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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
2003.11020 | Konstantin Osetrin | Evgeny Osetrin, Konstantin Osetrin, Altair Filippov | Spatially homogeneous models of St\"ackel spacetimes of type (2.1) | 10 pages. arXiv admin note: substantial text overlap with
arXiv:2003.10141 | null | 10.1007/s11182-020-02051-1 | null | gr-qc math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | All classes of spatially homogeneous space-time models are found that allow
the integration of the equations of motion of test particles and the eikonal
equation by the method of complete separation of variables according to type
(2.1). Four classes of model data are obtained. The resulting models can be
applied in a... | [
{
"created": "Mon, 23 Mar 2020 10:14:29 GMT",
"version": "v1"
}
] | 2020-08-26 | [
[
"Osetrin",
"Evgeny",
""
],
[
"Osetrin",
"Konstantin",
""
],
[
"Filippov",
"Altair",
""
]
] | All classes of spatially homogeneous space-time models are found that allow the integration of the equations of motion of test particles and the eikonal equation by the method of complete separation of variables according to type (2.1). Four classes of model data are obtained. The resulting models can be applied in any... |
gr-qc/0411007 | Xinhe Meng | Xin He Meng and Peng Wang | Palatini formulation of the $R^{-1}$modified gravity with an
additionally squared scalar curvature term | 14 pages, accepted for publication by CQG | Class.Quant.Grav. 22 (2005) 23-32 | 10.1088/0264-9381/22/1/002 | null | gr-qc | null | In this paper by deriving the Modified Friedmann equation in the Palatini
formulation of $R^2$ gravity, first we discuss the problem of whether in
Palatini formulation an additional $R^2$ term in Einstein's General Relativity
action can drive an inflation. We show that the Palatini formulation of $R^2$
gravity cannot... | [
{
"created": "Sat, 30 Oct 2004 22:39:38 GMT",
"version": "v1"
}
] | 2009-11-10 | [
[
"Meng",
"Xin He",
""
],
[
"Wang",
"Peng",
""
]
] | In this paper by deriving the Modified Friedmann equation in the Palatini formulation of $R^2$ gravity, first we discuss the problem of whether in Palatini formulation an additional $R^2$ term in Einstein's General Relativity action can drive an inflation. We show that the Palatini formulation of $R^2$ gravity cannot l... |
gr-qc/0110025 | Carlos F. Sopuerta | Carlos F. Sopuerta (RCG, Portsmouth U.) | Equilibrium configurations in the dynamics of irrotational dust matter | 25 pages, LaTeX2e, IOP style. To appear in Classical and Quantum
Gravity | Class.Quant.Grav. 18 (2001) 4779-4800 | 10.1088/0264-9381/18/22/305 | RCG 01/07 | gr-qc | null | Irrotational dust solutions of Einstein's equations are suitable models to
describe the general-relativistic aspects of the gravitational instability
mechanism for the formation of cosmic structures. In this paper we study their
state space by considering the local initial-value problem formulated in the
covariant fl... | [
{
"created": "Thu, 4 Oct 2001 12:55:35 GMT",
"version": "v1"
}
] | 2009-11-07 | [
[
"Sopuerta",
"Carlos F.",
"",
"RCG, Portsmouth U."
]
] | Irrotational dust solutions of Einstein's equations are suitable models to describe the general-relativistic aspects of the gravitational instability mechanism for the formation of cosmic structures. In this paper we study their state space by considering the local initial-value problem formulated in the covariant flui... |
0909.1541 | Alex Bernardini | Alex E. Bernardini, O. Bertolami | Stability of mass varying particle lumps | 26 pages, 7 figures | Phys.Rev. D80 (2009) 123011 | 10.1103/PhysRevD.80.123011 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The theoretical description of compact structures that share some key
features with mass varying particles allows for a simple analysis of
equilibrium and stability for massive stellar bodies. We investigate static,
spherically symmetric solutions of Einstein equations for a system composed by
nonbaryonic matter (neu... | [
{
"created": "Tue, 8 Sep 2009 18:47:38 GMT",
"version": "v1"
},
{
"created": "Fri, 11 Dec 2009 12:34:22 GMT",
"version": "v2"
}
] | 2010-01-05 | [
[
"Bernardini",
"Alex E.",
""
],
[
"Bertolami",
"O.",
""
]
] | The theoretical description of compact structures that share some key features with mass varying particles allows for a simple analysis of equilibrium and stability for massive stellar bodies. We investigate static, spherically symmetric solutions of Einstein equations for a system composed by nonbaryonic matter (neutr... |
gr-qc/9705059 | Carlo Rovelli | Carlo Rovelli and Thomas Thiemann | The Immirzi parameter in quantum general relativity | 6 pages, no figures, LaTeX, revtex | Phys.Rev. D57 (1998) 1009-1014 | 10.1103/PhysRevD.57.1009 | Preprint HUTMP-97/B-366 | gr-qc | null | Barbero has generalized the Ashtekar canonical transformation to a
one-parameter scale transformation $U(\iota)$ on the phase space of general
relativity. Immirzi has noticed that in loop quantum gravity this
transformation alters the spectra of geometrical quantities. We show that
$U(\iota)$ is a canonical transform... | [
{
"created": "Thu, 22 May 1997 08:24:15 GMT",
"version": "v1"
}
] | 2009-10-30 | [
[
"Rovelli",
"Carlo",
""
],
[
"Thiemann",
"Thomas",
""
]
] | Barbero has generalized the Ashtekar canonical transformation to a one-parameter scale transformation $U(\iota)$ on the phase space of general relativity. Immirzi has noticed that in loop quantum gravity this transformation alters the spectra of geometrical quantities. We show that $U(\iota)$ is a canonical transformat... |
2002.01897 | Macarena Lagos | Macarena Lagos, Pedro G. Ferreira, Oliver J. Tattersall | Anomalous decay rate of quasinormal modes | Updated to published version | Phys. Rev. D 101, 084018 (2020) | 10.1103/PhysRevD.101.084018 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The decay timescales of the quasinormal modes of a massive scalar field have
an intriguing behavior: they either grow or decay with increasing angular
harmonic numbers $\ell$, depending on whether the mass of the scalar field is
small or large. We identify the properties of the effective potential of the
scalar field... | [
{
"created": "Wed, 5 Feb 2020 17:59:45 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Apr 2020 14:34:35 GMT",
"version": "v2"
}
] | 2020-04-15 | [
[
"Lagos",
"Macarena",
""
],
[
"Ferreira",
"Pedro G.",
""
],
[
"Tattersall",
"Oliver J.",
""
]
] | The decay timescales of the quasinormal modes of a massive scalar field have an intriguing behavior: they either grow or decay with increasing angular harmonic numbers $\ell$, depending on whether the mass of the scalar field is small or large. We identify the properties of the effective potential of the scalar field t... |
1708.04611 | Claus Gerhardt | Claus Gerhardt | The quantization of a Kerr-AdS black hole | 20 pages. arXiv admin note: substantial text overlap with
arXiv:1608.08209 | Advances in Mathematical Physics vol. 2018 (2018), Article ID
4328312, 10 pages | 10.1155/2018/4328312 | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We apply our model of quantum gravity to a Kerr-AdS spacetime of dimension $2
m+1$, $m\ge2$, where all rotational parameters are equal, resulting in a wave
equation in a quantum spacetime which has a sequence of solutions that can be
expressed as a product of stationary and temporal eigenfunctions. The
stationary eig... | [
{
"created": "Wed, 9 Aug 2017 10:47:13 GMT",
"version": "v1"
}
] | 2018-02-06 | [
[
"Gerhardt",
"Claus",
""
]
] | We apply our model of quantum gravity to a Kerr-AdS spacetime of dimension $2 m+1$, $m\ge2$, where all rotational parameters are equal, resulting in a wave equation in a quantum spacetime which has a sequence of solutions that can be expressed as a product of stationary and temporal eigenfunctions. The stationary eigen... |
gr-qc/9911069 | Juan Eloy Ayon Beato | Eloy Ay\'on-Beato, Alberto Garc\'ia, Alfredo Mac\'ias and Hernando
Quevedo | Uniqueness theorems for static black holes in metric-affine gravity | 12 pages, RevTex, to appear in Phys. Rev. D | Phys.Rev. D61 (2000) 084017 | 10.1103/PhysRevD.61.084017 | null | gr-qc hep-th | null | Using the equivalence theorem for the triplet ansatz sector of metric-affine
gravity (MAG) theories and the Einstein-Proca system, it is shown that the only
static black hole of the triplet sector of MAG is the Schwarzschild solution,
under the constraint (-4\beta_4 + k_1\beta_5/2k_0 + k_2\gamma_4/k_0)/\kappa z_4
\ne... | [
{
"created": "Fri, 19 Nov 1999 00:00:46 GMT",
"version": "v1"
}
] | 2016-08-15 | [
[
"Ayón-Beato",
"Eloy",
""
],
[
"García",
"Alberto",
""
],
[
"Macías",
"Alfredo",
""
],
[
"Quevedo",
"Hernando",
""
]
] | Using the equivalence theorem for the triplet ansatz sector of metric-affine gravity (MAG) theories and the Einstein-Proca system, it is shown that the only static black hole of the triplet sector of MAG is the Schwarzschild solution, under the constraint (-4\beta_4 + k_1\beta_5/2k_0 + k_2\gamma_4/k_0)/\kappa z_4 \neq ... |
1404.6536 | Monica Forte | M\'onica Forte | Linking phantom quintessences and tachyons | 3 pages, no figures, accepted for publication in Phys. Rev. D | null | 10.1103/PhysRevD.90.027302 | null | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a nonparametric form-invariance transformation through which we
establish a link between phantom and tachyonic models in flat
Friedmann-Robertson-Walker cosmologies.
| [
{
"created": "Thu, 24 Apr 2014 19:42:45 GMT",
"version": "v1"
},
{
"created": "Mon, 30 Jun 2014 22:28:22 GMT",
"version": "v2"
}
] | 2015-06-19 | [
[
"Forte",
"Mónica",
""
]
] | We present a nonparametric form-invariance transformation through which we establish a link between phantom and tachyonic models in flat Friedmann-Robertson-Walker cosmologies. |
0905.4562 | Valter Moretti | Lorenzo Franceschini | Topological sectors for Weyl-algebra net in the Einstein cylindrical
universe | Ph.D. Thesis - University of Trento, Department of Mathematics, 126
pages | null | null | null | gr-qc hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This paper is an extended and more detailed version of arXiv:0812.0533. We
tackle the problem of constructing explicit examples of topological cocycles of
Roberts' net cohomology, as defined abstractly by Brunetti and Ruzzi. We
consider the simple case of massive bosonic quantum field theory on the two
dimensional Ei... | [
{
"created": "Thu, 28 May 2009 06:48:39 GMT",
"version": "v1"
}
] | 2009-05-30 | [
[
"Franceschini",
"Lorenzo",
""
]
] | This paper is an extended and more detailed version of arXiv:0812.0533. We tackle the problem of constructing explicit examples of topological cocycles of Roberts' net cohomology, as defined abstractly by Brunetti and Ruzzi. We consider the simple case of massive bosonic quantum field theory on the two dimensional Eins... |
gr-qc/9805085 | Andrew P. Billyard | A. P. Billyard, A. A. Coley, R. J. van den Hoogen | The stability of cosmological scaling solutions | AMSTeX, 7 pages, re-submitted to Phys Rev Lett | Phys.Rev. D58 (1998) 123501 | 10.1103/PhysRevD.58.123501 | Dal-98-08 | gr-qc hep-th | null | We study the stability of cosmological scaling solutions within the class of
spatially homogeneous cosmological models with a perfect fluid subject to the
equation of state p_gamma=(gamma-1) rho_gamma (where gamma is a constant
satisfying 0 < gamma < 2) and a scalar field with an exponential potential. The
scaling so... | [
{
"created": "Thu, 21 May 1998 15:30:53 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jul 1998 17:41:53 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Billyard",
"A. P.",
""
],
[
"Coley",
"A. A.",
""
],
[
"Hoogen",
"R. J. van den",
""
]
] | We study the stability of cosmological scaling solutions within the class of spatially homogeneous cosmological models with a perfect fluid subject to the equation of state p_gamma=(gamma-1) rho_gamma (where gamma is a constant satisfying 0 < gamma < 2) and a scalar field with an exponential potential. The scaling solu... |
gr-qc/0004065 | Luis Lehner | Luis Lehner, Mijan Huq and David Garrison | Notes on causal differencing in ADM/CADM formulations: a 1D comparison | 11 pages, 6 figures. These notes illustrate how excision techniques
already developed for ADM (in the form usually used in numerical relativity)
codes can be straightforwardly applied in the so called `conformal ADM'. A
comparison of the solutions obtained with both formulations is carried out
highlighting when... | null | null | null | gr-qc | null | Causal differencing has shown to be one of the promising and successful
approaches towards excising curvature singularities from numerical simulations
of black hole spacetimes. So far it has only been actively implemented in the
ADM and Einstein-Bianchi 3+1 formulations of the Einstein equations. Recently,
an approac... | [
{
"created": "Wed, 19 Apr 2000 22:45:24 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Lehner",
"Luis",
""
],
[
"Huq",
"Mijan",
""
],
[
"Garrison",
"David",
""
]
] | Causal differencing has shown to be one of the promising and successful approaches towards excising curvature singularities from numerical simulations of black hole spacetimes. So far it has only been actively implemented in the ADM and Einstein-Bianchi 3+1 formulations of the Einstein equations. Recently, an approach ... |
1909.06405 | Vyacheslav Dokuchaev | Victor Berezin, Vyacheslav Dokuchaev, Yury Eroshenko and Alexei
Smirnov | Least action principle and gravitational double layer | 8 pages | IJMPA 35, 2040002 (2020) | 10.1142/S0217751X20400023 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The higher derivative gravitational theories exhibit new phenomena absent in
