id stringlengths 9 13 | submitter stringlengths 1 64 ⌀ | authors stringlengths 5 22.9k | title stringlengths 4 245 | comments stringlengths 1 548 ⌀ | journal-ref stringlengths 4 362 ⌀ | doi stringlengths 12 82 ⌀ | report-no stringlengths 2 281 ⌀ | categories stringclasses 793
values | license stringclasses 9
values | orig_abstract stringlengths 24 1.95k | versions listlengths 1 30 | update_date stringlengths 10 10 | authors_parsed listlengths 1 1.74k | abstract stringlengths 21 1.95k |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0806.3666 | Narayan Banerjee | Sudipta Das, Narayan Banerjee | Can neutrino viscosity drive the late time cosmic acceleration? | 8 pages, 3 figures | null | 10.1007/s10773-012-1152-4 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper it has been shown that the neutrino bulk viscous stresses can
give rise to the late time acceleration of the universe. It is found that a
number of spatially flat FRW models with a negative deceleration parameter can
be constructed using neutrino viscosity and one of them mimics a $\Lambda$CDM
model. Th... | [
{
"created": "Mon, 23 Jun 2008 12:22:10 GMT",
"version": "v1"
}
] | 2015-05-13 | [
[
"Das",
"Sudipta",
""
],
[
"Banerjee",
"Narayan",
""
]
] | In this paper it has been shown that the neutrino bulk viscous stresses can give rise to the late time acceleration of the universe. It is found that a number of spatially flat FRW models with a negative deceleration parameter can be constructed using neutrino viscosity and one of them mimics a $\Lambda$CDM model. This... |
gr-qc/0306102 | Bartolome Coll | Bartolom\'e Coll and Joan Josep Ferrando | On the Leibniz bracket, the Schouten bracket and the Laplacian | null | J.Math.Phys.45:2405-2410,2004 | 10.1063/1.1738188 | null | gr-qc | null | The Leibniz bracket of an operator on a (graded) algebra is defined and some
of its properties are studied. A basic theorem relating the Leibniz bracket of
the commutator of two operators to the Leibniz bracket of them, is obtained.
Under some natural conditions, the Leibniz bracket gives rise to a (graded) Lie
algeb... | [
{
"created": "Sun, 22 Jun 2003 15:47:23 GMT",
"version": "v1"
}
] | 2011-07-19 | [
[
"Coll",
"Bartolomé",
""
],
[
"Ferrando",
"Joan Josep",
""
]
] | The Leibniz bracket of an operator on a (graded) algebra is defined and some of its properties are studied. A basic theorem relating the Leibniz bracket of the commutator of two operators to the Leibniz bracket of them, is obtained. Under some natural conditions, the Leibniz bracket gives rise to a (graded) Lie algebra... |
2106.13824 | Alejandro Cabo | Alejandro Cabo Montes de Oca, Duvier Suarez Fontanella and David
Valls-Gabaud | Dynamical gravastars from the interaction between scalar fields and
matter | 12 pages, 8 figures | null | 10.1140/epjc/s10052-021-09726-0 | null | gr-qc astro-ph.GA hep-th | http://creativecommons.org/licenses/by/4.0/ | Gravastars are configurations of compact singularity-free gravitational
objects which are interesting alternatives to classical solutions in the strong
gravitational field regime. Although there are no static star-like solutions of
the Einstein-Klein-Gordon equations for real scalar fields, we show that
dynamical gra... | [
{
"created": "Fri, 25 Jun 2021 18:00:43 GMT",
"version": "v1"
}
] | 2021-11-03 | [
[
"de Oca",
"Alejandro Cabo Montes",
""
],
[
"Fontanella",
"Duvier Suarez",
""
],
[
"Valls-Gabaud",
"David",
""
]
] | Gravastars are configurations of compact singularity-free gravitational objects which are interesting alternatives to classical solutions in the strong gravitational field regime. Although there are no static star-like solutions of the Einstein-Klein-Gordon equations for real scalar fields, we show that dynamical grava... |
1403.3653 | Jose Antonio Font | Nicolas Sanchis-Gual (Valencia), Pedro J. Montero (MPA), Jose A. Font
(Valencia), Ewald Mueller (MPA), Thomas W. Baumgarte (Bowdoin College) | Fully covariant and conformal formulation of the Z4 system in a
reference-metric approach: comparison with the BSSN formulation in spherical
symmetry | 13 pages, 10 figures | null | 10.1103/PhysRevD.89.104033 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We adopt a reference-metric approach to generalize a covariant and conformal
version of the Z4 system of the Einstein equations. We refer to the resulting
system as ``fully covariant and conformal", or fCCZ4 for short, since it is
well suited for curvilinear as well as Cartesian coordinates. We implement this
fCCZ4 f... | [
{
"created": "Fri, 14 Mar 2014 17:41:17 GMT",
"version": "v1"
}
] | 2015-06-19 | [
[
"Sanchis-Gual",
"Nicolas",
"",
"Valencia"
],
[
"Montero",
"Pedro J.",
"",
"MPA"
],
[
"Font",
"Jose A.",
"",
"Valencia"
],
[
"Mueller",
"Ewald",
"",
"MPA"
],
[
"Baumgarte",
"Thomas W.",
"",
"Bowdoin College"
]
] | We adopt a reference-metric approach to generalize a covariant and conformal version of the Z4 system of the Einstein equations. We refer to the resulting system as ``fully covariant and conformal", or fCCZ4 for short, since it is well suited for curvilinear as well as Cartesian coordinates. We implement this fCCZ4 for... |
1509.07970 | Luis Herrera | L. Herrera, A. Di Prisco, J. Ospino, J. Carot | Axially symmetric dissipative fluids in the quasi--static approximation | 10 pages. arXiv admin note: text overlap with arXiv:1404.1176. Some
typos corrected. To appear in Int.J.Mod.Phys.D | Int.J.Mod.Phys.D25, 1650036, (2016) | 10.1142/S021827181650036X | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using a framework based on the $1+3$ formalism we carry out a study on
axially and reflection symmetric dissipative fluids, in the quasi--static
regime. We first derive a set of invariantly defined "velocities", which allow
for an inambiguous definition of the quasi--static approximation. Next we
rewrite all the rele... | [
{
"created": "Sat, 26 Sep 2015 12:10:36 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Dec 2015 15:03:12 GMT",
"version": "v2"
}
] | 2016-03-08 | [
[
"Herrera",
"L.",
""
],
[
"Di Prisco",
"A.",
""
],
[
"Ospino",
"J.",
""
],
[
"Carot",
"J.",
""
]
] | Using a framework based on the $1+3$ formalism we carry out a study on axially and reflection symmetric dissipative fluids, in the quasi--static regime. We first derive a set of invariantly defined "velocities", which allow for an inambiguous definition of the quasi--static approximation. Next we rewrite all the releva... |
2205.10853 | Wan Mohamad Husni Wan Mokhtar | Wan Mohamad Husni Wan Mokhtar, Jorma Louko | The cost of building a wall for a fermion | 31 pages, no figure. v2: Typos corrected. Published version | J. High Energ. Phys. 2022, 69 (2022) | 10.1007/JHEP08(2022)069 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyse the energy cost of building or demolishing a wall for a massless
Dirac field in (1+1)-dimensional Minkowski spacetime and the response of an
Unruh-DeWitt particle detector to the generated radiation. For any
smoothly-evolving wall, both the field's energy density and the detector's
response are finite. In ... | [
{
"created": "Sun, 22 May 2022 15:31:23 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Aug 2022 15:26:49 GMT",
"version": "v2"
}
] | 2022-08-11 | [
[
"Mokhtar",
"Wan Mohamad Husni Wan",
""
],
[
"Louko",
"Jorma",
""
]
] | We analyse the energy cost of building or demolishing a wall for a massless Dirac field in (1+1)-dimensional Minkowski spacetime and the response of an Unruh-DeWitt particle detector to the generated radiation. For any smoothly-evolving wall, both the field's energy density and the detector's response are finite. In th... |
1105.1898 | Carlo Rovelli | Eugenio Bianchi and Carlo Rovelli | A note on the geometrical interpretation of quantum groups and
non-commutative spaces in gravity | 2 pages, 1 figure | Phys.Rev.D84:027502,2011 | 10.1103/PhysRevD.84.027502 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum groups and non-commutative spaces have been repeatedly utilized in
approaches to quantum gravity. They provide a mathematically elegant cut-off,
often interpreted as related to the Planck-scale quantum uncertainty in
position. We consider here a different geometrical interpretation of this
cut-off, where the ... | [
{
"created": "Tue, 10 May 2011 10:10:25 GMT",
"version": "v1"
},
{
"created": "Fri, 13 May 2011 09:24:21 GMT",
"version": "v2"
}
] | 2011-08-09 | [
[
"Bianchi",
"Eugenio",
""
],
[
"Rovelli",
"Carlo",
""
]
] | Quantum groups and non-commutative spaces have been repeatedly utilized in approaches to quantum gravity. They provide a mathematically elegant cut-off, often interpreted as related to the Planck-scale quantum uncertainty in position. We consider here a different geometrical interpretation of this cut-off, where the re... |
gr-qc/0404085 | K. G. Arun | K G Arun, Luc Blanchet, Bala R Iyer and Moh'd S S Qusailah | The 2.5PN gravitational wave polarisations from inspiralling compact
binaries in circular orbits | 45 pages, version which includes the correction of an Erratum to be
published in Class. Quant. Grav. (2005) | Class.Quant.Grav.21:3771-3802,2004; Erratum-ibid.22:3115,2005 | 10.1088/0264-9381/21/15/010 | null | gr-qc | null | Using the multipolar post-Minkowskian and matching formalism we compute the
gravitational waveform of inspiralling compact binaries moving in
quasi-circular orbits at the second and a half post-Newtonian (2.5PN)
approximation to general relativity. The inputs we use include notably the
mass-type quadrupole at the 2.5... | [
{
"created": "Tue, 20 Apr 2004 11:31:36 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Jun 2004 04:06:04 GMT",
"version": "v2"
},
{
"created": "Sat, 17 Jul 2004 09:35:58 GMT",
"version": "v3"
},
{
"created": "Fri, 27 May 2005 15:09:05 GMT",
"version": "v4"
}
] | 2014-11-17 | [
[
"Arun",
"K G",
""
],
[
"Blanchet",
"Luc",
""
],
[
"Iyer",
"Bala R",
""
],
[
"Qusailah",
"Moh'd S S",
""
]
] | Using the multipolar post-Minkowskian and matching formalism we compute the gravitational waveform of inspiralling compact binaries moving in quasi-circular orbits at the second and a half post-Newtonian (2.5PN) approximation to general relativity. The inputs we use include notably the mass-type quadrupole at the 2.5PN... |
2112.02585 | Daniele Oriti | Daniele Oriti | Tensorial Group Field Theory condensate cosmology as an example of
spacetime emergence in quantum gravity | 28 pages, 3 figures. Contribution to the volume "The Foundations of
Spacetime Physics: Philosophical Perspectives", edited by A. Vassallo, to be
published in the "Routledge Studies in the Philosophy of Mathematics and
Physics" series; v2: several clarifications added, discussion improved, typos
corrected, a few... | null | null | null | gr-qc hep-th physics.hist-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We summarize the main ideas behind TGFT condensate cosmology and sketch the
technical steps that bring from the fundamental theory to the effective
cosmological dynamics. This framework is presented as an explicit illustration
of (and possibly a general template for) the emergence of spacetime from
non-spatiotemporal... | [
{
"created": "Sun, 5 Dec 2021 14:40:49 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Feb 2022 21:10:21 GMT",
"version": "v2"
}
] | 2022-02-10 | [
[
"Oriti",
"Daniele",
""
]
] | We summarize the main ideas behind TGFT condensate cosmology and sketch the technical steps that bring from the fundamental theory to the effective cosmological dynamics. This framework is presented as an explicit illustration of (and possibly a general template for) the emergence of spacetime from non-spatiotemporal q... |
2211.00300 | Mohsen Khodadi | Mohsen Khodadi | Shadow of black hole surrounded by magnetized plasma: Axion-plasmon
cloud | 23 pages, 15 figures, for publication in " Nuclear Physics B" | Nuclear Physics B 985 (2022) 116014 | 10.1016/j.nuclphysb.2022.116014 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By exploiting the extreme environment of the black hole (BH) as a potential
place for axion-photon interaction, we use an axion-producing model of the
magnetized plasma to study the shadow of an asymptotically flat rotating BH
immersed into an axion-plasmon cloud. By aiming to reveal footprints of axion
in the dark s... | [
{
"created": "Tue, 1 Nov 2022 06:37:40 GMT",
"version": "v1"
}
] | 2022-11-09 | [
[
"Khodadi",
"Mohsen",
""
]
] | By exploiting the extreme environment of the black hole (BH) as a potential place for axion-photon interaction, we use an axion-producing model of the magnetized plasma to study the shadow of an asymptotically flat rotating BH immersed into an axion-plasmon cloud. By aiming to reveal footprints of axion in the dark sha... |
1204.4907 | Ricardo E. Gamboa Saravi | Ricardo E. Gamboa Saravi | Higher-dimensional perfect fluids and empty singular boundaries | 16 pages | Gen.Rel.Grav. 44 (2012) 1769-1786 | 10.1007/s10714-012-1366-z | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In order to find out whether empty singular boundaries can arise in higher
dimensional Gravity, we study the solution of Einstein's equations consisting
in a ($N+2$)-dimensional static and hyperplane symmetric perfect fluid
satisfying the equation of state $\rho=\eta\, p$, being $\rho$ an arbitrary
constant and $N\ge... | [
{
"created": "Sun, 22 Apr 2012 16:15:38 GMT",
"version": "v1"
}
] | 2012-08-21 | [
[
"Saravi",
"Ricardo E. Gamboa",
""
]
] | In order to find out whether empty singular boundaries can arise in higher dimensional Gravity, we study the solution of Einstein's equations consisting in a ($N+2$)-dimensional static and hyperplane symmetric perfect fluid satisfying the equation of state $\rho=\eta\, p$, being $\rho$ an arbitrary constant and $N\geq2... |
0901.4974 | Peter Phillips | Peter R. Phillips | Connecting the very large and the very small: effective particle mass in
curved-space cosmological models | null | null | 10.1111/j.1365-2966.2009.14580.x | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the propagation of electromagnetic fields and potentials in
the plasma of the early Universe, assuming a Friedmann-Robertson-Walker
background with negative curvature. Taking over results from classical plasma
physics, we show that charged particles will acquire an effective mass that has
not only the ... | [
{
"created": "Fri, 30 Jan 2009 20:52:55 GMT",
"version": "v1"
}
] | 2009-11-13 | [
[
"Phillips",
"Peter R.",
""
]
] | We investigate the propagation of electromagnetic fields and potentials in the plasma of the early Universe, assuming a Friedmann-Robertson-Walker background with negative curvature. Taking over results from classical plasma physics, we show that charged particles will acquire an effective mass that has not only the ex... |
1501.04951 | Jan Steinhoff | Jan Steinhoff | Spin gauge symmetry in the action principle for classical relativistic
particles | 9 pages, 1 figure | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We suggest that the physically irrelevant choice of a representative
worldline of a relativistic spinning particle should correspond to a gauge
symmetry in an action approach. Using a canonical formalism in special
relativity, we identify a (first-class) spin gauge constraint, which generates
a shift of the worldline... | [
{
"created": "Tue, 20 Jan 2015 20:37:44 GMT",
"version": "v1"
}
] | 2015-01-21 | [
[
"Steinhoff",
"Jan",
""
]
] | We suggest that the physically irrelevant choice of a representative worldline of a relativistic spinning particle should correspond to a gauge symmetry in an action approach. Using a canonical formalism in special relativity, we identify a (first-class) spin gauge constraint, which generates a shift of the worldline t... |
1007.2976 | Jingbo Wang | Jingbo Wang | Holograph in noncommutative geometry: Part 1 | 9 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we consider the holograph principle emergent from
noncommutative geometry, based on the spectral action principle. We show that
under some appropriate conditions, the gravity theory on a manifold with
boundary could be equivalent to a gauge theory $SU(N)$ on the boundary. Then an
expression for $N$ wit... | [
{
"created": "Sun, 18 Jul 2010 07:35:54 GMT",
"version": "v1"
}
] | 2010-07-20 | [
[
"Wang",
"Jingbo",
""
]
] | In this paper, we consider the holograph principle emergent from noncommutative geometry, based on the spectral action principle. We show that under some appropriate conditions, the gravity theory on a manifold with boundary could be equivalent to a gauge theory $SU(N)$ on the boundary. Then an expression for $N$ with ... |
gr-qc/9507004 | null | Peter D. D'Eath and Giampiero Esposito | Local Boundary Conditions for the Dirac Operator and One-Loop Quantum
Cosmology | 50 pages, plain-tex, published in Physical Review D, volume 43, pages
3234-3248, year 1991 | Phys.Rev. D43 (1991) 3234-3248 | 10.1103/PhysRevD.43.3234 | DAMTP R-90/26 | gr-qc | null | This paper studies local boundary conditions for fermionic fields in quantum
cosmology, originally introduced by Breitenlohner, Freedman and Hawking for
gauged supergravity theories in anti-de Sitter space. For a spin-1/2 field the
conditions involve the normal to the boundary and the undifferentiated field. A
first-... | [
{
"created": "Tue, 4 Jul 1995 06:12:30 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"D'Eath",
"Peter D.",
""
],
[
"Esposito",
"Giampiero",
""
]
] | This paper studies local boundary conditions for fermionic fields in quantum cosmology, originally introduced by Breitenlohner, Freedman and Hawking for gauged supergravity theories in anti-de Sitter space. For a spin-1/2 field the conditions involve the normal to the boundary and the undifferentiated field. A first-or... |
gr-qc/9811001 | Andrei V. Frolov | Andrei V. Frolov | Critical Collapse Beyond Spherical Symmetry: General Perturbations of
the Roberts Solution | RevTeX 3.1, 15 pages, 1 figure | Phys. Rev. D 59, 104011 (1999) | 10.1103/PhysRevD.59.104011 | null | gr-qc | null | This paper studies the non-spherical perturbations of the continuously
self-similar critical solution of the gravitational collapse of a massless
scalar field (the Roberts solution). The exact analysis of the perturbation
equations reveals that there are no growing non-spherical perturbation modes.
