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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1504.03826 | Anton Galajinsky | Sergei Filyukov and Anton Galajinsky | Self-dual metrics with maximally superintegrable geodesic flows | V2: 11 pages, minor modifications | Phys. Rev. D 91, 104020 (2015) | 10.1103/PhysRevD.91.104020 | null | gr-qc hep-th math-ph math.MP nlin.SI | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A class of self-dual and geodesically complete spacetimes with maximally
superintegrable geodesic flows is constructed by applying the Eisenhart lift to
mechanics in pseudo-Euclidean spacetime of signature (1,1). It is characterized
by the presence of a second rank Killing tensor. Spacetimes of the
ultrahyperbolic si... | [
{
"created": "Wed, 15 Apr 2015 09:01:39 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Apr 2015 06:55:02 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Filyukov",
"Sergei",
""
],
[
"Galajinsky",
"Anton",
""
]
] | A class of self-dual and geodesically complete spacetimes with maximally superintegrable geodesic flows is constructed by applying the Eisenhart lift to mechanics in pseudo-Euclidean spacetime of signature (1,1). It is characterized by the presence of a second rank Killing tensor. Spacetimes of the ultrahyperbolic sign... |
gr-qc/0101035 | Roh Suan Tung | Roh S. Tung | Quasi-Local "Conserved Quantities" | 4 pages, contribution to the proceedings of the 9th Marcel Grossmann
Meeting; typos corrected | null | 10.1142/9789812777386_0322 | null | gr-qc hep-th | null | Using the Noether Charge formulation, we study a perturbation of the
conserved gravitating system. By requiring the boundary term in the variation
of the Hamiltonian to depend only on the symplectic structure, we propose a
general prescription for defining quasi-local ``conserved quantities'' (i.e. in
the situation w... | [
{
"created": "Tue, 9 Jan 2001 23:59:04 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Jan 2001 00:22:37 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Mar 2001 05:45:54 GMT",
"version": "v3"
}
] | 2017-08-23 | [
[
"Tung",
"Roh S.",
""
]
] | Using the Noether Charge formulation, we study a perturbation of the conserved gravitating system. By requiring the boundary term in the variation of the Hamiltonian to depend only on the symplectic structure, we propose a general prescription for defining quasi-local ``conserved quantities'' (i.e. in the situation whe... |
2102.00916 | Amir Hadi Ziaie | Hooman Moradpour, Sara Aghababaei, Amir Hadi Ziaie | A Note on Effects of Generalized and Extended Uncertainty Principles on
J\"{u}ttner Gas | null | Symmetry 2021, 13(2), 213 | 10.3390/sym13020213 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In recent years, the implications of the generalized (GUP) and extended (EUP)
uncertainty prin-ciples on Maxwell-Boltzmann distribution have been widely
investigated. However, at high energy regimes, the validity of
Maxwell-Boltzmann statistics is under debate and instead, the J\"{u}ttner
distribution is proposed as ... | [
{
"created": "Fri, 29 Jan 2021 06:58:11 GMT",
"version": "v1"
}
] | 2021-02-02 | [
[
"Moradpour",
"Hooman",
""
],
[
"Aghababaei",
"Sara",
""
],
[
"Ziaie",
"Amir Hadi",
""
]
] | In recent years, the implications of the generalized (GUP) and extended (EUP) uncertainty prin-ciples on Maxwell-Boltzmann distribution have been widely investigated. However, at high energy regimes, the validity of Maxwell-Boltzmann statistics is under debate and instead, the J\"{u}ttner distribution is proposed as th... |
0910.0424 | Jose Carlos de Araujo | J. C. N. de Araujo and G. F. Marranghello | Gravitational wave background from neutron star phase transition | 17 pages, 5 figures | General Relativity and Gravitation, 41, 1389 (2009) | 10.1007/s10714-008-0712-7 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the generation of a stochastic gravitational wave (GW) background
produced by a population of neutron stars (NSs) which go over a hadron-quark
phase transition in its inner shells. We obtain, for example, that the NS phase
transition, in cold dark matter scenarios, could generate a stochastic GW
background w... | [
{
"created": "Fri, 2 Oct 2009 15:31:05 GMT",
"version": "v1"
}
] | 2009-10-05 | [
[
"de Araujo",
"J. C. N.",
""
],
[
"Marranghello",
"G. F.",
""
]
] | We study the generation of a stochastic gravitational wave (GW) background produced by a population of neutron stars (NSs) which go over a hadron-quark phase transition in its inner shells. We obtain, for example, that the NS phase transition, in cold dark matter scenarios, could generate a stochastic GW background wit... |
gr-qc/0507087 | Salvatore Capozziello | S. Capozziello, S. De Martino, S. I. Tzenov | Hydrodynamic covariant symplectic structure from bilinear Hamiltonian
functions | 9 pages, no figure. to appear in Progress in Physics | null | null | null | gr-qc | null | Starting from generic bilinear Hamiltonians, constructed by covariant vector,
bivector or tensor fields, it is possible to derive a general symplectic
structure which leads to holonomic and anholonomic formulations of Hamilton
equations of motion directly related to a hydrodynamic picture. This feature is
gauge free ... | [
{
"created": "Wed, 20 Jul 2005 15:14:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Capozziello",
"S.",
""
],
[
"De Martino",
"S.",
""
],
[
"Tzenov",
"S. I.",
""
]
] | Starting from generic bilinear Hamiltonians, constructed by covariant vector, bivector or tensor fields, it is possible to derive a general symplectic structure which leads to holonomic and anholonomic formulations of Hamilton equations of motion directly related to a hydrodynamic picture. This feature is gauge free an... |
1707.02541 | Lorenzo Reverberi | Elena V. Arbuzova, Alexander D. Dolgov and Lorenzo Reverberi | Cosmic ray production in modified gravity | In response to criticism by referees several clarifying comments are
added. The results of the paper remain largely unchanged. Version to appear
on EPJC | null | 10.1140/epjc/s10052-018-5968-9 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is a reply to the criticism of our work on particle production in
modified gravity by D. Gorbunov and A. Tokareva. We show that their arguments
against efficient particle production are invalid. $F(R)$ theories can lead to
an efficient generation of high energy cosmic rays in contracting systems.
| [
{
"created": "Sun, 9 Jul 2017 08:17:14 GMT",
"version": "v1"
},
{
"created": "Thu, 31 May 2018 21:56:18 GMT",
"version": "v2"
}
] | 2018-07-04 | [
[
"Arbuzova",
"Elena V.",
""
],
[
"Dolgov",
"Alexander D.",
""
],
[
"Reverberi",
"Lorenzo",
""
]
] | This paper is a reply to the criticism of our work on particle production in modified gravity by D. Gorbunov and A. Tokareva. We show that their arguments against efficient particle production are invalid. $F(R)$ theories can lead to an efficient generation of high energy cosmic rays in contracting systems. |
1903.11998 | Subhra Bhattacharya | Shibaji Halder, Subhra Bhattacharya, Subenoy Chakraborty | Wormhole Solutions in Rastall Gravity Theory | Accepted in Mod. Phys. Lett. A | null | 10.1142/S0217732319500950 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The present work looks for new wormhole solutions in the non conservative
Rastall gravity. Although Rastall gravity is considered to be a higher
dimensional gravity, the actual diversion from general relativity essentially
happens due to a modification in the corresponding matter tensor part. Thus it
would be interes... | [
{
"created": "Thu, 28 Feb 2019 06:26:16 GMT",
"version": "v1"
}
] | 2019-03-29 | [
[
"Halder",
"Shibaji",
""
],
[
"Bhattacharya",
"Subhra",
""
],
[
"Chakraborty",
"Subenoy",
""
]
] | The present work looks for new wormhole solutions in the non conservative Rastall gravity. Although Rastall gravity is considered to be a higher dimensional gravity, the actual diversion from general relativity essentially happens due to a modification in the corresponding matter tensor part. Thus it would be interesti... |
gr-qc/9807022 | Piero Cipriani | Maria Di Bari and Piero Cipriani | The (In)stability of Bianchi IX Dynamics: Geodesic Deviation Equations
in Finsler Spaces | 4 pages plus 3 ps figures included. Submitted to PRL | In "Chaotic Universe" p.499 - World Scientific (2000) | null | null | gr-qc astro-ph math-ph math.MP nlin.CD | null | We explore the dynamical stability of the minisuperspace Hamiltonian of the
Bianchi IX cosmological models, giving a gauge-invariant and unapproximated
description of the full continuous dynamics, achieved through a geometrical
description of the equations of motion in the framework of the theory of
Finsler Spaces. T... | [
{
"created": "Thu, 9 Jul 1998 14:36:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Di Bari",
"Maria",
""
],
[
"Cipriani",
"Piero",
""
]
] | We explore the dynamical stability of the minisuperspace Hamiltonian of the Bianchi IX cosmological models, giving a gauge-invariant and unapproximated description of the full continuous dynamics, achieved through a geometrical description of the equations of motion in the framework of the theory of Finsler Spaces. The... |
1405.0581 | Eugeny Babichev | Eugeny Babichev and Alessandro Fabbri | A class of charged black hole solutions in massive (bi)gravity | 7 pages, v3: references added, typos corrected, matches published
version | JHEP 07 (2014) 016 | 10.1007/JHEP07(2014)016 | LPT-Orsay-14-42 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a new class of solutions describing charged black holes in massive
(bi)gravity. For a generic choice of the parameters of the massive gravity
action, the solution is the Reissner-Nordstrom-de Sitter metric written in the
Eddington-Finkelstein coordinates for both metrics. We also study a special
case of th... | [
{
"created": "Sat, 3 May 2014 13:00:02 GMT",
"version": "v1"
},
{
"created": "Wed, 14 May 2014 15:46:12 GMT",
"version": "v2"
},
{
"created": "Tue, 8 Jul 2014 14:08:49 GMT",
"version": "v3"
}
] | 2014-07-09 | [
[
"Babichev",
"Eugeny",
""
],
[
"Fabbri",
"Alessandro",
""
]
] | We present a new class of solutions describing charged black holes in massive (bi)gravity. For a generic choice of the parameters of the massive gravity action, the solution is the Reissner-Nordstrom-de Sitter metric written in the Eddington-Finkelstein coordinates for both metrics. We also study a special case of the ... |
1002.4783 | Mariam Bouhmadi-Lopez | Mariam Bouhmadi-Lopez, Claus Kiefer, Barbara Sandhoefer, Paulo Vargas
Moniz | Defrosting the Big Freeze quantum mechanically? | 3 pages. To appear in the proceedings of 12th Marcel Grossmann
Meeting, Paris (France) | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The big freeze is a singularity that shows up in some dark energy models. We
address here its possible avoidance in quantum cosmology, more precisely in the
framework of quantum geometrodynamics.
| [
{
"created": "Thu, 25 Feb 2010 13:32:22 GMT",
"version": "v1"
}
] | 2010-02-26 | [
[
"Bouhmadi-Lopez",
"Mariam",
""
],
[
"Kiefer",
"Claus",
""
],
[
"Sandhoefer",
"Barbara",
""
],
[
"Moniz",
"Paulo Vargas",
""
]
] | The big freeze is a singularity that shows up in some dark energy models. We address here its possible avoidance in quantum cosmology, more precisely in the framework of quantum geometrodynamics. |
1606.04846 | Subhajit Saha | Subhajit Saha | Cosmological thermodynamics with Hawking temperature on the apparent
horizon and Unruh temperature of the fluid: Some interesting consequences | 6 pages; v2: Typos corrected, Identical to published version | Europhysics Letters 114, 59001 (2016) | 10.1209/0295-5075/114/59001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Thermodynamics on the cosmological apparent horizon of a flat
Friedmann-Lemaitre-Robertson-Walker metric has been investigated with
Bekenstein entropy and Hawking temperature on the horizon, and Unruh
temperature for the fluid inside the horizon. This temperature is experienced
by a radial comoving observer infinites... | [
{
"created": "Wed, 8 Jun 2016 04:00:50 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2016 08:16:54 GMT",
"version": "v2"
}
] | 2016-07-15 | [
[
"Saha",
"Subhajit",
""
]
] | Thermodynamics on the cosmological apparent horizon of a flat Friedmann-Lemaitre-Robertson-Walker metric has been investigated with Bekenstein entropy and Hawking temperature on the horizon, and Unruh temperature for the fluid inside the horizon. This temperature is experienced by a radial comoving observer infinitesim... |
2304.11185 | Francois Larrouturou | Luc Blanchet, Guillaume Faye, Quentin Henry, Fran\c{c}ois Larrouturou
and David Trestini | Gravitational-Wave Phasing of Quasi-Circular Compact Binary Systems to
the Fourth-and-a-Half post-Newtonian Order | 9 pages, 1 table. v2: reference of the companion paper updated. v3:
post-referee version, typo corrected in Eq. (9). v4: bibliographic typo
corrected | Phys. Rev. Lett. 131, 121402 (2023) | 10.1103/PhysRevLett.131.121402 | DESY-23-043 | gr-qc astro-ph.CO astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | The inspiral phase of gravitational waves emitted by spinless compact binary
systems is derived through the fourth-and-a-half post-Newtonian (4.5PN) order
beyond quadrupole radiation, and the leading amplitude mode ($\ell$, m) = (2,
2) is obtained at 4PN order. We also provide the radiated flux, as well as the
phase ... | [
{
"created": "Fri, 21 Apr 2023 18:00:06 GMT",
"version": "v1"
},
{
"created": "Tue, 25 Apr 2023 06:58:29 GMT",
"version": "v2"
},
{
"created": "Thu, 29 Jun 2023 16:46:40 GMT",
"version": "v3"
},
{
"created": "Sat, 30 Sep 2023 10:43:34 GMT",
"version": "v4"
}
] | 2023-10-03 | [
[
"Blanchet",
"Luc",
""
],
[
"Faye",
"Guillaume",
""
],
[
"Henry",
"Quentin",
""
],
[
"Larrouturou",
"François",
""
],
[
"Trestini",
"David",
""
]
] | The inspiral phase of gravitational waves emitted by spinless compact binary systems is derived through the fourth-and-a-half post-Newtonian (4.5PN) order beyond quadrupole radiation, and the leading amplitude mode ($\ell$, m) = (2, 2) is obtained at 4PN order. We also provide the radiated flux, as well as the phase in... |
2306.12888 | Igor Bogush M.Sc. | Igor Bogush, Kirill Kobialko, Dmitri Gal'tsov | Glued massive particles surfaces | 39 pages, revtex4 | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A novel generalization of photon surfaces to the case of massive charged
particles is given for spacetimes with at least one isometry, including
stationary ones. A related notion of glued massive particle surfaces is also
defined. These surfaces join worldlines parametrized by a family of independent
conserved quanti... | [
{
"created": "Thu, 22 Jun 2023 13:54:43 GMT",
"version": "v1"
}
] | 2023-06-23 | [
[
"Bogush",
"Igor",
""
],
[
"Kobialko",
"Kirill",
""
],
[
"Gal'tsov",
"Dmitri",
""
]
] | A novel generalization of photon surfaces to the case of massive charged particles is given for spacetimes with at least one isometry, including stationary ones. A related notion of glued massive particle surfaces is also defined. These surfaces join worldlines parametrized by a family of independent conserved quantiti... |
1704.06573 | Takeshi Chiba | Takeshi Chiba and Shuichiro Yokoyama | Spin Distribution of Primordial Black Holes | 12 pages, 2 figures, references added, version to appear in PTEP | PTEP 2017 8, 083E01 (2017) | 10.1093/ptep/ptx087 | RUP-17-5 | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We estimate the spin distribution of primordial black holes based on the
recent study of the critical phenomena in the gravitational collapse of a
rotating radiation fluid. We find that primordial black holes are mostly slowly
rotating.