General Relativity. One of them is the possible formation of the so called
double layer which is the pure gravitational phenomenon and can be interpreted,
in a sense, as the gravitational shock wave. In this paper we show how some
very impor... | [
{
"created": "Fri, 13 Sep 2019 18:51:05 GMT",
"version": "v1"
}
] | 2020-03-20 | [
[
"Berezin",
"Victor",
""
],
[
"Dokuchaev",
"Vyacheslav",
""
],
[
"Eroshenko",
"Yury",
""
],
[
"Smirnov",
"Alexei",
""
]
] | The higher derivative gravitational theories exhibit new phenomena absent in General Relativity. One of them is the possible formation of the so called double layer which is the pure gravitational phenomenon and can be interpreted, in a sense, as the gravitational shock wave. In this paper we show how some very importa... |
gr-qc/0604073 | Ramin G. Daghigh | Ramin G. Daghigh, Gabor Kunstatter, Dave Ostapchuk, and Vince Bagnulo | The Highly Damped Quasinormal Modes of $d$-dimensional
Reissner-Nordstrom Black Holes in the Small Charge Limit | 18 pages, 8 figures | Class.Quant.Grav. 23 (2006) 5101-5116 | 10.1088/0264-9381/23/17/002 | null | gr-qc | null | We analyze in detail the highly damped quasinormal modes of $d$-dimensional
Reissner-Nordstr$\ddot{\rm{o}}$m black holes with small charge, paying
particular attention to the large but finite damping limit in which the
Schwarzschild results should be valid. In the infinite damping limit, we
confirm using different me... | [
{
"created": "Mon, 17 Apr 2006 19:57:20 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Jun 2006 01:14:38 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Daghigh",
"Ramin G.",
""
],
[
"Kunstatter",
"Gabor",
""
],
[
"Ostapchuk",
"Dave",
""
],
[
"Bagnulo",
"Vince",
""
]
] | We analyze in detail the highly damped quasinormal modes of $d$-dimensional Reissner-Nordstr$\ddot{\rm{o}}$m black holes with small charge, paying particular attention to the large but finite damping limit in which the Schwarzschild results should be valid. In the infinite damping limit, we confirm using different meth... |
gr-qc/0404061 | Claus Gerhardt | Claus Gerhardt | Transition from big crunch to big bang in brane cosmology | 20 pages, a pdf version can also be retrieved from
http://www.math.uni-heidelberg.de/studinfo/gerhardt/brane.pdf and bibtex data
from http://www.math.uni-heidelberg.de/studinfo/gerhardt/bibtexcgbrane.html,
v5: the results of http://arXiv.org/abs/gr-qc/0404112 have been applied to
ARW branes, the introduction ha... | Adv.Theor.Math.Phys. 8 (2004) 319-343 | null | null | gr-qc hep-th math.DG | null | We consider branes $N=I\times\so$, where $\so$ is an $n$\ndash dimensional
space form, not necessarily compact, in a Schwarzschild-AdS_{(n+2)} bulk $\mc
N$. The branes have a big crunch singularity. If a brane is an ARW space, then,
under certain conditions, there exists a smooth natural transition flow through
the s... | [
{
"created": "Tue, 13 Apr 2004 19:52:25 GMT",
"version": "v1"
},
{
"created": "Wed, 14 Apr 2004 13:10:38 GMT",
"version": "v2"
},
{
"created": "Mon, 19 Apr 2004 20:52:32 GMT",
"version": "v3"
},
{
"created": "Wed, 21 Apr 2004 14:28:21 GMT",
"version": "v4"
},
{
"c... | 2007-05-23 | [
[
"Gerhardt",
"Claus",
""
]
] | We consider branes $N=I\times\so$, where $\so$ is an $n$\ndash dimensional space form, not necessarily compact, in a Schwarzschild-AdS_{(n+2)} bulk $\mc N$. The branes have a big crunch singularity. If a brane is an ARW space, then, under certain conditions, there exists a smooth natural transition flow through the sin... |
1407.5989 | Deirdre Shoemaker | James Healy and Pablo Laguna and Deirdre Shoemaker | Decoding the final state in binary black hole mergers | null | null | 10.1088/0264-9381/31/21/212001 | null | gr-qc astro-ph.CO astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We demonstrate that in binary black hole mergers there is a direct
correlation between the frequency of the gravitational wave at peak amplitude
and the mass and spin of the final black hole. This correlation could
potentially assist with the analysis of gravitational wave observations from
binary black hole mergers.... | [
{
"created": "Tue, 22 Jul 2014 21:08:32 GMT",
"version": "v1"
}
] | 2015-06-22 | [
[
"Healy",
"James",
""
],
[
"Laguna",
"Pablo",
""
],
[
"Shoemaker",
"Deirdre",
""
]
] | We demonstrate that in binary black hole mergers there is a direct correlation between the frequency of the gravitational wave at peak amplitude and the mass and spin of the final black hole. This correlation could potentially assist with the analysis of gravitational wave observations from binary black hole mergers. |
0705.1836 | Saibal Ray | Saibal Ray, Utpal Mukhopadhyay and Partha Pratim Ghosh | Large Number Hypothesis: A Review | 21 pages Latex, 0 figures, submitted to GRG | null | null | null | gr-qc astro-ph | null | Large dimensionless numbers, arising out of ratios of various physical
constants, intrigued many scientists, especially Dirac. Relying on the
coincidence of large numbers, Dirac arrived at the revolutionary hypothesis
that the gravitational constant $G$ should vary inversely as the cosmic time
$t$. This hypothesis of... | [
{
"created": "Sun, 13 May 2007 15:40:03 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Ray",
"Saibal",
""
],
[
"Mukhopadhyay",
"Utpal",
""
],
[
"Ghosh",
"Partha Pratim",
""
]
] | Large dimensionless numbers, arising out of ratios of various physical constants, intrigued many scientists, especially Dirac. Relying on the coincidence of large numbers, Dirac arrived at the revolutionary hypothesis that the gravitational constant $G$ should vary inversely as the cosmic time $t$. This hypothesis of D... |
0705.3587 | Shahram Jalalzadeh | P. Pedram, S. Jalalzadeh, and S. S. Gousheh | Schr\"odinger-Wheeler-DeWitt equation in chaplygin gas FRW cosmological
model | 11 pages, 1 figure, to appear in IJTP | Int.J.Theor.Phys.46:3201-3208,2007 | 10.1007/s10773-007-9436-9 | null | gr-qc | null | We present a chaplygin gas Friedmann-Robertson-Walker quantum cosmological
model. In this work the Schutz's variational formalism is applied with
positive, negative, and zero constant spatial curvature. In this approach the
notion of time can be recovered. These give rise to
Schr\"odinger-Wheeler-DeWitt equation for ... | [
{
"created": "Thu, 24 May 2007 14:01:26 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Pedram",
"P.",
""
],
[
"Jalalzadeh",
"S.",
""
],
[
"Gousheh",
"S. S.",
""
]
] | We present a chaplygin gas Friedmann-Robertson-Walker quantum cosmological model. In this work the Schutz's variational formalism is applied with positive, negative, and zero constant spatial curvature. In this approach the notion of time can be recovered. These give rise to Schr\"odinger-Wheeler-DeWitt equation for th... |
1704.07391 | Wolfgang Wieland | Wolfgang Wieland | New boundary variables for classical and quantum gravity on a null
surface | 41 pages, one figure | Class. Quantum Grav. 34 (2017), 215008 (30pp) | 10.1088/1361-6382/aa8d06 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The covariant Hamiltonian formulation for general relativity is studied in
terms of self-dual variables on a manifold with an internal and lightlike
boundary. At this inner boundary, new canonical variables appear: a spinor and
a spinor-valued two-form that encode the entire intrinsic geometry of the null
surface. At... | [
{
"created": "Mon, 24 Apr 2017 18:00:18 GMT",
"version": "v1"
}
] | 2017-11-07 | [
[
"Wieland",
"Wolfgang",
""
]
] | The covariant Hamiltonian formulation for general relativity is studied in terms of self-dual variables on a manifold with an internal and lightlike boundary. At this inner boundary, new canonical variables appear: a spinor and a spinor-valued two-form that encode the entire intrinsic geometry of the null surface. At a... |
gr-qc/0605144 | Lorenzo Iorio | Lorenzo Iorio | Perspectives in measuring the PPN parameters beta and gamma in the
Earth's gravitational fields with the CHAMP/GRACE models | LaTex2e, 14 pages, 3 tables, no figures, 75 references. To appear in
Int. J. Mod. Phys. D | Int.J.Mod.Phys.D17:815-829,2008 | 10.1142/S0218271808012516 | null | gr-qc astro-ph | null | The current bounds on the PPN parameters gamma and beta are of the order of
10^-4-10^-5. Various missions aimed at improving such limits by several orders
of magnitude have more or less recently been proposed like LATOR, ASTROD,
BepiColombo and GAIA. They involve the use of various spacecraft, to be
launched along in... | [
{
"created": "Tue, 30 May 2006 15:01:45 GMT",
"version": "v1"
},
{
"created": "Sun, 2 Jul 2006 14:51:47 GMT",
"version": "v2"
},
{
"created": "Sat, 16 Jun 2007 08:42:11 GMT",
"version": "v3"
},
{
"created": "Sun, 29 Jul 2007 15:40:53 GMT",
"version": "v4"
},
{
"cr... | 2008-11-26 | [
[
"Iorio",
"Lorenzo",
""
]
] | The current bounds on the PPN parameters gamma and beta are of the order of 10^-4-10^-5. Various missions aimed at improving such limits by several orders of magnitude have more or less recently been proposed like LATOR, ASTROD, BepiColombo and GAIA. They involve the use of various spacecraft, to be launched along inte... |
2404.07056 | Luisa Boglioni | Gabriele Barca, Luisa Boglioni, Giovanni Montani | Quantum Isotropic Universe in RQM Analogy: the Cosmological Horizon | null | Physics of the Dark Universe 45 (2024) 101540 | 10.1016/j.dark.2024.101540 | null | gr-qc hep-th quant-ph | http://creativecommons.org/licenses/by/4.0/ | We investigate the quantum dynamics of the isotropic Universe in the presence
of a free massless scalar field, playing the role of a physical clock. The
Hilbert space is constructed via a direct analogy between the Wheeler-DeWitt
equation in the minisuperspace and a relativistic scalar one in physical space.
In parti... | [
{
"created": "Wed, 10 Apr 2024 14:45:56 GMT",
"version": "v1"
},
{
"created": "Fri, 12 Apr 2024 08:47:00 GMT",
"version": "v2"
},
{
"created": "Mon, 10 Jun 2024 15:52:20 GMT",
"version": "v3"
}
] | 2024-06-11 | [
[
"Barca",
"Gabriele",
""
],
[
"Boglioni",
"Luisa",
""
],
[
"Montani",
"Giovanni",
""
]
] | We investigate the quantum dynamics of the isotropic Universe in the presence of a free massless scalar field, playing the role of a physical clock. The Hilbert space is constructed via a direct analogy between the Wheeler-DeWitt equation in the minisuperspace and a relativistic scalar one in physical space. In particu... |
2208.12993 | Bayram Tekin | Emel Altas and Bayram Tekin | Hawking Temperature as the Total Gauss-Bonnet Invariant of the Region
Outside a Black Hole | 9 pages, 2 figure, extended version to appear in THE EUROPEAN
PHYSICAL JOURNAL C (Particles and Fields) | null | 10.1140/epjc/s10052-023-11594-9 | null | gr-qc hep-ph hep-th math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide two novel ways to compute the surface gravity ($\kappa$) and the
Hawking temperature $(T_{H})$ of a stationary black hole: in the first method
$T_{H}$ is given as the three-volume integral of the Gauss-Bonnet invariant (or
the Kretschmann scalar for Ricci-flat metrics) in the total region outside the
event... | [
{
"created": "Sat, 27 Aug 2022 12:06:23 GMT",
"version": "v1"
},
{
"created": "Sat, 6 May 2023 14:12:24 GMT",
"version": "v2"
}
] | 2023-05-31 | [
[
"Altas",
"Emel",
""
],
[
"Tekin",
"Bayram",
""
]
] | We provide two novel ways to compute the surface gravity ($\kappa$) and the Hawking temperature $(T_{H})$ of a stationary black hole: in the first method $T_{H}$ is given as the three-volume integral of the Gauss-Bonnet invariant (or the Kretschmann scalar for Ricci-flat metrics) in the total region outside the event h... |
1812.02117 | Jose M. Carmona | J.L. Alonso and J.M. Carmona | Before spacetime: A proposal of a framework for multiverse quantum
cosmology based on three cosmological conjectures | 7 pages, 2 figures. Final version accepted for publication in CQG | Class. Quantum Grav. 36, 185001 (2019) | 10.1088/1361-6382/ab3780 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The three cosmological conjectures to which our work refers are: the
phenomenon called geodesic incompleteness, the physical gravitational
$\theta_G$-term that would characterize the 1-parameter family of inequivalent
vacua of quantum gravidynamics, and the hypothesis of multiversality, more
specifically, a zero-ener... | [
{
"created": "Wed, 5 Dec 2018 17:14:14 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jul 2019 11:23:02 GMT",
"version": "v2"
}
] | 2020-03-24 | [
[
"Alonso",
"J. L.",
""
],
[
"Carmona",
"J. M.",
""
]
] | The three cosmological conjectures to which our work refers are: the phenomenon called geodesic incompleteness, the physical gravitational $\theta_G$-term that would characterize the 1-parameter family of inequivalent vacua of quantum gravidynamics, and the hypothesis of multiversality, more specifically, a zero-energy... |
1501.03556 | Xu Wei | Wei Xu, Jia Wang and Xin-he Meng | Entropy relations and the application of black holes with cosmological
constant and Gauss-Bonnet term | 12 pages, 0 figures, references added. Accepted for publication in
Physics Letters B | Physics Letters B 742 (2015) 225-230 | 10.1016/j.physletb.2015.01.018. | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Based on the entropy relations, we derive thermodynamic bound for entropy and
area of horizons of Schwarzschild-dS black hole, including the event horizon,
Cauchy horizon and negative horizon (i.e. the horizon with negative value),
which are all geometrical bound and made up of the cosmological radius.