| [
{
"created": "Sun, 1 Nov 1998 04:37:46 GMT",
"version": "v1"
}
] | 2016-08-25 | [
[
"Frolov",
"Andrei V.",
""
]
] | This paper studies the non-spherical perturbations of the continuously self-similar critical solution of the gravitational collapse of a massless scalar field (the Roberts solution). The exact analysis of the perturbation equations reveals that there are no growing non-spherical perturbation modes. |
1707.03175 | Chen Songbai | Fen Long, Songbai Chen, Shangyun Wang, Jiliang Jing | Energy extraction from a Konoplya-Zhidenko rotating non-Kerr black hole | 14 pages, 6 figures | Nucl. Phys. B 926 (2018) 83-94 | 10.1016/j.nuclphysb.2017.10.028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have investigated the properties of the ergosphere and the energy
extraction by Penrose process in a Konoplya-Zhidenko rotating non-Kerr black
hole spacetime. We find that the ergosphere becomes thin and the maximum
efficiency of energy extraction decreases as the deformation parameter
increases. For the case with... | [
{
"created": "Tue, 11 Jul 2017 08:51:35 GMT",
"version": "v1"
}
] | 2017-11-15 | [
[
"Long",
"Fen",
""
],
[
"Chen",
"Songbai",
""
],
[
"Wang",
"Shangyun",
""
],
[
"Jing",
"Jiliang",
""
]
] | We have investigated the properties of the ergosphere and the energy extraction by Penrose process in a Konoplya-Zhidenko rotating non-Kerr black hole spacetime. We find that the ergosphere becomes thin and the maximum efficiency of energy extraction decreases as the deformation parameter increases. For the case with $... |
gr-qc/0401053 | Vladimir Khatsymovsky | V.M.Khatsymovsky | On the length expectation values in quantum Regge calculus | 11 pages, plain LaTeX | Phys.Lett. B586 (2004) 411-419 | 10.1016/j.physletb.2004.02.041 | null | gr-qc | null | Regge calculus configuration superspace can be embedded into a more general
superspace where the length of any edge is defined ambiguously depending on the
4-tetrahedron containing the edge. Moreover, the latter superspace can be
extended further so that even edge lengths in each the 4-tetrahedron are not
defined, on... | [
{
"created": "Tue, 13 Jan 2004 11:18:34 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Khatsymovsky",
"V. M.",
""
]
] | Regge calculus configuration superspace can be embedded into a more general superspace where the length of any edge is defined ambiguously depending on the 4-tetrahedron containing the edge. Moreover, the latter superspace can be extended further so that even edge lengths in each the 4-tetrahedron are not defined, only... |
1802.02130 | Mar\'ia Jos\'e Guzm\'an | Rafael Ferraro and Mar\'ia Jos\'e Guzm\'an | Hamiltonian formalism for f(T) gravity | 15 pages, no figures, comments welcome; references added; typos
corrected, matches the published version | Phys. Rev. D 97, 104028 (2018) | 10.1103/PhysRevD.97.104028 | null | gr-qc hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We present the Hamiltonian formalism for $f(T)$ gravity, and prove that the
theory has $\frac{n(n-3)}{2}+1$ degrees of freedom (d.o.f.) in $n$ dimensions.
We start from a scalar-tensor action for the theory, which represents a scalar
field minimally coupled with the torsion scalar $T$ that defines the
teleparallel eq... | [
{
"created": "Tue, 6 Feb 2018 18:50:20 GMT",
"version": "v1"
},
{
"created": "Tue, 20 Feb 2018 22:47:24 GMT",
"version": "v2"
},
{
"created": "Tue, 22 May 2018 22:34:52 GMT",
"version": "v3"
}
] | 2018-05-30 | [
[
"Ferraro",
"Rafael",
""
],
[
"Guzmán",
"María José",
""
]
] | We present the Hamiltonian formalism for $f(T)$ gravity, and prove that the theory has $\frac{n(n-3)}{2}+1$ degrees of freedom (d.o.f.) in $n$ dimensions. We start from a scalar-tensor action for the theory, which represents a scalar field minimally coupled with the torsion scalar $T$ that defines the teleparallel equi... |
gr-qc/0401048 | Peter Kuhfittig K. F. | Peter K.F. Kuhfittig | Can a wormhole supported by only small amounts of exotic matter really
be traversable? | 8 pages, AMSTeX | Phys.Rev. D68 (2003) 067502 | 10.1103/PhysRevD.68.067502 | null | gr-qc | null | Recent studies have shown that (a) quantum effects may be sufficient to
support a wormhole throat and (b) the total amount of "exotic matter" can be
made arbitrarily small. Unfortunately, using only small amounts of exotic
matter may result in a wormhole that flares out too slowly to be traversable in
a reasonable le... | [
{
"created": "Mon, 12 Jan 2004 17:08:36 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Kuhfittig",
"Peter K. F.",
""
]
] | Recent studies have shown that (a) quantum effects may be sufficient to support a wormhole throat and (b) the total amount of "exotic matter" can be made arbitrarily small. Unfortunately, using only small amounts of exotic matter may result in a wormhole that flares out too slowly to be traversable in a reasonable leng... |
0908.1664 | Leor Barack | Leor Barack | Gravitational self force in extreme mass-ratio inspirals | Invited topical review for CQG; 61 pages, 4 eps figures; uses
iopart.cls, iopart10.clo; v2: minor corrections, references added | Class.Quant.Grav.26:213001,2009 | 10.1088/0264-9381/26/21/213001 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This review is concerned with the gravitational self-force acting on a mass
particle in orbit around a large black hole. Renewed interest in this old
problem is driven by the prospects of detecting gravitational waves from
strongly gravitating binaries with extreme mass ratios. We begin here with a
summary of recent ... | [
{
"created": "Wed, 12 Aug 2009 10:02:33 GMT",
"version": "v1"
},
{
"created": "Thu, 24 Sep 2009 18:48:49 GMT",
"version": "v2"
}
] | 2010-01-08 | [
[
"Barack",
"Leor",
""
]
] | This review is concerned with the gravitational self-force acting on a mass particle in orbit around a large black hole. Renewed interest in this old problem is driven by the prospects of detecting gravitational waves from strongly gravitating binaries with extreme mass ratios. We begin here with a summary of recent ad... |
gr-qc/9612025 | Asher Yahalom | Joseph Katz and Dorit Lerer | On Global Conservation Laws at Null Infinity | null | Class.Quant.Grav. 14 (1997) 2249-2266 | 10.1088/0264-9381/14/8/023 | null | gr-qc | null | The ``standard'' expressions for total energy, linear momentum and also
angular momentum of asymptotically flat Bondi metrics at null infinity are also
obtained from differential conservation laws on asymptotically flat
backgrounds, derived from a quadratic Lagrangian density by methods currently
used in classical fi... | [
{
"created": "Wed, 11 Dec 1996 13:44:02 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Katz",
"Joseph",
""
],
[
"Lerer",
"Dorit",
""
]
] | The ``standard'' expressions for total energy, linear momentum and also angular momentum of asymptotically flat Bondi metrics at null infinity are also obtained from differential conservation laws on asymptotically flat backgrounds, derived from a quadratic Lagrangian density by methods currently used in classical fiel... |
1802.00399 | Luca Buoninfante | Luca Buoninfante, Alexey S. Koshelev, Gaetano Lambiase, Anupam
Mazumdar | Classical properties of non-local, ghost- and singularity-free gravity | 8 pages | null | 10.1088/1475-7516/2018/09/034 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we will show all the linearized curvature tensors in the
infinite derivative ghost and singularity free theory of gravity in the static
limit. We have found that in the region of non-locality, in the ultraviolet
regime (at short distance from the source), the Ricci tensor and the Ricci
scalar are not va... | [
{
"created": "Thu, 1 Feb 2018 17:11:30 GMT",
"version": "v1"
}
] | 2018-10-03 | [
[
"Buoninfante",
"Luca",
""
],
[
"Koshelev",
"Alexey S.",
""
],
[
"Lambiase",
"Gaetano",
""
],
[
"Mazumdar",
"Anupam",
""
]
] | In this paper we will show all the linearized curvature tensors in the infinite derivative ghost and singularity free theory of gravity in the static limit. We have found that in the region of non-locality, in the ultraviolet regime (at short distance from the source), the Ricci tensor and the Ricci scalar are not vani... |
gr-qc/9808027 | Victor Berezin | V. A. Berezin, A. M. Boyarsky, A. Yu. Neronov | Black hole mass spectrum vs spectrum of Hawking radiation | 11 pages, 2 figures, submitted to Phys.Rev.Lett | Phys.Lett. B455 (1999) 109-114 | 10.1016/S0370-2693(99)00452-9 | preprint INR - 0805/98 | gr-qc | null | We consider a massive selfgravitating shell as a model for collapsing body
and a null selfgravitating shell as a model for quanta of Hawking radiation. It
is show that the mass-energy spectra for the body and the radiation do not
match. The way out of this difficulty is to consider not only out-going
radiation but al... | [
{
"created": "Mon, 10 Aug 1998 15:14:37 GMT",
"version": "v1"
}
] | 2009-10-31 | [
[
"Berezin",
"V. A.",
""
],
[
"Boyarsky",
"A. M.",
""
],
[
"Neronov",
"A. Yu.",
""
]
] | We consider a massive selfgravitating shell as a model for collapsing body and a null selfgravitating shell as a model for quanta of Hawking radiation. It is show that the mass-energy spectra for the body and the radiation do not match. The way out of this difficulty is to consider not only out-going radiation but also... |
1804.03468 | Jorge Ovalle | J Ovalle, R Casadio, R da Rocha, A Sotomayor, Z Stuchlik | Black holes by gravitational decoupling | New section with a regular hairy black hole solution; references
added | Eur. Phys. J. C (2018) 78: 960 | 10.1140/epjc/s10052-018-6450-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate how a spherically symmetric fluid modifies the Schwarzschild
vacuum solution when there is no exchange of energy-momentum between the fluid
and the central source of the Schwarzschild metric. This system is described by
means of the gravitational decoupling realised via the minimal geometric
deformatio... | [
{
"created": "Tue, 10 Apr 2018 11:59:47 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jul 2018 15:23:16 GMT",
"version": "v2"
}
] | 2018-11-26 | [
[
"Ovalle",
"J",
""
],
[
"Casadio",
"R",
""
],
[
"da Rocha",
"R",
""
],
[
"Sotomayor",
"A",
""
],
[
"Stuchlik",
"Z",
""
]
] | We investigate how a spherically symmetric fluid modifies the Schwarzschild vacuum solution when there is no exchange of energy-momentum between the fluid and the central source of the Schwarzschild metric. This system is described by means of the gravitational decoupling realised via the minimal geometric deformation ... |
1809.08682 | H\'ector Ra\'ul Olivares S\'anchez | Hector Olivares, Ziri Younsi, Christian M. Fromm, Mariafelicia De
Laurentis, Oliver Porth, Yosuke Mizuno, Heino Falcke, Michael Kramer and
Luciano Rezzolla | How to tell an accreting boson star from a black hole | 16 pages, 12 figures. Published in MNRAS. Adding more information in
the form of appendices, and a new simulation of a different boson star model.
