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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
gr-qc/0507036 | Kristina Giesel | Kristina Giesel, Thomas Thiemann | Consistency Check on Volume and Triad Operator Quantisation in Loop
Quantum Gravity I | 21 pages, 5 figures | Class.Quant.Grav. 23 (2006) 5667-5692 | 10.1088/0264-9381/23/18/012 | AEI-2005-100 | gr-qc | null | The volume operator plays a pivotal role for the quantum dynamics of Loop
Quantum Gravity (LQG). It is essential in order to construct Triad operators
that enter the Hamiltonian constraint and which become densely defined
operators on the full Hilbert space even though in the classical theory the
triad becomes singul... | [
{
"created": "Fri, 8 Jul 2005 11:32:25 GMT",
"version": "v1"
},
{
"created": "Tue, 12 Jul 2005 15:13:59 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Giesel",
"Kristina",
""
],
[
"Thiemann",
"Thomas",
""
]
] | The volume operator plays a pivotal role for the quantum dynamics of Loop Quantum Gravity (LQG). It is essential in order to construct Triad operators that enter the Hamiltonian constraint and which become densely defined operators on the full Hilbert space even though in the classical theory the triad becomes singular... |
gr-qc/9207003 | Jim McCarthy | T. Damour (IHES and DARC) S. Deser (Brandeis University) J. McCarthy
(University of Adelaide) | Nonsymmetric Gravity Theories: Inconsistencies and a Cure | 34 pages | Phys.Rev.D47:1541-1556,1993 | 10.1103/PhysRevD.47.1541 | BRX TH-324 | gr-qc | null | Motivated by the apparent dependence of string $\sigma$--models on the sum of
spacetime metric and antisymmetric tensor fields, we reconsider gravity
theories constructed from a nonsymmetric metric. We first show that all such
"geometrical" theories homogeneous in second derivatives violate standard
physical requirem... | [
{
"created": "Wed, 22 Jul 1992 22:51:38 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Damour",
"T.",
"",
"IHES and DARC"
],
[
"Deser",
"S.",
"",
"Brandeis University"
],
[
"McCarthy",
"J.",
"",
"University of Adelaide"
]
] | Motivated by the apparent dependence of string $\sigma$--models on the sum of spacetime metric and antisymmetric tensor fields, we reconsider gravity theories constructed from a nonsymmetric metric. We first show that all such "geometrical" theories homogeneous in second derivatives violate standard physical requiremen... |
2303.06395 | Rajesh Kumar | Anjali Pandey, Rajesh Kumar and Sudhir Kumar Srivastava | Spherically symmetric gravitational collapse in the background of
Chaplygin gas | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper considers the spherically symmetric gravitational collapse in the
background of Chaplygin gas as dark energy component. The dark energy is
assumed to be generalized and modified Chaplygin gas. The exterior of the star
is considered to be Schwarzschild de-sitter/anti-de sitter metric and discusses
the junct... | [
{
"created": "Sat, 11 Mar 2023 12:08:22 GMT",
"version": "v1"
}
] | 2023-03-14 | [
[
"Pandey",
"Anjali",
""
],
[
"Kumar",
"Rajesh",
""
],
[
"Srivastava",
"Sudhir Kumar",
""
]
] | This paper considers the spherically symmetric gravitational collapse in the background of Chaplygin gas as dark energy component. The dark energy is assumed to be generalized and modified Chaplygin gas. The exterior of the star is considered to be Schwarzschild de-sitter/anti-de sitter metric and discusses the junctio... |
1309.2058 | Takashi Torii | Takashi Torii and Hisa-aki Shinkai | Wormholes in higher dimensional space-time: Exact solutions and their
linear stability analysis | 6 pages, 3 eps figures, LaTeX. Accepted for publication in Phys. Rev.
D | null | 10.1103/PhysRevD.88.064027 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the simplest traversable wormhole solutions in $n$-dimensional
general relativity, assuming static and spherically symmetric spacetime with a
ghost scalar field. This is the generalization of the Ellis solution (or the
so-called Morris-Thorne's traversable wormhole) into a higher-dimension. We
also study th... | [
{
"created": "Mon, 9 Sep 2013 07:36:03 GMT",
"version": "v1"
}
] | 2015-06-17 | [
[
"Torii",
"Takashi",
""
],
[
"Shinkai",
"Hisa-aki",
""
]
] | We derive the simplest traversable wormhole solutions in $n$-dimensional general relativity, assuming static and spherically symmetric spacetime with a ghost scalar field. This is the generalization of the Ellis solution (or the so-called Morris-Thorne's traversable wormhole) into a higher-dimension. We also study thei... |
1806.09259 | Jing-Bo Wang | Jingbo Wang | W-hairs of black holes in three dimensional spacetime | 7 pages, comments are welcomed | null | 10.1088/1674-1137/43/9/095104 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the previous paper (arXiv:1804.09438) we found that the near horizon
symmetry algebra of black holes is a subalgebra of the $W_{1+\infty}$ symmetry
algebra of quantum Hall fluid in three dimensional spacetime. In this paper, we
give a slightly different representation of the former algebra from the latter
one. Sim... | [
{
"created": "Mon, 25 Jun 2018 02:35:22 GMT",
"version": "v1"
}
] | 2019-09-04 | [
[
"Wang",
"Jingbo",
""
]
] | In the previous paper (arXiv:1804.09438) we found that the near horizon symmetry algebra of black holes is a subalgebra of the $W_{1+\infty}$ symmetry algebra of quantum Hall fluid in three dimensional spacetime. In this paper, we give a slightly different representation of the former algebra from the latter one. Simil... |
0712.1258 | Vasileios Paschalidis | Vasileios Paschalidis, Jakob Hansen, and Alexei Khokhlov | Numerical performance of the parabolized ADM (PADM) formulation of
General Relativity | 20 two column pages, 20 figures, submitted to PRD, two typos
corrected | Phys.Rev.D78:064048,2008 | 10.1103/PhysRevD.78.064048 | null | gr-qc | null | In a recent paper the first coauthor presented a new parabolic extension
(PADM) of the standard 3+1 Arnowitt, Deser, Misner formulation of the equations
of general relativity. By parabolizing first-order ADM in a certain way, the
PADM formulation turns it into a mixed hyperbolic - second-order parabolic,
well-posed s... | [
{
"created": "Sat, 8 Dec 2007 04:36:22 GMT",
"version": "v1"
},
{
"created": "Tue, 11 Dec 2007 22:27:25 GMT",
"version": "v2"
}
] | 2009-02-23 | [
[
"Paschalidis",
"Vasileios",
""
],
[
"Hansen",
"Jakob",
""
],
[
"Khokhlov",
"Alexei",
""
]
] | In a recent paper the first coauthor presented a new parabolic extension (PADM) of the standard 3+1 Arnowitt, Deser, Misner formulation of the equations of general relativity. By parabolizing first-order ADM in a certain way, the PADM formulation turns it into a mixed hyperbolic - second-order parabolic, well-posed sys... |
1810.09563 | Aaron Johnson | Aaron D. Johnson, Shasvath J. Kapadia, Andrew Osborne, Alex Hixon, and
Daniel Kennefick | Prospects of detecting the nonlinear gravitational wave memory | 14 pages, 10 figures, 1 tables | Phys. Rev. D 99, 044045 (2019) | 10.1103/PhysRevD.99.044045 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In GW150914, approximately $3M_{\odot}$ were radiated away as gravitational
waves from the binary black hole system as it merged. The stress energy of the
gravitational wave itself causes a nonlinear memory effect in the detectors
here on Earth called the Christodoulou memory. We use an approximation that can
be appl... | [
{
"created": "Mon, 22 Oct 2018 21:23:22 GMT",
"version": "v1"
},
{
"created": "Sat, 23 Feb 2019 16:42:06 GMT",
"version": "v2"
}
] | 2019-02-27 | [
[
"Johnson",
"Aaron D.",
""
],
[
"Kapadia",
"Shasvath J.",
""
],
[
"Osborne",
"Andrew",
""
],
[
"Hixon",
"Alex",
""
],
[
"Kennefick",
"Daniel",
""
]
] | In GW150914, approximately $3M_{\odot}$ were radiated away as gravitational waves from the binary black hole system as it merged. The stress energy of the gravitational wave itself causes a nonlinear memory effect in the detectors here on Earth called the Christodoulou memory. We use an approximation that can be applie... |
2005.03258 | Alessandro Pesci | Alessandro Pesci | Zero-point gravitational field equations | 17 pages; v2: some corrections/editing/clarifications, reference
added, it corresponds to the published version | Class. Quantum Grav. 38 (2021) 145007 | 10.1088/1361-6382/ac0310 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the recently reported qmetric (or zero-point-length) expressions of
the Ricci (bi)scalar $R_{(q)}$ (namely, expressions of the Ricci scalar in a
spacetime with a limit length $L_0$ built in), focusing specifically on the
case of null separated events. A feature of these expressions is that, when
considered i... | [
{
"created": "Thu, 7 May 2020 05:38:11 GMT",
"version": "v1"
},
{
"created": "Mon, 21 Jun 2021 09:19:42 GMT",
"version": "v2"
}
] | 2021-06-22 | [
[
"Pesci",
"Alessandro",
""
]
] | We study the recently reported qmetric (or zero-point-length) expressions of the Ricci (bi)scalar $R_{(q)}$ (namely, expressions of the Ricci scalar in a spacetime with a limit length $L_0$ built in), focusing specifically on the case of null separated events. A feature of these expressions is that, when considered in ... |
2004.02602 | Mubasher Jamil | Mustapha Azreg-A\"inou, Zihang Chen, Bojun Deng, Mubasher Jamil, Tao
Zhu, Qiang Wu, Yen-Kheng Lim | Orbital mechanics and quasiperiodic oscillation resonances of black
holes in Einstein-{\AE}ther theory | 21 pages, 17 captioned figures, accepted for publication in
Phys.Rev.D | Phys. Rev. D 102, 044028 (2020) | 10.1103/PhysRevD.102.044028 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, we study the motion of test particles around two exact charged
black-hole solutions in Einstein-{\AE}ther theory. Specifically, we first
consider the quasi-periodic oscillations (QPOs) and their resonances generated
by the particle moving in the Einstein-{\AE}ther black hole and then turn to
study the ... | [
{
"created": "Thu, 2 Apr 2020 06:56:00 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Aug 2020 01:20:30 GMT",
"version": "v2"
}
] | 2020-08-18 | [
[
"Azreg-Aïnou",
"Mustapha",
""
],
[
"Chen",
"Zihang",
""
],
[
"Deng",
"Bojun",
""
],
[
"Jamil",
"Mubasher",
""
],
[
"Zhu",
"Tao",
""
],
[
"Wu",
"Qiang",
""
],
[
"Lim",
"Yen-Kheng",
""
]
] | In this paper, we study the motion of test particles around two exact charged black-hole solutions in Einstein-{\AE}ther theory. Specifically, we first consider the quasi-periodic oscillations (QPOs) and their resonances generated by the particle moving in the Einstein-{\AE}ther black hole and then turn to study the pe... |
1511.08160 | Pedro Moraes | P.H.R.S. Moraes and R.A.C. Correa | Braneworld cosmology in $f(R,T)$ gravity | 6 pages, 1 figure | null | 10.1007/s10509-016-2677-4 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Braneworld scenarios consider our observable universe as a brane embedded in
a 5D space, named bulk. In this work, I derive the field equations of a
braneworld model in a generalized theory of gravitation, namely $f(R,T)$
gravity, with $R$ and $T$, representing the Ricci scalar and the trace of the
energy-momentum te... | [
{
"created": "Wed, 25 Nov 2015 19:06:32 GMT",
"version": "v1"
},
{
"created": "Thu, 21 Jan 2016 00:14:28 GMT",
"version": "v2"
}
] | 2016-02-17 | [
[
"Moraes",
"P. H. R. S.",
""
],
[
"Correa",
"R. A. C.",
""
]
] | Braneworld scenarios consider our observable universe as a brane embedded in a 5D space, named bulk. In this work, I derive the field equations of a braneworld model in a generalized theory of gravitation, namely $f(R,T)$ gravity, with $R$ and $T$, representing the Ricci scalar and the trace of the energy-momentum tens... |
1907.13089 | Wei-Can Syu | Wei-Can Syu, Da-Shin Lee and Kin-Wang Ng | Quantum loop effects to the power spectrum of primordial perturbations
during ultra slow-roll inflation | v3: 13 pages, 9 figures | Phys. Rev. D 101, 025013 (2020) | 10.1103/PhysRevD.101.025013 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine the quantum loop effects on the single-field inflationary models
in a spatially flat Friedmann-Robertson-Walker (FRW) cosmological space-time
with a general self-interacting scalar field potential, which is modeled in
terms of the Hubble flow parameters in the effective field theory approach. In
particular... | [
{
"created": "Sat, 27 Jul 2019 01:54:48 GMT",
"version": "v1"
},
{
"created": "Sat, 3 Aug 2019 05:28:43 GMT",
"version": "v2"
},
{
"created": "Thu, 30 Jan 2020 15:40:38 GMT",
"version": "v3"
}
] | 2020-02-05 | [
[
"Syu",
"Wei-Can",
""
],
[
"Lee",
"Da-Shin",
""
],
[
"Ng",
"Kin-Wang",
""
]
] | We examine the quantum loop effects on the single-field inflationary models in a spatially flat Friedmann-Robertson-Walker (FRW) cosmological space-time with a general self-interacting scalar field potential, which is modeled in terms of the Hubble flow parameters in the effective field theory approach. In particular, ... |
2006.05766 | Joao Magueijo | Joao Magueijo, Tom Zlosnik and Simone Speziale | Quantum cosmology of a dynamical Lambda | Version to be published in Phys.Rev.D | Phys. Rev. D 102, 064006 (2020) | 10.1103/PhysRevD.102.064006 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By allowing torsion into the gravitational dynamics one can promote the
cosmological constant, $\Lambda$, to a dynamical variable in a class of
quasi-topological theories. In this paper we perform a mini-superspace
quantization of these theories in the connection representation. If $\Lambda$
is kept fixed, the soluti... | [
{
"created": "Wed, 10 Jun 2020 10:47:43 GMT",
"version": "v1"
},
{
"created": "Mon, 31 Aug 2020 11:48:13 GMT",
"version": "v2"
}
] | 2020-09-16 | [
[
"Magueijo",
"Joao",
""
],
[
"Zlosnik",
"Tom",
""
],
[
"Speziale",
"Simone",
""
]
] | By allowing torsion into the gravitational dynamics one can promote the cosmological constant, $\Lambda$, to a dynamical variable in a class of quasi-topological theories. In this paper we perform a mini-superspace quantization of these theories in the connection representation. If $\Lambda$ is kept fixed, the solution... |
1007.3723 | William Nelson | Miguel Campiglia, Adam Henderson and William Nelson | Vertex Expansion for the Bianchi I model | 15 pages, 2 figures | Phys.Rev.D82:064036,2010 | 10.1103/PhysRevD.82.064036 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A perturbative expansion of Loop Quantum Cosmological transitions amplitudes
of Bianchi I models is performed. Following the procedure outlined in [1,2] for
isotropic models, it is shown that the resulting expansion can be written in
the form of a series of amplitudes each with a fixed number of transitions
mimicking... | [
{
"created": "Wed, 21 Jul 2010 19:12:01 GMT",
"version": "v1"
}
] | 2010-11-12 | [
[
"Campiglia",
"Miguel",
""
],
[
"Henderson",
"Adam",
""
],
[
"Nelson",
"William",
""
]
] | A perturbative expansion of Loop Quantum Cosmological transitions amplitudes of Bianchi I models is performed. Following the procedure outlined in [1,2] for isotropic models, it is shown that the resulting expansion can be written in the form of a series of amplitudes each with a fixed number of transitions mimicking a... |
gr-qc/0510086 | Sushil Srivastava | S. K. Srivastava | Dual Nature of the Ricci Scalar and its Certain Consequences | 118 pages, suggestions and comments welcome | null | null | null | gr-qc | null | Ricci scalar is the key ingredient of non-Newtonian theory of gravity, where
space-time geometry has a crucial role. Normally, it is supposed to be a
geometrical field, but interestingly it also behaves like a physical field.