| [
{
"created": "Thu, 20 Apr 2017 00:41:54 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jun 2017 00:17:42 GMT",
"version": "v2"
}
] | 2017-08-11 | [
[
"Chiba",
"Takeshi",
""
],
[
"Yokoyama",
"Shuichiro",
""
]
] | We estimate the spin distribution of primordial black holes based on the recent study of the critical phenomena in the gravitational collapse of a rotating radiation fluid. We find that primordial black holes are mostly slowly rotating. |
2202.03731 | Masahiro Hotta | Masahiro Hotta, Yasusada Nambu, Yuuki Sugiyama, Kazuhiro Yamamoto, Go
Yusa | Expanding Edges of Quantum Hall Systems in a Cosmology Language --
Hawking Radiation from de Sitter Horizon in Edge Modes | A subtitle and arguments about Hawking radiation in de Sitter space
are added | null | 10.1103/PhysRevD.105.105009 | null | gr-qc cond-mat.mes-hall hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | Expanding edge experiments are promising to open new physics windows of
quantum Hall systems. In a static edge, the edge excitation, which is described
by free fields decoupled with the bulk dynamics, is gapless, and the dynamics
preserve conformal symmetry. When the edge expands, such properties need not be
preserve... | [
{
"created": "Tue, 8 Feb 2022 09:14:33 GMT",
"version": "v1"
},
{
"created": "Thu, 7 Apr 2022 19:50:37 GMT",
"version": "v2"
}
] | 2022-05-25 | [
[
"Hotta",
"Masahiro",
""
],
[
"Nambu",
"Yasusada",
""
],
[
"Sugiyama",
"Yuuki",
""
],
[
"Yamamoto",
"Kazuhiro",
""
],
[
"Yusa",
"Go",
""
]
] | Expanding edge experiments are promising to open new physics windows of quantum Hall systems. In a static edge, the edge excitation, which is described by free fields decoupled with the bulk dynamics, is gapless, and the dynamics preserve conformal symmetry. When the edge expands, such properties need not be preserved.... |
2304.08255 | Diego S\'aez-Chill\'on G\'omez | Shin'ichi Nojiri, Sergei D. Odintsov and Diego S\'aez-Chill\'on
G\'omez | Unifying inflation with early and late dark energy in
Einstein-Gauss-Bonnet gravity | 13 pages. Version accepted for publication in Phys. Dark Universe | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the era of precision cosmology, different observational data has led to
precise measurements of the Hubble constant that differ significantly, what has
been called the Hubble tension problem. In order to solve such a discrepancy,
many different solutions have been proposed, from systematic errors on the
observatio... | [
{
"created": "Mon, 17 Apr 2023 13:16:43 GMT",
"version": "v1"
}
] | 2023-04-18 | [
[
"Nojiri",
"Shin'ichi",
""
],
[
"Odintsov",
"Sergei D.",
""
],
[
"Gómez",
"Diego Sáez-Chillón",
""
]
] | In the era of precision cosmology, different observational data has led to precise measurements of the Hubble constant that differ significantly, what has been called the Hubble tension problem. In order to solve such a discrepancy, many different solutions have been proposed, from systematic errors on the observationa... |
2305.02222 | Mikhail Katanaev | M. O. Katanaev | Complete separation of variables in the geodesic Hamilton-Jacobi
equation | 52 pages, proofs are simplified | null | null | null | gr-qc math-ph math.MP | http://creativecommons.org/publicdomain/zero/1.0/ | We consider a (pseudo)Riemannian manifold of arbitrary dimension. The
Hamilton-Jacobi equation for geodesic Hamiltonian admits complete separation of
variables for some (separable) metrics in some (separable) coordinate systems.
Separable metrics are very important in mathematics and physics. The St\"ackel
problem is... | [
{
"created": "Wed, 26 Apr 2023 15:21:52 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Nov 2023 13:29:04 GMT",
"version": "v2"
}
] | 2023-11-22 | [
[
"Katanaev",
"M. O.",
""
]
] | We consider a (pseudo)Riemannian manifold of arbitrary dimension. The Hamilton-Jacobi equation for geodesic Hamiltonian admits complete separation of variables for some (separable) metrics in some (separable) coordinate systems. Separable metrics are very important in mathematics and physics. The St\"ackel problem is: ... |
gr-qc/0601094 | Frances White | Frances White | A quasi-Kinnersley tetrad for the quasi-Kerr metric | Improved discussion of residual type III freedom and correction to
equation (6), now equation (5) | null | null | null | gr-qc | null | Explicit expressions for the quasi-Kinnersley tetrad for the quasi-Kerr
metric are given. These provide a very clear and simple example of the
quasi-Kinnersley tetrad, and may be useful in the future development of a
`quasi-Teukolsky' scheme for the analysis of perturbation equations in
spacetimes which are Petrov ty... | [
{
"created": "Mon, 23 Jan 2006 16:30:54 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jun 2006 14:02:35 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"White",
"Frances",
""
]
] | Explicit expressions for the quasi-Kinnersley tetrad for the quasi-Kerr metric are given. These provide a very clear and simple example of the quasi-Kinnersley tetrad, and may be useful in the future development of a `quasi-Teukolsky' scheme for the analysis of perturbation equations in spacetimes which are Petrov type... |
gr-qc/0209109 | Ignazio Ciufolini | Ignazio Ciufolini | Test of general relativity: 1995-2002 measurement of frame-dragging | 12 pages, 2 figures | eConf C020620 (2002) FRAT03 | null | null | gr-qc | null | After an introduction on phenomena due to spin and mass-energy currents on
clocks and photons, we review the 1995-2001 measurements of the gravitomagnetic
field of Earth and Lense-Thirring effect obtained by analyzing the orbits of
the two laser-ranged satellites LAGEOS and LAGEOS II; this method has provided
a direc... | [
{
"created": "Sun, 29 Sep 2002 09:56:31 GMT",
"version": "v1"
},
{
"created": "Tue, 1 Oct 2002 00:23:44 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Ciufolini",
"Ignazio",
""
]
] | After an introduction on phenomena due to spin and mass-energy currents on clocks and photons, we review the 1995-2001 measurements of the gravitomagnetic field of Earth and Lense-Thirring effect obtained by analyzing the orbits of the two laser-ranged satellites LAGEOS and LAGEOS II; this method has provided a direct ... |
2406.01397 | Timothy Clifton | Chad Briddon, Timothy Clifton, Pierre Fleury | Emergent Cosmological Expansion in Scalar-Tensor Theories of Gravity | 15 pages, 4 figures | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the emergence of large-scale cosmological expansion in
scalar-tensor theories of gravity. This is achieved by modelling sub-horizon
regions of space-time as weak-field expansions around Minkowski space, and then
subsequently joining many such regions together to create a statistically
homogeneous and isot... | [
{
"created": "Mon, 3 Jun 2024 14:59:47 GMT",
"version": "v1"
}
] | 2024-06-04 | [
[
"Briddon",
"Chad",
""
],
[
"Clifton",
"Timothy",
""
],
[
"Fleury",
"Pierre",
""
]
] | We consider the emergence of large-scale cosmological expansion in scalar-tensor theories of gravity. This is achieved by modelling sub-horizon regions of space-time as weak-field expansions around Minkowski space, and then subsequently joining many such regions together to create a statistically homogeneous and isotro... |
gr-qc/9610037 | Jonathan Kress | I. M. Benn, Philip Charlton and Jonathan Kress | Debye Potentials for Maxwell and Dirac Fields from a Generalisation of
the Killing-Yano Equation | 35 pages, plain TeX | J.Math.Phys. 38 (1997) 4504-4527 | 10.1063/1.532140 | null | gr-qc | null | By using conformal Killing-Yano tensors, and their generalisations, we obtain
scalar potentials for both the source-free Maxwell and massless Dirac
equations. For each of these equations we construct, from conformal
Killing-Yano tensors, symmetry operators that map any solution to another.
| [
{
"created": "Thu, 17 Oct 1996 02:13:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Benn",
"I. M.",
""
],
[
"Charlton",
"Philip",
""
],
[
"Kress",
"Jonathan",
""
]
] | By using conformal Killing-Yano tensors, and their generalisations, we obtain scalar potentials for both the source-free Maxwell and massless Dirac equations. For each of these equations we construct, from conformal Killing-Yano tensors, symmetry operators that map any solution to another. |
1112.0761 | Salvatore Capozziello | S. Capozziello, M. De Laurentis, I. De Martino, M. Formisano, S.D.
Odintsov | Jeans analysis of self-gravitating systems in f(R)-gravity | 8 pages, 2 figures, Accepted for publication in PRD | null | 10.1103/PhysRevD.85.044022 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Dynamics and collapse of collisionless self-gravitating systems is described
by the coupled collisionless Boltzmann and Poisson equations derived from
$f(R)$-gravity in the weak field approximation. Specifically, we describe a
system at equilibrium by a time-independent distribution function $f_0(x,v)$
and two potent... | [
{
"created": "Sun, 4 Dec 2011 15:42:59 GMT",
"version": "v1"
},
{
"created": "Thu, 26 Jan 2012 07:42:01 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Capozziello",
"S.",
""
],
[
"De Laurentis",
"M.",
""
],
[
"De Martino",
"I.",
""
],
[
"Formisano",
"M.",
""
],
[
"Odintsov",
"S. D.",
""
]
] | Dynamics and collapse of collisionless self-gravitating systems is described by the coupled collisionless Boltzmann and Poisson equations derived from $f(R)$-gravity in the weak field approximation. Specifically, we describe a system at equilibrium by a time-independent distribution function $f_0(x,v)$ and two potentia... |
1911.11614 | Vladimir Folomeev | Vladimir Dzhunushaliev, Vladimir Folomeev | Dirac star with SU(2) Yang-Mills and Proca fields | 10 pages, 6 figures, some corrections to content, new references
added, version published in PRD. arXiv admin note: substantial text overlap
with arXiv:1901.09905 | Phys. Rev. D 101, 024023 (2020) | 10.1103/PhysRevD.101.024023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study spherically symmetric strongly gravitating configurations supported
by nonlinear spinor fields and non-Abelian SU(2) Yang-Mills/Proca magnetic
fields. Regular asymptotically flat solutions describing objects with positive
Arnowitt-Deser-Misner masses are obtained numerically. When the mass of the
spinor fiel... | [
{
"created": "Sat, 23 Nov 2019 06:14:08 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Jan 2020 04:46:19 GMT",
"version": "v2"
}
] | 2020-01-13 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Folomeev",
"Vladimir",
""
]
] | We study spherically symmetric strongly gravitating configurations supported by nonlinear spinor fields and non-Abelian SU(2) Yang-Mills/Proca magnetic fields. Regular asymptotically flat solutions describing objects with positive Arnowitt-Deser-Misner masses are obtained numerically. When the mass of the spinor fields... |
2004.13751 | Antonino Marciano | Andrea Addazi, Pisin Chen, Filippo Fabrocini, Chris Fields, Enrico
Greco, Matteo Lulli, Antonino Marciano and Roman Pasechnik | Generalized Holographic Principle, Gauge Invariance and the Emergence of
Gravity a la Wilczek | 26 pages, 1 figure | null | null | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that a generalized version of the holographic principle can be
derived from the Hamiltonian description of information flow within a quantum
system that maintains a separable state. We then show that this generalized
holographic principle entails a general principle of gauge invariance. When
this is realized ... | [
{
"created": "Tue, 28 Apr 2020 18:00:32 GMT",
"version": "v1"
}
] | 2020-04-30 | [
[
"Addazi",
"Andrea",
""
],
[
"Chen",
"Pisin",
""
],
[
"Fabrocini",
"Filippo",
""
],
[
"Fields",
"Chris",
""
],
[
"Greco",
"Enrico",
""
],
[
"Lulli",
"Matteo",
""
],
[
"Marciano",
"Antonino",
""
],
[
... | We show that a generalized version of the holographic principle can be derived from the Hamiltonian description of information flow within a quantum system that maintains a separable state. We then show that this generalized holographic principle entails a general principle of gauge invariance. When this is realized in... |
2401.14329 | Serena Valtolina | Bruce Allen and Serena Valtolina | Pulsar timing array source ensembles | Final published version | Phys. Rev. D 109, 083038 (2024) | 10.1103/PhysRevD.109.083038 | null | gr-qc astro-ph.CO astro-ph.HE | http://creativecommons.org/publicdomain/zero/1.0/ | The stochastic gravitational wave background for pulsar timing arrays is
often modeled by a Gaussian ensemble which is isotropic and unpolarized.