The conclusions do not change | MNRAS 497 (2020) 521-535 | 10.1093/mnras/staa1878 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The capability of the Event Horizon Telescope (EHT) to image the nearest
supermassive black hole candidates at horizon-scale resolutions offers a novel
means to study gravity in its strongest regimes and to test different models
for these objects. Here, we study the observational appearance at 230 GHz of a
surfaceles... | [
{
"created": "Sun, 23 Sep 2018 21:37:20 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Apr 2019 10:00:48 GMT",
"version": "v2"
},
{
"created": "Thu, 6 Aug 2020 23:57:07 GMT",
"version": "v3"
}
] | 2020-08-10 | [
[
"Olivares",
"Hector",
""
],
[
"Younsi",
"Ziri",
""
],
[
"Fromm",
"Christian M.",
""
],
[
"De Laurentis",
"Mariafelicia",
""
],
[
"Porth",
"Oliver",
""
],
[
"Mizuno",
"Yosuke",
""
],
[
"Falcke",
"Heino",
""
... | The capability of the Event Horizon Telescope (EHT) to image the nearest supermassive black hole candidates at horizon-scale resolutions offers a novel means to study gravity in its strongest regimes and to test different models for these objects. Here, we study the observational appearance at 230 GHz of a surfaceless ... |
2003.01038 | Macarena Lagos | Macarena Lagos, Hanjue Zhu | Gravitational couplings in Chameleon models | null | null | 10.1088/1475-7516/2020/06/061 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider cosmological models where dark energy is described by a dynamical
field equipped with the Chameleon screening mechanism, which serves to hide its
effects in local dense regions and to conform to Solar System observations. In
these models, there is no universal gravitational coupling and here we study
the ... | [
{
"created": "Mon, 2 Mar 2020 17:15:48 GMT",
"version": "v1"
}
] | 2020-07-22 | [
[
"Lagos",
"Macarena",
""
],
[
"Zhu",
"Hanjue",
""
]
] | We consider cosmological models where dark energy is described by a dynamical field equipped with the Chameleon screening mechanism, which serves to hide its effects in local dense regions and to conform to Solar System observations. In these models, there is no universal gravitational coupling and here we study the ef... |
gr-qc/9308028 | Othmar Brodbeck | O. Brodbeck and N. Straumann | Selfgravitating Yang-Mills solitons and their Chern-Simons numbers | 31 pages, Latex, report ZU-TH 23/93, figure can be obtained from the
authors | J.Math.Phys.35:899-919,1994 | 10.1063/1.530620 | null | gr-qc | null | We present a classification of the possible regular, spherically symmetric
solutions of the Einstein-Yang-Mills system which is based on a bundle
theoretical analysis for arbitrary gauge groups. It is shown that such solitons
must be of magnetic type, at least if the magnetic Yang-Mills charge vanishes.
Explicit expr... | [
{
"created": "Thu, 26 Aug 1993 13:12:32 GMT",
"version": "v1"
}
] | 2010-11-01 | [
[
"Brodbeck",
"O.",
""
],
[
"Straumann",
"N.",
""
]
] | We present a classification of the possible regular, spherically symmetric solutions of the Einstein-Yang-Mills system which is based on a bundle theoretical analysis for arbitrary gauge groups. It is shown that such solitons must be of magnetic type, at least if the magnetic Yang-Mills charge vanishes. Explicit expres... |
gr-qc/0107020 | Patricio S. Letelier | Patricio S. Letelier | Spacetime Defects: von K\'arm\'an vortex street like configurations | 9 pages, 2figures, CQG in press | Class.Quant.Grav. 18 (2001) 3639-3644 | 10.1088/0264-9381/18/17/316 | null | gr-qc | null | A special arrangement of spinning strings with dislocations similar to a von
K\'arm\'an vortex street is studied. We numerically solve the geodesic
equations for the special case of a test particle moving along twoinfinite rows
of pure dislocations and also discuss the case of pure spinning defects.
| [
{
"created": "Thu, 5 Jul 2001 14:54:28 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Letelier",
"Patricio S.",
""
]
] | A special arrangement of spinning strings with dislocations similar to a von K\'arm\'an vortex street is studied. We numerically solve the geodesic equations for the special case of a test particle moving along twoinfinite rows of pure dislocations and also discuss the case of pure spinning defects. |
gr-qc/9403040 | null | D.C. Salisbury and L. C. Shepley | A Connection Approach to Numerical Relativity | 17 pages, LaTex | Class.Quant.Grav.11:2789-2806,1994 | 10.1088/0264-9381/11/11/019 | null | gr-qc | null | We discuss a general formalism for numerically evolving initial data in
general relativity in which the (complex) Ashtekar connection and the
Newman-Penrose scalars are taken as the dynamical variables. In the generic
case three gauge constraints and twelve reality conditions must be solved. The
analysis is applied t... | [
{
"created": "Sat, 19 Mar 1994 00:35:28 GMT",
"version": "v1"
}
] | 2010-04-06 | [
[
"Salisbury",
"D. C.",
""
],
[
"Shepley",
"L. C.",
""
]
] | We discuss a general formalism for numerically evolving initial data in general relativity in which the (complex) Ashtekar connection and the Newman-Penrose scalars are taken as the dynamical variables. In the generic case three gauge constraints and twelve reality conditions must be solved. The analysis is applied to ... |
1910.08203 | Michael Florian Wondrak | Michael F. Wondrak, Marcus Bleicher | Constraints on the String T-Duality Propagator from the Hydrogen Atom | 12 pages, 3 figures. Invited contribution to the special issue
"Modified Theories of Gravity" by Symmetry | null | null | null | gr-qc hep-ph hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the implications of a string-theory modified propagator in the
high-precision regime of quantum mechanics. In particular, we examine the
situation in which string theory is compactified at the T-duality self-dual
radius. The corresponding propagator is closely related to the one derived from
the path i... | [
{
"created": "Fri, 18 Oct 2019 00:02:58 GMT",
"version": "v1"
}
] | 2019-10-21 | [
[
"Wondrak",
"Michael F.",
""
],
[
"Bleicher",
"Marcus",
""
]
] | We investigate the implications of a string-theory modified propagator in the high-precision regime of quantum mechanics. In particular, we examine the situation in which string theory is compactified at the T-duality self-dual radius. The corresponding propagator is closely related to the one derived from the path int... |
1112.5278 | Huiquan Li | Huiquan Li | Tachyon cosmology with non-vanishing minimum potential: a unified model | 18 pp | null | 10.1088/1475-7516/2012/07/018 | USTC-ICTS-11-16 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the tachyon condensation process in the effective theory with
non-vanishing minimum potential and its implications to cosmology. It is shown
that the tachyon condensation on an unstable three-brane described by this
modified tachyon field theory leads to lower-dimensional branes (defects)
forming withi... | [
{
"created": "Thu, 22 Dec 2011 11:08:42 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jun 2012 13:59:57 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Li",
"Huiquan",
""
]
] | We investigate the tachyon condensation process in the effective theory with non-vanishing minimum potential and its implications to cosmology. It is shown that the tachyon condensation on an unstable three-brane described by this modified tachyon field theory leads to lower-dimensional branes (defects) forming within ... |
2105.06360 | H\'ector Estell\'es | H\'ector Estell\'es, Sascha Husa, Marta Colleoni, Maite Mateu-Lucena,
Maria de Lluc Planas, Cecilio Garc\'ia-Quir\'os, David Keitel, Antoni
Ramos-Buades, Ajit Kumar Mehta, Alessandra Buonanno, Serguei Ossokine | A detailed analysis of GW190521 with phenomenological waveform models | 20 pages, 13 figures, 7 tables. Data release at
https://zenodo.org/record/4751655 | null | 10.3847/1538-4357/ac33a0 | LIGO-P2100149 | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present an extensive analysis of the GW190521 gravitational
wave event with the current (fourth) generation of phenomenological waveform
models for binary black hole coalescences. GW190521 stands out from other
events since only a few wave cycles are observable. This leads to a number of
challenges, ... | [
{
"created": "Thu, 13 May 2021 15:39:59 GMT",
"version": "v1"
},
{
"created": "Mon, 17 May 2021 15:34:24 GMT",
"version": "v2"
},
{
"created": "Thu, 3 Jun 2021 15:02:14 GMT",
"version": "v3"
}
] | 2022-01-19 | [
[
"Estellés",
"Héctor",
""
],
[
"Husa",
"Sascha",
""
],
[
"Colleoni",
"Marta",
""
],
[
"Mateu-Lucena",
"Maite",
""
],
[
"Planas",
"Maria de Lluc",
""
],
[
"García-Quirós",
"Cecilio",
""
],
[
"Keitel",
"David",
... | In this paper we present an extensive analysis of the GW190521 gravitational wave event with the current (fourth) generation of phenomenological waveform models for binary black hole coalescences. GW190521 stands out from other events since only a few wave cycles are observable. This leads to a number of challenges, on... |
1704.03793 | Nirmalya Kajuri | Nirmalya Kajuri | Unruh Effect in non local field theories | 3 pages, 0 figures. Accepted for publication as a Rapid Communication
in PRD | Phys. Rev. D 95, 101701 (2017) | 10.1103/PhysRevD.95.101701 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study Unruh effect for a wide class of non local theories. Using the
approach of Bogoliubov coefficents we show that Unruh effect remains entirely
unmodified in these theories. However, for those non local theories which
incorporate a minimal length, the approach using Unruh-DeWitt detectors
predicts a modificatio... | [
{
"created": "Wed, 12 Apr 2017 15:14:01 GMT",
"version": "v1"
},
{
"created": "Mon, 1 May 2017 09:12:50 GMT",
"version": "v2"
}
] | 2017-05-24 | [
[
"Kajuri",
"Nirmalya",
""
]
] | We study Unruh effect for a wide class of non local theories. Using the approach of Bogoliubov coefficents we show that Unruh effect remains entirely unmodified in these theories. However, for those non local theories which incorporate a minimal length, the approach using Unruh-DeWitt detectors predicts a modification ... |
2011.03728 | Dimitri Estevez | Dimitri Estevez, Beno\^it Mours, Thierry Pradier | Newtonian calibrator tests during the Virgo O3 data taking | null | Class. Quant. Grav. (2021) | 10.1088/1361-6382/abe2da | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The gravitational-wave detectors outputs from the LIGO and Virgo
collaborations have been a source of scientific results of prime importance in
various domains such as astrophysics, cosmology or fundamental physics. With
the upgrades of the detectors and their improved sensitivities, new challenges
are set for these ... | [
{
"created": "Sat, 7 Nov 2020 09:02:25 GMT",
"version": "v1"
},
{
"created": "Fri, 29 Jan 2021 16:45:56 GMT",
"version": "v2"
}
] | 2021-02-05 | [
[
"Estevez",
"Dimitri",
""
],
[
"Mours",
"Benoît",
""
],
[
"Pradier",
"Thierry",
""
]
] | The gravitational-wave detectors outputs from the LIGO and Virgo collaborations have been a source of scientific results of prime importance in various domains such as astrophysics, cosmology or fundamental physics. With the upgrades of the detectors and their improved sensitivities, new challenges are set for these in... |
gr-qc/0504148 | Rod Aros | Rodrigo Aros | Energy and Hamiltonian in first order gravity | null | null | null | gacg/2005-03 | gr-qc | null | In this work the definition of a quasilocal energy for four dimensional first
order gravity is developed. Using this an action principle which is adequate
for the canonical ensemble is obtained. The microcanonical action principle is
obtained as well.
| [
{
"created": "Fri, 29 Apr 2005 18:35:50 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Aros",
"Rodrigo",
""
]
] | In this work the definition of a quasilocal energy for four dimensional first order gravity is developed. Using this an action principle which is adequate for the canonical ensemble is obtained. The microcanonical action principle is obtained as well. |
gr-qc/0509003 | R. R. Cuzinatto | R. Aldrovandi, R. R. Cuzinatto and L. G. Medeiros | Primeval symmetries | 16 pages, 2 tables; published version | Gen.Rel.Grav.39:1813-1832,2007 | 10.1007/s10714-007-0490-7 | null | gr-qc | null | A detailed examination of the Killing equations in Robertson-Walker
coordinates shows how the addition of matter and/or radiation to a de Sitter
Universe breaks the symmetry generated by four of its Killing fields. The
product U = (a^2)(dH/dt) of the squared scale parameter by the time-derivative
of the Hubble functi... | [
{
"created": "Thu, 1 Sep 2005 01:07:24 GMT",
"version": "v1"
},
{
"created": "Thu, 22 Feb 2007 18:03:04 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Aug 2007 17:56:09 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Aldrovandi",
"R.",
""
],
[
"Cuzinatto",
"R. R.",
""
],
[
"Medeiros",
"L. G.",
""
]
] | A detailed examination of the Killing equations in Robertson-Walker coordinates shows how the addition of matter and/or radiation to a de Sitter Universe breaks the symmetry generated by four of its Killing fields. The product U = (a^2)(dH/dt) of the squared scale parameter by the time-derivative of the Hubble function... |
gr-qc/0507078 | John Stachel | John Stachel | Structure, Individuality and Quantum Gravity | 39 pages, to appear in "Structural Foundations of Quantum Gravity,"
edited by D.P. Rickles, S.R.D. French and J. Saatsi Oxford University Press | null | null | null | gr-qc | null | After reviewing various interpretations of structural realism, I adopt here a
definition that allows both relations between things that are already
individuated (which I call ``relations between things'') and relations that
individuate previously un-individuated entities ("things between relations").