Thus it plays dual role in the arena of gravitation. This article is an
overview of the work... | [
{
"created": "Wed, 19 Oct 2005 07:58:12 GMT",
"version": "v1"
},
{
"created": "Tue, 8 Nov 2005 09:38:31 GMT",
"version": "v2"
}
] | 2019-02-27 | [
[
"Srivastava",
"S. K.",
""
]
] | Ricci scalar is the key ingredient of non-Newtonian theory of gravity, where space-time geometry has a crucial role. Normally, it is supposed to be a geometrical field, but interestingly it also behaves like a physical field. Thus it plays dual role in the arena of gravitation. This article is an overview of the work r... |
gr-qc/0008030 | Ivan S. N. Booth | Ivan S. Booth | A quasilocal Hamiltonian for gravity with classical and quantum
applications | PhD Thesis from University of Waterloo, 199 pages, 10 figures | null | null | null | gr-qc | null | I modify the quasilocal energy formalism of Brown and York into a purely
Hamiltonian form. As part of the reformulation, I remove their restriction that
the time evolution of the boundary of the spacetime be orthogonal to the leaves
of the time foliation. Thus the new formulation allows an arbitrary evolution
of the ... | [
{
"created": "Mon, 14 Aug 2000 17:47:41 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Booth",
"Ivan S.",
""
]
] | I modify the quasilocal energy formalism of Brown and York into a purely Hamiltonian form. As part of the reformulation, I remove their restriction that the time evolution of the boundary of the spacetime be orthogonal to the leaves of the time foliation. Thus the new formulation allows an arbitrary evolution of the bo... |
1003.4767 | Milton Ruiz | Miguel Alcubierre, Juan C. Degollado, Dario Nunez, Milton Ruiz,
Marcelo Salgado | Dynamic transition to spontaneous scalarization in boson stars | Minor changes to match the final version to appear in PRD | Phys.Rev.D81:124018,2010 | 10.1103/PhysRevD.81.124018 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the phenomenon of spontaneous scalarization predicted in neutron
stars within the framework of scalar-tensor tensor theories of gravity, also
takes place in boson stars without including a self-interaction term for the
boson field (other than the mass term), contrary to what was claimed before.
The analy... | [
{
"created": "Wed, 24 Mar 2010 22:32:43 GMT",
"version": "v1"
},
{
"created": "Wed, 19 May 2010 20:17:10 GMT",
"version": "v2"
}
] | 2012-07-30 | [
[
"Alcubierre",
"Miguel",
""
],
[
"Degollado",
"Juan C.",
""
],
[
"Nunez",
"Dario",
""
],
[
"Ruiz",
"Milton",
""
],
[
"Salgado",
"Marcelo",
""
]
] | We show that the phenomenon of spontaneous scalarization predicted in neutron stars within the framework of scalar-tensor tensor theories of gravity, also takes place in boson stars without including a self-interaction term for the boson field (other than the mass term), contrary to what was claimed before. The analysi... |
gr-qc/9907075 | Luis A. Nunez | G. Contreras, L.A. N\'u\~nez, and U. Percoco | Ricci Collineations for Non-Degenerate, Diagonal and Spherically
Symmetric Ricci Tensors | null | Gen.Rel.Grav. 32 (2000) 285-294 | 10.1023/A:1001983426767 | null | gr-qc | null | The expression of the vector field generator of a Ricci Collineation for
diagonal, spherically symmetric and non-degenerate Ricci tensors is obtained.
The resulting expressions show that the time and radial first derivatives of
the components of the Ricci tensor can be used to classify the collineation,
leading to 64... | [
{
"created": "Fri, 23 Jul 1999 16:52:56 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Contreras",
"G.",
""
],
[
"Núñez",
"L. A.",
""
],
[
"Percoco",
"U.",
""
]
] | The expression of the vector field generator of a Ricci Collineation for diagonal, spherically symmetric and non-degenerate Ricci tensors is obtained. The resulting expressions show that the time and radial first derivatives of the components of the Ricci tensor can be used to classify the collineation, leading to 64 f... |
2106.13607 | Gamal G.L. Nashed | G.G.L. Nashed, S.D. Odintsov and V.K. Oikonomou | Anisotropic compact stars in higher-order curvature theory | 16 pages, 12 figures, 3 tables | Eur. Phys. J. C (2021) 81:528 | 10.1140/epjc/s10052-021-09321-3 | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In this paper, we shall consider spherically symmetric spacetime solutions
describing the interior of stellar compact objects, in the context of
higher-order curvature theory of the f(R) type. We shall derive the non--vacuum
field equations of the higher-order curvature theory, without assuming any
specific form of t... | [
{
"created": "Fri, 25 Jun 2021 12:58:52 GMT",
"version": "v1"
}
] | 2021-06-28 | [
[
"Nashed",
"G. G. L.",
""
],
[
"Odintsov",
"S. D.",
""
],
[
"Oikonomou",
"V. K.",
""
]
] | In this paper, we shall consider spherically symmetric spacetime solutions describing the interior of stellar compact objects, in the context of higher-order curvature theory of the f(R) type. We shall derive the non--vacuum field equations of the higher-order curvature theory, without assuming any specific form of the... |
1912.04547 | Hideo Iguchi | Tam\'as S. Bir\'o, Viktor G. Czinner, Hideo Iguchi, P\'eter V\'an | Volume dependent extension of Kerr-Newman black hole thermodynamics | 6 pages, 1 figure; accepted for publication in Phys. Lett. B | Phys. Lett. B 803 (2020) 135344 | 10.1016/j.physletb.2020.135344 | null | gr-qc cond-mat.stat-mech hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We show that the Hawking--Bekenstein entropy formula is modified by a factor
of $8/3$ if one also considers a work term in the 1st law of thermodynamics by
a pressure stemming from the Hawking radiation. We give an intuitive definition
for the corresponding thermodynamical volume by the implicit definition
$\epsilon=... | [
{
"created": "Tue, 10 Dec 2019 07:24:58 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Mar 2020 04:38:01 GMT",
"version": "v2"
}
] | 2020-04-22 | [
[
"Biró",
"Tamás S.",
""
],
[
"Czinner",
"Viktor G.",
""
],
[
"Iguchi",
"Hideo",
""
],
[
"Ván",
"Péter",
""
]
] | We show that the Hawking--Bekenstein entropy formula is modified by a factor of $8/3$ if one also considers a work term in the 1st law of thermodynamics by a pressure stemming from the Hawking radiation. We give an intuitive definition for the corresponding thermodynamical volume by the implicit definition $\epsilon=Mc... |
2304.08624 | Kazufumi Takahashi | Kazufumi Takahashi, Masato Minamitsuji, Hayato Motohashi | Effective description of generalized disformal theories | 16 pages | JCAP 07 (2023) 009 | 10.1088/1475-7516/2023/07/009 | YITP-23-46 | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by/4.0/ | Generalized disformal transformations enable us to construct the generalized
disformal Horndeski theories, which form the most general class of ghost-free
scalar-tensor theories to this date. We extend the effective field theory (EFT)
of cosmological perturbations to incorporate these generalized disformal
Horndeski ... | [
{
"created": "Mon, 17 Apr 2023 21:28:47 GMT",
"version": "v1"
},
{
"created": "Tue, 4 Jul 2023 21:51:50 GMT",
"version": "v2"
}
] | 2023-07-06 | [
[
"Takahashi",
"Kazufumi",
""
],
[
"Minamitsuji",
"Masato",
""
],
[
"Motohashi",
"Hayato",
""
]
] | Generalized disformal transformations enable us to construct the generalized disformal Horndeski theories, which form the most general class of ghost-free scalar-tensor theories to this date. We extend the effective field theory (EFT) of cosmological perturbations to incorporate these generalized disformal Horndeski th... |
1405.2215 | Elizabeth Winstanley | Victor E. Ambrus and Elizabeth Winstanley | Dirac fermions on an anti-de Sitter background | 10 pages, 4 figures, submitted to the proceedings of the TIM-13
Physics Conference, 21-24 November 2013, Timisoara, Romania | AIP Conf. Proc. 1634, 40 (2014) | 10.1063/1.4903012 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Using an exact expression for the bi-spinor of parallel transport, we
construct the Feynman propagator for Dirac fermions in the vacuum state on
anti-de Sitter space-time. We compute the vacuum expectation value of the
stress-energy tensor by removing coincidence-limit divergences using the
Hadamard method. We then u... | [
{
"created": "Fri, 9 May 2014 12:25:05 GMT",
"version": "v1"
}
] | 2015-01-05 | [
[
"Ambrus",
"Victor E.",
""
],
[
"Winstanley",
"Elizabeth",
""
]
] | Using an exact expression for the bi-spinor of parallel transport, we construct the Feynman propagator for Dirac fermions in the vacuum state on anti-de Sitter space-time. We compute the vacuum expectation value of the stress-energy tensor by removing coincidence-limit divergences using the Hadamard method. We then use... |
2304.05852 | Diego Rubiera-Garcia | Merce Guerrero, Gonzalo J. Olmo, Diego Rubiera-Garcia | Geodesic completeness of effective null geodesics in regular space-times
with non-linear electrodynamics | 7 pages, 4 figures | Eur.Phys.J.C 83 (2023) 9, 785 | 10.1140/epjc/s10052-023-11969-y | IPARCOS-UCM-23-112 | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We study the completeness of light trajectories in certain spherically
symmetric regular geometries found in Palatini theories of gravity threaded by
non-linear (electromagnetic) fields, which makes their propagation to happen
along geodesics of an effective metric. Two types of geodesic restoration
mechanisms are em... | [
{
"created": "Wed, 12 Apr 2023 13:31:49 GMT",
"version": "v1"
}
] | 2023-09-25 | [
[
"Guerrero",
"Merce",
""
],
[
"Olmo",
"Gonzalo J.",
""
],
[
"Rubiera-Garcia",
"Diego",
""
]
] | We study the completeness of light trajectories in certain spherically symmetric regular geometries found in Palatini theories of gravity threaded by non-linear (electromagnetic) fields, which makes their propagation to happen along geodesics of an effective metric. Two types of geodesic restoration mechanisms are empl... |
2301.06483 | Guangzhou Guo | Guangzhou Guo, Peng Wang, Houwen Wu and Haitang Yang | Superradiance Instabilities of Charged Black Holes in
Einstein-Maxwell-scalar Theory | 24 pages, 7 figures, references added | null | 10.1007/JHEP07(2023)070 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study time evolutions of charged scalar perturbations on the background of
a charged hairy black hole, in which the perturbations can be governed by a
double-peak effective potential. By extracting quasinormal modes from the
waveform of scalar perturbations, we discover that some quasinormal modes,
which are trapp... | [
{
"created": "Mon, 16 Jan 2023 15:41:56 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Feb 2023 08:30:33 GMT",
"version": "v2"
}
] | 2023-07-26 | [
[
"Guo",
"Guangzhou",
""
],
[
"Wang",
"Peng",
""
],
[
"Wu",
"Houwen",
""
],
[
"Yang",
"Haitang",
""
]
] | We study time evolutions of charged scalar perturbations on the background of a charged hairy black hole, in which the perturbations can be governed by a double-peak effective potential. By extracting quasinormal modes from the waveform of scalar perturbations, we discover that some quasinormal modes, which are trapped... |
gr-qc/0211043 | Felix Finster | Felix Finster, Joel Smoller, and Shing-Tung Yau | Non-Existence of Black Hole Solutions to Static, Spherically Symmetric
Einstein-Dirac Systems - a Critical Discussion | 4 pages, 2 figures | null | null | null | gr-qc | null | This short note compares different methods to prove that Einstein-Dirac
systems have no static, spherically symmetric solutions.
