
"Mandanici",
"Gianluca",
""
]
] | We compute the Zero Point Energy in a spherically symmetric background distorted at high energy as predicted by Gravity's Rainbow. In this context we setup a Sturm-Liouville problem with the cosmological constant considered as the associated eigenvalue. The eigenvalue equation is a reformulation of the Wheeler-DeWitt e... |
gr-qc/0109029 | Krasnikov | S. Krasnikov | The time travel paradox | Minor changes + an explanatory note concerning the lions with the
same world lines | Phys.Rev. D65 (2002) 064013 | 10.1103/PhysRevD.65.064013 | null | gr-qc | null | We define the time travel paradox in physical terms and prove its existence
by constructing an explicit example. We argue further that in theories -- such
as general relativity -- where the spacetime geometry is subject to nothing but
differential equations and initial data no paradoxes arise.
| [
{
"created": "Mon, 10 Sep 2001 00:08:32 GMT",
"version": "v1"
},
{
"created": "Wed, 27 Mar 2002 22:25:06 GMT",
"version": "v2"
}
] | 2009-11-07 | [
[
"Krasnikov",
"S.",
""
]
] | We define the time travel paradox in physical terms and prove its existence by constructing an explicit example. We argue further that in theories -- such as general relativity -- where the spacetime geometry is subject to nothing but differential equations and initial data no paradoxes arise. |
gr-qc/9704006 | Diego Torres | Diego F. Torres | Boson Stars in General Scalar-Tensor Gravitation: Equilibrium
Configurations | 19 pages in latex, 3 figures -postscript- may be sent via e-mail upon
request | Phys.Rev.D56:3478-3484,1997 | 10.1103/PhysRevD.56.3478 | null | gr-qc | null | We study equilibrium configurations of boson stars in the framework of
general scalar-tensor theories of gravitation. We analyse several possible
couplings, with acceptable weak field limit and, when known, nucleosynthesis
bounds, in order to work in the cosmologically more realistic cases of this
kind of theories. W... | [
{
"created": "Wed, 2 Apr 1997 16:15:02 GMT",
"version": "v1"
}
] | 2011-09-09 | [
[
"Torres",
"Diego F.",
""
]
] | We study equilibrium configurations of boson stars in the framework of general scalar-tensor theories of gravitation. We analyse several possible couplings, with acceptable weak field limit and, when known, nucleosynthesis bounds, in order to work in the cosmologically more realistic cases of this kind of theories. We ... |
2402.05461 | B. S. Ratanpal | R. Sharma, B. S. Ratanpal and Rinkal Patel | Anisotropic star with a linear equation of state (EOS) | nil | null | null | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A family of solutions defining the interior of a static, spherically
symmetric, compact anisotropic star is described by considering a new form of
the equation of state (EOS). The analytic solution is derived by using the
Finch and Skea ansatz for the metric potential g_rr, which has a clear
geometric interpretation ... | [
{
"created": "Thu, 8 Feb 2024 07:42:44 GMT",
"version": "v1"
}
] | 2024-02-09 | [
[
"Sharma",
"R.",
""
],
[
"Ratanpal",
"B. S.",
""
],
[
"Patel",
"Rinkal",
""
]
] | A family of solutions defining the interior of a static, spherically symmetric, compact anisotropic star is described by considering a new form of the equation of state (EOS). The analytic solution is derived by using the Finch and Skea ansatz for the metric potential g_rr, which has a clear geometric interpretation fo... |
1912.05583 | Guillem Dom\`enech | Guillem Dom\`enech | Induced gravitational waves in a general cosmological background | revised version | null | 10.1142/S0218271820500285 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves are inevitably produced by second order terms in