However, the Universe has a discrete set of polarized gravitational wave
sources at specific sky locations. Can we trust that the Gaussian ensemble is
an accurate descripti... | [
{
"created": "Thu, 25 Jan 2024 17:27:18 GMT",
"version": "v1"
},
{
"created": "Wed, 1 May 2024 07:11:09 GMT",
"version": "v2"
}
] | 2024-05-02 | [
[
"Allen",
"Bruce",
""
],
[
"Valtolina",
"Serena",
""
]
] | The stochastic gravitational wave background for pulsar timing arrays is often modeled by a Gaussian ensemble which is isotropic and unpolarized. However, the Universe has a discrete set of polarized gravitational wave sources at specific sky locations. Can we trust that the Gaussian ensemble is an accurate description... |
gr-qc/0408015 | Patricio S. Letelier | Jose D. Polanco, Patricio S. Letelier and Maximiliano Ujevic | Space-Time geometry and thermodynamic properties of a self-gravitating
ball of fluid in phase transition | RevTex 9 pages. Phys. Rev. D, in press | Phys.Rev. D70 (2004) 064006 | 10.1103/PhysRevD.70.064006 | null | gr-qc astro-ph | null | A numerical solution of Einstein field equations for a spherical symmetric
and stationary system of identical and auto-gravitating particles in phase
transition is presented. The fluid possess a perfect fluid energy momentum
tensor, and the internal interactions of the system are represented by a van
der Walls like e... | [
{
"created": "Thu, 5 Aug 2004 18:35:28 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Polanco",
"Jose D.",
""
],
[
"Letelier",
"Patricio S.",
""
],
[
"Ujevic",
"Maximiliano",
""
]
] | A numerical solution of Einstein field equations for a spherical symmetric and stationary system of identical and auto-gravitating particles in phase transition is presented. The fluid possess a perfect fluid energy momentum tensor, and the internal interactions of the system are represented by a van der Walls like equ... |
2210.05686 | Maximilian Dax | Maximilian Dax, Stephen R. Green, Jonathan Gair, Michael P\"urrer,
Jonas Wildberger, Jakob H. Macke, Alessandra Buonanno, Bernhard Sch\"olkopf | Neural Importance Sampling for Rapid and Reliable Gravitational-Wave
Inference | 8+7 pages, 1+5 figures. [v2]: Minor updates to match published
version, code available at https://github.com/dingo-gw/dingo | Phys. Rev. Lett. 130, 171403 (2023) | 10.1103/PhysRevLett.130.171403 | LIGO-P2200297 | gr-qc astro-ph.IM cs.LG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We combine amortized neural posterior estimation with importance sampling for
fast and accurate gravitational-wave inference. We first generate a rapid
proposal for the Bayesian posterior using neural networks, and then attach
importance weights based on the underlying likelihood and prior. This provides
(1) a correc... | [
{
"created": "Tue, 11 Oct 2022 18:00:02 GMT",
"version": "v1"
},
{
"created": "Tue, 30 May 2023 13:21:07 GMT",
"version": "v2"
}
] | 2023-05-31 | [
[
"Dax",
"Maximilian",
""
],
[
"Green",
"Stephen R.",
""
],
[
"Gair",
"Jonathan",
""
],
[
"Pürrer",
"Michael",
""
],
[
"Wildberger",
"Jonas",
""
],
[
"Macke",
"Jakob H.",
""
],
[
"Buonanno",
"Alessandra",
""
... | We combine amortized neural posterior estimation with importance sampling for fast and accurate gravitational-wave inference. We first generate a rapid proposal for the Bayesian posterior using neural networks, and then attach importance weights based on the underlying likelihood and prior. This provides (1) a correcte... |
2007.11677 | Francisco Fern\'andez-\'Alvarez | Francisco Fern\'andez-\'Alvarez and Jos\'e M. M. Senovilla | Gravitational radiation condition at infinity with a positive
cosmological constant | 11 pages, 1 figure added, new section added, other minor changes | Phys. Rev. D 102, 101502 (2020) | 10.1103/PhysRevD.102.101502 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves have been directly detected and astronomical observations
indicate that our Universe has a positive cosmological constant $\Lambda$.
Nevertheless, a theoretical gauge-invariant notion of gravitational waves
arriving at infinity (escaping from the space-time) in the presence of a
positive $\Lambda$... | [
{
"created": "Wed, 22 Jul 2020 21:04:44 GMT",
"version": "v1"
},
{
"created": "Thu, 30 Jul 2020 07:10:43 GMT",
"version": "v2"
},
{
"created": "Mon, 16 Nov 2020 08:16:09 GMT",
"version": "v3"
}
] | 2020-11-18 | [
[
"Fernández-Álvarez",
"Francisco",
""
],
[
"Senovilla",
"José M. M.",
""
]
] | Gravitational waves have been directly detected and astronomical observations indicate that our Universe has a positive cosmological constant $\Lambda$. Nevertheless, a theoretical gauge-invariant notion of gravitational waves arriving at infinity (escaping from the space-time) in the presence of a positive $\Lambda$ h... |
1412.7278 | Carlos A. R. Herdeiro | Carolina L. Benone, Luis C. B. Crispino, Carlos Herdeiro, Eugen Radu | Acoustic clouds: standing sound waves around a black hole analogue | 8 pages, 6 figures; v2. 11 pages, 8 figures, included analysis with
Neumann boundary conditions and added more references | Phys. Rev. D 91, 104038 (2015) | 10.1103/PhysRevD.91.104038 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Under certain conditions sound waves in fluids experience an acoustic horizon
with analogue properties to those of a black hole event horizon. In particular,
a draining bathtub-like model can give rise to a rotating acoustic horizon and
hence a rotating black hole (acoustic) analogue. We show that sound waves, when
e... | [
{
"created": "Tue, 23 Dec 2014 07:49:22 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jan 2015 15:30:28 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Benone",
"Carolina L.",
""
],
[
"Crispino",
"Luis C. B.",
""
],
[
"Herdeiro",
"Carlos",
""
],
[
"Radu",
"Eugen",
""
]
] | Under certain conditions sound waves in fluids experience an acoustic horizon with analogue properties to those of a black hole event horizon. In particular, a draining bathtub-like model can give rise to a rotating acoustic horizon and hence a rotating black hole (acoustic) analogue. We show that sound waves, when enc... |
0807.3983 | Kazuhiro Hayama | Kazuhiro Hayama, Shantanu Desai, Soumya D. Mohanty, Malik Rakhmanov,
Tiffany Summerscales, Sanichiro Yoshida | Searches for gravitational waves associated with pulsar glitches using a
coherent network algorithm | submitted to CQG | Class.Quant.Grav.25:184016,2008 | 10.1088/0264-9381/25/18/184016 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Pulsar glitches are a potential source of gravitational waves for current and
future interferometric gravitational wave detectors. Some pulsar glitch events
were observed by radio and X-ray telescopes during the fifth LIGO science run.
It is expected that glitches from these same pulsars should also be seen in the
fu... | [
{
"created": "Fri, 25 Jul 2008 00:05:47 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Hayama",
"Kazuhiro",
""
],
[
"Desai",
"Shantanu",
""
],
[
"Mohanty",
"Soumya D.",
""
],
[
"Rakhmanov",
"Malik",
""
],
[
"Summerscales",
"Tiffany",
""
],
[
"Yoshida",
"Sanichiro",
""
]
] | Pulsar glitches are a potential source of gravitational waves for current and future interferometric gravitational wave detectors. Some pulsar glitch events were observed by radio and X-ray telescopes during the fifth LIGO science run. It is expected that glitches from these same pulsars should also be seen in the futu... |
1702.07824 | German Lugones | Germ\'an Lugones and Jos\'e D. V. Arba\~nil | Compact stars in the braneworld: a new branch of stellar configurations
with arbitrarily large mass | to appear in Physical Review D | Phys. Rev. D 95, 064022 (2017) | 10.1103/PhysRevD.95.064022 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the properties of compact stars in the Randall-Sundrum II type
braneworld model. To this end, we solve the braneworld generalization of the
stellar structure equations for a static fluid distribution with spherical
symmetry considering that the spacetime outside the star is described by a
Schwarzschild metri... | [
{
"created": "Sat, 25 Feb 2017 03:05:16 GMT",
"version": "v1"
}
] | 2017-09-01 | [
[
"Lugones",
"Germán",
""
],
[
"Arbañil",
"José D. V.",
""
]
] | We study the properties of compact stars in the Randall-Sundrum II type braneworld model. To this end, we solve the braneworld generalization of the stellar structure equations for a static fluid distribution with spherical symmetry considering that the spacetime outside the star is described by a Schwarzschild metric.... |
1303.0949 | Yi Xie | Xue-Mei Deng and Yi Xie | Yukawa effects on the clock onboard a drag-free satellite | 4 pages, 2 figures, accepted for publication in MNRAS | MNRAS (June 1, 2013) 431 (4): 3236-3239 | 10.1093/mnras/stt404 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Yukawa correction to the Newtonian gravitational force is accepted as a
parameterization of deviations from the inverse-square law of gravity which
might be caused by new physics beyond the standard model of particles and the
general theory of relativity. We investigate these effects on the clock onboard
a drag-f... | [
{
"created": "Tue, 5 Mar 2013 07:09:17 GMT",
"version": "v1"
}
] | 2013-07-05 | [
[
"Deng",
"Xue-Mei",
""
],
[
"Xie",
"Yi",
""
]
] | The Yukawa correction to the Newtonian gravitational force is accepted as a parameterization of deviations from the inverse-square law of gravity which might be caused by new physics beyond the standard model of particles and the general theory of relativity. We investigate these effects on the clock onboard a drag-fre... |
gr-qc/9409050 | Philip Mannheim | Philip D. Mannheim (University of Connecticut) and Demosthenes Kazanas
(NASA/Goddard Space Flight Center) | Higgs Mechanism and the Structure of the Energy-Momentum Tensor in
Einstein Gravity and Conformal Gravity | UCONN-94-7, plain TeX, 3 pages. To appear in the proceedings of the
Seventh Marcel Grossmann Meeting on General Relativity | null | null | null | gr-qc | null | In the standard treatment of the Einstein gravitational theory the
energy-momentum tensor has always been taken to be composed of perfect fluid
aggregates of kinematic Newtonian point test particles with fundamental
mechanical masses. Moreover, this standard prescription was not revised after
the discovery of the mas... | [
{
"created": "Fri, 23 Sep 1994 15:21:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mannheim",
"Philip D.",
"",
"University of Connecticut"
],
[
"Kazanas",
"Demosthenes",
"",
"NASA/Goddard Space Flight Center"
]
] | In the standard treatment of the Einstein gravitational theory the energy-momentum tensor has always been taken to be composed of perfect fluid aggregates of kinematic Newtonian point test particles with fundamental mechanical masses. Moreover, this standard prescription was not revised after the discovery of the mass-... |
1205.5506 | Tapas Kumar Das | Neven Bilic, Arpita Choudhary, Tapas K Das, and Sankhasubhra Nag | The role of axisymmetric flow configuration in the estimation of the
analogue surface gravity and related Hawking like temperature | 26 pages. 6 figures | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | For axially symmetric flow of dissipationless inhomogeneous fluid onto a non
rotating astrophysical black hole under the influence of a generalized
pseudo-Schwarzschild gravitational potential, we investigate the influence of
the background flow configuration on determining the salient features of the
corresponding a... | [
{
"created": "Thu, 24 May 2012 17:14:22 GMT",
"version": "v1"
}
] | 2015-03-20 | [
[
"Bilic",
"Neven",
""
],
[
"Choudhary",
"Arpita",
""
],
[
"Das",
"Tapas K",
""
],
[
"Nag",
"Sankhasubhra",
""
]
] | For axially symmetric flow of dissipationless inhomogeneous fluid onto a non rotating astrophysical black hole under the influence of a generalized pseudo-Schwarzschild gravitational potential, we investigate the influence of the background flow configuration on determining the salient features of the corresponding aco... |
2208.09892 | Ali Hajilou | Seyed Naseh Sajadi, Ali Hajilou, Seyed Hossein Hendi | Analytically Approximation Solution to $R^{2}$ Gravity | 16 pages, 5 figures, accepted for publication in EPJC | null | null | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we obtain analytical approximate black hole solutions in the
framework of $f(R)$ gravity and the absence of a cosmological constant. In this
area, we apply the equations of motion of the theory to a spherically symmetric
spacetime with one unknown function and derive black hole solutions without any
co... | [
{
"created": "Sun, 21 Aug 2022 14:28:09 GMT",
"version": "v1"
},
{
"created": "Tue, 7 Mar 2023 13:48:01 GMT",
"version": "v2"
}
] | 2023-03-08 | [
[
"Sajadi",
"Seyed Naseh",
""
],
[
"Hajilou",
"Ali",
""
],
[
"Hendi",
"Seyed Hossein",
""
]
] | In this paper, we obtain analytical approximate black hole solutions in the framework of $f(R)$ gravity and the absence of a cosmological constant. In this area, we apply the equations of motion of the theory to a spherically symmetric spacetime with one unknown function and derive black hole solutions without any cons... |
1710.06460 | Valerio Faraoni | Marianne Lapierre-Leonard, Valerio Faraoni, and Faycal Hammad | Cosmological applications of the Brown-York quasilocal mass | 8 pages, to appear in Phys. Rev. D | null | 10.1103/PhysRevD.96.083525 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Brown-York quasilocal energy is applied to three cosmological problems
which have previously been studied with the Hawking-Hayward quasilocal energy
(Newtonian simulations of large scale structure formation, turnaround radius in
the present accelerating universe, and lensing by the cosmological constant).