Since both space... | [
{
"created": "Mon, 18 Jul 2005 14:30:05 GMT",
"version": "v1"
},
{
"created": "Tue, 19 Jul 2005 12:00:03 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Stachel",
"John",
""
]
] | After reviewing various interpretations of structural realism, I adopt here a definition that allows both relations between things that are already individuated (which I call ``relations between things'') and relations that individuate previously un-individuated entities ("things between relations"). Since both space-t... |
1812.02635 | Jiri Podolsky | Jiri Podolsky, Robert Svarc | Gyratons in the Robinson-Trautman and Kundt classes | 12 pages, no figures, correction to our previous article Phys. Rev. D
89 (2014) 124029, arXiv:1406.0729. Reference [24] added in version 2,
accepted for publication in Phys. Rev. D | Phys. Rev. D 99, 044004 (2019) | 10.1103/PhysRevD.99.044004 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In our previous paper [Phys. Rev. D 89 (2014) 124029], cited as [1], we
attempted to find Robinson-Trautman-type solutions of Einstein's equations
representing gyratonic sources (matter field in the form of an aligned null
fluid, or particles propagating with the speed of light, with an additional
internal spin). Unf... | [
{
"created": "Thu, 6 Dec 2018 16:15:01 GMT",
"version": "v1"
},
{
"created": "Fri, 25 Jan 2019 16:14:48 GMT",
"version": "v2"
}
] | 2019-02-13 | [
[
"Podolsky",
"Jiri",
""
],
[
"Svarc",
"Robert",
""
]
] | In our previous paper [Phys. Rev. D 89 (2014) 124029], cited as [1], we attempted to find Robinson-Trautman-type solutions of Einstein's equations representing gyratonic sources (matter field in the form of an aligned null fluid, or particles propagating with the speed of light, with an additional internal spin). Unfor... |
1305.5190 | \"Ozg\"ur Akarsu | Ozgur Akarsu, Tekin Dereli, Suresh Kumar, Lixin Xu | Probing kinematics and fate of the Universe with linearly time-varying
deceleration parameter | 15 pages, 3 figures, 9 tables; matches the version published in The
European Physical Journal Plus | The European Physical Journal Plus 129 (2014) 22 | 10.1140/epjp/i2014-14022-6 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The parametrizations $q=q_0+q_1 z$ and $q=q_0+q_1 (1-a/a_0)$
(Chevallier-Polarski-Linder parametrization) of deceleration parameter, which
are linear in cosmic redshift $z$ and scale factor $a$, have been frequently
utilized in the literature to study kinematics of Universe. In this paper, we
follow a strategy that l... | [
{
"created": "Wed, 22 May 2013 16:46:11 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Sep 2013 13:46:33 GMT",
"version": "v2"
},
{
"created": "Tue, 4 Feb 2014 18:03:41 GMT",
"version": "v3"
}
] | 2014-02-05 | [
[
"Akarsu",
"Ozgur",
""
],
[
"Dereli",
"Tekin",
""
],
[
"Kumar",
"Suresh",
""
],
[
"Xu",
"Lixin",
""
]
] | The parametrizations $q=q_0+q_1 z$ and $q=q_0+q_1 (1-a/a_0)$ (Chevallier-Polarski-Linder parametrization) of deceleration parameter, which are linear in cosmic redshift $z$ and scale factor $a$, have been frequently utilized in the literature to study kinematics of Universe. In this paper, we follow a strategy that lea... |
gr-qc/0105090 | Jozef Sima | Jozef Sima and Miroslav Sukenik | Cosmological Constant, Quintessence and Expansive Nondecelerative
Universe | 6 pages, LaTeX | null | null | SS-01-06 | gr-qc | null | Recent observations of the Universe have led to a conclusion suppressing an
up-to-now supposed deceleration of the Universe caused by attractive
gravitational forces. Contrary, there is a renaissance of the cosmological
member lambda and introduction of enigmatic repulsive dark energy in attempts
to rationalize a wou... | [
{
"created": "Fri, 25 May 2001 06:49:14 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sima",
"Jozef",
""
],
[
"Sukenik",
"Miroslav",
""
]
] | Recent observations of the Universe have led to a conclusion suppressing an up-to-now supposed deceleration of the Universe caused by attractive gravitational forces. Contrary, there is a renaissance of the cosmological member lambda and introduction of enigmatic repulsive dark energy in attempts to rationalize a would... |
1104.3253 | H.-J. Schmidt | H.-J. Schmidt | Perihelion advance for orbits with large eccentricities in the
Schwarzschild black hole | 22 pages, new results added at the end of scts. 4 and 5, accepted for
Phys. Rev. D | Phys.Rev.D83:124010,2011 | 10.1103/PhysRevD.83.124010 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We deduce a new formula for the perihelion advance of a test particle in the
Schwarzschild black hole by applying a newly developed non-linear
transformation within the Schwarzschild space-time. By this transformation we
are able to apply the well-known formula valid in the weak-field approximation
near infinity also... | [
{
"created": "Sat, 16 Apr 2011 18:33:03 GMT",
"version": "v1"
},
{
"created": "Wed, 18 May 2011 08:04:54 GMT",
"version": "v2"
}
] | 2011-06-13 | [
[
"Schmidt",
"H. -J.",
""
]
] | We deduce a new formula for the perihelion advance of a test particle in the Schwarzschild black hole by applying a newly developed non-linear transformation within the Schwarzschild space-time. By this transformation we are able to apply the well-known formula valid in the weak-field approximation near infinity also t... |
1604.07753 | Vyacheslav Dokuchaev | Victor Berezin, Vyacheslav Dokuchaev and Yury Eroshenko | Particle creation phenomenology, Dirac sea and the induced Weyl and
Einstein-dilaton gravity | 12 pages, advanced version | JCAP01(2017)018 | 10.1088/1475-7516/2017/01/018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We constructed the conformally invariant model for scalar particle creation
induced by strong gravitational fields. Starting from the "usual"
hydrodynamical description of the particle motion written in the Eulerian
coordinates we substituted the particle number conservation law (which enters
the formalism) by "the p... | [
{
"created": "Tue, 26 Apr 2016 16:57:24 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Aug 2016 15:11:56 GMT",
"version": "v2"
}
] | 2017-01-17 | [
[
"Berezin",
"Victor",
""
],
[
"Dokuchaev",
"Vyacheslav",
""
],
[
"Eroshenko",
"Yury",
""
]
] | We constructed the conformally invariant model for scalar particle creation induced by strong gravitational fields. Starting from the "usual" hydrodynamical description of the particle motion written in the Eulerian coordinates we substituted the particle number conservation law (which enters the formalism) by "the par... |
1701.07900 | Ernesto Nungesser | Ho Lee and Ernesto Nungesser | Self-similarity breaking of cosmological solutions with collisionless
matter | 15 pages | Ann. Henri Poincare 19 (2018), 2137-2155 | 10.1007/s00023-018-0678-2 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we consider the Einstein-Vlasov system with Bianchi VII$_0$
symmetry. Under the assumption of small data we show that self-similarity
breaking occurs for reflection symmetric solutions. This generalizes the
previous work concerning the non-tilted fluid case \cite{WHU} to the Vlasov
case, and we obtain d... | [
{
"created": "Thu, 26 Jan 2017 23:07:14 GMT",
"version": "v1"
}
] | 2024-06-21 | [
[
"Lee",
"Ho",
""
],
[
"Nungesser",
"Ernesto",
""
]
] | In this paper we consider the Einstein-Vlasov system with Bianchi VII$_0$ symmetry. Under the assumption of small data we show that self-similarity breaking occurs for reflection symmetric solutions. This generalizes the previous work concerning the non-tilted fluid case \cite{WHU} to the Vlasov case, and we obtain det... |
gr-qc/0301065 | Bahram Mashhoon | Bahram Mashhoon | Acceleration-Induced Nonlocality | LaTeX file, no figures, 9 pages, to appear in: "Advances in General
Relativity and Cosmology", edited by G. Ferrarese, Pitagora (Bologna), 2003 | null | null | null | gr-qc | null | The standard relativistic theory of accelerated reference frames in Minkowski
spacetime is described. The measurements of accelerated observers are
considered and the limitations of the standard theory, based on the hypothesis
of locality, are pointed out. The physical principles of the nonlocal theory of
accelerated... | [
{
"created": "Fri, 17 Jan 2003 22:42:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Mashhoon",
"Bahram",
""
]
] | The standard relativistic theory of accelerated reference frames in Minkowski spacetime is described. The measurements of accelerated observers are considered and the limitations of the standard theory, based on the hypothesis of locality, are pointed out. The physical principles of the nonlocal theory of accelerated o... |
1912.13348 | Elsa Teixeira | Elsa M. Teixeira, Ana Nunes, and Nelson J. Nunes | Disformally Coupled Quintessence | 20 pages, 6 figures. V2: Matches published version | Phys. Rev. D 101, 083506 (2020) | 10.1103/PhysRevD.101.083506 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this work we consider a cosmological model in which dark energy is
portrayed by a canonical scalar field which is allowed to couple to the other
species by means of a disformal transformation of the metric. We revisit the
current literature by assuming that the disformal function in the metric
transformation can d... | [
{
"created": "Tue, 31 Dec 2019 15:15:24 GMT",
"version": "v1"
},
{
"created": "Fri, 3 Apr 2020 17:10:36 GMT",
"version": "v2"
}
] | 2020-04-06 | [
[
"Teixeira",
"Elsa M.",
""
],
[
"Nunes",
"Ana",
""
],
[
"Nunes",
"Nelson J.",
""
]
] | In this work we consider a cosmological model in which dark energy is portrayed by a canonical scalar field which is allowed to couple to the other species by means of a disformal transformation of the metric. We revisit the current literature by assuming that the disformal function in the metric transformation can dep... |
gr-qc/0412096 | Pestov | Ivanhoe Pestov | Dark Matter and Potential fields | to appear as a chapter in "Progress in Dark Matter Research" (Nova,
New York) | null | null | null | gr-qc | null | A general concept of potential field is introduced. The potential field that
one puts in correspondence with dark matter, has fundamental geometrical
interpretation (parallel transport) and has intrinsically inherent in local
symmetry. The equations of dark matter field are derived that are invariant
with respect to ... | [
{
"created": "Mon, 20 Dec 2004 11:20:57 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Pestov",
"Ivanhoe",
""
]
] | A general concept of potential field is introduced. The potential field that one puts in correspondence with dark matter, has fundamental geometrical interpretation (parallel transport) and has intrinsically inherent in local symmetry. The equations of dark matter field are derived that are invariant with respect to th... |
1608.02244 | Lior M. Burko | Lior M. Burko, Gaurav Khanna | Gravitational waves from a plunge into a nearly extremal Kerr black hole | 7 pages, 9 figures | Phys. Rev. D 94, 084049 (2016) | 10.1103/PhysRevD.94.084049 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study numerically in the time domain the linearized gravitational waves
emitted from a plunge into a nearly extremal Kerr black hole by solving the
inhomogeneous Teukolsky equation. We consider spinning black holes for which
the specific spin angular momentum $a/M=1-\epsilon$, and we consider values of
$\epsilon\g... | [
{
"created": "Sun, 7 Aug 2016 17:15:29 GMT",
"version": "v1"
}
] | 2016-11-02 | [
[
"Burko",
"Lior M.",
""
],
[
"Khanna",
"Gaurav",
""
]
] | We study numerically in the time domain the linearized gravitational waves emitted from a plunge into a nearly extremal Kerr black hole by solving the inhomogeneous Teukolsky equation. We consider spinning black holes for which the specific spin angular momentum $a/M=1-\epsilon$, and we consider values of $\epsilon\geq... |
1807.02160 | Yury F. Pirogov | Yury F. Pirogov | Affine-Goldstone/quartet-metric gravity: emergent vs. existent | 17 pages. Slightly modified and abriged version. Content unchanged | Physics of Atomic Nuclei, 82(5), 503-512 (2019) | 10.1134/S1063778819050120 | null | gr-qc hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As a group-theoretic foundation of gravity, it is considered an
affine-Goldstone nonlinear model based upon the nonlinear realization of the
global affine symmetry spontaneously broken at the Planck scale to the Poincare
symmetry. It is shown that below this scale the model justifies and elaborates
an earlier introdu... | [
{
"created": "Thu, 5 Jul 2018 19:32:54 GMT",
"version": "v1"
},
{
"created": "Sun, 29 Dec 2019 15:02:00 GMT",
"version": "v2"
}
] | 2020-01-01 | [
[
"Pirogov",
"Yury F.",
""
]
] | As a group-theoretic foundation of gravity, it is considered an affine-Goldstone nonlinear model based upon the nonlinear realization of the global affine symmetry spontaneously broken at the Planck scale to the Poincare symmetry. It is shown that below this scale the model justifies and elaborates an earlier introduce... |
1607.06227 | Norbert Bodendorfer | Norbert Bodendorfer | State refinements and coarse graining in a full theory embedding of loop
quantum cosmology | 12 pages; v2: journal version, many clarifications and minor
corrections | Class. Quantum Grav. 34 (2017) 135016 | 10.1088/1361-6382/aa7450 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bridging between descriptions involving few large and many small quantum
numbers is the main open problem in loop quantum gravity. In other words, one
would like to be able to represent the same physical system in terms of a few