Consider the f... | [
{
"created": "Thu, 15 Jan 2015 02:24:54 GMT",
"version": "v1"
},
{
"created": "Tue, 3 Feb 2015 13:37:45 GMT",
"version": "v2"
}
] | 2015-02-04 | [
[
"Xu",
"Wei",
""
],
[
"Wang",
"Jia",
""
],
[
"Meng",
"Xin-he",
""
]
] | Based on the entropy relations, we derive thermodynamic bound for entropy and area of horizons of Schwarzschild-dS black hole, including the event horizon, Cauchy horizon and negative horizon (i.e. the horizon with negative value), which are all geometrical bound and made up of the cosmological radius. Consider the fir... |
0803.0334 | David Brown | J. David Brown | Strongly Hyperbolic Extensions of the ADM Hamiltonian | This version contains minor corrections and clarifications. The
format has been changed to conform with IOP style | null | 10.1007/978-0-387-87499-9_6 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The ADM Hamiltonian formulation of general relativity with prescribed lapse
and shift is a weakly hyperbolic system of partial differential equations. In
general weakly hyperbolic systems are not mathematically well posed. For well
posedness, the theory should be reformulated so that the complete system,
evolution eq... | [
{
"created": "Mon, 3 Mar 2008 21:29:44 GMT",
"version": "v1"
},
{
"created": "Thu, 10 Jul 2008 19:01:01 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Brown",
"J. David",
""
]
] | The ADM Hamiltonian formulation of general relativity with prescribed lapse and shift is a weakly hyperbolic system of partial differential equations. In general weakly hyperbolic systems are not mathematically well posed. For well posedness, the theory should be reformulated so that the complete system, evolution equa... |
1610.07069 | Ali \"Ovg\"un | Kimet Jusufi and Ali \"Ovg\"un | Hawking radiation of scalar and vector particles from 5D Myers-Perry
black holes | 11 pages, Accepted for publication in International Journal of
Theoretical Physics | Int J Theor Phys (2017) 56: 1725 | 10.1007/s10773-017-3317-7 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the present paper we explore the Hawking radiation as a quantum tunneling
effect from a rotating 5 dimensional Myers-Perry black hole (5D-MPBH) with two
independent angular momentum components. First, we investigate the Hawking
temperature by considering the tunneling of massive scalar particles and spin-1
vector ... | [
{
"created": "Sat, 22 Oct 2016 16:08:45 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Feb 2017 10:49:37 GMT",
"version": "v2"
}
] | 2017-05-12 | [
[
"Jusufi",
"Kimet",
""
],
[
"Övgün",
"Ali",
""
]
] | In the present paper we explore the Hawking radiation as a quantum tunneling effect from a rotating 5 dimensional Myers-Perry black hole (5D-MPBH) with two independent angular momentum components. First, we investigate the Hawking temperature by considering the tunneling of massive scalar particles and spin-1 vector pa... |
1907.06332 | Qing-Hua Zhu | Zhe Chang and Qing-Hua Zhu | Redshift drift in uniformly accelerated reference frame | v1: 28 pages, 4 figures; v2: 29 pages, 4 figures. Published in
Chinese Physics C | Chinese Physics C, Vol. 44. No. 7 (2020) 075103 | 10.1088/1674-1137/44/7/075103 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We construct an alternative uniformly accelerated reference frame based on
the 3+1 formalism in adapted coordinates. In this frame, time-dependent
redshift drift exists between co-moving observers, which differs from that in
Rindler coordinates. This phenomenon can be tested in laboratory and improve
our understandin... | [
{
"created": "Mon, 15 Jul 2019 05:01:46 GMT",
"version": "v1"
},
{
"created": "Thu, 2 Jul 2020 03:58:46 GMT",
"version": "v2"
}
] | 2020-07-03 | [
[
"Chang",
"Zhe",
""
],
[
"Zhu",
"Qing-Hua",
""
]
] | We construct an alternative uniformly accelerated reference frame based on the 3+1 formalism in adapted coordinates. In this frame, time-dependent redshift drift exists between co-moving observers, which differs from that in Rindler coordinates. This phenomenon can be tested in laboratory and improve our understanding ... |
1005.0062 | Hossein Farajollahi | H.Farajollahi, N. Mohamadi, H. Amiri | Interacting Cosmic Fluids in Brans-Dicke Cosmology | 13 pages, 8 figures | Mod. Phys. Lett. A, 25, No. 30 (2010) 2579-2589 | 10.1142/S0217732310033499 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We provide a detailed description for power-law scaling FRW cosmological
models in Brans-Dicke theory dominated by two interacting fluid components
during the expansion of the universe.
| [
{
"created": "Sat, 1 May 2010 10:45:02 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jun 2011 07:14:05 GMT",
"version": "v2"
}
] | 2015-05-18 | [
[
"Farajollahi",
"H.",
""
],
[
"Mohamadi",
"N.",
""
],
[
"Amiri",
"H.",
""
]
] | We provide a detailed description for power-law scaling FRW cosmological models in Brans-Dicke theory dominated by two interacting fluid components during the expansion of the universe. |
1602.00106 | Madhavan Varadarajan | Madhavan Varadarajan | A Note on Entanglement Entropy, Coherent States and Gravity | 16 pages, no figures, 3 paragraphs added to last section in response
to referee comments, to appear as Editor's Choice Article in `General
Relativity and Gravitation' | null | 10.1007/s10714-016-2030-9 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The entanglement entropy of a free quantum field in a coherent state is
independent of its stress energy content. We use this result to highlight the
fact that while the Einstein equations for first order variations about a
locally maximally symmetric vacuum state of geometry and quantum fields seem to
follow from Ja... | [
{
"created": "Sat, 30 Jan 2016 11:36:08 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Feb 2016 05:07:20 GMT",
"version": "v2"
}
] | 2016-02-19 | [
[
"Varadarajan",
"Madhavan",
""
]
] | The entanglement entropy of a free quantum field in a coherent state is independent of its stress energy content. We use this result to highlight the fact that while the Einstein equations for first order variations about a locally maximally symmetric vacuum state of geometry and quantum fields seem to follow from Jaco... |
2301.10215 | Edward Wilson-Ewing | Ivan Agullo, Anzhong Wang, Edward Wilson-Ewing | Loop quantum cosmology: relation between theory and observations | 47 pages, 2 figures, to be published in Handbook of Quantum Gravity
(Eds. C. Bambi, L. Modesto and I.L. Shapiro, Springer, expected 2023) | null | 10.1007/978-981-19-3079-9_103-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | This chapter provides a review of the frameworks developed for cosmological
perturbation theory in loop quantum cosmology, and applications to various
models of the early universe including inflation, ekpyrosis and the matter
bounce, with an emphasis on potential observational consequences. It also
includes a discuss... | [
{
"created": "Tue, 24 Jan 2023 18:44:26 GMT",
"version": "v1"
}
] | 2024-03-08 | [
[
"Agullo",
"Ivan",
""
],
[
"Wang",
"Anzhong",
""
],
[
"Wilson-Ewing",
"Edward",
""
]
] | This chapter provides a review of the frameworks developed for cosmological perturbation theory in loop quantum cosmology, and applications to various models of the early universe including inflation, ekpyrosis and the matter bounce, with an emphasis on potential observational consequences. It also includes a discussio... |
gr-qc/0610122 | Gregory B. Cook | Alessandra Buonanno, Gregory B. Cook, Frans Pretorius | Inspiral, merger and ring-down of equal-mass black-hole binaries | 47 pages, 34 figures, full abstract in paper, revtex4, accepted by
PRD, miscellaneous revisions throughout paper | Phys.Rev.D75:124018,2007 | 10.1103/PhysRevD.75.124018 | null | gr-qc astro-ph | null | We investigate the dynamics and gravitational-wave (GW) emission in the
binary merger of equal-mass black holes as obtained from numerical relativity
simulations. Results from the evolution of three sets of initial data are
explored in detail, corresponding to different initial separations of the black
holes. We find... | [
{
"created": "Wed, 25 Oct 2006 18:27:10 GMT",
"version": "v1"
},
{
"created": "Fri, 22 Jun 2007 20:25:08 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Buonanno",
"Alessandra",
""
],
[
"Cook",
"Gregory B.",
""
],
[
"Pretorius",
"Frans",
""
]
] | We investigate the dynamics and gravitational-wave (GW) emission in the binary merger of equal-mass black holes as obtained from numerical relativity simulations. Results from the evolution of three sets of initial data are explored in detail, corresponding to different initial separations of the black holes. We find t... |
2008.12109 | Pujian Mao | Pujian Mao | Remarks on infinite towers of gravitational memories | v2: minor revision, several issues clarified, typos corrected, refs.
added | JHEP 11 (2020) 102 | 10.1007/JHEP11(2020)102 | CJQS-2020-034 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | An infinite tower of gravitational memories was proposed in
\cite{Compere:2019odm} by considering the matter-induced vacuum transition in
the impulsive limit. We give an alternative realization of the infinite towers
of gravitational memories in Newman-Penrose formalism. We also demonstrate that
the memories at each ... | [
{
"created": "Thu, 27 Aug 2020 13:35:09 GMT",
"version": "v1"
},
{
"created": "Sat, 21 Nov 2020 13:14:02 GMT",
"version": "v2"
}
] | 2020-11-24 | [
[
"Mao",
"Pujian",
""
]
] | An infinite tower of gravitational memories was proposed in \cite{Compere:2019odm} by considering the matter-induced vacuum transition in the impulsive limit. We give an alternative realization of the infinite towers of gravitational memories in Newman-Penrose formalism. We also demonstrate that the memories at each or... |
2106.02414 | Angela Borchers | Angela Borchers and Frank Ohme | Black-hole kicks: a tool to measure the accuracy of gravitational-wave
models | Contribution to the 2021 Gravitation session of the 55th Rencontres
de Moriond | null | null | null | gr-qc | http://creativecommons.org/licenses/by-nc-sa/4.0/ | Asymmetric binary systems radiate linear momentum through gravitational
waves, leading to the recoil of the merger remnant. Black-hole kicks have
attracted much attention because of their astrophysical implications. However,
little information can be extracted from the observations made by LIGO and
Virgo so far. In t... | [
{
"created": "Fri, 4 Jun 2021 11:14:50 GMT",
"version": "v1"
}
] | 2021-06-07 | [
[
"Borchers",
"Angela",
""
],
[
"Ohme",
"Frank",
""
]
] | Asymmetric binary systems radiate linear momentum through gravitational waves, leading to the recoil of the merger remnant. Black-hole kicks have attracted much attention because of their astrophysical implications. However, little information can be extracted from the observations made by LIGO and Virgo so far. In thi... |
2406.02621 | Puskar Mondal | Puskar Mondal, Shing-Tung Yau | A new conformal quasi-local energy in general relativity | comments welcome. arXiv admin note: text overlap with
arXiv:2401.13909 | null | null | null | gr-qc math-ph math.DG math.MP | http://creativecommons.org/licenses/by/4.0/ | We construct new conserved quasi-local energies in general relativity using
the formalism developed by \cite{CWY}. In particular, we use the optimal
isometric embedding defined in \cite{yau,yau1} to transplant the conformal
Killing fields of the Minkowski space back to the $ 2-$ surface of interest in
the physical sp... | [
{
"created": "Mon, 3 Jun 2024 19:11:12 GMT",
"version": "v1"
}
] | 2024-06-06 | [
[
"Mondal",
"Puskar",
""
],
[
"Yau",
"Shing-Tung",
""
]
] | We construct new conserved quasi-local energies in general relativity using the formalism developed by \cite{CWY}. In particular, we use the optimal isometric embedding defined in \cite{yau,yau1} to transplant the conformal Killing fields of the Minkowski space back to the $ 2-$ surface of interest in the physical spac... |
0806.4710 | Eugenio Bianchi | Eugenio Bianchi | The length operator in Loop Quantum Gravity | 33 pages, 12 figures; NPB version | Nucl.Phys.B807:591-624,2009 | 10.1016/j.nuclphysb.2008.08.013 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The dual picture of quantum geometry provided by a spin network state is
discussed. From this perspective, we introduce a new operator in Loop Quantum
Gravity - the length operator. We describe its quantum geometrical meaning and
derive some of its properties. In particular we show that the operator has a
discrete sp... | [
{
"created": "Sat, 28 Jun 2008 17:44:42 GMT",
"version": "v1"
},
{
"created": "Thu, 11 Sep 2008 13:24:29 GMT",
"version": "v2"
}
] | 2008-11-26 | [
[
"Bianchi",
"Eugenio",
""
]
] | The dual picture of quantum geometry provided by a spin network state is discussed. From this perspective, we introduce a new operator in Loop Quantum Gravity - the length operator. We describe its quantum geometrical meaning and derive some of its properties. In particular we show that the operator has a discrete spec... |
1108.3114 | Ting Hong | T. Hong, J. Miller, H. Yamamoto, Y. Chen, R. Adhikari | Effects of Mirror Aberrations on Laguerre-Gaussian Beams in
Interferometric Gravitational-Wave Detectors | 10 pages, 11 figures | null | 10.1103/PhysRevD.84.102001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | A fundamental limit to the sensitivity of optical interferometers is imposed
by Brownian thermal fluctuations of the mirrors' surfaces. This thermal noise
can be reduced by using larger beams which "average out" the random
fluctuations of the surfaces. It has been proposed previously that wider,
higher-order Laguerre... | [
{
"created": "Mon, 15 Aug 2011 22:54:51 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Aug 2011 22:37:46 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Oct 2011 22:55:35 GMT",
"version": "v3"
}
] | 2013-05-29 | [
[
"Hong",
"T.",
""
],
[
"Miller",
"J.",
""
],
[
"Yamamoto",
"H.",
""
],
[
"Chen",
"Y.",
""
],
[
"Adhikari",
"R.",
""
]
] | A fundamental limit to the sensitivity of optical interferometers is imposed by Brownian thermal fluctuations of the mirrors' surfaces. This thermal noise can be reduced by using larger beams which "average out" the random fluctuations of the surfaces. It has been proposed previously that wider, higher-order Laguerre-G... |
gr-qc/9907058 | Jerzy Lewandowski | Jerzy Lewandowski (Warsaw) | Space-Times Admitting Isolated Horizons | 11 pages, no figures | Class.Quant.Grav.17:L53-L59,2000 | 10.1088/0264-9381/17/4/101 | null | gr-qc astro-ph hep-th | null | We characterize a general solution to the vacuum Einstein equations which
admits isolated horizons. We show it is a non-linear superposition -- in
precise sense -- of the Schwarzschild metric with a certain free data set
propagating tangentially to the horizon. This proves Ashtekar's conjecture
about the structure of... | [
{
"created": "Mon, 19 Jul 1999 19:18:16 GMT",
"version": "v1"
},
{
"created": "Thu, 13 Jan 2000 14:47:02 GMT",
"version": "v2"
}
] | 2010-04-06 | [
[
"Lewandowski",
"Jerzy",
"",
"Warsaw"
]
] | We characterize a general solution to the vacuum Einstein equations which admits isolated horizons. We show it is a non-linear superposition -- in precise sense -- of the Schwarzschild metric with a certain free data set propagating tangentially to the horizon. This proves Ashtekar's conjecture about the structure of s... |
1512.04064 | Pisin Chen | Pisin Chen and Gerard Mourou | Accelerating Plasma Mirrors to Investigate Black Hole Information Loss
Paradox | 5 pages, 2 figures | Phys. Rev. Lett. 118, 045001 (2017) | 10.1103/PhysRevLett.118.045001 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The question of whether Hawking evaporation violates unitarity, and therefore
results in the loss of information, remains unresolved since Hawking's seminal
discovery. So far the investigations remain mostly theoretical since it is
almost impossible to settle this paradox through direct astrophysical black
hole obser... | [
{
"created": "Sun, 13 Dec 2015 15:15:26 GMT",
"version": "v1"
},
{
"created": "Wed, 23 Dec 2015 20:05:07 GMT",
"version": "v2"
},
{
"created": "Sun, 28 Feb 2016 08:42:28 GMT",
"version": "v3"
},
{
"created": "Fri, 22 Jul 2016 21:31:57 GMT",
"version": "v4"
},
{
"c... | 2017-02-01 | [
[
"Chen",
"Pisin",
""
],
[
"Mourou",
"Gerard",
""
]
] | The question of whether Hawking evaporation violates unitarity, and therefore results in the loss of information, remains unresolved since Hawking's seminal discovery. So far the investigations remain mostly theoretical since it is almost impossible to settle this paradox through direct astrophysical black hole observa... |
gr-qc/0609028 | Scott A. Hughes | Scott A. Hughes | A brief survey of LISA sources and science | 8 pages, 2 figures, for the Proceedings of the Sixth International
LISA Symposium. Particularly silly typo in one equation fixed | null | 10.1063/1.2405017 | null | gr-qc astro-ph | null | LISA is a planned space-based gravitational-wave (GW) detector that would be
sensitive to waves from low-frequency sources, in the band of roughly $(0.03 -
0.1) {\rm mHz} \lesssim f \lesssim 0.1 {\rm Hz}$. This is expected to be an
extremely rich chunk of the GW spectrum -- observing these waves will provide a
unique... | [
{
"created": "Thu, 7 Sep 2006 18:19:05 GMT",
"version": "v1"
},
{
"created": "Sun, 10 Sep 2006 01:28:01 GMT",
"version": "v2"
}
] | 2009-11-11 | [
[
"Hughes",
"Scott A.",
""
]
] | LISA is a planned space-based gravitational-wave (GW) detector that would be sensitive to waves from low-frequency sources, in the band of roughly $(0.03 - 0.1) {\rm mHz} \lesssim f \lesssim 0.1 {\rm Hz}$. This is expected to be an extremely rich chunk of the GW spectrum -- observing these waves will provide a unique v... |
0905.3120 | Chris Pankow | C. Pankow, S. Klimenko, G. Mitselmakher, I. Yakushin, G. Vedovato, M.