It is f... | [
{
"created": "Tue, 17 Oct 2017 18:27:24 GMT",
"version": "v1"
}
] | 2017-11-22 | [
[
"Lapierre-Leonard",
"Marianne",
""
],
[
"Faraoni",
"Valerio",
""
],
[
"Hammad",
"Faycal",
""
]
] | The Brown-York quasilocal energy is applied to three cosmological problems which have previously been studied with the Hawking-Hayward quasilocal energy (Newtonian simulations of large scale structure formation, turnaround radius in the present accelerating universe, and lensing by the cosmological constant). It is fou... |
1309.2556 | Roberto Ivan Cabrera Munguia | I. Cabrera-Munguia, Claus L\"ammerzahl, L. A. L\'opez, Alfredo
Mac\'ias | Opposite charged two-body system of identical counter-rotating black
holes | 9 pages, 4 figures | Phys.Rev.D88:084062,2013 | 10.1103/PhysRevD.88.084062 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A 4-parametric exact solution describing a two-body system of identical
Kerr-Newman counter-rotating black holes endowed with opposite
electric/magnetic charges is presented. The axis conditions are solved in order
to really describe two black holes separated by a massless strut. Moreover, the
explicit form of the ho... | [
{
"created": "Tue, 10 Sep 2013 15:57:19 GMT",
"version": "v1"
},
{
"created": "Sun, 3 Nov 2013 12:16:14 GMT",
"version": "v2"
},
{
"created": "Mon, 12 May 2014 06:15:38 GMT",
"version": "v3"
}
] | 2014-05-13 | [
[
"Cabrera-Munguia",
"I.",
""
],
[
"Lämmerzahl",
"Claus",
""
],
[
"López",
"L. A.",
""
],
[
"Macías",
"Alfredo",
""
]
] | A 4-parametric exact solution describing a two-body system of identical Kerr-Newman counter-rotating black holes endowed with opposite electric/magnetic charges is presented. The axis conditions are solved in order to really describe two black holes separated by a massless strut. Moreover, the explicit form of the hori... |
0910.1646 | Alex Bernardini | Alex E. Bernardini | Mass varying dark matter in effective GCG scenarios | 17 pages, 3 figures | Phys.Rev.D80:103522,2009 | 10.1103/PhysRevD.80.103522 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A unified treatment of mass varying dark matter coupled to cosmon-{\em like}
dark energy is shown to result in {\em effective} generalized Chaplygin gas
(GCG) scenarios. The mass varying mechanism is treated as a cosmon field
inherent effect. Coupling dark matter with dark energy allows for reproducing
the conditions... | [
{
"created": "Fri, 9 Oct 2009 04:03:18 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Jan 2010 19:00:15 GMT",
"version": "v2"
}
] | 2014-11-20 | [
[
"Bernardini",
"Alex E.",
""
]
] | A unified treatment of mass varying dark matter coupled to cosmon-{\em like} dark energy is shown to result in {\em effective} generalized Chaplygin gas (GCG) scenarios. The mass varying mechanism is treated as a cosmon field inherent effect. Coupling dark matter with dark energy allows for reproducing the conditions f... |
gr-qc/9605002 | N. K. Dadhich | Naresh Dadhich | Isothermal spherical perfect fluid model: Uniqueness and Conformal
mapping | 7 pages, TeX version | Pramana 49 (1997) 417 | 10.1007/BF02847428 | IUCAA-16/96 | gr-qc astro-ph | null | We prove the theorem: The necessary and sufficient condition for a
spherically symmetric spacetime to represent an isothermal perfect fluid
(barotropic equation of state with density falling off as inverse square of the
curvature radius) distribution without boundary is that it is conformal to the
``minimally'' curve... | [
{
"created": "Wed, 1 May 1996 16:11:07 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Dadhich",
"Naresh",
""
]
] | We prove the theorem: The necessary and sufficient condition for a spherically symmetric spacetime to represent an isothermal perfect fluid (barotropic equation of state with density falling off as inverse square of the curvature radius) distribution without boundary is that it is conformal to the ``minimally'' curved ... |
1809.00321 | Emil Nissimov | Eduardo Guendelman, Emil Nissimov, Svetlana Pacheva | Gauss-Bonnet Gravity in $D=4$ Without Gauss-Bonnet Coupling to Matter -
Cosmological Implications | 12 pages, v.2 new references and comments added, v.3 version accepted
for publication in Modern Physics Letters A | null | 10.1142/S0217732319500512 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We propose a new model of $D=4$ Gauss-Bonnet gravity. To avoid the usual
property of the integral over the standard $D=4$ Gauss-Bonnet scalar becoming a
total derivative term, we employ the formalism of metric-independent
non-Riemannian spacetime volume elements which makes the D=4 Gauss-Bonnet
action term non-trivia... | [
{
"created": "Sun, 2 Sep 2018 09:54:50 GMT",
"version": "v1"
},
{
"created": "Wed, 12 Sep 2018 15:17:18 GMT",
"version": "v2"
},
{
"created": "Tue, 11 Dec 2018 09:18:30 GMT",
"version": "v3"
}
] | 2019-03-27 | [
[
"Guendelman",
"Eduardo",
""
],
[
"Nissimov",
"Emil",
""
],
[
"Pacheva",
"Svetlana",
""
]
] | We propose a new model of $D=4$ Gauss-Bonnet gravity. To avoid the usual property of the integral over the standard $D=4$ Gauss-Bonnet scalar becoming a total derivative term, we employ the formalism of metric-independent non-Riemannian spacetime volume elements which makes the D=4 Gauss-Bonnet action term non-trivial ... |
1510.01477 | Christian Boehmer | Christian G. Boehmer, Nicola Tamanini, Matthew Wright | The Einstein static universe in Scalar-Fluid theories | 16 pages, 4 figures | Phys. Rev. D 92, 124067 (2015) | 10.1103/PhysRevD.92.124067 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A new Lagrangian framework has recently been proposed to describe
interactions between relativistic perfect fluids and scalar fields. In this
paper we investigate the Einstein static universe in this new class of
theories, which have been named Scalar-Fluid theories. The stability of the
static solutions to both homo... | [
{
"created": "Tue, 6 Oct 2015 08:49:24 GMT",
"version": "v1"
}
] | 2016-01-06 | [
[
"Boehmer",
"Christian G.",
""
],
[
"Tamanini",
"Nicola",
""
],
[
"Wright",
"Matthew",
""
]
] | A new Lagrangian framework has recently been proposed to describe interactions between relativistic perfect fluids and scalar fields. In this paper we investigate the Einstein static universe in this new class of theories, which have been named Scalar-Fluid theories. The stability of the static solutions to both homoge... |
1403.5338 | Stanley P. Gudder | Stan Gudder | A Unified Approach to Discrete Quantum Gravity | 15 pages. arXiv admin note: substantial text overlap with
arXiv:1311.3912 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is based on a covariant causal set (c-causet) approach to discrete
quantum gravity. A c-causet is a partially ordered set $(x,<)$ that is
invariant under labeling. We first consider the microscopic picture which
describes the detailed structure of c-causets. The unique labeling of a
c-causet $x$ enables us... | [
{
"created": "Fri, 21 Mar 2014 01:12:33 GMT",
"version": "v1"
},
{
"created": "Tue, 6 May 2014 01:22:42 GMT",
"version": "v2"
}
] | 2014-05-07 | [
[
"Gudder",
"Stan",
""
]
] | This paper is based on a covariant causal set (c-causet) approach to discrete quantum gravity. A c-causet is a partially ordered set $(x,<)$ that is invariant under labeling. We first consider the microscopic picture which describes the detailed structure of c-causets. The unique labeling of a c-causet $x$ enables us t... |
2206.06018 | Jose Barrientos | Jos\'e Barrientos and Jos\'e Mena | Joule-Thomson expansion of AdS black holes in quasi-topological
electromagnetism | Published PRD version | Phys. Rev. D 106, 044064 (2022) | 10.1103/PhysRevD.106.044064 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the Joule-Thomson expansion in Einstein-Maxwell theory supplemented
with the so-called quasitopological electromagnetism, this in the extended
phase space thermodynamic approach. We compute the Joule-Thomson coefficient
and depict all relevant inversion and isenthalpic curves in the
temperature-pressure plan... | [
{
"created": "Mon, 13 Jun 2022 10:17:48 GMT",
"version": "v1"
},
{
"created": "Mon, 29 Aug 2022 18:19:27 GMT",
"version": "v2"
}
] | 2022-08-31 | [
[
"Barrientos",
"José",
""
],
[
"Mena",
"José",
""
]
] | We study the Joule-Thomson expansion in Einstein-Maxwell theory supplemented with the so-called quasitopological electromagnetism, this in the extended phase space thermodynamic approach. We compute the Joule-Thomson coefficient and depict all relevant inversion and isenthalpic curves in the temperature-pressure plane,... |
1804.00535 | Shinji Tsujikawa | Lavinia Heisenberg, Ryotaro Kase, Shinji Tsujikawa | Odd-parity stability of hairy black holes in $U(1)$ gauge-invariant
scalar-vector-tensor theories | 15 pages, 3 figures | Phys. Rev. D 97, 124043 (2018) | 10.1103/PhysRevD.97.124043 | null | gr-qc astro-ph.CO hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In scalar-vector-tensor theories with $U(1)$ gauge invariance, it was
recently shown that there exists a new type of hairy black hole (BH) solutions
induced by a cubic-order scalar-vector interaction. In this paper, we derive
conditions for the absence of ghosts and Laplacian instabilities against
odd-parity perturba... | [
{
"created": "Mon, 2 Apr 2018 14:17:49 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jun 2018 12:14:00 GMT",
"version": "v2"
}
] | 2018-06-27 | [
[
"Heisenberg",
"Lavinia",
""
],
[
"Kase",
"Ryotaro",
""
],
[
"Tsujikawa",
"Shinji",
""
]
] | In scalar-vector-tensor theories with $U(1)$ gauge invariance, it was recently shown that there exists a new type of hairy black hole (BH) solutions induced by a cubic-order scalar-vector interaction. In this paper, we derive conditions for the absence of ghosts and Laplacian instabilities against odd-parity perturbati... |
gr-qc/0007068 | Metin Gurses | Metin Gurses (Bilkent University) and Atalay Karasu (METU) | Some Higher Dimensional Vacuum Solutions | Latex2e (amssymb) file, 15 pages | Class.Quant.Grav. 18 (2001) 509-516 | 10.1088/0264-9381/18/3/310 | null | gr-qc | null | We study an even dimensional manifold with a pseudo-Riemannian metric with
arbitrary signature and arbitrary dimensions. We consider the Ricci flat
equations and present a procedure to construct solutions to some higher (even)
dimensional Ricci flat field equations from the four diemnsional Ricci flat
metrics. When t... | [
{
"created": "Tue, 25 Jul 2000 09:41:52 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Gurses",
"Metin",
"",
"Bilkent University"
],
[
"Karasu",
"Atalay",
"",
"METU"
]
] | We study an even dimensional manifold with a pseudo-Riemannian metric with arbitrary signature and arbitrary dimensions. We consider the Ricci flat equations and present a procedure to construct solutions to some higher (even) dimensional Ricci flat field equations from the four diemnsional Ricci flat metrics. When the... |
1502.05000 | Davood Momeni Dr | Davood Momeni, H. Gholizade, Muhammad Raza, Ratbay Myrzakulov | Tolman-Oppenheimer-Volkoff equations in non-local $f(R)$ gravity | Accepted in "International Journal of Modern Physics A",20 pages, 10
figures, 2 tables | Int. J. Mod. Phys. A 30, 1550093 (2015) | 10.1142/S0217751X15500931 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Non-local $f(R)$ gravity was proposed as a powerfull alternative to general
relativity (GR) . This theory has potentially adverse implications for infrared
(IR) regime as well as ultraviolent(UV) early epochs. However, there are a lot
of powerful features, making it really user-friendly. A scalar-tensor frame
compris... | [
{
"created": "Tue, 17 Feb 2015 18:48:59 GMT",
"version": "v1"
},
{
"created": "Sun, 22 Feb 2015 07:00:42 GMT",
"version": "v2"
},
{
"created": "Sat, 4 Apr 2015 11:11:08 GMT",
"version": "v3"
}
] | 2015-06-11 | [
[
"Momeni",
"Davood",
""
],
[
"Gholizade",
"H.",
""
],
[
"Raza",
"Muhammad",
""
],
[
"Myrzakulov",
"Ratbay",
""
]
] | Non-local $f(R)$ gravity was proposed as a powerfull alternative to general relativity (GR) . This theory has potentially adverse implications for infrared (IR) regime as well as ultraviolent(UV) early epochs. However, there are a lot of powerful features, making it really user-friendly. A scalar-tensor frame comprisin... |
2009.04435 | Silvia Vicentini | Silvia Vicentini, Massimiliano Rinaldi | Vacuum decay in quadratic gravity | to appear in EPJ Plus; 33 pages | null | 10.1140/epjp/s13360-022-02529-6 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Metastable states decay at zero temperature through quantum tunneling at an
exponentially small rate, which depends on the Coleman-de Luccia instanton,
also known as bounce. In some theories, the bounce may not exist or its
on-shell action may be ill-defined or infinite, thus hindering the vacuum decay
process. In th... | [
{
"created": "Wed, 9 Sep 2020 17:30:37 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Jul 2021 08:15:08 GMT",
"version": "v2"
},
{
"created": "Sun, 27 Feb 2022 09:45:47 GMT",
"version": "v3"
}
] | 2022-03-15 | [
[
"Vicentini",
"Silvia",
""
],
[
"Rinaldi",
"Massimiliano",
""
]
] | Metastable states decay at zero temperature through quantum tunneling at an exponentially small rate, which depends on the Coleman-de Luccia instanton, also known as bounce. In some theories, the bounce may not exist or its on-shell action may be ill-defined or infinite, thus hindering the vacuum decay process. In this... |
gr-qc/0609031 | Yun Soo Myung | Yun Soo Myung, Yong-Wan Kim, Young-Jai Park | Black hole thermodynamics with generalized uncertainty principle | 11 pages, 4 eps.figures, version to appear in PLB | Phys.Lett.B645:393-397,2007 | 10.1016/j.physletb.2006.12.062 | INJE-TP-06-04 | gr-qc hep-th | null | We apply the generalized uncertainty principle to the thermodynamics of a
small black hole. Here we have a black hole system with the UV cutoff. It is
shown that the minimal length induced by the GUP interrupts the
Gross-Perry-Yaffe phase transition for a small black hole. In order to see
whether the black hole remna... | [
{
"created": "Fri, 8 Sep 2006 04:16:51 GMT",
"version": "v1"
},
{
"created": "Mon, 25 Dec 2006 01:30:01 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Myung",
"Yun Soo",
""
],
[
"Kim",
"Yong-Wan",
""
],
[
"Park",
"Young-Jai",
""
]
] | We apply the generalized uncertainty principle to the thermodynamics of a small black hole. Here we have a black hole system with the UV cutoff. It is shown that the minimal length induced by the GUP interrupts the Gross-Perry-Yaffe phase transition for a small black hole. In order to see whether the black hole remnant... |
2107.00049 | D. Jaffino Stargen | D. Jaffino Stargen, and Kinjalk Lochan | Cavity optimization for Unruh effect at small accelerations | 5 pages + 4 pages of appendix, 3 figures; to appear in Phys. Rev.
Lett | Phys. Rev. Lett. 129, 111303 (2022) | 10.1103/PhysRevLett.129.111303 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | One of the primary reasons behind the difficulty in observing the Unruh
effect is that for achievable acceleration scales the finite temperature
effects are significant only for the low frequency modes of the field. Since
the density of field modes falls for small frequencies in free space, the field
modes which are ... | [
{
"created": "Wed, 30 Jun 2021 18:10:44 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Aug 2022 05:30:50 GMT",
"version": "v2"
}
] | 2022-09-13 | [
[
"Stargen",
"D. Jaffino",
""
],
[
"Lochan",
"Kinjalk",
""
]
] | One of the primary reasons behind the difficulty in observing the Unruh effect is that for achievable acceleration scales the finite temperature effects are significant only for the low frequency modes of the field. Since the density of field modes falls for small frequencies in free space, the field modes which are re... |
gr-qc/0205018 | Eric Poisson | Eric Poisson | Radiative falloff of a scalar field in a weakly curved spacetime without
symmetries | 17 pages, RevTeX4 | Phys.Rev. D66 (2002) 044008 | 10.1103/PhysRevD.66.044008 | null | gr-qc | null | We consider a massless scalar field propagating in a weakly curved spacetime
whose metric is a solution to the linearized Einstein field equations. The
spacetime is assumed to be stationary and asymptotically flat, but no other
symmetries are imposed -- the spacetime can rotate and deviate strongly from
spherical sym... | [
{
"created": "Mon, 6 May 2002 15:29:08 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Poisson",
"Eric",
""
]
] | We consider a massless scalar field propagating in a weakly curved spacetime whose metric is a solution to the linearized Einstein field equations. The spacetime is assumed to be stationary and asymptotically flat, but no other symmetries are imposed -- the spacetime can rotate and deviate strongly from spherical symme... |
1302.2368 | Saps Buchman | S. Buchman, J.A. Lipa, R.L. Byer, D. DeBra, K. Balakrishnan, G.