| [
{
"created": "Tue, 12 Nov 2002 17:08:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Finster",
"Felix",
""
],
[
"Smoller",
"Joel",
""
],
[
"Yau",
"Shing-Tung",
""
]
] | This short note compares different methods to prove that Einstein-Dirac systems have no static, spherically symmetric solutions. |
1512.06397 | Sebastiano Bernuzzi | Sebastiano Bernuzzi, David Radice, Christian D. Ott, Luke F. Roberts,
Philipp Moesta, Filippo Galeazzi | How loud are neutron star mergers? | 6 pages, 3 figures. Waveforms available at
https://zenodo.org/record/57844 | Phys. Rev. D 94, 024023 (2016) | 10.1103/PhysRevD.94.024023 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present results from the first large parameter study of neutron star
mergers using fully general relativistic simulations with finite-temperature
microphysical equations of state and neutrino cooling. We consider equal and
unequal-mass binaries drawn from the galactic population and simulate each
binary with three... | [
{
"created": "Sun, 20 Dec 2015 16:47:28 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Jul 2016 21:36:49 GMT",
"version": "v2"
}
] | 2016-07-20 | [
[
"Bernuzzi",
"Sebastiano",
""
],
[
"Radice",
"David",
""
],
[
"Ott",
"Christian D.",
""
],
[
"Roberts",
"Luke F.",
""
],
[
"Moesta",
"Philipp",
""
],
[
"Galeazzi",
"Filippo",
""
]
] | We present results from the first large parameter study of neutron star mergers using fully general relativistic simulations with finite-temperature microphysical equations of state and neutrino cooling. We consider equal and unequal-mass binaries drawn from the galactic population and simulate each binary with three d... |
gr-qc/0102020 | Garcia | L.C.Garcia de Andrade | Spin-Polarised Cylinders and Torsion Balances to test Einstein-Cartan
Gravity? | latex file | null | null | null | gr-qc | null | Spin-Polarised cylinders with and without axial magnetic fields are obtained
as particular families of solutions of Einstein-Cartan gravity (EC).The first
solution represents a spin-polarised cylinder in teleparallel gravity.The
second solution is a magnetized solution representing a spin-polarised cylinder
where the... | [
{
"created": "Tue, 6 Feb 2001 04:15:35 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"de Andrade",
"L. C. Garcia",
""
]
] | Spin-Polarised cylinders with and without axial magnetic fields are obtained as particular families of solutions of Einstein-Cartan gravity (EC).The first solution represents a spin-polarised cylinder in teleparallel gravity.The second solution is a magnetized solution representing a spin-polarised cylinder where the m... |
1402.3155 | Francesco Cianfrani dr | Emanuele Alesci, Francesco Cianfrani | Quantum Reduced Loop Gravity: Semiclassical limit | 23 pages | null | 10.1103/PhysRevD.90.024006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the semiclassical limit of Quantum Reduced Loop Gravity, a
recently proposed model to address the quantum dynamics of the early Universe.
We apply the techniques developed in full Loop Quantum Gravity to define the
semiclassical states in the kinematical Hilbert space and evaluating the
expectation value o... | [
{
"created": "Thu, 13 Feb 2014 14:47:43 GMT",
"version": "v1"
}
] | 2015-06-18 | [
[
"Alesci",
"Emanuele",
""
],
[
"Cianfrani",
"Francesco",
""
]
] | We discuss the semiclassical limit of Quantum Reduced Loop Gravity, a recently proposed model to address the quantum dynamics of the early Universe. We apply the techniques developed in full Loop Quantum Gravity to define the semiclassical states in the kinematical Hilbert space and evaluating the expectation value of ... |
1003.1889 | Olivier Minazzoli | Olivier Minazzoli and Bertrand Chauvineau | Explicit form of the Scalar-Tensor metric to be used for propagation of
light in the Solar system in continuity of the GR IAU2000 metric | 10 pages, 1 figure | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The metric recommanded by the IAU2000 resolutions allows propagation of light
calculations at the c-3 level in the general relativity framework. In a recent
paper [1], motivated by forthcoming space experiments involving propagation of
light in the Solar System (ASTROD, GAIA, LATOR, ODYSSEY, SAGAS, SIM, TIPO,
...), w... | [
{
"created": "Tue, 9 Mar 2010 14:54:10 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Mar 2010 07:59:12 GMT",
"version": "v2"
}
] | 2010-03-15 | [
[
"Minazzoli",
"Olivier",
""
],
[
"Chauvineau",
"Bertrand",
""
]
] | The metric recommanded by the IAU2000 resolutions allows propagation of light calculations at the c-3 level in the general relativity framework. In a recent paper [1], motivated by forthcoming space experiments involving propagation of light in the Solar System (ASTROD, GAIA, LATOR, ODYSSEY, SAGAS, SIM, TIPO, ...), we ... |
gr-qc/0307044 | Sergio E. Jor\'as | S.E. Jor\'as and T.J. Stuchi | Chaos in a closed Friedmann-Robertson-Walker universe: An imaginary
approach | 11 pages, 27 figures. Corrected some references and typos | Phys.Rev. D68 (2003) 123525 | 10.1103/PhysRevD.68.123525 | null | gr-qc nlin.CD | null | In this work we study the existence of mechanisms of transition to global
chaos in a closed Friedmann-Robertson-Walker universe with a massive
conformally coupled scalar field. We propose a complexification of the radius
of the universe so that the global dynamics can be understood. We show
numerically the existence ... | [
{
"created": "Wed, 9 Jul 2003 23:36:29 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Feb 2004 23:40:10 GMT",
"version": "v2"
}
] | 2009-11-10 | [
[
"Jorás",
"S. E.",
""
],
[
"Stuchi",
"T. J.",
""
]
] | In this work we study the existence of mechanisms of transition to global chaos in a closed Friedmann-Robertson-Walker universe with a massive conformally coupled scalar field. We propose a complexification of the radius of the universe so that the global dynamics can be understood. We show numerically the existence of... |
1210.7466 | Junichi Iwasaki | Junichi Iwasaki | Time evolution of Hamiltonian constraint system: an idea applicable to
quantum gravity | 10 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hamiltonian constraint system is the canonical formulation of a physical
system with a Hamiltonian constrained to vanish. In terms of the canonical
variables, we define what we call reference observable, with respect to which
other observables evolve. We study if it plays the role of time. As simple
examples, we ... | [
{
"created": "Sun, 28 Oct 2012 14:59:51 GMT",
"version": "v1"
}
] | 2012-10-30 | [
[
"Iwasaki",
"Junichi",
""
]
] | The Hamiltonian constraint system is the canonical formulation of a physical system with a Hamiltonian constrained to vanish. In terms of the canonical variables, we define what we call reference observable, with respect to which other observables evolve. We study if it plays the role of time. As simple examples, we st... |
1511.03785 | Babak Vakili | B. Vakili and M. A. Gorji | Nonsingular universe from generalized thermostatistics | 6 pages, no figures | Int. J. Mod. Phys. D 25 (2016) 1650028 | 10.1142/S0218271816500280 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the statistical mechanics of the early radiation dominated universe
in the context of a generalized uncertainty principle which supports the
existence of a minimal length scale. Utilizing the resultant modified
thermodynamical quantities, we obtain a deformed Friedmann equation which is
very similar to that ... | [
{
"created": "Thu, 12 Nov 2015 05:50:48 GMT",
"version": "v1"
}
] | 2016-01-22 | [
[
"Vakili",
"B.",
""
],
[
"Gorji",
"M. A.",
""
]
] | We study the statistical mechanics of the early radiation dominated universe in the context of a generalized uncertainty principle which supports the existence of a minimal length scale. Utilizing the resultant modified thermodynamical quantities, we obtain a deformed Friedmann equation which is very similar to that ar... |
1111.4356 | Stefano Finazzi | Antonin Coutant, Stefano Finazzi, Stefano Liberati, and Renaud
Parentani | Impossibility of superluminal travel in Lorentz violating theories | 5 pages, 3 figures | Phys. Rev. D 85, 064020 (2012) | 10.1103/PhysRevD.85.064020 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Warp drives are space-times allowing for superluminal travel. However, they
are quantum mechanically unstable because they produce a Hawking-like radiation
which is blue shifted at their front wall without any bound. We reexamine this
instability when local Lorentz invariance is violated at ultrahigh energy by
disper... | [
{
"created": "Fri, 18 Nov 2011 13:28:33 GMT",
"version": "v1"
},
{
"created": "Wed, 11 Apr 2012 10:05:58 GMT",
"version": "v2"
}
] | 2012-04-12 | [
[
"Coutant",
"Antonin",
""
],
[
"Finazzi",
"Stefano",
""
],
[
"Liberati",
"Stefano",
""
],
[
"Parentani",
"Renaud",
""
]
] | Warp drives are space-times allowing for superluminal travel. However, they are quantum mechanically unstable because they produce a Hawking-like radiation which is blue shifted at their front wall without any bound. We reexamine this instability when local Lorentz invariance is violated at ultrahigh energy by dispersi... |
2404.11931 | Shagun Kaushal | Sourav Bhattacharya and Shagun Kaushal | Entanglement generation between two comoving Unruh-DeWitt detectors in
the cosmological de Sitter spacetime | 23 pages, 5 figs | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate the entanglement generation or harvesting between two
identical Unruh-DeWitt detectors in the cosmological de Sitter spacetime. We
consider two comoving two-level detectors at a coincident spatial position. The
detectors are assumed to be unentangled initially. The detectors are
individually coupled to... | [
{
"created": "Thu, 18 Apr 2024 06:20:07 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Apr 2024 17:39:59 GMT",
"version": "v2"
}
] | 2024-04-23 | [
[
"Bhattacharya",
"Sourav",
""
],
[
"Kaushal",
"Shagun",
""
]
] | We investigate the entanglement generation or harvesting between two identical Unruh-DeWitt detectors in the cosmological de Sitter spacetime. We consider two comoving two-level detectors at a coincident spatial position. The detectors are assumed to be unentangled initially. The detectors are individually coupled to a... |
0908.3431 | Valerio Faraoni | Valerio Faraoni (Bishop's University) | Harrison's interpretation of the cosmological redshift revisited | 12 pages, LaTeX, to appear in Gen. Rel. Gravit | null | 10.1007/s10714-009-0885-8 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Harrison's argument against the interpretation of the cosmological redshift
as a Doppler effect is revisited, exaggerated, and discussed. The context,
purpose, and limitations of the interpretations of this phenomenon are
clarified.
| [
{
"created": "Mon, 24 Aug 2009 13:05:12 GMT",
"version": "v1"
}
] | 2015-05-14 | [
[
"Faraoni",
"Valerio",
"",
"Bishop's University"
]
] | Harrison's argument against the interpretation of the cosmological redshift as a Doppler effect is revisited, exaggerated, and discussed. The context, purpose, and limitations of the interpretations of this phenomenon are clarified. |
2208.04218 | Patryk Mach | Adam Cie\'slik, Patryk Mach, Andrzej Odrzywolek | Accretion of the relativistic Vlasov gas in the equatorial plane of the
Kerr black hole | 24 pages, 17 figures | null | 10.1103/PhysRevD.106.104056 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We investigate stationary accretion of the collisionless Vlasov gas onto the
Kerr black hole, occurring in the equatorial plane. The solution is specified
by imposing asymptotic boundary conditions: at infinity the gas obeys the
Maxwell-J\"{u}ttner distribution, restricted to the equatorial plane (both in
positions a... | [
{
"created": "Mon, 8 Aug 2022 15:41:46 GMT",
"version": "v1"
}
] | 2022-12-07 | [
[
"Cieślik",
"Adam",
""
],
[
"Mach",
"Patryk",
""
],
[
"Odrzywolek",
"Andrzej",
""
]
] | We investigate stationary accretion of the collisionless Vlasov gas onto the Kerr black hole, occurring in the equatorial plane. The solution is specified by imposing asymptotic boundary conditions: at infinity the gas obeys the Maxwell-J\"{u}ttner distribution, restricted to the equatorial plane (both in positions and... |
0805.4179 | Raul Vera | Marc Mars, Filipe C. Mena and Ra\"ul Vera | First order perturbations of the Einstein-Straus and Oppenheimer-Snyder
models | LaTeX; 29 pages | Phys.Rev.D78:084022,2008 | 10.1103/PhysRevD.78.084022 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We derive the linearly perturbed matching conditions between a Schwarzschild
spacetime region with stationary and axially symmetric perturbations and a FLRW
spacetime with arbitrary perturbations. The matching hypersurface is also
perturbed arbitrarily and, in all cases, the perturbations are decomposed into
scalars ... | [
{
"created": "Tue, 27 May 2008 19:44:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mars",
"Marc",
""
],
[
"Mena",
"Filipe C.",
""
],
[
"Vera",
"Raül",
""
]
] | We derive the linearly perturbed matching conditions between a Schwarzschild spacetime region with stationary and axially symmetric perturbations and a FLRW spacetime with arbitrary perturbations. The matching hypersurface is also perturbed arbitrarily and, in all cases, the perturbations are decomposed into scalars us... |
1410.3895 | Ravindra Saraykar Dr. | R. V. Saraykar and Sujatha Janardhan | Zeeman-like topologies in Special and General theory of Relativity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is a short review article in which we discuss and summarize the works of
various researchers over past four decades on Zeeman topology and Zeeman-like
topologies, which occur in special and general theory of relativity. We also
discuss various properties and inter-relationship of these topologies.
| [
{
"created": "Tue, 14 Oct 2014 23:45:33 GMT",
"version": "v1"
}
] | 2014-10-16 | [
[
"Saraykar",
"R. V.",
""
],
[
"Janardhan",
"Sujatha",
""
]
] | This is a short review article in which we discuss and summarize the works of various researchers over past four decades on Zeeman topology and Zeeman-like topologies, which occur in special and general theory of relativity. We also discuss various properties and inter-relationship of these topologies. |
0904.1263 | Morteza Mohseni | M. Mortazavimanesh and Morteza Mohseni | Spinning particles in Schwarzschild-de Sitter space-time | 8 pages, 5 eps figures, submitted to Gen.Rel.Grav | Gen.Rel.Grav.41:2697-2706,2009 | 10.1007/s10714-009-0798-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | After considering the reference case of the motion of spinning test bodies in
the equatorial plane of the Schwarzschild space-time, we generalize the results
to the case of the motion of a spinning particle in the equatorial plane of the
Schwarzschild-de Sitter space-time. Specifically, we obtain the loci of turning
... | [
{
"created": "Wed, 8 Apr 2009 05:42:23 GMT",
"version": "v1"
}
] | 2014-11-18 | [
[
"Mortazavimanesh",
"M.",
""
],
[
"Mohseni",
"Morteza",
""
]
] | After considering the reference case of the motion of spinning test bodies in the equatorial plane of the Schwarzschild space-time, we generalize the results to the case of the motion of a spinning particle in the equatorial plane of the Schwarzschild-de Sitter space-time. Specifically, we obtain the loci of turning po... |
1704.00599 | Zachariah Etienne | Zachariah B. Etienne, Mew-Bing Wan, Maria C. Babiuc, Sean T.