Drago, R. A. Mercer and P. Ajith | A burst search for gravitational waves from binary black holes | 12 pages, 4 figures, 2 tables, submitted for publication in CQG in
the special issue for the conference proceedings of GWDAW13; corrected some
typos, addressed some minor reviewer comments one section restructured and
references updated and corrected | null | 10.1088/0264-9381/26/20/204004 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Compact binary coalescence (CBC) is one of the most promising sources of
gravitational waves. These sources are usually searched for with matched
filters which require accurate calculation of the GW waveforms and generation
of large template banks. We present a complementary search technique based on
algorithms used ... | [
{
"created": "Tue, 19 May 2009 14:57:06 GMT",
"version": "v1"
},
{
"created": "Fri, 14 Aug 2009 15:10:33 GMT",
"version": "v2"
}
] | 2015-05-13 | [
[
"Pankow",
"C.",
""
],
[
"Klimenko",
"S.",
""
],
[
"Mitselmakher",
"G.",
""
],
[
"Yakushin",
"I.",
""
],
[
"Vedovato",
"G.",
""
],
[
"Drago",
"M.",
""
],
[
"Mercer",
"R. A.",
""
],
[
"Ajith",
"P.... | Compact binary coalescence (CBC) is one of the most promising sources of gravitational waves. These sources are usually searched for with matched filters which require accurate calculation of the GW waveforms and generation of large template banks. We present a complementary search technique based on algorithms used in... |
0910.5659 | Jaakko Vainio | Tuomas Multam\"aki, Jaakko Vainio, Iiro Vilja | Hamiltonian perturbation theory in f(R) gravity | 16 pages | Phys.Rev.D81:064025,2010 | 10.1103/PhysRevD.81.064025 | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Hamiltonian perturbation theory is used to analyse the stability of f(R)
models. The Hamiltonian equations for the metric and its momentum conjugate are
written for f(R) Lagrangian in the presence of perfect fluid matter. The
perturbations examined are perpendicular to R. As perturbations are added to
the metric and ... | [
{
"created": "Thu, 29 Oct 2009 15:07:13 GMT",
"version": "v1"
}
] | 2010-04-29 | [
[
"Multamäki",
"Tuomas",
""
],
[
"Vainio",
"Jaakko",
""
],
[
"Vilja",
"Iiro",
""
]
] | Hamiltonian perturbation theory is used to analyse the stability of f(R) models. The Hamiltonian equations for the metric and its momentum conjugate are written for f(R) Lagrangian in the presence of perfect fluid matter. The perturbations examined are perpendicular to R. As perturbations are added to the metric and mo... |
1805.07818 | Kalin Staykov | Kalin V. Staykov, Dimitar Popchev, Daniela D. Doneva, Stoytcho S.
Yazadjiev | Static and slowly rotating neutron stars in scalar-tensor theory with
self-interacting massive scalar field | 9 pages, 5 figures | null | 10.1140/epjc/s10052-018-6064-x | null | gr-qc astro-ph.HE | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Binary pulsar observations and gravitational wave detections seriously
constrained scalar-tensor theories with massless scalar field allowing only
small deviations from general relativity. If we consider a nonzero mass of the
scalar field, though, significant deviations from general relativity are
allowed for values ... | [
{
"created": "Sun, 20 May 2018 19:59:57 GMT",
"version": "v1"
}
] | 2018-08-15 | [
[
"Staykov",
"Kalin V.",
""
],
[
"Popchev",
"Dimitar",
""
],
[
"Doneva",
"Daniela D.",
""
],
[
"Yazadjiev",
"Stoytcho S.",
""
]
] | Binary pulsar observations and gravitational wave detections seriously constrained scalar-tensor theories with massless scalar field allowing only small deviations from general relativity. If we consider a nonzero mass of the scalar field, though, significant deviations from general relativity are allowed for values of... |
2211.10456 | Alejandro Aguilar-Nieto | Alejandro Aguilar-Nieto, V\'ictor Jaramillo, Juan Barranco, Argelia
Bernal, Juan Carlos Degollado, Dar\'io N\'u\~nez | Self-interacting scalar field distributions around Schwarzschild black
holes | 14 pages, 13 figures | null | 10.1103/PhysRevD.107.044070 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Long-lived configurations of massive scalar fields around black holes may
form if the coupling between the mass of the scalar field and the mass of the
black hole is very small. In this work we analyze the effect of
self-interaction in the distribution of the long-lived cloud surrounding a
static black hole. We consi... | [
{
"created": "Fri, 18 Nov 2022 19:00:08 GMT",
"version": "v1"
}
] | 2023-03-08 | [
[
"Aguilar-Nieto",
"Alejandro",
""
],
[
"Jaramillo",
"Víctor",
""
],
[
"Barranco",
"Juan",
""
],
[
"Bernal",
"Argelia",
""
],
[
"Degollado",
"Juan Carlos",
""
],
[
"Núñez",
"Darío",
""
]
] | Long-lived configurations of massive scalar fields around black holes may form if the coupling between the mass of the scalar field and the mass of the black hole is very small. In this work we analyze the effect of self-interaction in the distribution of the long-lived cloud surrounding a static black hole. We conside... |
2212.04600 | Matthew Digman | Matthew C. Digman, Neil J. Cornish | Parameter Estimation for Stellar-Origin Black Hole Mergers In LISA | 13 pages, 6 figures, 1 table | null | 10.1103/PhysRevD.108.023022 | null | gr-qc astro-ph.HE astro-ph.IM | http://creativecommons.org/licenses/by-nc-sa/4.0/ | The population of stellar origin black hole binaries (SOBHBs) detected by
existing ground-based gravitational wave detectors is an exciting target for
the future space-based Laser Interferometer Space Antenna (LISA). LISA is
sensitive to signals at significantly lower frequencies than ground-based
detectors. SOBHB si... | [
{
"created": "Thu, 8 Dec 2022 23:17:02 GMT",
"version": "v1"
}
] | 2023-08-09 | [
[
"Digman",
"Matthew C.",
""
],
[
"Cornish",
"Neil J.",
""
]
] | The population of stellar origin black hole binaries (SOBHBs) detected by existing ground-based gravitational wave detectors is an exciting target for the future space-based Laser Interferometer Space Antenna (LISA). LISA is sensitive to signals at significantly lower frequencies than ground-based detectors. SOBHB sign... |
2302.02433 | Gholam Hossein Bordbar | H. Barzegar, M. Bigdeli, G. H. Bordbar, and B. Eslam Panah | Stable three-dimensional (un)charged AdS gravastars in gravity's rainbow | 21 pages, 17 figures | European Physical Journal C 83 (2023) 151 | 10.1140/epjc/s10052-023-11295-3 | null | gr-qc astro-ph.HE astro-ph.SR hep-th | http://creativecommons.org/licenses/by-nc-nd/4.0/ | In this work, we study the three-dimensional AdS gravitational vacuum stars
(gravastars) in the context of gravity's rainbow theory. Then we extend it by
adding the Maxwell electromagnetic field. We compute the physical features of
gravastars, such as proper length, energy, entropy, and junction conditions.
Our resul... | [
{
"created": "Sun, 5 Feb 2023 17:08:14 GMT",
"version": "v1"
},
{
"created": "Thu, 16 Feb 2023 09:45:58 GMT",
"version": "v2"
}
] | 2023-02-17 | [
[
"Barzegar",
"H.",
""
],
[
"Bigdeli",
"M.",
""
],
[
"Bordbar",
"G. H.",
""
],
[
"Panah",
"B. Eslam",
""
]
] | In this work, we study the three-dimensional AdS gravitational vacuum stars (gravastars) in the context of gravity's rainbow theory. Then we extend it by adding the Maxwell electromagnetic field. We compute the physical features of gravastars, such as proper length, energy, entropy, and junction conditions. Our results... |
1506.04685 | Mauricio Cataldo MC | Mauricio Cataldo, Luis Liempi, Pablo Rodriguez | Morris-Thorne wormholes in static pseudo-spherically symmetric
spacetimes | 12 pages, 5 figures | Phys. Rev. D 91, 124039 (2015) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this paper we study classical general relativistic static wormhole
configurations with pseudo-spherical symmetry. We show that in addition to the
hyperbolic wormhole solutions discussed by Lobo and Mimoso in the Ref. Phys.\
Rev.\ D {\bf 82}, 044034 (2010), there exists another wormhole class, which is
truly pseudo... | [
{
"created": "Mon, 15 Jun 2015 18:01:00 GMT",
"version": "v1"
},
{
"created": "Thu, 25 Jun 2015 19:02:57 GMT",
"version": "v2"
}
] | 2015-06-26 | [
[
"Cataldo",
"Mauricio",
""
],
[
"Liempi",
"Luis",
""
],
[
"Rodriguez",
"Pablo",
""
]
] | In this paper we study classical general relativistic static wormhole configurations with pseudo-spherical symmetry. We show that in addition to the hyperbolic wormhole solutions discussed by Lobo and Mimoso in the Ref. Phys.\ Rev.\ D {\bf 82}, 044034 (2010), there exists another wormhole class, which is truly pseudo-s... |
gr-qc/0412084 | Marc Lachieze-Rey | Michel Mizony (IGD), Marc Lachieze-Rey (PGC) | Cosmological effects in the local static frame | to appear in Astron. & Astroph | Astron.Astrophys.434:45-52,2005 | 10.1051/0004-6361:20042195 | null | gr-qc astro-ph hep-th | null | What is the influence of cosmology (the expansion law and its acceleration,
the cosmological constant...) on the dynamics and optics of a local system like
the solar system, a galaxy, a cluster, a supercluster...? The answer requires
the solution of Einstein equation with the local source, which tends towards
the cos... | [
{
"created": "Fri, 17 Dec 2004 13:50:00 GMT",
"version": "v1"
}
] | 2008-11-26 | [
[
"Mizony",
"Michel",
"",
"IGD"
],
[
"Lachieze-Rey",
"Marc",
"",
"PGC"
]
] | What is the influence of cosmology (the expansion law and its acceleration, the cosmological constant...) on the dynamics and optics of a local system like the solar system, a galaxy, a cluster, a supercluster...? The answer requires the solution of Einstein equation with the local source, which tends towards the cosmo... |
0705.2254 | Alexander Zhidenko | Alexander Zhidenko | Quasi-normal modes for black hole solutions unknown in analytical form | 3 pages, 1 figure, RevTeX. Talk to be given at the seminar of Russian
Gravitational Society | null | null | null | gr-qc | null | We review the papers [1-3]. We discuss possibilities of studying the
quasi-normal modes of black holes that are not known in an analytical form.
Such black holes appear as solutions in various theoretical models and real
astrophysical approximations when one takes into account the black hole
neighborhood.
| [
{
"created": "Tue, 15 May 2007 22:51:09 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Zhidenko",
"Alexander",
""
]
] | We review the papers [1-3]. We discuss possibilities of studying the quasi-normal modes of black holes that are not known in an analytical form. Such black holes appear as solutions in various theoretical models and real astrophysical approximations when one takes into account the black hole neighborhood. |
1201.3164 | Chopin Soo | Chopin Soo and Hoi-Lai Yu | General Relativity without paradigm of space-time covariance, and
resolution of the problem of time | 11 pages | Prog Theor Exp Phys (2014) | 10.1142/9789814449373_0006 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The framework of a theory of gravity from the quantum to the classical regime
is presented. The paradigm shift from full spacetime covariance to spatial
diffeomorphism invariance, together with clean decomposition of the canonical
structure, yield transparent physical dynamics and a resolution of the problem
of time.... | [
{
"created": "Mon, 16 Jan 2012 07:07:34 GMT",
"version": "v1"
},
{
"created": "Tue, 10 Jul 2012 11:03:29 GMT",
"version": "v2"
},
{
"created": "Sun, 18 Nov 2012 10:28:17 GMT",
"version": "v3"
},
{
"created": "Fri, 5 Jul 2013 13:41:57 GMT",
"version": "v4"
},
{
"cr... | 2019-12-06 | [
[
"Soo",
"Chopin",
""
],
[
"Yu",
"Hoi-Lai",
""
]
] | The framework of a theory of gravity from the quantum to the classical regime is presented. The paradigm shift from full spacetime covariance to spatial diffeomorphism invariance, together with clean decomposition of the canonical structure, yield transparent physical dynamics and a resolution of the problem of time. T... |
gr-qc/0210085 | Mark Goodsell | Mark D. Goodsell, Carl E. Dolby, Stephen F. Gull | A Dirac Sea for a General Non-Inertial Observer In Flat 1+1 Dimensional
Spacetime | 26 pages, 3 figures, submitted to Annals of Physics | null | null | AOP 65052 | gr-qc | null | A coordinate system is set up for a general accelerating observer and is used
to determine the particle content of the Dirac vacuum for that observer.
Equations are obtained for the spatial distribution and total number of
particles for massless fermions as seen by this observer, generalising previous
work.
| [
{
"created": "Thu, 24 Oct 2002 16:54:16 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Goodsell",
"Mark D.",
""
],
[
"Dolby",
"Carl E.",
""
],
[
"Gull",
"Stephen F.",
""
]
] | A coordinate system is set up for a general accelerating observer and is used to determine the particle content of the Dirac vacuum for that observer. Equations are obtained for the spatial distribution and total number of particles for massless fermions as seen by this observer, generalising previous work. |
1003.5652 | Florian Conrady | Florian Conrady (Perimeter Inst. Theor. Phys.) | Spin foams with timelike surfaces | 22 pages, no figures; v2: remarks on operator formalism added in
discussion; correction: the spin 1/2 irrep of the discrete series does not
appear in the Plancherel decomposition | Class. Quant. Grav.27:155014, 2010 | 10.1088/0264-9381/27/15/155014 | PI-QG-179 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Spin foams of 4d gravity were recently extended from complexes with purely
spacelike surfaces to complexes that also contain timelike surfaces. In this
article, we express the associated partition function in terms of vertex
amplitudes and integrals over coherent states. The coherent states are
characterized by unit ... | [
{
"created": "Mon, 29 Mar 2010 19:46:04 GMT",
"version": "v1"
},
{
"created": "Fri, 2 Apr 2010 19:43:06 GMT",
"version": "v2"
}
] | 2011-01-19 | [
[
"Conrady",
"Florian",
"",
"Perimeter Inst. Theor. Phys."