Dufresne Cutler, A. Al-Fauwaz, E. Hultgren, A.K. Al-Jadaan, S. Saraf, S. Tan,
S. Al-Thubiti, A. Zoellner | LISA-2020: An Intermediate Scale Space Gravitational Wave Observatory
for This Decade | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Over the last three decades, an exceptionally good science case has been made
for pursuing gravitational wave (GW) astronomy. This has engendered a worldwide
effort to detect the extremely weak signals generated by expected sources. With
the next round of upgrades the ground based instruments are likely to make the
f... | [
{
"created": "Sun, 10 Feb 2013 21:20:41 GMT",
"version": "v1"
}
] | 2013-02-12 | [
[
"Buchman",
"S.",
""
],
[
"Lipa",
"J. A.",
""
],
[
"Byer",
"R. L.",
""
],
[
"DeBra",
"D.",
""
],
[
"Balakrishnan",
"K.",
""
],
[
"Cutler",
"G. Dufresne",
""
],
[
"Al-Fauwaz",
"A.",
""
],
[
"Hultgren"... | Over the last three decades, an exceptionally good science case has been made for pursuing gravitational wave (GW) astronomy. This has engendered a worldwide effort to detect the extremely weak signals generated by expected sources. With the next round of upgrades the ground based instruments are likely to make the fir... |
2009.09186 | Hamid Reza Sepangi | Afsaneh Rahmani, Mohsen Khodadi, Matin Honardoost, Hamid Reza Sepangi | Instability and no-hair paradigm in d-dimensional charged-AdS black
holes | 13 pages, 5 figures, to appear in Nuclear Physics B | Nuclear Physics B 960 (2020) 115185 | 10.1016/j.nuclphysb.2020.115185 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Is it possible the no-hair paradigm is violated when a black hole undergoes
an instability? Employing massless charged scalar perturbations, we address
this question within the context of conformally invariant Einstein-Maxwell
theory for some allowed $d$-dimensional ($d=4n+4$ with conformal parameter
$n=0,1,2,...$ ) ... | [
{
"created": "Sat, 19 Sep 2020 08:32:52 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Sep 2020 04:39:35 GMT",
"version": "v2"
}
] | 2020-10-01 | [
[
"Rahmani",
"Afsaneh",
""
],
[
"Khodadi",
"Mohsen",
""
],
[
"Honardoost",
"Matin",
""
],
[
"Sepangi",
"Hamid Reza",
""
]
] | Is it possible the no-hair paradigm is violated when a black hole undergoes an instability? Employing massless charged scalar perturbations, we address this question within the context of conformally invariant Einstein-Maxwell theory for some allowed $d$-dimensional ($d=4n+4$ with conformal parameter $n=0,1,2,...$ ) to... |
0705.4336 | Ran Li | Ji-Rong Ren, Ran Li, Fei-Hu Liu | Hawking Temperature of Dilaton Black Holes from Tunneling | 13pages, no figure, references added, Accepted by MPLA | Mod.Phys.Lett.A23:3419-3429,2009 | 10.1142/S0217732308028843 | null | gr-qc | null | Recently, it has been suggested that Hawking radiation can be derived from
quantum tunnelling methods. In this letter, we calculated Hawking temperature
of dilatonic black holes from tunnelling formalism. The two semi-classical
methods adopted here are: the null-geodesic method proposed by Parikh and
Wilczek and the ... | [
{
"created": "Wed, 30 May 2007 04:42:26 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Jun 2007 13:34:08 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Oct 2007 07:41:28 GMT",
"version": "v3"
}
] | 2009-02-12 | [
[
"Ren",
"Ji-Rong",
""
],
[
"Li",
"Ran",
""
],
[
"Liu",
"Fei-Hu",
""
]
] | Recently, it has been suggested that Hawking radiation can be derived from quantum tunnelling methods. In this letter, we calculated Hawking temperature of dilatonic black holes from tunnelling formalism. The two semi-classical methods adopted here are: the null-geodesic method proposed by Parikh and Wilczek and the Ha... |
gr-qc/9610057 | Malcolm Tobias | Peter Anninos, Joan Masso, Edward Seidel, Wai-Mo Suen, and Malcolm
Tobias | Dynamics of Gravitational Waves in 3D: Formulations, Methods, and Tests | 34 pages, 14 figures | Phys.Rev.D56:842-858,1997 | 10.1103/PhysRevD.56.842 | wugrav-96-11 | gr-qc | null | The dynamics of gravitational waves is investigated in full 3+1 dimensional
numerical relativity, emphasizing the difficulties that one might encounter in
numerical evolutions, particularly those arising from non-linearities and gauge
degrees of freedom. Using gravitational waves with amplitudes low enough that
one h... | [
{
"created": "Thu, 24 Oct 1996 15:30:17 GMT",
"version": "v1"
}
] | 2011-09-09 | [
[
"Anninos",
"Peter",
""
],
[
"Masso",
"Joan",
""
],
[
"Seidel",
"Edward",
""
],
[
"Suen",
"Wai-Mo",
""
],
[
"Tobias",
"Malcolm",
""
]
] | The dynamics of gravitational waves is investigated in full 3+1 dimensional numerical relativity, emphasizing the difficulties that one might encounter in numerical evolutions, particularly those arising from non-linearities and gauge degrees of freedom. Using gravitational waves with amplitudes low enough that one has... |
2402.16612 | Zhenwei Lyu | Zhenwei Lyu and Lijing Shao | Measuring Mass Transfer Rates in Coalescing Neutron Star--White Dwarf
Binaries with Deci-Hz Gravitational-wave Detectors | 15 pages, 4 figures, 1 table | null | null | null | gr-qc astro-ph.HE | http://creativecommons.org/licenses/by/4.0/ | Coalescing neutron star--white dwarf (NS-WD) binaries are among the primary
targets for upcoming space-borne gravitational wave (GW) detectors such as
LISA, TaiJi, TianQin, etc. During close interaction, these binaries undergo
mass transfer, emitting simultaneous X-rays and GWs. This offers a unique
opportunity to me... | [
{
"created": "Mon, 26 Feb 2024 14:42:56 GMT",
"version": "v1"
}
] | 2024-02-27 | [
[
"Lyu",
"Zhenwei",
""
],
[
"Shao",
"Lijing",
""
]
] | Coalescing neutron star--white dwarf (NS-WD) binaries are among the primary targets for upcoming space-borne gravitational wave (GW) detectors such as LISA, TaiJi, TianQin, etc. During close interaction, these binaries undergo mass transfer, emitting simultaneous X-rays and GWs. This offers a unique opportunity to meas... |
1906.04425 | Guang-Zhen Kang | Guang-Zhen Kang, De-Sheng Zhang, Long Du, Jun Xu and Hong-Shi Zong | Anisotropic evolution of 4-brane in a 6D generalized Randall-Sundrum
model | 7 pages, 1 figure | null | 10.1088/1674-1137/43/9/095101 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate a 6d generalized Randall-Sundrum brane world scenario with a
bulk cosmological constant. It is shown that each stress-energy tensor
$T_{ab}^{i}$ on the brane is similar to a constant vacuum energy. This is
consistent with the Randall-Sundrum model in which each 3-brane Lagrangian
separated out a consta... | [
{
"created": "Tue, 11 Jun 2019 08:01:12 GMT",
"version": "v1"
}
] | 2019-06-19 | [
[
"Kang",
"Guang-Zhen",
""
],
[
"Zhang",
"De-Sheng",
""
],
[
"Du",
"Long",
""
],
[
"Xu",
"Jun",
""
],
[
"Zong",
"Hong-Shi",
""
]
] | We investigate a 6d generalized Randall-Sundrum brane world scenario with a bulk cosmological constant. It is shown that each stress-energy tensor $T_{ab}^{i}$ on the brane is similar to a constant vacuum energy. This is consistent with the Randall-Sundrum model in which each 3-brane Lagrangian separated out a constant... |
gr-qc/0110098 | John Klauder | John R. Klauder | The Affine Quantum Gravity Program | 16 pages, LaTeX, no figures | Class.Quant.Grav. 19 (2002) 817-826 | 10.1088/0264-9381/19/4/313 | null | gr-qc hep-th | null | The central principle of affine quantum gravity is securing and maintaining
the strict positivity of the matrix $\{\hg_{ab}(x)\}$ composed of the spatial
components of the local metric operator. On spectral grounds, canonical
commutation relations are incompatible with this principle, and they must be
replaced by non... | [
{
"created": "Tue, 23 Oct 2001 14:32:36 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Klauder",
"John R.",
""
]
] | The central principle of affine quantum gravity is securing and maintaining the strict positivity of the matrix $\{\hg_{ab}(x)\}$ composed of the spatial components of the local metric operator. On spectral grounds, canonical commutation relations are incompatible with this principle, and they must be replaced by nonca... |
1306.6501 | Christos Tsagas | Christos G. Tsagas and Miltiadis I. Kadiltzoglou | The peculiar Raychaudhuri equation | Typos corrected, references added. Published version | Phys.Rev.D88:083501,2013 | 10.1103/PhysRevD.88.083501 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Peculiar motions are commonplace in the universe. Our local group of
galaxies, for example, drifts relative to the Hubble flow at about 600 km/sec.
Such bulk flows are believed to fade away as we move on to progressively larger
scales. Recently, however, there have been reports of peculiar motions larger
and faster t... | [
{
"created": "Thu, 27 Jun 2013 13:58:26 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Sep 2013 15:29:11 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Oct 2013 15:11:40 GMT",
"version": "v3"
}
] | 2015-06-16 | [
[
"Tsagas",
"Christos G.",
""
],
[
"Kadiltzoglou",
"Miltiadis I.",
""
]
] | Peculiar motions are commonplace in the universe. Our local group of galaxies, for example, drifts relative to the Hubble flow at about 600 km/sec. Such bulk flows are believed to fade away as we move on to progressively larger scales. Recently, however, there have been reports of peculiar motions larger and faster tha... |
2107.00120 | John Davis | V. Vadakkumbatt, M. Hirschel, J. Manley, T.J. Clark, S. Singh, and
J.P. Davis | Prototype Superfluid Gravitational Wave Detector | 8 pages, 7 figures | Phys. Rev. D 104, 082001 (2021) | 10.1103/PhysRevD.104.082001 | null | gr-qc astro-ph.IM cond-mat.other quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study a cross-shaped cavity filled with superfluid $^4$He as a prototype
resonant-mass gravitational wave detector. Using a membrane and a re-entrant
microwave cavity as a sensitive optomechanical transducer, we were able to
observe the thermally excited high-$Q$ acoustic modes of the helium at 20 mK
temperature a... | [
{
"created": "Wed, 30 Jun 2021 22:00:39 GMT",
"version": "v1"
}
] | 2021-10-04 | [
[
"Vadakkumbatt",
"V.",
""
],
[
"Hirschel",
"M.",
""
],
[
"Manley",
"J.",
""
],
[
"Clark",
"T. J.",
""
],
[
"Singh",
"S.",
""
],
[
"Davis",
"J. P.",
""
]
] | We study a cross-shaped cavity filled with superfluid $^4$He as a prototype resonant-mass gravitational wave detector. Using a membrane and a re-entrant microwave cavity as a sensitive optomechanical transducer, we were able to observe the thermally excited high-$Q$ acoustic modes of the helium at 20 mK temperature and... |
1706.08844 | Pardyumn Kumar Sahoo | Binaya K. Bishi, S.K.J. Pacif, P.K. Sahoo, G.P. Singh | LRS Bianchi type-I cosmological model with constant deceleration
parameter in $f(R,T)$ gravity | Published version | International Journal of Geometric Methods in Modern Physics, 14
(2017) 1750158 | 10.1142/S0219887817501584 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A spatially homogeneous anisotropic LRS Bianchi type-I cosmological model is
studied in $f(R,T)$ gravity with a special form of Hubble's parameter, which
leads to constant deceleration parameter. The parameters involved in the
considered form of Hubble parameter can be tuned to match, our models with the
$\Lambda $CD... | [
{
"created": "Fri, 23 Jun 2017 18:14:27 GMT",
"version": "v1"
},
{
"created": "Wed, 19 Jul 2017 12:20:03 GMT",
"version": "v2"
}
] | 2022-07-20 | [
[
"Bishi",
"Binaya K.",
""
],
[
"Pacif",
"S. K. J.",
""
],
[
"Sahoo",
"P. K.",
""
],
[
"Singh",
"G. P.",
""
]
] | A spatially homogeneous anisotropic LRS Bianchi type-I cosmological model is studied in $f(R,T)$ gravity with a special form of Hubble's parameter, which leads to constant deceleration parameter. The parameters involved in the considered form of Hubble parameter can be tuned to match, our models with the $\Lambda $CDM ... |
0911.4939 | Reinhard Meinel | Reinhard Meinel | Relativistic figures of equilibrium: from Maclaurin spheroids to Kerr
black holes | 3 pages, talk given at the Twelfth Marcel Grossmann Meeting (Paris,
July 12 - 18, 2009), submitted to the Conference Proceedings, v3: references
updated | null | 10.1142/9789814374552_0401 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analytical and numerical results on equilibrium configurations of rotating
fluid bodies within Einstein's theory of gravitation are reviewed. Particular
emphasis is placed on continuous parametric transitions to black holes. In this
connection the uniqueness of extremal Kerr black holes is discussed.
| [
{
"created": "Wed, 25 Nov 2009 19:38:28 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Nov 2009 22:27:54 GMT",
"version": "v2"
},
{
"created": "Fri, 19 Mar 2010 21:07:05 GMT",
"version": "v3"
}
] | 2016-11-15 | [
[
"Meinel",
"Reinhard",
""
]
] | Analytical and numerical results on equilibrium configurations of rotating fluid bodies within Einstein's theory of gravitation are reviewed. Particular emphasis is placed on continuous parametric transitions to black holes. In this connection the uniqueness of extremal Kerr black holes is discussed. |
1802.01332 | Debabrata Deb | Debabrata Deb, Maxim Khlopov, Farook Rahaman, Saibal Ray and B.K. Guha | Anisotropic strange stars in the Einstein-Maxwell spacetime | 12 pages, 11 figures, 2 tables | null | 10.1140/epjc/s10052-018-5930-x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present here a detailed analysis on the effects of charge on the
anisotropic strange star candidates by considering a spherically symmetric
interior spacetime metric. To obtain exact solution of the Einstein-Maxwell
field equations we have considered the anisotropic strange quark matter (SQM)
distribution governed... | [
{
"created": "Mon, 5 Feb 2018 10:20:23 GMT",
"version": "v1"
}
] | 2018-07-04 | [
[
"Deb",
"Debabrata",
""
],
[
"Khlopov",
"Maxim",
""
],
[
"Rahaman",
"Farook",
""
],
[
"Ray",
"Saibal",
""
],
[
"Guha",
"B. K.",
""
]
] | We present here a detailed analysis on the effects of charge on the anisotropic strange star candidates by considering a spherically symmetric interior spacetime metric. To obtain exact solution of the Einstein-Maxwell field equations we have considered the anisotropic strange quark matter (SQM) distribution governed b... |
gr-qc/0302006 | Yuri Kubyshin | E. Garcia-Berro, Yu.A. Kubyshin and P. Loren-Aguilar | Time variation of the gravitational and fine structure constants in
models with extra dimensions | 5 pages, LaTeX, to appear in the Proceedings of the Spanish
Relativity Meeting ERE-2002 (Mao, Spain, September 22-24, 2002) | null | null | null | gr-qc | null | We derive formulae for the time variation of the gravitational ``constant''
and of the fine structure ``constant'' in various models with extra dimensions
and analyze their consistency with the observational data.