"coarse"' quantum numbers, while the effective dynamics at the coarse level
should agree ... | [
{
"created": "Thu, 21 Jul 2016 08:11:22 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Jun 2017 14:10:12 GMT",
"version": "v2"
}
] | 2017-06-26 | [
[
"Bodendorfer",
"Norbert",
""
]
] | Bridging between descriptions involving few large and many small quantum numbers is the main open problem in loop quantum gravity. In other words, one would like to be able to represent the same physical system in terms of a few "coarse"' quantum numbers, while the effective dynamics at the coarse level should agree wi... |
2110.01883 | Chetan Verma | Chetan Verma, Amit Reza, Dilip Krishnaswamy, Sarah Caudill, Gurudatt
Gaur | Employing Deep Learning for Detection of Gravitational Waves from
Compact Binary Coalescences | null | null | 10.1063/5.0108682 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The matched filtering paradigm is the mainstay of gravitational wave (GW)
searches from astrophysical coalescing compact binaries. The compact binary
coalescence (CBC) search pipelines perform the matched filter between the GW
detector's data and a large set of analytical waveforms. However, the
computational cost of... | [
{
"created": "Tue, 5 Oct 2021 09:05:21 GMT",
"version": "v1"
}
] | 2024-06-19 | [
[
"Verma",
"Chetan",
""
],
[
"Reza",
"Amit",
""
],
[
"Krishnaswamy",
"Dilip",
""
],
[
"Caudill",
"Sarah",
""
],
[
"Gaur",
"Gurudatt",
""
]
] | The matched filtering paradigm is the mainstay of gravitational wave (GW) searches from astrophysical coalescing compact binaries. The compact binary coalescence (CBC) search pipelines perform the matched filter between the GW detector's data and a large set of analytical waveforms. However, the computational cost of p... |
gr-qc/9810008 | Alvaro L. | H. N. N\'u\~nez-Y\'epez | Singularities and isotropy in a Brans-Dicke Bianchi-type VII universe | 12 pages, 3 figures submitted to Gen. Rel. Grav | null | null | null | gr-qc | null | We study the dynamical effects in the scale factors due to the scalar
$\phi$-field at the early stages of a supposedly anisotropic Universe expansion
in connection with the problem of the initial singularity in the scalar-tensor
cosmology of Jordan-Brans-Dicke. This is done by considering the behaviour of
the general... | [
{
"created": "Fri, 2 Oct 1998 19:15:06 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Núñez-Yépez",
"H. N.",
""
]
] | We study the dynamical effects in the scale factors due to the scalar $\phi$-field at the early stages of a supposedly anisotropic Universe expansion in connection with the problem of the initial singularity in the scalar-tensor cosmology of Jordan-Brans-Dicke. This is done by considering the behaviour of the general a... |
1411.0686 | Paolo Pani | Richard Brito, Vitor Cardoso, Paolo Pani | Black holes as particle detectors: evolution of superradiant
instabilities | 19 pages, 5 figures. Invited contribution to the Focus Issue on
"Black holes and fundamental fields" to appear in Classical and Quantum
Gravity | null | 10.1088/0264-9381/32/13/134001 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Superradiant instabilities of spinning black holes can be used to impose
strong constraints on ultralight bosons, thus turning black holes into
effective particle detectors. However, very little is known about the
development of the instability and whether its nonlinear time evolution accords
to the linear intuition.... | [
{
"created": "Mon, 3 Nov 2014 21:00:29 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Brito",
"Richard",
""
],
[
"Cardoso",
"Vitor",
""
],
[
"Pani",
"Paolo",
""
]
] | Superradiant instabilities of spinning black holes can be used to impose strong constraints on ultralight bosons, thus turning black holes into effective particle detectors. However, very little is known about the development of the instability and whether its nonlinear time evolution accords to the linear intuition. F... |
gr-qc/9406017 | Haret Rosu | H.C. Rosu | S^1 \times S^2 as a bag membrane and its Einstein-Weyl geometry | 9pp in latex, minor corrections | Nuovo Cim.A107:1543-1548,1994 | 10.1007/BF02780688 | null | gr-qc | null | In the hybrid skyrmion in which an Anti-de Sitter bag is imbedded into the
skyrmion configuration a S^{1}\times S^{2} membrane is lying on the
compactified spatial infinity of the bag [H. Rosu, Nuovo Cimento B 108, 313
(1993)]. The connection between the quark degrees of freedom and the mesonic
ones is made through t... | [
{
"created": "Thu, 9 Jun 1994 17:38:00 GMT",
"version": "v1"
},
{
"created": "Sun, 26 Oct 1997 02:13:03 GMT",
"version": "v2"
}
] | 2011-07-19 | [
[
"Rosu",
"H. C.",
""
]
] | In the hybrid skyrmion in which an Anti-de Sitter bag is imbedded into the skyrmion configuration a S^{1}\times S^{2} membrane is lying on the compactified spatial infinity of the bag [H. Rosu, Nuovo Cimento B 108, 313 (1993)]. The connection between the quark degrees of freedom and the mesonic ones is made through the... |
gr-qc/0101076 | Giampiero Esposito Dr. | Giampiero Esposito | On the Green functions of gravitational radiation theory | 15 pages, plain Tex. A misprint on the right-hand side of Eqs. (3.5)
and (3.6) has been amended | Class.Quant.Grav. 18 (2001) 1997-2006 | 10.1088/0264-9381/18/11/301 | DSF preprint 2001/2 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Previous work in the literature has studied gravitational radiation in
black-hole collisions at the speed of light. In particular, it had been proved
that the perturbative field equations may all be reduced to equations in only
two independent variables, by virtue of a conformal symmetry at each order in
perturbation... | [
{
"created": "Thu, 18 Jan 2001 16:05:36 GMT",
"version": "v1"
},
{
"created": "Wed, 17 Oct 2018 09:33:11 GMT",
"version": "v2"
}
] | 2018-10-18 | [
[
"Esposito",
"Giampiero",
""
]
] | Previous work in the literature has studied gravitational radiation in black-hole collisions at the speed of light. In particular, it had been proved that the perturbative field equations may all be reduced to equations in only two independent variables, by virtue of a conformal symmetry at each order in perturbation t... |
2112.12381 | Andronikos Paliathanasis | Franco Fiorini and Andronikos Paliathanasis | Role of the remnant symmetries in gravitational theories based on
absolute parallelism: a 2D standpoint | 11 pages, 1 figure, accepted for publication in Classical and Quantum
Gravity | Class. Quantum Grav. 39 095003 (2022) | 10.1088/1361-6382/ac5eb9 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | By using simplified 2D gravitational, non-local Lorentz invariant actions
constructed upon the torsion tensor, we discuss the physical meaning of the
remnant symmetries associated with the near-horizon (Milne) geometry
experienced by a radial observer in Schwarzschild spacetime. We then fully
characterize the remnant... | [
{
"created": "Thu, 23 Dec 2021 06:36:12 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Mar 2022 07:59:59 GMT",
"version": "v2"
}
] | 2022-05-24 | [
[
"Fiorini",
"Franco",
""
],
[
"Paliathanasis",
"Andronikos",
""
]
] | By using simplified 2D gravitational, non-local Lorentz invariant actions constructed upon the torsion tensor, we discuss the physical meaning of the remnant symmetries associated with the near-horizon (Milne) geometry experienced by a radial observer in Schwarzschild spacetime. We then fully characterize the remnant s... |
2009.10667 | Andrea Giusti | Roberto Casadio, Andrea Giusti | Bootstrapped Newtonian cosmology and the cosmological constant problem | 11 pages, no figures, to appear in Symmetry | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Bootstrapped Newtonian gravity was developed with the purpose of estimating
the impact of quantum physics in the nonlinear regime of the gravitational
interaction, akin to corpuscular models of black holes and inflation. In this
work, we set the ground for extending the bootstrapped Newtonian picture to
cosmological ... | [
{
"created": "Tue, 22 Sep 2020 16:41:04 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Feb 2021 10:14:53 GMT",
"version": "v2"
}
] | 2021-02-22 | [
[
"Casadio",
"Roberto",
""
],
[
"Giusti",
"Andrea",
""
]
] | Bootstrapped Newtonian gravity was developed with the purpose of estimating the impact of quantum physics in the nonlinear regime of the gravitational interaction, akin to corpuscular models of black holes and inflation. In this work, we set the ground for extending the bootstrapped Newtonian picture to cosmological sp... |
gr-qc/0202014 | Choquet-Bruhat | Yvonne Choquet-Bruhat and James W. York | On H. Friedrich's formulation of Einstein'equations with fluid sources | To appear in TMNA, volume in honor of A. Granas | null | null | null | gr-qc | null | We establish a variant, which has the advantage of introducing only physical
characteristics, of the symmetric quasi linear first order system given by H.\
Friedrich for the evolution equations of gravitating fluid bodies in General
Relativity which can be important to solve realistic problems. We explicit the
condit... | [
{
"created": "Tue, 5 Feb 2002 19:51:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Choquet-Bruhat",
"Yvonne",
""
],
[
"York",
"James W.",
""
]
] | We establish a variant, which has the advantage of introducing only physical characteristics, of the symmetric quasi linear first order system given by H.\ Friedrich for the evolution equations of gravitating fluid bodies in General Relativity which can be important to solve realistic problems. We explicit the conditio... |
2305.15910 | Hoang Nam Cao | Tran N. Hung, Cao H. Nam | Topology in thermodynamics of regular black strings with Kaluza-Klein
reduction | 21 pages, 10 figures | null | 10.1140/epjc/s10052-023-11768-5 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | We study the topological defects in the thermodynamics of regular black
strings (from a four-dimensional perspective) that is symmetric under the
double Wick rotation and constructed in the high-dimensional spacetime with an
extra dimension compactified on a circle. We observe that the thermodynamic
phases of regular... | [
{
"created": "Thu, 25 May 2023 10:16:37 GMT",
"version": "v1"
}
] | 2023-07-26 | [
[
"Hung",
"Tran N.",
""
],
[
"Nam",
"Cao H.",
""
]
] | We study the topological defects in the thermodynamics of regular black strings (from a four-dimensional perspective) that is symmetric under the double Wick rotation and constructed in the high-dimensional spacetime with an extra dimension compactified on a circle. We observe that the thermodynamic phases of regular b... |
0708.0037 | Simone Mercuri | Simone Mercuri | From the Einstein-Cartan to the Ashtekar-Barbero canonical constraints,
passing through the Nieh-Yan functional | Minor changes, two references added, accepted for publication in
Phys. Rev. D | Phys.Rev.D77:024036,2008 | 10.1103/PhysRevD.77.024036 | null | gr-qc | null | The Ashtekar-Barbero constraints for General Relativity with fermions are
derived from the Einstein-Cartan canonical theory rescaling the state
functional of the gravity-spinor coupled system by the exponential of the
Nieh-Yan functional. A one parameter quantization ambiguity naturally appears
and can be associated ... | [
{
"created": "Tue, 31 Jul 2007 22:07:10 GMT",
"version": "v1"
},
{
"created": "Sun, 18 Nov 2007 23:18:36 GMT",
"version": "v2"
},
{
"created": "Thu, 17 Jan 2008 16:56:39 GMT",
"version": "v3"
}
] | 2008-11-26 | [
[
"Mercuri",
"Simone",
""
]
] | The Ashtekar-Barbero constraints for General Relativity with fermions are derived from the Einstein-Cartan canonical theory rescaling the state functional of the gravity-spinor coupled system by the exponential of the Nieh-Yan functional. A one parameter quantization ambiguity naturally appears and can be associated wi... |
2404.19521 | De-Cheng Zou | Chao-Ming Zhang, Zhen-Hao Yang, Meng-Yun Lai, Yun Soo Myung and
De-Cheng Zou | Nonlinear scalarization of Schwarzschild black holes in
Einstein-scalar-Gauss-Bonnet gravity | 14 pages, 6 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we propose a fully nonlinear mechanism for obtaining
scalarized black holes in Einstein-scalar-Gauss-Bonnet (EsGB) gravity which is
beyond the spontaneous scalarization. Introducing three coupling functions
$f(\varphi)$ satisfying $f''(0) = 0$, we find that Schwarzschild black hole is
linearly stable a... | [
{
"created": "Tue, 30 Apr 2024 12:50:10 GMT",
"version": "v1"
}
] | 2024-05-01 | [
[
"Zhang",
"Chao-Ming",
""
],
[
"Yang",
"Zhen-Hao",
""
],
[
"Lai",
"Meng-Yun",
""
],
[
"Myung",
"Yun Soo",
""
],
[
"Zou",
"De-Cheng",
""
]
] | In this paper, we propose a fully nonlinear mechanism for obtaining scalarized black holes in Einstein-scalar-Gauss-Bonnet (EsGB) gravity which is beyond the spontaneous scalarization. Introducing three coupling functions $f(\varphi)$ satisfying $f''(0) = 0$, we find that Schwarzschild black hole is linearly stable aga... |
gr-qc/9512005 | Beverly Berger | Beverly K. Berger | Comment on the chaotic singularity in some magnetic Bianchi VI$_0$
cosmologies | 8 pages, Revtex, no figures | Class.Quant.Grav. 13 (1996) 1273-1276 | 10.1088/0264-9381/13/5/036 | null | gr-qc | null | Description of the magnetic Bianchi VI$_0$ cosmologies of LeBlanc, Kerr, and
Wainwright in the formalisms both of Belinskii, Khalatnikov, and Lifshitz, and
of Misner allows qualitative understanding of the Mixmaster-like singularity in
those models.