cosmological perturbation theory. Most notably, the so-called induced
gravitational waves are a window to the small scales part of the primordial
spectrum of fluctuations and a key counterpart to the primordial black hole
scenario. However, semi-ana... | [
{
"created": "Wed, 11 Dec 2019 19:15:23 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Dec 2019 21:36:52 GMT",
"version": "v2"
},
{
"created": "Sun, 23 Feb 2020 16:28:32 GMT",
"version": "v3"
}
] | 2020-04-22 | [
[
"Domènech",
"Guillem",
""
]
] | Gravitational waves are inevitably produced by second order terms in cosmological perturbation theory. Most notably, the so-called induced gravitational waves are a window to the small scales part of the primordial spectrum of fluctuations and a key counterpart to the primordial black hole scenario. However, semi-analy... |
0804.3693 | Alan D. Rendall | Nikolaus Berndt and Alan D. Rendall | Isotropization in the approach to big rip singularities for Cardassian
models | 17 pages, 2 figures | Class.Quant.Grav.25:145007,2008 | 10.1088/0264-9381/25/14/145007 | AEI-2008-026 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Cardassian models are an alternative to general relativity which have been
proposed as an approach to explaining accelerated cosmic expansion while
avoiding directly introducing dark energy. They are generally formulated only
in the homogeneous and isotropic case. In this paper an extension of the usual
formulation t... | [
{
"created": "Wed, 23 Apr 2008 11:38:45 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Berndt",
"Nikolaus",
""
],
[
"Rendall",
"Alan D.",
""
]
] | Cardassian models are an alternative to general relativity which have been proposed as an approach to explaining accelerated cosmic expansion while avoiding directly introducing dark energy. They are generally formulated only in the homogeneous and isotropic case. In this paper an extension of the usual formulation to ... |
1905.02056 | Abbas Sherif | Abbas Sherif, Rituparno Goswami and Sunil Maharaj | Some Result on Cosmological and Astrophysical Horizons and Trapped
Surfaces | 26 pages, | Class. Quantum Grav. 36 (2019) 215001 | 10.1088/1361-6382/ab45bc | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the evolution of horizons of black holes in the $1+1+2$ covariant
setting and investigate various properties intrinsic to the geometry of the
foliation surfaces of these horizons. This is done by interpreting formulations
of various quantities in terms of the geometric and thermodynamic quantities.
We establ... | [
{
"created": "Mon, 6 May 2019 14:12:22 GMT",
"version": "v1"
},
{
"created": "Mon, 14 Oct 2019 18:48:49 GMT",
"version": "v2"
}
] | 2019-10-16 | [
[
"Sherif",
"Abbas",
""
],
[
"Goswami",
"Rituparno",
""
],
[
"Maharaj",
"Sunil",
""
]
] | We study the evolution of horizons of black holes in the $1+1+2$ covariant setting and investigate various properties intrinsic to the geometry of the foliation surfaces of these horizons. This is done by interpreting formulations of various quantities in terms of the geometric and thermodynamic quantities. We establis... |
2301.10867 | Ewa Czuchry | Ewa Czuchry | Resolution of cosmological singularity in Ho\v{r}ava-Lifshitz cosmology | Submitted to Universe. Rewritten in order to remove repetitions from
the previous papers | Universe 9, 160 (2023) | 10.3390/universe9040160 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | The standard $\Lambda$CDM model despite its agreement with observational data
still has some issues unaddressed, lie the problem of initial singularity.
Solving that problem usually requires modifications of general relativity.