McWilliams, Ashok Choudhary | GiRaFFE: An Open-Source General Relativistic Force-Free Electrodynamics
Code | 23 pages, 4 figures. Consistent with published version | Class. Quantum Grav. 34 (2017) 215001 | 10.1088/1361-6382/aa8ab3 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present GiRaFFE, the first open-source general relativistic force-free
electrodynamics (GRFFE) code for dynamical, numerical-relativity generated
spacetimes. GiRaFFE adopts the strategy pioneered by McKinney and modified by
Paschalidis and Shapiro to convert a GR magnetohydrodynamic (GRMHD) code into a
GRFFE code.... | [
{
"created": "Thu, 30 Mar 2017 18:00:00 GMT",
"version": "v1"
},
{
"created": "Sun, 1 Oct 2017 21:44:01 GMT",
"version": "v2"
}
] | 2017-10-25 | [
[
"Etienne",
"Zachariah B.",
""
],
[
"Wan",
"Mew-Bing",
""
],
[
"Babiuc",
"Maria C.",
""
],
[
"McWilliams",
"Sean T.",
""
],
[
"Choudhary",
"Ashok",
""
]
] | We present GiRaFFE, the first open-source general relativistic force-free electrodynamics (GRFFE) code for dynamical, numerical-relativity generated spacetimes. GiRaFFE adopts the strategy pioneered by McKinney and modified by Paschalidis and Shapiro to convert a GR magnetohydrodynamic (GRMHD) code into a GRFFE code. I... |
2306.16168 | Sagarika Tripathy | Sagarika Tripathy, Rathul Nath Raveendran, Krishnamohan Parattu, and
L. Sriramkumar | Amplifying quantum discord during inflationary magnetogenesis through
violation of parity | 24 pages, 5 figures | Phys. Rev. D 108, 123512 (2023) | 10.1103/PhysRevD.108.123512 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is well known that, during inflation, the conformal invariance of the
electromagnetic action has to be broken in order to produce magnetic fields of
observed strengths today. Often, to further enhance the strengths of the
magnetic fields, parity is also assumed to be violated when the fields are
being generated. I... | [
{
"created": "Wed, 28 Jun 2023 12:44:57 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Nov 2023 09:54:58 GMT",
"version": "v2"
}
] | 2023-12-19 | [
[
"Tripathy",
"Sagarika",
""
],
[
"Raveendran",
"Rathul Nath",
""
],
[
"Parattu",
"Krishnamohan",
""
],
[
"Sriramkumar",
"L.",
""
]
] | It is well known that, during inflation, the conformal invariance of the electromagnetic action has to be broken in order to produce magnetic fields of observed strengths today. Often, to further enhance the strengths of the magnetic fields, parity is also assumed to be violated when the fields are being generated. In ... |
0904.0219 | Lorenzo Iorio | Lorenzo Iorio | Galactic orbital motions in the Dark Matter, MOdified Newtonian Dynamics
and MOdified Gravity scenarios | LaTex2e, 11 pages, 2 tables, 8 figures. Issues concerning the masses
of MCs clarified. Integration time changed to -1 Gyr <= t <= +1 Gyr. To
appear in Monthly Notices of the Royal Astronomical Society (MNRAS) | Mon.Not.Roy.Astron.Soc.401:2012-2020,2010 | 10.1111/j.1365-2966.2009.15811.x | null | gr-qc astro-ph.GA | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We simultaneously integrate in a numerical way the equations of motion of
both the Magellanic Clouds (MCs) in MOND, MOG and CDM for -1 <= t <= +1 Gyr to
see if, at least in principle, it is possible to discriminate between them
(Abridged version).
| [
{
"created": "Wed, 1 Apr 2009 17:03:26 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Aug 2009 11:44:24 GMT",
"version": "v2"
},
{
"created": "Wed, 16 Sep 2009 08:04:40 GMT",
"version": "v3"
},
{
"created": "Thu, 1 Oct 2009 15:45:54 GMT",
"version": "v4"
}
] | 2010-01-12 | [
[
"Iorio",
"Lorenzo",
""
]
] | We simultaneously integrate in a numerical way the equations of motion of both the Magellanic Clouds (MCs) in MOND, MOG and CDM for -1 <= t <= +1 Gyr to see if, at least in principle, it is possible to discriminate between them (Abridged version). |
1907.04341 | Jeffrey Hazboun | Jeffrey S. Hazboun and Joseph D. Romano and Tristan L. Smith | Realistic sensitivity curves for pulsar timing arrays | 21 pages, 18 figues | Phys. Rev. D 100, 104028 (2019) | 10.1103/PhysRevD.100.104028 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct realistic sensitivity curves for pulsar timing array searches
for gravitational waves, incorporating both red and white noise contributions
to individual pulsar noise spectra, as well as the effect of fitting to a
pulsar timing model. We demonstrate the method on both simulated pulsars and a
realistic ar... | [
{
"created": "Tue, 9 Jul 2019 18:01:12 GMT",
"version": "v1"
}
] | 2019-11-20 | [
[
"Hazboun",
"Jeffrey S.",
""
],
[
"Romano",
"Joseph D.",
""
],
[
"Smith",
"Tristan L.",
""
]
] | We construct realistic sensitivity curves for pulsar timing array searches for gravitational waves, incorporating both red and white noise contributions to individual pulsar noise spectra, as well as the effect of fitting to a pulsar timing model. We demonstrate the method on both simulated pulsars and a realistic arra... |
1408.4592 | Andrea Geralico | Donato Bini, Fernando de Felice, Andrea Geralico | Strains and axial outflows in the field of a rotating black hole | 8 pages, 1 figure; published version | Phys. Rev. D 76, 047502 (2007) | 10.1103/PhysRevD.76.047502 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the behaviour of an initially spherical bunch of accelerated
particles emitted along trajectories parallel to the symmetry axis of a
rotating black hole. We find that, under suitable conditions, curvature and
inertial strains compete to model the shape of axial outflows of matter
contributing to generate jet... | [
{
"created": "Wed, 20 Aug 2014 10:18:31 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Bini",
"Donato",
""
],
[
"de Felice",
"Fernando",
""
],
[
"Geralico",
"Andrea",
""
]
] | We study the behaviour of an initially spherical bunch of accelerated particles emitted along trajectories parallel to the symmetry axis of a rotating black hole. We find that, under suitable conditions, curvature and inertial strains compete to model the shape of axial outflows of matter contributing to generate jet-l... |
0807.0060 | David Hestenes | David Hestenes | Gauge Gravity and Electroweak Theory | 19 pages, no figures, from the Eleventh Marcel Grossmann Meeting on
General Relativity | null | 10.1142/9789812834300_0026 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Reformulation of the Dirac equation in terms of the real Spacetime Algebra
(STA) reveals hidden geometric structure, including a geometric role for the
unit imaginary as generator of rotations in a spacelike plane. The STA and the
real Dirac equation play essential roles in a new Gauge Theory Gravity (GTG)
version of... | [
{
"created": "Tue, 1 Jul 2008 03:45:40 GMT",
"version": "v1"
}
] | 2016-11-15 | [
[
"Hestenes",
"David",
""
]
] | Reformulation of the Dirac equation in terms of the real Spacetime Algebra (STA) reveals hidden geometric structure, including a geometric role for the unit imaginary as generator of rotations in a spacelike plane. The STA and the real Dirac equation play essential roles in a new Gauge Theory Gravity (GTG) version of G... |
gr-qc/0002087 | Alexei Zakharov | A. V. Zakharov | Macroscopic Einstein equations for a system of interacting particles and
their cosmological applications | 10 pages LATEX 2.09 | null | null | KSU-GRG-00-az02 | gr-qc | null | One of the possible applications of macroscopic Einstein equations has been
considered. So, the nonsingular isotropic and uniform cosmological model is
built. The cosmological consequences of this model are agree with conclusions
of standard hot model of the Universe.
| [
{
"created": "Fri, 25 Feb 2000 07:16:40 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zakharov",
"A. V.",
""
]
] | One of the possible applications of macroscopic Einstein equations has been considered. So, the nonsingular isotropic and uniform cosmological model is built. The cosmological consequences of this model are agree with conclusions of standard hot model of the Universe. |
gr-qc/0605002 | Patrick Sutton | Shourov Chatterji, Albert Lazzarini, Leo Stein, Patrick Sutton, Antony
Searle, Massimo Tinto | Coherent network analysis technique for discriminating
gravitational-wave bursts from instrumental noise | 18 pages, 11 figures; corrected corrupted figure | Phys.Rev.D74:082005,2006 | 10.1103/PhysRevD.74.082005 | LIGO-P060009-01-E | gr-qc | null | Existing coherent network analysis techniques for detecting
gravitational-wave bursts simultaneously test data from multiple observatories
for consistency with the expected properties of the signals. These techniques
assume the output of the detector network to be the sum of a stationary
Gaussian noise process and a ... | [
{
"created": "Sat, 29 Apr 2006 03:54:04 GMT",
"version": "v1"
},
{
"created": "Mon, 1 May 2006 21:08:52 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Chatterji",
"Shourov",
""
],
[
"Lazzarini",
"Albert",
""
],
[
"Stein",
"Leo",
""
],
[
"Sutton",
"Patrick",
""
],
[
"Searle",
"Antony",
""
],
[
"Tinto",
"Massimo",
""
]
] | Existing coherent network analysis techniques for detecting gravitational-wave bursts simultaneously test data from multiple observatories for consistency with the expected properties of the signals. These techniques assume the output of the detector network to be the sum of a stationary Gaussian noise process and a gr... |
1101.2084 | Daniele Malafarina | Pankaj S. Joshi and Daniele Malafarina | Instability of black hole formation in gravitational collapse | 5 pages | Phys.Rev.D83:024009,2011 | 10.1103/PhysRevD.83.024009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider here the classic scenario given by Oppenheimer, Snyder, and Datt,
for the gravitational collapse of a massive matter cloud, and examine its
stability under the introduction of small tangential stresses. We show, by
offering an explicit class of physically valid tangential stress perturbations,
that an int... | [
{
"created": "Tue, 11 Jan 2011 10:17:33 GMT",
"version": "v1"
}
] | 2011-02-02 | [
[
"Joshi",
"Pankaj S.",
""
],
[
"Malafarina",
"Daniele",
""
]
] | We consider here the classic scenario given by Oppenheimer, Snyder, and Datt, for the gravitational collapse of a massive matter cloud, and examine its stability under the introduction of small tangential stresses. We show, by offering an explicit class of physically valid tangential stress perturbations, that an intro... |
1701.06724 | Miguel Cruz | Miguel Cruz, Norman Cruz and Samuel Lepe | Phantom solution in a non-linear Israel-Stewart theory | 18 pages and 6 figures. Published version in PLB | Phys. Lett. B 769, 159 (2017) | 10.1016/j.physletb.2017.03.065 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we present a phantom solution with a big rip singularity in a
non-linear regime of the Israel-Stewart formalism. In this framework it is
possible to extend this causal formalism in order to describe accelerated
expansion, where assumption of near equilibrium is no longer valid. We assume a
flat universe... | [
{
"created": "Tue, 24 Jan 2017 03:57:20 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Apr 2017 16:04:08 GMT",
"version": "v2"
}
] | 2017-04-06 | [
[
"Cruz",
"Miguel",
""
],
[
"Cruz",
"Norman",
""
],
[
"Lepe",
"Samuel",
""
]
] | In this paper we present a phantom solution with a big rip singularity in a non-linear regime of the Israel-Stewart formalism. In this framework it is possible to extend this causal formalism in order to describe accelerated expansion, where assumption of near equilibrium is no longer valid. We assume a flat universe f... |
0810.0671 | Mayeul Arminjon | Mayeul Arminjon and Frank Reifler | Quantum mechanics for three versions of the Dirac equation in a curved
spacetime | 8 pages in standard LaTeX. Text of a talk given at the 11th Conf.