| [
{
"created": "Fri, 1 Dec 1995 21:31:48 GMT",
"version": "v1"
}
] | 2009-10-28 | [
[
"Berger",
"Beverly K.",
""
]
] | Description of the magnetic Bianchi VI$_0$ cosmologies of LeBlanc, Kerr, and Wainwright in the formalisms both of Belinskii, Khalatnikov, and Lifshitz, and of Misner allows qualitative understanding of the Mixmaster-like singularity in those models. |
1909.06967 | I.K. Hong | I. K. Hong, C. S. Kim, G. H. Min | Curvature Spinors in Locally Inertial Frame and the Relations with
Sedenion | 24 pages, 4 tables | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the 2-spinor formalism, the gravity can be dealt with curvature spinors
with four spinor indices. Here we show a new effective method to express the
components of curvature spinors in the rank-2 $4 \times 4$ tensor
representation for the gravity in a locally inertial frame. In the process we
have developed a few m... | [
{
"created": "Mon, 16 Sep 2019 03:29:54 GMT",
"version": "v1"
}
] | 2019-09-17 | [
[
"Hong",
"I. K.",
""
],
[
"Kim",
"C. S.",
""
],
[
"Min",
"G. H.",
""
]
] | In the 2-spinor formalism, the gravity can be dealt with curvature spinors with four spinor indices. Here we show a new effective method to express the components of curvature spinors in the rank-2 $4 \times 4$ tensor representation for the gravity in a locally inertial frame. In the process we have developed a few man... |
0909.1228 | Philippe Grandclement | Philippe Grandclement (LUTH) | Kadath: a spectral solver for theoretical physics | Accepted to Journal of Computational Physics | Journal of Computational Physics 229 (2010) 3334-3357 | 10.1016/j.jcp.2010.01.005 | null | gr-qc hep-th physics.comp-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Kadath is a library that implements spectral methods in a very modular
manner. It is designed to solve a wide class of problems that arise in the
context of theoretical physics. Several types of coordinates are implemented
and additional geometries can be easily encoded. Partial differential equations
of various type... | [
{
"created": "Mon, 7 Sep 2009 11:58:07 GMT",
"version": "v1"
},
{
"created": "Sat, 16 Jan 2010 10:54:25 GMT",
"version": "v2"
}
] | 2014-08-29 | [
[
"Grandclement",
"Philippe",
"",
"LUTH"
]
] | Kadath is a library that implements spectral methods in a very modular manner. It is designed to solve a wide class of problems that arise in the context of theoretical physics. Several types of coordinates are implemented and additional geometries can be easily encoded. Partial differential equations of various types ... |
1101.0996 | Peter Komorowski | P. G. Komorowski, S. R. Valluri, M. Houde | The Carter Constant for Inclined Orbits About a Massive Kerr Black Hole:
near-circular, near-polar orbits | 35 Pages, 1 figure, Accepted for publication in Cent Eur J Phys | null | 10.2478/s11534-012-0043-x | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In an extreme mass-ratio binary black hole system, a non-equatorial orbit
will list (i.e. increase its angle of inclination, {\iota}) as it evolves in
Kerr spacetime. The abutment, a set of evolving, near-polar, retrograde orbits,
for which the instantaneous Carter constant (Q) is at its maximum value (Q_{X})
for giv... | [
{
"created": "Wed, 5 Jan 2011 14:52:18 GMT",
"version": "v1"
},
{
"created": "Sun, 15 May 2011 16:08:06 GMT",
"version": "v2"
},
{
"created": "Thu, 19 May 2011 16:11:03 GMT",
"version": "v3"
},
{
"created": "Thu, 21 Jul 2011 01:44:06 GMT",
"version": "v4"
},
{
"cr... | 2015-05-20 | [
[
"Komorowski",
"P. G.",
""
],
[
"Valluri",
"S. R.",
""
],
[
"Houde",
"M.",
""
]
] | In an extreme mass-ratio binary black hole system, a non-equatorial orbit will list (i.e. increase its angle of inclination, {\iota}) as it evolves in Kerr spacetime. The abutment, a set of evolving, near-polar, retrograde orbits, for which the instantaneous Carter constant (Q) is at its maximum value (Q_{X}) for given... |
gr-qc/0112043 | Annalisa Marzuoli | G.Carbone, M.Carfora and A. Marzuoli | Quantum states of elementary three-geometry | 15 pages, LaTex | Class.Quant.Grav. 19 (2002) 3761-3774 | 10.1088/0264-9381/19/14/315 | LPENSL-TH 09/2001 and FNT-T 09/2001 | gr-qc | null | We introduce a quantum volume operator $K$ in three--dimensional Quantum
Gravity by taking into account a symmetrical coupling scheme of three SU(2)
angular momenta. The spectrum of $K$ is discrete and defines a complete set of
eigenvectors which is alternative with respect to the complete sets employed
when the usua... | [
{
"created": "Tue, 18 Dec 2001 14:42:16 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Carbone",
"G.",
""
],
[
"Carfora",
"M.",
""
],
[
"Marzuoli",
"A.",
""
]
] | We introduce a quantum volume operator $K$ in three--dimensional Quantum Gravity by taking into account a symmetrical coupling scheme of three SU(2) angular momenta. The spectrum of $K$ is discrete and defines a complete set of eigenvectors which is alternative with respect to the complete sets employed when the usual ... |
1509.01667 | Ivan Kolar | Ivan Kolar, Pavel Krtous | Spacetimes with a separable Klein-Gordon equation in higher dimensions | 12 pages, no figures | Phys. Rev. D 93, 024053 (2016) | 10.1103/PhysRevD.93.024053 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study spacetimes that lead to a separable Klein-Gordon equation in a
general dimension. We introduce an ansatz for the metric in higher dimensions
motivated by analogical work by Carter in four dimensions and find solutions of
the Klein-Gordon equation. For such a metric we solve the Einstein equations
and regain ... | [
{
"created": "Sat, 5 Sep 2015 06:25:56 GMT",
"version": "v1"
},
{
"created": "Tue, 29 Sep 2015 14:05:34 GMT",
"version": "v2"
},
{
"created": "Mon, 8 Feb 2016 22:58:35 GMT",
"version": "v3"
}
] | 2016-02-10 | [
[
"Kolar",
"Ivan",
""
],
[
"Krtous",
"Pavel",
""
]
] | We study spacetimes that lead to a separable Klein-Gordon equation in a general dimension. We introduce an ansatz for the metric in higher dimensions motivated by analogical work by Carter in four dimensions and find solutions of the Klein-Gordon equation. For such a metric we solve the Einstein equations and regain th... |
2305.05595 | Mohammad Reza Alipour | Mohammad Reza Alipour, Mohammad Ali S. Afshar, Saeed Noori Gashti,
Jafar Sadeghi | Topological classification and black hole thermodynamics | Accepted for publication in Physics of the Dark Universe. 20 pages,
12 figures, 2 Tables (This work is dedicated to the memory of Zohreh Sadeghi
of the University of Washington, Tacoma, USA, (daughter of Prof. J. Sadeghi).
For her diligent correction of the English texts of our papers.). Physics of
the Dark Uni... | Phys. Dark Univ. 42, 101361 (2023) | 10.1016/j.dark.2023.101361 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | One of the new methods that can be used to study the thermodynamics critical
points of a system based on a topological approach is the study of topological
charges using Duan's $\phi$-mapping method. In this article, we will attempt to
use this method to study three different black holes, each with different
coeffici... | [
{
"created": "Tue, 9 May 2023 16:37:17 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Oct 2023 12:35:39 GMT",
"version": "v2"
}
] | 2023-12-22 | [
[
"Alipour",
"Mohammad Reza",
""
],
[
"Afshar",
"Mohammad Ali S.",
""
],
[
"Gashti",
"Saeed Noori",
""
],
[
"Sadeghi",
"Jafar",
""
]
] | One of the new methods that can be used to study the thermodynamics critical points of a system based on a topological approach is the study of topological charges using Duan's $\phi$-mapping method. In this article, we will attempt to use this method to study three different black holes, each with different coefficien... |
gr-qc/9708034 | B. S. Sathyaprakash | Thibault Damour (Institut des Hautes Etudes Scientifiques and DARC,
CNRS), Bala R. Iyer (Raman Research Institute) and B.S. Sathyaprakash
(Cardiff University of Wales and Caltech) | Improved filters for gravitational waves from inspiralling compact
binaries | Latex ([prd,aps,eqsecnum,epsf]{revtex}), 40 pages including 12
encapsulated figures. (The paper, together with all the figures and tables is
available from ftp://carina.astro.cf.ac.uk/pub/incoming/sathya/dis97.uu) | Phys.Rev. D57 (1998) 885-907 | 10.1103/PhysRevD.57.885 | null | gr-qc | null | The order of the post-Newtonian expansion needed, to extract in a reliable
and accurate manner the fully general relativistic gravitational wave signal
from inspiralling compact binaries, is explored. A class of approximate wave
forms, called P-approximants, is constructed based on the following two inputs:
(a) The i... | [
{
"created": "Mon, 18 Aug 1997 08:52:17 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Damour",
"Thibault",
"",
"Institut des Hautes Etudes Scientifiques and DARC,\n CNRS"
],
[
"Iyer",
"Bala R.",
"",
"Raman Research Institute"
],
[
"Sathyaprakash",
"B. S.",
"",
"Cardiff University of Wales and Caltech"
]
] | The order of the post-Newtonian expansion needed, to extract in a reliable and accurate manner the fully general relativistic gravitational wave signal from inspiralling compact binaries, is explored. A class of approximate wave forms, called P-approximants, is constructed based on the following two inputs: (a) The int... |
2112.01931 | Diego Pavon | Diego Pav\'on | The entropy of Hawking radiation and the generalized second law | 14 pages, six figures. Comments welcome | null | null | null | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by/4.0/ | We derive an approximate expression for the entropy of Hawking radiation
filling a spherical box in stable thermodynamic equilibrium with the
Schwarzschild black hole that produced the said radiation. The Bekenstein
entropy bound is satisfied but the generalized second law might not be always
guaranteed. We briefly d... | [
{
"created": "Thu, 2 Dec 2021 08:36:43 GMT",
"version": "v1"
}
] | 2021-12-10 | [
[
"Pavón",
"Diego",
""
]
] | We derive an approximate expression for the entropy of Hawking radiation filling a spherical box in stable thermodynamic equilibrium with the Schwarzschild black hole that produced the said radiation. The Bekenstein entropy bound is satisfied but the generalized second law might not be always guaranteed. We briefly dis... |
1502.05278 | Ra\'ul Carballo-Rubio | Ra\'ul Carballo-Rubio | Longitudinal diffeomorphisms obstruct the protection of vacuum energy | V1: 5 pages; V2: 9 pages, expanded discussion and additional
technical details. References added. No physics changes. This version
accepted for publication in Phys. Rev. D | Phys. Rev. D 91, 124071 (2015) | 10.1103/PhysRevD.91.124071 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | To guarantee the stability of the cosmological constant sector against
radiative corrections coming from quantum matter fields, one of the most
natural ingredients to invoke is the symmetry under scale transformations of
the gravitational field. Previous attempts to follow this path have
nevertheless failed in provid... | [
{
"created": "Wed, 18 Feb 2015 15:45:15 GMT",
"version": "v1"
},
{
"created": "Tue, 2 Jun 2015 19:31:22 GMT",
"version": "v2"
}
] | 2015-07-01 | [
[
"Carballo-Rubio",
"Raúl",
""
]
] | To guarantee the stability of the cosmological constant sector against radiative corrections coming from quantum matter fields, one of the most natural ingredients to invoke is the symmetry under scale transformations of the gravitational field. Previous attempts to follow this path have nevertheless failed in providin... |
2010.11829 | Miriam Cabero | Miriam Cabero, Ashish Mahabal and Jess McIver | GWSkyNet: a real-time classifier for public gravitational-wave
candidates | null | Astroph.J.Lett. 904, L9 (2020) | 10.3847/2041-8213/abc5b5 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The rapid release of accurate sky localization for gravitational-wave
candidates is crucial for multi-messenger observations. During the third
observing run of Advanced LIGO and Advanced Virgo, automated gravitational-wave
alerts were publicly released within minutes of detection. Subsequent
inspection and analysis r... | [
{
"created": "Thu, 22 Oct 2020 16:06:34 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jan 2021 03:17:05 GMT",
"version": "v2"
}
] | 2021-01-22 | [
[
"Cabero",
"Miriam",
""
],
[
"Mahabal",
"Ashish",
""
],
[
"McIver",
"Jess",
""
]
] | The rapid release of accurate sky localization for gravitational-wave candidates is crucial for multi-messenger observations. During the third observing run of Advanced LIGO and Advanced Virgo, automated gravitational-wave alerts were publicly released within minutes of detection. Subsequent inspection and analysis res... |
gr-qc/0506116 | Jonathan R. Gair | Jonathan Gair and Linqing Wen | Detecting extreme mass ratio inspirals with LISA using time-frequency
methods II: search characterization | 15 pages, 9 figures, to appear in proceedings of GWDAW 9, Annecy,
France, December 2004 | Class.Quant.Grav. 22 (2005) S1359-S1371 | 10.1088/0264-9381/22/18/S49 | null | gr-qc astro-ph | null | The inspirals of stellar-mass compact objects into supermassive black holes
constitute some of the most important sources for LISA. Detection of these
sources using fully coherent matched filtering is computationally intractable,
so alternative approaches are required. In a previous paper (Wen and Gair 2005,
gr-qc/05... | [
{
"created": "Thu, 23 Jun 2005 16:01:07 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Gair",
"Jonathan",
""
],
[
"Wen",
"Linqing",
""
]
] | The inspirals of stellar-mass compact objects into supermassive black holes constitute some of the most important sources for LISA. Detection of these sources using fully coherent matched filtering is computationally intractable, so alternative approaches are required. In a previous paper (Wen and Gair 2005, gr-qc/0502... |
2010.07663 | Yu-Tong Wang | Yu-Tong Wang, Yun-Song Piao | Searching for gravitational wave echoes in GWTC-1 and O3 events | null | null | null | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational wave (GW) echoes, if they exist, would be a probe to the
near-horizon physics of black hole. In this brief report, we performed the
Monte Carlo Markov Chain analysis to search for echo signal in all GWTC-1 and
O3 GW events. We focus on the Insprial-Merger-Ringdown-Echo (IMRE) waveform,
and apply the Bay... | [
{
"created": "Thu, 15 Oct 2020 11:11:02 GMT",
"version": "v1"
}
] | 2020-10-16 | [
[
"Wang",
"Yu-Tong",
""
],
[
"Piao",
"Yun-Song",
""
]
] | Gravitational wave (GW) echoes, if they exist, would be a probe to the near-horizon physics of black hole. In this brief report, we performed the Monte Carlo Markov Chain analysis to search for echo signal in all GWTC-1 and O3 GW events. We focus on the Insprial-Merger-Ringdown-Echo (IMRE) waveform, and apply the Bayes... |
1703.09009 | Vasilis Oikonomou | V.K. Oikonomou | Inflation and Bounce from Classical and Loop Quantum Cosmology Imperfect
Fluids | IJMPD Accepted | null | 10.1142/S0218271817501103 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate how various inflationary and bouncing cosmologies can be
realized by imperfect fluids with a generalized equation of state, in the
context of both classical and loop quantum cosmology. With regards to the
inflationary cosmologies, we study the intermediate inflation scenario, the
$R^2$ inflation scenar... | [
{
"created": "Mon, 27 Mar 2017 11:08:44 GMT",
"version": "v1"
}
] | 2017-09-06 | [
[
"Oikonomou",
"V. K.",
""
]
] | We investigate how various inflationary and bouncing cosmologies can be realized by imperfect fluids with a generalized equation of state, in the context of both classical and loop quantum cosmology. With regards to the inflationary cosmologies, we study the intermediate inflation scenario, the $R^2$ inflation scenario... |
2112.03957 | Francisco Jos\'e Maldonado Torralba | \'Alvaro de la Cruz Dombriz, Francisco Jos\'e Maldonado Torralba,
David F. Mota | Dark matter candidate from torsion | 5 pages, 3 figures, 1 table | null | 10.1016/j.physletb.2022.137488 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The stable pseudo-scalar degree of freedom of the quadratic Poincar\'e Gauge
theory of gravity is shown to be a suitable dark matter candidate. We find the
parameter space of the theory which can account for all the predicted cold dark
matter, and constrain such parameters with astrophysical observations.
| [
{
"created": "Tue, 7 Dec 2021 19:29:27 GMT",
"version": "v1"
}
] | 2022-10-12 | [
[
"Dombriz",
"Álvaro de la Cruz",
""
],
[
"Torralba",
"Francisco José Maldonado",
""
],
[
"Mota",
"David F.",
""
]
] | The stable pseudo-scalar degree of freedom of the quadratic Poincar\'e Gauge theory of gravity is shown to be a suitable dark matter candidate. We find the parameter space of the theory which can account for all the predicted cold dark matter, and constrain such parameters with astrophysical observations. |
1309.3031 | Miguel Cruz | Rub\'en Cordero, Miguel Cruz, Alberto Molgado and Efra\'in Rojas | Quantum modified Regge-Teitelboim cosmology | 11 pages, 3 figures. Erratum on one of the institutional addresses.