However, there appeared the Ho\v{r}ava-Lifshitz (HL) theory of gravity, in
which equations... | [
{
"created": "Wed, 25 Jan 2023 23:29:22 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 2023 21:26:37 GMT",
"version": "v2"
}
] | 2023-03-29 | [
[
"Czuchry",
"Ewa",
""
]
] | The standard $\Lambda$CDM model despite its agreement with observational data still has some issues unaddressed, lie the problem of initial singularity. Solving that problem usually requires modifications of general relativity. However, there appeared the Ho\v{r}ava-Lifshitz (HL) theory of gravity, in which equations g... |
gr-qc/9712059 | Jose-Luis Rosales | Jose-Luis Rosales | Thermodynamics, topology and dimension of initial real tunneling
manifolds | null | null | null | FR-THEP-NR 97/34 | gr-qc | null | We develop the argument that initial real tunneling in quantum gravity be
contemplated as a thermodynamical analogous to a black hole condensate in
equilibrium with Hawking's radiation in a box. The total entropy is always
maximized in the Lorentzian sector of the manifold, and, in this sense,
tunneling is predicted.... | [
{
"created": "Fri, 12 Dec 1997 14:19:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Rosales",
"Jose-Luis",
""
]
] | We develop the argument that initial real tunneling in quantum gravity be contemplated as a thermodynamical analogous to a black hole condensate in equilibrium with Hawking's radiation in a box. The total entropy is always maximized in the Lorentzian sector of the manifold, and, in this sense, tunneling is predicted. |
2011.06303 | Andrea Orizzonte | Alice Bonino, Stefano Camera, Lorenzo Fatibene and Andrea Orizzonte | Solar System Tests in Brans-Dicke and Palatini f(R)-theories | 22 pages, 2 figures | null | 10.1140/epjp/s13360-020-00982-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compare Mercury's precession test in standard General Relativity (GR),
Brans-Dicke theories (BD), and Palatini f(R)-theories. We avoid post Newtonian
(PN) approximation and compute exact precession in these theories. We show that
the well-known mathematical equivalence between Palatini f(R)-theories and a
specific... | [
{
"created": "Thu, 12 Nov 2020 10:35:04 GMT",
"version": "v1"
}
] | 2022-01-11 | [
[
"Bonino",
"Alice",
""
],
[
"Camera",
"Stefano",
""
],
[
"Fatibene",
"Lorenzo",
""
],
[
"Orizzonte",
"Andrea",
""
]
] | We compare Mercury's precession test in standard General Relativity (GR), Brans-Dicke theories (BD), and Palatini f(R)-theories. We avoid post Newtonian (PN) approximation and compute exact precession in these theories. We show that the well-known mathematical equivalence between Palatini f(R)-theories and a specific s... |
0803.1704 | Hideki Maeda | Hideki Maeda and Masato Nozawa | Static and symmetric wormholes respecting energy conditions in
Einstein-Gauss-Bonnet gravity | 10 pages, 2 tables; v2, typos corrected, references added; v3,
interpretation of the solution for n=5 in section IV corrected; v4, a very
final version to appear in Physical Review D | Phys.Rev.D78:024005,2008 | 10.1103/PhysRevD.78.024005 | CECS-PHY-08/03 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Properties of $n(\ge 5)$-dimensional static wormhole solutions are
investigated in Einstein-Gauss-Bonnet gravity with or without a cosmological
constant $\Lambda$. We assume that the spacetime has symmetries corresponding
to the isometries of an $(n-2)$-dimensional maximally symmetric space with the
sectional curvatu... | [
{
"created": "Wed, 12 Mar 2008 05:06:39 GMT",
"version": "v1"
},
{
"created": "Mon, 17 Mar 2008 18:11:41 GMT",
"version": "v2"
},
{
"created": "Wed, 4 Jun 2008 23:24:29 GMT",
"version": "v3"
},
{
"created": "Thu, 3 Jul 2008 22:00:31 GMT",
"version": "v4"
}
] | 2008-11-26 | [
[
"Maeda",
"Hideki",
""
],
[
"Nozawa",
"Masato",
""
]
] | Properties of $n(\ge 5)$-dimensional static wormhole solutions are investigated in Einstein-Gauss-Bonnet gravity with or without a cosmological constant $\Lambda$. We assume that the spacetime has symmetries corresponding to the isometries of an $(n-2)$-dimensional maximally symmetric space with the sectional curvature... |
gr-qc/9804018 | Uwe Gunther | U. Guenther, A. Zhuk | Multidimensional perfect fluid cosmology with stable compactified
internal dimensions | 11 pages, Latex2e, uses IOP packages, submitted to Class.Quant.Grav | Class.Quant.Grav. 15 (1998) 2025-2035 | 10.1088/0264-9381/15/7/017 | null | gr-qc astro-ph hep-th | null | Multidimensional cosmological models in the presence of a bare cosmological
constant and a perfect fluid are investigated under dimensional reduction to
4-dimensional effective models. Stable compactification of the internal spaces
is achieved for a special class of perfect fluids. The external space behaves
in accor... | [
{
"created": "Mon, 6 Apr 1998 10:55:38 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Guenther",
"U.",
""
],
[
"Zhuk",
"A.",
""
]
] | Multidimensional cosmological models in the presence of a bare cosmological constant and a perfect fluid are investigated under dimensional reduction to 4-dimensional effective models. Stable compactification of the internal spaces is achieved for a special class of perfect fluids. The external space behaves in accorda... |
gr-qc/0111072 | Roberto Casadio | Roberto Casadio, Alessandro Fabbri, Lorenzo Mazzacurati | New black holes in the brane-world? | 4 pages, RevTeX, 3 eps figures, final version to appear in Phys. Rev.