"Physical Interpretations of Relativity Theory", London, 12-15 Sept. 2008 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a recent work on the Dirac equation in a curved spacetime. In
addition to the standard equation, two alternative versions are considered,
derived from wave mechanics, and based on the tensor representation of the
Dirac field. The latter considers the Dirac wave function as a spacetime vector
and the set of... | [
{
"created": "Fri, 3 Oct 2008 15:49:05 GMT",
"version": "v1"
}
] | 2008-10-06 | [
[
"Arminjon",
"Mayeul",
""
],
[
"Reifler",
"Frank",
""
]
] | We present a recent work on the Dirac equation in a curved spacetime. In addition to the standard equation, two alternative versions are considered, derived from wave mechanics, and based on the tensor representation of the Dirac field. The latter considers the Dirac wave function as a spacetime vector and the set of t... |
1010.0672 | Suresh Kumar | Suresh Kumar | Some FRW Models of Accelerating Universe with Dark Energy | 10 pages, 5 figures | Astrophysics & Space Science 332 (2011) 449-454 | 10.1007/s10509-010-0540-6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The paper deals with a spatially homogeneous and isotropic FRW space-time
filled with perfect fluid and dark energy components. The two sources are
assumed to interact minimally, and therefore their energy momentum tensors are
conserved separately. A special law of variation for the Hubble parameter
proposed by Berma... | [
{
"created": "Fri, 1 Oct 2010 03:42:20 GMT",
"version": "v1"
}
] | 2014-08-21 | [
[
"Kumar",
"Suresh",
""
]
] | The paper deals with a spatially homogeneous and isotropic FRW space-time filled with perfect fluid and dark energy components. The two sources are assumed to interact minimally, and therefore their energy momentum tensors are conserved separately. A special law of variation for the Hubble parameter proposed by Berman ... |
0710.0428 | Francisco Lobo | Francisco S. N. Lobo | Nature of time and causality in Physics | 14 pages, 11 figures. Book chapter to appear in 'Psychology of Time',
Elsevier Publishers, editor Simon Grondin. V2: comments, one figure and a
reference added; typos corrected | Psychology of Time, 395-422, (2008) | null | null | gr-qc | null | The conceptual definition and understanding of the nature of time, both
qualitatively and quantitatively is of the utmost difficulty and importance,
and plays a fundamental role in physics. Physical systems seem to evolve in
paths of increasing entropy and of complexity, and thus, the arrow of time
shall be explored ... | [
{
"created": "Tue, 2 Oct 2007 02:46:57 GMT",
"version": "v1"
},
{
"created": "Thu, 14 Feb 2008 14:40:15 GMT",
"version": "v2"
}
] | 2015-01-14 | [
[
"Lobo",
"Francisco S. N.",
""
]
] | The conceptual definition and understanding of the nature of time, both qualitatively and quantitatively is of the utmost difficulty and importance, and plays a fundamental role in physics. Physical systems seem to evolve in paths of increasing entropy and of complexity, and thus, the arrow of time shall be explored in... |
2401.04179 | Leonhard Kehrberger | Leonhard Kehrberger, Hamed Masaood | The Case Against Smooth Null Infinity V: Early-Time Asymptotics of
Linearised Gravity Around Schwarzschild for Fixed Spherical Harmonic Modes | 170 pages, 9 figures, arXiv abstract differs from the paper's
abstract. Comments and questions welcome! v2: Fixed a few typos | null | null | null | gr-qc math-ph math.AP math.MP | http://creativecommons.org/licenses/by-sa/4.0/ | Starting from Post-Newtonian predictions for a system of $N$ infalling masses
from the infinite past, we formulate and solve a scattering problem for the
system of linearised gravity around Schwarzschild as introduced in [DHR19]. The
scattering data are posed on a null hypersurface $\mathcal C$ emanating from a
secti... | [
{
"created": "Mon, 8 Jan 2024 19:00:11 GMT",
"version": "v1"
},
{
"created": "Tue, 30 Apr 2024 07:26:35 GMT",
"version": "v2"
}
] | 2024-05-01 | [
[
"Kehrberger",
"Leonhard",
""
],
[
"Masaood",
"Hamed",
""
]
] | Starting from Post-Newtonian predictions for a system of $N$ infalling masses from the infinite past, we formulate and solve a scattering problem for the system of linearised gravity around Schwarzschild as introduced in [DHR19]. The scattering data are posed on a null hypersurface $\mathcal C$ emanating from a section... |
0909.0912 | Antonio F. Ranada | Antonio F. Ranada and Alfredo Tiemblo | On the compatibility of a proposed explanation of the Pioneer anomaly
with the cartography of the solar system | 8 pages, no figures, corrected typos | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We analyze here the reasons why an explanation of the Pioneer anomaly
proposed by the authors is fully compatible with the cartography of the solar
system. First, this proposal posits that the phenomenon is an apparent
acceleration, not a real one, caused by a progressive desynchronization of the
astronomical and the... | [
{
"created": "Fri, 4 Sep 2009 16:10:08 GMT",
"version": "v1"
}
] | 2009-09-07 | [
[
"Ranada",
"Antonio F.",
""
],
[
"Tiemblo",
"Alfredo",
""
]
] | We analyze here the reasons why an explanation of the Pioneer anomaly proposed by the authors is fully compatible with the cartography of the solar system. First, this proposal posits that the phenomenon is an apparent acceleration, not a real one, caused by a progressive desynchronization of the astronomical and the a... |
0811.0138 | Ilya Mandel | Ilya Mandel, Jonathan R. Gair | Can we Detect Intermediate Mass Ratio Inspirals? | Updated to match published version | Class.Quant.Grav.26:094036,2009 | 10.1088/0264-9381/26/9/094036 | null | gr-qc astro-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Gravitational waves emitted during intermediate-mass-ratio inspirals (IMRIs)
of intermediate-mass black holes (IMBHs) into supermassive black holes could
represent a very interesting source for LISA. Similarly, IMRIs of stellar-mass
compact objects into IMBHs could be detectable by Advanced LIGO. At present,
however,... | [
{
"created": "Sun, 2 Nov 2008 07:51:19 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Feb 2009 13:30:00 GMT",
"version": "v2"
},
{
"created": "Mon, 20 Apr 2009 16:06:40 GMT",
"version": "v3"
}
] | 2009-11-13 | [
[
"Mandel",
"Ilya",
""
],
[
"Gair",
"Jonathan R.",
""
]
] | Gravitational waves emitted during intermediate-mass-ratio inspirals (IMRIs) of intermediate-mass black holes (IMBHs) into supermassive black holes could represent a very interesting source for LISA. Similarly, IMRIs of stellar-mass compact objects into IMBHs could be detectable by Advanced LIGO. At present, however, i... |
1907.01561 | Vitor Cardoso | Vitor Cardoso, Adrian del Rio, Masashi Kimura | Distinguishing black holes from horizonless objects through the
excitation of resonances during inspiral | 3+11 pages. v4: corrects one typo (in Eq. A39 and in Eq. 3 for the
scalar flux formula) in the published version | Phys. Rev. D 100, 084046 (2019) | 10.1103/PhysRevD.100.084046 | null | gr-qc astro-ph.HE hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | How well is the vacuum Kerr geometry a good description of the dark, compact
objects in our universe? Precision measurements of accreting matter in the deep
infrared and gravitational-wave measurements of coalescing objects are finally
providing answers to this question. Here, we study the possibility of resonant
exc... | [
{
"created": "Tue, 2 Jul 2019 18:00:05 GMT",
"version": "v1"
},
{
"created": "Sat, 6 Jul 2019 07:53:43 GMT",
"version": "v2"
},
{
"created": "Wed, 9 Oct 2019 18:33:51 GMT",
"version": "v3"
},
{
"created": "Mon, 9 Mar 2020 00:11:03 GMT",
"version": "v4"
}
] | 2020-03-10 | [
[
"Cardoso",
"Vitor",
""
],
[
"del Rio",
"Adrian",
""
],
[
"Kimura",
"Masashi",
""
]
] | How well is the vacuum Kerr geometry a good description of the dark, compact objects in our universe? Precision measurements of accreting matter in the deep infrared and gravitational-wave measurements of coalescing objects are finally providing answers to this question. Here, we study the possibility of resonant excit... |
gr-qc/0205025 | Sawa Manoff | Sawa Manoff | Lagrangian fluid mechanics | 10 pages LaTeX | Published in: "Perspectives in Complex Analysis, Differential
Geometry and Mathematical Physics". World Scientific, Singapore, 2001,
190-200 | null | null | gr-qc | null | The method of Lagrangians with covariant derivative (MLCD) is applied to a
special type of Lagrangian density depending on scalar and vector fields as
well as on their first covariant derivatives. The corresponding
Euler-Lagrange's equations and energy-momentum tensors are found on the basis
of the covariant Noether'... | [
{
"created": "Tue, 7 May 2002 11:09:27 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Manoff",
"Sawa",
""
]
] | The method of Lagrangians with covariant derivative (MLCD) is applied to a special type of Lagrangian density depending on scalar and vector fields as well as on their first covariant derivatives. The corresponding Euler-Lagrange's equations and energy-momentum tensors are found on the basis of the covariant Noether's ... |
gr-qc/9902028 | Andrey Neronov | V. A. Berezin, A. M. Boyarsky, A. Yu. Neronov | On the spectrum of relativistic Schroedinger equation in finite
differences | 16 pages, 1 figure | null | null | INR 0115/99 | gr-qc | null | We develop a method for constructing asymptotic solutions of
finite-difference equations and implement it to a relativistic Schroedinger
equation which describes motion of a selfgravitating spherically symmetric dust
shell. Exact mass spectrum of black hole formed due to the collapse of the
shell is determined from t... | [
{
"created": "Wed, 10 Feb 1999 21:08:09 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Feb 1999 15:09:29 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Berezin",
"V. A.",
""
],
[
"Boyarsky",
"A. M.",
""
],
[
"Neronov",
"A. Yu.",
""
]
] | We develop a method for constructing asymptotic solutions of finite-difference equations and implement it to a relativistic Schroedinger equation which describes motion of a selfgravitating spherically symmetric dust shell. Exact mass spectrum of black hole formed due to the collapse of the shell is determined from the... |
gr-qc/0605095 | Farook Rahaman | F.Rahaman, M. Kalam and A. Ghosh | Existence of Wormholes in Einstein-Kalb-Ramond space time | 5 pages, to appear in Nuovo Cimento B | Nuovo Cim.B121:303-307,2006 | 10.1393/ncb/i2006-10026-9 | null | gr-qc | null | In recent, Kar.S et.al [ Phys Rev D 67,044005 (2003) ] have obtained static
spherically symmetric solutions of the Einstein-Kalb-Ramond field equations. We
have shown that their solutions, indeed, represent Wormholes.
| [
{
"created": "Wed, 17 May 2006 07:08:05 GMT",
"version": "v1"
}
] | 2010-11-11 | [
[
"Rahaman",
"F.",
""
],
[
"Kalam",
"M.",
""
],
[
"Ghosh",
"A.",
""
]
] | In recent, Kar.S et.al [ Phys Rev D 67,044005 (2003) ] have obtained static spherically symmetric solutions of the Einstein-Kalb-Ramond field equations. We have shown that their solutions, indeed, represent Wormholes. |
1907.00955 | Maciej Kolanowski | Maciej Kolanowski, Jerzy Lewandowski and Adam Szereszewski | Extremal horizons stationary to the second order: new constraints | 20 pages, a typo in Eq. (22) corrected | Phys. Rev. D 100, 104057 (2019) | 10.1103/PhysRevD.100.104057 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider non-expanding shear free (NE-SF) null surface geometries
embeddable as extremal Killing horizons to the second order in Einstein vacuum
spacetimes. A NE-SF null surface geometry consists of a degenerate metric
tensor and a consistent torsion free covariant derivative. We derive the
constraints implied by ... | [
{
"created": "Mon, 1 Jul 2019 17:49:09 GMT",
"version": "v1"
},
{
"created": "Tue, 18 Jan 2022 22:35:35 GMT",
"version": "v2"
}
] | 2022-01-20 | [
[
"Kolanowski",
"Maciej",
""
],
[
"Lewandowski",
"Jerzy",
""
],
[
"Szereszewski",
"Adam",
""
]
] | We consider non-expanding shear free (NE-SF) null surface geometries embeddable as extremal Killing horizons to the second order in Einstein vacuum spacetimes. A NE-SF null surface geometry consists of a degenerate metric tensor and a consistent torsion free covariant derivative. We derive the constraints implied by th... |
gr-qc/0511011 | Ingemar Eriksson | Ingemar Eriksson | Conserved Matter Superenergy Currents for Hypersurface Orthogonal
Killing Vectors | 13 pages | Class.Quant.Grav. 23 (2006) 2279-2290 | 10.1088/0264-9381/23/7/005 | null | gr-qc | null | We show that for hypersurface orthogonal Killing vectors, the corresponding
Chevreton superenergy currents will be conserved and proportional to the
Killing vectors. This holds for four-dimensional Einstein-Maxwell spacetimes
with an electromagnetic field that is sourcefree and inherits the symmetry of
the spacetime.... | [
{
"created": "Wed, 2 Nov 2005 15:29:34 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Eriksson",
"Ingemar",
""
]
] | We show that for hypersurface orthogonal Killing vectors, the corresponding Chevreton superenergy currents will be conserved and proportional to the Killing vectors. This holds for four-dimensional Einstein-Maxwell spacetimes with an electromagnetic field that is sourcefree and inherits the symmetry of the spacetime. A... |
1010.2086 | Christian Corda cordac | Christian Corda | Gravitational wave astronomy: the definitive test for the "Einstein
frame versus Jordan frame" controversy | Corrected latest typos. This definitive version matches the version
to be published in Astroparticle Physics 34 (2011) 412-419, 22 pages | Astropart.Phys.34:412-419,2011 | 10.1016/j.astropartphys.2010.10.006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The potential realization of a gravitational wave (GW) astronomy in next
years is a great challenge for the scientific community. By giving a
significant amount of new information, GWs will be a cornerstone for a better
understanding of the universe and of the gravitational physics. In this paper
the author shows tha... | [
{
"created": "Mon, 11 Oct 2010 12:37:52 GMT",
"version": "v1"
},
{
"created": "Tue, 16 Nov 2010 15:29:12 GMT",
"version": "v2"
},
{
"created": "Mon, 29 Nov 2010 08:35:46 GMT",
"version": "v3"
},
{
"created": "Tue, 21 Dec 2010 10:05:08 GMT",
"version": "v4"
}
] | 2011-02-01 | [
[
"Corda",
"Christian",
""
]
] | The potential realization of a gravitational wave (GW) astronomy in next years is a great challenge for the scientific community. By giving a significant amount of new information, GWs will be a cornerstone for a better understanding of the universe and of the gravitational physics. In this paper the author shows that ... |
gr-qc/0203084 | Irina Radinschi | I. Radinschi (Department of Physics, ``Gh. Asachi'' Technical
University, Iasi, Romania) | M{\o}ller Energy-Momentum Complex for an Axially Symmetric Scalar Field | LaTex | null | null | null | gr-qc | null | We calculate the energy-distribution for an axially symmetric scalar field in
the M{\o}ller prescription. The total energy is given by the parameter m of the
space-time.