Some minor changes | Gen. Relativ. Grav. 46 1761 (2014) | 10.1007/s10714-014-1761-8 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The canonical quantization of the modified geodetic brane cosmology which is
implemented from the Regge-Teitelboim model and the trace of the extrinsic
curvature of the brane trajectory, K, is developed. As a second-order
derivative model, on the grounds of the Ostrogradski Hamiltonian method and the
Dirac's scheme f... | [
{
"created": "Thu, 12 Sep 2013 04:44:51 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Jun 2014 23:23:43 GMT",
"version": "v2"
},
{
"created": "Wed, 25 Jun 2014 09:02:58 GMT",
"version": "v3"
}
] | 2014-06-26 | [
[
"Cordero",
"Rubén",
""
],
[
"Cruz",
"Miguel",
""
],
[
"Molgado",
"Alberto",
""
],
[
"Rojas",
"Efraín",
""
]
] | The canonical quantization of the modified geodetic brane cosmology which is implemented from the Regge-Teitelboim model and the trace of the extrinsic curvature of the brane trajectory, K, is developed. As a second-order derivative model, on the grounds of the Ostrogradski Hamiltonian method and the Dirac's scheme for... |
1711.06582 | Yousef Bisabr | Yousef Bisabr (Farzan-Nahad) | Inflation and Cosmological Constant | null | Phys. Scr. 96 (2021) 075002 | 10.1088/1402-4896/abf706 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In construction of an inflationary model, one usually assumes that the matter
sector of the gravitational action is minimally coupled to the background. It
means that the matter (inflaton) part of the action is coupled with the same
metric of the gravitational part. We elaborate on this assumption and
investigate som... | [
{
"created": "Wed, 15 Nov 2017 06:18:21 GMT",
"version": "v1"
},
{
"created": "Wed, 28 Nov 2018 13:53:06 GMT",
"version": "v2"
},
{
"created": "Mon, 24 May 2021 13:33:48 GMT",
"version": "v3"
}
] | 2021-05-25 | [
[
"Bisabr",
"Yousef",
"",
"Farzan-Nahad"
]
] | In construction of an inflationary model, one usually assumes that the matter sector of the gravitational action is minimally coupled to the background. It means that the matter (inflaton) part of the action is coupled with the same metric of the gravitational part. We elaborate on this assumption and investigate some ... |
2007.14393 | Angelo E. S. Hartmann | Mario Novello and Angelo E. S. Hartmann | Gravitational waves in the Spinor Theory of Gravity | 5 pages | Mod. Phys. Lett. A 36, N.02 (2021) 2150003 | 10.1142/S0217732321500036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze the gravitational waves within the Spinor Theory of Gravity and
compare it with the General Relativity proposal. In the case of STG a
gravitational wave may occur if the effective gravitational metric induced by
the spinorial field is Ricci flat.
| [
{
"created": "Tue, 28 Jul 2020 07:02:09 GMT",
"version": "v1"
},
{
"created": "Fri, 23 Apr 2021 12:23:57 GMT",
"version": "v2"
}
] | 2021-04-26 | [
[
"Novello",
"Mario",
""
],
[
"Hartmann",
"Angelo E. S.",
""
]
] | We analyze the gravitational waves within the Spinor Theory of Gravity and compare it with the General Relativity proposal. In the case of STG a gravitational wave may occur if the effective gravitational metric induced by the spinorial field is Ricci flat. |
0704.0456 | Daniel Arteaga | Daniel Arteaga | Particle propagation in cosmological backgrounds | 7 pages. To appear in the proceedings of the IRGAC 2006 conference | J.Phys.A40:6901-6906,2007 | 10.1088/1751-8113/40/25/S37 | null | gr-qc | null | We study the quantum propagation of particles in cosmological backgrounds, by
considering a doublet of massive scalar fields propagating in an expanding
universe, possibly filled with radiation. We focus on the dissipative effects
related to the expansion rate. At first order, we recover the expected result
that the ... | [
{
"created": "Tue, 3 Apr 2007 20:21:24 GMT",
"version": "v1"
}
] | 2009-09-29 | [
[
"Arteaga",
"Daniel",
""
]
] | We study the quantum propagation of particles in cosmological backgrounds, by considering a doublet of massive scalar fields propagating in an expanding universe, possibly filled with radiation. We focus on the dissipative effects related to the expansion rate. At first order, we recover the expected result that the de... |
gr-qc/9710097 | Jorge Pullin | Reinaldo Gleiser | Mass correction and gravitational energy radiation in black hole
perturbation theory | 10 pages, LaTeX, no figures | Class.Quant.Grav. 14 (1997) 1911 | 10.1088/0264-9381/14/7/023 | CGPG-97/10-3 | gr-qc | null | Using second order black hole perturbation theory, we show that the
difference between the ADM mass and the final black hole mass, computed to the
lowest significant order, is equal, to the same order, to the total
gravitational radiation energy, obtained applying the Landau and Lifschitz
(pseudotensor) equation to t... | [
{
"created": "Tue, 21 Oct 1997 01:32:51 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Gleiser",
"Reinaldo",
""
]
] | Using second order black hole perturbation theory, we show that the difference between the ADM mass and the final black hole mass, computed to the lowest significant order, is equal, to the same order, to the total gravitational radiation energy, obtained applying the Landau and Lifschitz (pseudotensor) equation to the... |
0903.3837 | Marco Valerio Battisti | Marco Valerio Battisti, Riccardo Belvedere and Giovanni Montani | Semi-classical isotropization of the Mixmaster Universe | 5 pages, to appear in the Proceedings of the 3rd Stueckelberg
Workshop, July 2008, Pescara - Italy | null | null | null | gr-qc | http://creativecommons.org/licenses/by/3.0/ | A semi-classical mechanism which leads to the isotropization of the Mixmaster
Universe is developed. A wave function of this Universe, which has a meaningful
probabilistic interpretation, is constructed and it describes the evolution of
the anisotropies of the Universe with respect to the isotropic scale factor,
whic... | [
{
"created": "Mon, 23 Mar 2009 11:31:48 GMT",
"version": "v1"
}
] | 2009-03-24 | [
[
"Battisti",
"Marco Valerio",
""
],
[
"Belvedere",
"Riccardo",
""
],
[
"Montani",
"Giovanni",
""
]
] | A semi-classical mechanism which leads to the isotropization of the Mixmaster Universe is developed. A wave function of this Universe, which has a meaningful probabilistic interpretation, is constructed and it describes the evolution of the anisotropies of the Universe with respect to the isotropic scale factor, which ... |
gr-qc/9912024 | null | Theodore G. Erler IV (Physics, UC Santa Barbara) | The Mathematics of the Spinning Particle Problem | 18 pages, LaTeX, no figures. Submitted to Proceedings of the 5th
International Conference on Clifford Algebras and their Applications in
Mathematical Physics, Ixtapa-Zihuatanejo, Mexico, June 27-July 4, 1999, (R.
Ablamowicz and B. Fauser eds.). Presentation slides available at
http://www.clifford.org/~terler/ta... | null | null | ERLER9901, clf-alg/erle9901 | gr-qc | null | We introduce an original approach to geometric calculus in which we define
derivatives and integrals on functions which depend on extended bodies in
space--that is, paths, surfaces, and volumes etc. Though this theory remains to
be fully completed, we present it at its current stage of development, and
discuss it's c... | [
{
"created": "Wed, 8 Dec 1999 01:07:02 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Erler",
"Theodore G.",
"IV",
"Physics, UC Santa Barbara"
]
] | We introduce an original approach to geometric calculus in which we define derivatives and integrals on functions which depend on extended bodies in space--that is, paths, surfaces, and volumes etc. Though this theory remains to be fully completed, we present it at its current stage of development, and discuss it's con... |
1405.7472 | Kei Yamada | Daiki Kikuchi, Naoya Omoto, Kei Yamada, Hideki Asada | Possible altitudinal, latitudinal and directional dependence of
relativistic Sagnac effect in Chern-Simons modified gravity | 14 pages, 3 figures, accepted by PRD | null | 10.1103/PhysRevD.90.064036 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Toward a test of parity violation in a gravity theory, possible effects of
Chern-Simons (CS) gravity on an interferometer have been recently discussed.
Continuing work initiated in an earlier publication [Okawara, Yamada and Asada,
Phys. Rev. Lett. 109, 231101 (2012)], we study possible altitudinal and
directional de... | [
{
"created": "Thu, 29 May 2014 06:22:03 GMT",
"version": "v1"
},
{
"created": "Sun, 7 Sep 2014 19:35:47 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Kikuchi",
"Daiki",
""
],
[
"Omoto",
"Naoya",
""
],
[
"Yamada",
"Kei",
""
],
[
"Asada",
"Hideki",
""
]
] | Toward a test of parity violation in a gravity theory, possible effects of Chern-Simons (CS) gravity on an interferometer have been recently discussed. Continuing work initiated in an earlier publication [Okawara, Yamada and Asada, Phys. Rev. Lett. 109, 231101 (2012)], we study possible altitudinal and directional depe... |
1604.03828 | Parampreet Singh | Parampreet Singh | Is classical flat Kasner spacetime flat in quantum gravity? | 14 pages, 2 figures. Prepared for IJMPD special issue on Loop Quantum
Cosmology | Int. J. Mod. Phys D, 25, 1642001 (2016) | 10.1142/S0218271816420013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Quantum nature of classical flat Kasner spacetime is studied using effective
spacetime description in loop quantum cosmology. We find that even though the
spacetime curvature vanishes at the classical level, non-trivial quantum
gravitational effects can arise. For the standard loop quantization of
Bianchi-I spacetime... | [
{
"created": "Wed, 13 Apr 2016 15:25:43 GMT",
"version": "v1"
}
] | 2017-04-14 | [
[
"Singh",
"Parampreet",
""
]
] | Quantum nature of classical flat Kasner spacetime is studied using effective spacetime description in loop quantum cosmology. We find that even though the spacetime curvature vanishes at the classical level, non-trivial quantum gravitational effects can arise. For the standard loop quantization of Bianchi-I spacetime, ... |
1405.4861 | Vitor Cardoso | Hirotada Okawa, Vitor Cardoso | Black holes and fundamental fields: hair, kicks and a gravitational
"Magnus" effect | 5 pages, RevTex4 | Phys. Rev. D 90, 104040 (2014) | 10.1103/PhysRevD.90.104040 | null | gr-qc astro-ph.HE hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scalar fields pervade theoretical physics and are a fundamental ingredient to
solve the dark matter problem, to realize the Peccei-Quinn mechanism in QCD or
the string-axiverse scenario. They are also a useful proxy for more complex
matter interactions, such as accretion disks or matter in extreme conditions.