D | Phys.Rev.D65:084040,2002 | 10.1103/PhysRevD.65.084040 | null | gr-qc astro-ph hep-th | null | It is known that the Einstein field equations in five dimensions admit more
general spherically symmetric black holes on the brane than four-dimensional
general relativity. We propose two families of analytic solutions (with
g_tt\not=-1/g_rr), parameterized by the ADM mass and the PPN parameter beta,
which reduce to ... | [
{
"created": "Wed, 21 Nov 2001 16:13:17 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Jan 2002 09:53:29 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Casadio",
"Roberto",
""
],
[
"Fabbri",
"Alessandro",
""
],
[
"Mazzacurati",
"Lorenzo",
""
]
] | It is known that the Einstein field equations in five dimensions admit more general spherically symmetric black holes on the brane than four-dimensional general relativity. We propose two families of analytic solutions (with g_tt\not=-1/g_rr), parameterized by the ADM mass and the PPN parameter beta, which reduce to Sc... |
1806.07782 | Muhammed Amir | Muhammed Amir, Kimet Jusufi, Ayan Banerjee, Sudan Hansraj | Shadow images of Kerr-like wormholes | 21 pages, 5 figures, accepted version for publication in CQG | Class. Quantum Grav. 36, 215007 (2019) | 10.1088/1361-6382/ab42be | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Investigations of shadows of astrophysical entities constitute a major source
of insight into the evolution of compact objects. Such effects depend on the
nature of the compact object and arise on account of the strong gravitational
lensing that casts a shadow on the bright background. We consider the Kerr-like
wormh... | [
{
"created": "Wed, 20 Jun 2018 15:10:29 GMT",
"version": "v1"
},
{
"created": "Mon, 9 Sep 2019 09:42:29 GMT",
"version": "v2"
}
] | 2019-10-21 | [
[
"Amir",
"Muhammed",
""
],
[
"Jusufi",
"Kimet",
""
],
[
"Banerjee",
"Ayan",
""
],
[
"Hansraj",
"Sudan",
""
]
] | Investigations of shadows of astrophysical entities constitute a major source of insight into the evolution of compact objects. Such effects depend on the nature of the compact object and arise on account of the strong gravitational lensing that casts a shadow on the bright background. We consider the Kerr-like wormhol... |
0803.1714 | Nima Khosravi | N. Khosravi, H. R. Sepangi | The cosmological implications of a fundamental length: a DSR inspired
de-Sitter spacetime | 10 pages, 3 figures, to appear in JCAP | JCAP 0804:011,2008 | 10.1088/1475-7516/2008/04/011 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a de-Sitter model in the framework of a Deformed Special Relativity
(DSR) inspired structure. The effects of this framework appear as the existence
of a fundamental length which influences the behavior of the scale factor. We
show that such a deformation can either be used to control the unbounded growth
of ... | [
{
"created": "Wed, 12 Mar 2008 08:08:04 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Apr 2008 05:36:02 GMT",