]
] | Spin foams of 4d gravity were recently extended from complexes with purely spacelike surfaces to complexes that also contain timelike surfaces. In this article, we express the associated partition function in terms of vertex amplitudes and integrals over coherent states. The coherent states are characterized by unit 3-... |
1505.03070 | Elsayed Lashin Dr. | E. I. Lashin | On the correctness of cosmology from quantum potential | 7 pages (just the same as v1 but the height of pages are altered to
make page numbers visible) | Mod. Phys. Lett. A, Vol. 31, No. 7 (2016) 1650044 | 10.1142/S0217732316500449 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We examine in detail the cosmology based on quantal (Bohmian) trajectories as
suggested in a recent study arXiv:1404.3093[gr-qc]. We disagree with the
conclusions regarding predicting the value of the cosmological constant
$\Lambda$ and evading the big bang singularity. Furthermore, we show that the
approach of using... | [
{
"created": "Tue, 12 May 2015 15:47:25 GMT",
"version": "v1"
},
{
"created": "Thu, 14 May 2015 12:41:35 GMT",
"version": "v2"
}
] | 2016-03-15 | [
[
"Lashin",
"E. I.",
""
]
] | We examine in detail the cosmology based on quantal (Bohmian) trajectories as suggested in a recent study arXiv:1404.3093[gr-qc]. We disagree with the conclusions regarding predicting the value of the cosmological constant $\Lambda$ and evading the big bang singularity. Furthermore, we show that the approach of using a... |
1211.6632 | Thomas W. Baumgarte | Thomas W. Baumgarte, Pedro J. Montero, Isabel Cordero-Carri\'on, Ewald
M\"uller | Numerical Relativity in Spherical Polar Coordinates: Evolution
Calculations with the BSSN Formulation | 14 pages, 10 figures, submitted to PRD | null | 10.1103/PhysRevD.87.044026 | null | gr-qc astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In the absence of symmetry assumptions most numerical relativity simulations
adopt Cartesian coordinates. While Cartesian coordinates have some desirable
properties, spherical polar coordinates appear better suited for certain
applications, including gravitational collapse and supernova simulations.
Development of nu... | [
{
"created": "Wed, 28 Nov 2012 15:23:04 GMT",
"version": "v1"
}
] | 2015-06-12 | [
[
"Baumgarte",
"Thomas W.",
""
],
[
"Montero",
"Pedro J.",
""
],
[
"Cordero-Carrión",
"Isabel",
""
],
[
"Müller",
"Ewald",
""
]
] | In the absence of symmetry assumptions most numerical relativity simulations adopt Cartesian coordinates. While Cartesian coordinates have some desirable properties, spherical polar coordinates appear better suited for certain applications, including gravitational collapse and supernova simulations. Development of nume... |
1007.2725 | Sumati Surya | Fay Dowker, Steven Johnston, Sumati Surya | On extending the Quantum Measure | 23 pages, 2 figures | J.Phys.A43:505305,2010 | 10.1088/1751-8113/43/50/505305 | null | gr-qc math-ph math.MP quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We point out that a quantum system with a strongly positive quantum measure
or decoherence functional gives rise to a vector valued measure whose domain is
the algebra of events or physical questions. This gives an immediate handle on
the question of the extension of the decoherence functional to the sigma
algebra ge... | [
{
"created": "Fri, 16 Jul 2010 09:44:11 GMT",
"version": "v1"
}
] | 2010-11-30 | [
[
"Dowker",
"Fay",
""
],
[
"Johnston",
"Steven",
""
],
[
"Surya",
"Sumati",
""
]
] | We point out that a quantum system with a strongly positive quantum measure or decoherence functional gives rise to a vector valued measure whose domain is the algebra of events or physical questions. This gives an immediate handle on the question of the extension of the decoherence functional to the sigma algebra gene... |
1603.07748 | Parthapratim Pradhan | Parthapratim Pradhan | Thermodynamic Products in Extended Phase Space | Accepted in IJMPD | International Journal of Modern Physics D, Vol. 26 (2017) 1750010
(16 pages) | 10.1142/S0218271817500109 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We have examined the thermodynamic properties for a variety of spherically
symmetric charged-AdS black hole (BH) solutions, including the charged AdS BH
surrounded by quintessence dark energy and charged AdS BH in $f(R)$ gravity in
\emph{extended phase-space}. This framework involves treating the cosmological
constan... | [
{
"created": "Thu, 24 Mar 2016 20:45:47 GMT",
"version": "v1"
},
{
"created": "Mon, 20 Jun 2016 06:19:17 GMT",
"version": "v2"
}
] | 2016-08-02 | [
[
"Pradhan",
"Parthapratim",
""
]
] | We have examined the thermodynamic properties for a variety of spherically symmetric charged-AdS black hole (BH) solutions, including the charged AdS BH surrounded by quintessence dark energy and charged AdS BH in $f(R)$ gravity in \emph{extended phase-space}. This framework involves treating the cosmological constant ... |
2201.08415 | Zheng-Wen Long | S. R. Wu, B. Q. Wang, Dong Liu, Z. W. Long | Echoes of charged black-bounce spacetimes | null | null | 10.1140/epjc/s10052-022-10938-1 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In present work, the evolution of scalar field and electromagnetic field
under the background of the charged black-bounce spacetimes are investigated,
and we obtain an obvious echoes signal which appropriately reports the
properties of the charged black-bounce spacetimes and disclose the physical
reasons behind such ... | [
{
"created": "Wed, 19 Jan 2022 00:59:41 GMT",
"version": "v1"
},
{
"created": "Sun, 30 Jan 2022 16:30:32 GMT",
"version": "v2"
},
{
"created": "Tue, 5 Jul 2022 21:23:18 GMT",
"version": "v3"
}
] | 2022-11-23 | [
[
"Wu",
"S. R.",
""
],
[
"Wang",
"B. Q.",
""
],
[
"Liu",
"Dong",
""
],
[
"Long",
"Z. W.",
""
]
] | In present work, the evolution of scalar field and electromagnetic field under the background of the charged black-bounce spacetimes are investigated, and we obtain an obvious echoes signal which appropriately reports the properties of the charged black-bounce spacetimes and disclose the physical reasons behind such ph... |
gr-qc/0003042 | Masafumi Seriu | Masafumi Seriu | Spectral Evolution of the Universe | To appear in Phys. Rev. D | Phys.Rev. D62 (2000) 023516 | 10.1103/PhysRevD.62.023516 | null | gr-qc | null | We derive the evolution equations for the spectra of the Universe.
Here "spectra" means the eigenvalues of the Laplacian defined on a space,
which contain the geometrical information on the space.
These equations are expected to be useful to analyze the evolution of the
geometrical structures of the Universe.
A... | [
{
"created": "Fri, 10 Mar 2000 01:37:10 GMT",
"version": "v1"
},
{
"created": "Mon, 13 Mar 2000 17:53:14 GMT",
"version": "v2"
}
] | 2009-10-31 | [
[
"Seriu",
"Masafumi",
""
]
] | We derive the evolution equations for the spectra of the Universe. Here "spectra" means the eigenvalues of the Laplacian defined on a space, which contain the geometrical information on the space. These equations are expected to be useful to analyze the evolution of the geometrical structures of the Universe. As an app... |
1712.04362 | Wei Zhang | Wei Zhang and Xiao-Mei Kuang | The quantum effect on Friedmann equation in FRW universe | 10 pages | AHEP 6758078(2018) | 10.1155/2018/6758078 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study the modified Friedmann equation in the Friedmann-Robertson-Walker
universe with quantum effect. Our modified results mainly stem from the new
entropy-area relation and the novel idea of T. Padmanabhan, who considers the
cosmic space to be emerged from the cosmic time progresses, so that the
expansion rate of... | [
{
"created": "Tue, 12 Dec 2017 15:54:38 GMT",
"version": "v1"
}
] | 2018-03-15 | [
[
"Zhang",
"Wei",
""
],
[
"Kuang",
"Xiao-Mei",
""
]
] | We study the modified Friedmann equation in the Friedmann-Robertson-Walker universe with quantum effect. Our modified results mainly stem from the new entropy-area relation and the novel idea of T. Padmanabhan, who considers the cosmic space to be emerged from the cosmic time progresses, so that the expansion rate of t... |
0910.4559 | J. -F. Pascual-Sanchez | A. San Miguel, F. Vicente and J.-F. Pascual-Sanchez | Numerical estimation of the curvature of a light wavefront in a weak
gravitational field | 22 pages, 6 figs, accepted in Classical and Quantum Gravity | Class.Quant.Grav.26:235004,2009 | 10.1088/0264-9381/26/23/235004 | null | gr-qc astro-ph.IM astro-ph.SR | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The geometry of a light wavefront evolving in the 3--space associated with a
post-Newtonian relativistic spacetime from a flat wavefront is studied
numerically by means of the ray tracing method. For a discretization of the
bidimensional wavefront the surface fitting technique is used to determine the
curvature of th... | [
{
"created": "Fri, 23 Oct 2009 18:08:32 GMT",
"version": "v1"
}
] | 2010-02-26 | [
[
"Miguel",
"A. San",
""
],
[
"Vicente",
"F.",
""
],
[
"Pascual-Sanchez",
"J. -F.",
""
]
] | The geometry of a light wavefront evolving in the 3--space associated with a post-Newtonian relativistic spacetime from a flat wavefront is studied numerically by means of the ray tracing method. For a discretization of the bidimensional wavefront the surface fitting technique is used to determine the curvature of this... |
1402.0690 | Julien Cortier | Julien Cortier and Vincent Minerbe | On complete stationary vacuum initial data | 11 pages | null | null | null | gr-qc math.DG | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We describe a proof of M.T. Anderson's result on the rigidity of complete
stationary initial data for the Einstein vacuum equations in spacetime
dimension 3 + 1, under an extra assumption on the norm of the stationary
Killing vector field. The argument only involves basic comparison geometry
along with some Bochner-W... | [
{
"created": "Tue, 4 Feb 2014 11:03:59 GMT",
"version": "v1"
}
] | 2014-02-05 | [
[
"Cortier",
"Julien",
""
],
[
"Minerbe",
"Vincent",
""
]
] | We describe a proof of M.T. Anderson's result on the rigidity of complete stationary initial data for the Einstein vacuum equations in spacetime dimension 3 + 1, under an extra assumption on the norm of the stationary Killing vector field. The argument only involves basic comparison geometry along with some Bochner-Wei... |
2205.13548 | Marco Astorino | Marco Astorino, Riccardo Martelli, Adriano Vigan\`o | Black holes in a swirling universe | v4: 22 pages, 11 figures, updated pictures about geodesic motion | Phys. Rev. D 106, 064014 (2022) | 10.1103/PhysRevD.106.064014 | IFUM-1093-FT | gr-qc astro-ph.HE hep-th | http://creativecommons.org/licenses/by-nc-sa/4.0/ | We present a new solution in Einstein's General Relativity representing a
Schwarzschild black hole immersed in a rotating universe. Such a solution is
constructed analytically by means of the last unexplored Lie point symmetry of
the Ernst equations for stationary and axisymmetric spacetimes. This kind of
the Ehlers ... | [
{
"created": "Thu, 26 May 2022 18:00:00 GMT",
"version": "v1"
},
{
"created": "Mon, 12 Sep 2022 21:39:50 GMT",
"version": "v2"
},
{
"created": "Sat, 26 Nov 2022 17:18:57 GMT",
"version": "v3"
},
{
"created": "Wed, 7 Feb 2024 18:00:37 GMT",
"version": "v4"
}
] | 2024-02-08 | [
[
"Astorino",
"Marco",
""
],
[
"Martelli",
"Riccardo",
""
],
[
"Viganò",
"Adriano",
""
]
] | We present a new solution in Einstein's General Relativity representing a Schwarzschild black hole immersed in a rotating universe. Such a solution is constructed analytically by means of the last unexplored Lie point symmetry of the Ernst equations for stationary and axisymmetric spacetimes. This kind of the Ehlers tr... |
1010.5200 | Laura Cadonati | Sebastian Fischetti, James Healy, Laura Cadonati, Lionel London,
Satyanarayan R.P. Mohapatra, Deirdre Shoemaker | Exploring the Use of Numerical Relativity Waveforms in Burst Analysis of
Precessing Black Hole Mergers | 9 pages, 15 figures | Phys.Rev.D83:044019,2011 | 10.1103/PhysRevD.83.044019 | LIGO Document Control Center P1000092 | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recent years have witnessed tremendous progress in numerical relativity and
an ever improving performance of ground-based interferometric gravitational
wave detectors. In preparation for Advanced LIGO and a new era in gravitational
wave astronomy, the numerical relativity and gravitational wave data analysis
communit... | [
{
"created": "Mon, 25 Oct 2010 17:29:01 GMT",
"version": "v1"
}
] | 2011-02-18 | [
[
"Fischetti",
"Sebastian",
""
],
[
"Healy",
"James",
""
],
[
"Cadonati",
"Laura",
""
],
[
"London",
"Lionel",
""
],
[
"Mohapatra",
"Satyanarayan R. P.",
""
],
[
"Shoemaker",
"Deirdre",
""
]
] | Recent years have witnessed tremendous progress in numerical relativity and an ever improving performance of ground-based interferometric gravitational wave detectors. In preparation for Advanced LIGO and a new era in gravitational wave astronomy, the numerical relativity and gravitational wave data analysis communitie... |
2405.08241 | Ruibo Wang | Rui-Bo Wang, Shi-Jie Ma, Lei You, Yu-Cheng Tang, Yu-Hang Feng, Xian-Ru
Hu and Jian-Bo Deng | Thermodynamics of AdS-Schwarzschild-like black hole in loop quantum
gravity | 35 pages, 8 figures, 1 table | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We obtained the metric of Schwarzschild-like black hole with LQG correction
in anti-de Sitter (AdS) space-time under the assumption that cosmological
constant is decoupled in loop quantum gravity (LQG), and investigated its
thermodynamics, including equation of state, criticality, heat capacity and
Gibbs free energy.... | [
{
"created": "Mon, 13 May 2024 23:51:07 GMT",
"version": "v1"
},
{
"created": "Sat, 15 Jun 2024 04:40:45 GMT",
"version": "v2"
}
] | 2024-06-18 | [
[
"Wang",
"Rui-Bo",
""
],
[
"Ma",
"Shi-Jie",
""
],
[
"You",
"Lei",
""
],
[
"Tang",
"Yu-Cheng",
""
],
[
"Feng",
"Yu-Hang",
""
],
[
"Hu",
"Xian-Ru",
""
],
[
"Deng",
"Jian-Bo",
""
]
] | We obtained the metric of Schwarzschild-like black hole with LQG correction in anti-de Sitter (AdS) space-time under the assumption that cosmological constant is decoupled in loop quantum gravity (LQG), and investigated its thermodynamics, including equation of state, criticality, heat capacity and Gibbs free energy. $... |
1908.04266 | Hossein Mohseni Sadjadi | H. Mohseni Sadjadi, V. Anari | End of the constant-roll inflation, and the reheating temperature | 23 pages, 14 figures, accepted for publication in "Physics of the
Dark Universe" | Physics of the Dark Universe 27 (2020) 100474 | 10.1016/j.dark.2020.100474 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | By extending the potential, we propose a mechanism for the end of the
constant-roll inflation and the subsequent reheating phase in the FLRW
space-time. Based on astrophysical data, we estimate the Universe reheating
temperature.