| [
{
"created": "Mon, 3 Feb 2003 11:21:47 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Feb 2003 16:45:28 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Feb 2003 11:10:46 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Garcia-Berro",
"E.",
""
],
[
"Kubyshin",
"Yu. A.",
""
],
[
"Loren-Aguilar",
"P.",
""
]
] | We derive formulae for the time variation of the gravitational ``constant'' and of the fine structure ``constant'' in various models with extra dimensions and analyze their consistency with the observational data. |
2311.00248 | Tayyab Naseer | M. Sharif, T. Naseer | Complexity of Dynamical Dissipative Cylindrical System in Non-minimally
Coupled Theory | 27 pages, no figure | Chin. J. Phys. 77(2022)2655-2667 | 10.1016/j.cjph.2022.04.020 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper aims to formulate certain scalar factors associated with matter
variables for self-gravitating non-static cylindrical geometry by considering a
standard model $\mathcal{R}+\zeta\mathcal{Q}$ of
$f(\mathcal{R},\mathcal{T},\mathcal{Q})$ gravity, where
$\mathcal{Q}=\mathcal{R}_{\varphi\vartheta}\mathcal{T}^{\v... | [
{
"created": "Wed, 1 Nov 2023 03:02:32 GMT",
"version": "v1"
}
] | 2023-11-02 | [
[
"Sharif",
"M.",
""
],
[
"Naseer",
"T.",
""
]
] | This paper aims to formulate certain scalar factors associated with matter variables for self-gravitating non-static cylindrical geometry by considering a standard model $\mathcal{R}+\zeta\mathcal{Q}$ of $f(\mathcal{R},\mathcal{T},\mathcal{Q})$ gravity, where $\mathcal{Q}=\mathcal{R}_{\varphi\vartheta}\mathcal{T}^{\var... |
2309.08409 | Luis Herrera | L. Herrera, A. Di Prisco, J. Ospino and J. Carot | Quasi--hyperbolically symmetric $\gamma$-metric | 9 pages Revtex 4, 2 figures. Published in Entropy (SI: Selected
Featured Papers from Entropy Editorial Board Members) | Entropy 25, 1338 (2023) | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-nd/4.0/ | We carry out a systematic study on the motion of test particles in the region
inner to the naked singularity of a quasi--hyperbolically symmetric
$\gamma$-metric. The geodesic equations are written and analyzed in detail. The
obtained results are contrasted with the corresponding results obtained for the
axially symm... | [
{
"created": "Fri, 15 Sep 2023 14:12:43 GMT",
"version": "v1"
}
] | 2023-09-18 | [
[
"Herrera",
"L.",
""
],
[
"Di Prisco",
"A.",
""
],
[
"Ospino",
"J.",
""
],
[
"Carot",
"J.",
""
]
] | We carry out a systematic study on the motion of test particles in the region inner to the naked singularity of a quasi--hyperbolically symmetric $\gamma$-metric. The geodesic equations are written and analyzed in detail. The obtained results are contrasted with the corresponding results obtained for the axially symmet... |
2310.16980 | Shrobana Ghosh | Shrobana Ghosh, Panagiota Kolitsidou and Mark Hannam | First frequency-domain phenomenological model of the multipole asymmetry
in gravitational-wave signals from binary-black-hole coalescence | 14 pages, 14 figures | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | Gravitational-wave signals from binaries that contain spinning black holes in
general include an asymmetry between the $+m$ and $-m$ multipoles that is not
included in most signal models used in LIGO-Virgo-KAGRA (LVK) analysis to date.
This asymmetry manifests itself in out-of-plane recoil of the final black hole
and... | [
{
"created": "Wed, 25 Oct 2023 20:31:50 GMT",
"version": "v1"
}
] | 2023-10-27 | [
[
"Ghosh",
"Shrobana",
""
],
[
"Kolitsidou",
"Panagiota",
""
],
[
"Hannam",
"Mark",
""
]
] | Gravitational-wave signals from binaries that contain spinning black holes in general include an asymmetry between the $+m$ and $-m$ multipoles that is not included in most signal models used in LIGO-Virgo-KAGRA (LVK) analysis to date. This asymmetry manifests itself in out-of-plane recoil of the final black hole and i... |
2106.06432 | John Bayron Orjuela Quintana | J. Bayron Orjuela-Quintana and C\'esar A. Valenzuela-Toledo | Anisotropic $k$-essence | V2: Typos corrected and comments added, 18 pages, 8 figures. arXiv
admin note: text overlap with arXiv:2012.09946 | Phys.Dark Univ. 33 (2021) 100857 | 10.1016/j.dark.2021.100857 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the late time cosmology of a non-canonical scalar
field ($k$-essence) coupled to a vector field in a Bianchi-I background.
Specifically, we study three cases: canonical scalar field (quintessence) with
exponential potential as a warm up, the dilatonic ghost condensate, and the
Dirac Born Infel... | [
{
"created": "Fri, 11 Jun 2021 14:42:08 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Jul 2021 15:52:45 GMT",
"version": "v2"
}
] | 2021-09-02 | [
[
"Orjuela-Quintana",
"J. Bayron",
""
],
[
"Valenzuela-Toledo",
"César A.",
""
]
] | In this paper, we study the late time cosmology of a non-canonical scalar field ($k$-essence) coupled to a vector field in a Bianchi-I background. Specifically, we study three cases: canonical scalar field (quintessence) with exponential potential as a warm up, the dilatonic ghost condensate, and the Dirac Born Infeld ... |
1907.06540 | Katerina Chatziioannou | Katerina Chatziioannou, Carl-Johan Haster, Tyson B. Littenberg, Will
M. Farr, Sudarshan Ghonge, Margaret Millhouse, James A. Clark, and Neil
Cornish | Noise spectral estimation methods and their impact on gravitational wave
measurement of compact binary mergers | 12 pages, 10 figures, final published version | Phys. Rev. D 100, 104004 (2019) | 10.1103/PhysRevD.100.104004 | null | gr-qc astro-ph.HE astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Estimating the parameters of gravitational wave signals detected by
ground-based detectors requires an understanding of the properties of the
detectors' noise. In particular, the most commonly used likelihood function for
gravitational wave data analysis assumes that the noise is Gaussian,
stationary, and of known fr... | [
{
"created": "Mon, 15 Jul 2019 15:09:20 GMT",
"version": "v1"
},
{
"created": "Tue, 5 Nov 2019 15:57:48 GMT",
"version": "v2"
}
] | 2019-11-13 | [
[
"Chatziioannou",
"Katerina",
""
],
[
"Haster",
"Carl-Johan",
""
],
[
"Littenberg",
"Tyson B.",
""
],
[
"Farr",
"Will M.",
""
],
[
"Ghonge",
"Sudarshan",
""
],
[
"Millhouse",
"Margaret",
""
],
[
"Clark",
"James ... | Estimating the parameters of gravitational wave signals detected by ground-based detectors requires an understanding of the properties of the detectors' noise. In particular, the most commonly used likelihood function for gravitational wave data analysis assumes that the noise is Gaussian, stationary, and of known freq... |
1406.4417 | Hamed Pejhan | S. Rahbardehghan, H. Pejhan and M. Elmizadeh | A Group Theoretical Approach to Graviton Two-Point Function | 10 pages | Eur. Phys. J. C (2015) 75:119 | 10.1140/epjc/s10052-015-3339-3 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Respecting the group theoretical approach, it is debated that the theory of
linear conformal gravity should be formulated through a tensor field of rank-3
and mixed symmetry \cite{binegar}. Pursuing this path, such a field equation
was obtained in de Sitter space \cite{takook}. In present work, considering the
de Sit... | [
{
"created": "Tue, 17 Jun 2014 16:30:32 GMT",
"version": "v1"
},
{
"created": "Mon, 19 Jan 2015 19:20:31 GMT",
"version": "v2"
},
{
"created": "Thu, 22 Jan 2015 19:12:07 GMT",
"version": "v3"
}
] | 2015-06-22 | [
[
"Rahbardehghan",
"S.",
""
],
[
"Pejhan",
"H.",
""
],
[
"Elmizadeh",
"M.",
""
]
] | Respecting the group theoretical approach, it is debated that the theory of linear conformal gravity should be formulated through a tensor field of rank-3 and mixed symmetry \cite{binegar}. Pursuing this path, such a field equation was obtained in de Sitter space \cite{takook}. In present work, considering the de Sitte... |
gr-qc/9409006 | Masaru Siino | Ding Shuxue, Yasushige Maeda and Masaru Siino | Topology Changes by Quantum Tunneling in Four Dimensions | 13 pages revtex.sty, 6 uuencoded figures contained,
TIT/HEP-260/COSMO-45 | Phys. Lett. B354 (1995) 46 | 10.1016/0370-2693(95)00621-Q | null | gr-qc hep-th | null | We investigate topology-changing processes in 4-dimensional quantum gravity
with a negative cosmological constant. By playing the ``gluing-polytope game"
in hyperbolic geometry, we explicitly construct an instanton-like solution
without singularity. Because of cusps, this solution is non-compact but has a
finite volu... | [
{
"created": "Mon, 5 Sep 1994 13:18:32 GMT",
"version": "v1"
}
] | 2019-08-15 | [
[
"Shuxue",
"Ding",
""
],
[
"Maeda",
"Yasushige",
""
],
[
"Siino",
"Masaru",
""
]
] | We investigate topology-changing processes in 4-dimensional quantum gravity with a negative cosmological constant. By playing the ``gluing-polytope game" in hyperbolic geometry, we explicitly construct an instanton-like solution without singularity. Because of cusps, this solution is non-compact but has a finite volume... |
2407.14685 | \"Ozg\"ur \"Okc\"u | \"Ozg\"ur \"Okc\"u, Ekrem Aydiner | Exponential correction to Friedmann equations | 20 pages, 2 figures, 4 tables | Gen Relativ Gravit 56 (2024) 87 | 10.1007/s10714-024-03273-1 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, employing the exponential corrected entropy (Chatterjee and
Ghosh in Phys Rev Lett 125:041302, 2020), we derive the modified Friedmann
equations from the first law of thermodynamics at apparent horizon and
Verlinde's entropic gravity scenario. First, we derive the modified Friedmann
equations from the ... | [
{
"created": "Fri, 19 Jul 2024 22:04:28 GMT",
"version": "v1"
}
] | 2024-07-23 | [
[
"Ökcü",
"Özgür",
""
],
[
"Aydiner",
"Ekrem",
""
]
] | In this paper, employing the exponential corrected entropy (Chatterjee and Ghosh in Phys Rev Lett 125:041302, 2020), we derive the modified Friedmann equations from the first law of thermodynamics at apparent horizon and Verlinde's entropic gravity scenario. First, we derive the modified Friedmann equations from the fi... |
gr-qc/0407069 | Ghanashyam Date | Ghanashyam Date and Golam Mortuza Hossain | Genericness of inflation in isotropic loop quantum cosmology | 4 pages, revtex4, one figure. Only e-print archive numbers correctedi
in the second version. Reference added in the 3rd version. Final version to
appear in Phys. Rev. Lett. Explanations improved | Phys.Rev.Lett. 94 (2005) 011301 | 10.1103/PhysRevLett.94.011301 | IMSc/2004/07/28 | gr-qc astro-ph hep-th | null | Non-perturbative corrections from loop quantum cosmology (LQC) to the scalar
matter sector is already known to imply inflation. We prove that the LQC
modified scalar field generates exponential inflation in the small scale factor
regime, for all positive definite potentials, independent of initial conditions
and inde... | [
{
"created": "Mon, 19 Jul 2004 14:04:45 GMT",
"version": "v1"
},
{
"created": "Wed, 21 Jul 2004 03:58:27 GMT",
"version": "v2"
},
{
"created": "Tue, 12 Oct 2004 20:47:01 GMT",
"version": "v3"
},
{
"created": "Wed, 8 Dec 2004 19:52:56 GMT",
"version": "v4"
}
] | 2009-11-10 | [
[
"Date",
"Ghanashyam",
""
],
[
"Hossain",
"Golam Mortuza",
""
]
] | Non-perturbative corrections from loop quantum cosmology (LQC) to the scalar matter sector is already known to imply inflation. We prove that the LQC modified scalar field generates exponential inflation in the small scale factor regime, for all positive definite potentials, independent of initial conditions and indepe... |
gr-qc/0401078 | Sun Myong Kim | Sung Ku Kim, Sun Myong Kim, Chaiho Rim, Jae Hyung Yee | Propagation of Light in Doubly Special Relativity | 11 pages, LaTeX | J.Korean Phys.Soc. 45 (2004) 1435-1440 | null | null | gr-qc hep-th | null | In an attempt to clarify what is the velocity of a particle in doubly special
relativity, we solve Maxwell's equations invariant under the position-space
nonlinear Lorentz transformation proposed by Kimberly, Magueijo, and Medeiros.