"version": "v2"
}
] | 2009-12-15 | [
[
"Khosravi",
"N.",
""
],
[
"Sepangi",
"H. R.",
""
]
] | We study a de-Sitter model in the framework of a Deformed Special Relativity (DSR) inspired structure. The effects of this framework appear as the existence of a fundamental length which influences the behavior of the scale factor. We show that such a deformation can either be used to control the unbounded growth of th... |
0911.0437 | Claudio Perini | Elena Magliaro, Claudio Perini, Leonardo Modesto | Fractal Space-Time from Spin-Foams | 5 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we perform the calculation of the spectral dimension of
spacetime in 4d quantum gravity using the Barrett-Crane (BC) spinfoam model. We
realize this considering a very simple decomposition of the 4d spacetime
already used in the graviton propagator calculation and we introduce a boundary
state which sel... | [
{
"created": "Mon, 2 Nov 2009 21:21:12 GMT",
"version": "v1"
}
] | 2009-11-04 | [
[
"Magliaro",
"Elena",
""
],
[
"Perini",
"Claudio",
""
],
[
"Modesto",
"Leonardo",
""
]
] | In this paper we perform the calculation of the spectral dimension of spacetime in 4d quantum gravity using the Barrett-Crane (BC) spinfoam model. We realize this considering a very simple decomposition of the 4d spacetime already used in the graviton propagator calculation and we introduce a boundary state which selec... |
2207.00968 | Vinod Bhardwaj Dr. | Vinod Kumar Bhardwaj, Priyanka Garg, Anirudh Pradhan, Syamala
Krishnannair | Corrected holographic dark energy with power-law entropy and Hubble
Horizon cut-off in FRW Universe | 18 pages, 12 figures | Chinese Journal of Physics (2022) | 10.1016/j.cjph.2022.06.028 | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | In the present work, we investigate the power-law entropy corrected
holographic dark energy (PLECHDE) model with Hubble horizon cutoff. We use 46
observational Hubble data points in the redshift range $0 \leq z \leq 2.36$ to
determine the present Hubble constant $H_0$ and the model parameter $n$. It
represents a phas... | [
{
"created": "Sun, 3 Jul 2022 06:56:42 GMT",
"version": "v1"
}
] | 2022-07-05 | [
[
"Bhardwaj",
"Vinod Kumar",
""
],
[
"Garg",
"Priyanka",
""
],
[
"Pradhan",
"Anirudh",
""
],
[
"Krishnannair",
"Syamala",
""
]
] | In the present work, we investigate the power-law entropy corrected holographic dark energy (PLECHDE) model with Hubble horizon cutoff. We use 46 observational Hubble data points in the redshift range $0 \leq z \leq 2.36$ to determine the present Hubble constant $H_0$ and the model parameter $n$. It represents a phase ... |
1805.05665 | Elias C. Vagenas | Saurya Das, Mir Faizal, Elias C. Vagenas | Renormalizing gravity: a new insight into an old problem | This essay received an honorable mention in the 2018 Gravity Research
Foundation Essay Competition on Gravitation; v2: change of counting of d.o.f.