| [
{
"created": "Mon, 25 Mar 2002 09:56:26 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Radinschi",
"I.",
"",
"Department of Physics, ``Gh. Asachi'' Technical\n University, Iasi, Romania"
]
] | We calculate the energy-distribution for an axially symmetric scalar field in the M{\o}ller prescription. The total energy is given by the parameter m of the space-time. |
1101.5061 | Etera R. Livine | Etera R. Livine | A Short and Subjective Introduction to the Spinfoam Framework for
Quantum Gravity | 90 pages | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This is my Th\`ese d'Habilitation (HDR) on the topic of spinfoam models for
quantum gravity, which I presented in l'Ecole Normale Sup\'erieure de Lyon on
december 16 2010. The spinfoam framework is a proposal for a regularized path
integral for quantum gravity, inspired from Topological Quantum Field Theory
(TQFT) an... | [
{
"created": "Wed, 26 Jan 2011 13:51:14 GMT",
"version": "v1"
}
] | 2015-03-18 | [
[
"Livine",
"Etera R.",
""
]
] | This is my Th\`ese d'Habilitation (HDR) on the topic of spinfoam models for quantum gravity, which I presented in l'Ecole Normale Sup\'erieure de Lyon on december 16 2010. The spinfoam framework is a proposal for a regularized path integral for quantum gravity, inspired from Topological Quantum Field Theory (TQFT) and ... |
0708.1811 | Raymond Burston | R. B. Burston and A. W. C. Lun | 1+1+2 Electromagnetic perturbations on general LRS space-times:
Regge-Wheeler and Bardeen-Press equations | null | Class.Quant.Grav.25:075003,2008 | 10.1088/0264-9381/25/7/075003 | null | gr-qc | null | We use the, covariant and gauge-invariant, 1+1+2 formalism developed by
Clarkson and Barrett, and develop new techniques, to decouple electromagnetic
(EM) perturbations on arbitrary locally rotationally symmetric (LRS)
space-times. Ultimately, we derive 3 decoupled complex equations governing 3
complex scalars. One o... | [
{
"created": "Tue, 14 Aug 2007 09:44:42 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Burston",
"R. B.",
""
],
[
"Lun",
"A. W. C.",
""
]
] | We use the, covariant and gauge-invariant, 1+1+2 formalism developed by Clarkson and Barrett, and develop new techniques, to decouple electromagnetic (EM) perturbations on arbitrary locally rotationally symmetric (LRS) space-times. Ultimately, we derive 3 decoupled complex equations governing 3 complex scalars. One of ... |
gr-qc/0209042 | Christodoulakis Theodosios | T. Christodoulakis, G.O. Papadopoulos, A. Dimakis | Automorphisms of Real 4 Dimensional Lie Algebras and the Invariant
Characterization of Homogeneous 4-Spaces | LaTeX2e, 23 pages, 2 Tables. To appear in Journal of Physics A:
Mathematical & General | J.Phys.A36:427-442,2003 | 10.1088/0305-4470/36/2/310 | null | gr-qc math-ph math.MP | null | The automorphisms of all 4-dimensional, real Lie Algebras are presented in a
comprehensive way. Their action on the space of $4\times 4$, real, symmetric
and positive definite, matrices, defines equivalence classes which are used for
the invariant characterization of the 4-dimensional homogeneous spaces which
possess... | [
{
"created": "Thu, 12 Sep 2002 09:47:37 GMT",
"version": "v1"
},
{
"created": "Wed, 13 Nov 2002 12:05:55 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Christodoulakis",
"T.",
""
],
[
"Papadopoulos",
"G. O.",
""
],
[
"Dimakis",
"A.",
""
]
] | The automorphisms of all 4-dimensional, real Lie Algebras are presented in a comprehensive way. Their action on the space of $4\times 4$, real, symmetric and positive definite, matrices, defines equivalence classes which are used for the invariant characterization of the 4-dimensional homogeneous spaces which possess a... |
2211.01103 | Hugo Roussille | Hugo Roussille | Black hole perturbations in modified gravity theories | PhD thesis (defended 17/06/2022, Universit\'e Paris Cit\'e), 267
pages, 17 figures, 1 appendix, short introduction in French. Based on
arXiv:2012.10218, arXiv:2103.14744, arXiv:2103.14750, arXiv:2204.04107,
arXiv:2205.07746 | null | null | null | gr-qc astro-ph.CO hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The recent first detection of gravitational waves (GWs) from binary black
hole mergers has spurred a renewed interest in possible deviations from General
Relativity (GR), since they could be detected in the GWs emitted by such
systems. Of particular interest is the ringdown phase of a binary black hole
merger, which ... | [
{
"created": "Wed, 2 Nov 2022 13:25:22 GMT",
"version": "v1"
}
] | 2022-11-03 | [
[
"Roussille",
"Hugo",
""
]
] | The recent first detection of gravitational waves (GWs) from binary black hole mergers has spurred a renewed interest in possible deviations from General Relativity (GR), since they could be detected in the GWs emitted by such systems. Of particular interest is the ringdown phase of a binary black hole merger, which ca... |
1912.03868 | Cosimo Bambi | Ashutosh Tripathi, Biao Zhou, Askar B. Abdikamalov, Dimitry Ayzenberg,
Cosimo Bambi | Search for traversable wormholes in active galactic nuclei using X-ray
data | 10 pages, 7 figures. v2: refereed version | Phys. Rev. D 101, 064030 (2020) | 10.1103/PhysRevD.101.064030 | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a previous paper, one of us calculated iron K$\alpha$ line profiles
emitted from possible accretion disks around traversable wormholes as a first
step to use X-ray reflection spectroscopy to search for astrophysical wormholes
in active galactic nuclei. In the present paper, we extend that work and
construct an XSP... | [
{
"created": "Mon, 9 Dec 2019 06:16:52 GMT",
"version": "v1"
},
{
"created": "Mon, 16 Mar 2020 16:28:33 GMT",
"version": "v2"
}
] | 2020-03-17 | [
[
"Tripathi",
"Ashutosh",
""
],
[
"Zhou",
"Biao",
""
],
[
"Abdikamalov",
"Askar B.",
""
],
[
"Ayzenberg",
"Dimitry",
""
],
[
"Bambi",
"Cosimo",
""
]
] | In a previous paper, one of us calculated iron K$\alpha$ line profiles emitted from possible accretion disks around traversable wormholes as a first step to use X-ray reflection spectroscopy to search for astrophysical wormholes in active galactic nuclei. In the present paper, we extend that work and construct an XSPEC... |
2111.07352 | Yu-Xiao Liu | Yu-Qi Dong, Yu-Xiao Liu | Polarization Modes of Gravitational Waves in Palatini Horndeski theory | 23 pages, 1 figure, 1 table | Phys.Rev.D 105 (2022) 6, 064035 | 10.1103/PhysRevD.105.064035 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper, the polarization modes of gravitational waves in Horndeski
gravity are studied under the Palatini formalism. After obtaining the
linearized equation of perturbations in Minkowski background, we find that the
polarization modes of gravitational waves depend on the selection of the
theoretical parameters... | [
{
"created": "Sun, 14 Nov 2021 14:12:50 GMT",
"version": "v1"
},
{
"created": "Sat, 20 Nov 2021 15:11:25 GMT",
"version": "v2"
},
{
"created": "Wed, 23 Mar 2022 09:21:32 GMT",
"version": "v3"
}
] | 2022-03-24 | [
[
"Dong",
"Yu-Qi",
""
],
[
"Liu",
"Yu-Xiao",
""
]
] | In this paper, the polarization modes of gravitational waves in Horndeski gravity are studied under the Palatini formalism. After obtaining the linearized equation of perturbations in Minkowski background, we find that the polarization modes of gravitational waves depend on the selection of the theoretical parameters. ... |
1511.04284 | Pierre Teyssandier | Bernard Linet and Pierre Teyssandier | Time transfer functions in Schwarzschild-like metrics in the weak-field
limit: A unified description of Shapiro and lensing effects | 12 pages, added one figure in section 3; a paragraph in Introduction
rewritten without changing the argument; corrected typos; one reference added
for section 2; Eq. (84) rewritten in a more elegant form; slightly revised
argument in section 9, results unchanged | Phys. Rev. D 93, 044028 (2016) | 10.1103/PhysRevD.93.044028 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a complete analysis of the light rays within the linearized,
weak-field approximation of a Schwarzschild-like metric describing the
gravitational field of an isolated, spherically symmetric body. We prove in
this context the existence of two time transfer functions and we obtain these
functions in an exact... | [
{
"created": "Fri, 13 Nov 2015 14:11:31 GMT",
"version": "v1"
},
{
"created": "Wed, 10 Feb 2016 15:29:56 GMT",
"version": "v2"
}
] | 2016-02-17 | [
[
"Linet",
"Bernard",
""
],
[
"Teyssandier",
"Pierre",
""
]
] | We present a complete analysis of the light rays within the linearized, weak-field approximation of a Schwarzschild-like metric describing the gravitational field of an isolated, spherically symmetric body. We prove in this context the existence of two time transfer functions and we obtain these functions in an exact c... |
0810.3542 | Felipe Falciano | F. T. Falciano, N. Pinto-Neto | Scalar Perturbations in Scalar Field Quantum Cosmology | 10 pages, 2 figures, accepted version to Physical Review D 79 | Phys.Rev.D79:023507,2009 | 10.1103/PhysRevD.79.023507 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper it is shown how to obtain the simplest equations for the
Mukhanov-Sasaki variables describing quantum linear scalar perturbations in the
case of scalar fields without potential term. This was done through the
implementation of canonical transformations at the classical level, and unitary
transformations... | [
{
"created": "Mon, 20 Oct 2008 12:14:10 GMT",
"version": "v1"
},
{
"created": "Tue, 13 Jan 2009 16:19:28 GMT",
"version": "v2"
}
] | 2009-01-21 | [
[
"Falciano",
"F. T.",
""
],
[
"Pinto-Neto",
"N.",
""
]
] | In this paper it is shown how to obtain the simplest equations for the Mukhanov-Sasaki variables describing quantum linear scalar perturbations in the case of scalar fields without potential term. This was done through the implementation of canonical transformations at the classical level, and unitary transformations a... |
0806.2716 | Molin Liu | Molin Liu, Hongya Liu, Yuanxing Gui | Quasi-Normal Modes of Massless Scalar Field around the 5D Ricci-flat
Black String | revtex4 source file, 11 pages, 5 figures | Class.Quant.Grav.25:105001,2008 | 10.1088/0264-9381/25/10/105001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | As one candidate of the higher dimensional black holes, the 5D Ricci-flat
black string is considered in this paper. By means of a non-trivial potential
$V_{n}$, the quasi-normal modes of a massless scalar field around this black
string space is studied. By using the classical third order WKB approximation,
we analyse... | [
{
"created": "Tue, 17 Jun 2008 07:15:24 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Liu",
"Molin",
""
],
[
"Liu",
"Hongya",
""
],
[
"Gui",
"Yuanxing",
""
]
] | As one candidate of the higher dimensional black holes, the 5D Ricci-flat black string is considered in this paper. By means of a non-trivial potential $V_{n}$, the quasi-normal modes of a massless scalar field around this black string space is studied. By using the classical third order WKB approximation, we analyse c... |
gr-qc/0508015 | Richard Woodard | E. O. Kahya and R. P. Woodard (University of Florida) | Charged Scalar Self-Mass during Inflation | 41 pages, LaTeX 2epsilon, 3 figures, uses axodraw | Phys.Rev. D72 (2005) 104001 | 10.1103/PhysRevD.72.104001 | UFIFT-QG-05-07 | gr-qc astro-ph hep-ph | null | We compute the one loop self-mass of a charged massless, minimally coupled
scalar in a locally de Sitter background geometry. The computation is done in
two different gauges: the noninvariant generalization of Feynman gauge which
gives the simplest expression for the photon propagator and the de Sitter
invariant gaug... | [
{
"created": "Wed, 3 Aug 2005 08:26:07 GMT",
"version": "v1"
}
] | 2013-05-29 | [
[
"Kahya",
"E. O.",
"",
"University of Florida"
],
[
"Woodard",
"R. P.",
"",
"University of Florida"
]
] | We compute the one loop self-mass of a charged massless, minimally coupled scalar in a locally de Sitter background geometry. The computation is done in two different gauges: the noninvariant generalization of Feynman gauge which gives the simplest expression for the photon propagator and the de Sitter invariant gauge ... |
1510.02035 | Kuantay Boshkayev | Kuantay Boshkayev, Hernando Quevedo, Saken Toktarbay, Bakytzhan Zhami
and Medeu Abishev | On the equivalence of approximate stationary axially symmetric solutions
of Einstein field equations | 8 pages | null | 10.1134/S0202289316040046 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study stationary axially symmetric solutions of the Einstein vacuum field
equations that can be used to describe the gravitational field of astrophysical
compact objects in the limiting case of slow rotation and slight deformation.