We show that only the amplitude of the Maxwell wave, not the phase, is affected
by th... | [
{
"created": "Sat, 17 Jan 2004 10:49:18 GMT",
"version": "v1"
},
{
"created": "Wed, 12 May 2004 12:36:41 GMT",
"version": "v2"
},
{
"created": "Tue, 7 Dec 2004 01:17:54 GMT",
"version": "v3"
}
] | 2007-05-23 | [
[
"Kim",
"Sung Ku",
""
],
[
"Kim",
"Sun Myong",
""
],
[
"Rim",
"Chaiho",
""
],
[
"Yee",
"Jae Hyung",
""
]
] | In an attempt to clarify what is the velocity of a particle in doubly special relativity, we solve Maxwell's equations invariant under the position-space nonlinear Lorentz transformation proposed by Kimberly, Magueijo, and Medeiros. We show that only the amplitude of the Maxwell wave, not the phase, is affected by the ... |
1905.00898 | Pei-Ming Ho | Pei-Ming Ho, Yoshinori Matsuo | Trapping Horizon and Negative Energy | 17 pages, 3 figures | null | 10.1007/JHEP06(2019)057 | OU-HET 1011 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming spherical symmetry and the semi-classical Einstein equation, we
prove that, for the observers on top of the trapping horizon, the vacuum
energy-momentum tensor is always that of an ingoing negative energy flux at the
speed of light with a universal energy density ${\cal E} \simeq - 1/(2\kappa
a^2)$, (where $... | [
{
"created": "Thu, 2 May 2019 12:45:44 GMT",
"version": "v1"
},
{
"created": "Thu, 16 May 2019 11:37:37 GMT",
"version": "v2"
}
] | 2019-07-24 | [
[
"Ho",
"Pei-Ming",
""
],
[
"Matsuo",
"Yoshinori",
""
]
] | Assuming spherical symmetry and the semi-classical Einstein equation, we prove that, for the observers on top of the trapping horizon, the vacuum energy-momentum tensor is always that of an ingoing negative energy flux at the speed of light with a universal energy density ${\cal E} \simeq - 1/(2\kappa a^2)$, (where $a$... |
gr-qc/9610047 | Ilja Schmelzer | Ilja Schmelzer (WIAS Berlin) | Postrelativity --- A Paradigm For Quantization With Preferred Newtonian
Frame | 51 pages Latex; see also http://www.c2.org/~ilja/ | null | null | null | gr-qc | null | We define a new paradigm --- postrelativity --- based on the hypothesis of a
preferred hidden Newtonian frame in relativistic theories. It leads to a
modification of general relativity with ether interpretation, without
topological problems, black hole and big bang singularities. Semiclassical
theory predicts Hawking... | [
{
"created": "Tue, 22 Oct 1996 11:02:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Schmelzer",
"Ilja",
"",
"WIAS Berlin"
]
] | We define a new paradigm --- postrelativity --- based on the hypothesis of a preferred hidden Newtonian frame in relativistic theories. It leads to a modification of general relativity with ether interpretation, without topological problems, black hole and big bang singularities. Semiclassical theory predicts Hawking r... |
1905.03942 | Ruben Cordero | Ruben Cordero (Mexico, ESFM) and Roberto D. Mota | New Exact Supersymmetric Wave Functions for a Massless Scalar Field and
Axion-Dilaton String Cosmology in a FRWL Metric | 21 pages, 15 figures, typos corrected | Eur. Phys. J. Plus 135 (2020), 78 | 10.1140/epjp/s13360-020-00114-3 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the quantum cosmology of the 2D Hawking-Page massless scalar-field
model and the homogeneous and isotropic dilation-axion string cosmology.For
both models we find new exact solutions for the Wheeler-DeWitt equation and for
the supersymmetric wave function equations. We show that the Wheeler-DeWitt
equations ... | [
{
"created": "Fri, 10 May 2019 05:09:00 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Jan 2020 02:30:04 GMT",
"version": "v2"
}
] | 2020-01-22 | [
[
"Cordero",
"Ruben",
"",
"Mexico, ESFM"
],
[
"Mota",
"Roberto D.",
""
]
] | We study the quantum cosmology of the 2D Hawking-Page massless scalar-field model and the homogeneous and isotropic dilation-axion string cosmology.For both models we find new exact solutions for the Wheeler-DeWitt equation and for the supersymmetric wave function equations. We show that the Wheeler-DeWitt equations fo... |
0808.1193 | Marco Pizzi | V. Belinski, M. Pizzi, A. Paolino | Charged membrane as a source for repulsive gravity | Accepted for publication in IJMPD, 17-07-2008; 16 pages, 1 figure | Int.J.Mod.Phys.D18:513-528,2009 | 10.1142/S0218271809014704 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate an alternative (with respect to the ones existing in
literature) and more habitual for physicists derivation of exact solution of
the Einstein-Maxwell equations for the motion of a charged spherical membrane
with tangential tension. We stress that the physically acceptable range of
parameters for which... | [
{
"created": "Fri, 8 Aug 2008 11:10:25 GMT",
"version": "v1"
}
] | 2009-07-17 | [
[
"Belinski",
"V.",
""
],
[
"Pizzi",
"M.",
""
],
[
"Paolino",
"A.",
""
]
] | We demonstrate an alternative (with respect to the ones existing in literature) and more habitual for physicists derivation of exact solution of the Einstein-Maxwell equations for the motion of a charged spherical membrane with tangential tension. We stress that the physically acceptable range of parameters for which t... |
2308.00643 | Jonathan Gl\"ockle | Jonathan Gl\"ockle | Initial data sets with dominant energy condition admitting no smooth dec
spacetime extension | 10 pages. Comments welcome! | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | There are two versions of the dominant energy condition (=dec): The original
one for Lorentzian manifolds and an associated one for initial data sets. If a
Lorentzian manifold satisfies dec, then so does the induced initial set on any
embedded spacelike hypersurface. In this article, we discuss the question of a
pote... | [
{
"created": "Tue, 1 Aug 2023 16:17:46 GMT",
"version": "v1"
}
] | 2023-08-02 | [
[
"Glöckle",
"Jonathan",
""
]
] | There are two versions of the dominant energy condition (=dec): The original one for Lorentzian manifolds and an associated one for initial data sets. If a Lorentzian manifold satisfies dec, then so does the induced initial set on any embedded spacelike hypersurface. In this article, we discuss the question of a potent... |
gr-qc/9804079 | Guillaume Faye | Luc Blanchet, Guillaume Faye and B\'en\'edicte Ponsot | Gravitational field and equations of motion of compact binaries to 5/2
post-Newtonian order | 41 pages to appear in Physical Review D | Phys.Rev. D58 (1998) 124002 | 10.1103/PhysRevD.58.124002 | null | gr-qc | null | We derive the gravitational field and equations of motion of compact binary
systems up to the 5/2 post-Newtonian approximation of general relativity (where
radiation-reaction effects first appear). The approximate post-Newtonian
gravitational field might be used in the problem of initial conditions for the
numerical ... | [
{
"created": "Wed, 29 Apr 1998 11:13:12 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Aug 1998 17:57:19 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Blanchet",
"Luc",
""
],
[
"Faye",
"Guillaume",
""
],
[
"Ponsot",
"Bénédicte",
""
]
] | We derive the gravitational field and equations of motion of compact binary systems up to the 5/2 post-Newtonian approximation of general relativity (where radiation-reaction effects first appear). The approximate post-Newtonian gravitational field might be used in the problem of initial conditions for the numerical ev... |
2103.00195 | Francesco Cianfrani Dr | Francesco Cianfrani | Gravitational quantum states as finite representations of the Lorentz
group | 5 pages, to appear in Classical and Quantum Gravity | null | 10.1088/1361-6382/ac33bd | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A manifestly Lorentz-covariant formulation of Loop Quantum Gravity (LQG) is
given in terms of finite-dimensional representations of the Lorentz group. The
formulation accounts for discrete symmetries, such as parity and time-reversal,
and it establishes a link with Wigner classification of particles. The
resulting qu... | [
{
"created": "Sat, 27 Feb 2021 11:47:57 GMT",
"version": "v1"
},
{
"created": "Sun, 20 Jun 2021 12:02:54 GMT",
"version": "v2"
},
{
"created": "Sat, 6 Nov 2021 11:49:44 GMT",
"version": "v3"
}
] | 2021-12-08 | [
[
"Cianfrani",
"Francesco",
""
]
] | A manifestly Lorentz-covariant formulation of Loop Quantum Gravity (LQG) is given in terms of finite-dimensional representations of the Lorentz group. The formulation accounts for discrete symmetries, such as parity and time-reversal, and it establishes a link with Wigner classification of particles. The resulting quan... |
2202.08412 | Vesselin G. Gueorguiev | Vesselin G. Gueorguiev and Andre Maeder | The Scale Invariant Vacuum Paradigm: main results and current progress | 10 pages, 3 figures, summary of the talk presented at the conference
Alternative Gravities and Fundamental Cosmology, Organized by the University
of Szczecin, Poland, 6-10 September 2021 | null | 10.3390/universe8040213 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a summary of the main results within the Scale Invariant Vacuum
(SIV) paradigm as related to the Weyl Integrable Geometry. After a brief review
of the mathematical framework, we will highlight the main results related to
inflation within the SIV [9], the growth of the density fluctuations [8], and
the appl... | [
{
"created": "Thu, 17 Feb 2022 02:27:07 GMT",
"version": "v1"
}
] | 2022-03-30 | [
[
"Gueorguiev",
"Vesselin G.",
""
],
[
"Maeder",
"Andre",
""
]
] | We present a summary of the main results within the Scale Invariant Vacuum (SIV) paradigm as related to the Weyl Integrable Geometry. After a brief review of the mathematical framework, we will highlight the main results related to inflation within the SIV [9], the growth of the density fluctuations [8], and the applic... |
1010.5723 | Thomas W. Baumgarte | Kenneth A. Dennison, John P. Wendell, Thomas W. Baumgarte and J. David
Brown | Trumpet slices of the Schwarzschild-Tangherlini spacetime | 11 pages, 6 figures, submitted to PRD | Phys.Rev.D82:124057,2010 | 10.1103/PhysRevD.82.124057 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study families of time-independent maximal and 1+log foliations of the
Schwarzschild-Tangherlini spacetime, the spherically-symmetric vacuum black
hole solution in D spacetime dimensions, for D >= 4. We identify special
members of these families for which the spatial slices display a trumpet
geometry. Using a gene... | [
{
"created": "Wed, 27 Oct 2010 15:57:13 GMT",
"version": "v1"
}
] | 2011-01-20 | [
[
"Dennison",
"Kenneth A.",
""
],
[
"Wendell",
"John P.",
""
],
[
"Baumgarte",
"Thomas W.",
""
],
[
"Brown",
"J. David",
""
]
] | We study families of time-independent maximal and 1+log foliations of the Schwarzschild-Tangherlini spacetime, the spherically-symmetric vacuum black hole solution in D spacetime dimensions, for D >= 4. We identify special members of these families for which the spatial slices display a trumpet geometry. Using a genera... |
1406.6475 | Yongwan Gim | Yongwan Gim and Wontae Kim | Thermodynamic phase transition in the rainbow Schwarzschild black hole | 14pages, 6figures, version to appear in JCAP | JCAP, 10 (2014) 003 | 10.1088/1475-7516/2014/10/003 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the thermodynamic phase transition in the rainbow Schwarzschild
black hole where the metric depends on the energy of the test particle.
Identifying the black hole temperature with the energy from the modified
dispersion relation, we obtain the modified entropy and thermodynamic energy
along with the modified... | [
{
"created": "Wed, 25 Jun 2014 06:56:16 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Oct 2014 06:31:17 GMT",
"version": "v2"
}
] | 2014-10-03 | [
[
"Gim",
"Yongwan",
""
],
[
"Kim",
"Wontae",
""
]
] | We study the thermodynamic phase transition in the rainbow Schwarzschild black hole where the metric depends on the energy of the test particle. Identifying the black hole temperature with the energy from the modified dispersion relation, we obtain the modified entropy and thermodynamic energy along with the modified l... |
gr-qc/9708009 | Boris N. Frolov | O. V. Babourova, B. N. Frolov (Department of Mathematics, Moscow State
Pedagogical University) | Perfect fluid and test particle with spin and dilatonic charge in a
Weyl-Cartan space | 25 July 1997. - 9 p. Some corrections in the text and formulars (2.4)
and (2.8) are perfomed, the results being unchanged | Mod.Phys.Lett. A13 (1998) 7-14 | 10.1142/S0217732398000036 | null | gr-qc | null | The equation of perfect dilaton-spin fluid motion in the form of generalized
hydrodynamic Euler-type equation in a Weyl-Cartan space is derived. The
equation of motion of a test particle with spin and dilatonic charge in the
Weyl-Cartan geometry background is obtained. The peculiarities of test particle
motion in a W... | [
{
"created": "Tue, 5 Aug 1997 18:36:19 GMT",
"version": "v1"
},
{
"created": "Mon, 26 Jan 1998 23:57:02 GMT",
"version": "v2"
}
] | 2009-10-30 | [
[
"Babourova",
"O. V.",
"",
"Department of Mathematics, Moscow State\n Pedagogical University"
],
[
"Frolov",
"B. N.",
"",
"Department of Mathematics, Moscow State\n Pedagogical University"
]
] | The equation of perfect dilaton-spin fluid motion in the form of generalized hydrodynamic Euler-type equation in a Weyl-Cartan space is derived. The equation of motion of a test particle with spin and dilatonic charge in the Weyl-Cartan geometry background is obtained. The peculiarities of test particle motion in a Wey... |
1209.5738 | Mayeul Arminjon | Mayeul Arminjon | Summary of a non-uniqueness problem of the covariant Dirac theory and of
two solutions of it | 16 pages in standard 12pt. v2: misprint fixed in Eq (20). Text of a
talk given at the 14th International Conference on Geometry, Integrability
and Quantization (Varna, Bulgaria, June 2012) | Proc. Int. Conf. "Geometry, Integrability and Quantization XIV",
ed. by Iva\"ilo Mladenov, Andrei Ludu & Akira Yoshioka; Avangard Prima, Sofia
(2013), pp 48-60 | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a summary of: 1) the non-uniqueness problem of the Hamiltonian and
energy operators associated, in any given coordinate system, with the
generally-covariant Dirac equation; 2) two different ways to restrict the gauge
freedom so as to solve that problem; 3) the application of these two ways to
the case of a... | [
{
"created": "Tue, 25 Sep 2012 08:38:15 GMT",
"version": "v1"
},
{
"created": "Mon, 15 Oct 2012 13:54:20 GMT",
"version": "v2"
}
] | 2013-07-05 | [
[
"Arminjon",
"Mayeul",
""
]
] | We present a summary of: 1) the non-uniqueness problem of the Hamiltonian and energy operators associated, in any given coordinate system, with the generally-covariant Dirac equation; 2) two different ways to restrict the gauge freedom so as to solve that problem; 3) the application of these two ways to the case of a u... |
2112.05915 | Hongxing Zhang | Hongxing Zhang, Naying Zhou, Wenfang Liu, Xin Wu | Charged particle motions near non-Schwarzschild black holes with
external magnetic fields in modified theories of gravity | 27 pages, 14 figures | null | 10.3390/universe7120488 | null | gr-qc physics.comp-ph | http://creativecommons.org/licenses/by-nc-sa/4.0/ | A small deformation controlled by four free parameters to the Schwarzschild
metric could be referred to a nonspinning black hole solution in alternative
theories of gravity. Because such a non-Schwarzschild metric can be changed
into a Kerr-like black hole metric via a complex coordinate transformation, the
recently ... | [
{
"created": "Sat, 11 Dec 2021 05:04:32 GMT",
"version": "v1"
}
] | 2021-12-14 | [
[
"Zhang",
"Hongxing",
""
],
[
"Zhou",
"Naying",
""
],
[
"Liu",
"Wenfang",
""
],
[
"Wu",
"Xin",
""
]
] | A small deformation controlled by four free parameters to the Schwarzschild metric could be referred to a nonspinning black hole solution in alternative theories of gravity. Because such a non-Schwarzschild metric can be changed into a Kerr-like black hole metric via a complex coordinate transformation, the recently pr... |