| [
{
"created": "Tue, 6 Aug 2019 11:27:10 GMT",
"version": "v1"
},
{
"created": "Thu, 19 Dec 2019 06:48:39 GMT",
"version": "v2"
},
{
"created": "Tue, 14 Jan 2020 14:02:16 GMT",
"version": "v3"
}
] | 2020-01-22 | [
[
"Sadjadi",
"H. Mohseni",
""
],
[
"Anari",
"V.",
""
]
] | By extending the potential, we propose a mechanism for the end of the constant-roll inflation and the subsequent reheating phase in the FLRW space-time. Based on astrophysical data, we estimate the Universe reheating temperature. |
0912.3992 | Sandro Micheletti | Sandro M. R. Micheletti | Observational constraints on holographic tachyonic dark energy in
interaction with dark matter | 14 pages, 5 figures | JCAP 1005:009,2010 | 10.1088/1475-7516/2010/05/009 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss an interacting tachyonic dark energy model in the context of the
holographic principle. The potential of the holographic tachyon field in
interaction with dark matter is constructed. The model results are compared
with CMB shift parameter, baryonic acoustic oscilations, lookback time and the
Constitution s... | [
{
"created": "Sun, 20 Dec 2009 08:30:48 GMT",
"version": "v1"
},
{
"created": "Wed, 30 Dec 2009 07:05:41 GMT",
"version": "v2"
},
{
"created": "Thu, 13 May 2010 03:36:51 GMT",
"version": "v3"
}
] | 2010-05-25 | [
[
"Micheletti",
"Sandro M. R.",
""
]
] | We discuss an interacting tachyonic dark energy model in the context of the holographic principle. The potential of the holographic tachyon field in interaction with dark matter is constructed. The model results are compared with CMB shift parameter, baryonic acoustic oscilations, lookback time and the Constitution sup... |
2311.11764 | Ding-Fang Zeng | Ding-fang Zeng | Microscopic State of BHs and an Exact One Body Method for Binary
Dynamics in General Relativity | 32 pages, 22 figures, comparison with observational data added,
expression and grammar revision | Eur. Phys. J. C 84, 370 (2024) | 10.1140/epjc/s10052-024-12683-z | null | gr-qc hep-th | http://creativecommons.org/licenses/by/4.0/ | In gravitational collapses, the horizon and singularity's realisation in the
finite future of the proper time used co-moving observer happens in the future
of infinitely far away future of the normal time used outside probe. To the
latter the horizon and singularity of a black hole formed through gravitational
collap... | [
{
"created": "Mon, 20 Nov 2023 13:46:49 GMT",
"version": "v1"
},
{
"created": "Mon, 11 Dec 2023 13:06:46 GMT",
"version": "v2"
}
] | 2024-04-10 | [
[
"Zeng",
"Ding-fang",
""
]
] | In gravitational collapses, the horizon and singularity's realisation in the finite future of the proper time used co-moving observer happens in the future of infinitely far away future of the normal time used outside probe. To the latter the horizon and singularity of a black hole formed through gravitational collapse... |
2210.13185 | Ying Wang | Xin Wu, Ying Wang, Wei Sun, Fu-Yao Liu, Wen-Biao Han | Explicit symplectic methods in black hole spacetimes | 16pages,accepted by Astrophysical Journal | null | 10.3847/1538-4357/ac9c5d | null | gr-qc nlin.CD physics.comp-ph | http://creativecommons.org/licenses/by/4.0/ | Many Hamiltonian problems in the Solar System are separable or separate into
two analytically solvable parts, and thus give a great chance to the
development and application of explicit symplectic integrators based on
operator splitting and composing. However, such constructions cannot in general
be available for cur... | [
{
"created": "Fri, 21 Oct 2022 02:26:45 GMT",
"version": "v1"
}
] | 2022-12-07 | [
[
"Wu",
"Xin",
""
],
[
"Wang",
"Ying",
""
],
[
"Sun",
"Wei",
""
],
[
"Liu",
"Fu-Yao",
""
],
[
"Han",
"Wen-Biao",
""
]
] | Many Hamiltonian problems in the Solar System are separable or separate into two analytically solvable parts, and thus give a great chance to the development and application of explicit symplectic integrators based on operator splitting and composing. However, such constructions cannot in general be available for curve... |
0912.5311 | Bernard Kelly | Bernard J. Kelly, Wolfgang Tichy, Yosef Zlochower, Manuela Campanelli,
Bernard Whiting | Post-Newtonian Initial Data with Waves: Progress in Evolution | 13 pages, 9 figures. Invited paper from Numerical Relativity and Data
Analysis (NRDA) 2009, Albert Einstein Institute, Potsdam. Corrected to match
published version. | Class.Quant.Grav.27:114005,2010 | 10.1088/0264-9381/27/11/114005 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In Kelly et al. [Phys. Rev. D, 76:024008, 2007], we presented new binary
black-hole initial data adapted to puncture evolutions in numerical relativity.
This data satisfies the constraint equations to 2.5 post-Newtonian order, and
contains a transverse-traceless "wavy" metric contribution, violating the
standard assu... | [
{
"created": "Tue, 29 Dec 2009 14:29:48 GMT",
"version": "v1"
},
{
"created": "Tue, 11 May 2010 15:50:47 GMT",
"version": "v2"
}
] | 2010-05-25 | [
[
"Kelly",
"Bernard J.",
""
],
[
"Tichy",
"Wolfgang",
""
],
[
"Zlochower",
"Yosef",
""
],
[
"Campanelli",
"Manuela",
""
],
[
"Whiting",
"Bernard",
""
]
] | In Kelly et al. [Phys. Rev. D, 76:024008, 2007], we presented new binary black-hole initial data adapted to puncture evolutions in numerical relativity. This data satisfies the constraint equations to 2.5 post-Newtonian order, and contains a transverse-traceless "wavy" metric contribution, violating the standard assump... |
1201.4790 | Jiri Podolsky | Jiri Podolsky, Robert Svarc | Interpreting spacetimes of any dimension using geodesic deviation | 19 pages, 2 figures. To appear in Phys. Rev. D. The reference [125]
added | Phys.Rev.D85:044057,2012 | 10.1103/PhysRevD.85.044057 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a general method which can be used for geometrical and physical
interpretation of an arbitrary spacetime in four or any higher number of
dimensions. It is based on the systematic analysis of relative motion of free
test particles. We demonstrate that local effect of the gravitational field on
particles, as... | [
{
"created": "Mon, 23 Jan 2012 18:10:24 GMT",
"version": "v1"
},
{
"created": "Fri, 27 Jan 2012 17:00:01 GMT",
"version": "v2"
}
] | 2015-06-03 | [
[
"Podolsky",
"Jiri",
""
],
[
"Svarc",
"Robert",
""
]
] | We present a general method which can be used for geometrical and physical interpretation of an arbitrary spacetime in four or any higher number of dimensions. It is based on the systematic analysis of relative motion of free test particles. We demonstrate that local effect of the gravitational field on particles, as d... |
1404.4792 | Stefano Vitale | Stefano Vitale, Giuseppe Congedo, Rita Dolesi, Valerio Ferroni, Mauro
Hueller, Daniele Vetrugno, William Joseph Weber, Heather Audley, Karsten
Danzmann, Ingo Diepholz, Martin Hewitson, Natalia Korsakova, Luigi Ferraioli,
Ferran Gibert, Nikolaos Karnesis, Miquel Nofrarias, Henri Inchauspe, Eric
Plagnol, Oliver J... | Data series subtraction with unknown and unmodeled background noise | To appear Phys. Rev. D90 August 2014 | Physical Review D 90, 042003 (2014) | 10.1103/PhysRevD.90.042003 | null | gr-qc astro-ph.IM | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | LISA Pathfinder (LPF), ESA's precursor mission to a gravitational wave
observatory, will measure the degree to which two test-masses can be put into
free-fall, aiming to demonstrate a residual relative acceleration with a power
spectral density (PSD) below 30 fm/s$^2$/Hz$^{1/2}$ around 1 mHz. In LPF data
analysis, th... | [
{
"created": "Fri, 18 Apr 2014 14:18:26 GMT",
"version": "v1"
},
{
"created": "Mon, 4 Aug 2014 14:42:30 GMT",
"version": "v2"
}
] | 2014-08-15 | [
[
"Vitale",
"Stefano",
""
],
[
"Congedo",
"Giuseppe",
""
],
[
"Dolesi",
"Rita",
""
],
[
"Ferroni",
"Valerio",
""
],
[
"Hueller",
"Mauro",
""
],
[
"Vetrugno",
"Daniele",
""
],
[
"Weber",
"William Joseph",
""
... | LISA Pathfinder (LPF), ESA's precursor mission to a gravitational wave observatory, will measure the degree to which two test-masses can be put into free-fall, aiming to demonstrate a residual relative acceleration with a power spectral density (PSD) below 30 fm/s$^2$/Hz$^{1/2}$ around 1 mHz. In LPF data analysis, the ... |
1012.3713 | Mercedes Martin-Benito | M Mart\'in-Benito, L J Garay, G A Mena Marug\'an | Quantum Gowdy model within the new loop quantum cosmology improved
dynamics | 4 pages, jpconf.cls, to appear in Proceedings of Spanish Relativity
Meeting 2010 (ERE 2010) held in Granada, Spain | null | 10.1088/1742-6596/314/1/012047 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The linearly polarized Gowdy $T^3$ model can be regarded as compact Bianchi I
cosmologies with inhomogeneous modes allowed to travel in one direction. We
study a hybrid quantization of this model that combines the loop quantization
of the Bianchi I background, adopting the improved dynamics scheme put forward
by Asht... | [
{
"created": "Thu, 16 Dec 2010 18:40:07 GMT",
"version": "v1"
}
] | 2015-05-20 | [
[
"Martín-Benito",
"M",
""
],
[
"Garay",
"L J",
""
],
[
"Marugán",
"G A Mena",
""
]
] | The linearly polarized Gowdy $T^3$ model can be regarded as compact Bianchi I cosmologies with inhomogeneous modes allowed to travel in one direction. We study a hybrid quantization of this model that combines the loop quantization of the Bianchi I background, adopting the improved dynamics scheme put forward by Ashtek... |
1708.02907 | R. E. Kastner | R. E. Kastner and S. Kauffman | Are Dark Energy and Dark Matter Different Aspects of the Same Physical
Process? | Some typos corrected. Comments welcome, pro or con | null | null | null | gr-qc quant-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | It is suggested that the apparently disparate cosmological phenomena
attributed to so-called 'dark matter' and 'dark energy' arise from the same
fundamental physical process: the emergence, from the quantum level, of
spacetime itself. This creation of spacetime results in metric expansion around
mass points in additi... | [
{
"created": "Wed, 9 Aug 2017 16:59:20 GMT",
"version": "v1"
},
{
"created": "Wed, 16 Aug 2017 23:50:04 GMT",
"version": "v2"
}
] | 2017-08-18 | [
[
"Kastner",
"R. E.",
""
],
[
"Kauffman",
"S.",
""
]
] | It is suggested that the apparently disparate cosmological phenomena attributed to so-called 'dark matter' and 'dark energy' arise from the same fundamental physical process: the emergence, from the quantum level, of spacetime itself. This creation of spacetime results in metric expansion around mass points in addition... |
0802.1398 | Parthasarathi Majumdar | Parthasarathi Majumdar | Holography, CFT and Black Hole Entropy | 17 pages Latex2e with 3 eps figures; based on invited lectures given
at the Platinum Jubilee International Conference on Theoretical Physics at
ISI, Kolkata, India, December 2007 and the International Conference on
Quantum Gauge Theories at the SNBNCBS, Kolkata, India, January 2008 | null | null | null | gr-qc | null | Aspects of holography or dimensional reduction in gravitational physics are
discussed with reference to black hole thermodynamics. Degrees of freedom
living on Isolated Horizons (as a model for macroscopic, generic, eternal black
hole horizons) are argued to be topological in nature and counted, using their
relation ... | [
{
"created": "Mon, 11 Feb 2008 10:05:29 GMT",
"version": "v1"
}
] | 2008-02-12 | [
[
"Majumdar",
"Parthasarathi",
""
]
] | Aspects of holography or dimensional reduction in gravitational physics are discussed with reference to black hole thermodynamics. Degrees of freedom living on Isolated Horizons (as a model for macroscopic, generic, eternal black hole horizons) are argued to be topological in nature and counted, using their relation to... |
1906.10735 | Laura Bernard | Laura Bernard | Dipolar tidal effects in scalar-tensor theories | 6 pages, v2: typos + errors in Eqs. (7), (8), (13)-(17) corrected | Phys. Rev. D 101, 021501 (2020) | 10.1103/PhysRevD.101.021501 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The inclusion of finite-size effects in the gravitational waveform templates
allows not only to constrain the internal structure of compact objects, but to
test deviations from general relativity. Here, we address the problem of tidal
effects in massless scalar-tensor theories. We introduce a new class of
scalar-type... | [
{
"created": "Tue, 25 Jun 2019 19:31:25 GMT",
"version": "v1"
},
{
"created": "Wed, 1 Mar 2023 10:30:58 GMT",
"version": "v2"
}
] | 2023-03-02 | [
[
"Bernard",
"Laura",
""
]
] | The inclusion of finite-size effects in the gravitational waveform templates allows not only to constrain the internal structure of compact objects, but to test deviations from general relativity. Here, we address the problem of tidal effects in massless scalar-tensor theories. We introduce a new class of scalar-type t... |
gr-qc/9607079 | Andrew Chamblin | A. Chamblin (Institute for Theoretical Physics, UCSB), G.W. Gibbons
(DAMTP, University of Cambridge) | Nucleating Black Holes via Non-Orientable Instantons | 27 pages LaTeX, minor typos are corrected | Phys.Rev.D55:2177-2185,1997 | 10.1103/PhysRevD.55.2177 | ITP-96-67, DAMTP R96/37 | gr-qc hep-th | null | We extend the analysis of black hole pair creation to include non- orientable
instantons. We classify these instantons in terms of their fundamental
symmetries and orientations. Many of these instantons admit the pin structure
which corresponds to the fermions actually observed in nature, and so the
natural objection... | [
{
"created": "Thu, 1 Aug 1996 01:00:57 GMT",
"version": "v1"
},
{
"created": "Mon, 5 Aug 1996 04:04:31 GMT",
"version": "v2"
}
] | 2009-10-07 | [
[
"Chamblin",
"A.",
"",
"Institute for Theoretical Physics, UCSB"
],
[
"Gibbons",
"G. W.",
"",
"DAMTP, University of Cambridge"
]
] | We extend the analysis of black hole pair creation to include non- orientable instantons. We classify these instantons in terms of their fundamental symmetries and orientations. Many of these instantons admit the pin structure which corresponds to the fermions actually observed in nature, and so the natural objection t... |
1511.09000 | Liberato Pizza | Elmo Benedetto, Antonio Feoli, Liberato Pizza | A trace of inflation in the local behavior of cosmological constant | 3 pages, 3 figures. Accepted for publication in Astrophysics and
Space Science (ASTR-D-15-00733) | null | 10.1007/s10509-015-2587-x | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Assuming the existence of a cosmological constant depending on time, we study
the evolution of this field in a local region of spacetime. Solving the
standard equations of Einstein Relativity in the weak field approximation we
find two asymptotes in the behavior of the cosmological constant. Their meaning
is the exis... | [
{
"created": "Sun, 29 Nov 2015 12:10:12 GMT",
"version": "v1"
}
] | 2015-12-09 | [
[
"Benedetto",
"Elmo",
""
],
[
"Feoli",
"Antonio",
""
],
[
"Pizza",
"Liberato",
""
]
] | Assuming the existence of a cosmological constant depending on time, we study the evolution of this field in a local region of spacetime. Solving the standard equations of Einstein Relativity in the weak field approximation we find two asymptotes in the behavior of the cosmological constant. Their meaning is the existe... |
1805.04718 | Roman Konoplya | R. A. Konoplya | How to tell the shape of a wormhole by its quasinormal modes | 8 pages, revtex4, 1 figure; version accepted for publication in
Physics Letters B | null | 10.1016/j.physletb.2018.07.025 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Here we shall show how to reconstruct the shape function of a spherically
symmetric traversable Lorenzian wormhole near its throat if one knows high
frequency quasinormal modes of the wormhole. The wormhole spacetime is given by
the Morris-Thorne ansatz. The solution to the inverse problem via fitting of
the paramete... | [
{
"created": "Sat, 12 May 2018 13:13:49 GMT",
"version": "v1"
},
{
"created": "Wed, 16 May 2018 11:34:45 GMT",
"version": "v2"
},
{
"created": "Wed, 11 Jul 2018 22:30:49 GMT",
"version": "v3"
}
] | 2018-07-25 | [
[
"Konoplya",
"R. A.",
""
]
] | Here we shall show how to reconstruct the shape function of a spherically symmetric traversable Lorenzian wormhole near its throat if one knows high frequency quasinormal modes of the wormhole. The wormhole spacetime is given by the Morris-Thorne ansatz. The solution to the inverse problem via fitting of the parameters... |
gr-qc/0105043 | Juan M. Aguirregabiria | J. M. Aguirregabiria and Ll. Bel | Extreme objects with arbitrary large mass, or density, and arbitrary
size | 20 pages, 6 figures. Fixed one reference. Added a new equation | Gen.Rel.Grav. 33 (2001) 2049-2074 | 10.1023/A:1013059228577 | null | gr-qc | null | We consider a generalization of the interior Schwarzschild solution that we
match to the exterior one to build global C^1 models that can have arbitrary
large mass, or density, with arbitrary size. This is possible because of a new
insight into the problem of localizing the center of symmetry of the models and
the us... | [
{
"created": "Mon, 14 May 2001 08:54:32 GMT",
"version": "v1"
},
{
"created": "Wed, 23 May 2001 08:39:59 GMT",
"version": "v2"
}
] | 2015-06-25 | [
[
"Aguirregabiria",
"J. M.",
""
],
[
"Bel",
"Ll.",
""
]
] | We consider a generalization of the interior Schwarzschild solution that we match to the exterior one to build global C^1 models that can have arbitrary large mass, or density, with arbitrary size. This is possible because of a new insight into the problem of localizing the center of symmetry of the models and the use ... |
0906.3690 | Leonardo Fernandez-Jambrina | F.J. Chinea, L. Fern\'andez-Jambrina | Surface densities in General Relativity | 7 pp., Proceedings of ERE'93 | Relativity in General, Eds: J. Diaz Alonso y M. Lorente Paramo.