We derive explicitly the exterior Sedrakyan-Chubaryan approximate solution, and
exp... | [
{
"created": "Wed, 7 Oct 2015 17:28:51 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 2016 00:21:44 GMT",
"version": "v2"
}
] | 2016-12-07 | [
[
"Boshkayev",
"Kuantay",
""
],
[
"Quevedo",
"Hernando",
""
],
[
"Toktarbay",
"Saken",
""
],
[
"Zhami",
"Bakytzhan",
""
],
[
"Abishev",
"Medeu",
""
]
] | We study stationary axially symmetric solutions of the Einstein vacuum field equations that can be used to describe the gravitational field of astrophysical compact objects in the limiting case of slow rotation and slight deformation. We derive explicitly the exterior Sedrakyan-Chubaryan approximate solution, and expre... |
1009.3559 | Niall \'O Murchadha | Julian Barbour and Niall \'O Murchadha | Conformal Superspace: the configuration space of general relativity | null | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It has long been considered that conformal superspace is the natural
configuration space for canonical general relativity. However, this was never
definitively demonstrated. We have found that the standard conformal method of
solving the Einstein constraints has an unexpected extra symmetry. This allows
us to complet... | [
{
"created": "Sat, 18 Sep 2010 15:00:12 GMT",
"version": "v1"
}
] | 2010-09-21 | [
[
"Barbour",
"Julian",
""
],
[
"Murchadha",
"Niall Ó",
""
]
] | It has long been considered that conformal superspace is the natural configuration space for canonical general relativity. However, this was never definitively demonstrated. We have found that the standard conformal method of solving the Einstein constraints has an unexpected extra symmetry. This allows us to complete ... |
0907.1553 | Natalia Kiriushcheva | N. Kiriushcheva and S.V. Kuzmin | The Hamiltonian formulation of N-bein, Einstein-Cartan, gravity in any
dimension: the Progress Report (Extended version of a talk given on
CAIMS-2009, June 11-14, London, Canada) | 48 pages | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The Hamiltonian formulation of N-bein, Einstein-Cartan, gravity, using its
first order form in any dimension higher than two, is analyzed. This
Hamiltonian formulation allows to explicitly show where peculiarities of three
dimensional case (\textit{A.M.Frolov et al, 0902.0856 [gr-qc]}) occur and make
a conjecture, ba... | [
{
"created": "Thu, 9 Jul 2009 14:01:45 GMT",
"version": "v1"
}
] | 2009-07-11 | [
[
"Kiriushcheva",
"N.",
""
],
[
"Kuzmin",
"S. V.",
""
]
] | The Hamiltonian formulation of N-bein, Einstein-Cartan, gravity, using its first order form in any dimension higher than two, is analyzed. This Hamiltonian formulation allows to explicitly show where peculiarities of three dimensional case (\textit{A.M.Frolov et al, 0902.0856 [gr-qc]}) occur and make a conjecture, base... |
gr-qc/0502087 | Mark A. Miller | Mark Miller | Accuracy requirements for the calculation of gravitational waveforms
from coalescing compact binaries in numerical relativity | One figure added, various clarifications and references added;
accepted to Phys. Rev. D | Phys.Rev.D71:104016,2005 | 10.1103/PhysRevD.71.104016 | null | gr-qc astro-ph | null | I discuss the accuracy requirements on numerical relativity calculations of
inspiraling compact object binaries whose extracted gravitational waveforms are
to be used as templates for matched filtering signal extraction and physical
parameter estimation in modern interferometric gravitational wave detectors.
Using a ... | [
{
"created": "Mon, 21 Feb 2005 21:21:17 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Apr 2005 15:59:42 GMT",
"version": "v2"
}
] | 2014-11-17 | [
[
"Miller",
"Mark",
""
]
] | I discuss the accuracy requirements on numerical relativity calculations of inspiraling compact object binaries whose extracted gravitational waveforms are to be used as templates for matched filtering signal extraction and physical parameter estimation in modern interferometric gravitational wave detectors. Using a po... |
0810.5356 | Mairi Sakellariadou | Mairi Sakellariadou | Lattice refinement in loop quantum cosmology | 17 pages, 1 figure, to appear in the Proceedings of "Recent
Developments in Gravity-NEB XIII"; Thessaloniki (Greece), June 2008 | J.Phys.Conf.Ser.189:012035,2009 | 10.1088/1742-6596/189/1/012035 | null | gr-qc astro-ph hep-ph hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Lattice refinement in LQC, its meaning and its necessity are discussed. The
r\^ole of lattice refinement for the realisation of a successful inflationary
model is explicitly shown. A simple and effective numerical technique to solve
the constraint equation for any choice of lattice refinement model is briefly
illustr... | [
{
"created": "Wed, 29 Oct 2008 20:58:46 GMT",
"version": "v1"
}
] | 2009-11-05 | [
[
"Sakellariadou",
"Mairi",
""
]
] | Lattice refinement in LQC, its meaning and its necessity are discussed. The r\^ole of lattice refinement for the realisation of a successful inflationary model is explicitly shown. A simple and effective numerical technique to solve the constraint equation for any choice of lattice refinement model is briefly illustrat... |
0705.0787 | Parvin Moyassari | Hadi Salehi, Parvin Moyassari, Reza Rashidi | On the gravitational coupling of Hadamard states | 10 pages | null | null | null | gr-qc | null | We study the constraints imposed by the Hadamard condition on the two-point
function of local states of a scalar quantum field conformally coupled to a
gravitational background. We propose a method to assign a stress tensor to the
state-dependent part of the two point function which arises as a conserved
tensor with ... | [
{
"created": "Sun, 6 May 2007 09:10:33 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Salehi",
"Hadi",
""
],
[
"Moyassari",
"Parvin",
""
],
[
"Rashidi",
"Reza",
""
]
] | We study the constraints imposed by the Hadamard condition on the two-point function of local states of a scalar quantum field conformally coupled to a gravitational background. We propose a method to assign a stress tensor to the state-dependent part of the two point function which arises as a conserved tensor with an... |
1909.00438 | Charis Anastopoulos | Charis Anastopoulos and Ntina Savvidou | Multi-Time Measurements in Hawking Radiation: Information at
Higher-Order Correlations | 35 pages, 3 figures. Minor changes, some references added, version to
appear in Class. Quant. Grav | null | 10.1088/1361-6382/ab5eb2 | null | gr-qc hep-th quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is believed that no information can be stored in Hawking radiation,
because correlations between quanta of different field modes vanish. However,
such correlations have been defined only with reference to a single moment of
time. In this article, we develop a method for the evaluation of {\em
multi-time} correlati... | [
{
"created": "Sun, 1 Sep 2019 17:36:19 GMT",
"version": "v1"
},
{
"created": "Wed, 4 Dec 2019 17:39:07 GMT",
"version": "v2"
}
] | 2020-01-29 | [
[
"Anastopoulos",
"Charis",
""
],
[
"Savvidou",
"Ntina",
""
]
] | It is believed that no information can be stored in Hawking radiation, because correlations between quanta of different field modes vanish. However, such correlations have been defined only with reference to a single moment of time. In this article, we develop a method for the evaluation of {\em multi-time} correlation... |
2203.14631 | Sayan Kar | Sayan Kar (IIT Kharagpur, India) | Wormholes with a warped extra dimension? | 20 pages, 3 figures. Article prepared for the special issue of
General Relativity and Gravitation, dedicated to the memory of Professor
Thanu Padmanabhan. References added | null | 10.1007/s10714-022-02951-2 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | We investigate the role of a specifically warped extra dimension in
constructing examples of higher dimensional spacetimes representing Lorentzian
wormholes. The warping chosen is largely inspired by the well-known non-static
Witten bubble of nothing, though our spacetimes are static and geometrically
different. Vacu... | [
{
"created": "Mon, 28 Mar 2022 10:35:16 GMT",
"version": "v1"
},
{
"created": "Thu, 19 May 2022 05:20:06 GMT",
"version": "v2"
}
] | 2022-07-20 | [
[
"Kar",
"Sayan",
"",
"IIT Kharagpur, India"
]
] | We investigate the role of a specifically warped extra dimension in constructing examples of higher dimensional spacetimes representing Lorentzian wormholes. The warping chosen is largely inspired by the well-known non-static Witten bubble of nothing, though our spacetimes are static and geometrically different. Vacuum... |
1707.01092 | Paul Frampton | Paul H. Frampton | Holographic Entanglement Entropy in Cyclic Cosmology | 10 pages LaTeX. Rewritten to increase transparency | null | null | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss a cyclic cosmology in which the visible universe, or introverse,
is all that is accessible to an observer while the extroverse represents the
total spacetime originating from the time when the dark energy began to
dominate. It is argued that entanglement entropy of the introverse is the more
appropriate qu... | [
{
"created": "Tue, 4 Jul 2017 11:51:45 GMT",
"version": "v1"
},
{
"created": "Fri, 1 Sep 2017 14:15:10 GMT",
"version": "v2"
}
] | 2017-09-04 | [
[
"Frampton",
"Paul H.",
""
]
] | We discuss a cyclic cosmology in which the visible universe, or introverse, is all that is accessible to an observer while the extroverse represents the total spacetime originating from the time when the dark energy began to dominate. It is argued that entanglement entropy of the introverse is the more appropriate quan... |
gr-qc/0106029 | G. Sudhakaran | G.Sudhakaran, C.Sivaram | Cosmic repulsion in presence of matter | 11 pages | null | null | null | gr-qc | null | A basic problem that confronts the standard cosmological models is the
problem of initial singularity characterised by infinite material density,
infinite temperature and infinite spacetime curvature. The inevitable existence
of such a phase of the universe may be considered to be one of the major
drawbacks of Einste... | [
{
"created": "Thu, 7 Jun 2001 18:48:43 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Sudhakaran",
"G.",
""
],
[
"Sivaram",
"C.",
""
]
] | A basic problem that confronts the standard cosmological models is the problem of initial singularity characterised by infinite material density, infinite temperature and infinite spacetime curvature. The inevitable existence of such a phase of the universe may be considered to be one of the major drawbacks of Einstein... |
gr-qc/0610129 | Darragh Walsh Mr | D. M. Walsh | Non-uniqueness in conformal formulations of the Einstein constraints | Arguments clarified and typos corrected. Matches published version | Class.Quant.Grav.24:1911-1926,2007 | 10.1088/0264-9381/24/8/002 | null | gr-qc | null | Standard methods in non-linear analysis are used to show that there exists a
parabolic branching of solutions of the Lichnerowicz-York equation with an
unscaled source. We also apply these methods to the extended conformal thin
sandwich formulation and show that if the linearised system develops a kernel
solution for... | [
{
"created": "Thu, 26 Oct 2006 19:53:32 GMT",
"version": "v1"
},
{
"created": "Sat, 28 Apr 2007 23:51:16 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Walsh",
"D. M.",
""
]
] | Standard methods in non-linear analysis are used to show that there exists a parabolic branching of solutions of the Lichnerowicz-York equation with an unscaled source. We also apply these methods to the extended conformal thin sandwich formulation and show that if the linearised system develops a kernel solution for s... |
1307.1378 | Ehsan Hatefi | Luis Alvarez-Gaume, Ehsan Hatefi | More On Critical Collapse of Axion-Dilaton System in Dimension Four | 13 pages, Latex file, no figure,v2: to appear in JCAP | JCAP 1310 (2013) 037 | 10.1088/1475-7516/2013/10/037 | CERN-PH-TH/2013-249 | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We complete our previous study of critical gravitational collapse in the
axion-dilaton system by analysing the hyperbolic and parabolic ans\"atze. As
could be expected, the corresponding Choptuik exponents in four-dimensions
differ from the elliptic case.
| [
{
"created": "Thu, 4 Jul 2013 15:38:37 GMT",
"version": "v1"
},
{
"created": "Wed, 2 Oct 2013 18:00:29 GMT",
"version": "v2"
}
] | 2013-10-23 | [
[
"Alvarez-Gaume",
"Luis",
""
],
[
"Hatefi",
"Ehsan",
""
]
] | We complete our previous study of critical gravitational collapse in the axion-dilaton system by analysing the hyperbolic and parabolic ans\"atze. As could be expected, the corresponding Choptuik exponents in four-dimensions differ from the elliptic case. |
1809.07620 | Lorenzo Iorio | Lorenzo Iorio | On testing frame-dragging with LAGEOS and a recently announced geodetic
satellite | LaTex2e, 27 pages, 3 tables, 7 figures. Accepted for publication | Universe 2018, 4(11), 113 | 10.3390/universe4110113 | null | gr-qc physics.space-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, Ciufolini and coworkers announced the forthcoming launch of a new
cannonball geodetic satellite in 2019. It should be injected in an essentially
circular path with the same semimajor axis $a$ of LAGEOS, in orbit since 1976,
and an inclination $I$ of its orbital plane supplementary with respect to that
of it... | [
{
"created": "Tue, 18 Sep 2018 20:19:41 GMT",
"version": "v1"
},
{
"created": "Mon, 22 Oct 2018 14:01:21 GMT",
"version": "v2"
}
] | 2018-10-30 | [
[
"Iorio",
"Lorenzo",
""
]
] | Recently, Ciufolini and coworkers announced the forthcoming launch of a new cannonball geodetic satellite in 2019. It should be injected in an essentially circular path with the same semimajor axis $a$ of LAGEOS, in orbit since 1976, and an inclination $I$ of its orbital plane supplementary with respect to that of its ... |
2009.02311 | Pedro Alvarez | Pedro D. Alvarez, Benjamin Koch, Cristobal Laporte and Angel Rincon | Can scale-dependent cosmology alleviate the $H_0$ tension? | revised version, accepted for publication in JCAP | null | 10.1088/1475-7516/2021/06/019 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Scale-dependence is a common feature to all effective models of quantum
gravity. In this paper, a cosmological model based on the scale-dependent
scenario of gravity is presented. It is argued that such models, where the
scale-dependence appears as a correction to the classical $\Lambda$CDM
evolution, have the potent... | [
{
"created": "Fri, 4 Sep 2020 17:27:46 GMT",
"version": "v1"
},
{
"created": "Thu, 27 May 2021 20:33:14 GMT",
"version": "v2"
}
] | 2021-06-23 | [
[
"Alvarez",
"Pedro D.",
""
],
[
"Koch",
"Benjamin",
""
],
[
"Laporte",
"Cristobal",
""
],
[
"Rincon",
"Angel",
""
]
] | Scale-dependence is a common feature to all effective models of quantum gravity. In this paper, a cosmological model based on the scale-dependent scenario of gravity is presented. It is argued that such models, where the scale-dependence appears as a correction to the classical $\Lambda$CDM evolution, have the potentia... |
gr-qc/9705081 | Shijun Yoshida | Shijun Yoshida and Yasufumi Kojima | Accuracy of the relativistic Cowling approximation in slowly rotating
stars | 5 pages, LaTeX, 3 figures, to appear in Mon. Not. R. Astron. Soc | null | 10.1093/mnras/289.1.117 | null | gr-qc astro-ph | null | We have calculated the non-radial oscillation in slowly rotating relativistic
stars with the Cowling approximation. The frequencies are compared with those
based on the complete linearized equations of general relativity. It is found
that the results with the approximation differ by less than about $20 %$ for
typical... | [
{
"created": "Thu, 29 May 1997 11:14:44 GMT",
"version": "v1"
}
] | 2015-06-25 | [
[
"Yoshida",
"Shijun",
""
],
[
"Kojima",
"Yasufumi",
""
]
] | We have calculated the non-radial oscillation in slowly rotating relativistic stars with the Cowling approximation. The frequencies are compared with those based on the complete linearized equations of general relativity. It is found that the results with the approximation differ by less than about $20 %$ for typical r... |
gr-qc/0512124 | Zelnikov Andrei | Valeri P. Frolov and Andrei Zelnikov | Gravitational field of charged gyratons | 11 pages, some new comments and new references added. To appear in
Classical and Quantum Gravity | Class.Quant.Grav. 23 (2006) 2119-2128 | 10.1088/0264-9381/23/6/014 | Alberta-Thy-15-05 | gr-qc | null | We study relativistic gyratons which carry an electric charge. The
Einstein-Maxwell equations in arbitrary dimensions are solved exactly in the
case of a charged gyraton propagating in an asymptotically flat metric.