from (3+1) to (d+1) spacetime dimensions, references updated | Int.J.Mod.Phys. D27 (2018) 1847002 | 10.1142/S0218271818470028 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well-known that perturbative quantum gravity is non-renormalizable. The
metric or vierbein has generally been used as the variable to quantize in
perturbative quantum gravity. In this essay, we show that one can use the spin
connection instead, in which case it is possible to obtain a ghost-free
renormalizable ... | [
{
"created": "Tue, 15 May 2018 09:37:27 GMT",
"version": "v1"
},
{
"created": "Sun, 27 May 2018 19:13:44 GMT",
"version": "v2"
},
{
"created": "Thu, 19 Jul 2018 14:31:46 GMT",
"version": "v3"
}
] | 2018-07-20 | [
[
"Das",
"Saurya",
""
],
[
"Faizal",
"Mir",
""
],
[
"Vagenas",
"Elias C.",
""
]
] | It is well-known that perturbative quantum gravity is non-renormalizable. The metric or vierbein has generally been used as the variable to quantize in perturbative quantum gravity. In this essay, we show that one can use the spin connection instead, in which case it is possible to obtain a ghost-free renormalizable th... |
gr-qc/9302033 | Charles Torre | C. G. Torre and I. M. Anderson | Symmetries of the Einstein Equations | 15 pages, FTG-114-USU, Plain TeX | Phys.Rev.Lett. 70 (1993) 3525-3529 | 10.1103/PhysRevLett.70.3525 | null | gr-qc | null | Generalized symmetries of the Einstein equations are infinitesimal
transformations of the spacetime metric that formally map solutions of the
Einstein equations to other solutions. The infinitesimal generators of these
symmetries are assumed to be local, \ie at a given spacetime point they are
functions of the metric... | [
{
"created": "Tue, 23 Feb 1993 22:53:10 GMT",
"version": "v1"
}
] | 2009-10-22 | [
[
"Torre",
"C. G.",
""
],
[
"Anderson",
"I. M.",
""
]
] | Generalized symmetries of the Einstein equations are infinitesimal transformations of the spacetime metric that formally map solutions of the Einstein equations to other solutions. The infinitesimal generators of these symmetries are assumed to be local, \ie at a given spacetime point they are functions of the metric a... |
0705.3973 | Jordi Sod-Hoffs | Jordi Sod-Hoffs, Egor D Rodchenko | On the properties of the Ernst-Manko-Ruiz equatorially antisymmetric
solutions | 15 pages, 5 figures, submitted to Classical and Quantum Gravity | Class.Quant.Grav.24:4617-4630,2007 | 10.1088/0264-9381/24/18/004 | null | gr-qc | null | Two new equatorially antisymmetric solutions recently published by Ernst et
al are studied. For both solutions the full set of metric functions is derived
in explicit analytic form and the behavior of the solutions on the symmetry
axis is analyzed. It is shown in particular that two counter-rotating equal
Kerr-Newman... | [
{
"created": "Sun, 27 May 2007 19:06:04 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Sod-Hoffs",
"Jordi",
""
],
[
"Rodchenko",
"Egor D",
""
]
] | Two new equatorially antisymmetric solutions recently published by Ernst et al are studied. For both solutions the full set of metric functions is derived in explicit analytic form and the behavior of the solutions on the symmetry axis is analyzed. It is shown in particular that two counter-rotating equal Kerr-Newman-N... |
1111.0825 | Juhua Chen | Juhua Chen, Hao Liao and Yongjiu Wang | Scattering of Scalar Waves by Schwarzschild Black Hole Immersed in
Magnetic Field | 7 pages, 10 figures. arXiv admin note: substantial text overlap with
arXiv:0707.1156 by other authors | Eur. Phys. J. C 73, 2395(2013) | 10.1140/epjc/s10052-013-2395-9 | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | The magnetic field is one of the most important constituents of the cosmic
space and one of the main sources of the dynamics of interacting matter in the
universe. The astronomical observations imply the existence of a strong
magnetic fields of up to $10^4-10^8G$ near supermassive black holes in the
active galactic n... | [
{
"created": "Thu, 3 Nov 2011 12:57:21 GMT",
"version": "v1"
}
] | 2015-06-03 | [
[
"Chen",
"Juhua",
""
],
[
"Liao",
"Hao",
""
],
[
"Wang",
"Yongjiu",
""
]
] | The magnetic field is one of the most important constituents of the cosmic space and one of the main sources of the dynamics of interacting matter in the universe. The astronomical observations imply the existence of a strong magnetic fields of up to $10^4-10^8G$ near supermassive black holes in the active galactic nuc... |