Ed. Frontieres, Gif-sur-Yvette, France, 273-277 (1994) | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this lecture we deal with the construction of surface densities for the
angular momentum of the sources of asymptotically flat vacuum stationary
axisymmetric spacetimes. These sources arise from the discontinuities of the
twist potential. The result will be applied to the Kerr metric to obtain an
integrable densit... | [
{
"created": "Fri, 19 Jun 2009 19:16:47 GMT",
"version": "v1"
}
] | 2009-06-22 | [
[
"Chinea",
"F. J.",
""
],
[
"Fernández-Jambrina",
"L.",
""
]
] | In this lecture we deal with the construction of surface densities for the angular momentum of the sources of asymptotically flat vacuum stationary axisymmetric spacetimes. These sources arise from the discontinuities of the twist potential. The result will be applied to the Kerr metric to obtain an integrable density ... |
1012.4530 | Dipongkar Talukder | Dipongkar Talukder, Sanjit Mitra and Sukanta Bose | Multibaseline gravitational wave radiometry | 17 pages and 19 figures | Phys.Rev.D83:063002,2011 | 10.1103/PhysRevD.83.063002 | LIGO Document Number P1000123 | gr-qc astro-ph.CO hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We present a statistic for the detection of stochastic gravitational wave
backgrounds (SGWBs) using radiometry with a network of multiple baselines. We
also quantitatively compare the sensitivities of existing baselines and their
network to SGWBs. We assess how the measurement accuracy of signal parameters,
e.g., the... | [
{
"created": "Tue, 21 Dec 2010 02:03:03 GMT",
"version": "v1"
},
{
"created": "Tue, 22 Mar 2011 02:17:37 GMT",
"version": "v2"
}
] | 2015-03-17 | [
[
"Talukder",
"Dipongkar",
""
],
[
"Mitra",
"Sanjit",
""
],
[
"Bose",
"Sukanta",
""
]
] | We present a statistic for the detection of stochastic gravitational wave backgrounds (SGWBs) using radiometry with a network of multiple baselines. We also quantitatively compare the sensitivities of existing baselines and their network to SGWBs. We assess how the measurement accuracy of signal parameters, e.g., the s... |
2006.06461 | Timothy Anson | Timothy Anson, Eugeny Babichev, Christos Charmousis, Mokhtar Hassaine | Disforming the Kerr metric | 20 pages, 3 figures, v3: minor changes, matches published version | JHEP01(2021)018 | 10.1007/JHEP01(2021)018 | null | gr-qc astro-ph.HE hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Starting from a recently constructed stealth Kerr solution of higher order
scalar tensor theory involving scalar hair, we analytically construct disformal
versions of the Kerr spacetime with a constant degree of disformality and a
regular scalar field. While the disformed metric has only a ring singularity
and asympt... | [
{
"created": "Thu, 11 Jun 2020 14:14:52 GMT",
"version": "v1"
},
{
"created": "Fri, 26 Jun 2020 15:11:34 GMT",
"version": "v2"
},
{
"created": "Wed, 6 Jan 2021 11:35:01 GMT",
"version": "v3"
}
] | 2021-01-07 | [
[
"Anson",
"Timothy",
""
],
[
"Babichev",
"Eugeny",
""
],
[
"Charmousis",
"Christos",
""
],
[
"Hassaine",
"Mokhtar",
""
]
] | Starting from a recently constructed stealth Kerr solution of higher order scalar tensor theory involving scalar hair, we analytically construct disformal versions of the Kerr spacetime with a constant degree of disformality and a regular scalar field. While the disformed metric has only a ring singularity and asymptot... |
2407.06009 | Lodovico Capuano | Lodovico Capuano, Luca Santoni, Enrico Barausse | Perturbations of the Vaidya metric in the frequency domain: Quasi-normal
modes and tidal response | 19 pages, 4 figures | null | null | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The mass of a black hole can dynamically evolve due to various physical
processes, such as for instance accretion, Hawking radiation, absorption of
gravitational/electromagnetic waves, superradiance, etc. This evolution can
have an impact on astrophysical observables, like the ringdown gravitational
signal. An effect... | [
{
"created": "Mon, 8 Jul 2024 15:00:48 GMT",
"version": "v1"
}
] | 2024-07-09 | [
[
"Capuano",
"Lodovico",
""
],
[
"Santoni",
"Luca",
""
],
[
"Barausse",
"Enrico",
""
]
] | The mass of a black hole can dynamically evolve due to various physical processes, such as for instance accretion, Hawking radiation, absorption of gravitational/electromagnetic waves, superradiance, etc. This evolution can have an impact on astrophysical observables, like the ringdown gravitational signal. An effectiv... |
2102.05881 | Jinsong Yang | Jinsong Yang, Cong Zhang, Yongge Ma | Relating spin-foam to canonical loop quantum gravity by graphical
calculus | 19 pages | Phys. Rev. D 104, 044025 (2021) | 10.1103/PhysRevD.104.044025 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The graphical calculus method is generalized to study the relation between
covariant and canonical dynamics of loop quantum gravity. On one hand, a
graphical derivation of the partition function of the generalized Euclidean
Engle-Pereira-Rovelli-Livine (EPRL) spin-foam model is presented. On the other
hand, the actio... | [
{
"created": "Thu, 11 Feb 2021 08:00:42 GMT",
"version": "v1"
},
{
"created": "Fri, 19 Feb 2021 11:24:11 GMT",
"version": "v2"
},
{
"created": "Sat, 14 Aug 2021 06:58:51 GMT",
"version": "v3"
}
] | 2021-08-17 | [
[
"Yang",
"Jinsong",
""
],
[
"Zhang",
"Cong",
""
],
[
"Ma",
"Yongge",
""
]
] | The graphical calculus method is generalized to study the relation between covariant and canonical dynamics of loop quantum gravity. On one hand, a graphical derivation of the partition function of the generalized Euclidean Engle-Pereira-Rovelli-Livine (EPRL) spin-foam model is presented. On the other hand, the action ... |
1302.1014 | Jian-Yang Zhu | Xiao-Jun Yue and Jian-Yang Zhu | Loop Quantum Cosmology of Bianchi I Model in $\bar{\mu}$ and
$\bar{\mu}'$ Schemes with Higher Order Holonomy Corrections | 16 pages, 3 figures | Class. Quantum Grav. 31 (2014) 045008 | 10.1088/0264-9381/31/4/045008 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | The detailed formulation of loop quantum cosmology with higher order holonomy
corrections has been constructed recently in the homogeneous and isotropic
spacetime, yet it is important to extend the higher order holonomy corrections
to include the effects of anisotropy which typically grow during the collapsing
phase.... | [
{
"created": "Tue, 5 Feb 2013 12:39:33 GMT",
"version": "v1"
},
{
"created": "Fri, 31 Jan 2014 17:09:51 GMT",
"version": "v2"
}
] | 2015-06-12 | [
[
"Yue",
"Xiao-Jun",
""
],
[
"Zhu",
"Jian-Yang",
""
]
] | The detailed formulation of loop quantum cosmology with higher order holonomy corrections has been constructed recently in the homogeneous and isotropic spacetime, yet it is important to extend the higher order holonomy corrections to include the effects of anisotropy which typically grow during the collapsing phase. I... |
1811.07500 | Vladimir Folomeev | Vladimir Dzhunushaliev, Vladimir Folomeev | Dirac stars supported by nonlinear spinor fields | 8 pages, 4 figures, minor corrections to content, new reference
added, version published in PRD | Phys. Rev. D 99, 084030 (2019) | 10.1103/PhysRevD.99.084030 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We study configurations consisting of a gravitating spinor field $\psi$ with
a nonlinearity of the type $\lambda\left(\bar\psi\psi\right)^2$. To ensure
spherical symmetry of the configurations, we use two spin-$\frac{1}{2}$ fields
forming a spin singlet. For such systems, we find regular stationary
asymptotically fla... | [
{
"created": "Mon, 19 Nov 2018 04:58:53 GMT",
"version": "v1"
},
{
"created": "Thu, 18 Apr 2019 04:30:07 GMT",
"version": "v2"
}
] | 2019-04-19 | [
[
"Dzhunushaliev",
"Vladimir",
""
],
[
"Folomeev",
"Vladimir",
""
]
] | We study configurations consisting of a gravitating spinor field $\psi$ with a nonlinearity of the type $\lambda\left(\bar\psi\psi\right)^2$. To ensure spherical symmetry of the configurations, we use two spin-$\frac{1}{2}$ fields forming a spin singlet. For such systems, we find regular stationary asymptotically flat ... |
2108.10276 | Sergey Yu. Vernov | Vsevolod R. Ivanov and Sergey Yu. Vernov | Integrable modified gravity cosmological models with an additional
scalar field | 11 pages, 3 figures, v2: minor corrections, references are added, to
appear in EPJC | Eur. Phys. J. C 81 (2021) 985 | 10.1140/epjc/s10052-021-09792-4 | null | gr-qc astro-ph.CO math-ph math.MP | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider modified gravity cosmological models that can be transformed into
two-field chiral cosmological models by the conformal metric transformation.
For the $R^2$ gravity model with an additional scalar field and the
corresponding two-field model with the cosmological constant and nonstandard
kinetic part of th... | [
{
"created": "Mon, 23 Aug 2021 16:27:25 GMT",
"version": "v1"
},
{
"created": "Sun, 31 Oct 2021 19:07:26 GMT",
"version": "v2"
}
] | 2021-11-11 | [
[
"Ivanov",
"Vsevolod R.",
""
],
[
"Vernov",
"Sergey Yu.",
""
]
] | We consider modified gravity cosmological models that can be transformed into two-field chiral cosmological models by the conformal metric transformation. For the $R^2$ gravity model with an additional scalar field and the corresponding two-field model with the cosmological constant and nonstandard kinetic part of the ... |
2305.19057 | Yongqiang Wang | X. E. Wang | From Bardeen-boson stars to black holes without event horizon | 10 pages, 3 figures | null | null | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In a talk given in 2013, S. Hawking conjectured that the event horizon of
black holes does not exist and suggested redefining black holes as bound states
of the gravitational field. Inspired by this idea, we investigated the coupling
of the Bardeen action and a complex scalar field model. Numerically, we
obtained a c... | [
{
"created": "Tue, 30 May 2023 14:19:29 GMT",
"version": "v1"
}
] | 2023-05-31 | [
[
"Wang",
"X. E.",
""
]
] | In a talk given in 2013, S. Hawking conjectured that the event horizon of black holes does not exist and suggested redefining black holes as bound states of the gravitational field. Inspired by this idea, we investigated the coupling of the Bardeen action and a complex scalar field model. Numerically, we obtained a cla... |
2112.04347 | Masum Murshid | Masum Murshid, Nilofar Rahman, Irina Radinschi and Mehedi Kalam | Analytical model of low mass strange stars in 2+1 spacetime | null | null | null | null | gr-qc | http://creativecommons.org/publicdomain/zero/1.0/ | The low mass compact stars are quite fascinating objects to study for their
enigmatic behaviour. In this paper, we have modeled this kind of low mass
strange stars based on the Heintzmann ansatz (H. Heintzmann., Zeitschrift f\"ur
Physik, vol.228, 489, 1969.) in $(2+1)$ dimension. Attractive anisotropic force
plays a ... | [
{
"created": "Wed, 8 Dec 2021 15:55:04 GMT",
"version": "v1"
}
] | 2021-12-09 | [
[
"Murshid",
"Masum",
""
],
[
"Rahman",
"Nilofar",
""
],
[
"Radinschi",
"Irina",
""
],
[
"Kalam",
"Mehedi",
""
]
] | The low mass compact stars are quite fascinating objects to study for their enigmatic behaviour. In this paper, we have modeled this kind of low mass strange stars based on the Heintzmann ansatz (H. Heintzmann., Zeitschrift f\"ur Physik, vol.228, 489, 1969.) in $(2+1)$ dimension. Attractive anisotropic force plays a si... |
gr-qc/9311024 | Sakai | Nobuyuki Sakai and Kei-ichi Maeda | Junction Conditions of Friedmann-Robertson-Walker Space-Times | 7 pages, LaTeX, figures are not included (available on request by
regular mail), WU-AP/31/93 | Phys.Rev.D50:5425-5428,1994 | 10.1103/PhysRevD.50.5425 | null | gr-qc | null | We complete a classification of junctions of two Friedmann-Robertson-Walker
space-times bounded by a spherical thin wall. Our analysis covers super-horizon
bubbles and thus complements the previous work of Berezin, Kuzumin and Tkachev.