| [
{
"created": "Thu, 22 Dec 2005 00:03:20 GMT",
"version": "v1"
},
{
"created": "Thu, 9 Feb 2006 00:03:12 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Frolov",
"Valeri P.",
""
],
[
"Zelnikov",
"Andrei",
""
]
] | We study relativistic gyratons which carry an electric charge. The Einstein-Maxwell equations in arbitrary dimensions are solved exactly in the case of a charged gyraton propagating in an asymptotically flat metric. |
2406.01412 | Tomi Koivisto | Damianos Iosifidis, Erik Jensko, Tomi S. Koivisto | Relativistic interacting fluids in cosmology | 15 pages, 1 figure | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Motivated by cosmological applications for interacting matters, an extension
of the action functional for relativistic fluids is proposed to incorporate the
physics of non-adiabatic processes and chemical reactions. The former are
characterised by entropy growth, while the latter violate particle number
conservation.... | [
{
"created": "Mon, 3 Jun 2024 15:12:42 GMT",
"version": "v1"
}
] | 2024-06-04 | [
[
"Iosifidis",
"Damianos",
""
],
[
"Jensko",
"Erik",
""
],
[
"Koivisto",
"Tomi S.",
""
]
] | Motivated by cosmological applications for interacting matters, an extension of the action functional for relativistic fluids is proposed to incorporate the physics of non-adiabatic processes and chemical reactions. The former are characterised by entropy growth, while the latter violate particle number conservation. T... |
2012.05424 | Ran Li | Ran Li, Jin Wang | Energy and entropy compensation, phase transition and kinetics of four
dimensional charged Gauss-Bonnet Anti-de Sitter black holes on the underlying
free energy landscape | References added | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the phase transition and the kinetics of the four dimensional
charged AdS black hole in GB gravity based on the free energy landscape. Below
the critical temperature, the free energy landscape topography has the shape of
double basins with each representing one stable/unstable black hole phase. The
thermodyn... | [
{
"created": "Thu, 10 Dec 2020 02:50:41 GMT",
"version": "v1"
},
{
"created": "Sat, 12 Dec 2020 02:46:24 GMT",
"version": "v2"
}
] | 2020-12-15 | [
[
"Li",
"Ran",
""
],
[
"Wang",
"Jin",
""
]
] | We study the phase transition and the kinetics of the four dimensional charged AdS black hole in GB gravity based on the free energy landscape. Below the critical temperature, the free energy landscape topography has the shape of double basins with each representing one stable/unstable black hole phase. The thermodynam... |
1205.0911 | Alejandro Perez | Alejandro Perez | The new spin foam models and quantum gravity | To appear in Papers in Physics | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this article we give a systematic definition of the recently introduced
spin foam models for four dimensional quantum gravity reviewing the main
results on their semiclassical limit on fixed discretizations.
| [
{
"created": "Fri, 4 May 2012 10:42:37 GMT",
"version": "v1"
}
] | 2012-05-07 | [
[
"Perez",
"Alejandro",
""
]
] | In this article we give a systematic definition of the recently introduced spin foam models for four dimensional quantum gravity reviewing the main results on their semiclassical limit on fixed discretizations. |
gr-qc/0010036 | Hiroyuki Nakano | Hiroyuki Nakano, Misao Sasaki | Gravitational reaction force on a particle in the Schwarzschild
background | 15 pages, no figure, submitted to Prog. Theor. Phys | Prog.Theor.Phys.105:197-218,2001 | 10.1143/PTP.105.197 | OU-TAP-145 | gr-qc astro-ph | null | We formulate a new method to calculate the gravitational reaction force on a
particle of mass $\mu$ orbiting a massive black hole of mass $M$. In this
formalism, the tail part of the retarded Green function, which is responsible
for the reaction force, is calculated at the level of the Teukolsky equation.
Our method ... | [
{
"created": "Tue, 10 Oct 2000 08:56:38 GMT",
"version": "v1"
},
{
"created": "Tue, 17 Oct 2000 06:45:13 GMT",
"version": "v2"
},
{
"created": "Wed, 17 Jan 2001 03:50:08 GMT",
"version": "v3"
}
] | 2009-10-09 | [
[
"Nakano",
"Hiroyuki",
""
],
[
"Sasaki",
"Misao",
""
]
] | We formulate a new method to calculate the gravitational reaction force on a particle of mass $\mu$ orbiting a massive black hole of mass $M$. In this formalism, the tail part of the retarded Green function, which is responsible for the reaction force, is calculated at the level of the Teukolsky equation. Our method na... |
gr-qc/0506031 | Hermann Nicolai | H. Nicolai | Gravitational Billiards, Dualities and Hidden Symmetries | 37 pages, invited contribution to the volume "100 years of relativity
spacetime structure: Einstein and beyond", ed. A. Ashtekar | null | null | AEI-2005-024 | gr-qc | null | The purpose of this article is to highlight the fascinating, but only very
incompletely understood relation between Einstein's theory and its
generalizations on the one hand, and the theory of indefinite, and in
particular hyperbolic, Kac Moody algebras on the other. The elucidation of this
link could lead to yet ano... | [
{
"created": "Mon, 6 Jun 2005 08:10:07 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Nicolai",
"H.",
""
]
] | The purpose of this article is to highlight the fascinating, but only very incompletely understood relation between Einstein's theory and its generalizations on the one hand, and the theory of indefinite, and in particular hyperbolic, Kac Moody algebras on the other. The elucidation of this link could lead to yet anoth... |
0905.2730 | Ahmadjon Abdujabbarov | Ahmadjon Abdujabbarov, Bobomurat Ahmedov | Charged Particle Motion Around Rotating Black Hole in Braneworld
Immersed in Magnetic Field | 9 pages, 8 figures, revised version to be resubmitted to Phys. Rev. D | Phys.Rev.D81:044022,2010 | 10.1103/PhysRevD.81.044022 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Analytical solutions of Maxwell equations in background spacetime of black
hole in braneworld immersed in external uniform magnetic field have been found.
Influence of both magnetic and brane parameters on effective potential of the
radial motion of charged test particle around slowly rotating black hole in
braneworl... | [
{
"created": "Sun, 17 May 2009 11:47:04 GMT",
"version": "v1"
}
] | 2010-05-12 | [
[
"Abdujabbarov",
"Ahmadjon",
""
],
[
"Ahmedov",
"Bobomurat",
""
]
] | Analytical solutions of Maxwell equations in background spacetime of black hole in braneworld immersed in external uniform magnetic field have been found. Influence of both magnetic and brane parameters on effective potential of the radial motion of charged test particle around slowly rotating black hole in braneworld ... |
1609.03613 | Davi Rodrigues | Davi C. Rodrigues, Sebasti\~ao Mauro, \'Alefe O. F. de Almeida | Solar System constraints on Renormalization Group extended General
Relativity: The PPN and Laplace-Runge-Lenz analyses with the external
potential effect | 13 pages, 4 figures. Added references and minor corrections in text.
Version to appear in PRD | Phys. Rev. D 94, 084036 (2016) | 10.1103/PhysRevD.94.084036 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | General Relativity extensions based on Renormalization Group effects are
motivated by a known physical principle and constitute a class of extended
gravity theories that have some unexplored unique aspects. In this work we
develop in detail the Newtonian and post Newtonian limits of a realisation
called Renormalizati... | [
{
"created": "Mon, 12 Sep 2016 21:59:34 GMT",
"version": "v1"
},
{
"created": "Sun, 9 Oct 2016 21:19:23 GMT",
"version": "v2"
}
] | 2016-10-27 | [
[
"Rodrigues",
"Davi C.",
""
],
[
"Mauro",
"Sebastião",
""
],
[
"de Almeida",
"Álefe O. F.",
""
]
] | General Relativity extensions based on Renormalization Group effects are motivated by a known physical principle and constitute a class of extended gravity theories that have some unexplored unique aspects. In this work we develop in detail the Newtonian and post Newtonian limits of a realisation called Renormalization... |
1401.1400 | Mohammad Reza Setare | M. R. Setare and V. Kamali | Some aspects of non-abelian gauge field inflation model | 12 pages, 4 figures. arXiv admin note: substantial text overlap with
arXiv:1308.5674 | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study non-abelian gauge field inflation (gauge-flation)
model in the context of intermediate and logamediate scenario. Important
parameters of this model are presented for these two cases. Numerical study
shows that the intermediate and logamediate gauge-flation are compatible with
WMAP9 observationa... | [
{
"created": "Mon, 6 Jan 2014 06:12:09 GMT",
"version": "v1"
}
] | 2014-01-08 | [
[
"Setare",
"M. R.",
""
],
[
"Kamali",
"V.",
""
]
] | In this paper we study non-abelian gauge field inflation (gauge-flation) model in the context of intermediate and logamediate scenario. Important parameters of this model are presented for these two cases. Numerical study shows that the intermediate and logamediate gauge-flation are compatible with WMAP9 observational ... |
gr-qc/0405091 | John W. Moffat | J. W. Moffat | Modified Gravitational Theory and the Gravity Probe-B Gyroscope
Experiment | 8 pages, LeTex file, no figures | null | null | null | gr-qc | null | A possible deviation from the precession of the Gravity Probe-B gyroscope
predicted by general relativity is obtained in the nonsymmetric gravity theory.
The time delay of radio signals emitted by spacecraft at planetary distances
from the Sun, in nonsymmetric gravity theory is the same as in general
relativity. A co... | [
{
"created": "Mon, 17 May 2004 23:08:51 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Moffat",
"J. W.",
""
]
] | A possible deviation from the precession of the Gravity Probe-B gyroscope predicted by general relativity is obtained in the nonsymmetric gravity theory. The time delay of radio signals emitted by spacecraft at planetary distances from the Sun, in nonsymmetric gravity theory is the same as in general relativity. A corr... |
1511.00226 | Alexander Pavlov E | Alexander E. Pavlov | Exact solutions of Friedmann equation for supernovae data | 7 pages, 2 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An intrinsic time of homogeneous models is global. The Friedmann equation by
its sense ties time intervals. Exact solutions of the Friedmann equation in
Standard cosmology and Conformal cosmology are presented. Theoretical curves
interpolated the Hubble diagram on latest supernovae are expressed in
analytical form. T... | [
{
"created": "Sun, 1 Nov 2015 10:45:24 GMT",
"version": "v1"
}
] | 2015-11-03 | [
[
"Pavlov",
"Alexander E.",
""
]
] | An intrinsic time of homogeneous models is global. The Friedmann equation by its sense ties time intervals. Exact solutions of the Friedmann equation in Standard cosmology and Conformal cosmology are presented. Theoretical curves interpolated the Hubble diagram on latest supernovae are expressed in analytical form. The... |
1001.2220 | Narit Pidokrajt | Jan E. Aman, Narit Pidokrajt | Critical phenomena and information geometry in black hole physics | Contribution to ERE2009, 5 pages | J.Phys.Conf.Ser.229:012060,2010 | 10.1088/1742-6596/229/1/012060 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss the use of information geometry in black hole physics and present
the outcomes. The type of information geometry we utilize in this approach is
the thermodynamic (Ruppeiner) geometry defined on the state space of a given
thermodynamic system in equilibrium. The Ruppeiner geometry can be used to
analyze sta... | [
{
"created": "Wed, 13 Jan 2010 16:19:40 GMT",
"version": "v1"
}
] | 2011-02-18 | [
[
"Aman",
"Jan E.",
""
],
[
"Pidokrajt",
"Narit",
""
]
] | We discuss the use of information geometry in black hole physics and present the outcomes. The type of information geometry we utilize in this approach is the thermodynamic (Ruppeiner) geometry defined on the state space of a given thermodynamic system in equilibrium. The Ruppeiner geometry can be used to analyze stabi... |
1811.05640 | Chiang-Mei Chen | Chiang-Mei Chen, Jian-Liang Liu, James M. Nester | Quasi-local energy from a Minkowski reference | 14 pages, accepted by Gen Rel Grav, selected as an Editor's Choice | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The specification of energy for gravitating systems has been an unsettled
issue since Einstein proposed his pseudotensor. It is now understood that
energy-momentum is \emph{quasi-local} (associated with a closed 2-surface).
Here we consider quasi-local proposals (including pseudotensors) in the
Lagrangian-Noether-Ham... | [
{
"created": "Wed, 14 Nov 2018 04:59:38 GMT",
"version": "v1"
}
] | 2018-11-15 | [
[
"Chen",
"Chiang-Mei",
""
],
[
"Liu",
"Jian-Liang",
""
],
[
"Nester",
"James M.",
""
]
] | The specification of energy for gravitating systems has been an unsettled issue since Einstein proposed his pseudotensor. It is now understood that energy-momentum is \emph{quasi-local} (associated with a closed 2-surface). Here we consider quasi-local proposals (including pseudotensors) in the Lagrangian-Noether-Hamil... |
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