1704.01986 | Dejan Stojkovic | De-Chang Dai and Dejan Stojkovic | Maximal temperature of the gas in AdS space-time | Published in Phys.Rev. D95 (2017) no.8, 085015 | Phys.Rev. D95 (2017) no.8, 085015 | 10.1103/PhysRevD.95.085015 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming only statistical mechanics and general relativity, we calculate the
maximal temperature of gas of particles placed in AdS space-time. If two
particles with a given center of mass energy come close enough, according to
classical gravity they will form a black hole. We focus only on the black holes
with Hawkin... | [
{
"created": "Thu, 6 Apr 2017 18:38:24 GMT",
"version": "v1"
},
{
"created": "Wed, 3 May 2017 15:36:53 GMT",
"version": "v2"
}
] | 2017-05-08 | [
[
"Dai",
"De-Chang",
""
],
[
"Stojkovic",
"Dejan",
""
]
] | Assuming only statistical mechanics and general relativity, we calculate the maximal temperature of gas of particles placed in AdS space-time. If two particles with a given center of mass energy come close enough, according to classical gravity they will form a black hole. We focus only on the black holes with Hawking ... |
0802.0393 | Alexander Dietz | Alexander Dietz (for the LIGO Scientific Collaboration) | GRB-triggered searches for gravitational waves in LIGO data | 5 pages, 3 figures, contributed talk, submitted to the proceedings of
Gamma Ray Bursts 2007, Santa Fe, New Mexico, November 5-9 2007 | AIP Conf.Proc.1000:284-288,2008 | 10.1063/1.2943464 | null | gr-qc astro-ph | null | The LIGO gravitational wave detectors have recently reached their design
sensitivity and finished a two-year science run. During this period one year of
data with unprecedented sensitivity has been collected. I will briefly describe
the status of the LIGO detectors and the overall quality of the most recent
science r... | [
{
"created": "Mon, 4 Feb 2008 12:21:14 GMT",
"version": "v1"
}
] | 2019-08-13 | [
[
"Dietz",
"Alexander",
"",
"for the LIGO Scientific Collaboration"
]
] | The LIGO gravitational wave detectors have recently reached their design sensitivity and finished a two-year science run. During this period one year of data with unprecedented sensitivity has been collected. I will briefly describe the status of the LIGO detectors and the overall quality of the most recent science run... |
gr-qc/0404019 | Bogusz Kinasiewicz | Bogusz Kinasiewicz and Tomasz Lanczewski | Comparison of Two Stationary Spherical Accretion Models | 12 pages, 9 figures | Acta Phys.Polon. B36 (2005) 1951-1962 | null | null | gr-qc | null | The general relativistic accretion onto a black hole is investigated in which
the motion is steady and spherically symmetrical, the gas being at rest at
infinity. Two models with different equations of state are compared. Numerical
calculations show that the predictions of the models are similar in most
aspects. In t... | [
{
"created": "Tue, 6 Apr 2004 11:42:13 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Kinasiewicz",
"Bogusz",
""
],
[
"Lanczewski",
"Tomasz",
""
]
] | The general relativistic accretion onto a black hole is investigated in which the motion is steady and spherically symmetrical, the gas being at rest at infinity. Two models with different equations of state are compared. Numerical calculations show that the predictions of the models are similar in most aspects. In the... |
0803.4489 | Kostyantyn Ropotenko | Kostyantyn Ropotenko | Can the fluctuations of a black hole be treated thermodynamically? | 9 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Since the temperature of a typical Schwarzschild black hole is very low, some
doubts are raised about whether the fluctuations of the black hole can be
treated thermodynamically. It is shown that this is not the case: the
thermodynamic fluctuations of a black hole are considerably larger than the
corresponding quantu... | [
{
"created": "Mon, 31 Mar 2008 16:10:03 GMT",
"version": "v1"
}
] | 2008-04-01 | [
[
"Ropotenko",
"Kostyantyn",
""
]
] | Since the temperature of a typical Schwarzschild black hole is very low, some doubts are raised about whether the fluctuations of the black hole can be treated thermodynamically. It is shown that this is not the case: the thermodynamic fluctuations of a black hole are considerably larger than the corresponding quantum ... |
0706.1305 | Sascha Husa | Mark Hannam, Sascha Husa, Jose A. Gonzalez, Ulrich Sperhake, Bernd
Bruegmann | Where post-Newtonian and numerical-relativity waveforms meet | 14 pages, 18 figures. Modifications resulting from bug fixes in LAL,
and extended analysis of numerical errors and phase agreement with PN, now
including the 3PN TaylorT3 approximant. No change to main conclusions | Phys.Rev.D77:044020,2008 | 10.1103/PhysRevD.77.044020 | null | gr-qc | null | We analyze numerical-relativity (NR) waveforms that cover nine orbits (18
gravitational-wave cycles) before merger of an equal-mass system with low
eccentricity, with numerical uncertainties of 0.25 radians in the phase and
less than 2% in the amplitude; such accuracy allows a direct comparison with
post-Newtonian (P... | [
{
"created": "Mon, 11 Jun 2007 17:26:32 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Oct 2007 10:38:11 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Hannam",
"Mark",
""
],
[
"Husa",
"Sascha",
""
],
[
"Gonzalez",
"Jose A.",
""
],
[
"Sperhake",
"Ulrich",
""
],
[
"Bruegmann",
"Bernd",
""
]
] | We analyze numerical-relativity (NR) waveforms that cover nine orbits (18 gravitational-wave cycles) before merger of an equal-mass system with low eccentricity, with numerical uncertainties of 0.25 radians in the phase and less than 2% in the amplitude; such accuracy allows a direct comparison with post-Newtonian (PN)... |
1709.09035 | Albert V. Minkevich | A.V. Minkevich | Torsion and gravitational interaction in Riemann-Cartan space-time | arXiv admin note: text overlap with arXiv:1704.06077 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The influence of space-time torsion on gravitational interaction at
cosmological and astrophysical scales is discussed within the framework of
gauge gravitation theory in Riemann-Cartan space-time. It is shown that the
interaction of the vacuum torsion with proper angular momentums of gravitating
objects leads to app... | [
{
"created": "Sun, 24 Sep 2017 11:37:47 GMT",
"version": "v1"
}
] | 2017-09-27 | [
[
"Minkevich",
"A. V.",
""
]
] | The influence of space-time torsion on gravitational interaction at cosmological and astrophysical scales is discussed within the framework of gauge gravitation theory in Riemann-Cartan space-time. It is shown that the interaction of the vacuum torsion with proper angular momentums of gravitating objects leads to appea... |
2003.12887 | Andrea Geralico | Donato Bini, Andrea Geralico, Jan Steinhoff | Detweiler's redshift invariant for extended bodies orbiting a
Schwarzschild black hole | 18 pages, revtex macros | Phys. Rev. D 102, 024091 (2020) | 10.1103/PhysRevD.102.024091 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We compute the first-order self-force contribution to Detweiler's redshift
invariant for extended bodies endowed with both dipolar and quadrupolar
structure (with spin-induced quadrupole moment) moving along circular orbits on
a Schwarzschild background. Our analysis includes effects which are second
order in spin, g... | [
{
"created": "Sat, 28 Mar 2020 20:59:22 GMT",
"version": "v1"
}
] | 2020-08-05 | [
[
"Bini",
"Donato",
""
],
[
"Geralico",
"Andrea",
""
],
[
"Steinhoff",
"Jan",
""
]
] | We compute the first-order self-force contribution to Detweiler's redshift invariant for extended bodies endowed with both dipolar and quadrupolar structure (with spin-induced quadrupole moment) moving along circular orbits on a Schwarzschild background. Our analysis includes effects which are second order in spin, gen... |
gr-qc/0512040 | Ruslan Vaulin | Arkady Kheyfets, Warner A. Miller and Ruslan Vaulin | Quantum Geometrodynamics of the Bianchi IX cosmological model | 25 pages, submitted to Class.Quant.Gravity | Class.Quant.Grav. 23 (2006) 4333-4352 | 10.1088/0264-9381/23/13/003 | null | gr-qc | null | The canonical quantum theory of gravity -- Quantum Geometrodynamics (QG) is
applied to the homogeneous Bianchi type IX cosmological model. As a result, the
framework for the quantum theory of homogeneous cosmologies is developed. We
show that the theory is internally consistent, and prove that it possesses the
correc... | [
{
"created": "Tue, 6 Dec 2005 18:44:27 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Kheyfets",
"Arkady",
""
],
[
"Miller",
"Warner A.",
""
],
[
"Vaulin",
"Ruslan",
""
]
] | The canonical quantum theory of gravity -- Quantum Geometrodynamics (QG) is applied to the homogeneous Bianchi type IX cosmological model. As a result, the framework for the quantum theory of homogeneous cosmologies is developed. We show that the theory is internally consistent, and prove that it possesses the correct ... |
gr-qc/0503039 | Wu Ning | Ning Wu | Classical Gravitational Interactions and Gravitational Lorentz Force | 8 pages, no figure | Commun.Theor.Phys.44:883-886,2005 | 10.1088/6102/44/5/883 | null | gr-qc | null | In quantum gauge theory of gravity, the gravitational field is represented by
gravitational gauge field. The field strength of gravitational gauge field has
both gravitational electric component and gravitational magnetic component. In
classical level, gauge theory of gravity gives out classical Newtonian
gravitation... | [
{
"created": "Wed, 9 Mar 2005 18:43:14 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Apr 2005 15:15:33 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Wu",
"Ning",
""
]
] | In quantum gauge theory of gravity, the gravitational field is represented by gravitational gauge field. The field strength of gravitational gauge field has both gravitational electric component and gravitational magnetic component. In classical level, gauge theory of gravity gives out classical Newtonian gravitational... |
2003.12171 | Alexander Zhidenko | R. A. Konoplya and A. Zhidenko | BTZ black holes with higher curvature corrections in the 3D
Einstein-Lovelock theory | 8 pages | Phys. Rev. D 102, 064004 (2020) | 10.1103/PhysRevD.102.064004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The regularization procedure for getting the four-dimensional nontrivial
Einstein-Gauss-Bonnet effective description of gravity and its Lovelock
generalization has been recently developed. Here we propose the regularization
for the three-dimensional gravity, which is based on the rescaling of the
coupling constants a... | [
{
"created": "Thu, 26 Mar 2020 22:22:38 GMT",
"version": "v1"
},
{
"created": "Thu, 3 Sep 2020 16:36:37 GMT",
"version": "v2"
}
] | 2020-09-04 | [
[
"Konoplya",
"R. A.",
""
],
[
"Zhidenko",
"A.",
""
]
] | The regularization procedure for getting the four-dimensional nontrivial Einstein-Gauss-Bonnet effective description of gravity and its Lovelock generalization has been recently developed. Here we propose the regularization for the three-dimensional gravity, which is based on the rescaling of the coupling constants and... |
1105.3950 | Alberto Saa | Alberto Saa and Raphael Santarelli | Destroying a near-extremal Kerr-Newman black hole | 5 pages, 2 figures. New references added, final version accepted for
publication in PRD | Phys.Rev.D84:027501,2011 | 10.1103/PhysRevD.84.027501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We revisit here a previous argument due to Wald showing the impossibility of
turning an extremal Kerr-Newman black hole into a naked singularity by plunging
test particles across the black hole event horizon. We extend Wald's analysis
to the case of near-extremal black holes and show that it is indeed possible to
des... | [
{
"created": "Thu, 19 May 2011 18:09:08 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Jul 2011 17:10:19 GMT",
"version": "v2"
}
] | 2011-08-08 | [
[
"Saa",
"Alberto",
""
],
[
"Santarelli",
"Raphael",
""
]
] | We revisit here a previous argument due to Wald showing the impossibility of turning an extremal Kerr-Newman black hole into a naked singularity by plunging test particles across the black hole event horizon. We extend Wald's analysis to the case of near-extremal black holes and show that it is indeed possible to destr... |
2312.07426 | Mehrab Momennia | Mehrab Momennia, Pritam Banerjee, Alfredo Herrera-Aguilar, Ulises
Nucamendi | Schwarzschild black hole and redshift rapidity: A new approach towards
measuring cosmic distances | 9 pages with 3 captioned figures. Comments are welcome; V2: 14 pages
with 6 captioned figures, Published version | Eur. Phys. J. C 84 (2024) 583 | 10.1140/epjc/s10052-024-12933-0 | null | gr-qc astro-ph.CO astro-ph.GA | http://creativecommons.org/licenses/by/4.0/ | Motivated by recent achievements of a full general relativistic method in
estimating the mass-to-distance ratio of supermassive black holes hosted at the
core of active galactic nuclei, we introduce the new concept redshift rapidity
in order to express the Schwarzschild black hole mass and its distance from the
Earth... | [
{
"created": "Tue, 12 Dec 2023 16:50:44 GMT",
"version": "v1"
},
{
"created": "Mon, 10 Jun 2024 00:20:52 GMT",
"version": "v2"
}
] | 2024-06-11 | [
[
"Momennia",
"Mehrab",
""
],
[
"Banerjee",
"Pritam",
""
],
[
"Herrera-Aguilar",
"Alfredo",
""
],
[
"Nucamendi",
"Ulises",
""
]
] | Motivated by recent achievements of a full general relativistic method in estimating the mass-to-distance ratio of supermassive black holes hosted at the core of active galactic nuclei, we introduce the new concept redshift rapidity in order to express the Schwarzschild black hole mass and its distance from the Earth j... |
2404.14569 | Wenxuan Jia | Wenxuan Jia, Victoria Xu, Kevin Kuns, Masayuki Nakano, Lisa Barsotti,
Matthew Evans, Nergis Mavalvala, Rich Abbott, Ibrahim Abouelfettouh, Rana
Adhikari, Alena Ananyeva, Stephen Appert, Koji Arai, Naoki Aritomi, Stuart
Aston, Matthew Ball, Stefan Ballmer, David Barker, Beverly Berger, Joseph
Betzwieser, Dripta ... | LIGO operates with quantum noise below the Standard Quantum Limit | null | null | null | LIGO-P2400059 | gr-qc astro-ph.IM physics.ins-det quant-ph | http://creativecommons.org/licenses/by-nc-nd/4.0/ | Precision measurements of space and time, like those made by the detectors of
the Laser Interferometer Gravitational-wave Observatory (LIGO), are often
confronted with fundamental limitations imposed by quantum mechanics. The
Heisenberg uncertainty principle dictates that the position and momentum of an
object cannot... | [
{
"created": "Mon, 22 Apr 2024 20:32:18 GMT",
"version": "v1"
}
] | 2024-04-24 | [
[
"Jia",
"Wenxuan",
""
],
[
"Xu",
"Victoria",
""
],
[
"Kuns",
"Kevin",
""
],
[
"Nakano",
"Masayuki",
""
],
[
"Barsotti",
"Lisa",
""
],
[
"Evans",
"Matthew",
""
],
[
"Mavalvala",
"Nergis",
""
],
[
"Abb... | Precision measurements of space and time, like those made by the detectors of the Laser Interferometer Gravitational-wave Observatory (LIGO), are often confronted with fundamental limitations imposed by quantum mechanics. The Heisenberg uncertainty principle dictates that the position and momentum of an object cannot b... |
2407.15190 | Allan Ranieri Pereira Moreira | Allan R. P. Moreira, Shi-Hai Dong, and Emmanuel N. Saridakis | Information measures for fermion localization in $f(T, B)$ gravity with
non-minimal couplings | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the dynamics of fermion localization within the framework of
$f(T, B)$ gravity featuring non-minimal couplings. Starting from the Dirac
action for a spin-$1/2$ fermion in a five-dimensional spacetime governed by
torsional $f(T, B)$ gravity, we derive the Dirac equation and we explore its
solutions unde... | [
{
"created": "Sun, 21 Jul 2024 15:07:44 GMT",
"version": "v1"
}
] | 2024-07-23 | [
[
"Moreira",
"Allan R. P.",
""
],
[
"Dong",
"Shi-Hai",
""
],
[
"Saridakis",
"Emmanuel N.",
""
]
] | We investigate the dynamics of fermion localization within the framework of $f(T, B)$ gravity featuring non-minimal couplings. Starting from the Dirac action for a spin-$1/2$ fermion in a five-dimensional spacetime governed by torsional $f(T, B)$ gravity, we derive the Dirac equation and we explore its solutions under ... |
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