0807.0315 | Th. M. Nieuwenhuizen | Theo M. Nieuwenhuizen | Supermassive Black Holes as Giant Bose-Einstein Condensates | 6 pages, no figures | Europhys.Lett.83:10008,2008 | 10.1209/0295-5075/83/10008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Schwarzschild metric has a divergent energy density at the horizon, which
motivates a new approach to black holes. If matter is spread uniformly
throughout the interior of a supermassive black hole, with mass $M\sim M_\star=
2.34 10^8M_\odot$, it may arise from a Bose-Einstein condensate of densely
packed H-atoms... | [
{
"created": "Wed, 2 Jul 2008 10:01:11 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Nieuwenhuizen",
"Theo M.",
""
]
] | The Schwarzschild metric has a divergent energy density at the horizon, which motivates a new approach to black holes. If matter is spread uniformly throughout the interior of a supermassive black hole, with mass $M\sim M_\star= 2.34 10^8M_\odot$, it may arise from a Bose-Einstein condensate of densely packed H-atoms. ... |
gr-qc/9301001 | Barnich Glenn | Olivier Coussaert and Marc Henneaux | Bianchi Cosmological Models and Gauge Symmetries | 16 pages, Latex file, ULB-PMIF-92/10 | Class.Quant.Grav.10:1607-1618,1993 | 10.1088/0264-9381/10/8/018 | null | gr-qc | null | We analyze carefully the problem of gauge symmetries for Bianchi models, from
both the geometrical and dynamical points of view. Some of the geometrical
definitions of gauge symmetries (=``homogeneity preserving diffeomorphisms'')
given in the literature do not incorporate the crucial feature that local gauge
transfo... | [
{
"created": "Tue, 5 Jan 1993 14:51:07 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Coussaert",
"Olivier",
""
],
[
"Henneaux",
"Marc",
""
]
] | We analyze carefully the problem of gauge symmetries for Bianchi models, from both the geometrical and dynamical points of view. Some of the geometrical definitions of gauge symmetries (=``homogeneity preserving diffeomorphisms'') given in the literature do not incorporate the crucial feature that local gauge transform... |
1110.1913 | Xue-Mei Deng | Xue-Mei Deng | A Modified Generalized Chaplygin Gas as the Unified Dark Matter-Dark
Energy Revisited | 23 pages,15 figures; Accepted by Brazilian Journal of Physics | Brazilian Journal of Physics, Volume 41, Issue 4-6, pp.
333-348,2011 | 10.1007/s13538-011-0044-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A modified generalized Chaplygin gas (MGCG) is considered as the unified dark
matter-dark energy revisited. The character of MGCG is endued with the dual
role, which behaves as matter at early times and as an quiessence dark energy
at late times. The equation of state for MGCG is
$p=-\alpha\rho/(1+\alpha)-\vartheta(z... | [
{
"created": "Mon, 10 Oct 2011 03:02:07 GMT",
"version": "v1"
}
] | 2013-07-05 | [
[
"Deng",
"Xue-Mei",
""
]
] | A modified generalized Chaplygin gas (MGCG) is considered as the unified dark matter-dark energy revisited. The character of MGCG is endued with the dual role, which behaves as matter at early times and as an quiessence dark energy at late times. The equation of state for MGCG is $p=-\alpha\rho/(1+\alpha)-\vartheta(z)\... |
1710.10011 | Jose Luis Bl\'azquez-Salcedo | Jose Luis Bl\'azquez-Salcedo | Radially Excited AdS$_5$ Black Holes in Einstein--Maxwell--Chern--Simons
Theory | 18 pages, 9 figures, invited paper for the "Entropy" special issue
"Geometry in Thermodynamics II", editor George Ruppeiner | Entropy 2017, 19(10), 567 | 10.3390/e19100567 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the large coupling regime of the 5-dimensional
Einstein--Maxwell--Chern--Simons theory, charged and rotating cohomogeneity-1
black holes form sequences of extremal and non-extremal radially excited
configurations. These asymptotically global Anti-de Sitter (AdS$_5$) black
holes form a discrete set of solutions, ch... | [
{
"created": "Fri, 27 Oct 2017 07:32:51 GMT",
"version": "v1"
}
] | 2017-10-30 | [
[
"Blázquez-Salcedo",
"Jose Luis",
""
]
] | In the large coupling regime of the 5-dimensional Einstein--Maxwell--Chern--Simons theory, charged and rotating cohomogeneity-1 black holes form sequences of extremal and non-extremal radially excited configurations. These asymptotically global Anti-de Sitter (AdS$_5$) black holes form a discrete set of solutions, char... |
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