Here, w... | [
{
"created": "Mon, 19 May 2014 20:00:06 GMT",
"version": "v1"
}
] | 2014-12-03 | [
[
"Okawa",
"Hirotada",
""
],
[
"Cardoso",
"Vitor",
""
]
] | Scalar fields pervade theoretical physics and are a fundamental ingredient to solve the dark matter problem, to realize the Peccei-Quinn mechanism in QCD or the string-axiverse scenario. They are also a useful proxy for more complex matter interactions, such as accretion disks or matter in extreme conditions. Here, we ... |
1109.3158 | Andreas Kreienbuehl | Andreas Kreienbuehl, Viqar Husain, and Sanjeev S. Seahra | Model for gravitational collapse in effective quantum gravity | 4 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a non-perturbative approach to studying the gravitational
collapse of a scalar field in spherical symmetry with quantum gravity
corrections. Quantum effects are described by a phase space function that
modifies the constraints of general relativity but does not affect the closure
of their algebra. The mod... | [
{
"created": "Wed, 14 Sep 2011 18:23:45 GMT",
"version": "v1"
}
] | 2011-09-15 | [
[
"Kreienbuehl",
"Andreas",
""
],
[
"Husain",
"Viqar",
""
],
[
"Seahra",
"Sanjeev S.",
""
]
] | We describe a non-perturbative approach to studying the gravitational collapse of a scalar field in spherical symmetry with quantum gravity corrections. Quantum effects are described by a phase space function that modifies the constraints of general relativity but does not affect the closure of their algebra. The model... |
2202.01921 | Salim Shekh Dr. | M. Koussour, S. H. Shekh, M. Bennai | Cosmic acceleration and energy conditions in $\Lambda$CDM symmetric
teleparallel $f(Q)$ gravity | 13 pages, 11 figures | Journal of High Energy Astrophysics 35 (2022) 43-51 | 10.1016/j.jheap.2022.05.002 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study a spatially homogeneous and isotropic FLRW
cosmological model in framework of the symmetric teleparallel $f(Q)$ gravity
proposed by Jimenez et al. (Physical Review D 98.4 (2018): 044048), where the
non-metricity $Q$ is responsible for the gravitational interaction. For the
whole analysis we ha... | [
{
"created": "Fri, 21 Jan 2022 11:42:54 GMT",
"version": "v1"
}
] | 2022-08-30 | [
[
"Koussour",
"M.",
""
],
[
"Shekh",
"S. H.",
""
],
[
"Bennai",
"M.",
""
]
] | In this paper, we study a spatially homogeneous and isotropic FLRW cosmological model in framework of the symmetric teleparallel $f(Q)$ gravity proposed by Jimenez et al. (Physical Review D 98.4 (2018): 044048), where the non-metricity $Q$ is responsible for the gravitational interaction. For the whole analysis we have... |
2108.04083 | John Klauder | John R. Klauder | A Simple Factor in Canonical Quantization yields Affine Quantization
Even for Quantum Gravity | 6 pages; a simple introduction to affine quantization that even helps
quantum gravity | null | null | null | gr-qc quant-ph | http://creativecommons.org/licenses/by/4.0/ | Canonical quantization (CQ) is built around $[Q,P]=i\hbar1\!\!1$, while
affine quantization (AQ) is built around $[Q,D]=i\hbar\,Q$, where
$D\equiv(PQ+QP)/2$. The basic CQ operators must fit $-\infty< P, Q <\infty$,
while the basic AQ operators can fit $-\infty<P<\infty$ and $ 0<Q<\infty$,
$-\infty <Q<0$, or even $-\i... | [
{
"created": "Fri, 6 Aug 2021 12:14:23 GMT",
"version": "v1"
}
] | 2021-08-10 | [
[
"Klauder",
"John R.",
""
]
] | Canonical quantization (CQ) is built around $[Q,P]=i\hbar1\!\!1$, while affine quantization (AQ) is built around $[Q,D]=i\hbar\,Q$, where $D\equiv(PQ+QP)/2$. The basic CQ operators must fit $-\infty< P, Q <\infty$, while the basic AQ operators can fit $-\infty<P<\infty$ and $ 0<Q<\infty$, $-\infty <Q<0$, or even $-\inf... |
gr-qc/0506055 | Graham Woan | Richard Umst\"atter, Nelson Christensen, Martin Hendry, Renate Meyer,
Vimal Simha, John Veitch, Sarah Vigeland, Graham Woan | Bayesian modeling of source confusion in LISA data | 29 pages, 8 figures | Phys.Rev. D72 (2005) 022001 | 10.1103/PhysRevD.72.022001 | null | gr-qc | null | One of the greatest data analysis challenges for the Laser Interferometer
Space Antenna (LISA) is the need to account for a large number of gravitational
wave signals from compact binary systems expected to be present in the data. We
introduce the basis of a Bayesian method that we believe can address this
challenge,... | [
{
"created": "Thu, 9 Jun 2005 14:37:45 GMT",
"version": "v1"
}
] | 2009-11-11 | [
[
"Umstätter",
"Richard",
""
],
[
"Christensen",
"Nelson",
""
],
[
"Hendry",
"Martin",
""
],
[
"Meyer",
"Renate",
""
],
[
"Simha",
"Vimal",
""
],
[
"Veitch",
"John",
""
],
[
"Vigeland",
"Sarah",
""
],
[
... | One of the greatest data analysis challenges for the Laser Interferometer Space Antenna (LISA) is the need to account for a large number of gravitational wave signals from compact binary systems expected to be present in the data. We introduce the basis of a Bayesian method that we believe can address this challenge, a... |
1908.01647 | Tao Zhou | Zonghai Li, Guansheng He, and Tao Zhou | Gravitational deflection of relativistic massive particles by wormholes | 9 pages, 2 figures, version accepted for publication in Phys. Rev. D | Phys. Rev. D 101, 044001 (2020) | 10.1103/PhysRevD.101.044001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the gravitational deflection of relativistic massive particles
up to the second post-Minkowskian order by static and spherically symmetric
wormholes is investigated in the weak-field limit. These wormholes include the
Janis-Newman-Winicour wormhole, a class of zero Ricci scalar scalar-tensor
wormholes,... | [
{
"created": "Mon, 5 Aug 2019 14:35:27 GMT",
"version": "v1"
},
{
"created": "Tue, 28 Jan 2020 04:03:36 GMT",
"version": "v2"
}
] | 2020-02-05 | [
[
"Li",
"Zonghai",
""
],
[
"He",
"Guansheng",
""
],
[
"Zhou",
"Tao",
""
]
] | In this paper, the gravitational deflection of relativistic massive particles up to the second post-Minkowskian order by static and spherically symmetric wormholes is investigated in the weak-field limit. These wormholes include the Janis-Newman-Winicour wormhole, a class of zero Ricci scalar scalar-tensor wormholes, a... |
2404.09936 | Angel Rincon | R. D. B. Fontana and Angel Rincon | Accelerated black holes in (2+1) dimensions: Quasinormal modes and
Stability | 12 pages, 2 figures, 4 tables | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the propagation of a scalar field in a $(2+1)$-dimensional
accelerated black hole, recently revisited in \cite{Arenas_Henriquez_2022}. We
briefly describe the minimally-coupled configuration as rendering a trivial
scalar perturbation with a rescale of the field mass. On the contrary, the free
scalar fi... | [
{
"created": "Mon, 15 Apr 2024 17:03:14 GMT",
"version": "v1"
}
] | 2024-04-16 | [
[
"Fontana",
"R. D. B.",
""
],
[
"Rincon",
"Angel",
""
]
] | We investigate the propagation of a scalar field in a $(2+1)$-dimensional accelerated black hole, recently revisited in \cite{Arenas_Henriquez_2022}. We briefly describe the minimally-coupled configuration as rendering a trivial scalar perturbation with a rescale of the field mass. On the contrary, the free scalar fiel... |
gr-qc/0402095 | Valery Kiselev | V.V.Kiselev | Vector field as a quintessence partner | 14 pages, LaTeX file, iopart class, discussion extended, reference
added | Class.Quant.Grav. 21 (2004) 3323-3336 | 10.1088/0264-9381/21/13/014 | null | gr-qc astro-ph hep-ph | null | We derive generic equations for a vector field driving the evolution of flat
homogeneous isotropic universe and give a comparison with a scalar filed
dynamics in the cosmology. Two exact solutions are shown as examples, which can
serve to describe an inflation and a slow falling down of dynamical
``cosmological const... | [
{
"created": "Mon, 23 Feb 2004 10:11:57 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Mar 2004 08:54:19 GMT",
"version": "v2"
},
{
"created": "Thu, 25 Mar 2004 08:12:17 GMT",
"version": "v3"
},
{
"created": "Fri, 7 May 2004 07:43:43 GMT",
"version": "v4"
}
] | 2009-11-10 | [
[
"Kiselev",
"V. V.",
""
]
] | We derive generic equations for a vector field driving the evolution of flat homogeneous isotropic universe and give a comparison with a scalar filed dynamics in the cosmology. Two exact solutions are shown as examples, which can serve to describe an inflation and a slow falling down of dynamical ``cosmological constan... |
gr-qc/0603096 | Thomas Sotiriou | Thomas P. Sotiriou and Stefano Liberati | Field equations from a surface term | Typos corrected, minor changes to match published version | Phys.Rev. D74 (2006) 044016 | 10.1103/PhysRevD.74.044016 | null | gr-qc hep-th | null | As is well known, in order for the Einstein--Hilbert action to have a well
defined variation, and therefore to be used for deriving field equation through
the stationary action principle, it has to be amended by the addition of a
suitable boundary term. It has recently been claimed that, if one constructs an
action b... | [
{
"created": "Fri, 24 Mar 2006 12:25:35 GMT",
"version": "v1"
},
{
"created": "Fri, 9 Jun 2006 19:30:07 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Jul 2006 17:05:33 GMT",
"version": "v3"
},
{
"created": "Wed, 16 Aug 2006 13:20:20 GMT",
"version": "v4"
}
] | 2007-05-23 | [
[
"Sotiriou",
"Thomas P.",
""
],
[
"Liberati",
"Stefano",
""
]
] | As is well known, in order for the Einstein--Hilbert action to have a well defined variation, and therefore to be used for deriving field equation through the stationary action principle, it has to be amended by the addition of a suitable boundary term. It has recently been claimed that, if one constructs an action by ... |
1011.2052 | Jarmo M\"akel\"a Dr. | Jarmo M\"akel\"a | On Distance and Area | 6 pages, no figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We seek for an alternative to the metric tensor $g_{\mu\nu}$ as a fundamental
geometrical object in four-dimensional Riemannian manifolds. We suggest that
the metric tensor $g_{\mu\nu}(P)$ at a given point $P$ of a manifold may be
replaced by a four-dimensional geometrical simplex $\sigma^^4(P)$ embedded to
the tange... | [
{
"created": "Tue, 9 Nov 2010 11:56:12 GMT",
"version": "v1"
}
] | 2010-11-10 | [
[
"Mäkelä",
"Jarmo",
""
]
] | We seek for an alternative to the metric tensor $g_{\mu\nu}$ as a fundamental geometrical object in four-dimensional Riemannian manifolds. We suggest that the metric tensor $g_{\mu\nu}(P)$ at a given point $P$ of a manifold may be replaced by a four-dimensional geometrical simplex $\sigma^^4(P)$ embedded to the tangent... |
2309.05108 | Gui-Rong Liang | Nayun Jia, Yin-Da Guo, Gui-Rong Liang, Zhan-Feng Mai, Xin Zhang | Superradiant anomaly magnification in evolution of vector bosonic
condensates bounded by a Kerr black hole with near-horizon reflection | null | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Ultralight vector particles can form evolving condensates around a Kerr black
hole (BH) due to superradiant instability. We study the effect of near-horizon
reflection on the evolution of this system; by matching three pieces of
asymptotic expansions of the Proca equation in Kerr metric and considering the
leading or... | [
{
"created": "Sun, 10 Sep 2023 18:30:29 GMT",
"version": "v1"
}
] | 2023-09-12 | [
[
"Jia",
"Nayun",
""
],
[
"Guo",
"Yin-Da",
""
],
[
"Liang",
"Gui-Rong",
""
],
[
"Mai",
"Zhan-Feng",
""
],
[
"Zhang",
"Xin",
""
]
] | Ultralight vector particles can form evolving condensates around a Kerr black hole (BH) due to superradiant instability. We study the effect of near-horizon reflection on the evolution of this system; by matching three pieces of asymptotic expansions of the Proca equation in Kerr metric and considering the leading orde... |
gr-qc/0604050 | Anjan Ananda Sen | A. A. Sen | Tachyon Matter in Loop Quantum Cosmology | 5 pages, Revtex style. Title changed. Some general comments and
references added. No major changes. Accepted for publication in Phys. Rev.D | Phys.Rev. D74 (2006) 043501 | 10.1103/PhysRevD.74.043501 | null | gr-qc astro-ph hep-th | null | An analytical approach for studying the cosmological scenario with a
homogeneous tachyon field within the framework of loop quantum gravity is
developed. Our study is based on the semi-classical regime where space time can
be approximated as a continuous manifold, but matter Hamiltonian gets
non-perturbative quantum ... | [
{
"created": "Mon, 10 Apr 2006 19:16:47 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Jul 2006 21:01:35 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Sen",
"A. A.",
""
]
] | An analytical approach for studying the cosmological scenario with a homogeneous tachyon field within the framework of loop quantum gravity is developed. Our study is based on the semi-classical regime where space time can be approximated as a continuous manifold, but matter Hamiltonian gets non-perturbative quantum co... |
gr-qc/0309050 | Sawa Manoff | Sawa Manoff | Propagation of signals in spaces with affine connections and metrics as
models of space-time | 65 pages, LaTex | Fiz.Elem.Chast.Atom.Yadra 35 (2004) 1185-1258; Phys.Part.Nucl. 35
(2004) 633-674 | null | null | gr-qc | null | The propagation of signals in space-time is considered on the basis of the
notion of null (isotropic) vector field in spaces with affine connections and
metrics as models of space or of space-time. The Doppler effect is generalized
for these types of spaces. The notions of aberration, standard (longitudinal)
Doppler ... | [
{
"created": "Tue, 9 Sep 2003 09:50:29 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Manoff",
"Sawa",
""
]
] | The propagation of signals in space-time is considered on the basis of the notion of null (isotropic) vector field in spaces with affine connections and metrics as models of space or of space-time. The Doppler effect is generalized for these types of spaces. The notions of aberration, standard (longitudinal) Doppler ef... |
gr-qc/9512012 | Phil Fraundorf | P. Fraundorf (Physics and Astronomy/CME, U. Missouri-StL) | Three Self-Consistent Kinematics in (1+1)D Special Relativity | RevTeX, 3 tables and 1 figure available from the author and in prep
for a replacement preprint; also http://newton.umsl.edu/~run/ | null | null | UMStL-CME-951101pf | gr-qc | null | When introducing special relativity, an elegant connection to familiar rules
governing Galilean constant acceleration can be made, by describing first the
discovery at high speeds that the clocks (as well as odometers) of different
travelers may proceed at different rates. One may then show how to parameterize
any gi... | [
{
"created": "Wed, 6 Dec 1995 16:08:41 GMT",
"version": "v1"
}
] | 2009-09-25 | [
[
"Fraundorf",
"P.",
"",
"Physics and Astronomy/CME, U. Missouri-StL"
]
] | When introducing special relativity, an elegant connection to familiar rules governing Galilean constant acceleration can be made, by describing first the discovery at high speeds that the clocks (as well as odometers) of different travelers may proceed at different rates. One may then show how to parameterize any give... |
1203.4637 | Alejandro Aviles | Alejandro Aviles, Aztl\'an Bastarrachea-Almodovar, Lorena Campuzano,
and Hernando Quevedo | Extending the generalized Chaplygin gas model by using
geometrothermodynamics | 18 pages, 7 figures. Section added: Basics aspects of
geometrothermodynamics | Phys. Rev. D 86, 063508 (2012) | 10.1103/PhysRevD.86.063508 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We use the formalism of geometrothermodynamics (GTD) to derive fundamental
thermodynamic equations that are used to construct general relativistic
cosmological models. In particular, we show that the simplest possible
fundamental equation, which corresponds in GTD to a system with no internal
thermodynamic interactio... | [
{
"created": "Wed, 21 Mar 2012 02:29:27 GMT",
"version": "v1"
},
{
"created": "Sat, 8 Sep 2012 17:30:17 GMT",
"version": "v2"
}
] | 2013-05-30 | [
[
"Aviles",
"Alejandro",
""
],
[
"Bastarrachea-Almodovar",
"Aztlán",
""
],
[
"Campuzano",
"Lorena",
""
],
[
"Quevedo",
"Hernando",
""
]
] | We use the formalism of geometrothermodynamics (GTD) to derive fundamental thermodynamic equations that are used to construct general relativistic cosmological models. In particular, we show that the simplest possible fundamental equation, which corresponds in GTD to a system with no internal thermodynamic interaction,... |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.