Contrary to sub-horizon bubbles, various topology types for super-horizon
bubbles ... | [
{
"created": "Mon, 15 Nov 1993 10:41:52 GMT",
"version": "v1"
},
{
"created": "Thu, 4 Aug 1994 14:23:03 GMT",
"version": "v2"
}
] | 2010-11-01 | [
[
"Sakai",
"Nobuyuki",
""
],
[
"Maeda",
"Kei-ichi",
""
]
] | We complete a classification of junctions of two Friedmann-Robertson-Walker space-times bounded by a spherical thin wall. Our analysis covers super-horizon bubbles and thus complements the previous work of Berezin, Kuzumin and Tkachev. Contrary to sub-horizon bubbles, various topology types for super-horizon bubbles ar... |
gr-qc/0102113 | Brandon Carter | B. Carter | Interaction of gravitational waves with an elastic solid medium | 14 pages TeX file of contrib. to proc. Gravitational Radiation, Les
Houches 1982, ed N. Deruelle, T. Piran, 455-464 (North Holland, Amsterdam,
1983) | null | null | null | gr-qc | null | Contents. 1. Introduction. 2. Kinematics of a Material Medium: Material
Representation. 3. Kinematics of a Material Medium: Convected Differentials. 4.
Kinematics of a Perfect Elastic Medium. 5. Small Gravitational Perturbations of
an Elastic Medium.
| [
{
"created": "Wed, 28 Feb 2001 16:02:19 GMT",
"version": "v1"
}
] | 2007-05-23 | [
[
"Carter",
"B.",
""
]
] | Contents. 1. Introduction. 2. Kinematics of a Material Medium: Material Representation. 3. Kinematics of a Material Medium: Convected Differentials. 4. Kinematics of a Perfect Elastic Medium. 5. Small Gravitational Perturbations of an Elastic Medium. |
gr-qc/0509110 | Tiberiu Harko | C. G. Boehmer, T. Harko | Does the cosmological constant imply the existence of a minimum mass? | 8 pages, no figures, accepted for publication in PLB | Phys.Lett. B630 (2005) 73-77 | 10.1016/j.physletb.2005.09.071 | Preprint ESI 1712, TUW-05-14 | gr-qc astro-ph hep-th | null | We show that in the framework of the classical general relativity the
presence of a positive cosmological constant implies the existence of a minimal
mass and of a minimal density in nature. These results rigorously follow from
the generalized Buchdahl inequality in the presence of a cosmological constant.
| [
{
"created": "Wed, 28 Sep 2005 02:04:14 GMT",
"version": "v1"
},
{
"created": "Wed, 5 Oct 2005 18:13:52 GMT",
"version": "v2"
}
] | 2007-05-23 | [
[
"Boehmer",
"C. G.",
""
],
[
"Harko",
"T.",
""
]
] | We show that in the framework of the classical general relativity the presence of a positive cosmological constant implies the existence of a minimal mass and of a minimal density in nature. These results rigorously follow from the generalized Buchdahl inequality in the presence of a cosmological constant. |
1909.05154 | Susobhan Mandal | Susobhan Mandal | Existence of conserved quantities and their algebra in curved spacetime | 19 pages. Typos are corrected and title is changed | null | 10.1142/S0217751X20501626 | null | gr-qc | http://creativecommons.org/licenses/by/4.0/ | In General Relativity, finding out the geodesics of a given spacetime
manifold is an important task because it determines which classical processes
are dynamically forbidden. Conserved quantities play an important role in
solving geodesic equations of a general spacetime manifold. Furthermore,
knowing all possible co... | [
{
"created": "Mon, 8 Jul 2019 11:44:15 GMT",
"version": "v1"
},
{
"created": "Thu, 12 Sep 2019 06:10:09 GMT",
"version": "v2"
},
{
"created": "Thu, 4 Jun 2020 08:55:22 GMT",
"version": "v3"
}
] | 2020-09-24 | [
[
"Mandal",
"Susobhan",
""
]
] | In General Relativity, finding out the geodesics of a given spacetime manifold is an important task because it determines which classical processes are dynamically forbidden. Conserved quantities play an important role in solving geodesic equations of a general spacetime manifold. Furthermore, knowing all possible cons... |
2004.06102 | Simone Mastrogiovanni | S. Mastrogiovanni, D. A. Steer, M. Barsuglia | Joint tests of cosmology and modified gravity in light of GW170817 | This paper has been merged with 2004.01632 | null | null | null | gr-qc astro-ph.CO | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | In this Letter we constrain for the first time both cosmology and modified
gravity theories conjointly, by combining the GW and electromagnetic
observations of GW170817. We provide joint posterior distributions for the
Hubble constant $H_0$, and two physical effects typical of modified gravity:
the gravitational wave... | [
{
"created": "Mon, 13 Apr 2020 17:59:30 GMT",
"version": "v1"
},
{
"created": "Tue, 21 Apr 2020 10:40:52 GMT",
"version": "v2"
},
{
"created": "Wed, 12 Aug 2020 18:16:49 GMT",
"version": "v3"
}
] | 2020-08-14 | [
[
"Mastrogiovanni",
"S.",
""
],
[
"Steer",
"D. A.",
""
],
[
"Barsuglia",
"M.",
""
]
] | In this Letter we constrain for the first time both cosmology and modified gravity theories conjointly, by combining the GW and electromagnetic observations of GW170817. We provide joint posterior distributions for the Hubble constant $H_0$, and two physical effects typical of modified gravity: the gravitational wave (... |
gr-qc/9308020 | null | J.J.Halliwell and M.E.Ortiz | Quantum mechanical composition laws in reparameterization invariant
systems | 5 pages | Int.J.Mod.Phys.D3:195-198,1994 | 10.1142/S0218271894000277 | null | gr-qc hep-th | null | This paper gives a brief description of the derivation of a composition law
for the propagator of a relativistic particle, in a sum over histories
quantization. The extension of this derivation to the problem of finding a
composition law for quantum cosmology is also discussed. (For the proceedings
of Journees Relati... | [
{
"created": "Fri, 20 Aug 1993 17:06:36 GMT",
"version": "v1"
}
] | 2011-04-15 | [
[
"Halliwell",
"J. J.",
""
],
[
"Ortiz",
"M. E.",
""
]
] | This paper gives a brief description of the derivation of a composition law for the propagator of a relativistic particle, in a sum over histories quantization. The extension of this derivation to the problem of finding a composition law for quantum cosmology is also discussed. (For the proceedings of Journees Relativi... |
1103.3554 | Hossein Farajollahi | H. Farajollahi, A. Ravanpak, G. F. Fadakar | The universe dynamics in the tachyon cosmology with non-minimal coupling
to matter | 14 pages, 11 figures | Mod. Phys. Lett. A, Vol. 26, No. 15 (2011) pp. 1125-1135 | 10.1142/S0217732311035523 | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Recently, the tachyon cosmology has been represented as dark energy model to
support the current acceleration of the universe without phantom crossing. In
this paper, we study the dynamics of the tachyon cosmology in which the field
plays the role of tachyon field and also non--minimally coupled to the matter
lagrang... | [
{
"created": "Fri, 18 Mar 2011 05:06:55 GMT",
"version": "v1"
},
{
"created": "Wed, 8 Jun 2011 07:00:49 GMT",
"version": "v2"
}
] | 2015-05-27 | [
[
"Farajollahi",
"H.",
""
],
[
"Ravanpak",
"A.",
""
],
[
"Fadakar",
"G. F.",
""
]
] | Recently, the tachyon cosmology has been represented as dark energy model to support the current acceleration of the universe without phantom crossing. In this paper, we study the dynamics of the tachyon cosmology in which the field plays the role of tachyon field and also non--minimally coupled to the matter lagrangia... |
1501.03968 | Apostolos Kuiroukidis | I. G. Contopoulos, F. P. Esposito, K. Kleidis, D. B. Papadopoulos, and
L. Witten | Generating Solutions to the Einstein Field Equations | 16 pages; submitted to IJMP D | null | 10.1142/S021827181650022X | null | gr-qc | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | Exact solutions to the Einstein field equations may be generated from already
existing ones (seed solutions), that admit at least one Killing vector. In this
framework, a space of potentials is introduced. By the use of symmetries in
this space, the set of potentials associated to a known solution are
transformed int... | [
{
"created": "Fri, 16 Jan 2015 12:56:37 GMT",
"version": "v1"
},
{
"created": "Mon, 6 Apr 2015 08:39:23 GMT",
"version": "v2"
},
{
"created": "Fri, 7 Aug 2015 17:33:48 GMT",
"version": "v3"
}
] | 2016-03-16 | [
[
"Contopoulos",
"I. G.",
""
],
[
"Esposito",
"F. P.",
""
],
[
"Kleidis",
"K.",
""
],
[
"Papadopoulos",
"D. B.",
""
],
[
"Witten",
"L.",
""
]
] | Exact solutions to the Einstein field equations may be generated from already existing ones (seed solutions), that admit at least one Killing vector. In this framework, a space of potentials is introduced. By the use of symmetries in this space, the set of potentials associated to a known solution are transformed into ... |
gr-qc/9910021 | Maria Emilia | C. N. Ferreira (Depto. Campos e Particulas, CBPF), M. E. X. Guimaraes
(Depto. de Matematica, UnB) and J. A. Helayel-Neto (Depto. de Campos e
Particulas, CBPF and UCP) | Dilatonic, Current-Carrying Cosmic String | 12 pp, Latex, no figures, based on a talk given by M. E. X. Guimaraes
at the COSMO 99, 27/9 to 02/10/99, ICTP, Trieste, It | null | 10.1142/9789812792129_0038 | null | gr-qc hep-th | null | We study the implications of a scalar-tensorial gravity for the metric of an
isolated self-gravitating superconducting cosmic string. These modifications
are induced by an arbitrary coupling of a massless scalar field to the usual
tensorial field in the gravitational Lagrangian. We derive the metric in the
weak-field... | [
{
"created": "Wed, 6 Oct 1999 15:59:16 GMT",
"version": "v1"
}
] | 2016-11-03 | [
[
"Ferreira",
"C. N.",
"",
"Depto. Campos e Particulas, CBPF"
],
[
"Guimaraes",
"M. E. X.",
"",
"Depto. de Matematica, UnB"
],
[
"Helayel-Neto",
"J. A.",
"",
"Depto. de Campos e\n Particulas, CBPF and UCP"
]
] | We study the implications of a scalar-tensorial gravity for the metric of an isolated self-gravitating superconducting cosmic string. These modifications are induced by an arbitrary coupling of a massless scalar field to the usual tensorial field in the gravitational Lagrangian. We derive the metric in the weak-field a... |
2105.05039 | Emil Akhmedov | E.T.Akhmedov (MIPT and ITEP) | Curved space equilibration vs. flat space thermalization (a short
review) | 15 pages | null | 10.1142/S0217732321300202 | null | gr-qc hep-th | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We discuss equilibration process in expanding universes as compared to the
thermalization process in Minkowski space--time. The final goal is to answer
the following question: Is the equilibrium reached before the rapid expansion
stops and quantum effects have a negligible effect on the background geometry
or stress-... | [
{
"created": "Sun, 9 May 2021 14:50:41 GMT",
"version": "v1"
}
] | 2021-07-21 | [
[
"Akhmedov",
"E. T.",
"",
"MIPT and ITEP"
]
] | We discuss equilibration process in expanding universes as compared to the thermalization process in Minkowski space--time. The final goal is to answer the following question: Is the equilibrium reached before the rapid expansion stops and quantum effects have a negligible effect on the background geometry or stress--e... |
1008.0971 | A. Tawfik | A. Tawfik (Egyptian Ctr. Theor. Phys., Cairo), M. Wahba (Egyptian Ctr.
Theor. Phys., Cairo), H. Mansour (Cairo U.) and T. Harko (Hong Kong U.) | Hubble Parameter in QCD Universe for finite Bulk Viscosity | 9 pages (revtex4 style), 5 figures with 8 eps graphs | Annalen Phys.522:912-923,2010 | 10.1002/andp.201000103 | ECTP-2010-07 | gr-qc astro-ph.CO hep-ph | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ | We consider the influence of the perturbative bulk viscosity on the evolution
of the Hubble parameter in the QCD era of the early Universe. For the geometry
of the Universe we assume the homogeneous and isotropic
Friedmann-Lemaitre-Robertson-Walker metric, while the background matter is
assumed to be characterized by... | [
{
"created": "Thu, 5 Aug 2010 13:41:36 GMT",
"version": "v1"
},
{
"created": "Mon, 27 Sep 2010 14:19:09 GMT",
"version": "v2"
}
] | 2010-11-24 | [
[
"Tawfik",
"A.",
"",
"Egyptian Ctr. Theor. Phys., Cairo"
],
[
"Wahba",
"M.",
"",
"Egyptian Ctr.\n Theor. Phys., Cairo"
],
[
"Mansour",
"H.",
"",
"Cairo U."
],
[
"Harko",
"T.",
"",
"Hong Kong U."
]
] | We consider the influence of the perturbative bulk viscosity on the evolution of the Hubble parameter in the QCD era of the early Universe. For the geometry of the Universe we assume the homogeneous and isotropic Friedmann-Lemaitre-Robertson-Walker metric, while the background matter is assumed to be characterized by b... |
gr-qc/9303002 | Tevian Dray | Tevian Dray, Corinne A. Manogue, and Robin W. Tucker | The Scalar Field Equation in the Presence of Signature Change | requires REVTeX 2.0 or 3.0 (Plain TeX version available on request),
4 pages by default (12 in preprint style), no figures | Phys.Rev. D48 (1993) 2587-2590 | 10.1103/PhysRevD.48.2587 | null | gr-qc hep-th | null | We consider the (massless) scalar field on a 2-dimensional manifold with
metric that changes signature from Lorentzian to Euclidean. Requiring a
conserved momentum in the spatially homogeneous case leads to a particular
choice of propagation rule. The resulting mix of positive and negative
frequencies depends only on... | [
{
"created": "Mon, 1 Mar 1993 22:45:16 GMT",
"version": "v1"
}
] | 2016-08-31 | [
[
"Dray",
"Tevian",
""
],
[
"Manogue",
"Corinne A.",
""
],
[
"Tucker",
"Robin W.",
""
]
] | We consider the (massless) scalar field on a 2-dimensional manifold with metric that changes signature from Lorentzian to Euclidean. Requiring a conserved momentum in the spatially homogeneous case leads to a particular choice of propagation rule. The resulting mix of positive and negative frequencies depends only on t... |
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